[PATCH] D38135: [dwarfdump] Skip 'stripped' sections

[Jonas Devlieghere via Phabricator via llvm-commits]

JDevlieghere created this revision.

When dsymutil generates the companion file, its strips all unnecessary
sections by omitting their body and setting the offset in their
corresponding load command to zero.

One such section is the .eh_frame section, as it contains runtime
information rather than debug information and is part of the __TEXT
segment. When reading this section, we would just read the number of
bytes specified in the load command, starting from offset 0 (i.e. the
beginning of the file).

Rather than trying to parse this obviously invalid section, dwarfdump
now skips this.

PS: The same thing occurs for tools like objdump when trying to dump or
disassemble stripped sections in the __TEXT segment. I will address this
in a separate patch.


Repository:
  rL LLVM

https://reviews.llvm.org/D38135

Files:
  include/llvm/Object/MachO.h
  include/llvm/Object/ObjectFile.h
  lib/DebugInfo/DWARF/DWARFContext.cpp
  lib/Object/MachOObjectFile.cpp
  lib/Object/ObjectFile.cpp
  test/tools/llvm-dwarfdump/X86/Inputs/foo.c
  test/tools/llvm-dwarfdump/X86/stripped.test

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D38135.116188.patch
Type: text/x-patch
Size: 3997 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20170921/4d58b7ea/attachment.bin>