[clang] Revert "[Clang][Sema] Fix lookup of dependent operator= outside of complete-class contexts (#91498)" (PR #91620)
Krystian Stasiowski via cfe-commits
cfe-commits at lists.llvm.org
Thu May 9 09:31:27 PDT 2024
https://github.com/sdkrystian created https://github.com/llvm/llvm-project/pull/91620
This reverts commit 62b5b61f436add042d8729dc9837d055613180d9 (#91498).
>From 7b2f3da17dfc93a4f0aa69ad4da90707b6f2e8b6 Mon Sep 17 00:00:00 2001
From: Krystian Stasiowski <sdkrystian at gmail.com>
Date: Thu, 9 May 2024 12:30:28 -0400
Subject: [PATCH] Revert "[Clang][Sema] Fix lookup of dependent operator=
outside of complete-class contexts (#91498)"
This reverts commit 62b5b61f436add042d8729dc9837d055613180d9.
---
clang/lib/Sema/SemaLookup.cpp | 35 ++++++++-----------
clang/lib/Sema/SemaTemplate.cpp | 7 ++--
.../temp.res/temp.dep/temp.dep.type/p4.cpp | 13 -------
3 files changed, 20 insertions(+), 35 deletions(-)
diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index e20de338ebb1..e63da5875d2c 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -1267,20 +1267,6 @@ struct FindLocalExternScope {
LookupResult &R;
bool OldFindLocalExtern;
};
-
-/// Returns true if 'operator=' should be treated as a dependent name.
-bool isDependentAssignmentOperator(DeclarationName Name,
- DeclContext *LookupContext) {
- const auto *LookupRecord = dyn_cast_if_present<CXXRecordDecl>(LookupContext);
- // If the lookup context is the current instantiation but we are outside a
- // complete-class context, we will never find the implicitly declared
- // copy/move assignment operators because they are declared at the closing '}'
- // of the class specifier. In such cases, we treat 'operator=' like any other
- // unqualified name because the results of name lookup in the template
- // definition/instantiation context will always be the same.
- return Name.getCXXOverloadedOperator() == OO_Equal && LookupRecord &&
- !LookupRecord->isBeingDefined() && LookupRecord->isDependentContext();
-}
} // end anonymous namespace
bool Sema::CppLookupName(LookupResult &R, Scope *S) {
@@ -1289,6 +1275,13 @@ bool Sema::CppLookupName(LookupResult &R, Scope *S) {
DeclarationName Name = R.getLookupName();
Sema::LookupNameKind NameKind = R.getLookupKind();
+ // If this is the name of an implicitly-declared special member function,
+ // go through the scope stack to implicitly declare
+ if (isImplicitlyDeclaredMemberFunctionName(Name)) {
+ for (Scope *PreS = S; PreS; PreS = PreS->getParent())
+ if (DeclContext *DC = PreS->getEntity())
+ DeclareImplicitMemberFunctionsWithName(*this, Name, R.getNameLoc(), DC);
+ }
// C++23 [temp.dep.general]p2:
// The component name of an unqualified-id is dependent if
// - it is a conversion-function-id whose conversion-type-id
@@ -1306,8 +1299,9 @@ bool Sema::CppLookupName(LookupResult &R, Scope *S) {
if (isImplicitlyDeclaredMemberFunctionName(Name)) {
for (Scope *PreS = S; PreS; PreS = PreS->getParent())
if (DeclContext *DC = PreS->getEntity()) {
- if (!R.isTemplateNameLookup() &&
- isDependentAssignmentOperator(Name, DC)) {
+ if (DC->isDependentContext() && isa<CXXRecordDecl>(DC) &&
+ Name.getCXXOverloadedOperator() == OO_Equal &&
+ !R.isTemplateNameLookup()) {
R.setNotFoundInCurrentInstantiation();
return false;
}
@@ -2478,6 +2472,8 @@ bool Sema::LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
}
} QL(LookupCtx);
+ bool TemplateNameLookup = R.isTemplateNameLookup();
+ CXXRecordDecl *LookupRec = dyn_cast<CXXRecordDecl>(LookupCtx);
if (!InUnqualifiedLookup && !R.isForRedeclaration()) {
// C++23 [temp.dep.type]p5:
// A qualified name is dependent if
@@ -2490,14 +2486,13 @@ bool Sema::LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
if (DeclarationName Name = R.getLookupName();
(Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
Name.getCXXNameType()->isDependentType()) ||
- (!R.isTemplateNameLookup() &&
- isDependentAssignmentOperator(Name, LookupCtx))) {
+ (Name.getCXXOverloadedOperator() == OO_Equal && LookupRec &&
+ LookupRec->isDependentContext() && !TemplateNameLookup)) {
R.setNotFoundInCurrentInstantiation();
return false;
}
}
- CXXRecordDecl *LookupRec = dyn_cast<CXXRecordDecl>(LookupCtx);
if (LookupDirect(*this, R, LookupCtx)) {
R.resolveKind();
if (LookupRec)
@@ -2609,7 +2604,7 @@ bool Sema::LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
// template, and if the name is used as a template-name, the
// reference refers to the class template itself and not a
// specialization thereof, and is not ambiguous.
- if (R.isTemplateNameLookup())
+ if (TemplateNameLookup)
if (auto *TD = getAsTemplateNameDecl(ND))
ND = TD;
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 480bc74c2001..7e57fa069672 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -726,7 +726,7 @@ Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
const DeclarationNameInfo &NameInfo,
bool isAddressOfOperand,
const TemplateArgumentListInfo *TemplateArgs) {
- QualType ThisType = getCurrentThisType();
+ DeclContext *DC = getFunctionLevelDeclContext();
// C++11 [expr.prim.general]p12:
// An id-expression that denotes a non-static data member or non-static
@@ -748,7 +748,10 @@ Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
IsEnum = isa_and_nonnull<EnumType>(NNS->getAsType());
if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum &&
- !ThisType.isNull()) {
+ isa<CXXMethodDecl>(DC) &&
+ cast<CXXMethodDecl>(DC)->isImplicitObjectMemberFunction()) {
+ QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType().getNonReferenceType();
+
// Since the 'this' expression is synthesized, we don't need to
// perform the double-lookup check.
NamedDecl *FirstQualifierInScope = nullptr;
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 43053c18c507..46dd52f8c4c1 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
@@ -471,19 +471,6 @@ namespace N3 {
this->C::operator=(*this);
}
};
-
- template<typename T>
- struct D {
- auto not_instantiated() -> decltype(operator=(0)); // expected-error {{use of undeclared 'operator='}}
- };
-
- template<typename T>
- struct E {
- auto instantiated(E& e) -> decltype(operator=(e)); // expected-error {{use of undeclared 'operator='}}
- };
-
- template struct E<int>; // expected-note {{in instantiation of template class 'N3::E<int>' requested here}}
-
} // namespace N3
namespace N4 {
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