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| author | Leonard Grey <lgrey@chromium.org> | 2022-01-12 09:12:53 -0500 |
|---|---|---|
| committer | Nico Weber <thakis@chromium.org> | 2022-01-12 09:22:26 -0500 |
| commit | 0f853930042f11f5ee489bd56b48a227d057c37e (patch) | |
| tree | 8c57e4e20fe58a233d37c3186beb3ead4aa899bf /llvm/lib/MC/MachObjectWriter.cpp | |
| parent | 732ad8ea62edc403727af57537b5d83dcfa937aa (diff) | |
| download | llvm-0f853930042f11f5ee489bd56b48a227d057c37e.zip llvm-0f853930042f11f5ee489bd56b48a227d057c37e.tar.gz llvm-0f853930042f11f5ee489bd56b48a227d057c37e.tar.bz2 | |
[MachO] Port call graph profile section and directive
This ports the `.cg_profile` assembly directive and call graph profile section
generation to MachO from COFF/ELF. Due to MachO section naming rules, the
section is called `__LLVM,__cg_profile` rather than `.llvm.call-graph-profile`
as in COFF/ELF. Support for llvm-readobj is included to facilitate testing.
Corresponding LLD change is D112164
Differential Revision: https://reviews.llvm.org/D112160
Diffstat (limited to 'llvm/lib/MC/MachObjectWriter.cpp')
| -rw-r--r-- | llvm/lib/MC/MachObjectWriter.cpp | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/llvm/lib/MC/MachObjectWriter.cpp b/llvm/lib/MC/MachObjectWriter.cpp index 16941b1..5105c5d 100644 --- a/llvm/lib/MC/MachObjectWriter.cpp +++ b/llvm/lib/MC/MachObjectWriter.cpp @@ -759,6 +759,23 @@ uint64_t MachObjectWriter::writeObject(MCAssembler &Asm, computeSymbolTable(Asm, LocalSymbolData, ExternalSymbolData, UndefinedSymbolData); + if (!Asm.CGProfile.empty()) { + MCSection *CGProfileSection = Asm.getContext().getMachOSection( + "__LLVM", "__cg_profile", 0, SectionKind::getMetadata()); + MCDataFragment *Frag = dyn_cast_or_null<MCDataFragment>( + &*CGProfileSection->getFragmentList().begin()); + assert(Frag && "call graph profile section not reserved"); + Frag->getContents().set_size(0); + raw_svector_ostream OS(Frag->getContents()); + for (const MCAssembler::CGProfileEntry &CGPE : Asm.CGProfile) { + uint32_t FromIndex = CGPE.From->getSymbol().getIndex(); + uint32_t ToIndex = CGPE.To->getSymbol().getIndex(); + support::endian::write(OS, FromIndex, W.Endian); + support::endian::write(OS, ToIndex, W.Endian); + support::endian::write(OS, CGPE.Count, W.Endian); + } + } + unsigned NumSections = Asm.size(); const MCAssembler::VersionInfoType &VersionInfo = Layout.getAssembler().getVersionInfo(); |