[lld-macho] Check for arch compatibility when loading ObjFiles and TBDs

The silent failures had confused me a few times.

I haven't added a similar check for platform yet as we don't yet have logic to
infer the platform automatically, and so adding that check would require
updating dozens of test files.

Reviewed By: #lld-macho, thakis, alexshap

Differential Revision: https://reviews.llvm.org/D97209

lld/MachO/InputFiles.cpp

@@ -66,6 +66,7 @@
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/TarWriter.h"
+#include "llvm/TextAPI/MachO/Architecture.h"
 
 using namespace llvm;
 using namespace llvm::MachO;
@@ -474,6 +475,15 @@ ObjFile::ObjFile(MemoryBufferRef mb, uint32_t modTime, StringRef archiveName)
   auto *buf = reinterpret_cast<const uint8_t *>(mb.getBufferStart());
   auto *hdr = reinterpret_cast<const mach_header_64 *>(mb.getBufferStart());
 
+  MachO::Architecture arch =
+      MachO::getArchitectureFromCpuType(hdr->cputype, hdr->cpusubtype);
+  if (arch != config->arch) {
+    error(toString(this) + " has architecture " + getArchitectureName(arch) +
+          " which is incompatible with target architecture " +
+          getArchitectureName(config->arch));
+    return;
+  }
+
   if (const load_command *cmd = findCommand(hdr, LC_LINKER_OPTION)) {
     auto *c = reinterpret_cast<const linker_option_command *>(cmd);
     StringRef data{reinterpret_cast<const char *>(c + 1),
@@ -672,6 +682,12 @@ DylibFile::DylibFile(const InterfaceFile &interface, DylibFile *umbrella,
   if (umbrella == nullptr)
     umbrella = this;
 
+  if (!interface.getArchitectures().has(config->arch)) {
+    error(toString(this) + " is incompatible with " +
+          getArchitectureName(config->arch));
+    return;
+  }
+
   dylibName = saver.save(interface.getInstallName());
   compatibilityVersion = interface.getCompatibilityVersion().rawValue();
   currentVersion = interface.getCurrentVersion().rawValue();

lld/test/MachO/Inputs/MacOSX.sdk/usr/lib/libc++.tbd

@@ -1,5 +1,5 @@
 --- !tapi-tbd-v3
-archs:            [ i386, x86_64 ]
+archs:            [ i386, x86_64, arm64 ]
 uuids:            [ 'i386: 00000000-0000-0000-0000-000000000000', 'x86_64: 00000000-0000-0000-0000-000000000001', 'arm64: 00000000-0000-0000-0000-000000000002' ]
 platform:         macosx
 install-name:     '/usr/lib/libc++.dylib'

lld/test/MachO/header.s

@@ -1,10 +1,11 @@
 # REQUIRES: x86, arm
 # RUN: rm -rf %t && mkdir -p %t
-# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t/test.o
-# RUN: %lld -arch x86_64 -platform_version macos 10.5.0 11.0 -o %t/x86-64-executable %t/test.o
-# RUN: %lld -arch arm64 -o %t/arm64-executable %t/test.o
-# RUN: %lld -arch x86_64 -dylib -o %t/x86-64-dylib %t/test.o
-# RUN: %lld -arch arm64  -dylib -o %t/arm64-dylib %t/test.o
+# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t/x86_64-test.o
+# RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin %s -o %t/arm64-test.o
+# RUN: %lld -arch x86_64 -platform_version macos 10.5.0 11.0 -o %t/x86-64-executable %t/x86_64-test.o
+# RUN: %lld -arch arm64 -o %t/arm64-executable %t/arm64-test.o
+# RUN: %lld -arch x86_64 -dylib -o %t/x86-64-dylib %t/x86_64-test.o
+# RUN: %lld -arch arm64  -dylib -o %t/arm64-dylib %t/arm64-test.o
 
 # RUN: llvm-objdump --macho --all-headers %t/x86-64-executable | FileCheck %s -DCAPS=LIB64
 # RUN: llvm-objdump --macho --all-headers %t/arm64-executable | FileCheck %s -DCAPS=0x00

lld/test/MachO/invalid/Inputs/libincompatible.tbd

@@ -0,0 +1,9 @@
+--- !tapi-tbd-v3
+archs:            [ arm64 ]
+uuids:            [ 'arm64: 00000000-0000-0000-0000-000000000000' ]
+platform:         macosx
+install-name:     '/usr/lib/libincompatible.dylib'
+current-version:  0001.001.1
+exports:
+  - archs:        [ 'x86_64', 'arm64' ]
+    symbols:      [ ]

lld/test/MachO/invalid/incompatible-arch-tapi.s

@@ -0,0 +1,9 @@
+# RUN: rm -rf %t; split-file %s %t
+# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-macosx %t/main.s -o %t/main.o
+# RUN: not %lld -arch x86_64 -lSystem %S/Inputs/libincompatible.tbd %t/main.o -o /dev/null 2>&1 | FileCheck %s --check-prefix=ARCH
+# ARCH: error: {{.*}}libincompatible.tbd is incompatible with x86_64
+
+#--- main.s
+.globl _main
+_main:
+  ret

lld/test/MachO/invalid/incompatible-arch.s

@@ -0,0 +1,7 @@
+# RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin %s -o %t.o
+# RUN: not %lld -arch x86_64 -lSystem %t.o -o /dev/null 2>&1 | FileCheck %s -DFILE=%t.o
+# CHECK: error: {{.*}}[[FILE]] has architecture arm64 which is incompatible with target architecture x86_64
+
+.globl _main
+_main:
+  ret