[clang] [clang][Interp] Ignore ObjCBoxedExpr subexpr... (PR #102136)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

<details>
<summary>Changes</summary>

... if it can't be expressed as a constant initializer.

---
Full diff: https://github.com/llvm/llvm-project/pull/102136.diff


2 Files Affected:

- (modified) clang/lib/AST/Interp/Compiler.cpp (+3-2) 
- (modified) clang/test/AST/Interp/objc.mm (+25) 


``````````diff
diff --git a/clang/lib/AST/Interp/Compiler.cpp b/clang/lib/AST/Interp/Compiler.cpp
index 02cbe38f5fb1f..95f4fe9bd0bec 100644
--- a/clang/lib/AST/Interp/Compiler.cpp
+++ b/clang/lib/AST/Interp/Compiler.cpp
@@ -3161,10 +3161,11 @@ bool Compiler<Emitter>::VisitExtVectorElementExpr(
 
 template <class Emitter>
 bool Compiler<Emitter>::VisitObjCBoxedExpr(const ObjCBoxedExpr *E) {
+  const Expr *SubExpr = E->getSubExpr();
   if (!E->isExpressibleAsConstantInitializer())
-    return this->emitInvalid(E);
+    return this->discard(SubExpr) && this->emitInvalid(E);
 
-  return this->delegate(E->getSubExpr());
+  return this->delegate(SubExpr);
 }
 
 template <class Emitter>
diff --git a/clang/test/AST/Interp/objc.mm b/clang/test/AST/Interp/objc.mm
index 6402c8ae098fd..f6c4ba12dc5d1 100644
--- a/clang/test/AST/Interp/objc.mm
+++ b/clang/test/AST/Interp/objc.mm
@@ -11,3 +11,28 @@ @interface NSString
 @end
 constexpr NSString *t0 = @"abc";
 constexpr NSString *t1 = @("abc");
+
+
+#if __LP64__
+typedef unsigned long NSUInteger;
+typedef long NSInteger;
+#else
+typedef unsigned int NSUInteger;
+typedef int NSInteger;
+#endif
+
+
+ at class NSNumber;
+
+
+ at interface NSObject
++ (NSObject*)nsobject;
+ at end
+
+ at interface NSNumber : NSObject
++ (NSNumber *)numberWithInt:(int)value;
+ at end
+
+int main(void) {
+  NSNumber *bv = @(1391126400 * 1000); // both-warning {{overflow in expression; result is -443'003'904 with type 'int'}}
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/102136