diff options
Diffstat (limited to 'clang/lib/Sema/SemaTemplateInstantiateDecl.cpp')
| -rw-r--r-- | clang/lib/Sema/SemaTemplateInstantiateDecl.cpp | 3502 |
1 files changed, 3502 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp new file mode 100644 index 0000000..c7bd99c --- /dev/null +++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp @@ -0,0 +1,3502 @@ +//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/ +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +//===----------------------------------------------------------------------===/ +// +// This file implements C++ template instantiation for declarations. +// +//===----------------------------------------------------------------------===/ +#include "clang/Sema/SemaInternal.h" +#include "clang/Sema/Lookup.h" +#include "clang/Sema/PrettyDeclStackTrace.h" +#include "clang/Sema/Template.h" +#include "clang/AST/ASTConsumer.h" +#include "clang/AST/ASTContext.h" +#include "clang/AST/DeclTemplate.h" +#include "clang/AST/DeclVisitor.h" +#include "clang/AST/DependentDiagnostic.h" +#include "clang/AST/Expr.h" +#include "clang/AST/ExprCXX.h" +#include "clang/AST/TypeLoc.h" +#include "clang/Lex/Preprocessor.h" + +using namespace clang; + +bool TemplateDeclInstantiator::SubstQualifier(const DeclaratorDecl *OldDecl, + DeclaratorDecl *NewDecl) { + if (!OldDecl->getQualifierLoc()) + return false; + + NestedNameSpecifierLoc NewQualifierLoc + = SemaRef.SubstNestedNameSpecifierLoc(OldDecl->getQualifierLoc(), + TemplateArgs); + + if (!NewQualifierLoc) + return true; + + NewDecl->setQualifierInfo(NewQualifierLoc); + return false; +} + +bool TemplateDeclInstantiator::SubstQualifier(const TagDecl *OldDecl, + TagDecl *NewDecl) { + if (!OldDecl->getQualifierLoc()) + return false; + + NestedNameSpecifierLoc NewQualifierLoc + = SemaRef.SubstNestedNameSpecifierLoc(OldDecl->getQualifierLoc(), + TemplateArgs); + + if (!NewQualifierLoc) + return true; + + NewDecl->setQualifierInfo(NewQualifierLoc); + return false; +} + +// Include attribute instantiation code. +#include "clang/Sema/AttrTemplateInstantiate.inc" + +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. + if (const AlignedAttr *Aligned = dyn_cast<AlignedAttr>(TmplAttr)) { + if (Aligned->isAlignmentDependent()) { + if (Aligned->isAlignmentExpr()) { + // The alignment expression is a constant expression. + EnterExpressionEvaluationContext Unevaluated(*this, + Sema::ConstantEvaluated); + + ExprResult Result = SubstExpr(Aligned->getAlignmentExpr(), + TemplateArgs); + if (!Result.isInvalid()) + AddAlignedAttr(Aligned->getLocation(), New, Result.takeAs<Expr>()); + } else { + TypeSourceInfo *Result = SubstType(Aligned->getAlignmentType(), + TemplateArgs, + Aligned->getLocation(), + DeclarationName()); + if (Result) + AddAlignedAttr(Aligned->getLocation(), New, Result); + } + continue; + } + } + + 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 { + Attr *NewAttr = sema::instantiateTemplateAttribute(TmplAttr, Context, + *this, TemplateArgs); + New->addAttr(NewAttr); + } + } +} + +Decl * +TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) { + llvm_unreachable("Translation units cannot be instantiated"); +} + +Decl * +TemplateDeclInstantiator::VisitLabelDecl(LabelDecl *D) { + LabelDecl *Inst = LabelDecl::Create(SemaRef.Context, Owner, D->getLocation(), + D->getIdentifier()); + Owner->addDecl(Inst); + return Inst; +} + +Decl * +TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) { + llvm_unreachable("Namespaces cannot be instantiated"); +} + +Decl * +TemplateDeclInstantiator::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) { + NamespaceAliasDecl *Inst + = NamespaceAliasDecl::Create(SemaRef.Context, Owner, + D->getNamespaceLoc(), + D->getAliasLoc(), + D->getIdentifier(), + D->getQualifierLoc(), + D->getTargetNameLoc(), + D->getNamespace()); + Owner->addDecl(Inst); + return Inst; +} + +Decl *TemplateDeclInstantiator::InstantiateTypedefNameDecl(TypedefNameDecl *D, + bool IsTypeAlias) { + bool Invalid = false; + TypeSourceInfo *DI = D->getTypeSourceInfo(); + if (DI->getType()->isInstantiationDependentType() || + DI->getType()->isVariablyModifiedType()) { + DI = SemaRef.SubstType(DI, TemplateArgs, + D->getLocation(), D->getDeclName()); + if (!DI) { + Invalid = true; + DI = SemaRef.Context.getTrivialTypeSourceInfo(SemaRef.Context.IntTy); + } + } else { + SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType()); + } + + // Create the new typedef + TypedefNameDecl *Typedef; + if (IsTypeAlias) + Typedef = TypeAliasDecl::Create(SemaRef.Context, Owner, D->getLocStart(), + D->getLocation(), D->getIdentifier(), DI); + else + Typedef = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocStart(), + D->getLocation(), D->getIdentifier(), DI); + if (Invalid) + Typedef->setInvalidDecl(); + + // If the old typedef was the name for linkage purposes of an anonymous + // tag decl, re-establish that relationship for the new typedef. + if (const TagType *oldTagType = D->getUnderlyingType()->getAs<TagType>()) { + TagDecl *oldTag = oldTagType->getDecl(); + if (oldTag->getTypedefNameForAnonDecl() == D) { + TagDecl *newTag = DI->getType()->castAs<TagType>()->getDecl(); + assert(!newTag->getIdentifier() && !newTag->getTypedefNameForAnonDecl()); + newTag->setTypedefNameForAnonDecl(Typedef); + } + } + + if (TypedefNameDecl *Prev = D->getPreviousDecl()) { + NamedDecl *InstPrev = SemaRef.FindInstantiatedDecl(D->getLocation(), Prev, + TemplateArgs); + if (!InstPrev) + return 0; + + TypedefNameDecl *InstPrevTypedef = cast<TypedefNameDecl>(InstPrev); + + // If the typedef types are not identical, reject them. + SemaRef.isIncompatibleTypedef(InstPrevTypedef, Typedef); + + Typedef->setPreviousDeclaration(InstPrevTypedef); + } + + SemaRef.InstantiateAttrs(TemplateArgs, D, Typedef); + + Typedef->setAccess(D->getAccess()); + + return Typedef; +} + +Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) { + Decl *Typedef = InstantiateTypedefNameDecl(D, /*IsTypeAlias=*/false); + Owner->addDecl(Typedef); + return Typedef; +} + +Decl *TemplateDeclInstantiator::VisitTypeAliasDecl(TypeAliasDecl *D) { + Decl *Typedef = InstantiateTypedefNameDecl(D, /*IsTypeAlias=*/true); + Owner->addDecl(Typedef); + return Typedef; +} + +Decl * +TemplateDeclInstantiator::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) { + // Create a local instantiation scope for this type alias template, which + // will contain the instantiations of the template parameters. + LocalInstantiationScope Scope(SemaRef); + + TemplateParameterList *TempParams = D->getTemplateParameters(); + TemplateParameterList *InstParams = SubstTemplateParams(TempParams); + if (!InstParams) + return 0; + + TypeAliasDecl *Pattern = D->getTemplatedDecl(); + + TypeAliasTemplateDecl *PrevAliasTemplate = 0; + if (Pattern->getPreviousDecl()) { + DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName()); + if (Found.first != Found.second) { + PrevAliasTemplate = dyn_cast<TypeAliasTemplateDecl>(*Found.first); + } + } + + TypeAliasDecl *AliasInst = cast_or_null<TypeAliasDecl>( + InstantiateTypedefNameDecl(Pattern, /*IsTypeAlias=*/true)); + if (!AliasInst) + return 0; + + TypeAliasTemplateDecl *Inst + = TypeAliasTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(), + D->getDeclName(), InstParams, AliasInst); + if (PrevAliasTemplate) + Inst->setPreviousDeclaration(PrevAliasTemplate); + + Inst->setAccess(D->getAccess()); + + if (!PrevAliasTemplate) + Inst->setInstantiatedFromMemberTemplate(D); + + Owner->addDecl(Inst); + + return Inst; +} + +Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { + // If this is the variable for an anonymous struct or union, + // instantiate the anonymous struct/union type first. + if (const RecordType *RecordTy = D->getType()->getAs<RecordType>()) + if (RecordTy->getDecl()->isAnonymousStructOrUnion()) + if (!VisitCXXRecordDecl(cast<CXXRecordDecl>(RecordTy->getDecl()))) + return 0; + + // Do substitution on the type of the declaration + TypeSourceInfo *DI = SemaRef.SubstType(D->getTypeSourceInfo(), + TemplateArgs, + D->getTypeSpecStartLoc(), + D->getDeclName()); + if (!DI) + return 0; + + if (DI->getType()->isFunctionType()) { + SemaRef.Diag(D->getLocation(), diag::err_variable_instantiates_to_function) + << D->isStaticDataMember() << DI->getType(); + return 0; + } + + // Build the instantiated declaration + VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner, + D->getInnerLocStart(), + D->getLocation(), D->getIdentifier(), + DI->getType(), DI, + D->getStorageClass(), + D->getStorageClassAsWritten()); + Var->setThreadSpecified(D->isThreadSpecified()); + Var->setInitStyle(D->getInitStyle()); + Var->setCXXForRangeDecl(D->isCXXForRangeDecl()); + Var->setConstexpr(D->isConstexpr()); + + // Substitute the nested name specifier, if any. + if (SubstQualifier(D, Var)) + return 0; + + // If we are instantiating a static data member defined + // out-of-line, the instantiation will have the same lexical + // context (which will be a namespace scope) as the template. + if (D->isOutOfLine()) + Var->setLexicalDeclContext(D->getLexicalDeclContext()); + + Var->setAccess(D->getAccess()); + + if (!D->isStaticDataMember()) { + Var->setUsed(D->isUsed(false)); + Var->setReferenced(D->isReferenced()); + } + + // FIXME: In theory, we could have a previous declaration for variables that + // are not static data members. + // FIXME: having to fake up a LookupResult is dumb. + LookupResult Previous(SemaRef, Var->getDeclName(), Var->getLocation(), + Sema::LookupOrdinaryName, Sema::ForRedeclaration); + if (D->isStaticDataMember()) + SemaRef.LookupQualifiedName(Previous, Owner, false); + + // In ARC, infer 'retaining' for variables of retainable type. + if (SemaRef.getLangOpts().ObjCAutoRefCount && + SemaRef.inferObjCARCLifetime(Var)) + Var->setInvalidDecl(); + + SemaRef.CheckVariableDeclaration(Var, Previous); + + if (D->isOutOfLine()) { + D->getLexicalDeclContext()->addDecl(Var); + Owner->makeDeclVisibleInContext(Var); + } else { + Owner->addDecl(Var); + if (Owner->isFunctionOrMethod()) + SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Var); + } + SemaRef.InstantiateAttrs(TemplateArgs, D, Var, LateAttrs, StartingScope); + + // Link instantiations of static data members back to the template from + // which they were instantiated. + if (Var->isStaticDataMember()) + SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D, + TSK_ImplicitInstantiation); + + if (Var->getAnyInitializer()) { + // We already have an initializer in the class. + } else if (D->getInit()) { + if (Var->isStaticDataMember() && !D->isOutOfLine()) + SemaRef.PushExpressionEvaluationContext(Sema::ConstantEvaluated); + else + SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); + + // Instantiate the initializer. + ExprResult Init = SemaRef.SubstInitializer(D->getInit(), TemplateArgs, + D->getInitStyle() == VarDecl::CallInit); + if (!Init.isInvalid()) { + bool TypeMayContainAuto = true; + if (Init.get()) { + bool DirectInit = D->isDirectInit(); + SemaRef.AddInitializerToDecl(Var, Init.take(), DirectInit, + TypeMayContainAuto); + } else + SemaRef.ActOnUninitializedDecl(Var, TypeMayContainAuto); + } else { + // FIXME: Not too happy about invalidating the declaration + // because of a bogus initializer. + Var->setInvalidDecl(); + } + + SemaRef.PopExpressionEvaluationContext(); + } else if ((!Var->isStaticDataMember() || Var->isOutOfLine()) && + !Var->isCXXForRangeDecl()) + SemaRef.ActOnUninitializedDecl(Var, false); + + // Diagnose unused local variables with dependent types, where the diagnostic + // will have been deferred. + if (!Var->isInvalidDecl() && Owner->isFunctionOrMethod() && !Var->isUsed() && + D->getType()->isDependentType()) + SemaRef.DiagnoseUnusedDecl(Var); + + return Var; +} + +Decl *TemplateDeclInstantiator::VisitAccessSpecDecl(AccessSpecDecl *D) { + AccessSpecDecl* AD + = AccessSpecDecl::Create(SemaRef.Context, D->getAccess(), Owner, + D->getAccessSpecifierLoc(), D->getColonLoc()); + Owner->addHiddenDecl(AD); + return AD; +} + +Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) { + bool Invalid = false; + TypeSourceInfo *DI = D->getTypeSourceInfo(); + if (DI->getType()->isInstantiationDependentType() || + DI->getType()->isVariablyModifiedType()) { + DI = SemaRef.SubstType(DI, TemplateArgs, + D->getLocation(), D->getDeclName()); + if (!DI) { + DI = D->getTypeSourceInfo(); + Invalid = true; + } else if (DI->getType()->isFunctionType()) { + // C++ [temp.arg.type]p3: + // If a declaration acquires a function type through a type + // dependent on a template-parameter and this causes a + // declaration that does not use the syntactic form of a + // function declarator to have function type, the program is + // ill-formed. + SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function) + << DI->getType(); + Invalid = true; + } + } else { + SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType()); + } + + Expr *BitWidth = D->getBitWidth(); + if (Invalid) + BitWidth = 0; + else if (BitWidth) { + // The bit-width expression is a constant expression. + EnterExpressionEvaluationContext Unevaluated(SemaRef, + Sema::ConstantEvaluated); + + ExprResult InstantiatedBitWidth + = SemaRef.SubstExpr(BitWidth, TemplateArgs); + if (InstantiatedBitWidth.isInvalid()) { + Invalid = true; + BitWidth = 0; + } else + BitWidth = InstantiatedBitWidth.takeAs<Expr>(); + } + + FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), + DI->getType(), DI, + cast<RecordDecl>(Owner), + D->getLocation(), + D->isMutable(), + BitWidth, + D->hasInClassInitializer(), + D->getTypeSpecStartLoc(), + D->getAccess(), + 0); + if (!Field) { + cast<Decl>(Owner)->setInvalidDecl(); + return 0; + } + + SemaRef.InstantiateAttrs(TemplateArgs, D, Field, LateAttrs, StartingScope); + + if (Invalid) + Field->setInvalidDecl(); + + if (!Field->getDeclName()) { + // Keep track of where this decl came from. + SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D); + } + if (CXXRecordDecl *Parent= dyn_cast<CXXRecordDecl>(Field->getDeclContext())) { + if (Parent->isAnonymousStructOrUnion() && + Parent->getRedeclContext()->isFunctionOrMethod()) + SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Field); + } + + Field->setImplicit(D->isImplicit()); + Field->setAccess(D->getAccess()); + Owner->addDecl(Field); + + return Field; +} + +Decl *TemplateDeclInstantiator::VisitIndirectFieldDecl(IndirectFieldDecl *D) { + NamedDecl **NamedChain = + new (SemaRef.Context)NamedDecl*[D->getChainingSize()]; + + int i = 0; + for (IndirectFieldDecl::chain_iterator PI = + D->chain_begin(), PE = D->chain_end(); + PI != PE; ++PI) { + NamedDecl *Next = SemaRef.FindInstantiatedDecl(D->getLocation(), *PI, + TemplateArgs); + if (!Next) + return 0; + + NamedChain[i++] = Next; + } + + QualType T = cast<FieldDecl>(NamedChain[i-1])->getType(); + IndirectFieldDecl* IndirectField + = IndirectFieldDecl::Create(SemaRef.Context, Owner, D->getLocation(), + D->getIdentifier(), T, + NamedChain, D->getChainingSize()); + + + IndirectField->setImplicit(D->isImplicit()); + IndirectField->setAccess(D->getAccess()); + Owner->addDecl(IndirectField); + return IndirectField; +} + +Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) { + // Handle friend type expressions by simply substituting template + // parameters into the pattern type and checking the result. + if (TypeSourceInfo *Ty = D->getFriendType()) { + TypeSourceInfo *InstTy; + // If this is an unsupported friend, don't bother substituting template + // arguments into it. The actual type referred to won't be used by any + // parts of Clang, and may not be valid for instantiating. Just use the + // same info for the instantiated friend. + if (D->isUnsupportedFriend()) { + InstTy = Ty; + } else { + InstTy = SemaRef.SubstType(Ty, TemplateArgs, + D->getLocation(), DeclarationName()); + } + if (!InstTy) + return 0; + + FriendDecl *FD = SemaRef.CheckFriendTypeDecl(D->getLocation(), + D->getFriendLoc(), InstTy); + if (!FD) + return 0; + + FD->setAccess(AS_public); + FD->setUnsupportedFriend(D->isUnsupportedFriend()); + Owner->addDecl(FD); + return FD; + } + + NamedDecl *ND = D->getFriendDecl(); + assert(ND && "friend decl must be a decl or a type!"); + + // All of the Visit implementations for the various potential friend + // declarations have to be carefully written to work for friend + // objects, with the most important detail being that the target + // decl should almost certainly not be placed in Owner. + Decl *NewND = Visit(ND); + if (!NewND) return 0; + + FriendDecl *FD = + FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), + cast<NamedDecl>(NewND), D->getFriendLoc()); + FD->setAccess(AS_public); + FD->setUnsupportedFriend(D->isUnsupportedFriend()); + Owner->addDecl(FD); + return FD; +} + +Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) { + Expr *AssertExpr = D->getAssertExpr(); + + // The expression in a static assertion is a constant expression. + EnterExpressionEvaluationContext Unevaluated(SemaRef, + Sema::ConstantEvaluated); + + ExprResult InstantiatedAssertExpr + = SemaRef.SubstExpr(AssertExpr, TemplateArgs); + if (InstantiatedAssertExpr.isInvalid()) + return 0; + + ExprResult Message(D->getMessage()); + D->getMessage(); + return SemaRef.ActOnStaticAssertDeclaration(D->getLocation(), + InstantiatedAssertExpr.get(), + Message.get(), + D->getRParenLoc()); +} + +Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) { + EnumDecl *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); + } + } + + if (D->getDeclContext()->isFunctionOrMethod()) + SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, 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. + // FIXME: There appears to be no wording for what happens for an enum defined + // within a block scope, but we treat that much like a member template. Only + // instantiate the definition when visiting the definition in that case, since + // we will visit all redeclarations. + if (!Enum->isScoped() && Def && + (!D->getDeclContext()->isFunctionOrMethod() || D->isCompleteDefinition())) + 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.data(), Enumerators.size(), + 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.first != Found.second) { + PrevClassTemplate = dyn_cast<ClassTemplateDecl>(*Found.first); + if (PrevClassTemplate) + PrevDecl = PrevClassTemplate->getTemplatedDecl(); + } + } + + // If this isn't a friend, then it's a member template, in which + // case we just want to build the instantiation in the + // specialization. If it is a friend, we want to build it in + // the appropriate context. + DeclContext *DC = Owner; + if (isFriend) { + if (QualifierLoc) { + CXXScopeSpec SS; + SS.Adopt(QualifierLoc); + DC = SemaRef.computeDeclContext(SS); + if (!DC) return 0; + } else { + DC = SemaRef.FindInstantiatedContext(Pattern->getLocation(), + Pattern->getDeclContext(), + TemplateArgs); + } + + // Look for a previous declaration of the template in the owning + // context. + LookupResult R(SemaRef, Pattern->getDeclName(), Pattern->getLocation(), + Sema::LookupOrdinaryName, Sema::ForRedeclaration); + SemaRef.LookupQualifiedName(R, DC); + + if (R.isSingleResult()) { + PrevClassTemplate = R.getAsSingle<ClassTemplateDecl>(); + if (PrevClassTemplate) + PrevDecl = PrevClassTemplate->getTemplatedDecl(); + } + + if (!PrevClassTemplate && QualifierLoc) { + SemaRef.Diag(Pattern->getLocation(), diag::err_not_tag_in_scope) + << D->getTemplatedDecl()->getTagKind() << Pattern->getDeclName() << DC + << QualifierLoc.getSourceRange(); + return 0; + } + + bool AdoptedPreviousTemplateParams = false; + if (PrevClassTemplate) { + bool Complain = true; + + // HACK: libstdc++ 4.2.1 contains an ill-formed friend class + // template for struct std::tr1::__detail::_Map_base, where the + // template parameters of the friend declaration don't match the + // template parameters of the original declaration. In this one + // case, we don't complain about the ill-formed friend + // declaration. + if (isFriend && Pattern->getIdentifier() && + Pattern->getIdentifier()->isStr("_Map_base") && + DC->isNamespace() && + cast<NamespaceDecl>(DC)->getIdentifier() && + cast<NamespaceDecl>(DC)->getIdentifier()->isStr("__detail")) { + DeclContext *DCParent = DC->getParent(); + if (DCParent->isNamespace() && + cast<NamespaceDecl>(DCParent)->getIdentifier() && + cast<NamespaceDecl>(DCParent)->getIdentifier()->isStr("tr1")) { + DeclContext *DCParent2 = DCParent->getParent(); + if (DCParent2->isNamespace() && + cast<NamespaceDecl>(DCParent2)->getIdentifier() && + cast<NamespaceDecl>(DCParent2)->getIdentifier()->isStr("std") && + DCParent2->getParent()->isTranslationUnit()) + Complain = false; + } + } + + TemplateParameterList *PrevParams + = PrevClassTemplate->getTemplateParameters(); + + // Make sure the parameter lists match. + if (!SemaRef.TemplateParameterListsAreEqual(InstParams, PrevParams, + Complain, + Sema::TPL_TemplateMatch)) { + if (Complain) + return 0; + + AdoptedPreviousTemplateParams = true; + InstParams = PrevParams; + } + + // Do some additional validation, then merge default arguments + // from the existing declarations. + if (!AdoptedPreviousTemplateParams && + SemaRef.CheckTemplateParameterList(InstParams, PrevParams, + Sema::TPC_ClassTemplate)) + return 0; + } + } + + CXXRecordDecl *RecordInst + = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), DC, + Pattern->getLocStart(), Pattern->getLocation(), + Pattern->getIdentifier(), PrevDecl, + /*DelayTypeCreation=*/true); + + if (QualifierLoc) + RecordInst->setQualifierInfo(QualifierLoc); + + ClassTemplateDecl *Inst + = ClassTemplateDecl::Create(SemaRef.Context, DC, D->getLocation(), + D->getIdentifier(), InstParams, RecordInst, + PrevClassTemplate); + RecordInst->setDescribedClassTemplate(Inst); + + if (isFriend) { + if (PrevClassTemplate) + Inst->setAccess(PrevClassTemplate->getAccess()); + else + Inst->setAccess(D->getAccess()); + + Inst->setObjectOfFriendDecl(PrevClassTemplate != 0); + // TODO: do we want to track the instantiation progeny of this + // friend target decl? + } else { + Inst->setAccess(D->getAccess()); + if (!PrevClassTemplate) + Inst->setInstantiatedFromMemberTemplate(D); + } + + // Trigger creation of the type for the instantiation. + SemaRef.Context.getInjectedClassNameType(RecordInst, + Inst->getInjectedClassNameSpecialization()); + + // Finish handling of friends. + if (isFriend) { + DC->makeDeclVisibleInContext(Inst); + Inst->setLexicalDeclContext(Owner); + RecordInst->setLexicalDeclContext(Owner); + return Inst; + } + + if (D->isOutOfLine()) { + Inst->setLexicalDeclContext(D->getLexicalDeclContext()); + RecordInst->setLexicalDeclContext(D->getLexicalDeclContext()); + } + + Owner->addDecl(Inst); + + if (!PrevClassTemplate) { + // Queue up any out-of-line partial specializations of this member + // class template; the client will force their instantiation once + // the enclosing class has been instantiated. + SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; + D->getPartialSpecializations(PartialSpecs); + for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) + if (PartialSpecs[I]->isOutOfLine()) + OutOfLinePartialSpecs.push_back(std::make_pair(Inst, PartialSpecs[I])); + } + + return Inst; +} + +Decl * +TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl( + ClassTemplatePartialSpecializationDecl *D) { + ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate(); + + // Lookup the already-instantiated declaration in the instantiation + // of the class template and return that. + DeclContext::lookup_result Found + = Owner->lookup(ClassTemplate->getDeclName()); + if (Found.first == Found.second) + return 0; + + ClassTemplateDecl *InstClassTemplate + = dyn_cast<ClassTemplateDecl>(*Found.first); + if (!InstClassTemplate) + return 0; + + if (ClassTemplatePartialSpecializationDecl *Result + = InstClassTemplate->findPartialSpecInstantiatedFromMember(D)) + return Result; + + return InstantiateClassTemplatePartialSpecialization(InstClassTemplate, D); +} + +Decl * +TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) { + // Create a local instantiation scope for this function template, which + // will contain the instantiations of the template parameters and then get + // merged with the local instantiation scope for the function template + // itself. + LocalInstantiationScope Scope(SemaRef); + + TemplateParameterList *TempParams = D->getTemplateParameters(); + TemplateParameterList *InstParams = SubstTemplateParams(TempParams); + if (!InstParams) + return NULL; + + FunctionDecl *Instantiated = 0; + if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl())) + Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod, + InstParams)); + else + Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl( + D->getTemplatedDecl(), + InstParams)); + + if (!Instantiated) + return 0; + + Instantiated->setAccess(D->getAccess()); + + // Link the instantiated function template declaration to the function + // template from which it was instantiated. + FunctionTemplateDecl *InstTemplate + = Instantiated->getDescribedFunctionTemplate(); + InstTemplate->setAccess(D->getAccess()); + assert(InstTemplate && + "VisitFunctionDecl/CXXMethodDecl didn't create a template!"); + + bool isFriend = (InstTemplate->getFriendObjectKind() != Decl::FOK_None); + + // Link the instantiation back to the pattern *unless* this is a + // non-definition friend declaration. + if (!InstTemplate->getInstantiatedFromMemberTemplate() && + !(isFriend && !D->getTemplatedDecl()->isThisDeclarationADefinition())) + InstTemplate->setInstantiatedFromMemberTemplate(D); + + // Make declarations visible in the appropriate context. + if (!isFriend) + Owner->addDecl(InstTemplate); + + return InstTemplate; +} + +Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) { + CXXRecordDecl *PrevDecl = 0; + if (D->isInjectedClassName()) + PrevDecl = cast<CXXRecordDecl>(Owner); + else if (D->getPreviousDecl()) { + NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getLocation(), + D->getPreviousDecl(), + TemplateArgs); + if (!Prev) return 0; + PrevDecl = cast<CXXRecordDecl>(Prev); + } + + CXXRecordDecl *Record + = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner, + D->getLocStart(), D->getLocation(), + D->getIdentifier(), PrevDecl); + + // Substitute the nested name specifier, if any. + if (SubstQualifier(D, Record)) + return 0; + + Record->setImplicit(D->isImplicit()); + // FIXME: Check against AS_none is an ugly hack to work around the issue that + // the tag decls introduced by friend class declarations don't have an access + // specifier. Remove once this area of the code gets sorted out. + if (D->getAccess() != AS_none) + Record->setAccess(D->getAccess()); + if (!D->isInjectedClassName()) + Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation); + + // If the original function was part of a friend declaration, + // inherit its namespace state. + if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) + Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared); + + // Make sure that anonymous structs and unions are recorded. + if (D->isAnonymousStructOrUnion()) { + Record->setAnonymousStructOrUnion(true); + if (Record->getDeclContext()->getRedeclContext()->isFunctionOrMethod()) + SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Record); + } + + Owner->addDecl(Record); + return Record; +} + +/// Normal class members are of more specific types and therefore +/// don't make it here. This function serves two purposes: +/// 1) instantiating function templates +/// 2) substituting friend declarations +/// FIXME: preserve function definitions in case #2 +Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, + TemplateParameterList *TemplateParams) { + // Check whether there is already a function template specialization for + // this declaration. + FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); + if (FunctionTemplate && !TemplateParams) { + std::pair<const TemplateArgument *, unsigned> Innermost + = TemplateArgs.getInnermost(); + + void *InsertPos = 0; + FunctionDecl *SpecFunc + = FunctionTemplate->findSpecialization(Innermost.first, Innermost.second, + InsertPos); + + // If we already have a function template specialization, return it. + if (SpecFunc) + return SpecFunc; + } + + bool isFriend; + if (FunctionTemplate) + isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None); + else + isFriend = (D->getFriendObjectKind() != Decl::FOK_None); + + bool MergeWithParentScope = (TemplateParams != 0) || + Owner->isFunctionOrMethod() || + !(isa<Decl>(Owner) && + cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod()); + LocalInstantiationScope Scope(SemaRef, MergeWithParentScope); + + SmallVector<ParmVarDecl *, 4> Params; + TypeSourceInfo *TInfo = SubstFunctionType(D, Params); + if (!TInfo) + return 0; + QualType T = TInfo->getType(); + + NestedNameSpecifierLoc QualifierLoc = D->getQualifierLoc(); + if (QualifierLoc) { + QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, + TemplateArgs); + if (!QualifierLoc) + return 0; + } + + // If we're instantiating a local function declaration, put the result + // in the owner; otherwise we need to find the instantiated context. + DeclContext *DC; + if (D->getDeclContext()->isFunctionOrMethod()) + DC = Owner; + else if (isFriend && QualifierLoc) { + CXXScopeSpec SS; + SS.Adopt(QualifierLoc); + DC = SemaRef.computeDeclContext(SS); + if (!DC) return 0; + } else { + DC = SemaRef.FindInstantiatedContext(D->getLocation(), D->getDeclContext(), + TemplateArgs); + } + + FunctionDecl *Function = + FunctionDecl::Create(SemaRef.Context, DC, D->getInnerLocStart(), + D->getLocation(), D->getDeclName(), T, TInfo, + D->getStorageClass(), D->getStorageClassAsWritten(), + D->isInlineSpecified(), D->hasWrittenPrototype(), + D->isConstexpr()); + + if (QualifierLoc) + Function->setQualifierInfo(QualifierLoc); + + DeclContext *LexicalDC = Owner; + if (!isFriend && D->isOutOfLine()) { + assert(D->getDeclContext()->isFileContext()); + LexicalDC = D->getDeclContext(); + } + + Function->setLexicalDeclContext(LexicalDC); + + // Attach the parameters + if (isa<FunctionProtoType>(Function->getType().IgnoreParens())) { + // Adopt the already-instantiated parameters into our own context. + for (unsigned P = 0; P < Params.size(); ++P) + if (Params[P]) + Params[P]->setOwningFunction(Function); + } else { + // Since we were instantiated via a typedef of a function type, create + // new parameters. + const FunctionProtoType *Proto + = Function->getType()->getAs<FunctionProtoType>(); + assert(Proto && "No function prototype in template instantiation?"); + for (FunctionProtoType::arg_type_iterator AI = Proto->arg_type_begin(), + AE = Proto->arg_type_end(); AI != AE; ++AI) { + ParmVarDecl *Param + = SemaRef.BuildParmVarDeclForTypedef(Function, Function->getLocation(), + *AI); + Param->setScopeInfo(0, Params.size()); + Params.push_back(Param); + } + } + Function->setParams(Params); + + SourceLocation InstantiateAtPOI; + if (TemplateParams) { + // Our resulting instantiation is actually a function template, since we + // are substituting only the outer template parameters. For example, given + // + // template<typename T> + // struct X { + // template<typename U> friend void f(T, U); + // }; + // + // X<int> x; + // + // We are instantiating the friend function template "f" within X<int>, + // which means substituting int for T, but leaving "f" as a friend function + // template. + // Build the function template itself. + FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, DC, + Function->getLocation(), + Function->getDeclName(), + TemplateParams, Function); + Function->setDescribedFunctionTemplate(FunctionTemplate); + + FunctionTemplate->setLexicalDeclContext(LexicalDC); + + if (isFriend && D->isThisDeclarationADefinition()) { + // TODO: should we remember this connection regardless of whether + // the friend declaration provided a body? + FunctionTemplate->setInstantiatedFromMemberTemplate( + D->getDescribedFunctionTemplate()); + } + } else if (FunctionTemplate) { + // Record this function template specialization. + std::pair<const TemplateArgument *, unsigned> Innermost + = TemplateArgs.getInnermost(); + Function->setFunctionTemplateSpecialization(FunctionTemplate, + TemplateArgumentList::CreateCopy(SemaRef.Context, + Innermost.first, + Innermost.second), + /*InsertPos=*/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(), + Sema::LookupOrdinaryName, Sema::ForRedeclaration); + + if (DependentFunctionTemplateSpecializationInfo *Info + = D->getDependentSpecializationInfo()) { + assert(isFriend && "non-friend has dependent specialization info?"); + + // This needs to be set now for future sanity. + Function->setObjectOfFriendDecl(/*HasPrevious*/ true); + + // Instantiate the explicit template arguments. + TemplateArgumentListInfo ExplicitArgs(Info->getLAngleLoc(), + Info->getRAngleLoc()); + if (SemaRef.Subst(Info->getTemplateArgs(), Info->getNumTemplateArgs(), + ExplicitArgs, TemplateArgs)) + return 0; + + // Map the candidate templates to their instantiations. + for (unsigned I = 0, E = Info->getNumTemplates(); I != E; ++I) { + Decl *Temp = SemaRef.FindInstantiatedDecl(D->getLocation(), + Info->getTemplate(I), + TemplateArgs); + if (!Temp) return 0; + + Previous.addDecl(cast<FunctionTemplateDecl>(Temp)); + } + + if (SemaRef.CheckFunctionTemplateSpecialization(Function, + &ExplicitArgs, + Previous)) + Function->setInvalidDecl(); + + isExplicitSpecialization = true; + + } else if (TemplateParams || !FunctionTemplate) { + // Look only into the namespace where the friend would be declared to + // find a previous declaration. This is the innermost enclosing namespace, + // as described in ActOnFriendFunctionDecl. + SemaRef.LookupQualifiedName(Previous, DC); + + // In C++, the previous declaration we find might be a tag type + // (class or enum). In this case, the new declaration will hide the + // tag type. Note that this does does not apply if we're declaring a + // typedef (C++ [dcl.typedef]p4). + if (Previous.isSingleTagDecl()) + Previous.clear(); + } + + SemaRef.CheckFunctionDeclaration(/*Scope*/ 0, Function, Previous, + isExplicitSpecialization); + + NamedDecl *PrincipalDecl = (TemplateParams + ? cast<NamedDecl>(FunctionTemplate) + : Function); + + // If the original function was part of a friend declaration, + // inherit its namespace state and add it to the owner. + if (isFriend) { + NamedDecl *PrevDecl; + if (TemplateParams) + PrevDecl = FunctionTemplate->getPreviousDecl(); + else + PrevDecl = Function->getPreviousDecl(); + + PrincipalDecl->setObjectOfFriendDecl(PrevDecl != 0); + DC->makeDeclVisibleInContext(PrincipalDecl); + + 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().CPlusPlus0x || + SemaRef.Diags.getDiagnosticLevel( + diag::warn_cxx98_compat_friend_redefinition, + Function->getLocation()) + != DiagnosticsEngine::Ignored) && + D->isThisDeclarationADefinition()) { + // Check for a function body. + const FunctionDecl *Definition = 0; + if (Function->isDefined(Definition) && + Definition->getTemplateSpecializationKind() == TSK_Undeclared) { + SemaRef.Diag(Function->getLocation(), + SemaRef.getLangOpts().CPlusPlus0x ? + diag::warn_cxx98_compat_friend_redefinition : + diag::err_redefinition) << Function->getDeclName(); + SemaRef.Diag(Definition->getLocation(), diag::note_previous_definition); + if (!SemaRef.getLangOpts().CPlusPlus0x) + Function->setInvalidDecl(); + } + // Check for redefinitions due to other instantiations of this or + // a similar friend function. + else for (FunctionDecl::redecl_iterator R = Function->redecls_begin(), + REnd = Function->redecls_end(); + R != REnd; ++R) { + if (*R == Function) + continue; + switch (R->getFriendObjectKind()) { + case Decl::FOK_None: + if (!SemaRef.getLangOpts().CPlusPlus0x && + !queuedInstantiation && R->isUsed(false)) { + if (MemberSpecializationInfo *MSInfo + = Function->getMemberSpecializationInfo()) { + if (MSInfo->getPointOfInstantiation().isInvalid()) { + SourceLocation Loc = R->getLocation(); // FIXME + MSInfo->setPointOfInstantiation(Loc); + SemaRef.PendingLocalImplicitInstantiations.push_back( + std::make_pair(Function, Loc)); + queuedInstantiation = true; + } + } + } + break; + default: + if (const FunctionDecl *RPattern + = R->getTemplateInstantiationPattern()) + if (RPattern->isDefined(RPattern)) { + SemaRef.Diag(Function->getLocation(), + SemaRef.getLangOpts().CPlusPlus0x ? + diag::warn_cxx98_compat_friend_redefinition : + diag::err_redefinition) + << Function->getDeclName(); + SemaRef.Diag(R->getLocation(), diag::note_previous_definition); + if (!SemaRef.getLangOpts().CPlusPlus0x) + Function->setInvalidDecl(); + break; + } + } + } + } + } + + if (Function->isOverloadedOperator() && !DC->isRecord() && + PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) + PrincipalDecl->setNonMemberOperator(); + + assert(!D->isDefaulted() && "only methods should be defaulted"); + return Function; +} + +Decl * +TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, + TemplateParameterList *TemplateParams, + bool IsClassScopeSpecialization) { + FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); + if (FunctionTemplate && !TemplateParams) { + // We are creating a function template specialization from a function + // template. Check whether there is already a function template + // specialization for this particular set of template arguments. + std::pair<const TemplateArgument *, unsigned> Innermost + = TemplateArgs.getInnermost(); + + void *InsertPos = 0; + FunctionDecl *SpecFunc + = FunctionTemplate->findSpecialization(Innermost.first, Innermost.second, + InsertPos); + + // If we already have a function template specialization, return it. + if (SpecFunc) + return SpecFunc; + } + + bool isFriend; + if (FunctionTemplate) + isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None); + else + isFriend = (D->getFriendObjectKind() != Decl::FOK_None); + + bool MergeWithParentScope = (TemplateParams != 0) || + !(isa<Decl>(Owner) && + cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod()); + LocalInstantiationScope Scope(SemaRef, MergeWithParentScope); + + // Instantiate enclosing template arguments for friends. + SmallVector<TemplateParameterList *, 4> TempParamLists; + unsigned NumTempParamLists = 0; + if (isFriend && (NumTempParamLists = D->getNumTemplateParameterLists())) { + TempParamLists.set_size(NumTempParamLists); + for (unsigned I = 0; I != NumTempParamLists; ++I) { + TemplateParameterList *TempParams = D->getTemplateParameterList(I); + TemplateParameterList *InstParams = SubstTemplateParams(TempParams); + if (!InstParams) + return NULL; + TempParamLists[I] = InstParams; + } + } + + SmallVector<ParmVarDecl *, 4> Params; + TypeSourceInfo *TInfo = SubstFunctionType(D, Params); + if (!TInfo) + return 0; + QualType T = TInfo->getType(); + + // \brief If the type of this function, after ignoring parentheses, + // is not *directly* a function type, then we're instantiating a function + // that was declared via a typedef, e.g., + // + // typedef int functype(int, int); + // functype func; + // + // In this case, we'll just go instantiate the ParmVarDecls that we + // synthesized in the method declaration. + if (!isa<FunctionProtoType>(T.IgnoreParens())) { + assert(!Params.size() && "Instantiating type could not yield parameters"); + SmallVector<QualType, 4> ParamTypes; + if (SemaRef.SubstParmTypes(D->getLocation(), D->param_begin(), + D->getNumParams(), TemplateArgs, ParamTypes, + &Params)) + return 0; + } + + NestedNameSpecifierLoc QualifierLoc = D->getQualifierLoc(); + if (QualifierLoc) { + QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, + TemplateArgs); + if (!QualifierLoc) + return 0; + } + + DeclContext *DC = Owner; + if (isFriend) { + if (QualifierLoc) { + CXXScopeSpec SS; + SS.Adopt(QualifierLoc); + DC = SemaRef.computeDeclContext(SS); + + if (DC && SemaRef.RequireCompleteDeclContext(SS, DC)) + return 0; + } else { + DC = SemaRef.FindInstantiatedContext(D->getLocation(), + D->getDeclContext(), + TemplateArgs); + } + if (!DC) return 0; + } + + // Build the instantiated method declaration. + CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); + CXXMethodDecl *Method = 0; + + SourceLocation StartLoc = D->getInnerLocStart(); + DeclarationNameInfo NameInfo + = SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs); + if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { + Method = CXXConstructorDecl::Create(SemaRef.Context, Record, + StartLoc, NameInfo, T, TInfo, + Constructor->isExplicit(), + Constructor->isInlineSpecified(), + false, Constructor->isConstexpr()); + } 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 { + Method = CXXMethodDecl::Create(SemaRef.Context, Record, + StartLoc, NameInfo, T, TInfo, + D->isStatic(), + D->getStorageClassAsWritten(), + D->isInlineSpecified(), + D->isConstexpr(), D->getLocEnd()); + } + + if (QualifierLoc) + Method->setQualifierInfo(QualifierLoc); + + if (TemplateParams) { + // Our resulting instantiation is actually a function template, since we + // are substituting only the outer template parameters. For example, given + // + // template<typename T> + // struct X { + // template<typename U> void f(T, U); + // }; + // + // X<int> x; + // + // We are instantiating the member template "f" within X<int>, which means + // substituting int for T, but leaving "f" as a member function template. + // Build the function template itself. + FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record, + Method->getLocation(), + Method->getDeclName(), + TemplateParams, Method); + if (isFriend) { + FunctionTemplate->setLexicalDeclContext(Owner); + FunctionTemplate->setObjectOfFriendDecl(true); + } else if (D->isOutOfLine()) + FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); + Method->setDescribedFunctionTemplate(FunctionTemplate); + } else if (FunctionTemplate) { + // Record this function template specialization. + std::pair<const TemplateArgument *, unsigned> Innermost + = TemplateArgs.getInnermost(); + Method->setFunctionTemplateSpecialization(FunctionTemplate, + TemplateArgumentList::CreateCopy(SemaRef.Context, + Innermost.first, + Innermost.second), + /*InsertPos=*/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(true); + } else if (D->isOutOfLine()) + Method->setLexicalDeclContext(D->getLexicalDeclContext()); + + // Attach the parameters + for (unsigned P = 0; P < Params.size(); ++P) + Params[P]->setOwningFunction(Method); + Method->setParams(Params); + + if (InitMethodInstantiation(Method, D)) + Method->setInvalidDecl(); + + LookupResult Previous(SemaRef, NameInfo, Sema::LookupOrdinaryName, + Sema::ForRedeclaration); + + if (!FunctionTemplate || TemplateParams || isFriend) { + SemaRef.LookupQualifiedName(Previous, Record); + + // In C++, the previous declaration we find might be a tag type + // (class or enum). In this case, the new declaration will hide the + // tag type. Note that this does does not apply if we're declaring a + // typedef (C++ [dcl.typedef]p4). + if (Previous.isSingleTagDecl()) + Previous.clear(); + } + + if (!IsClassScopeSpecialization) + SemaRef.CheckFunctionDeclaration(0, Method, Previous, false); + + if (D->isPure()) + SemaRef.CheckPureMethod(Method, SourceRange()); + + Method->setAccess(D->getAccess()); + + SemaRef.CheckOverrideControl(Method); + + // If a function is defined as defaulted or deleted, mark it as such now. + if (D->isDefaulted()) + Method->setDefaulted(); + if (D->isDeletedAsWritten()) + Method->setDeletedAsWritten(); + + if (FunctionTemplate) { + // If there's a function template, let our caller handle it. + } else if (Method->isInvalidDecl() && !Previous.empty()) { + // Don't hide a (potentially) valid declaration with an invalid one. + } else { + NamedDecl *DeclToAdd = (TemplateParams + ? cast<NamedDecl>(FunctionTemplate) + : Method); + if (isFriend) + Record->makeDeclVisibleInContext(DeclToAdd); + else if (!IsClassScopeSpecialization) + Owner->addDecl(DeclToAdd); + } + + if (D->isExplicitlyDefaulted()) { + SemaRef.SetDeclDefaulted(Method, Method->getLocation()); + } else { + assert(!D->isDefaulted() && + "should not implicitly default uninstantiated function"); + } + + return Method; +} + +Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) { + return VisitCXXMethodDecl(D); +} + +Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) { + return VisitCXXMethodDecl(D); +} + +Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) { + return VisitCXXMethodDecl(D); +} + +ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { + return SemaRef.SubstParmVarDecl(D, TemplateArgs, /*indexAdjustment*/ 0, + llvm::Optional<unsigned>(), + /*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()) + Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false); + + // Introduce this template parameter's instantiation into the instantiation + // scope. + SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst); + + return Inst; +} + +Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl( + NonTypeTemplateParmDecl *D) { + // Substitute into the type of the non-type template parameter. + TypeLoc TL = D->getTypeSourceInfo()->getTypeLoc(); + SmallVector<TypeSourceInfo *, 4> ExpandedParameterPackTypesAsWritten; + SmallVector<QualType, 4> ExpandedParameterPackTypes; + bool IsExpandedParameterPack = false; + TypeSourceInfo *DI; + QualType T; + bool Invalid = false; + + if (D->isExpandedParameterPack()) { + // The non-type template parameter pack is an already-expanded pack + // expansion of types. Substitute into each of the expanded types. + ExpandedParameterPackTypes.reserve(D->getNumExpansionTypes()); + ExpandedParameterPackTypesAsWritten.reserve(D->getNumExpansionTypes()); + for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) { + TypeSourceInfo *NewDI =SemaRef.SubstType(D->getExpansionTypeSourceInfo(I), + TemplateArgs, + D->getLocation(), + D->getDeclName()); + if (!NewDI) + return 0; + + ExpandedParameterPackTypesAsWritten.push_back(NewDI); + QualType NewT =SemaRef.CheckNonTypeTemplateParameterType(NewDI->getType(), + D->getLocation()); + if (NewT.isNull()) + return 0; + ExpandedParameterPackTypes.push_back(NewT); + } + + IsExpandedParameterPack = true; + DI = D->getTypeSourceInfo(); + T = DI->getType(); + } else if (isa<PackExpansionTypeLoc>(TL)) { + // The non-type template parameter pack's type is a pack expansion of types. + // Determine whether we need to expand this parameter pack into separate + // types. + PackExpansionTypeLoc Expansion = cast<PackExpansionTypeLoc>(TL); + TypeLoc Pattern = Expansion.getPatternLoc(); + SmallVector<UnexpandedParameterPack, 2> Unexpanded; + SemaRef.collectUnexpandedParameterPacks(Pattern, Unexpanded); + + // Determine whether the set of unexpanded parameter packs can and should + // be expanded. + bool Expand = true; + bool RetainExpansion = false; + llvm::Optional<unsigned> OrigNumExpansions + = Expansion.getTypePtr()->getNumExpansions(); + llvm::Optional<unsigned> NumExpansions = OrigNumExpansions; + if (SemaRef.CheckParameterPacksForExpansion(Expansion.getEllipsisLoc(), + Pattern.getSourceRange(), + Unexpanded, + TemplateArgs, + Expand, RetainExpansion, + NumExpansions)) + return 0; + + if (Expand) { + for (unsigned I = 0; I != *NumExpansions; ++I) { + Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, I); + TypeSourceInfo *NewDI = SemaRef.SubstType(Pattern, TemplateArgs, + D->getLocation(), + D->getDeclName()); + if (!NewDI) + return 0; + + ExpandedParameterPackTypesAsWritten.push_back(NewDI); + QualType NewT = SemaRef.CheckNonTypeTemplateParameterType( + NewDI->getType(), + D->getLocation()); + if (NewT.isNull()) + return 0; + ExpandedParameterPackTypes.push_back(NewT); + } + + // Note that we have an expanded parameter pack. The "type" of this + // expanded parameter pack is the original expansion type, but callers + // will end up using the expanded parameter pack types for type-checking. + IsExpandedParameterPack = true; + DI = D->getTypeSourceInfo(); + T = DI->getType(); + } else { + // We cannot fully expand the pack expansion now, so substitute into the + // pattern and create a new pack expansion type. + Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1); + TypeSourceInfo *NewPattern = SemaRef.SubstType(Pattern, TemplateArgs, + D->getLocation(), + D->getDeclName()); + if (!NewPattern) + return 0; + + DI = SemaRef.CheckPackExpansion(NewPattern, Expansion.getEllipsisLoc(), + NumExpansions); + if (!DI) + return 0; + + T = DI->getType(); + } + } else { + // Simple case: substitution into a parameter that is not a parameter pack. + DI = SemaRef.SubstType(D->getTypeSourceInfo(), TemplateArgs, + D->getLocation(), D->getDeclName()); + if (!DI) + return 0; + + // Check that this type is acceptable for a non-type template parameter. + T = SemaRef.CheckNonTypeTemplateParameterType(DI->getType(), + D->getLocation()); + if (T.isNull()) { + T = SemaRef.Context.IntTy; + Invalid = true; + } + } + + NonTypeTemplateParmDecl *Param; + if (IsExpandedParameterPack) + Param = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, + D->getInnerLocStart(), + D->getLocation(), + D->getDepth() - TemplateArgs.getNumLevels(), + D->getPosition(), + D->getIdentifier(), T, + DI, + ExpandedParameterPackTypes.data(), + ExpandedParameterPackTypes.size(), + ExpandedParameterPackTypesAsWritten.data()); + else + Param = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, + D->getInnerLocStart(), + D->getLocation(), + D->getDepth() - TemplateArgs.getNumLevels(), + D->getPosition(), + D->getIdentifier(), T, + D->isParameterPack(), DI); + + Param->setAccess(AS_public); + if (Invalid) + Param->setInvalidDecl(); + + Param->setDefaultArgument(D->getDefaultArgument(), false); + + // Introduce this template parameter's instantiation into the instantiation + // scope. + SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); + return Param; +} + +Decl * +TemplateDeclInstantiator::VisitTemplateTemplateParmDecl( + TemplateTemplateParmDecl *D) { + // Instantiate the template parameter list of the template template parameter. + TemplateParameterList *TempParams = D->getTemplateParameters(); + TemplateParameterList *InstParams; + { + // Perform the actual substitution of template parameters within a new, + // local instantiation scope. + LocalInstantiationScope Scope(SemaRef); + InstParams = SubstTemplateParams(TempParams); + if (!InstParams) + return NULL; + } + + // Build the template template parameter. + TemplateTemplateParmDecl *Param + = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), + D->getDepth() - TemplateArgs.getNumLevels(), + D->getPosition(), D->isParameterPack(), + D->getIdentifier(), InstParams); + Param->setDefaultArgument(D->getDefaultArgument(), false); + Param->setAccess(AS_public); + + // Introduce this template parameter's instantiation into the instantiation + // scope. + SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); + + return Param; +} + +Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) { + // Using directives are never dependent (and never contain any types or + // expressions), so they require no explicit instantiation work. + + UsingDirectiveDecl *Inst + = UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(), + D->getNamespaceKeyLocation(), + D->getQualifierLoc(), + D->getIdentLocation(), + D->getNominatedNamespace(), + D->getCommonAncestor()); + Owner->addDecl(Inst); + return Inst; +} + +Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) { + + // The nested name specifier may be dependent, for example + // template <typename T> struct t { + // struct s1 { T f1(); }; + // struct s2 : s1 { using s1::f1; }; + // }; + // template struct t<int>; + // Here, in using s1::f1, s1 refers to t<T>::s1; + // we need to substitute for t<int>::s1. + NestedNameSpecifierLoc QualifierLoc + = SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(), + TemplateArgs); + if (!QualifierLoc) + return 0; + + // The name info is non-dependent, so no transformation + // is required. + DeclarationNameInfo NameInfo = D->getNameInfo(); + + // We only need to do redeclaration lookups if we're in a class + // scope (in fact, it's not really even possible in non-class + // scopes). + bool CheckRedeclaration = Owner->isRecord(); + + LookupResult Prev(SemaRef, NameInfo, Sema::LookupUsingDeclName, + Sema::ForRedeclaration); + + UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner, + D->getUsingLocation(), + QualifierLoc, + NameInfo, + D->isTypeName()); + + CXXScopeSpec SS; + SS.Adopt(QualifierLoc); + if (CheckRedeclaration) { + Prev.setHideTags(false); + SemaRef.LookupQualifiedName(Prev, Owner); + + // Check for invalid redeclarations. + if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(), + D->isTypeName(), SS, + D->getLocation(), Prev)) + NewUD->setInvalidDecl(); + + } + + if (!NewUD->isInvalidDecl() && + SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS, + D->getLocation())) + NewUD->setInvalidDecl(); + + SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D); + NewUD->setAccess(D->getAccess()); + Owner->addDecl(NewUD); + + // Don't process the shadow decls for an invalid decl. + if (NewUD->isInvalidDecl()) + return NewUD; + + 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; + + if (CheckRedeclaration && + SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev)) + continue; + + UsingShadowDecl *InstShadow + = SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget); + SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow); + + if (isFunctionScope) + SemaRef.CurrentInstantiationScope->InstantiatedLocal(Shadow, InstShadow); + } + + return NewUD; +} + +Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) { + // Ignore these; we handle them in bulk when processing the UsingDecl. + return 0; +} + +Decl * TemplateDeclInstantiator + ::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) { + NestedNameSpecifierLoc QualifierLoc + = SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(), + TemplateArgs); + if (!QualifierLoc) + return 0; + + CXXScopeSpec SS; + SS.Adopt(QualifierLoc); + + // Since NameInfo refers to a typename, it cannot be a C++ special name. + // Hence, no tranformation is required for it. + DeclarationNameInfo NameInfo(D->getDeclName(), D->getLocation()); + NamedDecl *UD = + SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), + D->getUsingLoc(), SS, NameInfo, 0, + /*instantiation*/ true, + /*typename*/ true, D->getTypenameLoc()); + if (UD) + SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D); + + return UD; +} + +Decl * TemplateDeclInstantiator + ::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) { + NestedNameSpecifierLoc QualifierLoc + = SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(), TemplateArgs); + if (!QualifierLoc) + return 0; + + CXXScopeSpec SS; + SS.Adopt(QualifierLoc); + + DeclarationNameInfo NameInfo + = SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs); + + NamedDecl *UD = + SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), + D->getUsingLoc(), SS, NameInfo, 0, + /*instantiation*/ true, + /*typename*/ false, SourceLocation()); + if (UD) + SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D); + + return UD; +} + + +Decl *TemplateDeclInstantiator::VisitClassScopeFunctionSpecializationDecl( + ClassScopeFunctionSpecializationDecl *Decl) { + CXXMethodDecl *OldFD = Decl->getSpecialization(); + CXXMethodDecl *NewFD = cast<CXXMethodDecl>(VisitCXXMethodDecl(OldFD, 0, true)); + + LookupResult Previous(SemaRef, NewFD->getNameInfo(), Sema::LookupOrdinaryName, + Sema::ForRedeclaration); + + SemaRef.LookupQualifiedName(Previous, SemaRef.CurContext); + if (SemaRef.CheckFunctionTemplateSpecialization(NewFD, 0, Previous)) { + NewFD->setInvalidDecl(); + return NewFD; + } + + // Associate the specialization with the pattern. + FunctionDecl *Specialization = cast<FunctionDecl>(Previous.getFoundDecl()); + assert(Specialization && "Class scope Specialization is null"); + SemaRef.Context.setClassScopeSpecializationPattern(Specialization, OldFD); + + return NewFD; +} + +Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner, + const MultiLevelTemplateArgumentList &TemplateArgs) { + TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs); + if (D->isInvalidDecl()) + return 0; + + return Instantiator.Visit(D); +} + +/// \brief Instantiates a nested template parameter list in the current +/// instantiation context. +/// +/// \param L The parameter list to instantiate +/// +/// \returns NULL if there was an error +TemplateParameterList * +TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) { + // Get errors for all the parameters before bailing out. + bool Invalid = false; + + unsigned N = L->size(); + typedef SmallVector<NamedDecl *, 8> ParamVector; + ParamVector Params; + Params.reserve(N); + for (TemplateParameterList::iterator PI = L->begin(), PE = L->end(); + PI != PE; ++PI) { + NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI)); + Params.push_back(D); + Invalid = Invalid || !D || D->isInvalidDecl(); + } + + // Clean up if we had an error. + if (Invalid) + return NULL; + + TemplateParameterList *InstL + = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(), + L->getLAngleLoc(), &Params.front(), N, + L->getRAngleLoc()); + return InstL; +} + +/// \brief Instantiate the declaration of a class template partial +/// specialization. +/// +/// \param ClassTemplate the (instantiated) class template that is partially +// specialized by the instantiation of \p PartialSpec. +/// +/// \param PartialSpec the (uninstantiated) class template partial +/// specialization that we are instantiating. +/// +/// \returns The instantiated partial specialization, if successful; otherwise, +/// NULL to indicate an error. +ClassTemplatePartialSpecializationDecl * +TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization( + ClassTemplateDecl *ClassTemplate, + ClassTemplatePartialSpecializationDecl *PartialSpec) { + // Create a local instantiation scope for this class template partial + // specialization, which will contain the instantiations of the template + // parameters. + LocalInstantiationScope Scope(SemaRef); + + // Substitute into the template parameters of the class template partial + // specialization. + TemplateParameterList *TempParams = PartialSpec->getTemplateParameters(); + TemplateParameterList *InstParams = SubstTemplateParams(TempParams); + if (!InstParams) + return 0; + + // Substitute into the template arguments of the class template partial + // specialization. + TemplateArgumentListInfo InstTemplateArgs; // no angle locations + if (SemaRef.Subst(PartialSpec->getTemplateArgsAsWritten(), + PartialSpec->getNumTemplateArgsAsWritten(), + InstTemplateArgs, TemplateArgs)) + return 0; + + // Check that the template argument list is well-formed for this + // class template. + SmallVector<TemplateArgument, 4> Converted; + if (SemaRef.CheckTemplateArgumentList(ClassTemplate, + PartialSpec->getLocation(), + InstTemplateArgs, + false, + Converted)) + return 0; + + // Figure out where to insert this class template partial specialization + // in the member template's set of class template partial specializations. + void *InsertPos = 0; + ClassTemplateSpecializationDecl *PrevDecl + = ClassTemplate->findPartialSpecialization(Converted.data(), + Converted.size(), InsertPos); + + // Build the canonical type that describes the converted template + // arguments of the class template partial specialization. + QualType CanonType + = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate), + Converted.data(), + Converted.size()); + + // Build the fully-sugared type for this class template + // specialization as the user wrote in the specialization + // itself. This means that we'll pretty-print the type retrieved + // from the specialization's declaration the way that the user + // actually wrote the specialization, rather than formatting the + // name based on the "canonical" representation used to store the + // template arguments in the specialization. + TypeSourceInfo *WrittenTy + = SemaRef.Context.getTemplateSpecializationTypeInfo( + TemplateName(ClassTemplate), + PartialSpec->getLocation(), + InstTemplateArgs, + CanonType); + + if (PrevDecl) { + // We've already seen a partial specialization with the same template + // parameters and template arguments. This can happen, for example, when + // substituting the outer template arguments ends up causing two + // class template partial specializations of a member class template + // to have identical forms, e.g., + // + // template<typename T, typename U> + // struct Outer { + // template<typename X, typename Y> struct Inner; + // template<typename Y> struct Inner<T, Y>; + // template<typename Y> struct Inner<U, Y>; + // }; + // + // Outer<int, int> outer; // error: the partial specializations of Inner + // // have the same signature. + SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared) + << WrittenTy->getType(); + SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here) + << SemaRef.Context.getTypeDeclType(PrevDecl); + return 0; + } + + + // Create the class template partial specialization declaration. + ClassTemplatePartialSpecializationDecl *InstPartialSpec + = ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context, + PartialSpec->getTagKind(), + Owner, + PartialSpec->getLocStart(), + PartialSpec->getLocation(), + InstParams, + ClassTemplate, + Converted.data(), + Converted.size(), + InstTemplateArgs, + CanonType, + 0, + ClassTemplate->getNextPartialSpecSequenceNumber()); + // Substitute the nested name specifier, if any. + if (SubstQualifier(PartialSpec, InstPartialSpec)) + return 0; + + InstPartialSpec->setInstantiatedFromMember(PartialSpec); + InstPartialSpec->setTypeAsWritten(WrittenTy); + + // Add this partial specialization to the set of class template partial + // specializations. + ClassTemplate->AddPartialSpecialization(InstPartialSpec, /*InsertPos=*/0); + 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 = Method->getParent(); + ThisTypeQuals = Method->getTypeQualifiers(); + } + + TypeSourceInfo *NewTInfo + = SemaRef.SubstFunctionDeclType(OldTInfo, TemplateArgs, + D->getTypeSpecStartLoc(), + D->getDeclName(), + ThisContext, ThisTypeQuals); + if (!NewTInfo) + return 0; + + if (NewTInfo != OldTInfo) { + // Get parameters from the new type info. + TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens(); + if (FunctionProtoTypeLoc *OldProtoLoc + = dyn_cast<FunctionProtoTypeLoc>(&OldTL)) { + TypeLoc NewTL = NewTInfo->getTypeLoc().IgnoreParens(); + FunctionProtoTypeLoc *NewProtoLoc = cast<FunctionProtoTypeLoc>(&NewTL); + assert(NewProtoLoc && "Missing prototype?"); + unsigned NewIdx = 0, NumNewParams = NewProtoLoc->getNumArgs(); + for (unsigned OldIdx = 0, NumOldParams = OldProtoLoc->getNumArgs(); + OldIdx != NumOldParams; ++OldIdx) { + ParmVarDecl *OldParam = OldProtoLoc->getArg(OldIdx); + if (!OldParam->isParameterPack() || + // FIXME: Is this right? OldParam could expand to an empty parameter + // pack and the next parameter could be an unexpanded parameter pack + (NewIdx < NumNewParams && + NewProtoLoc->getArg(NewIdx)->isParameterPack())) { + // Simple case: normal parameter, or a parameter pack that's + // instantiated to a (still-dependent) parameter pack. + ParmVarDecl *NewParam = NewProtoLoc->getArg(NewIdx++); + Params.push_back(NewParam); + SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam, + NewParam); + continue; + } + + // Parameter pack: make the instantiation an argument pack. + SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack( + OldParam); + unsigned NumArgumentsInExpansion + = SemaRef.getNumArgumentsInExpansion(OldParam->getType(), + TemplateArgs); + while (NumArgumentsInExpansion--) { + ParmVarDecl *NewParam = NewProtoLoc->getArg(NewIdx++); + Params.push_back(NewParam); + SemaRef.CurrentInstantiationScope->InstantiatedLocalPackArg(OldParam, + NewParam); + } + } + } + } else { + // The function type itself was not dependent and therefore no + // substitution occurred. However, we still need to instantiate + // the function parameters themselves. + TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens(); + if (FunctionProtoTypeLoc *OldProtoLoc + = dyn_cast<FunctionProtoTypeLoc>(&OldTL)) { + for (unsigned i = 0, i_end = OldProtoLoc->getNumArgs(); i != i_end; ++i) { + ParmVarDecl *Parm = VisitParmVarDecl(OldProtoLoc->getArg(i)); + if (!Parm) + return 0; + Params.push_back(Parm); + } + } + } + return NewTInfo; +} + +/// 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); + unsigned NumArgumentsInExpansion + = S.getNumArgumentsInExpansion(PatternParam->getType(), TemplateArgs); + 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().CPlusPlus0x); + + // The function has an exception specification or a "noreturn" + // attribute. Substitute into each of the exception types. + SmallVector<QualType, 4> Exceptions; + for (unsigned I = 0, N = Proto->getNumExceptions(); I != N; ++I) { + // FIXME: Poor location information! + if (const PackExpansionType *PackExpansion + = Proto->getExceptionType(I)->getAs<PackExpansionType>()) { + // We have a pack expansion. Instantiate it. + SmallVector<UnexpandedParameterPack, 2> Unexpanded; + SemaRef.collectUnexpandedParameterPacks(PackExpansion->getPattern(), + Unexpanded); + assert(!Unexpanded.empty() && + "Pack expansion without parameter packs?"); + + bool Expand = false; + bool RetainExpansion = false; + llvm::Optional<unsigned> NumExpansions + = PackExpansion->getNumExpansions(); + if (SemaRef.CheckParameterPacksForExpansion(New->getLocation(), + SourceRange(), + Unexpanded, + TemplateArgs, + Expand, + RetainExpansion, + NumExpansions)) + break; + + if (!Expand) { + // We can't expand this pack expansion into separate arguments yet; + // just substitute into the pattern and create a new pack expansion + // type. + Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1); + QualType T = SemaRef.SubstType(PackExpansion->getPattern(), + TemplateArgs, + New->getLocation(), New->getDeclName()); + if (T.isNull()) + break; + + T = SemaRef.Context.getPackExpansionType(T, NumExpansions); + Exceptions.push_back(T); + continue; + } + + // Substitute into the pack expansion pattern for each template + bool Invalid = false; + for (unsigned ArgIdx = 0; ArgIdx != *NumExpansions; ++ArgIdx) { + Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, ArgIdx); + + QualType T = SemaRef.SubstType(PackExpansion->getPattern(), + TemplateArgs, + New->getLocation(), New->getDeclName()); + if (T.isNull()) { + Invalid = true; + break; + } + + Exceptions.push_back(T); + } + + if (Invalid) + break; + + continue; + } + + QualType T + = SemaRef.SubstType(Proto->getExceptionType(I), TemplateArgs, + New->getLocation(), New->getDeclName()); + if (T.isNull() || + SemaRef.CheckSpecifiedExceptionType(T, New->getLocation())) + continue; + + Exceptions.push_back(T); + } + Expr *NoexceptExpr = 0; + if (Expr *OldNoexceptExpr = Proto->getNoexceptExpr()) { + EnterExpressionEvaluationContext Unevaluated(SemaRef, + Sema::ConstantEvaluated); + ExprResult E = SemaRef.SubstExpr(OldNoexceptExpr, TemplateArgs); + if (E.isUsable()) + E = SemaRef.CheckBooleanCondition(E.get(), E.get()->getLocStart()); + + if (E.isUsable()) { + NoexceptExpr = E.take(); + if (!NoexceptExpr->isTypeDependent() && + !NoexceptExpr->isValueDependent()) + NoexceptExpr = SemaRef.VerifyIntegerConstantExpression(NoexceptExpr, + 0, SemaRef.PDiag(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->arg_type_begin(), + NewProto->getNumArgs(), + 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) + 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->isDeletedAsWritten()) + New->setDeletedAsWritten(); + + // If we are performing substituting explicitly-specified template arguments + // or deduced template arguments into a function template and we reach this + // point, we are now past the point where SFINAE applies and have committed + // to keeping the new function template specialization. We therefore + // convert the active template instantiation for the function template + // into a template instantiation for this specific function template + // specialization, which is not a SFINAE context, so that we diagnose any + // further errors in the declaration itself. + typedef Sema::ActiveTemplateInstantiation ActiveInstType; + ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back(); + if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution || + ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) { + if (FunctionTemplateDecl *FunTmpl + = dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) { + assert(FunTmpl->getTemplatedDecl() == Tmpl && + "Deduction from the wrong function template?"); + (void) FunTmpl; + ActiveInst.Kind = ActiveInstType::TemplateInstantiation; + ActiveInst.Entity = reinterpret_cast<uintptr_t>(New); + --SemaRef.NonInstantiationEntries; + } + } + + const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>(); + assert(Proto && "Function template without prototype?"); + + if (Proto->hasExceptionSpec() || Proto->getNoReturnAttr()) { + FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); + + // DR1330: In C++11, defer instantiation of a non-trivial + // exception specification. + if (SemaRef.getLangOpts().CPlusPlus0x && + EPI.ExceptionSpecType != EST_None && + EPI.ExceptionSpecType != EST_DynamicNone && + EPI.ExceptionSpecType != EST_BasicNoexcept) { + FunctionDecl *ExceptionSpecTemplate = Tmpl; + if (EPI.ExceptionSpecType == EST_Uninstantiated) + ExceptionSpecTemplate = EPI.ExceptionSpecTemplate; + + // 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 = EST_Uninstantiated; + EPI.ExceptionSpecDecl = New; + EPI.ExceptionSpecTemplate = ExceptionSpecTemplate; + New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(), + NewProto->arg_type_begin(), + NewProto->getNumArgs(), + 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: attributes + // FIXME: New needs a pointer to Tmpl + return false; +} + +/// \brief Instantiate the definition of the given function from its +/// template. +/// +/// \param PointOfInstantiation the point at which the instantiation was +/// required. Note that this is not precisely a "point of instantiation" +/// for the function, but it's close. +/// +/// \param Function the already-instantiated declaration of a +/// function template specialization or member function of a class template +/// specialization. +/// +/// \param Recursive if true, recursively instantiates any functions that +/// are required by this instantiation. +/// +/// \param DefinitionRequired if true, then we are performing an explicit +/// instantiation where the body of the function is required. Complain if +/// there is no such body. +void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, + FunctionDecl *Function, + bool Recursive, + bool DefinitionRequired) { + if (Function->isInvalidDecl() || Function->isDefined()) + return; + + // Never instantiate an explicit specialization except if it is a class scope + // explicit specialization. + if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization && + !Function->getClassScopeSpecializationPattern()) + return; + + // Find the function body that we'll be substituting. + const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern(); + assert(PatternDecl && "instantiating a non-template"); + + Stmt *Pattern = PatternDecl->getBody(PatternDecl); + assert(PatternDecl && "template definition is not a template"); + if (!Pattern) { + // Try to find a defaulted definition + PatternDecl->isDefined(PatternDecl); + } + assert(PatternDecl && "template definition is not a template"); + + // Postpone late parsed template instantiations. + if (PatternDecl->isLateTemplateParsed() && + !LateTemplateParser) { + PendingInstantiations.push_back( + std::make_pair(Function, PointOfInstantiation)); + return; + } + + // Call the LateTemplateParser callback if there a need to late parse + // a templated function definition. + if (!Pattern && PatternDecl->isLateTemplateParsed() && + LateTemplateParser) { + LateTemplateParser(OpaqueParser, PatternDecl); + Pattern = PatternDecl->getBody(PatternDecl); + } + + if (!Pattern && !PatternDecl->isDefaulted()) { + if (DefinitionRequired) { + if (Function->getPrimaryTemplate()) + Diag(PointOfInstantiation, + diag::err_explicit_instantiation_undefined_func_template) + << Function->getPrimaryTemplate(); + else + Diag(PointOfInstantiation, + diag::err_explicit_instantiation_undefined_member) + << 1 << Function->getDeclName() << Function->getDeclContext(); + + if (PatternDecl) + Diag(PatternDecl->getLocation(), + diag::note_explicit_instantiation_here); + Function->setInvalidDecl(); + } else if (Function->getTemplateSpecializationKind() + == TSK_ExplicitInstantiationDefinition) { + PendingInstantiations.push_back( + std::make_pair(Function, PointOfInstantiation)); + } + + return; + } + + // C++0x [temp.explicit]p9: + // Except for inline functions, other explicit instantiation declarations + // have the effect of suppressing the implicit instantiation of the entity + // to which they refer. + if (Function->getTemplateSpecializationKind() + == TSK_ExplicitInstantiationDeclaration && + !PatternDecl->isInlined()) + return; + + InstantiatingTemplate Inst(*this, PointOfInstantiation, Function); + if (Inst) + return; + + // Copy the inner loc start from the pattern. + Function->setInnerLocStart(PatternDecl->getInnerLocStart()); + + // If we're performing recursive template instantiation, create our own + // queue of pending implicit instantiations that we will instantiate later, + // while we're still within our own instantiation context. + SmallVector<VTableUse, 16> SavedVTableUses; + std::deque<PendingImplicitInstantiation> SavedPendingInstantiations; + if (Recursive) { + VTableUses.swap(SavedVTableUses); + PendingInstantiations.swap(SavedPendingInstantiations); + } + + EnterExpressionEvaluationContext EvalContext(*this, + Sema::PotentiallyEvaluated); + ActOnStartOfFunctionDef(0, Function); + + // Introduce a new scope where local variable instantiations will be + // recorded, unless we're actually a member function within a local + // class, in which case we need to merge our results with the parent + // scope (of the enclosing function). + bool MergeWithParentScope = false; + if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Function->getDeclContext())) + MergeWithParentScope = Rec->isLocalClass(); + + LocalInstantiationScope Scope(*this, MergeWithParentScope); + + // 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 (PatternDecl->isDefaulted()) { + ActOnFinishFunctionBody(Function, 0, /*IsInstantiation=*/true); + + SetDeclDefaulted(Function, PatternDecl->getLocation()); + } else { + // 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); + } +} + +/// \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) { + if (Var->isInvalidDecl()) + return; + + // Find the out-of-line definition of this static data member. + VarDecl *Def = Var->getInstantiatedFromStaticDataMember(); + assert(Def && "This data member was not instantiated from a template?"); + assert(Def->isStaticDataMember() && "Not a static data member?"); + Def = Def->getOutOfLineDefinition(); + + if (!Def) { + // We did not find an out-of-line definition of this static data member, + // so 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 (DefinitionRequired) { + Def = Var->getInstantiatedFromStaticDataMember(); + Diag(PointOfInstantiation, + diag::err_explicit_instantiation_undefined_member) + << 2 << Var->getDeclName() << Var->getDeclContext(); + Diag(Def->getLocation(), diag::note_explicit_instantiation_here); + } 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++0x [temp.explicit]p9: + // Except for inline functions, other explicit instantiation declarations + // have the effect of suppressing the implicit instantiation of the entity + // to which they refer. + if (TSK == TSK_ExplicitInstantiationDeclaration) + return; + + Consumer.HandleCXXStaticMemberVarInstantiation(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) + 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); + } + + // 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; + Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(), + getTemplateInstantiationArgs(Var))); + + previousContext.pop(); + + if (Var) { + MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo(); + assert(MSInfo && "Missing member specialization information?"); + Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(), + MSInfo->getPointOfInstantiation()); + DeclGroupRef DG(Var); + Consumer.HandleTopLevelDecl(DG); + } + 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, " + "while instantiating static data member."); + VTableUses.swap(SavedVTableUses); + + // Restore the set of pending implicit instantiations. + assert(PendingInstantiations.empty() && + "PendingInstantiations should be empty before it is discarded, " + "while instantiating static data member."); + PendingInstantiations.swap(SavedPendingInstantiations); + } +} + +void +Sema::InstantiateMemInitializers(CXXConstructorDecl *New, + const CXXConstructorDecl *Tmpl, + const MultiLevelTemplateArgumentList &TemplateArgs) { + + SmallVector<CXXCtorInitializer*, 4> NewInits; + bool AnyErrors = false; + + // 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, 2> Unexpanded; + collectUnexpandedParameterPacks(BaseTL, Unexpanded); + bool ShouldExpand = false; + bool RetainExpansion = false; + llvm::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.data(), NewInits.size(), + AnyErrors); +} + +ExprResult Sema::SubstInitializer(Expr *Init, + const MultiLevelTemplateArgumentList &TemplateArgs, + bool CXXDirectInit) { + // Initializers are instantiated like expressions, except that various outer + // layers are stripped. + if (!Init) + return Owned(Init); + + if (ExprWithCleanups *ExprTemp = dyn_cast<ExprWithCleanups>(Init)) + Init = ExprTemp->getSubExpr(); + + while (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(Init)) + Init = Binder->getSubExpr(); + + if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Init)) + Init = ICE->getSubExprAsWritten(); + + // If this is a direct-initializer, we take apart CXXConstructExprs. + // Everything else is passed through. + CXXConstructExpr *Construct; + if (!CXXDirectInit || !(Construct = dyn_cast<CXXConstructExpr>(Init)) || + isa<CXXTemporaryObjectExpr>(Construct)) + return SubstExpr(Init, TemplateArgs); + + ASTOwningVector<Expr*> NewArgs(*this); + if (SubstExprs(Construct->getArgs(), Construct->getNumArgs(), true, + TemplateArgs, NewArgs)) + return ExprError(); + + // Treat an empty initializer like none. + if (NewArgs.empty()) + return Owned((Expr*)0); + + // Build a ParenListExpr to represent anything else. + // FIXME: Fake locations! + SourceLocation Loc = PP.getLocForEndOfToken(Init->getLocStart()); + return ActOnParenListExpr(Loc, Loc, move_arg(NewArgs)); +} + +// 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 X<int>::getKind(), we need to map the +/// EnumConstantDecl for KnownValue (which refers to +/// X<T>::<Kind>::KnownValue) to its instantiation +/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs +/// this mapping from within the instantiation of X<int>. +NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, + const MultiLevelTemplateArgumentList &TemplateArgs) { + DeclContext *ParentDC = D->getDeclContext(); + 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); + + unsigned PackIdx = ArgumentPackSubstitutionIndex; + return cast<NamedDecl>((*Found->get<DeclArgumentPack *>())[PackIdx]); + } + + // 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); + } + + 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.first, Found.second); + } 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<std::pair<ValueDecl *, SourceLocation>, 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 static data member definitions. + VarDecl *Var = cast<VarDecl>(Inst.first); + assert(Var->isStaticDataMember() && "Not a static data member?"); + + // 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, Var->getLocation(), + "instantiating static data member " + "definition"); + + bool DefinitionRequired = Var->getTemplateSpecializationKind() == + TSK_ExplicitInstantiationDefinition; + InstantiateStaticDataMemberDefinition(/*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; + } + } +} |