[clang] 16494be - [clang][bytecode] Reject dependent RequiresExprs (#155230)

[via cfe-commits]

Author: Timm Baeder
Date: 2025-08-27T12:04:44+02:00
New Revision: 16494be2e8861ae988cb5decbede1f9242286b92

URL: https://github.com/llvm/llvm-project/commit/16494be2e8861ae988cb5decbede1f9242286b92
DIFF: https://github.com/llvm/llvm-project/commit/16494be2e8861ae988cb5decbede1f9242286b92.diff

LOG: [clang][bytecode] Reject dependent RequiresExprs (#155230)

Fixes #152899

Added: 
    

Modified: 
    clang/lib/AST/ByteCode/Compiler.cpp
    clang/test/AST/ByteCode/cxx2a.cpp

Removed: 
    


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diff  --git a/clang/lib/AST/ByteCode/Compiler.cpp b/clang/lib/AST/ByteCode/Compiler.cpp
index ea6195cc11ef9..8ed9e64f5f8ff 100644
--- a/clang/lib/AST/ByteCode/Compiler.cpp
+++ b/clang/lib/AST/ByteCode/Compiler.cpp
@@ -3895,6 +3895,8 @@ bool Compiler<Emitter>::VisitCXXUuidofExpr(const CXXUuidofExpr *E) {
 template <class Emitter>
 bool Compiler<Emitter>::VisitRequiresExpr(const RequiresExpr *E) {
   assert(classifyPrim(E->getType()) == PT_Bool);
+  if (E->isValueDependent())
+    return false;
   if (DiscardResult)
     return true;
   return this->emitConstBool(E->isSatisfied(), E);

diff  --git a/clang/test/AST/ByteCode/cxx2a.cpp b/clang/test/AST/ByteCode/cxx2a.cpp
index 744c99eaa1e68..533173d84792f 100644
--- a/clang/test/AST/ByteCode/cxx2a.cpp
+++ b/clang/test/AST/ByteCode/cxx2a.cpp
@@ -239,3 +239,17 @@ namespace GH150705 {
   constexpr const A& a = b;
   constexpr auto x = (a.*q)(); // both-error {{constant expression}}
 }
+
+namespace DependentRequiresExpr {
+  template <class T,
+            bool = []() -> bool { // both-error {{not a constant expression}}
+              if (requires { T::type; })
+                return true;
+              return false;
+            }()>
+  struct p {
+    using type = void;
+  };
+
+  template <class T> using P = p<T>::type; // both-note {{while checking a default template argument}}
+}