[clang][bytecode] Reject constexpr-unknown values in CheckStore

[tbaederr]

No description provided.

[llvmbot]

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/136279.diff

2 Files Affected:

• (modified) clang/lib/AST/ByteCode/Interp.cpp (+2)
• (modified) clang/test/CodeGen/p0963r3.cpp (+2-2)

diff --git a/clang/lib/AST/ByteCode/Interp.cpp b/clang/lib/AST/ByteCode/Interp.cpp
index 4625154ac353d..b755a072fec88 100644
--- a/clang/lib/AST/ByteCode/Interp.cpp
+++ b/clang/lib/AST/ByteCode/Interp.cpp
@@ -790,6 +790,8 @@ bool CheckStore(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
     return false;
   if (!CheckConst(S, OpPC, Ptr))
     return false;
+  if (!S.inConstantContext() && isConstexprUnknown(Ptr))
+    return false;
   return true;
 }
 
diff --git a/clang/test/CodeGen/p0963r3.cpp b/clang/test/CodeGen/p0963r3.cpp
index 4a5e6c3f5d751..65d33397e6173 100644
--- a/clang/test/CodeGen/p0963r3.cpp
+++ b/clang/test/CodeGen/p0963r3.cpp
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -std=c++2c -verify -emit-llvm -triple=x86_64-pc-linux-gnu %s -o - | FileCheck %s
-// RUN: %clang_cc1 -std=c++2c -verify -fsyntax-only -fexperimental-new-constant-interpreter -triple=x86_64-pc-linux-gnu %s
+// RUN: %clang_cc1 -std=c++2c -verify -emit-llvm -triple=x86_64-pc-linux-gnu %s -o -                                         | FileCheck %s
+// RUN: %clang_cc1 -std=c++2c -verify -emit-llvm -triple=x86_64-pc-linux-gnu %s -o - -fexperimental-new-constant-interpreter | FileCheck %s
 // expected-no-diagnostics
 
 namespace std {