https://github.com/tbaederr created
https://github.com/llvm/llvm-project/pull/155230
Fixes #152899
>From 6acbe858dba0195b8b0ecbe3b4a69c6fc07f5f2b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbae...@redhat.com>
Date: Mon, 25 Aug 2025 12:22:20 +0200
Subject: [PATCH] [clang][bytecode] Reject dependent RequiresExprs
Fixes #152899
---
clang/lib/AST/ByteCode/Compiler.cpp | 2 ++
clang/test/AST/ByteCode/cxx2a.cpp | 14 ++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/clang/lib/AST/ByteCode/Compiler.cpp
b/clang/lib/AST/ByteCode/Compiler.cpp
index e3235d34e230e..a98c0acb4f660 100644
--- a/clang/lib/AST/ByteCode/Compiler.cpp
+++ b/clang/lib/AST/ByteCode/Compiler.cpp
@@ -3879,6 +3879,8 @@ 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}}
+}
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