Remove orphaned comments and tidy ScriptExpr/ScriptCmd enums

Co-Authored-By: Claude Opus 4.8 <[email protected]>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,10 +0,0 @@
----
-name: Bug report
-about: Create a report to help us improve
-title: ''
-labels: ''
-assignees: ''
-
----
-
-Delete this message and describe the bug here. Note that we only fix bugs in the most recent release of mold, so please make sure that you are using the most recent version.

.github/workflows/build-all.yml

@@ -0,0 +1,93 @@
+name: Build all tarballs
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+
+jobs:
+  check-changes:
+    runs-on: ubuntu-24.04
+    outputs:
+      has_changes: ${{ github.event_name == 'workflow_dispatch' || steps.check.outputs.has_changes }}
+    steps:
+    - name: Check for new commits since last successful run
+      id: check
+      env:
+        GH_TOKEN: ${{ github.token }}
+      run: |
+        last=$(gh run list -R ${{ github.repository }} -w build-all.yml -b main -s success -L1 --json createdAt -q '.[0].createdAt')
+        if [ -z "$last" ] || [ "$last" = "null" ] || [ "$(gh api repos/${{ github.repository }}/commits?sha=main\&since=$last\&per_page=1 | jq length)" -gt 0 ]; then
+          echo "has_changes=true" >> "$GITHUB_OUTPUT"
+        fi
+
+  build-linux:
+    needs: check-changes
+    if: needs.check-changes.outputs.has_changes == 'true'
+    strategy:
+      matrix:
+        include:
+          - { target: x86_64,      os: ubuntu-24.04 }
+          - { target: aarch64,     os: ubuntu-24.04-arm }
+          - { target: arm,         os: ubuntu-24.04-arm }
+          - { target: riscv64,     os: ubuntu-24.04 }
+          - { target: ppc64le,     os: ubuntu-24.04 }
+          - { target: s390x,       os: ubuntu-24.04 }
+          - { target: loongarch64, os: ubuntu-24.04 }
+
+    runs-on: ${{ matrix.os }}
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v6
+
+    - name: Install Podman
+      run: sudo apt-get update && sudo apt-get install -y podman qemu-user-static
+
+    - name: Login to GitHub Container Registry
+      uses: redhat-actions/podman-login@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Build a tarball
+      run: ./dist.sh ${{ matrix.target }}
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v7
+      with:
+        name: ${{ matrix.target }}
+        path: dist/mold-*.tar.gz
+        compression-level: 0
+
+  build-windows:
+    needs: check-changes
+    if: needs.check-changes.outputs.has_changes == 'true'
+    runs-on: windows-latest
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v6
+
+    - name: Build and Archive
+      shell: pwsh
+      run: |
+        mkdir build
+        cd build
+        cmake -T clangcl ..
+        cmake --build . --config Release -j $Env:NUMBER_OF_PROCESSORS
+        cmake --install . --config Release --prefix ../mold-install
+        cd ..
+        New-Item -ItemType Directory -Force dist | Out-Null
+        $version = $Env:TAG -replace '^v', ''
+        Compress-Archive -Path mold-install\* -DestinationPath dist\mold-$version-windows-x86_64.zip
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v7
+      with:
+        name: win-x86_64
+        path: dist/mold-*.*

.github/workflows/build-native.yml

@@ -0,0 +1,44 @@
+name: Build native tarballs
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  build-tarballs:
+    strategy:
+      matrix:
+        include:
+          - { target: x86_64,  os: ubuntu-24.04 }
+          - { target: aarch64, os: ubuntu-24.04-arm }
+          - { target: arm,     os: ubuntu-24.04-arm }
+
+    runs-on: ${{ matrix.os }}
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v6
+
+    - name: Install Podman
+      run: sudo apt-get update && sudo apt-get install -y podman qemu-user-static
+
+    - name: Login to GitHub Container Registry
+      uses: redhat-actions/podman-login@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Build a tarball
+      run: ./dist.sh ${{ matrix.target }}
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v7
+      with:
+        name: ${{ matrix.target }}
+        path: dist/mold-*.tar.gz
+        compression-level: 0

.github/workflows/ci.yml

@@ -1,157 +1,172 @@
 name: CI
 on:
   push:
-    branches: [ main ]
   pull_request:
-    branches: [ main ]
 env:
   UBSAN_OPTIONS: print_stacktrace=1:halt_on_error=1
-  MOLD_SUPPRESS_MACHO_WARNING: 1
 jobs:
-  build-clang-make:
-    strategy:
-      matrix:
-        target:
-        - test
-        - test-asan
-        - test-tsan
-    runs-on: ubuntu-20.04
-    steps:
-    - uses: actions/checkout@v2
-    - uses: rui314/setup-mold@staging
-    - name: install-build-deps
-      run: sudo apt-get update && sudo ./install-build-deps.sh
-    - name: ccache
-      uses: hendrikmuhs/ccache-action@v1
-    - name: make test
-      run: |
-        echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
-        make -j$(nproc) CC=clang CXX=clang++ ${{ matrix.target }}
-
-  build-clang-cmake:
+  build-asan-tsan:
     strategy:
       matrix:
         target:
         - ''
         - '-DMOLD_USE_ASAN=On'
         - '-DMOLD_USE_TSAN=On'
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
+    timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - uses: rui314/setup-mold@staging
-    - name: install-build-deps
-      run: sudo apt-get update && sudo ./install-build-deps.sh
-    - name: ccache
-      uses: hendrikmuhs/ccache-action@v1
-    - name: build and test
+    - run: sudo ./install-build-deps.sh
+    - name: build
       run: |
-        echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
+        sudo apt-get install -y clang-18 clang gcc-multilib gdb dwarfdump zstd
         mkdir build
         cd build
-        cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ ${{ matrix.target }} ..
+        cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_COMPILER=clang-18 -DCMAKE_CXX_COMPILER=clang++-18 ${{ matrix.target }} ..
         cmake --build . -j$(nproc)
-        ctest . -j$(nproc)
+    - run: cd build; ctest --output-on-failure -j$(nproc)
+    - name: archive test results
+      uses: actions/upload-artifact@v7
+      if: failure()
+      with:
+        name: test-results-clang
+        path: |
+          build
+          !build/CMakeFiles
 
-  build-gcc-make:
-    runs-on: ubuntu-20.04
-    container: gcc:11.1.0
+  build-msan:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
+    - uses: redhat-actions/podman-login@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - run: .github/workflows/run-msan.sh
+
+  build-multi-archs:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 60
+    steps:
+    - uses: actions/checkout@v6
     - name: install-build-deps
       run: |
-        dpkg --add-architecture i386
-        apt-get update
-        ./install-build-deps.sh
-        apt-get install -y sudo qemu-user gcc-10-i686-linux-gnu gcc-10-aarch64-linux-gnu gcc-10-riscv64-linux-gnu gcc-10-arm-linux-gnueabihf g++-10-i686-linux-gnu g++-10-aarch64-linux-gnu g++-10-riscv64-linux-gnu g++-10-arm-linux-gnueabihf
-        ln -sf /usr/bin/i686-linux-gnu-gcc-10 /usr/bin/i686-linux-gnu-gcc
-        ln -sf /usr/bin/i686-linux-gnu-g++-10 /usr/bin/i686-linux-gnu-g++
-        ln -sf /usr/bin/aarch64-linux-gnu-gcc-10 /usr/bin/aarch64-linux-gnu-gcc
-        ln -sf /usr/bin/aarch64-linux-gnu-g++-10 /usr/bin/aarch64-linux-gnu-g++
-        ln -sf /usr/bin/arm-linux-gnueabihf-gcc-10 /usr/bin/arm-linux-gnueabihf-gcc
-        ln -sf /usr/bin/arm-linux-gnueabihf-g++-10 /usr/bin/arm-linux-gnueabihf-g++
-        ln -sf /usr/bin/riscv64-linux-gnu-gcc-10 /usr/bin/riscv64-linux-gnu-gcc
-        ln -sf /usr/bin/riscv64-linux-gnu-g++-10 /usr/bin/riscv64-linux-gnu-g++
-    - name: ccache
-      uses: hendrikmuhs/ccache-action@v1
-    - name: make test-all
+        sudo ./install-build-deps.sh
+        sudo ./install-cross-tools.sh
+        sudo .github/workflows/install-extras.sh
+    - name: build
       run: |
-        echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
-        make -j$(nproc) CC=gcc CXX=g++ test-all
-
-  build-gcc-cmake:
-    runs-on: ubuntu-20.04
-    container: gcc:11.1.0
-    steps:
-    - uses: actions/checkout@v2
-    - name: install-build-deps
-      run: |
-        dpkg --add-architecture i386
-        apt-get update
-        ./install-build-deps.sh
-        apt-get install -y sudo qemu-user gcc-10-i686-linux-gnu gcc-10-aarch64-linux-gnu gcc-10-riscv64-linux-gnu gcc-10-arm-linux-gnueabihf g++-10-i686-linux-gnu g++-10-aarch64-linux-gnu g++-10-riscv64-linux-gnu g++-10-arm-linux-gnueabihf
-        ln -sf /usr/bin/i686-linux-gnu-gcc-10 /usr/bin/i686-linux-gnu-gcc
-        ln -sf /usr/bin/i686-linux-gnu-g++-10 /usr/bin/i686-linux-gnu-g++
-        ln -sf /usr/bin/aarch64-linux-gnu-gcc-10 /usr/bin/aarch64-linux-gnu-gcc
-        ln -sf /usr/bin/aarch64-linux-gnu-g++-10 /usr/bin/aarch64-linux-gnu-g++
-        ln -sf /usr/bin/arm-linux-gnueabihf-gcc-10 /usr/bin/arm-linux-gnueabihf-gcc
-        ln -sf /usr/bin/arm-linux-gnueabihf-g++-10 /usr/bin/arm-linux-gnueabihf-g++
-        ln -sf /usr/bin/riscv64-linux-gnu-gcc-10 /usr/bin/riscv64-linux-gnu-gcc
-        ln -sf /usr/bin/riscv64-linux-gnu-g++-10 /usr/bin/riscv64-linux-gnu-g++
-    - name: ccache
-      uses: hendrikmuhs/ccache-action@v1
-    - name: build and test
-      run: |
-        echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
         mkdir build
         cd build
-        cmake -DMOLD_ENABLE_QEMU_TESTS=On ..
+        cmake ..
         cmake --build . -j$(nproc)
-        ctest . -j$(nproc)
+    - run: cd build; ctest --output-on-failure -j$(nproc)
+    - name: archive test results
+      uses: actions/upload-artifact@v7
+      if: failure()
+      with:
+        name: test-results-multi-archs
+        path: |
+          build
+          !build/CMakeFiles
 
-  build-macos-make:
+  build-distros:
     strategy:
       matrix:
-        target:
-        - test
-        - test-asan
-    runs-on: macos-11
+        distro:
+        - alpine
+        - archlinux
+        - debian:11 # GCC 10 and CMake 3.18 - the minimum supported by mold
+        - fedora
+        - gentoo/stage3
+        - opensuse/tumbleweed
+        - ubuntu:22.04
+        - ubuntu:25.04
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    container: ${{ matrix.distro }}
     steps:
-    - uses: actions/checkout@v2
-    - uses: rui314/setup-mold@staging
-    - name: ccache
-      uses: hendrikmuhs/ccache-action@v1
-    - name: make test
+    - uses: actions/checkout@v6
+    - run: ./install-build-deps.sh
+    - name: build
       run: |
-        echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
-        make -j$(sysctl -n hw.logicalcpu) ${{ matrix.target }}
-
-  build-macos-cmake:
-    runs-on: macos-11
-    strategy:
-      matrix:
-        target:
-        - ''
-        - '-DMOLD_USE_ASAN=On'
-    steps:
-    - uses: actions/checkout@v2
-    - name: ccache
-      uses: hendrikmuhs/ccache-action@v1
-    - name: build and test
-      run: |
-        echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
         mkdir build
         cd build
-        cmake ${{ matrix.target }} ..
+        cmake ..
+        cmake --build . -j$(nproc)
+    - run: cd build; ctest --output-on-failure -j$(nproc)
+    - name: sanitize distro name
+      if: failure()
+      id: sanitize
+      run: echo "name=$(echo '${{ matrix.distro }}' | tr '/:' '--')" >> "$GITHUB_OUTPUT"
+    - name: archive test results
+      uses: actions/upload-artifact@v7
+      if: failure()
+      with:
+        name: test-results-${{ steps.sanitize.outputs.name }}
+        path: |
+          build
+          !build/CMakeFiles
+
+  build-macos:
+    runs-on: macos-latest
+    timeout-minutes: 60
+    steps:
+    - uses: actions/checkout@v6
+    - name: build
+      run: |
+        mkdir build
+        cd build
+        cmake ..
         cmake --build . -j$(sysctl -n hw.physicalcpu)
-        ctest . -j$(sysctl -n hw.physicalcpu)
 
   build-windows:
     runs-on: windows-latest
+    timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - name: build
       run: |
         mkdir build
         cd build
         cmake -T clangcl ..
         cmake --build . -j $Env:NUMBER_OF_PROCESSORS
+
+  build-msys:
+    runs-on: windows-latest
+    timeout-minutes: 60
+    steps:
+    - uses: actions/checkout@v6
+    - name: Setup MSYS2
+      uses: msys2/setup-msys2@v2
+      with:
+        msystem: UCRT64
+        update: true
+        pacboy: gcc-libs:p libwinpthread-git:p tbb:p zlib:p zstd:p dlfcn:p cc:p cmake:p ninja:p
+    - name: build
+      shell: msys2 {0}
+      run: |
+        mkdir build
+        cd build
+        cmake -GNinja -DMOLD_USE_MIMALLOC=OFF -DMOLD_USE_SYSTEM_TBB=ON ..
+        cmake --build . -j $(nproc)
+
+  build-freebsd:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+    - uses: actions/checkout@v6
+    - name: Build and test
+      uses: vmactions/freebsd-vm@v1
+      with:
+        usesh: true
+        run: |
+          ./install-build-deps.sh
+          mkdir build
+          cd build
+          cmake ..
+          cmake --build . -j$(nproc)
+          ctest --output-on-failure -j$(nproc)

.github/workflows/install-extras.sh

@@ -0,0 +1,75 @@
+#!/bin/bash -x
+
+apt-get update
+apt-get install -y wget xz-utils
+
+# Install a 32-bit RISC-V toolchain
+mkdir /rv32
+wget -O- --progress=dot:mega https://github.com/riscv-collab/riscv-gnu-toolchain/releases/download/2025.06.13/riscv32-glibc-ubuntu-24.04-gcc-nightly-2025.06.13-nightly.tar.xz | tar -C /rv32 --strip-components=1 --xz -xf -
+
+ln -sf /rv32/sysroot /usr/riscv32-linux-gnu
+echo '/rv32/bin/riscv32-unknown-linux-gnu-gcc -L/usr/riscv32-linux-gnu "$@"' > /usr/bin/riscv32-linux-gnu-gcc
+echo '/rv32/bin/riscv32-unknown-linux-gnu-g++ -L/usr/riscv32-linux-gnu "$@"' > /usr/bin/riscv32-linux-gnu-g++
+chmod 755 /usr/bin/riscv32-linux-gnu-{gcc,g++}
+
+for i in objdump objcopy strip; do
+  ln -sf /rv32/bin/riscv32-unknown-linux-gnu-$i /usr/bin/riscv32-linux-gnu-$i
+done
+
+# Install a LoongArch toolchain
+mkdir /larch
+wget -O- --progress=dot:mega https://github.com/loongson/build-tools/releases/download/2025.06.06/x86_64-cross-tools-loongarch64-binutils_2.44-gcc_15.1.0-glibc_2.41.tar.xz | tar -C /larch --strip-components=1 --xz -xf -
+
+cp -r /larch/loongarch64-unknown-linux-gnu/lib/* /larch/target/lib64
+ln -sf /larch/target /usr/loongarch64-linux-gnu
+
+for i in gcc g++ objdump objcopy strip; do
+  ln -sf /larch/bin/loongarch64-unknown-linux-gnu-$i /usr/bin/loongarch64-linux-gnu-$i
+done
+
+wget -O /usr/local/bin/qemu-loongarch64 --progress=dot:mega https://github.com/loongson/build-tools/releases/download/2025.06.06/qemu-loongarch64
+chmod 755 /usr/local/bin/qemu-loongarch64
+
+# Install ARM32 big-endian toolchain
+mkdir /armeb
+wget -O- --progress=dot:mega https://toolchains.bootlin.com/downloads/releases/toolchains/armebv7-eabihf/tarballs/armebv7-eabihf--glibc--stable-2024.05-1.tar.xz | tar -C /armeb --strip-components=1 --xz -xf -
+
+ln -sf /armeb/armeb-buildroot-linux-gnueabihf/sysroot /usr/armeb-linux-gnueabihf
+echo '/armeb/bin/armeb-linux-gcc -L/usr/armeb-linux-gnu "$@"' > /usr/bin/armeb-linux-gnueabihf-gcc
+echo '/armeb/bin/armeb-linux-g++ -L/usr/armeb-linux-gnu "$@"' > /usr/bin/armeb-linux-gnueabihf-g++
+chmod 755 /usr/bin/armeb-linux-gnueabihf-{gcc,g++}
+
+for i in objdump objcopy strip; do
+  ln -sf /armeb/bin/armeb-linux-$i /usr/bin/armeb-linux-gnueabihf-$i
+done
+
+# Install ARM64 big-endian toolchain
+mkdir /aarch64be
+wget -O- --progress=dot:mega https://toolchains.bootlin.com/downloads/releases/toolchains/aarch64be/tarballs/aarch64be--glibc--stable-2024.05-1.tar.xz | tar -C /aarch64be --strip-components=1 --xz -xf -
+
+ln -sf /aarch64be/aarch64_be-buildroot-linux-gnu/sysroot /usr/aarch64_be-linux-gnu
+echo '/aarch64be/bin/aarch64_be-linux-gcc -L/usr/aarch64_be-linux-gnu "$@"' > /usr/bin/aarch64_be-linux-gnu-gcc
+echo '/aarch64be/bin/aarch64_be-linux-g++ -L/usr/aarch64_be-linux-gnu "$@"' > /usr/bin/aarch64_be-linux-gnu-g++
+chmod 755 /usr/bin/aarch64_be-linux-gnu-{gcc,g++}
+
+for i in objdump objcopy strip; do
+  ln -sf /aarch64be/bin/aarch64_be-linux-$i /usr/bin/aarch64_be-linux-gnu-$i
+done
+
+# Install SH4 big-endian toolchain
+mkdir /sh4aeb
+wget -O- --progress=dot:mega https://toolchains.bootlin.com/downloads/releases/toolchains/sh-sh4aeb/tarballs/sh-sh4aeb--glibc--stable-2024.05-1.tar.xz | tar -C /sh4aeb --strip-components=1 --xz -xf -
+
+ln -sf /sh4aeb/sh4aeb-buildroot-linux-gnu/sysroot /usr/sh4aeb-linux-gnu
+echo '/sh4aeb/bin/sh4aeb-linux-gcc -L/usr/sh4aeb-linux-gnu "$@"' > /usr/bin/sh4aeb-linux-gnu-gcc
+echo '/sh4aeb/bin/sh4aeb-linux-g++ -L/usr/sh4aeb-linux-gnu "$@"' > /usr/bin/sh4aeb-linux-gnu-g++
+chmod 755 /usr/bin/sh4aeb-linux-gnu-{gcc,g++}
+
+for i in objdump objcopy strip; do
+  ln -sf /sh4aeb/bin/sh4aeb-linux-$i /usr/bin/sh4aeb-linux-gnu-$i
+done
+
+# Install Intel SDE CPU emulator for CET-related tests
+mkdir /sde
+wget -O- --progress=dot:mega https://downloadmirror.intel.com/850782/sde-external-9.53.0-2025-03-16-lin.tar.xz | tar -C /sde --strip-components=1 --xz -xf -
+ln -s /sde/sde64 /usr/bin

.github/workflows/release-assets.yml

@@ -0,0 +1,104 @@
+name: Build & attach tarballs on tag push
+
+on:
+  push:
+    tags: ['v[0-9]*']
+
+permissions:
+  contents: write
+  packages: write
+  id-token: write
+
+env:
+  TAG: ${{ github.ref_name }}
+
+jobs:
+  build-linux:
+    strategy:
+      matrix:
+        include:
+        - { target: x86_64,      os: ubuntu-24.04 }
+        - { target: aarch64,     os: ubuntu-24.04-arm }
+        - { target: arm,         os: ubuntu-24.04-arm }
+        - { target: riscv64,     os: ubuntu-24.04 }
+        - { target: ppc64le,     os: ubuntu-24.04 }
+        - { target: s390x,       os: ubuntu-24.04 }
+        - { target: loongarch64, os: ubuntu-24.04 }
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - uses: actions/checkout@v6
+
+    - name: Install Podman
+      run: sudo apt-get update && sudo apt-get install -y podman qemu-user-static
+
+    - name: Login to GitHub Container Registry
+      uses: redhat-actions/podman-login@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - run: ./dist.sh ${{ matrix.target }}
+
+    - uses: actions/upload-artifact@v7
+      with:
+        name: ${{ matrix.target }}
+        path: dist/mold-*.tar.gz
+
+  build-windows:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v6
+
+    - name: Build and Archive
+      shell: pwsh
+      run: |
+        mkdir build
+        cd build
+        cmake -T clangcl ..
+        cmake --build . --config Release -j $Env:NUMBER_OF_PROCESSORS
+        cmake --install . --config Release --prefix ../mold-install
+        cd ..
+        New-Item -ItemType Directory -Force dist | Out-Null
+        $version = $Env:TAG -replace '^v', ''
+        Compress-Archive -Path mold-install\* -DestinationPath dist\mold-$version-x86_64-windows.zip
+
+    - uses: actions/upload-artifact@v7
+      with:
+        name: win-x86_64
+        path: dist/mold-*.*
+
+  publish:
+    needs: [build-linux, build-windows]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v6
+
+    - uses: actions/download-artifact@v8
+      with:
+        path: dist
+        pattern: '*'
+        merge-multiple: true
+
+    - name: Ensure release exists (create if missing)
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        set -e
+        if gh release view "$TAG" >& /dev/null; then
+          echo "Existing release found for $TAG"
+        else
+          echo "Creating draft release for $TAG"
+          gh release create "$TAG" --draft \
+            --title "$TAG" \
+            --notes "Automated draft – fill the changelog later."
+        fi
+
+    - name: Upload tarballs
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        gh release upload "$TAG" dist/* --clobber
+        gh release view "$TAG" --json assets --jq '.assets[].name'

.github/workflows/run-msan.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+set -e -x
+cd "$(dirname $0)"/../..
+
+if [ "$GITHUB_REPOSITORY" = '' ]; then
+  image=mold-msan
+  image_build="podman build -t $image -"
+else
+  # If this script is running on GitHub Actions, we want to cache
+  # the created container image in GitHub's container repostiory.
+  image=ghcr.io/$GITHUB_REPOSITORY/mold-msan
+  image_build="podman build -t $image --output=type=registry --layers --cache-to $image --cache-from $image -"
+fi
+
+cat <<EOF | $image_build
+FROM mirror.gcr.io/library/ubuntu:24.04
+RUN apt-get update && \
+  apt-get install -y --no-install-recommends build-essential gcc g++ wget ca-certificates make cmake ninja-build python3 clang-20 llvm-20-dev libclang-20-dev libclang-rt-20-dev libtbb-dev mold && \
+  rm -rf /var/lib/apt/lists
+RUN mkdir /llvm && \
+  cd /llvm && \
+  wget -O- --progress=dot:mega https://github.com/llvm/llvm-project/archive/refs/tags/llvmorg-21.1.1.tar.gz | tar xzf - --strip-components=1 && \
+  cmake -S ./runtimes -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES='libcxx;libcxxabi;libunwind' -DCMAKE_C_COMPILER=clang-20 -DCMAKE_CXX_COMPILER=clang++-20 -DLLVM_USE_SANITIZER=MemoryWithOrigins && \
+  cmake --build build -j\$(nproc) && \
+  cmake --install build --prefix /msan && \
+  rm -rf /llvm
+EOF
+
+# Build mold and run its tests
+podman run -it --rm --pull=never -v "$(pwd):/mold:ro" --security-opt seccomp=unconfined $image bash -c "
+set -e
+mkdir /build
+cd /build
+cmake -GNinja -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_COMPILER=clang-20 -DCMAKE_CXX_COMPILER=clang++-20 -DMOLD_USE_MSAN=ON -DMOLD_STDLIB_PREFIX=/msan -DMOLD_USE_MIMALLOC=0 -DMOLD_USE_SYSTEM_TBB=1 -DMOLD_USE_MOLD=1 /mold
+cmake --build . -j\$(nproc)
+setarch -R ctest --output-on-failure -j\$(nproc)
+"

.github/workflows/update-manpage.yml

@@ -0,0 +1,33 @@
+name: Update manpage
+
+on:
+  push:
+    paths:
+      - 'docs/mold.md'
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  update-manpage:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v6
+
+    - name: Install ronn
+      run: sudo apt-get update && sudo apt-get install -y ronn
+
+    - name: Generate mold.1 from mold.md
+      run: ronn --roff docs/mold.md
+
+    - name: Configure Git
+      run: |
+        git config --global user.name 'Rui Ueyama'
+        git config --global user.email '[email protected]'
+
+    - name: Commit and push if mold.1 is updated
+      run: |
+        git add docs/mold.1
+        git diff --staged --quiet || (git commit -m "Update mold.1 (automated commit)" && git push)

.gitignore

@@ -1,15 +1,11 @@
 *.o
 *.so
 *~
+**/.DS_Store
 .cache
-compile_commands.json
-/mold
-/test/tmp
-options.inc
 core
-ld
-ld64
-ld64.mold
 gentoo
-out
 /mold-*.tar.gz
+/build*
+/mold
+/dist

CMakeLists.txt

@@ -1,90 +1,223 @@
-cmake_minimum_required(VERSION 3.18)
-project(mold VERSION 1.4.1)
+# You can customize a build by specifying CMake options. An option may be
+# given in the -Dvariable=value form. For a boolean variable, `ON` or `1`
+# means true, while `OFF` or `0` means false.
+#
+# Here are a couple of common cmake options:
+#
+#  -DCMAKE_C_COMPILER=<command-name>
+#
+#   Specifies the C compiler name to use. The default value is `cc`.
+#
+#  -DCMAKE_CXX_COMPILER=<command-name>
+#
+#   Specifies the C++ compiler name to use. The default value is `c++`.
+#
+#  -DCMAKE_INSTALL_PREFIX=<directory>
+#
+#   Specifies the install target directory. The default value is `/usr/local`.
+#
+#  -DCMAKE_BUILD_TYPE=[Debug | Release | RelWithDebInfo | MinSizeRel]
+#
+#   Specifies the build type. The default is `Release`, which is the right
+#   option unless you are debugging mold.
+#
+# An example of a cmake command line is shown below:
+#
+#   $ cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_CXX_COMPILER=g++-12 ..
+#
+# where `..` refers to this directory.
+#
+# With cmake, you may run `cmake --install .` instead of `make install` to
+# install build artifacts to system directories. If you want to install
+# artifacts to a temporary target directory, run `cmake --install . --prefix
+# <dir>`.
+#
+# You can see the current cmake variables and their values by running
+# `cmake -N -L .` in a build directory.
+#
+# Note that in this file, we provide various dials and knobs to configure
+# how to build mold. However, as a policy, we do not provide a way to
+# enable/disable any individual mold's feature. In other words, we do not
+# provide options like `--enable-foo` or `--disable-foo`. The motivation
+# behind this is build reproducibility. We want to guarantee that all builds
+# of the mold linker of the same version will have the exact same set of
+# features and behave exactly the same.
+
+cmake_minimum_required(VERSION 3.14)
+project(mold VERSION 2.41.0)
 
 include(CMakeDependentOption)
-
-# FIXME: this is for parity with the makefiles that install directly to
-# <prefix>/lib
-#
-# NOTE: defining this before including GNUInstallDirs makes its platform
-# detection a noop
-set(CMAKE_INSTALL_LIBDIR lib CACHE PATH "")
+include(CheckSymbolExists)
 include(GNUInstallDirs)
 
-# Add -fuse-ld=mold if accepted by the compiler.
-option(MOLD_USE_MOLD "Use mold to build mold" ON)
-if(MOLD_USE_MOLD)
-  include(CheckLinkerFlag)
-  check_linker_flag(CXX -fuse-ld=mold CXX_SUPPORTS_FUSE_MOLD)
-  if(CXX_SUPPORTS_FUSE_MOLD)
-    add_link_options(-fuse-ld=mold)
-  endif()
-endif()
-
 add_executable(mold)
 target_compile_features(mold PRIVATE cxx_std_20)
-target_link_libraries(mold PRIVATE ${CMAKE_DL_LIBS})
 
-if("${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}" STRLESS "MSVC")
+if(MINGW)
+  target_link_libraries(mold PRIVATE dl)
+else()
+  target_link_libraries(mold PRIVATE ${CMAKE_DL_LIBS})
+endif()
+
+# Build mold itself using mold if -DMOLD_USE_MOLD=ON
+option(MOLD_USE_MOLD "Use mold to build mold" OFF)
+if(MOLD_USE_MOLD)
+  target_link_options(mold PRIVATE -fuse-ld=mold)
+
+  if(CMAKE_BUILD_TYPE MATCHES "Deb")
+    target_link_options(mold PRIVATE -Wl,--gdb-index)
+  endif()
+
+  if(CMAKE_BUILD_TYPE MATCHES "^Rel")
+    target_link_options(mold PRIVATE -Wl,--gc-sections,--icf=safe)
+  endif()
+endif()
+
+if(NOT "${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}" STREQUAL "MSVC")
   target_compile_options(mold PRIVATE
     -fno-exceptions
     -fno-unwind-tables
-    -fno-asynchronous-unwind-tables)
+    -fno-asynchronous-unwind-tables
+    -ffunction-sections
+    -fdata-sections
+    -Wall
+    -Wextra
+    -Wno-sign-compare
+    -Wno-unused-function
+    -Wno-unused-parameter
+    -Wno-missing-field-initializers
+    -ggnu-pubnames)
 endif()
 
-# Build mold with -flto if MOLD_LTO=On
+if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+  target_compile_options(mold PRIVATE -D_GLIBCXX_ASSERTIONS)
+endif()
+
+if(CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
+  set(OPENBSD ON)
+endif()
+
+# Build mold with -flto if -DMOLD_LTO=ON
 option(MOLD_LTO "Build mold with link-time optimization enabled")
 if(MOLD_LTO)
   set_property(TARGET mold PROPERTY INTERPROCEDURAL_OPTIMIZATION ON)
 endif()
 
-# Handle MOLD_USE_ASAN and MOLD_USE_TSAN
+# Enable AddressSanitizer if -DMOLD_USE_ASAN=ON
 option(MOLD_USE_ASAN "Build mold with AddressSanitizer" OFF)
 if(MOLD_USE_ASAN)
   target_compile_options(mold PRIVATE -fsanitize=address -fsanitize=undefined)
   target_link_options(mold PRIVATE -fsanitize=address -fsanitize=undefined)
 endif()
 
+# Enabled ThreadSanitizer if -DMOLD_USE_TSAN=ON
 option(MOLD_USE_TSAN "Build mold with ThreadSanitizer" OFF)
 if(MOLD_USE_TSAN)
   target_compile_options(mold PRIVATE -fsanitize=thread)
   target_link_options(mold PRIVATE -fsanitize=thread)
 endif()
 
-# Static link libstdc++ and libcrypto if MOLD_MOSTLY_STATIC=On
-option(MOLD_MOSTLY_STATIC "Statically link libstdc++ and libcrypto" OFF)
-if(MOLD_MOSTLY_STATIC)
-  target_link_options(mold PRIVATE -static-libstdc++)
-  target_link_libraries(mold PRIVATE libcrypto.a)
+# Enable MemorySanitizer if -DMOLD_USE_MSAN=ON
+option(MOLD_USE_MSAN "Build mold with MemorySanitizer" OFF)
+if(MOLD_USE_MSAN)
+  set(MOLD_STDLIB_PREFIX /usr CACHE FILEPATH "prefix of instrumented stdlib")
+  target_compile_options(mold PRIVATE
+    -g -Og -fsanitize=memory -fsanitize-memory-track-origins
+    -nostdinc++ -isystem ${MOLD_STDLIB_PREFIX}/include/c++/v1
+    -DENABLE_MSAN_UNPOISON
+  )
+  target_link_options(mold PRIVATE
+    -fsanitize=memory
+    -nostdlib++ -L ${MOLD_STDLIB_PREFIX}/lib -lc++
+    -Wl,-rpath,${MOLD_STDLIB_PREFIX}/lib
+  )
 endif()
 
-# Setup zlib
+# Statically-link libstdc++ if -DMOLD_MOSTLY_STATIC=ON.
+#
+# This option is intended to be used by `./dist.sh` script to create a
+# mold binary that works on various Linux distros. You probably don't
+# need nor want to set this to ON.
+option(MOLD_MOSTLY_STATIC "Statically link libstdc++ and some other libraries" OFF)
+if(MOLD_MOSTLY_STATIC)
+  target_link_options(mold PRIVATE -static-libstdc++)
+endif()
+
+# Find zlib. If libz.so is not found, we compile a bundled one and
+# statically-link it to mold.
 find_package(ZLIB QUIET)
-if(ZLIB_FOUND)
+if(ZLIB_FOUND AND NOT MOLD_MOSTLY_STATIC)
   target_link_libraries(mold PRIVATE ZLIB::ZLIB)
 else()
+  set(ZLIB_BUILD_EXAMPLES OFF CACHE INTERNAL "")
   add_subdirectory(third-party/zlib EXCLUDE_FROM_ALL)
   target_include_directories(zlibstatic INTERFACE third-party/zlib
     $<TARGET_PROPERTY:zlibstatic,BINARY_DIR>)
   target_link_libraries(mold PRIVATE zlibstatic)
 endif()
 
-# Setup mimalloc
-cmake_dependent_option(MOLD_USE_MIMALLOC "Use mimalloc" ON
-  "NOT APPLE;NOT ANDROID" OFF)
+# Find BLAKE3 cryptographic hash library. Just like zlib, if libblkae3.so
+# is not found, we compile a bundled one and statically-link it to mold.
+find_package(BLAKE3 QUIET)
+if(BLAKE3_FOUND AND NOT MOLD_MOSTLY_STATIC)
+  target_link_libraries(mold PRIVATE BLAKE3::blake3)
+else()
+  function(mold_add_blake3)
+    set(BUILD_SHARED_LIBS OFF)
+    add_subdirectory(third-party/blake3/c EXCLUDE_FROM_ALL)
+    target_link_libraries(mold PRIVATE blake3)
+    target_include_directories(mold PUBLIC third-party/blake3/c)
+  endfunction()
+
+  mold_add_blake3()
+endif()
+
+# Find zstd compression library. If zstd.h is not found, we compile a
+# bundled one and statically-link it to mold.
+include(CheckIncludeFile)
+check_include_file(zstd.h HAVE_ZSTD_H)
+
+if(HAVE_ZSTD_H AND NOT MOLD_MOSTLY_STATIC)
+  target_link_libraries(mold PRIVATE zstd)
+else()
+  set(ZSTD_BUILD_PROGRAMS OFF)
+  set(ZSTD_BUILD_CONTRIB OFF)
+  set(ZSTD_BUILD_TESTS OFF)
+  set(ZSTD_MULTITHREAD_SUPPORT OFF)
+  set(ZSTD_BUILD_SHARED OFF)
+  set(ZSTD_BUILD_STATIC ON)
+  add_subdirectory(third-party/zstd/build/cmake EXCLUDE_FROM_ALL)
+  target_include_directories(mold PUBLIC third-party/zstd/lib)
+  target_link_libraries(mold PRIVATE libzstd_static)
+endif()
+
+# Find mimalloc. mimalloc is an alternative malloc implementation
+# optimized for multi-threaded applications.
+#
+# If you want to use the usual libc's malloc, pass -DMOLD_USE_MIMALLOC=OFF.
+#
+# We enable mimalloc by default for 64-bit targets. It doesn't seem to
+# be stable on 32-bit targets.
+cmake_dependent_option(
+  MOLD_USE_MIMALLOC "Use mimalloc" ON
+  "CMAKE_SIZEOF_VOID_P EQUAL 8; NOT APPLE; NOT ANDROID; NOT OPENBSD; NOT MOLD_USE_ASAN; NOT MOLD_USE_TSAN" OFF)
+
 cmake_dependent_option(
   MOLD_USE_SYSTEM_MIMALLOC "Use system or vendored mimalloc" OFF
   MOLD_USE_MIMALLOC OFF)
 
+# By default, we build a bundled mimalloc and statically-link it to
+# mold. If you want to dynamically link to the system's
+# libmimalloc.so, pass -DMOLD_USE_SYSTEM_MIMALLOC=ON.
 if(MOLD_USE_MIMALLOC)
   if(MOLD_USE_SYSTEM_MIMALLOC)
     find_package(mimalloc REQUIRED)
-    target_compile_definitions(mimalloc INTERFACE USE_SYSTEM_MIMALLOC)
     target_link_libraries(mold PRIVATE mimalloc)
   else()
     function(mold_add_mimalloc)
-      set(MI_BUILD_STATIC ON)
-      option(MI_BUILD_TESTS "Build test executables" OFF)
+      set(MI_BUILD_STATIC ON CACHE INTERNAL "")
+      set(MI_BUILD_TESTS OFF CACHE INTERNAL "")
+      set(MI_NO_OPT_ARCH ON CACHE INTERNAL "")
       add_subdirectory(third-party/mimalloc EXCLUDE_FROM_ALL)
       target_compile_definitions(mimalloc-static PRIVATE MI_USE_ENVIRON=0)
       target_link_libraries(mold PRIVATE mimalloc-static)
@@ -94,9 +227,14 @@ if(MOLD_USE_MIMALLOC)
   endif()
 endif()
 
-# Setup TBB
+# Find TBB. TBB (OneTBB or Intel TBB) is a high-level threading library.
+# Use of this library is mandatory.
+#
+# By default, we build a bundled one and statically-link the library
+# to mold. If you want to link to the system's libtbb2.so, pass
+# -DMOLD_USE_SYSTEM_TBB=ON.
 option(MOLD_USE_SYSTEM_TBB "Use system or vendored TBB" OFF)
-if(MOLD_USE_SYSTEM_TBB)
+if(MOLD_USE_SYSTEM_TBB OR BLAKE3_USE_TBB)
   find_package(TBB REQUIRED)
   target_link_libraries(mold PRIVATE TBB::tbb)
 else()
@@ -112,40 +250,27 @@ else()
   mold_add_tbb()
 endif()
 
-# MOLD_X86_64_ONLY is a developer-only option. You should not use it
-# for creating an executable for production use.
-option(MOLD_X86_64_ONLY "Developer-only option" OFF)
-if(MOLD_X86_64_ONLY)
-  set(CMAKE_BUILD_TYPE "Debug")
-  target_compile_options(mold PRIVATE -ffunction-sections -fdata-sections
-    -DMOLD_DEBUG_X86_64_ONLY)
-  target_link_options(mold PRIVATE -Wl,--gc-sections)
-endif()
-
+# We always use Clang to build mold on Windows. MSVC can't compile mold.
 if(WIN32)
-  if(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  if(MSVC AND NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
     message(FATAL_ERROR
       "Your compiler is not supported; install Clang from Visual Studio Installer and re-run cmake with '-T clangcl'")
-   endif()
+  endif()
 
   target_compile_definitions(mold PRIVATE NOGDI NOMINMAX)
-
-  target_sources(mold PRIVATE
-    elf/lto-win32.cc
-    macho/lto-win32.cc)
+  if(MINGW)
+    target_compile_definitions(mold PRIVATE _WIN32_WINNT=0xA00)
+    target_link_libraries(mold PRIVATE bcrypt)
+  endif()
 else()
   include(CheckLibraryExists)
   check_library_exists(m pow "" LIBM_FOUND)
   if(LIBM_FOUND)
     target_link_libraries(mold PRIVATE m)
   endif()
-
-  target_sources(mold PRIVATE
-    elf/lto-unix.cc
-    elf/subprocess.cc
-    macho/lto-unix.cc)
 endif()
 
+# Build mold-wrapper.so
 if(NOT APPLE AND NOT WIN32)
   add_library(mold-wrapper SHARED)
   install(TARGETS mold-wrapper DESTINATION ${CMAKE_INSTALL_LIBDIR}/mold)
@@ -153,112 +278,216 @@ if(NOT APPLE AND NOT WIN32)
   # Remove the default `lib` prefix
   set_target_properties(mold-wrapper PROPERTIES PREFIX "")
   target_link_libraries(mold-wrapper PRIVATE ${CMAKE_DL_LIBS})
-  target_sources(mold-wrapper PRIVATE elf/mold-wrapper.c)
+  target_sources(mold-wrapper PRIVATE src/mold-wrapper.c)
 endif()
 
-if(NOT APPLE AND NOT MOLD_MOSTLY_STATIC AND NOT WIN32)
-  find_package(OpenSSL REQUIRED COMPONENTS Crypto)
-  target_link_libraries(mold PRIVATE OpenSSL::Crypto)
-endif()
+# If atomics doesn't work by default, add -latomic.
+# We need the flag on riscv, armv6 and m68k.
+include(CheckCXXSourceCompiles)
+check_cxx_source_compiles("#include <atomic>
+int main() {
+  std::atomic_uint8_t  a;
+  std::atomic_uint16_t b;
+  std::atomic_uint32_t c;
+  std::atomic_uint64_t d;
+  return ++a + ++b + ++c + ++d;
+}" HAVE_FULL_ATOMIC_SUPPORT)
 
-if(CMAKE_SYSTEM_PROCESSOR MATCHES riscv64
-    OR CMAKE_SYSTEM_PROCESSOR MATCHES armv6)
+if(NOT HAVE_FULL_ATOMIC_SUPPORT)
   target_link_libraries(mold PRIVATE atomic)
 endif()
 
-set_property(SOURCE main.cc elf/lto-unix.cc macho/output-chunks.cc APPEND PROPERTY
-  COMPILE_DEFINITIONS "MOLD_VERSION=\"${CMAKE_PROJECT_VERSION}\"")
+# Add -pthread
+if(NOT APPLE AND NOT MSVC)
+  target_compile_options(mold PRIVATE -pthread)
+  target_link_options(mold PRIVATE -pthread)
+endif()
 
-find_package(Python3 REQUIRED)
+check_symbol_exists(madvise sys/mman.h HAVE_MADVISE)
+check_symbol_exists(uname sys/utsname.h HAVE_UNAME)
 
-add_custom_target(UpdateGitHash
-  COMMAND ${Python3_EXECUTABLE} ${CMAKE_SOURCE_DIR}/update-git-hash.py
-    ${CMAKE_SOURCE_DIR} git-hash.cc
-  DEPENDS update-git-hash.py
-  BYPRODUCTS git-hash.cc
+# Create a .cc file containing the current git hash for `mold --version`.
+add_custom_target(git_hash
+  COMMAND ${CMAKE_COMMAND}
+    -DSOURCE_DIR=${CMAKE_SOURCE_DIR}
+    -DOUTPUT_FILE=${CMAKE_BINARY_DIR}/mold-git-hash.h
+    -P ${CMAKE_SOURCE_DIR}/lib/update-git-hash.cmake
+  DEPENDS lib/update-git-hash.cmake
+  BYPRODUCTS mold-git-hash.h
   VERBATIM)
 
-add_dependencies(mold UpdateGitHash)
+add_dependencies(mold git_hash)
 
-target_sources(mold PRIVATE
-  compress.cc
-  demangle.cc
-  elf/arch-arm32.cc
-  elf/arch-arm64.cc
-  elf/arch-i386.cc
-  elf/arch-riscv.cc
-  elf/arch-x86-64.cc
-  elf/cmdline.cc
-  elf/dwarf.cc
-  elf/gc-sections.cc
-  elf/icf.cc
-  elf/input-files.cc
-  elf/input-sections.cc
-  elf/linker-script.cc
-  elf/main.cc
-  elf/mapfile.cc
-  elf/output-chunks.cc
-  elf/passes.cc
-  elf/relocatable.cc
-  filepath.cc
-  git-hash.cc
-  glob.cc
-  hyperloglog.cc
-  macho/arch-arm64.cc
-  macho/arch-x86-64.cc
-  macho/cmdline.cc
-  macho/dead-strip.cc
-  macho/input-files.cc
-  macho/input-sections.cc
-  macho/main.cc
-  macho/mapfile.cc
-  macho/output-chunks.cc
-  macho/tapi.cc
-  macho/yaml.cc
-  main.cc
-  multi-glob.cc
-  perf.cc
-  strerror.cc
-  tar.cc
-  third-party/rust-demangle/rust-demangle.c
-  uuid.cc
+# Almost all functions are template in mold which take a target type
+# (e.g. X86_64) as its type parameter. Since we suport more than 10
+# targets, compiling a single source file for all the targets is very
+# slow.
+#
+# As a workaround, we create a .cc file for each target and spawn many
+# compiler instances. This is hacky but greatly reduces compile time
+# on a multicore machine.
+#
+# You can build mold for a specific set of targets by passing, e.g.,
+# -DMOLD_TARGETS='X86_64;ARM64LE', though this is strongly discouraged
+# for build reproducibility. Use this option only if you build mold
+# frequently for your personal use; otherwise, always build mold with all
+# targets enabled. We provide this flag in the trust that you will not
+# abuse it, so please don’t betray that trust.
+set(MOLD_TARGETS
+  X86_64 I386 ARM64LE ARM64BE ARM32LE ARM32BE RV32LE RV32BE RV64LE
+  RV64BE PPC32 PPC64V1 PPC64V2 S390X SPARC64 M68K SH4LE SH4BE
+  LOONGARCH32 LOONGARCH64
+  CACHE STRING "List of supported targets")
+
+list(GET MOLD_TARGETS 0 MOLD_FIRST_TARGET)
+
+list(APPEND MOLD_TEMPLATE_FILES
+  src/arch-arm32.cc
+  src/arch-arm64.cc
+  src/arch-i386.cc
+  src/arch-loongarch.cc
+  src/arch-m68k.cc
+  src/arch-ppc32.cc
+  src/arch-ppc64v1.cc
+  src/arch-ppc64v2.cc
+  src/arch-riscv.cc
+  src/arch-s390x.cc
+  src/arch-sh4.cc
+  src/arch-sparc64.cc
+  src/arch-x86-64.cc
+  src/archive-file.cc
+  src/cmdline.cc
+  src/error.cc
+  src/filetype.cc
+  src/gc-sections.cc
+  src/gdb-index.cc
+  src/icf.cc
+  src/input-files.cc
+  src/input-sections.cc
+  src/linker-script.cc
+  src/main.cc
+  src/mapfile.cc
+  src/output-chunks.cc
+  src/passes.cc
+  src/relocatable.cc
+  src/shrink-sections.cc
+  src/thunks.cc
+  src/tls.cc
   )
 
+if(WIN32 AND NOT MINGW)
+  list(APPEND MOLD_TEMPLATE_FILES src/lto-win32.cc)
+else()
+  list(APPEND MOLD_TEMPLATE_FILES src/lto-unix.cc)
+endif()
+
+if(WIN32)
+  list(APPEND MOLD_TEMPLATE_FILES
+    src/output-file-win32.cc
+    src/subprocess-win32.cc
+    )
+else()
+  list(APPEND MOLD_TEMPLATE_FILES
+    src/output-file-unix.cc
+    src/subprocess-unix.cc
+  )
+endif()
+
+function(mold_instantiate_templates SOURCE TARGET)
+  set(PATH ${CMAKE_BINARY_DIR}/${SOURCE}.${TARGET}.cc)
+  if(NOT EXISTS ${PATH})
+    file(WRITE ${PATH} "#define MOLD_${TARGET} 1
+#define MOLD_TARGET ${TARGET}
+#include \"${CMAKE_SOURCE_DIR}/${SOURCE}\"
+")
+  endif()
+  target_sources(mold PRIVATE ${PATH})
+endfunction()
+
+foreach (SOURCE IN LISTS MOLD_TEMPLATE_FILES)
+  foreach(TARGET IN LISTS MOLD_TARGETS)
+    mold_instantiate_templates(${SOURCE} ${TARGET})
+    set(HAVE_TARGET_${TARGET} 1)
+  endforeach()
+endforeach()
+
+# Add other non-template source files.
+target_sources(mold PRIVATE
+  lib/aho-corasick.cc
+  lib/compress.cc
+  lib/crc32.cc
+  lib/demangle.cc
+  lib/filepath.cc
+  lib/glob.cc
+  lib/hyperloglog.cc
+  lib/perf.cc
+  lib/random.cc
+  lib/tar.cc
+  src/elf.cc
+  src/entry.cc
+  third-party/rust-demangle/rust-demangle.c
+  )
+
+if(WIN32)
+  target_sources(mold PRIVATE
+    src/jobs-win32.cc
+    src/mapped-file-win32.cc
+    src/signal-win32.cc
+    )
+else()
+  target_sources(mold PRIVATE
+    src/jobs-unix.cc
+    src/mapped-file-unix.cc
+    src/signal-unix.cc
+    )
+endif()
+
+# Create config.h file
+configure_file(lib/config.h.in config.h)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+# Test configs
 include(CTest)
 
 if(BUILD_TESTING)
-  # Create the ld and ld64 symlinks required for testing
+  # Create the ld symlinks required for testing
   if(NOT WIN32)
     add_custom_command(
       TARGET mold POST_BUILD
       COMMAND ${CMAKE_COMMAND} -E create_symlink mold ld
-      COMMAND ${CMAKE_COMMAND} -E create_symlink mold ld64
+      BYPRODUCTS ld
       WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
       VERBATIM)
   endif()
 
-  if(${APPLE})
-    add_subdirectory(test/macho)
-  elseif(${UNIX})
-    add_subdirectory(test/elf)
+  if(${UNIX})
+    add_subdirectory(test)
   endif()
 endif()
 
 if(NOT CMAKE_SKIP_INSTALL_RULES)
-  install(TARGETS mold)
-  install(FILES LICENSE DESTINATION ${CMAKE_INSTALL_DOCDIR})
+  install(TARGETS mold RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
   install(FILES docs/mold.1 DESTINATION ${CMAKE_INSTALL_MANDIR}/man1/)
-  install(CODE "
-        file(RELATIVE_PATH RELPATH
-             /${CMAKE_INSTALL_LIBEXECDIR}/mold /${CMAKE_INSTALL_BINDIR}/mold)
-        execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory
-            \${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBEXECDIR}/mold)
-        execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink \${RELPATH}
-            \${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBEXECDIR}/mold/ld)
-        execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink mold
-            \${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/ld.mold)
-        execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink mold
-            \${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/ld64.mold)
-        execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink mold.1
-            \${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_MANDIR}/man1/ld.mold.1)")
+  install(FILES LICENSE DESTINATION ${CMAKE_INSTALL_DOCDIR})
+
+  function(mold_install_relative_symlink OLD NEW)
+    install(CODE "
+      get_filename_component(PREFIX_ABS \${CMAKE_INSTALL_PREFIX}/ ABSOLUTE)
+      get_filename_component(OLD_ABS ${OLD} ABSOLUTE BASE_DIR \${PREFIX_ABS})
+      get_filename_component(NEW_ABS ${NEW} ABSOLUTE BASE_DIR \${PREFIX_ABS})
+      get_filename_component(NEW_DIR \${NEW_ABS} DIRECTORY)
+      file(RELATIVE_PATH OLD_REL \${NEW_DIR} \${OLD_ABS})
+      message(STATUS \"Installing symlink: \$ENV{DESTDIR}\${NEW_ABS} -> \${OLD_REL}\")
+      file(MAKE_DIRECTORY \$ENV{DESTDIR}\${NEW_DIR})
+      file(CREATE_LINK \${OLD_REL} \$ENV{DESTDIR}\${NEW_ABS} SYMBOLIC)")
+  endfunction()
+
+  if(NOT WIN32)
+    mold_install_relative_symlink(${CMAKE_INSTALL_BINDIR}/mold${CMAKE_EXECUTABLE_SUFFIX}
+      ${CMAKE_INSTALL_LIBEXECDIR}/mold/ld${CMAKE_EXECUTABLE_SUFFIX})
+    mold_install_relative_symlink(${CMAKE_INSTALL_BINDIR}/mold${CMAKE_EXECUTABLE_SUFFIX}
+      ${CMAKE_INSTALL_BINDIR}/ld.mold${CMAKE_EXECUTABLE_SUFFIX})
+    mold_install_relative_symlink(${CMAKE_INSTALL_MANDIR}/man1/mold.1
+      ${CMAKE_INSTALL_MANDIR}/man1/ld.mold.1)
+  endif()
 endif()

CMakeSettings.json

@@ -1,15 +0,0 @@
-{
-  "configurations": [
-    {
-      "name": "x64-Debug",
-      "generator": "Ninja",
-      "configurationType": "Debug",
-      "inheritEnvironments": [ "clang_cl_x64" ],
-      "buildRoot": "${projectDir}\\out\\build\\${name}",
-      "installRoot": "${projectDir}\\out\\install\\${name}",
-      "cmakeCommandArgs": "",
-      "buildCommandArgs": "",
-      "ctestCommandArgs": ""
-    }
-  ]
-}

CONTRIBUTING.md

@@ -1,54 +0,0 @@
-# Contributing to mold
-
-Summary: When you send a patch, you must agree that the patch is
-released under the dual license of the GNU AGPLv3 and the MIT license.
-As an indication of agreement, please add a `Signed-off-by` line to
-your commit message using `git commit -s`.
-
-Here is the long official version:
-
-mold is currently licensed under the GNU AGPLv3, but I want to relicense
-it under a more liberal license in the future. To make this possible,
-I want all patches to be submitted under the dual license of the GNU
-AGPLv3 and the MIT license (the "Dual License") from the beginning.
-
-To make it clear that contributors have agreed to release their
-patches under the Dual License, I introduced a sign-off procedure just
-like the Linux kernel project did. The sign-off is a simple line at
-the end of the git commit message, which certifies that you wrote it
-or otherwise have the right to pass it on as an open-source patch. The
-rules are pretty simple: if you can certify the below:
-
-> ## Developer's Certificate of Origin
->
-> By making a contribution to this project, I certify that:
->
->  1. The contribution was created in whole or in part by me and I
->     have the right to submit it under the Dual License; or
->
->  2. The contribution is based upon previous work that, to the best
->     of my knowledge, is covered under the the Dual License and I
->     have the right under the Dual License to submit that work with
->     modifications, whether created in whole or in part by me, under
->     the Dual License (unless I am permitted to submit under
->     different licenses), as indicated in the file; or
->
->  3. The contribution was provided directly to me by some other
->     person who certified (1), (2) or (3) and I have not modified it.
->
->  4. I understand and agree that this project and the contribution
->     are public and that a record of the contribution (including all
->     personal information I submit with it, including my sign-off) is
->     maintained indefinitely and may be redistributed consistent with
->     this project or the open source license(s) involved.
-
-then you just add a line saying:
-
-```
-Signed-off-by: Random J Developer <[email protected]>
-```
-
-using your real name (sorry, no pseudonyms or anonymous contributions.)
-This will be done for you automatically if you use ``git commit -s``.
-Reverts should also include "Signed-off-by". ``git revert -s`` does that
-for you.

Dockerfile

@@ -1,21 +0,0 @@
-# This dockerfile creates a reproducible build environment for mold.
-#
-# $ docker build -t rui314/mold-builder:v1-$(uname -m) .
-# $ docker push rui314/mold-builder:v1-$(uname -m)
-
-FROM ubuntu:18.04
-ENV TZ=Europe/London
-RUN apt-get update && \
-  apt-get install -y --no-install-recommends software-properties-common && \
-  add-apt-repository -y ppa:ubuntu-toolchain-r/test && \
-  apt-get update && \
-  apt-get install -y --no-install-recommends build-essential wget \
-    libstdc++-11-dev zlib1g-dev gcc-10 g++-10 python3 && \
-  cd / && \
-  wget -O- -q https://www.openssl.org/source/openssl-3.0.5.tar.gz | tar xzf - && \
-  mv openssl-3.0.5 openssl && \
-  cd openssl && \
-  ./Configure --prefix=/usr/local && \
-  make -j$(nproc) && \
-  make -j$(nproc) install && \
-  wget -O- -q https://github.com/Kitware/CMake/releases/download/v3.24.0/cmake-3.24.0-linux-$(uname -m).tar.gz | tar -C /usr/local --strip-components=1 -xzf -

LICENSE

@@ -1,690 +1,6 @@
-Note: I'm looking for a sponsor who wants to purchase the copyright
-of this work and relicense it under a more liberal license such as
-the MIT license. For now, mold is released under the GNU AGPL v3.
-
-If you just want to use mold but do not want to use AGPL software
-in your organization, a commercial license is available. Please
-contact [email protected].
-
-
-
-                    GNU AFFERO GENERAL PUBLIC LICENSE
-                       Version 3, 19 November 2007
-
- Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
-  The GNU Affero General Public License is a free, copyleft license for
-software and other kinds of works, specifically designed to ensure
-cooperation with the community in the case of network server software.
-
-  The licenses for most software and other practical works are designed
-to take away your freedom to share and change the works.  By contrast,
-our General Public Licenses are intended to guarantee your freedom to
-share and change all versions of a program--to make sure it remains free
-software for all its users.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-them if you wish), that you receive source code or can get it if you
-want it, that you can change the software or use pieces of it in new
-free programs, and that you know you can do these things.
-
-  Developers that use our General Public Licenses protect your rights
-with two steps: (1) assert copyright on the software, and (2) offer
-you this License which gives you legal permission to copy, distribute
-and/or modify the software.
-
-  A secondary benefit of defending all users' freedom is that
-improvements made in alternate versions of the program, if they
-receive widespread use, become available for other developers to
-incorporate.  Many developers of free software are heartened and
-encouraged by the resulting cooperation.  However, in the case of
-software used on network servers, this result may fail to come about.
-The GNU General Public License permits making a modified version and
-letting the public access it on a server without ever releasing its
-source code to the public.
-
-  The GNU Affero General Public License is designed specifically to
-ensure that, in such cases, the modified source code becomes available
-to the community.  It requires the operator of a network server to
-provide the source code of the modified version running there to the
-users of that server.  Therefore, public use of a modified version, on
-a publicly accessible server, gives the public access to the source
-code of the modified version.
-
-  An older license, called the Affero General Public License and
-published by Affero, was designed to accomplish similar goals.  This is
-a different license, not a version of the Affero GPL, but Affero has
-released a new version of the Affero GPL which permits relicensing under
-this license.
-
-  The precise terms and conditions for copying, distribution and
-modification follow.
-
-                       TERMS AND CONDITIONS
-
-  0. Definitions.
-
-  "This License" refers to version 3 of the GNU Affero General Public License.
-
-  "Copyright" also means copyright-like laws that apply to other kinds of
-works, such as semiconductor masks.
-
-  "The Program" refers to any copyrightable work licensed under this
-License.  Each licensee is addressed as "you".  "Licensees" and
-"recipients" may be individuals or organizations.
-
-  To "modify" a work means to copy from or adapt all or part of the work
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 MIT License
 
-Copyright (c) 2018-2021 Microsoft Corporation, Daan Leijen
+Copyright (c) 2023 Rui Ueyama
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -703,289 +19,3 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
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-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-For the third-party/zlib component:
-
- (C) 1995-2022 Jean-loup Gailly and Mark Adler
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-  Jean-loup Gailly        Mark Adler
-  [email protected]          [email protected]

Makefile

@@ -1,254 +0,0 @@
-VERSION = 1.4.1
-
-PREFIX = /usr/local
-BINDIR = $(PREFIX)/bin
-LIBDIR = $(PREFIX)/lib
-LIBEXECDIR = $(PREFIX)/libexec
-MANDIR = $(PREFIX)/share/man
-DOCDIR = $(PREFIX)/share/doc
-
-INSTALL = install
-INSTALL_PROGRAM = $(INSTALL)
-INSTALL_DATA = $(INSTALL) -m 644
-
-OS := $(shell uname -s)
-ARCH := $(shell uname -m)
-
-ifeq ($(OS), Darwin)
-  TESTS := $(wildcard test/macho/*.sh)
-else
-  TESTS := $(wildcard test/elf/*.sh)
-endif
-
-D = $(DESTDIR)
-
-# CXX defaults to `g++`. Rewrite it with a vendor-neutral compiler
-# name `c++`.
-ifeq ($(origin CXX), default)
-  CXX = c++
-endif
-
-# If you want to keep symbols in the installed binary, run make with
-# `STRIP=true` to run /bin/true instead of the strip command.
-STRIP = strip
-
-SRCS = $(wildcard *.cc elf/*.cc macho/*.cc)
-OBJS = $(SRCS:%.cc=out/%.o) out/rust-demangle.o out/git-hash.o
-
-IS_ANDROID = 0
-ifneq ($(findstring -android,$(shell $(CC) -dumpmachine)),)
-  IS_ANDROID = 1
-endif
-
-# If you want to compile mold for debugging, invoke make as
-# `make CXXFLAGS=-g`.
-CFLAGS = -O2
-CXXFLAGS = -O2
-
-MOLD_CXXFLAGS := -std=c++20 -fno-exceptions -fno-unwind-tables \
-                 -fno-asynchronous-unwind-tables \
-                 -DMOLD_VERSION=\"$(VERSION)\" -DLIBDIR="\"$(LIBDIR)\""
-
-MOLD_LDFLAGS := -pthread -lz -lm -ldl
-
-LTO = 0
-ifeq ($(LTO), 1)
-  CXXFLAGS += -flto -O3
-  LDFLAGS  += -flto
-endif
-
-# By default, we want to use mimalloc as a memory allocator. mimalloc
-# is disabled on macOS and Android because it didn't work on those hosts.
-USE_MIMALLOC = 1
-ifeq ($(OS), Darwin)
-  USE_MIMALLOC = 0
-else ifeq ($(IS_ANDROID), 1)
-  USE_MIMALLOC = 0
-endif
-
-ifeq ($(USE_MIMALLOC), 1)
-  ifdef SYSTEM_MIMALLOC
-    MOLD_CXXFLAGS += -DUSE_SYSTEM_MIMALLOC
-    MOLD_LDFLAGS += -lmimalloc
-  else
-    MIMALLOC_LIB = out/mimalloc/libmimalloc.a
-    MOLD_CXXFLAGS += -Ithird-party/mimalloc/include
-    MOLD_LDFLAGS += -Wl,-whole-archive $(MIMALLOC_LIB) -Wl,-no-whole-archive
-  endif
-endif
-
-# Note: Do NOT specify `SYSTEM_TBB=1` unless your system-wide OneTBB
-# library is compiled with https://github.com/oneapi-src/oneTBB/pull/824.
-# mold with an unpatched OneTBB is unstable when doing LTO if the system
-# is under high load.
-ifdef SYSTEM_TBB
-  MOLD_LDFLAGS += -ltbb
-else
-  TBB_LIB = out/tbb/libs/libtbb.a
-  MOLD_LDFLAGS += $(TBB_LIB)
-  MOLD_CXXFLAGS += -Ithird-party/tbb/include
-endif
-
-ifeq ($(OS), Linux)
-  ifeq ($(IS_ANDROID), 0)
-    # glibc before 2.17 need librt for clock_gettime
-    MOLD_LDFLAGS += -Wl,-push-state -Wl,-as-needed -lrt -Wl,-pop-state
-  endif
-endif
-
-NEEDS_LIBCRYPTO = 1
-ifeq ($(OS), Darwin)
-  NEEDS_LIBCRYPTO = 0
-endif
-
-ifeq ($(NEEDS_LIBCRYPTO), 1)
-  MOLD_LDFLAGS += -lcrypto
-endif
-
-# '-latomic' flag is needed building on armv6/riscv64 systems.
-# Seems like '-atomic' would be better but not working.
-ifneq (,$(filter armv6% riscv64, $(ARCH)))
-  MOLD_LDFLAGS += -latomic
-endif
-
-# -Wc++11-narrowing is a fatal error on Android, so disable it.
-ifeq ($(IS_ANDROID), 1)
-  MOLD_CXXFLAGS += -Wno-c++11-narrowing
-endif
-
-ifeq ($(OS), Linux)
-  MOLD_WRAPPER_LDFLAGS = -Wl,-push-state -Wl,-no-as-needed -ldl -Wl,-pop-state
-endif
-
-DEPFLAGS = -MT $@ -MMD -MP -MF out/$*.d
-
-all: mold mold-wrapper.so
-
--include $(SRCS:%.cc=out/%.d)
-
-out/git-hash.cc: FORCE
-	./update-git-hash.py . out/git-hash.cc
-
-FORCE:
-
-out/git-hash.o: out/git-hash.cc
-	$(CXX) $(MOLD_CXXFLAGS) $(CXXFLAGS) -c -o $@ $<
-
-mold: $(OBJS) $(MIMALLOC_LIB) $(TBB_LIB)
-	$(CXX) $(OBJS) -o $@ $(MOLD_LDFLAGS) $(LDFLAGS)
-	ln -sf mold ld
-	ln -sf mold ld64
-
-mold-wrapper.so: elf/mold-wrapper.c
-	$(CC) $(DEPFLAGS) $(CFLAGS) -fPIC -shared -o $@ $< $(MOLD_WRAPPER_LDFLAGS) $(LDFLAGS)
-
-out/rust-demangle.o: third-party/rust-demangle/rust-demangle.c
-	$(CC) $(CFLAGS) -c -o $@ $<
-
-out/%.o: %.cc out/elf/.keep out/macho/.keep
-	$(CXX) $(MOLD_CXXFLAGS) $(DEPFLAGS) $(CXXFLAGS) -c -o $@ $<
-
-out/elf/.keep out/macho/.keep:
-	mkdir -p $(@D)
-	touch $@
-
-$(MIMALLOC_LIB):
-	mkdir -p out/mimalloc
-	(cd out/mimalloc; CFLAGS=-DMI_USE_ENVIRON=0 cmake -G'Unix Makefiles' ../../third-party/mimalloc)
-	$(MAKE) -C out/mimalloc mimalloc-static
-
-$(TBB_LIB):
-	mkdir -p out/tbb
-	(cd out/tbb; cmake -G'Unix Makefiles' -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_SHARED_LIBS=OFF -DTBB_TEST=OFF -DCMAKE_CXX_FLAGS="$(CXXFLAGS) -D__TBB_DYNAMIC_LOAD_ENABLED=0" -DTBB_STRICT=OFF ../../third-party/tbb)
-	$(MAKE) -C out/tbb tbb
-	(cd out/tbb; ln -sf *_relwithdebinfo libs)
-
-test tests check: all
-ifeq ($(OS), Darwin)
-	@$(MAKE) $(TESTS) --no-print-directory
-else
-	@$(MAKE) $(TESTS) --no-print-directory --output-sync
-endif
-
-	@if test -t 1; then \
-	  printf '\e[32mPassed all tests\e[0m\n'; \
-	else \
-	  echo 'Passed all tests'; \
-	fi
-
-test-arch:
-	TEST_CC=${TRIPLE}-gcc \
-	TEST_CXX=${TRIPLE}-g++ \
-	TEST_GCC=${TRIPLE}-gcc \
-	TEST_GXX=${TRIPLE}-g++ \
-	OBJDUMP=${TRIPLE}-objdump \
-	MACHINE=${MACHINE} \
-	QEMU="qemu-${MACHINE} -L /usr/${TRIPLE}" \
-	$(MAKE) test
-
-test-all: all
-	$(MAKE) test-arch TRIPLE=x86_64-linux-gnu MACHINE=x86_64
-	$(MAKE) test-arch TRIPLE=i686-linux-gnu MACHINE=i386
-	$(MAKE) test-arch TRIPLE=aarch64-linux-gnu MACHINE=aarch64
-	$(MAKE) test-arch TRIPLE=arm-linux-gnueabihf MACHINE=arm
-	$(MAKE) test-arch TRIPLE=riscv64-linux-gnu MACHINE=riscv64
-
-# macOS's GNU make hasn't been updated since 3.8.1 perhaps due a concern
-# of GPLv3. The --output-sync flag was introduced in GNU Make 4.0, so we
-# can't use that flag on macOS.
-#
-# `tail -r | tail -r` is a poor-man's way to enable full buffering on a
-# command output. `tail -r` outputs an input from the last line to the
-# first.
-$(TESTS):
-ifeq ($(OS), Darwin)
-	@set -o pipefail; ./$@ 2>&1 | tail -r | tail -r
-else
-	@./$@
-endif
-
-install: all
-	$(INSTALL) -d $D$(BINDIR)
-	$(INSTALL_PROGRAM) mold $D$(BINDIR)
-	$(STRIP) $D$(BINDIR)/mold
-
-	$(INSTALL) -d $D$(LIBDIR)/mold
-
-ifneq ($(OS), Darwin)
-	$(INSTALL_DATA) mold-wrapper.so $D$(LIBDIR)/mold
-	$(STRIP) $D$(LIBDIR)/mold/mold-wrapper.so
-endif
-
-	$(INSTALL) -d $D$(LIBEXECDIR)/mold
-
-# We want to make a symblink with a relative path, so that users can
-# move the entire directory to other place without breaking the reference.
-# GNU ln supports `--relative` to do that, but that's not supported by
-# non-GNU systems. So we use Python to compute a relative path.
-	ln -sf `python3 -c "import os.path; print(os.path.relpath('$(BINDIR)/mold', '$(LIBEXECDIR)/mold'))"` $D$(LIBEXECDIR)/mold/ld
-
-	$(INSTALL) -d $D$(MANDIR)/man1
-	$(INSTALL_DATA) docs/mold.1 $D$(MANDIR)/man1
-	ln -sf mold.1 $D$(MANDIR)/man1/ld.mold.1
-
-	$(INSTALL) -d $D$(DOCDIR)/mold
-	$(INSTALL_DATA) LICENSE $D$(DOCDIR)/mold/
-
-	ln -sf mold $D$(BINDIR)/ld.mold
-	ln -sf mold $D$(BINDIR)/ld64.mold
-
-uninstall:
-	rm -f $D$(BINDIR)/mold $D$(BINDIR)/ld.mold $D$(BINDIR)/ld64.mold
-	rm -f $D$(MANDIR)/man1/mold.1
-	rm -rf $D$(LIBDIR)/mold
-
-test-asan test-ubsan:
-	$(MAKE) USE_MIMALLOC=0 CXXFLAGS='-fsanitize=address -fsanitize=undefined -O0 -g' LDFLAGS='-fsanitize=address -fsanitize=undefined' test
-
-test-tsan:
-	$(MAKE) USE_MIMALLOC=0 CXXFLAGS='-fsanitize=thread -O0 -g' LDFLAGS=-fsanitize=thread test
-
-clean:
-	rm -rf *~ mold mold-wrapper.so out ld ld64 mold-*-linux.tar.gz
-
-.PHONY: all test tests check clean test-arch test-all test-asan test-ubsan test-tsan $(TESTS)

README.md

@@ -1,115 +1,117 @@
 # mold: A Modern Linker
 
-mold is a faster drop-in replacement for existing Unix linkers.
-It is several times faster than the LLVM lld linker, the second-fastest
-open-source linker which I originally created a few years ago.
-mold is designed to increase developer productivity by reducing
-build time, especially in rapid debug-edit-rebuild cycles.
+mold is a faster drop-in replacement for existing Unix linkers. It is several
+times quicker than the LLVM lld linker, the second-fastest open-source linker,
+which I initially developed a few years ago. mold aims to enhance developer
+productivity by minimizing build time, particularly in rapid
+debug-edit-rebuild cycles.
 
-Here is a performance comparison of GNU gold, LLVM lld, and mold for
-linking final debuginfo-enabled executables of major large programs
-on a simulated 8-core 16-threads machine.
+Here is a performance comparison of GNU ld, GNU gold, LLVM lld, and
+mold when linking final debuginfo-enabled executables for major large
+programs on a simulated 16-core, 32-thread machine.
 
-![Link speed comparison](docs/comparison.png)
+![Link speed comparison](docs/chart.svg)
 
-| Program (linker output size)  | GNU gold | LLVM lld | mold
-|-------------------------------|----------|----------|--------
-| Chrome 96 (1.89 GiB)          | 53.86s   | 11.74s   | 2.21s
-| Clang 13 (3.18 GiB)           | 64.12s   | 5.82s    | 2.90s
-| Firefox 89 libxul (1.64 GiB)  | 32.95s   | 6.80s    | 1.42s
+| Program (linker output size)  | GNU ld | GNU gold | LLVM lld | mold
+|-------------------------------|--------|----------|----------|------
+| MySQL 8.3 (0.47 GiB)          | 10.84s | 7.47s    | 1.64s    | 0.46s
+| Clang 19 (1.56 GiB)           | 42.07s | 33.13s   | 5.20s    | 1.35s
+| Chromium 124 (1.35 GiB)       | N/A    | 27.40s   | 6.10s    | 1.52s
 
-mold is so fast that it is only 2x _slower_ than `cp` on the same
-machine. Feel free to [file a bug](https://github.com/rui314/mold/issues)
-if you find mold is not faster than other linkers.
+mold is so fast that it is only 2x _slower_ than the `cp` command on the same
+machine. If you find that mold is not faster than other linkers, feel
+free to [file a bug report](https://github.com/rui314/mold/issues).
 
-mold currently supports x86-64, i386, ARM32, ARM64 and 64-bit RISC-V.
+mold supports x86-64, i386, ARM64, ARM32, 64-bit/32-bit little/big-endian
+RISC-V, 32-bit PowerPC, 64-bit big-endian PowerPC ELFv1, 64-bit little-endian
+PowerPC ELFv2, s390x, 64-bit/32-bit LoongArch, SPARC64, m68k, and SH-4.
 
-## Why does the speed of linking matter?
+## Why does linking speed matter?
 
-If you are using a compiled language such as C, C++ or Rust, a build
-consists of two phases. In the first phase, a compiler compiles
-source files into object files (`.o` files). In the second phase,
-a linker takes all object files to combine them into a single executable
-or a shared library file.
+If you are using a compiled language such as C, C++, or Rust, a build consists
+of two phases. In the first phase, a compiler compiles source files into
+object files (`.o` files). In the second phase, a linker takes all object
+files and combines them into a single executable or shared library file.
 
-The second phase takes a long time if your build output is large.
-mold can make it faster, saving your time and keeping you from being
-distracted while waiting for a long build to finish. The difference is
-most noticeable when you are in rapid debug-edit-rebuild cycles.
+The second phase can be time-consuming if your build output is large. mold can
+speed up this process, saving you time and preventing distractions while
+waiting for a lengthy build to finish. The difference is most noticeable
+during rapid debug-edit-rebuild cycles.
 
-## Install
+## Installation
 
-Binary packages for the following systems are currently available.
+Binary packages for the following systems are currently available:
 
 [![Packaging status](https://repology.org/badge/vertical-allrepos/mold.svg)](https://repology.org/project/mold/versions)
 
-## How to build
+## How to Build
 
-mold is written in C++20, so if you build mold yourself, you need a
-recent version of a C++ compiler and a C++ standard library. GCC 10.2
-or Clang 12.0.0 (or later) as well as libstdc++ 10 or libc++ 7 (or
-later) are recommended.
+mold is written in C++20, so if you build mold yourself, you will need a
+recent version of a C++ compiler and a C++ standard library. We recommend GCC
+10.2 or Clang 16.0.0 (or later) and libstdc++ 10 or libc++ 7 (or later).
 
-### Install dependencies
+### Install Dependencies
 
 To install build dependencies, run `./install-build-deps.sh` in this
-directory. It recognizes your Linux distribution and tries to install
-necessary packages. You may want to run it as root.
+directory. It will detect your Linux distribution and attempt to install the
+necessary packages. You may need to run it as root.
 
 ### Compile mold
 
 ```shell
-git clone https://github.com/rui314/mold.git
+git clone --branch stable https://github.com/rui314/mold.git
 cd mold
-git checkout v1.4.1
-make -j$(nproc) CXX=clang++
-sudo make install
+./install-build-deps.sh
+cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=c++ -B build
+cmake --build build -j$(nproc)
+sudo cmake --build build --target install
 ```
 
-You may need to pass a C++20 compiler command name to `make`.
-In the above case, `clang++` is passed. If it doesn't work for you,
-try a specific version of a compiler such as `g++-10` or `clang++-12`.
+You might need to pass a C++20 compiler command name to `cmake`. In the
+example above, `c++` is passed. If that doesn't work for you, try a specific
+version of a compiler, such as `g++-10` or `clang++-12`.
 
-By default, `mold` is installed to `/usr/local/bin`.
+By default, `mold` is installed to `/usr/local/bin`. You can change the
+installation location by passing `-DCMAKE_INSTALL_PREFIX=<directory>`.
+For other cmake options, see the comments in `CMakeLists.txt`.
 
-If you don't use a recent enough Linux distribution, or if for any reason
-`make` in the above commands doesn't work for you, you can use Docker to
-build it in a Docker environment. To do so, just run `./dist.sh` in this
-directory instead of running `make -j$(nproc)`. The shell script pulls a
-Docker image, builds mold and auxiliary files inside it, and packs
-them into a single tar file `mold-$version-$arch-linux.tar.gz`.
-You can extract the tar file anywhere and use `mold` executable in it.
+If you are not using a recent enough Linux distribution, or if `cmake` does
+not work for you for any reason, you can use Podman to build mold in a
+container. To do so, run `./dist.sh` in this directory instead of using
+`cmake`. The shell script will pull a container image, build mold and auxiliary
+files inside it, and package them into a single tar file named
+`dist/mold-$version-$arch-linux.tar.gz`. You can extract the tar file anywhere
+and use the mold executable in it.
 
 ## How to use
 
 <details><summary>A classic way to use mold</summary>
 
-On Unix, the linker command (which is usually `/usr/bin/ld`) is
-invoked indirectly by the compiler driver (which is usually `cc`,
-`gcc` or `clang`), which is typically in turn indirectly invoked by
-`make` or some other build system command.
+On Unix, the linker command (usually `/usr/bin/ld`) is indirectly invoked by
+the compiler driver (typically `cc`, `gcc`, or `clang`), which is in turn
+indirectly invoked by `make` or other build system commands.
 
-If you can specify an additional command line option to your compiler
-driver by modifying build system's config files, add one of the
-following flags to use `mold` instead of `/usr/bin/ld`:
+If you can specify an additional command line option for your compiler driver
+by modifying the build system's config files, add one of the following flags
+to use mold instead of `/usr/bin/ld`:
 
-- Clang: pass `-fuse-ld=mold`
+- For Clang: pass `-fuse-ld=mold`
 
-- GCC 12.1.0 or later: pass `-fuse-ld=mold`
+- For GCC 12.1.0 or later: pass `-fuse-ld=mold`
 
-- GCC before 12.1.0: `-fuse-ld` does not accept `mold` as a valid
-  argument, so you need to use `-B` option instead. `-B` is an option
-  to tell GCC where to look for external commands such as `ld`.
+- For GCC before 12.1.0: the `-fuse-ld` option does not accept `mold` as a
+  valid argument, so you need to use the `-B` option instead. The `-B` option
+  tells GCC where to look for external commands like `ld`.
 
-  If you have installed mold with `make install`, there should be a
-  directory named `/usr/libexec/mold` (or `/usr/local/libexec/mold`,
-  depending on your `$PREFIX`), and `ld` command should be there. The
-  `ld` is actually a symlink to `mold`. So, all you need is to pass
-  `-B/usr/libexec/mold` (or `-B/usr/local/libexec/mold`) to GCC.
+  If you have installed mold with `make install`, there should be a directory
+  named `/usr/libexec/mold` (or `/usr/local/libexec/mold`, depending on your
+  `$PREFIX`), and the `ld` command should be there. The `ld` is actually a
+  symlink to `mold`. So, all you need is to pass `-B/usr/libexec/mold` (or
+  `-B/usr/local/libexec/mold`) to GCC.
 
-If you haven't installed `mold` to any `$PATH`, you can still pass
-`-fuse-ld=/absolute/path/to/mold` to clang to use mold. GCC does not
-take an absolute path as an argument for `-fuse-ld` though.
+If you haven't installed `ld.mold` to any `$PATH`, you can still pass
+`-fuse-ld=/absolute/path/to/mold` to clang to use mold. However, GCC does not
+accept an absolute path as an argument for `-fuse-ld`.
 
 </details>
 
@@ -117,66 +119,84 @@ take an absolute path as an argument for `-fuse-ld` though.
 
 Create `.cargo/config.toml` in your project directory with the following:
 
-```
-[target.x86_64-unknown-linux-gnu]
+```toml
+[target.'cfg(target_os = "linux")']
 linker = "clang"
 rustflags = ["-C", "link-arg=-fuse-ld=/path/to/mold"]
 ```
 
-where `/path/to/mold` is an absolute path to `mold` exectuable.
-Please make sure you have installed `clang`.
+where `/path/to/mold` is an absolute path to the mold executable. In the
+example above, we use `clang` as a linker driver since it always accepts the
+`-fuse-ld` option. If your GCC is recent enough to recognize the option, you
+may be able to remove the `linker = "clang"` line.
 
-If you want to use mold for all projects, put the above snippet to
+```toml
+[target.'cfg(target_os = "linux")']
+rustflags = ["-C", "link-arg=-fuse-ld=mold"]
+```
+
+If you want to use mold for all projects, add the above snippet to
 `~/.cargo/config.toml`.
 
 </details>
 
+<details><summary>If you are using Nim</summary>
+
+Create `config.nims` in your project directory with the following:
+
+```nim
+when findExe("mold").len > 0 and defined(linux):
+  switch("passL", "-fuse-ld=mold")
+```
+
+where `mold` must be included in the `PATH` environment variable. In this
+example, `gcc` is used as the linker driver. Use the `-fuse-ld` option if your
+GCC is recent enough to recognize this option.
+
+If you want to use mold for all projects, add the above snippet to
+`~/.config/config.nims`.
+
+</details>
+
+<details><summary>If you are using Conan package manager</summary>
+
+You can configure [Conan](https://github.com/conan-io) to download the latest
+version of `mold` and use it as the linker when building your dependencies and
+projects from source. Please see the instructions [here](https://conan.io/center/recipes/mold).
+
+</details>
+
 <details><summary>mold -run</summary>
 
-It is sometimes very hard to pass an appropriate command line option
-to `cc` to specify an alternative linker.  To deal with the situation,
-mold has a feature to intercept all invocations of `ld`, `ld.lld` or
-`ld.gold` and redirect it to itself. To use the feature, run `make`
-(or another build command) as a subcommand of mold as follows:
+It is sometimes very hard to pass an appropriate command line option to `cc`
+to specify an alternative linker. To address this situation, mold has a
+feature to intercept all invocations of `ld`, `ld.bfd`, `ld.lld`, or `ld.gold`
+and redirect them to itself. To use this feature, run `make` (or another build
+command) as a subcommand of mold as follows:
 
 ```shell
 mold -run make <make-options-if-any>
 ```
 
-Internally, mold invokes a given command with `LD_PRELOAD` environment
-variable set to its companion shared object file. The shared object
-file intercepts all function calls to `exec(3)`-family functions to
-replace `argv[0]` with `mold` if it is `ld`, `ld.gold` or `ld.lld`.
-
-</details>
-
-<details><summary>On macOS</summary>
-
-mold/macOS is available as an alpha version. It can be used to build not
-only macOS apps but also iOS apps because their binary formats are the same.
-
-The command name of mold/macOS is `ld64.mold`. If you build mold on macOS,
-it still produces `mold` and `ld.mold`, but these executables are useful
-only for cross compilation (i.e. building Linux apps on macOS.)
-
-If you find any issue with mold/macOS, please file it to
-<a href=https://github.com/rui314/mold/issues>our GitHub Issues</a>.
+Internally, mold invokes a given command with the `LD_PRELOAD` environment
+variable set to its companion shared object file. The shared object file
+intercepts all function calls to `exec(3)`-family functions to replace
+`argv[0]` with `mold` if it is `ld`, `ld.bf`, `ld.gold`, or `ld.lld`.
 
 </details>
 
 <details><summary>GitHub Actions</summary>
 
-You can use our <a href=https://github.com/rui314/setup-mold>setup-mold</a>
-GitHub Action to speed up GitHub-hosted continuous build. GitHub Actions
-runs on a two-core machine, but mold is still significantly faster than
-the default GNU linker there especially when a program being linked is
-large.
+You can use our [setup-mold](https://github.com/rui314/setup-mold) GitHub
+Action to speed up GitHub-hosted continuous builds. Although GitHub Actions
+run on a 4 core machine, mold is still significantly faster than the default
+GNU linker, especially when linking large programs.
 
 </details>
 
 <details><summary>Verify that you are using mold</summary>
 
-mold leaves its identification string in `.comment` section in an output
+mold leaves its identification string in the `.comment` section of an output
 file. You can print it out to verify that you are actually using mold.
 
 ```shell
@@ -187,66 +207,69 @@ String dump of section '.comment':
   [    2b]  mold 9a1679b47d9b22012ec7dfbda97c8983956716f7
 ```
 
-If `mold` is in `.comment`, the file is created by mold.
+If `mold` is present in the `.comment` section, the file was created by mold.
 
 </details>
 
 <details><summary>Online manual</summary>
 
-Since mold is a drop-in replacement, you should be able to use it
-without reading its manual. But just in case you need it, it's available
-online at <a href=https://rui314.github.io/mold.html>here</a>.
-You can also read the same manual by `man mold`.
+Since mold is a drop-in replacement, you should be able to use it without
+reading its manual. However, if you need it, [mold's man page](docs/mold.md)
+is available online. You can read the same manual by running `man mold`.
 
 </details>
 
 ## Why is mold so fast?
 
-One reason is because it simply uses faster algorithms and efficient
-data structures than other linkers do. The other reason is that the
-new linker is highly parallelized.
+One reason is that it utilizes faster algorithms and more efficient data
+structures compared to other linkers. Another reason is that mold is highly
+parallelized.
 
-Here is a side-by-side comparison of per-core CPU usage of lld (left)
-and mold (right). They are linking the same program, Chromium
-executable.
+Here is a side-by-side comparison of per-core CPU usage for lld (left) and
+mold (right), linking the same program, a Chromium executable.
 
 ![CPU usage comparison in htop animation](docs/htop.gif)
 
-As you can see, mold uses all available cores throughout its execution
-and finishes quickly. On the other hand, lld failed to use available
-cores most of the time. In this demo, the maximum parallelism is
-artificially capped to 16 so that the bars fit in the GIF.
+As you can see, mold uses all available cores throughout its execution and
+finishes quickly. In contrast, lld fails to utilize available cores most of
+the time. In this demo, the maximum parallelism is artificially capped at 16,
+so that the bars fit in the GIF.
 
-For details, please read [design notes](docs/design.md).
+For details, please see the [design notes](docs/design.md).
 
-## License
+## Sponsors
 
-mold is available under AGPL. Note that that does not mean that you
-have to license your program under AGPL if you use mold to link your
-program. An output of the mold linker is a derived work of the object
-files and libraries you pass to the linker but not a derived work of
-the mold linker itself.
+It is taken for granted nowadays that compiler toolchains can be easily
+installed and used for free, and people may not think too much about the
+individuals behind these "free tools". mold supports many projects, but it
+is essentially a one-person project. This situation is similar to the one
+depicted in the following xkcd illustration.
 
-Besides that, you can also buy a commercial, non-AGPL license with
-technical support from our company, Blue Whale Systems PTE LTD. If you
-are a big company, please consider obtaining it before making hundreds
-or thousands of developers of your company to depend on mold. mold is
-mostly a single-person open-source project, and just like other
-open-source projects, we are not legally obligated to keep maintaining
-it. A legally-binding commercial license contract addresses the
-concern. By purchasing a license, you are guaranteed that mold will be
-maintained for you. Please [contact us](mailto:[email protected])
-for a commercial license inquiry.
+[![xkcd 2347](https://imgs.xkcd.com/comics/dependency.png)](https://xkcd.com/2347)
 
-## Acknowledgement
+If you think that the "Nebraska guy" should be rewarded, please consider
+becoming our [GitHub sponsor](https://github.com/sponsors/rui314)!
 
-We accept donations via [GitHub Sponsors](https://github.com/sponsors/rui314)
-and [OpenCollective](https://opencollective.com/mold-linker).
-We thank you to everybody who sponsors our project. In particular,
-we'd like to acknowledge the following people and organizations who
-have sponsored $128/month or more:
+We thank everyone who sponsors our project. In particular, we'd like to acknowledge
+the following people and organizations who have sponsored $128/month or more:
 
-- [300baud](https://github.com/300baud)
-- [Mercury](https://github.com/MercuryTechnologies)
-- [Wei Wu](https://github.com/lazyparser)
+### Corporate sponsors
+
+<a href="https://mercury.com"><img src="docs/mercury-logo.png" align=center height=120 width=400 alt=Mercury></a>
+
+<a href="https://cybozu-global.com"><img src="docs/cyboze-logo.png" align=center height=120 width=133 alt=Cybozu></a>
+
+<a href="https://www.emergetools.com"><img src="docs/emerge-tools-logo.png" align=center height=120 width=240 alt="Emerge Tools"></a><br>
+
+- [G-Research](https://www.gresearch.co.uk)
 - [Signal Slot Inc.](https://github.com/signal-slot)
+- [GlareDB](https://github.com/GlareDB)
+
+### Individual sponsors
+
+- [Wei Wu](https://github.com/lazyparser)
+- [kyle-elliott](https://github.com/kyle-elliott)
+- [Bryant Biggs](https://github.com/bryantbiggs)
+- [kraptor23](https://github.com/kraptor23)
+- [Jinkyu Yi](https://github.com/jincreator)
+- [Pedro Navarro](https://github.com/pedronavf)

cmdline.h

@@ -1,76 +0,0 @@
-#pragma once
-
-#include "mold.h"
-
-namespace mold {
-
-template <typename C>
-std::vector<std::string_view>
-read_response_file(C &ctx, std::string_view path) {
-  std::vector<std::string_view> vec;
-  MappedFile<C> *mf = MappedFile<C>::must_open(ctx, std::string(path));
-  u8 *data = mf->data;
-
-  auto read_quoted = [&](i64 i, char quote) {
-    std::string buf;
-    while (i < mf->size && data[i] != quote) {
-      if (data[i] == '\\') {
-        buf.append(1, data[i + 1]);
-        i += 2;
-      } else {
-        buf.append(1, data[i++]);
-      }
-    }
-    if (i >= mf->size)
-      Fatal(ctx) << path << ": premature end of input";
-    vec.push_back(save_string(ctx, buf));
-    return i + 1;
-  };
-
-  auto read_unquoted = [&](i64 i) {
-    std::string buf;
-    while (i < mf->size && !isspace(data[i]))
-      buf.append(1, data[i++]);
-    vec.push_back(save_string(ctx, buf));
-    return i;
-  };
-
-  for (i64 i = 0; i < mf->size;) {
-    if (isspace(data[i]))
-      i++;
-    else if (data[i] == '\'')
-      i = read_quoted(i + 1, '\'');
-    else if (data[i] == '\"')
-      i = read_quoted(i + 1, '\"');
-    else
-      i = read_unquoted(i);
-  }
-  return vec;
-}
-
-// Replace "@path/to/some/text/file" with its file contents.
-template <typename C>
-std::vector<std::string_view> expand_response_files(C &ctx, char **argv) {
-  std::vector<std::string_view> vec;
-  for (i64 i = 0; argv[i]; i++) {
-    if (argv[i][0] == '@')
-      append(vec, read_response_file(ctx, argv[i] + 1));
-    else
-      vec.push_back(argv[i]);
-  }
-  return vec;
-}
-
-static inline std::string_view string_trim(std::string_view str) {
-  size_t pos = str.find_first_not_of(" \t");
-  if (pos == str.npos)
-    return "";
-  str = str.substr(pos);
-
-  pos = str.find_last_not_of(" \t");
-  if (pos == str.npos)
-    return str;
-  return str.substr(0, pos + 1);
-}
-
-} // namespace mold

compress.cc

@@ -1,193 +0,0 @@
-// This file implements a multi-threaded zlib compression routine.
-//
-// Multiple pieces of raw compressed data in zlib-format can be merged
-// just by concatenation as long as each zlib stream is flushed with
-// Z_SYNC_FLUSH. In this file, we split input data into multiple
-// shards, compress them individually and concatenate them. We then
-// append a header, a trailer and a checksum so that the concatenated
-// data is valid zlib-format data.
-//
-// Using threads to compress data has a downside. Since the dictionary
-// is reset on boundaries of shards, compression ratio is sacrificed
-// a little bit. However, if a shard size is large enough, that loss
-// is negligible in practice.
-
-#include "mold.h"
-
-#include <tbb/parallel_for_each.h>
-#include <zlib.h>
-
-#define CHECK(fn) do { int r = (fn); assert(r == Z_OK); } while (0)
-
-namespace mold {
-
-static constexpr i64 SHARD_SIZE = 1024 * 1024;
-
-static std::vector<std::string_view> split(std::string_view input) {
-  std::vector<std::string_view> shards;
-
-  while (input.size() >= SHARD_SIZE) {
-    shards.push_back(input.substr(0, SHARD_SIZE));
-    input = input.substr(SHARD_SIZE);
-  }
-  if (!input.empty())
-    shards.push_back(input);
-  return shards;
-}
-
-static std::vector<u8> do_compress(std::string_view input) {
-  // Initialize zlib stream. Since debug info is generally compressed
-  // pretty well with lower compression levels, we chose compression
-  // level 1.
-  z_stream strm;
-  strm.zalloc = Z_NULL;
-  strm.zfree = Z_NULL;
-  strm.opaque = Z_NULL;
-
-  CHECK(deflateInit2(&strm, 1, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY));
-
-  // Set an input buffer
-  strm.avail_in = input.size();
-  strm.next_in = (u8 *)input.data();
-
-  // Set an output buffer. deflateBound() returns an upper bound
-  // on the compression size. +16 for Z_SYNC_FLUSH.
-  std::vector<u8> buf(deflateBound(&strm, strm.avail_in) + 16);
-
-  // Compress data. It writes all compressed bytes except the last
-  // partial byte, so up to 7 bits can be held to be written to the
-  // buffer.
-  strm.avail_out = buf.size();
-  strm.next_out = buf.data();
-  CHECK(deflate(&strm, Z_BLOCK));
-
-  // This is a workaround for libbacktrace before 2022-04-06.
-  //
-  // Zlib is a bit stream, and what Z_SYNC_FLUSH does is to write a
-  // three bit value indicating the start of an uncompressed data
-  // block followed by four byte data 00 00 ff ff which indicates that
-  // the length of the block is zero. libbacktrace uses its own zlib
-  // inflate routine, and it had a bug that if that particular three
-  // bit value happens to end at a byte boundary, it accidentally
-  // skipped the next byte.
-  //
-  // In order to avoid triggering that bug, we should avoid calling
-  // deflate() with Z_SYNC_FLUSH if the current bit position is 5.
-  // If it's 5, we insert an empty block consisting of 10 bits so
-  // that the bit position is 7 in the next byte.
-  //
-  // https://github.com/ianlancetaylor/libbacktrace/pull/87
-  int nbits;
-  deflatePending(&strm, Z_NULL, &nbits);
-  if (nbits == 5)
-    CHECK(deflatePrime(&strm, 10, 2));
-  CHECK(deflate(&strm, Z_SYNC_FLUSH));
-
-  assert(strm.avail_out > 0);
-  buf.resize(buf.size() - strm.avail_out);
-  deflateEnd(&strm);
-  return buf;
-}
-
-ZlibCompressor::ZlibCompressor(u8 *buf, i64 size) {
-  std::string_view input{(char *)buf, (size_t)size};
-  std::vector<std::string_view> inputs = split(input);
-  std::vector<u64> adlers(inputs.size());
-  shards.resize(inputs.size());
-
-  // Compress each shard
-  tbb::parallel_for((i64)0, (i64)inputs.size(), [&](i64 i) {
-    adlers[i] = adler32(1, (u8 *)inputs[i].data(), inputs[i].size());
-    shards[i] = do_compress(inputs[i]);
-  });
-
-  // Combine checksums
-  checksum = adlers[0];
-  for (i64 i = 1; i < inputs.size(); i++)
-    checksum = adler32_combine(checksum, adlers[i], inputs[i].size());
-}
-
-i64 ZlibCompressor::size() const {
-  i64 size = 2;    // +2 for header
-  for (const std::vector<u8> &shard : shards)
-    size += shard.size();
-  return size + 6; // +6 for trailer and checksum
-}
-
-void ZlibCompressor::write_to(u8 *buf) {
-  // Write a zlib-format header
-  buf[0] = 0x78;
-  buf[1] = 0x9c;
-
-  // Copy compressed data
-  std::vector<i64> offsets(shards.size());
-  offsets[0] = 2; // +2 for header
-  for (i64 i = 1; i < shards.size(); i++)
-    offsets[i] = offsets[i - 1] + shards[i - 1].size();
-
-  tbb::parallel_for((i64)0, (i64)shards.size(), [&](i64 i) {
-    memcpy(&buf[offsets[i]], shards[i].data(), shards[i].size());
-  });
-
-  // Write a trailer
-  u8 *end = buf + size();
-  end[-6] = 3;
-  end[-5] = 0;
-
-  // Write a checksum
-  *(ub32 *)(end - 4) = checksum;
-}
-
-GzipCompressor::GzipCompressor(std::string_view input) {
-  std::vector<std::string_view> inputs = split(input);
-  std::vector<u32> crc(inputs.size());
-  shards.resize(inputs.size());
-
-  // Compress each shard
-  tbb::parallel_for((i64)0, (i64)inputs.size(), [&](i64 i) {
-    crc[i] = crc32(0, (u8 *)inputs[i].data(), inputs[i].size());
-    shards[i] = do_compress(inputs[i]);
-  });
-
-  // Combine checksums
-  checksum = crc[0];
-  for (i64 i = 1; i < inputs.size(); i++)
-    checksum = crc32_combine(checksum, crc[i], inputs[i].size());
-
-  uncompressed_size = input.size();
-}
-
-i64 GzipCompressor::size() const {
-  i64 size = 10;    // +10 for header
-  for (const std::vector<u8> &shard : shards)
-    size += shard.size();
-  return size + 10; // +10 for trailer and checksum
-}
-
-void GzipCompressor::write_to(u8 *buf) {
-  // Write a zlib-format header
-  memset(buf, 0, 10);
-  buf[0] = 0x1f; // magic
-  buf[1] = 0x8b; // magic
-  buf[2] = 0x08; // compression method is zlib
-  buf[9] = 0xff; // made on unknown OS
-
-  // Copy compressed data
-  std::vector<i64> offsets(shards.size());
-  offsets[0] = 10; // +10 for header
-  for (i64 i = 1; i < shards.size(); i++)
-    offsets[i] = offsets[i - 1] + shards[i - 1].size();
-
-  tbb::parallel_for((i64)0, (i64)shards.size(), [&](i64 i) {
-    memcpy(&buf[offsets[i]], shards[i].data(), shards[i].size());
-  });
-
-  // Write a trailer
-  u8 *end = buf + size();
-  end[-10] = 3; // two-byte zlib stream terminator
-  end[-9] = 0;
-  *(ul32 *)(end - 8) = checksum;
-  *(ul32 *)(end - 4) = uncompressed_size;
-}
-
-} // namespace mold

demangle.cc

@@ -1,51 +0,0 @@
-#include "mold.h"
-
-#include <cstdlib>
-
-#ifndef _WIN32
-#include <cxxabi.h>
-#endif
-
-#include "third-party/rust-demangle/rust-demangle.h"
-
-namespace mold {
-
-std::string_view demangle(std::string_view name) {
-  static thread_local char *p;
-  if (p)
-    free(p);
-
-  // Try to demangle as a Rust symbol. Since legacy-style Rust symbols
-  // are also valid as a C++ mangled name, we need to call this before
-  // cpp_demangle.
-  p = rust_demangle(std::string(name).c_str(), 0);
-  if (p)
-    return p;
-
-  // Try to demangle as a C++ symbol.
-  if (std::optional<std::string_view> s = cpp_demangle(name))
-    return *s;
-  return name;
-}
-
-std::optional<std::string_view> cpp_demangle(std::string_view name) {
-  static thread_local char *buf;
-  static thread_local size_t buflen;
-
-  // TODO(cwasser): Actually demangle Symbols on Windows using e.g.
-  // `UnDecorateSymbolName` from Dbghelp, maybe even Itanium symbols?
-#ifndef _WIN32
-  if (name.starts_with("_Z")) {
-    int status;
-    char *p = abi::__cxa_demangle(std::string(name).c_str(), buf, &buflen, &status);
-    if (status == 0) {
-      buf = p;
-      return p;
-    }
-  }
-#endif
-
-  return {};
-}
-
-} // namespace mold

dist.sh

@@ -1,35 +1,247 @@
-#!/bin/bash -x
-# This script creates a mold binary distribution. The output is
-# written in this directory as `mold-$version-$arch-linux.tar.gz`
-# (e.g. `mold-1.0.3-x86_64-linux.tar.gz`).
+#!/bin/bash
 #
-# The mold executable created by this script is statically-linked to
-# libstdc++ and libcrypto but dynamically-linked to libc, libm, libz
-# and librt, as they almost always exist on any Linux systems.
+# This script creates a mold binary distribution. The output is written to
+# the `dist` directory as `mold-$version-$arch-linux.tar.gz` (e.g.
+# `mold-2.40.0-x86_64-linux.tar.gz`).
+#
+# This script aims to produce reproducible outputs. That means each time
+# it's run on the same git commit, it generates a bit-for-bit identical
+# binary file regardless of when or where it's executed. This property
+# serves as a strong safeguard against supply chain attacks. With a
+# reproducible build, anyone can independently verify that the binary
+# files published on our GitHub release page were built from the git
+# commit tagged for release by rebuilding the binaries themselves.
+#
+# Debian provides snapshot.debian.org to host all historical binary
+# packages. We use it to construct a container image pinned to a
+# particular timestamp. snapshot.debian.org is known to be very slow,
+# but that shouldn't be a big problem for us because we only need that
+# site the first time.
+#
+# The mold executable created by this script is statically linked to
+# libstdc++, but dynamically linked to glibc, libm and a few other
+# libraries, as these libraries are almost always available on any Linux
+# system. We can't statically link glibc because doing so would disable
+# dlopen(), which is required to load the LTO linker plugin.
+#
+# We use a reasonably old Debian version for the build environment because
+# a binary dynamically linked against a newer version of glibc won't work
+# on a system with an older version of glibc.
+#
+# We prefer to build mold with Clang rather than GCC because mold's
+# Identical Code Folding works best with the LLVM address significance
+# table (.llvm_addrsig). Building a release binary with GCC produces a
+# slightly larger binary than with Clang.
+#
+# We need a recent version of Clang to build mold. If it's not available
+# via apt-get, we'll build it ourselves.
+#
+# This script can be used to create non-native binaries (e.g., building
+# aarch64 binary on x86-64) because Podman automatically runs everything
+# under QEMU if the container image is not native. To use this script for
+# non-native builds, you may need to install the qemu-user-static package.
 
-set -e
+set -e -x
+cd "$(dirname $0)"
 
-# Unlike Linux, macOS's uname returns arm64 for aarch64.
-arch=$(uname -m)
-[ $arch = arm64 ] && arch=aarch64
-
-if [ $arch != x86_64 -a $arch != aarch64 ]; then
-  echo "Error: no docker image for $arch"
+usage() {
+  echo "Usage: $0 [ x86_64 | aarch64 | arm | riscv64 | ppc64le | s390x | loongarch64 ]"
   exit 1
+}
+
+case $# in
+0)
+  arch=$(uname -m)
+  if [ $arch = arm64 ]; then
+    arch=aarch64
+  elif [[ $arch = arm* ]]; then
+    arch=arm
+  fi
+  ;;
+1)
+  arch="$1"
+  ;;
+*)
+  usage
+esac
+
+# Create a Podman image.
+if [ "$GITHUB_REPOSITORY" = '' ]; then
+  image=mold-builder-$arch
+  image_build="podman build --arch $arch -t $image -"
+else
+  # If this script is running on GitHub Actions, we want to cache
+  # the created container image in GitHub's container repostiory.
+  image=ghcr.io/$GITHUB_REPOSITORY/mold-builder-$arch
+  image_build="podman build --arch $arch -t $image --output=type=registry --layers --cache-to $image --cache-from $image -"
 fi
 
-version=$(grep '^VERSION =' $(dirname $0)/Makefile | sed 's/.* = //')
+case $arch in
+x86_64)
+  # Debian 9 (Stretch) released in June 2017.
+  #
+  # We use a Google-provided mirror (gcr.io) instead of the official Docker
+  # Hub (docker.io) because docker.io has a strict rate limit policy.
+  #
+  # The toolchain in Debian 9 is too old to build mold, so we rebuild it
+  # from source. We download source archives from official sites and build
+  # them locally, rather than downloading pre-built binaries from somewhere
+  # else, to avoid relying on unverifiable third-party binary blobs. Podman
+  # caches the result of each RUN command, so rebuilding is done only once
+  # per host.
+  cat <<EOF | $image_build
+FROM mirror.gcr.io/library/debian:stretch@sha256:c5c5200ff1e9c73ffbf188b4a67eb1c91531b644856b4aefe86a58d2f0cb05be
+ENV DEBIAN_FRONTEND=noninteractive TZ=UTC
+RUN sed -i -e '/^deb/d' -e 's/^# deb /deb /g' /etc/apt/sources.list && \
+  echo 'Acquire::Retries "10"; Acquire::http::timeout "10"; Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/80-retries && \
+  apt-get update && \
+  apt-get install -y --no-install-recommends wget file make gcc g++ zlib1g-dev libssl-dev ca-certificates && \
+  rm -rf /var/lib/apt/lists
+
+# Build CMake 3.27
+RUN mkdir /build && \
+  cd /build && \
+  wget -O- --progress=dot:mega https://cmake.org/files/v3.27/cmake-3.27.7.tar.gz | tar xzf - --strip-components=1 && \
+  ./bootstrap --parallel=\$(nproc) && \
+  make -j\$(nproc) && \
+  make install && \
+  rm -rf /build
+
+# Build GCC 14
+RUN mkdir /build && \
+  cd /build && \
+  wget -O- --progress=dot:mega https://ftpmirror.gnu.org/gcc/gcc-14.2.0/gcc-14.2.0.tar.gz | tar xzf - --strip-components=1 && \
+  mkdir gmp mpc mpfr && \
+  wget -O- --progress=dot:mega https://ftpmirror.gnu.org/gmp/gmp-6.3.0.tar.gz | tar xzf - --strip-components=1 -C gmp && \
+  wget -O- --progress=dot:mega https://ftpmirror.gnu.org/mpc/mpc-1.3.1.tar.gz | tar xzf - --strip-components=1 -C mpc && \
+  wget -O- --progress=dot:mega https://ftpmirror.gnu.org/mpfr/mpfr-4.2.1.tar.gz | tar xzf - --strip-components=1 -C mpfr && \
+  ./configure --prefix=/usr --enable-languages=c,c++ --disable-bootstrap --disable-multilib && \
+  make -j\$(nproc) && \
+  make install && \
+  ln -sf /usr/lib64/libstdc++.so.6 /usr/lib/x86_64-linux-gnu/libstdc++.so.6 && \
+  rm -rf /build
+
+# Build GNU binutils 2.43
+RUN mkdir /build && \
+  cd /build && \
+  wget -O- --progress=dot:mega https://ftpmirror.gnu.org/binutils/binutils-2.43.tar.gz | tar xzf - --strip-components=1 && \
+  ./configure --prefix=/usr && \
+  make -j\$(nproc) && \
+  make install && \
+  rm -fr /build
+
+# Build Python 3.12.7
+RUN mkdir /build && \
+  cd /build && \
+  wget -O- --progress=dot:mega https://www.python.org/ftp/python/3.12.7/Python-3.12.7.tgz | tar xzf - --strip-components=1 && \
+  ./configure && \
+  make -j\$(nproc) && \
+  make install && \
+  rm -rf /build
+
+# Build LLVM 20
+RUN mkdir /build && \
+  cd /build && \
+  wget -O- --progress=dot:mega https://github.com/llvm/llvm-project/archive/refs/tags/llvmorg-20.1.3.tar.gz | tar xzf - --strip-components=1 && \
+  mkdir b && \
+  cd b && \
+  cmake -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS=clang ../llvm && \
+  cmake --build . -j\$(nproc) && \
+  cmake --install . --strip && \
+  rm -rf /build
+EOF
+  ;;
+aarch64 | arm | ppc64le | s390x)
+  # Debian 11 (Bullseye) released in August 2021
+  #
+  # We don't want to build Clang for these targets on QEMU becuase it
+  # would take an extremely long time. Also, I believe old Linux boxes
+  # are typically x86-64.
+  cat <<EOF | $image_build
+FROM mirror.gcr.io/library/debian:bullseye-20240904@sha256:8ccc486c29a3ad02ad5af7f1156e2152dff3ba5634eec9be375269ef123457d8
+ENV DEBIAN_FRONTEND=noninteractive TZ=UTC
+RUN sed -i -e '/^deb/d' -e 's/^# deb /deb /g' /etc/apt/sources.list && \
+  echo 'Acquire::Retries "10"; Acquire::http::timeout "10"; Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/80-retries && \
+  apt-get update && \
+  apt-get install -y --no-install-recommends build-essential gcc-10 g++-10 clang-16 cmake && \
+  ln -sf /usr/bin/clang-16 /usr/bin/clang && \
+  ln -sf /usr/bin/clang++-16 /usr/bin/clang++ && \
+  rm -rf /var/lib/apt/lists
+EOF
+  ;;
+riscv64)
+  cat <<EOF | $image_build
+FROM mirror.gcr.io/riscv64/debian:unstable-20240926@sha256:25654919c2926f38952cdd14b3300d83d13f2d820715f78c9f4b7a1d9399bf48
+ENV DEBIAN_FRONTEND=noninteractive TZ=UTC
+RUN sed -i -e '/^URIs/d' -e 's/^# http/URIs: http/' /etc/apt/sources.list.d/debian.sources && \
+  echo 'Acquire::Retries "10"; Acquire::http::timeout "10"; Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/80-retries && \
+  apt-get update && \
+  apt-get install -y --no-install-recommends build-essential gcc-14 g++-14 clang-18 cmake && \
+  ln -sf /usr/bin/clang-18 /usr/bin/clang && \
+  ln -sf /usr/bin/clang++-18 /usr/bin/clang++ && \
+  rm -rf /var/lib/apt/lists
+EOF
+  ;;
+loongarch64)
+  cat <<EOF | $image_build
+FROM mirror.gcr.io/loongarch64/debian:sid@sha256:0356df4e494bbb86bb469377a00789a5b42bbf67d5ff649a3f9721b745cbef77
+ENV DEBIAN_FRONTEND=noninteractive TZ=UTC
+RUN sed -i -e 's!http[^ ]*!http://snapshot.debian.org/archive/debian-ports/20250620T014755Z!g' /etc/apt/sources.list && \
+  echo 'Acquire::Retries "10"; Acquire::http::timeout "10"; Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/80-retries && \
+  apt-get update && \
+  apt-get install -y --no-install-recommends build-essential gcc-14 g++-14 clang-19 cmake && \
+  ln -sf /usr/bin/clang-19 /usr/bin/clang && \
+  ln -sf /usr/bin/clang++-19 /usr/bin/clang++ && \
+  rm -rf /var/lib/apt/lists
+EOF
+  ;;
+*)
+  usage
+  ;;
+esac
+
+version=$(sed -n 's/^project(mold VERSION \(.*\))/\1/p' CMakeLists.txt)
 dest=mold-$version-$arch-linux
-image=rui314/mold-builder:v1-$arch
 
-docker images -q $image 2> /dev/null || docker pull $image
+# Source tarballs available on GitHub don't contain .git directory.
+# Clone the repo if missing.
+[ -d .git ] || git clone --branch v$version --depth 1 --bare https://github.com/rui314/mold .git
 
-docker run -it --rm -v "$(pwd):/mold" -e "OWNER=$(id -u):$(id -g)" $image \
-  bash -c "mkdir /tmp/build &&
-cd /tmp/build &&
-cmake -DCMAKE_C_COMPILER=gcc-10 -DCMAKE_CXX_COMPILER=g++-10 -DMOLD_MOSTLY_STATIC=On -DCMAKE_BUILD_TYPE=Release /mold &&
+# We use the timestamp of the last Git commit as the file timestamp
+# for build artifacts.
+timestamp=$(git log -1 --format=%ct)
+
+# `uname -m` in an ARM32 container running on an ARM64 host reports it
+# not as ARM32 but as ARM64. That confuses BLAKE3's cmake script and
+# erroneously enables NEON SIMD instructions. `setarch` can be used to
+# change the output of `uname -m`.
+setarch=
+[ $arch = arm ] && setarch='setarch linux32'
+
+mkdir -p dist
+
+# Build mold in a container.
+#
+# SOURCE_DATE_EPOCH is a standardized environment variable that allows
+# build artifacts to appear as if they were built at a specific time.
+# We use it to control how the compiler expands the C/C++ __DATE__ and
+# __TIME__ macros.
+podman run --arch $arch -it --rm --userns=host --pids-limit=-1 --network=none \
+  --pull=never -v "$(pwd):/mold:ro" -v "$(pwd)/dist:/dist" $image \
+   $setarch bash -c "
+set -e
+export SOURCE_DATE_EPOCH=$timestamp
+mkdir /build
+cd /build
+cmake -DCMAKE_BUILD_TYPE=Release -DMOLD_MOSTLY_STATIC=1 -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ /mold
 cmake --build . -j\$(nproc)
+cmake --install .
+cmake -DMOLD_USE_MOLD=1 .
+cmake --build . -j\$(nproc)
+ctest --output-on-failure -j\$(nproc)
 cmake --install . --prefix $dest --strip
-tar czf /mold/$dest.tar.gz $dest &&
-cp mold mold-wrapper.so /mold &&
-chown \$OWNER /mold/mold /mold/mold-wrapper.so /mold/$dest.tar.gz"
+find $dest -print | xargs touch --no-dereference --date=@$timestamp
+find $dest -print | sort | tar -cf - --no-recursion --files-from=- | gzip -9nc > /dist/$dest.tar.gz
+cp mold /dist
+sha256sum /dist/$dest.tar.gz
+"

docs/chart.svg

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stroke-linecap="butt" stroLine truncated

docs/design.md

@@ -1,3 +1,8 @@
+[This document was written in 2020, and the contents are outdated.
+Specifically, we no longer believe that object preloading is a good
+idea. That being said, most of the points in this document still hold
+even today. Therefore, I'll keep this document as-is.]
+
 ## Design and implementation of mold
 
 For the rest of this documentation, I'll explain the design and the

docs/execstack.md

@@ -23,10 +23,10 @@ process.
 
 To prevent this type of attack, the stack area is no longer executable
 since the early 2000s. On Linux, the stack's executable-ness is
-controlled by a bit in an executable, and the loader respect that
+controlled by a bit in an executable, and the loader respects that
 bit. The bit is set by the linker.
 
-GCC had (and still have) a feature that depends on the executable
+GCC had (and still has) a feature that depends on the executable
 stack, so they invented a way to tell the linker to mark the stack
 executable. Specifically, if an object file contains a
 `.note.GNU-stack` section with the `SHF_EXECSTACK` bit, GNU linker
@@ -48,8 +48,8 @@ feature which still depends on the executable stack.
 
 # How to fix it?
 
-If you know what you are doing, pass `-z execstack` to mold. Beaware
+If you know what you are doing, pass `-z execstack` to mold. Beware
 that this will significantly weaken your program's security.
 
 If you don't want to pass `-z execstack`, rewrite your code so that
-your code does not depends on the executable stack.
+your code does not depend on the executable stack.

docs/memory-sanitizer.md

@@ -0,0 +1,179 @@
+# Instrumenting mold with MemorySanitizer
+
+## Introduction
+
+Per <https://github.com/google/sanitizers/wiki/MemorySanitizerLibcxxHowTo>:
+
+> If you want MemorySanitizer to work properly and not produce any false
+> positives, you must ensure that all the code in your program and in
+> libraries it uses is instrumented (i.e. built with `-fsanitize=memory`).
+> In particular, you would need to link against an MSan-instrumented C++
+> standard library. We recommend to use [libc++](https://libcxx.llvm.org/)
+> for that purpose.
+
+## Building instrumented libc++
+
+Build an MSan-instrumented libc++ from source:
+
+```sh
+cd ~
+git clone https://github.com/llvm/llvm-project
+cd llvm-project
+cmake -S ./runtimes -B build-libcxx -G Ninja  \
+    -DCMAKE_BUILD_TYPE=Release                \
+    -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
+    -DCMAKE_C_COMPILER=clang                  \
+    -DCMAKE_CXX_COMPILER=clang++              \
+    -DLLVM_USE_SANITIZER=MemoryWithOrigins
+cmake --build build-libcxx -- cxx cxxabi
+export LIBCXX="$HOME/llvm-project/build-libcxx" # for subsequent build steps
+```
+
+Upon success, `./build-libcxx/{include,lib}` will contain the resulting
+headers and shared libraries.
+
+## Linking mold against instrumented libc++
+
+Use the `MOLD_USE_MSAN` and `MOLD_STDLIB_PREFIX` cmake variables to link
+mold against the instrumented build of libc++:
+
+```sh
+cd ~
+git clone https://github.com/rui314/mold.git
+cd mold
+cmake -B build -G Ninja            \
+    -DCMAKE_BUILD_TYPE=Debug       \
+    -DCMAKE_C_COMPILER=clang       \
+    -DCMAKE_CXX_COMPILER=clang++   \
+    -DMOLD_USE_MSAN=ON             \
+    -DMOLD_STDLIB_PREFIX="$LIBCXX" \
+    -DMOLD_USE_MIMALLOC=OFF        \
+    -DMOLD_USE_SYSTEM_TBB=ON
+cmake --build build
+```
+
+Most of mold's tests (except those for `-flto`) should work at this
+point. Run them like normal:
+
+```sh
+ctest --test-dir build
+```
+
+Any resulting MemorySanitizer errors should be visible in
+`./build/Temporary/Testing/LastTest.log`.
+
+## Building instrumented LTO plugin (experimental)
+
+Exercising `-flto` with MemorySanitizer (and without false positives)
+requires instrumenting the transitive dependencies of `lto-unix.cc`:
+
+- `libiberty.a`
+- `liblto_plugin.so`
+- `LLVMgold.so`
+
+> [!NOTE]
+> This is more involved and time-consuming than building only libc++ from
+> source. The cost-benefit ratio of this additional instrumentation and
+> test coverage may be unfavorable in many cases.
+
+> [!IMPORTANT]
+> The following steps are experimental and unlikely to work exactly as-is
+> under CI runners and individual developer environments. Consider the
+> following a starting point rather than a complete HOWTO.
+
+Build an MSan-instrumented GNU libiberty:
+
+```sh
+cd ~
+git clone [email protected]:gcc-mirror/gcc.git
+cd gcc/libiberty
+export CC=clang
+export CFLAGS="-g -Og -fsanitize=memory -fsanitize-memory-track-origins"
+export LDFLAGS="-fsanitize=memory"
+./configure
+make -j$(nproc)
+unset CC CFLAGS LDFLAGS
+```
+
+Install the resulting `./libiberty.a` into the build toolchain being
+tested with mold. If the system image is ephemeral or disposable (e.g. a
+short-lived VM or container), a quick-and-dirty install could look like:
+
+```sh
+sudo cp /usr/lib/libiberty.a{,.bak}
+sudo cp ./libiberty.a /usr/lib/
+```
+
+Build an MSan-instrumented GCC LTO plugin library:
+
+```sh
+cd ~/gcc/lto-plugin # use already-cloned repo from earlier step
+export CC=clang
+export CFLAGS="-g -Og -fsanitize=memory -fsanitize-memory-track-origins"
+export LDFLAGS="-fsanitize=memory"
+./configure --with-libiberty=/usr/lib
+make -j$(nproc)
+unset CC CFLAGS LDFLAGS
+```
+
+Install the resulting `liblto_plugin.so`. With the same caveats discussed
+above, a simple install into an ephemeral environment could look like:
+
+```sh
+export GCC_VERSION="$(gcc -dumpversion)"
+sudo cp /usr/lib/gcc/x86_64-pc-linux-gnu/$GCC_VERSION/liblto_plugin.so{,.bak}
+sudo cp .libs/liblto_plugin.so /usr/lib/gcc/x86_64-pc-linux-gnu/$GCC_VERSION/
+```
+
+Build an MSan-instrumented LLVM LTO plugin library:
+
+```sh
+cd ~/llvm-project # use already-cloned repo from earlier step
+
+CF="-nostdinc++ -isystem $LIBCXX/include/c++/v1"
+INCDIR="$(find /usr -name plugin-api.h -type f | head -1 | xargs dirname)"
+
+function configure
+{
+    cmake -S ./llvm -B build-plugin -G Ninja   \
+        -DLLVM_ENABLE_PROJECTS=clang           \
+        -DLLVM_TARGETS_TO_BUILD=X86            \
+        -DCMAKE_BUILD_TYPE=Release             \
+        -DCMAKE_C_COMPILER=clang               \
+        -DCMAKE_CXX_COMPILER=clang++           \
+        -DCMAKE_C_FLAGS="$CF"                  \
+        -DCMAKE_CXX_FLAGS="$CF"                \
+        -DCMAKE_EXE_LINKER_FLAGS="$1"          \
+        -DCMAKE_POSITION_INDEPENDENT_CODE=ON   \
+        -DLLVM_BINUTILS_INCDIR="$INCDIR"       \
+        -DLLVM_USE_SANITIZER=MemoryWithOrigins
+}
+
+# workaround for linker issues: configure twice with different LDFLAGS
+configure "-nostdlib++ -L $LIBCXX/lib -Wl,--rpath=$LIBCXX/lib"
+configure "-nostdlib++ -L $LIBCXX/lib -lc++ -Wl,--rpath=$LIBCXX/lib"
+
+cmake --build build-plugin -- LLVMgold.so
+```
+
+Install the resulting `LLVMgold.so`. With the same caveats discussed
+above, a simple install into an ephemeral environment could look like:
+
+```sh
+sudo cp /usr/lib/LLVMgold.so{,.bak}
+sudo cp ./build-plugin/lib/LLVMgold.so /usr/lib/
+```
+
+mold's tests for `-flto` should now (mostly) work, though there do seem
+to be issues around `gcc` inferring `-flto` when not explicitly specified.
+One workaround is to use `clang` as `TEST_CC`:
+
+```sh
+cd ~/mold # use already-cloned and built repo from earlier step
+TEST_CC=clang TEST_CXX=clang++ ctest --test-dir build
+```
+
+## References
+
+- <https://github.com/google/sanitizers/wiki/MemorySanitizerBootstrappingClang>
+- <https://llvm.org/docs/GoldPlugin.html#lto-how-to-build>

docs/mold.md

@@ -0,0 +1,985 @@
+mold(1) -- a modern linker
+==========================
+
+## SYNOPSIS
+
+`mold` [_option_...] _file_...
+
+## DESCRIPTION
+`mold` is a faster drop-in replacement for the default GNU ld(1).
+
+### How to use
+See <https://github.com/rui314/mold#how-to-use>.
+
+### Compatibility
+
+`mold` is designed to be a drop-in replacement for the GNU linkers for
+linking user-land programs. If your user-land program cannot be built due to
+missing command-line options, please file a bug at
+<https://github.com/rui314/mold/issues>.
+
+`mold` supports a very limited set of linker script features, which is just
+sufficient to read `/usr/lib/x86_64-linux-gnu/libc.so` on Linux systems (on
+Linux, that file is contrary to its name not a shared library but an ASCII
+linker script that loads a real `libc.so` file.)
+
+Beyond that, we have no plan to support any additional linker script features.
+The linker script is an ad-hoc, over-designed, complex language which we
+believe needs to be replaced by a simpler mechanism. We have a plan to add a
+replacement for the linker script to `mold` instead.
+
+### Archive symbol resolution
+
+Traditionally, Unix linkers are sensitive to the order in which input files
+appear on the command line. They process input files from the first (leftmost)
+file to the last (rightmost) file one-by-one. While reading input files, they
+maintain sets of defined and undefined symbols. When visiting an archive file
+(`.a` files), they pull out object files to resolve as many undefined symbols
+as possible and move on to the next input file. Object files that weren't
+pulled out will never have a chance for a second look.
+
+Due to this behavior, you usually have to add archive files at the end of a
+command line, so that when a linker reaches archive files, it knows what
+symbols remain as undefined.
+
+If you put archive files at the beginning of a command line, a linker doesn't
+have any undefined symbols, and thus no object files will be pulled out from
+archives. You can change the processing order by using the `--start-group` and
+`--end-group` options, though they make a linker slower.
+
+`mold`, as well as the LLVM lld(1) linker, takes a different approach. They
+remember which symbols can be resolved from archive files instead of
+forgetting them after processing each archive. Therefore, `mold` and lld(1)
+can "go back" in a command line to pull out object files from archives if they
+are needed to resolve remaining undefined symbols. They are not sensitive to
+the input file order.
+
+`--start-group` and `--end-group` are still accepted by `mold` and lld(1)
+for compatibility with traditional linkers, but they are silently ignored.
+
+### Dynamic symbol resolution
+
+Some Unix linker features are difficult to understand without comprehending
+the semantics of dynamic symbol resolution. Therefore, even though it's not
+specific to `mold`, we'll explain it here.
+
+We use "ELF module" or just "module" as a collective term to refer to an
+executable or a shared library file in the ELF format.
+
+An ELF module may have lists of imported symbols and exported symbols, as well
+as a list of shared library names from which imported symbols should be
+imported. The point is that imported symbols are not bound to any specific
+shared library until runtime.
+
+Here is how the Unix dynamic linker resolves dynamic symbols. Upon the start
+of an ELF program, the dynamic linker constructs a list of ELF modules which,
+as a whole, consist of a complete program. The executable file is always at
+the beginning of the list followed by its dependent shared libraries. An
+imported symbol is searched from the beginning of the list to the end. If two
+or more modules define the same symbol, the one that appears first in the list
+takes precedence over the others.
+
+This Unix semantics are contrary to systems such as Windows that have a
+two-level namespace for dynamic symbols. On Windows, for example, dynamic
+symbols are represented as a tuple of (`symbol-name`, `shared-library-name`),
+so that each dynamic symbol is guaranteed to be resolved from some specific
+library.
+
+Typically, an ELF module that exports a symbol also imports the same symbol.
+Such a symbol is usually resolved to itself, but that's not the case if a
+module that appears before it in the symbol search list provides another
+definition of the same symbol.
+
+Let's take `malloc` as an example. Assume that you define your version of
+`malloc` in your main executable file. Then, all `malloc` calls from any
+module are resolved to your function instead of the one in libc, because the
+executable is always at the beginning of the dynamic symbol search list. Note
+that even `malloc` calls within libc are resolved to your definition since
+libc exports and imports `malloc`. Therefore, by defining `malloc` yourself,
+you can overwrite a library function, and the `malloc` in libc becomes dead
+code.
+
+These Unix semantics are tricky and sometimes considered harmful. For example,
+assume that you accidentally define `atoi` as a global function in your
+executable that behaves completely differently from the one in the C standard.
+Then, all `atoi` function calls from any modules (even function calls within
+libc) are redirected to your function instead of the one in libc, which will
+very likely cause a problem. That is a somewhat surprising consequence for an
+accidental name conflict. On the other hand, this semantic is sometimes useful
+because it allows users to override library functions without rebuilding
+modules containing them.
+
+Whether good or bad, you should keep these semantics in mind to understand
+Unix linkers' behaviors.
+
+### Build reproducibility
+
+`mold`'s output is deterministic. That is, if you pass the same object files
+and the same command-line options to the same version of `mold`, it is
+guaranteed that `mold` produces the bit-for-bit identical output. The linker's
+internal randomness, such as the timing of thread scheduling or iteration
+orders of hash tables, doesn't affect the output.
+
+`mold` does not have any host-specific default settings. This is contrary to the
+GNU linkers, for which some configurable values, such as system-dependent
+library search paths, are hard-coded. `mold` depends only on its command-line
+arguments.
+
+## OPTION NOTATIONS
+
+Multi-letter long options may precede either a single dash or double dashes,
+except for those starting with the letter "o". For historical reasons, long
+options beginning with "o" must precede double dashes.
+
+For example, you can spell `--as-needed` as `-as-needed`, but `--omagic` must
+not be spelled as `-omagic`. `-omagic` will be interpreted not as `--omagic`
+but as `-o magic`.
+
+## MOLD-SPECIFIC OPTIONS
+
+* `--chroot`=_dir_:
+  Set _dir_ as the root directory.
+
+* `--color-diagnostics`=[ _auto_ | _always_ | _never_ ]:
+  Show diagnostic messages in color using ANSI escape sequences. `auto` means
+  that `mold` prints out messages in color only if the standard output is
+  connected to a TTY. Default is `auto`.
+
+* `--color-diagnostics`:
+  Synonym for `--color-diagnostics=auto`.
+
+* `--no-color-diagnostics`:
+  Synonym for `--color-diagnostics=never`.
+
+* `--detach`, `--no-detach`:
+  Permit or do not permit mold to create a debug info file in the background.
+
+* `--fork`, `--no-fork`:
+  Spawn a child process and let it do the actual linking. When linking a large
+  program, the OS kernel can take a few hundred milliseconds to terminate a
+  `mold` process. `--fork` hides that latency. By default, it does fork.
+
+  Note that `--fork` also hides the resource usage statistics reported by
+  time(2), since it doesn't call waitpid(2) on the child process. If you
+  need those statistics, pass `--no-fork`.
+
+* `--perf`:
+  Print performance statistics.
+
+* `--print-dependencies`:
+  Print out dependency information for input files.
+
+  Each line of the output for this option shows which file depends on which
+  file to use a specific symbol. This option is useful for debugging why some
+  object file in a static archive got linked or why some shared library is
+  kept in an output file's dependency list even with `--as-needed`.
+
+* `--relocatable-merge-sections`:
+  By default, `mold` doesn't merge input sections by name when merging input
+  object files into a single output object file for `-r`. For example,
+  `.text.foo` and `.text.bar` aren't merged for `-r` even though they are
+  merged into `.text` based on the default section merging rules.
+
+  This option changes the behavior so that `mold` merges input sections by
+  name by the default section merging rules.
+
+* `--repro`:
+  Archive input files, as well as a text file containing command line options,
+  in a tar file so that you can run `mold` with the exact same inputs again.
+  This is useful for reporting a bug with a reproducer. The output filename is
+  `path/to/output.tar`, where `path/to/output` is an output filename specified
+  by `-o`.
+
+* `--reverse-sections`:
+  Reverse the order of input sections before assigning them the offsets in the
+  output file.
+
+  This option is useful for finding bugs that depend on the initialization
+  order of global objects. In C++, constructors of global objects in a single
+  source file are guaranteed to be executed in the source order, but there's
+  no such guarantee across compilation units. Usually, constructors are
+  executed in the order given to the linker, but depending on it is a mistake.
+
+  By reversing the order of input sections using `--reverse-sections`, you can
+  easily test that your program works in the reversed initialization order.
+
+* `--run` _command_ _arg_...:
+  Run _command_ with `mold` as `/usr/bin/ld`. Specifically, `mold` runs a
+  given command with the `LD_PRELOAD` environment set to intercept exec(3)
+  family functions and replaces `argv[0]` with itself if it is `ld`,
+  `ld.gold`, or `ld.lld`.
+
+* `--separate-debug-file`, `--separate-debug-file`=_file_:
+  Bundle debug info sections into a separate file instead of embedding them in
+  an output executable or a shared library. mold creates a debug info file in
+  the background by default, so that you can start running your executable as
+  soon as possible.
+
+  By default, the debug info file is created in the same directory as is the
+  output file, with the `.dbg` file extension. That filename is embedded into
+  the output file so that `gdb` can automatically find the debug info file for
+  the output file. For more info about gdb features related to separate debug
+  files, see
+  <https://sourceware.org/gdb/current/onlinedocs/gdb.html/Separate-Debug-Files.html>.
+
+  mold holds a file lock with flock(2) while creating a debug info file in the
+  background.
+
+  If you don't want to create a debug info file in the background, pass the
+  `--no-detach` option.
+
+* `--shuffle-sections`, `--shuffle-sections`=_number_:
+  Randomize the output by shuffling the order of input sections before
+  assigning them the offsets in the output file. If a _number_ is given, it's
+  used as a seed for the random number generator, so that the linker produces
+  the same output for the same seed. If no seed is given, a random number is
+  used as a seed.
+
+  This option is useful for benchmarking. Modern CPUs are sensitive to a
+  program's memory layout. A seemingly benign change in program layout, such
+  as a small size increase of a function in the middle of a program, can
+  affect the program's performance. Therefore, even if you write new code and
+  get a good benchmark result, it is hard to say whether the new code improves
+  the program's performance; it is possible that the new memory layout happens
+  to perform better.
+
+  By running a benchmark multiple times with randomized memory layouts using
+  `--shuffle-sections`, you can isolate your program's real performance number
+  from the randomness caused by memory layout changes.
+
+* `--spare-program-headers`=_number_:
+  Append the given number of `PT_NULL` entries to the end of the program
+  header, so that post-link processing tools can easily add new segments by
+  overwriting the null entries.
+
+  Note that ELF requires all `PT_LOAD` segments to be sorted by `p_vaddr`.
+  Therefore, if you add a new LOAD segment, you may need to sort the entire
+  program header.
+
+* `--stats`:
+  Print input statistics.
+
+* `--thread-count`=_count_:
+  Use _count_ number of threads.
+
+* `--threads`, `--no-threads`:
+  Use multiple threads. By default, `mold` uses as many threads as the number of
+  cores or 32, whichever is smaller. The reason it is capped at 32 is because
+  `mold` doesn't scale well beyond that point. To use only one thread, pass
+  `--no-threads` or `--thread-count=1`.
+
+* `--quick-exit`, `--no-quick-exit`:
+  Use or do not use `quick_exit` to exit.
+
+* `--zero-to-bss`:
+  Convert all-zero data sections into BSS.
+
+  When this option is enabled, `mold` scans input data sections that are not
+  of type `SHT_NOBITS` and checks whether their contents consist solely of
+  zero bytes. Such sections are then converted into BSS (`SHT_NOBITS`)
+  sections. This reduces the size of the output file, since BSS sections
+  occupy no space in the file image.
+
+  This behavior is especially useful for user-defined sections created with
+  `__attribute__((section(".sectname")))` that contain uninitialized global
+  variables. GCC and Clang do not automatically mark such sections as BSS
+  even if their contents are entirely zero, and instead emit them as regular
+  data sections.
+
+  For example, consider `__attribute__((section(".sectname"))) int vec[256];`.
+
+  By default, this results in a `.sectname` section of type `SHT_PROGBITS`
+  filled with zeros. With `--zero-to-bss`, the linker will recognize it as
+  empty data and convert it to a `SHT_NOBITS` section, reducing the output
+  file size without changing runtime semantics.
+
+* `-z rewrite-endbr`, `-z norewrite-endbr`:
+  As a security measure, some CPU instruction sets have recently gained a
+  feature to protect control flow integrity by disallowing indirect branches
+  by default. If the feature is enabled, the instruction that is executed
+  immediately after an indirect branch must be an branch target marker
+  instruction, or a CPU-level fault will raise. The marker instruction is also
+  known as "landing pad" instruction, to which indirect branches can land.
+  This feature makes ROP attacks harder to conduct.
+
+  To use the feature, a function whose pointer is taken needs to begin with a
+  landing pad because a function call via a function pointer is compiled to an
+  indirect branch. On the other hand, if a function is called only directly
+  (i.e. referred to only by _direct_ branch instructions), it doesn't have to
+  begin with it.
+
+  By default, the compiler always emits a landing pad at the beginning of each
+  global function because it doesn't know whether or not the function's
+  pointer is taken in another translation unit. As a result, the resulting
+  binary has more attack surface than necessary.
+
+  If `--rewrite-endbr` is given, mold conducts a whole program analysis
+  to identify functions whose addresses are actually taken and rewrites
+  landing pads with no-ops for non-address-taken functions, reducing the
+  attack surface.
+
+  This feature is currently available only on x86-64.
+
+## GNU-COMPATIBLE OPTIONS
+
+* `--help`:
+  Report usage information to stdout and exit.
+
+* `-v`, `--version`:
+  Report version information to stdout.
+
+* `-V`:
+  Report version and target information to stdout.
+
+* `-E`, `--export-dynamic`, `--no-export-dynamic`:
+  When creating an executable, using the `-E` option causes all global symbols
+  to be put into the dynamic symbol table, so that the symbols are visible
+  from other ELF modules at runtime.
+
+  By default, or if `--no-export-dynamic` is given, only symbols that are
+  referenced by DSOs at link-time are exported from an executable.
+
+* `-F` _libname_, `--filter`=_libname_:
+  Set the `DT_FILTER` dynamic section field to _libname_.
+
+* `-I` _file_, `--dynamic-linker`=_file_, `--no-dynamic-linker`:
+  Set the dynamic linker path to _file_. If no `-I` option is given, or if
+  `--no-dynamic-linker` is given, no dynamic linker path is set to an output
+  file. This is contrary to the GNU linkers which set a default dynamic linker
+  path in that case. This difference doesn't usually make any difference
+  because the compiler driver always passes `-I` to the linker.
+
+* `-L` _dir_, `--library-path`=_dir_:
+  Add _dir_ to the list of library search paths from which `mold` searches
+  libraries for the `-l` option.
+
+  Unlike the GNU linkers, `mold` does not have default search paths. This
+  difference doesn't usually make any difference because the compiler driver
+  always passes all necessary search paths to the linker.
+
+* `-M`, `--print-map`:
+  Write a map file to stdout.
+
+* `-N`, `--omagic`, `--no-omagic`:
+  Force `mold` to emit an output file with an old-fashioned memory layout.
+  First, it makes the first data segment not aligned to a page boundary.
+  Second, text segments are marked as writable if the option is given.
+
+* `-S`, `--strip-debug`:
+  Omit `.debug_*` sections from the output file.
+
+* `-T` _file_, `--script`=_file_:
+  Read linker script from _file_.
+
+* `-X`, `--discard-locals`:
+  Discard temporary local symbols to reduce the sizes of the symbol table and
+  the string table. Temporary local symbols are local symbols starting with
+  `.L`. Compilers usually generate such symbols for unnamed program elements
+  such as string literals or floating-point literals.
+
+* `-e` _symbol_, `--entry`=_symbol_:
+
+  Use _symbol_ as the entry point symbol instead of the default entry
+  point symbol _start.
+
+* `-f` _shlib_, `--auxiliary`=_shlib_:
+  Set the `DT_AUXILIARY` dynamic section field to _shlib_.
+
+* `-h` _libname_, `--soname`=_libname_:
+  Set the `DT_SONAME` dynamic section field to _libname_. This option is used
+  when creating a shared object file. Typically, when you create `libfoo.so`,
+  you want to pass `--soname=foo` to a linker.
+
+* `-l` _libname_:
+  Search for `lib`_libname_`.so` or `lib`_libname_`.a` from library search
+  paths.
+
+* `-m` _target_:
+  Choose a _target_.
+
+* `-o` _file_, `--output`=_file_:
+  Use _file_ as the output file name instead of the default name `a.out`.
+
+* `-r`, `--relocatable`:
+  Instead of generating an executable or a shared object file, combine input
+  object files to generate another object file that can be used as an input to
+  a linker.
+
+* `-s`, `--strip-all`:
+  Omit `.symtab` section from the output file.
+
+* `-u` _symbol_, `--undefined`=_symbol_:
+  If _symbol_ remains as an undefined symbol after reading all object files,
+  and if there is a static archive that contains an object file defining
+  _symbol_, pull out the object file and link it so that the output file
+  contains a definition of _symbol_.
+
+* `-y` _symbol_, `--trace-symbol`=_symbol_:
+  Trace references to _symbol_.
+
+* `--Bdynamic`:
+  Link against shared libraries.
+
+* `--Bstatic`:
+  Do not link against shared libraries.
+
+* `--Bsymbolic`:
+  When creating a shared library, make global symbols export-only (i.e. do not
+  import the same symbol). As a result, references within a shared library are
+  always resolved locally, negating symbol override at runtime. See "Dynamic
+  symbol resolution" for more information about symbol imports and exports.
+
+* `--Bsymbolic-functions`:
+  This option has the same effect as `--Bsymbolic` but works only for function
+  symbols. Data symbols remain being both imported and exported.
+
+* `--Bsymbolic-non-weak`:
+  This option has the same effect as `--Bsymbolic` but works only for non-weak
+  symbols. Weak symbols remain being both imported and exported.
+
+* `--Bsymbolic-non-weak-functions`:
+  This option has the same effect as `--Bsymbolic` but works only for non-weak
+  function symbols. Data symbols and weak function symbols remain being both
+  imported and exported.
+
+* `--Bno-symbolic`:
+  Cancel `--Bsymbolic`, `--Bsymbolic-functions`, `--Bsymbolic-non-weak` and
+  `--Bsymbolic-non-weak-functions`.
+
+* `--Map`=_file_:
+  Write map file to _file_.
+
+* `--Tbss`=_address_:
+  Alias for `--section-start=.bss=`_address_.
+
+* `--Tdata`=_address_:
+  Alias for `--section-start=.data=`_address_.
+
+* `--Ttext`=_address_:
+  Alias for `--section-start=.text=`_address_.
+
+* `--allow-multiple-definition`:
+  Normally, the linker reports an error if there are more than one definition
+  of a symbol. This option changes the default behavior so that it doesn't
+  report an error for duplicate definitions and instead use the first
+  definition.
+
+* `--allow-shlib-undefined`, `--no-allow-shlib-undefined`:
+  Even if mold succeeds in linking a main executable without undefined symbol
+  errors, you may still encounter symbol lookup errors at runtime because the
+  dynamic linker cannot find some symbols in shared libraries in any ELF
+  module. This occurs because mold ignores undefined symbols in shared
+  libraries by default.
+
+  If you pass `--no-allow-shlib-undefined`, mold verifies that undefined
+  symbols in shared libraries given to the linker can be resolved at
+  link-time. In other words, this converts the runtime error to a link-time
+  error.
+
+  Note that you need to pass all shared libraries, including indirectly
+  dependent ones, to the linker as arguments for `-l`. If a shared library
+  depends on a library that's not passed to the linker, the verification will
+  be skipped for that file.
+
+* `--as-needed`, `--no-as-needed`:
+  By default, shared libraries given to the linker are unconditionally added
+  to the list of required libraries in an output file. However, shared
+  libraries after `--as-needed` are added to the list only when at least one
+  symbol is actually used by the output file. In other words, shared libraries
+  after `--as-needed` are not added to the list of needed libraries if they
+  are not needed by a program.
+
+  The `--no-as-needed` option restores the default behavior for subsequent
+  files.
+
+* `--build-id`=[ `md5` | `sha1` | `sha256` | `fast` | `uuid` | `0x`_hexstring_ | `none` ]:
+  Create a `.note.gnu.build-id` section containing a byte string to uniquely
+  identify an output file. `sha256` compute a 256-bit cryptographic hash of an
+  output file and set it to build-id. `md5` and `sha1` compute the same hash
+  but truncate it to 128 and 160 bits, respectively, before setting it to
+  build-id. `uuid` sets a random 128-bit UUID. `0x`_hexstring_ sets
+  _hexstring_. `fast` is a synonym for `sha256`.
+
+* `--build-id`:
+  Synonym for `--build-id=sha256`.
+
+* `--no-build-id`:
+  Synonym for `--build-id=none`.
+
+* `--compress-debug-sections`=[ `zlib` | `zlib-gabi` | `zlib:`_N_ | `zstd` | `zstd:`_N_ | `none` ]:
+  Compress DWARF debug info (`.debug_*` sections) using the zlib or zstd
+  compression algorithm. `zlib-gabi` is an alias for `zlib`. `zlib:`_N_
+  selects the zlib compression level, where _N_ is between 0 and 9 (0
+  means no compression), and `zstd:`_N_ selects the zstd compression
+  level, where _N_ is between 1 and 22. Higher levels achieve better
+  compression ratios but are slower. `zlib` is equivalent to `zlib:1`
+  and `zstd` is equivalent to `zstd:3`.
+
+* `--defsym`=_symbol_=_value_:
+  Define _symbol_ as an alias for _value_.
+
+  _value_ is either an integer (in decimal or hexadecimal with `0x` prefix) or
+  a symbol name. If an integer is given as a value, _symbol_ is defined as an
+  absolute symbol with the given value.
+
+* `--default-symver`:
+  Use soname as a symbol version and append that version to all symbols.
+
+* `--demangle`, `--no-demangle`:
+  Demangle C++ and Rust symbols in log messages.
+
+* `--dependency-file`=_file_:
+  Write a dependency file to _file_. The contents of the written file is
+  readable by make(1), which defines only one rule with the linker's output
+  file as a target and all input files as its prerequisites. Users are
+  expected to include the generated dependency file into a Makefile to
+  automate the dependency management. This option is analogous to the
+  compiler's `-MM -MF` options.
+
+* `--dynamic-list`=_file_:
+  Read a list of dynamic symbols from _file_. Same as
+  `--export-dynamic-symbol-list`, except that it implies `--Bsymbolic`. If
+  _file_ does not exist in the current directory, it is searched from library
+  search paths for the sake of compatibility with GNU ld.
+
+* `--eh-frame-hdr`, `--no-eh-frame-hdr`:
+  Create `.eh_frame_hdr` section.
+
+* `--emit-relocs`:
+  The linker usually "consumes" relocation sections. That is, the linker
+  applies relocations to other sections, and relocation sections themselves
+  are discarded.
+
+  The `--emit-relocs` instructs the linker to leave relocation sections in the
+  output file. Some post-link binary analysis or optimization tools such as
+  LLVM Bolt need them.
+
+* `--enable-new-dtags`, `--disable-new-dtags`:
+  By default, `mold` emits `DT_RUNPATH` for `--rpath`. If you pass
+  `--disable-new-dtags`, `mold` emits `DT_RPATH` for `--rpath` instead.
+
+* `--execute-only`:
+
+  Traditionally, setting the executable bit to 1 for a memory page implies
+  that the page also become readable, which allows machine code to be read
+  as data at runtime. That is actually what an attacker often does after
+  gaining a limited control of a process to find pieces of machine code
+  they can use to gain the full control of the process. As a mitigation,
+  recent processors including some ARM64 ones allows "execute-only" pages.
+  If a page is execute-only, you can call a function there as long as you
+  know its address but can't read it as data.
+
+  This option marks text segments as execute-only by setting just the "X"
+  bit instead of "RX". Note that on most systems, the absence of the "R"
+  bit in the text segment serves just as a hint. If you run a program
+  linked with `--execute-only` on a processor that doesn't support
+  execute-only pages, your executable will likely still function normally,
+  but the text segment will remain readable.
+
+* `--exclude-libs`=_libraries_ ...:
+  Mark all symbols in the given _libraries_ hidden.
+
+* `--export-dynamic-symbol`=_symbol_:
+  Put symbols matching _symbol_ in the dynamic symbol table. _symbol_ may be a
+  glob pattern in the same syntax as for the `--export-dynamic-symbol-list` or
+  `--version-script` options.
+
+* `--export-dynamic-symbol-list`=_file_:
+  Read a list of dynamic symbols from _file_.
+
+* `--fatal-warnings`, `--no-fatal-warnings`:
+  Treat warnings as errors.
+
+* `--fini`=_symbol_:
+  Call _symbol_ at unload-time.
+
+* `--gc-sections`, `--no-gc-sections`:
+  Remove unreferenced sections.
+
+* `--gdb-index`:
+  Create a `.gdb_index` section to speed up GNU debugger. To use this, you
+  need to compile source files with the `-ggnu-pubnames` compiler flag.
+
+* `--hash-style`=[ `sysv` | `gnu` | `both` | `none` ]:
+  Set hash style.
+
+* `--icf`=[ `safe` | `all` | `none` ], `--no-icf`:
+  It is not uncommon for a program to contain many identical functions that
+  differ only in name. For example, a C++ template `std::vector` is very
+  likely to be instantiated to the identical code for `std::vector<int>` and
+  `std::vector<unsigned>` because the container cares only about the size of
+  the parameter type. Identical Code Folding (ICF) is a size optimization to
+  identify and merge such identical functions.
+
+  If `--icf=all` is given, `mold` tries to merge all identical functions. This
+  reduces the size of the output most, but it is not a "safe" optimization. It
+  is guaranteed in C and C++ that two pointers pointing two different
+  functions will never be equal, but `--icf=all` breaks that assumption as two
+  identical functions have the same address after merging. So a care must be
+  taken when you use this flag that your program does not depend on the
+  function pointer uniqueness.
+
+  `--icf=safe` is a flag to merge functions only when it is safe to do so.
+  That is, if a program does not take an address of a function, it is safe to
+  merge that function with other function, as you cannot compare a function
+  pointer with something else without taking an address of a function.
+
+  `--icf=safe` needs to be used with a compiler that supports `.llvm_addrsig`
+  section which contains the information as to what symbols are address-taken.
+  LLVM/Clang supports that section by default. Since GCC does not support it
+  yet, you cannot use `--icf=safe` with GCC (it doesn't do any harm but can't
+  optimize at all.)
+
+  `--icf=none` and `--no-icf` disables ICF.
+
+* `--ignore-data-address-equality`:
+  Make ICF to merge not only functions but also data. This option should be
+  used in combination with `--icf=all`.
+
+* `--image-base`=_addr_:
+  Set the base address to _addr_.
+
+* `--init`=_symbol_:
+  Call _symbol_ at load-time.
+
+* `--no-undefined`:
+  Report undefined symbols (even with `--shared`).
+
+* `--noinhibit-exec`:
+  Create an output file even if errors occur.
+
+* `--package-metadata`=_percent-encoded-string_:
+  Embed a specified string into the `.note.package` section. This option
+  is designed for build scripts that generate binary packages, such as
+  `.rpm` or `.deb`, to include package metadata in each executable. It
+  simplifies the process of identifying the corresponding package for a
+  given executable or core file.
+
+  An argument to this option is treated as percent-encoded and decoded
+  before being inserted into the section, allowing you to avoid the use of
+  the comma (`,`) character in the argument. This is useful because the
+  compiler replaces all occurrences of commas in `-Wl,` with spaces before
+  forwarding them to the linker. Note that `mold` always interprets the
+  argument as percent-encoded, so you also need to escape all occurrences
+  of `%` as `%25`.
+
+* `--pack-dyn-relocs`=[ `relr` | `android` | `android+relr` | `none` ]:
+  Compress dynamic relocations in the output file.
+
+  If `relr` is specified, all `R_*_RELATIVE` relocations are put into
+  `.relr.dyn` section instead of `.rel.dyn` or `.rela.dyn` section. Since
+  `.relr.dyn` section uses a space-efficient encoding scheme, specifying this
+  flag can reduce the size of the output. This is typically most effective for
+  position-independent executable.
+
+  If `android` is specified, all dynamic relocations are encoded in Android's
+  packed relocation format (APS2) and stored in the `.rel.dyn` or `.rela.dyn`
+  section, whose section type is changed to `SHT_ANDROID_REL` or
+  `SHT_ANDROID_RELA`. The dynamic table is updated to use `DT_ANDROID_REL`
+  / `DT_ANDROID_RELA` and their `SZ` variants in place of the standard tags.
+
+  `android+relr` combines both: `R_*_RELATIVE` relocations go to `.relr.dyn`
+  and the rest are APS2-encoded. This is the configuration used by most
+  Android system binaries.
+
+  Note that a runtime loader has to support `.relr.dyn` to run executables or
+  shared libraries linked with `--pack-dyn-relocs=relr`. As of 2026, glibc
+  (since 2.36), musl (since 1.2.4), Android, ChromeOS, and Fuchsia all
+  support it. The APS2 format, on the other hand, is only handled by
+  Android's bionic loader; the encoder itself is target-agnostic, but the
+  produced binary can only be loaded on platforms where bionic (or a
+  compatible loader) handles `DT_ANDROID_REL(A)`.
+
+* `--pie`, `--pic-executable`, `--no-pie`, `--no-pic-executable`:
+  Create a position-independent executable.
+
+* `--print-gc-sections`, `--no-print-gc-sections`:
+  Print removed unreferenced sections.
+
+* `--print-icf-sections`, `--no-print-icf-sections`:
+  Print folded identical sections.
+
+* `--push-state`, `--pop-state`:
+  `--push-state` saves the current values of `--as-needed`, `--whole-archive`,
+  `--static`, and `--start-lib`. The saved values can be restored by
+  pop-state.
+
+  `--push-state` and `--pop-state` pairs can nest.
+
+  These options are useful when you want to construct linker command line
+  options programmatically. For example, if you want to link `libfoo.so` by
+  as-needed basis but don't want to change the global state of `--as-needed`,
+  you can append `--push-state --as-needed -lfoo --pop-state` to the linker
+  command line options.
+
+* `--relax, --no-relax`:
+  Rewrite machine instructions with more efficient ones for some relocations.
+  The feature is enabled by default.
+
+* `--require-defined`=_symbol_:
+  Like `--undefined`, except the new symbol must be defined by the end of the
+  link.
+
+* `--retain-symbols-file`=_file_:
+  Keep only symbols listed in _file_. _file_ is a text file containing a
+  symbol name on each line. `mold` discards all local symbols as well as
+  global symbol that are not in _file_. Note that this option removes symbols
+  only from `.symtab` section and does not affect `.dynsym` section, which is
+  used for dynamic linking.
+
+* `--rpath`=_dir_:
+  Add _dir_ to runtime search paths.
+
+* `--section-start`=_section_=_address_:
+  Set _address_ to section. _address_ is a hexadecimal number that may start
+  with an optional `0x`.
+
+* `--shared`, `--Bshareable`:
+  Create a share library.
+
+* `--spare-dynamic-tags`=_number_:
+  Append the given number of `DT_NULL` entries to the end of the `.dynamic`
+  section, so that post-link processing tools can easily add new dynamic tags
+  by overwriting the null entries.
+
+* `--start-lib`, `--end-lib`:
+  Handle object files between `--start-lib` and `--end-lib` as if they were in
+  an archive file. That means object files between them are linked only when
+  they are needed to resolve undefined symbols. The options are useful if you
+  want to link object files only when they are needed but want to avoid the
+  overhead of running ar(3).
+
+* `--static`:
+  Do not link against shared libraries.
+
+* `--sysroot`=_dir_:
+  Set target system root directory to _dir_.
+
+* `--trace`:
+  Print name of each input file.
+
+* `--undefined-glob`=_pattern_:
+  Synonym for `--undefined`, except that `--undefined-glob` takes a glob
+  pattern instead of just a single symbol name.
+
+* `--undefined-version`, `--no-undefined-version`:
+  By default, `mold` warns on a symbol specified by a version script or by
+  `--export-dynamic-symbol` if it is not defined. You can silence the warning
+  by `--undefined-version`.
+
+* `--unique`=_pattern_:
+  Don't merge input sections that match the given glob pattern _pattern_.
+
+* `--unresolved-symbols`=[ `report-all` | `ignore-all` | `ignore-in-object-files` | `ignore-in-shared-libs` ]:
+  How to handle undefined symbols.
+
+* `--version-script`=_file_:
+  Read version script from _file_. If _file_ does not exist in the current
+  directory, it is searched from library search paths for the sake of
+  compatibility with GNU ld.
+
+* `-w`, `--no-warnings`:
+  Suppress warnings and cancel `--fatal-warnings`.
+
+* `--warn-common`, `--no-warn-common`:
+  Warn about common symbols.
+
+* `--warn-once`:
+  Only warn once for each undefined symbol instead of warn for each relocation
+  referring an undefined symbol.
+
+* `--warn-unresolved-symbols`, `--error-unresolved-symbols`:
+  Normally, the linker reports an error for unresolved symbols.
+  `--warn-unresolved-symbols` option turns it into a warning.
+  `--error-unresolved-symbols` option restores the default behavior.
+
+* `--whole-archive`, `--no-whole-archive`:
+  When archive files (`.a` files) are given to the linker, only object files
+  that are needed to resolve undefined symbols are extracted from them and
+  linked to an output file. `--whole-archive` changes that behavior for
+  subsequent archives so that the linker extracts all object files and links
+  them to an output. For example, if you are creating a shared object file and
+  you want to include all archive members to the output, you should pass
+  `--whole-archive`. `--no-whole-archive` restores the default behavior for
+  subsequent archives.
+
+* `--wrap`=_symbol_:
+  Make _symbol_ be resolved to `__wrap_`_symbol_. The original symbol can be
+  resolved as `__real_`_symbol_. This option is typically used for wrapping an
+  existing function.
+
+* `-z cet-report`=[ `warning` | `error` | `none` ]:
+  Intel Control-flow Enforcement Technology (CET) is a new x86 feature
+  available since Tiger Lake which is released in 2020. It defines new
+  instructions to harden security to protect programs from control hijacking
+  attacks. You can tell the compiler to use the feature by specifying the
+  `-fcf-protection` flag.
+
+  `-z cet-report` flag is used to make sure that all object files were
+  compiled with a correct `-fcf-protection` flag. If `warning` or `error` are
+  given, `mold` prints out a warning or an error message if an object file was
+  not compiled with the compiler flag.
+
+  `mold` looks for `GNU_PROPERTY_X86_FEATURE_1_IBT` bit and
+  `GNU_PROPERTY_X86_FEATURE_1_SHSTK` bit in `.note.gnu.property` section to
+  determine whether or not an object file was compiled with `-fcf-protection`.
+
+* `-z now`, `-z lazy`:
+  By default, functions referring to other ELF modules are resolved by the
+  dynamic linker when they are called for the first time. `-z now` marks an
+  executable or a shared library file so that all dynamic symbols are resolved
+  when a file is loaded to memory. `-z lazy` restores the default behavior.
+
+* `-z origin`:
+  Mark object requiring immediate `$ORIGIN` processing at runtime.
+
+* `-z ibt`:
+  Turn on `GNU_PROPERTY_X86_FEATURE_1_IBT` bit in `.note.gnu.property` section
+  to indicate that the output uses IBT-enabled PLT. This option implies `-z
+  ibtplt`.
+
+* `-z ibtplt`:
+  Generate Intel Branch Tracking (IBT)-enabled PLT which is the default on
+  x86-64. This is the default.
+
+* `-z execstack`, `-z noexecstack`:
+  By default, the pages for the stack area (i.e. the pages where local
+  variables reside) are not executable for security reasons. `-z execstack`
+  makes it executable. `-z noexecstack` restores the default behavior.
+
+* `-z keep-text-section-prefix`, `-z nokeep-text-section-prefix`:
+  Keep `.text.hot`, `.text.unknown`, `.text.unlikely`, `.text.startup`, and
+  `.text.exit` as separate sections in the final binary instead of merging
+  them as `.text`.
+
+* `-z rodynamic`:
+  Make the `.dynamic` section read-only.
+
+* `-z relro`, `-z norelro`:
+  Some sections such as `.dynamic` have to be writable only during a module is
+  being loaded to memory. Once the dynamic linker finishes its job, such
+  sections won't be mutated by anyone. As a security mitigation, it is
+  preferred to make such segments read-only during program execution.
+
+  `-z relro` puts such sections into a special segment called `relro`. The
+  dynamic linker makes a relro segment read-only after it finishes its job.
+
+  By default, `mold` generates a relro segment. `-z norelro` disables the
+  feature.
+
+* `-z sectionheader`, `-z nosectionheader`:
+  `-z nosectionheader` tell the linker to omit the section header.
+  By default, the linker does not omit the section header.
+
+* `-z separate-loadable-segments`, `-z separate-code`, `-z noseparate-code`:
+  If one memory page contains multiple segments, the page protection bits are
+  set in such a way that the needed attributes (writable or executable) are
+  satisfied for all segments. This usually happens at a boundary of two
+  segments with two different attributes.
+
+  `separate-loadable-segments` adds paddings between segments with different
+  attributes so that they do not share the same page.
+
+  `separate-code` adds paddings only between executable and non-executable
+  segments. This is the default.
+
+  `noseparate-code` does not add any paddings between segments.
+
+* `-z defs`, `-z nodefs`:
+  Report undefined symbols (even with `--shared`).
+
+* `-z shstk`:
+  Enforce shadow stack by turning `GNU_PROPERTY_X86_FEATURE_1_SHSTK` bit in
+  `.note.gnu.property` output section. Shadow stack is part of Intel
+  Control-flow Enforcement Technology (CET), which is available since Tiger
+  Lake (2020).
+
+* `-z start_stop_visibility`=[ `hidden` | `protected` ]:
+  If a section name is valid as a C identifier (i.e., it matches
+  `/^[_a-zA-Z][_a-zA-Z0-9]*$/`), mold creates `__start_SECNAME` and
+  `__stop_SECNAME` symbols to mark the beginning and end of the section,
+  where `SECNAME` is the section name.
+
+  You can make these marker symbols visible from other ELF modules by passing
+  `-z start_stop_visibility=protected`. Default is `hidden`.
+
+* `-z text`, `-z notext`, `-z textoff`:
+  `mold` by default reports an error if dynamic relocations are created in
+  read-only sections. If `-z notext` or `-z textoff` are given, `mold` creates
+  such dynamic relocations without reporting an error. `-z text` restores the
+  default behavior.
+
+* `-z max-page-size`=_number_:
+  Some CPU ISAs support multiple memory page sizes. This option specifies the
+  maximum page size that an output binary can run on. In general, binaries
+  built for a larger page size can run on a system with a smaller page size,
+  but not vice versa. The default value is 4 KiB for i386, x86-64, and RISC-V,
+  and 64 KiB for ARM64.
+
+* `-z nodefaultlib`:
+  Make the dynamic loader ignore default search paths.
+
+* `-z nodelete`:
+  Mark DSO non-deletable at runtime.
+
+* `-z nodlopen`:
+  Mark DSO not available to dlopen(3). This option makes it possible for the
+  linker to optimize thread-local variable accesses by rewriting instructions
+  for some targets.
+
+* `-z nodump`:
+  Mark DSO not available to dldump(3).
+
+* `-z nocopyreloc`:
+  Do not create copy relocations.
+
+* `-z initfirst`:
+  Mark DSO to be initialized first at runtime.
+
+* `-z interpose`:
+  Mark object to interpose all DSOs but executable.
+
+* `-(`, `-)`, `-EL`, `-O`_number_, `--dc`, `--dp`, `--end-group`, `--no-add-needed`, `--no-copy-dt-needed-entries`, `--nostdlib`, `--rpath-link=Ar dir`, `--sort-common`, `--sort-section`, `--start-group`, `--warn-constructors`, `--warn-once`, `--fix-cortex-a53-835769`, `--fix-cortex-a53-843419`, `-z combreloc`, `-z common-page-size`, `-z nocombreloc`:
+  Ignored
+
+## ENVIRONMENT VARIABLES
+
+* `MOLD_JOBS`:
+  If this variable is set to `1`, only one `mold` process will run at a time.
+  If a new mold process is initiated while another is already active, the new
+  process will wait until the active one completes before starting.
+
+  The primary reason for this environment variable is to minimize peak memory
+  usage. Since mold is designed to operate with high parallelism, running
+  multiple mold instances simultaneously may not be beneficial. If you execute
+  N instances of mold concurrently, it could require N times the time and N
+  times the memory. On the other hand, running them one after the other might
+  still take N times longer, but the peak memory usage would be the same as
+  running just a single instance.
+
+  If your build system invokes multiple linker processes simultaneously and
+  some of them often get killed due to out-of-memory errors, you might
+  consider setting this environment variable to `1` to see if it addresses the
+  OOM issue.
+
+  Currently, any value other than `1` is silently ignored.
+
+* `MOLD_DEBUG`:
+  If this variable is set to a non-empty string, `mold` embeds its
+  command-line options in the output file's `.comment` section.
+
+* `MOLD_REPRO`:
+  Setting this variable to a non-empty string has the same effect as passing
+  the `--repro` option.
+
+## SEE ALSO
+
+gold(1), ld(1), elf(5), ld.so(8)
+
+## AUTHOR
+
+Rui Ueyama <ruiu@cs.stanford.edu>
+
+## BUGS
+
+Report bugs to <https://github.com/rui314/mold/issues>.

elf/arch-arm32.cc

@@ -1,604 +0,0 @@
-// ARM32 is a bit special from the linker's viewpoint because ARM
-// processors support two different instruction encodings: Thumb and
-// ARM (in a narrower sense). Thumb instructions are either 16 bits or
-// 32 bits, while ARM instructions are all 32 bits. Feature-wise,
-// thumb is a subset of ARM, so not all ARM instructions are
-// representable in Thumb.
-//
-// ARM processors originally supported only ARM instructions. Thumb
-// instructions were later added to increase code density.
-//
-// ARM processors runs in either ARM mode or Thumb mode. The mode can
-// be switched using BX (branch and mode exchange)-family instructions.
-// We need to use such instructions to, for example, call a function
-// encoded in Thumb from a function encoded in ARM. Sometimes, the
-// linker even has to emit an interworking thunk code to switch from
-// Thumb to ARM.
-//
-// ARM instructions are aligned to 4 byte boundaries. Thumb are to 2
-// byte boundaries.
-//
-// You can distinguish Thumb functions from ARM functions by looking
-// at the least significant bit (LSB) of its "address". If LSB is 0,
-// it's ARM; otherwise, Thumb. LSB is not a part of its real address.
-// For example, if a symbol `foo` is of type STT_FUNC and has value
-// 0x2001, then `foo` is a function using Thumb instructions whose
-// address is 0x2000 (not 0x2001).
-
-#include "mold.h"
-
-#include <tbb/parallel_for.h>
-#include <tbb/parallel_for_each.h>
-#include <tbb/parallel_sort.h>
-
-namespace mold::elf {
-
-using E = ARM32;
-
-static void write_mov_imm(u8 *loc, u32 val) {
-  u32 imm12 = bits(val, 11, 0);
-  u32 imm4 = bits(val, 15, 12);
-  *(ul32 *)loc = (*(ul32 *)loc & 0xfff0f000) | (imm4 << 16) | imm12;
-}
-
-static void write_thm_b_imm(u8 *loc, u32 val) {
-  // https://developer.arm.com/documentation/ddi0406/cb/Application-Level-Architecture/Instruction-Details/Alphabetical-list-of-instructions/BL--BLX--immediate-
-  u32 sign = bit(val, 24);
-  u32 I1 = bit(val, 23);
-  u32 I2 = bit(val, 22);
-  u32 J1 = !I1 ^ sign;
-  u32 J2 = !I2 ^ sign;
-  u32 imm10 = bits(val, 21, 12);
-  u32 imm11 = bits(val, 11, 1);
-
-  *(ul16 *)loc = (*(ul16 *)loc & 0xf800) | (sign << 10) | imm10;
-  *(ul16 *)(loc + 2) =
-    (*(ul16 *)(loc + 2) & 0xd000) | (J1 << 13) | (J2 << 11) | imm11;
-}
-
-static void write_thm_mov_imm(u8 *loc, u32 val) {
-  // https://developer.arm.com/documentation/ddi0406/cb/Application-Level-Architecture/Instruction-Details/Alphabetical-list-of-instructions/MOVT
-  u32 imm4 = bits(val, 15, 12);
-  u32 i = bit(val, 11);
-  u32 imm3 = bits(val, 10, 8);
-  u32 imm8 = bits(val, 7, 0);
-  *(ul16 *)loc = (*(ul16 *)loc & 0b1111'1011'1111'0000) | (i << 10) | imm4;
-  *(ul16 *)(loc + 2) =
-    ((*(ul16 *)(loc + 2)) & 0b1000'1111'0000'0000) | (imm3 << 12) | imm8;
-}
-
-template <>
-void PltSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-
-  static const u32 plt0[] = {
-    0xe52de004, // push {lr}
-    0xe59fe004, // ldr lr, 2f
-    0xe08fe00e, // 1: add lr, pc, lr
-    0xe5bef008, // ldr pc, [lr, #8]!
-    0x00000000, // 2: .word .got.plt - 1b - 8
-    0xe320f000, // nop
-    0xe320f000, // nop
-    0xe320f000, // nop
-  };
-
-  memcpy(buf, plt0, sizeof(plt0));
-  *(ul32 *)(buf + 16) = ctx.gotplt->shdr.sh_addr - this->shdr.sh_addr - 16;
-
-  for (Symbol<E> *sym : symbols) {
-    static const u32 plt[] = {
-      0xe59fc004, // 1: ldr ip, 2f
-      0xe08cc00f, // add ip, ip, pc
-      0xe59cf000, // ldr pc, [ip]
-      0x00000000, // 2: .word sym@PLTGOT - 1b
-    };
-
-    u8 *ent = buf + sizeof(plt0) + sym->get_plt_idx(ctx) * sizeof(plt);
-    memcpy(ent, plt, sizeof(plt));
-    *(ul32 *)(ent + 12) = sym->get_gotplt_addr(ctx) - sym->get_plt_addr(ctx) - 12;
-  }
-}
-
-template <>
-void PltGotSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-
-  for (Symbol<E> *sym : symbols) {
-    static const u32 plt[] = {
-      0xe59fc004, // 1: ldr ip, 2f
-      0xe08cc00f, // add ip, ip, pc
-      0xe59cf000, // ldr pc, [ip]
-      0x00000000, // 2: .word sym@GOT - 1b
-    };
-
-    u8 *ent = buf + sym->get_pltgot_idx(ctx) * sizeof(plt);
-    memcpy(ent, plt, sizeof(plt));
-    *(ul32 *)(ent + 12) = sym->get_got_addr(ctx) - sym->get_plt_addr(ctx) - 12;
-  }
-}
-
-// ARM does not use .eh_frame for exception handling. Instead, it uses
-// .ARM.exidx and .ARM.extab. So this function is empty.
-template <>
-void EhFrameSection<E>::apply_reloc(Context<E> &ctx, const ElfRel<E> &rel,
-                                    u64 offset, u64 val) {}
-
-template <>
-void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
-  ElfRel<E> *dynrel = nullptr;
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  i64 frag_idx = 0;
-
-  if (ctx.reldyn)
-    dynrel = (ElfRel<E> *)(ctx.buf + ctx.reldyn->shdr.sh_offset +
-                           file.reldyn_offset + this->reldyn_offset);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_ARM_NONE || rel.r_type == R_ARM_V4BX)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = base + rel.r_offset;
-
-    const SectionFragmentRef<E> *frag_ref = nullptr;
-    if (rel_fragments && rel_fragments[frag_idx].idx == i)
-      frag_ref = &rel_fragments[frag_idx++];
-
-#define S   (frag_ref ? frag_ref->frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A   (frag_ref ? frag_ref->addend : this->get_addend(rel))
-#define P   (output_section->shdr.sh_addr + offset + rel.r_offset)
-#define T   (sym.get_addr(ctx) & 1)
-#define G   (sym.get_got_addr(ctx) - ctx.got->shdr.sh_addr)
-#define GOT ctx.got->shdr.sh_addr
-
-    switch (rel.r_type) {
-    case R_ARM_ABS32:
-    case R_ARM_TARGET1:
-      if (sym.is_absolute() || !ctx.arg.pic) {
-        *(ul32 *)loc = S + A;
-      } else if (sym.is_imported) {
-        *dynrel++ = ElfRel<E>(P, R_ARM_ABS32, sym.get_dynsym_idx(ctx));
-      } else {
-        if (!is_relr_reloc(ctx, rel))
-          *dynrel++ = ElfRel<E>(P, R_ARM_RELATIVE, 0);
-        *(ul32 *)loc = S + A;
-      }
-      continue;
-    case R_ARM_REL32:
-      *(ul32 *)loc = S + A - P;
-      continue;
-    case R_ARM_THM_CALL:
-      // THM_CALL relocation refers either BL or BLX instruction.
-      // They are different in only one bit. We need to use BL if
-      // the jump target is Thumb. Otherwise, use BLX.
-      if (sym.esym().is_undef_weak()) {
-        // On ARM, calling an weak undefined symbol jumps to the
-        // next instruction.
-        write_thm_b_imm(loc, 4);
-        *(ul16 *)(loc + 2) |= 0x1000;  // rewrite with BL
-      } else if (T) {
-        write_thm_b_imm(loc, S + A - P);
-        *(ul16 *)(loc + 2) |= 0x1000;  // rewrite with BL
-      } else {
-        write_thm_b_imm(loc, align_to(S + A - P, 4));
-        *(ul16 *)(loc + 2) &= ~0x1000; // rewrite with BLX
-      }
-      continue;
-    case R_ARM_BASE_PREL:
-      *(ul32 *)loc = GOT + A - P;
-      continue;
-    case R_ARM_GOT_PREL:
-      *(ul32 *)loc = G + A - P;
-      continue;
-    case R_ARM_GOT_BREL:
-      *(ul32 *)loc = G + A;
-      continue;
-    case R_ARM_TARGET2:
-      *(ul32 *)loc = GOT + G + A - P;
-      continue;
-    case R_ARM_CALL: {
-      // Just like THM_CALL, ARM_CALL relocation refers either BL or
-      // BLX instruction. We may need to rewrite BL → BLX or BLX → BL.
-      bool is_bl = ((*(ul32 *)loc & 0xff00'0000) == 0xeb00'0000);
-      bool is_blx = ((*(ul32 *)loc & 0xfe00'0000) == 0xfa00'0000);
-      if (!is_bl && !is_blx)
-        Fatal(ctx) << *this << ": R_ARM_CALL refers neither BL nor BLX";
-
-      if (sym.esym().is_undef_weak()) {
-        // On ARM, calling an weak undefined symbol jumps to the
-        // next instruction.
-        *(ul32 *)loc = 0xeb00'0001;
-      } else if (T) {
-        u32 val = S + A - P;
-        *(ul32 *)loc = 0xfa00'0000 | (bit(val, 1) << 24) | bits(val, 25, 2);
-      } else {
-        *(ul32 *)loc = 0xeb00'0000 | bits(S + A - P, 25, 2);
-      }
-      continue;
-    }
-    case R_ARM_JUMP24:
-      if (sym.esym().is_undef_weak())
-        *(ul32 *)loc = (*(ul32 *)loc & 0xff00'0000) | 1;
-      else
-        *(ul32 *)loc = (*(ul32 *)loc & 0xff00'0000) | bits(S + A - P, 25, 2);
-      continue;
-    case R_ARM_THM_JUMP11:
-      assert(T);
-      *(ul16 *)loc = (*(ul16 *)loc & 0xf800) | bits(S + A - P, 11, 1);
-      continue;
-    case R_ARM_THM_JUMP24:
-      if (T) {
-        write_thm_b_imm(loc, S + A - P);
-      } else {
-        assert(sym.extra.thumb_to_arm_thunk_idx != -1);
-        u64 thunk_addr =
-          ctx.thumb_to_arm->shdr.sh_addr +
-          sym.extra.thumb_to_arm_thunk_idx * ThumbToArmSection::ENTRY_SIZE;
-        write_thm_b_imm(loc, thunk_addr - P - 4);
-      }
-      continue;
-    case R_ARM_MOVW_PREL_NC:
-      write_mov_imm(loc, ((S + A) | T) - P);
-      continue;
-    case R_ARM_MOVW_ABS_NC:
-      write_mov_imm(loc, (S + A) | T);
-      continue;
-    case R_ARM_THM_MOVW_PREL_NC:
-      write_thm_mov_imm(loc, ((S + A) | T) - P);
-      continue;
-    case R_ARM_PREL31:
-      *(ul32 *)loc = (*(ul32 *)loc & 0x8000'0000) | ((S + A - P) & 0x7fff'ffff);
-      continue;
-    case R_ARM_THM_MOVW_ABS_NC:
-      write_thm_mov_imm(loc, (S + A) | T);
-      continue;
-    case R_ARM_MOVT_PREL:
-      write_mov_imm(loc, (S + A - P) >> 16);
-      continue;
-    case R_ARM_THM_MOVT_PREL:
-      write_thm_mov_imm(loc, (S + A - P) >> 16);
-      continue;
-    case R_ARM_MOVT_ABS:
-      write_mov_imm(loc, (S + A) >> 16);
-      continue;
-    case R_ARM_THM_MOVT_ABS:
-      write_thm_mov_imm(loc, (S + A) >> 16);
-      continue;
-    case R_ARM_TLS_GD32:
-      *(ul32 *)loc = sym.get_tlsgd_addr(ctx) + A - P;
-      continue;
-    case R_ARM_TLS_LDM32:
-      *(ul32 *)loc = ctx.got->get_tlsld_addr(ctx) + A - P;
-      continue;
-    case R_ARM_TLS_LDO32:
-      *(ul32 *)loc = S + A - ctx.tls_begin;
-      continue;
-    case R_ARM_TLS_IE32:
-      *(ul32 *)loc = sym.get_gottp_addr(ctx) + A - P;
-      continue;
-    case R_ARM_TLS_LE32:
-      *(ul32 *)loc = S + A - ctx.tls_begin + E::tls_offset;
-      continue;
-    case R_ARM_TLS_GOTDESC:
-      if (sym.get_tlsdesc_idx(ctx) == -1)
-        *(ul32 *)loc = S - ctx.tls_begin + E::tls_offset;
-      else
-        *(ul32 *)loc = sym.get_tlsdesc_addr(ctx) + A - P - 6;
-      continue;
-    case R_ARM_THM_TLS_CALL:
-      if (sym.get_tlsdesc_idx(ctx) == -1) {
-        // BL -> NOP
-        *(ul32 *)loc = 0x8000f3af;
-      } else {
-        u64 addr = ctx.tls_trampoline->shdr.sh_addr;
-        write_thm_b_imm(loc, align_to(addr - P - 4, 4));
-        *(ul16 *)(loc + 2) &= ~(1 << 12); // rewrite BL with BLX
-      }
-      continue;
-    default:
-      Error(ctx) << *this << ": unknown relocation: " << rel;
-    }
-
-#undef S
-#undef A
-#undef P
-#undef T
-#undef G
-#undef GOT
-  }
-}
-
-template <>
-void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_ARM_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = base + rel.r_offset;
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    SectionFragment<E> *frag;
-    i64 addend;
-    std::tie(frag, addend) = get_fragment(ctx, rel);
-
-#define S (frag ? frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A (frag ? addend : this->get_addend(rel))
-
-    switch (rel.r_type) {
-    case R_ARM_ABS32:
-      if (!frag) {
-        if (std::optional<u64> val = get_tombstone(sym)) {
-          *(ul32 *)loc = *val;
-          break;
-        }
-      }
-      *(ul32 *)loc = S + A;
-      break;
-    case R_ARM_TLS_LDO32:
-      if (std::optional<u64> val = get_tombstone(sym))
-        *(ul32 *)loc = *val;
-      else
-        *(ul32 *)loc = S + A - ctx.tls_begin;
-      break;
-    default:
-      Fatal(ctx) << *this << ": invalid relocation for non-allocated sections: "
-                 << rel;
-      break;
-    }
-
-#undef S
-#undef A
-  }
-}
-
-template <>
-void InputSection<E>::scan_relocations(Context<E> &ctx) {
-  assert(shdr().sh_flags & SHF_ALLOC);
-
-  this->reldyn_offset = file.num_dynrel * sizeof(ElfRel<E>);
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  // Scan relocations
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_ARM_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    if (sym.get_type() == STT_GNU_IFUNC) {
-      sym.flags |= NEEDS_GOT;
-      sym.flags |= NEEDS_PLT;
-    }
-
-    switch (rel.r_type) {
-    case R_ARM_ABS32:
-    case R_ARM_MOVT_ABS:
-    case R_ARM_THM_MOVT_ABS:
-    case R_ARM_TARGET1: {
-      Action table[][4] = {
-        // Absolute  Local    Imported data  Imported code
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // DSO
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // PIE
-        {  NONE,     NONE,    COPYREL,       CPLT   },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_ARM_REL32:
-    case R_ARM_BASE_PREL:
-      break;
-    case R_ARM_THM_CALL: {
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  NONE,     NONE,  PLT,           PLT    },     // DSO
-        {  NONE,     NONE,  PLT,           PLT    },     // PIE
-        {  NONE,     NONE,  PLT,           PLT    },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_ARM_GOT_PREL:
-    case R_ARM_GOT_BREL:
-    case R_ARM_TARGET2:
-      sym.flags |= NEEDS_GOT;
-      break;
-    case R_ARM_CALL:
-    case R_ARM_JUMP24:
-      if (sym.is_imported)
-        sym.flags |= NEEDS_PLT;
-      break;
-    case R_ARM_THM_JUMP24:
-      if (sym.is_imported || sym.get_type() == STT_GNU_IFUNC)
-        sym.flags |= NEEDS_PLT | NEEDS_THUMB_TO_ARM_THUNK;
-      else if (sym.esym().st_value % 2 == 0)
-        sym.flags |= NEEDS_THUMB_TO_ARM_THUNK;
-      break;
-    case R_ARM_MOVT_PREL:
-    case R_ARM_THM_MOVT_PREL:
-    case R_ARM_PREL31: {
-      Action table[][4] = {
-        // Absolute  Local    Imported data  Imported code
-        {  ERROR,    NONE,    ERROR,         PLT   },      // DSO
-        {  ERROR,    NONE,    COPYREL,       PLT   },      // PIE
-        {  NONE,     NONE,    COPYREL,       PLT   },      // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_ARM_TLS_GD32:
-      sym.flags |= NEEDS_TLSGD;
-      break;
-    case R_ARM_TLS_LDM32:
-      ctx.needs_tlsld = true;
-      break;
-    case R_ARM_TLS_IE32:
-      sym.flags |= NEEDS_GOTTP;
-      break;
-    case R_ARM_TLS_GOTDESC:
-      if (!ctx.relax_tlsdesc || sym.is_imported)
-        sym.flags |= NEEDS_TLSDESC;
-      break;
-    case R_ARM_THM_JUMP11:
-    case R_ARM_MOVW_PREL_NC:
-    case R_ARM_MOVW_ABS_NC:
-    case R_ARM_THM_MOVW_PREL_NC:
-    case R_ARM_THM_MOVW_ABS_NC:
-    case R_ARM_TLS_LDO32:
-    case R_ARM_TLS_LE32:
-    case R_ARM_THM_TLS_CALL:
-    case R_ARM_V4BX:
-      break;
-    default:
-      Error(ctx) << *this << ": unknown relocation: " << rel;
-    }
-  }
-}
-
-// If a function referenced by a Thumb B (branch) instruction is
-// resovled to a non-thumb function, we can't directly jump from the
-// thumb function to the ARM function. We can't rewrite B with BX
-// because there's no such BX instruction that takes an immediate.
-// BX takes only a register.
-//
-// In order to support such branch, we insert a small piece of code to
-// the resulting executable which switches the processor mode from
-// Thumb to ARM. This section contains such code.
-void ThumbToArmSection::add_symbol(Context<E> &ctx, Symbol<E> *sym) {
-  if (sym->extra.thumb_to_arm_thunk_idx == -1) {
-    sym->extra.thumb_to_arm_thunk_idx = symbols.size();
-    symbols.push_back(sym);
-  }
-}
-
-void ThumbToArmSection::update_shdr(Context<E> &ctx) {
-  this->shdr.sh_size = symbols.size() * ENTRY_SIZE;
-}
-
-void ThumbToArmSection::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-  i64 offset = 0;
-
-  static u8 insn[] = {
-    0x40, 0xf2, 0x00, 0x0c, // movw ip, $0
-    0xc0, 0xf2, 0x00, 0x0c, // movt ip, $0
-    0xfc, 0x44,             // add  ip, pc
-    0x60, 0x47,             // bx   ip
-  };
-
-  static_assert(sizeof(insn) == ENTRY_SIZE);
-
-  for (Symbol<E> *sym : symbols) {
-    memcpy(buf + offset, insn, sizeof(insn));
-
-    u32 val = sym->get_addr(ctx) - this->shdr.sh_addr - offset - 12;
-    write_thm_mov_imm(buf + offset, val);
-    write_thm_mov_imm(buf + offset + 4, val >> 16);
-    offset += sizeof(insn);
-  }
-}
-
-void TlsTrampolineSection::copy_buf(Context<E> &ctx) {
-  // Trampoline code for TLSDESC
-  static u32 insn[] = {
-    0xe08e0000, // add r0, lr, r0
-    0xe5901004, // ldr r1, [r0, #4]
-    0xe12fff11, // bx  r1
-  };
-  memcpy(ctx.buf + this->shdr.sh_offset, insn, sizeof(insn));
-}
-
-template <typename E>
-static OutputSection<E> *find_exidx_section(Context<E> &ctx) {
-  for (std::unique_ptr<OutputSection<E>> &osec : ctx.output_sections)
-    if (osec->shdr.sh_type == SHT_ARM_EXIDX)
-      return osec.get();
-  return nullptr;
-}
-
-// ARM executables use an .ARM.exidx section to look up an exception
-// handling record for the current instruction pointer. The table needs
-// to be sorted by their addresses.
-//
-// Other target uses .eh_frame_hdr instead for the same purpose.
-// I don't know why only ARM uses the different mechanism, but it's
-// likely that it's due to some historical reason.
-//
-// This function sorts .ARM.exidx records.
-void sort_arm_exidx(Context<E> &ctx) {
-  Timer t(ctx, "sort_arm_exidx");
-
-  OutputSection<E> *osec = find_exidx_section(ctx);
-  if (!osec)
-    return;
-
-  // .ARM.exidx records consists of a signed 31-bit relative address
-  // and a 32-bit value. The relative address indicates the start
-  // address of a function that the record covers. The value is one of
-  // the followings:
-  //
-  // 1. CANTUNWIND indicating that there's no unwinding info for the function,
-  // 2. a compact unwinding record encoded into a 32-bit value, or
-  // 3. a 31-bit relative address which points to a larger record in
-  //    the .ARM.extab section.
-  //
-  // CANTUNWIND is value 1. The most significant bit is set in (2) but
-  // not in (3). So we can distinguished them just by looking at a value.
-  const u32 EXIDX_CANTUNWIND = 1;
-
-  struct Entry {
-    ul32 addr;
-    ul32 val;
-  };
-
-  if (osec->shdr.sh_size % sizeof(Entry))
-    Fatal(ctx) << "invalid .ARM.exidx section size";
-
-  Entry *ent = (Entry *)(ctx.buf + osec->shdr.sh_offset);
-  i64 num_entries = osec->shdr.sh_size / sizeof(Entry);
-
-  // Entry's addresses are relative to the beginning of their entries.
-  // We first translate them so that they are relative to the
-  // beginning of the section. We then sort the records and then
-  // translate them back to be relative to each record.
-
-  auto is_relative = [](u32 val) {
-    return val != EXIDX_CANTUNWIND && !(val & 0x8000'0000);
-  };
-
-  tbb::parallel_for((i64)0, num_entries, [&](i64 i) {
-    i64 offset = sizeof(Entry) * i;
-    ent[i].addr = sign_extend(ent[i].addr, 30) - offset;
-    if (is_relative(ent[i].val))
-      ent[i].val = 0x7fff'ffff & (sign_extend(ent[i].val, 30) - offset);
-  });
-
-  tbb::parallel_sort(ent, ent + num_entries, [](const Entry &a, const Entry &b) {
-    return a.addr < b.addr;
-  });
-
-  // Write back the sorted records while adjusting relative addresses
-  tbb::parallel_for((i64)0, num_entries, [&](i64 i) {
-    i64 offset = sizeof(Entry) * i;
-    ent[i].addr = 0x7fff'ffff & (ent[i].addr + offset);
-    if (is_relative(ent[i].val))
-      ent[i].val = 0x7fff'ffff & (ent[i].val + offset);
-  });
-}
-
-} // namespace mold::elf

elf/arch-arm64.cc

@@ -1,692 +0,0 @@
-#include "mold.h"
-
-#include <tbb/parallel_for.h>
-#include <tbb/parallel_for_each.h>
-
-namespace mold::elf {
-
-using E = ARM64;
-
-static void write_adrp(u8 *buf, u64 val) {
-  u32 hi = bits(val, 32, 14);
-  u32 lo = bits(val, 13, 12);
-  u32 op = *(ul32 *)buf & 0b1001'1111'0000'0000'0000'0000'0001'1111;
-  *(ul32 *)buf = (lo << 29) | (hi << 5) | op;
-}
-
-static void write_adr(u8 *buf, u64 val) {
-  u32 hi = bits(val, 20, 2);
-  u32 lo = bits(val, 1, 0);
-  u32 op = *(ul32 *)buf & 0b1001'1111'0000'0000'0000'0000'0001'1111;
-  *(ul32 *)buf = (lo << 29) | (hi << 5) | op;
-}
-
-static u64 page(u64 val) {
-  return val & ~(u64)0xfff;
-}
-
-static void write_plt_header(Context<E> &ctx, u8 *buf) {
-  // Write PLT header
-  static const u32 plt0[] = {
-    0xa9bf7bf0, // stp  x16, x30, [sp,#-16]!
-    0x90000010, // adrp x16, .got.plt[2]
-    0xf9400211, // ldr  x17, [x16, .got.plt[2]]
-    0x91000210, // add  x16, x16, .got.plt[2]
-    0xd61f0220, // br   x17
-    0xd503201f, // nop
-    0xd503201f, // nop
-    0xd503201f, // nop
-  };
-
-  u64 gotplt = ctx.gotplt->shdr.sh_addr + 16;
-  u64 plt = ctx.plt->shdr.sh_addr;
-
-  memcpy(buf, plt0, sizeof(plt0));
-  write_adrp(buf + 4, page(gotplt) - page(plt + 4));
-  *(ul32 *)(buf + 8) |= bits(gotplt, 11, 3) << 10;
-  *(ul32 *)(buf + 12) |= (gotplt & 0xfff) << 10;
-}
-
-static void write_plt_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
-  u8 *ent = buf + E::plt_hdr_size + sym.get_plt_idx(ctx) * E::plt_size;
-
-  static const u32 data[] = {
-    0x90000010, // adrp x16, .got.plt[n]
-    0xf9400211, // ldr  x17, [x16, .got.plt[n]]
-    0x91000210, // add  x16, x16, .got.plt[n]
-    0xd61f0220, // br   x17
-  };
-
-  u64 gotplt = sym.get_gotplt_addr(ctx);
-  u64 plt = sym.get_plt_addr(ctx);
-
-  memcpy(ent, data, sizeof(data));
-  write_adrp(ent, page(gotplt) - page(plt));
-  *(ul32 *)(ent + 4) |= bits(gotplt, 11, 3) << 10;
-  *(ul32 *)(ent + 8) |= (gotplt & 0xfff) << 10;
-}
-
-template <>
-void PltSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-  write_plt_header(ctx, buf);
-  for (Symbol<E> *sym : symbols)
-    write_plt_entry(ctx, buf, *sym);
-}
-
-template <>
-void PltGotSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-
-  for (Symbol<E> *sym : symbols) {
-    u8 *ent = buf + sym->get_pltgot_idx(ctx) * ARM64::pltgot_size;
-
-    static const u32 data[] = {
-      0x90000010, // adrp x16, GOT[n]
-      0xf9400211, // ldr  x17, [x16, GOT[n]]
-      0xd61f0220, // br   x17
-      0xd503201f, // nop
-    };
-
-    u64 got = sym->get_got_addr(ctx);
-    u64 plt = sym->get_plt_addr(ctx);
-
-    memcpy(ent, data, sizeof(data));
-    write_adrp(ent, page(got) - page(plt));
-    *(ul32 *)(ent + 4) |= bits(got, 11, 3) << 10;
-  }
-}
-
-template <>
-void EhFrameSection<E>::apply_reloc(Context<E> &ctx, const ElfRel<E> &rel,
-                                    u64 offset, u64 val) {
-  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
-
-  switch (rel.r_type) {
-  case R_AARCH64_ABS64:
-    *(ul64 *)loc = val;
-    return;
-  case R_AARCH64_PREL32:
-    *(ul32 *)loc = val - this->shdr.sh_addr - offset;
-    return;
-  case R_AARCH64_PREL64:
-    *(ul64 *)loc = val - this->shdr.sh_addr - offset;
-    return;
-  }
-  Fatal(ctx) << "unsupported relocation in .eh_frame: " << rel;
-}
-
-template <>
-void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
-  ElfRel<E> *dynrel = nullptr;
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  i64 frag_idx = 0;
-
-  if (ctx.reldyn)
-    dynrel = (ElfRel<E> *)(ctx.buf + ctx.reldyn->shdr.sh_offset +
-                           file.reldyn_offset + this->reldyn_offset);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_AARCH64_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = base + rel.r_offset;
-
-    const SectionFragmentRef<E> *frag_ref = nullptr;
-    if (rel_fragments && rel_fragments[frag_idx].idx == i)
-      frag_ref = &rel_fragments[frag_idx++];
-
-    auto overflow_check = [&](i64 val, i64 lo, i64 hi) {
-      if (val < lo || hi <= val)
-        Error(ctx) << *this << ": relocation " << rel << " against "
-                   << sym << " out of range: " << val << " is not in ["
-                   << lo << ", " << hi << ")";
-    };
-
-#define S   (frag_ref ? frag_ref->frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A   (frag_ref ? (u64)frag_ref->addend : (u64)rel.r_addend)
-#define P   (output_section->shdr.sh_addr + offset + rel.r_offset)
-#define G   (sym.get_got_addr(ctx) - ctx.got->shdr.sh_addr)
-#define GOT ctx.got->shdr.sh_addr
-
-    switch (rel.r_type) {
-    case R_AARCH64_ABS64:
-      if (sym.is_absolute() || !ctx.arg.pic) {
-        *(ul64 *)loc = S + A;
-      } else if (sym.is_imported) {
-        *dynrel++ = ElfRel<E>(P, R_AARCH64_ABS64, sym.get_dynsym_idx(ctx), A);
-        *(ul64 *)loc = A;
-      } else {
-        if (!is_relr_reloc(ctx, rel))
-          *dynrel++ = ElfRel<E>(P, R_AARCH64_RELATIVE, 0, S + A);
-        *(ul64 *)loc = S + A;
-      }
-      continue;
-    case R_AARCH64_LDST8_ABS_LO12_NC:
-      *(ul32 *)loc |= bits(S + A, 11, 0) << 10;
-      continue;
-    case R_AARCH64_LDST16_ABS_LO12_NC:
-      *(ul32 *)loc |= bits(S + A, 11, 1) << 10;
-      continue;
-    case R_AARCH64_LDST32_ABS_LO12_NC:
-      *(ul32 *)loc |= bits(S + A, 11, 2) << 10;
-      continue;
-    case R_AARCH64_LDST64_ABS_LO12_NC:
-      *(ul32 *)loc |= bits(S + A, 11, 3) << 10;
-      continue;
-    case R_AARCH64_LDST128_ABS_LO12_NC:
-      *(ul32 *)loc |= bits(S + A, 11, 4) << 10;
-      continue;
-    case R_AARCH64_ADD_ABS_LO12_NC:
-      *(ul32 *)loc |= bits(S + A, 11, 0) << 10;
-      continue;
-    case R_AARCH64_MOVW_UABS_G0:
-    case R_AARCH64_MOVW_UABS_G0_NC:
-      *(ul32 *)loc |= bits(S + A, 15, 0) << 5;
-      continue;
-    case R_AARCH64_MOVW_UABS_G1:
-    case R_AARCH64_MOVW_UABS_G1_NC:
-      *(ul32 *)loc |= bits(S + A, 31, 16) << 5;
-      continue;
-    case R_AARCH64_MOVW_UABS_G2:
-    case R_AARCH64_MOVW_UABS_G2_NC:
-      *(ul32 *)loc |= bits(S + A, 47, 32) << 5;
-      continue;
-    case R_AARCH64_MOVW_UABS_G3:
-      *(ul32 *)loc |= bits(S + A, 63, 48) << 5;
-      continue;
-    case R_AARCH64_ADR_GOT_PAGE: {
-      i64 val = page(G + GOT + A) - page(P);
-      overflow_check(val, -((i64)1 << 32), (i64)1 << 32);
-      write_adrp(loc, val);
-      continue;
-    }
-    case R_AARCH64_ADR_PREL_PG_HI21: {
-      i64 val = page(S + A) - page(P);
-      overflow_check(val, -((i64)1 << 32), (i64)1 << 32);
-      write_adrp(loc, val);
-      continue;
-    }
-    case R_AARCH64_ADR_PREL_LO21: {
-      i64 val = S + A - P;
-      overflow_check(val, -((i64)1 << 20), (i64)1 << 20);
-      write_adr(loc, val);
-      continue;
-    }
-    case R_AARCH64_CALL26:
-    case R_AARCH64_JUMP26: {
-      if (sym.esym().is_undef_weak()) {
-        // On ARM, calling an weak undefined symbol jumps to the
-        // next instruction.
-        *(ul32 *)loc |= 1;
-        continue;
-      }
-
-      i64 lo = -(1 << 27);
-      i64 hi = 1 << 27;
-      i64 val = S + A - P;
-
-      if (val < lo || hi <= val) {
-        RangeExtensionRef ref = extra.range_extn[i];
-        val = output_section->thunks[ref.thunk_idx]->get_addr(ref.sym_idx) + A - P;
-        assert(lo <= val && val < hi);
-      }
-
-      *(ul32 *)loc |= (val >> 2) & 0x3ffffff;
-      continue;
-    }
-    case R_AARCH64_CONDBR19:
-    case R_AARCH64_LD_PREL_LO19: {
-      i64 val = S + A - P;
-      overflow_check(val, -((i64)1 << 20), (i64)1 << 20);
-      *(ul32 *)loc |= bits(val, 20, 2) << 5;
-      continue;
-    }
-    case R_AARCH64_PREL16: {
-      i64 val = S + A - P;
-      overflow_check(val, -((i64)1 << 15), (i64)1 << 15);
-      *(ul16 *)loc = val;
-      continue;
-    }
-    case R_AARCH64_PREL32: {
-      i64 val = S + A - P;
-      overflow_check(val, -((i64)1 << 31), (i64)1 << 32);
-      *(ul32 *)loc = val;
-      continue;
-    }
-    case R_AARCH64_PREL64:
-      *(ul64 *)loc = S + A - P;
-      continue;
-    case R_AARCH64_LD64_GOT_LO12_NC:
-      *(ul32 *)loc |= bits(G + GOT + A, 11, 3) << 10;
-      continue;
-    case R_AARCH64_LD64_GOTPAGE_LO15: {
-      i64 val = G + GOT + A - page(GOT);
-      overflow_check(val, 0, 1 << 15);
-      *(ul32 *)loc |= bits(val, 14, 3) << 10;
-      continue;
-    }
-    case R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: {
-      i64 val = page(sym.get_gottp_addr(ctx) + A) - page(P);
-      overflow_check(val, -((i64)1 << 32), (i64)1 << 32);
-      write_adrp(loc, val);
-      continue;
-    }
-    case R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
-      *(ul32 *)loc |= bits(sym.get_gottp_addr(ctx) + A, 11, 3) << 10;
-      continue;
-    case R_AARCH64_TLSLE_ADD_TPREL_HI12: {
-      i64 val = S + A - ctx.tls_begin + E::tls_offset;
-      overflow_check(val, 0, (i64)1 << 24);
-      *(ul32 *)loc |= bits(val, 23, 12) << 10;
-      continue;
-    }
-    case R_AARCH64_TLSLE_ADD_TPREL_LO12:
-    case R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
-      *(ul32 *)loc |= bits(S + A - ctx.tls_begin + E::tls_offset, 11, 0) << 10;
-      continue;
-    case R_AARCH64_TLSGD_ADR_PAGE21: {
-      i64 val = page(sym.get_tlsgd_addr(ctx) + A) - page(P);
-      overflow_check(val, -((i64)1 << 32), (i64)1 << 32);
-      write_adrp(loc, val);
-      continue;
-    }
-    case R_AARCH64_TLSGD_ADD_LO12_NC:
-      *(ul32 *)loc |= bits(sym.get_tlsgd_addr(ctx) + A, 11, 0) << 10;
-      continue;
-    case R_AARCH64_TLSDESC_ADR_PAGE21: {
-      if (ctx.relax_tlsdesc && !sym.is_imported) {
-        // adrp x0, 0 -> movz x0, #tls_ofset_hi, lsl #16
-        i64 val = (S + A - ctx.tls_begin + E::tls_offset);
-        overflow_check(val, -((i64)1 << 32), (i64)1 << 32);
-        *(ul32 *)loc = 0xd2a00000 | (bits(val, 32, 16) << 5);
-      } else {
-        i64 val = page(sym.get_tlsdesc_addr(ctx) + A) - page(P);
-        overflow_check(val, -((i64)1 << 32), (i64)1 << 32);
-        write_adrp(loc, val);
-      }
-      continue;
-    }
-    case R_AARCH64_TLSDESC_LD64_LO12:
-      if (ctx.relax_tlsdesc && !sym.is_imported) {
-        // ldr x2, [x0] -> movk x0, #tls_ofset_lo
-        u32 offset_lo = (S + A - ctx.tls_begin + E::tls_offset) & 0xffff;
-        *(ul32 *)loc = 0xf2800000 | (offset_lo << 5);
-      } else {
-        *(ul32 *)loc |= bits(sym.get_tlsdesc_addr(ctx) + A, 11, 3) << 10;
-      }
-      continue;
-    case R_AARCH64_TLSDESC_ADD_LO12:
-      if (ctx.relax_tlsdesc && !sym.is_imported) {
-        // add x0, x0, #0 -> nop
-        *(ul32 *)loc = 0xd503201f;
-      } else {
-        *(ul32 *)loc |= bits(sym.get_tlsdesc_addr(ctx) + A, 11, 0) << 10;
-      }
-      continue;
-    case R_AARCH64_TLSDESC_CALL:
-      if (ctx.relax_tlsdesc && !sym.is_imported) {
-        // blr x2 -> nop
-        *(ul32 *)loc = 0xd503201f;
-      }
-      continue;
-    default:
-      unreachable();
-    }
-
-#undef S
-#undef A
-#undef P
-#undef G
-#undef GOT
-  }
-}
-
-template <>
-void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_AARCH64_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = base + rel.r_offset;
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    SectionFragment<E> *frag;
-    i64 addend;
-    std::tie(frag, addend) = get_fragment(ctx, rel);
-
-#define S (frag ? frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A (frag ? (u64)addend : (u64)rel.r_addend)
-
-    switch (rel.r_type) {
-    case R_AARCH64_ABS64:
-      if (!frag) {
-        if (std::optional<u64> val = get_tombstone(sym)) {
-          *(ul64 *)loc = *val;
-          break;
-        }
-      }
-      *(ul64 *)loc = S + A;
-      continue;
-    case R_AARCH64_ABS32:
-      *(ul32 *)loc = S + A;
-      continue;
-    default:
-      Fatal(ctx) << *this << ": invalid relocation for non-allocated sections: "
-                 << rel;
-      break;
-    }
-
-#undef S
-#undef A
-  }
-}
-
-template <>
-void InputSection<E>::scan_relocations(Context<E> &ctx) {
-  assert(shdr().sh_flags & SHF_ALLOC);
-
-  this->reldyn_offset = file.num_dynrel * sizeof(ElfRel<E>);
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  // Scan relocations
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_AARCH64_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    if (sym.get_type() == STT_GNU_IFUNC) {
-      sym.flags |= NEEDS_GOT;
-      sym.flags |= NEEDS_PLT;
-    }
-
-    switch (rel.r_type) {
-    case R_AARCH64_ABS64: {
-      Action table[][4] = {
-        // Absolute  Local    Imported data  Imported code
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // DSO
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // PIE
-        {  NONE,     NONE,    COPYREL,       CPLT   },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_AARCH64_ADR_GOT_PAGE:
-    case R_AARCH64_LD64_GOT_LO12_NC:
-    case R_AARCH64_LD64_GOTPAGE_LO15:
-      sym.flags |= NEEDS_GOT;
-      break;
-    case R_AARCH64_CALL26:
-    case R_AARCH64_JUMP26:
-      if (sym.is_imported)
-        sym.flags |= NEEDS_PLT;
-      break;
-    case R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
-    case R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
-      sym.flags |= NEEDS_GOTTP;
-      break;
-    case R_AARCH64_ADR_PREL_PG_HI21: {
-      Action table[][4] = {
-        // Absolute  Local    Imported data  Imported code
-        {  ERROR,    NONE,    ERROR,         ERROR },      // DSO
-        {  ERROR,    NONE,    COPYREL,       PLT   },      // PIE
-        {  NONE,     NONE,    COPYREL,       CPLT  },      // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_AARCH64_TLSGD_ADR_PAGE21:
-      sym.flags |= NEEDS_TLSGD;
-      break;
-    case R_AARCH64_TLSDESC_ADR_PAGE21:
-    case R_AARCH64_TLSDESC_LD64_LO12:
-    case R_AARCH64_TLSDESC_ADD_LO12:
-      if (!ctx.relax_tlsdesc || sym.is_imported)
-        sym.flags |= NEEDS_TLSDESC;
-      break;
-    case R_AARCH64_ADD_ABS_LO12_NC:
-    case R_AARCH64_ADR_PREL_LO21:
-    case R_AARCH64_CONDBR19:
-    case R_AARCH64_LD_PREL_LO19:
-    case R_AARCH64_LDST16_ABS_LO12_NC:
-    case R_AARCH64_LDST32_ABS_LO12_NC:
-    case R_AARCH64_LDST64_ABS_LO12_NC:
-    case R_AARCH64_LDST128_ABS_LO12_NC:
-    case R_AARCH64_LDST8_ABS_LO12_NC:
-    case R_AARCH64_MOVW_UABS_G0:
-    case R_AARCH64_MOVW_UABS_G0_NC:
-    case R_AARCH64_MOVW_UABS_G1:
-    case R_AARCH64_MOVW_UABS_G1_NC:
-    case R_AARCH64_MOVW_UABS_G2:
-    case R_AARCH64_MOVW_UABS_G2_NC:
-    case R_AARCH64_MOVW_UABS_G3:
-    case R_AARCH64_PREL16:
-    case R_AARCH64_PREL32:
-    case R_AARCH64_PREL64:
-    case R_AARCH64_TLSLE_ADD_TPREL_HI12:
-    case R_AARCH64_TLSLE_ADD_TPREL_LO12:
-    case R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
-    case R_AARCH64_TLSGD_ADD_LO12_NC:
-    case R_AARCH64_TLSDESC_CALL:
-      break;
-    default:
-      Error(ctx) << *this << ": unknown relocation: " << rel;
-    }
-  }
-}
-
-static void reset_thunk(RangeExtensionThunk<E> &thunk) {
-  for (Symbol<E> *sym : thunk.symbols) {
-    sym->extra.thunk_idx = -1;
-    sym->extra.thunk_sym_idx = -1;
-    sym->flags = 0;
-  }
-}
-
-static bool is_reachable(Context<E> &ctx, Symbol<E> &sym,
-                         InputSection<E> &isec, const ElfRel<E> &rel) {
-  // We pessimistically assume that PLT entries are unreacahble.
-  if (sym.has_plt(ctx))
-    return false;
-
-  // We create thunks with a pessimistic assumption that all
-  // out-of-section relocations would be out-of-range.
-  InputSection<E> *isec2 = sym.get_input_section();
-  if (!isec2 || isec.output_section != isec2->output_section)
-    return false;
-
-  if (isec2->offset == -1)
-    return false;
-
-  // Compute a distance between the relocated place and the symbol
-  // and check if they are within reach.
-  i64 S = sym.get_addr(ctx);
-  i64 A = rel.r_addend;
-  i64 P = isec.get_addr() + rel.r_offset;
-  i64 val = S + A - P;
-  return -(1 << 27) <= val && val < (1 << 27);
-}
-
-// We create a thunk no further than 100 MiB from any section.
-static constexpr i64 MAX_DISTANCE = 100 * 1024 * 1024;
-
-// We create a thunk for each 10 MiB input sections.
-static constexpr i64 GROUP_SIZE = 10 * 1024 * 1024;
-
-// ARM64's call/jump instructions take 27 bits displacement, so they
-// can refer only up to ±128 MiB. If a branch target is further than
-// that, we need to let it branch to a linker-synthesized code
-// sequence that construct a full 32 bit address in a register and
-// jump there. That linker-synthesized code is called "thunk".
-void create_range_extension_thunks(Context<E> &ctx, OutputSection<E> &osec) {
-  std::span<InputSection<E> *> members = osec.members;
-  if (members.empty())
-    return;
-
-  members[0]->offset = 0;
-
-  // Initialize input sections with a dummy offset so that we can
-  // distinguish sections that have got an address with the one who
-  // haven't.
-  tbb::parallel_for((i64)1, (i64)members.size(), [&](i64 i) {
-    members[i]->offset = -1;
-  });
-
-  // We create thunks from the beginning of the section to the end.
-  // We manage progress using four offsets which increase monotonically.
-  // The locations they point to are always A <= B <= C <= D.
-  i64 a = 0;
-  i64 b = 0;
-  i64 c = 0;
-  i64 d = 0;
-  i64 offset = 0;
-
-  while (b < members.size()) {
-    // Move D foward as far as we can jump from B to D.
-    while (d < members.size() && offset - members[b]->offset < MAX_DISTANCE) {
-      offset = align_to(offset, 1 << members[d]->p2align);
-      members[d]->offset = offset;
-      offset += members[d]->sh_size;
-      d++;
-    }
-
-    // Move C forward so that C is apart from B by GROUP_SIZE.
-    while (c < members.size() &&
-           members[c]->offset - members[b]->offset < GROUP_SIZE)
-      c++;
-
-    // Move A forward so that A is reachable from C.
-    if (c > 0) {
-      i64 c_end = members[c - 1]->offset + members[c - 1]->sh_size;
-      while (a < osec.thunks.size() &&
-             osec.thunks[a]->offset < c_end - MAX_DISTANCE)
-        reset_thunk(*osec.thunks[a++]);
-    }
-
-    // Create a thunk for input sections between B and C and place it at D.
-    osec.thunks.emplace_back(new RangeExtensionThunk<E>{osec});
-
-    RangeExtensionThunk<E> &thunk = *osec.thunks.back();
-    thunk.thunk_idx = osec.thunks.size() - 1;
-    thunk.offset = offset;
-
-    // Scan relocations between B and C to collect symbols that need thunks.
-    tbb::parallel_for_each(members.begin() + b, members.begin() + c,
-                           [&](InputSection<E> *isec) {
-      std::span<const ElfRel<E>> rels = isec->get_rels(ctx);
-      std::vector<RangeExtensionRef> &range_extn = isec->extra.range_extn;
-      range_extn.resize(rels.size());
-
-      for (i64 i = 0; i < rels.size(); i++) {
-        const ElfRel<E> &rel = rels[i];
-        if (rel.r_type != R_AARCH64_CALL26 && rel.r_type != R_AARCH64_JUMP26)
-          continue;
-
-        Symbol<E> &sym = *isec->file.symbols[rel.r_sym];
-
-        // Skip if the symbol is undefined. apply_reloc() will report an error.
-        if (!sym.file)
-          continue;
-
-        // Skip if the destination is within reach.
-        if (is_reachable(ctx, sym, *isec, rel))
-          continue;
-
-        // If the symbol is already in another thunk, reuse it.
-        if (sym.extra.thunk_idx != -1) {
-          range_extn[i] = {sym.extra.thunk_idx, sym.extra.thunk_sym_idx};
-          continue;
-        }
-
-        // Otherwise, add the symbol to this thunk if it's not added already.
-        range_extn[i] = {thunk.thunk_idx, -1};
-
-        if (!(sym.flags.fetch_or(NEEDS_RANGE_EXTN_THUNK) &
-              NEEDS_RANGE_EXTN_THUNK)) {
-          std::scoped_lock lock(thunk.mu);
-          thunk.symbols.push_back(&sym);
-        }
-      }
-    });
-
-    // Now that we know the number of symbols in the thunk, we can compute
-    // its size.
-    offset += thunk.size();
-
-    // Sort symbols added to the thunk to make the output deterministic.
-    sort(thunk.symbols, [](Symbol<E> *a, Symbol<E> *b) {
-      return std::tuple{a->file->priority, a->sym_idx} <
-             std::tuple{b->file->priority, b->sym_idx};
-    });
-
-    // Assign offsets within the thunk to the symbols.
-    for (i64 i = 0; Symbol<E> *sym : thunk.symbols) {
-      sym->extra.thunk_idx = thunk.thunk_idx;
-      sym->extra.thunk_sym_idx = i++;
-    }
-
-    // Scan relocations again to fix symbol offsets in the last thunk.
-    tbb::parallel_for_each(members.begin() + b, members.begin() + c,
-                           [&](InputSection<E> *isec) {
-      std::span<const ElfRel<E>> rels = isec->get_rels(ctx);
-
-      for (i64 i = 0; i < rels.size(); i++) {
-        std::vector<RangeExtensionRef> &range_extn = isec->extra.range_extn;
-        if (range_extn[i].thunk_idx == thunk.thunk_idx) {
-          Symbol<E> &sym = *isec->file.symbols[rels[i].r_sym];
-          range_extn[i].sym_idx = sym.extra.thunk_sym_idx;
-        }
-      }
-    });
-
-    // Move B forward to point to the begining of the next group.
-    b = c;
-  }
-
-  while (a < osec.thunks.size())
-    reset_thunk(*osec.thunks[a++]);
-
-  osec.shdr.sh_size = offset;
-}
-
-void RangeExtensionThunk<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + output_section.shdr.sh_offset + offset;
-
-  static const u32 data[] = {
-    0x90000010, // adrp x16, 0   # R_AARCH64_ADR_PREL_PG_HI21
-    0x91000210, // add  x16, x16 # R_AARCH64_ADD_ABS_LO12_NC
-    0xd61f0200, // br   x16
-  };
-
-  static_assert(ENTRY_SIZE == sizeof(data));
-
-  for (i64 i = 0; i < symbols.size(); i++) {
-    u64 S = symbols[i]->get_addr(ctx);
-    u64 P = output_section.shdr.sh_addr + offset + i * ENTRY_SIZE;
-
-    u8 *loc = buf + i * ENTRY_SIZE;
-    memcpy(loc , data, sizeof(data));
-    write_adrp(loc, page(S) - page(P));
-    *(ul32 *)(loc + 4) |= bits(S, 11, 0) << 10;
-  }
-}
-
-} // namespace mold::elf

elf/arch-i386.cc

@@ -1,542 +0,0 @@
-#include "mold.h"
-
-namespace mold::elf {
-
-using E = I386;
-
-// Emitting position-independent code (PIC) for i386 is a bit tricky
-// because i386 doesn't support PC-relative memory access instructions.
-// By default, i386 executables are not PIC. If PIC, %ebx is used to
-// store the location of .got and access all data with offsets from .got.
-static void write_plt_header(Context<E> &ctx, u8 *buf) {
-  if (ctx.arg.pic) {
-    static const u8 plt0[] = {
-      0xff, 0xb3, 0, 0, 0, 0, // pushl GOTPLT+4(%ebx)
-      0xff, 0xa3, 0, 0, 0, 0, // jmp *GOTPLT+8(%ebx)
-      0x90, 0x90, 0x90, 0x90, // nop
-    };
-    memcpy(buf, plt0, sizeof(plt0));
-    *(ul32 *)(buf + 2) = ctx.gotplt->shdr.sh_addr - ctx.got->shdr.sh_addr + 4;
-    *(ul32 *)(buf + 8) = ctx.gotplt->shdr.sh_addr - ctx.got->shdr.sh_addr + 8;
-  } else {
-    static const u8 plt0[] = {
-      0xff, 0x35, 0, 0, 0, 0, // pushl GOTPLT+4
-      0xff, 0x25, 0, 0, 0, 0, // jmp *GOTPLT+8
-      0x90, 0x90, 0x90, 0x90, // nop
-    };
-    memcpy(buf, plt0, sizeof(plt0));
-    *(ul32 *)(buf + 2) = ctx.gotplt->shdr.sh_addr + 4;
-    *(ul32 *)(buf + 8) = ctx.gotplt->shdr.sh_addr + 8;
-  }
-}
-
-static void write_plt_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym,
-                            i64 idx) {
-  u8 *ent = buf + E::plt_hdr_size + sym.get_plt_idx(ctx) * E::plt_size;
-
-  if (ctx.arg.pic) {
-    static const u8 data[] = {
-      0xff, 0xa3, 0, 0, 0, 0, // jmp *foo@GOT(%ebx)
-      0x68, 0,    0, 0, 0,    // pushl $reloc_offset
-      0xe9, 0,    0, 0, 0,    // jmp .PLT0@PC
-    };
-    memcpy(ent, data, sizeof(data));
-    *(ul32 *)(ent + 2) = sym.get_gotplt_addr(ctx) - ctx.got->shdr.sh_addr;
-  } else {
-    static const u8 data[] = {
-      0xff, 0x25, 0, 0, 0, 0, // jmp *foo@GOT
-      0x68, 0,    0, 0, 0,    // pushl $reloc_offset
-      0xe9, 0,    0, 0, 0,    // jmp .PLT0@PC
-    };
-    memcpy(ent, data, sizeof(data));
-    *(ul32 *)(ent + 2) = sym.get_gotplt_addr(ctx);
-  }
-
-  *(ul32 *)(ent + 7) = idx * sizeof(ElfRel<E>);
-  *(ul32 *)(ent + 12) = ctx.plt->shdr.sh_addr - sym.get_plt_addr(ctx) - 16;
-}
-
-template <>
-void PltSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-  write_plt_header(ctx, buf);
-
-  for (i64 i = 0; i < symbols.size(); i++)
-    write_plt_entry(ctx, buf, *symbols[i], i);
-}
-
-template <>
-void PltGotSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-
-  if (ctx.arg.pic) {
-    static const u8 data[] = {
-      0xff, 0xa3, 0, 0, 0, 0, // jmp   *foo@GOT(%ebx)
-      0x66, 0x90,             // nop
-    };
-
-    for (i64 i = 0; i < symbols.size(); i++) {
-      u8 *ent = buf + i * sizeof(data);
-      memcpy(ent, data, sizeof(data));
-      *(ul32 *)(ent + 2) = symbols[i]->get_got_addr(ctx) - ctx.got->shdr.sh_addr;
-    }
-  } else {
-    static const u8 data[] = {
-      0xff, 0x25, 0, 0, 0, 0, // jmp   *foo@GOT
-      0x66, 0x90,             // nop
-    };
-
-    for (i64 i = 0; i < symbols.size(); i++) {
-      u8 *ent = buf + i * sizeof(data);
-      memcpy(ent, data, sizeof(data));
-      *(ul32 *)(ent + 2) = symbols[i]->get_got_addr(ctx);
-    }
-  }
-}
-
-template <>
-void EhFrameSection<E>::apply_reloc(Context<E> &ctx, const ElfRel<E> &rel,
-                                    u64 offset, u64 val) {
-  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
-
-  switch (rel.r_type) {
-  case R_386_NONE:
-    return;
-  case R_386_32:
-    *(ul32 *)loc = val;
-    return;
-  case R_386_PC32:
-    *(ul32 *)loc = val - this->shdr.sh_addr - offset;
-    return;
-  }
-  unreachable();
-}
-
-template <>
-void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
-  ElfRel<E> *dynrel = nullptr;
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-  i64 frag_idx = 0;
-
-  if (ctx.reldyn)
-    dynrel = (ElfRel<E> *)(ctx.buf + ctx.reldyn->shdr.sh_offset +
-                              file.reldyn_offset + this->reldyn_offset);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_386_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = base + rel.r_offset;
-
-    const SectionFragmentRef<E> *frag_ref = nullptr;
-    if (rel_fragments && rel_fragments[frag_idx].idx == i)
-      frag_ref = &rel_fragments[frag_idx++];
-
-    auto overflow_check = [&](i64 val, i64 lo, i64 hi) {
-      if (val < lo || hi <= val)
-        Error(ctx) << *this << ": relocation " << rel << " against "
-                   << sym << " out of range: " << val << " is not in ["
-                   << lo << ", " << hi << ")";
-    };
-
-#define S   (frag_ref ? frag_ref->frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A   (frag_ref ? frag_ref->addend : this->get_addend(rel))
-#define P   (output_section->shdr.sh_addr + offset + rel.r_offset)
-#define G   (sym.get_got_addr(ctx) - ctx.got->shdr.sh_addr)
-#define GOT ctx.got->shdr.sh_addr
-
-    switch (rel.r_type) {
-    case R_386_8: {
-      i64 val = S + A;
-      overflow_check(val, 0, 1 << 8);
-      *loc = val;
-      continue;
-    }
-    case R_386_16: {
-      i64 val = S + A;
-      overflow_check(val, 0, 1 << 16);
-      *(ul16 *)loc = val;
-      continue;
-    }
-    case R_386_32:
-      if (sym.is_absolute() || !ctx.arg.pic) {
-        *(ul32 *)loc = S + A;
-      } else if (sym.is_imported) {
-        *dynrel++ = ElfRel<E>(P, R_386_32, sym.get_dynsym_idx(ctx));
-        *(ul32 *)loc = A;
-      } else {
-        if (!is_relr_reloc(ctx, rel))
-          *dynrel++ = ElfRel<E>(P, R_386_RELATIVE, 0);
-        *(ul32 *)loc = S + A;
-      }
-      continue;
-    case R_386_PC8: {
-      i64 val = S + A;
-      overflow_check(val, -(1 << 7), 1 << 7);
-      *loc = val;
-      continue;
-    };
-    case R_386_PC16: {
-      i64 val = S + A;
-      overflow_check(val, -(1 << 15), 1 << 15);
-      *(ul16 *)loc = val;
-      continue;
-    }
-    case R_386_PC32:
-      if (sym.is_absolute() || !sym.is_imported || !ctx.arg.shared) {
-        *(ul32 *)loc = S + A - P;
-      } else {
-        *dynrel++ = ElfRel<E>(P, R_386_32, sym.get_dynsym_idx(ctx));
-        *(ul32 *)loc = A;
-      }
-      continue;
-    case R_386_PLT32:
-      *(ul32 *)loc = S + A - P;
-      continue;
-    case R_386_GOT32:
-    case R_386_GOT32X:
-      *(ul32 *)loc = G + A;
-      continue;
-    case R_386_GOTOFF:
-      *(ul32 *)loc = S + A - GOT;
-      continue;
-    case R_386_GOTPC:
-      *(ul32 *)loc = GOT + A - P;
-      continue;
-    case R_386_TLS_GOTIE:
-      *(ul32 *)loc = sym.get_gottp_addr(ctx) + A - GOT;
-      continue;
-    case R_386_TLS_LE:
-      *(ul32 *)loc = S + A - ctx.tls_end;
-      continue;
-    case R_386_TLS_IE:
-      *(ul32 *)loc = sym.get_gottp_addr(ctx) + A;
-      continue;
-    case R_386_TLS_GD:
-      if (sym.get_tlsgd_idx(ctx) == -1) {
-        // Relax GD to LE
-        switch (rels[i + 1].r_type) {
-        case R_386_PLT32: {
-          static const u8 insn[] = {
-            0x65, 0xa1, 0, 0, 0, 0, // mov %gs:0, %rax
-            0x81, 0xe8, 0, 0, 0, 0, // add $0, %rax
-          };
-          memcpy(loc - 3, insn, sizeof(insn));
-          *(ul32 *)(loc + 5) = ctx.tls_end - S - A;
-          break;
-        }
-        case R_386_GOT32: {
-          static const u8 insn[] = {
-            0x65, 0xa1, 0, 0, 0, 0, // mov %gs:0, %rax
-            0x81, 0xe8, 0, 0, 0, 0, // add $0, %rax
-          };
-          memcpy(loc - 2, insn, sizeof(insn));
-          *(ul32 *)(loc + 6) = ctx.tls_end - S - A;
-          break;
-        }
-        default:
-          unreachable();
-        }
-
-        i++;
-      } else {
-        *(ul32 *)loc = sym.get_tlsgd_addr(ctx) + A - GOT;
-      }
-      continue;
-    case R_386_TLS_LDM:
-      if (ctx.got->tlsld_idx == -1) {
-        // Relax LD to LE
-        switch (rels[i + 1].r_type) {
-        case R_386_PLT32: {
-          static const u8 insn[] = {
-            0x65, 0xa1, 0, 0, 0, 0, // mov %gs:0, %eax
-            0x8d, 0x74, 0x26, 0x00, // lea (%esi,1), %esi
-            0x90,                   // nop
-          };
-          memcpy(loc - 2, insn, sizeof(insn));
-          break;
-        }
-        case R_386_GOT32: {
-          static const u8 insn[] = {
-            0x65, 0xa1, 0, 0, 0, 0, // mov %gs:0, %eax
-            0x8d, 0x74, 0x26, 0x00, // lea (%esi,1), %esi
-            0x66, 0x90,
-          };
-          memcpy(loc - 2, insn, sizeof(insn));
-          break;
-        }
-        default:
-          unreachable();
-        }
-
-        i++;
-      } else {
-        *(ul32 *)loc = ctx.got->get_tlsld_addr(ctx) + A - GOT;
-      }
-      continue;
-    case R_386_TLS_LDO_32:
-      if (ctx.got->tlsld_idx == -1)
-        *(ul32 *)loc = S + A - ctx.tls_end;
-      else
-        *(ul32 *)loc = S + A - ctx.tls_begin;
-      continue;
-    case R_386_SIZE32:
-      *(ul32 *)loc = sym.esym().st_size + A;
-      continue;
-    case R_386_TLS_GOTDESC:
-      if (sym.get_tlsdesc_idx(ctx) == -1) {
-        static const u8 insn[] = {
-          0x8d, 0x05, 0, 0, 0, 0, // lea 0, %eax
-        };
-        memcpy(loc - 2, insn, sizeof(insn));
-        *(ul32 *)loc = S + A - ctx.tls_end;
-      } else {
-        *(ul32 *)loc = sym.get_tlsdesc_addr(ctx) + A - GOT;
-      }
-      continue;
-    case R_386_TLS_DESC_CALL:
-      if (ctx.arg.relax && !ctx.arg.shared) {
-        // call *(%rax) -> nop
-        loc[0] = 0x66;
-        loc[1] = 0x90;
-      }
-      continue;
-    default:
-      unreachable();
-    }
-
-#undef S
-#undef A
-#undef P
-#undef G
-#undef GOT
-  }
-}
-
-template <>
-void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_386_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = base + rel.r_offset;
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    SectionFragment<E> *frag;
-    i64 addend;
-    std::tie(frag, addend) = get_fragment(ctx, rel);
-
-    auto overflow_check = [&](i64 val, i64 lo, i64 hi) {
-      if (val < lo || hi <= val)
-        Error(ctx) << *this << ": relocation " << rel << " against "
-                   << sym << " out of range: " << val << " is not in ["
-                   << lo << ", " << hi << ")";
-    };
-
-#define S   (frag ? frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A   (frag ? addend : this->get_addend(rel))
-#define G   (sym.get_got_addr(ctx) - ctx.got->shdr.sh_addr)
-#define GOT ctx.got->shdr.sh_addr
-
-    switch (rel.r_type) {
-    case R_386_8: {
-      i64 val = S + A;
-      overflow_check(val, 0, 1 << 8);
-      *loc = val;
-      continue;
-    }
-    case R_386_16: {
-      i64 val = S + A;
-      overflow_check(val, 0, 1 << 16);
-      *(ul16 *)loc = val;
-      continue;
-    }
-    case R_386_32:
-      if (!frag) {
-        if (std::optional<u64> val = get_tombstone(sym)) {
-          *(ul32 *)loc = *val;
-          continue;
-        }
-      }
-      *(ul32 *)loc = S + A;
-      continue;
-    case R_386_PC8: {
-      i64 val = S + A;
-      overflow_check(val, -(1 << 7), 1 << 7);
-      *loc = val;
-      continue;
-    }
-    case R_386_PC16: {
-      i64 val = S + A;
-      overflow_check(val, -(1 << 15), 1 << 15);
-      *(ul16 *)loc = val;
-      continue;
-    };
-    case R_386_PC32:
-      *(ul32 *)loc = S + A;
-      continue;
-    case R_386_GOTPC:
-      *(ul32 *)loc = GOT + A;
-      continue;
-    case R_386_GOTOFF:
-      *(ul32 *)loc = S + A - GOT;
-      continue;
-    case R_386_TLS_LDO_32:
-      if (std::optional<u64> val = get_tombstone(sym))
-        *(ul32 *)loc = *val;
-      else
-        *(ul32 *)loc = S + A - ctx.tls_begin;
-      continue;
-    case R_386_SIZE32:
-      *(ul32 *)loc = sym.esym().st_size + A;
-      continue;
-    default:
-      unreachable();
-    }
-
-#undef S
-#undef A
-#undef GOT
-  }
-}
-
-template <>
-void InputSection<E>::scan_relocations(Context<E> &ctx) {
-  assert(shdr().sh_flags & SHF_ALLOC);
-
-  this->reldyn_offset = file.num_dynrel * sizeof(ElfRel<E>);
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  // Scan relocations
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_386_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    if (sym.get_type() == STT_GNU_IFUNC) {
-      sym.flags |= NEEDS_GOT;
-      sym.flags |= NEEDS_PLT;
-    }
-
-    switch (rel.r_type) {
-    case R_386_8:
-    case R_386_16: {
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  NONE,     ERROR, ERROR,         ERROR },      // DSO
-        {  NONE,     ERROR, ERROR,         ERROR },      // PIE
-        {  NONE,     NONE,  COPYREL,       CPLT  },      // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_386_32: {
-      Action table[][4] = {
-        // Absolute  Local    Imported data  Imported code
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // DSO
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // PIE
-        {  NONE,     NONE,    COPYREL,       CPLT   },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_386_PC8:
-    case R_386_PC16: {
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  ERROR,    NONE,  ERROR,         ERROR },      // DSO
-        {  ERROR,    NONE,  COPYREL,       PLT   },      // PIE
-        {  NONE,     NONE,  COPYREL,       PLT   },      // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_386_PC32: {
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  ERROR,    NONE,  DYNREL,        DYNREL },     // DSO
-        {  ERROR,    NONE,  COPYREL,       PLT    },     // PIE
-        {  NONE,     NONE,  COPYREL,       PLT    },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_386_GOT32:
-    case R_386_GOT32X:
-    case R_386_GOTPC:
-      sym.flags |= NEEDS_GOT;
-      break;
-    case R_386_PLT32: {
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  NONE,     NONE,  PLT,           PLT    },     // DSO
-        {  NONE,     NONE,  PLT,           PLT    },     // PIE
-        {  NONE,     NONE,  PLT,           PLT    },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_386_TLS_GOTIE:
-    case R_386_TLS_LE:
-    case R_386_TLS_IE:
-      sym.flags |= NEEDS_GOTTP;
-      break;
-    case R_386_TLS_GD:
-      if (i + 1 == rels.size())
-        Fatal(ctx) << *this << ": TLS_GD reloc must be followed by PLT or GOT32";
-
-      if (u32 ty = rels[i + 1].r_type;
-          ty != R_386_PLT32 && ty != R_386_GOT32)
-        Fatal(ctx) << *this << ": TLS_GD reloc must be followed by PLT or GOT32";
-
-      if (ctx.arg.relax && !ctx.arg.shared && !sym.is_imported)
-        i++;
-      else
-        sym.flags |= NEEDS_TLSGD;
-      break;
-    case R_386_TLS_LDM:
-      if (i + 1 == rels.size())
-        Fatal(ctx) << *this << ": TLS_LDM reloc must be followed by PLT or GOT32";
-
-      if (u32 ty = rels[i + 1].r_type;
-          ty != R_386_PLT32 && ty != R_386_GOT32)
-        Fatal(ctx) << *this << ": TLS_LDM reloc must be followed by PLT or GOT32";
-
-      if (ctx.arg.relax && !ctx.arg.shared)
-        i++;
-      else
-        ctx.needs_tlsld = true;
-      break;
-    case R_386_TLS_GOTDESC:
-      if (!ctx.arg.relax || ctx.arg.shared)
-        sym.flags |= NEEDS_TLSDESC;
-      break;
-    case R_386_GOTOFF:
-    case R_386_TLS_LDO_32:
-    case R_386_SIZE32:
-    case R_386_TLS_DESC_CALL:
-      break;
-    default:
-      Error(ctx) << *this << ": unknown relocation: " << rel;
-    }
-  }
-}
-
-} // namespace mold::elf

elf/arch-riscv.cc

@@ -1,833 +0,0 @@
-#include "mold.h"
-
-#include <tbb/parallel_for.h>
-#include <tbb/parallel_for_each.h>
-
-namespace mold::elf {
-
-static u32 itype(u32 val) {
-  return val << 20;
-}
-
-static u32 stype(u32 val) {
-  return bits(val, 11, 5) << 25 | bits(val, 4, 0) << 7;
-}
-
-static u32 btype(u32 val) {
-  return bit(val, 12) << 31 | bits(val, 10, 5) << 25 |
-         bits(val, 4, 1) << 8 | bit(val, 11) << 7;
-}
-
-static u32 utype(u32 val) {
-  // U-type instructions are used in combination with I-type
-  // instructions. U-type insn sets an immediate to the upper 20-bits
-  // of a register. I-type insn sign-extends a 12-bits immediate and
-  // add it to a register value to construct a complete value. 0x800
-  // is added here to compensate for the sign-extension.
-  return bits(val + 0x800, 31, 12) << 12;
-}
-
-static u32 jtype(u32 val) {
-  return bit(val, 20) << 31 | bits(val, 10, 1)  << 21 |
-         bit(val, 11) << 20 | bits(val, 19, 12) << 12;
-}
-
-static u32 cbtype(u32 val) {
-  return bit(val, 8) << 12 | bit(val, 4) << 11 | bit(val, 3) << 10 |
-         bit(val, 7) << 6  | bit(val, 6) << 5  | bit(val, 2) << 4  |
-         bit(val, 1) << 3  | bit(val, 5) << 2;
-}
-
-static u32 cjtype(u32 val) {
-  return bit(val, 11) << 12 | bit(val, 4)  << 11 | bit(val, 9) << 10 |
-         bit(val, 8)  << 9  | bit(val, 10) << 8  | bit(val, 6) << 7  |
-         bit(val, 7)  << 6  | bit(val, 3)  << 5  | bit(val, 2) << 4  |
-         bit(val, 1)  << 3  | bit(val, 5)  << 2;
-}
-
-static void write_itype(u8 *loc, u32 val) {
-  u32 mask = 0b000000'00000'11111'111'11111'1111111;
-  *(ul32 *)loc = (*(ul32 *)loc & mask) | itype(val);
-}
-
-static void write_stype(u8 *loc, u32 val) {
-  u32 mask = 0b000000'11111'11111'111'00000'1111111;
-  *(ul32 *)loc = (*(ul32 *)loc & mask) | stype(val);
-}
-
-static void write_btype(u8 *loc, u32 val) {
-  u32 mask = 0b000000'11111'11111'111'00000'1111111;
-  *(ul32 *)loc = (*(ul32 *)loc & mask) | btype(val);
-}
-
-static void write_utype(u8 *loc, u32 val) {
-  u32 mask = 0b000000'00000'00000'000'11111'1111111;
-  *(ul32 *)loc = (*(ul32 *)loc & mask) | utype(val);
-}
-
-static void write_jtype(u8 *loc, u32 val) {
-  u32 mask = 0b000000'00000'00000'000'11111'1111111;
-  *(ul32 *)loc = (*(ul32 *)loc & mask) | jtype(val);
-}
-
-static void write_cbtype(u8 *loc, u32 val) {
-  u32 mask = 0b1110001110000011;
-  *(ul16 *)loc = (*(ul16 *)loc & mask) | cbtype(val);
-}
-
-static void write_cjtype(u8 *loc, u32 val) {
-  u32 mask = 0b1110000000000011;
-  *(ul16 *)loc = (*(ul16 *)loc & mask) | cjtype(val);
-}
-
-template <typename E>
-static void write_plt_header(Context<E> &ctx) {
-  u8 *buf = ctx.buf + ctx.plt->shdr.sh_offset;
-
-  static const u32 plt0_64[] = {
-    0x00000397, // auipc  t2, %pcrel_hi(.got.plt)
-    0x41c30333, // sub    t1, t1, t3               # .plt entry + hdr + 12
-    0x0003be03, // ld     t3, %pcrel_lo(1b)(t2)    # _dl_runtime_resolve
-    0xfd430313, // addi   t1, t1, -44              # .plt entry
-    0x00038293, // addi   t0, t2, %pcrel_lo(1b)    # &.got.plt
-    0x00135313, // srli   t1, t1, 1                # .plt entry offset
-    0x0082b283, // ld     t0, 8(t0)                # link map
-    0x000e0067, // jr     t3
-  };
-
-  static const u32 plt0_32[] = {
-    0x00000397, // auipc  t2, %pcrel_hi(.got.plt)
-    0x41c30333, // sub    t1, t1, t3               # .plt entry + hdr + 12
-    0x0003ae03, // lw     t3, %pcrel_lo(1b)(t2)    # _dl_runtime_resolve
-    0xfd430313, // addi   t1, t1, -44              # .plt entry
-    0x00038293, // addi   t0, t2, %pcrel_lo(1b)    # &.got.plt
-    0x00135313, // srli   t1, t1, 1                # .plt entry offset
-    0x0082a283, // lw     t0, 8(t0)                # link map
-    0x000e0067, // jr     t3
-  };
-
-  if constexpr (E::word_size == 8)
-    memcpy(buf, plt0_64, sizeof(plt0_64));
-  else
-    memcpy(buf, plt0_32, sizeof(plt0_32));
-
-  u64 gotplt = ctx.gotplt->shdr.sh_addr;
-  u64 plt = ctx.plt->shdr.sh_addr;
-
-  write_utype(buf, gotplt - plt);
-  write_itype(buf + 8, gotplt - plt);
-  write_itype(buf + 16, gotplt - plt);
-}
-
-static constexpr u32 plt_entry_64[] = {
-  0x00000e17, // auipc   t3, %pcrel_hi([email protected])
-  0x000e3e03, // ld      t3, %pcrel_lo(1b)(t3)
-  0x000e0367, // jalr    t1, t3
-  0x00000013, // nop
-};
-
-static constexpr u32 plt_entry_32[] = {
-  0x00000e17, // auipc   t3, %pcrel_hi([email protected])
-  0x000e2e03, // lw      t3, %pcrel_lo(1b)(t3)
-  0x000e0367, // jalr    t1, t3
-  0x00000013, // nop
-};
-
-template <typename E>
-void PltSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + ctx.plt->shdr.sh_offset;
-
-  write_plt_header(ctx);
-
-  for (Symbol<E> *sym : symbols) {
-    u8 *ent = buf + E::plt_hdr_size + sym->get_plt_idx(ctx) * E::plt_size;
-    u64 gotplt = sym->get_gotplt_addr(ctx);
-    u64 plt = sym->get_plt_addr(ctx);
-
-    if constexpr (E::word_size == 8)
-      memcpy(ent, plt_entry_64, sizeof(plt_entry_64));
-    else
-      memcpy(ent, plt_entry_32, sizeof(plt_entry_32));
-
-    write_utype(ent, gotplt - plt);
-    write_itype(ent + 4, gotplt - plt);
-  }
-}
-
-template <typename E>
-void PltGotSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-
-  for (Symbol<E> *sym : symbols) {
-    u8 *ent = buf + sym->get_pltgot_idx(ctx) * E::pltgot_size;
-    u64 got = sym->get_got_addr(ctx);
-    u64 plt = sym->get_plt_addr(ctx);
-
-    if constexpr (E::word_size == 8)
-      memcpy(ent, plt_entry_64, sizeof(plt_entry_64));
-    else
-      memcpy(ent, plt_entry_32, sizeof(plt_entry_32));
-
-    write_utype(ent, got - plt);
-    write_itype(ent + 4, got - plt);
-  }
-}
-
-template <typename E>
-void EhFrameSection<E>::apply_reloc(Context<E> &ctx, const ElfRel<E> &rel,
-                                    u64 offset, u64 val) {
-  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
-
-  switch (rel.r_type) {
-  case R_RISCV_ADD32:
-    *(ul32 *)loc += val;
-    return;
-  case R_RISCV_SUB8:
-    *loc -= val;
-    return;
-  case R_RISCV_SUB16:
-    *(ul16 *)loc -= val;
-    return;
-  case R_RISCV_SUB32:
-    *(ul32 *)loc -= val;
-    return;
-  case R_RISCV_SUB6:
-    *loc = (*loc & 0b1100'0000) | ((*loc - val) & 0b0011'1111);
-    return;
-  case R_RISCV_SET6:
-    *loc = (*loc & 0b1100'0000) | (val & 0b0011'1111);
-    return;
-  case R_RISCV_SET8:
-    *loc = val;
-    return;
-  case R_RISCV_SET16:
-    *(ul16 *)loc = val;
-    return;
-  case R_RISCV_SET32:
-    *(ul32 *)loc = val;
-    return;
-  case R_RISCV_32_PCREL:
-    *(ul32 *)loc = val - this->shdr.sh_addr - offset;
-    return;
-  }
-  Fatal(ctx) << "unsupported relocation in .eh_frame: " << rel;
-}
-
-template <typename E>
-void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
-  ElfRel<E> *dynrel = nullptr;
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  i64 frag_idx = 0;
-
-  if (ctx.reldyn)
-    dynrel = (ElfRel<E> *)(ctx.buf + ctx.reldyn->shdr.sh_offset +
-                           file.reldyn_offset + this->reldyn_offset);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_RISCV_NONE || rel.r_type == R_RISCV_RELAX)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    i64 r_offset = rel.r_offset + extra.r_deltas[i];
-    u8 *loc = base + r_offset;
-
-    const SectionFragmentRef<E> *frag_ref = nullptr;
-    if (rel_fragments && rel_fragments[frag_idx].idx == i)
-      frag_ref = &rel_fragments[frag_idx++];
-
-#define S   (frag_ref ? frag_ref->frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A   (frag_ref ? (u64)frag_ref->addend : (u64)rel.r_addend)
-#define P   (output_section->shdr.sh_addr + offset + r_offset)
-#define G   (sym.get_got_addr(ctx) - ctx.got->shdr.sh_addr)
-#define GOT ctx.got->shdr.sh_addr
-
-    switch (rel.r_type) {
-    case R_RISCV_32:
-      *(ul32 *)loc = S + A;
-      break;
-    case R_RISCV_64:
-      if (sym.is_absolute() || !ctx.arg.pic) {
-        *(ul64 *)loc = S + A;
-      } else if (sym.is_imported) {
-        *dynrel++ = ElfRel<E>(P, R_RISCV_64, sym.get_dynsym_idx(ctx), A);
-        *(ul64 *)loc = A;
-      } else {
-        if (!is_relr_reloc(ctx, rel))
-          *dynrel++ = ElfRel<E>(P, R_RISCV_RELATIVE, 0, S + A);
-        *(ul64 *)loc = S + A;
-      }
-      break;
-    case R_RISCV_BRANCH:
-      write_btype(loc, S + A - P);
-      break;
-    case R_RISCV_JAL:
-      write_jtype(loc, S + A - P);
-      break;
-    case R_RISCV_CALL:
-    case R_RISCV_CALL_PLT: {
-      if (extra.r_deltas[i + 1] - extra.r_deltas[i] != 0) {
-        // auipc + jalr -> jal
-        assert(extra.r_deltas[i + 1] - extra.r_deltas[i] == -4);
-        u32 jalr = *(ul32 *)&contents[rels[i].r_offset + 4];
-        *(ul32 *)loc = (0b11111'000000 & jalr) | 0b101111;
-        write_jtype(loc, S + A - P);
-      } else {
-        u64 val = sym.esym().is_undef_weak() ? 0 : S + A - P;
-        write_utype(loc, val);
-        write_itype(loc + 4, val);
-      }
-      break;
-    }
-    case R_RISCV_GOT_HI20:
-      *(ul32 *)loc = G + GOT + A - P;
-      break;
-    case R_RISCV_TLS_GOT_HI20:
-      *(ul32 *)loc = sym.get_gottp_addr(ctx) + A - P;
-      break;
-    case R_RISCV_TLS_GD_HI20:
-      *(ul32 *)loc = sym.get_tlsgd_addr(ctx) + A - P;
-      break;
-    case R_RISCV_PCREL_HI20:
-      if (sym.esym().is_undef_weak()) {
-        // Calling an undefined weak symbol does not make sense.
-        // We make such call into an infinite loop. This should
-        // help debugging of a faulty program.
-        *(ul32 *)loc = 0;
-      } else {
-        *(ul32 *)loc = S + A - P;
-      }
-      break;
-    case R_RISCV_LO12_I:
-    case R_RISCV_TPREL_LO12_I:
-      write_itype(loc, S + A);
-      break;
-    case R_RISCV_LO12_S:
-    case R_RISCV_TPREL_LO12_S:
-      write_stype(loc, S + A);
-      break;
-    case R_RISCV_HI20:
-      write_utype(loc, S + A);
-      break;
-    case R_RISCV_TPREL_HI20:
-      write_utype(loc, S + A - ctx.tls_begin);
-      break;
-    case R_RISCV_TPREL_ADD:
-      break;
-    case R_RISCV_ADD8:
-      loc += S + A;
-      break;
-    case R_RISCV_ADD16:
-      *(ul16 *)loc += S + A;
-      break;
-    case R_RISCV_ADD32:
-      *(ul32 *)loc += S + A;
-      break;
-    case R_RISCV_ADD64:
-      *(ul64 *)loc += S + A;
-      break;
-    case R_RISCV_SUB8:
-      loc -= S + A;
-      break;
-    case R_RISCV_SUB16:
-      *(ul16 *)loc -= S + A;
-      break;
-    case R_RISCV_SUB32:
-      *(ul32 *)loc -= S + A;
-      break;
-    case R_RISCV_SUB64:
-      *(ul64 *)loc -= S + A;
-      break;
-    case R_RISCV_ALIGN:
-      // A R_RISCV_ALIGN is followed by nops. We sometimes have to not
-      // just remove nops but rewrite a nop with a c.nop. Here, we always
-      // rewrite all nops for the sake of simplicity.
-      if (i64 padding_size = align_to(P, bit_ceil(rel.r_addend)) - P) {
-        assert(padding_size % 2 == 0);
-        i64 i = 0;
-        for (; i <= padding_size - 4; i += 4)
-          *(ul32 *)(loc + i) = 0x00000013; // nop
-        if (i != padding_size)
-          *(ul16 *)(loc + i) = 0x0001;     // c.nop
-      }
-      break;
-    case R_RISCV_RVC_BRANCH:
-      write_cbtype(loc, S + A - P);
-      break;
-    case R_RISCV_RVC_JUMP:
-      write_cjtype(loc, S + A - P);
-      break;
-    case R_RISCV_SUB6:
-      *loc = (*loc & 0b1100'0000) | ((*loc - (S + A)) & 0b0011'1111);
-      break;
-    case R_RISCV_SET6:
-      *loc = (*loc & 0b1100'0000) | ((S + A) & 0b0011'1111);
-      break;
-    case R_RISCV_SET8:
-      *loc = S + A;
-      break;
-    case R_RISCV_SET16:
-      *(ul16 *)loc = S + A;
-      break;
-    case R_RISCV_SET32:
-      *(ul32 *)loc = S + A;
-      break;
-    case R_RISCV_32_PCREL:
-      *(ul32 *)loc = S + A - P;
-      break;
-    case R_RISCV_PCREL_LO12_I:
-    case R_RISCV_PCREL_LO12_S:
-      // These relocations are handled in the next loop.
-      break;
-    default:
-      unreachable();
-    }
-
-#undef S
-#undef A
-#undef P
-#undef G
-#undef GOT
-  }
-
-  // Handle LO12 relocations. In the above loop, PC-relative HI20
-  // relocations overwrote instructions with full 32-bit values to allow
-  // their corresponding LO12 relocations to read their values.
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &r = rels[i];
-    if (r.r_type != R_RISCV_PCREL_LO12_I && r.r_type != R_RISCV_PCREL_LO12_S)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[r.r_sym];
-    assert(sym.get_input_section() == this);
-
-    u8 *loc = base + r.r_offset + extra.r_deltas[i];
-    u32 val = *(ul32 *)(base + sym.value);
-
-    if (r.r_type == R_RISCV_PCREL_LO12_I)
-      write_itype(loc, val);
-    else
-      write_stype(loc, val);
-  }
-
-  // Restore the original instructions HI20 relocations overwrote.
-  for (i64 i = 0; i < rels.size(); i++) {
-    switch (rels[i].r_type) {
-    case R_RISCV_GOT_HI20:
-    case R_RISCV_PCREL_HI20:
-    case R_RISCV_TLS_GOT_HI20:
-    case R_RISCV_TLS_GD_HI20: {
-      u8 *loc = base + rels[i].r_offset + extra.r_deltas[i];
-      u32 val = *(ul32 *)loc;
-      *(ul32 *)loc = *(ul32 *)&contents[rels[i].r_offset];
-      write_utype(loc, val);
-    }
-    }
-  }
-}
-
-template <typename E>
-void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_RISCV_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = base + rel.r_offset;
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    SectionFragment<E> *frag;
-    i64 addend;
-    std::tie(frag, addend) = get_fragment(ctx, rel);
-
-#define S (frag ? frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A (frag ? (u64)addend : (u64)rel.r_addend)
-
-    switch (rel.r_type) {
-    case R_RISCV_32:
-      *(ul32 *)loc = S + A;
-      break;
-    case R_RISCV_64:
-      if (!frag) {
-        if (std::optional<u64> val = get_tombstone(sym)) {
-          *(ul64 *)loc = *val;
-          break;
-        }
-      }
-      *(ul64 *)loc = S + A;
-      break;
-    case R_RISCV_ADD8:
-      *loc += S + A;
-      break;
-    case R_RISCV_ADD16:
-      *(ul16 *)loc += S + A;
-      break;
-    case R_RISCV_ADD32:
-      *(ul32 *)loc += S + A;
-      break;
-    case R_RISCV_ADD64:
-      *(ul64 *)loc += S + A;
-      break;
-    case R_RISCV_SUB8:
-      *loc -= S + A;
-      break;
-    case R_RISCV_SUB16:
-      *(ul16 *)loc -= S + A;
-      break;
-    case R_RISCV_SUB32:
-      *(ul32 *)loc -= S + A;
-      break;
-    case R_RISCV_SUB64:
-      *(ul64 *)loc -= S + A;
-      break;
-    case R_RISCV_SUB6:
-      *loc = (*loc & 0b1100'0000) | ((*loc - (S + A)) & 0b0011'1111);
-      break;
-    case R_RISCV_SET6:
-      *loc = (*loc & 0b1100'0000) | ((S + A) & 0b0011'1111);
-      break;
-    case R_RISCV_SET8:
-      *loc = S + A;
-      break;
-    case R_RISCV_SET16:
-      *(ul16 *)loc = S + A;
-      break;
-    case R_RISCV_SET32:
-      *(ul32 *)loc = S + A;
-      break;
-    default:
-      Fatal(ctx) << *this << ": invalid relocation for non-allocated sections: "
-                 << rel;
-      break;
-    }
-
-#undef S
-#undef A
-  }
-}
-
-template <typename E>
-void InputSection<E>::copy_contents_riscv(Context<E> &ctx, u8 *buf) {
-  // A non-alloc section isn't relaxed, so just copy it as one big chunk.
-  if (!(shdr().sh_flags & SHF_ALLOC)) {
-    if (compressed)
-      uncompress_to(ctx, buf);
-    else
-      memcpy(buf, contents.data(), contents.size());
-    return;
-  }
-
-  // Memory-allocated sections may be relaxed, so copy each segment
-  // individually.
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-  i64 pos = 0;
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    i64 delta = extra.r_deltas[i + 1] - extra.r_deltas[i];
-    if (delta == 0)
-      continue;
-    assert(delta < 0);
-
-    const ElfRel<E> &r = rels[i];
-    memcpy(buf, contents.data() + pos, r.r_offset - pos);
-    buf += r.r_offset - pos;
-    pos = r.r_offset - delta;
-  }
-
-  memcpy(buf, contents.data() + pos, contents.size() - pos);
-}
-
-template <typename E>
-void InputSection<E>::scan_relocations(Context<E> &ctx) {
-  assert(shdr().sh_flags & SHF_ALLOC);
-
-  this->reldyn_offset = file.num_dynrel * sizeof(ElfRel<E>);
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  // Scan relocations
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_RISCV_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    if (sym.get_type() == STT_GNU_IFUNC) {
-      sym.flags |= NEEDS_GOT;
-      sym.flags |= NEEDS_PLT;
-    }
-
-    switch (rel.r_type) {
-    case R_RISCV_32:
-    case R_RISCV_HI20: {
-      Action table[][4] = {
-        // Absolute  Local    Imported data  Imported code
-        {  NONE,     ERROR,   ERROR,         ERROR },      // DSO
-        {  NONE,     ERROR,   ERROR,         ERROR },      // PIE
-        {  NONE,     NONE,    COPYREL,       CPLT  },      // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_RISCV_64: {
-      Action table[][4] = {
-        // Absolute  Local    Imported data  Imported code
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // DSO
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // PIE
-        {  NONE,     NONE,    COPYREL,       CPLT   },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_RISCV_CALL:
-    case R_RISCV_CALL_PLT:
-      if (sym.is_imported)
-        sym.flags |= NEEDS_PLT;
-      break;
-    case R_RISCV_GOT_HI20:
-      sym.flags |= NEEDS_GOT;
-      break;
-    case R_RISCV_TLS_GOT_HI20:
-      ctx.has_gottp_rel = true;
-      sym.flags |= NEEDS_GOTTP;
-      break;
-    case R_RISCV_TLS_GD_HI20:
-      sym.flags |= NEEDS_TLSGD;
-      break;
-    case R_RISCV_32_PCREL: {
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  ERROR,    NONE,  ERROR,         ERROR },      // DSO
-        {  ERROR,    NONE,  COPYREL,       PLT   },      // PIE
-        {  NONE,     NONE,  COPYREL,       PLT   },      // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_RISCV_BRANCH:
-    case R_RISCV_JAL:
-    case R_RISCV_PCREL_HI20:
-    case R_RISCV_PCREL_LO12_I:
-    case R_RISCV_PCREL_LO12_S:
-    case R_RISCV_LO12_I:
-    case R_RISCV_LO12_S:
-    case R_RISCV_TPREL_HI20:
-    case R_RISCV_TPREL_LO12_I:
-    case R_RISCV_TPREL_LO12_S:
-    case R_RISCV_TPREL_ADD:
-    case R_RISCV_ADD8:
-    case R_RISCV_ADD16:
-    case R_RISCV_ADD32:
-    case R_RISCV_ADD64:
-    case R_RISCV_SUB8:
-    case R_RISCV_SUB16:
-    case R_RISCV_SUB32:
-    case R_RISCV_SUB64:
-    case R_RISCV_ALIGN:
-    case R_RISCV_RVC_BRANCH:
-    case R_RISCV_RVC_JUMP:
-    case R_RISCV_RELAX:
-    case R_RISCV_SUB6:
-    case R_RISCV_SET6:
-    case R_RISCV_SET8:
-    case R_RISCV_SET16:
-    case R_RISCV_SET32:
-      break;
-    default:
-      Error(ctx) << *this << ": unknown relocation: " << rel;
-    }
-  }
-}
-
-template <typename E>
-static bool is_resizable(Context<E> &ctx, InputSection<E> *isec) {
-  return isec && (isec->shdr().sh_flags & SHF_ALLOC);
-}
-
-template <typename E>
-static std::vector<Symbol<E> *> get_sorted_symbols(InputSection<E> &isec) {
-  std::vector<Symbol<E> *> vec;
-  for (Symbol<E> *sym : isec.file.symbols)
-    if (sym->file == &isec.file && sym->get_input_section() == &isec)
-      vec.push_back(sym);
-  sort(vec, [](Symbol<E> *a, Symbol<E> *b) { return a->value < b->value; });
-  return vec;
-}
-
-// Returns the distance between a relocated place and a symbol.
-template <typename E>
-static i64 compute_distance(Context<E> &ctx, Symbol<E> &sym,
-                            InputSection<E> &isec, const ElfRel<E> &rel) {
-  // We handle absolute symbols as if they were infinitely far away
-  // because `relax_section` may increase a distance between a branch
-  // instruction and an absolute symbol. Branching to an absolute
-  // location is extremely rare in real code, though.
-  if (sym.is_absolute())
-    return INT32_MAX;
-
-  // Likewise, relocations against weak undefined symbols won't be relaxed.
-  if (sym.esym().is_undef_weak())
-    return INT32_MAX;
-
-  // Compute a distance between the relocated place and the symbol.
-  i64 S = sym.get_addr(ctx);
-  i64 A = rel.r_addend;
-  i64 P = isec.get_addr() + rel.r_offset;
-  return S + A - P;
-}
-
-// Relax R_RISCV_CALL and R_RISCV_CALL_PLT relocations.
-template <typename E>
-static void relax_section(Context<E> &ctx, InputSection<E> &isec) {
-  std::vector<Symbol<E> *> vec = get_sorted_symbols(isec);
-  std::span<Symbol<E> *> syms = vec;
-  i64 delta = 0;
-
-  std::span<const ElfRel<E>> rels = isec.get_rels(ctx);
-  isec.extra.r_deltas.resize(rels.size() + 1);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &r = rels[i];
-    i64 delta2 = 0;
-
-    isec.extra.r_deltas[i] = delta;
-
-    switch (r.r_type) {
-    case R_RISCV_ALIGN: {
-      // R_RISCV_ALIGN refers NOP instructions. We need to eliminate
-      // some or all of the instructions so that the instruction that
-      // immediately follows the NOPs is aligned to a specified
-      // alignment boundary.
-      u64 loc = isec.get_addr() + r.r_offset + delta;
-
-      // The total bytes of NOPs is stored to r_addend, so the next
-      // instruction is r_addend away.
-      u64 next_loc = loc + r.r_addend;
-      u64 alignment = bit_ceil(r.r_addend + 1);
-      assert(alignment <= (1 << isec.p2align));
-
-      if (next_loc % alignment)
-        delta2 = align_to(loc, alignment) - next_loc;
-      break;
-    }
-    case R_RISCV_CALL:
-    case R_RISCV_CALL_PLT:
-      if (ctx.arg.relax) {
-        if (i == rels.size() - 1 || rels[i + 1].r_type != R_RISCV_RELAX)
-          break;
-
-        // If the jump target is within ±1 MiB, we can replace AUIPC+JALR
-        // with JAL, saving 4 bytes.
-        Symbol<E> &sym = *isec.file.symbols[r.r_sym];
-        i64 dist = compute_distance(ctx, sym, isec, r);
-        if (dist % 2 == 0 && -(1 << 20) <= dist && dist < (1 << 20))
-          delta2 = -4;
-      }
-    }
-
-    if (delta2 == 0)
-      continue;
-
-    while (!syms.empty() && syms[0]->value <= r.r_offset) {
-      syms[0]->value += delta;
-      syms = syms.subspan(1);
-    }
-
-    delta += delta2;
-  }
-
-  for (Symbol<E> *sym : syms)
-    sym->value += delta;
-  isec.extra.r_deltas[rels.size()] = delta;
-
-  isec.sh_size += delta;
-}
-
-// RISC-V instructions are 16 or 32 bits long, so immediates encoded
-// in instructions can't be 32 bits long. Therefore, branch and load
-// instructions can't refer the 4 GiB address space unlike x86-64.
-// In fact, JAL (jump and link) instruction can jump to only within
-// ±1 MiB as their immediate is only 21 bits long.
-//
-// If you want to jump to somewhere further than that, you need to
-// construct a full 32-bit offset using multiple instruction and
-// branch to that place (e.g. AUIPC and JALR instead of JAL).
-// In this comment, we refer instructions such as JAL as the short
-// encoding and ones such as AUIPC+JALR as the long encoding.
-//
-// By default, compiler always uses the long encoding so that branch
-// targets are always encodable. This is a safe bet for them but
-// may result in inefficient code. Therefore, the RISC-V psABI defines
-// a mechanism for the linker to replace long encoding instructions
-// with short ones, shrinking the section and increasing the code
-// density.
-//
-// This is contrary to the psABIs for the other RISC processors such as
-// ARM64. Typically, they use short instructions by default, and a
-// linker creates so-called "thunks" to extend ranges of short jumps.
-// On RISC-V, instructions are in the long encoding by default, and
-// the linker shrinks them if it can.
-//
-// When we shrink a section, we need to adjust relocation offsets and
-// symbol values. For example, if we replace AUIPC+JALR with JAL
-// (which saves 4 bytes), all relocations pointing to anywhere after
-// that location need to be shifted by 4. In addition to that, any
-// symbol that refers anywhere after that locatioin need to be shifted
-// by 4 bytes as well.
-//
-// For relocations, we use `r_deltas` array to memorize how many bytes
-// have be adjusted. For symbols, we directly mutate their `value`
-// member.
-//
-// This operation seems to be optional, as by default instructions are
-// using the long encoding, but calling this function is actually
-// mandatory because of R_RISCV_ALIGN. R_RISCV_ALIGN relocation is a
-// directive to the linker to align the location referred to by the
-// relocation to a specified byte boundary. We at least have to
-// interpret them satisfy the constraints imposed by R_RISCV_ALIGN
-// relocations.
-template <typename E>
-i64 riscv_resize_sections(Context<E> &ctx) {
-  Timer t(ctx, "riscv_resize_sections");
-
-  // Find R_RISCV_CALL AND R_RISCV_CALL_PLT that can be relaxed.
-  // This step should only shrink sections.
-  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
-    for (std::unique_ptr<InputSection<E>> &isec : file->sections)
-      if (is_resizable(ctx, isec.get()))
-        relax_section(ctx, *isec);
-  });
-
-  // Re-compute section offset again to finalize them.
-  compute_section_sizes(ctx);
-  return set_osec_offsets(ctx);
-}
-
-#define INSTANTIATE_RISCV(E)                                                 \
-  template void PltSection<E>::copy_buf(Context<E> &);                       \
-  template void PltGotSection<E>::copy_buf(Context<E> &);                    \
-  template void                                                              \
-  EhFrameSection<E>::apply_reloc(Context<E> &, const ElfRel<E> &, u64, u64); \
-  template void InputSection<E>::apply_reloc_alloc(Context<E> &, u8 *);      \
-  template void InputSection<E>::apply_reloc_nonalloc(Context<E> &, u8 *);   \
-  template void InputSection<E>::copy_contents_riscv(Context<E> &, u8 *);    \
-  template void InputSection<E>::scan_relocations(Context<E> &);             \
-  template i64 riscv_resize_sections(Context<E> &);
-
-INSTANTIATE_RISCV(RISCV64);
-INSTANTIATE_RISCV(RISCV32);
-
-} // namespace mold::elf

elf/arch-x86-64.cc

@@ -1,770 +0,0 @@
-#include "mold.h"
-
-namespace mold::elf {
-
-using E = X86_64;
-
-// This is a security-enhanced version of the regular PLT. The PLT
-// header and each PLT entry starts with endbr64 for the Intel's
-// control-flow enforcement security mechanism.
-//
-// Note that our IBT-enabled PLT instruction sequence is different
-// from the one used in GNU ld. GNU's IBTPLT implementation uses two
-// separate sections (.plt and .plt.sec) in which one PLT entry takes
-// 32 bytes in total. Our IBTPLT consists of just .plt and each entry
-// is 16 bytes long.
-//
-// Our PLT entry clobbers %r11, but that's fine because the resolver
-// function (_dl_runtime_resolve) clobbers %r11 anyway.
-template <>
-void PltSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-  memset(buf, 0xcc, this->shdr.sh_size);
-
-  // Write PLT header
-  static const u8 plt0[] = {
-    0xf3, 0x0f, 0x1e, 0xfa, // endbr64
-    0x41, 0x53,             // push %r11
-    0xff, 0x35, 0, 0, 0, 0, // push GOTPLT+8(%rip)
-    0xff, 0x25, 0, 0, 0, 0, // jmp *GOTPLT+16(%rip)
-  };
-
-  memcpy(buf, plt0, sizeof(plt0));
-  *(ul32 *)(buf + 8) = ctx.gotplt->shdr.sh_addr - this->shdr.sh_addr - 4;
-  *(ul32 *)(buf + 14) = ctx.gotplt->shdr.sh_addr - this->shdr.sh_addr - 2;
-
-  // Write PLT entries
-  static const u8 data[] = {
-    0xf3, 0x0f, 0x1e, 0xfa, // endbr64
-    0x41, 0xbb, 0, 0, 0, 0, // mov $index_in_relplt, %r11d
-    0xff, 0x25, 0, 0, 0, 0, // jmp *foo@GOTPLT
-  };
-
-  for (Symbol<E> *sym : symbols) {
-    i64 idx = sym->get_plt_idx(ctx);
-    u8 *ent = buf + E::plt_hdr_size + idx * E::plt_size;
-    memcpy(ent, data, sizeof(data));
-    *(ul32 *)(ent + 6) = idx;
-    *(ul32 *)(ent + 12) = sym->get_gotplt_addr(ctx) - sym->get_plt_addr(ctx) - 16;
-  }
-}
-
-template <>
-void PltGotSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->shdr.sh_offset;
-  memset(buf, 0xcc, this->shdr.sh_size);
-
-  static const u8 data[] = {
-    0xf3, 0x0f, 0x1e, 0xfa, // endbr64
-    0xff, 0x25, 0, 0, 0, 0, // jmp *foo@GOT
-  };
-
-  for (Symbol<E> *sym : symbols) {
-    u8 *ent = buf + sym->get_pltgot_idx(ctx) * E::pltgot_size;
-    memcpy(ent, data, sizeof(data));
-    *(ul32 *)(ent + 6) = sym->get_got_addr(ctx) - sym->get_plt_addr(ctx) - 10;
-  }
-}
-
-template <>
-void EhFrameSection<E>::apply_reloc(Context<E> &ctx, const ElfRel<E> &rel,
-                                    u64 offset, u64 val) {
-  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
-
-  switch (rel.r_type) {
-  case R_X86_64_NONE:
-    return;
-  case R_X86_64_32:
-    *(ul32 *)loc = val;
-    return;
-  case R_X86_64_64:
-    *(ul64 *)loc = val;
-    return;
-  case R_X86_64_PC32:
-    *(ul32 *)loc = val - this->shdr.sh_addr - offset;
-    return;
-  case R_X86_64_PC64:
-    *(ul64 *)loc = val - this->shdr.sh_addr - offset;
-    return;
-  }
-  unreachable();
-}
-
-static u32 relax_gotpcrelx(u8 *loc) {
-  switch ((loc[0] << 8) | loc[1]) {
-  case 0xff15: return 0x90e8; // call *0(%rip) -> call 0
-  case 0xff25: return 0x90e9; // jmp  *0(%rip) -> jmp  0
-  }
-  return 0;
-}
-
-static u32 relax_rex_gotpcrelx(u8 *loc) {
-  switch ((loc[0] << 16) | (loc[1] << 8) | loc[2]) {
-  case 0x488b05: return 0x488d05; // mov 0(%rip), %rax -> lea 0(%rip), %rax
-  case 0x488b0d: return 0x488d0d; // mov 0(%rip), %rcx -> lea 0(%rip), %rcx
-  case 0x488b15: return 0x488d15; // mov 0(%rip), %rdx -> lea 0(%rip), %rdx
-  case 0x488b1d: return 0x488d1d; // mov 0(%rip), %rbx -> lea 0(%rip), %rbx
-  case 0x488b25: return 0x488d25; // mov 0(%rip), %rsp -> lea 0(%rip), %rsp
-  case 0x488b2d: return 0x488d2d; // mov 0(%rip), %rbp -> lea 0(%rip), %rbp
-  case 0x488b35: return 0x488d35; // mov 0(%rip), %rsi -> lea 0(%rip), %rsi
-  case 0x488b3d: return 0x488d3d; // mov 0(%rip), %rdi -> lea 0(%rip), %rdi
-  case 0x4c8b05: return 0x4c8d05; // mov 0(%rip), %r8  -> lea 0(%rip), %r8
-  case 0x4c8b0d: return 0x4c8d0d; // mov 0(%rip), %r9  -> lea 0(%rip), %r9
-  case 0x4c8b15: return 0x4c8d15; // mov 0(%rip), %r10 -> lea 0(%rip), %r10
-  case 0x4c8b1d: return 0x4c8d1d; // mov 0(%rip), %r11 -> lea 0(%rip), %r11
-  case 0x4c8b25: return 0x4c8d25; // mov 0(%rip), %r12 -> lea 0(%rip), %r12
-  case 0x4c8b2d: return 0x4c8d2d; // mov 0(%rip), %r13 -> lea 0(%rip), %r13
-  case 0x4c8b35: return 0x4c8d35; // mov 0(%rip), %r14 -> lea 0(%rip), %r14
-  case 0x4c8b3d: return 0x4c8d3d; // mov 0(%rip), %r15 -> lea 0(%rip), %r15
-  }
-  return 0;
-}
-
-static u32 relax_gottpoff(u8 *loc) {
-  switch ((loc[0] << 16) | (loc[1] << 8) | loc[2]) {
-  case 0x488b05: return 0x48c7c0; // mov 0(%rip), %rax -> mov $0, %rax
-  case 0x488b0d: return 0x48c7c1; // mov 0(%rip), %rcx -> mov $0, %rcx
-  case 0x488b15: return 0x48c7c2; // mov 0(%rip), %rdx -> mov $0, %rdx
-  case 0x488b1d: return 0x48c7c3; // mov 0(%rip), %rbx -> mov $0, %rbx
-  case 0x488b25: return 0x48c7c4; // mov 0(%rip), %rsp -> mov $0, %rsp
-  case 0x488b2d: return 0x48c7c5; // mov 0(%rip), %rbp -> mov $0, %rbp
-  case 0x488b35: return 0x48c7c6; // mov 0(%rip), %rsi -> mov $0, %rsi
-  case 0x488b3d: return 0x48c7c7; // mov 0(%rip), %rdi -> mov $0, %rdi
-  case 0x4c8b05: return 0x49c7c0; // mov 0(%rip), %r8  -> mov $0, %r8
-  case 0x4c8b0d: return 0x49c7c1; // mov 0(%rip), %r9  -> mov $0, %r9
-  case 0x4c8b15: return 0x49c7c2; // mov 0(%rip), %r10 -> mov $0, %r10
-  case 0x4c8b1d: return 0x49c7c3; // mov 0(%rip), %r11 -> mov $0, %r11
-  case 0x4c8b25: return 0x49c7c4; // mov 0(%rip), %r12 -> mov $0, %r12
-  case 0x4c8b2d: return 0x49c7c5; // mov 0(%rip), %r13 -> mov $0, %r13
-  case 0x4c8b35: return 0x49c7c6; // mov 0(%rip), %r14 -> mov $0, %r14
-  case 0x4c8b3d: return 0x49c7c7; // mov 0(%rip), %r15 -> mov $0, %r15
-  }
-  return 0;
-}
-
-static u32 relax_gotpc32_tlsdesc(u8 *loc) {
-  switch ((loc[0] << 16) | (loc[1] << 8) | loc[2]) {
-  case 0x488d05: return 0x48c7c0; // lea 0(%rip), %rax -> mov $0, %rax
-  case 0x488d0d: return 0x48c7c1; // lea 0(%rip), %rcx -> mov $0, %rcx
-  case 0x488d15: return 0x48c7c2; // lea 0(%rip), %rdx -> mov $0, %rdx
-  case 0x488d1d: return 0x48c7c3; // lea 0(%rip), %rbx -> mov $0, %rbx
-  case 0x488d25: return 0x48c7c4; // lea 0(%rip), %rsp -> mov $0, %rsp
-  case 0x488d2d: return 0x48c7c5; // lea 0(%rip), %rbp -> mov $0, %rbp
-  case 0x488d35: return 0x48c7c6; // lea 0(%rip), %rsi -> mov $0, %rsi
-  case 0x488d3d: return 0x48c7c7; // lea 0(%rip), %rdi -> mov $0, %rdi
-  case 0x4c8d05: return 0x49c7c0; // lea 0(%rip), %r8  -> mov $0, %r8
-  case 0x4c8d0d: return 0x49c7c1; // lea 0(%rip), %r9  -> mov $0, %r9
-  case 0x4c8d15: return 0x49c7c2; // lea 0(%rip), %r10 -> mov $0, %r10
-  case 0x4c8d1d: return 0x49c7c3; // lea 0(%rip), %r11 -> mov $0, %r11
-  case 0x4c8d25: return 0x49c7c4; // lea 0(%rip), %r12 -> mov $0, %r12
-  case 0x4c8d2d: return 0x49c7c5; // lea 0(%rip), %r13 -> mov $0, %r13
-  case 0x4c8d35: return 0x49c7c6; // lea 0(%rip), %r14 -> mov $0, %r14
-  case 0x4c8d3d: return 0x49c7c7; // lea 0(%rip), %r15 -> mov $0, %r15
-  }
-  return 0;
-}
-
-// Apply relocations to SHF_ALLOC sections (i.e. sections that are
-// mapped to memory at runtime) based on the result of
-// scan_relocations().
-template <>
-void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
-  ElfRel<E> *dynrel = nullptr;
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-  i64 frag_idx = 0;
-
-  if (ctx.reldyn)
-    dynrel = (ElfRel<E> *)(ctx.buf + ctx.reldyn->shdr.sh_offset +
-                                file.reldyn_offset + this->reldyn_offset);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_X86_64_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = base + rel.r_offset;
-
-    const SectionFragmentRef<E> *frag_ref = nullptr;
-    if (rel_fragments && rel_fragments[frag_idx].idx == i)
-      frag_ref = &rel_fragments[frag_idx++];
-
-    auto overflow_check = [&](i64 val, i64 lo, i64 hi) {
-      if (val < lo || hi <= val)
-        Error(ctx) << *this << ": relocation " << rel << " against "
-                   << sym << " out of range: " << val << " is not in ["
-                   << lo << ", " << hi << ")";
-    };
-
-    auto write8 = [&](u64 val) {
-      overflow_check(val, 0, 1 << 8);
-      *loc = val;
-    };
-
-    auto write8s = [&](u64 val) {
-      overflow_check(val, -(1 << 7), 1 << 7);
-      *loc = val;
-    };
-
-    auto write16 = [&](u64 val) {
-      overflow_check(val, 0, 1 << 16);
-      *(ul16 *)loc = val;
-    };
-
-    auto write16s = [&](u64 val) {
-      overflow_check(val, -(1 << 15), 1 << 15);
-      *(ul16 *)loc = val;
-    };
-
-    auto write32 = [&](u64 val) {
-      overflow_check(val, 0, (i64)1 << 32);
-      *(ul32 *)loc = val;
-    };
-
-    auto write32s = [&](u64 val) {
-      overflow_check(val, -((i64)1 << 31), (i64)1 << 31);
-      *(ul32 *)loc = val;
-    };
-
-    auto write64 = [&](u64 val) {
-      *(ul64 *)loc = val;
-    };
-
-#define S   (frag_ref ? frag_ref->frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A   (frag_ref ? (u64)frag_ref->addend : (u64)rel.r_addend)
-#define P   (output_section->shdr.sh_addr + offset + rel.r_offset)
-#define G   (sym.get_got_addr(ctx) - ctx.gotplt->shdr.sh_addr)
-#define GOT ctx.gotplt->shdr.sh_addr
-
-    switch (rel.r_type) {
-    case R_X86_64_8:
-      write8(S + A);
-      continue;
-    case R_X86_64_16:
-      write16(S + A);
-      continue;
-    case R_X86_64_32:
-      write32(S + A);
-      continue;
-    case R_X86_64_32S:
-      write32s(S + A);
-      continue;
-    case R_X86_64_64:
-      if (sym.is_absolute() || !ctx.arg.pic) {
-        write64(S + A);
-      } else if (sym.is_imported) {
-        *dynrel++ = ElfRel<E>(P, R_X86_64_64, sym.get_dynsym_idx(ctx), A);
-        write64(A);
-      } else {
-        if (!is_relr_reloc(ctx, rel))
-          *dynrel++ = ElfRel<E>(P, R_X86_64_RELATIVE, 0, S + A);
-        write64(S + A);
-      }
-      continue;
-    case R_X86_64_PC8:
-      write8s(S + A - P);
-      continue;
-    case R_X86_64_PC16:
-      write16s(S + A - P);
-      continue;
-    case R_X86_64_PC32:
-      write32s(S + A - P);
-      continue;
-    case R_X86_64_PC64:
-      if (sym.is_absolute() || !sym.is_imported || !ctx.arg.shared) {
-        write64(S + A - P);
-      } else {
-        *dynrel++ = ElfRel<E>(P, R_X86_64_64, sym.get_dynsym_idx(ctx), A);
-        write64(A);
-      }
-      continue;
-    case R_X86_64_PLT32:
-      write32s(S + A - P);
-      continue;
-    case R_X86_64_PLTOFF64:
-      write64(S + A - GOT);
-      break;
-    case R_X86_64_GOT32:
-      write32s(G + A);
-      continue;
-    case R_X86_64_GOT64:
-      write64(G + A);
-      continue;
-    case R_X86_64_GOTOFF64:
-      write64(S + A - GOT);
-      continue;
-    case R_X86_64_GOTPC32:
-      write32s(GOT + A - P);
-      continue;
-    case R_X86_64_GOTPC64:
-      write64(GOT + A - P);
-      continue;
-    case R_X86_64_GOTPCREL:
-      write32s(G + GOT + A - P);
-      continue;
-    case R_X86_64_GOTPCREL64:
-      write64(G + GOT + A - P);
-      continue;
-    case R_X86_64_GOTPCRELX:
-      if (sym.get_got_idx(ctx) == -1) {
-        u32 insn = relax_gotpcrelx(loc - 2);
-        loc[-2] = insn >> 8;
-        loc[-1] = insn;
-        write32s(S + A - P);
-      } else {
-        write32s(G + GOT + A - P);
-      }
-      continue;
-    case R_X86_64_REX_GOTPCRELX:
-      if (sym.get_got_idx(ctx) == -1) {
-        u32 insn = relax_rex_gotpcrelx(loc - 3);
-        loc[-3] = insn >> 16;
-        loc[-2] = insn >> 8;
-        loc[-1] = insn;
-        write32s(S + A - P);
-      } else {
-        write32s(G + GOT + A - P);
-      }
-      continue;
-    case R_X86_64_TLSGD:
-      if (sym.get_tlsgd_idx(ctx) == -1) {
-        // Relax GD to LE
-        i64 val = S - ctx.tls_end + A + 4;
-        overflow_check(val, -((i64)1 << 31), (i64)1 << 31);
-
-        switch (rels[i + 1].r_type) {
-        case R_X86_64_PLT32:
-        case R_X86_64_GOTPCREL:
-        case R_X86_64_GOTPCRELX: {
-          static const u8 insn[] = {
-            0x64, 0x48, 0x8b, 0x04, 0x25, 0, 0, 0, 0, // mov %fs:0, %rax
-            0x48, 0x8d, 0x80, 0,    0,    0, 0,       // lea 0(%rax), %rax
-          };
-          memcpy(loc - 4, insn, sizeof(insn));
-          *(ul32 *)(loc + 8) = val;
-          break;
-        }
-        case R_X86_64_PLTOFF64: {
-          static const u8 insn[] = {
-            0x64, 0x48, 0x8b, 0x04, 0x25, 0, 0, 0, 0, // mov %fs:0, %rax
-            0x48, 0x8d, 0x80, 0,    0,    0, 0,       // lea 0(%rax), %rax
-            0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00,       // nop
-          };
-          memcpy(loc - 3, insn, sizeof(insn));
-          *(ul32 *)(loc + 9) = val;
-          break;
-        }
-        default:
-          unreachable();
-        }
-
-        i++;
-      } else {
-        write32s(sym.get_tlsgd_addr(ctx) + A - P);
-      }
-      continue;
-    case R_X86_64_TLSLD:
-      if (ctx.got->tlsld_idx == -1) {
-        // Relax LD to LE
-        switch (rels[i + 1].r_type) {
-        case R_X86_64_PLT32: {
-          static const u8 insn[] = {
-            0x66, 0x66, 0x66,                         // (padding)
-            0x64, 0x48, 0x8b, 0x04, 0x25, 0, 0, 0, 0, // mov %fs:0, %rax
-          };
-          memcpy(loc - 3, insn, sizeof(insn));
-          break;
-        }
-        case R_X86_64_GOTPCREL:
-        case R_X86_64_GOTPCRELX: {
-          static const u8 insn[] = {
-            0x66, 0x66, 0x66,                         // (padding)
-            0x64, 0x48, 0x8b, 0x04, 0x25, 0, 0, 0, 0, // mov %fs:0, %rax
-            0x90,                                     // nop
-          };
-          memcpy(loc - 3, insn, sizeof(insn));
-          break;
-        }
-        case R_X86_64_PLTOFF64: {
-          static const u8 insn[] = {
-            0x66, 0x66, 0x66,                         // (padding)
-            0x64, 0x48, 0x8b, 0x04, 0x25, 0, 0, 0, 0, // mov %fs:0, %rax
-            0x66, 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00, // nop
-          };
-          memcpy(loc - 3, insn, sizeof(insn));
-          break;
-        }
-        default:
-          unreachable();
-        }
-
-        i++;
-      } else {
-        write32s(ctx.got->get_tlsld_addr(ctx) + A - P);
-      }
-      continue;
-    case R_X86_64_DTPOFF32:
-      if (ctx.arg.relax && !ctx.arg.shared)
-        write32s(S + A - ctx.tls_end);
-      else
-        write32s(S + A - ctx.tls_begin);
-      continue;
-    case R_X86_64_DTPOFF64:
-      if (ctx.arg.relax && !ctx.arg.shared)
-        write64(S + A - ctx.tls_end);
-      else
-        write64(S + A - ctx.tls_begin);
-      continue;
-    case R_X86_64_TPOFF32:
-      write32s(S + A - ctx.tls_end);
-      continue;
-    case R_X86_64_TPOFF64:
-      write64(S + A - ctx.tls_end);
-      continue;
-    case R_X86_64_GOTTPOFF:
-      if (sym.get_gottp_idx(ctx) == -1) {
-        u32 insn = relax_gottpoff(loc - 3);
-        loc[-3] = insn >> 16;
-        loc[-2] = insn >> 8;
-        loc[-1] = insn;
-        write32s(S + A - ctx.tls_end + 4);
-      } else {
-        write32s(sym.get_gottp_addr(ctx) + A - P);
-      }
-      continue;
-    case R_X86_64_GOTPC32_TLSDESC:
-      if (sym.get_tlsdesc_idx(ctx) == -1) {
-        u32 insn = relax_gotpc32_tlsdesc(loc - 3);
-        loc[-3] = insn >> 16;
-        loc[-2] = insn >> 8;
-        loc[-1] = insn;
-        write32s(S + A - ctx.tls_end + 4);
-      } else {
-        write32s(sym.get_tlsdesc_addr(ctx) + A - P);
-      }
-      continue;
-    case R_X86_64_SIZE32:
-      write32(sym.esym().st_size + A);
-      continue;
-    case R_X86_64_SIZE64:
-      write64(sym.esym().st_size + A);
-      continue;
-    case R_X86_64_TLSDESC_CALL:
-      if (sym.get_tlsdesc_idx(ctx) == -1) {
-        // call *(%rax) -> nop
-        loc[0] = 0x66;
-        loc[1] = 0x90;
-      }
-      continue;
-    default:
-      unreachable();
-    }
-
-#undef S
-#undef A
-#undef P
-#undef G
-#undef GOT
-  }
-}
-
-// This function is responsible for applying relocations against
-// non-SHF_ALLOC sections (i.e. sections that are not mapped to memory
-// at runtime).
-//
-// Relocations against non-SHF_ALLOC sections are much easier to
-// handle than that against SHF_ALLOC sections. It is because, since
-// they are not mapped to memory, they don't contain any variable or
-// function and never need PLT or GOT. Non-SHF_ALLOC sections are
-// mostly debug info sections.
-//
-// Relocations against non-SHF_ALLOC sections are not scanned by
-// scan_relocations.
-template <>
-void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_X86_64_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = base + rel.r_offset;
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    SectionFragment<E> *frag;
-    i64 addend;
-    std::tie(frag, addend) = get_fragment(ctx, rel);
-
-    auto overflow_check = [&](i64 val, i64 lo, i64 hi) {
-      if (val < lo || hi <= val)
-        Error(ctx) << *this << ": relocation " << rel << " against "
-                   << sym << " out of range: " << val << " is not in ["
-                   << lo << ", " << hi << ")";
-    };
-
-    auto write8 = [&](u64 val) {
-      overflow_check(val, 0, 1 << 8);
-      *loc = val;
-    };
-
-    auto write16 = [&](u64 val) {
-      overflow_check(val, 0, 1 << 16);
-      *(ul16 *)loc = val;
-    };
-
-    auto write32 = [&](u64 val) {
-      overflow_check(val, 0, (i64)1 << 32);
-      *(ul32 *)loc = val;
-    };
-
-    auto write32s = [&](u64 val) {
-      overflow_check(val, -((i64)1 << 31), (i64)1 << 31);
-      *(ul32 *)loc = val;
-    };
-
-#define S (frag ? frag->get_addr(ctx) : sym.get_addr(ctx))
-#define A (frag ? (u64)addend : (u64)rel.r_addend)
-
-    switch (rel.r_type) {
-    case R_X86_64_8:
-      write8(S + A);
-      break;
-    case R_X86_64_16:
-      write16(S + A);
-      break;
-    case R_X86_64_32:
-      write32(S + A);
-      break;
-    case R_X86_64_32S:
-      write32s(S + A);
-      break;
-    case R_X86_64_64:
-      if (!frag) {
-        if (std::optional<u64> val = get_tombstone(sym)) {
-          *(ul64 *)loc = *val;
-          break;
-        }
-      }
-      *(ul64 *)loc = S + A;
-      break;
-    case R_X86_64_DTPOFF32:
-      if (std::optional<u64> val = get_tombstone(sym))
-        *(ul32 *)loc = *val;
-      else
-        write32s(S + A - ctx.tls_begin);
-      break;
-    case R_X86_64_DTPOFF64:
-      if (std::optional<u64> val = get_tombstone(sym))
-        *(ul64 *)loc = *val;
-      else
-        *(ul64 *)loc = S + A - ctx.tls_begin;
-      break;
-    case R_X86_64_SIZE32:
-      write32(sym.esym().st_size + A);
-      break;
-    case R_X86_64_SIZE64:
-      *(ul64 *)loc = sym.esym().st_size + A;
-      break;
-    default:
-      Fatal(ctx) << *this << ": invalid relocation for non-allocated sections: "
-                 << rel;
-      break;
-    }
-
-#undef S
-#undef A
-  }
-}
-
-// Linker has to create data structures in an output file to apply
-// some type of relocations. For example, if a relocation refers a GOT
-// or a PLT entry of a symbol, linker has to create an entry in .got
-// or in .plt for that symbol. In order to fix the file layout, we
-// need to scan relocations.
-template <>
-void InputSection<E>::scan_relocations(Context<E> &ctx) {
-  assert(shdr().sh_flags & SHF_ALLOC);
-
-  this->reldyn_offset = file.num_dynrel * sizeof(ElfRel<E>);
-  std::span<const ElfRel<E>> rels = get_rels(ctx);
-
-  // Scan relocations
-  for (i64 i = 0; i < rels.size(); i++) {
-    const ElfRel<E> &rel = rels[i];
-    if (rel.r_type == R_X86_64_NONE)
-      continue;
-
-    Symbol<E> &sym = *file.symbols[rel.r_sym];
-    u8 *loc = (u8 *)(contents.data() + rel.r_offset);
-
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
-    if (sym.get_type() == STT_GNU_IFUNC) {
-      sym.flags |= NEEDS_GOT;
-      sym.flags |= NEEDS_PLT;
-    }
-
-    switch (rel.r_type) {
-    case R_X86_64_8:
-    case R_X86_64_16:
-    case R_X86_64_32:
-    case R_X86_64_32S: {
-      // Dynamic linker does not support 8, 16 or 32-bit dynamic
-      // relocations for these types of relocations. We report an
-      // error if we cannot relocate them even at load-time.
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  NONE,     ERROR, ERROR,         ERROR },      // DSO
-        {  NONE,     ERROR, ERROR,         ERROR },      // PIE
-        {  NONE,     NONE,  COPYREL,       CPLT  },      // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_X86_64_64: {
-      // Unlike the above, we can use R_X86_64_RELATIVE and R_86_64_64
-      // relocations.
-      Action table[][4] = {
-        // Absolute  Local    Imported data  Imported code
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // DSO
-        {  NONE,     BASEREL, DYNREL,        DYNREL },     // PIE
-        {  NONE,     NONE,    COPYREL,       CPLT   },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_X86_64_PC8:
-    case R_X86_64_PC16:
-    case R_X86_64_PC32: {
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  ERROR,    NONE,  ERROR,         ERROR },      // DSO
-        {  ERROR,    NONE,  COPYREL,       PLT   },      // PIE
-        {  NONE,     NONE,  COPYREL,       PLT   },      // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_X86_64_PC64: {
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  ERROR,    NONE,  DYNREL,        DYNREL },     // DSO
-        {  ERROR,    NONE,  COPYREL,       PLT    },     // PIE
-        {  NONE,     NONE,  COPYREL,       PLT    },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_X86_64_GOT32:
-    case R_X86_64_GOT64:
-    case R_X86_64_GOTPC32:
-    case R_X86_64_GOTPC64:
-    case R_X86_64_GOTPCREL:
-    case R_X86_64_GOTPCREL64:
-      sym.flags |= NEEDS_GOT;
-      break;
-    case R_X86_64_GOTPCRELX: {
-      if (rel.r_addend != -4)
-        Fatal(ctx) << *this << ": bad r_addend for R_X86_64_GOTPCRELX";
-
-      bool do_relax = ctx.arg.relax && !sym.is_imported &&
-                      sym.is_relative() && relax_gotpcrelx(loc - 2);
-      if (!do_relax)
-        sym.flags |= NEEDS_GOT;
-      break;
-    }
-    case R_X86_64_REX_GOTPCRELX: {
-      if (rel.r_addend != -4)
-        Fatal(ctx) << *this << ": bad r_addend for R_X86_64_REX_GOTPCRELX";
-
-      bool do_relax = ctx.arg.relax && !sym.is_imported &&
-                      sym.is_relative() && relax_rex_gotpcrelx(loc - 3);
-      if (!do_relax)
-        sym.flags |= NEEDS_GOT;
-      break;
-    }
-    case R_X86_64_PLT32:
-    case R_X86_64_PLTOFF64: {
-      Action table[][4] = {
-        // Absolute  Local  Imported data  Imported code
-        {  NONE,     NONE,  PLT,           PLT    },     // DSO
-        {  NONE,     NONE,  PLT,           PLT    },     // PIE
-        {  NONE,     NONE,  PLT,           PLT    },     // PDE
-      };
-      dispatch(ctx, table, i, rel, sym);
-      break;
-    }
-    case R_X86_64_TLSGD: {
-      if (i + 1 == rels.size())
-        Fatal(ctx) << *this << ": TLSGD reloc must be followed by PLT or GOTPCREL";
-
-      if (u32 ty = rels[i + 1].r_type;
-          ty != R_X86_64_PLT32 && ty != R_X86_64_PLTOFF64 &&
-          ty != R_X86_64_GOTPCREL && ty != R_X86_64_GOTPCRELX)
-        Fatal(ctx) << *this << ": TLSGD reloc must be followed by PLT or GOTPCREL";
-
-      if (ctx.arg.relax && !ctx.arg.shared && !sym.is_imported)
-        i++;
-      else
-        sym.flags |= NEEDS_TLSGD;
-      break;
-    }
-    case R_X86_64_TLSLD: {
-      if (i + 1 == rels.size())
-        Fatal(ctx) << *this << ": TLSLD reloc must be followed by PLT or GOTPCREL";
-
-      if (u32 ty = rels[i + 1].r_type;
-          ty != R_X86_64_PLT32 && ty != R_X86_64_PLTOFF64 &&
-          ty != R_X86_64_GOTPCREL && ty != R_X86_64_GOTPCRELX)
-        Fatal(ctx) << *this << ": TLSLD reloc must be followed by PLT or GOTPCREL";
-
-      if (ctx.arg.relax && !ctx.arg.shared)
-        i++;
-      else
-        ctx.needs_tlsld = true;
-      break;
-    }
-    case R_X86_64_GOTTPOFF: {
-      ctx.has_gottp_rel = true;
-
-      bool do_relax = ctx.arg.relax && !ctx.arg.shared &&
-                      !sym.is_imported && relax_gottpoff(loc - 3);
-      if (!do_relax)
-        sym.flags |= NEEDS_GOTTP;
-      break;
-    }
-    case R_X86_64_GOTPC32_TLSDESC: {
-      if (relax_gotpc32_tlsdesc(loc - 3) == 0)
-        Fatal(ctx) << *this << ": GOTPC32_TLSDESC relocation is used"
-                   << " against an invalid code sequence";
-
-      bool do_relax = ctx.relax_tlsdesc && !sym.is_imported;
-      if (!do_relax)
-        sym.flags |= NEEDS_TLSDESC;
-      break;
-    }
-    case R_X86_64_GOTOFF64:
-    case R_X86_64_DTPOFF32:
-    case R_X86_64_DTPOFF64:
-    case R_X86_64_TPOFF32:
-    case R_X86_64_TPOFF64:
-    case R_X86_64_SIZE32:
-    case R_X86_64_SIZE64:
-    case R_X86_64_TLSDESC_CALL:
-      break;
-    default:
-      Error(ctx) << *this << ": unknown relocation: " << rel;
-    }
-  }
-}
-
-} // namespace mold::elf

elf/dwarf.cc

@@ -1,510 +0,0 @@
-#include "mold.h"
-
-namespace mold::elf {
-
-// The hash function for .gdb_index.
-static u32 gdb_hash(std::string_view name) {
-  u32 h = 0;
-  for (u8 c : name) {
-    if ('A' <= c && c <= 'Z')
-      c = 'a' + c - 'A';
-    h = h * 67 + c - 113;
-  }
-  return h;
-}
-
-// Split .debug_info into so-called "compilation units". A .debug_info
-// section usually contains one compunit unless it was created by `ld -r`.
-// This is for --gdb-index.
-template <typename E>
-std::vector<std::string_view>
-read_compunits(Context<E> &ctx, ObjectFile<E> &file) {
-  file.debug_info->uncompress(ctx);
-  std::string_view data = file.debug_info->contents;
-  std::vector<std::string_view> vec;
-
-  while (!data.empty()) {
-    if (data.size() < 4)
-      Fatal(ctx) << *file.debug_info << ": corrupted .debug_info";
-    if (*(ul32 *)data.data() == 0xffffffff)
-      Fatal(ctx) << *file.debug_info << ": --gdb-index: DWARF64 not supported";
-    i64 len = *(ul32 *)data.data() + 4;
-    vec.push_back(data.substr(0, len));
-    data = data.substr(len);
-  }
-  return vec;
-}
-
-// Parses .debug_gnu_pubnames and .debug_gnu_pubtypes. These sections
-// start with a 14 bytes header followed by (4-byte offset, 1-byte type,
-// null-terminated string) tuples.
-//
-// The 4-byte offset is an offset into .debug_info that contains details
-// about the name. The 1-byte type is a type of the corresponding name
-// (e.g. function, variable or datatype). The string is a name of a
-// function, a variable or a type.
-template <typename E>
-std::vector<GdbIndexName> read_pubnames(Context<E> &ctx, ObjectFile<E> &file) {
-  std::vector<GdbIndexName> vec;
-
-  auto get_cu_idx = [&](InputSection<E> &isec, i64 offset) {
-    i64 off = 0;
-    for (i64 i = 0; i < file.compunits.size(); i++) {
-      if (offset == off)
-        return file.compunits_idx + i;
-      off += file.compunits[i].size();
-    }
-    Fatal(ctx) << isec << ": corrupted debug_info_offset";
-  };
-
-  auto read = [&](InputSection<E> &isec) {
-    isec.uncompress(ctx);
-    std::string_view contents = isec.contents;
-
-    while (!contents.empty()) {
-      if (contents.size() < 14)
-        Fatal(ctx) << isec << ": corrupted header";
-
-      u32 len = *(ul32 *)contents.data() + 4;
-      u32 debug_info_offset = *(ul32 *)(contents.data() + 6);
-      u32 cu_idx = get_cu_idx(isec, debug_info_offset);
-
-      std::string_view data = contents.substr(14, len - 14);
-      contents = contents.substr(len);
-
-      while (!data.empty()) {
-        u32 offset = *(ul32 *)data.data();
-        data = data.substr(4);
-        if (offset == 0)
-          break;
-
-        u8 type = data[0];
-        data = data.substr(1);
-
-        std::string_view name = data.data();
-        data = data.substr(name.size() + 1);
-
-        vec.push_back({name, gdb_hash(name), (type << 24) | cu_idx});
-      }
-    }
-  };
-
-  if (file.debug_pubnames)
-    read(*file.debug_pubnames);
-  if (file.debug_pubtypes)
-    read(*file.debug_pubtypes);
-
-  // Uniquify elements because GCC 11 seems to emit one record for each
-  // comdat group which results in having a lot of duplicate records.
-  auto less = [](const GdbIndexName &a, const GdbIndexName &b) {
-    return std::tuple{a.hash, a.attr, a.name} <
-           std::tuple{b.hash, b.attr, b.name};
-  };
-
-  auto equal = [](const GdbIndexName &a, const GdbIndexName &b) {
-    return std::tuple{a.hash, a.attr, a.name} ==
-           std::tuple{b.hash, b.attr, b.name};
-  };
-
-  std::sort(vec.begin(), vec.end(), less);
-  vec.erase(std::unique(vec.begin(), vec.end(), equal), vec.end());
-  return vec;
-}
-
-template <typename E>
-static u8 *get_buffer(Context<E> &ctx, Chunk<E> *chunk) {
-  if (u8 *buf = chunk->get_uncompressed_data())
-    return buf;
-  return ctx.buf + chunk->shdr.sh_offset;
-}
-
-// Try to find a compilation unit from .debug_info and its
-// corresponding record from .debug_abbrev and returns them.
-template <typename E>
-static std::tuple<u8 *, u8 *, u32>
-find_compunit(Context<E> &ctx, ObjectFile<E> &file, i64 offset) {
-  // Read .debug_info to find the record at a given offset.
-  u8 *cu = get_buffer(ctx, ctx.debug_info) + offset;
-  u32 dwarf_version = *(ul16 *)(cu + 4);
-  u32 abbrev_offset;
-
-  // Skip a header.
-  switch (dwarf_version) {
-  case 2:
-  case 3:
-  case 4:
-    abbrev_offset = *(ul32 *)(cu + 6);
-    if (u32 address_size = cu[10]; address_size != E::word_size)
-      Fatal(ctx) << file << ": --gdb-index: unsupported address size "
-                 << address_size;
-    cu += 11;
-    break;
-  case 5: {
-    abbrev_offset = *(ul32 *)(cu + 8);
-    if (u32 address_size = cu[7]; address_size != E::word_size)
-      Fatal(ctx) << file << ": --gdb-index: unsupported address size "
-                 << address_size;
-
-    switch (u32 unit_type = cu[6]; unit_type) {
-    case DW_UT_compile:
-    case DW_UT_partial:
-      cu += 12;
-      break;
-    case DW_UT_skeleton:
-    case DW_UT_split_compile:
-      cu += 20;
-      break;
-    default:
-      Fatal(ctx) << file << ": --gdb-index: unknown DW_UT_* value: 0x"
-                 << std::hex << unit_type;
-    }
-    break;
-  }
-  default:
-    Fatal(ctx) << file << ": --gdb-index: unknown DWARF version: "
-               << dwarf_version;
-  }
-
-  u32 abbrev_code = read_uleb(cu);
-
-  // Find a .debug_abbrev record corresponding to the .debug_info record.
-  // We assume the .debug_info record at a given offset is of
-  // DW_TAG_compile_unit which describes a compunit.
-  u8 *abbrev = get_buffer(ctx, ctx.debug_abbrev) + abbrev_offset;
-
-  for (;;) {
-    u32 code = read_uleb(abbrev);
-    if (code == 0)
-      Fatal(ctx) << file << ": --gdb-index: .debug_abbrev does not contain"
-                 << " a record for the first .debug_info record";
-
-    if (code == abbrev_code) {
-      // Found a record
-      u64 abbrev_tag = read_uleb(abbrev);
-      if (abbrev_tag != DW_TAG_compile_unit && abbrev_tag != DW_TAG_skeleton_unit)
-        Fatal(ctx) << file << ": --gdb-index: the first entry's tag is not"
-                   << " DW_TAG_compile_unit/DW_TAG_skeleton_unit but 0x"
-                   << std::hex << abbrev_tag;
-      break;
-    }
-
-    // Skip an uninteresting record
-    read_uleb(abbrev); // tag
-    abbrev++; // has_children byte
-    for (;;) {
-      u64 name = read_uleb(abbrev);
-      u64 form = read_uleb(abbrev);
-      if (name == 0 && form == 0)
-        break;
-      if (form == DW_FORM_implicit_const)
-        read_uleb(abbrev);
-    }
-  }
-
-  abbrev++; // skip has_children byte
-  return {cu, abbrev, dwarf_version};
-}
-
-// Estimate the number of address ranges contained in a given file.
-// It may over-estimate but never under-estimate.
-template <typename E>
-i64 estimate_address_areas(Context<E> &ctx, ObjectFile<E> &file) {
-  // Each CU contains zero or one address area.
-  i64 ret = file.compunits.size();
-
-  // In DWARF 4, a CU can refer address ranges in .debug_ranges.
-  // .debug_ranges contains a vector of [begin, end) address pairs.
-  // The last entry must be a null terminator, so we do -1.
-  if (file.debug_ranges)
-    ret += file.debug_ranges->sh_size / E::word_size / 2 - 1;
-
-  // In DWARF 5, a CU can refer address ranges in .debug_rnglists, which
-  // contains variable-length entries. The smallest possible range entry
-  // is one byte for the code and two ULEB128 values (each can be as
-  // small as one byte), so 3 bytes.
-  if (file.debug_rnglists)
-    ret += file.debug_rnglists->sh_size / 3;
-  return ret;
-}
-
-// .debug_info contains variable-length fields. This class reads them.
-template <typename E>
-class DebugInfoReader {
-public:
-  DebugInfoReader(Context<E> &ctx, ObjectFile<E> &file, u8 *cu)
-    : ctx(ctx), file(file), cu(cu) {}
-
-  u64 read(u64 form);
-
-  Context<E> &ctx;
-  ObjectFile<E> &file;
-  u8 *cu;
-};
-
-// Read value of the given DW_FORM_* form. If a value is not scalar,
-// returns a dummy value 0.
-template <typename E>
-inline u64 DebugInfoReader<E>::read(u64 form) {
-  switch (form) {
-  case DW_FORM_flag_present:
-    return 0;
-  case DW_FORM_data1:
-  case DW_FORM_flag:
-  case DW_FORM_strx1:
-  case DW_FORM_addrx1:
-  case DW_FORM_ref1:
-    return *cu++;
-  case DW_FORM_data2:
-  case DW_FORM_strx2:
-  case DW_FORM_addrx2:
-  case DW_FORM_ref2: {
-    u64 val = *(ul16 *)cu;
-    cu += 2;
-    return val;
-  }
-  case DW_FORM_strx3:
-  case DW_FORM_addrx3: {
-    u64 val = *(ul24 *)cu;
-    cu += 3;
-    return val;
-  }
-  case DW_FORM_data4:
-  case DW_FORM_strp:
-  case DW_FORM_sec_offset:
-  case DW_FORM_line_strp:
-  case DW_FORM_strx4:
-  case DW_FORM_addrx4:
-  case DW_FORM_ref4: {
-    u64 val = *(ul32 *)cu;
-    cu += 4;
-    return val;
-  }
-  case DW_FORM_data8:
-  case DW_FORM_ref8: {
-    u64 val = *(ul64 *)cu;
-    cu += 8;
-    return val;
-  }
-  case DW_FORM_addr:
-  case DW_FORM_ref_addr: {
-    u64 val = *(typename E::WordTy *)cu;
-    cu += E::word_size;
-    return val;
-  }
-  case DW_FORM_strx:
-  case DW_FORM_addrx:
-  case DW_FORM_udata:
-  case DW_FORM_ref_udata:
-  case DW_FORM_loclistx:
-  case DW_FORM_rnglistx:
-    return read_uleb(cu);
-  case DW_FORM_string:
-    cu += strlen((char *)cu) + 1;
-    return 0;
-  default:
-    Fatal(ctx) << file << ": --gdb-index: unhandled debug info form: 0x"
-               << std::hex << form;
-    return 0;
-  }
-}
-
-// Read a range list from .debug_ranges starting at the given offset
-// (until an end of list entry).
-template <typename E>
-static std::vector<u64>
-read_debug_range(Context<E> &ctx, ObjectFile<E> &file, typename E::WordTy *range) {
-  std::vector<u64> vec;
-  u64 base = 0;
-
-  for (i64 i = 0; range[i] || range[i + 1]; i += 2) {
-    if (range[i] + 1 == 0) {
-      // base address selection entry
-      base = range[i + 1];
-    } else {
-      vec.push_back(range[i] + base);
-      vec.push_back(range[i + 1] + base);
-    }
-  }
-  return vec;
-}
-
-// Read a range list from .debug_rnglists starting at the given offset
-// (until an end of list entry).
-template <typename E>
-static std::vector<u64>
-read_rnglist_range(Context<E> &ctx, ObjectFile<E> &file, u8 *rnglist,
-                   typename E::WordTy *addrx) {
-  std::vector<u64> vec;
-  u64 base = 0;
-
-  for (;;) {
-    switch (*rnglist++) {
-    case DW_RLE_end_of_list:
-      return vec;
-    case DW_RLE_base_addressx:
-      base = addrx[read_uleb(rnglist)];
-      break;
-    case DW_RLE_startx_endx:
-      vec.push_back(addrx[read_uleb(rnglist)]);
-      vec.push_back(addrx[read_uleb(rnglist)]);
-      break;
-    case DW_RLE_startx_length:
-      vec.push_back(addrx[read_uleb(rnglist)]);
-      vec.push_back(vec.back() + read_uleb(rnglist));
-      break;
-    case DW_RLE_offset_pair:
-      vec.push_back(base + read_uleb(rnglist));
-      vec.push_back(base + read_uleb(rnglist));
-      break;
-    case DW_RLE_base_address:
-      base = *(typename E::WordTy *)rnglist;
-      rnglist += E::word_size;
-      break;
-    case DW_RLE_start_end:
-      vec.push_back(*(typename E::WordTy *)rnglist);
-      rnglist += E::word_size;
-      vec.push_back(*(typename E::WordTy *)rnglist);
-      rnglist += E::word_size;
-      break;
-    case DW_RLE_start_length:
-      vec.push_back(*(typename E::WordTy *)rnglist);
-      rnglist += E::word_size;
-      vec.push_back(vec.back() + read_uleb(rnglist));
-      break;
-    }
-  }
-}
-
-// Returns a list of address ranges explained by a compunit at the
-// `offset` in an output .debug_info section.
-//
-// .debug_info contains DWARF debug info records, so this function
-// parses DWARF. If a designated compunit contains multiple ranges, the
-// ranges are read from .debug_ranges (or .debug_rnglists for DWARF5).
-// Otherwise, a range is read directly from .debug_info (or possibly
-// from .debug_addr for DWARF5).
-template <typename E>
-std::vector<u64>
-read_address_areas(Context<E> &ctx, ObjectFile<E> &file, i64 offset) {
-  u8 *cu;
-  u8 *abbrev;
-  u32 dwarf_version;
-  std::tie(cu, abbrev, dwarf_version) = find_compunit(ctx, file, offset);
-
-  DebugInfoReader<E> reader{ctx, file, cu};
-
-  struct Record {
-    u64 form = 0;
-    u64 value = 0;
-  };
-
-  Record low_pc;
-  Record high_pc;
-  Record ranges;
-  std::optional<u64> rnglists_base;
-  typename E::WordTy *addrx = nullptr;
-
-  // Read all interesting debug records.
-  for (;;) {
-    u64 name = read_uleb(abbrev);
-    u64 form = read_uleb(abbrev);
-    if (name == 0 && form == 0)
-      break;
-
-    u64 val = reader.read(form);
-
-    switch (name) {
-    case DW_AT_low_pc:
-      low_pc = {form, val};
-      break;
-    case DW_AT_high_pc:
-      high_pc = {form, val};
-      break;
-    case DW_AT_rnglists_base:
-      rnglists_base = val;
-      break;
-    case DW_AT_addr_base:
-      addrx = (typename E::WordTy *)(get_buffer(ctx, ctx.debug_addr) + val);
-      break;
-    case DW_AT_ranges:
-      ranges = {form, val};
-      break;
-    }
-  }
-
-  // Handle non-contiguous address ranges.
-  if (ranges.form) {
-    if (dwarf_version <= 4) {
-       typename E::WordTy *range_begin =
-        (typename E::WordTy *)(get_buffer(ctx, ctx.debug_ranges) + ranges.value);
-      return read_debug_range(ctx, file, range_begin);
-    }
-
-    assert(dwarf_version == 5);
-
-    u8 *buf = get_buffer(ctx, ctx.debug_rnglists);
-    if (ranges.form == DW_FORM_sec_offset)
-      return read_rnglist_range(ctx, file, buf + ranges.value, addrx);
-
-    if (!rnglists_base)
-      Fatal(ctx) << file << ": --gdb-index: missing DW_AT_rnglists_base";
-
-    u8 *base = buf + *rnglists_base;
-    return read_rnglist_range(ctx, file, base + *(ul32 *)base, addrx);
-  }
-
-  // Handle a contiguous address range.
-  if (low_pc.form && high_pc.form) {
-    u64 lo;
-
-    switch (low_pc.form) {
-    case DW_FORM_addr:
-      lo = low_pc.value;
-      break;
-    case DW_FORM_addrx:
-    case DW_FORM_addrx1:
-    case DW_FORM_addrx2:
-    case DW_FORM_addrx4:
-      lo = addrx[low_pc.value];
-      break;
-    default:
-      Fatal(ctx) << file << ": --gdb-index: unhandled form for DW_AT_low_pc: 0x"
-                 << std::hex << high_pc.form;
-    }
-
-    switch (high_pc.form) {
-    case DW_FORM_addr:
-      return {lo, high_pc.value};
-    case DW_FORM_addrx:
-    case DW_FORM_addrx1:
-    case DW_FORM_addrx2:
-    case DW_FORM_addrx4:
-      return {lo, addrx[high_pc.value]};
-    case DW_FORM_udata:
-    case DW_FORM_data1:
-    case DW_FORM_data2:
-    case DW_FORM_data4:
-    case DW_FORM_data8:
-      return {lo, lo + high_pc.value};
-    default:
-      Fatal(ctx) << file << ": --gdb-index: unhandled form for DW_AT_high_pc: 0x"
-                 << std::hex << high_pc.form;
-    }
-  }
-
-  return {};
-}
-
-#define INSTANTIATE(E)                                                  \
-  template std::vector<std::string_view>                                \
-  read_compunits(Context<E> &, ObjectFile<E> &);                        \
-  template std::vector<GdbIndexName>                                    \
-  read_pubnames(Context<E> &, ObjectFile<E> &);                         \
-  template i64                                                          \
-  estimate_address_areas(Context<E> &, ObjectFile<E> &);                \
-  template std::vector<u64>                                             \
-  read_address_areas(Context<E> &, ObjectFile<E> &, i64)
-
-INSTANTIATE_ALL;
-
-} // namespace mold::elf

elf/gc-sections.cc

@@ -1,202 +0,0 @@
-// This file implements a mark-sweep garbage collector for -gc-sections.
-// In this algorithm, vertices are sections and edges are relocations.
-// Any section that is reachable from a root section is considered alive.
-
-#include "mold.h"
-
-#include <tbb/concurrent_vector.h>
-#include <tbb/parallel_for_each.h>
-
-namespace mold::elf {
-
-template <typename E>
-static bool is_init_fini(const InputSection<E> &isec) {
-  u32 type = isec.shdr().sh_type;
-  std::string_view name = isec.name();
-
-  return type == SHT_INIT_ARRAY ||
-         type == SHT_FINI_ARRAY ||
-         type == SHT_PREINIT_ARRAY ||
-         (std::is_same_v<E, ARM32> && type == SHT_ARM_EXIDX) ||
-         name.starts_with(".ctors") ||
-         name.starts_with(".dtors") ||
-         name.starts_with(".init") ||
-         name.starts_with(".fini");
-}
-
-template <typename E>
-static bool mark_section(InputSection<E> *isec) {
-  return isec && isec->is_alive && !isec->is_visited.exchange(true);
-}
-
-template <typename E>
-static void visit(Context<E> &ctx, InputSection<E> *isec,
-                  tbb::feeder<InputSection<E> *> &feeder, i64 depth) {
-  assert(isec->is_visited);
-
-  // A relocation can refer either a section fragment (i.e. a piece of
-  // string in a mergeable string section) or a symbol. Mark all
-  // section fragments as alive.
-  if (SectionFragmentRef<E> *refs = isec->rel_fragments.get())
-    for (i64 i = 0; refs[i].idx >= 0; i++)
-      refs[i].frag->is_alive.store(true, std::memory_order_relaxed);
-
-  // If this is a text section, .eh_frame may contain records
-  // describing how to handle exceptions for that function.
-  // We want to keep associated .eh_frame records.
-  for (FdeRecord<E> &fde : isec->get_fdes())
-    for (const ElfRel<E> &rel : fde.get_rels(isec->file).subspan(1))
-      if (Symbol<E> *sym = isec->file.symbols[rel.r_sym])
-        if (mark_section(sym->get_input_section()))
-          feeder.add(sym->get_input_section());
-
-  for (const ElfRel<E> &rel : isec->get_rels(ctx)) {
-    Symbol<E> &sym = *isec->file.symbols[rel.r_sym];
-
-    // Symbol can refer either a section fragment or an input section.
-    // Mark a fragment as alive.
-    if (SectionFragment<E> *frag = sym.get_frag()) {
-      frag->is_alive.store(true, std::memory_order_relaxed);
-      continue;
-    }
-
-    if (!mark_section(sym.get_input_section()))
-      continue;
-
-    // Mark a section alive. For better performacne, we don't call
-    // `feeder.add` too often.
-    if (depth < 3)
-      visit(ctx, sym.get_input_section(), feeder, depth + 1);
-    else
-      feeder.add(sym.get_input_section());
-  }
-}
-
-template <typename E>
-static void collect_root_set(Context<E> &ctx,
-                             tbb::concurrent_vector<InputSection<E> *> &rootset) {
-  Timer t(ctx, "collect_root_set");
-
-  auto enqueue_section = [&](InputSection<E> *isec) {
-    if (mark_section(isec))
-      rootset.push_back(isec);
-  };
-
-  auto enqueue_symbol = [&](Symbol<E> *sym) {
-    if (sym) {
-      if (SectionFragment<E> *frag = sym->get_frag())
-        frag->is_alive.store(true, std::memory_order_relaxed);
-      else
-        enqueue_section(sym->get_input_section());
-    }
-  };
-
-  // Add sections that are not subject to garbage collection.
-  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
-    for (std::unique_ptr<InputSection<E>> &isec : file->sections) {
-      if (!isec || !isec->is_alive)
-        continue;
-
-      // -gc-sections discards only SHF_ALLOC sections. If you want to
-      // reduce the amount of non-memory-mapped segments, you should
-      // use `strip` command, compile without debug info or use
-      // -strip-all linker option.
-      u32 flags = isec->shdr().sh_flags;
-      if (!(flags & SHF_ALLOC))
-        isec->is_visited = true;
-
-      if (is_init_fini(*isec) || is_c_identifier(isec->name()) ||
-          (flags & SHF_GNU_RETAIN) || isec->shdr().sh_type == SHT_NOTE)
-        enqueue_section(isec.get());
-    }
-  });
-
-  // Add sections containing exported symbols
-  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
-    for (Symbol<E> *sym : file->symbols)
-      if (sym->file == file && sym->is_exported)
-        enqueue_symbol(sym);
-  });
-
-  // Add sections referenced by root symbols.
-  enqueue_symbol(get_symbol(ctx, ctx.arg.entry));
-
-  for (std::string_view name : ctx.arg.undefined)
-    enqueue_symbol(get_symbol(ctx, name));
-
-  for (std::string_view name : ctx.arg.require_defined)
-    enqueue_symbol(get_symbol(ctx, name));
-
-  // .eh_frame consists of variable-length records called CIE and FDE
-  // records, and they are a unit of inclusion or exclusion.
-  // We just keep all CIEs and everything that are referenced by them.
-  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
-    for (CieRecord<E> &cie : file->cies)
-      for (const ElfRel<E> &rel : cie.get_rels())
-        enqueue_symbol(file->symbols[rel.r_sym]);
-  });
-}
-
-// Mark all reachable sections
-template <typename E>
-static void mark(Context<E> &ctx,
-                 tbb::concurrent_vector<InputSection<E> *> &rootset) {
-  Timer t(ctx, "mark");
-
-  tbb::parallel_for_each(rootset, [&](InputSection<E> *isec,
-                                    tbb::feeder<InputSection<E> *> &feeder) {
-    visit(ctx, isec, feeder, 0);
-  });
-}
-
-// Remove unreachable sections
-template <typename E>
-static void sweep(Context<E> &ctx) {
-  Timer t(ctx, "sweep");
-  static Counter counter("garbage_sections");
-
-  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
-    for (std::unique_ptr<InputSection<E>> &isec : file->sections) {
-      if (isec && isec->is_alive && !isec->is_visited) {
-        if (ctx.arg.print_gc_sections)
-          SyncOut(ctx) << "removing unused section " << *isec;
-        isec->kill();
-        counter++;
-      }
-    }
-  });
-}
-
-// Non-alloc section fragments are not subject of garbage collection.
-// This function marks such fragments.
-template <typename E>
-static void mark_nonalloc_fragments(Context<E> &ctx) {
-  Timer t(ctx, "mark_nonalloc_fragments");
-
-  tbb::parallel_for_each(ctx.objs, [](ObjectFile<E> *file) {
-    for (std::unique_ptr<MergeableSection<E>> &m : file->mergeable_sections)
-      if (m)
-        for (SectionFragment<E> *frag : m->fragments)
-          if (!(frag->output_section.shdr.sh_flags & SHF_ALLOC))
-            frag->is_alive.store(true, std::memory_order_relaxed);
-  });
-}
-
-template <typename E>
-void gc_sections(Context<E> &ctx) {
-  Timer t(ctx, "gc");
-
-  mark_nonalloc_fragments(ctx);
-
-  tbb::concurrent_vector<InputSection<E> *> rootset;
-  collect_root_set(ctx, rootset);
-  mark(ctx, rootset);
-  sweep(ctx);
-}
-
-#define INSTANTIATE(E)                                  \
-  template void gc_sections(Context<E> &ctx);
-
-INSTANTIATE_ALL;
-
-} // namespace mold::elf

elf/input-sections.cc

@@ -1,308 +0,0 @@
-#include "mold.h"
-
-#include <limits>
-#include <zlib.h>
-
-namespace mold::elf {
-
-template <typename E>
-bool CieRecord<E>::equals(const CieRecord<E> &other) const {
-  if (get_contents() != other.get_contents())
-    return false;
-
-  std::span<const ElfRel<E>> x = get_rels();
-  std::span<const ElfRel<E>> y = other.get_rels();
-  if (x.size() != y.size())
-    return false;
-
-  for (i64 i = 0; i < x.size(); i++) {
-    if (x[i].r_offset - input_offset != y[i].r_offset - other.input_offset ||
-        x[i].r_type != y[i].r_type ||
-        file.symbols[x[i].r_sym] != other.file.symbols[y[i].r_sym] ||
-        input_section.get_addend(x[i]) != other.input_section.get_addend(y[i]))
-      return false;
-  }
-  return true;
-}
-
-static inline i64 to_p2align(u64 alignment) {
-  if (alignment == 0)
-    return 0;
-  return std::countr_zero(alignment);
-}
-
-template <typename E>
-InputSection<E>::InputSection(Context<E> &ctx, ObjectFile<E> &file,
-                              std::string_view name, i64 shndx)
-  : file(file), shndx(shndx) {
-  if (shndx < file.elf_sections.size())
-    contents = {(char *)file.mf->data + shdr().sh_offset, (size_t)shdr().sh_size};
-
-  if (name.starts_with(".zdebug")) {
-    sh_size = *(ub64 *)&contents[4];
-    p2align = to_p2align(shdr().sh_addralign);
-    compressed = true;
-  } else if (shdr().sh_flags & SHF_COMPRESSED) {
-    ElfChdr<E> &chdr = *(ElfChdr<E> *)&contents[0];
-    sh_size = chdr.ch_size;
-    p2align = to_p2align(chdr.ch_addralign);
-    compressed = true;
-  } else {
-    sh_size = shdr().sh_size;
-    p2align = to_p2align(shdr().sh_addralign);
-    compressed = false;
-  }
-
-  // Sections may have been compressed. We usually uncompress them
-  // directly into the mmap'ed output file, but we want to uncompress
-  // early for REL-type ELF types to read relocation addends from
-  // section contents. For RELA-type, we don't need to do this because
-  // addends are in relocations.
-  if (E::is_rel)
-    uncompress(ctx);
-
-  output_section =
-    OutputSection<E>::get_instance(ctx, name, shdr().sh_type, shdr().sh_flags);
-}
-
-template <typename E>
-void InputSection<E>::uncompress(Context<E> &ctx) {
-  if (!compressed || uncompressed)
-    return;
-
-  u8 *buf = new u8[sh_size];
-  uncompress_to(ctx, buf);
-  contents = {(char *)buf, sh_size};
-  ctx.string_pool.emplace_back(buf);
-  uncompressed = true;
-}
-
-template <typename E>
-void InputSection<E>::uncompress_to(Context<E> &ctx, u8 *buf) {
-  if (!compressed || uncompressed) {
-    memcpy(buf, contents.data(), contents.size());
-    return;
-  }
-
-  auto do_uncompress = [&](std::string_view data) {
-    unsigned long size = sh_size;
-    if (::uncompress(buf, &size, (u8 *)data.data(), data.size()) != Z_OK)
-      Fatal(ctx) << *this << ": uncompress failed";
-    assert(size == sh_size);
-  };
-
-  if (name().starts_with(".zdebug")) {
-    // Old-style compressed section
-    if (!contents.starts_with("ZLIB") || contents.size() <= 12)
-      Fatal(ctx) << *this << ": corrupted compressed section";
-    do_uncompress(contents.substr(12));
-    return;
-  }
-
-  assert(shdr().sh_flags & SHF_COMPRESSED);
-
-  // New-style compressed section
-  if (contents.size() < sizeof(ElfChdr<E>))
-    Fatal(ctx) << *this << ": corrupted compressed section";
-
-  ElfChdr<E> &hdr = *(ElfChdr<E> *)&contents[0];
-  if (hdr.ch_type != ELFCOMPRESS_ZLIB)
-    Fatal(ctx) << *this << ": unsupported compression type: 0x"
-               << std::hex << hdr.ch_type;
-  do_uncompress(contents.substr(sizeof(ElfChdr<E>)));
-}
-
-template <typename E>
-static i64 get_output_type(Context<E> &ctx) {
-  if (ctx.arg.shared)
-    return 0;
-  if (ctx.arg.pie)
-    return 1;
-  return 2;
-}
-
-template <typename E>
-static i64 get_sym_type(Symbol<E> &sym) {
-  if (sym.is_absolute())
-    return 0;
-  if (!sym.is_imported)
-    return 1;
-  if (sym.get_type() != STT_FUNC)
-    return 2;
-  return 3;
-}
-
-template <typename E>
-void InputSection<E>::dispatch(Context<E> &ctx, Action table[3][4], i64 i,
-                               const ElfRel<E> &rel, Symbol<E> &sym) {
-  Action action = table[get_output_type(ctx)][get_sym_type(sym)];
-  bool is_writable = (shdr().sh_flags & SHF_WRITE);
-
-  auto error = [&] {
-    std::string msg = sym.is_absolute() ? "-fno-PIC" : "-fPIC";
-    Error(ctx) << *this << ": " << rel << " relocation at offset 0x"
-               << std::hex << rel.r_offset << " against symbol `"
-               << sym << "' can not be used; recompile with " << msg;
-  };
-
-  auto warn_textrel = [&] {
-    if (ctx.arg.warn_textrel)
-      Warn(ctx) << *this << ": relocation against symbol `" << sym
-                << "' in read-only section";
-  };
-
-  switch (action) {
-  case NONE:
-    return;
-  case ERROR:
-    error();
-    return;
-  case COPYREL:
-    if (!ctx.arg.z_copyreloc) {
-      error();
-      return;
-    }
-
-    if (sym.esym().st_visibility == STV_PROTECTED) {
-      Error(ctx) << *this
-                 << ": cannot make copy relocation for protected symbol '"
-                 << sym << "', defined in " << *sym.file
-                 << "; recompile with -fPIC";
-      return;
-    }
-
-    sym.flags |= NEEDS_COPYREL;
-    return;
-  case PLT:
-    sym.flags |= NEEDS_PLT;
-    return;
-  case CPLT:
-    sym.flags |= NEEDS_CPLT;
-    return;
-  case DYNREL:
-    if (!is_writable) {
-      if (ctx.arg.z_text) {
-        error();
-        return;
-      }
-      warn_textrel();
-      ctx.has_textrel = true;
-    }
-
-    assert(sym.is_imported);
-    file.num_dynrel++;
-    return;
-  case BASEREL:
-    if (!is_writable) {
-      if (ctx.arg.z_text) {
-        error();
-        return;
-      }
-      warn_textrel();
-      ctx.has_textrel = true;
-    }
-
-    if (!is_relr_reloc(ctx, rel))
-      file.num_dynrel++;
-    return;
-  default:
-    unreachable();
-  }
-}
-
-template <typename E>
-void InputSection<E>::write_to(Context<E> &ctx, u8 *buf) {
-  if (shdr().sh_type == SHT_NOBITS || sh_size == 0)
-    return;
-
-  // Copy data
-  if constexpr (std::is_same_v<E, RISCV64> || std::is_same_v<E, RISCV32>) {
-    copy_contents_riscv(ctx, buf);
-  } else if (compressed) {
-    uncompress_to(ctx, buf);
-  } else {
-    memcpy(buf, contents.data(), contents.size());
-  }
-
-  // Apply relocations
-  if (shdr().sh_flags & SHF_ALLOC)
-    apply_reloc_alloc(ctx, buf);
-  else
-    apply_reloc_nonalloc(ctx, buf);
-}
-
-// Get the name of a function containin a given offset.
-template <typename E>
-std::string_view InputSection<E>::get_func_name(Context<E> &ctx, i64 offset) {
-  for (const ElfSym<E> &esym : file.elf_syms) {
-    if (esym.st_shndx == shndx && esym.st_type == STT_FUNC &&
-        esym.st_value <= offset && offset < esym.st_value + esym.st_size) {
-      std::string_view name = file.symbol_strtab.data() + esym.st_name;
-      if (ctx.arg.demangle)
-        return demangle(name);
-      return name;
-    }
-  }
-  return "";
-}
-
-// Record an undefined symbol error which will be displayed all at
-// once by report_undef_errors().
-template <typename E>
-void InputSection<E>::record_undef_error(Context<E> &ctx, const ElfRel<E> &rel) {
-  std::stringstream ss;
-  if (std::string_view source = file.get_source_name(); !source.empty())
-    ss << ">>> referenced by " << source << "\n";
-  else
-    ss << ">>> referenced by " << *this << "\n";
-
-  ss << ">>>               " << file;
-  if (std::string_view func = get_func_name(ctx, rel.r_offset); !func.empty())
-    ss << ":(" << func << ")";
-
-  Symbol<E> &sym = *file.symbols[rel.r_sym];
-
-  typename decltype(ctx.undef_errors)::accessor acc;
-  ctx.undef_errors.insert(acc, {sym.name(), {}});
-  acc->second.push_back(ss.str());
-}
-
-// Report all undefined symbols, grouped by symbol.
-template <typename E>
-void report_undef_errors(Context<E> &ctx) {
-  constexpr i64 max_errors = 3;
-
-  for (auto &pair : ctx.undef_errors) {
-    std::string_view sym_name = pair.first;
-    std::span<std::string> errors = pair.second;
-
-    if (ctx.arg.demangle)
-      sym_name = demangle(sym_name);
-
-    std::stringstream ss;
-    ss << "undefined symbol: " << sym_name << "\n";
-
-    for (i64 i = 0; i < errors.size() && i < max_errors; i++)
-      ss << errors[i];
-
-    if (errors.size() > max_errors)
-      ss << ">>> referenced " << (errors.size() - max_errors) << " more times\n";
-
-    if (ctx.arg.unresolved_symbols == UNRESOLVED_ERROR)
-      Error(ctx) << ss.str();
-    else if (ctx.arg.unresolved_symbols == UNRESOLVED_WARN)
-      Warn(ctx) << ss.str();
-  }
-
-  ctx.checkpoint();
-}
-
-#define INSTANTIATE(E)                                                  \
-  template struct CieRecord<E>;                                         \
-  template class InputSection<E>;                                       \
-  template void report_undef_errors(Context<E> &)
-
-
-INSTANTIATE_ALL;
-
-} // namespace mold::elf

elf/linker-script.cc

@@ -1,418 +0,0 @@
-// On Linux, /usr/lib/x86_64-linux-gnu/libc.so is not actually
-// a shared object file but an ASCII text file containing a linker
-// script to include a "real" libc.so file. Therefore, we need to
-// support a (very limited) subset of the linker script language.
-
-#include "mold.h"
-
-#include <cctype>
-#include <iomanip>
-
-namespace mold::elf {
-
-template <typename E>
-static thread_local MappedFile<Context<E>> *current_file;
-
-template <typename E>
-void read_version_script(Context<E> &ctx, std::span<std::string_view> &tok);
-
-static std::string_view get_line(std::string_view input, const char *pos) {
-  assert(input.data() <= pos);
-  assert(pos < input.data() + input.size());
-
-  i64 start = input.rfind('\n', pos - input.data());
-  if (start == input.npos)
-    start = 0;
-  else
-    start++;
-
-  i64 end = input.find('\n', pos - input.data());
-  if (end == input.npos)
-    end = input.size();
-
-  return input.substr(start, end - start);
-}
-
-template <typename E>
-class SyntaxError {
-public:
-  SyntaxError(Context<E> &ctx, std::string_view errpos) : out(ctx) {
-    std::string_view contents = current_file<E>->get_contents();
-    std::string_view line = get_line(contents, errpos.data());
-
-    i64 lineno = 1;
-    for (i64 i = 0; contents.data() + i < line.data(); i++)
-      if (contents[i] == '\n')
-        lineno++;
-
-    i64 column = errpos.data() - line.data();
-
-    std::stringstream ss;
-    ss << current_file<E>->name << ":" << lineno << ": ";
-    i64 indent = (i64)ss.tellp() + strlen("mold: ");
-    ss << line << "\n" << std::setw(indent + column) << " " << "^ ";
-    out << ss.str();
-  }
-
-  template <class T> SyntaxError &operator<<(T &&val) {
-    out << std::forward<T>(val);
-    return *this;
-  }
-
-  [[noreturn]] ~SyntaxError() = default;
-
-  Fatal<Context<E>> out;
-};
-
-template <typename E>
-static std::vector<std::string_view>
-tokenize(Context<E> &ctx, std::string_view input) {
-  std::vector<std::string_view> vec;
-  while (!input.empty()) {
-    if (isspace(input[0])) {
-      input = input.substr(1);
-      continue;
-    }
-
-    if (input.starts_with("/*")) {
-      i64 pos = input.find("*/", 2);
-      if (pos == std::string_view::npos)
-        SyntaxError(ctx, input) << "unclosed comment";
-      input = input.substr(pos + 2);
-      continue;
-    }
-
-    if (input[0] == '#') {
-      i64 pos = input.find("\n", 1);
-      if (pos == std::string_view::npos)
-        break;
-      input = input.substr(pos + 1);
-      continue;
-    }
-
-    if (input[0] == '"') {
-      i64 pos = input.find('"', 1);
-      if (pos == std::string_view::npos)
-        SyntaxError(ctx, input) << "unclosed string literal";
-      vec.push_back(input.substr(0, pos + 1));
-      input = input.substr(pos + 1);
-      continue;
-    }
-
-    i64 pos = input.find_first_not_of(
-      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
-      "0123456789_.$/\\~=+[]*?-!^:");
-
-    if (pos == 0)
-      pos = 1;
-    else if (pos == input.npos)
-      pos = input.size();
-
-    vec.push_back(input.substr(0, pos));
-    input = input.substr(pos);
-  }
-  return vec;
-}
-
-template <typename E>
-static std::span<std::string_view>
-skip(Context<E> &ctx, std::span<std::string_view> tok, std::string_view str) {
-  if (tok.empty())
-    Fatal(ctx) << current_file<E>->name << ": expected '" << str
-               << "', but got EOF";
-  if (tok[0] != str)
-    SyntaxError(ctx, tok[0]) << "expected '" << str << "'";
-  return tok.subspan(1);
-}
-
-static std::string_view unquote(std::string_view s) {
-  if (s.size() > 0 && s[0] == '"') {
-    assert(s[s.size() - 1] == '"');
-    return s.substr(1, s.size() - 2);
-  }
-  return s;
-}
-
-template <typename E>
-static std::span<std::string_view>
-read_output_format(Context<E> &ctx, std::span<std::string_view> tok) {
-  tok = skip(ctx, tok, "(");
-  while (!tok.empty() && tok[0] != ")")
-    tok = tok.subspan(1);
-  if (tok.empty())
-    Fatal(ctx) << current_file<E>->name << ": expected ')', but got EOF";
-  return tok.subspan(1);
-}
-
-template <typename E>
-static bool is_in_sysroot(Context<E> &ctx, std::string path) {
-  std::string rel = to_abs_path(path)
-                        .lexically_relative(to_abs_path(ctx.arg.sysroot))
-                        .string();
-  return rel != "." && !rel.starts_with("../");
-}
-
-template <typename E>
-static MappedFile<Context<E>> *resolve_path(Context<E> &ctx, std::string_view tok) {
-  std::string str(unquote(tok));
-
-  // GNU ld prepends the sysroot if a pathname starts with '/' and the
-  // script being processed is in the sysroot. We do the same.
-  if (str.starts_with('/') && is_in_sysroot(ctx, current_file<E>->name))
-    return MappedFile<Context<E>>::must_open(ctx, ctx.arg.sysroot + str);
-
-  if (str.starts_with('=')) {
-    std::string path;
-    if (ctx.arg.sysroot.empty())
-      path = str.substr(1);
-    else
-      path = ctx.arg.sysroot + str.substr(1);
-    return MappedFile<Context<E>>::must_open(ctx, path);
-  }
-
-  if (str.starts_with("-l"))
-    return find_library(ctx, str.substr(2));
-
-  if (MappedFile<Context<E>> *mf = open_library(ctx, str))
-    return mf;
-
-  for (std::string_view dir : ctx.arg.library_paths) {
-    std::string path = std::string(dir) + "/" + str;
-    if (MappedFile<Context<E>> *mf = open_library(ctx, path))
-      return mf;
-  }
-
-  SyntaxError(ctx, tok) << "library not found: " << str;
-}
-
-template <typename E>
-static std::span<std::string_view>
-read_group(Context<E> &ctx, std::span<std::string_view> tok) {
-  tok = skip(ctx, tok, "(");
-
-  while (!tok.empty() && tok[0] != ")") {
-    if (tok[0] == "AS_NEEDED") {
-      bool orig = ctx.as_needed;
-      ctx.as_needed = true;
-      tok = read_group(ctx, tok.subspan(1));
-      ctx.as_needed = orig;
-      continue;
-    }
-
-    MappedFile<Context<E>> *mf = resolve_path(ctx, tok[0]);
-    read_file(ctx, mf);
-    tok = tok.subspan(1);
-  }
-
-  if (tok.empty())
-    Fatal(ctx) << current_file<E>->name << ": expected ')', but got EOF";
-  return tok.subspan(1);
-}
-
-template <typename E>
-void parse_linker_script(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  current_file<E> = mf;
-
-  std::vector<std::string_view> vec = tokenize(ctx, mf->get_contents());
-  std::span<std::string_view> tok = vec;
-
-  while (!tok.empty()) {
-    if (tok[0] == "OUTPUT_FORMAT") {
-      tok = read_output_format(ctx, tok.subspan(1));
-    } else if (tok[0] == "INPUT" || tok[0] == "GROUP") {
-      tok = read_group(ctx, tok.subspan(1));
-    } else if (tok[0] == "VERSION") {
-      tok = tok.subspan(1);
-      tok = skip(ctx, tok, "{");
-      read_version_script(ctx, tok);
-      tok = skip(ctx, tok, "}");
-    } else if (tok.size() > 3 && tok[1] == "=" && tok[3] == ";") {
-      ctx.arg.defsyms.emplace_back(get_symbol(ctx, unquote(tok[0])),
-                                   get_symbol(ctx, unquote(tok[2])));
-      tok = tok.subspan(4);
-    } else if (tok[0] == ";") {
-      tok = tok.subspan(1);
-    } else {
-      SyntaxError(ctx, tok[0]) << "unknown linker script token";
-    }
-  }
-}
-
-template <typename E>
-MachineType get_script_output_type(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  current_file<E> = mf;
-
-  std::vector<std::string_view> vec = tokenize(ctx, mf->get_contents());
-  std::span<std::string_view> tok = vec;
-
-  if (tok.size() >= 3 && tok[0] == "OUTPUT_FORMAT" && tok[1] == "(") {
-    if (tok[2] == "elf64-x86-64")
-      return MachineType::X86_64;
-    if (tok[2] == "elf32-i386")
-      return MachineType::I386;
-  }
-  return MachineType::NONE;
-}
-
-static bool read_label(std::span<std::string_view> &tok,
-                       std::string label) {
-  if (tok.size() >= 1 && tok[0] == label + ":") {
-    tok = tok.subspan(1);
-    return true;
-  }
-
-  if (tok.size() >= 2 && tok[0] == label && tok[1] == ":") {
-    tok = tok.subspan(2);
-    return true;
-  }
-  return false;
-}
-
-template <typename E>
-static void
-read_version_script_commands(Context<E> &ctx, std::span<std::string_view> &tok,
-                             u16 ver_idx, bool is_cpp) {
-  ctx.version_specified = true;
-  bool is_global = true;
-
-  while (!tok.empty() && tok[0] != "}") {
-    if (read_label(tok, "global")) {
-      is_global = true;
-      continue;
-    }
-
-    if (read_label(tok, "local")) {
-      is_global = false;
-      continue;
-    }
-
-    if (tok[0] == "extern") {
-      tok = tok.subspan(1);
-
-      if (!tok.empty() && tok[0] == "\"C\"") {
-        tok = tok.subspan(1);
-        tok = skip(ctx, tok, "{");
-        read_version_script_commands( ctx, tok, ver_idx, false);
-      } else {
-        tok = skip(ctx, tok, "\"C++\"");
-        tok = skip(ctx, tok, "{");
-        read_version_script_commands(ctx, tok, ver_idx, true);
-      }
-
-      tok = skip(ctx, tok, "}");
-      tok = skip(ctx, tok, ";");
-      continue;
-    }
-
-    if (tok[0] == "*") {
-      ctx.default_version = (is_global ? ver_idx : VER_NDX_LOCAL);
-    } else if (is_global) {
-      ctx.version_patterns.push_back({unquote(tok[0]), ver_idx, is_cpp});
-    } else {
-      ctx.version_patterns.push_back({unquote(tok[0]), VER_NDX_LOCAL, is_cpp});
-    }
-
-    tok = tok.subspan(1);
-
-    if (!tok.empty() && tok[0] == "}")
-      return;
-    tok = skip(ctx, tok, ";");
-  }
-}
-
-template <typename E>
-void read_version_script(Context<E> &ctx, std::span<std::string_view> &tok) {
-  u16 next_ver = VER_NDX_LAST_RESERVED + ctx.arg.version_definitions.size() + 1;
-
-  while (!tok.empty() && tok[0] != "}") {
-    u16 ver_idx;
-    if (tok[0] == "{") {
-      ver_idx = VER_NDX_GLOBAL;
-    } else {
-      ver_idx = next_ver++;
-      ctx.arg.version_definitions.push_back(std::string(tok[0]));
-      tok = tok.subspan(1);
-    }
-
-    tok = skip(ctx, tok, "{");
-    read_version_script_commands(ctx, tok, ver_idx, false);
-    tok = skip(ctx, tok, "}");
-    if (!tok.empty() && tok[0] != ";")
-      tok = tok.subspan(1);
-    tok = skip(ctx, tok, ";");
-  }
-}
-
-template <typename E>
-void parse_version_script(Context<E> &ctx, std::string path) {
-  current_file<E> = MappedFile<Context<E>>::must_open(ctx, path);
-  std::vector<std::string_view> vec =
-    tokenize(ctx, current_file<E>->get_contents());
-  std::span<std::string_view> tok = vec;
-  read_version_script(ctx, tok);
-  if (!tok.empty())
-    SyntaxError(ctx, tok[0]) << "trailing garbage token";
-}
-
-template <typename E>
-void read_dynamic_list_commands(Context<E> &ctx, std::span<std::string_view> &tok,
-                                bool is_cpp) {
-  ctx.version_specified = true;
-
-  while (!tok.empty() && tok[0] != "}") {
-    if (tok[0] == "extern") {
-      tok = tok.subspan(1);
-
-      if (!tok.empty() && tok[0] == "\"C\"") {
-        tok = tok.subspan(1);
-        tok = skip(ctx, tok, "{");
-        read_dynamic_list_commands(ctx, tok, false);
-      } else {
-        tok = skip(ctx, tok, "\"C++\"");
-        tok = skip(ctx, tok, "{");
-        read_dynamic_list_commands(ctx, tok, true);
-      }
-
-      tok = skip(ctx, tok, "}");
-      tok = skip(ctx, tok, ";");
-      continue;
-    }
-
-    if (tok[0] == "*")
-      ctx.default_version = VER_NDX_GLOBAL;
-    else
-      ctx.version_patterns.push_back({unquote(tok[0]), VER_NDX_GLOBAL, is_cpp});
-
-    tok = skip(ctx, tok.subspan(1), ";");
-  }
-}
-
-template <typename E>
-void parse_dynamic_list(Context<E> &ctx, std::string path) {
-  current_file<E> = MappedFile<Context<E>>::must_open(ctx, path);
-  std::vector<std::string_view> vec =
-    tokenize(ctx, current_file<E>->get_contents());
-
-  std::span<std::string_view> tok = vec;
-  tok = skip(ctx, tok, "{");
-  read_dynamic_list_commands(ctx, tok, false);
-  tok = skip(ctx, tok, "}");
-  tok = skip(ctx, tok, ";");
-
-  if (!tok.empty())
-    SyntaxError(ctx, tok[0]) << "trailing garbage token";
-}
-
-#define INSTANTIATE(E)                                                          \
-  template                                                                      \
-  void parse_linker_script(Context<E> &, MappedFile<Context<E>> *);             \
-  template                                                                      \
-  MachineType get_script_output_type(Context<E> &, MappedFile<Context<E>> *);   \
-  template                                                                      \
-  void parse_version_script(Context<E> &, std::string);                         \
-  template                                                                      \
-  void parse_dynamic_list(Context<E> &, std::string);
-
-INSTANTIATE_ALL;
-
-} // namespace mold::elf

elf/lto-win32.cc

@@ -1,31 +0,0 @@
-#ifdef _WIN32
-
-#include "mold.h"
-#include "lto.h"
-
-namespace mold::elf {
-
-template <typename E>
-ObjectFile<E> *read_lto_object(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  Fatal(ctx) << "LTO is not supported on Windows";
-}
-
-template <typename E>
-std::vector<ObjectFile<E> *> do_lto(Context<E> &ctx) {
-  return {};
-}
-
-template <typename E>
-void lto_cleanup(Context<E> &ctx) {}
-
-#define INSTANTIATE(E)                                                  \
-  template ObjectFile<E> *                                              \
-    read_lto_object(Context<E> &, MappedFile<Context<E>> *);            \
-  template std::vector<ObjectFile<E> *> do_lto(Context<E> &);           \
-  template void lto_cleanup(Context<E> &)
-
-INSTANTIATE_ALL;
-
-} // namespace mold::elf
-
-#endif

elf/main.cc

@@ -1,745 +0,0 @@
-#include "mold.h"
-#include "../archive-file.h"
-#include "../cmdline.h"
-#include "../output-file.h"
-
-#include <cstring>
-#include <functional>
-#include <iomanip>
-#include <map>
-#include <signal.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <tbb/global_control.h>
-#include <tbb/parallel_for_each.h>
-#include <unordered_set>
-
-#ifdef _WIN32
-# include <direct.h>
-# define _chdir chdir
-#else
-# include <unistd.h>
-#endif
-
-namespace mold::elf {
-
-// Read the beginning of a given file and returns its machine type
-// (e.g. EM_X86_64 or EM_386).
-template <typename E>
-static MachineType get_machine_type(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  auto get_elf_type = [](u8 *buf) {
-    switch (ElfEhdr<E> &ehdr = *(ElfEhdr<E> *)buf; ehdr.e_machine) {
-    case EM_386:
-      return MachineType::I386;
-    case EM_X86_64:
-      return MachineType::X86_64;
-    case EM_ARM:
-      return MachineType::ARM32;
-    case EM_AARCH64:
-      return MachineType::ARM64;
-    case EM_RISCV:
-      return (ehdr.e_ident[EI_CLASS] == ELFCLASS64)
-        ? MachineType::RISCV64 : MachineType::RISCV32;
-    default:
-      return MachineType::NONE;
-    }
-  };
-
-  switch (get_file_type(mf)) {
-  case FileType::ELF_OBJ:
-  case FileType::ELF_DSO:
-  case FileType::GCC_LTO_OBJ:
-    return get_elf_type(mf->data);
-  case FileType::AR:
-    for (MappedFile<Context<E>> *child : read_fat_archive_members(ctx, mf))
-      if (get_file_type(child) == FileType::ELF_OBJ)
-        return get_elf_type(child->data);
-    return MachineType::NONE;
-  case FileType::THIN_AR:
-    for (MappedFile<Context<E>> *child : read_thin_archive_members(ctx, mf))
-      if (get_file_type(child) == FileType::ELF_OBJ)
-        return get_elf_type(child->data);
-    return MachineType::NONE;
-  case FileType::TEXT:
-    return get_script_output_type(ctx, mf);
-  default:
-    return MachineType::NONE;
-  }
-}
-
-template <typename E>
-static ObjectFile<E> *new_object_file(Context<E> &ctx, MappedFile<Context<E>> *mf,
-                                      std::string archive_name) {
-  if (get_machine_type(ctx, mf) != ctx.arg.emulation)
-    Fatal(ctx) << mf->name << ": incompatible file type";
-
-  static Counter count("parsed_objs");
-  count++;
-
-  bool in_lib = ctx.in_lib || (!archive_name.empty() && !ctx.whole_archive);
-  ObjectFile<E> *file = ObjectFile<E>::create(ctx, mf, archive_name, in_lib);
-  file->priority = ctx.file_priority++;
-  ctx.tg.run([file, &ctx] { file->parse(ctx); });
-  if (ctx.arg.trace)
-    SyncOut(ctx) << "trace: " << *file;
-  return file;
-}
-
-template <typename E>
-static ObjectFile<E> *new_lto_obj(Context<E> &ctx, MappedFile<Context<E>> *mf,
-                                  std::string archive_name) {
-  static Counter count("parsed_lto_objs");
-  count++;
-
-  if (ctx.arg.ignore_ir_file.count(mf->get_identifier()))
-    return nullptr;
-
-  ObjectFile<E> *file = read_lto_object(ctx, mf);
-  file->priority = ctx.file_priority++;
-  file->archive_name = archive_name;
-  file->is_in_lib = ctx.in_lib || (!archive_name.empty() && !ctx.whole_archive);
-  file->is_alive = !file->is_in_lib;
-  ctx.has_lto_object = true;
-  if (ctx.arg.trace)
-    SyncOut(ctx) << "trace: " << *file;
-  return file;
-}
-
-template <typename E>
-static SharedFile<E> *
-new_shared_file(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  if (get_machine_type(ctx, mf) != ctx.arg.emulation)
-    Fatal(ctx) << mf->name << ": incompatible file type";
-
-  SharedFile<E> *file = SharedFile<E>::create(ctx, mf);
-  file->priority = ctx.file_priority++;
-  ctx.tg.run([file, &ctx] { file->parse(ctx); });
-  if (ctx.arg.trace)
-    SyncOut(ctx) << "trace: " << *file;
-  return file;
-}
-
-template <typename E>
-void read_file(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  if (ctx.visited.contains(mf->name))
-    return;
-
-  FileType type = get_file_type(mf);
-  switch (type) {
-  case FileType::ELF_OBJ:
-    ctx.objs.push_back(new_object_file(ctx, mf, ""));
-    return;
-  case FileType::ELF_DSO:
-    ctx.dsos.push_back(new_shared_file(ctx, mf));
-    ctx.visited.insert(mf->name);
-    return;
-  case FileType::AR:
-  case FileType::THIN_AR:
-    for (MappedFile<Context<E>> *child : read_archive_members(ctx, mf)) {
-      switch (get_file_type(child)) {
-      case FileType::ELF_OBJ:
-        ctx.objs.push_back(new_object_file(ctx, child, mf->name));
-        break;
-      case FileType::GCC_LTO_OBJ:
-      case FileType::LLVM_BITCODE:
-        if (ObjectFile<E> *file = new_lto_obj(ctx, child, mf->name))
-          ctx.objs.push_back(file);
-        break;
-      default:
-        break;
-      }
-    }
-    ctx.visited.insert(mf->name);
-    return;
-  case FileType::TEXT:
-    parse_linker_script(ctx, mf);
-    return;
-  case FileType::GCC_LTO_OBJ:
-  case FileType::LLVM_BITCODE:
-    if (ObjectFile<E> *file = new_lto_obj(ctx, mf, ""))
-      ctx.objs.push_back(file);
-    return;
-  default:
-    Fatal(ctx) << mf->name << ": unknown file type";
-  }
-}
-
-template <typename E>
-static MachineType
-deduce_machine_type(Context<E> &ctx, std::span<std::string> args) {
-  for (std::string_view arg : args)
-    if (!arg.starts_with('-'))
-      if (auto *mf = MappedFile<Context<E>>::open(ctx, std::string(arg)))
-        if (MachineType ty = get_machine_type(ctx, mf); ty != MachineType::NONE)
-          return ty;
-  Fatal(ctx) << "-m option is missing";
-}
-
-template <typename E>
-MappedFile<Context<E>> *open_library(Context<E> &ctx, std::string path) {
-  MappedFile<Context<E>> *mf = MappedFile<Context<E>>::open(ctx, path);
-  if (!mf)
-    return nullptr;
-
-  MachineType ty = get_machine_type(ctx, mf);
-  if (ty == MachineType::NONE || ty == E::machine_type)
-    return mf;
-  Warn(ctx) << path << ": skipping incompatible file " << (int)ty
-            << " " << (int)E::e_machine;
-  return nullptr;
-}
-
-template <typename E>
-MappedFile<Context<E>> *find_library(Context<E> &ctx, std::string name) {
-  if (name.starts_with(':')) {
-    for (std::string_view dir : ctx.arg.library_paths) {
-      std::string path = std::string(dir) + "/" + name.substr(1);
-      if (MappedFile<Context<E>> *mf = open_library(ctx, path))
-        return mf;
-    }
-    Fatal(ctx) << "library not found: " << name;
-  }
-
-  for (std::string_view dir : ctx.arg.library_paths) {
-    std::string stem = std::string(dir) + "/lib" + name;
-    if (!ctx.is_static)
-      if (MappedFile<Context<E>> *mf = open_library(ctx, stem + ".so"))
-        return mf;
-    if (MappedFile<Context<E>> *mf = open_library(ctx, stem + ".a"))
-      return mf;
-  }
-  Fatal(ctx) << "library not found: " << name;
-}
-
-template <typename E>
-static void read_input_files(Context<E> &ctx, std::span<std::string> args) {
-  Timer t(ctx, "read_input_files");
-
-  std::vector<std::tuple<bool, bool, bool, bool>> state;
-  ctx.is_static = ctx.arg.is_static;
-
-  while (!args.empty()) {
-    std::string_view arg = args[0];
-    args = args.subspan(1);
-
-    if (arg == "--as-needed") {
-      ctx.as_needed = true;
-    } else if (arg == "--no-as-needed") {
-      ctx.as_needed = false;
-    } else if (arg == "--whole-archive") {
-      ctx.whole_archive = true;
-    } else if (arg == "--no-whole-archive") {
-      ctx.whole_archive = false;
-    } else if (arg == "--Bstatic") {
-      ctx.is_static = true;
-    } else if (arg == "--Bdynamic") {
-      ctx.is_static = false;
-    } else if (arg == "--start-lib") {
-      ctx.in_lib = true;
-    } else if (arg == "--end-lib") {
-      ctx.in_lib = false;
-    } else if (remove_prefix(arg, "--version-script=")) {
-      parse_version_script(ctx, std::string(arg));
-    } else if (remove_prefix(arg, "--dynamic-list=")) {
-      parse_dynamic_list(ctx, std::string(arg));
-    } else if (remove_prefix(arg, "--export-dynamic-symbol=")) {
-      if (arg == "*")
-        ctx.default_version = VER_NDX_GLOBAL;
-      else
-        ctx.version_patterns.push_back({arg, VER_NDX_GLOBAL, false});
-      ctx.version_specified = true;
-    } else if (remove_prefix(arg, "--export-dynamic-symbol-list=")) {
-      parse_dynamic_list(ctx, std::string(arg));
-    } else if (arg == "--push-state") {
-      state.push_back({ctx.as_needed, ctx.whole_archive, ctx.is_static,
-                       ctx.in_lib});
-    } else if (arg == "--pop-state") {
-      if (state.empty())
-        Fatal(ctx) << "no state pushed before popping";
-      std::tie(ctx.as_needed, ctx.whole_archive, ctx.is_static, ctx.in_lib) =
-        state.back();
-      state.pop_back();
-    } else if (remove_prefix(arg, "-l")) {
-      MappedFile<Context<E>> *mf = find_library(ctx, std::string(arg));
-      mf->given_fullpath = false;
-      read_file(ctx, mf);
-    } else {
-      read_file(ctx, MappedFile<Context<E>>::must_open(ctx, std::string(arg)));
-    }
-  }
-
-  if (ctx.objs.empty())
-    Fatal(ctx) << "no input files";
-
-  ctx.tg.wait();
-}
-
-template <typename E>
-static void show_stats(Context<E> &ctx) {
-  for (ObjectFile<E> *obj : ctx.objs) {
-    static Counter defined("defined_syms");
-    defined += obj->first_global - 1;
-
-    static Counter undefined("undefined_syms");
-    undefined += obj->symbols.size() - obj->first_global;
-
-    for (std::unique_ptr<InputSection<E>> &sec : obj->sections) {
-      if (!sec || !sec->is_alive)
-        continue;
-
-      static Counter alloc("reloc_alloc");
-      static Counter nonalloc("reloc_nonalloc");
-
-      if (sec->shdr().sh_flags & SHF_ALLOC)
-        alloc += sec->get_rels(ctx).size();
-      else
-        nonalloc += sec->get_rels(ctx).size();
-    }
-
-    static Counter comdats("comdats");
-    comdats += obj->comdat_groups.size();
-
-    static Counter removed_comdats("removed_comdat_mem");
-    for (auto &pair : obj->comdat_groups)
-      if (ComdatGroup *group = pair.first; group->owner != obj->priority)
-        removed_comdats += pair.second.size();
-
-    static Counter num_cies("num_cies");
-    num_cies += obj->cies.size();
-
-    static Counter num_unique_cies("num_unique_cies");
-    for (CieRecord<E> &cie : obj->cies)
-      if (cie.is_leader)
-        num_unique_cies++;
-
-    static Counter num_fdes("num_fdes");
-    num_fdes +=  obj->fdes.size();
-  }
-
-  static Counter num_bytes("total_input_bytes");
-  for (std::unique_ptr<MappedFile<Context<E>>> &mf : ctx.mf_pool)
-    num_bytes += mf->size;
-
-  static Counter num_input_sections("input_sections");
-  for (ObjectFile<E> *file : ctx.objs)
-    num_input_sections += file->sections.size();
-
-  static Counter num_output_chunks("output_chunks", ctx.chunks.size());
-  static Counter num_objs("num_objs", ctx.objs.size());
-  static Counter num_dsos("num_dsos", ctx.dsos.size());
-
-  if constexpr (std::is_same_v<E, ARM64>) {
-    static Counter num_thunks("num_thunks");
-    for (std::unique_ptr<OutputSection<E>> &osec : ctx.output_sections)
-      for (std::unique_ptr<RangeExtensionThunk<E>> &thunk : osec->thunks)
-        num_thunks += thunk->symbols.size();
-  }
-
-  Counter::print();
-
-  for (std::unique_ptr<MergedSection<E>> &sec : ctx.merged_sections)
-    sec->print_stats(ctx);
-}
-
-template <typename E>
-static int elf_main(int argc, char **argv) {
-  Context<E> ctx;
-
-  // Process -run option first. process_run_subcommand() does not return.
-  if (argc >= 2 && (argv[1] == "-run"sv || argv[1] == "--run"sv)) {
-#if defined(_WIN32) || defined(__APPLE__)
-    Fatal(ctx) << ": -run is supported only on Unix";
-#endif
-    process_run_subcommand(ctx, argc, argv);
-  }
-
-  // Parse non-positional command line options
-  ctx.cmdline_args = expand_response_files(ctx, argv);
-  std::vector<std::string> file_args = parse_nonpositional_args(ctx);
-
-  // If no -m option is given, deduce it from input files.
-  if (ctx.arg.emulation == MachineType::NONE)
-    ctx.arg.emulation = deduce_machine_type(ctx, file_args);
-
-  // Redo if -m is not x86-64.
-  if (ctx.arg.emulation != E::machine_type) {
-#ifndef MOLD_DEBUG_X86_64_ONLY
-    switch (ctx.arg.emulation) {
-    case MachineType::I386:
-      return elf_main<I386>(argc, argv);
-    case MachineType::ARM64:
-      return elf_main<ARM64>(argc, argv);
-    case MachineType::ARM32:
-      return elf_main<ARM32>(argc, argv);
-    case MachineType::RISCV64:
-      return elf_main<RISCV64>(argc, argv);
-    case MachineType::RISCV32:
-      return elf_main<RISCV32>(argc, argv);
-    default:
-      unreachable();
-    }
-#endif
-    unreachable();
-  }
-
-  Timer t_all(ctx, "all");
-
-  install_signal_handler();
-
-  if (!ctx.arg.directory.empty())
-    if (chdir(ctx.arg.directory.c_str()) == -1)
-      Fatal(ctx) << "chdir failed: " << ctx.arg.directory
-                 << ": " << errno_string();
-
-  if (ctx.arg.relocatable) {
-    combine_objects(ctx, file_args);
-    return 0;
-  }
-
-  // Fork a subprocess unless --no-fork is given.
-  std::function<void()> on_complete;
-
-#if !defined(_WIN32) && !defined(__APPLE__)
-  if (ctx.arg.fork)
-    on_complete = fork_child();
-#endif
-
-  tbb::global_control tbb_cont(tbb::global_control::max_allowed_parallelism,
-                               ctx.arg.thread_count);
-
-  // Handle --wrap options if any.
-  for (std::string_view name : ctx.arg.wrap)
-    get_symbol(ctx, name)->wrap = true;
-
-  // Handle --retain-symbols-file options if any.
-  if (ctx.arg.retain_symbols_file)
-    for (std::string_view name : *ctx.arg.retain_symbols_file)
-      get_symbol(ctx, name)->write_to_symtab = true;
-
-  for (std::string_view arg : ctx.arg.trace_symbol)
-    get_symbol(ctx, arg)->traced = true;
-
-  // Parse input files
-  read_input_files(ctx, file_args);
-
-  // Uniquify shared object files by soname
-  {
-    std::unordered_set<std::string_view> seen;
-    std::erase_if(ctx.dsos, [&](SharedFile<E> *file) {
-      return !seen.insert(file->soname).second;
-    });
-  }
-
-  Timer t_total(ctx, "total");
-  Timer t_before_copy(ctx, "before_copy");
-
-  // Apply -exclude-libs
-  apply_exclude_libs(ctx);
-
-  // Create a dummy file containing linker-synthesized symbols.
-  create_internal_file(ctx);
-
-  // Resolve symbols and fix the set of object files that are
-  // included to the final output.
-  resolve_symbols(ctx);
-
-  // Resolve mergeable section pieces to merge them.
-  register_section_pieces(ctx);
-
-  // Remove redundant comdat sections (e.g. duplicate inline functions).
-  eliminate_comdats(ctx);
-
-  // Create .bss sections for common symbols.
-  convert_common_symbols(ctx);
-
-  // Apply version scripts.
-  apply_version_script(ctx);
-
-  // Parse symbol version suffixes (e.g. "foo@ver1").
-  parse_symbol_version(ctx);
-
-  // Set is_import and is_export bits for each symbol.
-  compute_import_export(ctx);
-
-  // Read address-significant section information.
-  if (ctx.arg.icf && !ctx.arg.icf_all)
-    mark_addrsig(ctx);
-
-  // Garbage-collect unreachable sections.
-  if (ctx.arg.gc_sections)
-    gc_sections(ctx);
-
-  // Merge identical read-only sections.
-  if (ctx.arg.icf)
-    icf_sections(ctx);
-
-  // Compute sizes of sections containing mergeable strings.
-  compute_merged_section_sizes(ctx);
-
-  // Create instances of linker-synthesized sections such as
-  // .got or .plt.
-  create_synthetic_sections(ctx);
-
-  // Bin input sections into output sections.
-  bin_sections(ctx);
-
-  // Get a list of output sections.
-  append(ctx.chunks, collect_output_sections(ctx));
-
-  // Add synthetic symbols such as __ehdr_start or __end.
-  add_synthetic_symbols(ctx);
-
-  // Beyond this point, no new files will be added to ctx.objs
-  // or ctx.dsos.
-
-  // Handle `-z cet-report`.
-  if (ctx.arg.z_cet_report != CET_REPORT_NONE)
-    check_cet_errors(ctx);
-
-  // Handle `-z execstack-if-needed`.
-  if (ctx.arg.z_execstack_if_needed)
-    for (ObjectFile<E> *file : ctx.objs)
-      if (file->needs_executable_stack)
-        ctx.arg.z_execstack = true;
-
-  // If we are linking a .so file, remaining undefined symbols does
-  // not cause a linker error. Instead, they are treated as if they
-  // were imported symbols.
-  //
-  // If we are linking an executable, weak undefs are converted to
-  // weakly imported symbol so that they'll have another chance to be
-  // resolved.
-  claim_unresolved_symbols(ctx);
-
-  // Beyond this point, no new symbols will be added to the result.
-
-  // Handle --print-dependencies
-  if (ctx.arg.print_dependencies == 1)
-    print_dependencies(ctx);
-  else if (ctx.arg.print_dependencies == 2)
-    print_dependencies_full(ctx);
-
-  // Handle -repro
-  if (ctx.arg.repro)
-    write_repro_file(ctx);
-
-  // Make sure that all symbols have been resolved.
-  if (!ctx.arg.allow_multiple_definition)
-    check_duplicate_symbols(ctx);
-
-  // Handle --require-defined
-  for (std::string_view name : ctx.arg.require_defined)
-    if (!get_symbol(ctx, name)->file)
-      Error(ctx) << "--require-defined: undefined symbol: " << name;
-
-  // .init_array and .fini_array contents have to be sorted by
-  // a special rule. Sort them.
-  sort_init_fini(ctx);
-
-  // Likewise, .ctors and .dtors have to be sorted. They are rare
-  // because they are superceded by .init_array/.fini_array, though.
-  sort_ctor_dtor(ctx);
-
-  // Handle --shuffle-sections
-  if (ctx.arg.shuffle_sections != SHUFFLE_SECTIONS_NONE)
-    shuffle_sections(ctx);
-
-  // Copy string referred by .dynamic to .dynstr.
-  for (SharedFile<E> *file : ctx.dsos)
-    ctx.dynstr->add_string(file->soname);
-  for (std::string_view str : ctx.arg.auxiliary)
-    ctx.dynstr->add_string(str);
-  for (std::string_view str : ctx.arg.filter)
-    ctx.dynstr->add_string(str);
-  if (!ctx.arg.rpaths.empty())
-    ctx.dynstr->add_string(ctx.arg.rpaths);
-  if (!ctx.arg.soname.empty())
-    ctx.dynstr->add_string(ctx.arg.soname);
-
-  // Scan relocations to find symbols that need entries in .got, .plt,
-  // .got.plt, .dynsym, .dynstr, etc.
-  scan_rels(ctx);
-
-  // Compute sizes of output sections while assigning offsets
-  // within an output section to input sections.
-  compute_section_sizes(ctx);
-
-  // Sort sections by section attributes so that we'll have to
-  // create as few segments as possible.
-  sort(ctx.chunks, [&](Chunk<E> *a, Chunk<E> *b) {
-    return get_section_rank(ctx, a) < get_section_rank(ctx, b);
-  });
-
-  // If --packed_dyn_relocs=relr was given, base relocations are stored
-  // to a .relr.dyn section in a compressed form. Construct a compressed
-  // relocations now so that we can fix section sizes and file layout.
-  if (ctx.arg.pack_dyn_relocs_relr)
-    construct_relr(ctx);
-
-  // Reserve a space for dynamic symbol strings in .dynstr and sort
-  // .dynsym contents if necessary. Beyond this point, no symbol will
-  // be added to .dynsym.
-  ctx.dynsym->finalize(ctx);
-
-  // Print reports about undefined symbols, if needed.
-  if (ctx.arg.unresolved_symbols == UNRESOLVED_ERROR)
-    report_undef_errors(ctx);
-
-  // Fill .gnu.version_d section contents.
-  if (ctx.verdef)
-    ctx.verdef->construct(ctx);
-
-  // Fill .gnu.version_r section contents.
-  ctx.verneed->construct(ctx);
-
-  // Compute .symtab and .strtab sizes for each file.
-  create_output_symtab(ctx);
-
-  // .eh_frame is a special section from the linker's point of view,
-  // as its contents are parsed and reconstructed by the linker,
-  // unlike other sections that are regarded as opaque bytes.
-  // Here, we construct output .eh_frame contents.
-  ctx.eh_frame->construct(ctx);
-
-  // Handle --gdb-index.
-  if (ctx.arg.gdb_index)
-    ctx.gdb_index->construct(ctx);
-
-  // If --emit-relocs is given, we'll copy relocation sections from input
-  // files to an output file.
-  if (ctx.arg.emit_relocs)
-    create_reloc_sections(ctx);
-
-  // Update sh_size for each chunk and remove empty ones.
-  for (Chunk<E> *chunk : ctx.chunks)
-    chunk->update_shdr(ctx);
-
-  std::erase_if(ctx.chunks, [](Chunk<E> *chunk) {
-    return chunk->kind() != OUTPUT_SECTION && chunk->shdr.sh_size == 0;
-  });
-
-  // Set section indices.
-  for (i64 i = 0, shndx = 1; i < ctx.chunks.size(); i++)
-    if (ctx.chunks[i]->kind() != HEADER)
-      ctx.chunks[i]->shndx = shndx++;
-
-  // Some types of section header refer other section by index.
-  // Recompute the section header to fill such fields with correct values.
-  for (Chunk<E> *chunk : ctx.chunks)
-    chunk->update_shdr(ctx);
-
-  // Assign offsets to output sections
-  i64 filesize = set_osec_offsets(ctx);
-
-  // On RISC-V, branches are encode using multiple instructions so
-  // that they can jump to anywhere in ±2 GiB by default. They may
-  // be replaced with shorter instruction sequences if destinations
-  // are close enough. Do this optimization.
-  if constexpr (std::is_same_v<E, RISCV64> || std::is_same_v<E, RISCV32>)
-    filesize = riscv_resize_sections(ctx);
-
-  // Fix linker-synthesized symbol addresses.
-  fix_synthetic_symbols(ctx);
-
-  // Beyond this, you can assume that symbol addresses including their
-  // GOT or PLT addresses have a correct final value.
-
-  // If --compress-debug-sections is given, compress .debug_* sections
-  // using zlib.
-  if (ctx.arg.compress_debug_sections != COMPRESS_NONE)
-    filesize = compress_debug_sections(ctx);
-
-  // At this point, file layout is fixed.
-
-  t_before_copy.stop();
-
-  // Create an output file
-  ctx.output_file =
-    OutputFile<Context<E>>::open(ctx, ctx.arg.output, filesize, 0777);
-  ctx.buf = ctx.output_file->buf;
-
-  Timer t_copy(ctx, "copy");
-
-  // Copy input sections to the output file
-  {
-    Timer t(ctx, "copy_buf");
-
-    tbb::parallel_for_each(ctx.chunks, [&](Chunk<E> *chunk) {
-      std::string name =
-        chunk->name.empty() ? "(header)" : std::string(chunk->name);
-      Timer t2(ctx, name, &t);
-      chunk->copy_buf(ctx);
-    });
-
-    report_undef_errors(ctx);
-  }
-
-  if constexpr (std::is_same_v<E, ARM32>)
-    sort_arm_exidx(ctx);
-
-  // Some part of .gdb_index couldn't be computed until other debug
-  // sections are complete. We have complete debug sections now, so
-  // write the rest of .gdb_index.
-  if (ctx.gdb_index)
-    ctx.gdb_index->write_address_areas(ctx);
-
-  // Dynamic linker works better with sorted .rela.dyn section,
-  // so we sort them.
-  ctx.reldyn->sort(ctx);
-
-  // Zero-clear paddings between sections
-  clear_padding(ctx);
-
-  if (ctx.buildid)
-    ctx.buildid->write_buildid(ctx);
-
-  t_copy.stop();
-  ctx.checkpoint();
-
-  // Close the output file. This is the end of the linker's main job.
-  ctx.output_file->close(ctx);
-
-  // Handle --dependency-file
-  if (!ctx.arg.dependency_file.empty())
-    write_dependency_file(ctx);
-
-  if (ctx.has_lto_object)
-    lto_cleanup(ctx);
-
-  t_total.stop();
-  t_all.stop();
-
-  if (ctx.arg.print_map)
-    print_map(ctx);
-
-  // Show stats numbers
-  if (ctx.arg.stats)
-    show_stats(ctx);
-
-  if (ctx.arg.perf)
-    print_timer_records(ctx.timer_records);
-
-  std::cout << std::flush;
-  std::cerr << std::flush;
-  if (on_complete)
-    on_complete();
-
-  if (ctx.arg.quick_exit)
-    _exit(0);
-
-  for (std::function<void()> &fn : ctx.on_exit)
-    fn();
-  ctx.checkpoint();
-  return 0;
-}
-
-int main(int argc, char **argv) {
-  return elf_main<X86_64>(argc, argv);
-}
-
-#define INSTANTIATE(E)                                                  \
-  template void read_file(Context<E> &, MappedFile<Context<E>> *);
-
-INSTANTIATE_ALL;
-
-} // namespace mold::elf

elf/relocatable.cc

@@ -1,596 +0,0 @@
-// This file implements the -r or ---relocatable option. If the option
-// is given to a linker, the linker creates not an executable nor a
-// shared library file but instead create another object file by
-// combining input object files.
-//
-// The behavior of a linker with -r is pretty different from the one
-// without -r, and adding code for -r to the regular code path could
-// severely complicate it. Therefore, we implement -r as an
-// independent feature from others. That's why this file share only a
-// small amount of code with other files.
-//
-// Since the -r option is a minor feature, we don't aim for speed in
-// this file. This is a "better than nothing" implementation of the -r
-// option.
-//
-// Here is the strategy as to how to combine multiple object files
-// into one:
-//
-//  - Regular sections containing opaque data (e.g. ".text" or
-//    ".data") are just copied as-is without merging.
-//
-//  - .symtab, .strtab and .shstrtab are merged.
-//
-//  - COMDAT groups are uniquified.
-//
-//  - Relocation sections are copied one by one, but we need to fix
-//    symbol indices.
-
-#include "mold.h"
-#include "../archive-file.h"
-#include "../output-file.h"
-
-#include <unordered_map>
-#include <unordered_set>
-
-namespace mold::elf {
-
-template <typename E> class RObjectFile;
-
-template <typename E>
-class RChunk {
-public:
-  RChunk() {
-    out_shdr.sh_addralign = 1;
-  }
-
-  virtual ~RChunk() = default;
-  virtual void update_shdr(Context<E> &ctx) {}
-  virtual void write_to(Context<E> &ctx) = 0;
-
-  std::string_view name;
-  i64 shndx = 0;
-  ElfShdr<E> in_shdr = {};
-  ElfShdr<E> out_shdr = {};
-};
-
-template <typename E>
-class RInputSection : public RChunk<E> {
-public:
-  RInputSection(Context<E> &ctx, RObjectFile<E> &file, const ElfShdr<E> &shdr);
-  void update_shdr(Context<E> &ctx) override;
-  void write_to(Context<E> &ctx) override;
-
-  RObjectFile<E> &file;
-};
-
-template <typename E>
-class RSymtabSection : public RChunk<E> {
-public:
-  RSymtabSection() {
-    this->name = ".symtab";
-    this->out_shdr.sh_type = SHT_SYMTAB;
-    this->out_shdr.sh_entsize = sizeof(ElfSym<E>);
-    this->out_shdr.sh_addralign = E::word_size;
-  }
-
-  void add_local_symbol(Context<E> &ctx, RObjectFile<E> &file, i64 idx);
-  void add_global_symbol(Context<E> &ctx, RObjectFile<E> &file, i64 idx);
-  void update_shdr(Context<E> &ctx) override;
-  void write_to(Context<E> &ctx) override;
-
-  std::unordered_map<std::string_view, i64> sym_map;
-  std::vector<ElfSym<E>> syms{1};
-};
-
-template <typename E>
-class RStrtabSection : public RChunk<E> {
-public:
-  RStrtabSection(std::string_view name) {
-    this->name = name;
-    this->out_shdr.sh_type = SHT_STRTAB;
-    this->out_shdr.sh_size = 1;
-  }
-
-  i64 add_string(std::string_view str);
-  void write_to(Context<E> &ctx) override;
-
-  std::unordered_map<std::string_view, i64> strings;
-};
-
-template <typename E>
-class ROutputEhdr : public RChunk<E> {
-public:
-  ROutputEhdr() {
-    this->out_shdr.sh_size = sizeof(ElfEhdr<E>);
-  }
-
-  void write_to(Context<E> &ctx) override;
-};
-
-template <typename E>
-class ROutputShdr : public RChunk<E> {
-public:
-  ROutputShdr() {
-    this->out_shdr.sh_size = sizeof(ElfShdr<E>);
-  }
-
-  void update_shdr(Context<E> &ctx) override;
-  void write_to(Context<E> &ctx) override;
-};
-
-template <typename E>
-class RObjectFile {
-public:
-  RObjectFile(Context<E> &ctx, MappedFile<Context<E>> &mf, bool is_alive);
-
-  void remove_comdats(Context<E> &ctx,
-                      std::unordered_set<std::string_view> &groups);
-
-  template <typename T>
-  std::span<T> get_data(Context<E> &ctx, const ElfShdr<E> &shdr);
-
-  MappedFile<Context<E>> &mf;
-  std::span<ElfShdr<E>> elf_sections;
-  std::vector<std::unique_ptr<RInputSection<E>>> sections;
-  std::span<const ElfSym<E>> syms;
-  std::vector<i64> symidx;
-  std::unordered_set<std::string_view> defined_syms;
-  std::unordered_set<std::string_view> undef_syms;
-  i64 symtab_shndx = 0;
-  i64 first_global = 0;
-  bool is_alive;
-  const char *strtab = nullptr;
-  const char *shstrtab = nullptr;
-};
-
-template <typename E>
-void RSymtabSection<E>::add_local_symbol(Context<E> &ctx, RObjectFile<E> &file,
-                                         i64 idx) {
-  ElfSym<E> sym = file.syms[idx];
-  assert(sym.st_bind == STB_LOCAL);
-
-  if (!sym.is_undef() && !sym.is_abs() && !sym.is_common()) {
-    if (!file.sections[sym.st_shndx])
-      return;
-    sym.st_shndx = file.sections[sym.st_shndx]->shndx;
-  }
-
-  std::string_view name = file.strtab + sym.st_name;
-  sym.st_name = ctx.r_strtab->add_string(name);
-
-  file.symidx[idx] = syms.size();
-  syms.push_back(sym);
-}
-
-template <typename E>
-void RSymtabSection<E>::add_global_symbol(Context<E> &ctx, RObjectFile<E> &file,
-                                          i64 idx) {
-  ElfSym<E> sym = file.syms[idx];
-  assert(sym.st_bind != STB_LOCAL);
-
-  std::string_view name = file.strtab + sym.st_name;
-  auto [it, inserted] = sym_map.insert({name, syms.size()});
-
-  if (inserted) {
-    if (!sym.is_undef() && !sym.is_abs() && !sym.is_common())
-      sym.st_shndx = file.sections[sym.st_shndx]->shndx;
-    sym.st_name = ctx.r_strtab->add_string(name);
-    file.symidx[idx] = syms.size();
-    syms.push_back(sym);
-    return;
-  }
-
-  file.symidx[idx] = it->second;
-
-  ElfSym<E> &existing = syms[it->second];
-  if (existing.is_undef() && !sym.is_undef()) {
-    if (!sym.is_abs() && !sym.is_common())
-      sym.st_shndx = file.sections[sym.st_shndx]->shndx;
-    sym.st_name = existing.st_name;
-    existing = sym;
-  }
-}
-
-template <typename E>
-void RSymtabSection<E>::update_shdr(Context<E> &ctx) {
-  this->out_shdr.sh_size = syms.size() * sizeof(ElfSym<E>);
-  this->out_shdr.sh_link = ctx.r_strtab->shndx;
-}
-
-template <typename E>
-void RSymtabSection<E>::write_to(Context<E> &ctx) {
-  ElfSym<E> *buf = (ElfSym<E> *)(ctx.buf + this->out_shdr.sh_offset);
-  for (i64 i = 1; i < syms.size(); i++)
-    buf[i] = syms[i];
-}
-
-template <typename E>
-RInputSection<E>::RInputSection(Context<E> &ctx, RObjectFile<E> &file,
-                                const ElfShdr<E> &shdr)
-  : file(file) {
-  this->name = file.shstrtab + shdr.sh_name;
-  this->in_shdr = shdr;
-  this->out_shdr = shdr;
-}
-
-template <typename E>
-void RInputSection<E>::update_shdr(Context<E> &ctx) {
-  switch (this->in_shdr.sh_type) {
-  case SHT_GROUP:
-    this->out_shdr.sh_link = ctx.r_symtab->shndx;
-    this->out_shdr.sh_info = file.symidx[this->in_shdr.sh_info];
-    break;
-  case SHT_REL:
-  case SHT_RELA:
-    this->out_shdr.sh_link = ctx.r_symtab->shndx;
-    this->out_shdr.sh_info = file.sections[this->in_shdr.sh_info]->shndx;
-    break;
-  default:
-    if (this->in_shdr.sh_link) {
-      std::unique_ptr<RInputSection<E>> &sec =
-        file.sections[this->in_shdr.sh_info];
-
-      if (sec)
-        this->out_shdr.sh_link = sec->shndx;
-      else if (this->in_shdr.sh_link == file.symtab_shndx)
-        this->out_shdr.sh_link = ctx.r_symtab->shndx;
-    }
-  }
-}
-
-template <typename E>
-void RInputSection<E>::write_to(Context<E> &ctx) {
-  if (this->in_shdr.sh_type == SHT_NOBITS)
-    return;
-
-  std::span<u8> contents = file.template get_data<u8>(ctx, this->in_shdr);
-  memcpy(ctx.buf + this->out_shdr.sh_offset, contents.data(), contents.size());
-
-  switch (this->in_shdr.sh_type) {
-  case SHT_GROUP: {
-    u32 *mem = (u32 *)(ctx.buf + this->out_shdr.sh_offset);
-    for (i64 i = 1; i < this->out_shdr.sh_size / sizeof(u32); i++)
-      mem[i] = file.sections[mem[i]]->shndx;
-    break;
-  }
-  case SHT_REL:
-  case SHT_RELA: {
-    ElfRel<E> *rel = (ElfRel<E> *)(ctx.buf + this->out_shdr.sh_offset);
-    i64 size = this->out_shdr.sh_size / sizeof(ElfRel<E>);
-
-    for (i64 i = 0; i < size; i++) {
-      const ElfSym<E> &sym = file.syms[rel[i].r_sym];
-      if (sym.is_undef() || sym.is_abs() || sym.is_common() ||
-          file.sections[sym.st_shndx])
-        rel[i].r_sym = file.symidx[rel[i].r_sym];
-      else
-        memset(rel + i, 0, sizeof(ElfRel<E>));
-    }
-
-    i64 i = 0;
-    i64 j = 0;
-    for (; j < size; j++)
-      if (rel[j].r_type)
-        rel[i++] = rel[j];
-    for (; i < size; i++)
-      memset(rel + i, 0, sizeof(ElfRel<E>));
-    break;
-  }
-  }
-}
-
-template <typename E>
-i64 RStrtabSection<E>::add_string(std::string_view str) {
-  auto [it, inserted] = strings.insert({str, this->out_shdr.sh_size});
-  if (inserted)
-    this->out_shdr.sh_size += str.size() + 1;
-  return it->second;
-}
-
-template <typename E>
-void RStrtabSection<E>::write_to(Context<E> &ctx) {
-  for (auto [str, offset] : strings)
-    memcpy(ctx.buf + this->out_shdr.sh_offset + offset, str.data(), str.size());
-}
-
-template <typename E>
-void ROutputEhdr<E>::write_to(Context<E> &ctx) {
-  ElfEhdr<E> &hdr = *(ElfEhdr<E> *)(ctx.buf + this->out_shdr.sh_offset);
-  memcpy(&hdr.e_ident, "\177ELF", 4);
-  hdr.e_ident[EI_CLASS] = (E::word_size == 8) ? ELFCLASS64 : ELFCLASS32;
-  hdr.e_ident[EI_DATA] = ELFDATA2LSB;
-  hdr.e_ident[EI_VERSION] = EV_CURRENT;
-  hdr.e_type = ET_REL;
-  hdr.e_machine = E::e_machine;
-  hdr.e_version = EV_CURRENT;
-  hdr.e_shoff = ctx.r_shdr->out_shdr.sh_offset;
-  hdr.e_ehsize = sizeof(ElfEhdr<E>);
-  hdr.e_shentsize = sizeof(ElfShdr<E>);
-  hdr.e_shstrndx = ctx.r_shstrtab->shndx;
-  hdr.e_shnum = ctx.r_shdr->out_shdr.sh_size / sizeof(ElfShdr<E>);
-  hdr.e_shstrndx = ctx.r_shstrtab->shndx;
-}
-
-template <typename E>
-void ROutputShdr<E>::update_shdr(Context<E> &ctx) {
-  for (RChunk<E> *chunk : ctx.r_chunks)
-    if (chunk->shndx)
-      this->out_shdr.sh_size += sizeof(ElfShdr<E>);
-}
-
-template <typename E>
-void ROutputShdr<E>::write_to(Context<E> &ctx) {
-  ElfShdr<E> *hdr = (ElfShdr<E> *)(ctx.buf + this->out_shdr.sh_offset);
-  for (RChunk<E> *chunk : ctx.r_chunks)
-    if (chunk->shndx)
-      hdr[chunk->shndx] = chunk->out_shdr;
-}
-
-template <typename E>
-RObjectFile<E>::RObjectFile(Context<E> &ctx, MappedFile<Context<E>> &mf,
-                            bool is_alive)
-  : mf(mf), is_alive(is_alive) {
-  // Read ELF header and section header
-  ElfEhdr<E> &ehdr = *(ElfEhdr<E> *)mf.data;
-  ElfShdr<E> *sh_begin = (ElfShdr<E> *)(mf.data + ehdr.e_shoff);
-  i64 num_sections = (ehdr.e_shnum == 0) ? sh_begin->sh_size : ehdr.e_shnum;
-  elf_sections = {sh_begin, sh_begin + num_sections};
-  sections.resize(num_sections);
-
-  // Read .shstrtab
-  i64 shstrtab_idx = (ehdr.e_shstrndx == SHN_XINDEX)
-    ? sh_begin->sh_link : ehdr.e_shstrndx;
-  shstrtab = (char *)(mf.data + elf_sections[shstrtab_idx].sh_offset);
-
-  // Read .symtab
-  for (i64 i = 1; i < elf_sections.size(); i++) {
-    ElfShdr<E> &shdr = elf_sections[i];
-    if (shdr.sh_type == SHT_SYMTAB) {
-      syms = get_data<const ElfSym<E>>(ctx, shdr);
-      strtab = (char *)(mf.data + elf_sections[shdr.sh_link].sh_offset);
-      symtab_shndx = i;
-      first_global = shdr.sh_info;
-      break;
-    }
-  }
-
-  symidx.resize(syms.size());
-
-  // Read sections
-  for (i64 i = 1; i < elf_sections.size(); i++) {
-    ElfShdr<E> &shdr = elf_sections[i];
-    switch (shdr.sh_type) {
-    case SHT_NULL:
-    case SHT_SYMTAB:
-    case SHT_STRTAB:
-      break;
-    default:
-      sections[i].reset(new RInputSection(ctx, *this, shdr));
-    }
-  }
-
-  // Read global symbols
-  for (i64 i = first_global; i < syms.size(); i++) {
-    std::string_view name = strtab + syms[i].st_name;
-    if (syms[i].is_defined())
-      defined_syms.insert(name);
-    else
-      undef_syms.insert(name);
-  }
-}
-
-// Remove duplicate comdat groups
-template <typename E>
-void RObjectFile<E>::remove_comdats(Context<E> &ctx,
-                                    std::unordered_set<std::string_view> &groups) {
-  for (i64 i = 1; i < sections.size(); i++) {
-    if (!sections[i])
-      continue;
-    ElfShdr<E> &shdr = sections[i]->in_shdr;
-    if (shdr.sh_type != SHT_GROUP)
-      continue;
-
-    // Get a comdat group signature and insert it into a set.
-    const ElfSym<E> &sym = syms[shdr.sh_info];
-    std::string_view signature = strtab + sym.st_name;
-    if (groups.insert(signature).second)
-      continue;
-
-    // If it is a duplicate, remove it and its members.
-    for (i64 j : this->template get_data<u32>(ctx, shdr).subspan(1))
-      sections[j] = nullptr;
-    sections[i] = nullptr;
-  }
-}
-
-template <typename E>
-template <typename T>
-std::span<T> RObjectFile<E>::get_data(Context<E> &ctx, const ElfShdr<E> &shdr) {
-  T *begin = (T *)(mf.data + shdr.sh_offset);
-  T *end   = (T *)(mf.data + shdr.sh_offset + shdr.sh_size);
-  return {begin, end};
-}
-
-template <typename E>
-static std::vector<std::unique_ptr<RObjectFile<E>>>
-open_files(Context<E> &ctx, std::span<std::string> args) {
-  std::vector<std::unique_ptr<RObjectFile<E>>> files;
-  bool whole_archive = false;
-
-  while (!args.empty()) {
-    const std::string &arg = args[0];
-    args = args.subspan(1);
-
-    if (arg == "--whole-archive") {
-      whole_archive = true;
-      continue;
-    }
-
-    if (arg == "--no-whole-archive") {
-      whole_archive = false;
-      continue;
-    }
-
-    if (arg.starts_with("--version-script=") ||
-        arg.starts_with("--dynamic-list=") ||
-        arg.starts_with("--export-dynamic-symbol=") ||
-        arg.starts_with("--export-dynamic-symbol-list="))
-      continue;
-
-    MappedFile<Context<E>> *mf = nullptr;
-
-    if (arg == "-l") {
-      mf = find_library(ctx, arg.substr(2));
-    } else {
-      if (arg.starts_with('-'))
-        continue;
-      mf = MappedFile<Context<E>>::must_open(ctx, arg);
-    }
-
-    switch (get_file_type(mf)) {
-    case FileType::ELF_OBJ:
-      files.emplace_back(new RObjectFile<E>(ctx, *mf, true));
-      break;
-    case FileType::AR:
-    case FileType::THIN_AR:
-      for (MappedFile<Context<E>> *child : read_archive_members(ctx, mf))
-        if (get_file_type(child) == FileType::ELF_OBJ)
-          files.emplace_back(new RObjectFile<E>(ctx, *child, whole_archive));
-      break;
-    default:
-      break;
-    }
-  }
-  return files;
-}
-
-template <typename E>
-static i64 assign_offsets(Context<E> &ctx) {
-  i64 offset = 0;
-  for (RChunk<E> *chunk : ctx.r_chunks) {
-    offset = align_to(offset, chunk->out_shdr.sh_addralign);
-    chunk->out_shdr.sh_offset = offset;
-    offset += chunk->out_shdr.sh_size;
-  }
-  return offset;
-}
-
-static bool contains(std::unordered_set<std::string_view> &a,
-                     std::unordered_set<std::string_view> &b) {
-  for (std::string_view x : b)
-    if (a.contains(x))
-      return true;
-  return false;
-}
-
-template <typename E>
-void combine_objects(Context<E> &ctx, std::span<std::string> file_args) {
-  // Read object files
-  std::vector<std::unique_ptr<RObjectFile<E>>> files = open_files(ctx, file_args);
-
-  // Identify needed objects
-  std::unordered_set<std::string_view> undef_syms;
-  auto add_syms = [&](RObjectFile<E> &file) {
-    undef_syms.insert(file.undef_syms.begin(), file.undef_syms.end());
-    for (std::string_view name : file.defined_syms)
-      undef_syms.erase(name);
-    file.is_alive = true;
-  };
-
-  for (std::unique_ptr<RObjectFile<E>> &file : files)
-    if (file->is_alive)
-      add_syms(*file);
-
-  for (;;) {
-    bool added = false;
-    for (std::unique_ptr<RObjectFile<E>> &file : files) {
-      if (!file->is_alive && contains(undef_syms, file->defined_syms)) {
-        add_syms(*file);
-        added = true;
-      }
-    }
-    if (!added)
-      break;
-  }
-
-  std::erase_if(files, [](std::unique_ptr<RObjectFile<E>> &file) {
-    return !file->is_alive;
-  });
-
-  // Remove duplicate comdat groups
-  std::unordered_set<std::string_view> comdat_groups;
-  for (std::unique_ptr<RObjectFile<E>> &file : files)
-    file->remove_comdats(ctx, comdat_groups);
-
-  // Create headers and linker-synthesized sections
-  ROutputEhdr<E> ehdr;
-  ROutputShdr<E> shdr;
-  RSymtabSection<E> symtab;
-  RStrtabSection<E> shstrtab(".shstrtab");
-  RStrtabSection<E> strtab(".strtab");
-
-  ctx.r_chunks.push_back(&ehdr);
-  ctx.r_chunks.push_back(&shstrtab);
-  ctx.r_chunks.push_back(&strtab);
-
-  ctx.r_ehdr = &ehdr;
-  ctx.r_shdr = &shdr;
-  ctx.r_shstrtab = &shstrtab;
-  ctx.r_strtab = &strtab;
-  ctx.r_symtab = &symtab;
-
-  // Add input sections to output sections
-  for (std::unique_ptr<RObjectFile<E>> &file : files)
-    for (std::unique_ptr<RInputSection<E>> &sec : file->sections)
-      if (sec)
-        ctx.r_chunks.push_back(sec.get());
-
-  ctx.r_chunks.push_back(&symtab);
-  ctx.r_chunks.push_back(&shdr);
-
-  // Assign output section indices
-  i64 shndx = 1;
-  for (RChunk<E> *chunk : ctx.r_chunks)
-    if (chunk != &ehdr && chunk != &shdr)
-      chunk->shndx = shndx++;
-
-  // Add section names to .shstrtab
-  for (RChunk<E> *chunk : ctx.r_chunks)
-    if (chunk->shndx)
-      chunk->out_shdr.sh_name = shstrtab.add_string(chunk->name);
-
-  // Copy symbols from input objects to an output object
-  for (std::unique_ptr<RObjectFile<E>> &file : files)
-    for (i64 i = 1; i < file->first_global; i++)
-      symtab.add_local_symbol(ctx, *file, i);
-
-  symtab.out_shdr.sh_info = symtab.syms.size();
-
-  for (std::unique_ptr<RObjectFile<E>> &file : files)
-    for (i64 i = file->first_global; i < file->syms.size(); i++)
-      symtab.add_global_symbol(ctx, *file, i);
-
-  // Finalize section header
-  for (RChunk<E> *chunk : ctx.r_chunks)
-    chunk->update_shdr(ctx);
-
-  // Open an output file
-  i64 filesize = assign_offsets(ctx);
-  std::unique_ptr<OutputFile<Context<E>>> out =
-    OutputFile<Context<E>>::open(ctx, ctx.arg.output, filesize, 0666);
-  memset(out->buf, 0, filesize);
-  ctx.buf = out->buf;
-
-  // Write to the output file
-  for (RChunk<E> *chunk : ctx.r_chunks)
-    chunk->write_to(ctx);
-  out->close(ctx);
-}
-
-#define INSTANTIATE(E)                                                  \
-  template void combine_objects(Context<E> &, std::span<std::string>);
-
-INSTANTIATE_ALL;
-
-} // namespace mold::elf

filepath.cc

@@ -1,27 +0,0 @@
-#include "mold.h"
-
-#include <filesystem>
-#include <sys/stat.h>
-
-namespace mold {
-
-std::string get_realpath(std::string_view path) {
-  std::error_code ec;
-  std::string ret = std::filesystem::canonical(path, ec).string();
-  return ec ? std::string(path) : ret;
-}
-
-// Removes redundant '/..' or '/.' from a given path.
-// The transformation is done purely by lexical processing.
-// This function does not access file system.
-std::string path_clean(std::string_view path) {
-  return filepath(path).lexically_normal().string();
-}
-
-std::filesystem::path to_abs_path(std::filesystem::path path) {
-  if (path.is_absolute())
-    return path;
-  return (std::filesystem::current_path() / path).lexically_normal();
-}
-
-} // namespace mold

filetype.h

@@ -1,156 +0,0 @@
-#pragma once
-
-#include "mold.h"
-#include "elf/elf.h"
-
-namespace mold {
-
-enum class FileType {
-  UNKNOWN,
-  EMPTY,
-  ELF_OBJ,
-  ELF_DSO,
-  MACH_OBJ,
-  MACH_EXE,
-  MACH_DYLIB,
-  MACH_BUNDLE,
-  MACH_UNIVERSAL,
-  AR,
-  THIN_AR,
-  TAPI,
-  TEXT,
-  GCC_LTO_OBJ,
-  LLVM_BITCODE,
-};
-
-template <typename C>
-bool is_text_file(MappedFile<C> *mf) {
-  u8 *data = mf->data;
-  return mf->size >= 4 && isprint(data[0]) && isprint(data[1]) &&
-         isprint(data[2]) && isprint(data[3]);
-}
-
-template <typename E, typename C>
-inline bool is_gcc_lto_obj(MappedFile<C> *mf) {
-  using namespace mold::elf;
-
-  const char *data = mf->get_contents().data();
-  ElfEhdr<E> &ehdr = *(ElfEhdr<E> *)data;
-  std::span<ElfShdr<E>> shdrs{(ElfShdr<E> *)(data + ehdr.e_shoff), ehdr.e_shnum};
-
-  for (ElfShdr<E> &sec : shdrs) {
-    if (sec.sh_type != SHT_SYMTAB)
-      continue;
-
-    std::span<ElfSym<E>> elf_syms{(ElfSym<E> *)(data + sec.sh_offset),
-                                  (size_t)sec.sh_size / sizeof(ElfSym<E>)};
-
-    auto skip = [](u8 type) {
-      return type == STT_NOTYPE || type == STT_FILE || type == STT_SECTION;
-    };
-
-    // GCC LTO object contains only sections symbols followed by a common
-    // symbol whose name is `__gnu_lto_v1` or `__gnu_lto_slim`.
-    i64 i = 1;
-    while (i < elf_syms.size() && skip(elf_syms[i].st_type))
-      i++;
-
-    if (i < elf_syms.size() && elf_syms[i].st_shndx == SHN_COMMON) {
-      std::string_view name =
-        data + shdrs[sec.sh_link].sh_offset + elf_syms[i].st_name;
-      if (name.starts_with("__gnu_lto_"))
-        return true;
-    }
-    break;
-  }
-
-  return false;
-}
-
-template <typename C>
-FileType get_file_type(MappedFile<C> *mf) {
-  std::string_view data = mf->get_contents();
-
-  if (data.empty())
-    return FileType::EMPTY;
-
-  if (data.starts_with("\177ELF")) {
-    switch (*(ul16 *)(data.data() + 16)) {
-    case 1: {
-      // ET_REL
-      elf::Elf32Ehdr &ehdr = *(elf::Elf32Ehdr *)data.data();
-
-      if (ehdr.e_ident[elf::EI_CLASS] == elf::ELFCLASS32) {
-        if (is_gcc_lto_obj<elf::I386>(mf))
-          return FileType::GCC_LTO_OBJ;
-      } else {
-        if (is_gcc_lto_obj<elf::X86_64>(mf))
-          return FileType::GCC_LTO_OBJ;
-      }
-
-      return FileType::ELF_OBJ;
-    }
-    case 3: // ET_DYN
-      return FileType::ELF_DSO;
-    }
-    return FileType::UNKNOWN;
-  }
-
-  if (data.starts_with("\xcf\xfa\xed\xfe")) {
-    switch (*(ul32 *)(data.data() + 12)) {
-    case 1: // MH_OBJECT
-      return FileType::MACH_OBJ;
-    case 2: // MH_EXECUTE
-      return FileType::MACH_EXE;
-    case 6: // MH_DYLIB
-      return FileType::MACH_DYLIB;
-    case 8: // MH_BUNDLE
-      return FileType::MACH_BUNDLE;
-    }
-    return FileType::UNKNOWN;
-  }
-
-  if (data.starts_with("!<arch>\n"))
-    return FileType::AR;
-  if (data.starts_with("!<thin>\n"))
-    return FileType::THIN_AR;
-  if (data.starts_with("--- !tapi-tbd"))
-    return FileType::TAPI;
-  if (data.starts_with("\xca\xfe\xba\xbe"))
-    return FileType::MACH_UNIVERSAL;
-  if (is_text_file(mf))
-    return FileType::TEXT;
-  if (data.starts_with("\xde\xc0\x17\x0b"))
-    return FileType::LLVM_BITCODE;
-  if (data.starts_with("BC\xc0\xde"))
-    return FileType::LLVM_BITCODE;
-  return FileType::UNKNOWN;
-}
-
-inline std::string filetype_to_string(FileType type) {
-  switch (type) {
-  case FileType::UNKNOWN: return "UNKNOWN";
-  case FileType::EMPTY: return "EMPTY";
-  case FileType::ELF_OBJ: return "ELF_OBJ";
-  case FileType::ELF_DSO: return "ELF_DSO";
-  case FileType::MACH_EXE: return "MACH_EXE";
-  case FileType::MACH_OBJ: return "MACH_OBJ";
-  case FileType::MACH_DYLIB: return "MACH_DYLIB";
-  case FileType::MACH_BUNDLE: return "MACH_BUNDLE";
-  case FileType::MACH_UNIVERSAL: return "MACH_UNIVERSAL";
-  case FileType::AR: return "AR";
-  case FileType::THIN_AR: return "THIN_AR";
-  case FileType::TAPI: return "TAPI";
-  case FileType::TEXT: return "TEXT";
-  case FileType::GCC_LTO_OBJ: return "GCC_LTO_OBJ";
-  case FileType::LLVM_BITCODE: return "LLVM_BITCODE";
-  }
-  return "UNKNOWN";
-}
-
-inline std::ostream &operator<<(std::ostream &out, FileType type) {
-  out << filetype_to_string(type);
-  return out;
-}
-
-} // namespace mold

glob.cc

@@ -1,149 +0,0 @@
-#include "mold.h"
-
-#include <cstring>
-
-namespace mold {
-
-std::optional<Glob> Glob::compile(std::string_view pat) {
-  std::vector<Element> vec;
-
-  while (!pat.empty()) {
-    u8 c = pat[0];
-    pat = pat.substr(1);
-
-    switch (c) {
-    case '[': {
-      // Here are a few bracket pattern examples:
-      //
-      // [abc]: a, b or c
-      // [$\]!]: $, ] or !
-      // [a-czg-i]: a, b, c, z, g, h, or i
-      // [^a-z]: Any character except lowercase letters
-      vec.push_back({BRACKET});
-      std::bitset<256> &bitset = vec.back().bitset;
-
-      bool negate = false;
-      if (!pat.empty() && pat[0] == '^') {
-        negate = true;
-        pat = pat.substr(1);
-      }
-
-      bool closed = false;
-
-      while (!pat.empty()) {
-        if (pat[0] == ']') {
-          pat = pat.substr(1);
-          closed = true;
-          break;
-        }
-
-        if (pat[0] == '\\') {
-          pat = pat.substr(1);
-          if (pat.empty())
-            return {};
-        }
-
-        if (pat.size() >= 3 && pat[1] == '-') {
-          u8 start = pat[0];
-          u8 end = pat[2];
-          pat = pat.substr(3);
-
-          if (end == '\\') {
-            if (pat.empty())
-              return {};
-            end = pat[0];
-            pat = pat.substr(1);
-          }
-
-          if (end < start)
-            return {};
-
-          for (i64 i = start; i <= end; i++)
-            bitset[i] = true;
-        } else {
-          bitset[(u8)pat[0]] = true;
-          pat = pat.substr(1);
-        }
-      }
-
-      if (!closed)
-        return {};
-
-      if (negate)
-        bitset.flip();
-      break;
-    }
-    case '?':
-      vec.push_back({QUESTION});
-      break;
-    case '*':
-      vec.push_back({STAR});
-      break;
-    default:
-      if (vec.empty() || vec.back().kind != STRING)
-        vec.push_back({STRING});
-      vec.back().str += c;
-      break;
-    }
-  }
-
-  return {Glob{std::move(vec)}};
-}
-
-bool Glob::match(std::string_view str) {
-  return do_match(str, elements);
-}
-
-bool Glob::do_match(std::string_view str, std::span<Element> elements) {
-  while (!elements.empty()) {
-    Element &e = elements[0];
-    elements = elements.subspan(1);
-
-    switch (e.kind) {
-    case STRING:
-      if (str.empty() || !str.starts_with(e.str))
-        return false;
-      str = str.substr(e.str.size());
-      break;
-    case STAR:
-      if (elements.empty())
-        return true;
-
-      // Patterns like "*foo*bar*" should be much more common than more
-      // complex ones like "*foo*[abc]*" or "*foo**?bar*", so we optimize
-      // the former case here.
-      if (elements[0].kind == STRING) {
-        for (;;) {
-          size_t pos = str.find(elements[0].str);
-          if (pos == str.npos)
-            break;
-          if (do_match(str.substr(pos + elements[0].str.size()),
-                       elements.subspan(1)))
-            return true;
-          str = str.substr(pos + 1);
-        }
-        return false;
-      }
-
-      // Other cases are handled here.
-      for (i64 j = 0; j < str.size(); j++)
-        if (do_match(str.substr(j), elements))
-          return true;
-      return false;
-    case QUESTION:
-      if (str.empty())
-        return false;
-      str = str.substr(1);
-      break;
-    case BRACKET:
-      if (str.empty() || !e.bitset[str[0]])
-        return false;
-      str = str.substr(1);
-      break;
-    }
-  }
-
-  return str.empty();
-}
-
-} // namespace mold

install-build-deps.sh

@@ -1,38 +1,54 @@
-#!/bin/bash -x
+#!/bin/sh
+# This script installs binary packages needed to build mold.
+# Feel free to send me a PR if your OS is not on this list.
+
 set -e
-source /etc/os-release
+. /etc/os-release
 
-# The first line for each distro installs a build dependency.
-# The second line installs extra packages for `make test`.
-#
-# Feel free to send me a PR if you find a missing OS.
+set -x
 
-case "$ID-$VERSION_ID" in
-ubuntu-20.* | pop-20.*)
-  apt-get install -y cmake python3 libssl-dev zlib1g-dev gcc g++ g++-10
-  apt-get install -y file bsdmainutils
+case "$ID" in
+ubuntu | pop | linuxmint | debian | raspbian | neon | zorin)
+  apt-get update
+  apt-get install -y cmake gcc g++ clang gdb
   ;;
-ubuntu-22.* | pop-22.* | debian-11)
-  apt-get install -y cmake python3 libssl-dev zlib1g-dev gcc g++
-  apt-get install -y file bsdmainutils
+fedora | fedora-* | amzn | rhel | centos)
+  dnf install -y gcc-c++ cmake glibc-static libstdc++-static diffutils util-linux tar
   ;;
-fedora-*)
-  dnf install -y gcc-g++ cmake openssl-devel zlib-devel
-  dnf install -y glibc-static file libstdc++-static diffutils
+rocky | ol)
+  dnf install -y gcc-c++ cmake diffutils util-linux
   ;;
-opensuse-leap-*)
-  zypper install -y make cmake python3 zlib-devel libopenssl-devel gcc-c++ gcc11-c++
-  zypper install -y glibc-devel-static tar diffutils util-linux
+opensuse-*)
+  zypper install -y make cmake gcc-c++ glibc-devel-static tar diffutils util-linux gawk
   ;;
-opensuse-tumbleweed-*)
-  zypper install -y make cmake python3 zlib-devel libopenssl-devel gcc-c++
-  zypper install -y glibc-devel-static tar diffutils util-linux
+gentoo)
+  emerge-webrsync
+  FEATURES='getbinpkg binpkg-request-signature' emerge dev-build/cmake
   ;;
-gentoo-*)
-  emerge dev-util/cmake sys-libs/zlib
+arch | archarm | artix | endeavouros | manjaro | cachyos)
+  pacman -Sy --needed --noconfirm base-devel cmake util-linux
   ;;
-arch-*)
-  pacman -S --needed --noconfirm base-devel python3 zlib openssl cmake util-linux
+void)
+  xbps-install -Sy xbps bash make cmake gcc tar diffutils util-linux
+  ;;
+alpine)
+  apk update
+  apk add bash make linux-headers cmake gcc g++
+  ;;
+clear-linux-os)
+  swupd update
+  swupd bundle-add c-basic diffutils
+  ;;
+almalinux)
+  dnf install -y gcc-toolset-13-gcc-c++ gcc-toolset-13-libstdc++-devel cmake diffutils
+  ;;
+altlinux)
+  apt-get update
+  apt-get install -y gcc-c++ make cmake ctest diffutils util-linux
+  ;;
+freebsd)
+  pkg update
+  pkg install -y cmake bash binutils gcc
   ;;
 *)
   echo "Error: don't know anything about build dependencies on $ID-$VERSION_ID"

install-cross-tools.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -e
+. /etc/os-release
+
+set -x
+
+# This script install packages for -DMOLD_ENABLE_QEMU_TESTS=1
+# to enable cross-target tests.
+#
+# Feel free to send me a PR if your OS is not on this list.
+
+case "$ID" in
+ubuntu | pop | linuxmint | debian | raspbian)
+  apt-get install -y qemu-user {gcc,g++}-{i686,aarch64,riscv64,powerpc,powerpc64,powerpc64le,s390x,sparc64,m68k,sh4}-linux-gnu {gcc,g++}-arm-linux-gnueabihf
+  ;;
+*)
+  echo "Error: don't know anything about build dependencies on $ID-$VERSION_ID"
+  exit 1
+esac

inttypes.h

@@ -1,181 +0,0 @@
-// This file defines integral types for file input/output. You should
-// use these types instead of the plain integers (such as u32 or i32)
-// when reading from/writing to an mmap'ed file area.
-//
-// Here is why you need these types. In C/C++, all data accesses must
-// be aligned. That is, if you read an N byte value from memory, the
-// address of that value must be a multiple of N. For example, reading
-// an u32 value from address 16 is legal, while reading from 18 is not
-// (since 18 is not a multiple of 4.) An unaligned access yields an
-// undefined behavior.
-//
-// All data members of the ELF data structures are naturally aligned,
-// so it may look like we don't need the integral types defined in
-// this file to access them. But there's a catch; if an object file is
-// in an archive file (a .a file), the beginning of the file is
-// guaranteed to be aligned only to a 2 bytes boundary, because ar
-// aligns each member only to a 2 byte boundary. Therefore, any data
-// members larger than 2 bytes may be unaligned in an mmap'ed memory,
-// and thus you always need to use the integral types in this file to
-// access it.
-
-#pragma once
-
-#include <cstdint>
-#include <cstring>
-
-#ifdef __BIG_ENDIAN__
-#error "mold does not support big-endian hosts"
-#endif
-
-namespace mold {
-
-template <typename T, size_t SIZE = sizeof(T)>
-class LittleEndian {
-public:
-  LittleEndian() { *this = 0; }
-  LittleEndian(T x) { *this = x; }
-
-  operator T() const {
-    T x = 0;
-    memcpy(&x, val, SIZE);
-    return x;
-  }
-
-  LittleEndian &operator=(T x) {
-    memcpy(&val, &x, SIZE);
-    return *this;
-  }
-
-  LittleEndian &operator++() {
-    return *this = *this + 1;
-  }
-
-  LittleEndian operator++(int) {
-    T ret = *this;
-    *this = *this + 1;
-    return ret;
-  }
-
-  LittleEndian &operator--() {
-    return *this = *this - 1;
-  }
-
-  LittleEndian operator--(int) {
-    T ret = *this;
-    *this = *this - 1;
-    return ret;
-  }
-
-  LittleEndian &operator+=(T x) {
-    return *this = *this + x;
-  }
-
-  LittleEndian &operator-=(T x) {
-    return *this = *this - x;
-  }
-
-  LittleEndian &operator&=(T x) {
-    return *this = *this & x;
-  }
-
-  LittleEndian &operator|=(T x) {
-    return *this = *this | x;
-  }
-
-private:
-  uint8_t val[SIZE];
-};
-
-using il16 = LittleEndian<int16_t>;
-using il32 = LittleEndian<int32_t>;
-using il64 = LittleEndian<int64_t>;
-using ul16 = LittleEndian<uint16_t>;
-using ul24 = LittleEndian<uint32_t, 3>;
-using ul32 = LittleEndian<uint32_t>;
-using ul64 = LittleEndian<uint64_t>;
-
-template <typename T>
-class BigEndian {
-public:
-  BigEndian() = delete;
-
-  operator T() const {
-    T x;
-    memcpy(&x, val, sizeof(T));
-    return bswap(x);
-  }
-
-  BigEndian &operator=(T x) {
-    x = bswap(x);
-    memcpy(&val, &x, sizeof(T));
-    return *this;
-  }
-
-  BigEndian &operator++() {
-    return *this = *this + 1;
-  }
-
-  BigEndian operator++(int) {
-    T ret = *this;
-    *this = *this + 1;
-    return ret;
-  }
-
-  BigEndian &operator--() {
-    return *this = *this - 1;
-  }
-
-  BigEndian operator--(int) {
-    T ret = *this;
-    *this = *this - 1;
-    return ret;
-  }
-
-  BigEndian &operator+=(T x) {
-    return *this = *this + x;
-  }
-
-  BigEndian &operator&=(T x) {
-    return *this = *this & x;
-  }
-
-  BigEndian &operator|=(T x) {
-    return *this = *this | x;
-  }
-
-private:
-  uint8_t val[sizeof(T)];
-
-  static T bswap(T x) {
-    // Compiler is usually smart enough to compile the following code into
-    // a single bswap instruction. See https://godbolt.org/z/7nvaM7qab
-    if constexpr (sizeof(T) == 2) {
-      return ((x & 0xff00) >> 8) |
-             ((x & 0x00ff) << 8);
-    } else if constexpr (sizeof(T) == 4) {
-      return ((x & 0xff000000) >> 24) |
-             ((x & 0x00ff0000) >> 8)  |
-             ((x & 0x0000ff00) << 8)  |
-             ((x & 0x000000ff) << 24);
-    } else {
-      return ((x & 0xff000000'00000000) >> 56) |
-             ((x & 0x00ff0000'00000000) >> 40) |
-             ((x & 0x0000ff00'00000000) >> 24) |
-             ((x & 0x000000ff'00000000) >> 8)  |
-             ((x & 0x00000000'ff000000) << 8)  |
-             ((x & 0x00000000'00ff0000) << 24) |
-             ((x & 0x00000000'0000ff00) << 40) |
-             ((x & 0x00000000'000000ff) << 56);
-    }
-  }
-};
-
-using ib16 = BigEndian<int16_t>;
-using ib32 = BigEndian<int32_t>;
-using ib64 = BigEndian<int64_t>;
-using ub16 = BigEndian<uint16_t>;
-using ub32 = BigEndian<uint32_t>;
-using ub64 = BigEndian<uint64_t>;
-
-} // namespace mold

lib/aho-corasick.cc

@@ -0,0 +1,132 @@
+// This file implements the Aho-Corasick algorithm to search multiple
+// strings within an input string simultaneously. It is essentially a
+// trie with additional links. For details, see
+// https://en.wikipedia.org/wiki/Aho-Corasick_algorithm.
+//
+// We use it for simple glob patterns in version scripts or dynamic
+// list files. Here are some examples of glob patterns:
+//
+//    qt_private_api_tag*
+//    *16QAccessibleCache*
+//    *32QAbstractFileIconProviderPrivate*
+//    *17QPixmapIconEngine*
+//
+// Aho-Corasick can do only substring search, so it cannot handle
+// complex glob patterns such as `*foo*bar*`. We handle such patterns
+// with the Glob class.
+
+#include "lib.h"
+
+#include <queue>
+
+namespace mold {
+
+bool AhoCorasick::can_handle(std::string_view pat) {
+  if (pat.starts_with('*'))
+    pat.remove_prefix(1);
+  if (pat.ends_with('*'))
+    pat.remove_suffix(1);
+  return pat.find_first_of("*?[") == pat.npos;
+}
+
+i64 AhoCorasick::find(std::string_view str) {
+  if (nodes.empty())
+    return -1;
+
+  i64 idx = 0;
+  i64 val = -1;
+
+  auto walk = [&](u8 c) {
+    for (i64 j = idx; j != -1; j = nodes[j].suffix_link) {
+      i64 child = nodes[j].children[c];
+      if (child != -1) {
+        idx = child;
+        val = std::max(val, nodes[child].value);
+        return;
+      }
+    }
+    idx = 0;
+  };
+
+  walk('\0');
+  for (u8 c : str)
+    walk(c);
+  walk('\0');
+  return val;
+}
+
+bool AhoCorasick::add(std::string_view pat, i64 val) {
+  assert(can_handle(pat));
+  if (nodes.empty())
+    nodes.resize(1);
+  i64 idx = 0;
+
+  auto walk = [&](u8 c) {
+    if (nodes[idx].children[c] == -1) {
+      nodes[idx].children[c] = nodes.size();
+      nodes.resize(nodes.size() + 1);
+    }
+    idx = nodes[idx].children[c];
+  };
+
+  // We handle "foo" as if "\0foo\0", "*foo" as if "foo\0", "foo*" as
+  // if "\0foo", and "*foo*" as if "foo". Aho-Corasick can do only
+  // substring matching, so we use \0 as a beginning/end-of-string
+  // markers.
+  if (!pat.starts_with('*'))
+    walk('\0');
+  for (u8 c : pat)
+    if (c != '*')
+      walk(c);
+  if (!pat.ends_with('*'))
+    walk('\0');
+
+  nodes[idx].value = std::max(nodes[idx].value, val);
+  return true;
+}
+
+void AhoCorasick::compile() {
+  if (nodes.empty())
+    return;
+  fix_suffix_links(0);
+  fix_values();
+}
+
+void AhoCorasick::fix_suffix_links(i64 idx) {
+  for (i64 i = 0; i < 256; i++) {
+    i64 child = nodes[idx].children[i];
+    if (child == -1)
+      continue;
+
+    i64 j = nodes[idx].suffix_link;
+    for (; j != -1; j = nodes[j].suffix_link) {
+      if (nodes[j].children[i] != -1) {
+        nodes[child].suffix_link = j;
+        break;
+      }
+    }
+    if (j == -1)
+      nodes[child].suffix_link = 0;
+    fix_suffix_links(child);
+  }
+}
+
+void AhoCorasick::fix_values() {
+  std::queue<i64> queue;
+  queue.push(0);
+
+  do {
+    i64 idx = queue.front();
+    queue.pop();
+
+    for (i64 child : nodes[idx].children) {
+      if (child != -1) {
+        i64 suffix = nodes[child].suffix_link;
+        nodes[child].value = std::max(nodes[child].value, nodes[suffix].value);
+        queue.push(child);
+      }
+    }
+  } while (!queue.empty());
+}
+
+} // namespace mold

lib/atomics.h

@@ -0,0 +1,50 @@
+// This is the same as std::atomic except that the default memory
+// order is relaxed instead of sequential consistency.
+
+#pragma once
+
+#include <atomic>
+
+namespace mold {
+
+template <typename T>
+struct Atomic : std::atomic<T> {
+  static constexpr std::memory_order relaxed = std::memory_order_relaxed;
+
+  using std::atomic<T>::atomic;
+
+  Atomic(const Atomic<T> &other) : std::atomic<T>(other.load()) {}
+
+  Atomic<T> &operator=(const Atomic<T> &other) {
+    store(other.load());
+    return *this;
+  }
+
+  void operator=(T val) { store(val); }
+  operator T() const { return load(); }
+
+  void store(T val, std::memory_order order = relaxed) {
+    std::atomic<T>::store(val, order);
+  }
+
+  T load(std::memory_order order = relaxed) const {
+    return std::atomic<T>::load(order);
+  }
+
+  T exchange(T val) { return std::atomic<T>::exchange(val, relaxed); }
+  T operator|=(T val) { return std::atomic<T>::fetch_or(val, relaxed); }
+  T operator++() { return std::atomic<T>::fetch_add(1, relaxed) + 1; }
+  T operator--() { return std::atomic<T>::fetch_sub(1, relaxed) - 1; }
+  T operator++(int) { return std::atomic<T>::fetch_add(1, relaxed); }
+  T operator--(int) { return std::atomic<T>::fetch_sub(1, relaxed); }
+
+  bool test_and_set() {
+    // A relaxed load + branch (assuming miss) takes only around 20 cycles,
+    // while an atomic RMW can easily take hundreds on x86. We note that it's
+    // common that another thread beat us in marking, so doing an optimistic
+    // early test tends to improve performance in the ~20% ballpark.
+    return load() || exchange(true);
+  }
+};
+
+} // namespace mold

lib/bitvector.h

@@ -0,0 +1,78 @@
+#pragma once
+
+#include "integers.h"
+
+#include <cassert>
+#include <vector>
+
+namespace mold {
+
+class BitvectorProxy {
+public:
+  BitvectorProxy(u64 &word, size_t pos)
+    : word(word), mask(1ULL << pos) {}
+
+  BitvectorProxy &operator=(bool val) {
+    if (val)
+      word |= mask;
+    else
+      word &= ~mask;
+    return *this;
+  }
+
+  BitvectorProxy &operator=(const BitvectorProxy &other) {
+    return *this = (bool)other;
+  }
+
+  operator bool() const {
+    return word & mask;
+  }
+
+private:
+  u64 &word;
+  u64 mask;
+};
+
+class Bitvector {
+public:
+  Bitvector() = default;
+  Bitvector(i64 n) : size(n), words((n + 63) / 64) {}
+
+  void resize(i64 n) {
+    words.clear();
+    words.resize((n + 63) / 64);
+    size = n;
+  }
+
+  Bitvector &operator|=(const Bitvector &x) {
+    assert(size == x.size);
+    for (i64 i = 0; i < words.size(); i++)
+      words[i] |= x.words[i];
+    return *this;
+  }
+
+  Bitvector &operator&=(const Bitvector &x) {
+    assert(size == x.size);
+    for (i64 i = 0; i < words.size(); i++)
+      words[i] &= x.words[i];
+    return *this;
+  }
+
+  Bitvector &operator<<=(size_t n) {
+    assert(n == 1);
+    for (i64 i = words.size() - 1; i > 0; i--)
+      words[i] = (words[i] << 1) | (words[i - 1] >> 63);
+    words[0] <<= 1;
+    return *this;
+  }
+
+  BitvectorProxy operator[](size_t pos) {
+    assert(pos < size);
+    return {words[pos / 64], pos % 64};
+  }
+
+  i64 size = 0;
+  std::vector<u64> words;
+};
+
+} // namespace mold

lib/compress.cc

@@ -0,0 +1,174 @@
+// This file implements a multi-threaded zlib and zstd compression
+// routine.
+//
+// zlib-compressed data can be merged just by concatenation as long as
+// each piece of data is flushed with Z_SYNC_FLUSH. In this file, we
+// split input data into multiple shards, compress them individually
+// and concatenate them. We then append a header, a trailer and a
+// checksum so that the concatenated data is valid zlib-format data.
+//
+// zstd-compressed data can be merged in the same way.
+//
+// Using threads to compress data has a downside. Since the dictionary
+// is reset on boundaries of shards, compression ratio is sacrificed
+// a little bit. However, if a shard size is large enough, that loss
+// is negligible in practice.
+
+#include "lib.h"
+
+#include <tbb/parallel_for_each.h>
+#include <zlib.h>
+#include <zstd.h>
+
+#define CHECK(fn)                               \
+  do {                                          \
+    [[maybe_unused]] int r = (fn);              \
+    assert(r == Z_OK);                          \
+  } while (0)
+
+namespace mold {
+
+static constexpr i64 SHARD_SIZE = 1024 * 1024;
+
+Compressor::~Compressor() {
+  for (std::span<u8> shard : shards)
+    delete[] shard.data();
+}
+
+static std::vector<std::span<u8>> split(std::span<u8> input) {
+  std::vector<std::span<u8>> vec;
+  while (!input.empty()) {
+    i64 sz = std::min<i64>(SHARD_SIZE, input.size());
+    vec.push_back(input.subspan(0, sz));
+    input = input.subspan(sz);
+  }
+  return vec;
+}
+
+static std::span<u8> zlib_compress(std::span<u8> input, int level) {
+  // Initialize zlib stream. Since debug info is generally compressed
+  // pretty well with lower compression levels, the default level is 1.
+  z_stream strm = {};
+  CHECK(deflateInit2(&strm, level, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY));
+
+  // Set an input buffer
+  strm.avail_in = input.size();
+  strm.next_in = input.data();
+
+  // Set an output buffer. deflateBound() returns an upper bound
+  // on the compression size. +16 for Z_SYNC_FLUSH.
+  i64 bufsize = deflateBound(&strm, strm.avail_in) + 16;
+  u8 *buf = new u8[bufsize];
+
+  // Compress data. It writes all compressed bytes except the last
+  // partial byte, so up to 7 bits can be held to be written to the
+  // buffer.
+  strm.avail_out = bufsize;
+  strm.next_out = buf;
+  CHECK(deflate(&strm, Z_BLOCK));
+
+  // This is a workaround for libbacktrace before 2022-04-06.
+  //
+  // Zlib is a bit stream, and what Z_SYNC_FLUSH does is to write a
+  // three bit value indicating the start of an uncompressed data
+  // block followed by four byte data 00 00 ff ff which indicates that
+  // the length of the block is zero. libbacktrace uses its own zlib
+  // inflate routine, and it had a bug that if that particular three
+  // bit value happens to end at a byte boundary, it accidentally
+  // skipped the next byte.
+  //
+  // In order to avoid triggering that bug, we should avoid calling
+  // deflate() with Z_SYNC_FLUSH if the current bit position is 5.
+  // If it's 5, we insert an empty block consisting of 10 bits so
+  // that the bit position is 7 in the next byte.
+  //
+  // https://github.com/ianlancetaylor/libbacktrace/pull/87
+  int nbits = 0;
+  deflatePending(&strm, Z_NULL, &nbits);
+  if (nbits == 5)
+    CHECK(deflatePrime(&strm, 10, 2));
+  CHECK(deflate(&strm, Z_SYNC_FLUSH));
+
+  deflateEnd(&strm);
+  return {buf, (size_t)(bufsize - strm.avail_out)};
+}
+
+ZlibCompressor::ZlibCompressor(u8 *buf, i64 size, i64 level) {
+  std::vector<std::span<u8>> inputs = split(std::span(buf, size));
+  std::vector<u32> adlers(inputs.size());
+  shards.resize(inputs.size());
+
+  // Compress each shard
+  tbb::parallel_for((i64)0, (i64)inputs.size(), [&](i64 i) {
+    std::span<u8> in = inputs[i];
+    adlers[i] = adler32(1, in.data(), in.size());
+    shards[i] = zlib_compress(in, level);
+  });
+
+  // Combine checksums
+  checksum = adlers[0];
+  for (i64 i = 1; i < inputs.size(); i++)
+    checksum = adler32_combine(checksum, adlers[i], inputs[i].size());
+
+  // Comput the total size
+  compressed_size = 8; // the header and the trailer
+  for (std::span<u8> &shard : shards)
+    compressed_size += shard.size();
+}
+
+void ZlibCompressor::write_to(u8 *buf) {
+  // Write a zlib-format header
+  buf[0] = 0x78;
+  buf[1] = 0x9c;
+
+  // Copy compressed data
+  std::vector<i64> offsets(shards.size());
+  offsets[0] = 2; // +2 for the header
+  for (i64 i = 1; i < shards.size(); i++)
+    offsets[i] = offsets[i - 1] + shards[i - 1].size();
+
+  tbb::parallel_for((i64)0, (i64)shards.size(), [&](i64 i) {
+    memcpy(buf + offsets[i], shards[i].data(), shards[i].size());
+  });
+
+  // Write a trailer
+  u8 *end = buf + compressed_size;
+  end[-6] = 3;
+  end[-5] = 0;
+  *(ub32 *)(end - 4) = checksum;
+}
+
+static std::span<u8> zstd_compress(std::span<u8> input, int level) {
+  i64 bufsize = ZSTD_COMPRESSBOUND(input.size());
+  u8 *buf = new u8[bufsize];
+  size_t sz = ZSTD_compress(buf, bufsize, input.data(), input.size(), level);
+  assert(!ZSTD_isError(sz));
+  return {buf, sz};
+}
+
+ZstdCompressor::ZstdCompressor(u8 *buf, i64 size, i64 level) {
+  std::vector<std::span<u8>> inputs = split(std::span(buf, size));
+  shards.resize(inputs.size());
+
+  // Compress each shard
+  tbb::parallel_for((i64)0, (i64)inputs.size(), [&](i64 i) {
+    shards[i] = zstd_compress(inputs[i], level);
+  });
+
+  compressed_size = 0;
+  for (std::span<u8> &shard : shards)
+    compressed_size += shard.size();
+}
+
+void ZstdCompressor::write_to(u8 *buf) {
+  // Copy compressed data
+  std::vector<i64> offsets(shards.size());
+  for (i64 i = 1; i < shards.size(); i++)
+    offsets[i] = offsets[i - 1] + shards[i - 1].size();
+
+  tbb::parallel_for((i64)0, (i64)shards.size(), [&](i64 i) {
+    memcpy(buf + offsets[i], shards[i].data(), shards[i].size());
+  });
+}
+
+} // namespace mold

lib/config.h.in

@@ -0,0 +1,29 @@
+#define MOLD_VERSION "@mold_VERSION@"
+#define MOLD_LIBDIR "@CMAKE_INSTALL_FULL_LIBDIR@"
+#define MOLD_FIRST_TARGET @MOLD_FIRST_TARGET@
+
+#cmakedefine01 HAVE_MADVISE
+#cmakedefine01 HAVE_UNAME
+#cmakedefine01 MOLD_USE_MIMALLOC
+#cmakedefine01 MOLD_USE_SYSTEM_MIMALLOC
+
+#cmakedefine01 HAVE_TARGET_X86_64
+#cmakedefine01 HAVE_TARGET_I386
+#cmakedefine01 HAVE_TARGET_ARM64LE
+#cmakedefine01 HAVE_TARGET_ARM64BE
+#cmakedefine01 HAVE_TARGET_ARM32LE
+#cmakedefine01 HAVE_TARGET_ARM32BE
+#cmakedefine01 HAVE_TARGET_RV32LE
+#cmakedefine01 HAVE_TARGET_RV32BE
+#cmakedefine01 HAVE_TARGET_RV64LE
+#cmakedefine01 HAVE_TARGET_RV64BE
+#cmakedefine01 HAVE_TARGET_PPC32
+#cmakedefine01 HAVE_TARGET_PPC64V1
+#cmakedefine01 HAVE_TARGET_PPC64V2
+#cmakedefine01 HAVE_TARGET_S390X
+#cmakedefine01 HAVE_TARGET_SPARC64
+#cmakedefine01 HAVE_TARGET_M68K
+#cmakedefine01 HAVE_TARGET_SH4LE
+#cmakedefine01 HAVE_TARGET_SH4BE
+#cmakedefine01 HAVE_TARGET_LOONGARCH64
+#cmakedefine01 HAVE_TARGET_LOONGARCH32

lib/crc32.cc

@@ -0,0 +1,60 @@
+#include "lib.h"
+
+#include <tbb/parallel_for_each.h>
+#include <zlib.h>
+
+namespace mold {
+
+// This function "forges" a CRC. That is, given the current and a desired
+// CRC32 value, crc32_solve() returns a binary blob to add to the end of
+// the original data to yield the desired CRC. Trailing garbage is ignored
+// by many bianry file formats, so you can create a file with a desired
+// CRC using crc32_solve(). We need it for --separate-debug-file.
+std::vector<u8> crc32_solve(u32 current, u32 desired) {
+  constexpr u32 poly = 0xedb88320;
+  u32 x = ~desired;
+
+  // Each iteration computes x = (x * x^-1) mod poly.
+  for (i64 i = 0; i < 32; i++) {
+    x = std::rotl(x, 1);
+    x ^= (x & 1) * (poly << 1);
+  }
+
+  x ^= ~current;
+
+  std::vector<u8> out(4);
+  out[0] = x;
+  out[1] = x >> 8;
+  out[2] = x >> 16;
+  out[3] = x >> 24;
+  return out;
+}
+
+// Compute a CRC for given data in parallel
+u32 compute_crc32(u32 crc, u8 *buf, i64 len) {
+  struct Shard {
+    u8 *buf;
+    i64 len;
+    u32 crc;
+  };
+
+  constexpr i64 shard_size = 1024 * 1024; // 1 MiB
+  std::vector<Shard> shards;
+
+  while (len > 0) {
+    i64 sz = std::min(len, shard_size);
+    shards.push_back({buf, sz, 0});
+    buf += sz;
+    len -= sz;
+  }
+
+  tbb::parallel_for_each(shards, [](Shard &shard) {
+    shard.crc = crc32(0, shard.buf, shard.len);
+  });
+
+  for (Shard &shard : shards)
+    crc = crc32_combine(crc, shard.crc, shard.len);
+  return crc;
+}
+
+} // namespace mold

lib/demangle.cc

@@ -0,0 +1,42 @@
+#include "lib.h"
+
+#include <cstdlib>
+
+#ifndef _WIN32
+#include <cxxabi.h>
+#endif
+
+#include "../third-party/rust-demangle/rust-demangle.h"
+
+namespace mold {
+
+std::optional<std::string_view> demangle_cpp(std::string_view name) {
+  static thread_local char *buf;
+  static thread_local size_t buflen;
+
+  // TODO(cwasser): Actually demangle Symbols on Windows using e.g.
+  // `UnDecorateSymbolName` from Dbghelp, maybe even Itanium symbols?
+#ifndef _WIN32
+  if (name.starts_with("_Z")) {
+    int status;
+    char *p = abi::__cxa_demangle(std::string(name).c_str(), buf, &buflen, &status);
+    if (status == 0) {
+      buf = p;
+      return p;
+    }
+  }
+#endif
+
+  return {};
+}
+
+std::optional<std::string_view> demangle_rust(std::string_view name) {
+  static thread_local char *buf;
+  free(buf);
+  buf = rust_demangle(std::string(name).c_str(), 0);
+  if (buf)
+    return buf;
+  return {};
+}
+
+} // namespace mold

lib/filepath.cc

@@ -0,0 +1,42 @@
+#include "lib.h"
+
+#include <filesystem>
+#include <sys/stat.h>
+
+#ifdef __APPLE__
+# include <mach-o/dyld.h>
+#endif
+
+#ifdef __FreeBSD__
+# include <sys/sysctl.h>
+#endif
+
+namespace mold {
+
+// Returns the path of the mold executable itself
+std::string get_self_path() {
+#if __APPLE__ || _WIN32
+  fprintf(stderr, "mold: get_self_path is not supported");
+  exit(1);
+#elif __FreeBSD__
+  // /proc may not be mounted on FreeBSD. The proper way to get the
+  // current executable's path is to use sysctl(2).
+  int mib[4];
+  mib[0] = CTL_KERN;
+  mib[1] = KERN_PROC;
+  mib[2] = KERN_PROC_PATHNAME;
+  mib[3] = -1;
+
+  size_t size;
+  sysctl(mib, 4, NULL, &size, NULL, 0);
+
+  std::string path;
+  path.resize(size);
+  sysctl(mib, 4, path.data(), &size, NULL, 0);
+  return path;
+#else
+  return std::filesystem::read_symlink("/proc/self/exe").string();
+#endif
+}
+
+} // namespace mold

lib/gentoo-test.sh

@@ -1,14 +1,14 @@
 #!/bin/bash
 #
 # This test script takes a Gentoo package name and tries to build it
-# using mold in a Docker environment. We chose Gentoo Linux as a test
+# using mold in a Podman environment. We chose Gentoo Linux as a test
 # target, because its source-based package allows us to build programs
 # locally and run their test suites without any hassle.
 #
 # You can get a complete list of Gentoo packages availalbe for testing
 # with the following command:
 #
-# docker run --rm mold-gentoo emerge --color n -s '' | \
+# podman run --rm mold-gentoo emerge --color n -s '' | \
 #   perl -ne 'next unless m!^\*\s+(\S+/\S+)!; print "$1\n"'
 
 package="$1"
@@ -20,47 +20,48 @@ fi
 
 set -x
 
-# Create a Docker image
-if ! docker image ls mold-gentoo | grep -q mold-gentoo; then
+# Create a Podman image
+if ! podman image ls mold-gentoo | grep -q mold-gentoo; then
   set -e
-  cat <<EOF | docker build -t mold-gentoo -
-FROM gentoo/stage3
+  cat <<EOF | podman build -t mold-gentoo -
+FROM docker.io/gentoo/stage3
 RUN emerge-webrsync
-RUN echo 'USE="X ssl elogind -systemd corefonts truetype jpeg jpeg2k tiff zstd static-libs binary"' >> /etc/portage/make.conf && \
+RUN echo 'USE="X ssl elogind -systemd corefonts truetype jpeg jpeg2k tiff zstd static-libs binary -perl"' >> /etc/portage/make.conf && \
     echo 'ACCEPT_KEYWORDS="~amd64"' >> /etc/portage/make.conf && \
     echo 'ACCEPT_LICENSE="* -@EULA"' >> /etc/portage/make.conf && \
     echo 'FEATURES="\${FEATURE} noclean nostrip ccache -ipc-sandbox -network-sandbox -pid-sandbox -sandbox"' >> /etc/portage/make.conf && \
-    echo 'CCACHE_DIR="/ccache"' >> /etc/portage/make.conf
-RUN emerge gdb lld clang vim emacs strace ccache xeyes dev-util/cmake dev-vcs/git && rm -rf /var/tmp/portage
+    echo 'CCACHE_DIR="/ccache"' >> /etc/portage/make.conf && \
+    FEATURES='getbinpkg binpkg-request-signature' emerge gdb lld llvm-core/clang vim emacs strace ccache xeyes dev-build/cmake dev-vcs/git && \
+    rm -rf /var/tmp/portage
 EOF
   set +e
 fi
 
-git_hash=$(./mold --version | perl -ne '/\((\w+)/; print $1;')
+git_hash=$(./dist/mold --version | perl -ne '/\((\w+)/; print $1;')
 
 if [ "$package" = dev-libs/concurrencykit ]; then
   echo "Skipping known broken package: $package"
   exit 0
 fi
 
-# Build a given package in Docker
-cmd1='(cd /usr/bin; ln -sf /mold/mold $(realpath ld))'
+# Build a given package in Podman
+cmd1='(cd /usr/bin; ln -sf /mold/dist/mold $(realpath ld))'
 cmd2="MAKEOPTS=-'j$(nproc) --load-average=100' emerge --onlydeps $package"
 cmd3="MAKEOPTS='-j$(nproc) --load-average=100' FEATURES=test emerge $package"
 filename=`echo "$package" | sed 's!/!_!g'`
-docker="docker run --rm --cap-add=SYS_PTRACE -v `pwd`:/mold -v /var/cache/ccache-gentoo:/ccache mold-gentoo timeout -v -k 15s 1h"
+podman="podman run --rm --pids-limit=-1 --cap-add=SYS_PTRACE -v `pwd`:/mold:ro -v /var/cache/ccache-gentoo:/ccache mold-gentoo timeout -v -k 15s 3h"
 dir=gentoo/$git_hash
 
 mkdir -p "$dir"/success "$dir"/failure
 
-$docker nice -n 19 bash -c "$cmd1 && $cmd2 && $cmd3" >& "$dir"/"$filename".mold
+$podman chrt --idle 0 nice -n 19 bash -c "$cmd1 && $cmd2 && $cmd3" >& "$dir"/"$filename".mold
 if [ $? = 0 ]; then
   mv "$dir"/"$filename".mold "$dir"/success
 else
   mv "$dir"/"$filename".mold "$dir"/failure
 fi
 
-$docker nice -n 19 bash -c "$cmd2 && $cmd3" >& "$dir"/"$filename".ld
+$podman chrt --idle 0 nice -n 19 bash -c "$cmd2 && $cmd3" >& "$dir"/"$filename".ld
 if [ $? = 0 ]; then
   mv "$dir"/"$filename".ld "$dir"/success
 else

lib/glob.cc

@@ -0,0 +1,256 @@
+// This file implements a glob matcher that can run multiple glob patterns
+// against an input string. mold uses the glob matcher for symbol name
+// patterns in a version script or a dynamic list file. Since we may need to
+// match hundreds of glob patterns against millions of symbol names, the
+// speed of the matcher is very important.
+//
+// The pattern match implemented in this file is NFA-based, although the
+// cost of the function is O(n*m), where n is the number of NFA states and m
+// is the length of the input string. We do not use recursion or
+// backtracking, unlike a generic NFA-based regular expression matcher. This
+// is doable because glob patterns are very limited subsets of regexes.
+//
+// Here is the explanation of the algorithm. Observe that the only "tricky"
+// meta-character in a glob pattern is "*", which matches zero or more
+// characters. Other characters and meta-characters always match a single
+// input character. So the key of the algorithm is to handle "*" efficiently.
+//
+// We can represent a glob pattern "a*b*" with three NFA states: q_start, q1
+// and q_accept, with the following transition functions:
+//
+//   δ(q_start, "a") = q1
+//   δ(q1, <any character>) = q1
+//   δ(q1, "b") = q_accept
+//   δ(q_accept, <any character>) = q_accept
+//
+// We can construct such an NFA in a straightforward manner. We maintain NFA
+// states as a list, with the initial contents being the start state. Each
+// character except for "*" creates a new NFA state, adds a transition from
+// the last state in the list to the new one, and appends the new state at
+// the end of the list. "*" sets the "is_star" flag on the last NFA state.
+// The flag indicates that the state machine can remain in the state for any
+// input character.
+//
+// An NFA constructed this way doesn't have any complicated loops,
+// ε-transitions, or anything like that. Each state has only one incoming
+// edge. The only loops in the state transition are the self-loops on states
+// followed by a "*". Aside from that, the state machine progresses linearly
+// from the start state to the accept state.
+//
+// Each state of an NFA can be represented by a single bit. If a bit is 1,
+// the non-deterministic state machine is in that state. Otherwise, it's
+// not. Observe that a state with the "is_star" flag will continued to be 1
+// once it becomes 1, since the state machine can loop over the state on any
+// input character.
+//
+// With that observation, we can represent an NFA with a bit vector of N
+// bits, where N is the number of NFA states. For each input character, bit
+// M becomes 1 if
+//
+//   - bit M-1 is 1 and there's a transition from state_{M-1} to state_M
+//     with the given character, or
+//   - bit M is 1 and state_M's "is_star" flag is 1.
+//
+// Initially, the 0th bit is 1 for the start state. At each step, the bits
+// propagate from least significant to most significant positions, at most
+// one bit at a time. If the most significant bit is 1 after the entire
+// input has been processed, the string matches.
+//
+// This propagation can be implemented with bitwise OR, bitwise AND, and a
+// one-bit bit shift on the bit vector. All these operations are very cheap.
+//
+// We can combine multiple glob matchers into a single matcher by simply
+// concatenating the bit vectors of their state machines.
+
+#include "lib.h"
+
+#include <cstring>
+
+namespace mold {
+
+static std::vector<MultiGlob::State> parse_glob(std::string_view pat) {
+  std::vector<MultiGlob::State> vec(1);
+
+  while (!pat.empty()) {
+    u8 c = pat[0];
+    pat = pat.substr(1);
+    std::bitset<256> chars;
+
+    switch (c) {
+    case '*':
+      vec.back().is_star = true;
+      continue;
+    case '?':
+      chars.set();
+      break;
+    case '\\':
+      if (pat.empty())
+        return {};
+      chars[pat[0]] = true;
+      pat = pat.substr(1);
+      break;
+    case '[': {
+      // Here are a few bracket pattern examples:
+      //
+      // [abc]: a, b or c
+      // [$\]!]: $, ] or !
+      // [a-czg-i]: a, b, c, z, g, h, or i
+      // [!a-z]: Any character except lowercase letters
+      //
+      // Both `!` and `^` are accepted as negation markers. `!` is the
+      // POSIX/shell convention used by other linkers. `^` was mold's
+      // original syntax and is kept for backward compatibility.
+      bool negate = false;
+      bool closed = false;
+
+      if (!pat.empty() && (pat[0] == '!' || pat[0] == '^')) {
+        negate = true;
+        pat = pat.substr(1);
+      }
+
+      while (!pat.empty()) {
+        if (pat[0] == ']') {
+          pat = pat.substr(1);
+          closed = true;
+          break;
+        }
+
+        if (pat[0] == '\\') {
+          pat = pat.substr(1);
+          if (pat.empty())
+            return {};
+        }
+
+        if (pat.size() >= 3 && pat[1] == '-') {
+          u8 start = pat[0];
+          u8 end = pat[2];
+          pat = pat.substr(3);
+
+          if (end == '\\') {
+            if (pat.empty())
+              return {};
+            end = pat[0];
+            pat = pat.substr(1);
+          }
+
+          if (end < start)
+            return {};
+
+          for (i64 i = start; i <= end; i++)
+            chars[i] = true;
+        } else {
+          chars[pat[0]] = true;
+          pat = pat.substr(1);
+        }
+      }
+
+      if (!closed)
+        return {};
+
+      if (negate)
+        chars.flip();
+      break;
+    }
+    default:
+      chars[c] = true;
+      break;
+    }
+
+    vec.push_back({chars, false});
+  }
+  return vec;
+}
+
+// Instead of returning just a match/no match boolean value, our glob
+// matcher returns an integer value associated with each given pattern.
+// If multiple patterns match at the same time, the largest associated
+// value will be returned by find().
+bool MultiGlob::add(std::string_view pat, i64 val) {
+  std::vector<State> vec = parse_glob(pat);
+  if (vec.empty())
+    return false;
+  patterns.push_back({std::move(vec), val});
+  return true;
+}
+
+void MultiGlob::compile() {
+  if (patterns.empty())
+    return;
+
+  ranges::stable_sort(patterns, ranges::greater(), &GlobPattern::value);
+
+  std::vector<State> states;
+  for (GlobPattern &p : patterns)
+    append(states, p.states);
+  i64 sz = states.size();
+
+  start_states.resize(sz);
+  for (i64 pos = 0; GlobPattern &p : patterns) {
+    start_states[pos] = true;
+    pos += p.states.size();
+  }
+
+  star_mask.resize(sz);
+  for (i64 i = 0; i < sz; i++)
+    if (states[i].is_star)
+      star_mask[i] = true;
+
+  for (i64 i = 0; i < 256; i++) {
+    char_mask[i].resize(sz);
+    for (i64 j = 0; j < sz; j++)
+      if (states[j].incoming_edge[i])
+        char_mask[i][j] = true;
+  }
+}
+
+i64 MultiGlob::find(std::string_view str) {
+  if (patterns.empty())
+    return -1;
+
+  Bitvector bits = start_states;
+  Bitvector tmp;
+
+  for (u8 c : str) {
+    // This is equivalent to
+    //
+    //   bits = (bits & star_mask) | ((bits << 1) & char_mask[c])
+    //
+    // but we update the existing objects in place to avoid allocating
+    // temporary objects.
+    tmp = bits;
+    tmp &= star_mask;
+    bits <<= 1;
+    bits &= char_mask[c];
+    bits |= tmp;
+  }
+
+  for (i64 pos = 0; GlobPattern &p : patterns) {
+    pos += p.states.size();
+    if (bits[pos - 1])
+      return p.value;
+  }
+  return -1;
+}
+
+bool Glob::add(std::string_view pat, i64 val) {
+  assert(val >= 0);
+  assert(!is_compiled);
+
+  // If the pattern requires only a single substring search, the
+  // Aho-Corasick algorithm is even faster than our glob matcher.
+  if (aho_corasick.can_handle(pat))
+    return aho_corasick.add(pat, val);
+  return multi_glob.add(pat, val);
+}
+
+i64 Glob::find(std::string_view str) {
+  std::call_once(once, [&] {
+    multi_glob.compile();
+    aho_corasick.compile();
+    is_compiled = true;
+  });
+
+  return std::max(multi_glob.find(str), aho_corasick.find(str));
+}
+
+} // namespace mold

lib/hyperloglog.cc

@@ -4,7 +4,7 @@
 // For more info, read
 // https://engineering.fb.com/2018/12/13/data-infrastructure/hyperloglog
 
-#include "mold.h"
+#include "lib.h"
 
 #include <cmath>
 
@@ -13,7 +13,7 @@ namespace mold {
 i64 HyperLogLog::get_cardinality() const {
   double z = 0;
   for (i64 val : buckets)
-    z += pow(2, -val);
+    z += std::ldexp(1.0, -val);
   return ALPHA * NBUCKETS * NBUCKETS / z;
 }
 

lib/integers.h

@@ -0,0 +1,127 @@
+// This file defines integral types for file input/output. We need to use
+// these types instead of the plain integers (such as uint32_t or int32_t)
+// when reading from/writing to an mmap'ed file area for the following
+// reasons:
+//
+// 1. mold is always a cross linker and should not depend on what host it
+//    is running on. For example, users should be able to run mold on a
+//    little-endian x86 machine to create a big-endian s390x binary.
+//
+// 2. Even though data members in all ELF data strucutres are naturally
+//    aligned, they are not guaranteed to be aligned on memory because of
+//    archive files. Archive files (.a files) align each file only to a
+//    2 byte boundary, so anything larger than 2 bytes may be misaligned
+//    in an mmap'ed memory. Misaligned access is an undefined behavior in
+//    C/C++, so we shouldn't cast an arbitrary pointer to a uint32_t, for
+//    example, to read a 32 bit value.
+//
+// The data types defined in this file are independent of the host byte
+// order and are designed to avoid unaligned access.
+//
+// Note that in C/C++, memcpy is a portable and efficient way to access
+// unaligned data, as it is typically treated as an intrinsic. Compilers
+// can easily optimize memcpy calls in this file into a single load or
+// store instruction.
+
+#pragma once
+
+#include <bit>
+#include <cstdint>
+#include <cstring>
+#include <type_traits>
+
+#if !defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
+# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#  define __LITTLE_ENDIAN__ 1
+# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#  define __BIG_ENDIAN__ 1
+# else
+#  error "unknown host byte order"
+# endif
+#endif
+
+namespace mold {
+
+template <typename T, bool is_le, int size = sizeof(T)>
+class Integer {
+public:
+  constexpr Integer() = default;
+
+  constexpr Integer(T v) {
+    if (std::is_constant_evaluated() || size == 3) {
+      for (int i = 0; i < size; i++)
+        buf[is_le ? i : (size - i - 1)] = v >> (i * 8);
+    } else {
+      if (!is_native)
+        v = bswap(v);
+      memcpy(buf, &v, size);
+    }
+  }
+
+  operator T() const {
+    if (size == 3) {
+      if (is_le)
+        return buf[2] << 16 | buf[1] << 8 | buf[0];
+      return buf[0] << 16 | buf[1] << 8 | buf[2];
+    }
+
+    T v;
+    memcpy(&v, buf, size);
+    return is_native ? v : bswap(v);
+  }
+
+  Integer &operator=(T v)  { new (this) Integer(v); return *this; }
+  Integer &operator++()    { return *this = *this + 1; }
+  Integer operator++(int)  { auto x = *this; ++*this; return x; }
+  Integer &operator--()    { return *this = *this - 1; }
+  Integer operator--(int)  { auto x = *this; --*this; return x; }
+  Integer &operator+=(T v) { return *this = *this + v; }
+  Integer &operator-=(T v) { return *this = *this - v; }
+  Integer &operator&=(T v) { return *this = *this & v; }
+  Integer &operator|=(T v) { return *this = *this | v; }
+
+private:
+  static constexpr bool is_native =
+    (std::endian::native == (is_le ? std::endian::little : std::endian::big));
+
+  static T bswap(T v) {
+    switch (size) {
+    case 2: return __builtin_bswap16(v);
+    case 4: return __builtin_bswap32(v);
+    case 8: return __builtin_bswap64(v);
+    default: __builtin_unreachable();
+    }
+  }
+
+  uint8_t buf[size];
+};
+
+using i8 = int8_t;
+using i16 = int16_t;
+using i32 = int32_t;
+using i64 = int64_t;
+
+using u8 = uint8_t;
+using u16 = uint16_t;
+using u32 = uint32_t;
+using u64 = uint64_t;
+
+using il16 = Integer<i16, true>;
+using il32 = Integer<i32, true>;
+using il64 = Integer<i64, true>;
+
+using ul16 = Integer<u16, true>;
+using ul24 = Integer<u32, true, 3>;
+using ul32 = Integer<u32, true>;
+using ul64 = Integer<u64, true>;
+
+using ib16 = Integer<i16, false>;
+using ib32 = Integer<i32, false>;
+using ib64 = Integer<i64, false>;
+
+using ub16 = Integer<u16, false>;
+using ub24 = Integer<u32, false, 3>;
+using ub32 = Integer<u32, false>;
+using ub64 = Integer<u64, false>;
+
+} // namespace mold

lib/lib.h

@@ -0,0 +1,709 @@
+#pragma once
+
+#include "atomics.h"
+#include "integers.h"
+#include "bitvector.h"
+
+#include <array>
+#include <atomic>
+#include <bit>
+#include <bitset>
+#include <cassert>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <fcntl.h>
+#include <filesystem>
+#include <iostream>
+#include <mutex>
+#include <optional>
+#include <span>
+#include <sstream>
+#include <string>
+#include <string_view>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <tbb/concurrent_vector.h>
+#include <tbb/enumerable_thread_specific.h>
+#include <tbb/parallel_for.h>
+#include <vector>
+
+#ifdef _WIN32
+# include <io.h>
+#else
+# include <sys/mman.h>
+# include <unistd.h>
+#endif
+
+#define XXH_INLINE_ALL 1
+#include "../third-party/xxhash/xxhash.h"
+
+#ifdef NDEBUG
+# define unreachable() __builtin_unreachable()
+#else
+# define unreachable() assert(0 && "unreachable")
+#endif
+
+inline uint64_t hash_string(std::string_view str) {
+  return XXH3_64bits(str.data(), str.size());
+}
+
+class HashCmp {
+public:
+  static size_t hash(const std::string_view &k) {
+    return hash_string(k);
+  }
+
+  static bool equal(const std::string_view &k1, const std::string_view &k2) {
+    return k1 == k2;
+  }
+};
+
+namespace mold {
+
+namespace ranges = std::ranges;
+using namespace std::literals::string_literals;
+using namespace std::literals::string_view_literals;
+
+inline u64 combine_hash(u64 a, u64 b) {
+  return a ^ (b + 0x9e3779b9 + (a << 6) + (a >> 2));
+}
+
+//
+// perf.cc
+//
+
+// Counter is used to collect statistics numbers.
+class Counter {
+public:
+  Counter(std::string_view name, i64 value = 0) : name(name), values(value) {
+    static std::mutex mu;
+    std::scoped_lock lock(mu);
+    instances.push_back(this);
+  }
+
+  Counter &operator++(int) {
+    if (enabled) [[unlikely]]
+      values.local()++;
+    return *this;
+  }
+
+  Counter &operator+=(int delta) {
+    if (enabled) [[unlikely]]
+      values.local() += delta;
+    return *this;
+  }
+
+  static void print();
+
+  static inline bool enabled = false;
+
+private:
+  i64 get_value();
+
+  std::string_view name;
+  tbb::enumerable_thread_specific<i64> values;
+
+  static inline std::vector<Counter *> instances;
+};
+
+// Timer and TimeRecord records elapsed time (wall clock time)
+// used by each pass of the linker.
+struct TimerRecord {
+  TimerRecord(std::string name, TimerRecord *parent = nullptr);
+  void stop();
+
+  std::string name;
+  TimerRecord *parent;
+  tbb::concurrent_vector<TimerRecord *> children;
+  i64 start;
+  i64 end;
+  i64 user;
+  i64 sys;
+  bool stopped = false;
+};
+
+void
+print_timer_records(tbb::concurrent_vector<std::unique_ptr<TimerRecord>> &);
+
+template <typename Context>
+class Timer {
+public:
+  Timer(Context &ctx, std::string name, Timer *parent = nullptr) {
+    record = new TimerRecord(name, parent ? parent->record : nullptr);
+    ctx.timer_records.emplace_back(record);
+  }
+
+  Timer(const Timer &) = delete;
+
+  ~Timer() {
+    record->stop();
+  }
+
+  void stop() {
+    record->stop();
+  }
+
+private:
+  TimerRecord *record;
+};
+
+//
+// Utility functions
+//
+
+// Some C++ libraries haven't implemented std::has_single_bit yet.
+inline bool has_single_bit(u64 val) {
+  return std::popcount(val) == 1;
+}
+
+// Some C++ libraries haven't implemented std::bit_ceil yet.
+inline u64 bit_ceil(u64 val) {
+  if (has_single_bit(val))
+    return val;
+  return 1LL << (64 - std::countl_zero(val));
+}
+
+inline u64 align_to(u64 val, u64 align) {
+  if (align == 0)
+    return val;
+  assert(has_single_bit(align));
+  return (val + align - 1) & ~(align - 1);
+}
+
+inline u64 align_down(u64 val, u64 align) {
+  assert(has_single_bit(align));
+  return val & ~(align - 1);
+}
+
+inline u64 bit(u64 val, i64 pos) {
+  return (val >> pos) & 1;
+};
+
+// Returns [hi:lo] bits of val.
+inline u64 bits(u64 val, u64 hi, u64 lo) {
+  return (val >> lo) & ((1LL << (hi - lo + 1)) - 1);
+}
+
+// Cast val to a signed N bit integer.
+// For example, sign_extend(x, 32) == (i32)x for any integer x.
+inline i64 sign_extend(u64 val, i64 n) {
+  return (i64)(val << (64 - n)) >> (64 - n);
+}
+
+inline bool is_int(u64 val, i64 n) {
+  return sign_extend(val, n) == val;
+}
+
+template <typename T, typename Compare = std::less<T>>
+void update_minimum(std::atomic<T> &atomic, u64 new_val, Compare cmp = {}) {
+  T old_val = atomic.load(std::memory_order_relaxed);
+  while (cmp(new_val, old_val) &&
+         !atomic.compare_exchange_weak(old_val, new_val,
+                                       std::memory_order_relaxed));
+}
+
+template <typename T, typename Compare = std::less<T>>
+void update_maximum(std::atomic<T> &atomic, u64 new_val, Compare cmp = {}) {
+  T old_val = atomic.load(std::memory_order_relaxed);
+  while (cmp(old_val, new_val) &&
+         !atomic.compare_exchange_weak(old_val, new_val,
+                                       std::memory_order_relaxed));
+}
+
+template <typename T>
+inline void append(std::vector<T> &x, const auto &y) {
+  x.insert(x.end(), y.begin(), y.end());
+}
+
+template <typename T>
+inline std::vector<T> flatten(std::vector<std::vector<T>> &vec) {
+  i64 size = 0;
+  for (std::vector<T> &v : vec)
+    size += v.size();
+
+  std::vector<T> ret;
+  ret.reserve(size);
+  for (std::vector<T> &v : vec)
+    append(ret, v);
+  return ret;
+}
+
+template <typename T>
+inline void remove_duplicates(std::vector<T> &vec) {
+  vec.erase(std::unique(vec.begin(), vec.end()), vec.end());
+}
+
+inline i64 write_string(void *buf, std::string_view str) {
+  memcpy(buf, str.data(), str.size());
+  *((u8 *)buf + str.size()) = '\0';
+  return str.size() + 1;
+}
+
+template <typename T>
+inline void write_vector(void *buf, const std::vector<T> &vec) {
+  if (!vec.empty())
+    memcpy(buf, vec.data(), vec.size() * sizeof(T));
+}
+
+inline void encode_uleb(std::vector<u8> &vec, u64 val) {
+  do {
+    u8 byte = val & 0x7f;
+    val >>= 7;
+    vec.push_back(val ? (byte | 0x80) : byte);
+  } while (val);
+}
+
+inline void encode_sleb(std::vector<u8> &vec, i64 val) {
+  for (;;) {
+    u8 byte = val & 0x7f;
+    val >>= 7;
+
+    bool neg = (byte & 0x40);
+    if ((val == 0 && !neg) || (val == -1 && neg)) {
+      vec.push_back(byte);
+      break;
+    }
+    vec.push_back(byte | 0x80);
+  }
+}
+
+inline i64 write_uleb(u8 *buf, u64 val) {
+  i64 i = 0;
+  do {
+    u8 byte = val & 0x7f;
+    val >>= 7;
+    buf[i++] = val ? (byte | 0x80) : byte;
+  } while (val);
+  return i;
+}
+
+inline u64 read_uleb(u8 **buf) {
+  u64 val = 0;
+  u8 shift = 0;
+  u8 byte;
+  do {
+    byte = *(*buf)++;
+    val |= (byte & 0x7f) << shift;
+    shift += 7;
+  } while (byte & 0x80);
+  return val;
+}
+
+inline u64 read_uleb(u8 *buf) {
+  u8 *tmp = buf;
+  return read_uleb(&tmp);
+}
+
+inline i64 read_sleb(u8 **buf) {
+  u64 val = 0;
+  u8 shift = 0;
+  u8 byte;
+  do {
+    byte = *(*buf)++;
+    val |= (byte & 0x7f) << shift;
+    shift += 7;
+  } while (byte & 0x80);
+  return sign_extend(val, shift);
+}
+
+inline i64 read_sleb(u8 *buf) {
+  u8 *tmp = buf;
+  return read_sleb(&tmp);
+}
+
+inline u64 read_uleb(std::string_view *str) {
+  u8 *start = (u8 *)str->data();
+  u8 *ptr = start;
+  u64 val = read_uleb(&ptr);
+  *str = str->substr(ptr - start);
+  return val;
+}
+
+inline u64 read_uleb(std::string_view str) {
+  std::string_view tmp = str;
+  return read_uleb(&tmp);
+}
+
+inline i64 uleb_size(u64 val) {
+  for (int i = 1; i < 9; i++)
+    if (val < (1LL << (7 * i)))
+      return i;
+  return 9;
+}
+
+inline void overwrite_uleb(u8 *loc, u64 val) {
+  while (*loc & 0b1000'0000) {
+    *loc++ = 0b1000'0000 | (val & 0b0111'1111);
+    val >>= 7;
+  }
+  *loc = val & 0b0111'1111;
+}
+
+static inline void pause() {
+#if defined(__x86_64__)
+  asm volatile("pause");
+#elif defined(__aarch64__)
+  asm volatile("yield");
+#elif defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_8A__)
+  asm volatile("yield");
+#endif
+}
+
+//
+// Concurrent Map
+//
+
+// This is an implementation of a fast concurrent hash map. Unlike
+// ordinary hash tables, this impl just aborts if it becomes full.
+// So you need to give a correct estimation of the final size before
+// using it. We use this hash map to uniquify pieces of data in
+// mergeable sections.
+//
+// We've implemented this ourselves because the performance of
+// conrurent hash map is critical for our linker.
+template <typename T>
+class ConcurrentMap {
+public:
+  ConcurrentMap() = default;
+
+  ConcurrentMap(i64 nbuckets) {
+    resize(nbuckets);
+  }
+
+  ~ConcurrentMap() {
+    if (entries) {
+#ifdef _WIN32
+      _aligned_free(entries);
+#else
+      munmap(entries, sizeof(Entry) * nbuckets);
+#endif
+    }
+  }
+
+  // In order to avoid unnecessary cache-line false sharing, we want
+  // to make this object to be aligned to a reasonably large
+  // power-of-two address.
+  struct alignas(32) Entry {
+    Atomic<const char *> key;
+    u32 keylen;
+    T value;
+  };
+
+  void resize(i64 nbuckets) {
+    assert(!entries);
+    this->nbuckets = std::max<i64>(MIN_NBUCKETS, bit_ceil(nbuckets));
+    i64 bufsize = sizeof(Entry) * this->nbuckets;
+
+    // Allocate a zero-initialized buffer. mmap() is faster than
+    // malloc()+memset(), and MAP_POPULATE pre-faults pages here to
+    // avoid CoW faults and TLB shootdowns under concurrent inserts.
+#ifdef _WIN32
+    entries = (Entry *)_aligned_malloc(bufsize, alignof(Entry));
+    memset((void *)entries, 0, bufsize);
+#elif MAP_POPULATE
+    entries = (Entry *)mmap(nullptr, bufsize, PROT_READ | PROT_WRITE,
+                            MAP_ANONYMOUS | MAP_PRIVATE | MAP_POPULATE, -1, 0);
+#else
+    entries = (Entry *)mmap(nullptr, bufsize, PROT_READ | PROT_WRITE,
+                            MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+#endif
+  }
+
+  std::pair<T *, bool> insert(std::string_view key, u64 hash, const T &val) {
+    assert(has_single_bit(nbuckets));
+
+    u64 begin = hash & (nbuckets - 1);
+    u64 mask = nbuckets / NUM_SHARDS - 1;
+
+    for (i64 i = 0; i < MAX_RETRY; i++) {
+      u64 idx = (begin & ~mask) | ((begin + i) & mask);
+      Entry &ent = entries[idx];
+
+      // It seems avoiding compare-and-swap is faster overall at least
+      // on my Zen4 machine, so do it.
+      if (const char *ptr = ent.key.load(std::memory_order_acquire);
+          ptr != nullptr && ptr != (char *)-1) {
+        if (key == std::string_view(ptr, ent.keylen))
+          return {&ent.value, false};
+        continue;
+      }
+
+      // Otherwise, use CAS to atomically claim the ownership of the slot.
+      const char *ptr = nullptr;
+      bool claimed = ent.key.compare_exchange_strong(ptr, (char *)-1,
+                                                     std::memory_order_acquire);
+
+      // If we successfully claimed the ownership of the slot,
+      // copy values to it.
+      if (claimed) {
+        new (&ent.value) T(val);
+        ent.keylen = key.size();
+        ent.key.store(key.data(), std::memory_order_release);
+        return {&ent.value, true};
+      }
+
+      // If someone is copying values to the slot, do busy wait.
+      while (ptr == (char *)-1) {
+        pause();
+        ptr = ent.key.load(std::memory_order_acquire);
+      }
+
+      // If the same key is already present, this is the slot we are
+      // looking for.
+      if (key == std::string_view(ptr, ent.keylen))
+        return {&ent.value, false};
+    }
+
+    std::cerr << "ConcurrentMap is full\n";
+    abort();
+  }
+
+  i64 get_idx(T *value) const {
+    uintptr_t addr = (uintptr_t)value - (uintptr_t)value % sizeof(Entry);
+    return (Entry *)addr - entries;
+  }
+
+  // Return a list of map entries sorted in a deterministic order.
+  std::vector<Entry *> get_sorted_entries(i64 shard_idx) {
+    if (nbuckets == 0)
+      return {};
+
+    i64 shard_size = nbuckets / NUM_SHARDS;
+    i64 begin = shard_idx * shard_size;
+    i64 end = begin + shard_size;
+
+    i64 sz = 0;
+    for (i64 i = begin; i < end; i++)
+      if (entries[i].key)
+        sz++;
+
+    std::vector<Entry *> vec;
+    vec.reserve(sz);
+
+    // Since the shard is circular, we need to handle the last entries
+    // as if they were next to the first entries.
+    while (begin < end && entries[end - 1].key)
+      vec.push_back(entries + --end);
+
+    // Find entries contiguous in the buckets and sort them.
+    i64 last = 0;
+    for (i64 i = begin; i < end;) {
+      while (i < end && entries[i].key)
+        vec.push_back(entries + i++);
+
+      std::sort(vec.begin() + last, vec.end(), [](Entry *a, Entry *b) {
+        if (a->keylen != b->keylen)
+          return a->keylen < b->keylen;
+        return memcmp(a->key, b->key, a->keylen) < 0;
+      });
+
+      last = vec.size();
+
+      while (i < end && !entries[i].key)
+        i++;
+    }
+    return vec;
+  }
+
+  std::vector<Entry *> get_sorted_entries_all() {
+    std::vector<std::vector<Entry *>> vec(NUM_SHARDS);
+    tbb::parallel_for((i64)0, NUM_SHARDS, [&](i64 i) {
+      vec[i] = get_sorted_entries(i);
+    });
+    return flatten(vec);
+  }
+
+  static constexpr i64 MIN_NBUCKETS = 4096;
+  static constexpr i64 NUM_SHARDS = 16;
+  static constexpr i64 MAX_RETRY = 256;
+
+  Entry *entries = nullptr;
+  u64 nbuckets = 0;
+};
+
+//
+// random.cc
+//
+
+void get_random_bytes(u8 *buf, i64 size);
+
+//
+// hyperloglog.cc
+//
+
+class HyperLogLog {
+public:
+  void insert(u64 hash) {
+    update_maximum(buckets[hash & (NBUCKETS - 1)], std::countl_zero(hash) + 1);
+  }
+
+  i64 get_cardinality() const;
+
+  void merge(const HyperLogLog &other) {
+    for (i64 i = 0; i < NBUCKETS; i++)
+      update_maximum(buckets[i], other.buckets[i]);
+  }
+
+private:
+  static constexpr i64 NBUCKETS = 2048;
+  static constexpr double ALPHA = 0.79402;
+
+  Atomic<u8> buckets[NBUCKETS];
+};
+
+//
+// aho-corasick.cc
+//
+
+class AhoCorasick {
+public:
+  bool add(std::string_view pat, i64 val);
+  bool empty() const { return nodes.empty(); }
+  void compile();
+  i64 find(std::string_view str);
+
+  static bool can_handle(std::string_view str);
+
+private:
+  struct TrieNode {
+    TrieNode() { children.fill(-1); }
+    i64 value = -1;
+    i32 suffix_link = -1;
+    std::array<i32, 256> children;
+  };
+
+  void fix_suffix_links(i64 idx);
+  void fix_values();
+
+  std::vector<TrieNode> nodes;
+};
+
+//
+// glob.cc
+//
+
+class MultiGlob {
+public:
+  bool add(std::string_view pat, i64 val);
+  bool empty() const { return patterns.empty(); }
+  void compile();
+  i64 find(std::string_view str);
+
+  struct State {
+    std::bitset<256> incoming_edge;
+    bool is_star = false;
+  };
+
+  struct GlobPattern {
+    std::vector<State> states;
+    i64 value = -1;
+  };
+
+private:
+  std::vector<GlobPattern> patterns;
+  Bitvector start_states;
+  Bitvector star_mask;
+  Bitvector char_mask[256];
+};
+
+class Glob {
+public:
+  bool add(std::string_view pat, i64 val);
+  bool empty() const { return multi_glob.empty() && aho_corasick.empty(); }
+  i64 find(std::string_view str);
+
+private:
+  std::once_flag once;
+  bool is_compiled = false;
+
+  MultiGlob multi_glob;
+  AhoCorasick aho_corasick;
+};
+
+//
+// filepath.cc
+//
+
+inline std::filesystem::path path_dirname(std::string_view path) {
+  return std::filesystem::path(path).parent_path();
+}
+
+inline std::string path_filename(std::string_view path) {
+  return std::filesystem::path(path).filename().string();
+}
+
+inline std::string path_clean(std::string_view path) {
+  return std::filesystem::path(path).lexically_normal().string();
+}
+
+std::string get_self_path();
+
+//
+// demangle.cc
+//
+
+std::optional<std::string_view> demangle_cpp(std::string_view name);
+std::optional<std::string_view> demangle_rust(std::string_view name);
+
+//
+// crc32.cc
+//
+
+u32 compute_crc32(u32 crc, u8 *buf, i64 len);
+std::vector<u8> crc32_solve(u32 current, u32 desired);
+
+//
+// compress.cc
+//
+
+class Compressor {
+public:
+  virtual void write_to(u8 *buf) = 0;
+  virtual ~Compressor();
+  i64 compressed_size = 0;
+
+protected:
+  std::vector<std::span<u8>> shards;
+};
+
+class ZlibCompressor : public Compressor {
+public:
+  ZlibCompressor(u8 *buf, i64 size, i64 level);
+  void write_to(u8 *buf) override;
+
+private:
+  u32 checksum = 0;
+};
+
+class ZstdCompressor : public Compressor {
+public:
+  ZstdCompressor(u8 *buf, i64 size, i64 level);
+  void write_to(u8 *buf) override;
+};
+
+//
+// tar.cc
+//
+
+// TarFile is a class to create a tar file.
+//
+// If you pass `--repro` to mold, mold collects all input files and
+// put them into `<output-file-path>.repro.tar`, so that it is easy to
+// run the same command with the same command line arguments.
+class TarWriter {
+public:
+  static std::unique_ptr<TarWriter>
+  open(std::string output_path, std::string basedir);
+
+  ~TarWriter();
+  void append(std::string path, std::string_view data);
+
+private:
+  TarWriter(FILE *out, std::string basedir) : out(out), basedir(basedir) {}
+
+  FILE *out = nullptr;
+  std::string basedir;
+};
+
+} // namespace mold

lib/perf.cc

@@ -1,10 +1,13 @@
-#include "mold.h"
+#include "lib.h"
 
 #include <functional>
 #include <iomanip>
 #include <ios>
+#include <tbb/concurrent_vector.h>
 
-#ifndef _WIN32
+#ifdef _WIN32
+#include <windows.h>
+#else
 #include <sys/resource.h>
 #include <sys/time.h>
 #endif
@@ -16,9 +19,7 @@ i64 Counter::get_value() {
 }
 
 void Counter::print() {
-  sort(instances, [](Counter *a, Counter *b) {
-    return a->get_value() > b->get_value();
-  });
+  ranges::stable_sort(instances, {}, [](Counter *x) { return x->get_value(); });
 
   for (Counter *c : instances)
     std::cout << std::setw(20) << std::right << c->name
@@ -26,19 +27,13 @@ void Counter::print() {
 }
 
 static i64 now_nsec() {
-#ifdef _WIN32
   return (i64)std::chrono::steady_clock::now().time_since_epoch().count();
-#else
-  struct timespec t;
-  clock_gettime(CLOCK_MONOTONIC, &t);
-  return (i64)t.tv_sec * 1000000000 + t.tv_nsec;
-#endif
 }
 
 static std::pair<i64, i64> get_usage() {
 #ifdef _WIN32
   auto to_nsec = [](FILETIME t) -> i64 {
-    return ((u64)t.dwHighDateTime << 32 + (u64)t.dwLowDateTime) * 100;
+    return (((u64)t.dwHighDateTime << 32) + (u64)t.dwLowDateTime) * 100;
   };
 
   FILETIME creation, exit, kernel, user;
@@ -46,7 +41,7 @@ static std::pair<i64, i64> get_usage() {
   return {to_nsec(user), to_nsec(kernel)};
 #else
   auto to_nsec = [](struct timeval t) -> i64 {
-    return (i64)t.tv_sec * 1000000000 + t.tv_usec * 1000;
+    return (i64)t.tv_sec * 1'000'000'000 + t.tv_usec * 1'000;
   };
 
   struct rusage ru;
@@ -79,15 +74,13 @@ void TimerRecord::stop() {
 
 static void print_rec(TimerRecord &rec, i64 indent) {
   printf(" % 8.3f % 8.3f % 8.3f  %s%s\n",
-         ((double)rec.user / 1000000000),
-         ((double)rec.sys / 1000000000),
-         (((double)rec.end - rec.start) / 1000000000),
+         ((double)rec.user / 1'000'000'000),
+         ((double)rec.sys / 1'000'000'000),
+         (((double)rec.end - rec.start) / 1'000'000'000),
          std::string(indent * 2, ' ').c_str(),
          rec.name.c_str());
 
-  sort(rec.children, [](TimerRecord *a, TimerRecord *b) {
-    return a->start < b->start;
-  });
+  ranges::stable_sort(rec.children, {}, &TimerRecord::start);
 
   for (TimerRecord *child : rec.children)
     print_rec(*child, indent + 1);

lib/random.cc

@@ -0,0 +1,20 @@
+#include "lib.h"
+
+#include <random>
+
+namespace mold {
+
+void get_random_bytes(u8 *buf, i64 size) {
+  std::random_device rand;
+  i64 i = 0;
+
+  for (; i < size - 4; i += 4) {
+    u32 val = rand();
+    memcpy(buf + i, &val, 4);
+  }
+
+  u32 val = rand();
+  memcpy(buf + i, &val, size - i);
+}
+
+} // namespace mold

lib/siphash.h

@@ -0,0 +1,144 @@
+// This is a header-only C++20 implementation of SipHash based on the
+// reference implementation. To use, just copy this header file into
+// your project and #include it.
+//
+// https://github.com/rui314/siphash/blob/main/siphash.h
+
+#include <bit>
+#include <cstdint>
+#include <cstring>
+
+template <int C_ROUNDS, int D_ROUNDS, int OUTLEN>
+class SipHashTmpl {
+public:
+  static_assert(OUTLEN == 64 || OUTLEN == 128);
+
+  SipHashTmpl(void *key) {
+    uint64_t k0 = read64(key);
+    uint64_t k1 = read64((char *)key + 8);
+
+    v0 = 0x736f6d6570736575 ^ k0;
+    v1 = 0x646f72616e646f6d ^ k1;
+    v2 = 0x6c7967656e657261 ^ k0;
+    v3 = 0x7465646279746573 ^ k1;
+
+    if (OUTLEN == 128)
+      v1 ^= 0xee;
+  }
+
+  void update(void *msgp, int64_t msglen) {
+    char *msg = (char *)msgp;
+    sum += msglen;
+
+    if (buflen) {
+      if (buflen + msglen < 8) {
+        memcpy(buf + buflen, msg, msglen);
+        buflen += msglen;
+        return;
+      }
+
+      int j = 8 - buflen;
+      memcpy(buf + buflen, msg, j);
+      compress(read64(buf));
+
+      msg += j;
+      msglen -= j;
+      buflen = 0;
+    }
+
+    while (msglen >= 8) {
+      compress(read64(msg));
+      msg += 8;
+      msglen -= 8;
+    }
+
+    memcpy(buf, msg, msglen);
+    buflen = msglen;
+  }
+
+  void finish(void *out) {
+    memset(buf + buflen, 0, 8 - buflen);
+    compress(((uint64_t)sum << 56) | read64(buf));
+
+    v2 ^= (OUTLEN == 128) ? 0xee : 0xff;
+    finalize();
+    write64(out, v0 ^ v1 ^ v2 ^ v3);
+
+    if (OUTLEN == 128) {
+      v1 ^= 0xdd;
+      finalize();
+      write64((char *)out + 8, v0 ^ v1 ^ v2 ^ v3);
+    }
+  }
+
+  static void hash(void *out, void *key, void *in, int inlen) {
+    SipHashTmpl<C_ROUNDS, D_ROUNDS, OUTLEN> h(key);
+    h.update(in, inlen);
+    h.finish(out);
+  }
+
+private:
+  uint64_t v0, v1, v2, v3;
+  uint8_t buf[8];
+  uint8_t buflen = 0;
+  uint8_t sum = 0;
+
+  uint64_t read64(void *loc) {
+    uint64_t val;
+    memcpy(&val, loc, 8);
+    if (std::endian::native == std::endian::big)
+      val = bswap(val);
+    return val;
+  }
+
+  void write64(void *loc, uint64_t val) {
+    if (std::endian::native == std::endian::big)
+      val = bswap(val);
+    memcpy(loc, &val, 8);
+  }
+
+  uint64_t bswap(uint64_t val) {
+    return ((val << 56) & 0xff00000000000000) |
+           ((val << 40) & 0x00ff000000000000) |
+           ((val << 24) & 0x0000ff0000000000) |
+           ((val << 8)  & 0x000000ff00000000) |
+           ((val >> 8)  & 0x00000000ff000000) |
+           ((val >> 24) & 0x0000000000ff0000) |
+           ((val >> 40) & 0x000000000000ff00) |
+           ((val >> 56) & 0x00000000000000ff);
+  }
+
+  void round() {
+    v0 += v1;
+    v1 = std::rotl(v1, 13);
+    v1 ^= v0;
+    v0 = std::rotl(v0, 32);
+    v2 += v3;
+    v3 = std::rotl(v3, 16);
+    v3 ^= v2;
+    v0 += v3;
+    v3 = std::rotl(v3, 21);
+    v3 ^= v0;
+    v2 += v1;
+    v1 = std::rotl(v1, 17);
+    v1 ^= v2;
+    v2 = std::rotl(v2, 32);
+  }
+
+  void compress(uint64_t m) {
+    v3 ^= m;
+    for (int i = 0; i < C_ROUNDS; i++)
+      round();
+    v0 ^= m;
+  }
+
+  void finalize() {
+    for (int i = 0; i < D_ROUNDS; i++)
+      round();
+  }
+};
+
+using SipHash = SipHashTmpl<2, 4, 64>;
+using SipHash128 = SipHashTmpl<2, 4, 128>;
+using SipHash13 = SipHashTmpl<1, 3, 64>;
+using SipHash13_128 = SipHashTmpl<1, 3, 128>;

lib/tar.cc

@@ -1,7 +1,15 @@
-#include "mold.h"
+// This file contains functions to create a tar file.
+
+#include "lib.h"
+
+#ifdef _WIN32
+# define ftruncate _chsize_s
+#endif
 
 namespace mold {
 
+static constexpr i64 BLOCK_SIZE = 512;
+
 // A tar file consists of one or more Ustar header followed by data.
 // Each Ustar header represents a single file in an archive.
 //
@@ -11,23 +19,6 @@ namespace mold {
 //
 // For simplicity, we always emit a PAX header even for a short filename.
 struct UstarHeader {
-  UstarHeader() {
-    memset(this, 0, sizeof(*this));
-  }
-
-  void finalize() {
-    memset(checksum, ' ', sizeof(checksum));
-    memcpy(magic, "ustar", 5);
-    memcpy(version, "00", 2);
-
-    // Compute checksum
-    int sum = 0;
-    for (i64 i = 0; i < sizeof(*this); i++)
-      sum += ((u8 *)this)[i];
-    assert(sum < 1000000);
-    sprintf(checksum, "%06o", sum);
-  }
-
   char name[100];
   char mode[8];
   char uid[8];
@@ -47,6 +38,25 @@ struct UstarHeader {
   char pad[12];
 };
 
+static_assert(sizeof(UstarHeader) == BLOCK_SIZE);
+
+static void finalize(UstarHeader &hdr) {
+  memset(hdr.checksum, ' ', sizeof(hdr.checksum));
+  memcpy(hdr.magic, "ustar", 5);
+  memcpy(hdr.version, "00", 2);
+
+  // Compute checksum
+  int sum = 0;
+  for (i64 i = 0; i < sizeof(hdr); i++)
+    sum += ((u8 *)&hdr)[i];
+
+  // We need to convince the compiler that sum isn't too big to silence
+  // -Werror=format-truncation.
+  if (sum >= 01'000'000)
+    unreachable();
+  snprintf(hdr.checksum, sizeof(hdr.checksum), "%06o", sum);
+}
+
 static std::string encode_path(std::string basedir, std::string path) {
   path = path_clean(basedir + "/" + path);
 
@@ -73,13 +83,16 @@ TarWriter::~TarWriter() {
 
 void TarWriter::append(std::string path, std::string_view data) {
   // Write PAX header
-  static_assert(sizeof(UstarHeader) == BLOCK_SIZE);
-  UstarHeader pax;
+  UstarHeader pax = {};
 
   std::string attr = encode_path(basedir, path);
-  sprintf(pax.size, "%011zo", attr.size());
+
+  if (attr.size() >= 0100'000'000'000)
+    unreachable();
+  snprintf(pax.size, sizeof(pax.size), "%011zo", attr.size());
+  pax.name[0] = '/';
   pax.typeflag[0] = 'x';
-  pax.finalize();
+  finalize(pax);
   fwrite(&pax, sizeof(pax), 1, out);
 
   // Write pathname
@@ -87,23 +100,20 @@ void TarWriter::append(std::string path, std::string_view data) {
   fseek(out, align_to(ftell(out), BLOCK_SIZE), SEEK_SET);
 
   // Write Ustar header
-  UstarHeader ustar;
+  UstarHeader ustar = {};
   memcpy(ustar.mode, "0000664", 8);
-  sprintf(ustar.size, "%011zo", data.size());
-  ustar.finalize();
+  if (data.size() >= 0100'000'000'000)
+    unreachable();
+  snprintf(ustar.size, sizeof(ustar.size), "%011zo", data.size());
+  finalize(ustar);
   fwrite(&ustar, sizeof(ustar), 1, out);
 
   // Write file contents
   fwrite(data.data(), data.size(), 1, out);
   fseek(out, align_to(ftell(out), BLOCK_SIZE), SEEK_SET);
 
-  // A tar file must ends with two empty blocks, so write such
-  // terminator and seek back.
-  u8 terminator[BLOCK_SIZE * 2] = {};
-  fwrite(&terminator, BLOCK_SIZE * 2, 1, out);
-  fseek(out, -BLOCK_SIZE * 2, SEEK_END);
-
-  assert(ftell(out) % BLOCK_SIZE == 0);
+  // A tar file must ends with two empty blocks
+  (void)!ftruncate(fileno(out), ftell(out) + BLOCK_SIZE * 2);
 }
 
 } // namespace mold

lib/update-git-hash.cmake

@@ -0,0 +1,33 @@
+# Get a git hash value. We do not want to use git command here
+# because we don't want to make git a build-time dependency.
+if(EXISTS "${SOURCE_DIR}/.git/HEAD")
+  file(READ "${SOURCE_DIR}/.git/HEAD" HASH)
+  string(STRIP "${HASH}" HASH)
+
+  if(HASH MATCHES "^ref: (.*)")
+    set(HEAD "${CMAKE_MATCH_1}")
+    if(EXISTS "${SOURCE_DIR}/.git/${HEAD}")
+      file(READ "${SOURCE_DIR}/.git/${HEAD}" HASH)
+      string(STRIP "${HASH}" HASH)
+    else()
+      file(READ "${SOURCE_DIR}/.git/packed-refs" PACKED_REFS)
+      string(REGEX REPLACE ".*\n([0-9a-f]+) ${HEAD}\n.*" "\\1" HASH "\n${PACKED_REFS}")
+    endif()
+  endif()
+endif()
+
+# Create new file contents and update a given file if necessary.
+if("${HASH}" STREQUAL "")
+  set(NEW_CONTENTS "")
+else()
+  set(NEW_CONTENTS "#define MOLD_GIT_HASH \"${HASH}\"\n")
+endif()
+
+if(EXISTS "${OUTPUT_FILE}")
+  file(READ "${OUTPUT_FILE}" OLD_CONTENTS)
+  if(NOT "${NEW_CONTENTS}" STREQUAL "${OLD_CONTENTS}")
+    file(WRITE "${OUTPUT_FILE}" "${NEW_CONTENTS}")
+  endif()
+else()
+  file(WRITE "${OUTPUT_FILE}" "${NEW_CONTENTS}")
+endif()

macho/arch-arm64.cc

@@ -1,709 +0,0 @@
-#include "mold.h"
-
-#include <tbb/parallel_for.h>
-#include <tbb/parallel_for_each.h>
-
-namespace mold::macho {
-
-using E = ARM64;
-
-static u64 page(u64 val) {
-  return val & 0xffff'ffff'ffff'f000;
-}
-
-static u64 page_offset(u64 hi, u64 lo) {
-  u64 val = page(hi) - page(lo);
-  return (bits(val, 13, 12) << 29) | (bits(val, 32, 14) << 5);
-}
-
-template <>
-void StubsSection<E>::copy_buf(Context<E> &ctx) {
-  ul32 *buf = (ul32 *)(ctx.buf + this->hdr.offset);
-
-  for (i64 i = 0; i < syms.size(); i++) {
-    static const u32 insn[] = {
-      0x90000010, // adrp x16, $ptr@PAGE
-      0xf9400210, // ldr  x16, [x16, $ptr@PAGEOFF]
-      0xd61f0200, // br   x16
-    };
-
-    static_assert(sizeof(insn) == E::stub_size);
-
-    u64 la_addr = ctx.lazy_symbol_ptr.hdr.addr + E::word_size * i;
-    u64 this_addr = this->hdr.addr + E::stub_size * i;
-
-    memcpy(buf, insn, sizeof(insn));
-    buf[0] |= page_offset(la_addr, this_addr);
-    buf[1] |= bits(la_addr, 11, 3) << 10;
-    buf += 3;
-  }
-}
-
-template <>
-void StubHelperSection<E>::copy_buf(Context<E> &ctx) {
-  ul32 *start = (ul32 *)(ctx.buf + this->hdr.offset);
-  ul32 *buf = start;
-
-  static const u32 insn0[] = {
-    0x90000011, // adrp x17, $__dyld_private@PAGE
-    0x91000231, // add  x17, x17, $__dyld_private@PAGEOFF
-    0xa9bf47f0, // stp	x16, x17, [sp, #-16]!
-    0x90000010, // adrp x16, $dyld_stub_binder@PAGE
-    0xf9400210, // ldr  x16, [x16, $dyld_stub_binder@PAGEOFF]
-    0xd61f0200, // br   x16
-  };
-
-  static_assert(sizeof(insn0) == E::stub_helper_hdr_size);
-  memcpy(buf, insn0, sizeof(insn0));
-
-  u64 dyld_private = get_symbol(ctx, "__dyld_private")->get_addr(ctx);
-  buf[0] |= page_offset(dyld_private, this->hdr.addr);
-  buf[1] |= bits(dyld_private, 11, 0) << 10;
-
-  u64 stub_binder = get_symbol(ctx, "dyld_stub_binder")->get_got_addr(ctx);
-  buf[3] |= page_offset(stub_binder, this->hdr.addr - 12);
-  buf[4] |= bits(stub_binder, 11, 0) << 10;
-
-  buf += 6;
-
-  for (i64 i = 0; i < ctx.stubs.syms.size(); i++) {
-    static const u32 insn[] = {
-      0x18000050, // ldr  w16, addr
-      0x14000000, // b    stubHelperHeader
-      0x00000000, // addr: .long <idx>
-    };
-
-    static_assert(sizeof(insn) == E::stub_helper_size);
-
-    memcpy(buf, insn, sizeof(insn));
-    buf[1] |= bits((start - buf - 1) * 4, 27, 2);
-    buf[2] = ctx.stubs.bind_offsets[i];
-    buf += 3;
-  }
-}
-
-template <>
-std::vector<Relocation<E>>
-read_relocations(Context<E> &ctx, ObjectFile<E> &file, const MachSection &hdr) {
-  std::vector<Relocation<E>> vec;
-  vec.reserve(hdr.nreloc);
-
-  MachRel *rels = (MachRel *)(file.mf->data + hdr.reloff);
-
-  for (i64 i = 0; i < hdr.nreloc; i++) {
-    i64 addend = 0;
-
-    switch (rels[i].type) {
-    case ARM64_RELOC_UNSIGNED:
-    case ARM64_RELOC_SUBTRACTOR:
-      switch (rels[i].p2size) {
-      case 2:
-        addend = *(il32 *)((u8 *)file.mf->data + hdr.offset + rels[i].offset);
-        break;
-      case 3:
-        addend = *(il64 *)((u8 *)file.mf->data + hdr.offset + rels[i].offset);
-        break;
-      default:
-        unreachable();
-      }
-      break;
-    case ARM64_RELOC_ADDEND:
-      addend = rels[i++].idx;
-      break;
-    }
-
-    MachRel &r = rels[i];
-    vec.push_back({r.offset, (u8)r.type, (u8)r.p2size});
-
-    Relocation<E> &rel = vec.back();
-
-    if (i > 0 && rels[i - 1].type == ARM64_RELOC_SUBTRACTOR)
-      rel.is_subtracted = true;
-
-    if (!rel.is_subtracted && rels[i].type != ARM64_RELOC_SUBTRACTOR)
-      rel.is_pcrel = r.is_pcrel;
-
-    if (r.is_extern) {
-      rel.sym = file.syms[r.idx];
-      rel.addend = addend;
-      continue;
-    }
-
-    u64 addr = r.is_pcrel ? (hdr.addr + r.offset + addend) : addend;
-    Subsection<E> *target = file.find_subsection(ctx, r.idx - 1, addr);
-    if (!target)
-      Fatal(ctx) << file << ": bad relocation: " << r.offset;
-
-    rel.subsec = target;
-    rel.addend = addr - target->input_addr;
-  }
-
-  return vec;
-}
-
-template <>
-void Subsection<E>::scan_relocations(Context<E> &ctx) {
-  for (Relocation<E> &r : get_rels()) {
-    Symbol<E> *sym = r.sym;
-    if (!sym)
-      continue;
-
-    if (sym->is_imported && sym->file->is_dylib)
-      ((DylibFile<E> *)sym->file)->is_alive = true;
-
-    switch (r.type) {
-    case ARM64_RELOC_UNSIGNED:
-      if (sym->is_imported) {
-        if (r.p2size != 3) {
-          Error(ctx) << this->isec << ": " << r << " relocation at offset 0x"
-                     << std::hex << r.offset << " against symbol `"
-                     << *sym << "' can not be used";
-        }
-        r.needs_dynrel = true;
-      }
-      break;
-    case ARM64_RELOC_GOT_LOAD_PAGE21:
-    case ARM64_RELOC_GOT_LOAD_PAGEOFF12:
-    case ARM64_RELOC_POINTER_TO_GOT:
-      sym->flags |= NEEDS_GOT;
-      break;
-    case ARM64_RELOC_TLVP_LOAD_PAGE21:
-    case ARM64_RELOC_TLVP_LOAD_PAGEOFF12:
-      sym->flags |= NEEDS_THREAD_PTR;
-      break;
-    }
-
-    if (sym->is_imported)
-      sym->flags |= NEEDS_STUB;
-  }
-}
-
-template <>
-void Subsection<E>::apply_reloc(Context<E> &ctx, u8 *buf) {
-  std::span<Relocation<E>> rels = get_rels();
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    Relocation<E> &r = rels[i];
-    u8 *loc = buf + r.offset;
-    i64 val = r.addend;
-    u64 pc = get_addr(ctx) + r.offset;
-
-    if (r.sym && !r.sym->file) {
-      Error(ctx) << "undefined symbol: " << isec.file << ": " << *r.sym;
-      continue;
-    }
-
-    // Compute a relocated value.
-    switch (r.type) {
-    case ARM64_RELOC_UNSIGNED:
-    case ARM64_RELOC_BRANCH26:
-    case ARM64_RELOC_PAGE21:
-    case ARM64_RELOC_PAGEOFF12:
-      val += r.sym ? r.sym->get_addr(ctx) : r.subsec->get_addr(ctx);
-      break;
-    case ARM64_RELOC_SUBTRACTOR: {
-      Relocation<E> s = rels[++i];
-      assert(s.type == ARM64_RELOC_UNSIGNED);
-      u64 val1 = r.sym ? r.sym->get_addr(ctx) : r.subsec->get_addr(ctx);
-      u64 val2 = s.sym ? s.sym->get_addr(ctx) : s.subsec->get_addr(ctx);
-      val += val2 - val1;
-      break;
-    }
-    case ARM64_RELOC_GOT_LOAD_PAGE21:
-    case ARM64_RELOC_GOT_LOAD_PAGEOFF12:
-    case ARM64_RELOC_POINTER_TO_GOT:
-      val += r.sym->get_got_addr(ctx);
-      break;
-    case ARM64_RELOC_TLVP_LOAD_PAGE21:
-    case ARM64_RELOC_TLVP_LOAD_PAGEOFF12:
-      val += r.sym->get_tlv_addr(ctx);
-      break;
-    default:
-      Fatal(ctx) << isec << ": unknown reloc: " << (int)r.type;
-    }
-
-    // An address of a thread-local variable is computed as an offset
-    // to the beginning of the first thread-local section.
-    if (isec.hdr.type == S_THREAD_LOCAL_VARIABLES)
-      val -= ctx.tls_begin;
-
-    // Write a computed value to the output buffer.
-    switch (r.type) {
-    case ARM64_RELOC_UNSIGNED:
-    case ARM64_RELOC_SUBTRACTOR:
-    case ARM64_RELOC_POINTER_TO_GOT:
-      if (r.is_pcrel)
-        val -= pc;
-
-      if (r.p2size == 2)
-        *(ul32 *)loc = val;
-      else if (r.p2size == 3)
-        *(ul64 *)loc = val;
-      else
-        unreachable();
-      break;
-    case ARM64_RELOC_BRANCH26: {
-      assert(r.is_pcrel);
-      val -= pc;
-
-      i64 lo = -(1 << 27);
-      i64 hi = 1 << 27;
-
-      if (val < lo || hi <= val) {
-        val = isec.osec.thunks[r.thunk_idx]->get_addr(r.thunk_sym_idx) - pc;
-        assert(lo <= val && val < hi);
-      }
-
-      *(ul32 *)loc |= bits(val, 27, 2);
-      break;
-    }
-    case ARM64_RELOC_PAGE21:
-    case ARM64_RELOC_GOT_LOAD_PAGE21:
-    case ARM64_RELOC_TLVP_LOAD_PAGE21:
-      assert(r.is_pcrel);
-      *(ul32 *)loc |= page_offset(val, pc);
-      break;
-    case ARM64_RELOC_PAGEOFF12:
-    case ARM64_RELOC_GOT_LOAD_PAGEOFF12:
-    case ARM64_RELOC_TLVP_LOAD_PAGEOFF12: {
-      assert(!r.is_pcrel);
-      u32 insn = *(ul32 *)loc;
-      i64 scale = 0;
-      if ((insn & 0x3b000000) == 0x39000000) {
-        scale = bits(insn, 31, 30);
-        if (scale == 0 && (insn & 0x04800000) == 0x04800000)
-          scale = 4;
-      }
-      *(ul32 *)loc |= bits(val, 11, scale) << 10;
-      break;
-    }
-    default:
-      Fatal(ctx) << isec << ": unknown reloc: " << (int)r.type;
-    }
-  }
-}
-
-static void reset_thunk(RangeExtensionThunk<E> &thunk) {
-  for (Symbol<E> *sym : thunk.symbols) {
-    sym->thunk_idx = -1;
-    sym->thunk_sym_idx = -1;
-    sym->flags &= (u8)~NEEDS_RANGE_EXTN_THUNK;
-  }
-}
-
-static bool is_reachable(Context<E> &ctx, Symbol<E> &sym,
-                         Subsection<E> &subsec, Relocation<E> &rel) {
-  // We pessimistically assume that PLT entries are unreacahble.
-  if (sym.stub_idx != -1)
-    return false;
-
-  // We create thunks with a pessimistic assumption that all
-  // out-of-section relocations would be out-of-range.
-  if (!sym.subsec || &sym.subsec->isec.osec != &subsec.isec.osec)
-    return false;
-
-  if (sym.subsec->output_offset == -1)
-    return false;
-
-  // Compute a distance between the relocated place and the symbol
-  // and check if they are within reach.
-  i64 addr = sym.get_addr(ctx);
-  i64 pc = subsec.get_addr(ctx) + rel.offset;
-  i64 val = addr + rel.addend - pc;
-  return -(1 << 27) <= val && val < (1 << 27);
-}
-
-// We create a thunk no further than 100 MiB from any section.
-static constexpr i64 MAX_DISTANCE = 100 * 1024 * 1024;
-
-// We create a thunk for each 10 MiB input sections.
-static constexpr i64 GROUP_SIZE = 10 * 1024 * 1024;
-
-// ARM64's call/jump instructions take 27 bits displacement, so they
-// can refer only up to ±128 MiB. If a branch target is further than
-// that, we need to let it branch to a linker-synthesized code
-// sequence that construct a full 32 bit address in a register and
-// jump there. That linker-synthesized code is called "thunk".
-void create_range_extension_thunks(Context<E> &ctx, OutputSection<E> &osec) {
-  std::span<Subsection<E> *> members = osec.members;
-  if (members.empty())
-    return;
-
-  members[0]->output_offset = 0;
-
-  // Initialize input sections with a dummy offset so that we can
-  // distinguish sections that have got an address with the one who
-  // haven't.
-  tbb::parallel_for((i64)1, (i64)members.size(), [&](i64 i) {
-    members[i]->output_offset = -1;
-  });
-
-  // We create thunks from the beginning of the section to the end.
-  // We manage progress using four offsets which increase monotonically.
-  // The locations they point to are always A <= B <= C <= D.
-  i64 a = 0;
-  i64 b = 0;
-  i64 c = 0;
-  i64 d = 0;
-  i64 offset = 0;
-
-  while (b < members.size()) {
-    // Move D foward as far as we can jump from B to D.
-    while (d < members.size() &&
-           offset - members[b]->output_offset < MAX_DISTANCE) {
-      offset = align_to(offset, 1 << members[d]->p2align);
-      members[d]->output_offset = offset;
-      offset += members[d]->input_size;
-      d++;
-    }
-
-    // Move C forward so that C is apart from B by GROUP_SIZE.
-    while (c < members.size() &&
-           members[c]->output_offset - members[b]->output_offset < GROUP_SIZE)
-      c++;
-
-    // Move A forward so that A is reachable from C.
-    if (c > 0) {
-      i64 c_end = members[c - 1]->output_offset + members[c - 1]->input_size;
-      while (a < osec.thunks.size() &&
-             osec.thunks[a]->offset < c_end - MAX_DISTANCE)
-        reset_thunk(*osec.thunks[a++]);
-    }
-
-    // Create a thunk for input sections between B and C and place it at D.
-    osec.thunks.emplace_back(new RangeExtensionThunk<E>{osec});
-
-    RangeExtensionThunk<E> &thunk = *osec.thunks.back();
-    thunk.thunk_idx = osec.thunks.size() - 1;
-    thunk.offset = offset;
-
-    // Scan relocations between B and C to collect symbols that need thunks.
-    tbb::parallel_for_each(members.begin() + b, members.begin() + c,
-                           [&](Subsection<E> *subsec) {
-      std::span<Relocation<E>> rels = subsec->get_rels();
-
-      for (i64 i = 0; i < rels.size(); i++) {
-        Relocation<E> &r = rels[i];
-        if (!r.sym->file || r.type != ARM64_RELOC_BRANCH26)
-          continue;
-
-        // Skip if the destination is within reach.
-        if (is_reachable(ctx, *r.sym, *subsec, r))
-          continue;
-
-        // If the symbol is already in another thunk, reuse it.
-        if (r.sym->thunk_idx != -1) {
-          r.thunk_idx = r.sym->thunk_idx;
-          r.thunk_sym_idx = r.sym->thunk_sym_idx;
-          continue;
-        }
-
-        // Otherwise, add the symbol to this thunk if it's not added already.
-        r.thunk_idx = thunk.thunk_idx;
-        r.thunk_sym_idx = -1;
-
-        if (!(r.sym->flags.fetch_or(NEEDS_RANGE_EXTN_THUNK) &
-              NEEDS_RANGE_EXTN_THUNK)) {
-          std::scoped_lock lock(thunk.mu);
-          thunk.symbols.push_back(r.sym);
-        }
-      }
-    });
-
-    // Now that we know the number of symbols in the thunk, we can compute
-    // its size.
-    offset += thunk.size();
-
-    // Sort symbols added to the thunk to make the output deterministic.
-    sort(thunk.symbols, [](Symbol<E> *a, Symbol<E> *b) {
-      return std::tuple{a->file->priority, a->value} <
-             std::tuple{b->file->priority, b->value};
-    });
-
-    // Assign offsets within the thunk to the symbols.
-    for (i64 i = 0; Symbol<E> *sym : thunk.symbols) {
-      sym->thunk_idx = thunk.thunk_idx;
-      sym->thunk_sym_idx = i++;
-    }
-
-    // Scan relocations again to fix symbol offsets in the last thunk.
-    tbb::parallel_for_each(members.begin() + b, members.begin() + c,
-                           [&](Subsection<E> *subsec) {
-      for (Relocation<E> &r : subsec->get_rels())
-        if (r.thunk_idx == thunk.thunk_idx)
-          r.thunk_sym_idx = r.sym->thunk_sym_idx;
-    });
-
-    // Move B forward to point to the begining of the next group.
-    b = c;
-  }
-
-  while (a < osec.thunks.size())
-    reset_thunk(*osec.thunks[a++]);
-
-  osec.hdr.size = offset;
-}
-
-void RangeExtensionThunk<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + output_section.hdr.offset + offset;
-
-  static const u32 data[] = {
-    0x90000010, // adrp x16, 0   # R_AARCH64_ADR_PREL_PG_HI21
-    0x91000210, // add  x16, x16 # R_AARCH64_ADD_ABS_LO12_NC
-    0xd61f0200, // br   x16
-  };
-
-  static_assert(ENTRY_SIZE == sizeof(data));
-
-  for (i64 i = 0; i < symbols.size(); i++) {
-    u64 addr = symbols[i]->get_addr(ctx);
-    u64 pc = output_section.hdr.addr + offset + i * ENTRY_SIZE;
-
-    u8 *loc = buf + i * ENTRY_SIZE;
-    memcpy(loc , data, sizeof(data));
-    *(ul32 *)loc |= page_offset(addr, pc);
-    *(ul32 *)(loc + 4) |= bits(addr, 11, 0) << 10;
-  }
-}
-
-#define ASSERT_RANGE(val, start, size)                          \
-  assert((start) <= (val) && (val) < ((start) + (size)))
-
-// Rewrite
-//   ldr Xb/Wb, [Xa, #imm]
-// with
-//   ldr Xb/Wb, [#base_addr + #imm]
-// if we can.
-static bool relax_ldr(ul32 *loc, u64 loc_addr, u64 base_addr) {
-  switch (*loc & 0xffc0'0000) {
-  case 0xf940'0000: { // ldr Xb, [Xa, #imm]
-    u64 imm = bits(*loc, 21, 10) * 8;
-    i64 disp = base_addr + imm - loc_addr;
-    if (disp == sign_extend(disp, 20) && (disp & 0b11) == 0) {
-      // ldr Xc, [#base_addr + #imm]
-      *loc = 0x5800'0000 | (bits(disp, 20, 2) << 5) | bits(*loc, 4, 0);
-      return true;
-    }
-    return false;
-  }
-  case 0xb940'0000: { // ldr Wb, [Xa, #imm]
-    u64 imm = bits(*loc, 21, 10) * 4;
-    i64 disp = base_addr + imm - loc_addr;
-    if (disp == sign_extend(disp, 20) && (disp & 0b11) == 0) {
-      // ldr Wc, [#base_addr + #imm]
-      *loc = 0x1800'0000 | (bits(disp, 20, 2) << 5) | bits(*loc, 4, 0);
-      return true;
-    }
-    return false;
-  }
-  }
-  return false;
-}
-
-static bool is_adrp(ul32 *loc) {
-  return (*loc & 0x9f00'0000) == 0x9000'0000;
-}
-
-static u64 get_adrp_imm(ul32 *loc) {
-  return (bits(*loc, 23, 5) << 14) + (bits(*loc, 30, 29) << 12);
-}
-
-template <typename E>
-static void relax_adrp_ldr_got_ldr(Context<E> &ctx,
-                                   ul32 *loc1, ul32 *loc2, ul32 *loc3,
-                                   u64 addr1, u64 addr2, u64 addr3,
-                                   ObjectFile<E> *file) {
-  // We expect the following instructions for a GOT-indirect load:
-  //
-  //   adrp Xa, _foo@GOTPAGE
-  //   ldr  Xb, [Xa, _foo@GOTPAGEOFF]
-  //   ldr/ldrb/ldrsb/ldrsh/... Xc/Wc, [Xb, #imm]
-  if (!is_adrp(loc1) || (*loc2 & 0xffc0'0000) != 0xf940'0000)
-    return;
-
-  u64 got_page = page(addr1) + get_adrp_imm(loc1);
-  u64 pageoff = bits(*loc2, 21, 10) << 3;
-
-  if (got_page + pageoff < ctx.got.hdr.addr ||
-      ctx.got.hdr.addr + ctx.got.hdr.size <= got_page + pageoff)
-    Fatal(ctx) << *file << ": LDR_GOT_LDR out of range";
-
-  ASSERT_RANGE(got_page + pageoff, ctx.got.hdr.addr, ctx.got.hdr.size);
-
-  u64 got_value = *(ul64 *)(ctx.buf + ctx.got.hdr.offset + got_page + pageoff -
-                            ctx.got.hdr.addr);
-
-  // If the GOT slot is already filled with a value and we can
-  // inline the value, do it.
-  if (got_value && relax_ldr(loc3, addr3, got_value)) {
-    *loc1 = 0xd503'201f; // nop
-    *loc2 = 0xd503'201f; // nop
-    return;
-  }
-
-  // If the GOT slot is close enough to PC, we can eliminate ADRP.
-  if (relax_ldr(loc2, addr2, got_page))
-    *loc1 = 0xd503'201f; // nop
-}
-
-static void relax_adrp_adrp(Context<E> &ctx, ul32 *loc1, ul32 *loc2,
-                            u64 addr1, u64 addr2) {
-  //   adrp Xa, _foo@PAGE
-  //   adrp Xa, _bar@PAGE
-  // ->
-  //   ldr  Xa, _foo@PAGE
-  //   nop
-
-  if (is_adrp(loc1) && is_adrp(loc2) &&
-      page(addr1) + get_adrp_imm(loc1) == page(addr2) + get_adrp_imm(loc2) &&
-      bits(*loc1, 4, 0) == bits(*loc2, 4, 0))
-    *loc2 = 0xd503'201f; // nop
-}
-
-static void relax_adrp_ldr(Context<E> &ctx, ul32 *loc1, ul32 *loc2,
-                           u64 addr1, u64 addr2) {
-  //   adrp Xa, _foo@PAGE
-  //   ldr  Xb/Wb, [Xa, _foo@PAGEOFF]
-  // ->
-  //   nop
-  //   ldr  Xb/Wb, [_foo]
-  if (is_adrp(loc1) && relax_ldr(loc2, addr2, page(addr1) + get_adrp_imm(loc1)))
-    *loc1 = 0xd503'201f; // nop
-}
-
-static void relax_adrp_add(Context<E> &ctx, ul32 *loc1, ul32 *loc2,
-                           u64 addr1, u64 addr2) {
-  //   adrp Xa, _foo@PAGE
-  //   add  Xb, Xa, _foo@PAGEOFF
-  // ->
-  //   nop
-  //   adr  Xb, _foo
-  if (!is_adrp(loc1) || (*loc2 & 0xffc0'0000) != 0x9100'0000)
-    return;
-
-  i64 disp = page(addr1) + get_adrp_imm(loc1) + bits(*loc2, 21, 10) - addr2;
-
-  if (disp == sign_extend(disp, 20)) {
-    *loc1 = 0xd503'201f;                                  // nop
-    *loc2 = 0x1000'0000 | (bits(disp, 1, 0) << 29) |
-            (bits(disp, 20, 2) << 5) | bits(*loc2, 4, 0); // adr Xb, _foo
-  }
-}
-
-static Subsection<E> *find_subsection_by_addr(ObjectFile<E> *file, u32 addr) {
-  for (Subsection<E> *subsec : file->subsections)
-    if (subsec->input_addr <= addr &&
-        addr < subsec->input_addr + subsec->input_size)
-      return subsec;
-  return nullptr;
-}
-
-// On ARM, we generally need two or more instructions to materialize
-// an address of an object in a register or jump to a function.
-// However, if an object or a function is close enough to PC, a single
-// instruction suffices.
-//
-// This function replaces such redundant instruction sequences with
-// shorter instruction sequences. We pad holes with NOPs, so the total
-// number of instructions won't change by this relaxation, but replacing
-// instructions with NOPs generally makes program faster since the CPU
-// has a special logic to skip NOPs as quickly as possible.
-//
-// Locations of relaxable instructions are in the
-// LC_LINKER_OPTIMIZATION_HINT segment. That segment contains a
-// sequence of ULEB-encoded integers.
-//
-// This pass is optional; an output file works correctly without
-// applying these optimizations.
-void apply_linker_optimization_hints(Context<E> &ctx) {
-  Timer t(ctx, "apply_linker_optimization_hints");
-
-  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
-    std::string_view hints = file->get_linker_optimization_hints(ctx);
-
-    while (!hints.empty()) {
-      i64 type = read_uleb(hints);
-      if (type == 0)
-        return;
-
-      i64 nargs = read_uleb(hints);
-
-      switch (type) {
-      case LOH_ARM64_ADRP_LDR_GOT_LDR: {
-        assert(nargs == 3);
-        i64 input_addr1 = read_uleb(hints);
-        i64 input_addr2 = read_uleb(hints);
-        i64 input_addr3 = read_uleb(hints);
-
-        Subsection<E> *subsec = find_subsection_by_addr(file, input_addr1);
-        if (!subsec || !subsec->is_alive)
-          return;
-
-        ASSERT_RANGE(input_addr1, subsec->input_addr, subsec->input_size);
-        ASSERT_RANGE(input_addr2, subsec->input_addr, subsec->input_size);
-        ASSERT_RANGE(input_addr3, subsec->input_addr, subsec->input_size);
-
-        i64 offset1 = subsec->input_addr - input_addr1;
-        i64 offset2 = subsec->input_addr - input_addr2;
-        i64 offset3 = subsec->input_addr - input_addr3;
-
-        u8 *loc = ctx.buf + subsec->isec.osec.hdr.offset + subsec->output_offset;
-        ul32 *loc1 = (ul32 *)(loc + offset1);
-        ul32 *loc2 = (ul32 *)(loc + offset2);
-        ul32 *loc3 = (ul32 *)(loc + offset3);
-
-        u64 addr1 = subsec->get_addr(ctx) + offset1;
-        u64 addr2 = subsec->get_addr(ctx) + offset2;
-        u64 addr3 = subsec->get_addr(ctx) + offset3;
-
-        relax_adrp_ldr_got_ldr(ctx, loc1, loc2, loc3, addr1, addr2, addr3,
-                               file);
-        break;
-      }
-      case LOH_ARM64_ADRP_ADRP:
-      case LOH_ARM64_ADRP_LDR:
-      case LOH_ARM64_ADRP_ADD: {
-        assert(nargs == 2);
-        i64 input_addr1 = read_uleb(hints);
-        i64 input_addr2 = read_uleb(hints);
-
-        Subsection<E> *subsec = find_subsection_by_addr(file, input_addr1);
-        if (!subsec || !subsec->is_alive)
-          return;
-
-        ASSERT_RANGE(input_addr1, subsec->input_addr, subsec->input_size);
-        ASSERT_RANGE(input_addr2, subsec->input_addr, subsec->input_size);
-
-        i64 offset1 = subsec->input_addr - input_addr1;
-        i64 offset2 = subsec->input_addr - input_addr2;
-
-        u8 *loc = ctx.buf + subsec->isec.osec.hdr.offset + subsec->output_offset;
-        ul32 *loc1 = (ul32 *)(loc + offset1);
-        ul32 *loc2 = (ul32 *)(loc + offset2);
-
-        u64 addr1 = subsec->get_addr(ctx) + offset1;
-        u64 addr2 = subsec->get_addr(ctx) + offset2;
-
-        switch (type) {
-        case LOH_ARM64_ADRP_ADRP:
-          relax_adrp_adrp(ctx, loc1, loc2, addr1, addr2);
-          break;
-        case LOH_ARM64_ADRP_LDR:
-          relax_adrp_ldr(ctx, loc1, loc2, addr1, addr2);
-          break;
-        case LOH_ARM64_ADRP_ADD:
-          relax_adrp_add(ctx, loc1, loc2, addr1, addr2);
-          break;
-        }
-        break;
-      }
-      default:
-        // Skip unsupported optimizations hints.
-        for (i64 i = 0; i < nargs; i++)
-          read_uleb(hints);
-      }
-    }
-  });
-}
-
-} // namespace mold::macho

macho/arch-x86-64.cc

@@ -1,217 +0,0 @@
-#include "mold.h"
-
-namespace mold::macho {
-
-using E = X86_64;
-
-template <>
-void StubsSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *buf = ctx.buf + this->hdr.offset;
-
-  for (i64 i = 0; i < syms.size(); i++) {
-    // `ff 25 xx xx xx xx` is a RIP-relative indirect jump instruction,
-    // i.e., `jmp *IMM(%rip)`. It loads an address from la_symbol_ptr
-    // and jump there.
-    static_assert(E::stub_size == 6);
-    buf[i * 6] = 0xff;
-    buf[i * 6 + 1] = 0x25;
-    *(ul32 *)(buf + i * 6 + 2) =
-      ctx.lazy_symbol_ptr.hdr.addr + i * E::word_size -
-      (this->hdr.addr + i * 6 + 6);
-  }
-}
-
-template <>
-void StubHelperSection<E>::copy_buf(Context<E> &ctx) {
-  u8 *start = ctx.buf + this->hdr.offset;
-  u8 *buf = start;
-
-  static const u8 insn0[] = {
-    0x4c, 0x8d, 0x1d, 0, 0, 0, 0, // lea $__dyld_private(%rip), %r11
-    0x41, 0x53,                   // push %r11
-    0xff, 0x25, 0, 0, 0, 0,       // jmp *$dyld_stub_binder@GOT(%rip)
-    0x90,                         // nop
-  };
-
-  static_assert(sizeof(insn0) == E::stub_helper_hdr_size);
-
-  memcpy(buf, insn0, sizeof(insn0));
-  *(ul32 *)(buf + 3) =
-    get_symbol(ctx, "__dyld_private")->get_addr(ctx) - this->hdr.addr - 7;
-  *(ul32 *)(buf + 11) =
-    get_symbol(ctx, "dyld_stub_binder")->get_got_addr(ctx) - this->hdr.addr - 15;
-
-  buf += 16;
-
-  for (i64 i = 0; i < ctx.stubs.syms.size(); i++) {
-    u8 insn[] = {
-      0x68, 0, 0, 0, 0, // push $bind_offset
-      0xe9, 0, 0, 0, 0, // jmp $__stub_helper
-    };
-
-    static_assert(sizeof(insn) == E::stub_helper_size);
-
-    memcpy(buf, insn, sizeof(insn));
-    *(ul32 *)(buf + 1) = ctx.stubs.bind_offsets[i];
-    *(ul32 *)(buf + 6) = start - buf - 10;
-    buf += 10;
-  }
-}
-
-static i64 get_reloc_addend(u32 type) {
-  switch (type) {
-  case X86_64_RELOC_SIGNED_1:
-    return 1;
-  case X86_64_RELOC_SIGNED_2:
-    return 2;
-  case X86_64_RELOC_SIGNED_4:
-    return 4;
-  default:
-    return 0;
-  }
-}
-
-static i64 read_addend(u8 *buf, const MachRel &r) {
-  if (r.p2size == 2)
-    return *(il32 *)(buf + r.offset) + get_reloc_addend(r.type);
-  if (r.p2size == 3)
-    return *(il64 *)(buf + r.offset) + get_reloc_addend(r.type);
-  unreachable();
-}
-
-template <>
-std::vector<Relocation<E>>
-read_relocations(Context<E> &ctx, ObjectFile<E> &file,
-                 const MachSection &hdr) {
-  std::vector<Relocation<E>> vec;
-  vec.reserve(hdr.nreloc);
-
-  MachRel *rels = (MachRel *)(file.mf->data + hdr.reloff);
-
-  for (i64 i = 0; i < hdr.nreloc; i++) {
-    MachRel &r = rels[i];
-    i64 addend = read_addend((u8 *)file.mf->data + hdr.offset, r);
-
-    vec.push_back({r.offset, (u8)r.type, (u8)r.p2size});
-    Relocation<E> &rel = vec.back();
-
-    if (i > 0 && rels[i - 1].type == X86_64_RELOC_SUBTRACTOR)
-      rel.is_subtracted = true;
-
-    if (!rel.is_subtracted && rels[i].type != X86_64_RELOC_SUBTRACTOR)
-      rel.is_pcrel = r.is_pcrel;
-
-    if (r.is_extern) {
-      rel.sym = file.syms[r.idx];
-      rel.addend = addend;
-      continue;
-    }
-
-    u64 addr = r.is_pcrel ? (hdr.addr + r.offset + addend + 4) : addend;
-    Subsection<E> *target = file.find_subsection(ctx, r.idx - 1, addr);
-    if (!target)
-      Fatal(ctx) << file << ": bad relocation: " << r.offset;
-
-    rel.subsec = target;
-    rel.addend = addr - target->input_addr;
-  }
-
-  return vec;
-}
-
-template <>
-void Subsection<E>::scan_relocations(Context<E> &ctx) {
-  for (Relocation<E> &r : get_rels()) {
-    Symbol<E> *sym = r.sym;
-    if (!sym)
-      continue;
-
-    if (sym->is_imported && sym->file->is_dylib)
-      ((DylibFile<E> *)sym->file)->is_alive = true;
-
-    switch (r.type) {
-    case X86_64_RELOC_UNSIGNED:
-    case X86_64_RELOC_SUBTRACTOR:
-      if (sym->is_imported) {
-        if (r.p2size != 3) {
-          Error(ctx) << this->isec << ": " << r << " relocation at offset 0x"
-                     << std::hex << r.offset << " against symbol `"
-                     << *sym << "' can not be used";
-        }
-        r.needs_dynrel = true;
-      }
-      break;
-    case X86_64_RELOC_GOT:
-    case X86_64_RELOC_GOT_LOAD:
-      sym->flags |= NEEDS_GOT;
-      break;
-    case X86_64_RELOC_TLV:
-      sym->flags |= NEEDS_THREAD_PTR;
-      break;
-    }
-
-    if (sym->is_imported)
-      sym->flags |= NEEDS_STUB;
-  }
-}
-
-template <>
-void Subsection<E>::apply_reloc(Context<E> &ctx, u8 *buf) {
-  std::span<Relocation<E>> rels = get_rels();
-
-  for (i64 i = 0; i < rels.size(); i++) {
-    Relocation<E> &r = rels[i];
-    u64 val = r.addend;
-
-    if (r.sym && !r.sym->file) {
-      Error(ctx) << "undefined symbol: " << isec.file << ": " << *r.sym;
-      continue;
-    }
-
-    switch (r.type) {
-    case X86_64_RELOC_UNSIGNED:
-    case X86_64_RELOC_SIGNED:
-    case X86_64_RELOC_BRANCH:
-    case X86_64_RELOC_SIGNED_1:
-    case X86_64_RELOC_SIGNED_2:
-    case X86_64_RELOC_SIGNED_4:
-      val += r.sym ? r.sym->get_addr(ctx) : r.subsec->get_addr(ctx);
-      break;
-    case X86_64_RELOC_SUBTRACTOR: {
-      Relocation<E> s = rels[++i];
-      assert(s.type == X86_64_RELOC_UNSIGNED);
-      assert(r.p2size == s.p2size);
-      u64 val1 = r.sym ? r.sym->get_addr(ctx) : r.subsec->get_addr(ctx);
-      u64 val2 = s.sym ? s.sym->get_addr(ctx) : s.subsec->get_addr(ctx);
-      val += val2 - val1;
-      break;
-    }
-    case X86_64_RELOC_GOT:
-    case X86_64_RELOC_GOT_LOAD:
-      val += r.sym->get_got_addr(ctx);
-      break;
-    case X86_64_RELOC_TLV:
-      val += r.sym->get_tlv_addr(ctx);
-      break;
-    default:
-      Fatal(ctx) << isec << ": unknown reloc: " << (int)r.type;
-    }
-
-    if (isec.hdr.type == S_THREAD_LOCAL_VARIABLES) {
-      // An address of a thread-local variable is computed as an offset
-      // to the beginning of the first thread-local section.
-      val -= ctx.tls_begin;
-    } else if (r.is_pcrel) {
-      val -= get_addr(ctx) + r.offset + 4 + get_reloc_addend(r.type);
-    }
-
-    if (r.p2size == 2)
-      *(ul32 *)(buf + r.offset) = val;
-    else if (r.p2size == 3)
-      *(ul64 *)(buf + r.offset) = val;
-    else
-      unreachable();
-  }
-}
-
-} // namespace mold::macho

macho/cmdline.cc

@@ -1,569 +0,0 @@
-#include "mold.h"
-#include "../cmdline.h"
-
-#include <optional>
-#include <regex>
-#include <sstream>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unordered_set>
-
-#ifndef _WIN32
-#include <unistd.h>
-#endif
-
-namespace mold::macho {
-
-static const char helpmsg[] = R"(
-Options:
-  -F<PATH>                    Add DIR to framework search path
-  -L<PATH>                    Add DIR to library search path
-  -ObjC                       Load all static archive members that implement
-                              an Objective-C class or category
-  -U <SYMBOL>                 Allow a symbol to be undefined
-  -Z                          Do not search the standard directories when
-                              searching for libraries and frameworks
-  -add_ast_path <FILE>        Add a N_AST symbol with the given filename
-  -add_empty_section <SEGNAME> <SECTNAME>
-                              Add an empty section
-  -adhoc_codesign             Add ad-hoc code signature to the output file
-    -no_adhoc_codesign
-  -all_load                   Include all objects from static archives
-    -noall_load
-  -application_extension      Verify that all dylibs are extension-safe
-    -no_application_extension
-  -arch <ARCH_NAME>           Specify target architecture
-  -bundle                     Produce a mach-o bundle
-  -bundle_loader <EXECUTABLE> Resolve undefined symbols using the given executable
-  -compatibility_version <VERSION>
-                              Specifies the compatibility version number of the library
-  -current_version <VERSION>  Specifies the current version number of the library.
-  -dead_strip                 Remove unreachable functions and data
-  -dead_strip_dylibs          Remove unreachable dylibs from dependencies
-  -debug_variant              Ignored
-  -demangle                   Demangle C++ symbols in log messages (default)
-  -dependency_info <FILE>     Ignored
-  -dylib                      Produce a dynamic library
-  -dylib_compatibility_version <VERSION>
-                              Alias for -compatibility_version
-  -dylib_current_version <VERSION>
-                              Alias for -current_version
-  -dylib_install_name         Alias for -install_name
-  -dynamic                    Link against dylibs (default)
-  -e <SYMBOL>                 Specify the entry point of a main executable
-  -execute                    Produce an executable (default)
-  -export_dynamic             Preserves all global symbols in main executables during LTO
-  -exported_symbol <SYMBOL>   Export a given symbol
-  -exported_symbols_list <FILE>
-                              Read a list of exported symbols from a given file
-  -filelist <FILE>[,<DIR>]    Specify the list of input file names
-  -final_output <NAME>
-  -force_load <FILE>          Include all objects from a given static archive
-  -framework <NAME>,[,<SUFFIX>]
-                              Search for a given framework
-  -headerpad <SIZE>           Allocate the size of padding after load commands
-  -headerpad_max_install_names
-                              Allocate MAXPATHLEN byte padding after load commands
-  -help                       Report usage information
-  -hidden-l<LIB>
-  -ignore_optimization_hints  Do not rewrite instructions as optimization (default)
-    -enable_optimization_hints
-  -install_name <NAME>
-  -l<LIB>                     Search for a given library
-  -lto_library <FILE>         Ignored
-  -macos_version_min <VERSION>
-  -map <FILE>                 Write map file to a given file
-  -mark_dead_strippable_dylib Mark the output as dead-strippable
-  -needed-l<LIB>              Search for a given library
-  -needed-framework <NAME>[,<SUFFIX>]
-                              Search for a given framework
-  -no_deduplicate             Ignored
-  -no_function_starts         Do not generate an LC_FUNCTION_STARTS load command
-  -no_uuid                    Do not generate an LC_UUID load command
-  -o <FILE>                   Set output filename
-  -objc_abi_version <VERSION> Ignored
-  -object_path_lto <FILE>     Write a LTO temporary file to a given path
-  -order_file <FILE>          Ignored
-  -pagezero_size <SIZE>       Specify the size of the __PAGEZERO segment
-  -platform_version <PLATFORM> <MIN_VERSION> <SDK_VERSION>
-                              Set platform, platform version and SDK version
-  -random_uuid                Generate a random LC_UUID load command
-  -reexport-l<LIB>            Search for a given library
-  -rpath <PATH>               Add PATH to the runpath search path list
-  -search_dylibs_first
-  -search_paths_first
-  -sectalign <SEGNAME> <SECTNAME> <VALUE>
-                              Set a section's alignment to a given value
-  -sectcreate <SEGNAME> <SECTNAME> <FILE>
-  -stack_size <SIZE>
-  -stats                      Show statistics info
-  -syslibroot <DIR>           Prepend DIR to library search paths
-  -t                          Print out each file the linker loads
-  -thread_count <NUMBER>      Use given number of threads
-  -u <SYMBOL>                 Force load a given symbol from archive if necessary
-  -unexported_symbol <SYMBOL> Export all but a given symbol
-  -unexported_symbols_list <FILE>
-                              Read a list of unexported symbols from a given file
-  -v                          Report version information
-  -weak_framework <NAME>[,<SUFFIX>]
-                              Search for a given framework
-  -weak-l<LIB>                Search for a given library)";
-
-template <typename E>
-static i64 parse_platform(Context<E> &ctx, std::string_view arg) {
-  static std::regex re(R"(\d+)", std::regex_constants::ECMAScript);
-  if (std::regex_match(arg.begin(), arg.end(), re))
-    return stoi(std::string(arg));
-
-  if (arg == "macos")
-    return PLATFORM_MACOS;
-  if (arg == "ios")
-    return PLATFORM_IOS;
-  if (arg == "tvos")
-    return PLATFORM_TVOS;
-  if (arg == "watchos")
-    return PLATFORM_WATCHOS;
-  if (arg == "bridgeos")
-    return PLATFORM_BRIDGEOS;
-  if (arg == "mac-catalyst")
-    return PLATFORM_MACCATALYST;
-  if (arg == "ios-simulator")
-    return PLATFORM_IOSSIMULATOR;
-  if (arg == "tvos-simulator")
-    return PLATFORM_TVOSSIMULATOR;
-  if (arg == "watchos-simulator")
-    return PLATFORM_WATCHOSSIMULATOR;
-  if (arg == "driverkit")
-    return PLATFORM_DRIVERKIT;
-  Fatal(ctx) << "unknown -platform_version name: " << arg;
-}
-
-template <typename E>
-i64 parse_version(Context<E> &ctx, std::string_view arg) {
-  static std::regex re(R"((\d+)(?:\.(\d+))?(?:\.(\d+))?)",
-                       std::regex_constants::ECMAScript);
-  std::cmatch m;
-  if (!std::regex_match(arg.data(), arg.data() + arg.size(), m, re))
-    Fatal(ctx) << "malformed version number: " << arg;
-
-  i64 major = (m[1].length() == 0) ? 0 : stoi(m[1]);
-  i64 minor = (m[2].length() == 0) ? 0 : stoi(m[2]);
-  i64 patch = (m[3].length() == 0) ? 0 : stoi(m[3]);
-  return (major << 16) | (minor << 8) | patch;
-}
-
-template <typename E>
-i64 parse_hex(Context<E> &ctx, std::string_view arg) {
-  auto flags = std::regex_constants::ECMAScript | std::regex_constants::icase;
-  static std::regex re(R"((?:0x)?[0-9a-f]+)", flags);
-
-  std::cmatch m;
-  if (!std::regex_match(arg.begin(), arg.end(), re))
-    Fatal(ctx) << "malformed hexadecimal number: " << arg;
-
-  if (arg.starts_with("0x") || arg.starts_with("0X"))
-    return std::stoll(std::string(arg.substr(2)), nullptr, 16);
-  return std::stoll(std::string(arg), nullptr, 16);
-}
-
-static bool is_directory(std::filesystem::path path) {
-  std::error_code ec;
-  return std::filesystem::is_directory(path, ec) && !ec;
-}
-
-template <typename E>
-static std::vector<std::string>
-read_lines(Context<E> &ctx, std::string_view path) {
-  MappedFile<Context<E>> *mf =
-    MappedFile<Context<E>>::must_open(ctx, std::string(path));
-  std::string_view data((char *)mf->data, mf->size);
-
-  std::vector<std::string> vec;
-
-  while (!data.empty()) {
-    size_t pos = data.find('\n');
-    std::string_view line;
-
-    if (pos == data.npos) {
-      line = data;
-      data = "";
-    } else {
-      line = data.substr(0, pos);
-      data = data.substr(pos + 1);
-    }
-
-    line = string_trim(line);
-    if (!line.empty() && !line.starts_with('#'))
-      vec.push_back(std::string(line));
-  }
-  return vec;
-}
-
-template <typename E>
-std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
-  std::vector<std::string_view> &args = ctx.cmdline_args;
-  std::vector<std::string> remaining;
-  i64 i = 1;
-
-  std::vector<std::string> framework_paths;
-  std::vector<std::string> library_paths;
-  bool nostdlib = false;
-  std::optional<i64> pagezero_size;
-
-  while (i < args.size()) {
-    std::string_view arg;
-    std::string_view arg2;
-    std::string_view arg3;
-    u64 hex_arg;
-
-    auto read_arg = [&](std::string name) {
-      if (args[i] == name) {
-        if (args.size() <= i + 1)
-          Fatal(ctx) << "option -" << name << ": argument missing";
-        arg = args[i + 1];
-        i += 2;
-        return true;
-      }
-      return false;
-    };
-
-    auto read_arg2 = [&](std::string name) {
-      if (args[i] == name) {
-        if (args.size() <= i + 2)
-          Fatal(ctx) << "option -" << name << ": argument missing";
-        arg = args[i + 1];
-        arg2 = args[i + 2];
-        i += 3;
-        return true;
-      }
-      return false;
-    };
-
-    auto read_arg3 = [&](std::string name) {
-      if (args[i] == name) {
-        if (args.size() <= i + 3)
-          Fatal(ctx) << "option -" << name << ": argument missing";
-        arg = args[i + 1];
-        arg2 = args[i + 2];
-        arg3 = args[i + 3];
-        i += 4;
-        return true;
-      }
-      return false;
-    };
-
-    auto read_joined = [&](std::string name) {
-      if (read_arg(name))
-        return true;
-      if (args[i].starts_with(name)) {
-        arg = args[i].substr(name.size());
-        i++;
-        return true;
-      }
-      return false;
-    };
-
-    auto read_flag = [&](std::string name) {
-      if (args[i] == name) {
-        i++;
-        return true;
-      }
-      return false;
-    };
-
-    auto read_hex = [&](std::string name) {
-      if (!read_arg(name))
-        return false;
-
-      size_t pos;
-      hex_arg = std::stol(std::string(arg), &pos, 16);
-      if (pos != arg.size())
-        Fatal(ctx) << "malformed " << name << ": " << arg;
-      return true;
-    };
-
-    if (args[i].starts_with('@')) {
-      std::vector<std::string_view> vec =
-        read_response_file(ctx, args[i].substr(1));
-      args.erase(args.begin() + i);
-      args.insert(args.begin() + i, vec.begin(), vec.end());
-      continue;
-    }
-
-    if (read_flag("-help") || read_flag("--help")) {
-      SyncOut(ctx) << "Usage: " << ctx.cmdline_args[0]
-                   << " [options] file...\n" << helpmsg;
-      exit(0);
-    }
-
-    if (read_joined("-F")) {
-      framework_paths.push_back(std::string(arg));
-    } else if (read_joined("-L")) {
-      library_paths.push_back(std::string(arg));
-    } else if (read_flag("-Z")) {
-      nostdlib = true;
-    } else if (read_flag("-ObjC")) {
-      ctx.arg.ObjC = true;
-    } else if (read_arg("-U")) {
-      ctx.arg.U.push_back(std::string(arg));
-    } else if (read_arg("-add_ast_path")) {
-      ctx.arg.add_ast_path.push_back(std::string(arg));
-    } else if (read_arg2("-add_empty_section")) {
-      ctx.arg.add_empty_section.push_back({arg, arg2});
-    } else if (read_flag("-adhoc_codesign")) {
-      ctx.arg.adhoc_codesign = true;
-    } else if (read_flag("-no_adhoc_codesign")) {
-      ctx.arg.adhoc_codesign = false;
-    } else if (read_flag("-all_load")) {
-      remaining.push_back("-all_load");
-    } else if (read_flag("-noall_load")) {
-      remaining.push_back("-noall_load");
-    } else if (read_flag("-application_extension")) {
-      ctx.arg.application_extension = true;
-    } else if (read_flag("-no_application_extension")) {
-      ctx.arg.application_extension = false;
-    } else if (read_arg("-arch")) {
-      if (arg == "x86_64")
-        ctx.arg.arch = CPU_TYPE_X86_64;
-      else if (arg == "arm64")
-        ctx.arg.arch = CPU_TYPE_ARM64;
-      else
-        Fatal(ctx) << "unknown -arch: " << arg;
-    } else if (read_flag("-bundle")) {
-      ctx.output_type = MH_BUNDLE;
-    } else if (read_arg("-bundle_loader")) {
-      ctx.arg.bundle_loader = arg;
-    } else if (read_arg("-compatibility_version") ||
-               read_arg("-dylib_compatibility_version")) {
-      ctx.arg.compatibility_version = parse_version(ctx, arg);
-    } else if (read_arg("-current_version") ||
-               read_arg("-dylib_current_version")) {
-      ctx.arg.current_version = parse_version(ctx, arg);
-    } else if (read_flag("-color-diagnostics") ||
-               read_flag("--color-diagnostics")) {
-      ctx.arg.color_diagnostics = true;
-    } else if (read_flag("-dead_strip")) {
-      ctx.arg.dead_strip = true;
-    } else if (read_flag("-dead_strip_dylibs")) {
-      ctx.arg.dead_strip_dylibs = true;
-    } else if (read_flag("-debug_variant")) {
-    } else if (read_flag("-demangle")) {
-      ctx.arg.demangle = true;
-    } else if (read_arg("-dependency_info")) {
-      ctx.arg.dependency_info = arg;
-    } else if (read_flag("-dylib")) {
-      ctx.output_type = MH_DYLIB;
-    } else if (read_hex("-headerpad")) {
-      ctx.arg.headerpad = hex_arg;
-    } else if (read_flag("-headerpad_max_install_names")) {
-      ctx.arg.headerpad = 1024;
-    } else if (read_flag("-dynamic")) {
-      ctx.arg.dynamic = true;
-    } else if (read_arg("-e")) {
-      ctx.arg.entry = get_symbol(ctx, arg);
-    } else if (read_flag("-execute")) {
-      ctx.output_type = MH_EXECUTE;
-    } else if (read_flag("-export_dynamic")) {
-      ctx.arg.export_dynamic = true;
-    } else if (read_arg("-exported_symbol")) {
-      if (!ctx.arg.exported_symbols_list.add(arg, 1))
-        Fatal(ctx) << "-exported_symbol: invalid glob pattern: " << arg;
-    } else if (read_arg("-exported_symbols_list")) {
-      for (std::string_view pat : read_lines(ctx, arg))
-        if (!ctx.arg.exported_symbols_list.add(pat, 1))
-          Fatal(ctx) << "-exported_symbols_list: " << arg
-                     << ": invalid glob pattern: " << pat;
-    } else if (read_arg("-fatal_warnings")) {
-    } else if (read_arg("-filelist")) {
-      remaining.push_back("-filelist");
-      remaining.push_back(std::string(arg));
-    } else if (read_arg("-final_output")) {
-      ctx.arg.final_output = arg;
-    } else if (read_arg("-force_load")) {
-      remaining.push_back("-force_load");
-      remaining.push_back(std::string(arg));
-    } else if (read_arg("-framework")) {
-      remaining.push_back("-framework");
-      remaining.push_back(std::string(arg));
-    } else if (read_arg("-lto_library")) {
-      ctx.arg.lto_library = arg;
-    } else if (read_arg("-macos_version_min")) {
-      ctx.arg.platform = PLATFORM_MACOS;
-      ctx.arg.platform_min_version = parse_version(ctx, arg);
-    } else if (read_joined("-hidden-l")) {
-      remaining.push_back("-hidden-l");
-      remaining.push_back(std::string(arg));
-    } else if (read_flag("-ignore_optimization_hints")) {
-      ctx.arg.ignore_optimization_hints = true;
-    } else if (read_flag("-enable_optimization_hints")) {
-      ctx.arg.ignore_optimization_hints = false;
-    } else if (read_arg("-install_name") || read_arg("-dylib_install_name")) {
-      ctx.arg.install_name = arg;
-    } else if (read_joined("-l")) {
-      remaining.push_back("-l");
-      remaining.push_back(std::string(arg));
-    } else if (read_arg("-map")) {
-      ctx.arg.map = arg;
-    } else if (read_flag("-mark_dead_strippable_dylib")) {
-      ctx.arg.mark_dead_strippable_dylib = true;
-    } else if (read_arg("-mllvm")) {
-      ctx.arg.mllvm.push_back(std::string(arg));
-    } else if (read_joined("-needed-l")) {
-      remaining.push_back("-needed-l");
-      remaining.push_back(std::string(arg));
-    } else if (read_arg("-needed_framework")) {
-      remaining.push_back("-needed_framework");
-      remaining.push_back(std::string(arg));
-    } else if (read_flag("-no_deduplicate")) {
-    } else if (read_flag("-no_function_starts")) {
-      ctx.arg.function_starts = false;
-    } else if (read_flag("-no_uuid")) {
-      ctx.arg.uuid = UUID_NONE;
-    } else if (read_arg("-o")) {
-      ctx.arg.output = arg;
-    } else if (read_arg("-objc_abi_version")) {
-    } else if (read_arg("-object_path_lto")) {
-      ctx.arg.object_path_lto = arg;
-    } else if (read_arg("-order_file")) {
-      ctx.arg.order_file = read_lines(ctx, arg);
-    } else if (read_hex("-pagezero_size")) {
-      pagezero_size = hex_arg;
-    } else if (read_flag("-perf")) {
-      ctx.arg.perf = true;
-    } else if (read_arg3("-platform_version")) {
-      ctx.arg.platform = parse_platform(ctx, arg);
-      ctx.arg.platform_min_version = parse_version(ctx, arg2);
-      ctx.arg.platform_sdk_version = parse_version(ctx, arg3);
-    } else if (read_flag("-quick_exit")) {
-      ctx.arg.quick_exit = true;
-    } else if (read_flag("-no_quick_exit")) {
-      ctx.arg.quick_exit = false;
-    } else if (read_flag("-random_uuid")) {
-      ctx.arg.uuid = UUID_RANDOM;
-    } else if (read_joined("-reexport-l")) {
-      remaining.push_back("-reexport-l");
-      remaining.push_back(std::string(arg));
-    } else if (read_arg("-rpath")) {
-      ctx.arg.rpath.push_back(std::string(arg));
-    } else if (read_flag("-search_paths_first")) {
-      ctx.arg.search_paths_first = true;
-    } else if (read_flag("-search_dylibs_first")) {
-      ctx.arg.search_paths_first = false;
-    } else if (read_arg3("-sectalign")) {
-      u64 val = parse_hex(ctx, arg3);
-      std::string key = std::string(arg) + "," + std::string(arg2);
-      if (!has_single_bit(val))
-        Fatal(ctx) << "-sectalign: invalid alignment value: " << arg3;
-      ctx.arg.sectalign.push_back({arg, arg2, (u8)std::countl_zero(val)});
-    } else if (read_arg3("-sectcreate")) {
-      ctx.arg.sectcreate.push_back({arg, arg2, arg3});
-    } else if (read_hex("-stack_size")) {
-      ctx.arg.stack_size = hex_arg;
-    } else if (read_flag("-stats")) {
-      ctx.arg.stats = true;
-      Counter::enabled = true;
-    } else if (read_arg("-syslibroot")) {
-      ctx.arg.syslibroot.push_back(std::string(arg));
-    } else if (read_flag("-t")) {
-      ctx.arg.trace = true;
-    } else if (read_arg("-thread_count")) {
-      ctx.arg.thread_count = std::stoi(std::string(arg));
-    } else if (read_arg("-u")) {
-      ctx.arg.u.push_back(std::string(arg));
-    } else if (read_arg("-unexported_symbol")) {
-      if (!ctx.arg.unexported_symbols_list.add(arg, 1))
-        Fatal(ctx) << "-unexported_symbol: invalid glob pattern: " << arg;
-    } else if (read_arg("-unexported_symbols_list")) {
-      for (std::string_view pat : read_lines(ctx, arg))
-        if (!ctx.arg.unexported_symbols_list.add(pat, 1))
-          Fatal(ctx) << "-unexported_symbols_list: " << arg
-                     << ": invalid glob pattern: " << pat;
-    } else if (read_flag("-v")) {
-      SyncOut(ctx) << mold_version;
-    } else if (read_arg("-weak_framework")) {
-      remaining.push_back("-weak_framework");
-      remaining.push_back(std::string(arg));
-    } else if (read_joined("-weak-l")) {
-      remaining.push_back("-weak-l");
-      remaining.push_back(std::string(arg));
-    } else {
-      if (args[i][0] == '-')
-        Fatal(ctx) << "unknown command line option: " << args[i];
-      remaining.push_back(std::string(args[i]));
-      i++;
-    }
-  }
-
-  if (!ctx.arg.entry)
-    ctx.arg.entry = get_symbol(ctx, "_main");
-
-  if (ctx.arg.thread_count == 0)
-    ctx.arg.thread_count = get_default_thread_count();
-
-  if (!ctx.arg.bundle_loader.empty() && ctx.output_type != MH_BUNDLE)
-    Fatal(ctx) << "-bundle_loader cannot be specified without -bundle";
-
-  auto add_search_path = [&](std::vector<std::string> &vec, std::string path) {
-    if (!path.starts_with('/') || ctx.arg.syslibroot.empty()) {
-      if (is_directory(path))
-        vec.push_back(path);
-      return;
-    }
-
-    bool found = false;
-    for (std::string &dir : ctx.arg.syslibroot) {
-      std::string str = path_clean(dir + "/" + path);
-      if (is_directory(str)) {
-        vec.push_back(str);
-        found = true;
-      }
-    }
-    if (!found && is_directory(path))
-      vec.push_back(path);
-  };
-
-  for (std::string &path : library_paths)
-    add_search_path(ctx.arg.library_paths, path);
-
-  if (!nostdlib) {
-    add_search_path(ctx.arg.library_paths, "/usr/lib");
-    add_search_path(ctx.arg.library_paths, "/usr/local/lib");
-  }
-
-  for (std::string &path : framework_paths)
-    add_search_path(ctx.arg.framework_paths, path);
-
-  if (!nostdlib) {
-    add_search_path(ctx.arg.framework_paths, "/Library/Frameworks");
-    add_search_path(ctx.arg.framework_paths, "/System/Library/Frameworks");
-  }
-
-  if (pagezero_size.has_value()) {
-    if (ctx.output_type != MH_EXECUTE)
-      Fatal(ctx) << "-pagezero_size option can only be used when"
-                 << " linking a main executable";
-    ctx.arg.pagezero_size = *pagezero_size;
-  } else {
-    ctx.arg.pagezero_size = (ctx.output_type == MH_EXECUTE) ? 0x100000000 : 0;
-  }
-
-  if (ctx.arg.final_output == "") {
-    if (ctx.arg.install_name != "")
-      ctx.arg.final_output = ctx.arg.install_name;
-    else
-      ctx.arg.final_output = ctx.arg.output;
-  }
-
-  if (ctx.arg.uuid == UUID_RANDOM)
-    memcpy(ctx.uuid, get_uuid_v4().data(), 16);
-
-  return remaining;
-}
-
-#define INSTANTIATE(E)                                                  \
-  template i64 parse_version(Context<E> &, std::string_view);           \
-  template std::vector<std::string> parse_nonpositional_args(Context<E> &)
-
-INSTANTIATE_ALL;
-
-} // namespace mold::macho

macho/dead-strip.cc

@@ -1,147 +0,0 @@
-#include "mold.h"
-
-#include <tbb/parallel_for_each.h>
-
-namespace mold::macho {
-
-template <typename E>
-static std::vector<Subsection<E> *> collect_root_set(Context<E> &ctx) {
-  Timer t(ctx, "collect_root_set");
-
-  std::vector<Subsection<E> *> rootset;
-
-  auto add = [&](Symbol<E> *sym) {
-    if (sym->subsec)
-      rootset.push_back(sym->subsec);
-  };
-
-  auto keep = [&](Symbol<E> *sym) {
-    if (sym->no_dead_strip)
-      return true;
-    if (ctx.output_type == MH_DYLIB || ctx.output_type == MH_BUNDLE)
-      if (sym->scope == SCOPE_EXTERN || sym->referenced_dynamically)
-        return true;
-    return false;
-  };
-
-  for (ObjectFile<E> *file : ctx.objs) {
-    for (Symbol<E> *sym : file->syms)
-      if (sym->file == file && keep(sym))
-        add(sym);
-
-    for (Subsection<E> *subsec : file->subsections)
-      if (const MachSection &hdr = subsec->isec.hdr;
-          (hdr.attr & S_ATTR_NO_DEAD_STRIP) ||
-          hdr.type == S_MOD_INIT_FUNC_POINTERS ||
-          hdr.type == S_MOD_TERM_FUNC_POINTERS)
-        rootset.push_back(subsec);
-  }
-
-  for (std::string_view name : ctx.arg.u)
-    if (Symbol<E> *sym = get_symbol(ctx, name); sym->file)
-      add(sym);
-
-  add(ctx.arg.entry);
-  add(get_symbol(ctx, "dyld_stub_binder"));
-  return rootset;
-}
-
-template <typename E>
-static void visit(Context<E> &ctx, Subsection<E> &subsec) {
-  if (subsec.is_alive.exchange(true))
-    return;
-
-  for (Relocation<E> &rel : subsec.get_rels()) {
-    if (rel.sym) {
-      if (rel.sym->subsec)
-        visit(ctx, *rel.sym->subsec);
-    } else {
-      visit(ctx, *rel.subsec);
-    }
-  }
-
-  for (UnwindRecord<E> &rec : subsec.get_unwind_records()) {
-    visit(ctx, *rec.subsec);
-    if (rec.lsda)
-      visit(ctx, *rec.lsda);
-    if (rec.personality && rec.personality->subsec)
-      visit(ctx, *rec.personality->subsec);
-  }
-}
-
-template <typename E>
-static bool refers_live_subsection(Subsection<E> &subsec) {
-  for (Relocation<E> &rel : subsec.get_rels()) {
-    if (rel.sym) {
-      if (rel.sym->subsec && rel.sym->subsec->is_alive)
-        return true;
-    } else {
-      if (rel.subsec->is_alive)
-        return true;
-    }
-  }
-  return false;
-}
-
-template <typename E>
-static void mark(Context<E> &ctx, const std::vector<Subsection<E> *> &rootset) {
-  Timer t(ctx, "mark");
-
-  tbb::parallel_for_each(ctx.objs, [](ObjectFile<E> *file) {
-    for (Subsection<E> *subsec : file->subsections)
-      subsec->is_alive.store(false, std::memory_order_relaxed);
-  });
-
-  std::atomic_thread_fence(std::memory_order_seq_cst);
-
-  for (Subsection<E> *subsec : rootset)
-    visit(ctx, *subsec);
-
-  bool repeat;
-  do {
-    repeat = false;
-    for (ObjectFile<E> *file : ctx.objs) {
-      for (Subsection<E> *subsec : file->subsections) {
-        if ((subsec->isec.hdr.attr & S_ATTR_LIVE_SUPPORT) &&
-            !subsec->is_alive &&
-            refers_live_subsection(*subsec)) {
-          visit(ctx, *subsec);
-          repeat = true;
-        }
-      }
-    }
-  } while (repeat);
-}
-
-template <typename E>
-static void sweep(Context<E> &ctx) {
-  Timer t(ctx, "sweep");
-
-  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
-    for (Symbol<E> *&sym : file->syms)
-      if (sym->file == file && sym->subsec && !sym->subsec->is_alive)
-        sym = nullptr;
-  });
-
-  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
-    std::erase_if(file->subsections, [](Subsection<E> *subsec) {
-      return !subsec->is_alive;
-    });
-  });
-}
-
-template <typename E>
-void dead_strip(Context<E> &ctx) {
-  Timer t(ctx, "dead_strip");
-
-  std::vector<Subsection<E> *> rootset = collect_root_set(ctx);
-  mark(ctx, rootset);
-  sweep(ctx);
-}
-
-#define INSTANTIATE(E)                          \
-  template void dead_strip(Context<E> &)
-
-INSTANTIATE_ALL;
-
-} // namespace mold::macho

macho/input-files.cc

@@ -1,983 +0,0 @@
-#include "mold.h"
-#include "../archive-file.h"
-
-namespace mold::macho {
-
-template <typename E>
-std::ostream &operator<<(std::ostream &out, const InputFile<E> &file) {
-  if (file.archive_name.empty())
-    out << path_clean(file.filename);
-  else
-    out << path_clean(file.archive_name) << "(" << path_clean(file.filename) + ")";
-  return out;
-}
-
-template <typename E>
-void InputFile<E>::clear_symbols() {
-  for (Symbol<E> *sym : syms) {
-    std::scoped_lock lock(sym->mu);
-    if (sym->file == this) {
-      sym->file = nullptr;
-      sym->scope = SCOPE_LOCAL;
-      sym->is_imported = false;
-      sym->is_weak = false;
-      sym->no_dead_strip = false;
-      sym->subsec = nullptr;
-      sym->value = 0;
-      sym->is_common = false;
-    }
-  }
-}
-
-template <typename E>
-ObjectFile<E> *
-ObjectFile<E>::create(Context<E> &ctx, MappedFile<Context<E>> *mf,
-                      std::string archive_name) {
-  ObjectFile<E> *obj = new ObjectFile<E>(mf);
-  obj->archive_name = archive_name;
-  obj->is_alive = archive_name.empty() || ctx.all_load;
-  obj->is_hidden = ctx.hidden_l;
-  ctx.obj_pool.emplace_back(obj);
-  return obj;
-};
-
-template <typename E>
-void ObjectFile<E>::parse(Context<E> &ctx) {
-  if (get_file_type(this->mf) == FileType::LLVM_BITCODE) {
-    // Open an compiler IR file
-    load_lto_plugin(ctx);
-    this->lto_module =
-      ctx.lto.module_create_from_memory(this->mf->data, this->mf->size);
-    if (!this->lto_module)
-      Fatal(ctx) << *this << ": lto_module_create_from_memory failed";
-
-    // Read a symbol table
-    parse_lto_symbols(ctx);
-    return;
-  }
-
-  parse_sections(ctx);
-  parse_symbols(ctx);
-
-  MachHeader &mach_hdr = *(MachHeader *)this->mf->data;
-  if (mach_hdr.flags & MH_SUBSECTIONS_VIA_SYMBOLS)
-    split_subsections_via_symbols(ctx);
-  else
-    init_subsections(ctx);
-
-  sort(subsections, [](Subsection<E> *a, Subsection<E> *b) {
-    return a->input_addr < b->input_addr;
-  });
-
-  fix_subsec_members(ctx);
-
-  for (std::unique_ptr<InputSection<E>> &isec : sections)
-    if (isec)
-      isec->parse_relocations(ctx);
-
-  if (unwind_sec)
-    parse_compact_unwind(ctx, *unwind_sec);
-}
-
-template <typename E>
-void ObjectFile<E>::parse_sections(Context<E> &ctx) {
-  SegmentCommand *cmd = (SegmentCommand *)find_load_command(ctx, LC_SEGMENT_64);
-  if (!cmd)
-    return;
-
-  MachSection *mach_sec = (MachSection *)((u8 *)cmd + sizeof(*cmd));
-
-  for (i64 i = 0; i < cmd->nsects; i++) {
-    MachSection &msec = mach_sec[i];
-    sections.push_back(nullptr);
-
-    if (msec.match("__LD", "__compact_unwind")) {
-      unwind_sec = &msec;
-      continue;
-    }
-
-    if (msec.match("__DATA", "__objc_imageinfo") ||
-        msec.match("__DATA_CONST", "__objc_imageinfo")) {
-      if (msec.size != sizeof(ObjcImageInfo))
-        Fatal(ctx) << *this << ": __objc_imageinfo: invalid size";
-
-      objc_image_info =
-        (ObjcImageInfo *)(this->mf->get_contents().data() + msec.offset);
-
-      if (objc_image_info->version != 0)
-        Fatal(ctx) << *this << ": __objc_imageinfo: unknown version: "
-                   << (u32)objc_image_info->version;
-      continue;
-    }
-
-    if (msec.attr & S_ATTR_DEBUG)
-      continue;
-
-    sections.back().reset(new InputSection<E>(ctx, *this, msec, i));
-  }
-}
-
-template <typename E>
-void ObjectFile<E>::parse_symbols(Context<E> &ctx) {
-  SymtabCommand *cmd = (SymtabCommand *)find_load_command(ctx, LC_SYMTAB);
-  if (!cmd)
-    return;
-
-  mach_syms = {(MachSym *)(this->mf->data + cmd->symoff), cmd->nsyms};
-  this->syms.reserve(mach_syms.size());
-
-  i64 nlocal = 0;
-  for (MachSym &msym : mach_syms)
-    if (!msym.is_extern)
-      nlocal++;
-  local_syms.reserve(nlocal);
-
-  for (i64 i = 0; i < mach_syms.size(); i++) {
-    MachSym &msym = mach_syms[i];
-    std::string_view name = (char *)(this->mf->data + cmd->stroff + msym.stroff);
-
-    if (msym.is_extern) {
-      this->syms.push_back(get_symbol(ctx, name));
-    } else {
-      local_syms.emplace_back(name);
-      Symbol<E> &sym = local_syms.back();
-
-      sym.file = this;
-      sym.subsec = nullptr;
-      sym.scope = SCOPE_LOCAL;
-      sym.is_common = false;
-      sym.is_weak = false;
-      if (msym.type == N_ABS)
-        sym.value = msym.value;
-      sym.no_dead_strip = (msym.desc & N_NO_DEAD_STRIP);
-      this->syms.push_back(&sym);
-    }
-  }
-}
-
-struct SplitRegion {
-  u32 offset;
-  u32 size;
-  u32 symidx;
-  bool is_alt_entry;
-};
-
-template <typename E>
-struct SplitInfo {
-  InputSection<E> *isec;
-  std::vector<SplitRegion> regions;
-};
-
-template <typename E>
-static std::vector<SplitInfo<E>>
-split_regular_sections(Context<E> &ctx, ObjectFile<E> &file) {
-  std::vector<SplitInfo<E>> vec(file.sections.size());
-
-  for (i64 i = 0; i < file.sections.size(); i++)
-    if (InputSection<E> *isec = file.sections[i].get())
-      if (isec->hdr.type != S_CSTRING_LITERALS)
-        vec[i].isec = isec;
-
-  // Find all symbols whose type is N_SECT.
-  for (i64 i = 0; i < file.mach_syms.size(); i++) {
-    MachSym &msym = file.mach_syms[i];
-    if (!msym.stab && msym.type == N_SECT && vec[msym.sect - 1].isec) {
-      SplitRegion r;
-      r.offset = msym.value - vec[msym.sect - 1].isec->hdr.addr;
-      r.symidx = i;
-      r.is_alt_entry = (msym.desc & N_ALT_ENTRY);
-      vec[msym.sect - 1].regions.push_back(r);
-    }
-  }
-
-  std::erase_if(vec, [](const SplitInfo<E> &info) { return !info.isec; });
-
-  sort(vec, [](const SplitInfo<E> &a, const SplitInfo<E> &b) {
-    return a.isec->hdr.addr < b.isec->hdr.addr;
-  });
-
-  for (SplitInfo<E> &info : vec) {
-    sort(info.regions, [](const SplitRegion &a, const SplitRegion &b) {
-      return a.offset < b.offset;
-    });
-  }
-
-  // If two symbols point to the same location, we create only one
-  // subsection.
-  for (SplitInfo<E> &info : vec) {
-    i64 last = -1;
-    for (SplitRegion &r : info.regions) {
-      if (!r.is_alt_entry) {
-        if (r.offset == last)
-          r.is_alt_entry = true;
-        last = r.offset;
-      }
-    }
-  }
-
-  // Fix regions so that they cover the entire section without overlapping.
-  for (SplitInfo<E> &info : vec) {
-    std::vector<SplitRegion> &r = info.regions;
-
-    if (r.empty()) {
-      r.push_back({0, (u32)info.isec->hdr.size, (u32)-1, false});
-      continue;
-    }
-
-    if (r[0].offset > 0)
-      r.insert(r.begin(), {0, r[0].offset, (u32)-1, false});
-
-    for (i64 i = 1; i < r.size(); i++)
-      if (r[i - 1].offset == r[i].offset)
-        r[i++].is_alt_entry = true;
-
-    i64 last = -1;
-    for (i64 i = 0; i < r.size(); i++) {
-      if (!r[i].is_alt_entry) {
-        if (last != -1)
-          r[last].size = r[i].offset - r[last].offset;
-        last = i;
-      }
-    }
-
-    if (last != -1)
-      r[last].size = info.isec->hdr.size - r[last].offset;
-  }
-  return vec;
-}
-
-template <typename E>
-void ObjectFile<E>::split_subsections_via_symbols(Context<E> &ctx) {
-  sym_to_subsec.resize(mach_syms.size());
-
-  auto add = [&](InputSection<E> &isec, u32 offset, u32 size, u8 p2align,
-                 bool is_cstring) {
-    Subsection<E> *subsec = new Subsection<E>{
-      .isec = isec,
-      .input_offset = offset,
-      .input_size = size,
-      .input_addr = (u32)(isec.hdr.addr + offset),
-      .p2align = p2align,
-      .is_cstring = is_cstring,
-    };
-
-    subsec_pool.emplace_back(subsec);
-    subsections.push_back(subsec);
-  };
-
-  // Split regular sections into subsections.
-  for (SplitInfo<E> &info : split_regular_sections(ctx, *this)) {
-    InputSection<E> &isec = *info.isec;
-    for (SplitRegion &r : info.regions) {
-      if (!r.is_alt_entry)
-        add(isec, r.offset, r.size, isec.hdr.p2align, false);
-      if (r.symidx != -1)
-        sym_to_subsec[r.symidx] = subsections.back();
-    }
-  }
-
-  // Split __cstring section.
-  for (std::unique_ptr<InputSection<E>> &isec : sections) {
-    if (isec && isec->hdr.type == S_CSTRING_LITERALS) {
-      std::string_view str = isec->contents;
-      size_t pos = 0;
-
-      while (pos < str.size()) {
-        size_t end = str.find('\0', pos);
-        if (end == str.npos)
-          Fatal(ctx) << *this << " corruupted cstring section: " << *isec;
-
-        end = str.find_first_not_of('\0', end);
-        if (end == str.npos)
-          end = str.size();
-
-        // A constant string in __cstring has no alignment info, so we
-        // need to infer it.
-        u8 p2align = std::min<u8>(isec->hdr.p2align, std::countr_zero(pos));
-        add(*isec, pos, end - pos, p2align, true);
-        pos = end;
-      }
-    }
-  }
-}
-
-template <typename E>
-void ObjectFile<E>::init_subsections(Context<E> &ctx) {
-  subsections.resize(sections.size());
-
-  for (i64 i = 0; i < sections.size(); i++) {
-    if (InputSection<E> *isec = sections[i].get()) {
-      Subsection<E> *subsec = new Subsection<E>{
-        .isec = *isec,
-        .input_offset = 0,
-        .input_size = (u32)isec->hdr.size,
-        .input_addr = (u32)isec->hdr.addr,
-        .p2align = (u8)isec->hdr.p2align,
-      };
-      subsec_pool.emplace_back(subsec);
-      subsections[i] = subsec;
-    }
-  }
-
-  sym_to_subsec.resize(mach_syms.size());
-
-  for (i64 i = 0; i < mach_syms.size(); i++) {
-    MachSym &msym = mach_syms[i];
-    if (!msym.stab && msym.type == N_SECT)
-      sym_to_subsec[i] = subsections[msym.sect - 1];
-  }
-
-  std::erase(subsections, nullptr);
-}
-
-// Fix local symbols `subsec` members.
-template <typename E>
-void ObjectFile<E>::fix_subsec_members(Context<E> &ctx) {
-  for (i64 i = 0; i < mach_syms.size(); i++) {
-    MachSym &msym = mach_syms[i];
-    Symbol<E> &sym = *this->syms[i];
-
-    if (!msym.stab && !msym.is_extern && msym.type == N_SECT) {
-      Subsection<E> *subsec = sym_to_subsec[i];
-      if (!subsec)
-        subsec = find_subsection(ctx, msym.sect - 1, msym.value);
-
-      if (subsec) {
-        sym.subsec = subsec;
-        sym.value = msym.value - subsec->input_addr;
-      } else {
-        // Subsec is null if a symbol is in a __compact_unwind.
-        sym.subsec = nullptr;
-        sym.value = msym.value;
-      }
-    }
-  }
-}
-
-template <typename E>
-void ObjectFile<E>::parse_data_in_code(Context<E> &ctx) {
-  if (auto *cmd = (LinkEditDataCommand *)find_load_command(ctx, LC_DATA_IN_CODE)) {
-    data_in_code_entries = {
-      (DataInCodeEntry *)(this->mf->data + cmd->dataoff),
-      cmd->datasize / sizeof(DataInCodeEntry),
-    };
-  }
-}
-
-template <typename E>
-std::vector<std::string> ObjectFile<E>::get_linker_options(Context<E> &ctx) {
-  if (get_file_type(this->mf) == FileType::LLVM_BITCODE)
-    return {};
-
-  MachHeader &hdr = *(MachHeader *)this->mf->data;
-  u8 *p = this->mf->data + sizeof(hdr);
-  std::vector<std::string> vec;
-
-  for (i64 i = 0; i < hdr.ncmds; i++) {
-    LoadCommand &lc = *(LoadCommand *)p;
-    p += lc.cmdsize;
-
-    if (lc.cmd == LC_LINKER_OPTION) {
-      LinkerOptionCommand *cmd = (LinkerOptionCommand *)&lc;
-      char *buf = (char *)cmd + sizeof(*cmd);
-      for (i64 i = 0; i < cmd->count; i++) {
-        vec.push_back(buf);
-        buf += vec.back().size() + 1;
-      }
-    }
-  }
-  return vec;
-}
-
-template <typename E>
-LoadCommand *ObjectFile<E>::find_load_command(Context<E> &ctx, u32 type) {
-  if (!this->mf)
-    return nullptr;
-
-  MachHeader &hdr = *(MachHeader *)this->mf->data;
-  u8 *p = this->mf->data + sizeof(hdr);
-
-  for (i64 i = 0; i < hdr.ncmds; i++) {
-    LoadCommand &lc = *(LoadCommand *)p;
-    if (lc.cmd == type)
-      return &lc;
-    p += lc.cmdsize;
-  }
-  return nullptr;
-}
-
-template <typename E>
-Subsection<E> *
-ObjectFile<E>::find_subsection(Context<E> &ctx, u32 secidx, u32 addr) {
-  Subsection<E> *ret = nullptr;
-  for (Subsection<E> *subsec : subsections)
-    if (subsec->isec.secidx == secidx && subsec->input_addr <= addr)
-      ret = subsec;
-  return ret;
-}
-
-template <typename E>
-Symbol<E> *ObjectFile<E>::find_symbol(Context<E> &ctx, u32 addr) {
-  for (i64 i = 0; i < mach_syms.size(); i++)
-    if (MachSym &msym = mach_syms[i]; msym.is_extern && msym.value == addr)
-      return this->syms[i];
-  return nullptr;
-}
-
-template <typename E>
-void ObjectFile<E>::parse_compact_unwind(Context<E> &ctx, MachSection &hdr) {
-  if (hdr.size % sizeof(CompactUnwindEntry))
-    Fatal(ctx) << *this << ": invalid __compact_unwind section size";
-
-  i64 num_entries = hdr.size / sizeof(CompactUnwindEntry);
-  unwind_records.reserve(num_entries);
-
-  CompactUnwindEntry *src = (CompactUnwindEntry *)(this->mf->data + hdr.offset);
-
-  // Read compact unwind entries
-  for (i64 i = 0; i < num_entries; i++)
-    unwind_records.emplace_back(src[i].code_len, src[i].encoding);
-
-  // Read relocations
-  MachRel *mach_rels = (MachRel *)(this->mf->data + hdr.reloff);
-  for (i64 i = 0; i < hdr.nreloc; i++) {
-    MachRel &r = mach_rels[i];
-    if (r.offset >= hdr.size)
-      Fatal(ctx) << *this << ": relocation offset too large: " << i;
-
-    i64 idx = r.offset / sizeof(CompactUnwindEntry);
-    UnwindRecord<E> &dst = unwind_records[idx];
-
-    auto error = [&] {
-      Fatal(ctx) << *this << ": __compact_unwind: unsupported relocation: " << i
-                 << " " << *this->syms[r.idx];
-    };
-
-    if (r.is_pcrel || r.p2size != 3 || r.type)
-      error();
-
-    switch (r.offset % sizeof(CompactUnwindEntry)) {
-    case offsetof(CompactUnwindEntry, code_start): {
-      Subsection<E> *target;
-      if (r.is_extern)
-        target = sym_to_subsec[r.idx];
-      else
-        target = find_subsection(ctx, r.idx - 1, src[idx].code_start);
-
-      if (!target)
-        error();
-
-      dst.subsec = target;
-      dst.offset = src[idx].code_start - target->input_addr;
-      break;
-    }
-    case offsetof(CompactUnwindEntry, personality):
-      if (r.is_extern) {
-        dst.personality = this->syms[r.idx];
-      } else {
-        u32 addr = *(ul32 *)((u8 *)this->mf->data + hdr.offset + r.offset);
-        dst.personality = find_symbol(ctx, addr);
-      }
-
-      if (!dst.personality)
-        Fatal(ctx) << *this << ": __compact_unwind: unsupported "
-                   << "personality reference: " << i;
-      break;
-    case offsetof(CompactUnwindEntry, lsda): {
-      u32 addr = *(ul32 *)((u8 *)this->mf->data + hdr.offset + r.offset);
-
-      Subsection<E> *target;
-      if (r.is_extern)
-        target = sym_to_subsec[r.idx];
-      else
-        target = find_subsection(ctx, r.idx - 1, addr);
-
-      if (!target)
-        error();
-
-      dst.lsda = target;
-      dst.lsda_offset = addr - target->input_addr;
-      break;
-    }
-    default:
-      error();
-    }
-  }
-
-  for (i64 i = 0; i < num_entries; i++)
-    if (!unwind_records[i].subsec)
-      Fatal(ctx) << "__compact_unwind: missing relocation at " << i;
-
-  // Sort unwind entries by offset
-  sort(unwind_records, [](const UnwindRecord<E> &a, const UnwindRecord<E> &b) {
-    return std::tuple(a.subsec->input_addr, a.offset) <
-           std::tuple(b.subsec->input_addr, b.offset);
-  });
-
-  // Associate unwind entries to subsections
-  for (i64 i = 0; i < num_entries;) {
-    Subsection<E> &subsec = *unwind_records[i].subsec;
-    subsec.unwind_offset = i;
-
-    i64 j = i + 1;
-    while (j < num_entries && unwind_records[j].subsec == &subsec)
-      j++;
-    subsec.nunwind = j - i;
-    i = j;
-  }
-}
-
-// Symbols with higher priorities overwrites symbols with lower priorities.
-// Here is the list of priorities, from the highest to the lowest.
-//
-//  1. Strong defined symbol
-//  2. Weak defined symbol
-//  3. Strong defined symbol in a DSO/archive
-//  4. Weak Defined symbol in a DSO/archive
-//  5. Common symbol
-//  6. Common symbol in an archive
-//  7. Unclaimed (nonexistent) symbol
-//
-// Ties are broken by file priority.
-template <typename E>
-static u64 get_rank(InputFile<E> *file, bool is_common, bool is_weak) {
-  if (is_common) {
-    assert(!file->is_dylib);
-    if (!file->is_alive)
-      return (6 << 24) + file->priority;
-    return (5 << 24) + file->priority;
-  }
-
-  if (file->is_dylib || !file->is_alive) {
-    if (is_weak)
-      return (4 << 24) + file->priority;
-    return (3 << 24) + file->priority;
-  }
-
-  if (is_weak)
-    return (2 << 24) + file->priority;
-  return (1 << 24) + file->priority;
-}
-
-template <typename E>
-static u64 get_rank(Symbol<E> &sym) {
-  if (!sym.file)
-    return 7 << 24;
-  return get_rank(sym.file, sym.is_common, sym.is_weak);
-}
-
-template <typename E>
-void ObjectFile<E>::resolve_symbols(Context<E> &ctx) {
-  auto is_private_extern = [&](MachSym &msym) {
-    return this->is_hidden || msym.is_private_extern ||
-           ((msym.desc & N_WEAK_REF) && (msym.desc & N_WEAK_DEF));
-  };
-
-  auto merge_scope = [&](Symbol<E> &sym, MachSym &msym) {
-    // If at least one symbol defines it as an EXTERN symbol,
-    // the result is an EXTERN symbol instead of PRIVATE_EXTERN,
-    // so that the symbol is exported.
-    if (sym.scope == SCOPE_EXTERN)
-      return SCOPE_EXTERN;
-    return is_private_extern(msym) ? SCOPE_PRIVATE_EXTERN : SCOPE_EXTERN;
-  };
-
-  for (i64 i = 0; i < this->syms.size(); i++) {
-    MachSym &msym = mach_syms[i];
-    if (!msym.is_extern || msym.is_undef())
-      continue;
-
-    Symbol<E> &sym = *this->syms[i];
-    std::scoped_lock lock(sym.mu);
-    bool is_weak = (msym.desc & N_WEAK_DEF);
-
-    sym.scope = merge_scope(sym, msym);
-
-    if (get_rank(this, msym.is_common(), is_weak) < get_rank(sym)) {
-      sym.file = this;
-      sym.is_imported = false;
-      sym.is_weak = is_weak;
-      sym.no_dead_strip = (msym.desc & N_NO_DEAD_STRIP);
-
-      switch (msym.type) {
-      case N_UNDF:
-        assert(msym.is_common());
-        sym.subsec = nullptr;
-        sym.value = msym.value;
-        sym.is_common = true;
-        break;
-      case N_ABS:
-        sym.subsec = nullptr;
-        sym.value = msym.value;
-        sym.is_common = false;
-        break;
-      case N_SECT:
-        sym.subsec = sym_to_subsec[i];
-        sym.value = msym.value - sym.subsec->input_addr;
-        sym.is_common = false;
-        break;
-      default:
-        Fatal(ctx) << sym << ": unknown symbol type: " << (u64)msym.type;
-      }
-    }
-  }
-}
-
-template <typename E>
-bool ObjectFile<E>::is_objc_object(Context<E> &ctx) {
-  for (std::unique_ptr<InputSection<E>> &isec : sections)
-    if (isec)
-      if (isec->hdr.match("__DATA", "__objc_catlist") ||
-          (isec->hdr.get_segname() == "__TEXT" &&
-           isec->hdr.get_sectname().starts_with("__swift")))
-        return true;
-
-  for (i64 i = 0; i < this->syms.size(); i++)
-    if (!mach_syms[i].is_undef() && mach_syms[i].is_extern &&
-        this->syms[i]->name.starts_with("_OBJC_CLASS_$_"))
-      return true;
-
-  return false;
-}
-
-template <typename E>
-void
-ObjectFile<E>::mark_live_objects(Context<E> &ctx,
-                                 std::function<void(ObjectFile<E> *)> feeder) {
-  assert(this->is_alive);
-
-  for (i64 i = 0; i < this->syms.size(); i++) {
-    MachSym &msym = mach_syms[i];
-    if (!msym.is_extern)
-      continue;
-
-    Symbol<E> &sym = *this->syms[i];
-    std::scoped_lock lock(sym.mu);
-    if (!sym.file)
-      continue;
-
-    if (msym.is_undef() || (msym.is_common() && !sym.is_common))
-      if (InputFile<E> *file = sym.file)
-        if (!file->is_alive.exchange(true) && !file->is_dylib)
-          feeder((ObjectFile<E> *)file);
-  }
-
-  for (Subsection<E> *subsec : subsections)
-    for (UnwindRecord<E> &rec : subsec->get_unwind_records())
-      if (Symbol<E> *sym = rec.personality)
-        if (InputFile<E> *file = sym->file)
-          if (!file->is_alive.exchange(true) && !file->is_dylib)
-            feeder((ObjectFile<E> *)file);
-}
-
-template <typename E>
-void ObjectFile<E>::convert_common_symbols(Context<E> &ctx) {
-  for (i64 i = 0; i < this->mach_syms.size(); i++) {
-    Symbol<E> &sym = *this->syms[i];
-    MachSym &msym = mach_syms[i];
-
-    if (sym.file == this && sym.is_common) {
-      InputSection<E> *isec = get_common_sec(ctx);
-      Subsection<E> *subsec = new Subsection<E>{
-        .isec = *isec,
-        .input_size = (u32)msym.value,
-        .p2align = (u8)msym.common_p2align,
-      };
-
-      subsections.emplace_back(subsec);
-
-      sym.is_imported = false;
-      sym.is_weak = false;
-      sym.no_dead_strip = (msym.desc & N_NO_DEAD_STRIP);
-      sym.subsec = subsec;
-      sym.value = 0;
-      sym.is_common = false;
-    }
-  }
-}
-
-template <typename E>
-void ObjectFile<E>::check_duplicate_symbols(Context<E> &ctx) {
-  for (i64 i = 0; i < this->mach_syms.size(); i++) {
-    Symbol<E> *sym = this->syms[i];
-    MachSym &msym = mach_syms[i];
-    if (sym && sym->file && sym->file != this && !msym.is_undef() &&
-        !msym.is_common() && !(msym.desc & N_WEAK_DEF))
-      Error(ctx) << "duplicate symbol: " << *this << ": " << *sym->file
-                 << ": " << *sym;
-  }
-}
-
-template <typename E>
-InputSection<E> *ObjectFile<E>::get_common_sec(Context<E> &ctx) {
-  if (!common_sec) {
-    MachSection *hdr = new MachSection;
-    common_hdr.reset(hdr);
-
-    memset(hdr, 0, sizeof(*hdr));
-    hdr->set_segname("__DATA");
-    hdr->set_sectname("__common");
-    hdr->type = S_ZEROFILL;
-
-    common_sec = new InputSection<E>(ctx, *this, *hdr, sections.size());
-    sections.emplace_back(common_sec);
-  }
-  return common_sec;
-}
-
-template <typename E>
-void ObjectFile<E>::parse_lto_symbols(Context<E> &ctx) {
-  i64 nsyms = ctx.lto.module_get_num_symbols(this->lto_module);
-  this->syms.reserve(nsyms);
-  this->mach_syms2.reserve(nsyms);
-
-  for (i64 i = 0; i < nsyms; i++) {
-    std::string_view name = ctx.lto.module_get_symbol_name(this->lto_module, i);
-    this->syms.push_back(get_symbol(ctx, name));
-
-    u32 attr = ctx.lto.module_get_symbol_attribute(this->lto_module, i);
-    MachSym msym = {};
-
-    switch (attr & LTO_SYMBOL_DEFINITION_MASK) {
-    case LTO_SYMBOL_DEFINITION_REGULAR:
-    case LTO_SYMBOL_DEFINITION_TENTATIVE:
-    case LTO_SYMBOL_DEFINITION_WEAK:
-      msym.type = N_ABS;
-      break;
-    case LTO_SYMBOL_DEFINITION_UNDEFINED:
-    case LTO_SYMBOL_DEFINITION_WEAKUNDEF:
-      msym.type = N_UNDF;
-      break;
-    default:
-      unreachable();
-    }
-
-    switch (attr & LTO_SYMBOL_SCOPE_MASK) {
-    case 0:
-    case LTO_SYMBOL_SCOPE_INTERNAL:
-    case LTO_SYMBOL_SCOPE_HIDDEN:
-      break;
-    case LTO_SYMBOL_SCOPE_DEFAULT:
-    case LTO_SYMBOL_SCOPE_PROTECTED:
-    case LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN:
-      msym.is_extern = true;
-      break;
-    default:
-      unreachable();
-    }
-
-    mach_syms2.push_back(msym);
-  }
-
-  mach_syms = mach_syms2;
-}
-
-template <typename E>
-std::string_view ObjectFile<E>::get_linker_optimization_hints(Context<E> &ctx) {
-  LinkEditDataCommand *cmd =
-    (LinkEditDataCommand *)find_load_command(ctx, LC_LINKER_OPTIMIZATION_HINT);
-
-  if (cmd)
-    return {(char *)this->mf->data + cmd->dataoff, cmd->datasize};
-  return {};
-}
-
-template <typename E>
-DylibFile<E>::DylibFile(Context<E> &ctx, MappedFile<Context<E>> *mf)
-  : InputFile<E>(mf) {
-  this->is_dylib = true;
-  this->is_alive = (ctx.needed_l || !ctx.arg.dead_strip_dylibs);
-  this->is_weak = ctx.weak_l;
-  this->is_reexported = ctx.reexport_l;
-  ctx.dylib_pool.emplace_back(this);
-}
-
-template <typename E>
-DylibFile<E> *DylibFile<E>::create(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  DylibFile<E> *file = new DylibFile<E>(ctx, mf);
-  file->parse(ctx);
-  return file;
-}
-
-template <typename E>
-static MappedFile<Context<E>> *
-find_external_lib(Context<E> &ctx, std::string_view parent, std::string path) {
-  if (!path.starts_with('/'))
-    return MappedFile<Context<E>>::open(ctx, path);
-
-  for (const std::string &root : ctx.arg.syslibroot) {
-    if (path.ends_with(".tbd")) {
-      if (auto *file = MappedFile<Context<E>>::open(ctx, root + path))
-        return file;
-      continue;
-    }
-
-    if (path.ends_with(".dylib")) {
-      std::string stem(path.substr(0, path.size() - 6));
-      if (auto *file = MappedFile<Context<E>>::open(ctx, root + stem + ".tbd"))
-        return file;
-      if (auto *file = MappedFile<Context<E>>::open(ctx, root + path))
-        return file;
-    }
-
-    for (std::string extn : {".tbd", ".dylib"})
-      if (auto *file = MappedFile<Context<E>>::open(ctx, root + path + extn))
-        return file;
-  }
-
-  return nullptr;
-}
-
-template <typename E>
-void DylibFile<E>::parse(Context<E> &ctx) {
-  switch (get_file_type(this->mf)) {
-  case FileType::TAPI:
-    parse_tapi(ctx);
-    break;
-  case FileType::MACH_DYLIB:
-    parse_dylib(ctx);
-    break;
-  case FileType::MACH_EXE:
-    parse_dylib(ctx);
-    dylib_idx = BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE;
-    break;
-  default:
-    Fatal(ctx) << *this << ": is not a dylib";
-  }
-
-  // Read reexported libraries if any
-  for (std::string_view path : reexported_libs) {
-    MappedFile<Context<E>> *mf =
-      find_external_lib(ctx, install_name, std::string(path));
-    if (!mf)
-      Fatal(ctx) << install_name << ": cannot open reexported library " << path;
-
-    DylibFile<E> *child = DylibFile<E>::create(ctx, mf);
-    exports.merge(child->exports);
-    weak_exports.merge(child->weak_exports);
-  }
-
-  // Initialize syms and is_weak_symbols vectors
-  for (std::string_view s : exports) {
-    this->syms.push_back(get_symbol(ctx, s));
-    is_weak_symbol.push_back(false);
-  }
-
-  for (std::string_view s : weak_exports) {
-    if (!exports.contains(s)) {
-      this->syms.push_back(get_symbol(ctx, s));
-      is_weak_symbol.push_back(true);
-    }
-  }
-}
-
-template <typename E>
-void DylibFile<E>::read_trie(Context<E> &ctx, u8 *start, i64 offset,
-                             const std::string &prefix) {
-  u8 *buf = start + offset;
-
-  if (*buf) {
-    read_uleb(buf); // size
-    i64 flags = read_uleb(buf) & ~EXPORT_SYMBOL_FLAGS_KIND_MASK;
-    read_uleb(buf); // addr
-
-    std::string_view name = save_string(ctx, prefix);
-    if (flags & EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION)
-      weak_exports.insert(name);
-    else
-      exports.insert(name);
-
-    if (flags & EXPORT_SYMBOL_FLAGS_REEXPORT)
-      read_uleb(buf); // skip a library ordinal
-  } else {
-    buf++;
-  }
-
-  i64 nchild = *buf++;
-
-  for (i64 i = 0; i < nchild; i++) {
-    std::string suffix((char *)buf);
-    buf += suffix.size() + 1;
-    i64 off = read_uleb(buf);
-    read_trie(ctx, start, off, prefix + suffix);
-  }
-}
-
-template <typename E>
-void DylibFile<E>::parse_tapi(Context<E> &ctx) {
-  TextDylib tbd = parse_tbd(ctx, this->mf);
-
-  install_name = tbd.install_name;
-  reexported_libs = std::move(tbd.reexported_libs);
-  exports = std::move(tbd.exports);
-  weak_exports = std::move(tbd.weak_exports);
-}
-
-template <typename E>
-void DylibFile<E>::parse_dylib(Context<E> &ctx) {
-  MachHeader &hdr = *(MachHeader *)this->mf->data;
-  u8 *p = this->mf->data + sizeof(hdr);
-
-  if (ctx.arg.application_extension && !(hdr.flags & MH_APP_EXTENSION_SAFE))
-    Warn(ctx) << "linking against a dylib which is not safe for use in "
-              << "application extensions: " << *this;
-
-  for (i64 i = 0; i < hdr.ncmds; i++) {
-    LoadCommand &lc = *(LoadCommand *)p;
-
-    switch (lc.cmd) {
-    case LC_ID_DYLIB: {
-      DylibCommand &cmd = *(DylibCommand *)p;
-      install_name = (char *)p + cmd.nameoff;
-      break;
-    }
-    case LC_DYLD_INFO_ONLY: {
-      DyldInfoCommand &cmd = *(DyldInfoCommand *)p;
-      if (cmd.export_off)
-        read_trie(ctx, this->mf->data + cmd.export_off);
-      break;
-    }
-    case LC_DYLD_EXPORTS_TRIE: {
-      LinkEditDataCommand &cmd = *(LinkEditDataCommand *)p;
-      read_trie(ctx, this->mf->data + cmd.dataoff);
-      break;
-    }
-    case LC_REEXPORT_DYLIB:
-      if (!(hdr.flags & MH_NO_REEXPORTED_DYLIBS)) {
-        DylibCommand &cmd = *(DylibCommand *)p;
-        reexported_libs.push_back((char *)p + cmd.nameoff);
-      }
-      break;
-    }
-    p += lc.cmdsize;
-  }
-}
-
-template <typename E>
-void DylibFile<E>::resolve_symbols(Context<E> &ctx) {
-  for (i64 i = 0; i < this->syms.size(); i++) {
-    Symbol<E> &sym = *this->syms[i];
-    std::scoped_lock lock(sym.mu);
-
-    if (get_rank(this, false, false) < get_rank(sym)) {
-      sym.file = this;
-      sym.scope = SCOPE_LOCAL;
-      sym.is_imported = true;
-      sym.is_weak = (this->is_weak || is_weak_symbol[i]);
-      sym.no_dead_strip = false;
-      sym.subsec = nullptr;
-      sym.value = 0;
-      sym.is_common = false;
-    }
-  }
-}
-
-#define INSTANTIATE(E)                                                  \
-  template class InputFile<E>;                                          \
-  template class ObjectFile<E>;                                         \
-  template class DylibFile<E>;                                          \
-  template std::ostream &operator<<(std::ostream &, const InputFile<E> &)
-
-INSTANTIATE_ALL;
-
-} // namespace mold::macho

macho/input-sections.cc

@@ -1,72 +0,0 @@
-#include "mold.h"
-
-namespace mold::macho {
-
-template <typename E>
-OutputSection<E> &get_output_section(Context<E> &ctx, const MachSection &hdr) {
-  static std::unordered_set<std::string_view> set = {
-    "__got", "__auth_got", "__auth_ptr", "__nl_symbol_ptr", "__const",
-    "__cfstring", "__mod_init_func", "__mod_term_func", "__objc_classlist",
-    "__objc_nlclslist", "__objc_catlist", "__objc_nlcatlist", "__objc_protolist",
-  };
-
-  std::string_view seg = hdr.get_segname();
-  std::string_view sect = hdr.get_sectname();
-
-  if (seg == "__DATA" && set.contains(sect)) {
-    seg = "__DATA_CONST";
-  } else if (seg == "__TEXT" && sect == "__StaticInit") {
-    sect = "__text";
-  }
-
-  return *OutputSection<E>::get_instance(ctx, seg, sect);
-}
-
-template <typename E>
-InputSection<E>::InputSection(Context<E> &ctx, ObjectFile<E> &file,
-                              const MachSection &hdr, u32 secidx)
-  : file(file), hdr(hdr), secidx(secidx), osec(get_output_section(ctx, hdr)) {
-  if (hdr.type != S_ZEROFILL)
-    contents = file.mf->get_contents().substr(hdr.offset, hdr.size);
-}
-
-template <typename E>
-void InputSection<E>::parse_relocations(Context<E> &ctx) {
-  // Parse mach-o relocations to fill `rels` vector
-  rels = read_relocations(ctx, file, hdr);
-
-  // Sort `rels` vector
-  sort(rels, [](const Relocation<E> &a, const Relocation<E> &b) {
-    return a.offset < b.offset;
-  });
-
-  // Find subsections this relocation section refers to
-  auto cmp = [](Subsection<E> *subsec, u32 addr) {
-    return subsec->input_addr < addr;
-  };
-
-  auto begin = std::lower_bound(file.subsections.begin(),
-                                file.subsections.end(), hdr.addr, cmp);
-  auto end = std::lower_bound(begin, file.subsections.end(),
-                              hdr.addr + hdr.size, cmp);
-
-  // Assign each subsection a group of relocations
-  i64 i = 0;
-  for (auto it = begin; it < end; it++) {
-    Subsection<E> &subsec = **it;
-    subsec.rel_offset = i;
-    while (i < rels.size() &&
-           rels[i].offset < subsec.input_offset + subsec.input_size) {
-      rels[i].offset -= subsec.input_offset;
-      i++;
-    }
-    subsec.nrels = i - subsec.rel_offset;
-  }
-}
-
-#define INSTANTIATE(E)                          \
-  template class InputSection<E>
-
-INSTANTIATE_ALL;
-
-} // namespace mold::macho

macho/lto-unix.cc

@@ -1,164 +0,0 @@
-#include "lto.h"
-#include "mold.h"
-
-#include <algorithm>
-#include <cstdio>
-#include <dlfcn.h>
-#include <unistd.h>
-
-namespace mold::macho {
-
-LTOPlugin::~LTOPlugin() {
-  if (dlopen_handle)
-    dlclose(dlopen_handle);
-}
-
-template <typename E>
-static void do_load_plugin(Context<E> &ctx) {
-  void *handle = dlopen(ctx.arg.lto_library.c_str(), RTLD_NOW | RTLD_GLOBAL);
-  if (!handle)
-    Fatal(ctx) << "could not open plugin file: " << dlerror();
-
-  ctx.lto.dlopen_handle = handle;
-
-  // I don't want to use a macro, but I couldn't find an easy way to
-  // write the same thing without a macro.
-#define DLSYM(x) ctx.lto.x = (decltype(ctx.lto.x))dlsym(handle, "lto_" #x)
-  DLSYM(get_version);
-  DLSYM(get_error_message);
-  DLSYM(module_is_object_file);
-  DLSYM(module_is_object_file_for_target);
-  DLSYM(module_has_objc_category);
-  DLSYM(module_is_object_file_in_memory);
-  DLSYM(module_is_object_file_in_memory_for_target);
-  DLSYM(module_create);
-  DLSYM(module_create_from_memory);
-  DLSYM(module_create_from_memory_with_path);
-  DLSYM(module_create_in_local_context);
-  DLSYM(module_create_in_codegen_context);
-  DLSYM(module_create_from_fd);
-  DLSYM(module_create_from_fd_at_offset);
-  DLSYM(module_dispose);
-  DLSYM(module_get_target_triple);
-  DLSYM(module_set_target_triple);
-  DLSYM(module_get_num_symbols);
-  DLSYM(module_get_symbol_name);
-  DLSYM(module_get_symbol_attribute);
-  DLSYM(module_get_linkeropts);
-  DLSYM(module_get_macho_cputype);
-  DLSYM(module_has_ctor_dtor);
-  DLSYM(codegen_set_diagnostic_handler);
-  DLSYM(codegen_create);
-  DLSYM(codegen_create_in_local_context);
-  DLSYM(codegen_dispose);
-  DLSYM(codegen_add_module);
-  DLSYM(codegen_set_module);
-  DLSYM(codegen_set_debug_model);
-  DLSYM(codegen_set_pic_model);
-  DLSYM(codegen_set_cpu);
-  DLSYM(codegen_set_assembler_path);
-  DLSYM(codegen_set_assembler_args);
-  DLSYM(codegen_add_must_preserve_symbol);
-  DLSYM(codegen_write_merged_modules);
-  DLSYM(codegen_compile);
-  DLSYM(codegen_compile_to_file);
-  DLSYM(codegen_optimize);
-  DLSYM(codegen_compile_optimized);
-  DLSYM(api_version);
-  DLSYM(set_debug_options);
-  DLSYM(codegen_debug_options);
-  DLSYM(codegen_debug_options_array);
-  DLSYM(initialize_disassembler);
-  DLSYM(codegen_set_should_internalize);
-  DLSYM(codegen_set_should_embed_uselists);
-#undef DLSYM
-}
-
-template <typename E>
-void load_lto_plugin(Context<E> &ctx) {
-  std::call_once(ctx.lto_plugin_loaded, [&]() { do_load_plugin(ctx); });
-}
-
-template <typename E>
-void do_lto(Context<E> &ctx) {
-  LTOCodeGen *cg = ctx.lto.codegen_create();
-
-  // Add bitcode files to CodeGen.
-  for (const std::string &opt : ctx.arg.mllvm)
-    ctx.lto.codegen_debug_options(cg, opt.c_str());
-
-  for (ObjectFile<E> *file : ctx.objs)
-    if (file->lto_module)
-      ctx.lto.codegen_add_module(cg, file->lto_module);
-
-  // Mark symbols that have to be preserved. All symbols that are not
-  // marked here may be internalized and deleted as an extenrally-
-  // visible symbol.
-  if (ctx.output_type == MH_DYLIB || ctx.arg.export_dynamic) {
-    for (ObjectFile<E> *file : ctx.objs) {
-      if (!file->lto_module) {
-        for (i64 i = 0; i < file->mach_syms.size(); i++) {
-          MachSym &msym = file->mach_syms[i];
-          Symbol<E> &sym = *file->syms[i];
-          if (msym.is_undef() && !sym.file->is_dylib &&
-              ((ObjectFile<E> *)sym.file)->lto_module)
-            ctx.lto.codegen_add_must_preserve_symbol(cg, sym.name.data());
-        }
-      }
-    }
-
-    for (ObjectFile<E> *file : ctx.objs)
-      if (file->lto_module)
-        for (Symbol<E> *sym : file->syms)
-          if (sym->file == file && sym->scope != SCOPE_LOCAL)
-            ctx.lto.codegen_add_must_preserve_symbol(cg, sym->name.data());
-  }
-
-  if (ctx.arg.entry->file)
-    ctx.lto.codegen_add_must_preserve_symbol(cg, ctx.arg.entry->name.data());
-
-  // Run the compiler backend to do LTO.
-  size_t size;
-  u8 *data = (u8 *)ctx.lto.codegen_compile(cg, &size);
-  if (!data)
-    Fatal(ctx) << "lto_codegen_compile failed: " << ctx.lto.get_error_message();
-
-  if (!ctx.arg.object_path_lto.empty()) {
-    FILE *out = fopen(ctx.arg.object_path_lto.c_str(), "w");
-    if (!out)
-      Fatal(ctx) << "-object_path_lto: cannot open " << ctx.arg.object_path_lto
-                 << ": " << errno_string();
-    fwrite(data, size, 1, out);
-    fclose(out);
-  }
-
-  // Remove bitcode object files from ctx.objs.
-  for (ObjectFile<E> *file : ctx.objs) {
-    if (file->lto_module) {
-      file->clear_symbols();
-      file->is_alive = false;
-    }
-  }
-
-  // Add a result of LTO as a new object file.
-  MappedFile<Context<E>> *mf = new MappedFile<Context<E>>;
-  mf->name = "<LTO>";
-  mf->data = data;
-  mf->size = size;
-  ctx.mf_pool.emplace_back(mf);
-
-  ObjectFile<E> *obj = ObjectFile<E>::create(ctx, mf, "");
-  obj->parse(ctx);
-  obj->is_alive = true;
-  obj->priority = 100; // regular file starts with priority 10,000
-  obj->resolve_symbols(ctx);
-  ctx.objs.push_back(obj);
-}
-
-#define INSTANTIATE(E)                         \
-  template void load_lto_plugin(Context<E> &); \
-  template void do_lto(Context<E> &);
-
-INSTANTIATE_ALL;
-
-} // namespace mold::macho

macho/lto-win32.cc

@@ -1,26 +0,0 @@
-#ifdef _WIN32
-
-#include "lto.h"
-#include "mold.h"
-
-namespace mold::macho {
-
-LTOPlugin::~LTOPlugin() {}
-
-template <typename E>
-void load_lto_plugin(Context<E> &ctx) {
-  Fatal(ctx) << "LTO is not supported on Windows";
-}
-
-template <typename E>
-void do_lto(Context<E> &ctx) {}
-
-#define INSTANTIATE(E)                         \
-  template void load_lto_plugin(Context<E> &); \
-  template void do_lto(Context<E> &);
-
-INSTANTIATE_ALL;
-
-} // namespace mold::macho
-
-#endif

macho/lto.h

@@ -1,176 +0,0 @@
-#pragma once
-
-#include <cstddef>
-#include <cstdint>
-#include <sys/types.h>
-
-namespace mold::macho {
-
-enum LTOSymbolAttributes {
-  LTO_SYMBOL_ALIGNMENT_MASK = 0x0000001F,
-  LTO_SYMBOL_PERMISSIONS_MASK = 0x000000E0,
-  LTO_SYMBOL_PERMISSIONS_CODE = 0x000000A0,
-  LTO_SYMBOL_PERMISSIONS_DATA = 0x000000C0,
-  LTO_SYMBOL_PERMISSIONS_RODATA = 0x00000080,
-  LTO_SYMBOL_DEFINITION_MASK = 0x00000700,
-  LTO_SYMBOL_DEFINITION_REGULAR = 0x00000100,
-  LTO_SYMBOL_DEFINITION_TENTATIVE = 0x00000200,
-  LTO_SYMBOL_DEFINITION_WEAK = 0x00000300,
-  LTO_SYMBOL_DEFINITION_UNDEFINED = 0x00000400,
-  LTO_SYMBOL_DEFINITION_WEAKUNDEF = 0x00000500,
-  LTO_SYMBOL_SCOPE_MASK = 0x00003800,
-  LTO_SYMBOL_SCOPE_INTERNAL = 0x00000800,
-  LTO_SYMBOL_SCOPE_HIDDEN = 0x00001000,
-  LTO_SYMBOL_SCOPE_DEFAULT = 0x00001800,
-  LTO_SYMBOL_SCOPE_PROTECTED = 0x00002000,
-  LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN = 0x00002800,
-  LTO_SYMBOL_COMDAT = 0x00004000,
-  LTO_SYMBOL_ALIAS = 0x00008000,
-};
-
-enum LTODebugModel {
-  LTO_DEBUG_MODEL_NONE = 0,
-  LTO_DEBUG_MODEL_DWARF = 1,
-};
-
-enum LTOCodegenModel {
-  LTO_CODEGEN_PIC_MODEL_STATIC = 0,
-  LTO_CODEGEN_PIC_MODEL_DYNAMIC = 1,
-  LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC = 2,
-  LTO_CODEGEN_PIC_MODEL_DEFAULT = 3,
-};
-
-enum LTOCodegenDiagnosticSeverity {
-  LTO_DS_ERROR = 0,
-  LTO_DS_WARNING = 1,
-  LTO_DS_REMARK = 3,
-  LTO_DS_NOTE = 2,
-};
-
-struct LTOObjectBuffer {
-  const char *buffer;
-  size_t size;
-};
-
-using LTOModule = void;
-using LTOCodeGen = void;
-
-typedef void LTODiagnosticHandler(LTOCodegenDiagnosticSeverity severity,
-                                  const char *diag, void *ctxt);
-
-struct LTOPlugin {
-  void *dlopen_handle = nullptr;
-  ~LTOPlugin();
-
-  char (*get_version)();
-
-  char (*get_error_message)();
-
-  bool (*module_is_object_file)(const char *path);
-
-  bool (*module_is_object_file_for_target)(const char *path,
-                                           const char *target_triple_prefix);
-
-  bool (*module_has_objc_category)(const void *mem, size_t length);
-
-  bool (*module_is_object_file_in_memory)(const void *mem, size_t length);
-
-  bool (*module_is_object_file_in_memory_for_target)(
-      const void *mem, size_t length, const char *target_triple_prefix);
-
-  LTOModule *(*module_create)(const char *path);
-
-  LTOModule *(*module_create_from_memory)(const void *mem, size_t length);
-
-  LTOModule *(*module_create_from_memory_with_path)(const void *mem,
-                                                   size_t length,
-                                                   const char *path);
-
-  LTOModule *(*module_create_in_local_context)(const void *mem, size_t length,
-                                              const char *path);
-
-  LTOModule *(*module_create_in_codegen_context)(const void *mem, size_t length,
-                                                const char *path,
-                                                LTOCodeGen *cg);
-
-  LTOModule *(*module_create_from_fd)(int fd, const char *path,
-                                     size_t file_size);
-
-  LTOModule *(*module_create_from_fd_at_offset)(int fd, const char *path,
-                                               size_t file_size,
-                                               size_t map_size, uint64_t offset);
-
-  void (*module_dispose)(LTOModule *mod);
-
-  const char *(*module_get_target_triple)(LTOModule *mod);
-
-  void (*module_set_target_triple)(LTOModule *mod, const char *triple);
-
-  unsigned (*module_get_num_symbols)(LTOModule *mod);
-
-  const char *(*module_get_symbol_name)(LTOModule *mod, unsigned index);
-
-  uint32_t (*module_get_symbol_attribute)(LTOModule *mod, unsigned index);
-
-  const char *(*module_get_linkeropts)(LTOModule *mod);
-
-  bool (*module_get_macho_cputype)(LTOModule *mod, unsigned *out_cputype,
-                                   unsigned *out_cpusubtype);
-
-  bool (*module_has_ctor_dtor)(LTOModule *mod);
-
-  void (*codegen_set_diagnostic_handler)(LTOCodeGen *cg, LTODiagnosticHandler,
-                                         void *);
-
-  LTOCodeGen *(*codegen_create)();
-
-  LTOCodeGen *(*codegen_create_in_local_context)();
-
-  void (*codegen_dispose)(LTOCodeGen *cg);
-
-  bool (*codegen_add_module)(LTOCodeGen *cg, LTOModule *mod);
-
-  void (*codegen_set_module)(LTOCodeGen *cg, LTOModule *mod);
-
-  bool (*codegen_set_debug_model)(LTOCodeGen *cg, LTODebugModel);
-
-  bool (*codegen_set_pic_model)(LTOCodeGen *cg, LTOCodegenModel);
-
-  void (*codegen_set_cpu)(LTOCodeGen *cg, const char *cpu);
-
-  void (*codegen_set_assembler_path)(LTOCodeGen *cg, const char *path);
-
-  void (*codegen_set_assembler_args)(LTOCodeGen *cg, const char **args,
-                                     int nargs);
-
-  void (*codegen_add_must_preserve_symbol)(LTOCodeGen *cg, const char *symbol);
-
-  bool (*codegen_write_merged_modules)(LTOCodeGen *cg, const char *path);
-
-  const void *(*codegen_compile)(LTOCodeGen *cg, size_t *length);
-
-  bool (*codegen_compile_to_file)(LTOCodeGen *cg, const char **name);
-
-  bool (*codegen_optimize)(LTOCodeGen *cg);
-
-  const void *(*codegen_compile_optimized)(LTOCodeGen *cg, size_t *length);
-
-  unsigned (*api_version)();
-
-  void (*set_debug_options)(const char *const *options, int number);
-
-  void (*codegen_debug_options)(LTOCodeGen *cg, const char *);
-
-  void (*codegen_debug_options_array)(LTOCodeGen *cg, const char *const *,
-                                      int number);
-
-  void (*initialize_disassembler)();
-
-  void (*codegen_set_should_internalize)(LTOCodeGen *cg,
-                                         bool should_internalize);
-
-  void (*codegen_set_should_embed_uselists)(LTOCodeGen *cg,
-                                            bool should_embed_use_lists);
-};
-
-} // namespace mold::macho

macho/macho.h

@@ -1,781 +0,0 @@
-#pragma once
-
-#include "../inttypes.h"
-
-#include <cassert>
-#include <cstdint>
-#include <cstring>
-#include <string>
-#include <string_view>
-
-namespace mold::macho {
-
-typedef uint8_t u8;
-typedef uint16_t u16;
-typedef uint32_t u32;
-typedef uint64_t u64;
-
-typedef int8_t i8;
-typedef int16_t i16;
-typedef int32_t i32;
-typedef int64_t i64;
-
-struct ARM64;
-struct X86_64;
-
-template <typename E>
-std::string rel_to_string(u8 r_type);
-
-static constexpr u32 FAT_MAGIC = 0xcafebabe;
-
-static constexpr u32 MH_OBJECT = 0x1;
-static constexpr u32 MH_EXECUTE = 0x2;
-static constexpr u32 MH_FVMLIB = 0x3;
-static constexpr u32 MH_CORE = 0x4;
-static constexpr u32 MH_PRELOAD = 0x5;
-static constexpr u32 MH_DYLIB = 0x6;
-static constexpr u32 MH_DYLINKER = 0x7;
-static constexpr u32 MH_BUNDLE = 0x8;
-static constexpr u32 MH_DYLIB_STUB = 0x9;
-static constexpr u32 MH_DSYM = 0xa;
-static constexpr u32 MH_KEXT_BUNDLE = 0xb;
-
-static constexpr u32 MH_NOUNDEFS = 0x1;
-static constexpr u32 MH_INCRLINK = 0x2;
-static constexpr u32 MH_DYLDLINK = 0x4;
-static constexpr u32 MH_BINDATLOAD = 0x8;
-static constexpr u32 MH_PREBOUND = 0x10;
-static constexpr u32 MH_SPLIT_SEGS = 0x20;
-static constexpr u32 MH_LAZY_INIT = 0x40;
-static constexpr u32 MH_TWOLEVEL = 0x80;
-static constexpr u32 MH_FORCE_FLAT = 0x100;
-static constexpr u32 MH_NOMULTIDEFS = 0x200;
-static constexpr u32 MH_NOFIXPREBINDING = 0x400;
-static constexpr u32 MH_PREBINDABLE = 0x800;
-static constexpr u32 MH_ALLMODSBOUND = 0x1000;
-static constexpr u32 MH_SUBSECTIONS_VIA_SYMBOLS = 0x2000;
-static constexpr u32 MH_CANONICAL = 0x4000;
-static constexpr u32 MH_WEAK_DEFINES = 0x8000;
-static constexpr u32 MH_BINDS_TO_WEAK = 0x10000;
-static constexpr u32 MH_ALLOW_STACK_EXECUTION = 0x20000;
-static constexpr u32 MH_ROOT_SAFE = 0x40000;
-static constexpr u32 MH_SETUID_SAFE = 0x80000;
-static constexpr u32 MH_NO_REEXPORTED_DYLIBS = 0x100000;
-static constexpr u32 MH_PIE = 0x200000;
-static constexpr u32 MH_DEAD_STRIPPABLE_DYLIB = 0x400000;
-static constexpr u32 MH_HAS_TLV_DESCRIPTORS = 0x800000;
-static constexpr u32 MH_NO_HEAP_EXECUTION = 0x1000000;
-static constexpr u32 MH_APP_EXTENSION_SAFE = 0x02000000;
-static constexpr u32 MH_NLIST_OUTOFSYNC_WITH_DYLDINFO = 0x04000000;
-static constexpr u32 MH_SIM_SUPPORT = 0x08000000;
-
-static constexpr u32 VM_PROT_READ = 0x1;
-static constexpr u32 VM_PROT_WRITE = 0x2;
-static constexpr u32 VM_PROT_EXECUTE = 0x4;
-static constexpr u32 VM_PROT_NO_CHANGE = 0x8;
-static constexpr u32 VM_PROT_COPY = 0x10;
-static constexpr u32 VM_PROT_WANTS_COPY = 0x10;
-
-static constexpr u32 LC_REQ_DYLD = 0x80000000;
-
-static constexpr u32 LC_SEGMENT = 0x1;
-static constexpr u32 LC_SYMTAB = 0x2;
-static constexpr u32 LC_SYMSEG = 0x3;
-static constexpr u32 LC_THREAD = 0x4;
-static constexpr u32 LC_UNIXTHREAD = 0x5;
-static constexpr u32 LC_LOADFVMLIB = 0x6;
-static constexpr u32 LC_IDFVMLIB = 0x7;
-static constexpr u32 LC_IDENT = 0x8;
-static constexpr u32 LC_FVMFILE = 0x9;
-static constexpr u32 LC_PREPAGE = 0xa;
-static constexpr u32 LC_DYSYMTAB = 0xb;
-static constexpr u32 LC_LOAD_DYLIB = 0xc;
-static constexpr u32 LC_ID_DYLIB = 0xd;
-static constexpr u32 LC_LOAD_DYLINKER = 0xe;
-static constexpr u32 LC_ID_DYLINKER = 0xf;
-static constexpr u32 LC_PREBOUND_DYLIB = 0x10;
-static constexpr u32 LC_ROUTINES = 0x11;
-static constexpr u32 LC_SUB_FRAMEWORK = 0x12;
-static constexpr u32 LC_SUB_UMBRELLA = 0x13;
-static constexpr u32 LC_SUB_CLIENT = 0x14;
-static constexpr u32 LC_SUB_LIBRARY = 0x15;
-static constexpr u32 LC_TWOLEVEL_HINTS = 0x16;
-static constexpr u32 LC_PREBIND_CKSUM = 0x17;
-static constexpr u32 LC_LOAD_WEAK_DYLIB = (0x18 | LC_REQ_DYLD);
-static constexpr u32 LC_SEGMENT_64 = 0x19;
-static constexpr u32 LC_ROUTINES_64 = 0x1a;
-static constexpr u32 LC_UUID = 0x1b;
-static constexpr u32 LC_RPATH = (0x1c | LC_REQ_DYLD);
-static constexpr u32 LC_CODE_SIGNATURE = 0x1d;
-static constexpr u32 LC_SEGMENT_SPLIT_INFO = 0x1e;
-static constexpr u32 LC_REEXPORT_DYLIB = (0x1f | LC_REQ_DYLD);
-static constexpr u32 LC_LAZY_LOAD_DYLIB = 0x20;
-static constexpr u32 LC_ENCRYPTION_INFO = 0x21;
-static constexpr u32 LC_DYLD_INFO = 0x22;
-static constexpr u32 LC_DYLD_INFO_ONLY = (0x22 | LC_REQ_DYLD);
-static constexpr u32 LC_LOAD_UPWARD_DYLIB = (0x23 | LC_REQ_DYLD);
-static constexpr u32 LC_VERSION_MIN_MACOSX = 0x24;
-static constexpr u32 LC_VERSION_MIN_IPHONEOS = 0x25;
-static constexpr u32 LC_FUNCTION_STARTS = 0x26;
-static constexpr u32 LC_DYLD_ENVIRONMENT = 0x27;
-static constexpr u32 LC_MAIN = (0x28 | LC_REQ_DYLD);
-static constexpr u32 LC_DATA_IN_CODE = 0x29;
-static constexpr u32 LC_SOURCE_VERSION = 0x2A;
-static constexpr u32 LC_DYLIB_CODE_SIGN_DRS = 0x2B;
-static constexpr u32 LC_ENCRYPTION_INFO_64 = 0x2C;
-static constexpr u32 LC_LINKER_OPTION = 0x2D;
-static constexpr u32 LC_LINKER_OPTIMIZATION_HINT = 0x2E;
-static constexpr u32 LC_VERSION_MIN_TVOS = 0x2F;
-static constexpr u32 LC_VERSION_MIN_WATCHOS = 0x30;
-static constexpr u32 LC_NOTE = 0x31;
-static constexpr u32 LC_BUILD_VERSION = 0x32;
-static constexpr u32 LC_DYLD_EXPORTS_TRIE = (0x33 | LC_REQ_DYLD);
-static constexpr u32 LC_DYLD_CHAINED_FIXUPS = (0x34 | LC_REQ_DYLD);
-
-static constexpr u32 SG_HIGHVM = 0x1;
-static constexpr u32 SG_FVMLIB = 0x2;
-static constexpr u32 SG_NORELOC = 0x4;
-static constexpr u32 SG_PROTECTED_VERSION_1 = 0x8;
-static constexpr u32 SG_READ_ONLY = 0x10;
-
-static constexpr u32 S_REGULAR = 0x0;
-static constexpr u32 S_ZEROFILL = 0x1;
-static constexpr u32 S_CSTRING_LITERALS = 0x2;
-static constexpr u32 S_4BYTE_LITERALS = 0x3;
-static constexpr u32 S_8BYTE_LITERALS = 0x4;
-static constexpr u32 S_LITERAL_POINTERS = 0x5;
-static constexpr u32 S_NON_LAZY_SYMBOL_POINTERS = 0x6;
-static constexpr u32 S_LAZY_SYMBOL_POINTERS = 0x7;
-static constexpr u32 S_SYMBOL_STUBS = 0x8;
-static constexpr u32 S_MOD_INIT_FUNC_POINTERS = 0x9;
-static constexpr u32 S_MOD_TERM_FUNC_POINTERS = 0xa;
-static constexpr u32 S_COALESCED = 0xb;
-static constexpr u32 S_GB_ZEROFILL = 0xc;
-static constexpr u32 S_INTERPOSING = 0xd;
-static constexpr u32 S_16BYTE_LITERALS = 0xe;
-static constexpr u32 S_DTRACE_DOF = 0xf;
-static constexpr u32 S_LAZY_DYLIB_SYMBOL_POINTERS = 0x10;
-static constexpr u32 S_THREAD_LOCAL_REGULAR = 0x11;
-static constexpr u32 S_THREAD_LOCAL_ZEROFILL = 0x12;
-static constexpr u32 S_THREAD_LOCAL_VARIABLES = 0x13;
-static constexpr u32 S_THREAD_LOCAL_VARIABLE_POINTERS = 0x14;
-static constexpr u32 S_THREAD_LOCAL_INIT_FUNCTION_POINTERS = 0x15;
-static constexpr u32 S_INIT_FUNC_OFFSETS = 0x16;
-
-static constexpr u32 S_ATTR_LOC_RELOC = 0x1;
-static constexpr u32 S_ATTR_EXT_RELOC = 0x2;
-static constexpr u32 S_ATTR_SOME_INSTRUCTIONS = 0x4;
-
-static constexpr u32 S_ATTR_DEBUG = 0x20000;
-static constexpr u32 S_ATTR_SELF_MODIFYING_CODE = 0x40000;
-static constexpr u32 S_ATTR_LIVE_SUPPORT = 0x80000;
-static constexpr u32 S_ATTR_NO_DEAD_STRIP = 0x100000;
-static constexpr u32 S_ATTR_STRIP_STATIC_SYMS = 0x200000;
-static constexpr u32 S_ATTR_NO_TOC = 0x400000;
-static constexpr u32 S_ATTR_PURE_INSTRUCTIONS = 0x800000;
-
-static constexpr u32 CPU_TYPE_X86_64 = 0x1000007;
-static constexpr u32 CPU_TYPE_ARM64 = 0x100000c;
-
-static constexpr u32 CPU_SUBTYPE_X86_64_ALL = 3;
-static constexpr u32 CPU_SUBTYPE_ARM64_ALL = 0;
-
-static constexpr u32 REBASE_TYPE_POINTER = 1;
-static constexpr u32 REBASE_TYPE_TEXT_ABSOLUTE32 = 2;
-static constexpr u32 REBASE_TYPE_TEXT_PCREL32 = 3;
-
-static constexpr u32 REBASE_OPCODE_MASK = 0xf0;
-static constexpr u32 REBASE_IMMEDIATE_MASK = 0x0f;
-static constexpr u32 REBASE_OPCODE_DONE = 0x00;
-static constexpr u32 REBASE_OPCODE_SET_TYPE_IMM = 0x10;
-static constexpr u32 REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB = 0x20;
-static constexpr u32 REBASE_OPCODE_ADD_ADDR_ULEB = 0x30;
-static constexpr u32 REBASE_OPCODE_ADD_ADDR_IMM_SCALED = 0x40;
-static constexpr u32 REBASE_OPCODE_DO_REBASE_IMM_TIMES = 0x50;
-static constexpr u32 REBASE_OPCODE_DO_REBASE_ULEB_TIMES = 0x60;
-static constexpr u32 REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB = 0x70;
-static constexpr u32 REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB = 0x80;
-
-static constexpr u32 BIND_TYPE_POINTER = 1;
-static constexpr u32 BIND_TYPE_TEXT_ABSOLUTE32 = 2;
-static constexpr u32 BIND_TYPE_TEXT_PCREL32 = 3;
-
-static constexpr i32 BIND_SPECIAL_DYLIB_SELF = 0;
-static constexpr i32 BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE = -1;
-static constexpr i32 BIND_SPECIAL_DYLIB_FLAT_LOOKUP = -2;
-static constexpr i32 BIND_SPECIAL_DYLIB_WEAK_LOOKUP = -3;
-
-static constexpr u32 BIND_SYMBOL_FLAGS_WEAK_IMPORT = 0x1;
-static constexpr u32 BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION = 0x8;
-
-static constexpr u32 BIND_OPCODE_MASK = 0xF0;
-static constexpr u32 BIND_IMMEDIATE_MASK = 0x0F;
-static constexpr u32 BIND_OPCODE_DONE = 0x00;
-static constexpr u32 BIND_OPCODE_SET_DYLIB_ORDINAL_IMM = 0x10;
-static constexpr u32 BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB = 0x20;
-static constexpr u32 BIND_OPCODE_SET_DYLIB_SPECIAL_IMM = 0x30;
-static constexpr u32 BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM = 0x40;
-static constexpr u32 BIND_OPCODE_SET_TYPE_IMM = 0x50;
-static constexpr u32 BIND_OPCODE_SET_ADDEND_SLEB = 0x60;
-static constexpr u32 BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB = 0x70;
-static constexpr u32 BIND_OPCODE_ADD_ADDR_ULEB = 0x80;
-static constexpr u32 BIND_OPCODE_DO_BIND = 0x90;
-static constexpr u32 BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB = 0xA0;
-static constexpr u32 BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED = 0xB0;
-static constexpr u32 BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB = 0xC0;
-static constexpr u32 BIND_OPCODE_THREADED = 0xD0;
-static constexpr u32 BIND_SUBOPCODE_THREADED_SET_BIND_ORDINAL_TABLE_SIZE_ULEB = 0x00;
-static constexpr u32 BIND_SUBOPCODE_THREADED_APPLY = 0x01;
-
-static constexpr u32 EXPORT_SYMBOL_FLAGS_KIND_MASK = 0x03;
-static constexpr u32 EXPORT_SYMBOL_FLAGS_KIND_REGULAR = 0x00;
-static constexpr u32 EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL = 0x01;
-static constexpr u32 EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE = 0x02;
-static constexpr u32 EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION = 0x04;
-static constexpr u32 EXPORT_SYMBOL_FLAGS_REEXPORT = 0x08;
-static constexpr u32 EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER = 0x10;
-
-static constexpr u32 DICE_KIND_DATA = 1;
-static constexpr u32 DICE_KIND_JUMP_TABLE8 = 2;
-static constexpr u32 DICE_KIND_JUMP_TABLE16 = 3;
-static constexpr u32 DICE_KIND_JUMP_TABLE32 = 4;
-static constexpr u32 DICE_KIND_ABS_JUMP_TABLE32 = 5;
-
-static constexpr u32 N_UNDF = 0;
-static constexpr u32 N_ABS = 1;
-static constexpr u32 N_INDR = 5;
-static constexpr u32 N_PBUD = 6;
-static constexpr u32 N_SECT = 7;
-
-static constexpr u32 N_GSYM = 0x20;
-static constexpr u32 N_FNAME = 0x22;
-static constexpr u32 N_FUN = 0x24;
-static constexpr u32 N_STSYM = 0x26;
-static constexpr u32 N_LCSYM = 0x28;
-static constexpr u32 N_BNSYM = 0x2e;
-static constexpr u32 N_AST = 0x32;
-static constexpr u32 N_OPT = 0x3c;
-static constexpr u32 N_RSYM = 0x40;
-static constexpr u32 N_SLINE = 0x44;
-static constexpr u32 N_ENSYM = 0x4e;
-static constexpr u32 N_SSYM = 0x60;
-static constexpr u32 N_SO = 0x64;
-static constexpr u32 N_OSO = 0x66;
-static constexpr u32 N_LSYM = 0x80;
-static constexpr u32 N_BINCL = 0x82;
-static constexpr u32 N_SOL = 0x84;
-static constexpr u32 N_PARAMS = 0x86;
-static constexpr u32 N_VERSION = 0x88;
-static constexpr u32 N_OLEVEL = 0x8A;
-static constexpr u32 N_PSYM = 0xa0;
-static constexpr u32 N_EINCL = 0xa2;
-static constexpr u32 N_ENTRY = 0xa4;
-static constexpr u32 N_LBRAC = 0xc0;
-static constexpr u32 N_EXCL = 0xc2;
-static constexpr u32 N_RBRAC = 0xe0;
-static constexpr u32 N_BCOMM = 0xe2;
-static constexpr u32 N_ECOMM = 0xe4;
-static constexpr u32 N_ECOML = 0xe8;
-static constexpr u32 N_LENG = 0xfe;
-static constexpr u32 N_PC = 0x30;
-
-static constexpr u32 REFERENCE_TYPE = 0xf;
-static constexpr u32 REFERENCE_FLAG_UNDEFINED_NON_LAZY = 0;
-static constexpr u32 REFERENCE_FLAG_UNDEFINED_LAZY = 1;
-static constexpr u32 REFERENCE_FLAG_DEFINED = 2;
-static constexpr u32 REFERENCE_FLAG_PRIVATE_DEFINED = 3;
-static constexpr u32 REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY = 4;
-static constexpr u32 REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY = 5;
-
-static constexpr u32 REFERENCED_DYNAMICALLY = 0x0010;
-
-static constexpr u32 SELF_LIBRARY_ORDINAL = 0x0;
-static constexpr u32 MAX_LIBRARY_ORDINAL = 0xfd;
-static constexpr u32 DYNAMIC_LOOKUP_ORDINAL = 0xfe;
-static constexpr u32 EXECUTABLE_ORDINAL = 0xff;
-
-static constexpr u32 N_NO_DEAD_STRIP = 0x0020;
-static constexpr u32 N_DESC_DISCARDED = 0x0020;
-static constexpr u32 N_WEAK_REF = 0x0040;
-static constexpr u32 N_WEAK_DEF = 0x0080;
-static constexpr u32 N_REF_TO_WEAK = 0x0080;
-static constexpr u32 N_ARM_THUMB_DEF = 0x0008;
-static constexpr u32 N_SYMBOL_RESOLVER = 0x0100;
-static constexpr u32 N_ALT_ENTRY = 0x0200;
-
-static constexpr u32 PLATFORM_MACOS = 1;
-static constexpr u32 PLATFORM_IOS = 2;
-static constexpr u32 PLATFORM_TVOS = 3;
-static constexpr u32 PLATFORM_WATCHOS = 4;
-static constexpr u32 PLATFORM_BRIDGEOS = 5;
-static constexpr u32 PLATFORM_MACCATALYST = 6;
-static constexpr u32 PLATFORM_IOSSIMULATOR = 7;
-static constexpr u32 PLATFORM_TVOSSIMULATOR = 8;
-static constexpr u32 PLATFORM_WATCHOSSIMULATOR = 9;
-static constexpr u32 PLATFORM_DRIVERKIT = 10;
-
-static constexpr u32 TOOL_CLANG = 1;
-static constexpr u32 TOOL_SWIFT = 2;
-static constexpr u32 TOOL_LD = 3;
-static constexpr u32 TOOL_MOLD = 54321; // Randomly chosen!
-
-static constexpr u32 OBJC_IMAGE_SUPPORTS_GC = 1 << 1;
-static constexpr u32 OBJC_IMAGE_REQUIRES_GC = 1 << 2;
-static constexpr u32 OBJC_IMAGE_OPTIMIZED_BY_DYLD = 1 << 3;
-static constexpr u32 OBJC_IMAGE_SUPPORTS_COMPACTION = 1 << 4;
-static constexpr u32 OBJC_IMAGE_IS_SIMULATED = 1 << 5;
-static constexpr u32 OBJC_IMAGE_HAS_CATEGORY_CLASS_PROPERTIES = 1 << 6;
-
-static constexpr u32 LOH_ARM64_ADRP_ADRP = 1;
-static constexpr u32 LOH_ARM64_ADRP_LDR = 2;
-static constexpr u32 LOH_ARM64_ADRP_ADD_LDR = 3;
-static constexpr u32 LOH_ARM64_ADRP_LDR_GOT_LDR = 4;
-static constexpr u32 LOH_ARM64_ADRP_ADD_STR = 5;
-static constexpr u32 LOH_ARM64_ADRP_LDR_GOT_STR = 6;
-static constexpr u32 LOH_ARM64_ADRP_ADD = 7;
-static constexpr u32 LOH_ARM64_ADRP_LDR_GOT = 8;
-
-static constexpr u32 ARM64_RELOC_UNSIGNED = 0;
-static constexpr u32 ARM64_RELOC_SUBTRACTOR = 1;
-static constexpr u32 ARM64_RELOC_BRANCH26 = 2;
-static constexpr u32 ARM64_RELOC_PAGE21 = 3;
-static constexpr u32 ARM64_RELOC_PAGEOFF12 = 4;
-static constexpr u32 ARM64_RELOC_GOT_LOAD_PAGE21 = 5;
-static constexpr u32 ARM64_RELOC_GOT_LOAD_PAGEOFF12 = 6;
-static constexpr u32 ARM64_RELOC_POINTER_TO_GOT = 7;
-static constexpr u32 ARM64_RELOC_TLVP_LOAD_PAGE21 = 8;
-static constexpr u32 ARM64_RELOC_TLVP_LOAD_PAGEOFF12 = 9;
-static constexpr u32 ARM64_RELOC_ADDEND = 10;
-
-template <>
-inline std::string rel_to_string<ARM64>(u8 type) {
-  switch (type) {
-  case ARM64_RELOC_UNSIGNED: return "ARM64_RELOC_UNSIGNED";
-  case ARM64_RELOC_SUBTRACTOR: return "ARM64_RELOC_SUBTRACTOR";
-  case ARM64_RELOC_BRANCH26: return "ARM64_RELOC_BRANCH26";
-  case ARM64_RELOC_PAGE21: return "ARM64_RELOC_PAGE21";
-  case ARM64_RELOC_PAGEOFF12: return "ARM64_RELOC_PAGEOFF12";
-  case ARM64_RELOC_GOT_LOAD_PAGE21: return "ARM64_RELOC_GOT_LOAD_PAGE21";
-  case ARM64_RELOC_GOT_LOAD_PAGEOFF12: return "ARM64_RELOC_GOT_LOAD_PAGEOFF12";
-  case ARM64_RELOC_POINTER_TO_GOT: return "ARM64_RELOC_POINTER_TO_GOT";
-  case ARM64_RELOC_TLVP_LOAD_PAGE21: return "ARM64_RELOC_TLVP_LOAD_PAGE21";
-  case ARM64_RELOC_TLVP_LOAD_PAGEOFF12: return "ARM64_RELOC_TLVP_LOAD_PAGEOFF12";
-  case ARM64_RELOC_ADDEND: return "ARM64_RELOC_ADDEND";
-  }
-  return "unknown (" + std::to_string(type) + ")";
-}
-
-static constexpr u32 X86_64_RELOC_UNSIGNED = 0;
-static constexpr u32 X86_64_RELOC_SIGNED = 1;
-static constexpr u32 X86_64_RELOC_BRANCH = 2;
-static constexpr u32 X86_64_RELOC_GOT_LOAD = 3;
-static constexpr u32 X86_64_RELOC_GOT = 4;
-static constexpr u32 X86_64_RELOC_SUBTRACTOR = 5;
-static constexpr u32 X86_64_RELOC_SIGNED_1 = 6;
-static constexpr u32 X86_64_RELOC_SIGNED_2 = 7;
-static constexpr u32 X86_64_RELOC_SIGNED_4 = 8;
-static constexpr u32 X86_64_RELOC_TLV = 9;
-
-template <>
-inline std::string rel_to_string<X86_64>(u8 type) {
-  switch (type) {
-  case X86_64_RELOC_UNSIGNED: return "X86_64_RELOC_UNSIGNED";
-  case X86_64_RELOC_SIGNED: return "X86_64_RELOC_SIGNED";
-  case X86_64_RELOC_BRANCH: return "X86_64_RELOC_BRANCH";
-  case X86_64_RELOC_GOT_LOAD: return "X86_64_RELOC_GOT_LOAD";
-  case X86_64_RELOC_GOT: return "X86_64_RELOC_GOT";
-  case X86_64_RELOC_SUBTRACTOR: return "X86_64_RELOC_SUBTRACTOR";
-  case X86_64_RELOC_SIGNED_1: return "X86_64_RELOC_SIGNED_1";
-  case X86_64_RELOC_SIGNED_2: return "X86_64_RELOC_SIGNED_2";
-  case X86_64_RELOC_SIGNED_4: return "X86_64_RELOC_SIGNED_4";
-  case X86_64_RELOC_TLV: return "X86_64_RELOC_TLV";
-  }
-  return "unknown (" + std::to_string(type) + ")";
-}
-
-struct FatHeader {
-  ub32 magic;
-  ub32 nfat_arch;
-};
-
-struct FatArch {
-  ub32 cputype;
-  ub32 cpusubtype;
-  ub32 offset;
-  ub32 size;
-  ub32 align;
-};
-
-struct MachHeader {
-  ul32 magic;
-  ul32 cputype;
-  ul32 cpusubtype;
-  ul32 filetype;
-  ul32 ncmds;
-  ul32 sizeofcmds;
-  ul32 flags;
-  ul32 reserved;
-};
-
-struct LoadCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-};
-
-struct SegmentCommand {
-  std::string_view get_segname() const {
-    return {segname, strnlen(segname, sizeof(segname))};
-  }
-
-  ul32 cmd;
-  ul32 cmdsize;
-  char segname[16];
-  ul64 vmaddr;
-  ul64 vmsize;
-  ul64 fileoff;
-  ul64 filesize;
-  ul32 maxprot;
-  ul32 initprot;
-  ul32 nsects;
-  ul32 flags;
-};
-
-struct MachSection {
-  void set_segname(std::string_view name) {
-    assert(name.size() <= sizeof(segname));
-    memcpy(segname, name.data(), name.size());
-  }
-
-  std::string_view get_segname() const {
-    return {segname, strnlen(segname, sizeof(segname))};
-  }
-
-  void set_sectname(std::string_view name) {
-    assert(name.size() <= sizeof(sectname));
-    memcpy(sectname, name.data(), name.size());
-  }
-
-  std::string_view get_sectname() const {
-    return {sectname, strnlen(sectname, sizeof(sectname))};
-  }
-
-  bool match(std::string_view segname, std::string_view sectname) const {
-    return get_segname() == segname && get_sectname() == sectname;
-  }
-
-  char sectname[16];
-  char segname[16];
-  ul64 addr;
-  ul64 size;
-  ul32 offset;
-  ul32 p2align;
-  ul32 reloff;
-  ul32 nreloc;
-  u8 type;
-  ul24 attr;
-  ul32 reserved1;
-  ul32 reserved2;
-  ul32 reserved3;
-};
-
-struct DylibCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 nameoff;
-  ul32 timestamp;
-  ul32 current_version;
-  ul32 compatibility_version;
-};
-
-struct DylinkerCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 nameoff;
-};
-
-struct SymtabCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 symoff;
-  ul32 nsyms;
-  ul32 stroff;
-  ul32 strsize;
-};
-
-struct DysymtabCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 ilocalsym;
-  ul32 nlocalsym;
-  ul32 iextdefsym;
-  ul32 nextdefsym;
-  ul32 iundefsym;
-  ul32 nundefsym;
-  ul32 tocoff;
-  ul32 ntoc;
-  ul32 modtaboff;
-  ul32 nmodtab;
-  ul32 extrefsymoff;
-  ul32 nextrefsyms;
-  ul32 indirectsymoff;
-  ul32 nindirectsyms;
-  ul32 extreloff;
-  ul32 nextrel;
-  ul32 locreloff;
-  ul32 nlocrel;
-};
-
-struct VersionMinCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 version;
-  ul32 sdk;
-};
-
-struct DyldInfoCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 rebase_off;
-  ul32 rebase_size;
-  ul32 bind_off;
-  ul32 bind_size;
-  ul32 weak_bind_off;
-  ul32 weak_bind_size;
-  ul32 lazy_bind_off;
-  ul32 lazy_bind_size;
-  ul32 export_off;
-  ul32 export_size;
-};
-
-struct UUIDCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  u8 uuid[16];
-};
-
-struct RpathCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 path_off;
-};
-
-struct LinkEditDataCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 dataoff;
-  ul32 datasize;
-};
-
-struct BuildToolVersion {
-  ul32 tool;
-  ul32 version;
-};
-
-struct BuildVersionCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 platform;
-  ul32 minos;
-  ul32 sdk;
-  ul32 ntools;
-};
-
-struct EntryPointCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul64 entryoff;
-  ul64 stacksize;
-};
-
-struct SourceVersionCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul64 version;
-};
-
-struct DataInCodeEntry {
-  ul32 offset;
-  ul16 length;
-  ul16 kind;
-};
-
-struct LinkerOptionCommand {
-  ul32 cmd;
-  ul32 cmdsize;
-  ul32 count;
-};
-
-// This struct is named `n_list` on BSD and macOS.
-struct MachSym {
-  bool is_undef() const {
-    return type == N_UNDF && !is_common();
-  }
-
-  bool is_common() const {
-    return type == N_UNDF && is_extern && value;
-  }
-
-  ul32 stroff;
-
-  union {
-    u8 n_type;
-    struct {
-      u8 is_extern : 1;
-      u8 type : 3;
-      u8 is_private_extern : 1;
-      u8 stab : 3;
-    };
-  };
-
-  u8 sect;
-
-  union {
-    ul16 desc;
-    struct {
-      u8 padding;
-      u8 common_p2align : 4;
-    };
-  };
-
-  ul64 value;
-};
-
-// This struct is named `relocation_info` on BSD and macOS.
-struct MachRel {
-  ul32 offset;
-  ul24 idx;
-  u8 is_pcrel : 1;
-  u8 p2size : 2;
-  u8 is_extern : 1;
-  u8 type : 4;
-};
-
-// __TEXT,__unwind_info section contents
-
-static constexpr u32 UNWIND_SECTION_VERSION = 1;
-static constexpr u32 UNWIND_SECOND_LEVEL_REGULAR = 2;
-static constexpr u32 UNWIND_SECOND_LEVEL_COMPRESSED = 3;
-static constexpr u32 UNWIND_PERSONALITY_MASK = 0x30000000;
-
-struct UnwindSectionHeader {
-  ul32 version;
-  ul32 encoding_offset;
-  ul32 encoding_count;
-  ul32 personality_offset;
-  ul32 personality_count;
-  ul32 page_offset;
-  ul32 page_count;
-};
-
-struct UnwindFirstLevelPage {
-  ul32 func_addr;
-  ul32 page_offset;
-  ul32 lsda_offset;
-};
-
-struct UnwindSecondLevelPage {
-  ul32 kind;
-  ul16 page_offset;
-  ul16 page_count;
-  ul16 encoding_offset;
-  ul16 encoding_count;
-};
-
-struct UnwindLsdaEntry {
-  ul32 func_addr;
-  ul32 lsda_addr;
-};
-
-struct UnwindPageEntry {
-  ul24 func_addr;
-  u8 encoding;
-};
-
-// __LD,__compact_unwind section contents
-
-struct CompactUnwindEntry {
-  ul64 code_start;
-  ul32 code_len;
-  ul32 encoding;
-  ul64 personality;
-  ul64 lsda;
-};
-
-// __LINKEDIT,__code_signature
-
-static constexpr u32 CSMAGIC_EMBEDDED_SIGNATURE = 0xfade0cc0;
-static constexpr u32 CS_SUPPORTSEXECSEG = 0x20400;
-static constexpr u32 CSMAGIC_CODEDIRECTORY = 0xfade0c02;
-static constexpr u32 CSSLOT_CODEDIRECTORY = 0;
-static constexpr u32 CS_ADHOC = 0x00000002;
-static constexpr u32 CS_LINKER_SIGNED = 0x00020000;
-static constexpr u32 CS_EXECSEG_MAIN_BINARY = 1;
-static constexpr u32 CS_HASHTYPE_SHA256 = 2;
-
-struct CodeSignatureHeader {
-  ub32 magic;
-  ub32 length;
-  ub32 count;
-};
-
-struct CodeSignatureBlobIndex {
-  ub32 type;
-  ub32 offset;
-  ub32 padding;
-};
-
-struct CodeSignatureDirectory {
-  ub32 magic;
-  ub32 length;
-  ub32 version;
-  ub32 flags;
-  ub32 hash_offset;
-  ub32 ident_offset;
-  ub32 n_special_slots;
-  ub32 n_code_slots;
-  ub32 code_limit;
-  u8 hash_size;
-  u8 hash_type;
-  u8 platform;
-  u8 page_size;
-  ub32 spare2;
-  ub32 scatter_offset;
-  ub32 team_offset;
-  ub32 spare3;
-  ub64 code_limit64;
-  ub64 exec_seg_base;
-  ub64 exec_seg_limit;
-  ub64 exec_seg_flags;
-};
-
-// __DATA,__objc_imageinfo
-struct ObjcImageInfo {
-  ul32 version = 0;
-  u8 flags = 0;
-  u8 swift_version = 0;
-  ul16 swift_lang_version = 0;
-};
-
-struct ARM64 {
-  static constexpr u32 cputype = CPU_TYPE_ARM64;
-  static constexpr u32 cpusubtype = CPU_SUBTYPE_ARM64_ALL;
-  static constexpr u32 page_size = 16384;
-  static constexpr u32 abs_rel = ARM64_RELOC_UNSIGNED;
-  static constexpr u32 word_size = 8;
-  static constexpr u32 stub_size = 12;
-  static constexpr u32 stub_helper_hdr_size = 24;
-  static constexpr u32 stub_helper_size = 12;
-};
-
-struct X86_64 {
-  static constexpr u32 cputype = CPU_TYPE_X86_64;
-  static constexpr u32 cpusubtype = CPU_SUBTYPE_X86_64_ALL;
-  static constexpr u32 page_size = 4096;
-  static constexpr u32 abs_rel = X86_64_RELOC_UNSIGNED;
-  static constexpr u32 word_size = 8;
-  static constexpr u32 stub_size = 6;
-  static constexpr u32 stub_helper_hdr_size = 16;
-  static constexpr u32 stub_helper_size = 10;
-};
-
-} // namespace mold::macho

macho/mapfile.cc

@@ -1,80 +0,0 @@
-#include "mold.h"
-
-#include <iomanip>
-#include <fstream>
-
-namespace mold::macho {
-
-struct Sym {
-  u64 addr;
-  u32 size;
-  u32 fileidx;
-  std::string_view name;
-};
-
-template <typename E>
-void print_map(Context<E> &ctx) {
-  std::ofstream out(ctx.arg.map.c_str());
-  if (!out.is_open())
-    Fatal(ctx) << "cannot open " << ctx.arg.map << ": " << errno_string();
-
-  out << "# Path: " << ctx.arg.output << "\n"
-      << "# Arch: x86-64\n"
-      << "# Object files:\n";
-
-  std::vector<Sym> syms;
-
-  for (i64 i = 0; i < ctx.objs.size(); i++){
-    ObjectFile<E> &file = *ctx.objs[i];
-
-    if (file.is_alive) {
-      out << "[" << std::setw(3) << i << "] " << file << "\n";
-      for (Symbol<E> *sym : file.syms)
-        if (sym && sym->file == &file)
-          if (!sym->subsec || sym->subsec->is_alive)
-            syms.push_back({sym->get_addr(ctx), 0, (u32)i, sym->name});
-    }
-  }
-
-  sort(syms, [](const Sym &a, const Sym &b) {
-    return a.addr < b.addr;
-  });
-
-  out << "# Sections:\n"
-      << "# Address       Size            Segment Section\n";
-
-  for (std::unique_ptr<OutputSegment<E>> &seg : ctx.segments) {
-    for (Chunk<E> *chunk : seg->chunks) {
-      if (!chunk->is_hidden) {
-        out << "0x" << std::hex
-            << std::setw(8) << std::setfill('0') << chunk->hdr.addr
-            << "     0x"
-            << std::setw(8) << std::setfill('0') << chunk->hdr.size
-            << "      " << std::setw(7) << std::left << std::setfill(' ')
-            << chunk->hdr.get_segname()
-            << " " << chunk->hdr.get_sectname() << "\n";
-      }
-    }
-  }
-
-  out << "# Symbols:\n"
-      << "# Address       Size            File  Name\n";
-
-  for (Sym &sym : syms) {
-    out << "0x" << std::hex
-        << std::setw(8) << std::setfill('0') << sym.addr
-        << "     0x"
-        << std::setw(8) << std::setfill('0') << 0
-        << "      ["
-        << std::setw(3) << std::right << std::setfill(' ') << std::dec
-        << sym.fileidx
-        << "] " << sym.name << "\n";
-  }
-}
-
-#define INSTANTIATE(E)                          \
-  template void print_map(Context<E> &)
-
-INSTANTIATE_ALL;
-
-} // namespace mold::macho

macho/tapi.cc

@@ -1,294 +0,0 @@
-// On macOS, you can pass a test file describing a dylib instead of an
-// actual dylib file to link against a dynamic library. Such text file
-// should be in the YAML format and contains dylib's exported symbols
-// as well as the file's various attributes. The extension of the text
-// file is `.tbd`.
-//
-// .tbd files allows users to link against a library without
-// distributing the binary of the library file itself.
-//
-// This file contains functions to parse the .tbd file.
-
-#include "mold.h"
-
-#include <optional>
-#include <regex>
-#include <unordered_set>
-
-namespace mold::macho {
-
-template <typename T, typename U>
-static void merge(std::set<T> &a, U &&b) {
-  a.insert(b.begin(), b.end());
-}
-
-static std::vector<YamlNode>
-get_vector(YamlNode &node, std::string_view key) {
-  if (auto *map = std::get_if<std::map<std::string_view, YamlNode>>(&node.data))
-    if (auto it = map->find(key); it != map->end())
-      if (auto *vec = std::get_if<std::vector<YamlNode>>(&it->second.data))
-        return *vec;
-  return {};
-}
-
-static std::vector<std::string_view>
-get_string_vector(YamlNode &node, std::string_view key) {
-  std::vector<std::string_view> vec;
-  for (YamlNode &mem : get_vector(node, key))
-    if (auto val = std::get_if<std::string_view>(&mem.data))
-      vec.push_back(*val);
-  return vec;
-}
-
-static std::optional<std::string_view>
-get_string(YamlNode &node, std::string_view key) {
-  if (auto *map = std::get_if<std::map<std::string_view, YamlNode>>(&node.data))
-    if (auto it = map->find(key); it != map->end())
-      if (auto *str = std::get_if<std::string_view>(&it->second.data))
-        return *str;
-  return {};
-}
-
-static bool contains(const std::vector<YamlNode> &vec, std::string_view key) {
-  for (const YamlNode &mem : vec)
-    if (auto val = std::get_if<std::string_view>(&mem.data))
-      if (*val == key)
-        return true;
-  return false;
-}
-
-static bool match_arch(const std::vector<YamlNode> &vec, std::string_view arch) {
-  for (const YamlNode &mem : vec)
-    if (auto val = std::get_if<std::string_view>(&mem.data))
-      if (*val == arch || val->starts_with(std::string(arch) + "-"))
-        return true;
-  return false;
-}
-
-template <typename E>
-static std::optional<TextDylib>
-to_tbd(Context<E> &ctx, YamlNode &node, std::string_view arch,
-       std::string_view filename) {
-  if (!match_arch(get_vector(node, "targets"), arch))
-    return {};
-
-  if (ctx.arg.application_extension &&
-      contains(get_vector(node, "flags"), "not_app_extension_safe"))
-    Warn(ctx) << "linking against a dylib which is not safe for use in "
-              << "application extensions: " << filename;
-
-  TextDylib tbd;
-
-  if (auto val = get_string(node, "install-name"))
-    tbd.install_name = *val;
-
-  for (YamlNode &mem : get_vector(node, "reexported-libraries"))
-    if (match_arch(get_vector(mem, "targets"), arch))
-      append(tbd.reexported_libs, get_string_vector(mem, "libraries"));
-
-  auto concat = [&](const std::string &x, std::string_view y) {
-    return save_string(ctx, x + std::string(y));
-  };
-
-  for (std::string_view key : {"exports", "reexports"}) {
-    for (YamlNode &mem : get_vector(node, key)) {
-      if (match_arch(get_vector(mem, "targets"), arch)) {
-        merge(tbd.exports, get_string_vector(mem, "symbols"));
-        merge(tbd.weak_exports, get_string_vector(mem, "weak-symbols"));
-
-        for (std::string_view s : get_string_vector(mem, "objc-classes")) {
-          tbd.exports.insert(concat("_OBJC_CLASS_$_", s));
-          tbd.exports.insert(concat("_OBJC_METACLASS_$_", s));
-        }
-
-        for (std::string_view s : get_string_vector(mem, "objc-eh-types"))
-          tbd.exports.insert(concat("_OBJC_EHTYPE_$_", s));
-
-        for (std::string_view s : get_string_vector(mem, "objc-ivars"))
-          tbd.exports.insert(concat("_OBJC_IVAR_$_", s));
-      }
-    }
-  }
-
-  return tbd;
-}
-
-static i64 parse_version(const std::string &arg) {
-  auto flags = std::regex_constants::ECMAScript | std::regex_constants::optimize;
-  static std::regex re(R"((\d+)(?:\.(\d+))?(?:\.(\d+))?)", flags);
-
-  std::smatch m;
-  bool ok = std::regex_match(arg, m, re);
-  assert(ok);
-
-  i64 major = (m[1].length() == 0) ? 0 : stoi(m[1]);
-  i64 minor = (m[2].length() == 0) ? 0 : stoi(m[2]);
-  i64 patch = (m[3].length() == 0) ? 0 : stoi(m[3]);
-  return (major << 16) | (minor << 8) | patch;
-}
-
-// Dylib can contain special symbols whose name starts with "$ld$".
-// Such symbols aren't actually symbols but linker directives.
-// We interpret such symbols in this function.
-template <typename E>
-static void interpret_ld_symbols(Context<E> &ctx, TextDylib &tbd) {
-  std::set<std::string_view> syms;
-  std::unordered_set<std::string_view> hidden_syms;
-
-  auto string_view = [](const std::csub_match &sub) {
-    return std::string_view{sub.first, (size_t)sub.length()};
-  };
-
-  for (std::string_view s : tbd.exports) {
-    if (!s.starts_with("$ld$"))
-      continue;
-
-    auto flags = std::regex_constants::ECMAScript | std::regex_constants::optimize;
-    std::cmatch m;
-
-    // $ld$previous$ symbol replaces the default install name with a
-    // specified one if the platform OS version is in a specified range.
-    static std::regex previous_re(
-      R"(\$ld\$previous\$([^$]+)\$([\d.]*)\$(\d+)\$([\d.]+)\$([\d.]+)\$(.*)\$)",
-      flags);
-
-    if (std::regex_match(s.data(), s.data() + s.size(), m, previous_re)) {
-      std::string_view install_name = string_view(m[1]);
-      i64 platform = std::stoi(m[3].str());
-      i64 min_version = parse_version(m[4]);
-      i64 max_version = parse_version(m[5]);
-      std::string_view symbol_name = string_view(m[6]);
-
-      if (!symbol_name.empty()) {
-        // ld64 source seems to have implemented a feature to give an
-        // alternative install name for a matching symbol, but it didn't
-        // work in practice (or I may be using the feature in a wrong way.)
-        // Ignore such symbol for now.
-        continue;
-      }
-
-      if (platform == ctx.arg.platform &&
-          min_version <= ctx.arg.platform_min_version &&
-          ctx.arg.platform_min_version < max_version) {
-        tbd.install_name = install_name;
-      }
-      continue;
-    }
-
-    // $ld$add$os_version$symbol adds a symbol if the given OS version
-    // matches.
-    static std::regex add_re(R"(\$ld\$add\$os([\d.]+)\$(.+))", flags);
-
-    if (std::regex_match(s.data(), s.data() + s.size(), m, add_re)) {
-      if (ctx.arg.platform_min_version == parse_version(m[1]))
-        syms.insert(string_view(m[2]));
-      continue;
-    }
-
-    // $ld$hide$os_version$symbol hides a symbol if the given OS version
-    // matches.
-    static std::regex hidden_re(R"(\$ld\$hide\$os([\d.]+)\$(.+))", flags);
-
-    if (std::regex_match(s.data(), s.data() + s.size(), m, hidden_re)) {
-      if (ctx.arg.platform_min_version == parse_version(m[1]))
-        hidden_syms.insert(string_view(m[2]));
-      continue;
-    }
-
-    // $ld$install_name$os_version$name changes the install name to a
-    // given name.
-    static std::regex
-      install_name_re(R"(\$ld\$install_name\$os([\d.]+)\$(.+))", flags);
-
-    if (std::regex_match(s.data(), s.data() + s.size(), m, install_name_re)) {
-      if (ctx.arg.platform_min_version == parse_version(m[1]))
-        tbd.install_name = string_view(m[2]);
-      continue;
-    }
-  }
-
-  for (std::string_view s : tbd.exports)
-    if (!s.starts_with("$ld$") && !hidden_syms.contains(s))
-      syms.insert(s);
-
-  tbd.exports = std::move(syms);
-}
-
-template <typename E>
-static TextDylib parse(Context<E> &ctx, MappedFile<Context<E>> *mf,
-                       std::string_view arch);
-
-// A single YAML file may contain multiple text dylibs. The first text
-// dylib is the main file followed by optional other text dylibs for
-// re-exported libraries.
-//
-// This fucntion squashes multiple text dylibs into a single text dylib
-// by copying symbols of re-exported text dylibs to the main text dylib.
-template <typename E>
-static TextDylib
-squash(Context<E> &ctx, std::span<TextDylib> tbds, std::string_view arch) {
-  std::unordered_map<std::string_view, TextDylib> map;
-  std::vector<std::string_view> remainings;
-
-  TextDylib main = std::move(tbds[0]);
-  for (TextDylib &tbd : tbds.subspan(1))
-    map[tbd.install_name] = std::move(tbd);
-
-  std::function<void(TextDylib &)> visit = [&](TextDylib &tbd) {
-    for (std::string_view lib : tbd.reexported_libs) {
-      auto it = map.find(lib);
-
-      if (it != map.end()) {
-        TextDylib &child = it->second;
-        merge(main.exports, child.exports);
-        merge(main.weak_exports, child.weak_exports);
-        visit(child);
-      } else {
-        remainings.push_back(lib);
-      }
-    }
-  };
-
-  visit(main);
-  main.reexported_libs = remainings;
-  return main;
-}
-
-template <typename E>
-static TextDylib parse(Context<E> &ctx, MappedFile<Context<E>> *mf,
-                       std::string_view arch) {
-  std::string_view contents = mf->get_contents();
-  std::variant<std::vector<YamlNode>, YamlError> res = parse_yaml(contents);
-
-  if (YamlError *err = std::get_if<YamlError>(&res)) {
-    i64 lineno = std::count(contents.begin(), contents.begin() + err->pos, '\n');
-    Fatal(ctx) << mf->name << ":" << (lineno + 1)
-               << ": YAML parse error: " << err->msg;
-  }
-
-  std::vector<YamlNode> &nodes = std::get<std::vector<YamlNode>>(res);
-  if (nodes.empty())
-    Fatal(ctx) << mf->name << ": malformed TBD file";
-
-  std::vector<TextDylib> vec;
-  for (YamlNode &node : nodes)
-    if (std::optional<TextDylib> dylib = to_tbd(ctx, node, arch, mf->name))
-      vec.push_back(*dylib);
-
-  for (TextDylib &tbd : vec)
-    interpret_ld_symbols(ctx, tbd);
-
-  return squash(ctx, vec, arch);
-}
-
-template <>
-TextDylib parse_tbd(Context<ARM64> &ctx, MappedFile<Context<ARM64>> *mf) {
-  return parse(ctx, mf, "arm64");
-}
-
-template <>
-TextDylib parse_tbd(Context<X86_64> &ctx, MappedFile<Context<X86_64>> *mf) {
-  return parse(ctx, mf, "x86_64");
-}
-
-} // namespace mold::macho

macho/yaml.cc

@@ -1,378 +0,0 @@
-// On macOS, a .tbd file can be used instead of a .dylib to link
-// against a dynamic library. A .tbd file is a text file in the YAML
-// format, so the linker has to be able to parse a YAML file. This
-// file implements a YAML parser.
-//
-// We implemented a YAML parser ourselves instead of using an external
-// library. We didn't want to add an dependency to an external library
-// just to read .tdb files.
-//
-// YAML as a format is very complicated. For example, the official
-// YAML specification allows embedding a JSON string into YAML; so it
-// is strictly larger than JSON. It has surprisingly many features
-// that most users are not aware of. Fortunately, we have to support
-// only a small portion of the spec to read a .tbd file.
-
-#include "mold.h"
-
-#include <optional>
-
-namespace mold::macho {
-
-enum { STRING = 1, INDENT, DEDENT, END };
-
-struct Token {
-  u8 kind = 0;
-  std::string_view str;
-};
-
-class YamlParser {
-public:
-  YamlParser(std::string_view input) : input(input) {}
-
-  std::variant<std::vector<YamlNode>, YamlError> parse();
-
-private:
-  std::optional<YamlError> tokenize();
-
-  void tokenize_bare_string(std::string_view &str);
-
-  std::optional<YamlError> tokenize_list(std::string_view &str);
-  std::optional<YamlError> tokenize_string(std::string_view &str, char end);
-
-  std::variant<YamlNode, YamlError> parse_element(std::span<Token> &tok);
-  std::variant<YamlNode, YamlError> parse_list(std::span<Token> &tok);
-  std::variant<YamlNode, YamlError> parse_map(std::span<Token> &tok);
-  std::variant<YamlNode, YamlError> parse_flow_element(std::span<Token> &tok);
-  std::variant<YamlNode, YamlError> parse_flow_list(std::span<Token> &tok);
-
-  std::string_view input;
-  std::vector<Token> tokens;
-};
-
-// A tokenizer for YAML. YAML represents blocks by indentation. This
-// tokenizer inserts INDENT and DEDENT special tokens before and after
-// each indented text block.
-std::optional<YamlError> YamlParser::tokenize() {
-  std::vector<i64> indents = {0};
-
-  auto indent = [&](std::string_view str, i64 depth) {
-    tokens.push_back({INDENT, str});
-    indents.push_back(depth);
-  };
-
-  auto dedent = [&](std::string_view str) {
-    assert(indents.size() > 1);
-    tokens.push_back({DEDENT, str});
-    indents.pop_back();
-  };
-
-  auto skip_line = [](std::string_view &str) {
-    size_t pos = str.find('\n');
-    if (pos == str.npos)
-      str = str.substr(str.size());
-    else
-      str = str.substr(pos + 1);
-  };
-
-  auto tokenize_line = [&](std::string_view &str) -> std::optional<YamlError> {
-    const char *start = str.data();
-
-    if (str.starts_with("---")) {
-      while (indents.size() > 1)
-        dedent(str);
-      tokens.push_back({END, str.substr(0, 3)});
-      skip_line(str);
-      return {};
-    }
-
-    if (str.starts_with("...")) {
-      while (indents.size() > 1)
-        dedent(str);
-      tokens.push_back({END, str.substr(0, 3)});
-      str = str.substr(str.size());
-      return {};
-    }
-
-    size_t pos = str.find_first_not_of(" \t");
-    if (pos == str.npos || str[pos] == '#' || str[pos] == '\n') {
-      skip_line(str);
-      return {};
-    }
-
-    if (indents.back() != pos) {
-      if (indents.back() < pos) {
-        indent(str, pos);
-      } else {
-        while (indents.back() != pos) {
-          if (pos < indents.back())
-            dedent(str);
-          else
-            return YamlError{"bad indentation", start - input.data()};
-        }
-      }
-    }
-
-    str = str.substr(pos);
-
-    while (!str.empty()) {
-      if (str[0] == '\n') {
-        str = str.substr(1);
-        return {};
-      }
-
-      if (str.starts_with("- ")) {
-        tokens.push_back({'-', str.substr(0, 1)});
-
-        size_t pos = str.find_first_not_of(" \t", 1);
-        if (pos == str.npos || str[pos] == '\n') {
-          skip_line(str);
-          return {};
-        }
-
-        str = str.substr(pos);
-        indent(str, str.data() - start);
-        continue;
-      }
-
-      if (str.starts_with('['))
-        return tokenize_list(str);
-
-      if (str.starts_with('\'')) {
-        if (std::optional<YamlError> err = tokenize_string(str, '\''))
-          return err;
-        continue;
-      }
-
-      if (str.starts_with('"')) {
-        if (std::optional<YamlError> err = tokenize_string(str, '"'))
-          return err;
-        continue;
-      }
-
-      if (str.starts_with('#')) {
-        skip_line(str);
-        return {};
-      }
-
-      if (str.starts_with(':')) {
-        tokens.push_back({':', str.substr(0, 1)});
-
-        size_t pos = str.find_first_not_of(" \t", 1);
-        if (pos == str.npos || str[pos] == '\n') {
-          skip_line(str);
-          return {};
-        }
-
-        str = str.substr(pos);
-        continue;
-      }
-
-      tokenize_bare_string(str);
-    }
-    return {};
-  };
-
-  std::string_view str = input;
-  while (!str.empty())
-    if (std::optional<YamlError> err = tokenize_line(str))
-      return err;
-  return {};
-}
-
-std::optional<YamlError> YamlParser::tokenize_list(std::string_view &str) {
-  const char *start = str.data();
-
-  tokens.push_back({'[', str.substr(0, 1)});
-  str = str.substr(1);
-
-  while (!str.empty() && str[0] != ']') {
-    if (size_t pos = str.find_first_not_of(" \t\n"); pos) {
-      str = str.substr(pos);
-      continue;
-    }
-
-    if (str.starts_with('\'')) {
-      if (std::optional<YamlError> err = tokenize_string(str, '\''))
-        return err;
-      continue;
-    }
-
-    if (str.starts_with('"')) {
-      if (std::optional<YamlError> err = tokenize_string(str, '"'))
-        return err;
-      continue;
-    }
-
-    if (str.starts_with(',')) {
-      tokens.push_back({',', str.substr(0, 1)});
-      str = str.substr(1);
-      continue;
-    }
-
-    tokenize_bare_string(str);
-  }
-
-  if (str.empty())
-    return YamlError{"unclosed list", start - input.data()};
-
-  const char *bracket = str.data();
-  tokens.push_back({']', str.substr(0, 1)});
-  str = str.substr(1);
-
-  while (!str.empty() && (str[0] == ' ' || str[0] == '\t'))
-    str = str.substr(1);
-  if (str.empty() || str[0] != '\n')
-    return YamlError{"no newline after ']'", bracket - input.data()};
-  str = str.substr(1);
-  return {};
-}
-
-std::optional<YamlError>
-YamlParser::tokenize_string(std::string_view &str, char end) {
-  const char *start = str.data();
-  size_t pos = str.find(end, 1);
-  if (pos == str.npos)
-    return YamlError{"unterminated string literal", start - input.data()};
-
-  tokens.push_back({STRING, str.substr(1, pos - 1)});
-  str = str.substr(pos + 1);
-  return {};
-}
-
-void
-YamlParser::tokenize_bare_string(std::string_view &str) {
-  size_t pos = str.find_first_not_of(
-    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-/.");
-  if (pos == str.npos)
-    pos = str.size();
-  tokens.push_back({STRING, str.substr(0, pos)});
-  str = str.substr(pos);
-}
-
-std::variant<std::vector<YamlNode>, YamlError> YamlParser::parse() {
-  if (std::optional<YamlError> err = tokenize())
-    return *err;
-
-  std::span<Token> tok(tokens);
-  std::vector<YamlNode> vec;
-
-  while (!tok.empty()) {
-    if (tok[0].kind == END) {
-      tok = tok.subspan(1);
-      continue;
-    }
-
-    std::variant<YamlNode, YamlError> elem = parse_element(tok);
-    if (YamlError *err = std::get_if<YamlError>(&elem))
-      return *err;
-    vec.push_back(std::get<YamlNode>(elem));
-
-    if (tok[0].kind != END)
-      return YamlError{"stray token", tok[0].str.data() - input.data()};
-  }
-  return vec;
-}
-
-std::variant<YamlNode, YamlError>
-YamlParser::parse_element(std::span<Token> &tok) {
-  if (tok[0].kind == INDENT) {
-    tok = tok.subspan(1);
-
-    std::variant<YamlNode, YamlError> elem = parse_element(tok);
-    assert(tok[0].kind == DEDENT);
-    tok = tok.subspan(1);
-    return elem;
-  }
-
-  if (tok[0].kind == '-')
-    return parse_list(tok);
-
-  if (tok.size() > 2 && tok[0].kind == STRING && tok[1].kind == ':')
-    return parse_map(tok);
-
-  return parse_flow_element(tok);
-}
-
-std::variant<YamlNode, YamlError>
-YamlParser::parse_list(std::span<Token> &tok) {
-  std::vector<YamlNode> vec;
-
-  while (tok[0].kind != END && tok[0].kind != DEDENT) {
-    if (tok[0].kind != '-')
-      return YamlError{"list element expected", tok[0].str.data() - input.data()};
-    tok = tok.subspan(1);
-
-    std::variant<YamlNode, YamlError> elem = parse_element(tok);
-    if (YamlError *err = std::get_if<YamlError>(&elem))
-      return *err;
-    vec.push_back(std::get<YamlNode>(elem));
-  }
-  return YamlNode{vec};
-}
-
-std::variant<YamlNode, YamlError>
-YamlParser::parse_map(std::span<Token> &tok) {
-  std::map<std::string_view, YamlNode> map;
-
-  while (tok[0].kind != END && tok[0].kind != DEDENT) {
-    if (tok.size() < 2 || tok[0].kind != STRING || tok[1].kind != ':')
-      return YamlError{"map key expected", tok[0].str.data() - input.data()};
-
-    std::string_view key = tok[0].str;
-    tok = tok.subspan(2);
-
-    std::variant<YamlNode, YamlError> elem = parse_element(tok);
-    if (YamlError *err = std::get_if<YamlError>(&elem))
-      return *err;
-    map[key] = std::get<YamlNode>(elem);
-  }
-  return YamlNode{map};
-}
-
-std::variant<YamlNode, YamlError>
-YamlParser::parse_flow_element(std::span<Token> &tok) {
-  if (tok[0].kind == '[') {
-    tok = tok.subspan(1);
-    return parse_flow_list(tok);
-  }
-
-  if (tok[0].kind != STRING)
-    return YamlError{"scalar expected", tok[0].str.data() - input.data()};
-
-  std::string_view val = tok[0].str;
-  tok = tok.subspan(1);
-  return YamlNode{val};
-}
-
-std::variant<YamlNode, YamlError>
-YamlParser::parse_flow_list(std::span<Token> &tok) {
-  std::vector<YamlNode> vec;
-  const char *start = tok[0].str.data();
-
-  while (tok[0].kind != ']' && tok[0].kind != END) {
-    std::variant<YamlNode, YamlError> elem = parse_flow_element(tok);
-    if (YamlError *err = std::get_if<YamlError>(&elem))
-      return *err;
-    vec.push_back(std::get<YamlNode>(elem));
-
-    if (tok[0].kind == ']')
-      break;
-    if (tok[0].kind != ',')
-      return YamlError{"comma expected", tok[0].str.data() - input.data()};
-    tok = tok.subspan(1);
-  }
-
-  if (tok[0].kind == END)
-    return YamlError{"unterminated flow list", start - input.data()};
-
-  tok = tok.subspan(1);
-  return YamlNode{vec};
-}
-
-std::variant<std::vector<YamlNode>, YamlError>
-parse_yaml(std::string_view str) {
-  return YamlParser(str).parse();
-}
-
-} // namespace mold::macho

main.cc

@@ -1,115 +0,0 @@
-#include "mold.h"
-
-#include <cstring>
-#include <signal.h>
-#include <tbb/global_control.h>
-
-#ifdef USE_SYSTEM_MIMALLOC
-#include <mimalloc-new-delete.h>
-#endif
-
-namespace mold {
-
-namespace elf {
-int main(int argc, char **argv);
-}
-
-namespace macho {
-int main(int argc, char **argv);
-}
-
-static std::string get_mold_version() {
-  if (mold_git_hash.empty())
-    return "mold " MOLD_VERSION " (compatible with GNU ld)";
-  return "mold " MOLD_VERSION " (" + mold_git_hash + "; compatible with GNU ld)";
-}
-
-void cleanup() {
-  if (output_tmpfile)
-    unlink(output_tmpfile);
-  if (socket_tmpfile)
-    unlink(socket_tmpfile);
-}
-
-// mold mmap's an output file, and the mmap succeeds even if there's
-// no enough space left on the filesystem. The actual disk blocks are
-// not allocated on the mmap call but when the program writes to it
-// for the first time.
-//
-// If a disk becomes full as a result of a write to an mmap'ed memory
-// region, the failure of the write is reported as a SIGBUS or structured
-// exeption with code EXCEPTION_IN_PAGE_ERROR on Windows. This
-// signal handler catches that signal and prints out a user-friendly
-// error message. Without this, it is very hard to realize that the
-// disk might be full.
-#ifdef _WIN32
-
-static LONG WINAPI vectored_handler(_EXCEPTION_POINTERS *exception_info) {
-  static std::mutex mu;
-  std::scoped_lock lock{mu};
-
-  PEXCEPTION_RECORD exception_record = exception_info->ExceptionRecord;
-  ULONG_PTR *exception_information = exception_record->ExceptionInformation;
-  if (exception_record->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
-      (ULONG_PTR)output_buffer_start <= exception_information[1] &&
-      exception_information[1] < (ULONG_PTR)output_buffer_end) {
-
-    const char msg[] = "mold: failed to write to an output file. Disk full?\n";
-    (void)!write(_fileno(stderr), msg, sizeof(msg) - 1);
-  }
-
-  cleanup();
-  _exit(1);
-}
-
-void install_signal_handler() {
-  AddVectoredExceptionHandler(0, vectored_handler);
-}
-
-#else
-
-static void sighandler(int signo, siginfo_t *info, void *ucontext) {
-  static std::mutex mu;
-  std::scoped_lock lock{mu};
-
-  if ((signo == SIGSEGV || signo == SIGBUS) &&
-      output_buffer_start <= info->si_addr &&
-      info->si_addr < output_buffer_end) {
-    const char msg[] = "mold: failed to write to an output file. Disk full?\n";
-    (void)!write(STDERR_FILENO, msg, sizeof(msg) - 1);
-  }
-
-  cleanup();
-  _exit(1);
-}
-
-void install_signal_handler() {
-  struct sigaction action;
-  action.sa_sigaction = sighandler;
-  sigemptyset(&action.sa_mask);
-  action.sa_flags = SA_SIGINFO;
-
-  sigaction(SIGINT, &action, NULL);
-  sigaction(SIGTERM, &action, NULL);
-  sigaction(SIGBUS, &action, NULL);
-}
-
-#endif
-
-i64 get_default_thread_count() {
-  // mold doesn't scale well above 32 threads.
-  int n = tbb::global_control::active_value(
-    tbb::global_control::max_allowed_parallelism);
-  return std::min(n, 32);
-}
-
-} // namespace mold
-
-int main(int argc, char **argv) {
-  mold::mold_version = mold::get_mold_version();
-
-  std::string cmd = mold::filepath(argv[0]).filename().string();
-  if (cmd == "ld64" || cmd == "ld64.mold")
-    return mold::macho::main(argc, argv);
-  return mold::elf::main(argc, argv);
-}

mold.h

@@ -1,862 +0,0 @@
-#pragma once
-
-#include "inttypes.h"
-
-#include <array>
-#include <atomic>
-#include <bit>
-#include <bitset>
-#include <cassert>
-#include <cstdio>
-#include <cstring>
-#include <fcntl.h>
-#include <filesystem>
-#include <iostream>
-#include <mutex>
-#include <optional>
-#include <span>
-#include <sstream>
-#include <string>
-#include <string_view>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <tbb/concurrent_vector.h>
-#include <tbb/enumerable_thread_specific.h>
-#include <vector>
-
-#ifdef _WIN32
-#include <io.h>
-#else
-#include <sys/mman.h>
-#include <unistd.h>
-#endif
-
-#define XXH_INLINE_ALL 1
-#include "third-party/xxhash/xxhash.h"
-
-#ifdef _MSC_VER
-#  define unreachable() __assume(0)
-#elif defined(NDEBUG)
-#  define unreachable() __builtin_unreachable()
-#else
-#  define unreachable() assert(0 && "unreachable")
-#endif
-
-inline uint64_t hash_string(std::string_view str) {
-  return XXH3_64bits(str.data(), str.size());
-}
-
-class HashCmp {
-public:
-  static size_t hash(const std::string_view &k) {
-    return hash_string(k);
-  }
-
-  static bool equal(const std::string_view &k1, const std::string_view &k2) {
-    return k1 == k2;
-  }
-};
-
-namespace mold {
-
-using namespace std::literals::string_literals;
-using namespace std::literals::string_view_literals;
-
-typedef uint8_t u8;
-typedef uint16_t u16;
-typedef uint32_t u32;
-typedef uint64_t u64;
-
-typedef int8_t i8;
-typedef int16_t i16;
-typedef int32_t i32;
-typedef int64_t i64;
-
-template <typename C> class OutputFile;
-
-inline char *output_tmpfile;
-inline char *socket_tmpfile;
-inline thread_local bool opt_demangle;
-
-inline u8 *output_buffer_start = nullptr;
-inline u8 *output_buffer_end = nullptr;
-
-inline std::string mold_version;
-extern std::string mold_git_hash;
-
-std::string_view errno_string();
-void cleanup();
-void install_signal_handler();
-i64 get_default_thread_count();
-
-//
-// Error output
-//
-
-template <typename C>
-class SyncOut {
-public:
-  SyncOut(C &ctx, std::ostream &out = std::cout) : out(out) {
-    opt_demangle = ctx.arg.demangle;
-  }
-
-  ~SyncOut() {
-    std::scoped_lock lock(mu);
-    out << ss.str() << "\n";
-  }
-
-  template <class T> SyncOut &operator<<(T &&val) {
-    ss << std::forward<T>(val);
-    return *this;
-  }
-
-  static inline std::mutex mu;
-
-private:
-  std::ostream &out;
-  std::stringstream ss;
-};
-
-template <typename C>
-static std::string add_color(C &ctx, std::string msg) {
-  if (ctx.arg.color_diagnostics)
-    return "mold: \033[0;1;31m" + msg + ":\033[0m ";
-  return "mold: " + msg + ": ";
-}
-
-template <typename C>
-class Fatal {
-public:
-  Fatal(C &ctx) : out(ctx, std::cerr) {
-    out << add_color(ctx, "fatal");
-  }
-
-  [[noreturn]] ~Fatal() {
-    out.~SyncOut();
-    cleanup();
-    _exit(1);
-  }
-
-  template <class T> Fatal &operator<<(T &&val) {
-    out << std::forward<T>(val);
-    return *this;
-  }
-
-private:
-  SyncOut<C> out;
-};
-
-template <typename C>
-class Error {
-public:
-  Error(C &ctx) : out(ctx, std::cerr) {
-    if (ctx.arg.noinhibit_exec) {
-      out << add_color(ctx, "warning");
-    } else {
-      out << add_color(ctx, "error");
-      ctx.has_error = true;
-    }
-  }
-
-  template <class T> Error &operator<<(T &&val) {
-    out << std::forward<T>(val);
-    return *this;
-  }
-
-private:
-  SyncOut<C> out;
-};
-
-template <typename C>
-class Warn {
-public:
-  Warn(C &ctx) : out(ctx, std::cerr) {
-    if (ctx.arg.fatal_warnings) {
-      out << add_color(ctx, "error");
-      ctx.has_error = true;
-    } else {
-      out << add_color(ctx, "warning");
-    }
-  }
-
-  template <class T> Warn &operator<<(T &&val) {
-    out << std::forward<T>(val);
-    return *this;
-  }
-
-private:
-  SyncOut<C> out;
-};
-
-//
-// Utility functions
-//
-
-// Some C++ libraries haven't implemented std::has_single_bit yet.
-inline bool has_single_bit(u64 val) {
-  return std::popcount(val) == 1;
-}
-
-// Some C++ libraries haven't implemented std::bit_ceil yet.
-inline u64 bit_ceil(u64 val) {
-  if (has_single_bit(val))
-    return val;
-  return (u64)1 << (64 - std::countl_zero(val));
-}
-
-inline u64 align_to(u64 val, u64 align) {
-  if (align == 0)
-    return val;
-  assert(has_single_bit(align));
-  return (val + align - 1) & ~(align - 1);
-}
-
-inline u64 align_down(u64 val, u64 align) {
-  assert(has_single_bit(align));
-  return val & ~(align - 1);
-}
-
-inline u64 bit(u64 val, i64 pos) {
-  return (val >> pos) & 1;
-};
-
-// Returns [hi:lo] bits of val.
-inline u64 bits(u64 val, u64 hi, u64 lo) {
-  return (val >> lo) & (((u64)1 << (hi - lo + 1)) - 1);
-}
-
-inline i64 sign_extend(u64 val, i64 size) {
-  return (i64)(val << (63 - size)) >> (63 - size);
-};
-
-template <typename T, typename Compare = std::less<T>>
-void update_minimum(std::atomic<T> &atomic, u64 new_val, Compare cmp = {}) {
-  T old_val = atomic;
-  while (cmp(new_val, old_val) &&
-         !atomic.compare_exchange_weak(old_val, new_val));
-}
-
-template <typename T, typename Compare = std::less<T>>
-void update_maximum(std::atomic<T> &atomic, u64 new_val, Compare cmp = {}) {
-  T old_val = atomic;
-  while (cmp(old_val, new_val) &&
-         !atomic.compare_exchange_weak(old_val, new_val));
-}
-
-template <typename T, typename U>
-inline void append(std::vector<T> &vec1, std::vector<U> vec2) {
-  vec1.insert(vec1.end(), vec2.begin(), vec2.end());
-}
-
-template <typename T>
-inline std::vector<T> flatten(std::vector<std::vector<T>> &vec) {
-  std::vector<T> ret;
-  for (std::vector<T> &v : vec)
-    append(ret, v);
-  return ret;
-}
-
-template <typename T>
-inline void sort(T &vec) {
-  std::stable_sort(vec.begin(), vec.end());
-}
-
-template <typename T, typename U>
-inline void sort(T &vec, U less) {
-  std::stable_sort(vec.begin(), vec.end(), less);
-}
-
-template <typename T>
-inline void remove_duplicates(std::vector<T> &vec) {
-  vec.erase(std::unique(vec.begin(), vec.end()), vec.end());
-}
-
-inline i64 write_string(void *buf, std::string_view str) {
-  memcpy(buf, str.data(), str.size());
-  *((u8 *)buf + str.size()) = '\0';
-  return str.size() + 1;
-}
-
-template <typename T>
-inline i64 write_vector(void *buf, const std::vector<T> &vec) {
-  i64 sz = vec.size() * sizeof(T);
-  memcpy(buf, vec.data(), sz);
-  return sz;
-}
-
-inline void encode_uleb(std::vector<u8> &vec, u64 val) {
-  do {
-    u8 byte = val & 0x7f;
-    val >>= 7;
-    vec.push_back(val ? (byte | 0x80) : byte);
-  } while (val);
-}
-
-inline i64 write_uleb(u8 *buf, u64 val) {
-  i64 i = 0;
-  do {
-    u8 byte = val & 0x7f;
-    val >>= 7;
-    buf[i++] = val ? (byte | 0x80) : byte;
-  } while (val);
-  return i;
-}
-
-inline u64 read_uleb(u8 *&buf) {
-  u64 val = 0;
-  u8 shift = 0;
-  u8 byte;
-  do {
-    byte = *buf++;
-    val |= (byte & 0x7f) << shift;
-    shift += 7;
-  } while (byte & 0x80);
-  return val;
-}
-
-inline u64 read_uleb(u8 const*&buf) {
-  return read_uleb(const_cast<u8 *&>(buf));
-}
-
-inline u64 read_uleb(std::string_view &str) {
-  u8 *start = (u8 *)&str[0];
-  u8 *ptr = start;
-  u64 val = read_uleb(ptr);
-  str = str.substr(ptr - start);
-  return val;
-}
-
-inline i64 uleb_size(u64 val) {
-#if __GNUC__
-#pragma GCC unroll 8
-#endif
-  for (int i = 1; i < 9; i++)
-    if (val < ((u64)1 << (7 * i)))
-      return i;
-  return 9;
-}
-
-template <typename C>
-std::string_view save_string(C &ctx, const std::string &str) {
-  u8 *buf = new u8[str.size() + 1];
-  memcpy(buf, str.data(), str.size());
-  buf[str.size()] = '\0';
-  ctx.string_pool.push_back(std::unique_ptr<u8[]>(buf));
-  return {(char *)buf, str.size()};
-}
-
-inline bool remove_prefix(std::string_view &s, std::string_view prefix) {
-  if (s.starts_with(prefix)) {
-    s = s.substr(prefix.size());
-    return true;
-  }
-  return false;
-}
-
-//
-// Concurrent Map
-//
-
-// This is an implementation of a fast concurrent hash map. Unlike
-// ordinary hash tables, this impl just aborts if it becomes full.
-// So you need to give a correct estimation of the final size before
-// using it. We use this hash map to uniquify pieces of data in
-// mergeable sections.
-template <typename T>
-class ConcurrentMap {
-public:
-  ConcurrentMap() {}
-
-  ConcurrentMap(i64 nbuckets) {
-    resize(nbuckets);
-  }
-
-  ~ConcurrentMap() {
-    if (keys) {
-      free((void *)keys);
-      free((void *)key_sizes);
-      free((void *)values);
-    }
-  }
-
-  void resize(i64 nbuckets) {
-    this->~ConcurrentMap();
-
-    nbuckets = std::max<i64>(MIN_NBUCKETS, bit_ceil(nbuckets));
-
-    this->nbuckets = nbuckets;
-    keys = (std::atomic<const char *> *)calloc(nbuckets, sizeof(keys[0]));
-    key_sizes = (u32 *)calloc(nbuckets, sizeof(key_sizes[0]));
-    values = (T *)calloc(nbuckets, sizeof(values[0]));
-  }
-
-  std::pair<T *, bool> insert(std::string_view key, u64 hash, const T &val) {
-    if (!keys)
-      return {nullptr, false};
-
-    assert(has_single_bit(nbuckets));
-    i64 idx = hash & (nbuckets - 1);
-    i64 retry = 0;
-
-    while (retry < MAX_RETRY) {
-      const char *ptr = keys[idx];
-      if (ptr == marker) {
-        pause();
-        continue;
-      }
-
-      if (ptr == nullptr) {
-        if (!keys[idx].compare_exchange_weak(ptr, marker))
-          continue;
-        new (values + idx) T(val);
-        key_sizes[idx] = key.size();
-        keys[idx] = key.data();
-        return {values + idx, true};
-      }
-
-      if (key.size() == key_sizes[idx] &&
-          memcmp(ptr, key.data(), key_sizes[idx]) == 0)
-        return {values + idx, false};
-
-      u64 mask = nbuckets / NUM_SHARDS - 1;
-      idx = (idx & ~mask) | ((idx + 1) & mask);
-      retry++;
-    }
-
-    assert(false && "ConcurrentMap is full");
-    return {nullptr, false};
-  }
-
-  bool has_key(i64 idx) {
-    return keys[idx].load(std::memory_order_relaxed);
-  }
-
-  static constexpr i64 MIN_NBUCKETS = 2048;
-  static constexpr i64 NUM_SHARDS = 16;
-  static constexpr i64 MAX_RETRY = 128;
-
-  i64 nbuckets = 0;
-  std::atomic<const char *> *keys = nullptr;
-  u32 *key_sizes = nullptr;
-  T *values = nullptr;
-
-private:
-  static void pause() {
-#if defined(__x86_64__)
-    asm volatile("pause");
-#elif defined(__aarch64__)
-    asm volatile("yield");
-#endif
-  }
-
-  static constexpr const char *marker = "marker";
-};
-
-//
-// output-file.h
-//
-
-template <typename C>
-class OutputFile {
-public:
-  static std::unique_ptr<OutputFile<C>>
-  open(C &ctx, std::string path, i64 filesize, i64 perm);
-
-  virtual void close(C &ctx) = 0;
-  virtual ~OutputFile() = default;
-
-  u8 *buf = nullptr;
-  std::string path;
-  i64 filesize;
-  bool is_mmapped;
-  bool is_unmapped = false;
-
-protected:
-  OutputFile(std::string path, i64 filesize, bool is_mmapped)
-    : path(path), filesize(filesize), is_mmapped(is_mmapped) {}
-};
-
-//
-// hyperloglog.cc
-//
-
-class HyperLogLog {
-public:
-  HyperLogLog() : buckets(NBUCKETS) {}
-
-  void insert(u32 hash) {
-    update_maximum(buckets[hash & (NBUCKETS - 1)], std::countl_zero(hash) + 1);
-  }
-
-  i64 get_cardinality() const;
-
-  void merge(const HyperLogLog &other) {
-    for (i64 i = 0; i < NBUCKETS; i++)
-      update_maximum(buckets[i], other.buckets[i]);
-  }
-
-private:
-  static constexpr i64 NBUCKETS = 2048;
-  static constexpr double ALPHA = 0.79402;
-
-  std::vector<std::atomic_uint8_t> buckets;
-};
-
-//
-// glob.cc
-//
-
-class Glob {
-  typedef enum { STRING, STAR, QUESTION, BRACKET } Kind;
-
-  struct Element {
-    Element(Kind k) : kind(k) {}
-    Kind kind;
-    std::string str;
-    std::bitset<256> bitset;
-  };
-
-public:
-  static std::optional<Glob> compile(std::string_view pat);
-  bool match(std::string_view str);
-
-private:
-  Glob(std::vector<Element> &&vec) : elements(vec) {}
-  static bool do_match(std::string_view str, std::span<Element> elements);
-
-  std::vector<Element> elements;
-};
-
-//
-// multi-glob.cc
-//
-
-class MultiGlob {
-public:
-  bool add(std::string_view pat, u32 val);
-  bool empty() const { return strings.empty(); }
-  std::optional<u32> find(std::string_view str);
-
-private:
-  struct TrieNode {
-    u32 value = -1;
-    TrieNode *suffix_link = nullptr;
-    std::unique_ptr<TrieNode> children[256];
-  };
-
-  void compile();
-  void fix_suffix_links(TrieNode &node);
-  void fix_values();
-
-  std::vector<std::string> strings;
-  std::unique_ptr<TrieNode> root;
-  std::vector<std::pair<Glob, u32>> globs;
-  std::vector<u32> values;
-  std::once_flag once;
-  bool is_compiled = false;
-};
-
-//
-// uuid.cc
-//
-
-std::array<u8, 16> get_uuid_v4();
-
-//
-// filepath.cc
-//
-
-template <typename T>
-std::filesystem::path filepath(const T &path) {
-  return {path, std::filesystem::path::format::generic_format};
-}
-
-std::string get_realpath(std::string_view path);
-std::string path_clean(std::string_view path);
-std::filesystem::path to_abs_path(std::filesystem::path path);
-
-//
-// demangle.cc
-//
-
-std::string_view demangle(std::string_view name);
-std::optional<std::string_view> cpp_demangle(std::string_view name);
-
-//
-// compress.cc
-//
-
-class ZlibCompressor {
-public:
-  ZlibCompressor(u8 *buf, i64 size);
-  void write_to(u8 *buf);
-  i64 size() const;
-
-private:
-  std::vector<std::vector<u8>> shards;
-  u64 checksum = 0;
-};
-
-class GzipCompressor {
-public:
-  GzipCompressor(std::string_view input);
-  void write_to(u8 *buf);
-  i64 size() const;
-
-private:
-  std::vector<std::vector<u8>> shards;
-  u32 checksum = 0;
-  u32 uncompressed_size = 0;
-};
-
-//
-// perf.cc
-//
-
-// Counter is used to collect statistics numbers.
-class Counter {
-public:
-  Counter(std::string_view name, i64 value = 0) : name(name), values(value) {
-    static std::mutex mu;
-    std::scoped_lock lock(mu);
-    instances.push_back(this);
-  }
-
-  Counter &operator++(int) {
-    if (enabled)
-      values.local()++;
-    return *this;
-  }
-
-  Counter &operator+=(int delta) {
-    if (enabled)
-      values.local() += delta;
-    return *this;
-  }
-
-  static void print();
-
-  static inline bool enabled = false;
-
-private:
-  i64 get_value();
-
-  std::string_view name;
-  tbb::enumerable_thread_specific<i64> values;
-
-  static inline std::vector<Counter *> instances;
-};
-
-// Timer and TimeRecord records elapsed time (wall clock time)
-// used by each pass of the linker.
-struct TimerRecord {
-  TimerRecord(std::string name, TimerRecord *parent = nullptr);
-  void stop();
-
-  std::string name;
-  TimerRecord *parent;
-  tbb::concurrent_vector<TimerRecord *> children;
-  i64 start;
-  i64 end;
-  i64 user;
-  i64 sys;
-  bool stopped = false;
-};
-
-void
-print_timer_records(tbb::concurrent_vector<std::unique_ptr<TimerRecord>> &);
-
-template <typename C>
-class Timer {
-public:
-  Timer(C &ctx, std::string name, Timer *parent = nullptr) {
-    record = new TimerRecord(name, parent ? parent->record : nullptr);
-    ctx.timer_records.push_back(std::unique_ptr<TimerRecord>(record));
-  }
-
-  Timer(const Timer &) = delete;
-
-  ~Timer() {
-    record->stop();
-  }
-
-  void stop() {
-    record->stop();
-  }
-
-private:
-  TimerRecord *record;
-};
-
-//
-// tar.cc
-//
-
-// TarFile is a class to create a tar file.
-//
-// If you pass `--repro` to mold, mold collects all input files and
-// put them into `<output-file-path>.repro.tar`, so that it is easy to
-// run the same command with the same command line arguments.
-class TarWriter {
-public:
-  static std::unique_ptr<TarWriter>
-  open(std::string output_path, std::string basedir);
-
-  ~TarWriter();
-  void append(std::string path, std::string_view data);
-
-private:
-  static constexpr i64 BLOCK_SIZE = 512;
-
-  TarWriter(FILE *out, std::string basedir) : out(out), basedir(basedir) {}
-
-  FILE *out = nullptr;
-  std::string basedir;
-};
-
-//
-// Memory-mapped file
-//
-
-// MappedFile represents an mmap'ed input file.
-// mold uses mmap-IO only.
-template <typename C>
-class MappedFile {
-public:
-  static MappedFile *open(C &ctx, std::string path);
-  static MappedFile *must_open(C &ctx, std::string path);
-
-  ~MappedFile();
-
-  MappedFile *slice(C &ctx, std::string name, u64 start, u64 size);
-
-  std::string_view get_contents() {
-    return std::string_view((char *)data, size);
-  }
-
-  i64 get_offset() const {
-    return parent ? (data - parent->data + parent->get_offset()) : 0;
-  }
-
-  // Returns a string that uniquely identify a file that is possibly
-  // in an archive.
-  std::string get_identifier() const {
-    if (parent) {
-      // We use the file offset within an archive as an identifier
-      // because archive members may have the same name.
-      return parent->name + ":" + std::to_string(get_offset());
-    }
-
-    if (thin_parent) {
-      // If this is a thin archive member, the filename part is
-      // guaranteed to be unique.
-      return thin_parent->name + ":" + name;
-    }
-    return name;
-  }
-
-  std::string name;
-  u8 *data = nullptr;
-  i64 size = 0;
-  i64 mtime = 0;
-  bool given_fullpath = true;
-  MappedFile *parent = nullptr;
-  MappedFile *thin_parent = nullptr;
-  int fd = -1;
-#ifdef _WIN32
-  HANDLE file_handle = INVALID_HANDLE_VALUE;
-#endif
-};
-
-template <typename C>
-MappedFile<C> *MappedFile<C>::open(C &ctx, std::string path) {
-  if (path.starts_with('/') && !ctx.arg.chroot.empty())
-    path = ctx.arg.chroot + "/" + path_clean(path);
-
-
-  i64 fd;
-#ifdef _WIN32
-    fd = ::_open(path.c_str(), O_RDONLY);
-#else
-    fd = ::open(path.c_str(), O_RDONLY);
-#endif
-
-  if (fd == -1)
-    return nullptr;
-
-  struct stat st;
-  if (fstat(fd, &st) == -1)
-    Fatal(ctx) << path << ": fstat failed: " << errno_string();
-
-  MappedFile *mf = new MappedFile;
-  ctx.mf_pool.push_back(std::unique_ptr<MappedFile>(mf));
-
-  mf->name = path;
-  mf->size = st.st_size;
-
-#ifdef _WIN32
-    mf->mtime = st.st_mtime;
-#elif defined(__APPLE__)
-    mf->mtime = (u64)st.st_mtimespec.tv_sec * 1000000000 + st.st_mtimespec.tv_nsec;
-#else
-    mf->mtime = (u64)st.st_mtim.tv_sec * 1000000000 + st.st_mtim.tv_nsec;
-#endif
-
-  if (st.st_size > 0) {
-#ifdef _WIN32
-    HANDLE handle = CreateFileMapping((HANDLE)_get_osfhandle(fd),
-                                      nullptr, PAGE_READWRITE, 0,
-                                      st.st_size, nullptr);
-    if (!handle)
-      Fatal(ctx) << path << ": CreateFileMapping failed: " << GetLastError();
-    mf->file_handle = handle;
-    mf->data = (u8 *)MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, st.st_size);
-    if (!mf->data)
-      Fatal(ctx) << path << ": MapViewOfFile failed: " << GetLastError();
-#else
-    mf->data = (u8 *)mmap(nullptr, st.st_size, PROT_READ | PROT_WRITE,
-                          MAP_PRIVATE, fd, 0);
-    if (mf->data == MAP_FAILED)
-      Fatal(ctx) << path << ": mmap failed: " << errno_string();
-#endif
-    }
-
-  close(fd);
-  return mf;
-}
-
-template <typename C>
-MappedFile<C> *MappedFile<C>::must_open(C &ctx, std::string path) {
-  if (MappedFile *mf = MappedFile::open(ctx, path))
-    return mf;
-  Fatal(ctx) << "cannot open " << path << ": " << errno_string();
-}
-
-template <typename C>
-MappedFile<C> *
-MappedFile<C>::slice(C &ctx, std::string name, u64 start, u64 size) {
-  MappedFile *mf = new MappedFile<C>;
-  mf->name = name;
-  mf->data = data + start;
-  mf->size = size;
-  mf->parent = this;
-
-  ctx.mf_pool.push_back(std::unique_ptr<MappedFile>(mf));
-  return mf;
-}
-
-template <typename C>
-MappedFile<C>::~MappedFile() {
-  if (size == 0 || parent)
-    return;
-
-#ifdef _WIN32
-  UnmapViewOfFile(data);
-  if (file_handle != INVALID_HANDLE_VALUE)
-    CloseHandle(file_handle);
-#else
-  munmap(data, size);
-#endif
-}
-
-} // namespace mold

multi-glob.cc

@@ -1,168 +0,0 @@
-// This file implements the Aho-Corasick algorithm to match multiple
-// glob patterns to symbol strings as quickly as possible.
-//
-// Here are some examples of glob patterns:
-//
-//    qt_private_api_tag*
-//    *16QAccessibleCache*
-//    *32QAbstractFileIconProviderPrivate*
-//    *17QPixmapIconEngine*
-//
-// `*` is a wildcard that matches any substring. We sometimes have
-// hundreds of glob patterns and have to match them against millions
-// of symbol strings.
-//
-// Aho-Corasick cannot handle complex patterns such as `*foo*bar*`.
-// We handle such patterns with the Glob class. Glob is relatively
-// slow, but complex patterns are rare in practice, so it should be
-// OK.
-
-#include "mold.h"
-
-#include <queue>
-#include <regex>
-
-namespace mold {
-
-std::optional<u32> MultiGlob::find(std::string_view str) {
-  std::call_once(once, [&] { compile(); });
-  u32 idx = UINT32_MAX;
-
-  if (root) {
-    // Match against simple glob patterns
-    TrieNode *node = root.get();
-
-    auto walk = [&](u8 c) {
-      for (;;) {
-        if (node->children[c]) {
-          node = node->children[c].get();
-          idx = std::min(idx, node->value);
-          return;
-        }
-
-        if (!node->suffix_link)
-          return;
-        node = node->suffix_link;
-      }
-    };
-
-    walk('\0');
-    for (u8 c : str)
-      walk(c);
-    walk('\0');
-  }
-
-  // Match against complex glob patterns
-  for (std::pair<Glob, u32> &glob : globs)
-    if (glob.first.match(str))
-      idx = std::min(idx, glob.second);
-
-  if (idx == UINT32_MAX)
-    return {};
-  return values[idx];
-}
-
-static bool is_simple_pattern(std::string_view pat) {
-  static std::regex re(R"(\*?[^*[?]+\*?)", std::regex_constants::optimize);
-  return std::regex_match(pat.begin(), pat.end(), re);
-}
-
-static std::string handle_stars(std::string_view pat) {
-  std::string str(pat);
-
-  // Convert "foo" -> "\0foo\0", "*foo" -> "foo\0", "foo*" -> "\0foo"
-  // and "*foo*" -> "foo". Aho-Corasick can do only substring matching,
-  // so we use \0 as beginning/end-of-string markers.
-  if (str.starts_with('*') && str.ends_with('*'))
-    return str.substr(1, str.size() - 2);
-  if (str.starts_with('*'))
-    return str.substr(1) + "\0"s;
-  if (str.ends_with('*'))
-    return "\0"s + str.substr(0, str.size() - 1);
-  return "\0"s + str + "\0"s;
-}
-
-bool MultiGlob::add(std::string_view pat, u32 val) {
-  assert(!is_compiled);
-  assert(!pat.empty());
-
-  u32 idx = strings.size();
-  strings.push_back(std::string(pat));
-  values.push_back(val);
-
-  // Complex glob pattern
-  if (!is_simple_pattern(pat)) {
-    if (std::optional<Glob> glob = Glob::compile(pat)) {
-      globs.push_back({std::move(*glob), idx});
-      return true;
-    }
-    return false;
-  }
-
-  // Simple glob pattern
-  if (!root)
-    root.reset(new TrieNode);
-  TrieNode *node = root.get();
-
-  for (u8 c : handle_stars(pat)) {
-    if (!node->children[c])
-      node->children[c].reset(new TrieNode);
-    node = node->children[c].get();
-  }
-
-  node->value = std::min(node->value, idx);
-  return true;
-}
-
-void MultiGlob::compile() {
-  is_compiled = true;
-  if (root) {
-    fix_suffix_links(*root);
-    fix_values();
-  }
-}
-
-void MultiGlob::fix_suffix_links(TrieNode &node) {
-  for (i64 i = 0; i < 256; i++) {
-    if (!node.children[i])
-      continue;
-
-    TrieNode &child = *node.children[i];
-
-    TrieNode *cur = node.suffix_link;
-    for (;;) {
-      if (!cur) {
-        child.suffix_link = root.get();
-        break;
-      }
-
-      if (cur->children[i]) {
-        child.suffix_link = cur->children[i].get();
-        break;
-      }
-
-      cur = cur->suffix_link;
-    }
-
-    fix_suffix_links(child);
-  }
-}
-
-void MultiGlob::fix_values() {
-  std::queue<TrieNode *> queue;
-  queue.push(root.get());
-
-  do {
-    TrieNode *node = queue.front();
-    queue.pop();
-
-    for (std::unique_ptr<TrieNode> &child : node->children) {
-      if (!child)
-        continue;
-      child->value = std::min(child->value, child->suffix_link->value);
-      queue.push(child.get());
-    }
-  } while (!queue.empty());
-}
-
-} // namespace mold

output-file-unix.h

@@ -1,141 +0,0 @@
-#include "mold.h"
-
-#include <fcntl.h>
-#include <filesystem>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-
-namespace mold {
-
-inline u32 get_umask() {
-  u32 orig_umask = umask(0);
-  umask(orig_umask);
-  return orig_umask;
-}
-
-template <typename C>
-static std::pair<i64, char *>
-open_or_create_file(C &ctx, std::string path, i64 filesize, i64 perm) {
-  std::string tmpl = filepath(path).parent_path() / ".mold-XXXXXX";
-  char *path2 = (char *)save_string(ctx, tmpl).data();
-
-  i64 fd = mkstemp(path2);
-  if (fd == -1)
-    Fatal(ctx) << "cannot open " << path2 <<  ": " << errno_string();
-
-  // Reuse an existing file if exists and writable because on Linux,
-  // writing to an existing file is much faster than creating a fresh
-  // file and writing to it.
-  if (ctx.overwrite_output_file && rename(path.c_str(), path2) == 0) {
-    ::close(fd);
-    fd = ::open(path2, O_RDWR | O_CREAT, perm);
-    if (fd != -1 && !ftruncate(fd, filesize) && !fchmod(fd, perm & ~get_umask()))
-      return {fd, path2};
-
-    unlink(path2);
-    fd = ::open(path2, O_RDWR | O_CREAT, perm);
-    if (fd == -1)
-      Fatal(ctx) << "cannot open " << path2 << ": " << errno_string();
-  }
-
-  if (ftruncate(fd, filesize))
-    Fatal(ctx) << "ftruncate failed: " << errno_string();
-
-  if (fchmod(fd, (perm & ~get_umask())) == -1)
-    Fatal(ctx) << "fchmod failed: " << errno_string();
-  return {fd, path2};
-}
-
-template <typename C>
-class MemoryMappedOutputFile : public OutputFile<C> {
-public:
-  MemoryMappedOutputFile(C &ctx, std::string path, i64 filesize, i64 perm)
-    : OutputFile<C>(path, filesize, true) {
-    i64 fd;
-    std::tie(fd, output_tmpfile) = open_or_create_file(ctx, path, filesize, perm);
-
-    this->buf = (u8 *)mmap(nullptr, filesize, PROT_READ | PROT_WRITE,
-                           MAP_SHARED, fd, 0);
-    if (this->buf == MAP_FAILED)
-      Fatal(ctx) << path << ": mmap failed: " << errno_string();
-    ::close(fd);
-
-    mold::output_buffer_start = this->buf;
-    mold::output_buffer_end = this->buf + filesize;
-  }
-
-  void close(C &ctx) override {
-    Timer t(ctx, "close_file");
-
-    if (!this->is_unmapped)
-      munmap(this->buf, this->filesize);
-
-    if (rename(output_tmpfile, this->path.c_str()) == -1)
-      Fatal(ctx) << this->path << ": rename failed: " << errno_string();
-    output_tmpfile = nullptr;
-  }
-};
-
-template <typename C>
-class MallocOutputFile : public OutputFile<C> {
-public:
-  MallocOutputFile(C &ctx, std::string path, i64 filesize, i64 perm)
-    : OutputFile<C>(path, filesize, false), perm(perm) {
-    this->buf = (u8 *)mmap(NULL, filesize, PROT_READ | PROT_WRITE,
-                           MAP_SHARED | MAP_ANONYMOUS, -1, 0);
-    if (this->buf == MAP_FAILED)
-      Fatal(ctx) << "mmap failed: " << errno_string();
-  }
-
-  void close(C &ctx) override {
-    Timer t(ctx, "close_file");
-
-    if (this->path == "-") {
-      fwrite(this->buf, this->filesize, 1, stdout);
-      fclose(stdout);
-      return;
-    }
-
-    i64 fd = ::open(this->path.c_str(), O_RDWR | O_CREAT, perm);
-    if (fd == -1)
-      Fatal(ctx) << "cannot open " << this->path << ": " << errno_string();
-
-    FILE *fp = fdopen(fd, "w");
-    fwrite(this->buf, this->filesize, 1, fp);
-    fclose(fp);
-  }
-
-private:
-  i64 perm;
-};
-
-template <typename C>
-std::unique_ptr<OutputFile<C>>
-OutputFile<C>::open(C &ctx, std::string path, i64 filesize, i64 perm) {
-  Timer t(ctx, "open_file");
-
-  if (path.starts_with('/') && !ctx.arg.chroot.empty())
-    path = ctx.arg.chroot + "/" + path_clean(path);
-
-  bool is_special = false;
-  if (path == "-") {
-    is_special = true;
-  } else {
-    struct stat st;
-    if (stat(path.c_str(), &st) == 0 && (st.st_mode & S_IFMT) != S_IFREG)
-      is_special = true;
-  }
-
-  OutputFile<C> *file;
-  if (is_special)
-    file = new MallocOutputFile<C>(ctx, path, filesize, perm);
-  else
-    file = new MemoryMappedOutputFile<C>(ctx, path, filesize, perm);
-
-  if (ctx.arg.filler != -1)
-    memset(file->buf, ctx.arg.filler, filesize);
-  return std::unique_ptr<OutputFile<C>>(file);
-}
-
-} // namespace mold

output-file-win32.h

@@ -1,57 +0,0 @@
-#include "mold.h"
-
-#include <fcntl.h>
-#include <filesystem>
-#include <windows.h>
-
-namespace mold {
-
-template <typename C>
-class MallocOutputFile : public OutputFile<C> {
-public:
-  MallocOutputFile(C &ctx, std::string path, i64 filesize, i64 perm)
-    : OutputFile<C>(path, filesize, false), perm(perm) {
-    this->buf = (u8 *)malloc(filesize);
-    if (!this->buf)
-      Fatal(ctx) << "malloc failed";
-  }
-
-  void close(C &ctx) override {
-    Timer t(ctx, "close_file");
-
-    if (this->path == "-") {
-      fwrite(this->buf, this->filesize, 1, stdout);
-      fclose(stdout);
-      return;
-    }
-
-    i64 fd = ::open(this->path.c_str(), O_RDWR | O_CREAT, perm);
-    if (fd == -1)
-      Fatal(ctx) << "cannot open " << this->path << ": " << errno_string();
-
-    FILE *fp = fdopen(fd, "w");
-    fwrite(this->buf, this->filesize, 1, fp);
-    fclose(fp);
-    free(this->buf);
-  }
-
-private:
-  i64 perm;
-};
-
-template <typename C>
-std::unique_ptr<OutputFile<C>>
-OutputFile<C>::open(C &ctx, std::string path, i64 filesize, i64 perm) {
-  Timer t(ctx, "open_file");
-
-  if (path.starts_with('/') && !ctx.arg.chroot.empty())
-    path = ctx.arg.chroot + "/" + path_clean(path);
-
-  OutputFile<C> *file = new MallocOutputFile<C>(ctx, path, filesize, perm);
-
-  if (ctx.arg.filler != -1)
-    memset(file->buf, ctx.arg.filler, filesize);
-  return std::unique_ptr<OutputFile<C>>(file);
-}
-
-} // namespace mold

output-file.h

@@ -1,5 +0,0 @@
-#if _WIN32
-# include "output-file-win32.h"
-#else
-# include "output-file-unix.h"
-#endif

sha.h

@@ -1,81 +0,0 @@
-#pragma once
-
-#include <cstdint>
-
-typedef uint8_t u8;
-static constexpr int64_t SHA256_SIZE = 32;
-
-#ifdef _WIN32
-// On Windows, we use Microsoft CNG.
-
-#include <Windows.h>
-#include <bcrypt.h>
-#include <ntstatus.h>
-
-inline static BCRYPT_ALG_HANDLE get_sha256_handle() {
-  static std::once_flag once;
-  static BCRYPT_ALG_HANDLE alg;
-
-  std::call_once(once, [&]() {
-    BCryptOpenAlgorithmProvider(&alg, BCRYPT_SHA256_ALGORITHM, nullptr, 0);
-  });
-  return alg;
-}
-
-inline void sha256_hash(u8 *in, size_t len, u8 *out) {
-  BCryptHash(get_sha256_handle(), nullptr, 0, in, len, out, SHA256_SIZE);
-}
-
-class SHA256Hash {
-public:
-  SHA256Hash() {
-    BCryptCreateHash(get_sha256_handle(), &handle, nullptr, 0, nullptr, 0, 0);
-  }
-
-  void update(u8 *data, size_t len) {
-    BCryptHashData(handle, data, len, 0);
-  }
-
-  void finish(u8 *out) {
-    BCryptFinishHash(handle, out, SHA256_SIZE, 0);
-  }
-
-private:
-  BCRYPT_HASH_HANDLE handle;
-};
-
-#else
-// On Unix, we use OpenSSL or the Apple's OpenSSL-compatible API.
-
-#ifdef __APPLE__
-#  define COMMON_DIGEST_FOR_OPENSSL
-#  include <CommonCrypto/CommonDigest.h>
-#  define SHA256(data, len, md) CC_SHA256(data, len, md)
-#else
-#  define OPENSSL_SUPPRESS_DEPRECATED 1
-#  include <openssl/sha.h>
-#endif
-
-inline void sha256_hash(u8 *in, size_t len, u8 *out) {
-  SHA256(in, len, out);
-}
-
-class SHA256Hash {
-public:
-  SHA256Hash() {
-    SHA256_Init(&ctx);
-  }
-
-  void update(u8 *data, size_t len) {
-    SHA256_Update(&ctx, data, len);
-  }
-
-  void finish(u8 *out) {
-    SHA256_Final(out, &ctx);
-  }
-
-private:
-  SHA256_CTX ctx;
-};
-
-#endif

src/arch-arm32.cc

@@ -0,0 +1,916 @@
+// ARM32 is a bit special from the linker's viewpoint because ARM
+// processors support two different instruction encodings: Thumb and
+// ARM (in a narrower sense). Thumb instructions are either 16 bits or
+// 32 bits, while ARM instructions are all 32 bits. Feature-wise,
+// Thumb is a subset of ARM, so not all ARM instructions are
+// representable in Thumb.
+//
+// ARM processors originally supported only ARM instructions. Thumb
+// instructions were later added to increase code density.
+//
+// ARM processors runs in either ARM mode or Thumb mode. The mode can
+// be switched using BX (branch and mode exchange)-family instructions.
+// We need to use that instructions to, for example, call a function
+// encoded in Thumb from a function encoded in ARM. Sometimes, the
+// linker even has to emit interworking thunk code to switch mode.
+//
+// ARM instructions are aligned to 4 byte boundaries. Thumb are to 2
+// byte boundaries. So the least significant bit of a function address
+// is always 0.
+//
+// To distinguish Thumb functions from ARM fucntions, the LSB of a
+// function address is repurposed as a boolean flag. If the LSB is 0,
+// the function referred to by the address is encoded in ARM;
+// otherwise, Thumb.
+//
+// For example, if a symbol `foo` is of type STT_FUNC and has value
+// 0x2001, `foo` is a function using Thumb instructions whose address
+// is 0x2000 (not 0x2001, as Thumb instructions are always 2-byte
+// aligned). Likewise, if a function pointer has value 0x2001, it
+// refers a Thumb function at 0x2000.
+//
+// https://github.com/ARM-software/abi-aa/blob/main/aaelf32/aaelf32.rst
+
+#if MOLD_ARM32LE || MOLD_ARM32BE
+
+#include "mold.h"
+
+#include <tbb/parallel_for.h>
+#include <tbb/parallel_for_each.h>
+
+namespace mold {
+
+using E = MOLD_TARGET;
+
+template <>
+i64 get_addend(u8 *loc, const ElfRel<E> &rel) {
+  U32<E> *arm = (U32<E> *)loc;
+  U16<E> *thm = (U16<E> *)loc;
+
+  switch (rel.r_type) {
+  case R_ARM_ABS32:
+  case R_ARM_REL32:
+  case R_ARM_BASE_PREL:
+  case R_ARM_GOTOFF32:
+  case R_ARM_GOT_PREL:
+  case R_ARM_GOT_BREL:
+  case R_ARM_TLS_GD32:
+  case R_ARM_TLS_LDM32:
+  case R_ARM_TLS_LDO32:
+  case R_ARM_TLS_IE32:
+  case R_ARM_TLS_LE32:
+  case R_ARM_TLS_GOTDESC:
+  case R_ARM_TARGET1:
+  case R_ARM_TARGET2:
+    return (I32<E>)*arm;
+  case R_ARM_THM_JUMP8:
+    return sign_extend(thm[0], 8) << 1;
+  case R_ARM_THM_JUMP11:
+    return sign_extend(thm[0], 11) << 1;
+  case R_ARM_THM_JUMP19: {
+    // https://developer.arm.com/documentation/ddi0597/2024-12/Base-Instructions/B--Branch-
+    u32 S = bit(thm[0], 10);
+    u32 J2 = bit(thm[1], 11);
+    u32 J1 = bit(thm[1], 13);
+    u32 imm6 = bits(thm[0], 5, 0);
+    u32 imm11 = bits(thm[1], 10, 0);
+    u32 val = (S << 20) | (J2 << 19) | (J1 << 18) | (imm6 << 12) | (imm11 << 1);
+    return sign_extend(val, 21);
+  }
+  case R_ARM_THM_CALL:
+  case R_ARM_THM_JUMP24:
+  case R_ARM_THM_TLS_CALL: {
+    // https://developer.arm.com/documentation/ddi0597/2024-12/Base-Instructions/BL--BLX--immediate---Branch-with-Link-and-optional-Exchange--immediate--
+    u32 S = bit(thm[0], 10);
+    u32 J1 = bit(thm[1], 13);
+    u32 J2 = bit(thm[1], 11);
+    u32 I1 = !(J1 ^ S);
+    u32 I2 = !(J2 ^ S);
+    u32 imm10 = bits(thm[0], 9, 0);
+    u32 imm11 = bits(thm[1], 10, 0);
+    u32 val = (S << 24) | (I1 << 23) | (I2 << 22) | (imm10 << 12) | (imm11 << 1);
+    return sign_extend(val, 25);
+  }
+  case R_ARM_CALL:
+  case R_ARM_JUMP24:
+  case R_ARM_PLT32:
+  case R_ARM_TLS_CALL:
+    return sign_extend(*arm, 24) << 2;
+  case R_ARM_MOVW_PREL_NC:
+  case R_ARM_MOVW_ABS_NC:
+  case R_ARM_MOVT_PREL:
+  case R_ARM_MOVT_ABS: {
+    // https://developer.arm.com/documentation/ddi0597/2024-12/Base-Instructions/MOV--MOVS--immediate---Move--immediate--
+    u32 imm4 = bits(*arm, 19, 16);
+    u32 imm12 = bits(*arm, 11, 0);
+    u32 val = (imm4 << 12) | imm12;
+    return sign_extend(val, 16);
+  }
+  case R_ARM_PREL31:
+    return sign_extend(*arm, 31);
+  case R_ARM_THM_MOVW_PREL_NC:
+  case R_ARM_THM_MOVW_ABS_NC:
+  case R_ARM_THM_MOVT_PREL:
+  case R_ARM_THM_MOVT_ABS: {
+    // https://developer.arm.com/documentation/ddi0597/2024-12/Base-Instructions/MOVT--Move-Top-
+    u32 imm4 = bits(thm[0], 3, 0);
+    u32 i = bit(thm[0], 10);
+    u32 imm3 = bits(thm[1], 14, 12);
+    u32 imm8 = bits(thm[1], 7, 0);
+    u32 val = (imm4 << 12) | (i << 11) | (imm3 << 8) | imm8;
+    return sign_extend(val, 16);
+  }
+  default:
+    return 0;
+  }
+}
+
+static void write_arm_mov(u8 *loc, u32 val) {
+  u32 imm12 = bits(val, 11, 0);
+  u32 imm4 = bits(val, 15, 12);
+  *(U32<E> *)loc = (*(U32<E> *)loc & 0xfff0'f000) | (imm4 << 16) | imm12;
+}
+
+static void write_thm_b21(u8 *loc, u32 val) {
+  u32 S = bit(val, 20);
+  u32 J2 = bit(val, 19);
+  u32 J1 = bit(val, 18);
+  u32 imm6 = bits(val, 17, 12);
+  u32 imm11 = bits(val, 11, 1);
+
+  U16<E> *buf = (U16<E> *)loc;
+  buf[0] = (buf[0] & 0b1111'1011'1100'0000) | (S << 10) | imm6;
+  buf[1] = (buf[1] & 0b1101'0000'0000'0000) | (J1 << 13) | (J2 << 11) | imm11;
+}
+
+static void write_thm_b25(u8 *loc, u32 val) {
+  u32 S = bit(val, 24);
+  u32 I1 = bit(val, 23);
+  u32 I2 = bit(val, 22);
+  u32 J1 = !I1 ^ S;
+  u32 J2 = !I2 ^ S;
+  u32 imm10 = bits(val, 21, 12);
+  u32 imm11 = bits(val, 11, 1);
+
+  U16<E> *buf = (U16<E> *)loc;
+  buf[0] = (buf[0] & 0b1111'1000'0000'0000) | (S << 10) | imm10;
+  buf[1] = (buf[1] & 0b1101'0000'0000'0000) | (J1 << 13) | (J2 << 11) | imm11;
+}
+
+static void write_thm_mov(u8 *loc, u32 val) {
+  u32 imm4 = bits(val, 15, 12);
+  u32 i = bit(val, 11);
+  u32 imm3 = bits(val, 10, 8);
+  u32 imm8 = bits(val, 7, 0);
+
+  U16<E> *buf = (U16<E> *)loc;
+  buf[0] = (buf[0] & 0b1111'1011'1111'0000) | (i << 10) | imm4;
+  buf[1] = (buf[1] & 0b1000'1111'0000'0000) | (imm3 << 12) | imm8;
+}
+
+template <>
+void write_addend(u8 *loc, i64 val, const ElfRel<E> &rel) {
+  switch (rel.r_type) {
+  case R_ARM_NONE:
+    break;
+  case R_ARM_ABS32:
+  case R_ARM_REL32:
+  case R_ARM_BASE_PREL:
+  case R_ARM_GOTOFF32:
+  case R_ARM_GOT_PREL:
+  case R_ARM_GOT_BREL:
+  case R_ARM_TLS_GD32:
+  case R_ARM_TLS_LDM32:
+  case R_ARM_TLS_LDO32:
+  case R_ARM_TLS_IE32:
+  case R_ARM_TLS_LE32:
+  case R_ARM_TLS_GOTDESC:
+  case R_ARM_TARGET1:
+  case R_ARM_TARGET2:
+    *(U32<E> *)loc = val;
+    break;
+  case R_ARM_THM_JUMP8:
+    *(U16<E> *)loc = (*(U16<E> *)loc & 0xff00) | bits(val, 8, 1);
+    break;
+  case R_ARM_THM_JUMP11:
+    *(U16<E> *)loc = (*(U16<E> *)loc & 0xf800) | bits(val, 11, 1);
+    break;
+  case R_ARM_THM_CALL:
+  case R_ARM_THM_JUMP24:
+  case R_ARM_THM_TLS_CALL:
+    write_thm_b25(loc, val);
+    break;
+  case R_ARM_CALL:
+  case R_ARM_JUMP24:
+  case R_ARM_PLT32:
+    *(U32<E> *)loc = (*(U32<E> *)loc & 0xff00'0000) | bits(val, 25, 2);
+    break;
+  case R_ARM_MOVW_PREL_NC:
+  case R_ARM_MOVW_ABS_NC:
+  case R_ARM_MOVT_PREL:
+  case R_ARM_MOVT_ABS:
+    write_arm_mov(loc, val);
+    break;
+  case R_ARM_PREL31:
+    *(U32<E> *)loc = (*(U32<E> *)loc & 0x8000'0000) | (val & 0x7fff'ffff);
+    break;
+  case R_ARM_THM_MOVW_PREL_NC:
+  case R_ARM_THM_MOVW_ABS_NC:
+  case R_ARM_THM_MOVT_PREL:
+  case R_ARM_THM_MOVT_ABS:
+    write_thm_mov(loc, val);
+    break;
+  default:
+    unreachable();
+  }
+}
+
+template <>
+void write_plt_header(Context<E> &ctx, u8 *buf) {
+  constexpr ul32 insn[] = {
+    0xe52d'e004, //    push {lr}
+    0xe59f'e004, //    ldr lr, 2f
+    0xe08f'e00e, // 1: add lr, pc, lr
+    0xe5be'f008, //    ldr pc, [lr, #8]!
+    0x0000'0000, // 2: .word .got.plt - 1b - 8
+    0x0000'0000, //    (padding)
+    0x0000'0000, //    (padding)
+    0x0000'0000, //    (padding)
+  };
+
+  memcpy(buf, insn, sizeof(insn));
+  *(U32<E> *)(buf + 16) = ctx.gotplt->shdr.sh_addr - ctx.plt->shdr.sh_addr - 16;
+}
+
+static constexpr ul32 plt_entry[] = {
+  0xe59f'c004, // 1: ldr ip, 2f
+  0xe08c'c00f, //    add ip, ip, pc
+  0xe59c'f000, //    ldr pc, [ip]
+  0x0000'0000, // 2: .word sym@GOT - 1b
+};
+
+template <>
+void write_plt_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  memcpy(buf, plt_entry, sizeof(plt_entry));
+  *(U32<E> *)(buf + 12) = sym.get_gotplt_addr(ctx) - sym.get_plt_addr(ctx) - 12;
+}
+
+template <>
+void write_pltgot_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  memcpy(buf, plt_entry, sizeof(plt_entry));
+  *(U32<E> *)(buf + 12) = sym.get_got_pltgot_addr(ctx) - sym.get_plt_addr(ctx) - 12;
+}
+
+template <>
+void EhFrameSection<E>::apply_eh_reloc(Context<E> &ctx, const ElfRel<E> &rel,
+                                       u64 offset, u64 val) {
+  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
+
+  switch (rel.r_type) {
+  case R_NONE:
+    break;
+  case R_ARM_ABS32:
+    *(U32<E> *)loc = val;
+    break;
+  case R_ARM_REL32:
+    *(U32<E> *)loc = val - this->shdr.sh_addr - offset;
+    break;
+  default:
+    Fatal(ctx) << "unsupported relocation in .eh_frame: " << rel;
+  }
+}
+
+template <>
+void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || rel.r_type == R_ARM_V4BX)
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    u64 S = sym.get_addr(ctx);
+    u64 A = get_addend(*this, rel);
+    u64 P = get_addr() + rel.r_offset;
+    u64 T = S & 1;
+    u64 G = sym.get_got_idx(ctx) * sizeof(Word<E>);
+    u64 GOT = ctx.got->shdr.sh_addr;
+
+    auto check = [&](i64 val, i64 lo, i64 hi) {
+      check_range(ctx, i, val, lo, hi);
+    };
+
+    auto get_thumb_thunk_addr = [&] { return sym.get_thunk_addr(ctx, P); };
+    auto get_arm_thunk_addr   = [&] { return sym.get_thunk_addr(ctx, P) + 4; };
+
+    auto get_tlsdesc_trampoline_addr = [&] {
+      auto it = ranges::upper_bound(output_section->thunks, P, {},
+                                    [](std::unique_ptr<Thunk<E>> &thunk) {
+        return thunk->get_addr();
+      });
+      return (*it)->get_addr();
+    };
+
+    switch (rel.r_type) {
+    case R_ARM_ABS32:
+    case R_ARM_TARGET1:
+      break;
+    case R_ARM_REL32:
+      *(U32<E> *)loc = S + A - P;
+      break;
+    case R_ARM_THM_CALL: {
+      if (sym.is_remaining_undef_weak()) {
+        // On ARM, calling an weak undefined symbol jumps to the
+        // next instruction.
+        *(U32<E> *)loc = 0x8000'f3af; // NOP.W
+        break;
+      }
+
+      // THM_CALL relocation refers to either BL or BLX instruction.
+      // They are different in only one bit. We need to use BL if
+      // the jump target is Thumb. Otherwise, use BLX.
+      i64 val1 = S + A - P;
+      i64 val2 = align_to(S + A - P, 4);
+
+      if (T && is_int(val1, 25)) {
+        *(U16<E> *)(loc + 2) |= 0x1000;  // BL
+        write_thm_b25(loc, val1);
+      } else if (!T && is_int(val2, 25)) {
+        *(U16<E> *)(loc + 2) &= ~0x1000; // BLX
+        write_thm_b25(loc, val2);
+      } else {
+        *(U16<E> *)(loc + 2) |= 0x1000;  // BL
+        write_thm_b25(loc, get_thumb_thunk_addr() + A - P);
+      }
+      break;
+    }
+    case R_ARM_BASE_PREL:
+      *(U32<E> *)loc = GOT + A - P;
+      break;
+    case R_ARM_GOTOFF32:
+      *(U32<E> *)loc = ((S + A) | T) - GOT;
+      break;
+    case R_ARM_GOT_PREL:
+    case R_ARM_TARGET2:
+      *(U32<E> *)loc = GOT + G + A - P;
+      break;
+    case R_ARM_GOT_BREL:
+      *(U32<E> *)loc = G + A;
+      break;
+    case R_ARM_CALL: {
+      if (sym.is_remaining_undef_weak()) {
+        *(U32<E> *)loc = 0xe320'f000; // NOP
+        break;
+      }
+
+      // Just like THM_CALL, ARM_CALL relocation refers to either BL or
+      // BLX instruction. We may need to rewrite BL → BLX or BLX → BL.
+      bool is_bl = ((*(U32<E> *)loc & 0xff00'0000) == 0xeb00'0000);
+      bool is_blx = ((*(U32<E> *)loc & 0xfe00'0000) == 0xfa00'0000);
+      if (!is_bl && !is_blx)
+        Fatal(ctx) << *this << ": R_ARM_CALL refers to neither BL nor BLX";
+
+      i64 val = S + A - P;
+      if (is_int(val, 26)) {
+        if (T) {
+          *(U32<E> *)loc = 0xfa00'0000; // BLX
+          *(U32<E> *)loc |= (bit(val, 1) << 24) | bits(val, 25, 2);
+        } else {
+          *(U32<E> *)loc = 0xeb00'0000; // BL
+          *(U32<E> *)loc |= bits(val, 25, 2);
+        }
+      } else {
+        *(U32<E> *)loc = 0xeb00'0000; // BL
+        *(U32<E> *)loc |= bits(get_arm_thunk_addr() + A - P, 25, 2);
+      }
+      break;
+    }
+    case R_ARM_JUMP24: {
+      if (sym.is_remaining_undef_weak()) {
+        *(U32<E> *)loc = 0xe320'f000; // NOP
+        break;
+      }
+
+      // These relocs refers to a B (unconditional branch) instruction.
+      // Unlike BL or BLX, we can't rewrite B to BX in place when the
+      // processor mode switch is required because BX doesn't takes an
+      // immediate; it takes only a register. So if mode switch is
+      // required, we jump to a linker-synthesized thunk which does the
+      // job with a longer code sequence.
+      i64 val = S + A - P;
+      if (T || !is_int(val, 26))
+        val = get_arm_thunk_addr() + A - P;
+      *(U32<E> *)loc = (*(U32<E> *)loc & 0xff00'0000) | bits(val, 25, 2);
+      break;
+    }
+    case R_ARM_PLT32:
+      if (sym.is_remaining_undef_weak()) {
+        *(U32<E> *)loc = 0xe320'f000; // NOP
+      } else {
+        u64 val = (T ? get_arm_thunk_addr() : S) + A - P;
+        *(U32<E> *)loc = (*(U32<E> *)loc & 0xff00'0000) | bits(val, 25, 2);
+      }
+      break;
+    case R_ARM_THM_JUMP8:
+      check(S + A - P, -(1 << 8), 1 << 8);
+      *(U16<E> *)loc &= 0xff00;
+      *(U16<E> *)loc |= bits(S + A - P, 8, 1);
+      break;
+    case R_ARM_THM_JUMP11:
+      check(S + A - P, -(1 << 11), 1 << 11);
+      *(U16<E> *)loc &= 0xf800;
+      *(U16<E> *)loc |= bits(S + A - P, 11, 1);
+      break;
+    case R_ARM_THM_JUMP19:
+      check(S + A - P, -(1 << 20), 1 << 20);
+      write_thm_b21(loc, S + A - P);
+      break;
+    case R_ARM_THM_JUMP24: {
+      if (sym.is_remaining_undef_weak()) {
+        *(U32<E> *)loc = 0x8000'f3af; // NOP
+        break;
+      }
+
+      // Just like R_ARM_JUMP24, we need to jump to a thunk if we need to
+      // switch processor mode.
+      i64 val = S + A - P;
+      if (!T || !is_int(val, 25))
+        val = get_thumb_thunk_addr() + A - P;
+      write_thm_b25(loc, val);
+      break;
+    }
+    case R_ARM_MOVW_PREL_NC:
+      write_arm_mov(loc, ((S + A) | T) - P);
+      break;
+    case R_ARM_MOVW_ABS_NC:
+      write_arm_mov(loc, (S + A) | T);
+      break;
+    case R_ARM_THM_MOVW_PREL_NC:
+      write_thm_mov(loc, ((S + A) | T) - P);
+      break;
+    case R_ARM_PREL31:
+      check(S + A - P, -(1LL << 30), 1LL << 30);
+      *(U32<E> *)loc &= 0x8000'0000;
+      *(U32<E> *)loc |= (S + A - P) & 0x7fff'ffff;
+      break;
+    case R_ARM_THM_MOVW_ABS_NC:
+      write_thm_mov(loc, (S + A) | T);
+      break;
+    case R_ARM_MOVT_PREL:
+      write_arm_mov(loc, (S + A - P) >> 16);
+      break;
+    case R_ARM_THM_MOVT_PREL:
+      write_thm_mov(loc, (S + A - P) >> 16);
+      break;
+    case R_ARM_MOVT_ABS:
+      write_arm_mov(loc, (S + A) >> 16);
+      break;
+    case R_ARM_THM_MOVT_ABS:
+      write_thm_mov(loc, (S + A) >> 16);
+      break;
+    case R_ARM_TLS_GD32:
+      *(U32<E> *)loc = sym.get_tlsgd_addr(ctx) + A - P;
+      break;
+    case R_ARM_TLS_LDM32:
+      *(U32<E> *)loc = ctx.got->get_tlsld_addr(ctx) + A - P;
+      break;
+    case R_ARM_TLS_LDO32:
+      *(U32<E> *)loc = S + A - ctx.dtp_addr;
+      break;
+    case R_ARM_TLS_IE32:
+      *(U32<E> *)loc = sym.get_gottp_addr(ctx) + A - P;
+      break;
+    case R_ARM_TLS_LE32:
+      *(U32<E> *)loc = S + A - ctx.tp_addr;
+      break;
+    case R_ARM_TLS_GOTDESC:
+      // ARM32 TLSDESC uses the following code sequence to materialize
+      // a TP-relative address in r0.
+      //
+      //       ldr     r0, .L2
+      //  .L1: bl      foo
+      //           R_ARM_TLS_CALL
+      //  .L2: .word   foo + . - .L1
+      //           R_ARM_TLS_GOTDESC
+      //
+      // We may relax the instructions to the following if its TP-relative
+      // address is known at link-time
+      //
+      //       ldr     r0, .L2
+      //  .L1: nop
+      //       ...
+      //  .L2: .word   foo(tpoff)
+      //
+      // or to the following if the TP-relative address is known at
+      // process startup time.
+      //
+      //       ldr     r0, .L2
+      //  .L1: ldr r0, [pc, r0]
+      //       ...
+      //  .L2: .word   foo(gottpoff) + . - .L1
+      if (sym.has_tlsdesc(ctx)) {
+        // A is odd if the corresponding TLS_CALL is Thumb.
+        *(U32<E> *)loc = sym.get_tlsdesc_addr(ctx) - P + A - ((A & 1) ? 6 : 4);
+      } else if (sym.has_gottp(ctx)) {
+        *(U32<E> *)loc = sym.get_gottp_addr(ctx) - P + A - ((A & 1) ? 5 : 8);
+      } else {
+        *(U32<E> *)loc = S - ctx.tp_addr;
+      }
+      break;
+    case R_ARM_TLS_CALL:
+      if (sym.has_tlsdesc(ctx)) {
+        *(U32<E> *)loc = 0xeb00'0000; // bl 0
+        *(U32<E> *)loc |= bits(get_tlsdesc_trampoline_addr() - P - 8, 25, 2);
+      } else if (sym.has_gottp(ctx)) {
+        *(U32<E> *)loc = 0xe79f'0000; // ldr r0, [pc, r0]
+      } else {
+        *(U32<E> *)loc = 0xe320'f000; // nop
+      }
+      break;
+    case R_ARM_THM_TLS_CALL:
+      if (sym.has_tlsdesc(ctx)) {
+        u64 val = align_to(get_tlsdesc_trampoline_addr() - P - 4, 4);
+        write_thm_b25(loc, val);
+        *(U16<E> *)(loc + 2) &= ~0x1000; // rewrite BL with BLX
+      } else if (sym.has_gottp(ctx)) {
+        // Since `ldr r0, [pc, r0]` is not representable in Thumb,
+        // we use two instructions instead.
+        *(U16<E> *)loc = 0x4478;         // add r0, pc
+        *(U16<E> *)(loc + 2) = 0x6800;   // ldr r0, [r0]
+      } else {
+        *(U32<E> *)loc = 0x8000'f3af;    // nop.w
+      }
+      break;
+    default:
+      Error(ctx) << *this << ": unknown relocation: " << rel;
+    }
+  }
+}
+
+template <>
+void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    SectionFragment<E> *frag;
+    i64 frag_addend;
+    std::tie(frag, frag_addend) = get_fragment(ctx, rel);
+
+    u64 S = frag ? frag->get_addr(ctx) : sym.get_addr(ctx);
+    u64 A = frag ? frag_addend : get_addend(*this, rel);
+
+    switch (rel.r_type) {
+    case R_ARM_ABS32:
+      if (std::optional<u64> val = get_tombstone(sym, frag))
+        *(U32<E> *)loc = *val;
+      else
+        *(U32<E> *)loc = S + A;
+      break;
+    case R_ARM_TLS_LDO32:
+      if (std::optional<u64> val = get_tombstone(sym, frag))
+        *(U32<E> *)loc = *val;
+      else
+        *(U32<E> *)loc = S + A - ctx.dtp_addr;
+      break;
+    default:
+      Fatal(ctx) << *this << ": invalid relocation for non-allocated sections: "
+                 << rel;
+      break;
+    }
+  }
+}
+
+template <>
+void InputSection<E>::scan_relocations(Context<E> &ctx) {
+  assert(shdr().sh_flags & SHF_ALLOC);
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  // Scan relocations
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+
+    if (sym.is_ifunc())
+      sym.flags |= NEEDS_GOT | NEEDS_PLT;
+
+    switch (rel.r_type) {
+    case R_ARM_MOVW_ABS_NC:
+    case R_ARM_THM_MOVW_ABS_NC:
+      scan_absrel(ctx, sym, rel);
+      break;
+    case R_ARM_THM_CALL:
+    case R_ARM_CALL:
+    case R_ARM_JUMP24:
+    case R_ARM_PLT32:
+    case R_ARM_THM_JUMP24:
+      if (sym.is_imported)
+        sym.flags |= NEEDS_PLT;
+      break;
+    case R_ARM_GOT_PREL:
+    case R_ARM_GOT_BREL:
+    case R_ARM_TARGET2:
+      sym.flags |= NEEDS_GOT;
+      break;
+    case R_ARM_MOVT_PREL:
+    case R_ARM_THM_MOVT_PREL:
+    case R_ARM_PREL31:
+      scan_pcrel(ctx, sym, rel);
+      break;
+    case R_ARM_TLS_GD32:
+      sym.flags |= NEEDS_TLSGD;
+      break;
+    case R_ARM_TLS_LDM32:
+      ctx.needs_tlsld = true;
+      break;
+    case R_ARM_TLS_IE32:
+      sym.flags |= NEEDS_GOTTP;
+      break;
+    case R_ARM_TLS_CALL:
+    case R_ARM_THM_TLS_CALL:
+      scan_tlsdesc(ctx, sym);
+      break;
+    case R_ARM_TLS_LE32:
+      check_tlsle(ctx, sym, rel);
+      break;
+    case R_ARM_ABS32:
+    case R_ARM_TARGET1:
+    case R_ARM_MOVT_ABS:
+    case R_ARM_THM_MOVT_ABS:
+    case R_ARM_REL32:
+    case R_ARM_BASE_PREL:
+    case R_ARM_GOTOFF32:
+    case R_ARM_THM_JUMP8:
+    case R_ARM_THM_JUMP11:
+    case R_ARM_THM_JUMP19:
+    case R_ARM_MOVW_PREL_NC:
+    case R_ARM_THM_MOVW_PREL_NC:
+    case R_ARM_TLS_LDO32:
+    case R_ARM_V4BX:
+    case R_ARM_TLS_GOTDESC:
+      break;
+    default:
+      Error(ctx) << *this << ": unknown relocation: " << rel;
+    }
+  }
+}
+
+template <>
+void Thunk<E>::copy_buf(Context<E> &ctx) {
+  // TLS trampoline code. ARM32's TLSDESC is designed so that this
+  // common piece of code is factored out from object files to reduce
+  // output size. Since no one provide, the linker has to synthesize it.
+  constexpr ul32 hdr[] = {
+    0xe08e'0000, // add r0, lr, r0
+    0xe590'1004, // ldr r1, [r0, #4]
+    0xe12f'ff11, // bx  r1
+    0xe320'f000, // nop
+  };
+
+  // This is a range extension and mode switch thunk.
+  // It has two entry points: +0 for Thumb and +4 for ARM.
+  constexpr u8 entry[] = {
+    // .thumb
+    0x78, 0x47,             //    bx   pc  # jumps to 1f
+    0xc0, 0x46,             //    nop
+    // .arm
+    0x00, 0xc0, 0x9f, 0xe5, // 1: ldr  ip, 3f
+    0x0f, 0xf0, 0x8c, 0xe0, // 2: add  pc, ip, pc
+    0x00, 0x00, 0x00, 0x00, // 3: .word sym - 2b
+  };
+
+  static_assert(E::thunk_hdr_size == sizeof(hdr));
+  static_assert(E::thunk_size == sizeof(entry));
+
+  u8 *base = ctx.buf + output_section.shdr.sh_offset + offset;
+  memcpy(base, hdr, sizeof(hdr));
+
+  for (i64 i = 0; i < symbols.size(); i++) {
+    u64 S = symbols[i]->get_addr(ctx);
+    u64 P = get_addr() + offsets[i];
+    u8 *buf = base + offsets[i];
+    memcpy(buf, entry, sizeof(entry));
+    *(U32<E> *)(buf + 12) = S - P - 16;
+  }
+}
+
+template <>
+u64 get_eflags(Context<E> &ctx) {
+  if constexpr (E::is_le)
+    return EF_ARM_EABI_VER5;
+  else
+    return EF_ARM_EABI_VER5 | EF_ARM_BE8;
+}
+
+template <>
+void create_arm_exidx_section<E>(Context<E> &ctx) {
+  for (i64 i = 0; i < ctx.chunks.size(); i++) {
+    OutputSection<E> *osec = ctx.chunks[i]->to_osec();
+
+    if (osec && osec->shdr.sh_type == SHT_ARM_EXIDX) {
+      auto *sec = new Arm32ExidxSection(*osec);
+      ctx.extra.exidx = sec;
+      ctx.chunks[i] = sec;
+      ctx.chunk_pool.emplace_back(sec);
+
+      for (InputSection<E> *isec : osec->members)
+        isec->is_alive = false;
+      break;
+    }
+  }
+}
+
+template <>
+void Arm32ExidxSection<E>::compute_section_size(Context<E> &ctx) {
+  output_section.compute_section_size(ctx);
+  this->shdr.sh_size = output_section.shdr.sh_size + 8; // +8 for sentinel
+}
+
+template <>
+void Arm32ExidxSection<E>::update_shdr(Context<E> &ctx) {
+  // .ARM.exidx's sh_link should be set to the .text section index.
+  // Runtime doesn't care about it, but the binutils's strip command does.
+  if (Chunk<E> *chunk = find_chunk(ctx, ".text"))
+    this->shdr.sh_link = chunk->shndx;
+}
+
+// Returns the end of the text segment
+static u64 get_text_end(Context<E> &ctx) {
+  u64 ret = 0;
+  for (Chunk<E> *chunk : ctx.chunks)
+    if (chunk->shdr.sh_flags & SHF_EXECINSTR)
+      ret = std::max<u64>(ret, chunk->shdr.sh_addr + chunk->shdr.sh_size);
+  return ret;
+}
+
+// ARM executables use an .ARM.exidx section to look up an exception
+// handling record for the current instruction pointer. The table needs
+// to be sorted by their addresses.
+//
+// Other target uses .eh_frame_hdr instead for the same purpose.
+// I don't know why only ARM uses the different mechanism, but it's
+// likely that it's due to some historical reason.
+//
+// This function returns contents of .ARM.exidx.
+template <>
+std::vector<u8> Arm32ExidxSection<E>::get_contents(Context<E> &ctx) {
+  // .ARM.exidx records consists of a signed 31-bit relative address
+  // and a 32-bit value. The relative address indicates the start
+  // address of a function that the record covers. The value is one of
+  // the followings:
+  //
+  // 1. CANTUNWIND indicating that there's no unwinding info for the function,
+  // 2. a compact unwinding record encoded into a 32-bit value, or
+  // 3. a 31-bit relative address which points to a larger record in
+  //    the .ARM.extab section.
+  //
+  // CANTUNWIND is value 1. The most significant bit is set in (2) but
+  // not in (3). So we can distinguished them just by looking at a value.
+  const u32 CANTUNWIND = 1;
+
+  struct Entry {
+    U32<E> addr;
+    U32<E> val;
+  };
+
+  // We reserve one extra slot for the sentinel
+  i64 num_entries = output_section.shdr.sh_size / sizeof(Entry) + 1;
+  std::vector<u8> buf(num_entries * sizeof(Entry));
+  Entry *ent = (Entry *)buf.data();
+
+  // Write section contents to the buffer
+  output_section.shdr.sh_addr = this->shdr.sh_addr;
+  output_section.write_to(ctx, buf.data());
+
+  // Fill in sentinel fields
+  u64 sentinel_addr = this->shdr.sh_addr + sizeof(Entry) * (num_entries - 1);
+  ent[num_entries - 1].addr = get_text_end(ctx) - sentinel_addr;
+  ent[num_entries - 1].val = CANTUNWIND;
+
+  // Entry's addresses are relative to themselves. In order to sort
+  // records by address, we first translate them so that the addresses
+  // are relative to the beginning of the section.
+  auto is_relative = [](u32 val) {
+    return val != CANTUNWIND && !(val & 0x8000'0000);
+  };
+
+  tbb::parallel_for((i64)0, num_entries, [&](i64 i) {
+    i64 offset = sizeof(Entry) * i;
+    ent[i].addr = sign_extend(ent[i].addr, 31) + offset;
+    if (is_relative(ent[i].val))
+      ent[i].val = 0x7fff'ffff & (ent[i].val + offset);
+  });
+
+  ranges::sort(ent, ent + num_entries, {}, &Entry::addr);
+
+  // Remove duplicate adjacent entries. That is, if two adjacent functions
+  // have the same compact unwind info or are both CANTUNWIND, we can
+  // merge them into a single address range.
+  auto tail = ranges::unique(ent, ent + num_entries, {}, &Entry::val);
+  num_entries -= tail.size();
+  buf.resize(num_entries * sizeof(Entry));
+
+  // Make addresses relative to themselves.
+  tbb::parallel_for((i64)0, num_entries, [&](i64 i) {
+    i64 offset = sizeof(Entry) * i;
+    ent[i].addr = 0x7fff'ffff & (ent[i].addr - offset);
+    if (is_relative(ent[i].val))
+      ent[i].val = 0x7fff'ffff & (ent[i].val - offset);
+  });
+
+  return buf;
+}
+
+template <>
+void Arm32ExidxSection<E>::remove_duplicate_entries(Context<E> &ctx) {
+  this->shdr.sh_size = get_contents(ctx).size();
+}
+
+template <>
+void Arm32ExidxSection<E>::copy_buf(Context<E> &ctx) {
+  std::vector<u8> contents = get_contents(ctx);
+  assert(this->shdr.sh_size == contents.size());
+  write_vector(ctx.buf + this->shdr.sh_offset, contents);
+}
+
+// Even though using ARM32 in big-endian mode is very rare, the processor
+// technically supports both little- and big-endian modes. There are two
+// variants of big-endian mode: BE32 and BE8. In BE32, instructions and
+// data are encoded in big-endian. In BE8, instructions are encoded in
+// little-endian, and only data is in big-endian. BE8 is the de facto
+// standard for ARMv6 or later. We support only BE8.
+//
+// A tricky thing is that instructions in an object file are always
+// big-endian if the file is compiled for big-endian mode. In other words,
+// the compiler always emit code in BE32 if -mbig-endian is specified. It
+// is the linker's responsibility to rewrite instructions from big-endian
+// to little-endian for an BE8 output. This function does that.
+//
+// The text section may contain a mix of 32-bit ARM instructions, 16-bit
+// Thumb instructions, and data. We need to distinguish them to swap 4
+// bytes, 2 bytes, or not swap bytes, respectively. The beginning of ARM
+// code, Thumb code, and data is labeled with a mapping symbol of $a, $t,
+// and $d, respectively. We use mapping symbols to determine what to do
+// with the text section.
+//
+// This function is called after we copy the input section contents to the
+// output file. We rewrite instructions in the output buffer in place.
+#if MOLD_ARM32BE
+void arm32be_swap_bytes(Context<E> &ctx) {
+  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
+    // Collect mapping symbols
+    std::vector<Symbol<E> *> syms;
+
+    for (Symbol<E> *sym : file->get_local_syms())
+      if (InputSection<E> *isec = sym->get_input_section())
+        if (isec->is_alive && (isec->shdr().sh_flags & SHF_EXECINSTR))
+          if (std::string_view x = sym->name();
+              x == "$a" || x.starts_with("$a.") ||
+              x == "$t" || x.starts_with("$t.") ||
+              x == "$d" || x.starts_with("$d."))
+            syms.push_back(sym);
+
+    // Group mapping symbols by input section and sort by address
+    ranges::stable_sort(syms, {}, [](const Symbol<E> *sym) {
+      return std::tuple{(uintptr_t)sym->get_input_section(), sym->value};
+    });
+
+    // Swap bytes
+    for (i64 i = 0; i < syms.size(); i++) {
+      Symbol<E> &sym = *syms[i];
+      if (sym.name().starts_with("$d"))
+        continue;
+
+      InputSection<E> &isec = *sym.get_input_section();
+      u8 *base = ctx.buf + isec.output_section->shdr.sh_offset + isec.offset;
+      u8 *start = base + sym.value;
+      u8 *end;
+
+      if (i + 1 < syms.size() && syms[i + 1]->get_input_section() == &isec)
+        end = base + syms[i + 1]->value;
+      else
+        end = base + isec.sh_size;
+
+      i64 sz = sym.name().starts_with("$a") ? 4 : 2;
+      for (u8 *p = start; p < end; p += sz)
+        std::reverse(p, p + sz);
+    }
+  });
+}
+#endif
+
+} // namespace mold
+
+#endif

src/arch-arm64.cc

@@ -0,0 +1,703 @@
+// This file contains ARM64-specific code. Being new, the ARM64's ELF
+// psABI doesn't have anything peculiar. ARM64 is a clean RISC
+// instruction set that supports PC-relative load/store instructions.
+//
+// Unlike ARM32, instructions length doesn't vary. All ARM64
+// instructions are 4 bytes long.
+//
+// Branch instructions used for function call can jump within ±128 MiB.
+// We need to create range extension thunks to support binaries whose
+// .text is larger than that.
+//
+// Unlike most other targets, the TLSDESC access model is used by default
+// for -fPIC to access thread-local variables instead of the less
+// efficient GD model. You can still enable GD but it needs the
+// -mtls-dialect=trad flag. Since GD is used rarely, we don't need to
+// implement GD → LE relaxation.
+//
+// https://github.com/ARM-software/abi-aa/blob/main/aaelf64/aaelf64.rst
+
+#if MOLD_ARM64LE || MOLD_ARM64BE
+
+#include "mold.h"
+
+namespace mold {
+
+using E = MOLD_TARGET;
+
+static void write_adrp(u8 *buf, u64 val) {
+  *(ul32 *)buf |= (bits(val, 13, 12) << 29) | (bits(val, 32, 14) << 5);
+}
+
+static void write_adr(u8 *buf, u64 val) {
+  *(ul32 *)buf |= (bits(val, 1, 0) << 29) | (bits(val, 20, 2) << 5);
+}
+
+static void write_movn_movz(u8 *buf, i64 val) {
+  *(ul32 *)buf &= 0b0000'0000'0110'0000'0000'0000'0001'1111;
+
+  if (val >= 0)
+    *(ul32 *)buf |= 0xd280'0000 | (bits(val, 15, 0) << 5);  // rewrite to movz
+  else
+    *(ul32 *)buf |= 0x9280'0000 | (bits(~val, 15, 0) << 5); // rewrite to movn
+}
+
+static u64 page(u64 val) {
+  return val & 0xffff'ffff'ffff'f000;
+}
+
+template <>
+void write_plt_header(Context<E> &ctx, u8 *buf) {
+  constexpr ul32 insn[] = {
+    0xa9bf'7bf0, // stp  x16, x30, [sp,#-16]!
+    0x9000'0010, // adrp x16, .got.plt[2]
+    0xf940'0211, // ldr  x17, [x16, .got.plt[2]]
+    0x9100'0210, // add  x16, x16, .got.plt[2]
+    0xd61f'0220, // br   x17
+    0xd420'7d00, // brk
+    0xd420'7d00, // brk
+    0xd420'7d00, // brk
+ };
+
+  u64 gotplt = ctx.gotplt->shdr.sh_addr + 16;
+  u64 plt = ctx.plt->shdr.sh_addr;
+
+  memcpy(buf, insn, sizeof(insn));
+  write_adrp(buf + 4, page(gotplt) - page(plt + 4));
+  *(ul32 *)(buf + 8) |= bits(gotplt, 11, 3) << 10;
+  *(ul32 *)(buf + 12) |= (gotplt & 0xfff) << 10;
+}
+
+template <>
+void write_plt_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  constexpr ul32 insn[] = {
+    0x9000'0010, // adrp x16, .got.plt[n]
+    0xf940'0211, // ldr  x17, [x16, .got.plt[n]]
+    0x9100'0210, // add  x16, x16, .got.plt[n]
+    0xd61f'0220, // br   x17
+  };
+
+  u64 gotplt = sym.get_gotplt_addr(ctx);
+  u64 plt = sym.get_plt_addr(ctx);
+
+  memcpy(buf, insn, sizeof(insn));
+  write_adrp(buf, page(gotplt) - page(plt));
+  *(ul32 *)(buf + 4) |= bits(gotplt, 11, 3) << 10;
+  *(ul32 *)(buf + 8) |= (gotplt & 0xfff) << 10;
+}
+
+template <>
+void write_pltgot_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  constexpr ul32 insn[] = {
+    0x9000'0010, // adrp x16, GOT[n]
+    0xf940'0211, // ldr  x17, [x16, GOT[n]]
+    0xd61f'0220, // br   x17
+    0xd420'7d00, // brk
+  };
+
+  u64 got = sym.get_got_pltgot_addr(ctx);
+  u64 plt = sym.get_plt_addr(ctx);
+
+  memcpy(buf, insn, sizeof(insn));
+  write_adrp(buf, page(got) - page(plt));
+  *(ul32 *)(buf + 4) |= bits(got, 11, 3) << 10;
+}
+
+template <>
+void EhFrameSection<E>::apply_eh_reloc(Context<E> &ctx, const ElfRel<E> &rel,
+                                       u64 offset, u64 val) {
+  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
+
+  switch (rel.r_type) {
+  case R_NONE:
+    break;
+  case R_AARCH64_ABS64:
+    *(U64<E> *)loc = val;
+    break;
+  case R_AARCH64_PREL32:
+    *(U32<E> *)loc = val - this->shdr.sh_addr - offset;
+    break;
+  case R_AARCH64_PREL64:
+    *(U64<E> *)loc = val - this->shdr.sh_addr - offset;
+    break;
+  default:
+    Fatal(ctx) << "unsupported relocation in .eh_frame: " << rel;
+  }
+}
+
+static bool is_adrp(u8 *loc) {
+  // https://developer.arm.com/documentation/ddi0596/2021-12/Base-Instructions/ADRP--Form-PC-relative-address-to-4KB-page-
+  u32 insn = *(ul32 *)loc;
+  return (bits(insn, 31, 24) & 0b1001'1111) == 0b1001'0000;
+}
+
+static bool is_ldr(u8 *loc) {
+  // https://developer.arm.com/documentation/ddi0596/2021-12/Base-Instructions/LDR--immediate---Load-Register--immediate--
+  u32 insn = *(ul32 *)loc;
+  return (bits(insn, 31, 20) & 0b1111'1111'1100) == 0b1111'1001'0100;
+}
+
+static bool is_add(u8 *loc) {
+  // https://developer.arm.com/documentation/ddi0596/2021-12/Base-Instructions/ADD--immediate---Add--immediate--
+  u32 insn = *(ul32 *)loc;
+  return (bits(insn, 31, 20) & 0b1111'1111'1100) == 0b1001'0001'0000;
+}
+
+template <>
+void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE)
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    u64 S = sym.get_addr(ctx);
+    u64 A = rel.r_addend;
+    u64 P = get_addr() + rel.r_offset;
+    u64 G = sym.get_got_idx(ctx) * sizeof(Word<E>);
+    u64 GOT = ctx.got->shdr.sh_addr;
+
+    auto check = [&](i64 val, i64 lo, i64 hi) {
+      check_range(ctx, i, val, lo, hi);
+    };
+
+    switch (rel.r_type) {
+    case R_AARCH64_ABS64:
+      break;
+    case R_AARCH64_LDST8_ABS_LO12_NC:
+    case R_AARCH64_ADD_ABS_LO12_NC:
+      *(ul32 *)loc |= bits(S + A, 11, 0) << 10;
+      break;
+    case R_AARCH64_LDST16_ABS_LO12_NC:
+      *(ul32 *)loc |= bits(S + A, 11, 1) << 10;
+      break;
+    case R_AARCH64_LDST32_ABS_LO12_NC:
+      *(ul32 *)loc |= bits(S + A, 11, 2) << 10;
+      break;
+    case R_AARCH64_LDST64_ABS_LO12_NC:
+      *(ul32 *)loc |= bits(S + A, 11, 3) << 10;
+      break;
+    case R_AARCH64_LDST128_ABS_LO12_NC:
+      *(ul32 *)loc |= bits(S + A, 11, 4) << 10;
+      break;
+    case R_AARCH64_MOVW_UABS_G0:
+      check(S + A, 0, 1 << 16);
+      *(ul32 *)loc |= bits(S + A, 15, 0) << 5;
+      break;
+    case R_AARCH64_MOVW_UABS_G0_NC:
+      *(ul32 *)loc |= bits(S + A, 15, 0) << 5;
+      break;
+    case R_AARCH64_MOVW_UABS_G1:
+      check(S + A, 0, 1LL << 32);
+      *(ul32 *)loc |= bits(S + A, 31, 16) << 5;
+      break;
+    case R_AARCH64_MOVW_UABS_G1_NC:
+      *(ul32 *)loc |= bits(S + A, 31, 16) << 5;
+      break;
+    case R_AARCH64_MOVW_UABS_G2:
+      check(S + A, 0, 1LL << 48);
+      *(ul32 *)loc |= bits(S + A, 47, 32) << 5;
+      break;
+    case R_AARCH64_MOVW_UABS_G2_NC:
+      *(ul32 *)loc |= bits(S + A, 47, 32) << 5;
+      break;
+    case R_AARCH64_MOVW_UABS_G3:
+      *(ul32 *)loc |= bits(S + A, 63, 48) << 5;
+      break;
+    case R_AARCH64_MOVW_PREL_G0:
+      check(S + A - P, -(1 << 15), 1 << 15);
+      write_movn_movz(loc, S + A - P);
+      break;
+    case R_AARCH64_MOVW_PREL_G0_NC:
+      *(ul32 *)loc |= bits(S + A - P, 15, 0) << 5;
+      break;
+    case R_AARCH64_MOVW_PREL_G1:
+      check(S + A - P, -(1LL << 31), 1LL << 31);
+      write_movn_movz(loc, (i64)(S + A - P) >> 16);
+      break;
+    case R_AARCH64_MOVW_PREL_G1_NC:
+      *(ul32 *)loc |= bits(S + A - P, 31, 16) << 5;
+      break;
+    case R_AARCH64_MOVW_PREL_G2:
+      check(S + A - P, -(1LL << 47), 1LL << 47);
+      write_movn_movz(loc, (i64)(S + A - P) >> 32);
+      break;
+    case R_AARCH64_MOVW_PREL_G2_NC:
+      *(ul32 *)loc |= bits(S + A - P, 47, 32) << 5;
+      break;
+    case R_AARCH64_MOVW_PREL_G3:
+      *(ul32 *)loc |= bits(S + A - P, 63, 48) << 5;
+      break;
+    case R_AARCH64_ADR_GOT_PAGE:
+      if (sym.has_got(ctx)) {
+        i64 val = page(G + GOT + A) - page(P);
+        check(val, -(1LL << 32), 1LL << 32);
+        write_adrp(loc, val);
+      } else {
+        // Relax GOT-loading ADRP+LDR to an immediate ADRP+ADD
+        i64 val = page(S + A) - page(P);
+        check(val, -(1LL << 32), 1LL << 32);
+        write_adrp(loc, val);
+
+        u32 reg = bits(*(ul32 *)loc, 4, 0);
+        *(ul32 *)(loc + 4) = 0x9100'0000 | (reg << 5) | reg; // ADD
+        *(ul32 *)(loc + 4) |= bits(S + A, 11, 0) << 10;
+        i++;
+      }
+      break;
+    case R_AARCH64_ADR_PREL_PG_HI21:
+    case R_AARCH64_ADR_PREL_PG_HI21_NC: {
+      // The ARM64 psABI defines that an `ADRP x0, foo` and `ADD x0, x0,
+      // :lo12: foo` instruction pair to materialize a PC-relative address
+      // in a register can be relaxed to `NOP` followed by `ADR x0, foo`
+      // if foo is in PC ± 1 MiB.
+      if (ctx.arg.relax && sym.is_pcrel_linktime_const(ctx) &&
+          i + 1 < rels.size()) {
+        i64 val = S + A - P - 4;
+        const ElfRel<E> &rel2 = rels[i + 1];
+        if (is_int(val, 21) &&
+            rel2.r_type == R_AARCH64_ADD_ABS_LO12_NC &&
+            rel2.r_sym == rel.r_sym &&
+            rel2.r_offset == rel.r_offset + 4 &&
+            rel2.r_addend == rel.r_addend &&
+            is_adrp(loc) &&
+            is_add(loc + 4)) {
+          u32 reg1 = bits(*(ul32 *)loc, 4, 0);
+          u32 reg2 = bits(*(ul32 *)(loc + 4), 4, 0);
+          if (reg1 == reg2) {
+            *(ul32 *)loc = 0xd503'201f;              // nop
+            *(ul32 *)(loc + 4) = 0x1000'0000 | reg1; // adr
+            write_adr(loc + 4, val);
+            i++;
+            break;
+          }
+        }
+      }
+
+      i64 val = page(S + A) - page(P);
+      if (rel.r_type == R_AARCH64_ADR_PREL_PG_HI21)
+        check(val, -(1LL << 32), 1LL << 32);
+      write_adrp(loc, val);
+      break;
+    }
+    case R_AARCH64_ADR_PREL_LO21:
+      check(S + A - P, -(1LL << 20), 1LL << 20);
+      write_adr(loc, S + A - P);
+      break;
+    case R_AARCH64_CALL26:
+    case R_AARCH64_JUMP26: {
+      if (sym.is_remaining_undef_weak()) {
+        // On ARM, calling an weak undefined symbol jumps to the
+        // next instruction.
+        *(ul32 *)loc = 0xd503'201f; // nop
+        break;
+      }
+
+      i64 val = S + A - P;
+      if (!is_int(val, 28))
+        val = sym.get_thunk_addr(ctx, P) + A - P;
+      *(ul32 *)loc |= bits(val, 27, 2);
+      break;
+    }
+    case R_AARCH64_PLT32:
+      check(S + A - P, -(1LL << 31), 1LL << 31);
+      *(U32<E> *)loc = S + A - P;
+      break;
+    case R_AARCH64_GOTPCREL32:
+      check(G + GOT + A - P, -(1LL << 31), 1LL << 31);
+      *(U32<E> *)loc = G + GOT + A - P;
+      break;
+    case R_AARCH64_CONDBR19:
+    case R_AARCH64_LD_PREL_LO19:
+      check(S + A - P, -(1LL << 20), 1LL << 20);
+      *(ul32 *)loc |= bits(S + A - P, 20, 2) << 5;
+      break;
+    case R_AARCH64_PREL16:
+      check(S + A - P, -(1LL << 15), 1LL << 16);
+      *(U16<E> *)loc = S + A - P;
+      break;
+    case R_AARCH64_PREL32:
+      check(S + A - P, -(1LL << 31), 1LL << 32);
+      *(U32<E> *)loc = S + A - P;
+      break;
+    case R_AARCH64_PREL64:
+      *(U64<E> *)loc = S + A - P;
+      break;
+    case R_AARCH64_LD64_GOT_LO12_NC:
+      *(ul32 *)loc |= bits(G + GOT + A, 11, 3) << 10;
+      break;
+    case R_AARCH64_LD64_GOTPAGE_LO15: {
+      i64 val = G + GOT + A - page(GOT);
+      check(val, 0, 1 << 15);
+      *(ul32 *)loc |= bits(val, 14, 3) << 10;
+      break;
+    }
+    case R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: {
+      i64 val = page(sym.get_gottp_addr(ctx) + A) - page(P);
+      check(val, -(1LL << 32), 1LL << 32);
+      write_adrp(loc, val);
+      break;
+    }
+    case R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
+      *(ul32 *)loc |= bits(sym.get_gottp_addr(ctx) + A, 11, 3) << 10;
+      break;
+    case R_AARCH64_TLSLE_MOVW_TPREL_G0: {
+      i64 val = S + A - ctx.tp_addr;
+      check(val, -(1 << 15), 1 << 15);
+      write_movn_movz(loc, val);
+      break;
+    }
+    case R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
+      *(ul32 *)loc |= bits(S + A - ctx.tp_addr, 15, 0) << 5;
+      break;
+    case R_AARCH64_TLSLE_MOVW_TPREL_G1: {
+      i64 val = S + A - ctx.tp_addr;
+      check(val, -(1LL << 31), 1LL << 31);
+      write_movn_movz(loc, val >> 16);
+      break;
+    }
+    case R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
+      *(ul32 *)loc |= bits(S + A - ctx.tp_addr, 31, 16) << 5;
+      break;
+    case R_AARCH64_TLSLE_MOVW_TPREL_G2: {
+      i64 val = S + A - ctx.tp_addr;
+      check(val, -(1LL << 47), 1LL << 47);
+      write_movn_movz(loc, val >> 32);
+      break;
+    }
+    case R_AARCH64_TLSLE_ADD_TPREL_HI12: {
+      i64 val = S + A - ctx.tp_addr;
+      check(val, 0, 1LL << 24);
+      *(ul32 *)loc |= bits(val, 23, 12) << 10;
+      break;
+    }
+    case R_AARCH64_TLSLE_ADD_TPREL_LO12:
+      check(S + A - ctx.tp_addr, 0, 1 << 12);
+      *(ul32 *)loc |= bits(S + A - ctx.tp_addr, 11, 0) << 10;
+      break;
+    case R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
+      *(ul32 *)loc |= bits(S + A - ctx.tp_addr, 11, 0) << 10;
+      break;
+    case R_AARCH64_TLSGD_ADR_PAGE21: {
+      i64 val = page(sym.get_tlsgd_addr(ctx) + A) - page(P);
+      check(val, -(1LL << 32), 1LL << 32);
+      write_adrp(loc, val);
+      break;
+    }
+    case R_AARCH64_TLSGD_ADD_LO12_NC:
+      *(ul32 *)loc |= bits(sym.get_tlsgd_addr(ctx) + A, 11, 0) << 10;
+      break;
+    case R_AARCH64_TLSDESC_ADR_PAGE21:
+      // ARM64 TLSDESC uses the following code sequence to materialize
+      // a TP-relative address in x0.
+      //
+      //   adrp    x0, 0
+      //       R_AARCH64_TLSDESC_ADR_PAGE21 foo
+      //   ldr     x1, [x0]
+      //       R_AARCH64_TLSDESC_LD64_LO12  foo
+      //   add     x0, x0, #0
+      //       R_AARCH64_TLSDESC_ADD_LO12   foo
+      //   blr     x1
+      //       R_AARCH64_TLSDESC_CALL       foo
+      //
+      // We may relax the instructions to the following if its TP-relative
+      // address is known at link-time
+      //
+      //   nop
+      //   nop
+      //   movz    x0, :tls_offset_hi:foo, lsl #16
+      //   movk    x0, :tls_offset_lo:foo
+      //
+      // or to the following if the TP-relative address is known at
+      // process startup time.
+      //
+      //   nop
+      //   nop
+      //   adrp    x0, :gottprel:foo
+      //   ldr     x0, [x0, :gottprel_lo12:foo]
+      if (sym.has_tlsdesc(ctx)) {
+        i64 val = page(sym.get_tlsdesc_addr(ctx) + A) - page(P);
+        check(val, -(1LL << 32), 1LL << 32);
+        write_adrp(loc, val);
+      } else {
+        *(ul32 *)loc = 0xd503'201f; // nop
+      }
+      break;
+    case R_AARCH64_TLSDESC_LD64_LO12:
+      if (sym.has_tlsdesc(ctx))
+        *(ul32 *)loc |= bits(sym.get_tlsdesc_addr(ctx) + A, 11, 3) << 10;
+      else
+        *(ul32 *)loc = 0xd503'201f; // nop
+      break;
+    case R_AARCH64_TLSDESC_ADD_LO12:
+      if (sym.has_tlsdesc(ctx)) {
+        *(ul32 *)loc |= bits(sym.get_tlsdesc_addr(ctx) + A, 11, 0) << 10;
+      } else if (sym.has_gottp(ctx)) {
+        *(ul32 *)loc = 0x9000'0000; // adrp x0, 0
+        write_adrp(loc, page(sym.get_gottp_addr(ctx) + A) - page(P));
+      } else {
+        *(ul32 *)loc = 0xd2a0'0000; // movz x0, 0, lsl #16
+        *(ul32 *)loc |= bits(S + A - ctx.tp_addr, 32, 16) << 5;
+      }
+      break;
+    case R_AARCH64_TLSDESC_CALL:
+      if (sym.has_tlsdesc(ctx)) {
+        // Do nothing
+      } else if (sym.has_gottp(ctx)) {
+        *(ul32 *)loc = 0xf940'0000; // ldr x0, [x0, 0]
+        *(ul32 *)loc |= bits(sym.get_gottp_addr(ctx) + A, 11, 3) << 10;
+      } else {
+        *(ul32 *)loc = 0xf280'0000; // movk x0, 0
+        *(ul32 *)loc |= bits(S + A - ctx.tp_addr, 15, 0) << 5;
+      }
+      break;
+    default:
+      unreachable();
+    }
+  }
+}
+
+template <>
+void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    SectionFragment<E> *frag;
+    i64 frag_addend;
+    std::tie(frag, frag_addend) = get_fragment(ctx, rel);
+
+    u64 S = frag ? frag->get_addr(ctx) : sym.get_addr(ctx);
+    u64 A = frag ? frag_addend : (i64)rel.r_addend;
+
+    auto check = [&](i64 val, i64 lo, i64 hi) {
+      check_range(ctx, val, i, lo, hi);
+    };
+
+    switch (rel.r_type) {
+    case R_AARCH64_ABS64:
+      if (std::optional<u64> val = get_tombstone(sym, frag))
+        *(U64<E> *)loc = *val;
+      else
+        *(U64<E> *)loc = S + A;
+      break;
+    case R_AARCH64_ABS32:
+      check(S + A, 0, 1LL << 32);
+      *(U32<E> *)loc = S + A;
+      break;
+    default:
+      Fatal(ctx) << *this << ": invalid relocation for non-allocated sections: "
+                 << rel;
+      break;
+    }
+  }
+}
+
+template <>
+void InputSection<E>::scan_relocations(Context<E> &ctx) {
+  assert(shdr().sh_flags & SHF_ALLOC);
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  // Scan relocations
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = (u8 *)(contents.data() + rel.r_offset);
+
+    if (sym.is_ifunc())
+      sym.flags |= NEEDS_GOT | NEEDS_PLT;
+
+    switch (rel.r_type) {
+    case R_AARCH64_MOVW_UABS_G3:
+      scan_absrel(ctx, sym, rel);
+      break;
+    case R_AARCH64_ADR_GOT_PAGE:
+      // An ADR_GOT_PAGE and GOT_LO12_NC relocation pair is used to load a
+      // symbol's address from GOT. If the GOT value is a link-time
+      // constant, we may be able to rewrite the ADRP+LDR instruction pair
+      // with an ADRP+ADD, eliminating a GOT memory load.
+      if (ctx.arg.relax && sym.is_pcrel_linktime_const(ctx) &&
+          i + 1 < rels.size()) {
+        // ADRP+LDR must be consecutive and use the same register to relax.
+        const ElfRel<E> &rel2 = rels[i + 1];
+        if (rel2.r_type == R_AARCH64_LD64_GOT_LO12_NC &&
+            rel2.r_offset == rel.r_offset + 4 &&
+            rel2.r_sym == rel.r_sym &&
+            rel.r_addend == 0 &&
+            rel2.r_addend == 0 &&
+            is_adrp(loc) &&
+            is_ldr(loc + 4)) {
+          u32 rd = bits(*(ul32 *)loc, 4, 0);
+          u32 rn = bits(*(ul32 *)(loc + 4), 9, 5);
+          u32 rt = bits(*(ul32 *)(loc + 4), 4, 0);
+          if (rd == rn && rn == rt) {
+            i++;
+            break;
+          }
+        }
+      }
+      sym.flags |= NEEDS_GOT;
+      break;
+    case R_AARCH64_LD64_GOT_LO12_NC:
+    case R_AARCH64_LD64_GOTPAGE_LO15:
+    case R_AARCH64_GOTPCREL32:
+      sym.flags |= NEEDS_GOT;
+      break;
+    case R_AARCH64_CALL26:
+    case R_AARCH64_JUMP26:
+    case R_AARCH64_PLT32:
+      if (sym.is_imported)
+        sym.flags |= NEEDS_PLT;
+      break;
+    case R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
+    case R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
+      sym.flags |= NEEDS_GOTTP;
+      break;
+    case R_AARCH64_ADR_PREL_PG_HI21:
+    case R_AARCH64_ADR_PREL_PG_HI21_NC:
+      scan_pcrel(ctx, sym, rel);
+      break;
+    case R_AARCH64_TLSGD_ADR_PAGE21:
+      sym.flags |= NEEDS_TLSGD;
+      break;
+    case R_AARCH64_TLSDESC_CALL:
+      scan_tlsdesc(ctx, sym);
+      break;
+    case R_AARCH64_TLSLE_MOVW_TPREL_G2:
+    case R_AARCH64_TLSLE_ADD_TPREL_LO12:
+    case R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
+      check_tlsle(ctx, sym, rel);
+      break;
+    case R_AARCH64_ABS64:
+    case R_AARCH64_ADD_ABS_LO12_NC:
+    case R_AARCH64_ADR_PREL_LO21:
+    case R_AARCH64_CONDBR19:
+    case R_AARCH64_LD_PREL_LO19:
+    case R_AARCH64_LDST16_ABS_LO12_NC:
+    case R_AARCH64_LDST32_ABS_LO12_NC:
+    case R_AARCH64_LDST64_ABS_LO12_NC:
+    case R_AARCH64_LDST128_ABS_LO12_NC:
+    case R_AARCH64_LDST8_ABS_LO12_NC:
+    case R_AARCH64_MOVW_UABS_G0:
+    case R_AARCH64_MOVW_UABS_G0_NC:
+    case R_AARCH64_MOVW_UABS_G1:
+    case R_AARCH64_MOVW_UABS_G1_NC:
+    case R_AARCH64_MOVW_UABS_G2:
+    case R_AARCH64_MOVW_UABS_G2_NC:
+    case R_AARCH64_MOVW_PREL_G0:
+    case R_AARCH64_MOVW_PREL_G0_NC:
+    case R_AARCH64_MOVW_PREL_G1:
+    case R_AARCH64_MOVW_PREL_G1_NC:
+    case R_AARCH64_MOVW_PREL_G2:
+    case R_AARCH64_MOVW_PREL_G2_NC:
+    case R_AARCH64_MOVW_PREL_G3:
+    case R_AARCH64_PREL16:
+    case R_AARCH64_PREL32:
+    case R_AARCH64_PREL64:
+    case R_AARCH64_TLSGD_ADD_LO12_NC:
+    case R_AARCH64_TLSLE_MOVW_TPREL_G0:
+    case R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
+    case R_AARCH64_TLSLE_MOVW_TPREL_G1:
+    case R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
+    case R_AARCH64_TLSLE_ADD_TPREL_HI12:
+    case R_AARCH64_TLSDESC_ADR_PAGE21:
+    case R_AARCH64_TLSDESC_LD64_LO12:
+    case R_AARCH64_TLSDESC_ADD_LO12:
+      break;
+    default:
+      Error(ctx) << *this << ": unknown relocation: " << rel;
+    }
+  }
+}
+
+// The size of a thunk entry varies on ARM64 depending on the distance to
+// the branch target. This function computes the size of each thunk entry.
+template <>
+void Thunk<E>::shrink_size(Context<E> &ctx) {
+  offsets.clear();
+  offsets.push_back(0);
+  i64 off = 0;
+
+  // The distance between S and P is only reduced by shrink_size(), but
+  // page(S) – page(P) may still increase by one page due to address
+  // changes, so we add a safety margin.
+  //
+  // For example, page(0x1200) – page(0x1000) is 0, whereas
+  // page(0x1100) – page(0xfff) is 0x1000, even though the latter
+  // distance is shorter than the former.
+  auto is_small = [](i64 prel) {
+    return is_int(prel + 0x1000, 33) && is_int(prel - 0x1000, 33);
+  };
+
+  for (Symbol<E> *sym : symbols) {
+    u64 S = sym->get_addr(ctx);
+    u64 P = get_addr() + off;
+    i64 prel = page(S) - page(P);
+    off += is_small(prel) ? 16 : 32;
+    offsets.push_back(off);
+  }
+}
+
+template <>
+void Thunk<E>::copy_buf(Context<E> &ctx) {
+  // Short thunk with a 33 bit displacement
+  constexpr ul32 insn1[] = {
+    0x9000'0010, // adrp x16, 0
+    0x9100'0210, // add  x16, x16
+    0xd61f'0200, // br   x16
+    0xd420'7d00, // brk
+  };
+
+  // Long thunk with a 64 bit displacement
+  constexpr ul32 insn2[] = {
+    0x1000'0010, // adr  x16, 0
+    0xd2a0'0011, // movz x17, 0, lsl #16
+    0xf2c0'0011, // movk x17, 0, lsl #32
+    0xf2e0'0011, // movk x17, 0, lsl #48
+    0x8b11'0210, // add  x16, x16, x17
+    0xd61f'0200, // br   x16
+    0xd420'7d00, // brk
+    0xd420'7d00, // brk
+  };
+
+  u8 *base = ctx.buf + output_section.shdr.sh_offset + offset;
+
+  for (i64 i = 0; i < symbols.size(); i++) {
+    u64 S = symbols[i]->get_addr(ctx);
+    u64 P = get_addr() + offsets[i];
+    u8 *buf = base + offsets[i];
+
+    if (offsets[i + 1] - offsets[i] == 16) {
+      i64 prel = page(S) - page(P);
+      assert(is_int(prel, 33));
+      memcpy(buf, insn1, sizeof(insn1));
+      write_adrp(buf, prel);
+      *(ul32 *)(buf + 4) |= bits(S, 11, 0) << 10;
+    } else {
+      memcpy(buf, insn2, sizeof(insn2));
+      write_adr(buf, bits(S - P, 15, 0));
+      *(ul32 *)(buf + 4) |= bits(S - P, 31, 16) << 5;
+      *(ul32 *)(buf + 8) |= bits(S - P, 47, 32) << 5;
+      *(ul32 *)(buf + 12) |= bits(S - P, 63, 48) << 5;
+    }
+  }
+}
+
+template class Thunk<E>;
+
+} // namespace mold
+
+#endif

src/arch-i386.cc

@@ -0,0 +1,602 @@
+// i386 is similar to x86-64 but lacks PC-relative memory access
+// instructions. So it's not straightforward to support position-
+// independent code (PIC) on that target.
+//
+// If an object file is compiled with -fPIC, a function that needs to load
+// a value from memory first obtains its own address with the following
+// code
+//
+//   call __x86.get_pc_thunk.bx
+//
+// where __x86.get_pc_thunk.bx is defined as
+//
+//   __x86.get_pc_thunk.bx:
+//     mov (%esp), %ebx  # move the return address to %ebx
+//     ret
+//
+// . With the function's own address (or, more precisely, the address
+// immediately after the call instruction), the function can compute an
+// absolute address of a variable with its address + link-time constant.
+//
+// Executing call-mov-ret isn't very cheap, and allocating one register to
+// store PC isn't cheap too, especially given that i386 has only 8
+// general-purpose registers. But that's the cost of PIC on i386. You need
+// to pay it when creating a .so and a position-independent executable.
+//
+// When a position-independent function calls another function, it sets
+// %ebx to the address of .got. Position-independent PLT entries use that
+// register to load values from .got.plt/.got.
+//
+// If we are creating a position-dependent executable (PDE), we can't
+// assume that %ebx is set to .got. For PDE, we need to create position-
+// dependent PLT entries which don't use %ebx.
+//
+// https://github.com/rui314/psabi/blob/main/i386.pdf
+
+#if MOLD_I386
+
+#include "mold.h"
+
+namespace mold {
+
+using E = I386;
+
+template <>
+i64 get_addend(u8 *loc, const ElfRel<E> &rel) {
+  switch (rel.r_type) {
+  case R_386_8:
+  case R_386_PC8:
+    return *(i8 *)loc;
+  case R_386_16:
+  case R_386_PC16:
+    return *(il16 *)loc;
+  case R_386_32:
+  case R_386_PC32:
+  case R_386_GOT32:
+  case R_386_GOT32X:
+  case R_386_PLT32:
+  case R_386_GOTOFF:
+  case R_386_GOTPC:
+  case R_386_TLS_LDM:
+  case R_386_TLS_GOTIE:
+  case R_386_TLS_LE:
+  case R_386_TLS_IE:
+  case R_386_TLS_GD:
+  case R_386_TLS_LDO_32:
+  case R_386_SIZE32:
+  case R_386_TLS_GOTDESC:
+    return *(il32 *)loc;
+  default:
+    return 0;
+  }
+}
+
+template <>
+void write_addend(u8 *loc, i64 val, const ElfRel<E> &rel) {
+  switch (rel.r_type) {
+  case R_386_NONE:
+    break;
+  case R_386_8:
+  case R_386_PC8:
+    *loc = val;
+    break;
+  case R_386_16:
+  case R_386_PC16:
+    *(ul16 *)loc = val;
+    break;
+  case R_386_32:
+  case R_386_PC32:
+  case R_386_GOT32:
+  case R_386_GOT32X:
+  case R_386_PLT32:
+  case R_386_GOTOFF:
+  case R_386_GOTPC:
+  case R_386_TLS_LDM:
+  case R_386_TLS_GOTIE:
+  case R_386_TLS_LE:
+  case R_386_TLS_IE:
+  case R_386_TLS_GD:
+  case R_386_TLS_LDO_32:
+  case R_386_SIZE32:
+  case R_386_TLS_GOTDESC:
+    *(ul32 *)loc = val;
+    break;
+  default:
+    unreachable();
+  }
+}
+
+template <>
+void write_plt_header(Context<E> &ctx, u8 *buf) {
+  if (ctx.arg.pic) {
+    static const u8 insn[] = {
+      0x51,                   // push   %ecx
+      0x8d, 0x8b, 0, 0, 0, 0, // lea    GOTPLT+4(%ebx), %ecx
+      0xff, 0x31,             // push   (%ecx)
+      0xff, 0x61, 0x04,       // jmp    *0x4(%ecx)
+      0xcc, 0xcc, 0xcc, 0xcc, // (padding)
+    };
+    memcpy(buf, insn, sizeof(insn));
+    *(ul32 *)(buf + 3) = ctx.gotplt->shdr.sh_addr - ctx.got->shdr.sh_addr + 4;
+  } else {
+    static const u8 insn[] = {
+      0x51,                         // push   %ecx
+      0xb9, 0, 0, 0, 0,             // mov    GOTPLT+4, %ecx
+      0xff, 0x31,                   // push   (%ecx)
+      0xff, 0x61, 0x04,             // jmp    *0x4(%ecx)
+      0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // (padding)
+    };
+    memcpy(buf, insn, sizeof(insn));
+    *(ul32 *)(buf + 2) = ctx.gotplt->shdr.sh_addr + 4;
+  }
+}
+
+template <>
+void write_plt_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  if (ctx.arg.pic) {
+    static const u8 insn[] = {
+      0xb9, 0, 0, 0, 0,             // mov $reloc_offset, %ecx
+      0xff, 0xa3, 0, 0, 0, 0,       // jmp *foo@GOT(%ebx)
+      0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // (padding)
+    };
+    memcpy(buf, insn, sizeof(insn));
+    *(ul32 *)(buf + 1) = sym.get_plt_idx(ctx) * sizeof(ElfRel<E>);
+    *(ul32 *)(buf + 7) = sym.get_gotplt_addr(ctx) - ctx.got->shdr.sh_addr;
+  } else {
+    static const u8 insn[] = {
+      0xb9, 0, 0, 0, 0,             // mov $reloc_offset, %ecx
+      0xff, 0x25, 0, 0, 0, 0,       // jmp *foo@GOT
+      0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // (padding)
+    };
+    memcpy(buf, insn, sizeof(insn));
+    *(ul32 *)(buf + 1) = sym.get_plt_idx(ctx) * sizeof(ElfRel<E>);
+    *(ul32 *)(buf + 7) = sym.get_gotplt_addr(ctx);
+  }
+}
+
+template <>
+void write_pltgot_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  if (ctx.arg.pic) {
+    static const u8 insn[] = {
+      0xff, 0xa3, 0, 0, 0, 0, // jmp *foo@GOT(%ebx)
+      0xcc, 0xcc,             // (padding)
+    };
+    memcpy(buf, insn, sizeof(insn));
+    *(ul32 *)(buf + 2) = sym.get_got_pltgot_addr(ctx) - ctx.got->shdr.sh_addr;
+  } else {
+    static const u8 insn[] = {
+      0xff, 0x25, 0, 0, 0, 0, // jmp *foo@GOT
+      0xcc, 0xcc,             // (padding)
+    };
+    memcpy(buf, insn, sizeof(insn));
+    *(ul32 *)(buf + 2) = sym.get_got_pltgot_addr(ctx);
+  }
+}
+
+template <>
+void EhFrameSection<E>::apply_eh_reloc(Context<E> &ctx, const ElfRel<E> &rel,
+                                       u64 offset, u64 val) {
+  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
+
+  switch (rel.r_type) {
+  case R_NONE:
+    break;
+  case R_386_32:
+    *(ul32 *)loc = val;
+    break;
+  case R_386_PC32:
+    *(ul32 *)loc = val - this->shdr.sh_addr - offset;
+    break;
+  default:
+    Fatal(ctx) << "unsupported relocation in .eh_frame: " << rel;
+  }
+}
+
+static u32 relax_got32x(u8 *loc) {
+  // mov imm(%reg1), %reg2 -> lea imm(%reg1), %reg2
+  if (loc[0] == 0x8b)
+    return 0x8d00 | loc[1];
+  return 0;
+}
+
+// Relax GD to LE
+static void relax_gd_to_le(u8 *loc, ElfRel<E> rel, u64 val) {
+  static const u8 insn[] = {
+    0x65, 0xa1, 0, 0, 0, 0, // mov %gs:0, %eax
+    0x81, 0xc0, 0, 0, 0, 0, // add $tp_offset, %eax
+  };
+
+  switch (rel.r_type) {
+  case R_386_PLT32:
+  case R_386_PC32:
+    memcpy(loc - 3, insn, sizeof(insn));
+    *(ul32 *)(loc + 5) = val;
+    break;
+  case R_386_GOT32:
+  case R_386_GOT32X:
+    memcpy(loc - 2, insn, sizeof(insn));
+    *(ul32 *)(loc + 6) = val;
+    break;
+  default:
+    unreachable();
+  }
+}
+
+// Relax LD to LE
+static void relax_ld_to_le(u8 *loc, ElfRel<E> rel, u64 tls_size) {
+  switch (rel.r_type) {
+  case R_386_PLT32:
+  case R_386_PC32: {
+    static const u8 insn[] = {
+      0x65, 0xa1, 0, 0, 0, 0, // mov %gs:0, %eax
+      0x2d, 0, 0, 0, 0,       // sub $tls_size, %eax
+    };
+    memcpy(loc - 2, insn, sizeof(insn));
+    *(ul32 *)(loc + 5) = tls_size;
+    break;
+  }
+  case R_386_GOT32:
+  case R_386_GOT32X: {
+    static const u8 insn[] = {
+      0x65, 0xa1, 0, 0, 0, 0, // mov %gs:0, %eax
+      0x81, 0xe8, 0, 0, 0, 0, // sub $tls_size, %eax
+    };
+    memcpy(loc - 2, insn, sizeof(insn));
+    *(ul32 *)(loc + 6) = tls_size;
+    break;
+  }
+  default:
+    unreachable();
+  }
+}
+
+static u32 relax_tlsdesc_to_ie(u8 *loc) {
+  switch ((loc[0] << 8) | loc[1]) {
+  case 0x8d83: return 0x8b83; // lea 0(%ebx), %eax -> mov 0(%ebx), %eax
+  case 0x8d9b: return 0x8b9b; // lea 0(%ebx), %ebx -> mov 0(%ebx), %ebx
+  case 0x8d8b: return 0x8b8b; // lea 0(%ebx), %ecx -> mov 0(%ebx), %ecx
+  case 0x8d93: return 0x8b93; // lea 0(%ebx), %edx -> mov 0(%ebx), %edx
+  case 0x8db3: return 0x8bb3; // lea 0(%ebx), %esi -> mov 0(%ebx), %esi
+  case 0x8dbb: return 0x8bbb; // lea 0(%ebx), %edi -> mov 0(%ebx), %edi
+  case 0x8da3: return 0x8ba3; // lea 0(%ebx), %esp -> mov 0(%ebx), %esp
+  case 0x8dab: return 0x8bab; // lea 0(%ebx), %ebp -> mov 0(%ebx), %ebp
+  }
+  return 0;
+}
+
+static u32 relax_tlsdesc_to_le(u8 *loc) {
+  switch ((loc[0] << 8) | loc[1]) {
+  case 0x8d83: return 0x90b8; // lea 0(%ebx), %eax -> mov $0, %eax
+  case 0x8d9b: return 0x90bb; // lea 0(%ebx), %ebx -> mov $0, %ebx
+  case 0x8d8b: return 0x90b9; // lea 0(%ebx), %ecx -> mov $0, %ecx
+  case 0x8d93: return 0x90ba; // lea 0(%ebx), %edx -> mov $0, %edx
+  case 0x8db3: return 0x90be; // lea 0(%ebx), %esi -> mov $0, %esi
+  case 0x8dbb: return 0x90bf; // lea 0(%ebx), %edi -> mov $0, %edi
+  case 0x8da3: return 0x90bc; // lea 0(%ebx), %esp -> mov $0, %esp
+  case 0x8dab: return 0x90bd; // lea 0(%ebx), %ebp -> mov $0, %ebp
+  }
+  return 0;
+}
+
+template <>
+void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE)
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    u64 S = sym.get_addr(ctx);
+    u64 A = get_addend(*this, rel);
+    u64 P = get_addr() + rel.r_offset;
+    u64 G = sym.get_got_idx(ctx) * sizeof(Word<E>);
+    u64 GOT = ctx.got->shdr.sh_addr;
+
+    auto check = [&](i64 val, i64 lo, i64 hi) {
+      check_range(ctx, i, val, lo, hi);
+    };
+
+    switch (rel.r_type) {
+    case R_386_8:
+      check(S + A, 0, 1 << 8);
+      *loc = S + A;
+      break;
+    case R_386_16:
+      check(S + A, 0, 1 << 16);
+      *(ul16 *)loc = S + A;
+      break;
+    case R_386_32:
+      break;
+    case R_386_PC8:
+      check(S + A - P, -(1 << 7), 1 << 7);
+      *loc = S + A - P;
+      break;
+    case R_386_PC16:
+      check(S + A - P, -(1 << 15), 1 << 15);
+      *(ul16 *)loc = S + A - P;
+      break;
+    case R_386_PC32:
+    case R_386_PLT32:
+      *(ul32 *)loc = S + A - P;
+      break;
+    case R_386_GOT32:
+      *(ul32 *)loc = G + A;
+      break;
+    case R_386_GOT32X:
+      if (sym.has_got(ctx)) {
+        *(ul32 *)loc = G + A;
+      } else {
+        u32 insn = relax_got32x(loc - 2);
+        assert(insn);
+        loc[-2] = insn >> 8;
+        loc[-1] = insn;
+        *(ul32 *)loc = S + A - GOT;
+      }
+      break;
+    case R_386_GOTOFF:
+      *(ul32 *)loc = S + A - GOT;
+      break;
+    case R_386_GOTPC:
+      *(ul32 *)loc = GOT + A - P;
+      break;
+    case R_386_TLS_GOTIE:
+      *(ul32 *)loc = sym.get_gottp_addr(ctx) + A - GOT;
+      break;
+    case R_386_TLS_LE:
+      *(ul32 *)loc = S + A - ctx.tp_addr;
+      break;
+    case R_386_TLS_IE:
+      *(ul32 *)loc = sym.get_gottp_addr(ctx) + A;
+      break;
+    case R_386_TLS_GD:
+      if (sym.has_tlsgd(ctx))
+        *(ul32 *)loc = sym.get_tlsgd_addr(ctx) + A - GOT;
+      else
+        relax_gd_to_le(loc, rels[++i], S - ctx.tp_addr);
+      break;
+    case R_386_TLS_LDM:
+      if (ctx.got->has_tlsld(ctx))
+        *(ul32 *)loc = ctx.got->get_tlsld_addr(ctx) + A - GOT;
+      else
+        relax_ld_to_le(loc, rels[++i], ctx.tp_addr - ctx.tls_begin);
+      break;
+    case R_386_TLS_LDO_32:
+      *(ul32 *)loc = S + A - ctx.dtp_addr;
+      break;
+    case R_386_SIZE32:
+      *(ul32 *)loc = sym.esym().st_size + A;
+      break;
+    case R_386_TLS_GOTDESC:
+      // i386 TLSDESC uses the following code sequence to materialize
+      // a TP-relative address in %eax.
+      //
+      //   lea    0(%ebx), %eax
+      //       R_386_TLS_GOTDESC   foo
+      //   call   *(%eax)
+      //       R_386_TLS_DESC_CALL foo
+      //
+      // We may relax the instructions to the following if its TP-relative
+      // address is known at link-time
+      //
+      //   mov     $foo@TPOFF, %eax
+      //   nop
+      //
+      // or to the following if the TP-relative address is known at
+      // process startup time.
+      //
+      //   mov     foo@GOTTPOFF(%ebx), %eax
+      //   nop
+      //
+      // We allow the following alternative code sequence too because
+      // LLVM emits such code.
+      //
+      //   lea    0(%ebx), %reg
+      //       R_386_TLS_GOTDESC   foo
+      //   mov    %reg, %eax
+      //   call   *(%eax)
+      //       R_386_TLS_DESC_CALL foo
+      //
+      // Note that the compiler always uses the local-exec TLS model
+      // for -fno-pic, so TLSDESC code is always PIC (i.e. uses %ebx to
+      // store the address of GOT.)
+      if (sym.has_tlsdesc(ctx)) {
+        *(ul32 *)loc = sym.get_tlsdesc_addr(ctx) + A - GOT;
+      } else if (sym.has_gottp(ctx)) {
+        u32 insn = relax_tlsdesc_to_ie(loc - 2);
+        if (!insn)
+          Fatal(ctx) << *this << ": illegal instruction sequence for TLSDESC";
+        loc[-2] = insn >> 8;
+        loc[-1] = insn;
+        *(ul32 *)loc = sym.get_gottp_addr(ctx) + A - GOT;
+      } else {
+        u32 insn = relax_tlsdesc_to_le(loc - 2);
+        if (!insn)
+          Fatal(ctx) << *this << ": illegal instruction sequence for TLSDESC";
+        loc[-2] = insn >> 8;
+        loc[-1] = insn;
+        *(ul32 *)loc = S + A - ctx.tp_addr;
+      }
+      break;
+    case R_386_TLS_DESC_CALL:
+      if (!sym.has_tlsdesc(ctx)) {
+        // call *(%eax) -> nop
+        loc[0] = 0x66;
+        loc[1] = 0x90;
+      }
+      break;
+    default:
+      unreachable();
+    }
+  }
+}
+
+template <>
+void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    SectionFragment<E> *frag;
+    i64 frag_addend;
+    std::tie(frag, frag_addend) = get_fragment(ctx, rel);
+
+    u64 S = frag ? frag->get_addr(ctx) : sym.get_addr(ctx);
+    u64 A = frag ? frag_addend : get_addend(*this, rel);
+    u64 GOT = ctx.got->shdr.sh_addr;
+
+    auto check = [&](i64 val, i64 lo, i64 hi) {
+      check_range(ctx, val, i, lo, hi);
+    };
+
+    switch (rel.r_type) {
+    case R_386_8:
+      check(S + A, 0, 1 << 8);
+      *loc = S + A;
+      break;
+    case R_386_16:
+      check(S + A, 0, 1 << 16);
+      *(ul16 *)loc = S + A;
+      break;
+    case R_386_32:
+      if (std::optional<u64> val = get_tombstone(sym, frag))
+        *(ul32 *)loc = *val;
+      else
+        *(ul32 *)loc = S + A;
+      break;
+    case R_386_PC8:
+      check(S + A, -(1 << 7), 1 << 7);
+      *loc = S + A;
+      break;
+    case R_386_PC16:
+      check(S + A, -(1 << 15), 1 << 15);
+      *(ul16 *)loc = S + A;
+      break;
+    case R_386_PC32:
+      *(ul32 *)loc = S + A;
+      break;
+    case R_386_GOTPC:
+      *(ul32 *)loc = GOT + A;
+      break;
+    case R_386_GOTOFF:
+      *(ul32 *)loc = S + A - GOT;
+      break;
+    case R_386_TLS_LDO_32:
+      if (std::optional<u64> val = get_tombstone(sym, frag))
+        *(ul32 *)loc = *val;
+      else
+        *(ul32 *)loc = S + A - ctx.dtp_addr;
+      break;
+    case R_386_SIZE32:
+      *(ul32 *)loc = sym.esym().st_size + A;
+      break;
+    default:
+      unreachable();
+    }
+  }
+}
+
+template <>
+void InputSection<E>::scan_relocations(Context<E> &ctx) {
+  assert(shdr().sh_flags & SHF_ALLOC);
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  // Scan relocations
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = (u8 *)(contents.data() + rel.r_offset);
+
+    if (sym.is_ifunc())
+      sym.flags |= NEEDS_GOT | NEEDS_PLT;
+
+    if (rel.r_type == R_386_TLS_GD || rel.r_type == R_386_TLS_LDM) {
+      if (i + 1 == rels.size())
+        Fatal(ctx) << *this << ": " << rel << " must be followed by PLT or GOT32";
+
+      if (u32 ty = rels[i + 1].r_type;
+          ty != R_386_PLT32 && ty != R_386_PC32 &&
+          ty != R_386_GOT32 && ty != R_386_GOT32X)
+        Fatal(ctx) << *this << ": " << rel << " must be followed by PLT or GOT32";
+    }
+
+    switch (rel.r_type) {
+    case R_386_8:
+    case R_386_16:
+      scan_absrel(ctx, sym, rel);
+      break;
+    case R_386_PC8:
+    case R_386_PC16:
+    case R_386_PC32:
+      scan_pcrel(ctx, sym, rel);
+      break;
+    case R_386_GOT32:
+    case R_386_GOTPC:
+      sym.flags |= NEEDS_GOT;
+      break;
+    case R_386_GOT32X:
+      // We always want to relax GOT32X even if --no-relax is given
+      // because static PIE doesn't work without it.
+      if (sym.is_pcrel_linktime_const(ctx) && relax_got32x(loc - 2)) {
+        // Do nothing
+      } else {
+        sym.flags |= NEEDS_GOT;
+      }
+      break;
+    case R_386_PLT32:
+      if (sym.is_imported)
+        sym.flags |= NEEDS_PLT;
+      break;
+    case R_386_TLS_GOTIE:
+    case R_386_TLS_IE:
+      sym.flags |= NEEDS_GOTTP;
+      break;
+    case R_386_TLS_GD:
+      // We always relax if -static because libc.a doesn't contain
+      // __tls_get_addr().
+      if (ctx.arg.static_ || (ctx.arg.relax && sym.is_tprel_linktime_const(ctx)))
+        i++;
+      else
+        sym.flags |= NEEDS_TLSGD;
+      break;
+    case R_386_TLS_LDM:
+      // We always relax if -static because libc.a doesn't contain
+      // __tls_get_addr().
+      if (ctx.arg.static_ || (ctx.arg.relax && !ctx.arg.shared))
+        i++;
+      else
+        ctx.needs_tlsld = true;
+      break;
+    case R_386_TLS_GOTDESC:
+      scan_tlsdesc(ctx, sym);
+      break;
+    case R_386_TLS_LE:
+      check_tlsle(ctx, sym, rel);
+      break;
+    case R_386_32:
+    case R_386_GOTOFF:
+    case R_386_TLS_LDO_32:
+    case R_386_SIZE32:
+    case R_386_TLS_DESC_CALL:
+      break;
+    default:
+      Error(ctx) << *this << ": unknown relocation: " << rel;
+    }
+  }
+}
+
+} // namespace mold
+
+#endif

src/arch-m68k.cc

@@ -0,0 +1,316 @@
+// This file contains code for the Motorola 68000 series microprocessors,
+// which is often abbreviated as m68k. Running a Unix-like system on a
+// m68k-based machine today is a retro-computing hobby activity, but the
+// processor was a popular choice to build Unix computers during '80s.
+// Early Sun workstations for example used m68k. Macintosh until 1994 were
+// based on m68k as well until they switched to PowerPC (and then to x86
+// and to ARM.)
+//
+// From the linker's point of view, it is not hard to support m68k. It's
+// just a 32-bit big-endian CISC ISA. Compared to comtemporary i386,
+// m68k's psABI is actually simpler because m68k has PC-relative memory
+// access instructions and therefore can support position-independent
+// code without too much hassle.
+//
+// https://github.com/rui314/psabi/blob/main/m68k.pdf
+
+#if MOLD_M68K
+
+#include "mold.h"
+
+namespace mold {
+
+using E = M68K;
+
+template <>
+void write_plt_header(Context<E> &ctx, u8 *buf) {
+  static const u8 insn[] = {
+    0x2f, 0x00,                         // move.l %d0, -(%sp)
+    0x2f, 0x3b, 0x01, 0x70, 0, 0, 0, 0, // move.l (GOTPLT+4, %pc), -(%sp)
+    0x4e, 0xfb, 0x01, 0x71, 0, 0, 0, 0, // jmp    ([GOTPLT+8, %pc])
+  };
+
+  memcpy(buf, insn, sizeof(insn));
+  *(ub32 *)(buf + 6) = ctx.gotplt->shdr.sh_addr - ctx.plt->shdr.sh_addr;
+  *(ub32 *)(buf + 14) = ctx.gotplt->shdr.sh_addr - ctx.plt->shdr.sh_addr - 4;
+}
+
+template <>
+void write_plt_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  static const u8 insn[] = {
+    0x20, 0x3c, 0, 0, 0, 0,             // move.l PLT_OFFSET, %d0
+    0x4e, 0xfb, 0x01, 0x71, 0, 0, 0, 0, // jmp    ([GOTPLT_ENTRY, %pc])
+  };
+
+  memcpy(buf, insn, sizeof(insn));
+  *(ub32 *)(buf + 2) = sym.get_plt_idx(ctx) * sizeof(ElfRel<E>);
+  *(ub32 *)(buf + 10) = sym.get_gotplt_addr(ctx) - sym.get_plt_addr(ctx) - 8;
+}
+
+template <>
+void write_pltgot_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  static const u8 insn[] = {
+    0x4e, 0xfb, 0x01, 0x71, 0, 0, 0, 0, // jmp ([GOT_ENTRY, %pc])
+  };
+
+  memcpy(buf, insn, sizeof(insn));
+  *(ub32 *)(buf + 4) = sym.get_got_pltgot_addr(ctx) - sym.get_plt_addr(ctx) - 2;
+}
+
+template <>
+void EhFrameSection<E>::apply_eh_reloc(Context<E> &ctx, const ElfRel<E> &rel,
+                                       u64 offset, u64 val) {
+  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
+
+  switch (rel.r_type) {
+  case R_NONE:
+    break;
+  case R_68K_32:
+    *(ub32 *)loc = val;
+    break;
+  case R_68K_PC32:
+    *(ub32 *)loc = val - this->shdr.sh_addr - offset;
+    break;
+  default:
+    Fatal(ctx) << "unsupported relocation in .eh_frame: " << rel;
+  }
+}
+
+template <>
+void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE)
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    u64 S = sym.get_addr(ctx);
+    u64 A = rel.r_addend;
+    u64 P = get_addr() + rel.r_offset;
+    u64 G = sym.get_got_idx(ctx) * sizeof(Word<E>);
+    u64 GOT = ctx.got->shdr.sh_addr;
+
+    auto check = [&](i64 val, i64 lo, i64 hi) {
+      check_range(ctx, i, val, lo, hi);
+    };
+
+    auto write16 = [&](u64 val) {
+      check(val, 0, 1 << 16);
+      *(ub16 *)loc = val;
+    };
+
+    auto write16s = [&](u64 val) {
+      check(val, -(1 << 15), 1 << 15);
+      *(ub16 *)loc = val;
+    };
+
+    auto write8 = [&](u64 val) {
+      check(val, 0, 1 << 8);
+      *loc = val;
+    };
+
+    auto write8s = [&](u64 val) {
+      check(val, -(1 << 7), 1 << 7);
+      *loc = val;
+    };
+
+    switch (rel.r_type) {
+    case R_68K_32:
+      break;
+    case R_68K_16:
+      write16(S + A);
+      break;
+    case R_68K_8:
+      write8(S + A);
+      break;
+    case R_68K_PC32:
+    case R_68K_PLT32:
+      *(ub32 *)loc = S + A - P;
+      break;
+    case R_68K_PC16:
+    case R_68K_PLT16:
+      write16s(S + A - P);
+      break;
+    case R_68K_PC8:
+    case R_68K_PLT8:
+      write8s(S + A - P);
+      break;
+    case R_68K_GOTPCREL32:
+      *(ub32 *)loc = GOT + A - P;
+      break;
+    case R_68K_GOTPCREL16:
+      write16s(GOT + A - P);
+      break;
+    case R_68K_GOTPCREL8:
+      write8s(GOT + A - P);
+      break;
+    case R_68K_GOTOFF32:
+      *(ub32 *)loc = G + A;
+      break;
+    case R_68K_GOTOFF16:
+      write16(G + A);
+      break;
+    case R_68K_GOTOFF8:
+      write8(G + A);
+      break;
+    case R_68K_TLS_GD32:
+      *(ub32 *)loc = sym.get_tlsgd_addr(ctx) + A - GOT;
+      break;
+    case R_68K_TLS_GD16:
+      write16(sym.get_tlsgd_addr(ctx) + A - GOT);
+      break;
+    case R_68K_TLS_GD8:
+      write8(sym.get_tlsgd_addr(ctx) + A - GOT);
+      break;
+    case R_68K_TLS_LDM32:
+      *(ub32 *)loc = ctx.got->get_tlsld_addr(ctx) + A - GOT;
+      break;
+    case R_68K_TLS_LDM16:
+      write16(ctx.got->get_tlsld_addr(ctx) + A - GOT);
+      break;
+    case R_68K_TLS_LDM8:
+      write8(ctx.got->get_tlsld_addr(ctx) + A - GOT);
+      break;
+    case R_68K_TLS_LDO32:
+      *(ub32 *)loc = S + A - ctx.dtp_addr;
+      break;
+    case R_68K_TLS_LDO16:
+      write16s(S + A - ctx.dtp_addr);
+      break;
+    case R_68K_TLS_LDO8:
+      write8s(S + A - ctx.dtp_addr);
+      break;
+    case R_68K_TLS_IE32:
+      *(ub32 *)loc = sym.get_gottp_addr(ctx) + A - GOT;
+      break;
+    case R_68K_TLS_IE16:
+      write16(sym.get_gottp_addr(ctx) + A - GOT);
+      break;
+    case R_68K_TLS_IE8:
+      write8(sym.get_gottp_addr(ctx) + A - GOT);
+      break;
+    case R_68K_TLS_LE32:
+      *(ub32 *)loc = S + A - ctx.tp_addr;
+      break;
+    case R_68K_TLS_LE16:
+      write16(S + A - ctx.tp_addr);
+      break;
+    case R_68K_TLS_LE8:
+      write8(S + A - ctx.tp_addr);
+      break;
+    default:
+      unreachable();
+    }
+  }
+}
+
+template <>
+void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    SectionFragment<E> *frag;
+    i64 frag_addend;
+    std::tie(frag, frag_addend) = get_fragment(ctx, rel);
+
+    u64 S = frag ? frag->get_addr(ctx) : sym.get_addr(ctx);
+    u64 A = frag ? frag_addend : (i64)rel.r_addend;
+
+    switch (rel.r_type) {
+    case R_68K_32:
+      if (std::optional<u64> val = get_tombstone(sym, frag))
+        *(ub32 *)loc = *val;
+      else
+        *(ub32 *)loc = S + A;
+      break;
+    default:
+      Fatal(ctx) << *this << ": invalid relocation for non-allocated sections: "
+                 << rel;
+    }
+  }
+}
+
+template <>
+void InputSection<E>::scan_relocations(Context<E> &ctx) {
+  assert(shdr().sh_flags & SHF_ALLOC);
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+
+    if (sym.is_ifunc())
+      Error(ctx) << sym << ": GNU ifunc symbol is not supported on m68k";
+
+    switch (rel.r_type) {
+    case R_68K_16:
+    case R_68K_8:
+      scan_absrel(ctx, sym, rel);
+      break;
+    case R_68K_PC32:
+    case R_68K_PC16:
+    case R_68K_PC8:
+      scan_pcrel(ctx, sym, rel);
+      break;
+    case R_68K_GOTPCREL32:
+    case R_68K_GOTPCREL16:
+    case R_68K_GOTPCREL8:
+    case R_68K_GOTOFF32:
+    case R_68K_GOTOFF16:
+    case R_68K_GOTOFF8:
+      sym.flags |= NEEDS_GOT;
+      break;
+    case R_68K_PLT32:
+    case R_68K_PLT16:
+    case R_68K_PLT8:
+      if (sym.is_imported)
+        sym.flags |= NEEDS_PLT;
+      break;
+    case R_68K_TLS_GD32:
+    case R_68K_TLS_GD16:
+    case R_68K_TLS_GD8:
+      sym.flags |= NEEDS_TLSGD;
+      break;
+    case R_68K_TLS_LDM32:
+    case R_68K_TLS_LDM16:
+    case R_68K_TLS_LDM8:
+      ctx.needs_tlsld = true;
+      break;
+    case R_68K_TLS_IE32:
+    case R_68K_TLS_IE16:
+    case R_68K_TLS_IE8:
+      sym.flags |= NEEDS_GOTTP;
+      break;
+    case R_68K_TLS_LE32:
+    case R_68K_TLS_LE16:
+    case R_68K_TLS_LE8:
+      check_tlsle(ctx, sym, rel);
+      break;
+    case R_68K_32:
+    case R_68K_TLS_LDO32:
+    case R_68K_TLS_LDO16:
+    case R_68K_TLS_LDO8:
+      break;
+    default:
+      Error(ctx) << *this << ": unknown relocation: " << rel;
+    }
+  }
+}
+
+} // namespace mold
+
+#endif

src/arch-ppc32.cc

@@ -0,0 +1,451 @@
+// This file implements the PowerPC 32-bit ISA. For 64-bit PowerPC, see
+// arch-ppc64v1.cpp and arch-ppc64v2.cpp.
+//
+// PPC32 is a RISC ISA. It has 32 general-purpose registers (GPRs).
+// r0, r11 and r12 are reserved for static linkers, so we can use these
+// registers in PLTs and range extension thunks. In addition to that, it
+// has a few special registers. Notable ones are LR which holds a return
+// address and CTR which we can use to store a branch target address.
+//
+// It feels that the PPC32 psABI is unnecessarily complicated at first
+// glance, but that is mainly stemmed from the fact that the ISA lacks
+// PC-relative load/store instructions. Since machine instructions cannot
+// load data relative to its own address, it is not straightforward to
+// support position-independent code (PIC) on PPC32.
+//
+// A position-independent function typically contains the following code
+// in the prologue to obtain its own address:
+//
+//    mflr  r0        // save the current return address to %r0
+//    bcl   20, 31, 4 // call the next instruction as if it were a function
+//    mtlr  r12       // save the return address to %r12
+//    mtlr  r0        // restore the original return address
+//
+// An object file compiled with -fPIC contains a data section named
+// `.got2` to store addresses of locally-defined global variables and
+// constants. A PIC function usually computes its .got2+0x8000 and set it
+// to %r30. This scheme allows the function to access global objects
+// defined in the same input file with a single %r30-relative load/store
+// instruction with a 16-bit offset, given that .got2 is smaller than
+// 0x10000 (or 65536) bytes.
+//
+// Since each object file has its own .got2, %r30 refers to different
+// places in a merged .got2 for two functions that came from different
+// input files. Therefore, %r30 makes sense only within a single function.
+//
+// Technically, we can reuse a %r30 value in our PLT if we create a PLT
+// _for each input file_ (that's what GNU ld seems to be doing), but that
+// doesn't seems to be worth its complexity. Our PLT simply doesn't rely
+// on a %r30 value.
+//
+// https://github.com/rui314/psabi/blob/main/ppc32.pdf
+
+#if MOLD_PPC32
+
+#include "mold.h"
+
+namespace mold {
+
+using E = PPC32;
+
+static u64 lo(u64 x)    { return x & 0xffff; }
+static u64 hi(u64 x)    { return x >> 16; }
+static u64 ha(u64 x)    { return (x + 0x8000) >> 16; }
+static u64 high(u64 x)  { return (x >> 16) & 0xffff; }
+static u64 higha(u64 x) { return ((x + 0x8000) >> 16) & 0xffff; }
+
+template <>
+void write_plt_header(Context<E> &ctx, u8 *buf) {
+  constexpr ub32 insn[] = {
+    // Get the address of this PLT section
+    0x7c08'02a6, //    mflr    r0
+    0x429f'0005, //    bcl     20, 31, 4
+    0x7d88'02a6, // 1: mflr    r12
+    0x7c08'03a6, //    mtlr    r0
+
+    // Compute the runtime address of GOTPLT+12
+    0x3d8c'0000, //    addis   r12, r12, (GOTPLT - 1b)@higha
+    0x398c'0000, //    addi    r12, r12, (GOTPLT - 1b)@lo
+
+    // Compute the PLT entry offset
+    0x7d6c'5850, //    sub     r11, r11, r12
+    0x1d6b'0003, //    mulli   r11, r11, 3
+
+    // Load GOTPLT[2] and branch to GOTPLT[1]
+    0x800c'fff8, //    lwz     r0,  -8(r12)
+    0x7c09'03a6, //    mtctr   r0
+    0x818c'fffc, //    lwz     r12, -4(r12)
+    0x4e80'0420, //    bctr
+    0x6000'0000, //    nop
+    0x6000'0000, //    nop
+    0x6000'0000, //    nop
+    0x6000'0000, //    nop
+  };
+
+  static_assert(sizeof(insn) == E::plt_hdr_size);
+  memcpy(buf, insn, sizeof(insn));
+
+  ub32 *loc = (ub32 *)buf;
+  loc[4] |= higha(ctx.gotplt->shdr.sh_addr - ctx.plt->shdr.sh_addr + 4);
+  loc[5] |= lo(ctx.gotplt->shdr.sh_addr - ctx.plt->shdr.sh_addr + 4);
+}
+
+static constexpr ub32 plt_entry[] = {
+  // Get the address of this PLT entry
+  0x7c08'02a6, // mflr    r0
+  0x429f'0005, // bcl     20, 31, 4
+  0x7d88'02a6, // mflr    r12
+  0x7c08'03a6, // mtlr    r0
+
+  // Load an address from the GOT/GOTPLT entry and jump to that address
+  0x3d6c'0000, // addis   r11, r12, OFFSET@higha
+  0x396b'0000, // addi    r11, r11, OFFSET@lo
+  0x818b'0000, // lwz     r12, 0(r11)
+  0x7d89'03a6, // mtctr   r12
+  0x4e80'0420, // bctr
+};
+
+template <>
+void write_plt_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  static_assert(E::plt_size == sizeof(plt_entry));
+  memcpy(buf, plt_entry, sizeof(plt_entry));
+
+  ub32 *loc = (ub32 *)buf;
+  i64 offset = sym.get_gotplt_addr(ctx) - sym.get_plt_addr(ctx) - 8;
+  loc[4] |= higha(offset);
+  loc[5] |= lo(offset);
+}
+
+template <>
+void write_pltgot_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
+  static_assert(E::pltgot_size == sizeof(plt_entry));
+  memcpy(buf, plt_entry, sizeof(plt_entry));
+
+  ub32 *loc = (ub32 *)buf;
+  i64 offset = sym.get_got_pltgot_addr(ctx) - sym.get_plt_addr(ctx) - 8;
+  loc[4] |= higha(offset);
+  loc[5] |= lo(offset);
+}
+
+template <>
+void EhFrameSection<E>::apply_eh_reloc(Context<E> &ctx, const ElfRel<E> &rel,
+                                       u64 offset, u64 val) {
+  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
+
+  switch (rel.r_type) {
+  case R_NONE:
+    break;
+  case R_PPC_ADDR32:
+    *(ub32 *)loc = val;
+    break;
+  case R_PPC_REL32:
+    *(ub32 *)loc = val - this->shdr.sh_addr - offset;
+    break;
+  default:
+    Fatal(ctx) << "unsupported relocation in .eh_frame: " << rel;
+  }
+}
+
+template <>
+void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  u64 GOT2 = file.extra.got2 ? file.extra.got2->get_addr() : 0;
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE)
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    u64 S = sym.get_addr(ctx);
+    u64 A = rel.r_addend;
+    u64 P = get_addr() + rel.r_offset;
+    u64 G = sym.get_got_idx(ctx) * sizeof(Word<E>);
+    u64 GOT = ctx.got->shdr.sh_addr;
+
+    switch (rel.r_type) {
+    case R_PPC_ADDR14:
+      *(ub32 *)loc |= bits(S + A, 15, 2) << 2;
+      break;
+    case R_PPC_ADDR16:
+    case R_PPC_UADDR16:
+    case R_PPC_ADDR16_LO:
+      *(ub16 *)loc = lo(S + A);
+      break;
+    case R_PPC_ADDR16_HI:
+      *(ub16 *)loc = hi(S + A);
+      break;
+    case R_PPC_ADDR16_HA:
+      *(ub16 *)loc = ha(S + A);
+      break;
+    case R_PPC_ADDR24:
+      *(ub32 *)loc |= bits(S + A, 25, 2) << 2;
+      break;
+    case R_PPC_ADDR30:
+      *(ub32 *)loc |= bits(S + A, 31, 2) << 2;
+      break;
+    case R_PPC_PLT16_LO:
+      *(ub16 *)loc = lo(G + GOT - A - GOT2);
+      break;
+    case R_PPC_PLT16_HI:
+      *(ub16 *)loc = hi(G + GOT - A - GOT2);
+      break;
+    case R_PPC_PLT16_HA:
+      *(ub16 *)loc = ha(G + GOT - A - GOT2);
+      break;
+    case R_PPC_PLT32:
+      *(ub32 *)loc = G + GOT - A - GOT2;
+      break;
+    case R_PPC_REL14:
+      *(ub32 *)loc |= bits(S + A - P, 15, 2) << 2;
+      break;
+    case R_PPC_REL16:
+    case R_PPC_REL16_LO:
+      *(ub16 *)loc = lo(S + A - P);
+      break;
+    case R_PPC_REL16_HI:
+      *(ub16 *)loc = hi(S + A - P);
+      break;
+    case R_PPC_REL16_HA:
+      *(ub16 *)loc = ha(S + A - P);
+      break;
+    case R_PPC_REL24:
+    case R_PPC_LOCAL24PC: {
+      i64 val = S + A - P;
+      if (!is_int(val, 26))
+        val = sym.get_thunk_addr(ctx, P) - P;
+      *(ub32 *)loc |= bits(val, 25, 2) << 2;
+      break;
+    }
+    case R_PPC_PLTREL24: {
+      i64 val = S - P;
+      if (sym.has_plt(ctx) || !is_int(val, 26))
+        val = sym.get_thunk_addr(ctx, P) - P;
+      *(ub32 *)loc |= bits(val, 25, 2) << 2;
+      break;
+    }
+    case R_PPC_REL32:
+    case R_PPC_PLTREL32:
+      *(ub32 *)loc = S + A - P;
+      break;
+    case R_PPC_GOT16:
+    case R_PPC_GOT16_LO:
+      *(ub16 *)loc = lo(G + A);
+      break;
+    case R_PPC_GOT16_HI:
+      *(ub16 *)loc = hi(G + A);
+      break;
+    case R_PPC_GOT16_HA:
+      *(ub16 *)loc = ha(G + A);
+      break;
+    case R_PPC_TPREL16_LO:
+      *(ub16 *)loc = lo(S + A - ctx.tp_addr);
+      break;
+    case R_PPC_TPREL16_HI:
+      *(ub16 *)loc = hi(S + A - ctx.tp_addr);
+      break;
+    case R_PPC_TPREL16_HA:
+      *(ub16 *)loc = ha(S + A - ctx.tp_addr);
+      break;
+    case R_PPC_DTPREL16_LO:
+      *(ub16 *)loc = lo(S + A - ctx.dtp_addr);
+      break;
+    case R_PPC_DTPREL16_HI:
+      *(ub16 *)loc = hi(S + A - ctx.dtp_addr);
+      break;
+    case R_PPC_DTPREL16_HA:
+      *(ub16 *)loc = ha(S + A - ctx.dtp_addr);
+      break;
+    case R_PPC_GOT_TLSGD16:
+      *(ub16 *)loc = sym.get_tlsgd_addr(ctx) - GOT;
+      break;
+    case R_PPC_GOT_TLSLD16:
+      *(ub16 *)loc = ctx.got->get_tlsld_addr(ctx) - GOT;
+      break;
+    case R_PPC_GOT_TPREL16:
+      *(ub16 *)loc = sym.get_gottp_addr(ctx) - GOT;
+      break;
+    case R_PPC_ADDR32:
+    case R_PPC_UADDR32:
+    case R_PPC_TLS:
+    case R_PPC_TLSGD:
+    case R_PPC_TLSLD:
+    case R_PPC_PLTSEQ:
+    case R_PPC_PLTCALL:
+      break;
+    default:
+      unreachable();
+    }
+  }
+}
+
+template <>
+void InputSection<E>::apply_reloc_nonalloc(Context<E> &ctx, u8 *base) {
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+    u8 *loc = base + rel.r_offset;
+
+    SectionFragment<E> *frag;
+    i64 frag_addend;
+    std::tie(frag, frag_addend) = get_fragment(ctx, rel);
+
+    u64 S = frag ? frag->get_addr(ctx) : sym.get_addr(ctx);
+    u64 A = frag ? frag_addend : (i64)rel.r_addend;
+
+    switch (rel.r_type) {
+    case R_PPC_ADDR32:
+      if (std::optional<u64> val = get_tombstone(sym, frag))
+        *(ub32 *)loc = *val;
+      else
+        *(ub32 *)loc = S + A;
+      break;
+    case R_PPC_DTPREL32:
+      if (std::optional<u64> val = get_tombstone(sym, frag))
+        *(ub32 *)loc = *val;
+      else
+        *(ub32 *)loc = S + A - ctx.dtp_addr;
+      break;
+    default:
+      Fatal(ctx) << *this << ": invalid relocation for non-allocated sections: "
+                 << rel;
+    }
+  }
+}
+
+template <>
+void InputSection<E>::scan_relocations(Context<E> &ctx) {
+  assert(shdr().sh_flags & SHF_ALLOC);
+  std::span<const ElfRel<E>> rels = get_rels(ctx);
+
+  // Scan relocations
+  for (i64 i = 0; i < rels.size(); i++) {
+    const ElfRel<E> &rel = rels[i];
+    if (rel.r_type == R_NONE || record_undef_error(ctx, rel))
+      continue;
+
+    Symbol<E> &sym = *file.symbols[rel.r_sym];
+
+    if (sym.is_ifunc())
+      sym.flags |= NEEDS_GOT | NEEDS_PLT;
+
+    switch (rel.r_type) {
+    case R_PPC_ADDR14:
+    case R_PPC_ADDR16:
+    case R_PPC_UADDR16:
+    case R_PPC_ADDR16_LO:
+    case R_PPC_ADDR16_HI:
+    case R_PPC_ADDR16_HA:
+    case R_PPC_ADDR24:
+    case R_PPC_ADDR30:
+      scan_absrel(ctx, sym, rel);
+      break;
+    case R_PPC_REL14:
+    case R_PPC_REL16:
+    case R_PPC_REL16_LO:
+    case R_PPC_REL16_HI:
+    case R_PPC_REL16_HA:
+    case R_PPC_REL32:
+      scan_pcrel(ctx, sym, rel);
+      break;
+    case R_PPC_GOT16:
+    case R_PPC_GOT16_LO:
+    case R_PPC_GOT16_HI:
+    case R_PPC_GOT16_HA:
+    case R_PPC_PLT16_LO:
+    case R_PPC_PLT16_HI:
+    case R_PPC_PLT16_HA:
+    case R_PPC_PLT32:
+      sym.flags |= NEEDS_GOT;
+      break;
+    case R_PPC_REL24:
+    case R_PPC_PLTREL24:
+    case R_PPC_PLTREL32:
+      if (sym.is_imported)
+        sym.flags |= NEEDS_PLT;
+      break;
+    case R_PPC_GOT_TLSGD16:
+      sym.flags |= NEEDS_TLSGD;
+      break;
+    case R_PPC_GOT_TLSLD16:
+      ctx.needs_tlsld = true;
+      break;
+    case R_PPC_GOT_TPREL16:
+      sym.flags |= NEEDS_GOTTP;
+      break;
+    case R_PPC_TPREL16_LO:
+    case R_PPC_TPREL16_HI:
+    case R_PPC_TPREL16_HA:
+      check_tlsle(ctx, sym, rel);
+      break;
+    case R_PPC_ADDR32:
+    case R_PPC_UADDR32:
+    case R_PPC_LOCAL24PC:
+    case R_PPC_TLS:
+    case R_PPC_TLSGD:
+    case R_PPC_TLSLD:
+    case R_PPC_DTPREL16_LO:
+    case R_PPC_DTPREL16_HI:
+    case R_PPC_DTPREL16_HA:
+    case R_PPC_PLTSEQ:
+    case R_PPC_PLTCALL:
+      break;
+    default:
+      Error(ctx) << *this << ": unknown relocation: " << rel;
+    }
+  }
+}
+
+template <>
+void Thunk<E>::copy_buf(Context<E> &ctx) {
+  constexpr ub32 local_thunk[] = {
+    // Get this thunk's address
+    0x7c08'02a6, // mflr    r0
+    0x429f'0005, // bcl     20, 31, 4
+    0x7d88'02a6, // mflr    r12
+    0x7c08'03a6, // mtlr    r0
+
+    // Materialize the destination's address in %r11 and jump to that address
+    0x3d6c'0000, // addis   r11, r12, OFFSET@higha
+    0x396b'0000, // addi    r11, r11, OFFSET@lo
+    0x7d69'03a6, // mtctr   r11
+    0x4e80'0420, // bctr
+    0x6000'0000, // nop
+  };
+
+  static_assert(E::thunk_size == sizeof(plt_entry));
+  static_assert(E::thunk_size == sizeof(local_thunk));
+
+  u8 *base = ctx.buf + output_section.shdr.sh_offset + offset;
+
+  for (i64 i = 0; i < symbols.size(); i++) {
+    Symbol<E> &sym = *symbols[i];
+    u64 P = get_addr() + offsets[i];
+    u8 *buf = base + offsets[i];
+
+    if (sym.has_plt(ctx)) {
+      u64 got = sym.has_got(ctx) ? sym.get_got_addr(ctx) : sym.get_gotplt_addr(ctx);
+      i64 val = got - P - 8;
+      memcpy(buf, plt_entry, sizeof(plt_entry));
+      *(ub32 *)(buf + 16) |= higha(val);
+      *(ub32 *)(buf + 20) |= lo(val);
+    } else {
+      i64 val = sym.get_addr(ctx) - P - 8;
+      memcpy(buf, local_thunk, sizeof(local_thunk));
+      *(ub32 *)(buf + 16) |= higha(val);
+      *(ub32 *)(buf + 20) |= lo(val);
+    }
+  }
+}
+
+} // namespace mold
+
+#endif