[all-commits] [llvm/llvm-project] cbfc10: Fix lld crash caused by dynamic bit offset patch (...

[Tom Tromey via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cbfc10260cfeab7ede763bffad4c71d9ae20abd2
      https://github.com/llvm/llvm-project/commit/cbfc10260cfeab7ede763bffad4c71d9ae20abd2
  Author: Tom Tromey <tromey at adacore.com>
  Date:   2025-07-02 (Wed, 02 Jul 2025)

  Changed paths:
    A lld/test/ELF/lto/lazy-debug.ll
    M llvm/lib/Bitcode/Reader/MetadataLoader.cpp

  Log Message:
  -----------
  Fix lld crash caused by dynamic bit offset patch (#146701)

PR #141106 changed the debuginfo metdata to allow dynamic bit offsets
and sizes. This caused a crash in lld when using LTO.

The problem is that lazyLoadOneMetadata assumes that the metadata in
question can be cast to MDNode; but in the typical case where the offset
is a constant, this is not true.

This patch changes this spot to allow non-MDNodes through.

The included test case comes from the report in #141106.



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