Javier Lopez-Gomez 211ee04a61 [llvm-debuginfo-analyzer] Fix a couple of unhandled DWARF situations leading to a crash (#137221) ...

This pull request fixes a couple of unhandled situations in DWARF input
leading to a crash. Specifically,

- If the DWARF input contains a declaration of a C variadic function
(where `...` translates to `DW_TAG_unspecified_parameters`), which is
then followed by a definition, `llvm_unreachable()` is hit in
`LVScope::addMissingElements()`. This is only visible in Debug builds.

- Parsing of instructions in `LVBinaryReader::createInstructions()` does
not check whether `Offset` lies within the `Bytes` ArrayRef. A specially
crafted DWARF input can lead to this condition.

2025-05-21 05:29:41 +01:00

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