[all-commits] [llvm/llvm-project] 1e4b05: [lldb] Prefer DW_AT_bit_size for DW_OP_convert typ...

[firmiana via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1e4b05a1bb87a8fe3a75eb2960e11afc46c72ebb
      https://github.com/llvm/llvm-project/commit/1e4b05a1bb87a8fe3a75eb2960e11afc46c72ebb
  Author: firmiana <firmiana402 at gmail.com>
  Date:   2026-07-14 (Tue, 14 Jul 2026)

  Changed paths:
    M lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
    M lldb/unittests/Expression/DWARFExpressionTest.cpp

  Log Message:
  -----------
  [lldb] Prefer DW_AT_bit_size for DW_OP_convert type width (#208478)

This PR fixes a DW_OP_convert issue where LLDB derives the conversion
width from DW_AT_byte_size * 8 before considering DW_AT_bit_size,
#208203

For base types that carry both DW_AT_byte_size and DW_AT_bit_size, such
as C _BitInt(31), DW_AT_bit_size describes the actual value width. LLDB
should therefore prefer DW_AT_bit_size when it is present, and only fall
back to DW_AT_byte_size otherwise.


## Tests

Extended DWARFExpression.DW_OP_convert coverage with a base type that
has both DW_AT_byte_size and DW_AT_bit_size, and verifies that the
conversion uses the DW_AT_bit_size width.



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