[llvm] [llvm-symbolizer] Recognize AIX big archive (PR #150401)

[James Henderson via llvm-commits]

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@@ -216,15 +226,39 @@ class LLVMSymbolizer {
   /// Contains parsed binary for each path, or parsing error.
   std::map<std::string, CachedBinary, std::less<>> BinaryForPath;
 
+  /// Store the archive path for the object file.
+  DenseMap<const object::ObjectFile *, std::string> ObjectToArchivePath;
+
   /// A list of cached binaries in LRU order.
   simple_ilist<CachedBinary> LRUBinaries;
   /// Sum of the sizes of the cached binaries.
   size_t CacheSize = 0;
 
-  /// Parsed object file for path/architecture pair, where "path" refers
-  /// to Mach-O universal binary.
-  std::map<std::pair<std::string, std::string>, std::unique_ptr<ObjectFile>>
-      ObjectForUBPathAndArch;
+  struct ContainerCacheKey {
+    std::string Path;
+    std::string MemberName;
+    std::string ArchName;
+
+    // Required for map comparison.
+    bool operator<(const ContainerCacheKey &Other) const {
+      return std::tie(Path, MemberName, ArchName) <
+             std::tie(Other.Path, Other.MemberName, Other.ArchName);
+    }
+  };
+
+  /// Parsed object file for each path/member/architecture triple.
+  /// Used to cache objects extracted from containers (Mach-O universal
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jh7370 wrote:

I'd add an "e.g." before "Mach-O" in case the same technique is used for similar formats in the future.

https://github.com/llvm/llvm-project/pull/150401