diff options
Diffstat (limited to 'contrib/llvm/tools/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp | 1403 |
1 files changed, 1125 insertions, 278 deletions
diff --git a/contrib/llvm/tools/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/contrib/llvm/tools/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp index d1428c5..5c28e3b 100644 --- a/contrib/llvm/tools/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp +++ b/contrib/llvm/tools/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp @@ -25,6 +25,17 @@ using namespace clang; +static bool isDeclWithinFunction(const Decl *D) { + const DeclContext *DC = D->getDeclContext(); + if (DC->isFunctionOrMethod()) + return true; + + if (DC->isRecord()) + return cast<CXXRecordDecl>(DC)->isLocalClass(); + + return false; +} + bool TemplateDeclInstantiator::SubstQualifier(const DeclaratorDecl *OldDecl, DeclaratorDecl *NewDecl) { if (!OldDecl->getQualifierLoc()) @@ -142,6 +153,13 @@ void Sema::InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs, Saved = CurrentInstantiationScope->cloneScopes(OuterMostScope); LateAttrs->push_back(LateInstantiatedAttribute(TmplAttr, Saved, New)); } else { + // Allow 'this' within late-parsed attributes. + NamedDecl *ND = dyn_cast<NamedDecl>(New); + CXXRecordDecl *ThisContext = + dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext()); + CXXThisScopeRAII ThisScope(*this, ThisContext, /*TypeQuals*/0, + ND && ND->isCXXInstanceMember()); + Attr *NewAttr = sema::instantiateTemplateAttribute(TmplAttr, Context, *this, TemplateArgs); if (NewAttr) @@ -247,7 +265,7 @@ Decl *TemplateDeclInstantiator::InstantiateTypedefNameDecl(TypedefNameDecl *D, // If the typedef types are not identical, reject them. SemaRef.isIncompatibleTypedef(InstPrevTypedef, Typedef); - Typedef->setPreviousDeclaration(InstPrevTypedef); + Typedef->setPreviousDecl(InstPrevTypedef); } SemaRef.InstantiateAttrs(TemplateArgs, D, Typedef); @@ -299,7 +317,7 @@ TemplateDeclInstantiator::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) { = TypeAliasTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(), D->getDeclName(), InstParams, AliasInst); if (PrevAliasTemplate) - Inst->setPreviousDeclaration(PrevAliasTemplate); + Inst->setPreviousDecl(PrevAliasTemplate); Inst->setAccess(D->getAccess()); @@ -312,6 +330,12 @@ TemplateDeclInstantiator::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) { } Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { + return VisitVarDecl(D, /*InstantiatingVarTemplate=*/false); +} + +Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D, + bool InstantiatingVarTemplate) { + // If this is the variable for an anonymous struct or union, // instantiate the anonymous struct/union type first. if (const RecordType *RecordTy = D->getType()->getAs<RecordType>()) @@ -333,105 +357,26 @@ Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { return 0; } - // Build the instantiated declaration - VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner, - D->getInnerLocStart(), - D->getLocation(), D->getIdentifier(), - DI->getType(), DI, - D->getStorageClass()); - Var->setTSCSpec(D->getTSCSpec()); - 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()); - } - - SemaRef.InstantiateAttrs(TemplateArgs, D, Var, LateAttrs, StartingScope); + DeclContext *DC = Owner; + if (D->isLocalExternDecl()) + SemaRef.adjustContextForLocalExternDecl(DC); - if (Var->hasAttrs()) - SemaRef.CheckAlignasUnderalignment(Var); + // Build the instantiated declaration. + VarDecl *Var = VarDecl::Create(SemaRef.Context, DC, D->getInnerLocStart(), + D->getLocation(), D->getIdentifier(), + DI->getType(), DI, D->getStorageClass()); - // 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); - } - - // 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, D); - else - SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated, D); - - // 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); + // Substitute the nested name specifier, if any. + if (SubstQualifier(D, Var)) + return 0; + SemaRef.BuildVariableInstantiation(Var, D, TemplateArgs, LateAttrs, Owner, + StartingScope, InstantiatingVarTemplate); return Var; } @@ -723,19 +668,17 @@ Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) { } } - 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())) + // + // DR1484 clarifies that enumeration definitions inside of a template + // declaration aren't considered entities that can be separately instantiated + // from the rest of the entity they are declared inside of. + if (isDeclWithinFunction(D) ? D == Def : Def && !Enum->isScoped()) { + SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Enum); InstantiateEnumDefinition(Enum, Def); + } return Enum; } @@ -953,7 +896,7 @@ Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) { else Inst->setAccess(D->getAccess()); - Inst->setObjectOfFriendDecl(PrevClassTemplate != 0); + Inst->setObjectOfFriendDecl(); // TODO: do we want to track the instantiation progeny of this // friend target decl? } else { @@ -988,7 +931,7 @@ Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) { SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; D->getPartialSpecializations(PartialSpecs); for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) - if (PartialSpecs[I]->isOutOfLine()) + if (PartialSpecs[I]->getFirstDecl()->isOutOfLine()) OutOfLinePartialSpecs.push_back(std::make_pair(Inst, PartialSpecs[I])); } @@ -1019,6 +962,85 @@ TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl( return InstantiateClassTemplatePartialSpecialization(InstClassTemplate, D); } +Decl *TemplateDeclInstantiator::VisitVarTemplateDecl(VarTemplateDecl *D) { + assert(D->getTemplatedDecl()->isStaticDataMember() && + "Only static data member templates are allowed."); + + // Create a local instantiation scope for this variable template, which + // will contain the instantiations of the template parameters. + LocalInstantiationScope Scope(SemaRef); + TemplateParameterList *TempParams = D->getTemplateParameters(); + TemplateParameterList *InstParams = SubstTemplateParams(TempParams); + if (!InstParams) + return NULL; + + VarDecl *Pattern = D->getTemplatedDecl(); + VarTemplateDecl *PrevVarTemplate = 0; + + if (Pattern->getPreviousDecl()) { + DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName()); + if (!Found.empty()) + PrevVarTemplate = dyn_cast<VarTemplateDecl>(Found.front()); + } + + VarDecl *VarInst = + cast_or_null<VarDecl>(VisitVarDecl(Pattern, + /*InstantiatingVarTemplate=*/true)); + + DeclContext *DC = Owner; + + VarTemplateDecl *Inst = VarTemplateDecl::Create( + SemaRef.Context, DC, D->getLocation(), D->getIdentifier(), InstParams, + VarInst, PrevVarTemplate); + VarInst->setDescribedVarTemplate(Inst); + + Inst->setAccess(D->getAccess()); + if (!PrevVarTemplate) + Inst->setInstantiatedFromMemberTemplate(D); + + if (D->isOutOfLine()) { + Inst->setLexicalDeclContext(D->getLexicalDeclContext()); + VarInst->setLexicalDeclContext(D->getLexicalDeclContext()); + } + + Owner->addDecl(Inst); + + if (!PrevVarTemplate) { + // Queue up any out-of-line partial specializations of this member + // variable template; the client will force their instantiation once + // the enclosing class has been instantiated. + SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs; + D->getPartialSpecializations(PartialSpecs); + for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) + if (PartialSpecs[I]->getFirstDecl()->isOutOfLine()) + OutOfLineVarPartialSpecs.push_back( + std::make_pair(Inst, PartialSpecs[I])); + } + + return Inst; +} + +Decl *TemplateDeclInstantiator::VisitVarTemplatePartialSpecializationDecl( + VarTemplatePartialSpecializationDecl *D) { + assert(D->isStaticDataMember() && + "Only static data member templates are allowed."); + + VarTemplateDecl *VarTemplate = D->getSpecializedTemplate(); + + // Lookup the already-instantiated declaration and return that. + DeclContext::lookup_result Found = Owner->lookup(VarTemplate->getDeclName()); + assert(!Found.empty() && "Instantiation found nothing?"); + + VarTemplateDecl *InstVarTemplate = dyn_cast<VarTemplateDecl>(Found.front()); + assert(InstVarTemplate && "Instantiation did not find a variable template?"); + + if (VarTemplatePartialSpecializationDecl *Result = + InstVarTemplate->findPartialSpecInstantiatedFromMember(D)) + return Result; + + return InstantiateVarTemplatePartialSpecialization(InstVarTemplate, D); +} + Decl * TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) { // Create a local instantiation scope for this function template, which @@ -1103,17 +1125,30 @@ Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) { // 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); + if (D->getFriendObjectKind()) + Record->setObjectOfFriendDecl(); // Make sure that anonymous structs and unions are recorded. - if (D->isAnonymousStructOrUnion()) { + if (D->isAnonymousStructOrUnion()) Record->setAnonymousStructOrUnion(true); - if (Record->getDeclContext()->getRedeclContext()->isFunctionOrMethod()) - SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Record); - } + + if (D->isLocalClass()) + SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Record); Owner->addDecl(Record); + + // DR1484 clarifies that the members of a local class are instantiated as part + // of the instantiation of their enclosing entity. + if (D->isCompleteDefinition() && D->isLocalClass()) { + if (SemaRef.InstantiateClass(D->getLocation(), Record, D, TemplateArgs, + TSK_ImplicitInstantiation, + /*Complain=*/true)) { + llvm_unreachable("InstantiateClass shouldn't fail here!"); + } else { + SemaRef.InstantiateClassMembers(D->getLocation(), Record, TemplateArgs, + TSK_ImplicitInstantiation); + } + } return Record; } @@ -1136,9 +1171,7 @@ static QualType adjustFunctionTypeForInstantiation(ASTContext &Context, FunctionProtoType::ExtProtoInfo NewEPI = NewFunc->getExtProtoInfo(); NewEPI.ExtInfo = OrigFunc->getExtInfo(); return Context.getFunctionType(NewFunc->getResultType(), - ArrayRef<QualType>(NewFunc->arg_type_begin(), - NewFunc->getNumArgs()), - NewEPI); + NewFunc->getArgTypes(), NewEPI); } /// Normal class members are of more specific types and therefore @@ -1191,11 +1224,13 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, } // If we're instantiating a local function declaration, put the result - // in the owner; otherwise we need to find the instantiated context. + // in the enclosing namespace; otherwise we need to find the instantiated + // context. DeclContext *DC; - if (D->getDeclContext()->isFunctionOrMethod()) + if (D->isLocalExternDecl()) { DC = Owner; - else if (isFriend && QualifierLoc) { + SemaRef.adjustContextForLocalExternDecl(DC); + } else if (isFriend && QualifierLoc) { CXXScopeSpec SS; SS.Adopt(QualifierLoc); DC = SemaRef.computeDeclContext(SS); @@ -1211,6 +1246,7 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, D->getCanonicalDecl()->getStorageClass(), D->isInlineSpecified(), D->hasWrittenPrototype(), D->isConstexpr()); + Function->setRangeEnd(D->getSourceRange().getEnd()); if (D->isInlined()) Function->setImplicitlyInline(); @@ -1218,8 +1254,11 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, if (QualifierLoc) Function->setQualifierInfo(QualifierLoc); + if (D->isLocalExternDecl()) + Function->setLocalExternDecl(); + DeclContext *LexicalDC = Owner; - if (!isFriend && D->isOutOfLine()) { + if (!isFriend && D->isOutOfLine() && !D->isLocalExternDecl()) { assert(D->getDeclContext()->isFileContext()); LexicalDC = D->getDeclContext(); } @@ -1227,26 +1266,9 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, 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); - } - } + for (unsigned P = 0; P < Params.size(); ++P) + if (Params[P]) + Params[P]->setOwningFunction(Function); Function->setParams(Params); SourceLocation InstantiateAtPOI; @@ -1302,15 +1324,18 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, bool isExplicitSpecialization = false; - LookupResult Previous(SemaRef, Function->getDeclName(), SourceLocation(), - Sema::LookupOrdinaryName, Sema::ForRedeclaration); + LookupResult Previous( + SemaRef, Function->getDeclName(), SourceLocation(), + D->isLocalExternDecl() ? Sema::LookupRedeclarationWithLinkage + : Sema::LookupOrdinaryName, + Sema::ForRedeclaration); if (DependentFunctionTemplateSpecializationInfo *Info = D->getDependentSpecializationInfo()) { assert(isFriend && "non-friend has dependent specialization info?"); // This needs to be set now for future sanity. - Function->setObjectOfFriendDecl(/*HasPrevious*/ true); + Function->setObjectOfFriendDecl(); // Instantiate the explicit template arguments. TemplateArgumentListInfo ExplicitArgs(Info->getLAngleLoc(), @@ -1360,13 +1385,7 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, // 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); + PrincipalDecl->setObjectOfFriendDecl(); DC->makeDeclVisibleInContext(PrincipalDecl); bool queuedInstantiation = false; @@ -1441,6 +1460,9 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, } } + if (Function->isLocalExternDecl() && !Function->getPreviousDecl()) + DC->makeDeclVisibleInContext(PrincipalDecl); + if (Function->isOverloadedOperator() && !DC->isRecord() && PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) PrincipalDecl->setNonMemberOperator(); @@ -1502,24 +1524,6 @@ TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, return 0; QualType T = adjustFunctionTypeForInstantiation(SemaRef.Context, D, TInfo); - // \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, @@ -1572,7 +1576,7 @@ TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, "inheriting constructor template in dependent context?"); Sema::InstantiatingTemplate Inst(SemaRef, Constructor->getLocation(), Inh); - if (Inst) + if (Inst.isInvalid()) return 0; Sema::ContextRAII SavedContext(SemaRef, Inh->getDeclContext()); LocalInstantiationScope LocalScope(SemaRef); @@ -1634,7 +1638,7 @@ TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, TemplateParams, Method); if (isFriend) { FunctionTemplate->setLexicalDeclContext(Owner); - FunctionTemplate->setObjectOfFriendDecl(true); + FunctionTemplate->setObjectOfFriendDecl(); } else if (D->isOutOfLine()) FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); Method->setDescribedFunctionTemplate(FunctionTemplate); @@ -1661,7 +1665,7 @@ TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, TempParamLists.data()); Method->setLexicalDeclContext(Owner); - Method->setObjectOfFriendDecl(true); + Method->setObjectOfFriendDecl(); } else if (D->isOutOfLine()) Method->setLexicalDeclContext(D->getLexicalDeclContext()); @@ -1750,7 +1754,7 @@ Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) { return VisitCXXMethodDecl(D); } -ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { +Decl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { return SemaRef.SubstParmVarDecl(D, TemplateArgs, /*indexAdjustment*/ 0, None, /*ExpectParameterPack=*/ false); } @@ -1769,8 +1773,13 @@ Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl( D->isParameterPack()); Inst->setAccess(AS_public); - if (D->hasDefaultArgument()) - Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false); + if (D->hasDefaultArgument()) { + TypeSourceInfo *InstantiatedDefaultArg = + SemaRef.SubstType(D->getDefaultArgumentInfo(), TemplateArgs, + D->getDefaultArgumentLoc(), D->getDeclName()); + if (InstantiatedDefaultArg) + Inst->setDefaultArgument(InstantiatedDefaultArg, false); + } // Introduce this template parameter's instantiation into the instantiation // scope. @@ -1920,7 +1929,11 @@ Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl( if (Invalid) Param->setInvalidDecl(); - Param->setDefaultArgument(D->getDefaultArgument(), false); + if (D->hasDefaultArgument()) { + ExprResult Value = SemaRef.SubstExpr(D->getDefaultArgument(), TemplateArgs); + if (!Value.isInvalid()) + Param->setDefaultArgument(Value.get(), false); + } // Introduce this template parameter's instantiation into the instantiation // scope. @@ -2043,7 +2056,21 @@ TemplateDeclInstantiator::VisitTemplateTemplateParmDecl( D->getPosition(), D->isParameterPack(), D->getIdentifier(), InstParams); - Param->setDefaultArgument(D->getDefaultArgument(), false); + if (D->hasDefaultArgument()) { + NestedNameSpecifierLoc QualifierLoc = + D->getDefaultArgument().getTemplateQualifierLoc(); + QualifierLoc = + SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgs); + TemplateName TName = SemaRef.SubstTemplateName( + QualifierLoc, D->getDefaultArgument().getArgument().getAsTemplate(), + D->getDefaultArgument().getTemplateNameLoc(), TemplateArgs); + if (!TName.isNull()) + Param->setDefaultArgument( + TemplateArgumentLoc(TemplateArgument(TName), + D->getDefaultArgument().getTemplateQualifierLoc(), + D->getDefaultArgument().getTemplateNameLoc()), + false); + } Param->setAccess(AS_public); // Introduce this template parameter's instantiation into the instantiation @@ -2102,10 +2129,10 @@ Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) { Sema::ForRedeclaration); UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner, - D->getUsingLocation(), + D->getUsingLoc(), QualifierLoc, NameInfo, - D->isTypeName()); + D->hasTypename()); CXXScopeSpec SS; SS.Adopt(QualifierLoc); @@ -2114,15 +2141,15 @@ Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) { SemaRef.LookupQualifiedName(Prev, Owner); // Check for invalid redeclarations. - if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(), - D->isTypeName(), SS, + if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLoc(), + D->hasTypename(), SS, D->getLocation(), Prev)) NewUD->setInvalidDecl(); } if (!NewUD->isInvalidDecl() && - SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS, + SemaRef.CheckUsingDeclQualifier(D->getUsingLoc(), SS, D->getLocation())) NewUD->setInvalidDecl(); @@ -2147,19 +2174,22 @@ Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) { I != E; ++I) { UsingShadowDecl *Shadow = *I; NamedDecl *InstTarget = - cast_or_null<NamedDecl>(SemaRef.FindInstantiatedDecl( - Shadow->getLocation(), - Shadow->getTargetDecl(), - TemplateArgs)); + cast_or_null<NamedDecl>(SemaRef.FindInstantiatedDecl( + Shadow->getLocation(), Shadow->getTargetDecl(), TemplateArgs)); if (!InstTarget) return 0; - if (CheckRedeclaration && - SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev)) - continue; + UsingShadowDecl *PrevDecl = 0; + if (CheckRedeclaration) { + if (SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev, PrevDecl)) + continue; + } else if (UsingShadowDecl *OldPrev = Shadow->getPreviousDecl()) { + PrevDecl = cast_or_null<UsingShadowDecl>(SemaRef.FindInstantiatedDecl( + Shadow->getLocation(), OldPrev, TemplateArgs)); + } - UsingShadowDecl *InstShadow - = SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget); + UsingShadowDecl *InstShadow = + SemaRef.BuildUsingShadowDecl(/*Scope*/0, NewUD, InstTarget, PrevDecl); SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow); if (isFunctionScope) @@ -2257,13 +2287,13 @@ Decl *TemplateDeclInstantiator::VisitClassScopeFunctionSpecializationDecl( Decl *TemplateDeclInstantiator::VisitOMPThreadPrivateDecl( OMPThreadPrivateDecl *D) { - SmallVector<DeclRefExpr *, 5> Vars; - for (ArrayRef<DeclRefExpr *>::iterator I = D->varlist_begin(), - E = D->varlist_end(); + SmallVector<Expr *, 5> Vars; + for (ArrayRef<Expr *>::iterator I = D->varlist_begin(), + E = D->varlist_end(); I != E; ++I) { Expr *Var = SemaRef.SubstExpr(*I, TemplateArgs).take(); assert(isa<DeclRefExpr>(Var) && "threadprivate arg is not a DeclRefExpr"); - Vars.push_back(cast<DeclRefExpr>(Var)); + Vars.push_back(Var); } OMPThreadPrivateDecl *TD = @@ -2272,6 +2302,262 @@ Decl *TemplateDeclInstantiator::VisitOMPThreadPrivateDecl( return TD; } +Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D) { + return VisitFunctionDecl(D, 0); +} + +Decl *TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D) { + return VisitCXXMethodDecl(D, 0); +} + +Decl *TemplateDeclInstantiator::VisitRecordDecl(RecordDecl *D) { + llvm_unreachable("There are only CXXRecordDecls in C++"); +} + +Decl * +TemplateDeclInstantiator::VisitClassTemplateSpecializationDecl( + ClassTemplateSpecializationDecl *D) { + // As a MS extension, we permit class-scope explicit specialization + // of member class templates. + ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate(); + assert(ClassTemplate->getDeclContext()->isRecord() && + D->getTemplateSpecializationKind() == TSK_ExplicitSpecialization && + "can only instantiate an explicit specialization " + "for a member class template"); + + // Lookup the already-instantiated declaration in the instantiation + // of the class template. FIXME: Diagnose or assert if this fails? + DeclContext::lookup_result Found + = Owner->lookup(ClassTemplate->getDeclName()); + if (Found.empty()) + return 0; + ClassTemplateDecl *InstClassTemplate + = dyn_cast<ClassTemplateDecl>(Found.front()); + if (!InstClassTemplate) + return 0; + + // Substitute into the template arguments of the class template explicit + // specialization. + TemplateSpecializationTypeLoc Loc = D->getTypeAsWritten()->getTypeLoc(). + castAs<TemplateSpecializationTypeLoc>(); + TemplateArgumentListInfo InstTemplateArgs(Loc.getLAngleLoc(), + Loc.getRAngleLoc()); + SmallVector<TemplateArgumentLoc, 4> ArgLocs; + for (unsigned I = 0; I != Loc.getNumArgs(); ++I) + ArgLocs.push_back(Loc.getArgLoc(I)); + if (SemaRef.Subst(ArgLocs.data(), ArgLocs.size(), + InstTemplateArgs, TemplateArgs)) + return 0; + + // Check that the template argument list is well-formed for this + // class template. + SmallVector<TemplateArgument, 4> Converted; + if (SemaRef.CheckTemplateArgumentList(InstClassTemplate, + D->getLocation(), + InstTemplateArgs, + false, + Converted)) + return 0; + + // Figure out where to insert this class template explicit specialization + // in the member template's set of class template explicit specializations. + void *InsertPos = 0; + ClassTemplateSpecializationDecl *PrevDecl = + InstClassTemplate->findSpecialization(Converted.data(), Converted.size(), + InsertPos); + + // Check whether we've already seen a conflicting instantiation of this + // declaration (for instance, if there was a prior implicit instantiation). + bool Ignored; + if (PrevDecl && + SemaRef.CheckSpecializationInstantiationRedecl(D->getLocation(), + D->getSpecializationKind(), + PrevDecl, + PrevDecl->getSpecializationKind(), + PrevDecl->getPointOfInstantiation(), + Ignored)) + return 0; + + // If PrevDecl was a definition and D is also a definition, diagnose. + // This happens in cases like: + // + // template<typename T, typename U> + // struct Outer { + // template<typename X> struct Inner; + // template<> struct Inner<T> {}; + // template<> struct Inner<U> {}; + // }; + // + // Outer<int, int> outer; // error: the explicit specializations of Inner + // // have the same signature. + if (PrevDecl && PrevDecl->getDefinition() && + D->isThisDeclarationADefinition()) { + SemaRef.Diag(D->getLocation(), diag::err_redefinition) << PrevDecl; + SemaRef.Diag(PrevDecl->getDefinition()->getLocation(), + diag::note_previous_definition); + return 0; + } + + // Create the class template partial specialization declaration. + ClassTemplateSpecializationDecl *InstD + = ClassTemplateSpecializationDecl::Create(SemaRef.Context, + D->getTagKind(), + Owner, + D->getLocStart(), + D->getLocation(), + InstClassTemplate, + Converted.data(), + Converted.size(), + PrevDecl); + + // Add this partial specialization to the set of class template partial + // specializations. + if (!PrevDecl) + InstClassTemplate->AddSpecialization(InstD, InsertPos); + + // Substitute the nested name specifier, if any. + if (SubstQualifier(D, InstD)) + return 0; + + // Build the canonical type that describes the converted template + // arguments of the class template explicit specialization. + QualType CanonType = SemaRef.Context.getTemplateSpecializationType( + TemplateName(InstClassTemplate), Converted.data(), Converted.size(), + SemaRef.Context.getRecordType(InstD)); + + // Build the fully-sugared type for this class template + // specialization as the user wrote in the specialization + // itself. This means that we'll pretty-print the type retrieved + // from the specialization's declaration the way that the user + // actually wrote the specialization, rather than formatting the + // name based on the "canonical" representation used to store the + // template arguments in the specialization. + TypeSourceInfo *WrittenTy = SemaRef.Context.getTemplateSpecializationTypeInfo( + TemplateName(InstClassTemplate), D->getLocation(), InstTemplateArgs, + CanonType); + + InstD->setAccess(D->getAccess()); + InstD->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation); + InstD->setSpecializationKind(D->getSpecializationKind()); + InstD->setTypeAsWritten(WrittenTy); + InstD->setExternLoc(D->getExternLoc()); + InstD->setTemplateKeywordLoc(D->getTemplateKeywordLoc()); + + Owner->addDecl(InstD); + + // Instantiate the members of the class-scope explicit specialization eagerly. + // We don't have support for lazy instantiation of an explicit specialization + // yet, and MSVC eagerly instantiates in this case. + if (D->isThisDeclarationADefinition() && + SemaRef.InstantiateClass(D->getLocation(), InstD, D, TemplateArgs, + TSK_ImplicitInstantiation, + /*Complain=*/true)) + return 0; + + return InstD; +} + +Decl *TemplateDeclInstantiator::VisitVarTemplateSpecializationDecl( + VarTemplateSpecializationDecl *D) { + + TemplateArgumentListInfo VarTemplateArgsInfo; + VarTemplateDecl *VarTemplate = D->getSpecializedTemplate(); + assert(VarTemplate && + "A template specialization without specialized template?"); + + // Substitute the current template arguments. + const TemplateArgumentListInfo &TemplateArgsInfo = D->getTemplateArgsInfo(); + VarTemplateArgsInfo.setLAngleLoc(TemplateArgsInfo.getLAngleLoc()); + VarTemplateArgsInfo.setRAngleLoc(TemplateArgsInfo.getRAngleLoc()); + + if (SemaRef.Subst(TemplateArgsInfo.getArgumentArray(), + TemplateArgsInfo.size(), VarTemplateArgsInfo, TemplateArgs)) + return 0; + + // Check that the template argument list is well-formed for this template. + SmallVector<TemplateArgument, 4> Converted; + bool ExpansionIntoFixedList = false; + if (SemaRef.CheckTemplateArgumentList( + VarTemplate, VarTemplate->getLocStart(), + const_cast<TemplateArgumentListInfo &>(VarTemplateArgsInfo), false, + Converted, &ExpansionIntoFixedList)) + return 0; + + // Find the variable template specialization declaration that + // corresponds to these arguments. + void *InsertPos = 0; + if (VarTemplateSpecializationDecl *VarSpec = VarTemplate->findSpecialization( + Converted.data(), Converted.size(), InsertPos)) + // If we already have a variable template specialization, return it. + return VarSpec; + + return VisitVarTemplateSpecializationDecl(VarTemplate, D, InsertPos, + VarTemplateArgsInfo, Converted); +} + +Decl *TemplateDeclInstantiator::VisitVarTemplateSpecializationDecl( + VarTemplateDecl *VarTemplate, VarDecl *D, void *InsertPos, + const TemplateArgumentListInfo &TemplateArgsInfo, + llvm::ArrayRef<TemplateArgument> Converted) { + + // If this is the variable for an anonymous struct or union, + // instantiate the anonymous struct/union type first. + if (const RecordType *RecordTy = D->getType()->getAs<RecordType>()) + if (RecordTy->getDecl()->isAnonymousStructOrUnion()) + if (!VisitCXXRecordDecl(cast<CXXRecordDecl>(RecordTy->getDecl()))) + return 0; + + // Do substitution on the type of the declaration + TypeSourceInfo *DI = + SemaRef.SubstType(D->getTypeSourceInfo(), TemplateArgs, + D->getTypeSpecStartLoc(), D->getDeclName()); + if (!DI) + return 0; + + if (DI->getType()->isFunctionType()) { + SemaRef.Diag(D->getLocation(), diag::err_variable_instantiates_to_function) + << D->isStaticDataMember() << DI->getType(); + return 0; + } + + // Build the instantiated declaration + VarTemplateSpecializationDecl *Var = VarTemplateSpecializationDecl::Create( + SemaRef.Context, Owner, D->getInnerLocStart(), D->getLocation(), + VarTemplate, DI->getType(), DI, D->getStorageClass(), Converted.data(), + Converted.size()); + Var->setTemplateArgsInfo(TemplateArgsInfo); + if (InsertPos) + VarTemplate->AddSpecialization(Var, InsertPos); + + // Substitute the nested name specifier, if any. + if (SubstQualifier(D, Var)) + return 0; + + SemaRef.BuildVariableInstantiation(Var, D, TemplateArgs, LateAttrs, + Owner, StartingScope); + + return Var; +} + +Decl *TemplateDeclInstantiator::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) { + llvm_unreachable("@defs is not supported in Objective-C++"); +} + +Decl *TemplateDeclInstantiator::VisitFriendTemplateDecl(FriendTemplateDecl *D) { + // FIXME: We need to be able to instantiate FriendTemplateDecls. + unsigned DiagID = SemaRef.getDiagnostics().getCustomDiagID( + DiagnosticsEngine::Error, + "cannot instantiate %0 yet"); + SemaRef.Diag(D->getLocation(), DiagID) + << D->getDeclKindName(); + + return 0; +} + +Decl *TemplateDeclInstantiator::VisitDecl(Decl *D) { + llvm_unreachable("Unexpected decl"); +} + Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner, const MultiLevelTemplateArgumentList &TemplateArgs) { TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs); @@ -2343,9 +2629,12 @@ TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization( // Substitute into the template arguments of the class template partial // specialization. - TemplateArgumentListInfo InstTemplateArgs; // no angle locations - if (SemaRef.Subst(PartialSpec->getTemplateArgsAsWritten(), - PartialSpec->getNumTemplateArgsAsWritten(), + const ASTTemplateArgumentListInfo *TemplArgInfo + = PartialSpec->getTemplateArgsAsWritten(); + TemplateArgumentListInfo InstTemplateArgs(TemplArgInfo->LAngleLoc, + TemplArgInfo->RAngleLoc); + if (SemaRef.Subst(TemplArgInfo->getTemplateArgs(), + TemplArgInfo->NumTemplateArgs, InstTemplateArgs, TemplateArgs)) return 0; @@ -2424,8 +2713,7 @@ TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization( Converted.size(), InstTemplateArgs, CanonType, - 0, - ClassTemplate->getNextPartialSpecSequenceNumber()); + 0); // Substitute the nested name specifier, if any. if (SubstQualifier(PartialSpec, InstPartialSpec)) return 0; @@ -2439,6 +2727,137 @@ TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization( return InstPartialSpec; } +/// \brief Instantiate the declaration of a variable template partial +/// specialization. +/// +/// \param VarTemplate the (instantiated) variable template that is partially +/// specialized by the instantiation of \p PartialSpec. +/// +/// \param PartialSpec the (uninstantiated) variable template partial +/// specialization that we are instantiating. +/// +/// \returns The instantiated partial specialization, if successful; otherwise, +/// NULL to indicate an error. +VarTemplatePartialSpecializationDecl * +TemplateDeclInstantiator::InstantiateVarTemplatePartialSpecialization( + VarTemplateDecl *VarTemplate, + VarTemplatePartialSpecializationDecl *PartialSpec) { + // Create a local instantiation scope for this variable template partial + // specialization, which will contain the instantiations of the template + // parameters. + LocalInstantiationScope Scope(SemaRef); + + // Substitute into the template parameters of the variable template partial + // specialization. + TemplateParameterList *TempParams = PartialSpec->getTemplateParameters(); + TemplateParameterList *InstParams = SubstTemplateParams(TempParams); + if (!InstParams) + return 0; + + // Substitute into the template arguments of the variable template partial + // specialization. + const ASTTemplateArgumentListInfo *TemplArgInfo + = PartialSpec->getTemplateArgsAsWritten(); + TemplateArgumentListInfo InstTemplateArgs(TemplArgInfo->LAngleLoc, + TemplArgInfo->RAngleLoc); + if (SemaRef.Subst(TemplArgInfo->getTemplateArgs(), + TemplArgInfo->NumTemplateArgs, + InstTemplateArgs, TemplateArgs)) + return 0; + + // Check that the template argument list is well-formed for this + // class template. + SmallVector<TemplateArgument, 4> Converted; + if (SemaRef.CheckTemplateArgumentList(VarTemplate, PartialSpec->getLocation(), + InstTemplateArgs, false, Converted)) + return 0; + + // Figure out where to insert this variable template partial specialization + // in the member template's set of variable template partial specializations. + void *InsertPos = 0; + VarTemplateSpecializationDecl *PrevDecl = + VarTemplate->findPartialSpecialization(Converted.data(), Converted.size(), + InsertPos); + + // Build the canonical type that describes the converted template + // arguments of the variable template partial specialization. + QualType CanonType = SemaRef.Context.getTemplateSpecializationType( + TemplateName(VarTemplate), Converted.data(), Converted.size()); + + // Build the fully-sugared type for this variable template + // specialization as the user wrote in the specialization + // itself. This means that we'll pretty-print the type retrieved + // from the specialization's declaration the way that the user + // actually wrote the specialization, rather than formatting the + // name based on the "canonical" representation used to store the + // template arguments in the specialization. + TypeSourceInfo *WrittenTy = SemaRef.Context.getTemplateSpecializationTypeInfo( + TemplateName(VarTemplate), PartialSpec->getLocation(), InstTemplateArgs, + CanonType); + + if (PrevDecl) { + // We've already seen a partial specialization with the same template + // parameters and template arguments. This can happen, for example, when + // substituting the outer template arguments ends up causing two + // variable template partial specializations of a member variable template + // to have identical forms, e.g., + // + // template<typename T, typename U> + // struct Outer { + // template<typename X, typename Y> pair<X,Y> p; + // template<typename Y> pair<T, Y> p; + // template<typename Y> pair<U, Y> p; + // }; + // + // Outer<int, int> outer; // error: the partial specializations of Inner + // // have the same signature. + SemaRef.Diag(PartialSpec->getLocation(), + diag::err_var_partial_spec_redeclared) + << WrittenTy->getType(); + SemaRef.Diag(PrevDecl->getLocation(), + diag::note_var_prev_partial_spec_here); + return 0; + } + + // Do substitution on the type of the declaration + TypeSourceInfo *DI = SemaRef.SubstType( + PartialSpec->getTypeSourceInfo(), TemplateArgs, + PartialSpec->getTypeSpecStartLoc(), PartialSpec->getDeclName()); + if (!DI) + return 0; + + if (DI->getType()->isFunctionType()) { + SemaRef.Diag(PartialSpec->getLocation(), + diag::err_variable_instantiates_to_function) + << PartialSpec->isStaticDataMember() << DI->getType(); + return 0; + } + + // Create the variable template partial specialization declaration. + VarTemplatePartialSpecializationDecl *InstPartialSpec = + VarTemplatePartialSpecializationDecl::Create( + SemaRef.Context, Owner, PartialSpec->getInnerLocStart(), + PartialSpec->getLocation(), InstParams, VarTemplate, DI->getType(), + DI, PartialSpec->getStorageClass(), Converted.data(), + Converted.size(), InstTemplateArgs); + + // Substitute the nested name specifier, if any. + if (SubstQualifier(PartialSpec, InstPartialSpec)) + return 0; + + InstPartialSpec->setInstantiatedFromMember(PartialSpec); + InstPartialSpec->setTypeAsWritten(WrittenTy); + + // Add this partial specialization to the set of variable template partial + // specializations. The instantiation of the initializer is not necessary. + VarTemplate->AddPartialSpecialization(InstPartialSpec, /*InsertPos=*/0); + + SemaRef.BuildVariableInstantiation(InstPartialSpec, PartialSpec, TemplateArgs, + LateAttrs, Owner, StartingScope); + + return InstPartialSpec; +} + TypeSourceInfo* TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, SmallVectorImpl<ParmVarDecl *> &Params) { @@ -2449,7 +2868,7 @@ TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, CXXRecordDecl *ThisContext = 0; unsigned ThisTypeQuals = 0; if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { - ThisContext = Method->getParent(); + ThisContext = cast<CXXRecordDecl>(Owner); ThisTypeQuals = Method->getTypeQualifiers(); } @@ -2461,11 +2880,10 @@ TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, if (!NewTInfo) return 0; - if (NewTInfo != OldTInfo) { - // Get parameters from the new type info. - TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens(); - if (FunctionProtoTypeLoc OldProtoLoc = - OldTL.getAs<FunctionProtoTypeLoc>()) { + TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens(); + if (FunctionProtoTypeLoc OldProtoLoc = OldTL.getAs<FunctionProtoTypeLoc>()) { + if (NewTInfo != OldTInfo) { + // Get parameters from the new type info. TypeLoc NewTL = NewTInfo->getTypeLoc().IgnoreParens(); FunctionProtoTypeLoc NewProtoLoc = NewTL.castAs<FunctionProtoTypeLoc>(); unsigned NewIdx = 0; @@ -2495,22 +2913,45 @@ TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, } } } - } - } 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 = - OldTL.getAs<FunctionProtoTypeLoc>()) { + } else { + // The function type itself was not dependent and therefore no + // substitution occurred. However, we still need to instantiate + // the function parameters themselves. + const FunctionProtoType *OldProto = + cast<FunctionProtoType>(OldProtoLoc.getType()); for (unsigned i = 0, i_end = OldProtoLoc.getNumArgs(); i != i_end; ++i) { - ParmVarDecl *Parm = VisitParmVarDecl(OldProtoLoc.getArg(i)); + ParmVarDecl *OldParam = OldProtoLoc.getArg(i); + if (!OldParam) { + Params.push_back(SemaRef.BuildParmVarDeclForTypedef( + D, D->getLocation(), OldProto->getArgType(i))); + continue; + } + + ParmVarDecl *Parm = + cast_or_null<ParmVarDecl>(VisitParmVarDecl(OldParam)); if (!Parm) return 0; Params.push_back(Parm); } } + } else { + // If the type of this function, after ignoring parentheses, is not + // *directly* a function type, then we're instantiating a function that + // was declared via a typedef or with attributes, e.g., + // + // typedef int functype(int, int); + // functype func; + // int __cdecl meth(int, int); + // + // In this case, we'll just go instantiate the ParmVarDecls that we + // synthesized in the method declaration. + SmallVector<QualType, 4> ParamTypes; + if (SemaRef.SubstParmTypes(D->getLocation(), D->param_begin(), + D->getNumParams(), TemplateArgs, ParamTypes, + &Params)) + return 0; } + return NewTInfo; } @@ -2585,8 +3026,7 @@ static void InstantiateExceptionSpec(Sema &SemaRef, FunctionDecl *New, bool Expand = false; bool RetainExpansion = false; - Optional<unsigned> NumExpansions - = PackExpansion->getNumExpansions(); + Optional<unsigned> NumExpansions = PackExpansion->getNumExpansions(); if (SemaRef.CheckParameterPacksForExpansion(New->getLocation(), SourceRange(), Unexpanded, @@ -2674,9 +3114,7 @@ static void InstantiateExceptionSpec(Sema &SemaRef, FunctionDecl *New, EPI.NoexceptExpr = NoexceptExpr; New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(), - ArrayRef<QualType>(NewProto->arg_type_begin(), - NewProto->getNumArgs()), - EPI)); + NewProto->getArgTypes(), EPI)); } void Sema::InstantiateExceptionSpec(SourceLocation PointOfInstantiation, @@ -2687,15 +3125,13 @@ void Sema::InstantiateExceptionSpec(SourceLocation PointOfInstantiation, InstantiatingTemplate Inst(*this, PointOfInstantiation, Decl, InstantiatingTemplate::ExceptionSpecification()); - if (Inst) { + if (Inst.isInvalid()) { // We hit the instantiation depth limit. Clear the exception specification // so that our callers don't have to cope with EST_Uninstantiated. FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); EPI.ExceptionSpecType = EST_None; Decl->setType(Context.getFunctionType(Proto->getResultType(), - ArrayRef<QualType>(Proto->arg_type_begin(), - Proto->getNumArgs()), - EPI)); + Proto->getArgTypes(), EPI)); return; } @@ -2774,10 +3210,8 @@ TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, EPI.ExceptionSpecType = NewEST; EPI.ExceptionSpecDecl = New; EPI.ExceptionSpecTemplate = ExceptionSpecTemplate; - New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(), - ArrayRef<QualType>(NewProto->arg_type_begin(), - NewProto->getNumArgs()), - EPI)); + New->setType(SemaRef.Context.getFunctionType( + NewProto->getResultType(), NewProto->getArgTypes(), EPI)); } else { ::InstantiateExceptionSpec(SemaRef, New, Proto, TemplateArgs); } @@ -2862,11 +3296,17 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, return; } - // Call the LateTemplateParser callback if there a need to late parse + // Call the LateTemplateParser callback if there is a need to late parse // a templated function definition. if (!Pattern && PatternDecl->isLateTemplateParsed() && LateTemplateParser) { - LateTemplateParser(OpaqueParser, PatternDecl); + // FIXME: Optimize to allow individual templates to be deserialized. + if (PatternDecl->isFromASTFile()) + ExternalSource->ReadLateParsedTemplates(LateParsedTemplateMap); + + LateParsedTemplate *LPT = LateParsedTemplateMap.lookup(PatternDecl); + assert(LPT && "missing LateParsedTemplate"); + LateTemplateParser(OpaqueParser, *LPT); Pattern = PatternDecl->getBody(PatternDecl); } @@ -2902,14 +3342,14 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, if (Function->getTemplateSpecializationKind() == TSK_ExplicitInstantiationDeclaration && !PatternDecl->isInlined() && - !PatternDecl->getResultType()->isUndeducedType()) + !PatternDecl->getResultType()->getContainedAutoType()) return; if (PatternDecl->isInlined()) Function->setImplicitlyInline(); InstantiatingTemplate Inst(*this, PointOfInstantiation, Function); - if (Inst) + if (Inst.isInvalid()) return; // Copy the inner loc start from the pattern. @@ -2920,6 +3360,8 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, // while we're still within our own instantiation context. SmallVector<VTableUse, 16> SavedVTableUses; std::deque<PendingImplicitInstantiation> SavedPendingInstantiations; + SavePendingLocalImplicitInstantiationsRAII + SavedPendingLocalImplicitInstantiations(*this); if (Recursive) { VTableUses.swap(SavedVTableUses); PendingInstantiations.swap(SavedPendingInstantiations); @@ -3002,6 +3444,202 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, } } +VarTemplateSpecializationDecl *Sema::BuildVarTemplateInstantiation( + VarTemplateDecl *VarTemplate, VarDecl *FromVar, + const TemplateArgumentList &TemplateArgList, + const TemplateArgumentListInfo &TemplateArgsInfo, + SmallVectorImpl<TemplateArgument> &Converted, + SourceLocation PointOfInstantiation, void *InsertPos, + LateInstantiatedAttrVec *LateAttrs, + LocalInstantiationScope *StartingScope) { + if (FromVar->isInvalidDecl()) + return 0; + + InstantiatingTemplate Inst(*this, PointOfInstantiation, FromVar); + if (Inst.isInvalid()) + return 0; + + MultiLevelTemplateArgumentList TemplateArgLists; + TemplateArgLists.addOuterTemplateArguments(&TemplateArgList); + + // Instantiate the first declaration of the variable template: for a partial + // specialization of a static data member template, the first declaration may + // or may not be the declaration in the class; if it's in the class, we want + // to instantiate a member in the class (a declaration), and if it's outside, + // we want to instantiate a definition. + FromVar = FromVar->getFirstDecl(); + + MultiLevelTemplateArgumentList MultiLevelList(TemplateArgList); + TemplateDeclInstantiator Instantiator(*this, FromVar->getDeclContext(), + MultiLevelList); + + // TODO: Set LateAttrs and StartingScope ... + + return cast_or_null<VarTemplateSpecializationDecl>( + Instantiator.VisitVarTemplateSpecializationDecl( + VarTemplate, FromVar, InsertPos, TemplateArgsInfo, Converted)); +} + +/// \brief Instantiates a variable template specialization by completing it +/// with appropriate type information and initializer. +VarTemplateSpecializationDecl *Sema::CompleteVarTemplateSpecializationDecl( + VarTemplateSpecializationDecl *VarSpec, VarDecl *PatternDecl, + const MultiLevelTemplateArgumentList &TemplateArgs) { + + // Do substitution on the type of the declaration + TypeSourceInfo *DI = + SubstType(PatternDecl->getTypeSourceInfo(), TemplateArgs, + PatternDecl->getTypeSpecStartLoc(), PatternDecl->getDeclName()); + if (!DI) + return 0; + + // Update the type of this variable template specialization. + VarSpec->setType(DI->getType()); + + // Instantiate the initializer. + InstantiateVariableInitializer(VarSpec, PatternDecl, TemplateArgs); + + return VarSpec; +} + +/// BuildVariableInstantiation - Used after a new variable has been created. +/// Sets basic variable data and decides whether to postpone the +/// variable instantiation. +void Sema::BuildVariableInstantiation( + VarDecl *NewVar, VarDecl *OldVar, + const MultiLevelTemplateArgumentList &TemplateArgs, + LateInstantiatedAttrVec *LateAttrs, DeclContext *Owner, + LocalInstantiationScope *StartingScope, + bool InstantiatingVarTemplate) { + + // If we are instantiating a local extern declaration, the + // instantiation belongs lexically to the containing function. + // If we are instantiating a static data member defined + // out-of-line, the instantiation will have the same lexical + // context (which will be a namespace scope) as the template. + if (OldVar->isLocalExternDecl()) { + NewVar->setLocalExternDecl(); + NewVar->setLexicalDeclContext(Owner); + } else if (OldVar->isOutOfLine()) + NewVar->setLexicalDeclContext(OldVar->getLexicalDeclContext()); + NewVar->setTSCSpec(OldVar->getTSCSpec()); + NewVar->setInitStyle(OldVar->getInitStyle()); + NewVar->setCXXForRangeDecl(OldVar->isCXXForRangeDecl()); + NewVar->setConstexpr(OldVar->isConstexpr()); + NewVar->setInitCapture(OldVar->isInitCapture()); + NewVar->setPreviousDeclInSameBlockScope( + OldVar->isPreviousDeclInSameBlockScope()); + NewVar->setAccess(OldVar->getAccess()); + + if (!OldVar->isStaticDataMember()) { + if (OldVar->isUsed(false)) + NewVar->setIsUsed(); + NewVar->setReferenced(OldVar->isReferenced()); + } + + // See if the old variable had a type-specifier that defined an anonymous tag. + // If it did, mark the new variable as being the declarator for the new + // anonymous tag. + if (const TagType *OldTagType = OldVar->getType()->getAs<TagType>()) { + TagDecl *OldTag = OldTagType->getDecl(); + if (OldTag->getDeclaratorForAnonDecl() == OldVar) { + TagDecl *NewTag = NewVar->getType()->castAs<TagType>()->getDecl(); + assert(!NewTag->hasNameForLinkage() && + !NewTag->hasDeclaratorForAnonDecl()); + NewTag->setDeclaratorForAnonDecl(NewVar); + } + } + + InstantiateAttrs(TemplateArgs, OldVar, NewVar, LateAttrs, StartingScope); + + if (NewVar->hasAttrs()) + CheckAlignasUnderalignment(NewVar); + + LookupResult Previous( + *this, NewVar->getDeclName(), NewVar->getLocation(), + NewVar->isLocalExternDecl() ? Sema::LookupRedeclarationWithLinkage + : Sema::LookupOrdinaryName, + Sema::ForRedeclaration); + + if (NewVar->isLocalExternDecl() && OldVar->getPreviousDecl()) { + // We have a previous declaration. Use that one, so we merge with the + // right type. + if (NamedDecl *NewPrev = FindInstantiatedDecl( + NewVar->getLocation(), OldVar->getPreviousDecl(), TemplateArgs)) + Previous.addDecl(NewPrev); + } else if (!isa<VarTemplateSpecializationDecl>(NewVar) && + OldVar->hasLinkage()) + LookupQualifiedName(Previous, NewVar->getDeclContext(), false); + CheckVariableDeclaration(NewVar, Previous); + + if (!InstantiatingVarTemplate) { + NewVar->getLexicalDeclContext()->addHiddenDecl(NewVar); + if (!NewVar->isLocalExternDecl() || !NewVar->getPreviousDecl()) + NewVar->getDeclContext()->makeDeclVisibleInContext(NewVar); + } + + if (!OldVar->isOutOfLine()) { + if (NewVar->getDeclContext()->isFunctionOrMethod()) + CurrentInstantiationScope->InstantiatedLocal(OldVar, NewVar); + } + + // Link instantiations of static data members back to the template from + // which they were instantiated. + if (NewVar->isStaticDataMember() && !InstantiatingVarTemplate) + NewVar->setInstantiationOfStaticDataMember(OldVar, + TSK_ImplicitInstantiation); + + // Delay instantiation of the initializer for variable templates until a + // definition of the variable is needed. + if (!isa<VarTemplateSpecializationDecl>(NewVar) && !InstantiatingVarTemplate) + InstantiateVariableInitializer(NewVar, OldVar, TemplateArgs); + + // Diagnose unused local variables with dependent types, where the diagnostic + // will have been deferred. + if (!NewVar->isInvalidDecl() && + NewVar->getDeclContext()->isFunctionOrMethod() && !NewVar->isUsed() && + OldVar->getType()->isDependentType()) + DiagnoseUnusedDecl(NewVar); +} + +/// \brief Instantiate the initializer of a variable. +void Sema::InstantiateVariableInitializer( + VarDecl *Var, VarDecl *OldVar, + const MultiLevelTemplateArgumentList &TemplateArgs) { + + if (Var->getAnyInitializer()) + // We already have an initializer in the class. + return; + + if (OldVar->getInit()) { + if (Var->isStaticDataMember() && !OldVar->isOutOfLine()) + PushExpressionEvaluationContext(Sema::ConstantEvaluated, OldVar); + else + PushExpressionEvaluationContext(Sema::PotentiallyEvaluated, OldVar); + + // Instantiate the initializer. + ExprResult Init = + SubstInitializer(OldVar->getInit(), TemplateArgs, + OldVar->getInitStyle() == VarDecl::CallInit); + if (!Init.isInvalid()) { + bool TypeMayContainAuto = true; + if (Init.get()) { + bool DirectInit = OldVar->isDirectInit(); + AddInitializerToDecl(Var, Init.take(), DirectInit, TypeMayContainAuto); + } else + ActOnUninitializedDecl(Var, TypeMayContainAuto); + } else { + // FIXME: Not too happy about invalidating the declaration + // because of a bogus initializer. + Var->setInvalidDecl(); + } + + PopExpressionEvaluationContext(); + } else if ((!Var->isStaticDataMember() || Var->isOutOfLine()) && + !Var->isCXXForRangeDecl()) + ActOnUninitializedDecl(Var, false); +} + /// \brief Instantiate the definition of the given variable from its /// template. /// @@ -3023,26 +3661,151 @@ void Sema::InstantiateStaticDataMemberDefinition( VarDecl *Var, bool Recursive, bool DefinitionRequired) { + InstantiateVariableDefinition(PointOfInstantiation, Var, Recursive, + DefinitionRequired); +} + +void Sema::InstantiateVariableDefinition(SourceLocation PointOfInstantiation, + VarDecl *Var, bool Recursive, + bool DefinitionRequired) { if (Var->isInvalidDecl()) return; - // 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(); + VarTemplateSpecializationDecl *VarSpec = + dyn_cast<VarTemplateSpecializationDecl>(Var); + VarDecl *PatternDecl = 0, *Def = 0; + MultiLevelTemplateArgumentList TemplateArgs = + getTemplateInstantiationArgs(Var); + + if (VarSpec) { + // If this is a variable template specialization, make sure that it is + // non-dependent, then find its instantiation pattern. + bool InstantiationDependent = false; + assert(!TemplateSpecializationType::anyDependentTemplateArguments( + VarSpec->getTemplateArgsInfo(), InstantiationDependent) && + "Only instantiate variable template specializations that are " + "not type-dependent"); + (void)InstantiationDependent; + + // Find the variable initialization that we'll be substituting. If the + // pattern was instantiated from a member template, look back further to + // find the real pattern. + assert(VarSpec->getSpecializedTemplate() && + "Specialization without specialized template?"); + llvm::PointerUnion<VarTemplateDecl *, + VarTemplatePartialSpecializationDecl *> PatternPtr = + VarSpec->getSpecializedTemplateOrPartial(); + if (PatternPtr.is<VarTemplatePartialSpecializationDecl *>()) { + VarTemplatePartialSpecializationDecl *Tmpl = + PatternPtr.get<VarTemplatePartialSpecializationDecl *>(); + while (VarTemplatePartialSpecializationDecl *From = + Tmpl->getInstantiatedFromMember()) { + if (Tmpl->isMemberSpecialization()) + break; + + Tmpl = From; + } + PatternDecl = Tmpl; + } else { + VarTemplateDecl *Tmpl = PatternPtr.get<VarTemplateDecl *>(); + while (VarTemplateDecl *From = + Tmpl->getInstantiatedFromMemberTemplate()) { + if (Tmpl->isMemberSpecialization()) + break; + + Tmpl = From; + } + PatternDecl = Tmpl->getTemplatedDecl(); + } + + // If this is a static data member template, there might be an + // uninstantiated initializer on the declaration. If so, instantiate + // it now. + if (PatternDecl->isStaticDataMember() && + (PatternDecl = PatternDecl->getFirstDecl())->hasInit() && + !Var->hasInit()) { + // FIXME: Factor out the duplicated instantiation context setup/tear down + // code here. + InstantiatingTemplate Inst(*this, PointOfInstantiation, Var); + if (Inst.isInvalid()) + return; + + // If we're performing recursive template instantiation, create our own + // queue of pending implicit instantiations that we will instantiate + // later, while we're still within our own instantiation context. + SmallVector<VTableUse, 16> SavedVTableUses; + std::deque<PendingImplicitInstantiation> SavedPendingInstantiations; + if (Recursive) { + VTableUses.swap(SavedVTableUses); + PendingInstantiations.swap(SavedPendingInstantiations); + } + + LocalInstantiationScope Local(*this); + + // Enter the scope of this instantiation. We don't use + // PushDeclContext because we don't have a scope. + ContextRAII PreviousContext(*this, Var->getDeclContext()); + InstantiateVariableInitializer(Var, PatternDecl, TemplateArgs); + PreviousContext.pop(); + + // FIXME: Need to inform the ASTConsumer that we instantiated the + // initializer? + // This variable may have local implicit instantiations that need to be + // instantiated within this scope. + PerformPendingInstantiations(/*LocalOnly=*/true); + + Local.Exit(); + + if (Recursive) { + // Define any newly required vtables. + DefineUsedVTables(); + + // Instantiate any pending implicit instantiations found during the + // instantiation of this template. + PerformPendingInstantiations(); + + // Restore the set of pending vtables. + assert(VTableUses.empty() && + "VTableUses should be empty before it is discarded."); + VTableUses.swap(SavedVTableUses); + + // Restore the set of pending implicit instantiations. + assert(PendingInstantiations.empty() && + "PendingInstantiations should be empty before it is discarded."); + PendingInstantiations.swap(SavedPendingInstantiations); + } + } + + // Find actual definition + Def = PatternDecl->getDefinition(getASTContext()); + } else { + // If this is a static data member, find its out-of-line definition. + assert(Var->isStaticDataMember() && "not a static data member?"); + PatternDecl = Var->getInstantiatedFromStaticDataMember(); + + assert(PatternDecl && "data member was not instantiated from a template?"); + assert(PatternDecl->isStaticDataMember() && "not a static data member?"); + Def = PatternDecl->getOutOfLineDefinition(); + } + + // If we don't have a definition of the variable template, we won't perform + // any instantiation. Rather, we rely on the user to instantiate this + // definition (or provide a specialization for it) in another translation + // unit. if (!Def) { - // 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); + if (VarSpec) + Diag(PointOfInstantiation, + diag::err_explicit_instantiation_undefined_var_template) << Var; + else + Diag(PointOfInstantiation, + diag::err_explicit_instantiation_undefined_member) + << 2 << Var->getDeclName() << Var->getDeclContext(); + Diag(PatternDecl->getLocation(), + diag::note_explicit_instantiation_here); + if (VarSpec) + Var->setInvalidDecl(); } else if (Var->getTemplateSpecializationKind() == TSK_ExplicitInstantiationDefinition) { PendingInstantiations.push_back( @@ -3058,8 +3821,8 @@ void Sema::InstantiateStaticDataMemberDefinition( if (TSK == TSK_ExplicitSpecialization) return; - // C++0x [temp.explicit]p9: - // Except for inline functions, other explicit instantiation declarations + // C++11 [temp.explicit]p10: + // Except for inline functions, [...] explicit instantiation declarations // have the effect of suppressing the implicit instantiation of the entity // to which they refer. if (TSK == TSK_ExplicitInstantiationDeclaration) @@ -3088,7 +3851,7 @@ void Sema::InstantiateStaticDataMemberDefinition( } InstantiatingTemplate Inst(*this, PointOfInstantiation, Var); - if (Inst) + if (Inst.isInvalid()) return; // If we're performing recursive template instantiation, create our own @@ -3096,6 +3859,8 @@ void Sema::InstantiateStaticDataMemberDefinition( // while we're still within our own instantiation context. SmallVector<VTableUse, 16> SavedVTableUses; std::deque<PendingImplicitInstantiation> SavedPendingInstantiations; + SavePendingLocalImplicitInstantiationsRAII + SavedPendingLocalImplicitInstantiations(*this); if (Recursive) { VTableUses.swap(SavedVTableUses); PendingInstantiations.swap(SavedPendingInstantiations); @@ -3103,22 +3868,58 @@ void Sema::InstantiateStaticDataMemberDefinition( // Enter the scope of this instantiation. We don't use // PushDeclContext because we don't have a scope. - ContextRAII previousContext(*this, Var->getDeclContext()); + ContextRAII PreviousContext(*this, Var->getDeclContext()); LocalInstantiationScope Local(*this); - + VarDecl *OldVar = Var; - Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(), - getTemplateInstantiationArgs(Var))); + if (!VarSpec) + Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(), + TemplateArgs)); + else if (Var->isStaticDataMember() && + Var->getLexicalDeclContext()->isRecord()) { + // We need to instantiate the definition of a static data member template, + // and all we have is the in-class declaration of it. Instantiate a separate + // declaration of the definition. + TemplateDeclInstantiator Instantiator(*this, Var->getDeclContext(), + TemplateArgs); + Var = cast_or_null<VarDecl>(Instantiator.VisitVarTemplateSpecializationDecl( + VarSpec->getSpecializedTemplate(), Def, 0, + VarSpec->getTemplateArgsInfo(), VarSpec->getTemplateArgs().asArray())); + if (Var) { + llvm::PointerUnion<VarTemplateDecl *, + VarTemplatePartialSpecializationDecl *> PatternPtr = + VarSpec->getSpecializedTemplateOrPartial(); + if (VarTemplatePartialSpecializationDecl *Partial = + PatternPtr.dyn_cast<VarTemplatePartialSpecializationDecl *>()) + cast<VarTemplateSpecializationDecl>(Var)->setInstantiationOf( + Partial, &VarSpec->getTemplateInstantiationArgs()); + + // Merge the definition with the declaration. + LookupResult R(*this, Var->getDeclName(), Var->getLocation(), + LookupOrdinaryName, ForRedeclaration); + R.addDecl(OldVar); + MergeVarDecl(Var, R); + + // Attach the initializer. + InstantiateVariableInitializer(Var, Def, TemplateArgs); + } + } else + // Complete the existing variable's definition with an appropriately + // substituted type and initializer. + Var = CompleteVarTemplateSpecializationDecl(VarSpec, Def, TemplateArgs); - previousContext.pop(); + PreviousContext.pop(); if (Var) { PassToConsumerRAII.Var = Var; - MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo(); - assert(MSInfo && "Missing member specialization information?"); - Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(), - MSInfo->getPointOfInstantiation()); + Var->setTemplateSpecializationKind(OldVar->getTemplateSpecializationKind(), + OldVar->getPointOfInstantiation()); } + + // This variable may have local implicit instantiations that need to be + // instantiated within this scope. + PerformPendingInstantiations(/*LocalOnly=*/true); + Local.Exit(); if (Recursive) { @@ -3131,14 +3932,12 @@ void Sema::InstantiateStaticDataMemberDefinition( // Restore the set of pending vtables. assert(VTableUses.empty() && - "VTableUses should be empty before it is discarded, " - "while instantiating static data member."); + "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, " - "while instantiating static data member."); + "PendingInstantiations should be empty before it is discarded."); PendingInstantiations.swap(SavedPendingInstantiations); } } @@ -3167,8 +3966,9 @@ Sema::InstantiateMemInitializers(CXXConstructorDecl *New, if (Init->isPackExpansion()) { // This is a pack expansion. We should expand it now. TypeLoc BaseTL = Init->getTypeSourceInfo()->getTypeLoc(); - SmallVector<UnexpandedParameterPack, 2> Unexpanded; + SmallVector<UnexpandedParameterPack, 4> Unexpanded; collectUnexpandedParameterPacks(BaseTL, Unexpanded); + collectUnexpandedParameterPacks(Init->getInit(), Unexpanded); bool ShouldExpand = false; bool RetainExpansion = false; Optional<unsigned> NumExpansions; @@ -3523,14 +4323,33 @@ DeclContext *Sema::FindInstantiatedContext(SourceLocation Loc, DeclContext* DC, /// 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>. +/// In the instantiation of <tt>X<int>::getKind()</tt>, we need to map the +/// \p EnumConstantDecl for \p KnownValue (which refers to +/// <tt>X<T>::<Kind>::KnownValue</tt>) to its instantiation +/// (<tt>X<int>::<Kind>::KnownValue</tt>). \p FindInstantiatedDecl performs +/// this mapping from within the instantiation of <tt>X<int></tt>. NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, const MultiLevelTemplateArgumentList &TemplateArgs) { DeclContext *ParentDC = D->getDeclContext(); + // FIXME: Parmeters of pointer to functions (y below) that are themselves + // parameters (p below) can have their ParentDC set to the translation-unit + // - thus we can not consistently check if the ParentDC of such a parameter + // is Dependent or/and a FunctionOrMethod. + // For e.g. this code, during Template argument deduction tries to + // find an instantiated decl for (T y) when the ParentDC for y is + // the translation unit. + // e.g. template <class T> void Foo(auto (*p)(T y) -> decltype(y())) {} + // float baz(float(*)()) { return 0.0; }
+ // Foo(baz); + // The better fix here is perhaps to ensure that a ParmVarDecl, by the time + // it gets here, always has a FunctionOrMethod as its ParentDC?? + // For now: + // - as long as we have a ParmVarDecl whose parent is non-dependent and + // whose type is not instantiation dependent, do nothing to the decl + // - otherwise find its instantiated decl. + if (isa<ParmVarDecl>(D) && !ParentDC->isDependentContext() && + !cast<ParmVarDecl>(D)->getType()->isInstantiationDependentType()) + return D; if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) || isa<TemplateTemplateParmDecl>(D) || (ParentDC->isFunctionOrMethod() && ParentDC->isDependentContext()) || @@ -3550,6 +4369,16 @@ NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, return cast<NamedDecl>((*Found->get<DeclArgumentPack *>())[PackIdx]); } + // If we're performing a partial substitution during template argument + // deduction, we may not have values for template parameters yet. They + // just map to themselves. + if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) || + isa<TemplateTemplateParmDecl>(D)) + return D; + + if (D->isInvalidDecl()) + return 0; + // If we didn't find the decl, then we must have a label decl that hasn't // been found yet. Lazily instantiate it and return it now. assert(isa<LabelDecl>(D)); @@ -3561,6 +4390,20 @@ NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, return cast<LabelDecl>(Inst); } + // For variable template specializations, update those that are still + // type-dependent. + if (VarTemplateSpecializationDecl *VarSpec = + dyn_cast<VarTemplateSpecializationDecl>(D)) { + bool InstantiationDependent = false; + const TemplateArgumentListInfo &VarTemplateArgs = + VarSpec->getTemplateArgsInfo(); + if (TemplateSpecializationType::anyDependentTemplateArguments( + VarTemplateArgs, InstantiationDependent)) + D = cast<NamedDecl>( + SubstDecl(D, VarSpec->getDeclContext(), TemplateArgs)); + return D; + } + if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { if (!Record->isDependentContext()) return D; @@ -3573,7 +4416,7 @@ NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, 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; @@ -3582,7 +4425,7 @@ NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, // 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. @@ -3592,13 +4435,12 @@ NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, 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()){ @@ -3606,7 +4448,7 @@ NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, continue; } } - + DC = DC->getParent(); } @@ -3739,9 +4581,13 @@ void Sema::PerformPendingInstantiations(bool LocalOnly) { continue; } - // Instantiate static data member definitions. + // Instantiate variable definitions VarDecl *Var = cast<VarDecl>(Inst.first); - assert(Var->isStaticDataMember() && "Not a static data member?"); + + assert((Var->isStaticDataMember() || + isa<VarTemplateSpecializationDecl>(Var)) && + "Not a static data member, nor a variable template" + " specialization?"); // Don't try to instantiate declarations if the most recent redeclaration // is invalid. @@ -3764,14 +4610,15 @@ void Sema::PerformPendingInstantiations(bool LocalOnly) { break; } - PrettyDeclStackTraceEntry CrashInfo(*this, Var, Var->getLocation(), - "instantiating static data member " - "definition"); - + PrettyDeclStackTraceEntry CrashInfo(*this, Var, SourceLocation(), + "instantiating variable definition"); bool DefinitionRequired = Var->getTemplateSpecializationKind() == TSK_ExplicitInstantiationDefinition; - InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true, - DefinitionRequired); + + // Instantiate static data member definitions or variable template + // specializations. + InstantiateVariableDefinition(/*FIXME:*/ Inst.second, Var, true, + DefinitionRequired); } } |
