[all-commits] [llvm/llvm-project] 0668bb: [ctxprof] Track unhandled call targets (#131417)

[Mircea Trofin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0668bb28cc98202f1ae252fb0357b2f1043bdbe7
      https://github.com/llvm/llvm-project/commit/0668bb28cc98202f1ae252fb0357b2f1043bdbe7
  Author: Mircea Trofin <mtrofin at google.com>
  Date:   2025-03-19 (Wed, 19 Mar 2025)

  Changed paths:
    M compiler-rt/lib/ctx_profile/CtxInstrContextNode.h
    M compiler-rt/lib/ctx_profile/CtxInstrProfiling.cpp
    M compiler-rt/lib/ctx_profile/CtxInstrProfiling.h
    M compiler-rt/lib/ctx_profile/tests/CtxInstrProfilingTest.cpp
    M compiler-rt/test/ctx_profile/TestCases/generate-context.cpp
    M llvm/include/llvm/ProfileData/CtxInstrContextNode.h
    M llvm/include/llvm/ProfileData/PGOCtxProfReader.h
    M llvm/include/llvm/ProfileData/PGOCtxProfWriter.h
    M llvm/lib/ProfileData/PGOCtxProfReader.cpp
    M llvm/lib/ProfileData/PGOCtxProfWriter.cpp
    M llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
    A llvm/test/tools/llvm-ctxprof-util/Inputs/valid-with-unhandled.yaml
    M llvm/test/tools/llvm-ctxprof-util/llvm-ctxprof-util.test
    M llvm/unittests/ProfileData/PGOCtxProfReaderWriterTest.cpp

  Log Message:
  -----------
  [ctxprof] Track unhandled call targets (#131417)

Collect profiles for functions we encounter when collecting a contextual profile, that are not associated with a call site. This is expected to happen for signal handlers, but it also - problematically - currently happens for mem{memset|copy|move|set}, which are currently inserted after profile instrumentation.

Collecting a "regular" flat profile in these cases would hide the problem - that we loose better profile opportunities.



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