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android / platform / external / clang_35a / 4145db1ccb327a39726edbbb1069d5585aec4d65 / . / lib / Sema / SemaTemplateInstantiateDecl.cpp
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//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//===----------------------------------------------------------------------===/
//
// This file implements C++ template instantiation for declarations.
//
//===----------------------------------------------------------------------===/
#include "clang/Sema/SemaInternal.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTMutationListener.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/DependentDiagnostic.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/TypeLoc.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/PrettyDeclStackTrace.h"
#include "clang/Sema/Template.h"
using namespace clang;
static bool isDeclWithinFunction(const Decl *D) {
const DeclContext *DC = D->getDeclContext();
if (DC->isFunctionOrMethod())
return true;
if (DC->isRecord())
return cast<CXXRecordDecl>(DC)->isLocalClass();
return false;
}
bool TemplateDeclInstantiator::SubstQualifier(const DeclaratorDecl *OldDecl,
DeclaratorDecl *NewDecl) {
if (!OldDecl->getQualifierLoc())
return false;
NestedNameSpecifierLoc NewQualifierLoc
= SemaRef.SubstNestedNameSpecifierLoc(OldDecl->getQualifierLoc(),
TemplateArgs);
if (!NewQualifierLoc)
return true;
NewDecl->setQualifierInfo(NewQualifierLoc);
return false;
}
bool TemplateDeclInstantiator::SubstQualifier(const TagDecl *OldDecl,
TagDecl *NewDecl) {
if (!OldDecl->getQualifierLoc())
return false;
NestedNameSpecifierLoc NewQualifierLoc
= SemaRef.SubstNestedNameSpecifierLoc(OldDecl->getQualifierLoc(),
TemplateArgs);
if (!NewQualifierLoc)
return true;
NewDecl->setQualifierInfo(NewQualifierLoc);
return false;
}
// Include attribute instantiation code.
#include "clang/Sema/AttrTemplateInstantiate.inc"
static void instantiateDependentAlignedAttr(
Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
const AlignedAttr *Aligned, Decl *New, bool IsPackExpansion) {
if (Aligned->isAlignmentExpr()) {
// The alignment expression is a constant expression.
EnterExpressionEvaluationContext Unevaluated(S, Sema::ConstantEvaluated);
ExprResult Result = S.SubstExpr(Aligned->getAlignmentExpr(), TemplateArgs);
if (!Result.isInvalid())
S.AddAlignedAttr(Aligned->getLocation(), New, Result.takeAs<Expr>(),
Aligned->getSpellingListIndex(), IsPackExpansion);
} else {
TypeSourceInfo *Result = S.SubstType(Aligned->getAlignmentType(),
TemplateArgs, Aligned->getLocation(),
DeclarationName());
if (Result)
S.AddAlignedAttr(Aligned->getLocation(), New, Result,
Aligned->getSpellingListIndex(), IsPackExpansion);
}
}
static void instantiateDependentAlignedAttr(
Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
const AlignedAttr *Aligned, Decl *New) {
if (!Aligned->isPackExpansion()) {
instantiateDependentAlignedAttr(S, TemplateArgs, Aligned, New, false);
return;
}
SmallVector<UnexpandedParameterPack, 2> Unexpanded;
if (Aligned->isAlignmentExpr())
S.collectUnexpandedParameterPacks(Aligned->getAlignmentExpr(),
Unexpanded);
else
S.collectUnexpandedParameterPacks(Aligned->getAlignmentType()->getTypeLoc(),
Unexpanded);
assert(!Unexpanded.empty() && "Pack expansion without parameter packs?");
// Determine whether we can expand this attribute pack yet.
bool Expand = true, RetainExpansion = false;
Optional<unsigned> NumExpansions;
// FIXME: Use the actual location of the ellipsis.
SourceLocation EllipsisLoc = Aligned->getLocation();
if (S.CheckParameterPacksForExpansion(EllipsisLoc, Aligned->getRange(),
Unexpanded, TemplateArgs, Expand,
RetainExpansion, NumExpansions))
return;
if (!Expand) {
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(S, -1);
instantiateDependentAlignedAttr(S, TemplateArgs, Aligned, New, true);
} else {
for (unsigned I = 0; I != *NumExpansions; ++I) {
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(S, I);
instantiateDependentAlignedAttr(S, TemplateArgs, Aligned, New, false);
}
}
}
static void instantiateDependentEnableIfAttr(
Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
const EnableIfAttr *A, const Decl *Tmpl, Decl *New) {
Expr *Cond = 0;
{
EnterExpressionEvaluationContext Unevaluated(S, Sema::Unevaluated);
ExprResult Result = S.SubstExpr(A->getCond(), TemplateArgs);
if (Result.isInvalid())
return;
Cond = Result.takeAs<Expr>();
}
if (A->getCond()->isTypeDependent() && !Cond->isTypeDependent()) {
ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
if (Converted.isInvalid())
return;
Cond = Converted.take();
}
SmallVector<PartialDiagnosticAt, 8> Diags;
if (A->getCond()->isValueDependent() && !Cond->isValueDependent() &&
!Expr::isPotentialConstantExprUnevaluated(Cond, cast<FunctionDecl>(Tmpl),
Diags)) {
S.Diag(A->getLocation(), diag::err_enable_if_never_constant_expr);
for (int I = 0, N = Diags.size(); I != N; ++I)
S.Diag(Diags[I].first, Diags[I].second);
return;
}
EnableIfAttr *EIA = new (S.getASTContext())
EnableIfAttr(A->getLocation(), S.getASTContext(), Cond,
A->getMessage(),
A->getSpellingListIndex());
New->addAttr(EIA);
}
void Sema::InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
const Decl *Tmpl, Decl *New,
LateInstantiatedAttrVec *LateAttrs,
LocalInstantiationScope *OuterMostScope) {
for (const auto *TmplAttr : Tmpl->attrs()) {
// FIXME: This should be generalized to more than just the AlignedAttr.
const AlignedAttr *Aligned = dyn_cast<AlignedAttr>(TmplAttr);
if (Aligned && Aligned->isAlignmentDependent()) {
instantiateDependentAlignedAttr(*this, TemplateArgs, Aligned, New);
continue;
}
const EnableIfAttr *EnableIf = dyn_cast<EnableIfAttr>(TmplAttr);
if (EnableIf && EnableIf->getCond()->isValueDependent()) {
instantiateDependentEnableIfAttr(*this, TemplateArgs, EnableIf, Tmpl,
New);
continue;
}
assert(!TmplAttr->isPackExpansion());
if (TmplAttr->isLateParsed() && LateAttrs) {
// Late parsed attributes must be instantiated and attached after the
// enclosing class has been instantiated. See Sema::InstantiateClass.
LocalInstantiationScope *Saved = 0;
if (CurrentInstantiationScope)
Saved = CurrentInstantiationScope->cloneScopes(OuterMostScope);
LateAttrs->push_back(LateInstantiatedAttribute(TmplAttr, Saved, New));
} else {
// Allow 'this' within late-parsed attributes.
NamedDecl *ND = dyn_cast<NamedDecl>(New);
CXXRecordDecl *ThisContext =
dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext());
CXXThisScopeRAII ThisScope(*this, ThisContext, /*TypeQuals*/0,
ND && ND->isCXXInstanceMember());
Attr *NewAttr = sema::instantiateTemplateAttribute(TmplAttr, Context,
*this, TemplateArgs);
if (NewAttr)
New->addAttr(NewAttr);
}
}
}
Decl *
TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
llvm_unreachable("Translation units cannot be instantiated");
}
Decl *
TemplateDeclInstantiator::VisitLabelDecl(LabelDecl *D) {
LabelDecl *Inst = LabelDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getIdentifier());
Owner->addDecl(Inst);
return Inst;
}
Decl *
TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) {
llvm_unreachable("Namespaces cannot be instantiated");
}
Decl *
TemplateDeclInstantiator::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
NamespaceAliasDecl *Inst
= NamespaceAliasDecl::Create(SemaRef.Context, Owner,
D->getNamespaceLoc(),
D->getAliasLoc(),
D->getIdentifier(),
D->getQualifierLoc(),
D->getTargetNameLoc(),
D->getNamespace());
Owner->addDecl(Inst);
return Inst;
}
Decl *TemplateDeclInstantiator::InstantiateTypedefNameDecl(TypedefNameDecl *D,
bool IsTypeAlias) {
bool Invalid = false;
TypeSourceInfo *DI = D->getTypeSourceInfo();
if (DI->getType()->isInstantiationDependentType() ||
DI->getType()->isVariablyModifiedType()) {
DI = SemaRef.SubstType(DI, TemplateArgs,
D->getLocation(), D->getDeclName());
if (!DI) {
Invalid = true;
DI = SemaRef.Context.getTrivialTypeSourceInfo(SemaRef.Context.IntTy);
}
} else {
SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType());
}
// HACK: g++ has a bug where it gets the value kind of ?: wrong.
// libstdc++ relies upon this bug in its implementation of common_type.
// If we happen to be processing that implementation, fake up the g++ ?:
// semantics. See LWG issue 2141 for more information on the bug.
const DecltypeType *DT = DI->getType()->getAs<DecltypeType>();
CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
if (DT && RD && isa<ConditionalOperator>(DT->getUnderlyingExpr()) &&
DT->isReferenceType() &&
RD->getEnclosingNamespaceContext() == SemaRef.getStdNamespace() &&
RD->getIdentifier() && RD->getIdentifier()->isStr("common_type") &&
D->getIdentifier() && D->getIdentifier()->isStr("type") &&
SemaRef.getSourceManager().isInSystemHeader(D->getLocStart()))
// Fold it to the (non-reference) type which g++ would have produced.
DI = SemaRef.Context.getTrivialTypeSourceInfo(
DI->getType().getNonReferenceType());
// Create the new typedef
TypedefNameDecl *Typedef;
if (IsTypeAlias)
Typedef = TypeAliasDecl::Create(SemaRef.Context, Owner, D->getLocStart(),
D->getLocation(), D->getIdentifier(), DI);
else
Typedef = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocStart(),
D->getLocation(), D->getIdentifier(), DI);
if (Invalid)
Typedef->setInvalidDecl();
// If the old typedef was the name for linkage purposes of an anonymous
// tag decl, re-establish that relationship for the new typedef.
if (const TagType *oldTagType = D->getUnderlyingType()->getAs<TagType>()) {
TagDecl *oldTag = oldTagType->getDecl();
if (oldTag->getTypedefNameForAnonDecl() == D && !Invalid) {
TagDecl *newTag = DI->getType()->castAs<TagType>()->getDecl();
assert(!newTag->hasNameForLinkage());
newTag->setTypedefNameForAnonDecl(Typedef);
}
}
if (TypedefNameDecl *Prev = D->getPreviousDecl()) {
NamedDecl *InstPrev = SemaRef.FindInstantiatedDecl(D->getLocation(), Prev,
TemplateArgs);
if (!InstPrev)
return 0;
TypedefNameDecl *InstPrevTypedef = cast<TypedefNameDecl>(InstPrev);
// If the typedef types are not identical, reject them.
SemaRef.isIncompatibleTypedef(InstPrevTypedef, Typedef);
Typedef->setPreviousDecl(InstPrevTypedef);
}
SemaRef.InstantiateAttrs(TemplateArgs, D, Typedef);
Typedef->setAccess(D->getAccess());
return Typedef;
}
Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) {
Decl *Typedef = InstantiateTypedefNameDecl(D, /*IsTypeAlias=*/false);
Owner->addDecl(Typedef);
return Typedef;
}
Decl *TemplateDeclInstantiator::VisitTypeAliasDecl(TypeAliasDecl *D) {
Decl *Typedef = InstantiateTypedefNameDecl(D, /*IsTypeAlias=*/true);
Owner->addDecl(Typedef);
return Typedef;
}
Decl *
TemplateDeclInstantiator::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
// Create a local instantiation scope for this type alias template, which
// will contain the instantiations of the template parameters.
LocalInstantiationScope Scope(SemaRef);
TemplateParameterList *TempParams = D->getTemplateParameters();
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return 0;
TypeAliasDecl *Pattern = D->getTemplatedDecl();
TypeAliasTemplateDecl *PrevAliasTemplate = 0;
if (Pattern->getPreviousDecl()) {
DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName());
if (!Found.empty()) {
PrevAliasTemplate = dyn_cast<TypeAliasTemplateDecl>(Found.front());
}
}
TypeAliasDecl *AliasInst = cast_or_null<TypeAliasDecl>(
InstantiateTypedefNameDecl(Pattern, /*IsTypeAlias=*/true));
if (!AliasInst)
return 0;
TypeAliasTemplateDecl *Inst
= TypeAliasTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getDeclName(), InstParams, AliasInst);
if (PrevAliasTemplate)
Inst->setPreviousDecl(PrevAliasTemplate);
Inst->setAccess(D->getAccess());
if (!PrevAliasTemplate)
Inst->setInstantiatedFromMemberTemplate(D);
Owner->addDecl(Inst);
return Inst;
}
Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
return VisitVarDecl(D, /*InstantiatingVarTemplate=*/false);
}
Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D,
bool InstantiatingVarTemplate) {
// If this is the variable for an anonymous struct or union,
// instantiate the anonymous struct/union type first.
if (const RecordType *RecordTy = D->getType()->getAs<RecordType>())
if (RecordTy->getDecl()->isAnonymousStructOrUnion())
if (!VisitCXXRecordDecl(cast<CXXRecordDecl>(RecordTy->getDecl())))
return 0;
// Do substitution on the type of the declaration
TypeSourceInfo *DI = SemaRef.SubstType(D->getTypeSourceInfo(),
TemplateArgs,
D->getTypeSpecStartLoc(),
D->getDeclName());
if (!DI)
return 0;
if (DI->getType()->isFunctionType()) {
SemaRef.Diag(D->getLocation(), diag::err_variable_instantiates_to_function)
<< D->isStaticDataMember() << DI->getType();
return 0;
}
DeclContext *DC = Owner;
if (D->isLocalExternDecl())
SemaRef.adjustContextForLocalExternDecl(DC);
// Build the instantiated declaration.
VarDecl *Var = VarDecl::Create(SemaRef.Context, DC, D->getInnerLocStart(),
D->getLocation(), D->getIdentifier(),
DI->getType(), DI, D->getStorageClass());
// In ARC, infer 'retaining' for variables of retainable type.
if (SemaRef.getLangOpts().ObjCAutoRefCount &&
SemaRef.inferObjCARCLifetime(Var))
Var->setInvalidDecl();
// Substitute the nested name specifier, if any.
if (SubstQualifier(D, Var))
return 0;
SemaRef.BuildVariableInstantiation(Var, D, TemplateArgs, LateAttrs, Owner,
StartingScope, InstantiatingVarTemplate);
return Var;
}
Decl *TemplateDeclInstantiator::VisitAccessSpecDecl(AccessSpecDecl *D) {
AccessSpecDecl* AD
= AccessSpecDecl::Create(SemaRef.Context, D->getAccess(), Owner,
D->getAccessSpecifierLoc(), D->getColonLoc());
Owner->addHiddenDecl(AD);
return AD;
}
Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) {
bool Invalid = false;
TypeSourceInfo *DI = D->getTypeSourceInfo();
if (DI->getType()->isInstantiationDependentType() ||
DI->getType()->isVariablyModifiedType()) {
DI = SemaRef.SubstType(DI, TemplateArgs,
D->getLocation(), D->getDeclName());
if (!DI) {
DI = D->getTypeSourceInfo();
Invalid = true;
} else if (DI->getType()->isFunctionType()) {
// C++ [temp.arg.type]p3:
// If a declaration acquires a function type through a type
// dependent on a template-parameter and this causes a
// declaration that does not use the syntactic form of a
// function declarator to have function type, the program is
// ill-formed.
SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function)
<< DI->getType();
Invalid = true;
}
} else {
SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType());
}
Expr *BitWidth = D->getBitWidth();
if (Invalid)
BitWidth = 0;
else if (BitWidth) {
// The bit-width expression is a constant expression.
EnterExpressionEvaluationContext Unevaluated(SemaRef,
Sema::ConstantEvaluated);
ExprResult InstantiatedBitWidth
= SemaRef.SubstExpr(BitWidth, TemplateArgs);
if (InstantiatedBitWidth.isInvalid()) {
Invalid = true;
BitWidth = 0;
} else
BitWidth = InstantiatedBitWidth.takeAs<Expr>();
}
FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(),
DI->getType(), DI,
cast<RecordDecl>(Owner),
D->getLocation(),
D->isMutable(),
BitWidth,
D->getInClassInitStyle(),
D->getInnerLocStart(),
D->getAccess(),
0);
if (!Field) {
cast<Decl>(Owner)->setInvalidDecl();
return 0;
}
SemaRef.InstantiateAttrs(TemplateArgs, D, Field, LateAttrs, StartingScope);
if (Field->hasAttrs())
SemaRef.CheckAlignasUnderalignment(Field);
if (Invalid)
Field->setInvalidDecl();
if (!Field->getDeclName()) {
// Keep track of where this decl came from.
SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D);
}
if (CXXRecordDecl *Parent= dyn_cast<CXXRecordDecl>(Field->getDeclContext())) {
if (Parent->isAnonymousStructOrUnion() &&
Parent->getRedeclContext()->isFunctionOrMethod())
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Field);
}
Field->setImplicit(D->isImplicit());
Field->setAccess(D->getAccess());
Owner->addDecl(Field);
return Field;
}
Decl *TemplateDeclInstantiator::VisitMSPropertyDecl(MSPropertyDecl *D) {
bool Invalid = false;
TypeSourceInfo *DI = D->getTypeSourceInfo();
if (DI->getType()->isVariablyModifiedType()) {
SemaRef.Diag(D->getLocation(), diag::err_property_is_variably_modified)
<< D;
Invalid = true;
} else if (DI->getType()->isInstantiationDependentType()) {
DI = SemaRef.SubstType(DI, TemplateArgs,
D->getLocation(), D->getDeclName());
if (!DI) {
DI = D->getTypeSourceInfo();
Invalid = true;
} else if (DI->getType()->isFunctionType()) {
// C++ [temp.arg.type]p3:
// If a declaration acquires a function type through a type
// dependent on a template-parameter and this causes a
// declaration that does not use the syntactic form of a
// function declarator to have function type, the program is
// ill-formed.
SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function)
<< DI->getType();
Invalid = true;
}
} else {
SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType());
}
MSPropertyDecl *Property = MSPropertyDecl::Create(
SemaRef.Context, Owner, D->getLocation(), D->getDeclName(), DI->getType(),
DI, D->getLocStart(), D->getGetterId(), D->getSetterId());
SemaRef.InstantiateAttrs(TemplateArgs, D, Property, LateAttrs,
StartingScope);
if (Invalid)
Property->setInvalidDecl();
Property->setAccess(D->getAccess());
Owner->addDecl(Property);
return Property;
}
Decl *TemplateDeclInstantiator::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
NamedDecl **NamedChain =
new (SemaRef.Context)NamedDecl*[D->getChainingSize()];
int i = 0;
for (auto *PI : D->chain()) {
NamedDecl *Next = SemaRef.FindInstantiatedDecl(D->getLocation(), PI,
TemplateArgs);
if (!Next)
return 0;
NamedChain[i++] = Next;
}
QualType T = cast<FieldDecl>(NamedChain[i-1])->getType();
IndirectFieldDecl* IndirectField
= IndirectFieldDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getIdentifier(), T,
NamedChain, D->getChainingSize());
IndirectField->setImplicit(D->isImplicit());
IndirectField->setAccess(D->getAccess());
Owner->addDecl(IndirectField);
return IndirectField;
}
Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) {
// Handle friend type expressions by simply substituting template
// parameters into the pattern type and checking the result.
if (TypeSourceInfo *Ty = D->getFriendType()) {
TypeSourceInfo *InstTy;
// If this is an unsupported friend, don't bother substituting template
// arguments into it. The actual type referred to won't be used by any
// parts of Clang, and may not be valid for instantiating. Just use the
// same info for the instantiated friend.
if (D->isUnsupportedFriend()) {
InstTy = Ty;
} else {
InstTy = SemaRef.SubstType(Ty, TemplateArgs,
D->getLocation(), DeclarationName());
}
if (!InstTy)
return 0;
FriendDecl *FD = SemaRef.CheckFriendTypeDecl(D->getLocStart(),
D->getFriendLoc(), InstTy);
if (!FD)
return 0;
FD->setAccess(AS_public);
FD->setUnsupportedFriend(D->isUnsupportedFriend());
Owner->addDecl(FD);
return FD;
}
NamedDecl *ND = D->getFriendDecl();
assert(ND && "friend decl must be a decl or a type!");
// All of the Visit implementations for the various potential friend
// declarations have to be carefully written to work for friend
// objects, with the most important detail being that the target
// decl should almost certainly not be placed in Owner.
Decl *NewND = Visit(ND);
if (!NewND) return 0;
FriendDecl *FD =
FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(),
cast<NamedDecl>(NewND), D->getFriendLoc());
FD->setAccess(AS_public);
FD->setUnsupportedFriend(D->isUnsupportedFriend());
Owner->addDecl(FD);
return FD;
}
Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) {
Expr *AssertExpr = D->getAssertExpr();
// The expression in a static assertion is a constant expression.
EnterExpressionEvaluationContext Unevaluated(SemaRef,
Sema::ConstantEvaluated);
ExprResult InstantiatedAssertExpr
= SemaRef.SubstExpr(AssertExpr, TemplateArgs);
if (InstantiatedAssertExpr.isInvalid())
return 0;
return SemaRef.BuildStaticAssertDeclaration(D->getLocation(),
InstantiatedAssertExpr.get(),
D->getMessage(),
D->getRParenLoc(),
D->isFailed());
}
Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) {
EnumDecl *PrevDecl = 0;
if (D->getPreviousDecl()) {
NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getLocation(),
D->getPreviousDecl(),
TemplateArgs);
if (!Prev) return 0;
PrevDecl = cast<EnumDecl>(Prev);
}
EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, D->getLocStart(),
D->getLocation(), D->getIdentifier(),
PrevDecl, D->isScoped(),
D->isScopedUsingClassTag(), D->isFixed());
if (D->isFixed()) {
if (TypeSourceInfo *TI = D->getIntegerTypeSourceInfo()) {
// If we have type source information for the underlying type, it means it
// has been explicitly set by the user. Perform substitution on it before
// moving on.
SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
TypeSourceInfo *NewTI = SemaRef.SubstType(TI, TemplateArgs, UnderlyingLoc,
DeclarationName());
if (!NewTI || SemaRef.CheckEnumUnderlyingType(NewTI))
Enum->setIntegerType(SemaRef.Context.IntTy);
else
Enum->setIntegerTypeSourceInfo(NewTI);
} else {
assert(!D->getIntegerType()->isDependentType()
&& "Dependent type without type source info");
Enum->setIntegerType(D->getIntegerType());
}
}
SemaRef.InstantiateAttrs(TemplateArgs, D, Enum);
Enum->setInstantiationOfMemberEnum(D, TSK_ImplicitInstantiation);
Enum->setAccess(D->getAccess());
// Forward the mangling number from the template to the instantiated decl.
SemaRef.Context.setManglingNumber(Enum, SemaRef.Context.getManglingNumber(D));
if (SubstQualifier(D, Enum)) return 0;
Owner->addDecl(Enum);
EnumDecl *Def = D->getDefinition();
if (Def && Def != D) {
// If this is an out-of-line definition of an enum member template, check
// that the underlying types match in the instantiation of both
// declarations.
if (TypeSourceInfo *TI = Def->getIntegerTypeSourceInfo()) {
SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
QualType DefnUnderlying =
SemaRef.SubstType(TI->getType(), TemplateArgs,
UnderlyingLoc, DeclarationName());
SemaRef.CheckEnumRedeclaration(Def->getLocation(), Def->isScoped(),
DefnUnderlying, Enum);
}
}
// C++11 [temp.inst]p1: The implicit instantiation of a class template
// specialization causes the implicit instantiation of the declarations, but
// not the definitions of scoped member enumerations.
//
// DR1484 clarifies that enumeration definitions inside of a template
// declaration aren't considered entities that can be separately instantiated
// from the rest of the entity they are declared inside of.
if (isDeclWithinFunction(D) ? D == Def : Def && !Enum->isScoped()) {
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Enum);
InstantiateEnumDefinition(Enum, Def);
}
return Enum;
}
void TemplateDeclInstantiator::InstantiateEnumDefinition(
EnumDecl *Enum, EnumDecl *Pattern) {
Enum->startDefinition();
// Update the location to refer to the definition.
Enum->setLocation(Pattern->getLocation());
SmallVector<Decl*, 4> Enumerators;
EnumConstantDecl *LastEnumConst = 0;
for (auto *EC : Pattern->enumerators()) {
// The specified value for the enumerator.
ExprResult Value = SemaRef.Owned((Expr *)0);
if (Expr *UninstValue = EC->getInitExpr()) {
// The enumerator's value expression is a constant expression.
EnterExpressionEvaluationContext Unevaluated(SemaRef,
Sema::ConstantEvaluated);
Value = SemaRef.SubstExpr(UninstValue, TemplateArgs);
}
// Drop the initial value and continue.
bool isInvalid = false;
if (Value.isInvalid()) {
Value = SemaRef.Owned((Expr *)0);
isInvalid = true;
}
EnumConstantDecl *EnumConst
= SemaRef.CheckEnumConstant(Enum, LastEnumConst,
EC->getLocation(), EC->getIdentifier(),
Value.get());
if (isInvalid) {
if (EnumConst)
EnumConst->setInvalidDecl();
Enum->setInvalidDecl();
}
if (EnumConst) {
SemaRef.InstantiateAttrs(TemplateArgs, EC, EnumConst);
EnumConst->setAccess(Enum->getAccess());
Enum->addDecl(EnumConst);
Enumerators.push_back(EnumConst);
LastEnumConst = EnumConst;
if (Pattern->getDeclContext()->isFunctionOrMethod() &&
!Enum->isScoped()) {
// If the enumeration is within a function or method, record the enum
// constant as a local.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(EC, EnumConst);
}
}
}
// FIXME: Fixup LBraceLoc
SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(),
Enum->getRBraceLoc(), Enum,
Enumerators,
0, 0);
}
Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) {
llvm_unreachable("EnumConstantDecls can only occur within EnumDecls.");
}
Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) {
bool isFriend = (D->getFriendObjectKind() != Decl::FOK_None);
// Create a local instantiation scope for this class template, which
// will contain the instantiations of the template parameters.
LocalInstantiationScope Scope(SemaRef);
TemplateParameterList *TempParams = D->getTemplateParameters();
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return NULL;
CXXRecordDecl *Pattern = D->getTemplatedDecl();
// Instantiate the qualifier. We have to do this first in case
// we're a friend declaration, because if we are then we need to put
// the new declaration in the appropriate context.
NestedNameSpecifierLoc QualifierLoc = Pattern->getQualifierLoc();
if (QualifierLoc) {
QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc,
TemplateArgs);
if (!QualifierLoc)
return 0;
}
CXXRecordDecl *PrevDecl = 0;
ClassTemplateDecl *PrevClassTemplate = 0;
if (!isFriend && Pattern->getPreviousDecl()) {
DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName());
if (!Found.empty()) {
PrevClassTemplate = dyn_cast<ClassTemplateDecl>(Found.front());
if (PrevClassTemplate)
PrevDecl = PrevClassTemplate->getTemplatedDecl();
}
}
// If this isn't a friend, then it's a member template, in which
// case we just want to build the instantiation in the
// specialization. If it is a friend, we want to build it in
// the appropriate context.
DeclContext *DC = Owner;
if (isFriend) {
if (QualifierLoc) {
CXXScopeSpec SS;
SS.Adopt(QualifierLoc);
DC = SemaRef.computeDeclContext(SS);
if (!DC) return 0;
} else {
DC = SemaRef.FindInstantiatedContext(Pattern->getLocation(),
Pattern->getDeclContext(),
TemplateArgs);
}
// Look for a previous declaration of the template in the owning
// context.
LookupResult R(SemaRef, Pattern->getDeclName(), Pattern->getLocation(),
Sema::LookupOrdinaryName, Sema::ForRedeclaration);
SemaRef.LookupQualifiedName(R, DC);
if (R.isSingleResult()) {
PrevClassTemplate = R.getAsSingle<ClassTemplateDecl>();
if (PrevClassTemplate)
PrevDecl = PrevClassTemplate->getTemplatedDecl();
}
if (!PrevClassTemplate && QualifierLoc) {
SemaRef.Diag(Pattern->getLocation(), diag::err_not_tag_in_scope)
<< D->getTemplatedDecl()->getTagKind() << Pattern->getDeclName() << DC
<< QualifierLoc.getSourceRange();
return 0;
}
bool AdoptedPreviousTemplateParams = false;
if (PrevClassTemplate) {
bool Complain = true;
// HACK: libstdc++ 4.2.1 contains an ill-formed friend class
// template for struct std::tr1::__detail::_Map_base, where the
// template parameters of the friend declaration don't match the
// template parameters of the original declaration. In this one
// case, we don't complain about the ill-formed friend
// declaration.
if (isFriend && Pattern->getIdentifier() &&
Pattern->getIdentifier()->isStr("_Map_base") &&
DC->isNamespace() &&
cast<NamespaceDecl>(DC)->getIdentifier() &&
cast<NamespaceDecl>(DC)->getIdentifier()->isStr("__detail")) {
DeclContext *DCParent = DC->getParent();
if (DCParent->isNamespace() &&
cast<NamespaceDecl>(DCParent)->getIdentifier() &&
cast<NamespaceDecl>(DCParent)->getIdentifier()->isStr("tr1")) {
DeclContext *DCParent2 = DCParent->getParent();
if (DCParent2->isNamespace() &&
cast<NamespaceDecl>(DCParent2)->getIdentifier() &&
cast<NamespaceDecl>(DCParent2)->getIdentifier()->isStr("std") &&
DCParent2->getParent()->isTranslationUnit())
Complain = false;
}
}
TemplateParameterList *PrevParams
= PrevClassTemplate->getTemplateParameters();
// Make sure the parameter lists match.
if (!SemaRef.TemplateParameterListsAreEqual(InstParams, PrevParams,
Complain,
Sema::TPL_TemplateMatch)) {
if (Complain)
return 0;
AdoptedPreviousTemplateParams = true;
InstParams = PrevParams;
}
// Do some additional validation, then merge default arguments
// from the existing declarations.
if (!AdoptedPreviousTemplateParams &&
SemaRef.CheckTemplateParameterList(InstParams, PrevParams,
Sema::TPC_ClassTemplate))
return 0;
}
}
CXXRecordDecl *RecordInst
= CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), DC,
Pattern->getLocStart(), Pattern->getLocation(),
Pattern->getIdentifier(), PrevDecl,
/*DelayTypeCreation=*/true);
if (QualifierLoc)
RecordInst->setQualifierInfo(QualifierLoc);
ClassTemplateDecl *Inst
= ClassTemplateDecl::Create(SemaRef.Context, DC, D->getLocation(),
D->getIdentifier(), InstParams, RecordInst,
PrevClassTemplate);
RecordInst->setDescribedClassTemplate(Inst);
if (isFriend) {
if (PrevClassTemplate)
Inst->setAccess(PrevClassTemplate->getAccess());
else
Inst->setAccess(D->getAccess());
Inst->setObjectOfFriendDecl();
// TODO: do we want to track the instantiation progeny of this
// friend target decl?
} else {
Inst->setAccess(D->getAccess());
if (!PrevClassTemplate)
Inst->setInstantiatedFromMemberTemplate(D);
}
// Trigger creation of the type for the instantiation.
SemaRef.Context.getInjectedClassNameType(RecordInst,
Inst->getInjectedClassNameSpecialization());
// Finish handling of friends.
if (isFriend) {
DC->makeDeclVisibleInContext(Inst);
Inst->setLexicalDeclContext(Owner);
RecordInst->setLexicalDeclContext(Owner);
return Inst;
}
if (D->isOutOfLine()) {
Inst->setLexicalDeclContext(D->getLexicalDeclContext());
RecordInst->setLexicalDeclContext(D->getLexicalDeclContext());
}
Owner->addDecl(Inst);
if (!PrevClassTemplate) {
// Queue up any out-of-line partial specializations of this member
// class template; the client will force their instantiation once
// the enclosing class has been instantiated.
SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs;
D->getPartialSpecializations(PartialSpecs);
for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I)
if (PartialSpecs[I]->getFirstDecl()->isOutOfLine())
OutOfLinePartialSpecs.push_back(std::make_pair(Inst, PartialSpecs[I]));
}
return Inst;
}
Decl *
TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl(
ClassTemplatePartialSpecializationDecl *D) {
ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate();
// Lookup the already-instantiated declaration in the instantiation
// of the class template and return that.
DeclContext::lookup_result Found
= Owner->lookup(ClassTemplate->getDeclName());
if (Found.empty())
return 0;
ClassTemplateDecl *InstClassTemplate
= dyn_cast<ClassTemplateDecl>(Found.front());
if (!InstClassTemplate)
return 0;
if (ClassTemplatePartialSpecializationDecl *Result
= InstClassTemplate->findPartialSpecInstantiatedFromMember(D))
return Result;
return InstantiateClassTemplatePartialSpecialization(InstClassTemplate, D);
}
Decl *TemplateDeclInstantiator::VisitVarTemplateDecl(VarTemplateDecl *D) {
assert(D->getTemplatedDecl()->isStaticDataMember() &&
"Only static data member templates are allowed.");
// Create a local instantiation scope for this variable template, which
// will contain the instantiations of the template parameters.
LocalInstantiationScope Scope(SemaRef);
TemplateParameterList *TempParams = D->getTemplateParameters();
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return NULL;
VarDecl *Pattern = D->getTemplatedDecl();
VarTemplateDecl *PrevVarTemplate = 0;
if (Pattern->getPreviousDecl()) {
DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName());
if (!Found.empty())
PrevVarTemplate = dyn_cast<VarTemplateDecl>(Found.front());
}
VarDecl *VarInst =
cast_or_null<VarDecl>(VisitVarDecl(Pattern,
/*InstantiatingVarTemplate=*/true));
DeclContext *DC = Owner;
VarTemplateDecl *Inst = VarTemplateDecl::Create(
SemaRef.Context, DC, D->getLocation(), D->getIdentifier(), InstParams,
VarInst);
VarInst->setDescribedVarTemplate(Inst);
Inst->setPreviousDecl(PrevVarTemplate);
Inst->setAccess(D->getAccess());
if (!PrevVarTemplate)
Inst->setInstantiatedFromMemberTemplate(D);
if (D->isOutOfLine()) {
Inst->setLexicalDeclContext(D->getLexicalDeclContext());
VarInst->setLexicalDeclContext(D->getLexicalDeclContext());
}
Owner->addDecl(Inst);
if (!PrevVarTemplate) {
// Queue up any out-of-line partial specializations of this member
// variable template; the client will force their instantiation once
// the enclosing class has been instantiated.
SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs;
D->getPartialSpecializations(PartialSpecs);
for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I)
if (PartialSpecs[I]->getFirstDecl()->isOutOfLine())
OutOfLineVarPartialSpecs.push_back(
std::make_pair(Inst, PartialSpecs[I]));
}
return Inst;
}
Decl *TemplateDeclInstantiator::VisitVarTemplatePartialSpecializationDecl(
VarTemplatePartialSpecializationDecl *D) {
assert(D->isStaticDataMember() &&
"Only static data member templates are allowed.");
VarTemplateDecl *VarTemplate = D->getSpecializedTemplate();
// Lookup the already-instantiated declaration and return that.
DeclContext::lookup_result Found = Owner->lookup(VarTemplate->getDeclName());
assert(!Found.empty() && "Instantiation found nothing?");
VarTemplateDecl *InstVarTemplate = dyn_cast<VarTemplateDecl>(Found.front());
assert(InstVarTemplate && "Instantiation did not find a variable template?");
if (VarTemplatePartialSpecializationDecl *Result =
InstVarTemplate->findPartialSpecInstantiatedFromMember(D))
return Result;
return InstantiateVarTemplatePartialSpecialization(InstVarTemplate, D);
}
Decl *
TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
// Create a local instantiation scope for this function template, which
// will contain the instantiations of the template parameters and then get
// merged with the local instantiation scope for the function template
// itself.
LocalInstantiationScope Scope(SemaRef);
TemplateParameterList *TempParams = D->getTemplateParameters();
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return NULL;
FunctionDecl *Instantiated = 0;
if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl()))
Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod,
InstParams));
else
Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl(
D->getTemplatedDecl(),
InstParams));
if (!Instantiated)
return 0;
// Link the instantiated function template declaration to the function
// template from which it was instantiated.
FunctionTemplateDecl *InstTemplate
= Instantiated->getDescribedFunctionTemplate();
InstTemplate->setAccess(D->getAccess());
assert(InstTemplate &&
"VisitFunctionDecl/CXXMethodDecl didn't create a template!");
bool isFriend = (InstTemplate->getFriendObjectKind() != Decl::FOK_None);
// Link the instantiation back to the pattern *unless* this is a
// non-definition friend declaration.
if (!InstTemplate->getInstantiatedFromMemberTemplate() &&
!(isFriend && !D->getTemplatedDecl()->isThisDeclarationADefinition()))
InstTemplate->setInstantiatedFromMemberTemplate(D);
// Make declarations visible in the appropriate context.
if (!isFriend) {
Owner->addDecl(InstTemplate);
} else if (InstTemplate->getDeclContext()->isRecord() &&
!D->getPreviousDecl()) {
SemaRef.CheckFriendAccess(InstTemplate);
}
return InstTemplate;
}
Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) {
CXXRecordDecl *PrevDecl = 0;
if (D->isInjectedClassName())
PrevDecl = cast<CXXRecordDecl>(Owner);
else if (D->getPreviousDecl()) {
NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getLocation(),
D->getPreviousDecl(),
TemplateArgs);
if (!Prev) return 0;
PrevDecl = cast<CXXRecordDecl>(Prev);
}
CXXRecordDecl *Record
= CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner,
D->getLocStart(), D->getLocation(),
D->getIdentifier(), PrevDecl);
// Substitute the nested name specifier, if any.
if (SubstQualifier(D, Record))
return 0;
Record->setImplicit(D->isImplicit());
// FIXME: Check against AS_none is an ugly hack to work around the issue that
// the tag decls introduced by friend class declarations don't have an access
// specifier. Remove once this area of the code gets sorted out.
if (D->getAccess() != AS_none)
Record->setAccess(D->getAccess());
if (!D->isInjectedClassName())
Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation);
// If the original function was part of a friend declaration,
// inherit its namespace state.
if (D->getFriendObjectKind())
Record->setObjectOfFriendDecl();
// Make sure that anonymous structs and unions are recorded.
if (D->isAnonymousStructOrUnion())
Record->setAnonymousStructOrUnion(true);
if (D->isLocalClass())
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Record);
// Forward the mangling number from the template to the instantiated decl.
SemaRef.Context.setManglingNumber(Record,
SemaRef.Context.getManglingNumber(D));
Owner->addDecl(Record);
// DR1484 clarifies that the members of a local class are instantiated as part
// of the instantiation of their enclosing entity.
if (D->isCompleteDefinition() && D->isLocalClass()) {
SemaRef.InstantiateClass(D->getLocation(), Record, D, TemplateArgs,
TSK_ImplicitInstantiation,
/*Complain=*/true);
SemaRef.InstantiateClassMembers(D->getLocation(), Record, TemplateArgs,
TSK_ImplicitInstantiation);
}
return Record;
}
/// \brief Adjust the given function type for an instantiation of the
/// given declaration, to cope with modifications to the function's type that
/// aren't reflected in the type-source information.
///
/// \param D The declaration we're instantiating.
/// \param TInfo The already-instantiated type.
static QualType adjustFunctionTypeForInstantiation(ASTContext &Context,
FunctionDecl *D,
TypeSourceInfo *TInfo) {
const FunctionProtoType *OrigFunc
= D->getType()->castAs<FunctionProtoType>();
const FunctionProtoType *NewFunc
= TInfo->getType()->castAs<FunctionProtoType>();
if (OrigFunc->getExtInfo() == NewFunc->getExtInfo())
return TInfo->getType();
FunctionProtoType::ExtProtoInfo NewEPI = NewFunc->getExtProtoInfo();
NewEPI.ExtInfo = OrigFunc->getExtInfo();
return Context.getFunctionType(NewFunc->getReturnType(),
NewFunc->getParamTypes(), NewEPI);
}
/// Normal class members are of more specific types and therefore
/// don't make it here. This function serves two purposes:
/// 1) instantiating function templates
/// 2) substituting friend declarations
Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D,
TemplateParameterList *TemplateParams) {
// Check whether there is already a function template specialization for
// this declaration.
FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
if (FunctionTemplate && !TemplateParams) {
ArrayRef<TemplateArgument> Innermost = TemplateArgs.getInnermost();
void *InsertPos = 0;
FunctionDecl *SpecFunc
= FunctionTemplate->findSpecialization(Innermost.begin(), Innermost.size(),
InsertPos);
// If we already have a function template specialization, return it.
if (SpecFunc)
return SpecFunc;
}
bool isFriend;
if (FunctionTemplate)
isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None);
else
isFriend = (D->getFriendObjectKind() != Decl::FOK_None);
bool MergeWithParentScope = (TemplateParams != 0) ||
Owner->isFunctionOrMethod() ||
!(isa<Decl>(Owner) &&
cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
SmallVector<ParmVarDecl *, 4> Params;
TypeSourceInfo *TInfo = SubstFunctionType(D, Params);
if (!TInfo)
return 0;
QualType T = adjustFunctionTypeForInstantiation(SemaRef.Context, D, TInfo);
NestedNameSpecifierLoc QualifierLoc = D->getQualifierLoc();
if (QualifierLoc) {
QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc,
TemplateArgs);
if (!QualifierLoc)
return 0;
}
// If we're instantiating a local function declaration, put the result
// in the enclosing namespace; otherwise we need to find the instantiated
// context.
DeclContext *DC;
if (D->isLocalExternDecl()) {
DC = Owner;
SemaRef.adjustContextForLocalExternDecl(DC);
} else if (isFriend && QualifierLoc) {
CXXScopeSpec SS;
SS.Adopt(QualifierLoc);
DC = SemaRef.computeDeclContext(SS);
if (!DC) return 0;
} else {
DC = SemaRef.FindInstantiatedContext(D->getLocation(), D->getDeclContext(),
TemplateArgs);
}
FunctionDecl *Function =
FunctionDecl::Create(SemaRef.Context, DC, D->getInnerLocStart(),
D->getNameInfo(), T, TInfo,
D->getCanonicalDecl()->getStorageClass(),
D->isInlineSpecified(), D->hasWrittenPrototype(),
D->isConstexpr());
Function->setRangeEnd(D->getSourceRange().getEnd());
if (D->isInlined())
Function->setImplicitlyInline();
if (QualifierLoc)
Function->setQualifierInfo(QualifierLoc);
if (D->isLocalExternDecl())
Function->setLocalExternDecl();
DeclContext *LexicalDC = Owner;
if (!isFriend && D->isOutOfLine() && !D->isLocalExternDecl()) {
assert(D->getDeclContext()->isFileContext());
LexicalDC = D->getDeclContext();
}
Function->setLexicalDeclContext(LexicalDC);
// Attach the parameters
for (unsigned P = 0; P < Params.size(); ++P)
if (Params[P])
Params[P]->setOwningFunction(Function);
Function->setParams(Params);
SourceLocation InstantiateAtPOI;
if (TemplateParams) {
// Our resulting instantiation is actually a function template, since we
// are substituting only the outer template parameters. For example, given
//
// template<typename T>
// struct X {
// template<typename U> friend void f(T, U);
// };
//
// X<int> x;
//
// We are instantiating the friend function template "f" within X<int>,
// which means substituting int for T, but leaving "f" as a friend function
// template.
// Build the function template itself.
FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, DC,
Function->getLocation(),
Function->getDeclName(),
TemplateParams, Function);
Function->setDescribedFunctionTemplate(FunctionTemplate);
FunctionTemplate->setLexicalDeclContext(LexicalDC);
if (isFriend && D->isThisDeclarationADefinition()) {
// TODO: should we remember this connection regardless of whether
// the friend declaration provided a body?
FunctionTemplate->setInstantiatedFromMemberTemplate(
D->getDescribedFunctionTemplate());
}
} else if (FunctionTemplate) {
// Record this function template specialization.
ArrayRef<TemplateArgument> Innermost = TemplateArgs.getInnermost();
Function->setFunctionTemplateSpecialization(FunctionTemplate,
TemplateArgumentList::CreateCopy(SemaRef.Context,
Innermost.begin(),
Innermost.size()),
/*InsertPos=*/0);
} else if (isFriend) {
// Note, we need this connection even if the friend doesn't have a body.
// Its body may exist but not have been attached yet due to deferred
// parsing.
// FIXME: It might be cleaner to set this when attaching the body to the
// friend function declaration, however that would require finding all the
// instantiations and modifying them.
Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
}
if (InitFunctionInstantiation(Function, D))
Function->setInvalidDecl();
bool isExplicitSpecialization = false;
LookupResult Previous(
SemaRef, Function->getDeclName(), SourceLocation(),
D->isLocalExternDecl() ? Sema::LookupRedeclarationWithLinkage
: Sema::LookupOrdinaryName,
Sema::ForRedeclaration);
if (DependentFunctionTemplateSpecializationInfo *Info
= D->getDependentSpecializationInfo()) {
assert(isFriend && "non-friend has dependent specialization info?");
// This needs to be set now for future sanity.
Function->setObjectOfFriendDecl();
// Instantiate the explicit template arguments.
TemplateArgumentListInfo ExplicitArgs(Info->getLAngleLoc(),
Info->getRAngleLoc());
if (SemaRef.Subst(Info->getTemplateArgs(), Info->getNumTemplateArgs(),
ExplicitArgs, TemplateArgs))
return 0;
// Map the candidate templates to their instantiations.
for (unsigned I = 0, E = Info->getNumTemplates(); I != E; ++I) {
Decl *Temp = SemaRef.FindInstantiatedDecl(D->getLocation(),
Info->getTemplate(I),
TemplateArgs);
if (!Temp) return 0;
Previous.addDecl(cast<FunctionTemplateDecl>(Temp));
}
if (SemaRef.CheckFunctionTemplateSpecialization(Function,
&ExplicitArgs,
Previous))
Function->setInvalidDecl();
isExplicitSpecialization = true;
} else if (TemplateParams || !FunctionTemplate) {
// Look only into the namespace where the friend would be declared to
// find a previous declaration. This is the innermost enclosing namespace,
// as described in ActOnFriendFunctionDecl.
SemaRef.LookupQualifiedName(Previous, DC);
// In C++, the previous declaration we find might be a tag type
// (class or enum). In this case, the new declaration will hide the
// tag type. Note that this does does not apply if we're declaring a
// typedef (C++ [dcl.typedef]p4).
if (Previous.isSingleTagDecl())
Previous.clear();
}
SemaRef.CheckFunctionDeclaration(/*Scope*/ 0, Function, Previous,
isExplicitSpecialization);
NamedDecl *PrincipalDecl = (TemplateParams
? cast<NamedDecl>(FunctionTemplate)
: Function);
// If the original function was part of a friend declaration,
// inherit its namespace state and add it to the owner.
if (isFriend) {
PrincipalDecl->setObjectOfFriendDecl();
DC->makeDeclVisibleInContext(PrincipalDecl);
bool QueuedInstantiation = false;
// C++11 [temp.friend]p4 (DR329):
// When a function is defined in a friend function declaration in a class
// template, the function is instantiated when the function is odr-used.
// The same restrictions on multiple declarations and definitions that
// apply to non-template function declarations and definitions also apply
// to these implicit definitions.
if (D->isThisDeclarationADefinition()) {
// Check for a function body.
const FunctionDecl *Definition = 0;
if (Function->isDefined(Definition) &&
Definition->getTemplateSpecializationKind() == TSK_Undeclared) {
SemaRef.Diag(Function->getLocation(), diag::err_redefinition)
<< Function->getDeclName();
SemaRef.Diag(Definition->getLocation(), diag::note_previous_definition);
}
// Check for redefinitions due to other instantiations of this or
// a similar friend function.
else for (auto R : Function->redecls()) {
if (R == Function)
continue;
// If some prior declaration of this function has been used, we need
// to instantiate its definition.
if (!QueuedInstantiation && R->isUsed(false)) {
if (MemberSpecializationInfo *MSInfo =
Function->getMemberSpecializationInfo()) {
if (MSInfo->getPointOfInstantiation().isInvalid()) {
SourceLocation Loc = R->getLocation(); // FIXME
MSInfo->setPointOfInstantiation(Loc);
SemaRef.PendingLocalImplicitInstantiations.push_back(
std::make_pair(Function, Loc));
QueuedInstantiation = true;
}
}
}
// If some prior declaration of this function was a friend with an
// uninstantiated definition, reject it.
if (R->getFriendObjectKind()) {
if (const FunctionDecl *RPattern =
R->getTemplateInstantiationPattern()) {
if (RPattern->isDefined(RPattern)) {
SemaRef.Diag(Function->getLocation(), diag::err_redefinition)
<< Function->getDeclName();
SemaRef.Diag(R->getLocation(), diag::note_previous_definition);
break;
}
}
}
}
}
}
if (Function->isLocalExternDecl() && !Function->getPreviousDecl())
DC->makeDeclVisibleInContext(PrincipalDecl);
if (Function->isOverloadedOperator() && !DC->isRecord() &&
PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
PrincipalDecl->setNonMemberOperator();
assert(!D->isDefaulted() && "only methods should be defaulted");
return Function;
}
Decl *
TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D,
TemplateParameterList *TemplateParams,
bool IsClassScopeSpecialization) {
FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
if (FunctionTemplate && !TemplateParams) {
// We are creating a function template specialization from a function
// template. Check whether there is already a function template
// specialization for this particular set of template arguments.
ArrayRef<TemplateArgument> Innermost = TemplateArgs.getInnermost();
void *InsertPos = 0;
FunctionDecl *SpecFunc
= FunctionTemplate->findSpecialization(Innermost.begin(),
Innermost.size(),
InsertPos);
// If we already have a function template specialization, return it.
if (SpecFunc)
return SpecFunc;
}
bool isFriend;
if (FunctionTemplate)
isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None);
else
isFriend = (D->getFriendObjectKind() != Decl::FOK_None);
bool MergeWithParentScope = (TemplateParams != 0) ||
!(isa<Decl>(Owner) &&
cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
// Instantiate enclosing template arguments for friends.
SmallVector<TemplateParameterList *, 4> TempParamLists;
unsigned NumTempParamLists = 0;
if (isFriend && (NumTempParamLists = D->getNumTemplateParameterLists())) {
TempParamLists.set_size(NumTempParamLists);
for (unsigned I = 0; I != NumTempParamLists; ++I) {
TemplateParameterList *TempParams = D->getTemplateParameterList(I);
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return NULL;
TempParamLists[I] = InstParams;
}
}
SmallVector<ParmVarDecl *, 4> Params;
TypeSourceInfo *TInfo = SubstFunctionType(D, Params);
if (!TInfo)
return 0;
QualType T = adjustFunctionTypeForInstantiation(SemaRef.Context, D, TInfo);
NestedNameSpecifierLoc QualifierLoc = D->getQualifierLoc();
if (QualifierLoc) {
QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc,
TemplateArgs);
if (!QualifierLoc)
return 0;
}
DeclContext *DC = Owner;
if (isFriend) {
if (QualifierLoc) {
CXXScopeSpec SS;
SS.Adopt(QualifierLoc);
DC = SemaRef.computeDeclContext(SS);
if (DC && SemaRef.RequireCompleteDeclContext(SS, DC))
return 0;
} else {
DC = SemaRef.FindInstantiatedContext(D->getLocation(),
D->getDeclContext(),
TemplateArgs);
}
if (!DC) return 0;
}
// Build the instantiated method declaration.
CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
CXXMethodDecl *Method = 0;
SourceLocation StartLoc = D->getInnerLocStart();
DeclarationNameInfo NameInfo
= SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs);
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
Method = CXXConstructorDecl::Create(SemaRef.Context, Record,
StartLoc, NameInfo, T, TInfo,
Constructor->isExplicit(),
Constructor->isInlineSpecified(),
false, Constructor->isConstexpr());
// Claim that the instantiation of a constructor or constructor template
// inherits the same constructor that the template does.
if (CXXConstructorDecl *Inh = const_cast<CXXConstructorDecl *>(
Constructor->getInheritedConstructor())) {
// If we're instantiating a specialization of a function template, our
// "inherited constructor" will actually itself be a function template.
// Instantiate a declaration of it, too.
if (FunctionTemplate) {
assert(!TemplateParams && Inh->getDescribedFunctionTemplate() &&
!Inh->getParent()->isDependentContext() &&
"inheriting constructor template in dependent context?");
Sema::InstantiatingTemplate Inst(SemaRef, Constructor->getLocation(),
Inh);
if (Inst.isInvalid())
return 0;
Sema::ContextRAII SavedContext(SemaRef, Inh->getDeclContext());
LocalInstantiationScope LocalScope(SemaRef);
// Use the same template arguments that we deduced for the inheriting
// constructor. There's no way they could be deduced differently.
MultiLevelTemplateArgumentList InheritedArgs;
InheritedArgs.addOuterTemplateArguments(TemplateArgs.getInnermost());
Inh = cast_or_null<CXXConstructorDecl>(
SemaRef.SubstDecl(Inh, Inh->getDeclContext(), InheritedArgs));
if (!Inh)
return 0;
}
cast<CXXConstructorDecl>(Method)->setInheritedConstructor(Inh);
}
} else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
Method = CXXDestructorDecl::Create(SemaRef.Context, Record,
StartLoc, NameInfo, T, TInfo,
Destructor->isInlineSpecified(),
false);
} else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) {
Method = CXXConversionDecl::Create(SemaRef.Context, Record,
StartLoc, NameInfo, T, TInfo,
Conversion->isInlineSpecified(),
Conversion->isExplicit(),
Conversion->isConstexpr(),
Conversion->getLocEnd());
} else {
StorageClass SC = D->isStatic() ? SC_Static : SC_None;
Method = CXXMethodDecl::Create(SemaRef.Context, Record,
StartLoc, NameInfo, T, TInfo,
SC, D->isInlineSpecified(),
D->isConstexpr(), D->getLocEnd());
}
if (D->isInlined())
Method->setImplicitlyInline();
if (QualifierLoc)
Method->setQualifierInfo(QualifierLoc);
if (TemplateParams) {
// Our resulting instantiation is actually a function template, since we
// are substituting only the outer template parameters. For example, given
//
// template<typename T>
// struct X {
// template<typename U> void f(T, U);
// };
//
// X<int> x;
//
// We are instantiating the member template "f" within X<int>, which means
// substituting int for T, but leaving "f" as a member function template.
// Build the function template itself.
FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record,
Method->getLocation(),
Method->getDeclName(),
TemplateParams, Method);
if (isFriend) {
FunctionTemplate->setLexicalDeclContext(Owner);
FunctionTemplate->setObjectOfFriendDecl();
} else if (D->isOutOfLine())
FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext());
Method->setDescribedFunctionTemplate(FunctionTemplate);
} else if (FunctionTemplate) {
// Record this function template specialization.
ArrayRef<TemplateArgument> Innermost = TemplateArgs.getInnermost();
Method->setFunctionTemplateSpecialization(FunctionTemplate,
TemplateArgumentList::CreateCopy(SemaRef.Context,
Innermost.begin(),
Innermost.size()),
/*InsertPos=*/0);
} else if (!isFriend) {
// Record that this is an instantiation of a member function.
Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
}
// If we are instantiating a member function defined
// out-of-line, the instantiation will have the same lexical
// context (which will be a namespace scope) as the template.
if (isFriend) {
if (NumTempParamLists)
Method->setTemplateParameterListsInfo(SemaRef.Context,
NumTempParamLists,
TempParamLists.data());
Method->setLexicalDeclContext(Owner);
Method->setObjectOfFriendDecl();
} else if (D->isOutOfLine())
Method->setLexicalDeclContext(D->getLexicalDeclContext());
// Attach the parameters
for (unsigned P = 0; P < Params.size(); ++P)
Params[P]->setOwningFunction(Method);
Method->setParams(Params);
if (InitMethodInstantiation(Method, D))
Method->setInvalidDecl();
LookupResult Previous(SemaRef, NameInfo, Sema::LookupOrdinaryName,
Sema::ForRedeclaration);
if (!FunctionTemplate || TemplateParams || isFriend) {
SemaRef.LookupQualifiedName(Previous, Record);
// In C++, the previous declaration we find might be a tag type
// (class or enum). In this case, the new declaration will hide the
// tag type. Note that this does does not apply if we're declaring a
// typedef (C++ [dcl.typedef]p4).
if (Previous.isSingleTagDecl())
Previous.clear();
}
if (!IsClassScopeSpecialization)
SemaRef.CheckFunctionDeclaration(0, Method, Previous, false);
if (D->isPure())
SemaRef.CheckPureMethod(Method, SourceRange());
// Propagate access. For a non-friend declaration, the access is
// whatever we're propagating from. For a friend, it should be the
// previous declaration we just found.
if (isFriend && Method->getPreviousDecl())
Method->setAccess(Method->getPreviousDecl()->getAccess());
else
Method->setAccess(D->getAccess());
if (FunctionTemplate)
FunctionTemplate->setAccess(Method->getAccess());
SemaRef.CheckOverrideControl(Method);
// If a function is defined as defaulted or deleted, mark it as such now.
if (D->isExplicitlyDefaulted())
SemaRef.SetDeclDefaulted(Method, Method->getLocation());
if (D->isDeletedAsWritten())
SemaRef.SetDeclDeleted(Method, Method->getLocation());
// If there's a function template, let our caller handle it.
if (FunctionTemplate) {
// do nothing
// Don't hide a (potentially) valid declaration with an invalid one.
} else if (Method->isInvalidDecl() && !Previous.empty()) {
// do nothing
// Otherwise, check access to friends and make them visible.
} else if (isFriend) {
// We only need to re-check access for methods which we didn't
// manage to match during parsing.
if (!D->getPreviousDecl())
SemaRef.CheckFriendAccess(Method);
Record->makeDeclVisibleInContext(Method);
// Otherwise, add the declaration. We don't need to do this for
// class-scope specializations because we'll have matched them with
// the appropriate template.
} else if (!IsClassScopeSpecialization) {
Owner->addDecl(Method);
}
return Method;
}
Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
return VisitCXXMethodDecl(D);
}
Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
return VisitCXXMethodDecl(D);
}
Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) {
return VisitCXXMethodDecl(D);
}
Decl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) {
return SemaRef.SubstParmVarDecl(D, TemplateArgs, /*indexAdjustment*/ 0, None,
/*ExpectParameterPack=*/ false);
}
Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl(
TemplateTypeParmDecl *D) {
// TODO: don't always clone when decls are refcounted.
assert(D->getTypeForDecl()->isTemplateTypeParmType());
TemplateTypeParmDecl *Inst =
TemplateTypeParmDecl::Create(SemaRef.Context, Owner,
D->getLocStart(), D->getLocation(),
D->getDepth() - TemplateArgs.getNumLevels(),
D->getIndex(), D->getIdentifier(),
D->wasDeclaredWithTypename(),
D->isParameterPack());
Inst->setAccess(AS_public);
if (D->hasDefaultArgument()) {
TypeSourceInfo *InstantiatedDefaultArg =
SemaRef.SubstType(D->getDefaultArgumentInfo(), TemplateArgs,
D->getDefaultArgumentLoc(), D->getDeclName());
if (InstantiatedDefaultArg)
Inst->setDefaultArgument(InstantiatedDefaultArg, false);
}
// Introduce this template parameter's instantiation into the instantiation
// scope.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst);
return Inst;
}
Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl(
NonTypeTemplateParmDecl *D) {
// Substitute into the type of the non-type template parameter.
TypeLoc TL = D->getTypeSourceInfo()->getTypeLoc();
SmallVector<TypeSourceInfo *, 4> ExpandedParameterPackTypesAsWritten;
SmallVector<QualType, 4> ExpandedParameterPackTypes;
bool IsExpandedParameterPack = false;
TypeSourceInfo *DI;
QualType T;
bool Invalid = false;
if (D->isExpandedParameterPack()) {
// The non-type template parameter pack is an already-expanded pack
// expansion of types. Substitute into each of the expanded types.
ExpandedParameterPackTypes.reserve(D->getNumExpansionTypes());
ExpandedParameterPackTypesAsWritten.reserve(D->getNumExpansionTypes());
for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
TypeSourceInfo *NewDI =SemaRef.SubstType(D->getExpansionTypeSourceInfo(I),
TemplateArgs,
D->getLocation(),
D->getDeclName());
if (!NewDI)
return 0;
ExpandedParameterPackTypesAsWritten.push_back(NewDI);
QualType NewT =SemaRef.CheckNonTypeTemplateParameterType(NewDI->getType(),
D->getLocation());
if (NewT.isNull())
return 0;
ExpandedParameterPackTypes.push_back(NewT);
}
IsExpandedParameterPack = true;
DI = D->getTypeSourceInfo();
T = DI->getType();
} else if (D->isPackExpansion()) {
// The non-type template parameter pack's type is a pack expansion of types.
// Determine whether we need to expand this parameter pack into separate
// types.
PackExpansionTypeLoc Expansion = TL.castAs<PackExpansionTypeLoc>();
TypeLoc Pattern = Expansion.getPatternLoc();
SmallVector<UnexpandedParameterPack, 2> Unexpanded;
SemaRef.collectUnexpandedParameterPacks(Pattern, Unexpanded);
// Determine whether the set of unexpanded parameter packs can and should
// be expanded.
bool Expand = true;
bool RetainExpansion = false;
Optional<unsigned> OrigNumExpansions
= Expansion.getTypePtr()->getNumExpansions();
Optional<unsigned> NumExpansions = OrigNumExpansions;
if (SemaRef.CheckParameterPacksForExpansion(Expansion.getEllipsisLoc(),
Pattern.getSourceRange(),
Unexpanded,
TemplateArgs,
Expand, RetainExpansion,
NumExpansions))
return 0;
if (Expand) {
for (unsigned I = 0; I != *NumExpansions; ++I) {
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, I);
TypeSourceInfo *NewDI = SemaRef.SubstType(Pattern, TemplateArgs,
D->getLocation(),
D->getDeclName());
if (!NewDI)
return 0;
ExpandedParameterPackTypesAsWritten.push_back(NewDI);
QualType NewT = SemaRef.CheckNonTypeTemplateParameterType(
NewDI->getType(),
D->getLocation());
if (NewT.isNull())
return 0;
ExpandedParameterPackTypes.push_back(NewT);
}
// Note that we have an expanded parameter pack. The "type" of this
// expanded parameter pack is the original expansion type, but callers
// will end up using the expanded parameter pack types for type-checking.
IsExpandedParameterPack = true;
DI = D->getTypeSourceInfo();
T = DI->getType();
} else {
// We cannot fully expand the pack expansion now, so substitute into the
// pattern and create a new pack expansion type.
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1);
TypeSourceInfo *NewPattern = SemaRef.SubstType(Pattern, TemplateArgs,
D->getLocation(),
D->getDeclName());
if (!NewPattern)
return 0;
DI = SemaRef.CheckPackExpansion(NewPattern, Expansion.getEllipsisLoc(),
NumExpansions);
if (!DI)
return 0;
T = DI->getType();
}
} else {
// Simple case: substitution into a parameter that is not a parameter pack.
DI = SemaRef.SubstType(D->getTypeSourceInfo(), TemplateArgs,
D->getLocation(), D->getDeclName());
if (!DI)
return 0;
// Check that this type is acceptable for a non-type template parameter.
T = SemaRef.CheckNonTypeTemplateParameterType(DI->getType(),
D->getLocation());
if (T.isNull()) {
T = SemaRef.Context.IntTy;
Invalid = true;
}
}
NonTypeTemplateParmDecl *Param;
if (IsExpandedParameterPack)
Param = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner,
D->getInnerLocStart(),
D->getLocation(),
D->getDepth() - TemplateArgs.getNumLevels(),
D->getPosition(),
D->getIdentifier(), T,
DI,
ExpandedParameterPackTypes.data(),
ExpandedParameterPackTypes.size(),
ExpandedParameterPackTypesAsWritten.data());
else
Param = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner,
D->getInnerLocStart(),
D->getLocation(),
D->getDepth() - TemplateArgs.getNumLevels(),
D->getPosition(),
D->getIdentifier(), T,
D->isParameterPack(), DI);
Param->setAccess(AS_public);
if (Invalid)
Param->setInvalidDecl();
if (D->hasDefaultArgument()) {
ExprResult Value = SemaRef.SubstExpr(D->getDefaultArgument(), TemplateArgs);
if (!Value.isInvalid())
Param->setDefaultArgument(Value.get(), false);
}
// Introduce this template parameter's instantiation into the instantiation
// scope.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
return Param;
}
static void collectUnexpandedParameterPacks(
Sema &S,
TemplateParameterList *Params,
SmallVectorImpl<UnexpandedParameterPack> &Unexpanded) {
for (TemplateParameterList::const_iterator I = Params->begin(),
E = Params->end(); I != E; ++I) {
if ((*I)->isTemplateParameterPack())
continue;
if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(*I))
S.collectUnexpandedParameterPacks(NTTP->getTypeSourceInfo()->getTypeLoc(),
Unexpanded);
if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(*I))
collectUnexpandedParameterPacks(S, TTP->getTemplateParameters(),
Unexpanded);
}
}
Decl *
TemplateDeclInstantiator::VisitTemplateTemplateParmDecl(
TemplateTemplateParmDecl *D) {
// Instantiate the template parameter list of the template template parameter.
TemplateParameterList *TempParams = D->getTemplateParameters();
TemplateParameterList *InstParams;
SmallVector<TemplateParameterList*, 8> ExpandedParams;
bool IsExpandedParameterPack = false;
if (D->isExpandedParameterPack()) {
// The template template parameter pack is an already-expanded pack
// expansion of template parameters. Substitute into each of the expanded
// parameters.
ExpandedParams.reserve(D->getNumExpansionTemplateParameters());
for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
I != N; ++I) {
LocalInstantiationScope Scope(SemaRef);
TemplateParameterList *Expansion =
SubstTemplateParams(D->getExpansionTemplateParameters(I));
if (!Expansion)
return 0;
ExpandedParams.push_back(Expansion);
}
IsExpandedParameterPack = true;
InstParams = TempParams;
} else if (D->isPackExpansion()) {
// The template template parameter pack expands to a pack of template
// template parameters. Determine whether we need to expand this parameter
// pack into separate parameters.
SmallVector<UnexpandedParameterPack, 2> Unexpanded;
collectUnexpandedParameterPacks(SemaRef, D->getTemplateParameters(),
Unexpanded);
// Determine whether the set of unexpanded parameter packs can and should
// be expanded.
bool Expand = true;
bool RetainExpansion = false;
Optional<unsigned> NumExpansions;
if (SemaRef.CheckParameterPacksForExpansion(D->getLocation(),
TempParams->getSourceRange(),
Unexpanded,
TemplateArgs,
Expand, RetainExpansion,
NumExpansions))
return 0;
if (Expand) {
for (unsigned I = 0; I != *NumExpansions; ++I) {
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, I);
LocalInstantiationScope Scope(SemaRef);
TemplateParameterList *Expansion = SubstTemplateParams(TempParams);
if (!Expansion)
return 0;
ExpandedParams.push_back(Expansion);
}
// Note that we have an expanded parameter pack. The "type" of this
// expanded parameter pack is the original expansion type, but callers
// will end up using the expanded parameter pack types for type-checking.
IsExpandedParameterPack = true;
InstParams = TempParams;
} else {
// We cannot fully expand the pack expansion now, so just substitute
// into the pattern.
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1);
LocalInstantiationScope Scope(SemaRef);
InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return 0;
}
} else {
// Perform the actual substitution of template parameters within a new,
// local instantiation scope.
LocalInstantiationScope Scope(SemaRef);
InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return 0;
}
// Build the template template parameter.
TemplateTemplateParmDecl *Param;
if (IsExpandedParameterPack)
Param = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner,
D->getLocation(),
D->getDepth() - TemplateArgs.getNumLevels(),
D->getPosition(),
D->getIdentifier(), InstParams,
ExpandedParams);
else
Param = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner,
D->getLocation(),
D->getDepth() - TemplateArgs.getNumLevels(),
D->getPosition(),
D->isParameterPack(),
D->getIdentifier(), InstParams);
if (D->hasDefaultArgument()) {
NestedNameSpecifierLoc QualifierLoc =
D->getDefaultArgument().getTemplateQualifierLoc();
QualifierLoc =
SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgs);
TemplateName TName = SemaRef.SubstTemplateName(
QualifierLoc, D->getDefaultArgument().getArgument().getAsTemplate(),
D->getDefaultArgument().getTemplateNameLoc(), TemplateArgs);
if (!TName.isNull())
Param->setDefaultArgument(
TemplateArgumentLoc(TemplateArgument(TName),
D->getDefaultArgument().getTemplateQualifierLoc(),
D->getDefaultArgument().getTemplateNameLoc()),
false);
}
Param->setAccess(AS_public);
// Introduce this template parameter's instantiation into the instantiation
// scope.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
return Param;
}
Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
// Using directives are never dependent (and never contain any types or
// expressions), so they require no explicit instantiation work.
UsingDirectiveDecl *Inst
= UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getNamespaceKeyLocation(),
D->getQualifierLoc(),
D->getIdentLocation(),
D->getNominatedNamespace(),
D->getCommonAncestor());
// Add the using directive to its declaration context
// only if this is not a function or method.
if (!Owner->isFunctionOrMethod())
Owner->addDecl(Inst);
return Inst;
}
Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) {
// The nested name specifier may be dependent, for example
// template <typename T> struct t {
// struct s1 { T f1(); };
// struct s2 : s1 { using s1::f1; };
// };
// template struct t<int>;
// Here, in using s1::f1, s1 refers to t<T>::s1;
// we need to substitute for t<int>::s1.
NestedNameSpecifierLoc QualifierLoc
= SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(),
TemplateArgs);
if (!QualifierLoc)
return 0;
// The name info is non-dependent, so no transformation
// is required.
DeclarationNameInfo NameInfo = D->getNameInfo();
// We only need to do redeclaration lookups if we're in a class
// scope (in fact, it's not really even possible in non-class
// scopes).
bool CheckRedeclaration = Owner->isRecord();
LookupResult Prev(SemaRef, NameInfo, Sema::LookupUsingDeclName,
Sema::ForRedeclaration);
UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner,
D->getUsingLoc(),
QualifierLoc,
NameInfo,
D->hasTypename());
CXXScopeSpec SS;
SS.Adopt(QualifierLoc);
if (CheckRedeclaration) {
Prev.setHideTags(false);
SemaRef.LookupQualifiedName(Prev, Owner);
// Check for invalid redeclarations.
if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLoc(),
D->hasTypename(), SS,
D->getLocation(), Prev))
NewUD->setInvalidDecl();
}
if (!NewUD->isInvalidDecl() &&
SemaRef.CheckUsingDeclQualifier(D->getUsingLoc(), SS, NameInfo,
D->getLocation()))
NewUD->setInvalidDecl();
SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D);
NewUD->setAccess(D->getAccess());
Owner->addDecl(NewUD);
// Don't process the shadow decls for an invalid decl.
if (NewUD->isInvalidDecl())
return NewUD;
if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) {
if (SemaRef.CheckInheritingConstructorUsingDecl(NewUD))
NewUD->setInvalidDecl();
return NewUD;
}
bool isFunctionScope = Owner->isFunctionOrMethod();
// Process the shadow decls.
for (auto *Shadow : D->shadows()) {
NamedDecl *InstTarget =
cast_or_null<NamedDecl>(SemaRef.FindInstantiatedDecl(
Shadow->getLocation(), Shadow->getTargetDecl(), TemplateArgs));
if (!InstTarget)
return 0;
UsingShadowDecl *PrevDecl = 0;
if (CheckRedeclaration) {
if (SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev, PrevDecl))
continue;
} else if (UsingShadowDecl *OldPrev = Shadow->getPreviousDecl()) {
PrevDecl = cast_or_null<UsingShadowDecl>(SemaRef.FindInstantiatedDecl(
Shadow->getLocation(), OldPrev, TemplateArgs));
}
UsingShadowDecl *InstShadow =
SemaRef.BuildUsingShadowDecl(/*Scope*/0, NewUD, InstTarget, PrevDecl);
SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow);
if (isFunctionScope)
SemaRef.CurrentInstantiationScope->InstantiatedLocal(Shadow, InstShadow);
}
return NewUD;
}
Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) {
// Ignore these; we handle them in bulk when processing the UsingDecl.
return 0;
}
Decl * TemplateDeclInstantiator
::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
NestedNameSpecifierLoc QualifierLoc
= SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(),
TemplateArgs);
if (!QualifierLoc)
return 0;
CXXScopeSpec SS;
SS.Adopt(QualifierLoc);
// Since NameInfo refers to a typename, it cannot be a C++ special name.
// Hence, no transformation is required for it.
DeclarationNameInfo NameInfo(D->getDeclName(), D->getLocation());
NamedDecl *UD =
SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(),
D->getUsingLoc(), SS, NameInfo, 0,
/*instantiation*/ true,
/*typename*/ true, D->getTypenameLoc());
if (UD)
SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
return UD;
}
Decl * TemplateDeclInstantiator
::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
NestedNameSpecifierLoc QualifierLoc
= SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(), TemplateArgs);
if (!QualifierLoc)
return 0;
CXXScopeSpec SS;
SS.Adopt(QualifierLoc);
DeclarationNameInfo NameInfo
= SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs);
NamedDecl *UD =
SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(),
D->getUsingLoc(), SS, NameInfo, 0,
/*instantiation*/ true,
/*typename*/ false, SourceLocation());
if (UD)
SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
return UD;
}
Decl *TemplateDeclInstantiator::VisitClassScopeFunctionSpecializationDecl(
ClassScopeFunctionSpecializationDecl *Decl) {
CXXMethodDecl *OldFD = Decl->getSpecialization();
CXXMethodDecl *NewFD = cast<CXXMethodDecl>(VisitCXXMethodDecl(OldFD,
0, true));
LookupResult Previous(SemaRef, NewFD->getNameInfo(), Sema::LookupOrdinaryName,
Sema::ForRedeclaration);
TemplateArgumentListInfo TemplateArgs;
TemplateArgumentListInfo* TemplateArgsPtr = 0;
if (Decl->hasExplicitTemplateArgs()) {
TemplateArgs = Decl->templateArgs();
TemplateArgsPtr = &TemplateArgs;
}
SemaRef.LookupQualifiedName(Previous, SemaRef.CurContext);
if (SemaRef.CheckFunctionTemplateSpecialization(NewFD, TemplateArgsPtr,
Previous)) {
NewFD->setInvalidDecl();
return NewFD;
}
// Associate the specialization with the pattern.
FunctionDecl *Specialization = cast<FunctionDecl>(Previous.getFoundDecl());
assert(Specialization && "Class scope Specialization is null");
SemaRef.Context.setClassScopeSpecializationPattern(Specialization, OldFD);
return NewFD;
}
Decl *TemplateDeclInstantiator::VisitOMPThreadPrivateDecl(
OMPThreadPrivateDecl *D) {
SmallVector<Expr *, 5> Vars;
for (auto *I : D->varlists()) {
Expr *Var = SemaRef.SubstExpr(I, TemplateArgs).take();
assert(isa<DeclRefExpr>(Var) && "threadprivate arg is not a DeclRefExpr");
Vars.push_back(Var);
}
OMPThreadPrivateDecl *TD =
SemaRef.CheckOMPThreadPrivateDecl(D->getLocation(), Vars);
TD->setAccess(AS_public);
Owner->addDecl(TD);
return TD;
}
Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D) {
return VisitFunctionDecl(D, 0);
}
Decl *TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D) {
return VisitCXXMethodDecl(D, 0);
}
Decl *TemplateDeclInstantiator::VisitRecordDecl(RecordDecl *D) {
llvm_unreachable("There are only CXXRecordDecls in C++");
}
Decl *
TemplateDeclInstantiator::VisitClassTemplateSpecializationDecl(
ClassTemplateSpecializationDecl *D) {
// As a MS extension, we permit class-scope explicit specialization
// of member class templates.
ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate();
assert(ClassTemplate->getDeclContext()->isRecord() &&
D->getTemplateSpecializationKind() == TSK_ExplicitSpecialization &&
"can only instantiate an explicit specialization "
"for a member class template");
// Lookup the already-instantiated declaration in the instantiation
// of the class template. FIXME: Diagnose or assert if this fails?
DeclContext::lookup_result Found
= Owner->lookup(ClassTemplate->getDeclName());
if (Found.empty())
return 0;
ClassTemplateDecl *InstClassTemplate
= dyn_cast<ClassTemplateDecl>(Found.front());
if (!InstClassTemplate)
return 0;
// Substitute into the template arguments of the class template explicit
// specialization.
TemplateSpecializationTypeLoc Loc = D->getTypeAsWritten()->getTypeLoc().
castAs<TemplateSpecializationTypeLoc>();
TemplateArgumentListInfo InstTemplateArgs(Loc.getLAngleLoc(),
Loc.getRAngleLoc());
SmallVector<TemplateArgumentLoc, 4> ArgLocs;
for (unsigned I = 0; I != Loc.getNumArgs(); ++I)
ArgLocs.push_back(Loc.getArgLoc(I));
if (SemaRef.Subst(ArgLocs.data(), ArgLocs.size(),
InstTemplateArgs, TemplateArgs))
return 0;
// Check that the template argument list is well-formed for this
// class template.
SmallVector<TemplateArgument, 4> Converted;
if (SemaRef.CheckTemplateArgumentList(InstClassTemplate,
D->getLocation(),
InstTemplateArgs,
false,
Converted))
return 0;
// Figure out where to insert this class template explicit specialization
// in the member template's set of class template explicit specializations.
void *InsertPos = 0;
ClassTemplateSpecializationDecl *PrevDecl =
InstClassTemplate->findSpecialization(Converted.data(), Converted.size(),
InsertPos);
// Check whether we've already seen a conflicting instantiation of this
// declaration (for instance, if there was a prior implicit instantiation).
bool Ignored;
if (PrevDecl &&
SemaRef.CheckSpecializationInstantiationRedecl(D->getLocation(),
D->getSpecializationKind(),
PrevDecl,
PrevDecl->getSpecializationKind(),
PrevDecl->getPointOfInstantiation(),
Ignored))
return 0;
// If PrevDecl was a definition and D is also a definition, diagnose.
// This happens in cases like:
//
// template<typename T, typename U>
// struct Outer {
// template<typename X> struct Inner;
// template<> struct Inner<T> {};
// template<> struct Inner<U> {};
// };
//
// Outer<int, int> outer; // error: the explicit specializations of Inner
// // have the same signature.
if (PrevDecl && PrevDecl->getDefinition() &&
D->isThisDeclarationADefinition()) {
SemaRef.Diag(D->getLocation(), diag::err_redefinition) << PrevDecl;
SemaRef.Diag(PrevDecl->getDefinition()->getLocation(),
diag::note_previous_definition);
return 0;
}
// Create the class template partial specialization declaration.
ClassTemplateSpecializationDecl *InstD
= ClassTemplateSpecializationDecl::Create(SemaRef.Context,
D->getTagKind(),
Owner,
D->getLocStart(),
D->getLocation(),
InstClassTemplate,
Converted.data(),
Converted.size(),
PrevDecl);
// Add this partial specialization to the set of class template partial
// specializations.
if (!PrevDecl)
InstClassTemplate->AddSpecialization(InstD, InsertPos);
// Substitute the nested name specifier, if any.
if (SubstQualifier(D, InstD))
return 0;
// Build the canonical type that describes the converted template
// arguments of the class template explicit specialization.
QualType CanonType = SemaRef.Context.getTemplateSpecializationType(
TemplateName(InstClassTemplate), Converted.data(), Converted.size(),
SemaRef.Context.getRecordType(InstD));
// Build the fully-sugared type for this class template
// specialization as the user wrote in the specialization
// itself. This means that we'll pretty-print the type retrieved
// from the specialization's declaration the way that the user
// actually wrote the specialization, rather than formatting the
// name based on the "canonical" representation used to store the
// template arguments in the specialization.
TypeSourceInfo *WrittenTy = SemaRef.Context.getTemplateSpecializationTypeInfo(
TemplateName(InstClassTemplate), D->getLocation(), InstTemplateArgs,
CanonType);
InstD->setAccess(D->getAccess());
InstD->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation);
InstD->setSpecializationKind(D->getSpecializationKind());
InstD->setTypeAsWritten(WrittenTy);
InstD->setExternLoc(D->getExternLoc());
InstD->setTemplateKeywordLoc(D->getTemplateKeywordLoc());
Owner->addDecl(InstD);
// Instantiate the members of the class-scope explicit specialization eagerly.
// We don't have support for lazy instantiation of an explicit specialization
// yet, and MSVC eagerly instantiates in this case.
if (D->isThisDeclarationADefinition() &&
SemaRef.InstantiateClass(D->getLocation(), InstD, D, TemplateArgs,
TSK_ImplicitInstantiation,
/*Complain=*/true))
return 0;
return InstD;
}
Decl *TemplateDeclInstantiator::VisitVarTemplateSpecializationDecl(
VarTemplateSpecializationDecl *D) {
TemplateArgumentListInfo VarTemplateArgsInfo;
VarTemplateDecl *VarTemplate = D->getSpecializedTemplate();
assert(VarTemplate &&
"A template specialization without specialized template?");
// Substitute the current template arguments.
const TemplateArgumentListInfo &TemplateArgsInfo = D->getTemplateArgsInfo();
VarTemplateArgsInfo.setLAngleLoc(TemplateArgsInfo.getLAngleLoc());
VarTemplateArgsInfo.setRAngleLoc(TemplateArgsInfo.getRAngleLoc());
if (SemaRef.Subst(TemplateArgsInfo.getArgumentArray(),
TemplateArgsInfo.size(), VarTemplateArgsInfo, TemplateArgs))
return 0;
// Check that the template argument list is well-formed for this template.
SmallVector<TemplateArgument, 4> Converted;
if (SemaRef.CheckTemplateArgumentList(
VarTemplate, VarTemplate->getLocStart(),
const_cast<TemplateArgumentListInfo &>(VarTemplateArgsInfo), false,
Converted))
return 0;
// Find the variable template specialization declaration that
// corresponds to these arguments.
void *InsertPos = 0;
if (VarTemplateSpecializationDecl *VarSpec = VarTemplate->findSpecialization(
Converted.data(), Converted.size(), InsertPos))
// If we already have a variable template specialization, return it.
return VarSpec;
return VisitVarTemplateSpecializationDecl(VarTemplate, D, InsertPos,
VarTemplateArgsInfo, Converted);
}
Decl *TemplateDeclInstantiator::VisitVarTemplateSpecializationDecl(
VarTemplateDecl *VarTemplate, VarDecl *D, void *InsertPos,
const TemplateArgumentListInfo &TemplateArgsInfo,
llvm::ArrayRef<TemplateArgument> Converted) {
// If this is the variable for an anonymous struct or union,
// instantiate the anonymous struct/union type first.
if (const RecordType *RecordTy = D->getType()->getAs<RecordType>())
if (RecordTy->getDecl()->isAnonymousStructOrUnion())
if (!VisitCXXRecordDecl(cast<CXXRecordDecl>(RecordTy->getDecl())))
return 0;
// Do substitution on the type of the declaration
TypeSourceInfo *DI =
SemaRef.SubstType(D->getTypeSourceInfo(), TemplateArgs,
D->getTypeSpecStartLoc(), D->getDeclName());
if (!DI)
return 0;
if (DI->getType()->isFunctionType()) {
SemaRef.Diag(D->getLocation(), diag::err_variable_instantiates_to_function)
<< D->isStaticDataMember() << DI->getType();
return 0;
}
// Build the instantiated declaration
VarTemplateSpecializationDecl *Var = VarTemplateSpecializationDecl::Create(
SemaRef.Context, Owner, D->getInnerLocStart(), D->getLocation(),
VarTemplate, DI->getType(), DI, D->getStorageClass(), Converted.data(),
Converted.size());
Var->setTemplateArgsInfo(TemplateArgsInfo);
if (InsertPos)
VarTemplate->AddSpecialization(Var, InsertPos);
// Substitute the nested name specifier, if any.
if (SubstQualifier(D, Var))
return 0;
SemaRef.BuildVariableInstantiation(Var, D, TemplateArgs, LateAttrs,
Owner, StartingScope);
return Var;
}
Decl *TemplateDeclInstantiator::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
llvm_unreachable("@defs is not supported in Objective-C++");
}
Decl *TemplateDeclInstantiator::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
// FIXME: We need to be able to instantiate FriendTemplateDecls.
unsigned DiagID = SemaRef.getDiagnostics().getCustomDiagID(
DiagnosticsEngine::Error,
"cannot instantiate %0 yet");
SemaRef.Diag(D->getLocation(), DiagID)
<< D->getDeclKindName();
return 0;
}
Decl *TemplateDeclInstantiator::VisitDecl(Decl *D) {
llvm_unreachable("Unexpected decl");
}
Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner,
const MultiLevelTemplateArgumentList &TemplateArgs) {
TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs);
if (D->isInvalidDecl())
return 0;
return Instantiator.Visit(D);
}
/// \brief Instantiates a nested template parameter list in the current
/// instantiation context.
///
/// \param L The parameter list to instantiate
///
/// \returns NULL if there was an error
TemplateParameterList *
TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) {
// Get errors for all the parameters before bailing out.
bool Invalid = false;
unsigned N = L->size();
typedef SmallVector<NamedDecl *, 8> ParamVector;
ParamVector Params;
Params.reserve(N);
for (TemplateParameterList::iterator PI = L->begin(), PE = L->end();
PI != PE; ++PI) {
NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI));
Params.push_back(D);
Invalid = Invalid || !D || D->isInvalidDecl();
}
// Clean up if we had an error.
if (Invalid)
return NULL;
TemplateParameterList *InstL
= TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(),
L->getLAngleLoc(), &Params.front(), N,
L->getRAngleLoc());
return InstL;
}
/// \brief Instantiate the declaration of a class template partial
/// specialization.
///
/// \param ClassTemplate the (instantiated) class template that is partially
// specialized by the instantiation of \p PartialSpec.
///
/// \param PartialSpec the (uninstantiated) class template partial
/// specialization that we are instantiating.
///
/// \returns The instantiated partial specialization, if successful; otherwise,
/// NULL to indicate an error.
ClassTemplatePartialSpecializationDecl *
TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization(
ClassTemplateDecl *ClassTemplate,
ClassTemplatePartialSpecializationDecl *PartialSpec) {
// Create a local instantiation scope for this class template partial
// specialization, which will contain the instantiations of the template
// parameters.
LocalInstantiationScope Scope(SemaRef);
// Substitute into the template parameters of the class template partial
// specialization.
TemplateParameterList *TempParams = PartialSpec->getTemplateParameters();
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return 0;
// Substitute into the template arguments of the class template partial
// specialization.
const ASTTemplateArgumentListInfo *TemplArgInfo
= PartialSpec->getTemplateArgsAsWritten();
TemplateArgumentListInfo InstTemplateArgs(TemplArgInfo->LAngleLoc,
TemplArgInfo->RAngleLoc);
if (SemaRef.Subst(TemplArgInfo->getTemplateArgs(),
TemplArgInfo->NumTemplateArgs,
InstTemplateArgs, TemplateArgs))
return 0;
// Check that the template argument list is well-formed for this
// class template.
SmallVector<TemplateArgument, 4> Converted;
if (SemaRef.CheckTemplateArgumentList(ClassTemplate,
PartialSpec->getLocation(),
InstTemplateArgs,
false,
Converted))
return 0;
// Figure out where to insert this class template partial specialization
// in the member template's set of class template partial specializations.
void *InsertPos = 0;
ClassTemplateSpecializationDecl *PrevDecl
= ClassTemplate->findPartialSpecialization(Converted.data(),
Converted.size(), InsertPos);
// Build the canonical type that describes the converted template
// arguments of the class template partial specialization.
QualType CanonType
= SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate),
Converted.data(),
Converted.size());
// Build the fully-sugared type for this class template
// specialization as the user wrote in the specialization
// itself. This means that we'll pretty-print the type retrieved
// from the specialization's declaration the way that the user
// actually wrote the specialization, rather than formatting the
// name based on the "canonical" representation used to store the
// template arguments in the specialization.
TypeSourceInfo *WrittenTy
= SemaRef.Context.getTemplateSpecializationTypeInfo(
TemplateName(ClassTemplate),
PartialSpec->getLocation(),
InstTemplateArgs,
CanonType);
if (PrevDecl) {
// We've already seen a partial specialization with the same template
// parameters and template arguments. This can happen, for example, when
// substituting the outer template arguments ends up causing two
// class template partial specializations of a member class template
// to have identical forms, e.g.,
//
// template<typename T, typename U>
// struct Outer {
// template<typename X, typename Y> struct Inner;
// template<typename Y> struct Inner<T, Y>;
// template<typename Y> struct Inner<U, Y>;
// };
//
// Outer<int, int> outer; // error: the partial specializations of Inner
// // have the same signature.
SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared)
<< WrittenTy->getType();
SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here)
<< SemaRef.Context.getTypeDeclType(PrevDecl);
return 0;
}
// Create the class template partial specialization declaration.
ClassTemplatePartialSpecializationDecl *InstPartialSpec
= ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context,
PartialSpec->getTagKind(),
Owner,
PartialSpec->getLocStart(),
PartialSpec->getLocation(),
InstParams,
ClassTemplate,
Converted.data(),
Converted.size(),
InstTemplateArgs,
CanonType,
0);
// Substitute the nested name specifier, if any.
if (SubstQualifier(PartialSpec, InstPartialSpec))
return 0;
InstPartialSpec->setInstantiatedFromMember(PartialSpec);
InstPartialSpec->setTypeAsWritten(WrittenTy);
// Add this partial specialization to the set of class template partial
// specializations.
ClassTemplate->AddPartialSpecialization(InstPartialSpec, /*InsertPos=*/0);
return InstPartialSpec;
}
/// \brief Instantiate the declaration of a variable template partial
/// specialization.
///
/// \param VarTemplate the (instantiated) variable template that is partially
/// specialized by the instantiation of \p PartialSpec.
///
/// \param PartialSpec the (uninstantiated) variable template partial
/// specialization that we are instantiating.
///
/// \returns The instantiated partial specialization, if successful; otherwise,
/// NULL to indicate an error.
VarTemplatePartialSpecializationDecl *
TemplateDeclInstantiator::InstantiateVarTemplatePartialSpecialization(
VarTemplateDecl *VarTemplate,
VarTemplatePartialSpecializationDecl *PartialSpec) {
// Create a local instantiation scope for this variable template partial
// specialization, which will contain the instantiations of the template
// parameters.
LocalInstantiationScope Scope(SemaRef);
// Substitute into the template parameters of the variable template partial
// specialization.
TemplateParameterList *TempParams = PartialSpec->getTemplateParameters();
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return 0;
// Substitute into the template arguments of the variable template partial
// specialization.
const ASTTemplateArgumentListInfo *TemplArgInfo
= PartialSpec->getTemplateArgsAsWritten();
TemplateArgumentListInfo InstTemplateArgs(TemplArgInfo->LAngleLoc,
TemplArgInfo->RAngleLoc);
if (SemaRef.Subst(TemplArgInfo->getTemplateArgs(),
TemplArgInfo->NumTemplateArgs,
InstTemplateArgs, TemplateArgs))
return 0;
// Check that the template argument list is well-formed for this