https://github.com/sdkrystian created
https://github.com/llvm/llvm-project/pull/104458
Fixes #104268. Still need tests.
>From 9f4fb3fb8df6d0981723ce9b8da809d9f2284348 Mon Sep 17 00:00:00 2001
From: Krystian Stasiowski <sdkryst...@gmail.com>
Date: Thu, 15 Aug 2024 11:27:34 -0400
Subject: [PATCH] [Clang][Sema] Use the correct lookup context when building
overloaded 'operator->' in the current instantiation
---
clang/include/clang/Sema/Sema.h | 3 +--
clang/lib/Sema/SemaExprCXX.cpp | 25 ++++++++-----------
clang/lib/Sema/SemaOverload.cpp | 14 +++++++----
clang/lib/Sema/TreeTransform.h | 4 +--
.../temp.res/temp.dep/temp.dep.type/p4.cpp | 24 ++++++++++--------
5 files changed, 35 insertions(+), 35 deletions(-)
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 25cb6c8fbf6104..b9c5c5e4b92ed9 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -10616,8 +10616,7 @@ class Sema final : public SemaBase {
/// BuildOverloadedArrowExpr - Build a call to an overloaded @c operator->
/// (if one exists), where @c Base is an expression of class type and
/// @c Member is the name of the member we're trying to find.
- ExprResult BuildOverloadedArrowExpr(Scope *S, Expr *Base,
- SourceLocation OpLoc,
+ ExprResult BuildOverloadedArrowExpr(Expr *Base, SourceLocation OpLoc,
bool *NoArrowOperatorFound = nullptr);
ExprResult BuildCXXMemberCallExpr(Expr *Exp, NamedDecl *FoundDecl,
diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
index 124435330ca104..d33d635ff76c5b 100644
--- a/clang/lib/Sema/SemaExprCXX.cpp
+++ b/clang/lib/Sema/SemaExprCXX.cpp
@@ -7876,18 +7876,6 @@ ExprResult Sema::ActOnStartCXXMemberReference(Scope *S,
Expr *Base,
QualType BaseType = Base->getType();
MayBePseudoDestructor = false;
- if (BaseType->isDependentType()) {
- // If we have a pointer to a dependent type and are using the -> operator,
- // the object type is the type that the pointer points to. We might still
- // have enough information about that type to do something useful.
- if (OpKind == tok::arrow)
- if (const PointerType *Ptr = BaseType->getAs<PointerType>())
- BaseType = Ptr->getPointeeType();
-
- ObjectType = ParsedType::make(BaseType);
- MayBePseudoDestructor = true;
- return Base;
- }
// C++ [over.match.oper]p8:
// [...] When operator->returns, the operator-> is applied to the value
@@ -7902,7 +7890,7 @@ ExprResult Sema::ActOnStartCXXMemberReference(Scope *S,
Expr *Base,
SmallVector<FunctionDecl*, 8> OperatorArrows;
CTypes.insert(Context.getCanonicalType(BaseType));
- while (BaseType->isRecordType()) {
+ while (BaseType->getAsRecordDecl()) {
if (OperatorArrows.size() >= getLangOpts().ArrowDepth) {
Diag(OpLoc, diag::err_operator_arrow_depth_exceeded)
<< StartingType << getLangOpts().ArrowDepth <<
Base->getSourceRange();
@@ -7913,7 +7901,7 @@ ExprResult Sema::ActOnStartCXXMemberReference(Scope *S,
Expr *Base,
}
Result = BuildOverloadedArrowExpr(
- S, Base, OpLoc,
+ Base, OpLoc,
// When in a template specialization and on the first loop iteration,
// potentially give the default diagnostic (with the fixit in a
// separate note) instead of having the error reported back to here
@@ -7939,7 +7927,14 @@ ExprResult Sema::ActOnStartCXXMemberReference(Scope *S,
Expr *Base,
}
}
return ExprError();
+ } else if (Result.isUnset()) {
+ // BuildOverloadedArrowExpr returns an empty expression to indicate
+ // that we need to build a dependent overloaded arrow expression.
+ assert(BaseType->isDependentType());
+ BaseType = Context.DependentTy;
+ break;
}
+
Base = Result.get();
if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(Base))
OperatorArrows.push_back(OpCall->getDirectCallee());
@@ -7977,7 +7972,7 @@ ExprResult Sema::ActOnStartCXXMemberReference(Scope *S,
Expr *Base,
// it's legal for the type to be incomplete if this is a pseudo-destructor
// call. We'll do more incomplete-type checks later in the lookup process,
// so just skip this check for ObjC types.
- if (!BaseType->isRecordType()) {
+ if (!BaseType->getAsRecordDecl()) {
ObjectType = ParsedType::make(BaseType);
MayBePseudoDestructor = true;
return Base;
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 52f640eb96b73b..4340181f316560 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -15864,10 +15864,9 @@ Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Obj,
return CheckForImmediateInvocation(MaybeBindToTemporary(TheCall), Method);
}
-ExprResult
-Sema::BuildOverloadedArrowExpr(Scope *S, Expr *Base, SourceLocation OpLoc,
- bool *NoArrowOperatorFound) {
- assert(Base->getType()->isRecordType() &&
+ExprResult Sema::BuildOverloadedArrowExpr(Expr *Base, SourceLocation OpLoc,
+ bool *NoArrowOperatorFound) {
+ assert(Base->getType()->getAsRecordDecl() &&
"left-hand side must have class type");
if (checkPlaceholderForOverload(*this, Base))
@@ -15890,7 +15889,12 @@ Sema::BuildOverloadedArrowExpr(Scope *S, Expr *Base,
SourceLocation OpLoc,
return ExprError();
LookupResult R(*this, OpName, OpLoc, LookupOrdinaryName);
- LookupQualifiedName(R, Base->getType()->castAs<RecordType>()->getDecl());
+ LookupParsedName(R, /*S=*/nullptr, /*SS=*/nullptr, Base->getType());
+
+ if (R.wasNotFoundInCurrentInstantiation() ||
+ (Base->isTypeDependent() && !R.empty()))
+ return ExprEmpty();
+
R.suppressAccessDiagnostics();
for (LookupResult::iterator Oper = R.begin(), OperEnd = R.end();
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 78ec964037dfe9..6a849662015531 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -16542,10 +16542,10 @@ ExprResult
TreeTransform<Derived>::RebuildCXXOperatorCallExpr(
} else if (Op == OO_Arrow) {
// It is possible that the type refers to a RecoveryExpr created earlier
// in the tree transformation.
- if (First->getType()->isDependentType())
+ if (First->containsErrors())
return ExprError();
// -> is never a builtin operation.
- return SemaRef.BuildOverloadedArrowExpr(nullptr, First, OpLoc);
+ return SemaRef.BuildOverloadedArrowExpr(First, OpLoc);
} else if (Second == nullptr || isPostIncDec) {
if (!First->getType()->isOverloadableType() ||
(Op == OO_Amp && getSema().isQualifiedMemberAccess(First))) {
diff --git a/clang/test/CXX/temp/temp.res/temp.dep/temp.dep.type/p4.cpp
b/clang/test/CXX/temp/temp.res/temp.dep/temp.dep.type/p4.cpp
index f32f49ef4539a5..89c22a0bc137d9 100644
--- a/clang/test/CXX/temp/temp.res/temp.dep/temp.dep.type/p4.cpp
+++ b/clang/test/CXX/temp/temp.res/temp.dep/temp.dep.type/p4.cpp
@@ -484,16 +484,19 @@ namespace N4 {
template<typename T>
struct A {
void not_instantiated(A a, A<T> b, T c) {
- a->x;
- b->x;
+ a->x; // expected-error {{member reference type 'A<T>' is not a pointer;
did you mean to use '.'?}}
+ b->x; // expected-error {{member reference type 'A<T>' is not a pointer;
did you mean to use '.'?}}
c->x;
}
void instantiated(A a, A<T> b, T c) {
- a->x; // expected-error {{member reference type 'A<int>' is not a
pointer; did you mean to use '.'?}}
- // expected-error@-1 {{no member named 'x' in 'N4::A<int>'}}
- b->x; // expected-error {{member reference type 'A<int>' is not a
pointer; did you mean to use '.'?}}
- // expected-error@-1 {{no member named 'x' in 'N4::A<int>'}}
+ // FIXME: We should only emit a single diagnostic suggesting to use '.'!
+ a->x; // expected-error {{member reference type 'A<T>' is not a pointer;
did you mean to use '.'?}}
+ // expected-error@-1 {{member reference type 'A<int>' is not a
pointer; did you mean to use '.'?}}
+ // expected-error@-2 {{no member named 'x' in 'N4::A<int>'}}
+ b->x; // expected-error {{member reference type 'A<T>' is not a pointer;
did you mean to use '.'?}}
+ // expected-error@-1 {{member reference type 'A<int>' is not a
pointer; did you mean to use '.'?}}
+ // expected-error@-2 {{no member named 'x' in 'N4::A<int>'}}
c->x; // expected-error {{member reference type 'int' is not a pointer}}
}
};
@@ -540,11 +543,10 @@ namespace N4 {
a->T::f();
a->T::g();
- // FIXME: 'U' should be a dependent name, and its lookup context should
be 'a.operator->()'!
- a->U::x; // expected-error {{use of undeclared identifier 'U'}}
- a->U::y; // expected-error {{use of undeclared identifier 'U'}}
- a->U::f(); // expected-error {{use of undeclared identifier 'U'}}
- a->U::g(); // expected-error {{use of undeclared identifier 'U'}}
+ a->U::x;
+ a->U::y;
+ a->U::f();
+ a->U::g();
}
void instantiated(D a) {
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