[clang] [LifetimeSafety] Detect use-after-return (PR #165370)

[Kashika Akhouri via cfe-commits]

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@@ -2808,6 +2808,17 @@ class LifetimeSafetyReporterImpl : public LifetimeSafetyReporter {
         << UseExpr->getEndLoc();
   }
 
+  void reportUseAfterReturn(const Expr *IssueExpr, const Expr *EscapeExpr,
+                            SourceLocation ExpiryLoc, Confidence C) override {
+    S.Diag(IssueExpr->getExprLoc(),
+           C == Confidence::Definite
+               ? diag::warn_lifetime_safety_return_stack_addr_permissive
+               : diag::warn_lifetime_safety_return_stack_addr_strict)
+        << IssueExpr->getEndLoc();
+
+    S.Diag(EscapeExpr->getBeginLoc(), diag::note_lifetime_safety_returned_here);
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kashika0112 wrote:

Done

https://github.com/llvm/llvm-project/pull/165370