[all-commits] [llvm/llvm-project] 7fb9bc: [dsymutil] Add option to print statistics about th...

[Jonas Devlieghere via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 7fb9bcd3da64fee7b1116d703beb5db9ef2473bc
      https://github.com/llvm/llvm-project/commit/7fb9bcd3da64fee7b1116d703beb5db9ef2473bc
  Author: Jonas Devlieghere <jonas at devlieghere.com>
  Date:   2020-05-06 (Wed, 06 May 2020)

  Changed paths:
    M llvm/docs/CommandGuide/dsymutil.rst
    M llvm/include/llvm/DWARFLinker/DWARFLinker.h
    M llvm/lib/DWARFLinker/DWARFLinker.cpp
    A llvm/test/tools/dsymutil/X86/statistics.test
    M llvm/test/tools/dsymutil/cmdline.test
    M llvm/tools/dsymutil/DwarfLinkerForBinary.cpp
    M llvm/tools/dsymutil/LinkUtils.h
    M llvm/tools/dsymutil/Options.td
    M llvm/tools/dsymutil/dsymutil.cpp

  Log Message:
  -----------
  [dsymutil] Add option to print statistics about the .debug_info size.

This patch adds statistics about the contribution of each object file to
the linked debug info. When --statistics is passed to dsymutil, it
prints a table after linking as illustrated below.

It lists the object file name, the size of the debug info in the object
file in bytes, and the absolute size contribution to the linked dSYM and
the percentage difference. The table is sorted by the output size, so
the object files contributing the most to the link are listed first.

.debug_info section size (in bytes)
-------------------------------------------------------------------------------
Filename                                           Object         dSYM   Change
-------------------------------------------------------------------------------
basic2.macho.x86_64.o                                210b         165b  -24.00%
basic3.macho.x86_64.o                                177b         150b  -16.51%
basic1.macho.x86_64.o                                125b         129b    3.15%
-------------------------------------------------------------------------------
Total                                                512b         444b  -14.23%
-------------------------------------------------------------------------------

Differential revision: https://reviews.llvm.org/D79513