[PATCH] D68351: [profile] Add a mode to continuously sync counter updates to a file

[Vedant Kumar via Phabricator via llvm-commits]

vsk updated this revision to Diff 225959.
vsk added a comment.

Updates:

- Rebase.
- I've added a caveat about the need for a different kind of instrumentation to support continuous mode on Fuchsia/Windows. Based on Petr's experiment, it looks like the current instrumentation is a better fit for Darwin.
- I've contacted the Darwin Runtime team about the possibility of supporting continuous mode + on-line merging mode, using a shared memory object that's mmap'd to disk (mmap() alone appears to be insufficient). If this is feasible, I would prefer to revisit it as a follow-up.

PTAL, thanks.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D68351/new/

https://reviews.llvm.org/D68351

Files:
  clang/docs/SourceBasedCodeCoverage.rst
  clang/lib/Driver/ToolChains/Darwin.cpp
  clang/test/Driver/darwin-ld.c
  compiler-rt/lib/profile/InstrProfData.inc
  compiler-rt/lib/profile/InstrProfiling.h
  compiler-rt/lib/profile/InstrProfilingBuffer.c
  compiler-rt/lib/profile/InstrProfilingFile.c
  compiler-rt/lib/profile/InstrProfilingPort.h
  compiler-rt/lib/profile/InstrProfilingRuntime.cpp
  compiler-rt/lib/profile/InstrProfilingWriter.c
  compiler-rt/test/profile/ContinuousSyncMode/basic.c
  compiler-rt/test/profile/ContinuousSyncMode/darwin-proof-of-concept.c
  compiler-rt/test/profile/ContinuousSyncMode/lit.local.cfg.py
  compiler-rt/test/profile/ContinuousSyncMode/multiple-DSOs.c
  compiler-rt/test/profile/ContinuousSyncMode/pid-substitution.c
  compiler-rt/test/profile/ContinuousSyncMode/set-file-object.c
  compiler-rt/test/profile/ContinuousSyncMode/set-filename.c
  llvm/include/llvm/ProfileData/InstrProfData.inc
  llvm/lib/ProfileData/InstrProfReader.cpp
  llvm/test/tools/llvm-profdata/Inputs/c-general.profraw
  llvm/test/tools/llvm-profdata/c-general.test
  llvm/test/tools/llvm-profdata/raw-32-bits-be.test
  llvm/test/tools/llvm-profdata/raw-32-bits-le.test
  llvm/test/tools/llvm-profdata/raw-64-bits-be.test
  llvm/test/tools/llvm-profdata/raw-64-bits-le.test
  llvm/test/tools/llvm-profdata/raw-two-profiles.test

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