usaxena95 updated this revision to Diff 485725.
usaxena95 added a comment.
Perform access-dependent checks after transforming requires clause.
This is more generic and less invasive than the previous version which changed
`RebuildMemberExpr` and also produced duplicate diagnostics.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D140547/new/
https://reviews.llvm.org/D140547
Files:
clang/lib/Sema/SemaTemplateInstantiate.cpp
clang/test/CXX/expr/expr.prim/expr.prim.req/simple-requirement.cpp
Index: clang/test/CXX/expr/expr.prim/expr.prim.req/simple-requirement.cpp
===================================================================
--- clang/test/CXX/expr/expr.prim/expr.prim.req/simple-requirement.cpp
+++ clang/test/CXX/expr/expr.prim/expr.prim.req/simple-requirement.cpp
@@ -104,3 +104,54 @@
constexpr bool b = requires (X &x) { static_cast<int(*)[(typeid(x),
0)]>(nullptr); };
// expected-error@-1{{constraint variable 'x' cannot be used in an evaluated
context}}
// expected-note@-2{{'x' declared here}}
+
+namespace access_checks {
+template<auto>
+struct A {
+ static constexpr bool foo();
+ static constexpr bool bar();
+ static constexpr bool baz();
+ static constexpr bool faz();
+};
+
+class C{};
+
+class B {
+ void p() {}
+ bool data_member = true;
+ static const bool static_member = true;
+ friend struct A<0>;
+};
+
+template<auto x>
+constexpr bool A<x>::foo() {
+ return requires(B b) { b.p(); };
+}
+static_assert(!A<1>::foo());
+static_assert(A<0>::foo());
+
+template<auto x>
+constexpr bool A<x>::bar() {
+ return requires() { B::static_member; };
+}
+static_assert(!A<1>::bar());
+static_assert(A<0>::bar());
+
+template<auto x>
+constexpr bool A<x>::baz() {
+ return requires(B b) { b.data_member; };
+}
+static_assert(!A<1>::baz());
+static_assert(A<0>::baz());
+
+template<auto x>
+constexpr bool A<x>::faz() {
+ return requires(B a, B b) {
+ a.p();
+ b.data_member;
+ B::static_member;
+ };
+}
+static_assert(!A<1>::faz());
+static_assert(A<0>::faz());
+}
\ No newline at end of file
Index: clang/lib/Sema/SemaTemplateInstantiate.cpp
===================================================================
--- clang/lib/Sema/SemaTemplateInstantiate.cpp
+++ clang/lib/Sema/SemaTemplateInstantiate.cpp
@@ -15,6 +15,7 @@
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/ASTMutationListener.h"
+#include "clang/AST/DeclBase.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprConcepts.h"
@@ -1363,7 +1364,19 @@
ExprResult TransformRequiresExpr(RequiresExpr *E) {
LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
- return inherited::TransformRequiresExpr(E);
+ ExprResult TransReq = inherited::TransformRequiresExpr(E);
+ {
+ if (TransReq.isInvalid() || !E->getBody()->isDependentContext())
+ return TransReq;
+ Sema::SFINAETrap Trap(SemaRef);
+ // We recreated parameters, but not by instantiating them. There may be
+ // pending access-dependent diagnostics to produce.
+ // RequiresExpr Body serves as the DeclContext for the parameters.
+ SemaRef.PerformDependentDiagnostics(E->getBody(), TemplateArgs);
+ if (Trap.hasErrorOccurred())
+ return ExprError();
+ }
+ return TransReq;
}
bool TransformRequiresExprRequirements(
Index: clang/test/CXX/expr/expr.prim/expr.prim.req/simple-requirement.cpp
===================================================================
--- clang/test/CXX/expr/expr.prim/expr.prim.req/simple-requirement.cpp
+++ clang/test/CXX/expr/expr.prim/expr.prim.req/simple-requirement.cpp
@@ -104,3 +104,54 @@
constexpr bool b = requires (X &x) { static_cast<int(*)[(typeid(x), 0)]>(nullptr); };
// expected-error@-1{{constraint variable 'x' cannot be used in an evaluated context}}
// expected-note@-2{{'x' declared here}}
+
+namespace access_checks {
+template<auto>
+struct A {
+ static constexpr bool foo();
+ static constexpr bool bar();
+ static constexpr bool baz();
+ static constexpr bool faz();
+};
+
+class C{};
+
+class B {
+ void p() {}
+ bool data_member = true;
+ static const bool static_member = true;
+ friend struct A<0>;
+};
+
+template<auto x>
+constexpr bool A<x>::foo() {
+ return requires(B b) { b.p(); };
+}
+static_assert(!A<1>::foo());
+static_assert(A<0>::foo());
+
+template<auto x>
+constexpr bool A<x>::bar() {
+ return requires() { B::static_member; };
+}
+static_assert(!A<1>::bar());
+static_assert(A<0>::bar());
+
+template<auto x>
+constexpr bool A<x>::baz() {
+ return requires(B b) { b.data_member; };
+}
+static_assert(!A<1>::baz());
+static_assert(A<0>::baz());
+
+template<auto x>
+constexpr bool A<x>::faz() {
+ return requires(B a, B b) {
+ a.p();
+ b.data_member;
+ B::static_member;
+ };
+}
+static_assert(!A<1>::faz());
+static_assert(A<0>::faz());
+}
\ No newline at end of file
Index: clang/lib/Sema/SemaTemplateInstantiate.cpp
===================================================================
--- clang/lib/Sema/SemaTemplateInstantiate.cpp
+++ clang/lib/Sema/SemaTemplateInstantiate.cpp
@@ -15,6 +15,7 @@
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/ASTMutationListener.h"
+#include "clang/AST/DeclBase.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprConcepts.h"
@@ -1363,7 +1364,19 @@
ExprResult TransformRequiresExpr(RequiresExpr *E) {
LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
- return inherited::TransformRequiresExpr(E);
+ ExprResult TransReq = inherited::TransformRequiresExpr(E);
+ {
+ if (TransReq.isInvalid() || !E->getBody()->isDependentContext())
+ return TransReq;
+ Sema::SFINAETrap Trap(SemaRef);
+ // We recreated parameters, but not by instantiating them. There may be
+ // pending access-dependent diagnostics to produce.
+ // RequiresExpr Body serves as the DeclContext for the parameters.
+ SemaRef.PerformDependentDiagnostics(E->getBody(), TemplateArgs);
+ if (Trap.hasErrorOccurred())
+ return ExprError();
+ }
+ return TransReq;
}
bool TransformRequiresExprRequirements(
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