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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/Sema/Lookup.h"
#include "clang/Sema/PrettyDeclStackTrace.h"
#include "clang/Sema/Template.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.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"
using namespace clang;
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;
}
// FIXME: Is this still too simple?
void Sema::InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
const Decl *Tmpl, Decl *New) {
for (AttrVec::const_iterator i = Tmpl->attr_begin(), e = Tmpl->attr_end();
i != e; ++i) {
const Attr *TmplAttr = *i;
// FIXME: This should be generalized to more than just the AlignedAttr.
if (const AlignedAttr *Aligned = dyn_cast<AlignedAttr>(TmplAttr)) {
if (Aligned->isAlignmentDependent()) {
if (Aligned->isAlignmentExpr()) {
// The alignment expression is a constant expression.
EnterExpressionEvaluationContext Unevaluated(*this,
Sema::ConstantEvaluated);
ExprResult Result = SubstExpr(Aligned->getAlignmentExpr(),
TemplateArgs);
if (!Result.isInvalid())
AddAlignedAttr(Aligned->getLocation(), New, Result.takeAs<Expr>());
} else {
TypeSourceInfo *Result = SubstType(Aligned->getAlignmentType(),
TemplateArgs,
Aligned->getLocation(),
DeclarationName());
if (Result)
AddAlignedAttr(Aligned->getLocation(), New, Result);
}
continue;
}
}
// FIXME: Is cloning correct for all attributes?
Attr *NewAttr = TmplAttr->clone(Context);
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());
}
// 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) {
TagDecl *newTag = DI->getType()->castAs<TagType>()->getDecl();
assert(!newTag->getIdentifier() && !newTag->getTypedefNameForAnonDecl());
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->setPreviousDeclaration(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.first != Found.second) {
PrevAliasTemplate = dyn_cast<TypeAliasTemplateDecl>(*Found.first);
}
}
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->setPreviousDeclaration(PrevAliasTemplate);
Inst->setAccess(D->getAccess());
if (!PrevAliasTemplate)
Inst->setInstantiatedFromMemberTemplate(D);
Owner->addDecl(Inst);
return Inst;
}
/// \brief Instantiate an initializer, breaking it into separate
/// initialization arguments.
///
/// \param Init The initializer to instantiate.
///
/// \param TemplateArgs Template arguments to be substituted into the
/// initializer.
///
/// \param NewArgs Will be filled in with the instantiation arguments.
///
/// \returns true if an error occurred, false otherwise
bool Sema::InstantiateInitializer(Expr *Init,
const MultiLevelTemplateArgumentList &TemplateArgs,
SourceLocation &LParenLoc,
ASTOwningVector<Expr*> &NewArgs,
SourceLocation &RParenLoc) {
NewArgs.clear();
LParenLoc = SourceLocation();
RParenLoc = SourceLocation();
if (!Init)
return false;
if (ExprWithCleanups *ExprTemp = dyn_cast<ExprWithCleanups>(Init))
Init = ExprTemp->getSubExpr();
while (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(Init))
Init = Binder->getSubExpr();
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Init))
Init = ICE->getSubExprAsWritten();
if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
LParenLoc = ParenList->getLParenLoc();
RParenLoc = ParenList->getRParenLoc();
return SubstExprs(ParenList->getExprs(), ParenList->getNumExprs(),
true, TemplateArgs, NewArgs);
}
if (CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init)) {
if (!isa<CXXTemporaryObjectExpr>(Construct)) {
if (SubstExprs(Construct->getArgs(), Construct->getNumArgs(), true,
TemplateArgs, NewArgs))
return true;
// FIXME: Fake locations!
LParenLoc = PP.getLocForEndOfToken(Init->getLocStart());
RParenLoc = LParenLoc;
return false;
}
}
ExprResult Result = SubstExpr(Init, TemplateArgs);
if (Result.isInvalid())
return true;
NewArgs.push_back(Result.takeAs<Expr>());
return false;
}
Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
// 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
VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner,
D->getInnerLocStart(),
D->getLocation(), D->getIdentifier(),
DI->getType(), DI,
D->getStorageClass(),
D->getStorageClassAsWritten());
Var->setThreadSpecified(D->isThreadSpecified());
Var->setCXXDirectInitializer(D->hasCXXDirectInitializer());
Var->setCXXForRangeDecl(D->isCXXForRangeDecl());
Var->setConstexpr(D->isConstexpr());
// Substitute the nested name specifier, if any.
if (SubstQualifier(D, Var))
return 0;
// If we are instantiating a static data member defined
// out-of-line, the instantiation will have the same lexical
// context (which will be a namespace scope) as the template.
if (D->isOutOfLine())
Var->setLexicalDeclContext(D->getLexicalDeclContext());
Var->setAccess(D->getAccess());
if (!D->isStaticDataMember()) {
Var->setUsed(D->isUsed(false));
Var->setReferenced(D->isReferenced());
}
// FIXME: In theory, we could have a previous declaration for variables that
// are not static data members.
// FIXME: having to fake up a LookupResult is dumb.
LookupResult Previous(SemaRef, Var->getDeclName(), Var->getLocation(),
Sema::LookupOrdinaryName, Sema::ForRedeclaration);
if (D->isStaticDataMember())
SemaRef.LookupQualifiedName(Previous, Owner, false);
// In ARC, infer 'retaining' for variables of retainable type.
if (SemaRef.getLangOptions().ObjCAutoRefCount &&
SemaRef.inferObjCARCLifetime(Var))
Var->setInvalidDecl();
SemaRef.CheckVariableDeclaration(Var, Previous);
if (D->isOutOfLine()) {
D->getLexicalDeclContext()->addDecl(Var);
Owner->makeDeclVisibleInContext(Var);
} else {
Owner->addDecl(Var);
if (Owner->isFunctionOrMethod())
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Var);
}
SemaRef.InstantiateAttrs(TemplateArgs, D, Var);
// Link instantiations of static data members back to the template from
// which they were instantiated.
if (Var->isStaticDataMember())
SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D,
TSK_ImplicitInstantiation);
if (Var->getAnyInitializer()) {
// We already have an initializer in the class.
} else if (D->getInit()) {
if (Var->isStaticDataMember() && !D->isOutOfLine())
SemaRef.PushExpressionEvaluationContext(Sema::ConstantEvaluated);
else
SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
// Instantiate the initializer.
SourceLocation LParenLoc, RParenLoc;
ASTOwningVector<Expr*> InitArgs(SemaRef);
if (!SemaRef.InstantiateInitializer(D->getInit(), TemplateArgs, LParenLoc,
InitArgs, RParenLoc)) {
bool TypeMayContainAuto = true;
if (D->hasCXXDirectInitializer()) {
// Add the direct initializer to the declaration.
SemaRef.AddCXXDirectInitializerToDecl(Var,
LParenLoc,
move_arg(InitArgs),
RParenLoc,
TypeMayContainAuto);
} else if (InitArgs.size() == 0) {
SemaRef.ActOnUninitializedDecl(Var, TypeMayContainAuto);
} else {
assert(InitArgs.size() == 1);
Expr *Init = InitArgs.take()[0];
SemaRef.AddInitializerToDecl(Var, Init, false, TypeMayContainAuto);
}
} else {
// FIXME: Not too happy about invalidating the declaration
// because of a bogus initializer.
Var->setInvalidDecl();
}
SemaRef.PopExpressionEvaluationContext();
} else if ((!Var->isStaticDataMember() || Var->isOutOfLine()) &&
!Var->isCXXForRangeDecl())
SemaRef.ActOnUninitializedDecl(Var, false);
// Diagnose unused local variables with dependent types, where the diagnostic
// will have been deferred.
if (!Var->isInvalidDecl() && Owner->isFunctionOrMethod() && !Var->isUsed() &&
D->getType()->isDependentType())
SemaRef.DiagnoseUnusedDecl(Var);
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->hasInClassInitializer(),
D->getTypeSpecStartLoc(),
D->getAccess(),
0);
if (!Field) {
cast<Decl>(Owner)->setInvalidDecl();
return 0;
}
SemaRef.InstantiateAttrs(TemplateArgs, D, 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::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
NamedDecl **NamedChain =
new (SemaRef.Context)NamedDecl*[D->getChainingSize()];
int i = 0;
for (IndirectFieldDecl::chain_iterator PI =
D->chain_begin(), PE = D->chain_end();
PI != PE; ++PI) {
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->getLocation(),
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;
ExprResult Message(D->getMessage());
D->getMessage();
return SemaRef.ActOnStaticAssertDeclaration(D->getLocation(),
InstantiatedAssertExpr.get(),
Message.get(),
D->getRParenLoc());
}
Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) {
EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, D->getLocStart(),
D->getLocation(), D->getIdentifier(),
/*PrevDecl=*/0, 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();
Enum->setIntegerTypeSourceInfo(SemaRef.SubstType(TI,
TemplateArgs,
UnderlyingLoc,
DeclarationName()));
if (!Enum->getIntegerTypeSourceInfo())
Enum->setIntegerType(SemaRef.Context.IntTy);
}
else {
assert(!D->getIntegerType()->isDependentType()
&& "Dependent type without type source info");
Enum->setIntegerType(D->getIntegerType());
}
}
SemaRef.InstantiateAttrs(TemplateArgs, D, Enum);
Enum->setInstantiationOfMemberEnum(D);
Enum->setAccess(D->getAccess());
if (SubstQualifier(D, Enum)) return 0;
Owner->addDecl(Enum);
Enum->startDefinition();
if (D->getDeclContext()->isFunctionOrMethod())
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Enum);
SmallVector<Decl*, 4> Enumerators;
EnumConstantDecl *LastEnumConst = 0;
for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(),
ECEnd = D->enumerator_end();
EC != ECEnd; ++EC) {
// 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 (D->getDeclContext()->isFunctionOrMethod()) {
// If the enumeration is within a function or method, record the enum
// constant as a local.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(*EC, EnumConst);
}
}
}
// FIXME: Fixup LBraceLoc and RBraceLoc
// FIXME: Empty Scope and AttributeList (required to handle attribute packed).
SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(),
Enum,
Enumerators.data(), Enumerators.size(),
0, 0);
return Enum;
}
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.first != Found.second) {
PrevClassTemplate = dyn_cast<ClassTemplateDecl>(*Found.first);
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(PrevClassTemplate != 0);
// 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, /*Recoverable*/ false);
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]->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.first == Found.second)
return 0;
ClassTemplateDecl *InstClassTemplate
= dyn_cast<ClassTemplateDecl>(*Found.first);
if (!InstClassTemplate)
return 0;
if (ClassTemplatePartialSpecializationDecl *Result
= InstClassTemplate->findPartialSpecInstantiatedFromMember(D))
return Result;
return InstantiateClassTemplatePartialSpecialization(InstClassTemplate, 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;
Instantiated->setAccess(D->getAccess());
// 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);
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 (Decl::FriendObjectKind FOK = D->getFriendObjectKind())
Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared);
// Make sure that anonymous structs and unions are recorded.
if (D->isAnonymousStructOrUnion()) {
Record->setAnonymousStructOrUnion(true);
if (Record->getDeclContext()->getRedeclContext()->isFunctionOrMethod())
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Record);
}
Owner->addDecl(Record);
return Record;
}
/// 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
/// FIXME: preserve function definitions in case #2
Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D,
TemplateParameterList *TemplateParams) {
// Check whether there is already a function template specialization for
// this declaration.
FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
void *InsertPos = 0;
if (FunctionTemplate && !TemplateParams) {
std::pair<const TemplateArgument *, unsigned> Innermost
= TemplateArgs.getInnermost();
FunctionDecl *SpecFunc
= FunctionTemplate->findSpecialization(Innermost.first, Innermost.second,
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 = TInfo->getType();
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 owner; otherwise we need to find the instantiated context.
DeclContext *DC;
if (D->getDeclContext()->isFunctionOrMethod())
DC = Owner;
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->getLocation(), D->getDeclName(), T, TInfo,
D->getStorageClass(), D->getStorageClassAsWritten(),
D->isInlineSpecified(), D->hasWrittenPrototype(),
/*isConstexpr*/ false);
if (QualifierLoc)
Function->setQualifierInfo(QualifierLoc);
DeclContext *LexicalDC = Owner;
if (!isFriend && D->isOutOfLine()) {
assert(D->getDeclContext()->isFileContext());
LexicalDC = D->getDeclContext();
}
Function->setLexicalDeclContext(LexicalDC);
// Attach the parameters
if (isa<FunctionProtoType>(Function->getType().IgnoreParens())) {
// Adopt the already-instantiated parameters into our own context.
for (unsigned P = 0; P < Params.size(); ++P)
if (Params[P])
Params[P]->setOwningFunction(Function);
} else {
// Since we were instantiated via a typedef of a function type, create
// new parameters.
const FunctionProtoType *Proto
= Function->getType()->getAs<FunctionProtoType>();
assert(Proto && "No function prototype in template instantiation?");
for (FunctionProtoType::arg_type_iterator AI = Proto->arg_type_begin(),
AE = Proto->arg_type_end(); AI != AE; ++AI) {
ParmVarDecl *Param
= SemaRef.BuildParmVarDeclForTypedef(Function, Function->getLocation(),
*AI);
Param->setScopeInfo(0, Params.size());
Params.push_back(Param);
}
}
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.
std::pair<const TemplateArgument *, unsigned> Innermost
= TemplateArgs.getInnermost();
Function->setFunctionTemplateSpecialization(FunctionTemplate,
TemplateArgumentList::CreateCopy(SemaRef.Context,
Innermost.first,
Innermost.second),
InsertPos);
} 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(),
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(/*HasPrevious*/ true);
// 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) {
NamedDecl *PrevDecl;
if (TemplateParams)
PrevDecl = FunctionTemplate->getPreviousDecl();
else
PrevDecl = Function->getPreviousDecl();
PrincipalDecl->setObjectOfFriendDecl(PrevDecl != 0);
DC->makeDeclVisibleInContext(PrincipalDecl, /*Recoverable=*/ false);
bool queuedInstantiation = false;
// C++98 [temp.friend]p5: When a function is defined in a friend function
// declaration in a class template, the function is defined at each
// instantiation of the class template. The function is defined even if it
// is never used.
// C++11 [temp.friend]p4: When a function is defined in a friend function
// declaration in a class template, the function is instantiated when the
// function is odr-used.
//
// If -Wc++98-compat is enabled, we go through the motions of checking for a
// redefinition, but don't instantiate the function.
if ((!SemaRef.getLangOptions().CPlusPlus0x ||
SemaRef.Diags.getDiagnosticLevel(
diag::warn_cxx98_compat_friend_redefinition,
Function->getLocation())
!= DiagnosticsEngine::Ignored) &&
D->isThisDeclarationADefinition()) {
// Check for a function body.
const FunctionDecl *Definition = 0;
if (Function->isDefined(Definition) &&
Definition->getTemplateSpecializationKind() == TSK_Undeclared) {
SemaRef.Diag(Function->getLocation(),
SemaRef.getLangOptions().CPlusPlus0x ?
diag::warn_cxx98_compat_friend_redefinition :
diag::err_redefinition) << Function->getDeclName();
SemaRef.Diag(Definition->getLocation(), diag::note_previous_definition);
if (!SemaRef.getLangOptions().CPlusPlus0x)
Function->setInvalidDecl();
}
// Check for redefinitions due to other instantiations of this or
// a similar friend function.
else for (FunctionDecl::redecl_iterator R = Function->redecls_begin(),
REnd = Function->redecls_end();
R != REnd; ++R) {
if (*R == Function)
continue;
switch (R->getFriendObjectKind()) {
case Decl::FOK_None:
if (!SemaRef.getLangOptions().CPlusPlus0x &&
!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;
}
}
}
break;
default:
if (const FunctionDecl *RPattern
= R->getTemplateInstantiationPattern())
if (RPattern->isDefined(RPattern)) {
SemaRef.Diag(Function->getLocation(),
SemaRef.getLangOptions().CPlusPlus0x ?
diag::warn_cxx98_compat_friend_redefinition :
diag::err_redefinition)
<< Function->getDeclName();
SemaRef.Diag(R->getLocation(), diag::note_previous_definition);
if (!SemaRef.getLangOptions().CPlusPlus0x)
Function->setInvalidDecl();
break;
}
}
}
}
}
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();
void *InsertPos = 0;
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.
std::pair<const TemplateArgument *, unsigned> Innermost
= TemplateArgs.getInnermost();
FunctionDecl *SpecFunc
= FunctionTemplate->findSpecialization(Innermost.first, Innermost.second,
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 = D->getTypeSourceInfo();
TInfo = SubstFunctionType(D, Params);
if (!TInfo)
return 0;
QualType T = TInfo->getType();
// \brief If the type of this function, after ignoring parentheses,
// is not *directly* a function type, then we're instantiating a function
// that was declared via a typedef, e.g.,
//
// typedef int functype(int, int);
// functype func;
//
// In this case, we'll just go instantiate the ParmVarDecls that we
// synthesized in the method declaration.
if (!isa<FunctionProtoType>(T.IgnoreParens())) {
assert(!Params.size() && "Instantiating type could not yield parameters");
SmallVector<QualType, 4> ParamTypes;
if (SemaRef.SubstParmTypes(D->getLocation(), D->param_begin(),
D->getNumParams(), TemplateArgs, ParamTypes,
&Params))
return 0;
}
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, /*isConstexpr*/ false);
} 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(),
/*isConstexpr*/ false,
Conversion->getLocEnd());
} else {
Method = CXXMethodDecl::Create(SemaRef.Context, Record,
StartLoc, NameInfo, T, TInfo,
D->isStatic(),
D->getStorageClassAsWritten(),
D->isInlineSpecified(),
/*isConstexpr*/ false, D->getLocEnd());
}
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(true);
} else if (D->isOutOfLine())
FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext());
Method->setDescribedFunctionTemplate(FunctionTemplate);
} else if (FunctionTemplate) {
// Record this function template specialization.
std::pair<const TemplateArgument *, unsigned> Innermost
= TemplateArgs.getInnermost();
Method->setFunctionTemplateSpecialization(FunctionTemplate,
TemplateArgumentList::CreateCopy(SemaRef.Context,
Innermost.first,
Innermost.second),
InsertPos);
} 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(true);
} 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());
Method->setAccess(D->getAccess());
SemaRef.CheckOverrideControl(Method);
// If a function is defined as defaulted or deleted, mark it as such now.
if (D->isDefaulted())
Method->setDefaulted();
if (D->isDeletedAsWritten())
Method->setDeletedAsWritten();
if (FunctionTemplate) {
// If there's a function template, let our caller handle it.
} else if (Method->isInvalidDecl() && !Previous.empty()) {
// Don't hide a (potentially) valid declaration with an invalid one.
} else {
NamedDecl *DeclToAdd = (TemplateParams
? cast<NamedDecl>(FunctionTemplate)
: Method);
if (isFriend)
Record->makeDeclVisibleInContext(DeclToAdd);
else if (!IsClassScopeSpecialization)
Owner->addDecl(DeclToAdd);
}
if (D->isExplicitlyDefaulted()) {
SemaRef.SetDeclDefaulted(Method, Method->getLocation());
} else {
assert(!D->isDefaulted() &&
"should not implicitly default uninstantiated function");
}
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);
}
ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) {
return SemaRef.SubstParmVarDecl(D, TemplateArgs, /*indexAdjustment*/ 0,
llvm::Optional<unsigned>());
}
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())
Inst->setDefaultArgument(D->getDefaultArgumentInfo(), 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 (isa<PackExpansionTypeLoc>(TL)) {
// 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 = cast<PackExpansionTypeLoc>(TL);
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;
llvm::Optional<unsigned> OrigNumExpansions
= Expansion.getTypePtr()->getNumExpansions();
llvm::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();
Param->setDefaultArgument(D->getDefaultArgument(), false);
// Introduce this template parameter's instantiation into the instantiation
// scope.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
return Param;
}
Decl *
TemplateDeclInstantiator::VisitTemplateTemplateParmDecl(
TemplateTemplateParmDecl *D) {
// Instantiate the template parameter list of the template template parameter.
TemplateParameterList *TempParams = D->getTemplateParameters();
TemplateParameterList *InstParams;
{
// Perform the actual substitution of template parameters within a new,
// local instantiation scope.
LocalInstantiationScope Scope(SemaRef);
InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return NULL;
}
// Build the template template parameter.
TemplateTemplateParmDecl *Param
= TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getDepth() - TemplateArgs.getNumLevels(),
D->getPosition(), D->isParameterPack(),
D->getIdentifier(), InstParams);
Param->setDefaultArgument(D->getDefaultArgument(), 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());
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->getUsingLocation(),
QualifierLoc,
NameInfo,
D->isTypeName());
CXXScopeSpec SS;
SS.Adopt(QualifierLoc);
if (CheckRedeclaration) {
Prev.setHideTags(false);
SemaRef.LookupQualifiedName(Prev, Owner);
// Check for invalid redeclarations.
if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(),
D->isTypeName(), SS,
D->getLocation(), Prev))
NewUD->setInvalidDecl();
}
if (!NewUD->isInvalidDecl() &&
SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS,
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;
bool isFunctionScope = Owner->isFunctionOrMethod();
// Process the shadow decls.
for (UsingDecl::shadow_iterator I = D->shadow_begin(), E = D->shadow_end();
I != E; ++I) {
UsingShadowDecl *Shadow = *I;
NamedDecl *InstTarget =
cast_or_null<NamedDecl>(SemaRef.FindInstantiatedDecl(
Shadow->getLocation(),
Shadow->getTargetDecl(),
TemplateArgs));
if (!InstTarget)
return 0;
if (CheckRedeclaration &&
SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev))
continue;
UsingShadowDecl *InstShadow
= SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget);
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 tranformation 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);
SemaRef.LookupQualifiedName(Previous, SemaRef.CurContext);
if (SemaRef.CheckFunctionTemplateSpecialization(NewFD, 0, 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 *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.
TemplateArgumentListInfo InstTemplateArgs; // no angle locations
if (SemaRef.Subst(PartialSpec->getTemplateArgsAsWritten(),
PartialSpec->getNumTemplateArgsAsWritten(),
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,
ClassTemplate->getNextPartialSpecSequenceNumber());
// 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);
return InstPartialSpec;
}
TypeSourceInfo*
TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D,
SmallVectorImpl<ParmVarDecl *> &Params) {
TypeSourceInfo *OldTInfo = D->getTypeSourceInfo();
assert(OldTInfo && "substituting function without type source info");
assert(Params.empty() && "parameter vector is non-empty at start");
TypeSourceInfo *NewTInfo
= SemaRef.SubstFunctionDeclType(OldTInfo, TemplateArgs,
D->getTypeSpecStartLoc(),
D->getDeclName());
if (!NewTInfo)
return 0;
if (NewTInfo != OldTInfo) {
// Get parameters from the new type info.
TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens();
if (FunctionProtoTypeLoc *OldProtoLoc
= dyn_cast<FunctionProtoTypeLoc>(&OldTL)) {
TypeLoc NewTL = NewTInfo->getTypeLoc().IgnoreParens();
FunctionProtoTypeLoc *NewProtoLoc = cast<FunctionProtoTypeLoc>(&NewTL);
assert(NewProtoLoc && "Missing prototype?");
unsigned NewIdx = 0, NumNewParams = NewProtoLoc->getNumArgs();
for (unsigned OldIdx = 0, NumOldParams = OldProtoLoc->getNumArgs();
OldIdx != NumOldParams; ++OldIdx) {
ParmVarDecl *OldParam = OldProtoLoc->getArg(OldIdx);
if (!OldParam->isParameterPack() ||
(NewIdx < NumNewParams &&
NewProtoLoc->getArg(NewIdx)->isParameterPack())) {
// Simple case: normal parameter, or a parameter pack that's
// instantiated to a (still-dependent) parameter pack.
ParmVarDecl *NewParam = NewProtoLoc->getArg(NewIdx++);
Params.push_back(NewParam);
SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam,
NewParam);
continue;
}
// Parameter pack: make the instantiation an argument pack.
SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(
OldParam);
unsigned NumArgumentsInExpansion
= SemaRef.getNumArgumentsInExpansion(OldParam->getType(),
TemplateArgs);
while (NumArgumentsInExpansion--) {
ParmVarDecl *NewParam = NewProtoLoc->getArg(NewIdx++);
Params.push_back(NewParam);
SemaRef.CurrentInstantiationScope->InstantiatedLocalPackArg(OldParam,
NewParam);
}
}
}
} else {
// The function type itself was not dependent and therefore no
// substitution occurred. However, we still need to instantiate
// the function parameters themselves.
TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens();
if (FunctionProtoTypeLoc *OldProtoLoc
= dyn_cast<FunctionProtoTypeLoc>(&OldTL)) {
for (unsigned i = 0, i_end = OldProtoLoc->getNumArgs(); i != i_end; ++i) {
ParmVarDecl *Parm = VisitParmVarDecl(OldProtoLoc->getArg(i));
if (!Parm)
return 0;
Params.push_back(Parm);
}
}
}
return NewTInfo;
}
/// \brief Initializes the common fields of an instantiation function
/// declaration (New) from the corresponding fields of its template (Tmpl).
///
/// \returns true if there was an error
bool
TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New,
FunctionDecl *Tmpl) {
if (Tmpl->isDeletedAsWritten())
New->setDeletedAsWritten();
// If we are performing substituting explicitly-specified template arguments
// or deduced template arguments into a function template and we reach this
// point, we are now past the point where SFINAE applies and have committed
// to keeping the new function template specialization. We therefore
// convert the active template instantiation for the function template
// into a template instantiation for this specific function template
// specialization, which is not a SFINAE context, so that we diagnose any
// further errors in the declaration itself.
typedef Sema::ActiveTemplateInstantiation ActiveInstType;
ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back();
if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution ||
ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) {
if (FunctionTemplateDecl *FunTmpl
= dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) {
assert(FunTmpl->getTemplatedDecl() == Tmpl &&
"Deduction from the wrong function template?");
(void) FunTmpl;
ActiveInst.Kind = ActiveInstType::TemplateInstantiation;
ActiveInst.Entity = reinterpret_cast<uintptr_t>(New);
--SemaRef.NonInstantiationEntries;
}
}
const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>();
assert(Proto && "Function template without prototype?");
if (Proto->hasExceptionSpec() || Proto->getNoReturnAttr()) {
// The function has an exception specification or a "noreturn"
// attribute. Substitute into each of the exception types.
SmallVector<QualType, 4> Exceptions;
for (unsigned I = 0, N = Proto->getNumExceptions(); I != N; ++I) {
// FIXME: Poor location information!
if (const PackExpansionType *PackExpansion
= Proto->getExceptionType(I)->getAs<PackExpansionType>()) {
// We have a pack expansion. Instantiate it.
SmallVector<UnexpandedParameterPack, 2> Unexpanded;
SemaRef.collectUnexpandedParameterPacks(PackExpansion->getPattern(),
Unexpanded);
assert(!Unexpanded.empty() &&
"Pack expansion without parameter packs?");
bool Expand = false;
bool RetainExpansion = false;
llvm::Optional<unsigned> NumExpansions
= PackExpansion->getNumExpansions();
if (SemaRef.CheckParameterPacksForExpansion(New->getLocation(),
SourceRange(),
Unexpanded,
TemplateArgs,
Expand,
RetainExpansion,
NumExpansions))
break;
if (!Expand) {
// We can't expand this pack expansion into separate arguments yet;
// just substitute into the pattern and create a new pack expansion
// type.
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1);
QualType T = SemaRef.SubstType(PackExpansion->getPattern(),
TemplateArgs,
New->getLocation(), New->getDeclName());
if (T.isNull())
break;
T = SemaRef.Context.getPackExpansionType(T, NumExpansions);
Exceptions.push_back(T);
continue;
}
// Substitute into the pack expansion pattern for each template
bool Invalid = false;
for (unsigned ArgIdx = 0; ArgIdx != *NumExpansions; ++ArgIdx) {
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, ArgIdx);
QualType T = SemaRef.SubstType(PackExpansion->getPattern(),
TemplateArgs,
New->getLocation(), New->getDeclName());
if (T.isNull()) {
Invalid = true;
break;
}
Exceptions.push_back(T);
}
if (Invalid)
break;
continue;
}
QualType T
= SemaRef.SubstType(Proto->getExceptionType(I), TemplateArgs,
New->getLocation(), New->getDeclName());
if (T.isNull() ||
SemaRef.CheckSpecifiedExceptionType(T, New->getLocation()))
continue;
Exceptions.push_back(T);
}
Expr *NoexceptExpr = 0;
if (Expr *OldNoexceptExpr = Proto->getNoexceptExpr()) {
EnterExpressionEvaluationContext Unevaluated(SemaRef,
Sema::ConstantEvaluated);
ExprResult E = SemaRef.SubstExpr(OldNoexceptExpr, TemplateArgs);
if (E.isUsable())
E = SemaRef.CheckBooleanCondition(E.get(), E.get()->getLocStart());
if (E.isUsable()) {
SourceLocation ErrLoc;
llvm::APSInt NoexceptVal;
NoexceptExpr = E.take();
if (!NoexceptExpr->isTypeDependent() &&
!NoexceptExpr->isValueDependent() &&
!NoexceptExpr->isIntegerConstantExpr(NoexceptVal, SemaRef.Context,
&ErrLoc, /*evaluated=*/false)){
SemaRef.Diag(ErrLoc, diag::err_noexcept_needs_constant_expression)
<< NoexceptExpr->getSourceRange();
NoexceptExpr = 0;
}
}
}
// Rebuild the function type
FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
EPI.ExceptionSpecType = Proto->getExceptionSpecType();
EPI.NumExceptions = Exceptions.size();
EPI.Exceptions = Exceptions.data();
EPI.NoexceptExpr = NoexceptExpr;
EPI.ExtInfo = Proto->getExtInfo();
const FunctionProtoType *NewProto
= New->getType()->getAs<FunctionProtoType>();
assert(NewProto && "Template instantiation without function prototype?");
New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(),
NewProto->arg_type_begin(),
NewProto->getNumArgs(),
EPI));
}
// C++0x [dcl.constexpr]p6: If the instantiated template specialization of
// a constexpr function template satisfies the requirements for a constexpr
// function, then it is a constexpr function.
if (Tmpl->isConstexpr() &&
SemaRef.CheckConstexprFunctionDecl(New, Sema::CCK_Instantiation))
New->setConstexpr(true);
const FunctionDecl* Definition = Tmpl;
// Get the definition. Leaves the variable unchanged if undefined.
Tmpl->isDefined(Definition);
SemaRef.InstantiateAttrs(TemplateArgs, Definition, New);
return false;
}
/// \brief Initializes common fields of an instantiated method
/// declaration (New) from the corresponding fields of its template
/// (Tmpl).
///
/// \returns true if there was an error
bool
TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New,
CXXMethodDecl *Tmpl) {
if (InitFunctionInstantiation(New, Tmpl))
return true;
New->setAccess(Tmpl->getAccess());
if (Tmpl->isVirtualAsWritten())
New->setVirtualAsWritten(true);
// FIXME: attributes
// FIXME: New needs a pointer to Tmpl
return false;
}
/// \brief Instantiate the definition of the given function from its
/// template.
///
/// \param PointOfInstantiation the point at which the instantiation was
/// required. Note that this is not precisely a "point of instantiation"
/// for the function, but it's close.
///
/// \param Function the already-instantiated declaration of a
/// function template specialization or member function of a class template
/// specialization.
///
/// \param Recursive if true, recursively instantiates any functions that
/// are required by this instantiation.
///
/// \param DefinitionRequired if true, then we are performing an explicit
/// instantiation where the body of the function is required. Complain if
/// there is no such body.
void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
FunctionDecl *Function,
bool Recursive,
bool DefinitionRequired) {
if (Function->isInvalidDecl() || Function->isDefined())
return;
// Never instantiate an explicit specialization except if it is a class scope
// explicit specialization.
if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization &&
!Function->getClassScopeSpecializationPattern())
return;
// Find the function body that we'll be substituting.
const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern();
assert(PatternDecl && "instantiating a non-template");
Stmt *Pattern = PatternDecl->getBody(PatternDecl);
assert(PatternDecl && "template definition is not a template");
if (!Pattern) {
// Try to find a defaulted definition
PatternDecl->isDefined(PatternDecl);
}
assert(PatternDecl && "template definition is not a template");
// Postpone late parsed template instantiations.
if (PatternDecl->isLateTemplateParsed() &&
!LateTemplateParser) {
PendingInstantiations.push_back(
std::make_pair(Function, PointOfInstantiation));
return;
}
// Call the LateTemplateParser callback if there a need to late parse
// a templated function definition.
if (!Pattern && PatternDecl->isLateTemplateParsed() &&
LateTemplateParser) {
LateTemplateParser(OpaqueParser, PatternDecl);
Pattern = PatternDecl->getBody(PatternDecl);
}
if (!Pattern && !PatternDecl->isDefaulted()) {
if (DefinitionRequired) {
if (Function->getPrimaryTemplate())
Diag(PointOfInstantiation,
diag::err_explicit_instantiation_undefined_func_template)
<< Function->getPrimaryTemplate();
else
Diag(PointOfInstantiation,
diag::err_explicit_instantiation_undefined_member)
<< 1 << Function->getDeclName() << Function->getDeclContext();
if (PatternDecl)
Diag(PatternDecl->getLocation(),
diag::note_explicit_instantiation_here);
Function->setInvalidDecl();
} else if (Function->getTemplateSpecializationKind()
== TSK_ExplicitInstantiationDefinition) {
PendingInstantiations.push_back(
std::make_pair(Function, PointOfInstantiation));
}
return;
}
// C++0x [temp.explicit]p9:
// Except for inline functions, other explicit instantiation declarations
// have the effect of suppressing the implicit instantiation of the entity
// to which they refer.
if (Function->getTemplateSpecializationKind()
== TSK_ExplicitInstantiationDeclaration &&
!PatternDecl->isInlined())
return;
InstantiatingTemplate Inst(*this, PointOfInstantiation, Function);
if (Inst)
return;
// Copy the inner loc start from the pattern.
Function->setInnerLocStart(PatternDecl->getInnerLocStart());
// If we're performing recursive template instantiation, create our own
// queue of pending implicit instantiations that we will instantiate later,
// while we're still within our own instantiation context.
SmallVector<VTableUse, 16> SavedVTableUses;
std::deque<PendingImplicitInstantiation> SavedPendingInstantiations;
if (Recursive) {
VTableUses.swap(SavedVTableUses);
PendingInstantiations.swap(SavedPendingInstantiations);
}
EnterExpressionEvaluationContext EvalContext(*this,
Sema::PotentiallyEvaluated);
ActOnStartOfFunctionDef(0, Function);
// Introduce a new scope where local variable instantiations will be
// recorded, unless we're actually a member function within a local
// class, in which case we need to merge our results with the parent
// scope (of the enclosing function).
bool MergeWithParentScope = false;
if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Function->getDeclContext()))
MergeWithParentScope = Rec->isLocalClass();
LocalInstantiationScope Scope(*this, MergeWithParentScope);
// Introduce the instantiated function parameters into the local
// instantiation scope, and set the parameter names to those used
// in the template.
unsigned FParamIdx = 0;
for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I) {
const ParmVarDecl *PatternParam = PatternDecl->getParamDecl(I);
if (!PatternParam->isParameterPack()) {
// Simple case: not a parameter pack.
assert(FParamIdx < Function->getNumParams());
ParmVarDecl *FunctionParam = Function->getParamDecl(I);
FunctionParam->setDeclName(PatternParam->getDeclName());
Scope.InstantiatedLocal(PatternParam, FunctionParam);