[PATCH] D142243: [CodeGen] bugfix: ApplyDebugLocation goes out of scope before intended

[Usama Hameed via Phabricator via cfe-commits]

usama54321 created this revision.
Herald added a project: All.
usama54321 requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

rdar://103570533


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142243

Files:
  clang/lib/CodeGen/CodeGenFunction.cpp
  clang/test/CodeGenObjC/objc-arc-ubsan-debugging.m


Index: clang/test/CodeGenObjC/objc-arc-ubsan-debugging.m
===================================================================
--- /dev/null
+++ clang/test/CodeGenObjC/objc-arc-ubsan-debugging.m
@@ -0,0 +1,17 @@
+// RUN: %clang -x objective-c -target arm64-apple-macos12.0 -fobjc-arc -std=gnu99  -O0 -fsanitize=undefined -fsanitize=nullability -c %s -v -g
+#include <Foundation/Foundation.h>
+
+struct A {
+    NSString *a;
+};
+
+ at class B;
+
+ at interface C: NSObject
+ at end
+
+NSArray<C*> * _Nonnull foo(B* bar)
+{
+    struct A a;
+    return nil;
+}
Index: clang/lib/CodeGen/CodeGenFunction.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenFunction.cpp
+++ clang/lib/CodeGen/CodeGenFunction.cpp
@@ -361,17 +361,18 @@
   bool HasOnlyLifetimeMarkers =
       HasCleanups && EHStack.containsOnlyLifetimeMarkers(PrologueCleanupDepth);
   bool EmitRetDbgLoc = !HasCleanups || HasOnlyLifetimeMarkers;
+
+  std::optional<ApplyDebugLocation> OAL;
   if (HasCleanups) {
     // Make sure the line table doesn't jump back into the body for
     // the ret after it's been at EndLoc.
-    std::optional<ApplyDebugLocation> AL;
     if (CGDebugInfo *DI = getDebugInfo()) {
       if (OnlySimpleReturnStmts)
         DI->EmitLocation(Builder, EndLoc);
       else
         // We may not have a valid end location. Try to apply it anyway, and
         // fall back to an artificial location if needed.
-        AL = ApplyDebugLocation::CreateDefaultArtificial(*this, EndLoc);
+        OAL = ApplyDebugLocation::CreateDefaultArtificial(*this, EndLoc);
     }
 
     PopCleanupBlocks(PrologueCleanupDepth);


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