Steven Wu 1b8db068ed [PrefixMap] Teach lldb to auto-load compilation-prefix-map.json (#187145) ...

Add a LoadCompilationPrefixMap() helper in SymbolFile::FindPlugin that
walks up from the symbol file's directory looking for a
compilation-prefix-map.json file. When found, each key→value entry is
applied to the module's source path mapping list, allowing LLDB to
resolve source file paths that were rewritten by -fdebug-prefix-map at
build time without requiring manual `settings set target.source-map`.

The JSON file format maps fake paths (as written into debug info) back
to their real on-disk counterparts:
  { "/fake/srcdir": "/real/srcdir" }

Directory results are cached so the filesystem is walked at most once
per unique directory across all modules loaded in a session.

Also apply the module's source path remappings in
SymbolFileDWARFDebugMap::ParseCompileUnitAtIndex when constructing
compile units from N_SO stabs. This mirrors what MakeAbsoluteAndRemap
does for the dSYM case so that fake paths baked into the debug map are
transparently resolved to real paths.

rdar://84824567

Assisted-By: Claude

2026-03-18 09:11:28 -07:00

10 KiB

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