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freebsd-dev/contrib/llvm/tools/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
Dimitry Andric f785676f2a Upgrade our copy of llvm/clang to 3.4 release. This version supports 
all of the features in the current working draft of the upcoming C++
standard, provisionally named C++1y.

The code generator's performance is greatly increased, and the loop
auto-vectorizer is now enabled at -Os and -O2 in addition to -O3.  The
PowerPC backend has made several major improvements to code generation
quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ
backends have all seen major feature work.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.4/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html>

MFC after:	1 month
2014-02-16 19:44:07 +00:00

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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/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);
}
}
}
void Sema::InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
const Decl *Tmpl, Decl *New,
LateInstantiatedAttrVec *LateAttrs,
LocalInstantiationScope *OuterMostScope) {
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.
const AlignedAttr *Aligned = dyn_cast<AlignedAttr>(TmplAttr);
if (Aligned && Aligned->isAlignmentDependent()) {
instantiateDependentAlignedAttr(*this, TemplateArgs, Aligned, 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->getName();
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 = new (SemaRef.Context)
MSPropertyDecl(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 (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->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());
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 (EnumDecl::enumerator_iterator EC = Pattern->enumerator_begin(),
ECEnd = Pattern->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 (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, PrevVarTemplate);
VarInst->setDescribedVarTemplate(Inst);
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);
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()) {
if (SemaRef.InstantiateClass(D->getLocation(), Record, D, TemplateArgs,
TSK_ImplicitInstantiation,
/*Complain=*/true)) {
llvm_unreachable("InstantiateClass shouldn't fail here!");
} else {
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->getResultType(),
NewFunc->getArgTypes(), 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
/// 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();
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++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.getLangOpts().CPlusPlus11 ||
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.getLangOpts().CPlusPlus11 ?
diag::warn_cxx98_compat_friend_redefinition :
diag::err_redefinition) << Function->getDeclName();
SemaRef.Diag(Definition->getLocation(), diag::note_previous_definition);
if (!SemaRef.getLangOpts().CPlusPlus11)
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.getLangOpts().CPlusPlus11 &&
!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.getLangOpts().CPlusPlus11 ?
diag::warn_cxx98_compat_friend_redefinition :
diag::err_redefinition)
<< Function->getDeclName();
SemaRef.Diag(R->getLocation(), diag::note_previous_definition);
if (!SemaRef.getLangOpts().CPlusPlus11)
Function->setInvalidDecl();
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,
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 (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;
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 (ArrayRef<Expr *>::iterator I = D->varlist_begin(),
E = D->varlist_end();
I != E; ++I) {
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);
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;
bool ExpansionIntoFixedList = false;
if (SemaRef.CheckTemplateArgumentList(
VarTemplate, VarTemplate->getLocStart(),
const_cast<TemplateArgumentListInfo &>(VarTemplateArgsInfo), false,
Converted, &ExpansionIntoFixedList))
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
// class template.
SmallVector<TemplateArgument, 4> Converted;
if (SemaRef.CheckTemplateArgumentList(VarTemplate, PartialSpec->getLocation(),
InstTemplateArgs, false, Converted))
return 0;
// Figure out where to insert this variable template partial specialization
// in the member template's set of variable template partial specializations.
void *InsertPos = 0;
VarTemplateSpecializationDecl *PrevDecl =
VarTemplate->findPartialSpecialization(Converted.data(), Converted.size(),
InsertPos);
// Build the canonical type that describes the converted template
// arguments of the variable template partial specialization.
QualType CanonType = SemaRef.Context.getTemplateSpecializationType(
TemplateName(VarTemplate), Converted.data(), Converted.size());
// Build the fully-sugared type for this variable 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(VarTemplate), 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
// variable template partial specializations of a member variable template
// to have identical forms, e.g.,
//
// template<typename T, typename U>
// struct Outer {
// template<typename X, typename Y> pair<X,Y> p;
// template<typename Y> pair<T, Y> p;
// template<typename Y> pair<U, Y> p;
// };
//
// Outer<int, int> outer; // error: the partial specializations of Inner
// // have the same signature.
SemaRef.Diag(PartialSpec->getLocation(),
diag::err_var_partial_spec_redeclared)
<< WrittenTy->getType();
SemaRef.Diag(PrevDecl->getLocation(),
diag::note_var_prev_partial_spec_here);
return 0;
}
// Do substitution on the type of the declaration
TypeSourceInfo *DI = SemaRef.SubstType(
PartialSpec->getTypeSourceInfo(), TemplateArgs,
PartialSpec->getTypeSpecStartLoc(), PartialSpec->getDeclName());
if (!DI)
return 0;
if (DI->getType()->isFunctionType()) {
SemaRef.Diag(PartialSpec->getLocation(),
diag::err_variable_instantiates_to_function)
<< PartialSpec->isStaticDataMember() << DI->getType();
return 0;
}
// Create the variable template partial specialization declaration.
VarTemplatePartialSpecializationDecl *InstPartialSpec =
VarTemplatePartialSpecializationDecl::Create(
SemaRef.Context, Owner, PartialSpec->getInnerLocStart(),
PartialSpec->getLocation(), InstParams, VarTemplate, DI->getType(),
DI, PartialSpec->getStorageClass(), Converted.data(),
Converted.size(), InstTemplateArgs);
// 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 variable template partial
// specializations. The instantiation of the initializer is not necessary.
VarTemplate->AddPartialSpecialization(InstPartialSpec, /*InsertPos=*/0);
SemaRef.BuildVariableInstantiation(InstPartialSpec, PartialSpec, TemplateArgs,
LateAttrs, Owner, StartingScope);
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");
CXXRecordDecl *ThisContext = 0;
unsigned ThisTypeQuals = 0;
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
ThisContext = cast<CXXRecordDecl>(Owner);
ThisTypeQuals = Method->getTypeQualifiers();
}
TypeSourceInfo *NewTInfo
= SemaRef.SubstFunctionDeclType(OldTInfo, TemplateArgs,
D->getTypeSpecStartLoc(),
D->getDeclName(),
ThisContext, ThisTypeQuals);
if (!NewTInfo)
return 0;
TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens();
if (FunctionProtoTypeLoc OldProtoLoc = OldTL.getAs<FunctionProtoTypeLoc>()) {
if (NewTInfo != OldTInfo) {
// Get parameters from the new type info.
TypeLoc NewTL = NewTInfo->getTypeLoc().IgnoreParens();
FunctionProtoTypeLoc NewProtoLoc = NewTL.castAs<FunctionProtoTypeLoc>();
unsigned NewIdx = 0;
for (unsigned OldIdx = 0, NumOldParams = OldProtoLoc.getNumArgs();
OldIdx != NumOldParams; ++OldIdx) {
ParmVarDecl *OldParam = OldProtoLoc.getArg(OldIdx);
LocalInstantiationScope *Scope = SemaRef.CurrentInstantiationScope;
Optional<unsigned> NumArgumentsInExpansion;
if (OldParam->isParameterPack())
NumArgumentsInExpansion =
SemaRef.getNumArgumentsInExpansion(OldParam->getType(),
TemplateArgs);
if (!NumArgumentsInExpansion) {
// 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);
Scope->InstantiatedLocal(OldParam, NewParam);
} else {
// Parameter pack expansion: make the instantiation an argument pack.
Scope->MakeInstantiatedLocalArgPack(OldParam);
for (unsigned I = 0; I != *NumArgumentsInExpansion; ++I) {
ParmVarDecl *NewParam = NewProtoLoc.getArg(NewIdx++);
Params.push_back(NewParam);
Scope->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.
const FunctionProtoType *OldProto =
cast<FunctionProtoType>(OldProtoLoc.getType());
for (unsigned i = 0, i_end = OldProtoLoc.getNumArgs(); i != i_end; ++i) {
ParmVarDecl *OldParam = OldProtoLoc.getArg(i);
if (!OldParam) {
Params.push_back(SemaRef.BuildParmVarDeclForTypedef(
D, D->getLocation(), OldProto->getArgType(i)));
continue;
}
ParmVarDecl *Parm =
cast_or_null<ParmVarDecl>(VisitParmVarDecl(OldParam));
if (!Parm)
return 0;
Params.push_back(Parm);
}
}
} else {
// 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 or with attributes, e.g.,
//
// typedef int functype(int, int);
// functype func;
// int __cdecl meth(int, int);
//
// In this case, we'll just go instantiate the ParmVarDecls that we
// synthesized in the method declaration.
SmallVector<QualType, 4> ParamTypes;
if (SemaRef.SubstParmTypes(D->getLocation(), D->param_begin(),
D->getNumParams(), TemplateArgs, ParamTypes,
&Params))
return 0;
}
return NewTInfo;
}
/// Introduce the instantiated function parameters into the local
/// instantiation scope, and set the parameter names to those used
/// in the template.
static void addInstantiatedParametersToScope(Sema &S, FunctionDecl *Function,
const FunctionDecl *PatternDecl,
LocalInstantiationScope &Scope,
const MultiLevelTemplateArgumentList &TemplateArgs) {
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(FParamIdx);
FunctionParam->setDeclName(PatternParam->getDeclName());
Scope.InstantiatedLocal(PatternParam, FunctionParam);
++FParamIdx;
continue;
}
// Expand the parameter pack.
Scope.MakeInstantiatedLocalArgPack(PatternParam);
Optional<unsigned> NumArgumentsInExpansion
= S.getNumArgumentsInExpansion(PatternParam->getType(), TemplateArgs);
assert(NumArgumentsInExpansion &&
"should only be called when all template arguments are known");
for (unsigned Arg = 0; Arg < *NumArgumentsInExpansion; ++Arg) {
ParmVarDecl *FunctionParam = Function->getParamDecl(FParamIdx);
FunctionParam->setDeclName(PatternParam->getDeclName());
Scope.InstantiatedLocalPackArg(PatternParam, FunctionParam);
++FParamIdx;
}
}
}
static void InstantiateExceptionSpec(Sema &SemaRef, FunctionDecl *New,
const FunctionProtoType *Proto,
const MultiLevelTemplateArgumentList &TemplateArgs) {
assert(Proto->getExceptionSpecType() != EST_Uninstantiated);
// C++11 [expr.prim.general]p3:
// If a declaration declares a member function or member function
// template of a class X, the expression this is a prvalue of type
// "pointer to cv-qualifier-seq X" between the optional cv-qualifer-seq
// and the end of the function-definition, member-declarator, or
// declarator.
CXXRecordDecl *ThisContext = 0;
unsigned ThisTypeQuals = 0;
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(New)) {
ThisContext = Method->getParent();
ThisTypeQuals = Method->getTypeQualifiers();
}
Sema::CXXThisScopeRAII ThisScope(SemaRef, ThisContext, ThisTypeQuals,
SemaRef.getLangOpts().CPlusPlus11);
// 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;
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()) {
NoexceptExpr = E.take();
if (!NoexceptExpr->isTypeDependent() &&
!NoexceptExpr->isValueDependent())
NoexceptExpr
= SemaRef.VerifyIntegerConstantExpression(NoexceptExpr,
0, diag::err_noexcept_needs_constant_expression,
/*AllowFold*/ false).take();
}
}
// Rebuild the function type
const FunctionProtoType *NewProto
= New->getType()->getAs<FunctionProtoType>();
assert(NewProto && "Template instantiation without function prototype?");
FunctionProtoType::ExtProtoInfo EPI = NewProto->getExtProtoInfo();
EPI.ExceptionSpecType = Proto->getExceptionSpecType();
EPI.NumExceptions = Exceptions.size();
EPI.Exceptions = Exceptions.data();
EPI.NoexceptExpr = NoexceptExpr;
New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(),
NewProto->getArgTypes(), EPI));
}
void Sema::InstantiateExceptionSpec(SourceLocation PointOfInstantiation,
FunctionDecl *Decl) {
const FunctionProtoType *Proto = Decl->getType()->castAs<FunctionProtoType>();
if (Proto->getExceptionSpecType() != EST_Uninstantiated)
return;
InstantiatingTemplate Inst(*this, PointOfInstantiation, Decl,
InstantiatingTemplate::ExceptionSpecification());
if (Inst.isInvalid()) {
// We hit the instantiation depth limit. Clear the exception specification
// so that our callers don't have to cope with EST_Uninstantiated.
FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
EPI.ExceptionSpecType = EST_None;
Decl->setType(Context.getFunctionType(Proto->getResultType(),
Proto->getArgTypes(), EPI));
return;
}
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
Sema::ContextRAII savedContext(*this, Decl);
LocalInstantiationScope Scope(*this);
MultiLevelTemplateArgumentList TemplateArgs =
getTemplateInstantiationArgs(Decl, 0, /*RelativeToPrimary*/true);
FunctionDecl *Template = Proto->getExceptionSpecTemplate();
addInstantiatedParametersToScope(*this, Decl, Template, Scope, TemplateArgs);
::InstantiateExceptionSpec(*this, Decl,
Template->getType()->castAs<FunctionProtoType>(),
TemplateArgs);
}
/// \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->isDeleted())
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>(ActiveInst.Entity)) {
assert(FunTmpl->getTemplatedDecl() == Tmpl &&
"Deduction from the wrong function template?");
(void) FunTmpl;
ActiveInst.Kind = ActiveInstType::TemplateInstantiation;
ActiveInst.Entity = New;
}
}
const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>();
assert(Proto && "Function template without prototype?");
if (Proto->hasExceptionSpec() || Proto->getNoReturnAttr()) {
FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
// DR1330: In C++11, defer instantiation of a non-trivial
// exception specification.
if (SemaRef.getLangOpts().CPlusPlus11 &&
EPI.ExceptionSpecType != EST_None &&
EPI.ExceptionSpecType != EST_DynamicNone &&
EPI.ExceptionSpecType != EST_BasicNoexcept) {
FunctionDecl *ExceptionSpecTemplate = Tmpl;
if (EPI.ExceptionSpecType == EST_Uninstantiated)
ExceptionSpecTemplate = EPI.ExceptionSpecTemplate;
ExceptionSpecificationType NewEST = EST_Uninstantiated;
if (EPI.ExceptionSpecType == EST_Unevaluated)
NewEST = EST_Unevaluated;
// Mark the function has having an uninstantiated exception specification.
const FunctionProtoType *NewProto
= New->getType()->getAs<FunctionProtoType>();
assert(NewProto && "Template instantiation without function prototype?");
EPI = NewProto->getExtProtoInfo();
EPI.ExceptionSpecType = NewEST;
EPI.ExceptionSpecDecl = New;
EPI.ExceptionSpecTemplate = ExceptionSpecTemplate;
New->setType(SemaRef.Context.getFunctionType(
NewProto->getResultType(), NewProto->getArgTypes(), EPI));
} else {
::InstantiateExceptionSpec(SemaRef, New, Proto, TemplateArgs);
}
}
// Get the definition. Leaves the variable unchanged if undefined.
const FunctionDecl *Definition = Tmpl;
Tmpl->isDefined(Definition);
SemaRef.InstantiateAttrs(TemplateArgs, Definition, New,
LateAttrs, StartingScope);
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: 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 is a need to late parse
// a templated function definition.
if (!Pattern && PatternDecl->isLateTemplateParsed() &&
LateTemplateParser) {
// FIXME: Optimize to allow individual templates to be deserialized.
if (PatternDecl->isFromASTFile())
ExternalSource->ReadLateParsedTemplates(LateParsedTemplateMap);
LateParsedTemplate *LPT = LateParsedTemplateMap.lookup(PatternDecl);
assert(LPT && "missing LateParsedTemplate");
LateTemplateParser(OpaqueParser, *LPT);
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++1y [temp.explicit]p10:
// Except for inline functions, declarations with types deduced from their
// initializer or return value, and class template specializations, 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() &&
!PatternDecl->getResultType()->getContainedAutoType())
return;
if (PatternDecl->isInlined())
Function->setImplicitlyInline();
InstantiatingTemplate Inst(*this, PointOfInstantiation, Function);
if (Inst.isInvalid())
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;
SavePendingLocalImplicitInstantiationsRAII
SavedPendingLocalImplicitInstantiations(*this);
if (Recursive) {
VTableUses.swap(SavedVTableUses);
PendingInstantiations.swap(SavedPendingInstantiations);
}
EnterExpressionEvaluationContext EvalContext(*this,
Sema::PotentiallyEvaluated);
// 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);
if (PatternDecl->isDefaulted())
SetDeclDefaulted(Function, PatternDecl->getLocation());
else {
ActOnStartOfFunctionDef(0, Function);
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
Sema::ContextRAII savedContext(*this, Function);
MultiLevelTemplateArgumentList TemplateArgs =
getTemplateInstantiationArgs(Function, 0, false, PatternDecl);
addInstantiatedParametersToScope(*this, Function, PatternDecl, Scope,
TemplateArgs);
// If this is a constructor, instantiate the member initializers.
if (const CXXConstructorDecl *Ctor =
dyn_cast<CXXConstructorDecl>(PatternDecl)) {
InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor,
TemplateArgs);
}
// Instantiate the function body.
StmtResult Body = SubstStmt(Pattern, TemplateArgs);
if (Body.isInvalid())
Function->setInvalidDecl();
ActOnFinishFunctionBody(Function, Body.get(),
/*IsInstantiation=*/true);
PerformDependentDiagnostics(PatternDecl, TemplateArgs);
savedContext.pop();
}
DeclGroupRef DG(Function);
Consumer.HandleTopLevelDecl(DG);
// This class may have local implicit instantiations that need to be
// instantiation within this scope.
PerformPendingInstantiations(/*LocalOnly=*/true);
Scope.Exit();
if (Recursive) {
// Define any pending vtables.
DefineUsedVTables();
// Instantiate any pending implicit instantiations found during the
// instantiation of this template.
PerformPendingInstantiations();
// Restore the set of pending vtables.
assert(VTableUses.empty() &&
"VTableUses should be empty before it is discarded.");
VTableUses.swap(SavedVTableUses);
// Restore the set of pending implicit instantiations.
assert(PendingInstantiations.empty() &&
"PendingInstantiations should be empty before it is discarded.");
PendingInstantiations.swap(SavedPendingInstantiations);
}
}
VarTemplateSpecializationDecl *Sema::BuildVarTemplateInstantiation(
VarTemplateDecl *VarTemplate, VarDecl *FromVar,
const TemplateArgumentList &TemplateArgList,
const TemplateArgumentListInfo &TemplateArgsInfo,
SmallVectorImpl<TemplateArgument> &Converted,
SourceLocation PointOfInstantiation, void *InsertPos,
LateInstantiatedAttrVec *LateAttrs,
LocalInstantiationScope *StartingScope) {
if (FromVar->isInvalidDecl())
return 0;
InstantiatingTemplate Inst(*this, PointOfInstantiation, FromVar);
if (Inst.isInvalid())
return 0;
MultiLevelTemplateArgumentList TemplateArgLists;
TemplateArgLists.addOuterTemplateArguments(&TemplateArgList);
// Instantiate the first declaration of the variable template: for a partial
// specialization of a static data member template, the first declaration may
// or may not be the declaration in the class; if it's in the class, we want
// to instantiate a member in the class (a declaration), and if it's outside,
// we want to instantiate a definition.
FromVar = FromVar->getFirstDecl();
MultiLevelTemplateArgumentList MultiLevelList(TemplateArgList);
TemplateDeclInstantiator Instantiator(*this, FromVar->getDeclContext(),
MultiLevelList);
// TODO: Set LateAttrs and StartingScope ...
return cast_or_null<VarTemplateSpecializationDecl>(
Instantiator.VisitVarTemplateSpecializationDecl(
VarTemplate, FromVar, InsertPos, TemplateArgsInfo, Converted));
}
/// \brief Instantiates a variable template specialization by completing it
/// with appropriate type information and initializer.
VarTemplateSpecializationDecl *Sema::CompleteVarTemplateSpecializationDecl(
VarTemplateSpecializationDecl *VarSpec, VarDecl *PatternDecl,
const MultiLevelTemplateArgumentList &TemplateArgs) {
// Do substitution on the type of the declaration
TypeSourceInfo *DI =
SubstType(PatternDecl->getTypeSourceInfo(), TemplateArgs,
PatternDecl->getTypeSpecStartLoc(), PatternDecl->getDeclName());
if (!DI)
return 0;
// Update the type of this variable template specialization.
VarSpec->setType(DI->getType());
// Instantiate the initializer.
InstantiateVariableInitializer(VarSpec, PatternDecl, TemplateArgs);
return VarSpec;
}
/// BuildVariableInstantiation - Used after a new variable has been created.
/// Sets basic variable data and decides whether to postpone the
/// variable instantiation.
void Sema::BuildVariableInstantiation(
VarDecl *NewVar, VarDecl *OldVar,
const MultiLevelTemplateArgumentList &TemplateArgs,
LateInstantiatedAttrVec *LateAttrs, DeclContext *Owner,
LocalInstantiationScope *StartingScope,
bool InstantiatingVarTemplate) {
// If we are instantiating a local extern declaration, the
// instantiation belongs lexically to the containing function.
// 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 (OldVar->isLocalExternDecl()) {
NewVar->setLocalExternDecl();
NewVar->setLexicalDeclContext(Owner);
} else if (OldVar->isOutOfLine())
NewVar->setLexicalDeclContext(OldVar->getLexicalDeclContext());
NewVar->setTSCSpec(OldVar->getTSCSpec());
NewVar->setInitStyle(OldVar->getInitStyle());
NewVar->setCXXForRangeDecl(OldVar->isCXXForRangeDecl());
NewVar->setConstexpr(OldVar->isConstexpr());
NewVar->setInitCapture(OldVar->isInitCapture());
NewVar->setPreviousDeclInSameBlockScope(
OldVar->isPreviousDeclInSameBlockScope());
NewVar->setAccess(OldVar->getAccess());
if (!OldVar->isStaticDataMember()) {
if (OldVar->isUsed(false))
NewVar->setIsUsed();
NewVar->setReferenced(OldVar->isReferenced());
}
// See if the old variable had a type-specifier that defined an anonymous tag.
// If it did, mark the new variable as being the declarator for the new
// anonymous tag.
if (const TagType *OldTagType = OldVar->getType()->getAs<TagType>()) {
TagDecl *OldTag = OldTagType->getDecl();
if (OldTag->getDeclaratorForAnonDecl() == OldVar) {
TagDecl *NewTag = NewVar->getType()->castAs<TagType>()->getDecl();
assert(!NewTag->hasNameForLinkage() &&
!NewTag->hasDeclaratorForAnonDecl());
NewTag->setDeclaratorForAnonDecl(NewVar);
}
}
InstantiateAttrs(TemplateArgs, OldVar, NewVar, LateAttrs, StartingScope);
if (NewVar->hasAttrs())
CheckAlignasUnderalignment(NewVar);
LookupResult Previous(
*this, NewVar->getDeclName(), NewVar->getLocation(),
NewVar->isLocalExternDecl() ? Sema::LookupRedeclarationWithLinkage
: Sema::LookupOrdinaryName,
Sema::ForRedeclaration);
if (NewVar->isLocalExternDecl() && OldVar->getPreviousDecl()) {
// We have a previous declaration. Use that one, so we merge with the
// right type.
if (NamedDecl *NewPrev = FindInstantiatedDecl(
NewVar->getLocation(), OldVar->getPreviousDecl(), TemplateArgs))
Previous.addDecl(NewPrev);
} else if (!isa<VarTemplateSpecializationDecl>(NewVar) &&
OldVar->hasLinkage())
LookupQualifiedName(Previous, NewVar->getDeclContext(), false);
CheckVariableDeclaration(NewVar, Previous);
if (!InstantiatingVarTemplate) {
NewVar->getLexicalDeclContext()->addHiddenDecl(NewVar);
if (!NewVar->isLocalExternDecl() || !NewVar->getPreviousDecl())
NewVar->getDeclContext()->makeDeclVisibleInContext(NewVar);
}
if (!OldVar->isOutOfLine()) {
if (NewVar->getDeclContext()->isFunctionOrMethod())
CurrentInstantiationScope->InstantiatedLocal(OldVar, NewVar);
}
// Link instantiations of static data members back to the template from
// which they were instantiated.
if (NewVar->isStaticDataMember() && !InstantiatingVarTemplate)
NewVar->setInstantiationOfStaticDataMember(OldVar,
TSK_ImplicitInstantiation);
// Delay instantiation of the initializer for variable templates until a
// definition of the variable is needed.
if (!isa<VarTemplateSpecializationDecl>(NewVar) && !InstantiatingVarTemplate)
InstantiateVariableInitializer(NewVar, OldVar, TemplateArgs);
// Diagnose unused local variables with dependent types, where the diagnostic
// will have been deferred.
if (!NewVar->isInvalidDecl() &&
NewVar->getDeclContext()->isFunctionOrMethod() && !NewVar->isUsed() &&
OldVar->getType()->isDependentType())
DiagnoseUnusedDecl(NewVar);
}
/// \brief Instantiate the initializer of a variable.
void Sema::InstantiateVariableInitializer(
VarDecl *Var, VarDecl *OldVar,
const MultiLevelTemplateArgumentList &TemplateArgs) {
if (Var->getAnyInitializer())
// We already have an initializer in the class.
return;
if (OldVar->getInit()) {
if (Var->isStaticDataMember() && !OldVar->isOutOfLine())
PushExpressionEvaluationContext(Sema::ConstantEvaluated, OldVar);
else
PushExpressionEvaluationContext(Sema::PotentiallyEvaluated, OldVar);
// Instantiate the initializer.
ExprResult Init =
SubstInitializer(OldVar->getInit(), TemplateArgs,
OldVar->getInitStyle() == VarDecl::CallInit);
if (!Init.isInvalid()) {
bool TypeMayContainAuto = true;
if (Init.get()) {
bool DirectInit = OldVar->isDirectInit();
AddInitializerToDecl(Var, Init.take(), DirectInit, TypeMayContainAuto);
} else
ActOnUninitializedDecl(Var, TypeMayContainAuto);
} else {
// FIXME: Not too happy about invalidating the declaration
// because of a bogus initializer.
Var->setInvalidDecl();
}
PopExpressionEvaluationContext();
} else if ((!Var->isStaticDataMember() || Var->isOutOfLine()) &&
!Var->isCXXForRangeDecl())
ActOnUninitializedDecl(Var, false);
}
/// \brief Instantiate the definition of the given variable 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 Var the already-instantiated declaration of a static member
/// variable 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 an out-of-line definition of the member variable
/// is required. Complain if there is no such definition.
void Sema::InstantiateStaticDataMemberDefinition(
SourceLocation PointOfInstantiation,
VarDecl *Var,
bool Recursive,
bool DefinitionRequired) {
InstantiateVariableDefinition(PointOfInstantiation, Var, Recursive,
DefinitionRequired);
}
void Sema::InstantiateVariableDefinition(SourceLocation PointOfInstantiation,
VarDecl *Var, bool Recursive,
bool DefinitionRequired) {
if (Var->isInvalidDecl())
return;
VarTemplateSpecializationDecl *VarSpec =
dyn_cast<VarTemplateSpecializationDecl>(Var);
VarDecl *PatternDecl = 0, *Def = 0;
MultiLevelTemplateArgumentList TemplateArgs =
getTemplateInstantiationArgs(Var);
if (VarSpec) {
// If this is a variable template specialization, make sure that it is
// non-dependent, then find its instantiation pattern.
bool InstantiationDependent = false;
assert(!TemplateSpecializationType::anyDependentTemplateArguments(
VarSpec->getTemplateArgsInfo(), InstantiationDependent) &&
"Only instantiate variable template specializations that are "
"not type-dependent");
(void)InstantiationDependent;
// Find the variable initialization that we'll be substituting. If the
// pattern was instantiated from a member template, look back further to
// find the real pattern.
assert(VarSpec->getSpecializedTemplate() &&
"Specialization without specialized template?");
llvm::PointerUnion<VarTemplateDecl *,
VarTemplatePartialSpecializationDecl *> PatternPtr =
VarSpec->getSpecializedTemplateOrPartial();
if (PatternPtr.is<VarTemplatePartialSpecializationDecl *>()) {
VarTemplatePartialSpecializationDecl *Tmpl =
PatternPtr.get<VarTemplatePartialSpecializationDecl *>();
while (VarTemplatePartialSpecializationDecl *From =
Tmpl->getInstantiatedFromMember()) {
if (Tmpl->isMemberSpecialization())
break;
Tmpl = From;
}
PatternDecl = Tmpl;
} else {
VarTemplateDecl *Tmpl = PatternPtr.get<VarTemplateDecl *>();
while (VarTemplateDecl *From =
Tmpl->getInstantiatedFromMemberTemplate()) {
if (Tmpl->isMemberSpecialization())
break;
Tmpl = From;
}
PatternDecl = Tmpl->getTemplatedDecl();
}
// If this is a static data member template, there might be an
// uninstantiated initializer on the declaration. If so, instantiate
// it now.
if (PatternDecl->isStaticDataMember() &&
(PatternDecl = PatternDecl->getFirstDecl())->hasInit() &&
!Var->hasInit()) {
// FIXME: Factor out the duplicated instantiation context setup/tear down
// code here.
InstantiatingTemplate Inst(*this, PointOfInstantiation, Var);
if (Inst.isInvalid())
return;
// 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);
}
LocalInstantiationScope Local(*this);
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
ContextRAII PreviousContext(*this, Var->getDeclContext());
InstantiateVariableInitializer(Var, PatternDecl, TemplateArgs);
PreviousContext.pop();
// FIXME: Need to inform the ASTConsumer that we instantiated the
// initializer?
// This variable may have local implicit instantiations that need to be
// instantiated within this scope.
PerformPendingInstantiations(/*LocalOnly=*/true);
Local.Exit();
if (Recursive) {
// Define any newly required vtables.
DefineUsedVTables();
// Instantiate any pending implicit instantiations found during the
// instantiation of this template.
PerformPendingInstantiations();
// Restore the set of pending vtables.
assert(VTableUses.empty() &&
"VTableUses should be empty before it is discarded.");
VTableUses.swap(SavedVTableUses);
// Restore the set of pending implicit instantiations.
assert(PendingInstantiations.empty() &&
"PendingInstantiations should be empty before it is discarded.");
PendingInstantiations.swap(SavedPendingInstantiations);
}
}
// Find actual definition
Def = PatternDecl->getDefinition(getASTContext());
} else {
// If this is a static data member, find its out-of-line definition.
assert(Var->isStaticDataMember() && "not a static data member?");
PatternDecl = Var->getInstantiatedFromStaticDataMember();
assert(PatternDecl && "data member was not instantiated from a template?");
assert(PatternDecl->isStaticDataMember() && "not a static data member?");
Def = PatternDecl->getOutOfLineDefinition();
}
// If we don't have a definition of the variable template, we won't perform
// any instantiation. Rather, we rely on the user to instantiate this
// definition (or provide a specialization for it) in another translation
// unit.
if (!Def) {
if (DefinitionRequired) {
if (VarSpec)
Diag(PointOfInstantiation,
diag::err_explicit_instantiation_undefined_var_template) << Var;
else
Diag(PointOfInstantiation,
diag::err_explicit_instantiation_undefined_member)
<< 2 << Var->getDeclName() << Var->getDeclContext();
Diag(PatternDecl->getLocation(),
diag::note_explicit_instantiation_here);
if (VarSpec)
Var->setInvalidDecl();
} else if (Var->getTemplateSpecializationKind()
== TSK_ExplicitInstantiationDefinition) {
PendingInstantiations.push_back(
std::make_pair(Var, PointOfInstantiation));
}
return;
}
TemplateSpecializationKind TSK = Var->getTemplateSpecializationKind();
// Never instantiate an explicit specialization.
if (TSK == TSK_ExplicitSpecialization)
return;
// C++11 [temp.explicit]p10:
// Except for inline functions, [...] explicit instantiation declarations
// have the effect of suppressing the implicit instantiation of the entity
// to which they refer.
if (TSK == TSK_ExplicitInstantiationDeclaration)
return;
// Make sure to pass the instantiated variable to the consumer at the end.
struct PassToConsumerRAII {
ASTConsumer &Consumer;
VarDecl *Var;
PassToConsumerRAII(ASTConsumer &Consumer, VarDecl *Var)
: Consumer(Consumer), Var(Var) { }
~PassToConsumerRAII() {
Consumer.HandleCXXStaticMemberVarInstantiation(Var);
}
} PassToConsumerRAII(Consumer, Var);
// If we already have a definition, we're done.
if (VarDecl *Def = Var->getDefinition()) {
// We may be explicitly instantiating something we've already implicitly
// instantiated.
Def->setTemplateSpecializationKind(Var->getTemplateSpecializationKind(),
PointOfInstantiation);
return;
}
InstantiatingTemplate Inst(*this, PointOfInstantiation, Var);
if (Inst.isInvalid())
return;
// 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;
SavePendingLocalImplicitInstantiationsRAII
SavedPendingLocalImplicitInstantiations(*this);
if (Recursive) {
VTableUses.swap(SavedVTableUses);
PendingInstantiations.swap(SavedPendingInstantiations);
}
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
ContextRAII PreviousContext(*this, Var->getDeclContext());
LocalInstantiationScope Local(*this);
VarDecl *OldVar = Var;
if (!VarSpec)
Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(),
TemplateArgs));
else if (Var->isStaticDataMember() &&
Var->getLexicalDeclContext()->isRecord()) {
// We need to instantiate the definition of a static data member template,
// and all we have is the in-class declaration of it. Instantiate a separate
// declaration of the definition.
TemplateDeclInstantiator Instantiator(*this, Var->getDeclContext(),
TemplateArgs);
Var = cast_or_null<VarDecl>(Instantiator.VisitVarTemplateSpecializationDecl(
VarSpec->getSpecializedTemplate(), Def, 0,
VarSpec->getTemplateArgsInfo(), VarSpec->getTemplateArgs().asArray()));
if (Var) {
llvm::PointerUnion<VarTemplateDecl *,
VarTemplatePartialSpecializationDecl *> PatternPtr =
VarSpec->getSpecializedTemplateOrPartial();
if (VarTemplatePartialSpecializationDecl *Partial =
PatternPtr.dyn_cast<VarTemplatePartialSpecializationDecl *>())
cast<VarTemplateSpecializationDecl>(Var)->setInstantiationOf(
Partial, &VarSpec->getTemplateInstantiationArgs());
// Merge the definition with the declaration.
LookupResult R(*this, Var->getDeclName(), Var->getLocation(),
LookupOrdinaryName, ForRedeclaration);
R.addDecl(OldVar);
MergeVarDecl(Var, R);
// Attach the initializer.
InstantiateVariableInitializer(Var, Def, TemplateArgs);
}
} else
// Complete the existing variable's definition with an appropriately
// substituted type and initializer.
Var = CompleteVarTemplateSpecializationDecl(VarSpec, Def, TemplateArgs);
PreviousContext.pop();
if (Var) {
PassToConsumerRAII.Var = Var;
Var->setTemplateSpecializationKind(OldVar->getTemplateSpecializationKind(),
OldVar->getPointOfInstantiation());
}
// This variable may have local implicit instantiations that need to be
// instantiated within this scope.
PerformPendingInstantiations(/*LocalOnly=*/true);
Local.Exit();
if (Recursive) {
// Define any newly required vtables.
DefineUsedVTables();
// Instantiate any pending implicit instantiations found during the
// instantiation of this template.
PerformPendingInstantiations();
// Restore the set of pending vtables.
assert(VTableUses.empty() &&
"VTableUses should be empty before it is discarded.");
VTableUses.swap(SavedVTableUses);
// Restore the set of pending implicit instantiations.
assert(PendingInstantiations.empty() &&
"PendingInstantiations should be empty before it is discarded.");
PendingInstantiations.swap(SavedPendingInstantiations);
}
}
void
Sema::InstantiateMemInitializers(CXXConstructorDecl *New,
const CXXConstructorDecl *Tmpl,
const MultiLevelTemplateArgumentList &TemplateArgs) {
SmallVector<CXXCtorInitializer*, 4> NewInits;
bool AnyErrors = Tmpl->isInvalidDecl();
// Instantiate all the initializers.
for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(),
InitsEnd = Tmpl->init_end();
Inits != InitsEnd; ++Inits) {
CXXCtorInitializer *Init = *Inits;
// Only instantiate written initializers, let Sema re-construct implicit
// ones.
if (!Init->isWritten())
continue;
SourceLocation EllipsisLoc;
if (Init->isPackExpansion()) {
// This is a pack expansion. We should expand it now.
TypeLoc BaseTL = Init->getTypeSourceInfo()->getTypeLoc();
SmallVector<UnexpandedParameterPack, 4> Unexpanded;
collectUnexpandedParameterPacks(BaseTL, Unexpanded);
collectUnexpandedParameterPacks(Init->getInit(), Unexpanded);
bool ShouldExpand = false;
bool RetainExpansion = false;
Optional<unsigned> NumExpansions;
if (CheckParameterPacksForExpansion(Init->getEllipsisLoc(),
BaseTL.getSourceRange(),
Unexpanded,
TemplateArgs, ShouldExpand,
RetainExpansion,
NumExpansions)) {
AnyErrors = true;
New->setInvalidDecl();
continue;
}
assert(ShouldExpand && "Partial instantiation of base initializer?");
// Loop over all of the arguments in the argument pack(s),
for (unsigned I = 0; I != *NumExpansions; ++I) {
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, I);
// Instantiate the initializer.
ExprResult TempInit = SubstInitializer(Init->getInit(), TemplateArgs,
/*CXXDirectInit=*/true);
if (TempInit.isInvalid()) {
AnyErrors = true;
break;
}
// Instantiate the base type.
TypeSourceInfo *BaseTInfo = SubstType(Init->getTypeSourceInfo(),
TemplateArgs,
Init->getSourceLocation(),
New->getDeclName());
if (!BaseTInfo) {
AnyErrors = true;
break;
}
// Build the initializer.
MemInitResult NewInit = BuildBaseInitializer(BaseTInfo->getType(),
BaseTInfo, TempInit.take(),
New->getParent(),
SourceLocation());
if (NewInit.isInvalid()) {
AnyErrors = true;
break;
}
NewInits.push_back(NewInit.get());
}
continue;
}
// Instantiate the initializer.
ExprResult TempInit = SubstInitializer(Init->getInit(), TemplateArgs,
/*CXXDirectInit=*/true);
if (TempInit.isInvalid()) {
AnyErrors = true;
continue;
}
MemInitResult NewInit;
if (Init->isDelegatingInitializer() || Init->isBaseInitializer()) {
TypeSourceInfo *TInfo = SubstType(Init->getTypeSourceInfo(),
TemplateArgs,
Init->getSourceLocation(),
New->getDeclName());
if (!TInfo) {
AnyErrors = true;
New->setInvalidDecl();
continue;
}
if (Init->isBaseInitializer())
NewInit = BuildBaseInitializer(TInfo->getType(), TInfo, TempInit.take(),
New->getParent(), EllipsisLoc);
else
NewInit = BuildDelegatingInitializer(TInfo, TempInit.take(),
cast<CXXRecordDecl>(CurContext->getParent()));
} else if (Init->isMemberInitializer()) {
FieldDecl *Member = cast_or_null<FieldDecl>(FindInstantiatedDecl(
Init->getMemberLocation(),
Init->getMember(),
TemplateArgs));
if (!Member) {
AnyErrors = true;
New->setInvalidDecl();
continue;
}
NewInit = BuildMemberInitializer(Member, TempInit.take(),
Init->getSourceLocation());
} else if (Init->isIndirectMemberInitializer()) {
IndirectFieldDecl *IndirectMember =
cast_or_null<IndirectFieldDecl>(FindInstantiatedDecl(
Init->getMemberLocation(),
Init->getIndirectMember(), TemplateArgs));
if (!IndirectMember) {
AnyErrors = true;
New->setInvalidDecl();
continue;
}
NewInit = BuildMemberInitializer(IndirectMember, TempInit.take(),
Init->getSourceLocation());
}
if (NewInit.isInvalid()) {
AnyErrors = true;
New->setInvalidDecl();
} else {
NewInits.push_back(NewInit.get());
}
}
// Assign all the initializers to the new constructor.
ActOnMemInitializers(New,
/*FIXME: ColonLoc */
SourceLocation(),
NewInits,
AnyErrors);
}
// TODO: this could be templated if the various decl types used the
// same method name.
static bool isInstantiationOf(ClassTemplateDecl *Pattern,
ClassTemplateDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberTemplate();
} while (Instance);
return false;
}
static bool isInstantiationOf(FunctionTemplateDecl *Pattern,
FunctionTemplateDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberTemplate();
} while (Instance);
return false;
}
static bool
isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern,
ClassTemplatePartialSpecializationDecl *Instance) {
Pattern
= cast<ClassTemplatePartialSpecializationDecl>(Pattern->getCanonicalDecl());
do {
Instance = cast<ClassTemplatePartialSpecializationDecl>(
Instance->getCanonicalDecl());
if (Pattern == Instance)
return true;
Instance = Instance->getInstantiatedFromMember();
} while (Instance);
return false;
}
static bool isInstantiationOf(CXXRecordDecl *Pattern,
CXXRecordDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberClass();
} while (Instance);
return false;
}
static bool isInstantiationOf(FunctionDecl *Pattern,
FunctionDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberFunction();
} while (Instance);
return false;
}
static bool isInstantiationOf(EnumDecl *Pattern,
EnumDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberEnum();
} while (Instance);
return false;
}
static bool isInstantiationOf(UsingShadowDecl *Pattern,
UsingShadowDecl *Instance,
ASTContext &C) {
return C.getInstantiatedFromUsingShadowDecl(Instance) == Pattern;
}
static bool isInstantiationOf(UsingDecl *Pattern,
UsingDecl *Instance,
ASTContext &C) {
return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
}
static bool isInstantiationOf(UnresolvedUsingValueDecl *Pattern,
UsingDecl *Instance,
ASTContext &C) {
return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
}
static bool isInstantiationOf(UnresolvedUsingTypenameDecl *Pattern,
UsingDecl *Instance,
ASTContext &C) {
return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
}
static bool isInstantiationOfStaticDataMember(VarDecl *Pattern,
VarDecl *Instance) {
assert(Instance->isStaticDataMember());
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromStaticDataMember();
} while (Instance);
return false;
}
// Other is the prospective instantiation
// D is the prospective pattern
static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) {
if (D->getKind() != Other->getKind()) {
if (UnresolvedUsingTypenameDecl *UUD
= dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) {
return isInstantiationOf(UUD, UD, Ctx);
}
}
if (UnresolvedUsingValueDecl *UUD
= dyn_cast<UnresolvedUsingValueDecl>(D)) {
if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) {
return isInstantiationOf(UUD, UD, Ctx);
}
}
return false;
}
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other))
return isInstantiationOf(cast<CXXRecordDecl>(D), Record);
if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other))
return isInstantiationOf(cast<FunctionDecl>(D), Function);
if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other))
return isInstantiationOf(cast<EnumDecl>(D), Enum);
if (VarDecl *Var = dyn_cast<VarDecl>(Other))
if (Var->isStaticDataMember())
return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var);
if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other))
return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp);
if (FunctionTemplateDecl *Temp = dyn_cast<FunctionTemplateDecl>(Other))
return isInstantiationOf(cast<FunctionTemplateDecl>(D), Temp);
if (ClassTemplatePartialSpecializationDecl *PartialSpec
= dyn_cast<ClassTemplatePartialSpecializationDecl>(Other))
return isInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(D),
PartialSpec);
if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) {
if (!Field->getDeclName()) {
// This is an unnamed field.
return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) ==
cast<FieldDecl>(D);
}
}
if (UsingDecl *Using = dyn_cast<UsingDecl>(Other))
return isInstantiationOf(cast<UsingDecl>(D), Using, Ctx);
if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(Other))
return isInstantiationOf(cast<UsingShadowDecl>(D), Shadow, Ctx);
return D->getDeclName() && isa<NamedDecl>(Other) &&
D->getDeclName() == cast<NamedDecl>(Other)->getDeclName();
}
template<typename ForwardIterator>
static NamedDecl *findInstantiationOf(ASTContext &Ctx,
NamedDecl *D,
ForwardIterator first,
ForwardIterator last) {
for (; first != last; ++first)
if (isInstantiationOf(Ctx, D, *first))
return cast<NamedDecl>(*first);
return 0;
}
/// \brief Finds the instantiation of the given declaration context
/// within the current instantiation.
///
/// \returns NULL if there was an error
DeclContext *Sema::FindInstantiatedContext(SourceLocation Loc, DeclContext* DC,
const MultiLevelTemplateArgumentList &TemplateArgs) {
if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) {
Decl* ID = FindInstantiatedDecl(Loc, D, TemplateArgs);
return cast_or_null<DeclContext>(ID);
} else return DC;
}
/// \brief Find the instantiation of the given declaration within the
/// current instantiation.
///
/// This routine is intended to be used when \p D is a declaration
/// referenced from within a template, that needs to mapped into the
/// corresponding declaration within an instantiation. For example,
/// given:
///
/// \code
/// template<typename T>
/// struct X {
/// enum Kind {
/// KnownValue = sizeof(T)
/// };
///
/// bool getKind() const { return KnownValue; }
/// };
///
/// template struct X<int>;
/// \endcode
///
/// In the instantiation of <tt>X<int>::getKind()</tt>, we need to map the
/// \p EnumConstantDecl for \p KnownValue (which refers to
/// <tt>X<T>::<Kind>::KnownValue</tt>) to its instantiation
/// (<tt>X<int>::<Kind>::KnownValue</tt>). \p FindInstantiatedDecl performs
/// this mapping from within the instantiation of <tt>X<int></tt>.
NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
const MultiLevelTemplateArgumentList &TemplateArgs) {
DeclContext *ParentDC = D->getDeclContext();
// FIXME: Parmeters of pointer to functions (y below) that are themselves
// parameters (p below) can have their ParentDC set to the translation-unit
// - thus we can not consistently check if the ParentDC of such a parameter
// is Dependent or/and a FunctionOrMethod.
// For e.g. this code, during Template argument deduction tries to
// find an instantiated decl for (T y) when the ParentDC for y is
// the translation unit.
// e.g. template <class T> void Foo(auto (*p)(T y) -> decltype(y())) {}
// float baz(float(*)()) { return 0.0; }
// Foo(baz);
// The better fix here is perhaps to ensure that a ParmVarDecl, by the time
// it gets here, always has a FunctionOrMethod as its ParentDC??
// For now:
// - as long as we have a ParmVarDecl whose parent is non-dependent and
// whose type is not instantiation dependent, do nothing to the decl
// - otherwise find its instantiated decl.
if (isa<ParmVarDecl>(D) && !ParentDC->isDependentContext() &&
!cast<ParmVarDecl>(D)->getType()->isInstantiationDependentType())
return D;
if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) ||
isa<TemplateTypeParmDecl>(D) || isa<TemplateTemplateParmDecl>(D) ||
(ParentDC->isFunctionOrMethod() && ParentDC->isDependentContext()) ||
(isa<CXXRecordDecl>(D) && cast<CXXRecordDecl>(D)->isLambda())) {
// D is a local of some kind. Look into the map of local
// declarations to their instantiations.
typedef LocalInstantiationScope::DeclArgumentPack DeclArgumentPack;
llvm::PointerUnion<Decl *, DeclArgumentPack *> *Found
= CurrentInstantiationScope->findInstantiationOf(D);
if (Found) {
if (Decl *FD = Found->dyn_cast<Decl *>())
return cast<NamedDecl>(FD);
int PackIdx = ArgumentPackSubstitutionIndex;
assert(PackIdx != -1 && "found declaration pack but not pack expanding");
return cast<NamedDecl>((*Found->get<DeclArgumentPack *>())[PackIdx]);
}
// If we're performing a partial substitution during template argument
// deduction, we may not have values for template parameters yet. They
// just map to themselves.
if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) ||
isa<TemplateTemplateParmDecl>(D))
return D;
if (D->isInvalidDecl())
return 0;
// If we didn't find the decl, then we must have a label decl that hasn't
// been found yet. Lazily instantiate it and return it now.
assert(isa<LabelDecl>(D));
Decl *Inst = SubstDecl(D, CurContext, TemplateArgs);
assert(Inst && "Failed to instantiate label??");
CurrentInstantiationScope->InstantiatedLocal(D, Inst);
return cast<LabelDecl>(Inst);
}
// For variable template specializations, update those that are still
// type-dependent.
if (VarTemplateSpecializationDecl *VarSpec =
dyn_cast<VarTemplateSpecializationDecl>(D)) {
bool InstantiationDependent = false;
const TemplateArgumentListInfo &VarTemplateArgs =
VarSpec->getTemplateArgsInfo();
if (TemplateSpecializationType::anyDependentTemplateArguments(
VarTemplateArgs, InstantiationDependent))
D = cast<NamedDecl>(
SubstDecl(D, VarSpec->getDeclContext(), TemplateArgs));
return D;
}
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
if (!Record->isDependentContext())
return D;
// Determine whether this record is the "templated" declaration describing
// a class template or class template partial specialization.
ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate();
if (ClassTemplate)
ClassTemplate = ClassTemplate->getCanonicalDecl();
else if (ClassTemplatePartialSpecializationDecl *PartialSpec
= dyn_cast<ClassTemplatePartialSpecializationDecl>(Record))
ClassTemplate = PartialSpec->getSpecializedTemplate()->getCanonicalDecl();
// Walk the current context to find either the record or an instantiation of
// it.
DeclContext *DC = CurContext;
while (!DC->isFileContext()) {
// If we're performing substitution while we're inside the template
// definition, we'll find our own context. We're done.
if (DC->Equals(Record))
return Record;
if (CXXRecordDecl *InstRecord = dyn_cast<CXXRecordDecl>(DC)) {
// Check whether we're in the process of instantiating a class template
// specialization of the template we're mapping.
if (ClassTemplateSpecializationDecl *InstSpec
= dyn_cast<ClassTemplateSpecializationDecl>(InstRecord)){
ClassTemplateDecl *SpecTemplate = InstSpec->getSpecializedTemplate();
if (ClassTemplate && isInstantiationOf(ClassTemplate, SpecTemplate))
return InstRecord;
}
// Check whether we're in the process of instantiating a member class.
if (isInstantiationOf(Record, InstRecord))
return InstRecord;
}
// Move to the outer template scope.
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DC)) {
if (FD->getFriendObjectKind() && FD->getDeclContext()->isFileContext()){
DC = FD->getLexicalDeclContext();
continue;
}
}
DC = DC->getParent();
}
// Fall through to deal with other dependent record types (e.g.,
// anonymous unions in class templates).
}
if (!ParentDC->isDependentContext())
return D;
ParentDC = FindInstantiatedContext(Loc, ParentDC, TemplateArgs);
if (!ParentDC)
return 0;
if (ParentDC != D->getDeclContext()) {
// We performed some kind of instantiation in the parent context,
// so now we need to look into the instantiated parent context to
// find the instantiation of the declaration D.
// If our context used to be dependent, we may need to instantiate
// it before performing lookup into that context.
bool IsBeingInstantiated = false;
if (CXXRecordDecl *Spec = dyn_cast<CXXRecordDecl>(ParentDC)) {
if (!Spec->isDependentContext()) {
QualType T = Context.getTypeDeclType(Spec);
const RecordType *Tag = T->getAs<RecordType>();
assert(Tag && "type of non-dependent record is not a RecordType");
if (Tag->isBeingDefined())
IsBeingInstantiated = true;
if (!Tag->isBeingDefined() &&
RequireCompleteType(Loc, T, diag::err_incomplete_type))
return 0;
ParentDC = Tag->getDecl();
}
}
NamedDecl *Result = 0;
if (D->getDeclName()) {
DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName());
Result = findInstantiationOf(Context, D, Found.begin(), Found.end());
} else {
// Since we don't have a name for the entity we're looking for,
// our only option is to walk through all of the declarations to
// find that name. This will occur in a few cases:
//
// - anonymous struct/union within a template
// - unnamed class/struct/union/enum within a template
//
// FIXME: Find a better way to find these instantiations!
Result = findInstantiationOf(Context, D,
ParentDC->decls_begin(),
ParentDC->decls_end());
}
if (!Result) {
if (isa<UsingShadowDecl>(D)) {
// UsingShadowDecls can instantiate to nothing because of using hiding.
} else if (Diags.hasErrorOccurred()) {
// We've already complained about something, so most likely this
// declaration failed to instantiate. There's no point in complaining
// further, since this is normal in invalid code.
} else if (IsBeingInstantiated) {
// The class in which this member exists is currently being
// instantiated, and we haven't gotten around to instantiating this
// member yet. This can happen when the code uses forward declarations
// of member classes, and introduces ordering dependencies via
// template instantiation.
Diag(Loc, diag::err_member_not_yet_instantiated)
<< D->getDeclName()
<< Context.getTypeDeclType(cast<CXXRecordDecl>(ParentDC));
Diag(D->getLocation(), diag::note_non_instantiated_member_here);
} else if (EnumConstantDecl *ED = dyn_cast<EnumConstantDecl>(D)) {
// This enumeration constant was found when the template was defined,
// but can't be found in the instantiation. This can happen if an
// unscoped enumeration member is explicitly specialized.
EnumDecl *Enum = cast<EnumDecl>(ED->getLexicalDeclContext());
EnumDecl *Spec = cast<EnumDecl>(FindInstantiatedDecl(Loc, Enum,
TemplateArgs));
assert(Spec->getTemplateSpecializationKind() ==
TSK_ExplicitSpecialization);
Diag(Loc, diag::err_enumerator_does_not_exist)
<< D->getDeclName()
<< Context.getTypeDeclType(cast<TypeDecl>(Spec->getDeclContext()));
Diag(Spec->getLocation(), diag::note_enum_specialized_here)
<< Context.getTypeDeclType(Spec);
} else {
// We should have found something, but didn't.
llvm_unreachable("Unable to find instantiation of declaration!");
}
}
D = Result;
}
return D;
}
/// \brief Performs template instantiation for all implicit template
/// instantiations we have seen until this point.
void Sema::PerformPendingInstantiations(bool LocalOnly) {
// Load pending instantiations from the external source.
if (!LocalOnly && ExternalSource) {
SmallVector<PendingImplicitInstantiation, 4> Pending;
ExternalSource->ReadPendingInstantiations(Pending);
PendingInstantiations.insert(PendingInstantiations.begin(),
Pending.begin(), Pending.end());
}
while (!PendingLocalImplicitInstantiations.empty() ||
(!LocalOnly && !PendingInstantiations.empty())) {
PendingImplicitInstantiation Inst;
if (PendingLocalImplicitInstantiations.empty()) {
Inst = PendingInstantiations.front();
PendingInstantiations.pop_front();
} else {
Inst = PendingLocalImplicitInstantiations.front();
PendingLocalImplicitInstantiations.pop_front();
}
// Instantiate function definitions
if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) {
PrettyDeclStackTraceEntry CrashInfo(*this, Function, SourceLocation(),
"instantiating function definition");
bool DefinitionRequired = Function->getTemplateSpecializationKind() ==
TSK_ExplicitInstantiationDefinition;
InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true,
DefinitionRequired);
continue;
}
// Instantiate variable definitions
VarDecl *Var = cast<VarDecl>(Inst.first);
assert((Var->isStaticDataMember() ||
isa<VarTemplateSpecializationDecl>(Var)) &&
"Not a static data member, nor a variable template"
" specialization?");
// Don't try to instantiate declarations if the most recent redeclaration
// is invalid.
if (Var->getMostRecentDecl()->isInvalidDecl())
continue;
// Check if the most recent declaration has changed the specialization kind
// and removed the need for implicit instantiation.
switch (Var->getMostRecentDecl()->getTemplateSpecializationKind()) {
case TSK_Undeclared:
llvm_unreachable("Cannot instantitiate an undeclared specialization.");
case TSK_ExplicitInstantiationDeclaration:
case TSK_ExplicitSpecialization:
continue; // No longer need to instantiate this type.
case TSK_ExplicitInstantiationDefinition:
// We only need an instantiation if the pending instantiation *is* the
// explicit instantiation.
if (Var != Var->getMostRecentDecl()) continue;
case TSK_ImplicitInstantiation:
break;
}
PrettyDeclStackTraceEntry CrashInfo(*this, Var, SourceLocation(),
"instantiating variable definition");
bool DefinitionRequired = Var->getTemplateSpecializationKind() ==
TSK_ExplicitInstantiationDefinition;
// Instantiate static data member definitions or variable template
// specializations.
InstantiateVariableDefinition(/*FIXME:*/ Inst.second, Var, true,
DefinitionRequired);
}
}
void Sema::PerformDependentDiagnostics(const DeclContext *Pattern,
const MultiLevelTemplateArgumentList &TemplateArgs) {
for (DeclContext::ddiag_iterator I = Pattern->ddiag_begin(),
E = Pattern->ddiag_end(); I != E; ++I) {
DependentDiagnostic *DD = *I;
switch (DD->getKind()) {
case DependentDiagnostic::Access:
HandleDependentAccessCheck(*DD, TemplateArgs);
break;
}
}
}
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