[PATCH] D65178: WIP: [DWARF] Collect statistics for DW_OP_entry_value

[Vedant Kumar via Phabricator via llvm-commits]

vsk created this revision.
Herald added subscribers: hiraditya, aprantl.
Herald added a project: LLVM.

It might be interesting to see how many parameters with entry_value locations there are compared to how many parameters-with-location there are overall.

I can clean up this patch and push it forward if there's general interest. Here are some numbers from a stage2 RelAsserts build of clang.

  ~/src/builds/llvm-project-master-stage2-RA (0) $ ../llvm-project-master-RA/bin/llvm-dwarfdump --statistics ./bin/clang.dSYM | ppjson
  { 'call site entries': 6113835,
    'file':  'bin/clang.dSYM/Contents/Resources/DWARF/clang',
    'formal params with binary location': 5928235,
    'formal params with binary location containing entry value': 0,
    'formal params with source location': 4200769,
    'formal params with type': 8436986,
    'format':  'Mach-O 64-bit x86-64',
    'inlined funcs with abstract origins': 5859344,
    'inlined functions': 5859344,
    'scope bytes covered': 563026378,
    'scope bytes total': 969630990,
    'source functions': 468524,
    'source functions with location': 468075,
    'source variables': 10246465,
    'total formal params': 8436986,
    'total function size': 65502932,
    'total inlined function size': 48065586,
    'total vars': 1142370,
    'unique source variables': 1408162,
    'variables with location': 6751342,
    'vars with binary location': 710703,
    'vars with source location': 1059166,
    'vars with type': 1142370,
    'version': 3}
  
  (with -femit-debug-entry-values)
  ~/src/builds/param-entry-vals-stage2 (0) $ ../llvm-project-master-RA/bin/llvm-dwarfdump --statistics ./bin/clang.dSYM | ppjson
  { 'call site entries': 6471968,
    'file':  'bin/clang.dSYM/Contents/Resources/DWARF/clang',
    'formal params with binary location': 5928218,
    'formal params with binary location containing entry value': 70017,
    'formal params with source location': 4200754,
    'formal params with type': 8437413,
    'format':  'Mach-O 64-bit x86-64',
    'inlined funcs with abstract origins': 5859331,
    'inlined functions': 5859331,
    'scope bytes covered': 580573865,
    'scope bytes total': 969629704,
    'source functions': 468520,
    'source functions with location': 468071,
    'source variables': 10246437,
    'total formal params': 8437413,
    'total function size': 65502621,
    'total inlined function size': 48065442,
    'total vars': 1142364,
    'unique source variables': 1408152,
    'variables with location': 6751217,
    'vars with binary location': 710704,
    'vars with source location': 1059160,
    'vars with type': 1142364,
    'version': 3}


https://reviews.llvm.org/D65178

Files:
  llvm/include/llvm/DebugInfo/DWARF/DWARFExpression.h
  llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp
  llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
  llvm/tools/llvm-dwarfdump/Statistics.cpp

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