[llvm-branch-commits] [clang] release/20.x: Reduce memory usage in AST parent map generation by lazily checking if nodes have been seen (#129934) (PR #131209)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (llvmbot)

<details>
<summary>Changes</summary>

Backport 8c7f0eaa6ee3f84e3d8260535cced234bed4fa28

Requested by: @<!-- -->higher-performance

---
Full diff: https://github.com/llvm/llvm-project/pull/131209.diff


1 Files Affected:

- (modified) clang/lib/AST/ParentMapContext.cpp (+11-6) 


``````````diff
diff --git a/clang/lib/AST/ParentMapContext.cpp 
b/clang/lib/AST/ParentMapContext.cpp
index 7ff492443031d..d8dd352c42d6b 100644
--- a/clang/lib/AST/ParentMapContext.cpp
+++ b/clang/lib/AST/ParentMapContext.cpp
@@ -12,10 +12,11 @@
 
//===----------------------------------------------------------------------===//
 
 #include "clang/AST/ParentMapContext.h"
-#include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/Expr.h"
+#include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/AST/TemplateBase.h"
+#include "llvm/ADT/SmallPtrSet.h"
 
 using namespace clang;
 
@@ -69,17 +70,21 @@ class ParentMapContext::ParentMap {
       for (; N > 0; --N)
         push_back(Value);
     }
-    bool contains(const DynTypedNode &Value) {
-      return Seen.contains(Value);
+    bool contains(const DynTypedNode &Value) const {
+      const void *Identity = Value.getMemoizationData();
+      assert(Identity);
+      return Dedup.contains(Identity);
     }
     void push_back(const DynTypedNode &Value) {
-      if (!Value.getMemoizationData() || Seen.insert(Value).second)
+      const void *Identity = Value.getMemoizationData();
+      if (!Identity || Dedup.insert(Identity).second) {
         Items.push_back(Value);
+      }
     }
     llvm::ArrayRef<DynTypedNode> view() const { return Items; }
   private:
-    llvm::SmallVector<DynTypedNode, 2> Items;
-    llvm::SmallDenseSet<DynTypedNode, 2> Seen;
+    llvm::SmallVector<DynTypedNode, 1> Items;
+    llvm::SmallPtrSet<const void *, 2> Dedup;
   };
 
   /// Maps from a node to its parents. This is used for nodes that have

``````````

</details>


https://github.com/llvm/llvm-project/pull/131209
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