[flang-commits] [flang] [flang] improve DITypeAttr caching with recursive derived types (PR #146543)

[Abid Qadeer via flang-commits]

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@@ -272,31 +271,127 @@ DebugTypeGenerator::getFieldSizeAndAlign(mlir::Type fieldTy) {
   return std::pair{byteSize, byteAlign};
 }
 
+mlir::LLVM::DITypeAttr DerivedTypeCache::lookup(mlir::Type type) {
+  auto iter = typeCache.find(type);
+  if (iter != typeCache.end()) {
+    if (iter->second.first) {
+      componentActiveRecursionLevels = iter->second.second;
+    }
+    return iter->second.first;
+  }
+  return nullptr;
+}
+
+DerivedTypeCache::ActiveLevels
+DerivedTypeCache::startTranslating(mlir::Type type,
+                                   mlir::LLVM::DITypeAttr placeHolder) {
+  derivedTypeDepth++;
+  if (!placeHolder)
+    return {};
+  typeCache[type] = std::pair<mlir::LLVM::DITypeAttr, ActiveLevels>(
+      placeHolder, {derivedTypeDepth});
+  return {};
+}
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abidh wrote:

This function always returns an empty list. 

https://github.com/llvm/llvm-project/pull/146543