[all-commits] [llvm/llvm-project] 5041d0: [MC] Fix DWARF file table for files with empty DWA...

[Aleksei Vetrov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5041d067307344effbab41cf96d5603652b2e718
      https://github.com/llvm/llvm-project/commit/5041d067307344effbab41cf96d5603652b2e718
  Author: Aleksei Vetrov <vetaleha at gmail.com>
  Date:   2024-12-10 (Tue, 10 Dec 2024)

  Changed paths:
    M llvm/lib/MC/MCParser/AsmParser.cpp
    A llvm/test/MC/ELF/debug-hash-file-empty-dwarf.s

  Log Message:
  -----------
  [MC] Fix DWARF file table for files with empty DWARF (#119020) (#119229)

Update root file in DWARF file/line table as soon as we see the first
"#line" directive.

This was moved from "enabledGenDwarfForAssembly", which is called right
before we emit DWARF information. But if the file is empty or contains
expressions that doesn't need DWARF, it is never called, leaving an
original root file and not the file in the "#line" directive.

Add a test checking for this case.

Fixes: #119020



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