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llvm with tablegen backend for capstone disassembler

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Fangrui Song 88f2fe5cad Raland D87318 [LLD][PowerPC] Add support for R_PPC64_GOT_TLSGD_PCREL34 used in TLS General Dynamic Add Thread Local Storage support for the 34 bit relocation R_PPC64_GOT_TLSGD_PCREL34 used in General Dynamic. The compiler will produce code that looks like: ``` pla r3, x@got@tlsgd@pcrel R_PPC64_GOT_TLSGD_PCREL34 bl __tls_get_addr@notoc(x@tlsgd) R_PPC64_TLSGD R_PPC64_REL24_NOTOC ``` LLD should be able to correctly compute the relocation for R_PPC64_GOT_TLSGD_PCREL34 as well as do the following two relaxations where possible: General Dynamic to Local Exec: ``` paddi r3, r13, x@tprel nop ``` and General Dynamic to Initial Exec: ``` pld r3, x@got@tprel@pcrel add r3, r3, r13 ``` Note: This patch adds support for the PC Relative (no TOC) version of General Dynamic on top of the existing support for the TOC version of General Dynamic. The ABI does not provide any way to tell by looking only at the relocation `R_PPC64_TLSGD` when it is being used in a TOC instruction sequence or and when it is being used in a no TOC sequence. The TOC sequence should always be 4 byte aligned. This patch adds one to the offset of the relocation when it is being used in a no TOC sequence. In this way LLD can tell by looking at the alignment of the offset of `R_PPC64_TLSGD` whether or not it is being used as part of a TOC or no TOC sequence. Reviewed By: NeHuang, sfertile, MaskRay Differential Revision: https://reviews.llvm.org/D87318		2020-10-01 12:36:33 -07:00
clang	[CMake][Fuchsia] Don't set WIN32 API, rely on autodetection	2020-10-01 12:35:52 -07:00
clang-tools-extra	Allow to specify macro names for android-comparison-in-temp-failure-retry	2020-10-01 10:09:26 -07:00
compiler-rt	[compiler-rt][cmake][powerpc] Remove TEST_BIG_ENDIAN from base-config-ix.cmake	2020-10-01 09:45:07 -04:00
debuginfo-tests	Add GDB prettyprinters for a few more MLIR types.	2020-09-30 21:22:47 +02:00
flang	[flang] Fix WRITE after BACKSPACE	2020-10-01 10:33:31 -07:00
libc	[libc] Using llvm_libc memcpy in mem* benchmarks.	2020-09-24 22:03:52 -07:00
libclc	libclc: Add a __builtin to let SPIRV targets select between SW and HW FMA	2020-09-16 01:37:22 -04:00
libcxx	[CMake] Use -isystem flag to access libc++ headers	2020-10-01 12:09:27 -07:00
libcxxabi	[libc++] Don't re-export new/delete from libc++abi when they are defined in libc++	2020-10-01 13:31:55 -04:00
libunwind	[AArch64] Add v8.5 Branch Target Identification support.	2020-09-29 15:51:01 +02:00
lld	Raland D87318 [LLD][PowerPC] Add support for R_PPC64_GOT_TLSGD_PCREL34 used in TLS General Dynamic	2020-10-01 12:36:33 -07:00
lldb	[lldb] Add missing import for LLDB test decorators to TestStopHookScripted	2020-10-01 14:33:13 +02:00
llvm	[lit] Fix Python 2/3 compat in new winreg search code	2020-10-01 12:22:28 -07:00
mlir	[mlir][Linalg] NFC : Move fusion on tensors to separate file.	2020-10-01 09:50:37 -07:00
openmp	[OpenMP][libarcher] Allow all possible argument separators in TSAN_OPTIONS	2020-10-01 01:10:13 +02:00
parallel-libs	Reapply "Try enabling -Wsuggest-override again, using add_compile_options instead of add_compile_definitions for disabling it in unittests/ directories."	2020-07-22 17:50:19 -07:00
polly	Revert "[NewPM] Add callbacks to PassBuilder to run before/after parsing a pass"	2020-09-23 18:43:13 -07:00
pstl	[pstl] Support Threading Building Blocks 2020 (oneTBB) for "tbb" parallel backend.	2020-09-14 14:21:54 +03:00
utils/arcanist	Use in-tree clang-format-diff.py as Arcanist linter	2020-04-06 12:02:20 -04:00
.arcconfig	[arcconfig] Default base to previous revision	2020-02-24 16:20:25 -08:00
.arclint	PR46997: don't run clang-format on clang's testcases.	2020-08-04 17:53:25 -07:00
.clang-format
.clang-tidy	- Update .clang-tidy to ignore parameters of main like functions for naming violations in clang and llvm directory	2020-01-31 16:49:45 +00:00
.git-blame-ignore-revs	NFC: Add whitespace-changing revisions to .git-blame-ignore-revs	2020-09-21 20:17:24 -04:00
.gitignore	[NFC] Adding pythonenv* to .gitignore	2020-09-03 22:42:27 -04:00
CONTRIBUTING.md
README.md	Revert "This is a test commit"	2020-09-18 08:43:53 +02:00

README.md

The LLVM Compiler Infrastructure

This directory and its sub-directories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The README briefly describes how to get started with building LLVM. For more information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

Getting Started with the LLVM System

Taken from https://llvm.org/docs/GettingStarted.html.

Overview

Welcome to the LLVM project!

The LLVM project has multiple components. The core of the project is itself called "LLVM". This contains all of the tools, libraries, and header files needed to process intermediate representations and converts it into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer. It also contains basic regression tests.

C-like languages use the Clang front end. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

Getting the Source Code and Building LLVM

The LLVM Getting Started documentation may be out of date. The Clang Getting Started page might have more accurate information.

This is an example work-flow and configuration to get and build the LLVM source:

Checkout LLVM (including related sub-projects like Clang):
- git clone https://github.com/llvm/llvm-project.git
- Or, on windows, git clone --config core.autocrlf=false https://github.com/llvm/llvm-project.git
Configure and build LLVM and Clang:
- cd llvm-project
- mkdir build
- cd build
- cmake -G <generator> [options] ../llvm
  
  Some common build system generators are:
  - Ninja --- for generating Ninja build files. Most llvm developers use Ninja.
  - Unix Makefiles --- for generating make-compatible parallel makefiles.
  - Visual Studio --- for generating Visual Studio projects and solutions.
  - Xcode --- for generating Xcode projects.
  Some Common options:
  - -DLLVM_ENABLE_PROJECTS='...' --- semicolon-separated list of the LLVM sub-projects you'd like to additionally build. Can include any of: clang, clang-tools-extra, libcxx, libcxxabi, libunwind, lldb, compiler-rt, lld, polly, or debuginfo-tests.
    
    For example, to build LLVM, Clang, libcxx, and libcxxabi, use -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi".
  - -DCMAKE_INSTALL_PREFIX=directory --- Specify for directory the full path name of where you want the LLVM tools and libraries to be installed (default /usr/local).
  - -DCMAKE_BUILD_TYPE=type --- Valid options for type are Debug, Release, RelWithDebInfo, and MinSizeRel. Default is Debug.
  - -DLLVM_ENABLE_ASSERTIONS=On --- Compile with assertion checks enabled (default is Yes for Debug builds, No for all other build types).
- cmake --build . [-- [options] <target>] or your build system specified above directly.
  - The default target (i.e. ninja or make) will build all of LLVM.
  - The check-all target (i.e. ninja check-all) will run the regression tests to ensure everything is in working order.
  - CMake will generate targets for each tool and library, and most LLVM sub-projects generate their own check-<project> target.
  - Running a serial build will be slow. To improve speed, try running a parallel build. That's done by default in Ninja; for make, use the option -j NNN, where NNN is the number of parallel jobs, e.g. the number of CPUs you have.
- For more information see CMake

Consult the Getting Started with LLVM page for detailed information on configuring and compiling LLVM. You can visit Directory Layout to learn about the layout of the source code tree.