[llvm-branch-commits] [clang] Cherry pick: [Clang][Sema] Make UnresolvedLookupExprs in class scope explicit spec… (PR #102514)
Tobias Hieta via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Thu Aug 15 00:34:22 PDT 2024
https://github.com/tru updated https://github.com/llvm/llvm-project/pull/102514
>From dec94b04c02fe18296e29a10f2db7e8da054be0f Mon Sep 17 00:00:00 2001
From: Krystian Stasiowski <sdkrystian at gmail.com>
Date: Tue, 6 Aug 2024 12:40:44 -0400
Subject: [PATCH] [Clang][Sema] Make UnresolvedLookupExprs in class scope
explicit specializations instantiation dependent (#100392)
A class member named by an expression in a member function that may instantiate to a static _or_ non-static member is represented by a `UnresolvedLookupExpr` in order to defer the implicit transformation to a class member access expression until instantiation. Since `ASTContext::getDecltypeType` only creates a `DecltypeType` that has a `DependentDecltypeType` as its canonical type when the operand is instantiation dependent, and since we do not transform types unless they are instantiation dependent, we need to mark the `UnresolvedLookupExpr` as instantiation dependent in order to correctly build a `DecltypeType` using the expression as its operand with a `DependentDecltypeType` canonical type. Fixes #99873.
(cherry picked from commit 55ea36002bd364518c20b3ce282640c920697bf7)
---
clang/include/clang/AST/ExprCXX.h | 7 ++++---
clang/lib/AST/ASTImporter.cpp | 6 ++++--
clang/lib/AST/ExprCXX.cpp | 19 +++++++++++--------
clang/lib/Sema/SemaCoroutine.cpp | 3 ++-
clang/lib/Sema/SemaDecl.cpp | 2 +-
clang/lib/Sema/SemaDeclCXX.cpp | 2 +-
clang/lib/Sema/SemaExpr.cpp | 2 +-
clang/lib/Sema/SemaExprMember.cpp | 3 ++-
clang/lib/Sema/SemaOpenMP.cpp | 6 ++++--
clang/lib/Sema/SemaOverload.cpp | 6 +++---
clang/lib/Sema/SemaTemplate.cpp | 3 ++-
clang/lib/Sema/TreeTransform.h | 8 ++++----
clang/test/SemaCXX/decltype.cpp | 25 +++++++++++++++++++++++++
13 files changed, 64 insertions(+), 28 deletions(-)
diff --git a/clang/include/clang/AST/ExprCXX.h b/clang/include/clang/AST/ExprCXX.h
index c2feac525c1ea6..45cfd7bfb7f92c 100644
--- a/clang/include/clang/AST/ExprCXX.h
+++ b/clang/include/clang/AST/ExprCXX.h
@@ -3229,7 +3229,7 @@ class UnresolvedLookupExpr final
const DeclarationNameInfo &NameInfo, bool RequiresADL,
const TemplateArgumentListInfo *TemplateArgs,
UnresolvedSetIterator Begin, UnresolvedSetIterator End,
- bool KnownDependent);
+ bool KnownDependent, bool KnownInstantiationDependent);
UnresolvedLookupExpr(EmptyShell Empty, unsigned NumResults,
bool HasTemplateKWAndArgsInfo);
@@ -3248,7 +3248,7 @@ class UnresolvedLookupExpr final
NestedNameSpecifierLoc QualifierLoc,
const DeclarationNameInfo &NameInfo, bool RequiresADL,
UnresolvedSetIterator Begin, UnresolvedSetIterator End,
- bool KnownDependent);
+ bool KnownDependent, bool KnownInstantiationDependent);
// After canonicalization, there may be dependent template arguments in
// CanonicalConverted But none of Args is dependent. When any of
@@ -3258,7 +3258,8 @@ class UnresolvedLookupExpr final
NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
const DeclarationNameInfo &NameInfo, bool RequiresADL,
const TemplateArgumentListInfo *Args, UnresolvedSetIterator Begin,
- UnresolvedSetIterator End, bool KnownDependent);
+ UnresolvedSetIterator End, bool KnownDependent,
+ bool KnownInstantiationDependent);
static UnresolvedLookupExpr *CreateEmpty(const ASTContext &Context,
unsigned NumResults,
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 08ef09d353afc9..e95992b99f7e9d 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -8578,13 +8578,15 @@ ASTNodeImporter::VisitUnresolvedLookupExpr(UnresolvedLookupExpr *E) {
return UnresolvedLookupExpr::Create(
Importer.getToContext(), *ToNamingClassOrErr, *ToQualifierLocOrErr,
*ToTemplateKeywordLocOrErr, ToNameInfo, E->requiresADL(), &ToTAInfo,
- ToDecls.begin(), ToDecls.end(), KnownDependent);
+ ToDecls.begin(), ToDecls.end(), KnownDependent,
+ /*KnownInstantiationDependent=*/E->isInstantiationDependent());
}
return UnresolvedLookupExpr::Create(
Importer.getToContext(), *ToNamingClassOrErr, *ToQualifierLocOrErr,
ToNameInfo, E->requiresADL(), ToDecls.begin(), ToDecls.end(),
- /*KnownDependent=*/E->isTypeDependent());
+ /*KnownDependent=*/E->isTypeDependent(),
+ /*KnownInstantiationDependent=*/E->isInstantiationDependent());
}
ExpectedStmt
diff --git a/clang/lib/AST/ExprCXX.cpp b/clang/lib/AST/ExprCXX.cpp
index 8d2a1b5611ccc6..45e2badf2ddd4a 100644
--- a/clang/lib/AST/ExprCXX.cpp
+++ b/clang/lib/AST/ExprCXX.cpp
@@ -402,10 +402,11 @@ UnresolvedLookupExpr::UnresolvedLookupExpr(
NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
const DeclarationNameInfo &NameInfo, bool RequiresADL,
const TemplateArgumentListInfo *TemplateArgs, UnresolvedSetIterator Begin,
- UnresolvedSetIterator End, bool KnownDependent)
+ UnresolvedSetIterator End, bool KnownDependent,
+ bool KnownInstantiationDependent)
: OverloadExpr(UnresolvedLookupExprClass, Context, QualifierLoc,
TemplateKWLoc, NameInfo, TemplateArgs, Begin, End,
- KnownDependent, false, false),
+ KnownDependent, KnownInstantiationDependent, false),
NamingClass(NamingClass) {
UnresolvedLookupExprBits.RequiresADL = RequiresADL;
}
@@ -420,7 +421,7 @@ UnresolvedLookupExpr *UnresolvedLookupExpr::Create(
const ASTContext &Context, CXXRecordDecl *NamingClass,
NestedNameSpecifierLoc QualifierLoc, const DeclarationNameInfo &NameInfo,
bool RequiresADL, UnresolvedSetIterator Begin, UnresolvedSetIterator End,
- bool KnownDependent) {
+ bool KnownDependent, bool KnownInstantiationDependent) {
unsigned NumResults = End - Begin;
unsigned Size = totalSizeToAlloc<DeclAccessPair, ASTTemplateKWAndArgsInfo,
TemplateArgumentLoc>(NumResults, 0, 0);
@@ -428,7 +429,8 @@ UnresolvedLookupExpr *UnresolvedLookupExpr::Create(
return new (Mem) UnresolvedLookupExpr(
Context, NamingClass, QualifierLoc,
/*TemplateKWLoc=*/SourceLocation(), NameInfo, RequiresADL,
- /*TemplateArgs=*/nullptr, Begin, End, KnownDependent);
+ /*TemplateArgs=*/nullptr, Begin, End, KnownDependent,
+ KnownInstantiationDependent);
}
UnresolvedLookupExpr *UnresolvedLookupExpr::Create(
@@ -436,7 +438,8 @@ UnresolvedLookupExpr *UnresolvedLookupExpr::Create(
NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
const DeclarationNameInfo &NameInfo, bool RequiresADL,
const TemplateArgumentListInfo *Args, UnresolvedSetIterator Begin,
- UnresolvedSetIterator End, bool KnownDependent) {
+ UnresolvedSetIterator End, bool KnownDependent,
+ bool KnownInstantiationDependent) {
unsigned NumResults = End - Begin;
bool HasTemplateKWAndArgsInfo = Args || TemplateKWLoc.isValid();
unsigned NumTemplateArgs = Args ? Args->size() : 0;
@@ -444,9 +447,9 @@ UnresolvedLookupExpr *UnresolvedLookupExpr::Create(
TemplateArgumentLoc>(
NumResults, HasTemplateKWAndArgsInfo, NumTemplateArgs);
void *Mem = Context.Allocate(Size, alignof(UnresolvedLookupExpr));
- return new (Mem) UnresolvedLookupExpr(Context, NamingClass, QualifierLoc,
- TemplateKWLoc, NameInfo, RequiresADL,
- Args, Begin, End, KnownDependent);
+ return new (Mem) UnresolvedLookupExpr(
+ Context, NamingClass, QualifierLoc, TemplateKWLoc, NameInfo, RequiresADL,
+ Args, Begin, End, KnownDependent, KnownInstantiationDependent);
}
UnresolvedLookupExpr *UnresolvedLookupExpr::CreateEmpty(
diff --git a/clang/lib/Sema/SemaCoroutine.cpp b/clang/lib/Sema/SemaCoroutine.cpp
index 81334c817b2af2..4e180d648cd826 100644
--- a/clang/lib/Sema/SemaCoroutine.cpp
+++ b/clang/lib/Sema/SemaCoroutine.cpp
@@ -820,7 +820,8 @@ ExprResult Sema::BuildOperatorCoawaitLookupExpr(Scope *S, SourceLocation Loc) {
Expr *CoawaitOp = UnresolvedLookupExpr::Create(
Context, /*NamingClass*/ nullptr, NestedNameSpecifierLoc(),
DeclarationNameInfo(OpName, Loc), /*RequiresADL*/ true, Functions.begin(),
- Functions.end(), /*KnownDependent=*/false);
+ Functions.end(), /*KnownDependent=*/false,
+ /*KnownInstantiationDependent=*/false);
assert(CoawaitOp);
return CoawaitOp;
}
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 01231f8e385ef1..fa4bfe13053d8e 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -1219,7 +1219,7 @@ Sema::NameClassification Sema::ClassifyName(Scope *S, CXXScopeSpec &SS,
return NameClassification::OverloadSet(UnresolvedLookupExpr::Create(
Context, Result.getNamingClass(), SS.getWithLocInContext(Context),
Result.getLookupNameInfo(), ADL, Result.begin(), Result.end(),
- /*KnownDependent=*/false));
+ /*KnownDependent=*/false, /*KnownInstantiationDependent=*/false));
}
ExprResult
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 04b8d88cae217b..66ca62f5d7c4cd 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -1289,7 +1289,7 @@ static bool checkTupleLikeDecomposition(Sema &S,
S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(),
DeclarationNameInfo(GetDN, Loc), /*RequiresADL=*/true, &Args,
UnresolvedSetIterator(), UnresolvedSetIterator(),
- /*KnownDependent=*/false);
+ /*KnownDependent=*/false, /*KnownInstantiationDependent=*/false);
Expr *Arg = E.get();
E = S.BuildCallExpr(nullptr, Get, Loc, Arg, Loc);
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 74c0e017059055..edb8b79a2220ba 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -3188,7 +3188,7 @@ ExprResult Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
UnresolvedLookupExpr *ULE = UnresolvedLookupExpr::Create(
Context, R.getNamingClass(), SS.getWithLocInContext(Context),
R.getLookupNameInfo(), NeedsADL, R.begin(), R.end(),
- /*KnownDependent=*/false);
+ /*KnownDependent=*/false, /*KnownInstantiationDependent=*/false);
return ULE;
}
diff --git a/clang/lib/Sema/SemaExprMember.cpp b/clang/lib/Sema/SemaExprMember.cpp
index 2070f3b7bb3a2f..f1ba26f38520a9 100644
--- a/clang/lib/Sema/SemaExprMember.cpp
+++ b/clang/lib/Sema/SemaExprMember.cpp
@@ -331,7 +331,8 @@ ExprResult Sema::BuildPossibleImplicitMemberExpr(
return UnresolvedLookupExpr::Create(
Context, R.getNamingClass(), SS.getWithLocInContext(Context),
TemplateKWLoc, R.getLookupNameInfo(), /*RequiresADL=*/false,
- TemplateArgs, R.begin(), R.end(), /*KnownDependent=*/true);
+ TemplateArgs, R.begin(), R.end(), /*KnownDependent=*/true,
+ /*KnownInstantiationDependent=*/true);
case IMA_Error_StaticOrExplicitContext:
case IMA_Error_Unrelated:
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 67e3c1d9067f37..6cbc075302eb55 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -17968,7 +17968,8 @@ buildDeclareReductionRef(Sema &SemaRef, SourceLocation Loc, SourceRange Range,
return UnresolvedLookupExpr::Create(
SemaRef.Context, /*NamingClass=*/nullptr,
ReductionIdScopeSpec.getWithLocInContext(SemaRef.Context), ReductionId,
- /*ADL=*/true, ResSet.begin(), ResSet.end(), /*KnownDependent=*/false);
+ /*ADL=*/true, ResSet.begin(), ResSet.end(), /*KnownDependent=*/false,
+ /*KnownInstantiationDependent=*/false);
}
// Lookup inside the classes.
// C++ [over.match.oper]p3:
@@ -20834,7 +20835,8 @@ static ExprResult buildUserDefinedMapperRef(Sema &SemaRef, Scope *S,
return UnresolvedLookupExpr::Create(
SemaRef.Context, /*NamingClass=*/nullptr,
MapperIdScopeSpec.getWithLocInContext(SemaRef.Context), MapperId,
- /*ADL=*/false, URS.begin(), URS.end(), /*KnownDependent=*/false);
+ /*ADL=*/false, URS.begin(), URS.end(), /*KnownDependent=*/false,
+ /*KnownInstantiationDependent=*/false);
}
SourceLocation Loc = MapperId.getLoc();
// [OpenMP 5.0], 2.19.7.3 declare mapper Directive, Restrictions
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 554a2df14bea65..28fd3b06156b9b 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -14083,9 +14083,9 @@ ExprResult Sema::CreateUnresolvedLookupExpr(CXXRecordDecl *NamingClass,
DeclarationNameInfo DNI,
const UnresolvedSetImpl &Fns,
bool PerformADL) {
- return UnresolvedLookupExpr::Create(Context, NamingClass, NNSLoc, DNI,
- PerformADL, Fns.begin(), Fns.end(),
- /*KnownDependent=*/false);
+ return UnresolvedLookupExpr::Create(
+ Context, NamingClass, NNSLoc, DNI, PerformADL, Fns.begin(), Fns.end(),
+ /*KnownDependent=*/false, /*KnownInstantiationDependent=*/false);
}
ExprResult Sema::BuildCXXMemberCallExpr(Expr *E, NamedDecl *FoundDecl,
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 87b1f98bbe5ac9..ca71542d886fa1 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -4436,7 +4436,8 @@ ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
UnresolvedLookupExpr *ULE = UnresolvedLookupExpr::Create(
Context, R.getNamingClass(), SS.getWithLocInContext(Context),
TemplateKWLoc, R.getLookupNameInfo(), RequiresADL, TemplateArgs,
- R.begin(), R.end(), KnownDependent);
+ R.begin(), R.end(), KnownDependent,
+ /*KnownInstantiationDependent=*/false);
// Model the templates with UnresolvedTemplateTy. The expression should then
// either be transformed in an instantiation or be diagnosed in
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 84e846356e4378..51e6a4845bf6fd 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -10541,7 +10541,7 @@ TreeTransform<Derived>::TransformOMPReductionClause(OMPReductionClause *C) {
SemaRef.Context, /*NamingClass=*/nullptr,
ReductionIdScopeSpec.getWithLocInContext(SemaRef.Context), NameInfo,
/*ADL=*/true, Decls.begin(), Decls.end(),
- /*KnownDependent=*/false));
+ /*KnownDependent=*/false, /*KnownInstantiationDependent=*/false));
} else
UnresolvedReductions.push_back(nullptr);
}
@@ -10588,7 +10588,7 @@ OMPClause *TreeTransform<Derived>::TransformOMPTaskReductionClause(
SemaRef.Context, /*NamingClass=*/nullptr,
ReductionIdScopeSpec.getWithLocInContext(SemaRef.Context), NameInfo,
/*ADL=*/true, Decls.begin(), Decls.end(),
- /*KnownDependent=*/false));
+ /*KnownDependent=*/false, /*KnownInstantiationDependent=*/false));
} else
UnresolvedReductions.push_back(nullptr);
}
@@ -10634,7 +10634,7 @@ TreeTransform<Derived>::TransformOMPInReductionClause(OMPInReductionClause *C) {
SemaRef.Context, /*NamingClass=*/nullptr,
ReductionIdScopeSpec.getWithLocInContext(SemaRef.Context), NameInfo,
/*ADL=*/true, Decls.begin(), Decls.end(),
- /*KnownDependent=*/false));
+ /*KnownDependent=*/false, /*KnownInstantiationDependent=*/false));
} else
UnresolvedReductions.push_back(nullptr);
}
@@ -10816,7 +10816,7 @@ bool transformOMPMappableExprListClause(
TT.getSema().Context, /*NamingClass=*/nullptr,
MapperIdScopeSpec.getWithLocInContext(TT.getSema().Context),
MapperIdInfo, /*ADL=*/true, Decls.begin(), Decls.end(),
- /*KnownDependent=*/false));
+ /*KnownDependent=*/false, /*KnownInstantiationDependent=*/false));
} else {
UnresolvedMappers.push_back(nullptr);
}
diff --git a/clang/test/SemaCXX/decltype.cpp b/clang/test/SemaCXX/decltype.cpp
index 96abb60836e400..a37b89939565d3 100644
--- a/clang/test/SemaCXX/decltype.cpp
+++ b/clang/test/SemaCXX/decltype.cpp
@@ -139,6 +139,31 @@ namespace GH58674 {
}
}
+namespace GH99873 {
+struct B {
+ int x;
+};
+
+template<typename T>
+struct A {
+ template<typename U>
+ constexpr int f() const {
+ return 1;
+ }
+
+ template<>
+ constexpr int f<int>() const {
+ return decltype(B::x)();
+ }
+};
+
+// This shouldn't crash.
+static_assert(A<int>().f<int>() == 0, "");
+// The result should not be dependent.
+static_assert(A<int>().f<int>() != 0, ""); // expected-error {{static assertion failed due to requirement 'GH99873::A<int>().f<int>() != 0'}}
+ // expected-note at -1 {{expression evaluates to '0 != 0'}}
+}
+
template<typename>
class conditional {
};
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