[clang] Propagate the result object location for CXXDefaultInitExpr. (PR #98490)

[Samira Bazuzi via cfe-commits]

https://github.com/bazuzi created https://github.com/llvm/llvm-project/pull/98490

These are not "original initializers"; the single node underneath represents the initializing node.

>From 8f51730d1f4bbca740a01b89780b6ed9bee3c3d7 Mon Sep 17 00:00:00 2001
From: Samira Bazuzi <bazuzi at google.com>
Date: Thu, 11 Jul 2024 09:56:17 -0400
Subject: [PATCH] Propagate the result object location for CXXDefaultInitExpr.

These are not "original initializers"; the single node underneath represents the initializing node.
---
 .../lib/Analysis/FlowSensitive/DataflowEnvironment.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp b/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
index 7c88917faf9c6..f734168e647bd 100644
--- a/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
+++ b/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
@@ -15,6 +15,7 @@
 #include "clang/Analysis/FlowSensitive/DataflowEnvironment.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclCXX.h"
+#include "clang/AST/ExprCXX.h"
 #include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/AST/Stmt.h"
 #include "clang/AST/Type.h"
@@ -414,8 +415,8 @@ class ResultObjectVisitor : public AnalysisASTVisitor<ResultObjectVisitor> {
     // lowest-level AST node that initializes a given object, and nothing
     // below them can initialize the same object (or part of it).
     if (isa<CXXConstructExpr>(E) || isa<CallExpr>(E) || isa<LambdaExpr>(E) ||
-        isa<CXXDefaultArgExpr>(E) || isa<CXXDefaultInitExpr>(E) ||
-        isa<CXXStdInitializerListExpr>(E) || isa<AtomicExpr>(E) ||
+        isa<CXXDefaultArgExpr>(E) || isa<CXXStdInitializerListExpr>(E) ||
+        isa<AtomicExpr>(E) ||
         // We treat `BuiltinBitCastExpr` as an "original initializer" too as
         // it may not even be casting from a record type -- and even if it is,
         // the two objects are in general of unrelated type.
@@ -463,6 +464,11 @@ class ResultObjectVisitor : public AnalysisASTVisitor<ResultObjectVisitor> {
       return;
     }
 
+    if (auto *DIE = dyn_cast<CXXDefaultInitExpr>(E)) {
+      PropagateResultObject(DIE->getExpr(), Loc);
+      return;
+    }
+
     // All other expression nodes that propagate a record prvalue should have
     // exactly one child.
     SmallVector<Stmt *, 1> Children(E->child_begin(), E->child_end());