[all-commits] [llvm/llvm-project] 7a930c: [DWARF] Emit a minimal line-table for totally empt...

[Jeremy Morse via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7a930ce327fdbc5c77b50ee6304645084100c037
      https://github.com/llvm/llvm-project/commit/7a930ce327fdbc5c77b50ee6304645084100c037
  Author: Jeremy Morse <jeremy.morse at sony.com>
  Date:   2024-09-09 (Mon, 09 Sep 2024)

  Changed paths:
    M llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
    M llvm/test/CodeGen/PowerPC/aix-xcoff-exception-section-debug.ll
    M llvm/test/CodeGen/X86/pseudo_cmov_lower2.ll
    A llvm/test/DebugInfo/X86/empty-line-info.ll

  Log Message:
  -----------
  [DWARF] Emit a minimal line-table for totally empty functions (#107267)

In degenerate but legal inputs, we can have functions that have no source
locations at all -- all the DebugLocs attached to instructions are empty.
LLVM didn't produce any source location for the function; with this patch
it will at least emit the function-scope source location. Demonstrated by
empty-line-info.ll

The XCOFF test modified has similar symptoms -- with this patch, the size
of the ".dwline" section grows a bit, thus shifting some of the file
internal offsets, which I've updated.



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