[PATCH] D55091: Add --analyze option to llvm-dwarfdump

[Greg Clayton via Phabricator via llvm-commits]

clayborg created this revision.
clayborg added reviewers: aprantl, echristo, dblaikie, vsk.
Herald added subscribers: JDevlieghere, mgorny.

This patch is the start of what will become a detailed analysis of a DWARF file. The patch starts off by adding the infrastructure to analyze a DWARF file and pretty print out the DWARF section sizes and report the sizes along with their percentage of the DWARF size and file size:

  $ llvm-dwarfdump --analyze analyze-dwarf-section-sizes.test.tmp.o
  File: "analyze-dwarf-section-sizes.test.tmp.o"
  Size: 9765 (9.54K)
  DWARF section sizes:
  SIZE    % DWARF % FILE  SECTION NAME
  ------- ------- ------- -------------------------------------
      372  23.65%   3.81% __debug_info
      207  13.16%   2.12% __debug_line
      182  11.57%   1.86% __debug_str
      171  10.87%   1.75% __apple_types
      165  10.49%   1.69% __debug_abbrev
      116   7.37%   1.19% __apple_names
       96   6.10%   0.98% __debug_aranges
       83   5.28%   0.85% __debug_pubnames
       81   5.15%   0.83% __debug_pubtypes
       64   4.07%   0.66% __apple_namespac
       36   2.29%   0.37% __apple_objc
  ======= ======= ======= =====================================
    1.54K 100.00%  16.11% Total DWARF Size

There is also a --json option that will print out JSON:

  $ llvm-dwarfdump --analyze analyze-dwarf-section-sizes.test.tmp.o --json
  {
    "path": "/Users/gclayton/Documents/src/llvm/analyze/llvm/build/test/tools/llvm-dwarfdump/Output/analyze-dwarf-section-sizes.test.tmp.o",
    "sections": [
      {
        "name": "__debug_info",
        "size": 372
      },
      {
        "name": "__debug_line",
        "size": 207
      },
      {
        "name": "__debug_str",
        "size": 182
      },
      {
        "name": "__apple_types",
        "size": 171
      },
      {
        "name": "__debug_abbrev",
        "size": 165
      },
      {
        "name": "__apple_names",
        "size": 116
      },
      {
        "name": "__debug_aranges",
        "size": 96
      },
      {
        "name": "__debug_pubnames",
        "size": 83
      },
      {
        "name": "__debug_pubtypes",
        "size": 81
      },
      {
        "name": "__apple_namespac",
        "size": 64
      },
      {
        "name": "__apple_objc",
        "size": 36
      }
    ],
    "size": 9765
  }

I wanted to keep this patch small so this is all it does for now. Subsequent patches will add debug info size per source directory, type duplication data (how many of each type is duplicated and how much size in bytes are duplicated), and inline information (counts of all inlined functions and code size of the inlined code).


https://reviews.llvm.org/D55091

Files:
  test/tools/llvm-dwarfdump/analyze-dwarf-section-sizes.test
  tools/llvm-dwarfdump/Analyze.cpp
  tools/llvm-dwarfdump/CMakeLists.txt
  tools/llvm-dwarfdump/llvm-dwarfdump.cpp

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