[clang] [clang][bytecode] Check dtor calls for one-past-end pointers (PR #140047)
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Thu May 15 05:36:03 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang
Author: Timm Baeder (tbaederr)
<details>
<summary>Changes</summary>
---
Full diff: https://github.com/llvm/llvm-project/pull/140047.diff
2 Files Affected:
- (modified) clang/lib/AST/ByteCode/Interp.cpp (+2)
- (modified) clang/test/AST/ByteCode/cxx20.cpp (+8)
``````````diff
diff --git a/clang/lib/AST/ByteCode/Interp.cpp b/clang/lib/AST/ByteCode/Interp.cpp
index fbe04fe3231dd..74efc3c914504 100644
--- a/clang/lib/AST/ByteCode/Interp.cpp
+++ b/clang/lib/AST/ByteCode/Interp.cpp
@@ -1375,6 +1375,8 @@ bool CheckDestructor(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
return false;
if (!CheckTemporary(S, OpPC, Ptr, AK_Destroy))
return false;
+ if (!CheckRange(S, OpPC, Ptr, AK_Destroy))
+ return false;
// Can't call a dtor on a global variable.
if (Ptr.block()->isStatic()) {
diff --git a/clang/test/AST/ByteCode/cxx20.cpp b/clang/test/AST/ByteCode/cxx20.cpp
index 5f62a5648bab7..0b2234ef83298 100644
--- a/clang/test/AST/ByteCode/cxx20.cpp
+++ b/clang/test/AST/ByteCode/cxx20.cpp
@@ -1007,3 +1007,11 @@ namespace TempDtor {
a_ref.~A(); // both-note {{destruction of temporary is not allowed in a constant expression outside the expression that created the temporary}}
}
}
+
+namespace OnePastEndDtor {
+ struct A {int n; };
+ constexpr void destroy_past_end() { // both-error {{never produces a constant expression}}
+ A a;
+ (&a+1)->~A(); // both-note {{destruction of dereferenced one-past-the-end pointer}}
+ }
+}
``````````
</details>
https://github.com/llvm/llvm-project/pull/140047
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