[PATCH] D130777: Enable embedded lto for XCOFF.

[Sean Fertile via Phabricator via cfe-commits]

sfertile created this revision.
sfertile added reviewers: hubert.reinterpretcast, DiggerLin, nemanjai, MaskRay, tejohnson, mehdi_amini, phosek, arda.
Herald added subscribers: ormris, StephenFan, steven_wu, kbarton, hiraditya, inglorion, mgorny.
Herald added a project: All.
sfertile requested review of this revision.
Herald added projects: clang, LLVM.
Herald added a subscriber: cfe-commits.

The traditional system compiler (xlc) on AIX uses a 'fat' object format for LTO by default, embedding the intermediate representation into a special '.ipa' section in native XCOFF object files. Then at link time depending on command line options either a native link or an ipa link can be performed. This patch adds support for embedding the pre-link IR into the module which is then codegened to a native XCOFF object with the bitcode emebededed in the .info section. The .info section representation starts with a magic number, followed by an 8-byte size, an identifier string and a 4-byte unsigned difference, finally followed by the payload. The magic number and identifier string indcate to the linker that the embedded metadata is bitcode and it is appropriate for use in LTO.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130777

Files:
  clang/include/clang/Basic/CodeGenOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/CodeGen/BackendUtil.cpp
  clang/lib/Driver/Driver.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/CodeGen/PowerPC/aix-embedded-bitcode.c
  clang/test/CodeGen/embed-lto-metadata.c
  clang/test/Driver/embedded-lto.c
  llvm/include/llvm/Bitcode/EmbedBitcodePass.h
  llvm/include/llvm/MC/MCStreamer.h
  llvm/include/llvm/MC/MCXCOFFStreamer.h
  llvm/lib/Bitcode/Writer/CMakeLists.txt
  llvm/lib/Bitcode/Writer/EmbedBitcodePass.cpp
  llvm/lib/MC/MCAsmStreamer.cpp
  llvm/lib/MC/MCStreamer.cpp
  llvm/lib/Passes/PassBuilder.cpp
  llvm/lib/Passes/PassRegistry.def
  llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
  llvm/test/Bitcode/embed-multiple.ll
  llvm/test/Bitcode/embed-unsupported-object-format.ll
  llvm/test/Bitcode/embed.ll
  llvm/test/CodeGen/PowerPC/aix-embeded-bitcode.ll
  llvm/test/CodeGen/PowerPC/aix-embeded-module-padding.ll
  llvm/test/Transforms/Util/embeded-lto-TLI-mappings.ll

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