[PATCH] D19630: Debug info: Support DWARF4 bitfields via DW_AT_data_bit_offset.

[Adrian Prantl via llvm-commits]

aprantl created this revision.
aprantl added reviewers: echristo, dblaikie, probinson.
aprantl added subscribers: clayborg, llvm-commits.
aprantl set the repository for this revision to rL LLVM.
Herald added a subscriber: joker.eph.

    The DWARF2 specification of DW_AT_bit_offset was written from the perspective of
    a big-endian machine with unclear semantics for other systems.  DWARF4
    deprecated DW_AT_bit_offset and introduced a new attribute DW_AT_data_bit_offset
    that simply counts the number of bits from the beginning of the containing
    entity regardless of endianness.
    
    After this patch LLVM emits DW_AT_bit_offset for DWARF 2 or 3 and
    DW_AT_data_bit_offset when DWARF 4 or later is requested.

Any caveats from any non-LLDB platform maintainers?

Repository:
  rL LLVM

http://reviews.llvm.org/D19630

Files:
  lib/CodeGen/AsmPrinter/DwarfUnit.cpp
  test/DebugInfo/ARM/big-endian-bitfield.ll
  test/DebugInfo/X86/bitfields-dwarf4.ll

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