[PATCH] D147506: [DebugLine] save one debug line entry for empty prologue

[ChenZheng via Phabricator via llvm-commits]

shchenz created this revision.
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Some debuggers like DBX on AIX assume the address in debug line entries is always incremental. But clang generates two entries (entry for file scope line and entry for prologue end) with same address if prologue is empty

And if the prologue is empty, seems the first debug line entry for the function is unnecessary(i.e. removing the first entry won't impact the behavior in GDB on Linux), so I implement this for all debuggers.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147506

Files:
  llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/combine-shift-of-shifted-dbg-value-fallback.ll
  llvm/test/DebugInfo/XCOFF/empty-prolog.ll
  llvm/test/DebugInfo/XCOFF/explicit-section.ll
  llvm/test/DebugInfo/XCOFF/function-sections.ll
  llvm/test/MC/WebAssembly/debug-info.ll
  llvm/test/MC/WebAssembly/debug-info64.ll

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