[DebugMetadata][DwarfDebug] Support function-local types in lexical block scopes (4/7)

RFC https://discourse.llvm.org/t/rfc-dwarfdebug-fix-and-improve-handling-imported-entities-types-and-static-local-in-subprogram-and-lexical-block-scopes/68544

Similar to imported declarations, the patch tracks function-local types in
DISubprogram's 'retainedNodes' field. DwarfDebug is adjusted in accordance with
the aforementioned metadata change and provided a support of function-local
types scoped within a lexical block.

The patch assumes that DICompileUnit's 'enums field' no longer tracks local
types and DwarfDebug would assert if any locally-scoped types get placed there.

Reviewed By: jmmartinez

Differential Revision: https://reviews.llvm.org/D144006

1 files changed, 10 insertions, 1 deletions

diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index 48b5501..f95388c 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -267,6 +267,12 @@ void DebugInfoFinder::processSubprogram(DISubprogram *SP) {
       processType(TVal->getType());
     }
   }
+
+  for (auto *N : SP->getRetainedNodes()) {
+    if (auto *Var = dyn_cast<DILocalVariable>(N)) {
+      processLocalVariable(Var);
+    }
+  }
 }
 
 void DebugInfoFinder::processVariable(const Module &M,
@@ -275,7 +281,10 @@ void DebugInfoFinder::processVariable(const Module &M,
   if (!N)
     return;
 
-  auto *DV = dyn_cast<DILocalVariable>(N);
+  processLocalVariable(dyn_cast<DILocalVariable>(N));
+}
+
+void DebugInfoFinder::processLocalVariable(DILocalVariable *DV) {
   if (!DV)
     return;