[all-commits] [llvm/llvm-project] d27cbf: [JITLink] Skip debug sections in MachO objects.

[lhames via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: d27cbf03cf9c43b4b98f031d63f23cfcfe3d587a
      https://github.com/llvm/llvm-project/commit/d27cbf03cf9c43b4b98f031d63f23cfcfe3d587a
  Author: Lang Hames <lhames at gmail.com>
  Date:   2020-06-03 (Wed, 03 Jun 2020)

  Changed paths:
    M llvm/lib/ExecutionEngine/JITLink/MachOLinkGraphBuilder.cpp
    M llvm/lib/ExecutionEngine/JITLink/MachOLinkGraphBuilder.h
    M llvm/lib/ExecutionEngine/JITLink/MachO_arm64.cpp
    M llvm/lib/ExecutionEngine/JITLink/MachO_x86_64.cpp
    A llvm/test/ExecutionEngine/JITLink/X86/MachO_skip_debug_sections.s

  Log Message:
  -----------
  [JITLink] Skip debug sections in MachO objects.

Debug sections will not be linked into the final executable and may contain
ambiguous relocations*. Skipping them avoids both some unnecessary processing
cost and the hassle of dealing with the problematic relocations.

* E.g. __debug_ranges contains non-extern relocations to the end of functions
hat begin with named symbols. Under the usual rules for interpreting non-extern
relocations these will be incorrectly associated with the following block, or
no block at all (if there is a gap between one block and the next).