[all-commits] [llvm/llvm-project] 4914c9: [SantizerCoverage] handle missing DBG MD when inse...

[Nick Desaulniers via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4914c9836765532ffaec9c85bc57690dbdaeb50f
      https://github.com/llvm/llvm-project/commit/4914c9836765532ffaec9c85bc57690dbdaeb50f
  Author: Nick Desaulniers <ndesaulniers at google.com>
  Date:   2021-04-12 (Mon, 12 Apr 2021)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
    A llvm/test/Instrumentation/SanitizerCoverage/crit-edge-sancov.ll

  Log Message:
  -----------
  [SantizerCoverage] handle missing DBG MD when inserting libcalls

Instruction::getDebugLoc can return an invalid DebugLoc. For such cases
where metadata was accidentally removed from the libcall insertion
point, simply insert a DILocation with line 0 scoped to the caller. When
we can inline the libcall, such as during LTO, then we won't fail a
Verifier check that all calls to functions with debug metadata
themselves must have debug metadata.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D100158