[all-commits] [llvm/llvm-project] cc7308: [ctx_prof] Make the profile output analyzable by l...

[Mircea Trofin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cc7308a1563e5ebab4dffeb85deefdde61e6711a
      https://github.com/llvm/llvm-project/commit/cc7308a1563e5ebab4dffeb85deefdde61e6711a
  Author: Mircea Trofin <mtrofin at google.com>
  Date:   2024-07-23 (Tue, 23 Jul 2024)

  Changed paths:
    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/unittests/ProfileData/PGOCtxProfReaderWriterTest.cpp

  Log Message:
  -----------
  [ctx_prof] Make the profile output analyzable by llvm-bcanalyzer (#99563)

This requires output-ing a "Magic" 4-byte header. We also emit a block info block, to describe our blocks and records. The output of `llvm-bcanalyzer` would look like:

```
<BLOCKINFO_BLOCK/>
<Metadata NumWords=17 BlockCodeSize=2>
  <Version op0=1/>
  <Context NumWords=13 BlockCodeSize=2>
    <GUID op0=2/>
    <Counters op0=1 op1=2 op2=3/>
```

Instead of having `Unknown` for block and record IDs.



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