Check in LLVM r95781.
diff --git a/lib/Sema/SemaTemplate.cpp b/lib/Sema/SemaTemplate.cpp
new file mode 100644
index 0000000..1779bde
--- /dev/null
+++ b/lib/Sema/SemaTemplate.cpp
@@ -0,0 +1,5083 @@
+//===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===/
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//===----------------------------------------------------------------------===/
+//
+// This file implements semantic analysis for C++ templates.
+//===----------------------------------------------------------------------===/
+
+#include "Sema.h"
+#include "Lookup.h"
+#include "TreeTransform.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Expr.h"
+#include "clang/AST/ExprCXX.h"
+#include "clang/AST/DeclTemplate.h"
+#include "clang/Parse/DeclSpec.h"
+#include "clang/Parse/Template.h"
+#include "clang/Basic/LangOptions.h"
+#include "clang/Basic/PartialDiagnostic.h"
+#include "llvm/ADT/StringExtras.h"
+using namespace clang;
+
+/// \brief Determine whether the declaration found is acceptable as the name
+/// of a template and, if so, return that template declaration. Otherwise,
+/// returns NULL.
+static NamedDecl *isAcceptableTemplateName(ASTContext &Context, NamedDecl *D) {
+ if (!D)
+ return 0;
+
+ if (isa<TemplateDecl>(D))
+ return D;
+
+ if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
+ // C++ [temp.local]p1:
+ // Like normal (non-template) classes, class templates have an
+ // injected-class-name (Clause 9). The injected-class-name
+ // can be used with or without a template-argument-list. When
+ // it is used without a template-argument-list, it is
+ // equivalent to the injected-class-name followed by the
+ // template-parameters of the class template enclosed in
+ // <>. When it is used with a template-argument-list, it
+ // refers to the specified class template specialization,
+ // which could be the current specialization or another
+ // specialization.
+ if (Record->isInjectedClassName()) {
+ Record = cast<CXXRecordDecl>(Record->getDeclContext());
+ if (Record->getDescribedClassTemplate())
+ return Record->getDescribedClassTemplate();
+
+ if (ClassTemplateSpecializationDecl *Spec
+ = dyn_cast<ClassTemplateSpecializationDecl>(Record))
+ return Spec->getSpecializedTemplate();
+ }
+
+ return 0;
+ }
+
+ return 0;
+}
+
+static void FilterAcceptableTemplateNames(ASTContext &C, LookupResult &R) {
+ LookupResult::Filter filter = R.makeFilter();
+ while (filter.hasNext()) {
+ NamedDecl *Orig = filter.next();
+ NamedDecl *Repl = isAcceptableTemplateName(C, Orig->getUnderlyingDecl());
+ if (!Repl)
+ filter.erase();
+ else if (Repl != Orig)
+ filter.replace(Repl);
+ }
+ filter.done();
+}
+
+TemplateNameKind Sema::isTemplateName(Scope *S,
+ const CXXScopeSpec &SS,
+ UnqualifiedId &Name,
+ TypeTy *ObjectTypePtr,
+ bool EnteringContext,
+ TemplateTy &TemplateResult) {
+ assert(getLangOptions().CPlusPlus && "No template names in C!");
+
+ DeclarationName TName;
+
+ switch (Name.getKind()) {
+ case UnqualifiedId::IK_Identifier:
+ TName = DeclarationName(Name.Identifier);
+ break;
+
+ case UnqualifiedId::IK_OperatorFunctionId:
+ TName = Context.DeclarationNames.getCXXOperatorName(
+ Name.OperatorFunctionId.Operator);
+ break;
+
+ case UnqualifiedId::IK_LiteralOperatorId:
+ TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier);
+ break;
+
+ default:
+ return TNK_Non_template;
+ }
+
+ QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr);
+
+ LookupResult R(*this, TName, Name.getSourceRange().getBegin(),
+ LookupOrdinaryName);
+ R.suppressDiagnostics();
+ LookupTemplateName(R, S, SS, ObjectType, EnteringContext);
+ if (R.empty())
+ return TNK_Non_template;
+
+ TemplateName Template;
+ TemplateNameKind TemplateKind;
+
+ unsigned ResultCount = R.end() - R.begin();
+ if (ResultCount > 1) {
+ // We assume that we'll preserve the qualifier from a function
+ // template name in other ways.
+ Template = Context.getOverloadedTemplateName(R.begin(), R.end());
+ TemplateKind = TNK_Function_template;
+ } else {
+ TemplateDecl *TD = cast<TemplateDecl>((*R.begin())->getUnderlyingDecl());
+
+ if (SS.isSet() && !SS.isInvalid()) {
+ NestedNameSpecifier *Qualifier
+ = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
+ Template = Context.getQualifiedTemplateName(Qualifier, false, TD);
+ } else {
+ Template = TemplateName(TD);
+ }
+
+ if (isa<FunctionTemplateDecl>(TD))
+ TemplateKind = TNK_Function_template;
+ else {
+ assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD));
+ TemplateKind = TNK_Type_template;
+ }
+ }
+
+ TemplateResult = TemplateTy::make(Template);
+ return TemplateKind;
+}
+
+bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II,
+ SourceLocation IILoc,
+ Scope *S,
+ const CXXScopeSpec *SS,
+ TemplateTy &SuggestedTemplate,
+ TemplateNameKind &SuggestedKind) {
+ // We can't recover unless there's a dependent scope specifier preceding the
+ // template name.
+ if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) ||
+ computeDeclContext(*SS))
+ return false;
+
+ // The code is missing a 'template' keyword prior to the dependent template
+ // name.
+ NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep();
+ Diag(IILoc, diag::err_template_kw_missing)
+ << Qualifier << II.getName()
+ << CodeModificationHint::CreateInsertion(IILoc, "template ");
+ SuggestedTemplate
+ = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II));
+ SuggestedKind = TNK_Dependent_template_name;
+ return true;
+}
+
+void Sema::LookupTemplateName(LookupResult &Found,
+ Scope *S, const CXXScopeSpec &SS,
+ QualType ObjectType,
+ bool EnteringContext) {
+ // Determine where to perform name lookup
+ DeclContext *LookupCtx = 0;
+ bool isDependent = false;
+ if (!ObjectType.isNull()) {
+ // This nested-name-specifier occurs in a member access expression, e.g.,
+ // x->B::f, and we are looking into the type of the object.
+ assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist");
+ LookupCtx = computeDeclContext(ObjectType);
+ isDependent = ObjectType->isDependentType();
+ assert((isDependent || !ObjectType->isIncompleteType()) &&
+ "Caller should have completed object type");
+ } else if (SS.isSet()) {
+ // This nested-name-specifier occurs after another nested-name-specifier,
+ // so long into the context associated with the prior nested-name-specifier.
+ LookupCtx = computeDeclContext(SS, EnteringContext);
+ isDependent = isDependentScopeSpecifier(SS);
+
+ // The declaration context must be complete.
+ if (LookupCtx && RequireCompleteDeclContext(SS))
+ return;
+ }
+
+ bool ObjectTypeSearchedInScope = false;
+ if (LookupCtx) {
+ // Perform "qualified" name lookup into the declaration context we
+ // computed, which is either the type of the base of a member access
+ // expression or the declaration context associated with a prior
+ // nested-name-specifier.
+ LookupQualifiedName(Found, LookupCtx);
+
+ if (!ObjectType.isNull() && Found.empty()) {
+ // C++ [basic.lookup.classref]p1:
+ // In a class member access expression (5.2.5), if the . or -> token is
+ // immediately followed by an identifier followed by a <, the
+ // identifier must be looked up to determine whether the < is the
+ // beginning of a template argument list (14.2) or a less-than operator.
+ // The identifier is first looked up in the class of the object
+ // expression. If the identifier is not found, it is then looked up in
+ // the context of the entire postfix-expression and shall name a class
+ // or function template.
+ //
+ // FIXME: When we're instantiating a template, do we actually have to
+ // look in the scope of the template? Seems fishy...
+ if (S) LookupName(Found, S);
+ ObjectTypeSearchedInScope = true;
+ }
+ } else if (isDependent) {
+ // We cannot look into a dependent object type or nested nme
+ // specifier.
+ return;
+ } else {
+ // Perform unqualified name lookup in the current scope.
+ LookupName(Found, S);
+ }
+
+ // FIXME: Cope with ambiguous name-lookup results.
+ assert(!Found.isAmbiguous() &&
+ "Cannot handle template name-lookup ambiguities");
+
+ if (Found.empty() && !isDependent) {
+ // If we did not find any names, attempt to correct any typos.
+ DeclarationName Name = Found.getLookupName();
+ if (CorrectTypo(Found, S, &SS, LookupCtx)) {
+ FilterAcceptableTemplateNames(Context, Found);
+ if (!Found.empty() && isa<TemplateDecl>(*Found.begin())) {
+ if (LookupCtx)
+ Diag(Found.getNameLoc(), diag::err_no_member_template_suggest)
+ << Name << LookupCtx << Found.getLookupName() << SS.getRange()
+ << CodeModificationHint::CreateReplacement(Found.getNameLoc(),
+ Found.getLookupName().getAsString());
+ else
+ Diag(Found.getNameLoc(), diag::err_no_template_suggest)
+ << Name << Found.getLookupName()
+ << CodeModificationHint::CreateReplacement(Found.getNameLoc(),
+ Found.getLookupName().getAsString());
+ if (TemplateDecl *Template = Found.getAsSingle<TemplateDecl>())
+ Diag(Template->getLocation(), diag::note_previous_decl)
+ << Template->getDeclName();
+ } else
+ Found.clear();
+ } else {
+ Found.clear();
+ }
+ }
+
+ FilterAcceptableTemplateNames(Context, Found);
+ if (Found.empty())
+ return;
+
+ if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope) {
+ // C++ [basic.lookup.classref]p1:
+ // [...] If the lookup in the class of the object expression finds a
+ // template, the name is also looked up in the context of the entire
+ // postfix-expression and [...]
+ //
+ LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(),
+ LookupOrdinaryName);
+ LookupName(FoundOuter, S);
+ FilterAcceptableTemplateNames(Context, FoundOuter);
+ // FIXME: Handle ambiguities in this lookup better
+
+ if (FoundOuter.empty()) {
+ // - if the name is not found, the name found in the class of the
+ // object expression is used, otherwise
+ } else if (!FoundOuter.getAsSingle<ClassTemplateDecl>()) {
+ // - if the name is found in the context of the entire
+ // postfix-expression and does not name a class template, the name
+ // found in the class of the object expression is used, otherwise
+ } else {
+ // - if the name found is a class template, it must refer to the same
+ // entity as the one found in the class of the object expression,
+ // otherwise the program is ill-formed.
+ if (!Found.isSingleResult() ||
+ Found.getFoundDecl()->getCanonicalDecl()
+ != FoundOuter.getFoundDecl()->getCanonicalDecl()) {
+ Diag(Found.getNameLoc(),
+ diag::err_nested_name_member_ref_lookup_ambiguous)
+ << Found.getLookupName();
+ Diag(Found.getRepresentativeDecl()->getLocation(),
+ diag::note_ambig_member_ref_object_type)
+ << ObjectType;
+ Diag(FoundOuter.getFoundDecl()->getLocation(),
+ diag::note_ambig_member_ref_scope);
+
+ // Recover by taking the template that we found in the object
+ // expression's type.
+ }
+ }
+ }
+}
+
+/// ActOnDependentIdExpression - Handle a dependent id-expression that
+/// was just parsed. This is only possible with an explicit scope
+/// specifier naming a dependent type.
+Sema::OwningExprResult
+Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
+ DeclarationName Name,
+ SourceLocation NameLoc,
+ bool isAddressOfOperand,
+ const TemplateArgumentListInfo *TemplateArgs) {
+ NestedNameSpecifier *Qualifier
+ = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
+
+ if (!isAddressOfOperand &&
+ isa<CXXMethodDecl>(CurContext) &&
+ cast<CXXMethodDecl>(CurContext)->isInstance()) {
+ QualType ThisType = cast<CXXMethodDecl>(CurContext)->getThisType(Context);
+
+ // Since the 'this' expression is synthesized, we don't need to
+ // perform the double-lookup check.
+ NamedDecl *FirstQualifierInScope = 0;
+
+ return Owned(CXXDependentScopeMemberExpr::Create(Context,
+ /*This*/ 0, ThisType,
+ /*IsArrow*/ true,
+ /*Op*/ SourceLocation(),
+ Qualifier, SS.getRange(),
+ FirstQualifierInScope,
+ Name, NameLoc,
+ TemplateArgs));
+ }
+
+ return BuildDependentDeclRefExpr(SS, Name, NameLoc, TemplateArgs);
+}
+
+Sema::OwningExprResult
+Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
+ DeclarationName Name,
+ SourceLocation NameLoc,
+ const TemplateArgumentListInfo *TemplateArgs) {
+ return Owned(DependentScopeDeclRefExpr::Create(Context,
+ static_cast<NestedNameSpecifier*>(SS.getScopeRep()),
+ SS.getRange(),
+ Name, NameLoc,
+ TemplateArgs));
+}
+
+/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
+/// that the template parameter 'PrevDecl' is being shadowed by a new
+/// declaration at location Loc. Returns true to indicate that this is
+/// an error, and false otherwise.
+bool Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
+ assert(PrevDecl->isTemplateParameter() && "Not a template parameter");
+
+ // Microsoft Visual C++ permits template parameters to be shadowed.
+ if (getLangOptions().Microsoft)
+ return false;
+
+ // C++ [temp.local]p4:
+ // A template-parameter shall not be redeclared within its
+ // scope (including nested scopes).
+ Diag(Loc, diag::err_template_param_shadow)
+ << cast<NamedDecl>(PrevDecl)->getDeclName();
+ Diag(PrevDecl->getLocation(), diag::note_template_param_here);
+ return true;
+}
+
+/// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
+/// the parameter D to reference the templated declaration and return a pointer
+/// to the template declaration. Otherwise, do nothing to D and return null.
+TemplateDecl *Sema::AdjustDeclIfTemplate(DeclPtrTy &D) {
+ if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D.getAs<Decl>())) {
+ D = DeclPtrTy::make(Temp->getTemplatedDecl());
+ return Temp;
+ }
+ return 0;
+}
+
+static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
+ const ParsedTemplateArgument &Arg) {
+
+ switch (Arg.getKind()) {
+ case ParsedTemplateArgument::Type: {
+ TypeSourceInfo *DI;
+ QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
+ if (!DI)
+ DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
+ return TemplateArgumentLoc(TemplateArgument(T), DI);
+ }
+
+ case ParsedTemplateArgument::NonType: {
+ Expr *E = static_cast<Expr *>(Arg.getAsExpr());
+ return TemplateArgumentLoc(TemplateArgument(E), E);
+ }
+
+ case ParsedTemplateArgument::Template: {
+ TemplateName Template
+ = TemplateName::getFromVoidPointer(Arg.getAsTemplate().get());
+ return TemplateArgumentLoc(TemplateArgument(Template),
+ Arg.getScopeSpec().getRange(),
+ Arg.getLocation());
+ }
+ }
+
+ llvm_unreachable("Unhandled parsed template argument");
+ return TemplateArgumentLoc();
+}
+
+/// \brief Translates template arguments as provided by the parser
+/// into template arguments used by semantic analysis.
+void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn,
+ TemplateArgumentListInfo &TemplateArgs) {
+ for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I)
+ TemplateArgs.addArgument(translateTemplateArgument(*this,
+ TemplateArgsIn[I]));
+}
+
+/// ActOnTypeParameter - Called when a C++ template type parameter
+/// (e.g., "typename T") has been parsed. Typename specifies whether
+/// the keyword "typename" was used to declare the type parameter
+/// (otherwise, "class" was used), and KeyLoc is the location of the
+/// "class" or "typename" keyword. ParamName is the name of the
+/// parameter (NULL indicates an unnamed template parameter) and
+/// ParamName is the location of the parameter name (if any).
+/// If the type parameter has a default argument, it will be added
+/// later via ActOnTypeParameterDefault.
+Sema::DeclPtrTy Sema::ActOnTypeParameter(Scope *S, bool Typename, bool Ellipsis,
+ SourceLocation EllipsisLoc,
+ SourceLocation KeyLoc,
+ IdentifierInfo *ParamName,
+ SourceLocation ParamNameLoc,
+ unsigned Depth, unsigned Position) {
+ assert(S->isTemplateParamScope() &&
+ "Template type parameter not in template parameter scope!");
+ bool Invalid = false;
+
+ if (ParamName) {
+ NamedDecl *PrevDecl = LookupSingleName(S, ParamName, LookupTagName);
+ if (PrevDecl && PrevDecl->isTemplateParameter())
+ Invalid = Invalid || DiagnoseTemplateParameterShadow(ParamNameLoc,
+ PrevDecl);
+ }
+
+ SourceLocation Loc = ParamNameLoc;
+ if (!ParamName)
+ Loc = KeyLoc;
+
+ TemplateTypeParmDecl *Param
+ = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(),
+ Loc, Depth, Position, ParamName, Typename,
+ Ellipsis);
+ if (Invalid)
+ Param->setInvalidDecl();
+
+ if (ParamName) {
+ // Add the template parameter into the current scope.
+ S->AddDecl(DeclPtrTy::make(Param));
+ IdResolver.AddDecl(Param);
+ }
+
+ return DeclPtrTy::make(Param);
+}
+
+/// ActOnTypeParameterDefault - Adds a default argument (the type
+/// Default) to the given template type parameter (TypeParam).
+void Sema::ActOnTypeParameterDefault(DeclPtrTy TypeParam,
+ SourceLocation EqualLoc,
+ SourceLocation DefaultLoc,
+ TypeTy *DefaultT) {
+ TemplateTypeParmDecl *Parm
+ = cast<TemplateTypeParmDecl>(TypeParam.getAs<Decl>());
+
+ TypeSourceInfo *DefaultTInfo;
+ GetTypeFromParser(DefaultT, &DefaultTInfo);
+
+ assert(DefaultTInfo && "expected source information for type");
+
+ // C++0x [temp.param]p9:
+ // A default template-argument may be specified for any kind of
+ // template-parameter that is not a template parameter pack.
+ if (Parm->isParameterPack()) {
+ Diag(DefaultLoc, diag::err_template_param_pack_default_arg);
+ return;
+ }
+
+ // C++ [temp.param]p14:
+ // A template-parameter shall not be used in its own default argument.
+ // FIXME: Implement this check! Needs a recursive walk over the types.
+
+ // Check the template argument itself.
+ if (CheckTemplateArgument(Parm, DefaultTInfo)) {
+ Parm->setInvalidDecl();
+ return;
+ }
+
+ Parm->setDefaultArgument(DefaultTInfo, false);
+}
+
+/// \brief Check that the type of a non-type template parameter is
+/// well-formed.
+///
+/// \returns the (possibly-promoted) parameter type if valid;
+/// otherwise, produces a diagnostic and returns a NULL type.
+QualType
+Sema::CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc) {
+ // C++ [temp.param]p4:
+ //
+ // A non-type template-parameter shall have one of the following
+ // (optionally cv-qualified) types:
+ //
+ // -- integral or enumeration type,
+ if (T->isIntegralType() || T->isEnumeralType() ||
+ // -- pointer to object or pointer to function,
+ (T->isPointerType() &&
+ (T->getAs<PointerType>()->getPointeeType()->isObjectType() ||
+ T->getAs<PointerType>()->getPointeeType()->isFunctionType())) ||
+ // -- reference to object or reference to function,
+ T->isReferenceType() ||
+ // -- pointer to member.
+ T->isMemberPointerType() ||
+ // If T is a dependent type, we can't do the check now, so we
+ // assume that it is well-formed.
+ T->isDependentType())
+ return T;
+ // C++ [temp.param]p8:
+ //
+ // A non-type template-parameter of type "array of T" or
+ // "function returning T" is adjusted to be of type "pointer to
+ // T" or "pointer to function returning T", respectively.
+ else if (T->isArrayType())
+ // FIXME: Keep the type prior to promotion?
+ return Context.getArrayDecayedType(T);
+ else if (T->isFunctionType())
+ // FIXME: Keep the type prior to promotion?
+ return Context.getPointerType(T);
+
+ Diag(Loc, diag::err_template_nontype_parm_bad_type)
+ << T;
+
+ return QualType();
+}
+
+/// ActOnNonTypeTemplateParameter - Called when a C++ non-type
+/// template parameter (e.g., "int Size" in "template<int Size>
+/// class Array") has been parsed. S is the current scope and D is
+/// the parsed declarator.
+Sema::DeclPtrTy Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
+ unsigned Depth,
+ unsigned Position) {
+ TypeSourceInfo *TInfo = 0;
+ QualType T = GetTypeForDeclarator(D, S, &TInfo);
+
+ assert(S->isTemplateParamScope() &&
+ "Non-type template parameter not in template parameter scope!");
+ bool Invalid = false;
+
+ IdentifierInfo *ParamName = D.getIdentifier();
+ if (ParamName) {
+ NamedDecl *PrevDecl = LookupSingleName(S, ParamName, LookupTagName);
+ if (PrevDecl && PrevDecl->isTemplateParameter())
+ Invalid = Invalid || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
+ PrevDecl);
+ }
+
+ T = CheckNonTypeTemplateParameterType(T, D.getIdentifierLoc());
+ if (T.isNull()) {
+ T = Context.IntTy; // Recover with an 'int' type.
+ Invalid = true;
+ }
+
+ NonTypeTemplateParmDecl *Param
+ = NonTypeTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
+ D.getIdentifierLoc(),
+ Depth, Position, ParamName, T, TInfo);
+ if (Invalid)
+ Param->setInvalidDecl();
+
+ if (D.getIdentifier()) {
+ // Add the template parameter into the current scope.
+ S->AddDecl(DeclPtrTy::make(Param));
+ IdResolver.AddDecl(Param);
+ }
+ return DeclPtrTy::make(Param);
+}
+
+/// \brief Adds a default argument to the given non-type template
+/// parameter.
+void Sema::ActOnNonTypeTemplateParameterDefault(DeclPtrTy TemplateParamD,
+ SourceLocation EqualLoc,
+ ExprArg DefaultE) {
+ NonTypeTemplateParmDecl *TemplateParm
+ = cast<NonTypeTemplateParmDecl>(TemplateParamD.getAs<Decl>());
+ Expr *Default = static_cast<Expr *>(DefaultE.get());
+
+ // C++ [temp.param]p14:
+ // A template-parameter shall not be used in its own default argument.
+ // FIXME: Implement this check! Needs a recursive walk over the types.
+
+ // Check the well-formedness of the default template argument.
+ TemplateArgument Converted;
+ if (CheckTemplateArgument(TemplateParm, TemplateParm->getType(), Default,
+ Converted)) {
+ TemplateParm->setInvalidDecl();
+ return;
+ }
+
+ TemplateParm->setDefaultArgument(DefaultE.takeAs<Expr>());
+}
+
+
+/// ActOnTemplateTemplateParameter - Called when a C++ template template
+/// parameter (e.g. T in template <template <typename> class T> class array)
+/// has been parsed. S is the current scope.
+Sema::DeclPtrTy Sema::ActOnTemplateTemplateParameter(Scope* S,
+ SourceLocation TmpLoc,
+ TemplateParamsTy *Params,
+ IdentifierInfo *Name,
+ SourceLocation NameLoc,
+ unsigned Depth,
+ unsigned Position) {
+ assert(S->isTemplateParamScope() &&
+ "Template template parameter not in template parameter scope!");
+
+ // Construct the parameter object.
+ TemplateTemplateParmDecl *Param =
+ TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
+ TmpLoc, Depth, Position, Name,
+ (TemplateParameterList*)Params);
+
+ // Make sure the parameter is valid.
+ // FIXME: Decl object is not currently invalidated anywhere so this doesn't
+ // do anything yet. However, if the template parameter list or (eventual)
+ // default value is ever invalidated, that will propagate here.
+ bool Invalid = false;
+ if (Invalid) {
+ Param->setInvalidDecl();
+ }
+
+ // If the tt-param has a name, then link the identifier into the scope
+ // and lookup mechanisms.
+ if (Name) {
+ S->AddDecl(DeclPtrTy::make(Param));
+ IdResolver.AddDecl(Param);
+ }
+
+ return DeclPtrTy::make(Param);
+}
+
+/// \brief Adds a default argument to the given template template
+/// parameter.
+void Sema::ActOnTemplateTemplateParameterDefault(DeclPtrTy TemplateParamD,
+ SourceLocation EqualLoc,
+ const ParsedTemplateArgument &Default) {
+ TemplateTemplateParmDecl *TemplateParm
+ = cast<TemplateTemplateParmDecl>(TemplateParamD.getAs<Decl>());
+
+ // C++ [temp.param]p14:
+ // A template-parameter shall not be used in its own default argument.
+ // FIXME: Implement this check! Needs a recursive walk over the types.
+
+ // Check only that we have a template template argument. We don't want to
+ // try to check well-formedness now, because our template template parameter
+ // might have dependent types in its template parameters, which we wouldn't
+ // be able to match now.
+ //
+ // If none of the template template parameter's template arguments mention
+ // other template parameters, we could actually perform more checking here.
+ // However, it isn't worth doing.
+ TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default);
+ if (DefaultArg.getArgument().getAsTemplate().isNull()) {
+ Diag(DefaultArg.getLocation(), diag::err_template_arg_not_class_template)
+ << DefaultArg.getSourceRange();
+ return;
+ }
+
+ TemplateParm->setDefaultArgument(DefaultArg);
+}
+
+/// ActOnTemplateParameterList - Builds a TemplateParameterList that
+/// contains the template parameters in Params/NumParams.
+Sema::TemplateParamsTy *
+Sema::ActOnTemplateParameterList(unsigned Depth,
+ SourceLocation ExportLoc,
+ SourceLocation TemplateLoc,
+ SourceLocation LAngleLoc,
+ DeclPtrTy *Params, unsigned NumParams,
+ SourceLocation RAngleLoc) {
+ if (ExportLoc.isValid())
+ Diag(ExportLoc, diag::warn_template_export_unsupported);
+
+ return TemplateParameterList::Create(Context, TemplateLoc, LAngleLoc,
+ (NamedDecl**)Params, NumParams,
+ RAngleLoc);
+}
+
+Sema::DeclResult
+Sema::CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK,
+ SourceLocation KWLoc, const CXXScopeSpec &SS,
+ IdentifierInfo *Name, SourceLocation NameLoc,
+ AttributeList *Attr,
+ TemplateParameterList *TemplateParams,
+ AccessSpecifier AS) {
+ assert(TemplateParams && TemplateParams->size() > 0 &&
+ "No template parameters");
+ assert(TUK != TUK_Reference && "Can only declare or define class templates");
+ bool Invalid = false;
+
+ // Check that we can declare a template here.
+ if (CheckTemplateDeclScope(S, TemplateParams))
+ return true;
+
+ TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec);
+ assert(Kind != TagDecl::TK_enum && "can't build template of enumerated type");
+
+ // There is no such thing as an unnamed class template.
+ if (!Name) {
+ Diag(KWLoc, diag::err_template_unnamed_class);
+ return true;
+ }
+
+ // Find any previous declaration with this name.
+ DeclContext *SemanticContext;
+ LookupResult Previous(*this, Name, NameLoc, LookupOrdinaryName,
+ ForRedeclaration);
+ if (SS.isNotEmpty() && !SS.isInvalid()) {
+ if (RequireCompleteDeclContext(SS))
+ return true;
+
+ SemanticContext = computeDeclContext(SS, true);
+ if (!SemanticContext) {
+ // FIXME: Produce a reasonable diagnostic here
+ return true;
+ }
+
+ LookupQualifiedName(Previous, SemanticContext);
+ } else {
+ SemanticContext = CurContext;
+ LookupName(Previous, S);
+ }
+
+ assert(!Previous.isAmbiguous() && "Ambiguity in class template redecl?");
+ NamedDecl *PrevDecl = 0;
+ if (Previous.begin() != Previous.end())
+ PrevDecl = *Previous.begin();
+
+ // If there is a previous declaration with the same name, check
+ // whether this is a valid redeclaration.
+ ClassTemplateDecl *PrevClassTemplate
+ = dyn_cast_or_null<ClassTemplateDecl>(PrevDecl);
+
+ // We may have found the injected-class-name of a class template,
+ // class template partial specialization, or class template specialization.
+ // In these cases, grab the template that is being defined or specialized.
+ if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) &&
+ cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) {
+ PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext());
+ PrevClassTemplate
+ = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate();
+ if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) {
+ PrevClassTemplate
+ = cast<ClassTemplateSpecializationDecl>(PrevDecl)
+ ->getSpecializedTemplate();
+ }
+ }
+
+ if (TUK == TUK_Friend) {
+ // C++ [namespace.memdef]p3:
+ // [...] When looking for a prior declaration of a class or a function
+ // declared as a friend, and when the name of the friend class or
+ // function is neither a qualified name nor a template-id, scopes outside
+ // the innermost enclosing namespace scope are not considered.
+ DeclContext *OutermostContext = CurContext;
+ while (!OutermostContext->isFileContext())
+ OutermostContext = OutermostContext->getLookupParent();
+
+ if (PrevDecl &&
+ (OutermostContext->Equals(PrevDecl->getDeclContext()) ||
+ OutermostContext->Encloses(PrevDecl->getDeclContext()))) {
+ SemanticContext = PrevDecl->getDeclContext();
+ } else {
+ // Declarations in outer scopes don't matter. However, the outermost
+ // context we computed is the semantic context for our new
+ // declaration.
+ PrevDecl = PrevClassTemplate = 0;
+ SemanticContext = OutermostContext;
+ }
+
+ if (CurContext->isDependentContext()) {
+ // If this is a dependent context, we don't want to link the friend
+ // class template to the template in scope, because that would perform
+ // checking of the template parameter lists that can't be performed
+ // until the outer context is instantiated.
+ PrevDecl = PrevClassTemplate = 0;
+ }
+ } else if (PrevDecl && !isDeclInScope(PrevDecl, SemanticContext, S))
+ PrevDecl = PrevClassTemplate = 0;
+
+ if (PrevClassTemplate) {
+ // Ensure that the template parameter lists are compatible.
+ if (!TemplateParameterListsAreEqual(TemplateParams,
+ PrevClassTemplate->getTemplateParameters(),
+ /*Complain=*/true,
+ TPL_TemplateMatch))
+ return true;
+
+ // C++ [temp.class]p4:
+ // In a redeclaration, partial specialization, explicit
+ // specialization or explicit instantiation of a class template,
+ // the class-key shall agree in kind with the original class
+ // template declaration (7.1.5.3).
+ RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl();
+ if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind, KWLoc, *Name)) {
+ Diag(KWLoc, diag::err_use_with_wrong_tag)
+ << Name
+ << CodeModificationHint::CreateReplacement(KWLoc,
+ PrevRecordDecl->getKindName());
+ Diag(PrevRecordDecl->getLocation(), diag::note_previous_use);
+ Kind = PrevRecordDecl->getTagKind();
+ }
+
+ // Check for redefinition of this class template.
+ if (TUK == TUK_Definition) {
+ if (TagDecl *Def = PrevRecordDecl->getDefinition(Context)) {
+ Diag(NameLoc, diag::err_redefinition) << Name;
+ Diag(Def->getLocation(), diag::note_previous_definition);
+ // FIXME: Would it make sense to try to "forget" the previous
+ // definition, as part of error recovery?
+ return true;
+ }
+ }
+ } else if (PrevDecl && PrevDecl->isTemplateParameter()) {
+ // Maybe we will complain about the shadowed template parameter.
+ DiagnoseTemplateParameterShadow(NameLoc, PrevDecl);
+ // Just pretend that we didn't see the previous declaration.
+ PrevDecl = 0;
+ } else if (PrevDecl) {
+ // C++ [temp]p5:
+ // A class template shall not have the same name as any other
+ // template, class, function, object, enumeration, enumerator,
+ // namespace, or type in the same scope (3.3), except as specified
+ // in (14.5.4).
+ Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
+ Diag(PrevDecl->getLocation(), diag::note_previous_definition);
+ return true;
+ }
+
+ // Check the template parameter list of this declaration, possibly
+ // merging in the template parameter list from the previous class
+ // template declaration.
+ if (CheckTemplateParameterList(TemplateParams,
+ PrevClassTemplate? PrevClassTemplate->getTemplateParameters() : 0,
+ TPC_ClassTemplate))
+ Invalid = true;
+
+ // FIXME: If we had a scope specifier, we better have a previous template
+ // declaration!
+
+ CXXRecordDecl *NewClass =
+ CXXRecordDecl::Create(Context, Kind, SemanticContext, NameLoc, Name, KWLoc,
+ PrevClassTemplate?
+ PrevClassTemplate->getTemplatedDecl() : 0,
+ /*DelayTypeCreation=*/true);
+
+ ClassTemplateDecl *NewTemplate
+ = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc,
+ DeclarationName(Name), TemplateParams,
+ NewClass, PrevClassTemplate);
+ NewClass->setDescribedClassTemplate(NewTemplate);
+
+ // Build the type for the class template declaration now.
+ QualType T =
+ Context.getTypeDeclType(NewClass,
+ PrevClassTemplate?
+ PrevClassTemplate->getTemplatedDecl() : 0);
+ assert(T->isDependentType() && "Class template type is not dependent?");
+ (void)T;
+
+ // If we are providing an explicit specialization of a member that is a
+ // class template, make a note of that.
+ if (PrevClassTemplate &&
+ PrevClassTemplate->getInstantiatedFromMemberTemplate())
+ PrevClassTemplate->setMemberSpecialization();
+
+ // Set the access specifier.
+ if (!Invalid && TUK != TUK_Friend)
+ SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS);
+
+ // Set the lexical context of these templates
+ NewClass->setLexicalDeclContext(CurContext);
+ NewTemplate->setLexicalDeclContext(CurContext);
+
+ if (TUK == TUK_Definition)
+ NewClass->startDefinition();
+
+ if (Attr)
+ ProcessDeclAttributeList(S, NewClass, Attr);
+
+ if (TUK != TUK_Friend)
+ PushOnScopeChains(NewTemplate, S);
+ else {
+ if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) {
+ NewTemplate->setAccess(PrevClassTemplate->getAccess());
+ NewClass->setAccess(PrevClassTemplate->getAccess());
+ }
+
+ NewTemplate->setObjectOfFriendDecl(/* PreviouslyDeclared = */
+ PrevClassTemplate != NULL);
+
+ // Friend templates are visible in fairly strange ways.
+ if (!CurContext->isDependentContext()) {
+ DeclContext *DC = SemanticContext->getLookupContext();
+ DC->makeDeclVisibleInContext(NewTemplate, /* Recoverable = */ false);
+ if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
+ PushOnScopeChains(NewTemplate, EnclosingScope,
+ /* AddToContext = */ false);
+ }
+
+ FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
+ NewClass->getLocation(),
+ NewTemplate,
+ /*FIXME:*/NewClass->getLocation());
+ Friend->setAccess(AS_public);
+ CurContext->addDecl(Friend);
+ }
+
+ if (Invalid) {
+ NewTemplate->setInvalidDecl();
+ NewClass->setInvalidDecl();
+ }
+ return DeclPtrTy::make(NewTemplate);
+}
+
+/// \brief Diagnose the presence of a default template argument on a
+/// template parameter, which is ill-formed in certain contexts.
+///
+/// \returns true if the default template argument should be dropped.
+static bool DiagnoseDefaultTemplateArgument(Sema &S,
+ Sema::TemplateParamListContext TPC,
+ SourceLocation ParamLoc,
+ SourceRange DefArgRange) {
+ switch (TPC) {
+ case Sema::TPC_ClassTemplate:
+ return false;
+
+ case Sema::TPC_FunctionTemplate:
+ // C++ [temp.param]p9:
+ // A default template-argument shall not be specified in a
+ // function template declaration or a function template
+ // definition [...]
+ // (This sentence is not in C++0x, per DR226).
+ if (!S.getLangOptions().CPlusPlus0x)
+ S.Diag(ParamLoc,
+ diag::err_template_parameter_default_in_function_template)
+ << DefArgRange;
+ return false;
+
+ case Sema::TPC_ClassTemplateMember:
+ // C++0x [temp.param]p9:
+ // A default template-argument shall not be specified in the
+ // template-parameter-lists of the definition of a member of a
+ // class template that appears outside of the member's class.
+ S.Diag(ParamLoc, diag::err_template_parameter_default_template_member)
+ << DefArgRange;
+ return true;
+
+ case Sema::TPC_FriendFunctionTemplate:
+ // C++ [temp.param]p9:
+ // A default template-argument shall not be specified in a
+ // friend template declaration.
+ S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template)
+ << DefArgRange;
+ return true;
+
+ // FIXME: C++0x [temp.param]p9 allows default template-arguments
+ // for friend function templates if there is only a single
+ // declaration (and it is a definition). Strange!
+ }
+
+ return false;
+}
+
+/// \brief Checks the validity of a template parameter list, possibly
+/// considering the template parameter list from a previous
+/// declaration.
+///
+/// If an "old" template parameter list is provided, it must be
+/// equivalent (per TemplateParameterListsAreEqual) to the "new"
+/// template parameter list.
+///
+/// \param NewParams Template parameter list for a new template
+/// declaration. This template parameter list will be updated with any
+/// default arguments that are carried through from the previous
+/// template parameter list.
+///
+/// \param OldParams If provided, template parameter list from a
+/// previous declaration of the same template. Default template
+/// arguments will be merged from the old template parameter list to
+/// the new template parameter list.
+///
+/// \param TPC Describes the context in which we are checking the given
+/// template parameter list.
+///
+/// \returns true if an error occurred, false otherwise.
+bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams,
+ TemplateParameterList *OldParams,
+ TemplateParamListContext TPC) {
+ bool Invalid = false;
+
+ // C++ [temp.param]p10:
+ // The set of default template-arguments available for use with a
+ // template declaration or definition is obtained by merging the
+ // default arguments from the definition (if in scope) and all
+ // declarations in scope in the same way default function
+ // arguments are (8.3.6).
+ bool SawDefaultArgument = false;
+ SourceLocation PreviousDefaultArgLoc;
+
+ bool SawParameterPack = false;
+ SourceLocation ParameterPackLoc;
+
+ // Dummy initialization to avoid warnings.
+ TemplateParameterList::iterator OldParam = NewParams->end();
+ if (OldParams)
+ OldParam = OldParams->begin();
+
+ for (TemplateParameterList::iterator NewParam = NewParams->begin(),
+ NewParamEnd = NewParams->end();
+ NewParam != NewParamEnd; ++NewParam) {
+ // Variables used to diagnose redundant default arguments
+ bool RedundantDefaultArg = false;
+ SourceLocation OldDefaultLoc;
+ SourceLocation NewDefaultLoc;
+
+ // Variables used to diagnose missing default arguments
+ bool MissingDefaultArg = false;
+
+ // C++0x [temp.param]p11:
+ // If a template parameter of a class template is a template parameter pack,
+ // it must be the last template parameter.
+ if (SawParameterPack) {
+ Diag(ParameterPackLoc,
+ diag::err_template_param_pack_must_be_last_template_parameter);
+ Invalid = true;
+ }
+
+ if (TemplateTypeParmDecl *NewTypeParm
+ = dyn_cast<TemplateTypeParmDecl>(*NewParam)) {
+ // Check the presence of a default argument here.
+ if (NewTypeParm->hasDefaultArgument() &&
+ DiagnoseDefaultTemplateArgument(*this, TPC,
+ NewTypeParm->getLocation(),
+ NewTypeParm->getDefaultArgumentInfo()->getTypeLoc()
+ .getFullSourceRange()))
+ NewTypeParm->removeDefaultArgument();
+
+ // Merge default arguments for template type parameters.
+ TemplateTypeParmDecl *OldTypeParm
+ = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : 0;
+
+ if (NewTypeParm->isParameterPack()) {
+ assert(!NewTypeParm->hasDefaultArgument() &&
+ "Parameter packs can't have a default argument!");
+ SawParameterPack = true;
+ ParameterPackLoc = NewTypeParm->getLocation();
+ } else if (OldTypeParm && OldTypeParm->hasDefaultArgument() &&
+ NewTypeParm->hasDefaultArgument()) {
+ OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc();
+ NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc();
+ SawDefaultArgument = true;
+ RedundantDefaultArg = true;
+ PreviousDefaultArgLoc = NewDefaultLoc;
+ } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) {
+ // Merge the default argument from the old declaration to the
+ // new declaration.
+ SawDefaultArgument = true;
+ NewTypeParm->setDefaultArgument(OldTypeParm->getDefaultArgumentInfo(),
+ true);
+ PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc();
+ } else if (NewTypeParm->hasDefaultArgument()) {
+ SawDefaultArgument = true;
+ PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc();
+ } else if (SawDefaultArgument)
+ MissingDefaultArg = true;
+ } else if (NonTypeTemplateParmDecl *NewNonTypeParm
+ = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) {
+ // Check the presence of a default argument here.
+ if (NewNonTypeParm->hasDefaultArgument() &&
+ DiagnoseDefaultTemplateArgument(*this, TPC,
+ NewNonTypeParm->getLocation(),
+ NewNonTypeParm->getDefaultArgument()->getSourceRange())) {
+ NewNonTypeParm->getDefaultArgument()->Destroy(Context);
+ NewNonTypeParm->setDefaultArgument(0);
+ }
+
+ // Merge default arguments for non-type template parameters
+ NonTypeTemplateParmDecl *OldNonTypeParm
+ = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : 0;
+ if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument() &&
+ NewNonTypeParm->hasDefaultArgument()) {
+ OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc();
+ NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc();
+ SawDefaultArgument = true;
+ RedundantDefaultArg = true;
+ PreviousDefaultArgLoc = NewDefaultLoc;
+ } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) {
+ // Merge the default argument from the old declaration to the
+ // new declaration.
+ SawDefaultArgument = true;
+ // FIXME: We need to create a new kind of "default argument"
+ // expression that points to a previous template template
+ // parameter.
+ NewNonTypeParm->setDefaultArgument(
+ OldNonTypeParm->getDefaultArgument());
+ PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc();
+ } else if (NewNonTypeParm->hasDefaultArgument()) {
+ SawDefaultArgument = true;
+ PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc();
+ } else if (SawDefaultArgument)
+ MissingDefaultArg = true;
+ } else {
+ // Check the presence of a default argument here.
+ TemplateTemplateParmDecl *NewTemplateParm
+ = cast<TemplateTemplateParmDecl>(*NewParam);
+ if (NewTemplateParm->hasDefaultArgument() &&
+ DiagnoseDefaultTemplateArgument(*this, TPC,
+ NewTemplateParm->getLocation(),
+ NewTemplateParm->getDefaultArgument().getSourceRange()))
+ NewTemplateParm->setDefaultArgument(TemplateArgumentLoc());
+
+ // Merge default arguments for template template parameters
+ TemplateTemplateParmDecl *OldTemplateParm
+ = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : 0;
+ if (OldTemplateParm && OldTemplateParm->hasDefaultArgument() &&
+ NewTemplateParm->hasDefaultArgument()) {
+ OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation();
+ NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation();
+ SawDefaultArgument = true;
+ RedundantDefaultArg = true;
+ PreviousDefaultArgLoc = NewDefaultLoc;
+ } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) {
+ // Merge the default argument from the old declaration to the
+ // new declaration.
+ SawDefaultArgument = true;
+ // FIXME: We need to create a new kind of "default argument" expression
+ // that points to a previous template template parameter.
+ NewTemplateParm->setDefaultArgument(
+ OldTemplateParm->getDefaultArgument());
+ PreviousDefaultArgLoc
+ = OldTemplateParm->getDefaultArgument().getLocation();
+ } else if (NewTemplateParm->hasDefaultArgument()) {
+ SawDefaultArgument = true;
+ PreviousDefaultArgLoc
+ = NewTemplateParm->getDefaultArgument().getLocation();
+ } else if (SawDefaultArgument)
+ MissingDefaultArg = true;
+ }
+
+ if (RedundantDefaultArg) {
+ // C++ [temp.param]p12:
+ // A template-parameter shall not be given default arguments
+ // by two different declarations in the same scope.
+ Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition);
+ Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg);
+ Invalid = true;
+ } else if (MissingDefaultArg) {
+ // C++ [temp.param]p11:
+ // If a template-parameter has a default template-argument,
+ // all subsequent template-parameters shall have a default
+ // template-argument supplied.
+ Diag((*NewParam)->getLocation(),
+ diag::err_template_param_default_arg_missing);
+ Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg);
+ Invalid = true;
+ }
+
+ // If we have an old template parameter list that we're merging
+ // in, move on to the next parameter.
+ if (OldParams)
+ ++OldParam;
+ }
+
+ return Invalid;
+}
+
+/// \brief Match the given template parameter lists to the given scope
+/// specifier, returning the template parameter list that applies to the
+/// name.
+///
+/// \param DeclStartLoc the start of the declaration that has a scope
+/// specifier or a template parameter list.
+///
+/// \param SS the scope specifier that will be matched to the given template
+/// parameter lists. This scope specifier precedes a qualified name that is
+/// being declared.
+///
+/// \param ParamLists the template parameter lists, from the outermost to the
+/// innermost template parameter lists.
+///
+/// \param NumParamLists the number of template parameter lists in ParamLists.
+///
+/// \param IsExplicitSpecialization will be set true if the entity being
+/// declared is an explicit specialization, false otherwise.
+///
+/// \returns the template parameter list, if any, that corresponds to the
+/// name that is preceded by the scope specifier @p SS. This template
+/// parameter list may be have template parameters (if we're declaring a
+/// template) or may have no template parameters (if we're declaring a
+/// template specialization), or may be NULL (if we were's declaring isn't
+/// itself a template).
+TemplateParameterList *
+Sema::MatchTemplateParametersToScopeSpecifier(SourceLocation DeclStartLoc,
+ const CXXScopeSpec &SS,
+ TemplateParameterList **ParamLists,
+ unsigned NumParamLists,
+ bool &IsExplicitSpecialization) {
+ IsExplicitSpecialization = false;
+
+ // Find the template-ids that occur within the nested-name-specifier. These
+ // template-ids will match up with the template parameter lists.
+ llvm::SmallVector<const TemplateSpecializationType *, 4>
+ TemplateIdsInSpecifier;
+ llvm::SmallVector<ClassTemplateSpecializationDecl *, 4>
+ ExplicitSpecializationsInSpecifier;
+ for (NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
+ NNS; NNS = NNS->getPrefix()) {
+ const Type *T = NNS->getAsType();
+ if (!T) break;
+
+ // C++0x [temp.expl.spec]p17:
+ // A member or a member template may be nested within many
+ // enclosing class templates. In an explicit specialization for
+ // such a member, the member declaration shall be preceded by a
+ // template<> for each enclosing class template that is
+ // explicitly specialized.
+ // We interpret this as forbidding typedefs of template
+ // specializations in the scope specifiers of out-of-line decls.
+ if (const TypedefType *TT = dyn_cast<TypedefType>(T)) {
+ const Type *UnderlyingT = TT->LookThroughTypedefs().getTypePtr();
+ if (isa<TemplateSpecializationType>(UnderlyingT))
+ // FIXME: better source location information.
+ Diag(DeclStartLoc, diag::err_typedef_in_def_scope) << QualType(T,0);
+ T = UnderlyingT;
+ }
+
+ if (const TemplateSpecializationType *SpecType
+ = dyn_cast<TemplateSpecializationType>(T)) {
+ TemplateDecl *Template = SpecType->getTemplateName().getAsTemplateDecl();
+ if (!Template)
+ continue; // FIXME: should this be an error? probably...
+
+ if (const RecordType *Record = SpecType->getAs<RecordType>()) {
+ ClassTemplateSpecializationDecl *SpecDecl
+ = cast<ClassTemplateSpecializationDecl>(Record->getDecl());
+ // If the nested name specifier refers to an explicit specialization,
+ // we don't need a template<> header.
+ if (SpecDecl->getSpecializationKind() == TSK_ExplicitSpecialization) {
+ ExplicitSpecializationsInSpecifier.push_back(SpecDecl);
+ continue;
+ }
+ }
+
+ TemplateIdsInSpecifier.push_back(SpecType);
+ }
+ }
+
+ // Reverse the list of template-ids in the scope specifier, so that we can
+ // more easily match up the template-ids and the template parameter lists.
+ std::reverse(TemplateIdsInSpecifier.begin(), TemplateIdsInSpecifier.end());
+
+ SourceLocation FirstTemplateLoc = DeclStartLoc;
+ if (NumParamLists)
+ FirstTemplateLoc = ParamLists[0]->getTemplateLoc();
+
+ // Match the template-ids found in the specifier to the template parameter
+ // lists.
+ unsigned Idx = 0;
+ for (unsigned NumTemplateIds = TemplateIdsInSpecifier.size();
+ Idx != NumTemplateIds; ++Idx) {
+ QualType TemplateId = QualType(TemplateIdsInSpecifier[Idx], 0);
+ bool DependentTemplateId = TemplateId->isDependentType();
+ if (Idx >= NumParamLists) {
+ // We have a template-id without a corresponding template parameter
+ // list.
+ if (DependentTemplateId) {
+ // FIXME: the location information here isn't great.
+ Diag(SS.getRange().getBegin(),
+ diag::err_template_spec_needs_template_parameters)
+ << TemplateId
+ << SS.getRange();
+ } else {
+ Diag(SS.getRange().getBegin(), diag::err_template_spec_needs_header)
+ << SS.getRange()
+ << CodeModificationHint::CreateInsertion(FirstTemplateLoc,
+ "template<> ");
+ IsExplicitSpecialization = true;
+ }
+ return 0;
+ }
+
+ // Check the template parameter list against its corresponding template-id.
+ if (DependentTemplateId) {
+ TemplateDecl *Template
+ = TemplateIdsInSpecifier[Idx]->getTemplateName().getAsTemplateDecl();
+
+ if (ClassTemplateDecl *ClassTemplate
+ = dyn_cast<ClassTemplateDecl>(Template)) {
+ TemplateParameterList *ExpectedTemplateParams = 0;
+ // Is this template-id naming the primary template?
+ if (Context.hasSameType(TemplateId,
+ ClassTemplate->getInjectedClassNameType(Context)))
+ ExpectedTemplateParams = ClassTemplate->getTemplateParameters();
+ // ... or a partial specialization?
+ else if (ClassTemplatePartialSpecializationDecl *PartialSpec
+ = ClassTemplate->findPartialSpecialization(TemplateId))
+ ExpectedTemplateParams = PartialSpec->getTemplateParameters();
+
+ if (ExpectedTemplateParams)
+ TemplateParameterListsAreEqual(ParamLists[Idx],
+ ExpectedTemplateParams,
+ true, TPL_TemplateMatch);
+ }
+
+ CheckTemplateParameterList(ParamLists[Idx], 0, TPC_ClassTemplateMember);
+ } else if (ParamLists[Idx]->size() > 0)
+ Diag(ParamLists[Idx]->getTemplateLoc(),
+ diag::err_template_param_list_matches_nontemplate)
+ << TemplateId
+ << ParamLists[Idx]->getSourceRange();
+ else
+ IsExplicitSpecialization = true;
+ }
+
+ // If there were at least as many template-ids as there were template
+ // parameter lists, then there are no template parameter lists remaining for
+ // the declaration itself.
+ if (Idx >= NumParamLists)
+ return 0;
+
+ // If there were too many template parameter lists, complain about that now.
+ if (Idx != NumParamLists - 1) {
+ while (Idx < NumParamLists - 1) {
+ bool isExplicitSpecHeader = ParamLists[Idx]->size() == 0;
+ Diag(ParamLists[Idx]->getTemplateLoc(),
+ isExplicitSpecHeader? diag::warn_template_spec_extra_headers
+ : diag::err_template_spec_extra_headers)
+ << SourceRange(ParamLists[Idx]->getTemplateLoc(),
+ ParamLists[Idx]->getRAngleLoc());
+
+ if (isExplicitSpecHeader && !ExplicitSpecializationsInSpecifier.empty()) {
+ Diag(ExplicitSpecializationsInSpecifier.back()->getLocation(),
+ diag::note_explicit_template_spec_does_not_need_header)
+ << ExplicitSpecializationsInSpecifier.back();
+ ExplicitSpecializationsInSpecifier.pop_back();
+ }
+
+ ++Idx;
+ }
+ }
+
+ // Return the last template parameter list, which corresponds to the
+ // entity being declared.
+ return ParamLists[NumParamLists - 1];
+}
+
+QualType Sema::CheckTemplateIdType(TemplateName Name,
+ SourceLocation TemplateLoc,
+ const TemplateArgumentListInfo &TemplateArgs) {
+ TemplateDecl *Template = Name.getAsTemplateDecl();
+ if (!Template) {
+ // The template name does not resolve to a template, so we just
+ // build a dependent template-id type.
+ return Context.getTemplateSpecializationType(Name, TemplateArgs);
+ }
+
+ // Check that the template argument list is well-formed for this
+ // template.
+ TemplateArgumentListBuilder Converted(Template->getTemplateParameters(),
+ TemplateArgs.size());
+ if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs,
+ false, Converted))
+ return QualType();
+
+ assert((Converted.structuredSize() ==
+ Template->getTemplateParameters()->size()) &&
+ "Converted template argument list is too short!");
+
+ QualType CanonType;
+
+ if (Name.isDependent() ||
+ TemplateSpecializationType::anyDependentTemplateArguments(
+ TemplateArgs)) {
+ // This class template specialization is a dependent
+ // type. Therefore, its canonical type is another class template
+ // specialization type that contains all of the converted
+ // arguments in canonical form. This ensures that, e.g., A<T> and
+ // A<T, T> have identical types when A is declared as:
+ //
+ // template<typename T, typename U = T> struct A;
+ TemplateName CanonName = Context.getCanonicalTemplateName(Name);
+ CanonType = Context.getTemplateSpecializationType(CanonName,
+ Converted.getFlatArguments(),
+ Converted.flatSize());
+
+ // FIXME: CanonType is not actually the canonical type, and unfortunately
+ // it is a TemplateSpecializationType that we will never use again.
+ // In the future, we need to teach getTemplateSpecializationType to only
+ // build the canonical type and return that to us.
+ CanonType = Context.getCanonicalType(CanonType);
+ } else if (ClassTemplateDecl *ClassTemplate
+ = dyn_cast<ClassTemplateDecl>(Template)) {
+ // Find the class template specialization declaration that
+ // corresponds to these arguments.
+ llvm::FoldingSetNodeID ID;
+ ClassTemplateSpecializationDecl::Profile(ID,
+ Converted.getFlatArguments(),
+ Converted.flatSize(),
+ Context);
+ void *InsertPos = 0;
+ ClassTemplateSpecializationDecl *Decl
+ = ClassTemplate->getSpecializations().FindNodeOrInsertPos(ID, InsertPos);
+ if (!Decl) {
+ // This is the first time we have referenced this class template
+ // specialization. Create the canonical declaration and add it to
+ // the set of specializations.
+ Decl = ClassTemplateSpecializationDecl::Create(Context,
+ ClassTemplate->getDeclContext(),
+ ClassTemplate->getLocation(),
+ ClassTemplate,
+ Converted, 0);
+ ClassTemplate->getSpecializations().InsertNode(Decl, InsertPos);
+ Decl->setLexicalDeclContext(CurContext);
+ }
+
+ CanonType = Context.getTypeDeclType(Decl);
+ }
+
+ // Build the fully-sugared type for this class template
+ // specialization, which refers back to the class template
+ // specialization we created or found.
+ return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
+}
+
+Action::TypeResult
+Sema::ActOnTemplateIdType(TemplateTy TemplateD, SourceLocation TemplateLoc,
+ SourceLocation LAngleLoc,
+ ASTTemplateArgsPtr TemplateArgsIn,
+ SourceLocation RAngleLoc) {
+ TemplateName Template = TemplateD.getAsVal<TemplateName>();
+
+ // Translate the parser's template argument list in our AST format.
+ TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
+ translateTemplateArguments(TemplateArgsIn, TemplateArgs);
+
+ QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
+ TemplateArgsIn.release();
+
+ if (Result.isNull())
+ return true;
+
+ TypeSourceInfo *DI = Context.CreateTypeSourceInfo(Result);
+ TemplateSpecializationTypeLoc TL
+ = cast<TemplateSpecializationTypeLoc>(DI->getTypeLoc());
+ TL.setTemplateNameLoc(TemplateLoc);
+ TL.setLAngleLoc(LAngleLoc);
+ TL.setRAngleLoc(RAngleLoc);
+ for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i)
+ TL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
+
+ return CreateLocInfoType(Result, DI).getAsOpaquePtr();
+}
+
+Sema::TypeResult Sema::ActOnTagTemplateIdType(TypeResult TypeResult,
+ TagUseKind TUK,
+ DeclSpec::TST TagSpec,
+ SourceLocation TagLoc) {
+ if (TypeResult.isInvalid())
+ return Sema::TypeResult();
+
+ // FIXME: preserve source info, ideally without copying the DI.
+ TypeSourceInfo *DI;
+ QualType Type = GetTypeFromParser(TypeResult.get(), &DI);
+
+ // Verify the tag specifier.
+ TagDecl::TagKind TagKind = TagDecl::getTagKindForTypeSpec(TagSpec);
+
+ if (const RecordType *RT = Type->getAs<RecordType>()) {
+ RecordDecl *D = RT->getDecl();
+
+ IdentifierInfo *Id = D->getIdentifier();
+ assert(Id && "templated class must have an identifier");
+
+ if (!isAcceptableTagRedeclaration(D, TagKind, TagLoc, *Id)) {
+ Diag(TagLoc, diag::err_use_with_wrong_tag)
+ << Type
+ << CodeModificationHint::CreateReplacement(SourceRange(TagLoc),
+ D->getKindName());
+ Diag(D->getLocation(), diag::note_previous_use);
+ }
+ }
+
+ QualType ElabType = Context.getElaboratedType(Type, TagKind);
+
+ return ElabType.getAsOpaquePtr();
+}
+
+Sema::OwningExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
+ LookupResult &R,
+ bool RequiresADL,
+ const TemplateArgumentListInfo &TemplateArgs) {
+ // FIXME: Can we do any checking at this point? I guess we could check the
+ // template arguments that we have against the template name, if the template
+ // name refers to a single template. That's not a terribly common case,
+ // though.
+
+ // These should be filtered out by our callers.
+ assert(!R.empty() && "empty lookup results when building templateid");
+ assert(!R.isAmbiguous() && "ambiguous lookup when building templateid");
+
+ NestedNameSpecifier *Qualifier = 0;
+ SourceRange QualifierRange;
+ if (SS.isSet()) {
+ Qualifier = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
+ QualifierRange = SS.getRange();
+ }
+
+ // We don't want lookup warnings at this point.
+ R.suppressDiagnostics();
+
+ bool Dependent
+ = UnresolvedLookupExpr::ComputeDependence(R.begin(), R.end(),
+ &TemplateArgs);
+ UnresolvedLookupExpr *ULE
+ = UnresolvedLookupExpr::Create(Context, Dependent, R.getNamingClass(),
+ Qualifier, QualifierRange,
+ R.getLookupName(), R.getNameLoc(),
+ RequiresADL, TemplateArgs);
+ ULE->addDecls(R.begin(), R.end());
+
+ return Owned(ULE);
+}
+
+// We actually only call this from template instantiation.
+Sema::OwningExprResult
+Sema::BuildQualifiedTemplateIdExpr(const CXXScopeSpec &SS,
+ DeclarationName Name,
+ SourceLocation NameLoc,
+ const TemplateArgumentListInfo &TemplateArgs) {
+ DeclContext *DC;
+ if (!(DC = computeDeclContext(SS, false)) ||
+ DC->isDependentContext() ||
+ RequireCompleteDeclContext(SS))
+ return BuildDependentDeclRefExpr(SS, Name, NameLoc, &TemplateArgs);
+
+ LookupResult R(*this, Name, NameLoc, LookupOrdinaryName);
+ LookupTemplateName(R, (Scope*) 0, SS, QualType(), /*Entering*/ false);
+
+ if (R.isAmbiguous())
+ return ExprError();
+
+ if (R.empty()) {
+ Diag(NameLoc, diag::err_template_kw_refers_to_non_template)
+ << Name << SS.getRange();
+ return ExprError();
+ }
+
+ if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) {
+ Diag(NameLoc, diag::err_template_kw_refers_to_class_template)
+ << (NestedNameSpecifier*) SS.getScopeRep() << Name << SS.getRange();
+ Diag(Temp->getLocation(), diag::note_referenced_class_template);
+ return ExprError();
+ }
+
+ return BuildTemplateIdExpr(SS, R, /* ADL */ false, TemplateArgs);
+}
+
+/// \brief Form a dependent template name.
+///
+/// This action forms a dependent template name given the template
+/// name and its (presumably dependent) scope specifier. For
+/// example, given "MetaFun::template apply", the scope specifier \p
+/// SS will be "MetaFun::", \p TemplateKWLoc contains the location
+/// of the "template" keyword, and "apply" is the \p Name.
+Sema::TemplateTy
+Sema::ActOnDependentTemplateName(SourceLocation TemplateKWLoc,
+ const CXXScopeSpec &SS,
+ UnqualifiedId &Name,
+ TypeTy *ObjectType,
+ bool EnteringContext) {
+ DeclContext *LookupCtx = 0;
+ if (SS.isSet())
+ LookupCtx = computeDeclContext(SS, EnteringContext);
+ if (!LookupCtx && ObjectType)
+ LookupCtx = computeDeclContext(QualType::getFromOpaquePtr(ObjectType));
+ if (LookupCtx) {
+ // C++0x [temp.names]p5:
+ // If a name prefixed by the keyword template is not the name of
+ // a template, the program is ill-formed. [Note: the keyword
+ // template may not be applied to non-template members of class
+ // templates. -end note ] [ Note: as is the case with the
+ // typename prefix, the template prefix is allowed in cases
+ // where it is not strictly necessary; i.e., when the
+ // nested-name-specifier or the expression on the left of the ->
+ // or . is not dependent on a template-parameter, or the use
+ // does not appear in the scope of a template. -end note]
+ //
+ // Note: C++03 was more strict here, because it banned the use of
+ // the "template" keyword prior to a template-name that was not a
+ // dependent name. C++ DR468 relaxed this requirement (the
+ // "template" keyword is now permitted). We follow the C++0x
+ // rules, even in C++03 mode, retroactively applying the DR.
+ TemplateTy Template;
+ TemplateNameKind TNK = isTemplateName(0, SS, Name, ObjectType,
+ EnteringContext, Template);
+ if (TNK == TNK_Non_template && LookupCtx->isDependentContext() &&
+ isa<CXXRecordDecl>(LookupCtx) &&
+ cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases()) {
+ // This is a dependent template.
+ } else if (TNK == TNK_Non_template) {
+ Diag(Name.getSourceRange().getBegin(),
+ diag::err_template_kw_refers_to_non_template)
+ << GetNameFromUnqualifiedId(Name)
+ << Name.getSourceRange();
+ return TemplateTy();
+ } else {
+ // We found something; return it.
+ return Template;
+ }
+ }
+
+ NestedNameSpecifier *Qualifier
+ = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
+
+ switch (Name.getKind()) {
+ case UnqualifiedId::IK_Identifier:
+ return TemplateTy::make(Context.getDependentTemplateName(Qualifier,
+ Name.Identifier));
+
+ case UnqualifiedId::IK_OperatorFunctionId:
+ return TemplateTy::make(Context.getDependentTemplateName(Qualifier,
+ Name.OperatorFunctionId.Operator));
+
+ case UnqualifiedId::IK_LiteralOperatorId:
+ assert(false && "We don't support these; Parse shouldn't have allowed propagation");
+
+ default:
+ break;
+ }
+
+ Diag(Name.getSourceRange().getBegin(),
+ diag::err_template_kw_refers_to_non_template)
+ << GetNameFromUnqualifiedId(Name)
+ << Name.getSourceRange();
+ return TemplateTy();
+}
+
+bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
+ const TemplateArgumentLoc &AL,
+ TemplateArgumentListBuilder &Converted) {
+ const TemplateArgument &Arg = AL.getArgument();
+
+ // Check template type parameter.
+ if (Arg.getKind() != TemplateArgument::Type) {
+ // C++ [temp.arg.type]p1:
+ // A template-argument for a template-parameter which is a
+ // type shall be a type-id.
+
+ // We have a template type parameter but the template argument
+ // is not a type.
+ SourceRange SR = AL.getSourceRange();
+ Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR;
+ Diag(Param->getLocation(), diag::note_template_param_here);
+
+ return true;
+ }
+
+ if (CheckTemplateArgument(Param, AL.getTypeSourceInfo()))
+ return true;
+
+ // Add the converted template type argument.
+ Converted.Append(
+ TemplateArgument(Context.getCanonicalType(Arg.getAsType())));
+ return false;
+}
+
+/// \brief Substitute template arguments into the default template argument for
+/// the given template type parameter.
+///
+/// \param SemaRef the semantic analysis object for which we are performing
+/// the substitution.
+///
+/// \param Template the template that we are synthesizing template arguments
+/// for.
+///
+/// \param TemplateLoc the location of the template name that started the
+/// template-id we are checking.
+///
+/// \param RAngleLoc the location of the right angle bracket ('>') that
+/// terminates the template-id.
+///
+/// \param Param the template template parameter whose default we are
+/// substituting into.
+///
+/// \param Converted the list of template arguments provided for template
+/// parameters that precede \p Param in the template parameter list.
+///
+/// \returns the substituted template argument, or NULL if an error occurred.
+static TypeSourceInfo *
+SubstDefaultTemplateArgument(Sema &SemaRef,
+ TemplateDecl *Template,
+ SourceLocation TemplateLoc,
+ SourceLocation RAngleLoc,
+ TemplateTypeParmDecl *Param,
+ TemplateArgumentListBuilder &Converted) {
+ TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
+
+ // If the argument type is dependent, instantiate it now based
+ // on the previously-computed template arguments.
+ if (ArgType->getType()->isDependentType()) {
+ TemplateArgumentList TemplateArgs(SemaRef.Context, Converted,
+ /*TakeArgs=*/false);
+
+ MultiLevelTemplateArgumentList AllTemplateArgs
+ = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
+
+ Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
+ Template, Converted.getFlatArguments(),
+ Converted.flatSize(),
+ SourceRange(TemplateLoc, RAngleLoc));
+
+ ArgType = SemaRef.SubstType(ArgType, AllTemplateArgs,
+ Param->getDefaultArgumentLoc(),
+ Param->getDeclName());
+ }
+
+ return ArgType;
+}
+
+/// \brief Substitute template arguments into the default template argument for
+/// the given non-type template parameter.
+///
+/// \param SemaRef the semantic analysis object for which we are performing
+/// the substitution.
+///
+/// \param Template the template that we are synthesizing template arguments
+/// for.
+///
+/// \param TemplateLoc the location of the template name that started the
+/// template-id we are checking.
+///
+/// \param RAngleLoc the location of the right angle bracket ('>') that
+/// terminates the template-id.
+///
+/// \param Param the non-type template parameter whose default we are
+/// substituting into.
+///
+/// \param Converted the list of template arguments provided for template
+/// parameters that precede \p Param in the template parameter list.
+///
+/// \returns the substituted template argument, or NULL if an error occurred.
+static Sema::OwningExprResult
+SubstDefaultTemplateArgument(Sema &SemaRef,
+ TemplateDecl *Template,
+ SourceLocation TemplateLoc,
+ SourceLocation RAngleLoc,
+ NonTypeTemplateParmDecl *Param,
+ TemplateArgumentListBuilder &Converted) {
+ TemplateArgumentList TemplateArgs(SemaRef.Context, Converted,
+ /*TakeArgs=*/false);
+
+ MultiLevelTemplateArgumentList AllTemplateArgs
+ = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
+
+ Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
+ Template, Converted.getFlatArguments(),
+ Converted.flatSize(),
+ SourceRange(TemplateLoc, RAngleLoc));
+
+ return SemaRef.SubstExpr(Param->getDefaultArgument(), AllTemplateArgs);
+}
+
+/// \brief Substitute template arguments into the default template argument for
+/// the given template template parameter.
+///
+/// \param SemaRef the semantic analysis object for which we are performing
+/// the substitution.
+///
+/// \param Template the template that we are synthesizing template arguments
+/// for.
+///
+/// \param TemplateLoc the location of the template name that started the
+/// template-id we are checking.
+///
+/// \param RAngleLoc the location of the right angle bracket ('>') that
+/// terminates the template-id.
+///
+/// \param Param the template template parameter whose default we are
+/// substituting into.
+///
+/// \param Converted the list of template arguments provided for template
+/// parameters that precede \p Param in the template parameter list.
+///
+/// \returns the substituted template argument, or NULL if an error occurred.
+static TemplateName
+SubstDefaultTemplateArgument(Sema &SemaRef,
+ TemplateDecl *Template,
+ SourceLocation TemplateLoc,
+ SourceLocation RAngleLoc,
+ TemplateTemplateParmDecl *Param,
+ TemplateArgumentListBuilder &Converted) {
+ TemplateArgumentList TemplateArgs(SemaRef.Context, Converted,
+ /*TakeArgs=*/false);
+
+ MultiLevelTemplateArgumentList AllTemplateArgs
+ = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
+
+ Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
+ Template, Converted.getFlatArguments(),
+ Converted.flatSize(),
+ SourceRange(TemplateLoc, RAngleLoc));
+
+ return SemaRef.SubstTemplateName(
+ Param->getDefaultArgument().getArgument().getAsTemplate(),
+ Param->getDefaultArgument().getTemplateNameLoc(),
+ AllTemplateArgs);
+}
+
+/// \brief If the given template parameter has a default template
+/// argument, substitute into that default template argument and
+/// return the corresponding template argument.
+TemplateArgumentLoc
+Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
+ SourceLocation TemplateLoc,
+ SourceLocation RAngleLoc,
+ Decl *Param,
+ TemplateArgumentListBuilder &Converted) {
+ if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
+ if (!TypeParm->hasDefaultArgument())
+ return TemplateArgumentLoc();
+
+ TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
+ TemplateLoc,
+ RAngleLoc,
+ TypeParm,
+ Converted);
+ if (DI)
+ return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI);
+
+ return TemplateArgumentLoc();
+ }
+
+ if (NonTypeTemplateParmDecl *NonTypeParm
+ = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
+ if (!NonTypeParm->hasDefaultArgument())
+ return TemplateArgumentLoc();
+
+ OwningExprResult Arg = SubstDefaultTemplateArgument(*this, Template,
+ TemplateLoc,
+ RAngleLoc,
+ NonTypeParm,
+ Converted);
+ if (Arg.isInvalid())
+ return TemplateArgumentLoc();
+
+ Expr *ArgE = Arg.takeAs<Expr>();
+ return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE);
+ }
+
+ TemplateTemplateParmDecl *TempTempParm
+ = cast<TemplateTemplateParmDecl>(Param);
+ if (!TempTempParm->hasDefaultArgument())
+ return TemplateArgumentLoc();
+
+ TemplateName TName = SubstDefaultTemplateArgument(*this, Template,
+ TemplateLoc,
+ RAngleLoc,
+ TempTempParm,
+ Converted);
+ if (TName.isNull())
+ return TemplateArgumentLoc();
+
+ return TemplateArgumentLoc(TemplateArgument(TName),
+ TempTempParm->getDefaultArgument().getTemplateQualifierRange(),
+ TempTempParm->getDefaultArgument().getTemplateNameLoc());
+}
+
+/// \brief Check that the given template argument corresponds to the given
+/// template parameter.
+bool Sema::CheckTemplateArgument(NamedDecl *Param,
+ const TemplateArgumentLoc &Arg,
+ TemplateDecl *Template,
+ SourceLocation TemplateLoc,
+ SourceLocation RAngleLoc,
+ TemplateArgumentListBuilder &Converted) {
+ // Check template type parameters.
+ if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
+ return CheckTemplateTypeArgument(TTP, Arg, Converted);
+
+ // Check non-type template parameters.
+ if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) {
+ // Do substitution on the type of the non-type template parameter
+ // with the template arguments we've seen thus far.
+ QualType NTTPType = NTTP->getType();
+ if (NTTPType->isDependentType()) {
+ // Do substitution on the type of the non-type template parameter.
+ InstantiatingTemplate Inst(*this, TemplateLoc, Template,
+ NTTP, Converted.getFlatArguments(),
+ Converted.flatSize(),
+ SourceRange(TemplateLoc, RAngleLoc));
+
+ TemplateArgumentList TemplateArgs(Context, Converted,
+ /*TakeArgs=*/false);
+ NTTPType = SubstType(NTTPType,
+ MultiLevelTemplateArgumentList(TemplateArgs),
+ NTTP->getLocation(),
+ NTTP->getDeclName());
+ // If that worked, check the non-type template parameter type
+ // for validity.
+ if (!NTTPType.isNull())
+ NTTPType = CheckNonTypeTemplateParameterType(NTTPType,
+ NTTP->getLocation());
+ if (NTTPType.isNull())
+ return true;
+ }
+
+ switch (Arg.getArgument().getKind()) {
+ case TemplateArgument::Null:
+ assert(false && "Should never see a NULL template argument here");
+ return true;
+
+ case TemplateArgument::Expression: {
+ Expr *E = Arg.getArgument().getAsExpr();
+ TemplateArgument Result;
+ if (CheckTemplateArgument(NTTP, NTTPType, E, Result))
+ return true;
+
+ Converted.Append(Result);
+ break;
+ }
+
+ case TemplateArgument::Declaration:
+ case TemplateArgument::Integral:
+ // We've already checked this template argument, so just copy
+ // it to the list of converted arguments.
+ Converted.Append(Arg.getArgument());
+ break;
+
+ case TemplateArgument::Template:
+ // We were given a template template argument. It may not be ill-formed;
+ // see below.
+ if (DependentTemplateName *DTN
+ = Arg.getArgument().getAsTemplate().getAsDependentTemplateName()) {
+ // We have a template argument such as \c T::template X, which we
+ // parsed as a template template argument. However, since we now
+ // know that we need a non-type template argument, convert this
+ // template name into an expression.
+ Expr *E = DependentScopeDeclRefExpr::Create(Context,
+ DTN->getQualifier(),
+ Arg.getTemplateQualifierRange(),
+ DTN->getIdentifier(),
+ Arg.getTemplateNameLoc());
+
+ TemplateArgument Result;
+ if (CheckTemplateArgument(NTTP, NTTPType, E, Result))
+ return true;
+
+ Converted.Append(Result);
+ break;
+ }
+
+ // We have a template argument that actually does refer to a class
+ // template, template alias, or template template parameter, and
+ // therefore cannot be a non-type template argument.
+ Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr)
+ << Arg.getSourceRange();
+
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+
+ case TemplateArgument::Type: {
+ // We have a non-type template parameter but the template
+ // argument is a type.
+
+ // C++ [temp.arg]p2:
+ // In a template-argument, an ambiguity between a type-id and
+ // an expression is resolved to a type-id, regardless of the
+ // form of the corresponding template-parameter.
+ //
+ // We warn specifically about this case, since it can be rather
+ // confusing for users.
+ QualType T = Arg.getArgument().getAsType();
+ SourceRange SR = Arg.getSourceRange();
+ if (T->isFunctionType())
+ Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T;
+ else
+ Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR;
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ case TemplateArgument::Pack:
+ llvm_unreachable("Caller must expand template argument packs");
+ break;
+ }
+
+ return false;
+ }
+
+
+ // Check template template parameters.
+ TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param);
+
+ // Substitute into the template parameter list of the template
+ // template parameter, since previously-supplied template arguments
+ // may appear within the template template parameter.
+ {
+ // Set up a template instantiation context.
+ LocalInstantiationScope Scope(*this);
+ InstantiatingTemplate Inst(*this, TemplateLoc, Template,
+ TempParm, Converted.getFlatArguments(),
+ Converted.flatSize(),
+ SourceRange(TemplateLoc, RAngleLoc));
+
+ TemplateArgumentList TemplateArgs(Context, Converted,
+ /*TakeArgs=*/false);
+ TempParm = cast_or_null<TemplateTemplateParmDecl>(
+ SubstDecl(TempParm, CurContext,
+ MultiLevelTemplateArgumentList(TemplateArgs)));
+ if (!TempParm)
+ return true;
+
+ // FIXME: TempParam is leaked.
+ }
+
+ switch (Arg.getArgument().getKind()) {
+ case TemplateArgument::Null:
+ assert(false && "Should never see a NULL template argument here");
+ return true;
+
+ case TemplateArgument::Template:
+ if (CheckTemplateArgument(TempParm, Arg))
+ return true;
+
+ Converted.Append(Arg.getArgument());
+ break;
+
+ case TemplateArgument::Expression:
+ case TemplateArgument::Type:
+ // We have a template template parameter but the template
+ // argument does not refer to a template.
+ Diag(Arg.getLocation(), diag::err_template_arg_must_be_template);
+ return true;
+
+ case TemplateArgument::Declaration:
+ llvm_unreachable(
+ "Declaration argument with template template parameter");
+ break;
+ case TemplateArgument::Integral:
+ llvm_unreachable(
+ "Integral argument with template template parameter");
+ break;
+
+ case TemplateArgument::Pack:
+ llvm_unreachable("Caller must expand template argument packs");
+ break;
+ }
+
+ return false;
+}
+
+/// \brief Check that the given template argument list is well-formed
+/// for specializing the given template.
+bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
+ SourceLocation TemplateLoc,
+ const TemplateArgumentListInfo &TemplateArgs,
+ bool PartialTemplateArgs,
+ TemplateArgumentListBuilder &Converted) {
+ TemplateParameterList *Params = Template->getTemplateParameters();
+ unsigned NumParams = Params->size();
+ unsigned NumArgs = TemplateArgs.size();
+ bool Invalid = false;
+
+ SourceLocation RAngleLoc = TemplateArgs.getRAngleLoc();
+
+ bool HasParameterPack =
+ NumParams > 0 && Params->getParam(NumParams - 1)->isTemplateParameterPack();
+
+ if ((NumArgs > NumParams && !HasParameterPack) ||
+ (NumArgs < Params->getMinRequiredArguments() &&
+ !PartialTemplateArgs)) {
+ // FIXME: point at either the first arg beyond what we can handle,
+ // or the '>', depending on whether we have too many or too few
+ // arguments.
+ SourceRange Range;
+ if (NumArgs > NumParams)
+ Range = SourceRange(TemplateArgs[NumParams].getLocation(), RAngleLoc);
+ Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
+ << (NumArgs > NumParams)
+ << (isa<ClassTemplateDecl>(Template)? 0 :
+ isa<FunctionTemplateDecl>(Template)? 1 :
+ isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
+ << Template << Range;
+ Diag(Template->getLocation(), diag::note_template_decl_here)
+ << Params->getSourceRange();
+ Invalid = true;
+ }
+
+ // C++ [temp.arg]p1:
+ // [...] The type and form of each template-argument specified in
+ // a template-id shall match the type and form specified for the
+ // corresponding parameter declared by the template in its
+ // template-parameter-list.
+ unsigned ArgIdx = 0;
+ for (TemplateParameterList::iterator Param = Params->begin(),
+ ParamEnd = Params->end();
+ Param != ParamEnd; ++Param, ++ArgIdx) {
+ if (ArgIdx > NumArgs && PartialTemplateArgs)
+ break;
+
+ // If we have a template parameter pack, check every remaining template
+ // argument against that template parameter pack.
+ if ((*Param)->isTemplateParameterPack()) {
+ Converted.BeginPack();
+ for (; ArgIdx < NumArgs; ++ArgIdx) {
+ if (CheckTemplateArgument(*Param, TemplateArgs[ArgIdx], Template,
+ TemplateLoc, RAngleLoc, Converted)) {
+ Invalid = true;
+ break;
+ }
+ }
+ Converted.EndPack();
+ continue;
+ }
+
+ if (ArgIdx < NumArgs) {
+ // Check the template argument we were given.
+ if (CheckTemplateArgument(*Param, TemplateArgs[ArgIdx], Template,
+ TemplateLoc, RAngleLoc, Converted))
+ return true;
+
+ continue;
+ }
+
+ // We have a default template argument that we will use.
+ TemplateArgumentLoc Arg;
+
+ // Retrieve the default template argument from the template
+ // parameter. For each kind of template parameter, we substitute the
+ // template arguments provided thus far and any "outer" template arguments
+ // (when the template parameter was part of a nested template) into
+ // the default argument.
+ if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
+ if (!TTP->hasDefaultArgument()) {
+ assert((Invalid || PartialTemplateArgs) && "Missing default argument");
+ break;
+ }
+
+ TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
+ Template,
+ TemplateLoc,
+ RAngleLoc,
+ TTP,
+ Converted);
+ if (!ArgType)
+ return true;
+
+ Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()),
+ ArgType);
+ } else if (NonTypeTemplateParmDecl *NTTP
+ = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
+ if (!NTTP->hasDefaultArgument()) {
+ assert((Invalid || PartialTemplateArgs) && "Missing default argument");
+ break;
+ }
+
+ Sema::OwningExprResult E = SubstDefaultTemplateArgument(*this, Template,
+ TemplateLoc,
+ RAngleLoc,
+ NTTP,
+ Converted);
+ if (E.isInvalid())
+ return true;
+
+ Expr *Ex = E.takeAs<Expr>();
+ Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex);
+ } else {
+ TemplateTemplateParmDecl *TempParm
+ = cast<TemplateTemplateParmDecl>(*Param);
+
+ if (!TempParm->hasDefaultArgument()) {
+ assert((Invalid || PartialTemplateArgs) && "Missing default argument");
+ break;
+ }
+
+ TemplateName Name = SubstDefaultTemplateArgument(*this, Template,
+ TemplateLoc,
+ RAngleLoc,
+ TempParm,
+ Converted);
+ if (Name.isNull())
+ return true;
+
+ Arg = TemplateArgumentLoc(TemplateArgument(Name),
+ TempParm->getDefaultArgument().getTemplateQualifierRange(),
+ TempParm->getDefaultArgument().getTemplateNameLoc());
+ }
+
+ // Introduce an instantiation record that describes where we are using
+ // the default template argument.
+ InstantiatingTemplate Instantiating(*this, RAngleLoc, Template, *Param,
+ Converted.getFlatArguments(),
+ Converted.flatSize(),
+ SourceRange(TemplateLoc, RAngleLoc));
+
+ // Check the default template argument.
+ if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc,
+ RAngleLoc, Converted))
+ return true;
+ }
+
+ return Invalid;
+}
+
+/// \brief Check a template argument against its corresponding
+/// template type parameter.
+///
+/// This routine implements the semantics of C++ [temp.arg.type]. It
+/// returns true if an error occurred, and false otherwise.
+bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
+ TypeSourceInfo *ArgInfo) {
+ assert(ArgInfo && "invalid TypeSourceInfo");
+ QualType Arg = ArgInfo->getType();
+
+ // C++ [temp.arg.type]p2:
+ // A local type, a type with no linkage, an unnamed type or a type
+ // compounded from any of these types shall not be used as a
+ // template-argument for a template type-parameter.
+ //
+ // FIXME: Perform the recursive and no-linkage type checks.
+ const TagType *Tag = 0;
+ if (const EnumType *EnumT = Arg->getAs<EnumType>())
+ Tag = EnumT;
+ else if (const RecordType *RecordT = Arg->getAs<RecordType>())
+ Tag = RecordT;
+ if (Tag && Tag->getDecl()->getDeclContext()->isFunctionOrMethod()) {
+ SourceRange SR = ArgInfo->getTypeLoc().getFullSourceRange();
+ return Diag(SR.getBegin(), diag::err_template_arg_local_type)
+ << QualType(Tag, 0) << SR;
+ } else if (Tag && !Tag->getDecl()->getDeclName() &&
+ !Tag->getDecl()->getTypedefForAnonDecl()) {
+ SourceRange SR = ArgInfo->getTypeLoc().getFullSourceRange();
+ Diag(SR.getBegin(), diag::err_template_arg_unnamed_type) << SR;
+ Diag(Tag->getDecl()->getLocation(), diag::note_template_unnamed_type_here);
+ return true;
+ } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) {
+ SourceRange SR = ArgInfo->getTypeLoc().getFullSourceRange();
+ return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR;
+ }
+
+ return false;
+}
+
+/// \brief Checks whether the given template argument is the address
+/// of an object or function according to C++ [temp.arg.nontype]p1.
+bool Sema::CheckTemplateArgumentAddressOfObjectOrFunction(Expr *Arg,
+ NamedDecl *&Entity) {
+ bool Invalid = false;
+
+ // See through any implicit casts we added to fix the type.
+ while (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg))
+ Arg = Cast->getSubExpr();
+
+ // C++0x allows nullptr, and there's no further checking to be done for that.
+ if (Arg->getType()->isNullPtrType())
+ return false;
+
+ // C++ [temp.arg.nontype]p1:
+ //
+ // A template-argument for a non-type, non-template
+ // template-parameter shall be one of: [...]
+ //
+ // -- the address of an object or function with external
+ // linkage, including function templates and function
+ // template-ids but excluding non-static class members,
+ // expressed as & id-expression where the & is optional if
+ // the name refers to a function or array, or if the
+ // corresponding template-parameter is a reference; or
+ DeclRefExpr *DRE = 0;
+
+ // Ignore (and complain about) any excess parentheses.
+ while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
+ if (!Invalid) {
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_extra_parens)
+ << Arg->getSourceRange();
+ Invalid = true;
+ }
+
+ Arg = Parens->getSubExpr();
+ }
+
+ if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
+ if (UnOp->getOpcode() == UnaryOperator::AddrOf)
+ DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr());
+ } else
+ DRE = dyn_cast<DeclRefExpr>(Arg);
+
+ if (!DRE)
+ return Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_decl_ref)
+ << Arg->getSourceRange();
+
+ // Stop checking the precise nature of the argument if it is value dependent,
+ // it should be checked when instantiated.
+ if (Arg->isValueDependent())
+ return false;
+
+ if (!isa<ValueDecl>(DRE->getDecl()))
+ return Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_object_or_func_form)
+ << Arg->getSourceRange();
+
+ // Cannot refer to non-static data members
+ if (FieldDecl *Field = dyn_cast<FieldDecl>(DRE->getDecl()))
+ return Diag(Arg->getSourceRange().getBegin(), diag::err_template_arg_field)
+ << Field << Arg->getSourceRange();
+
+ // Cannot refer to non-static member functions
+ if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(DRE->getDecl()))
+ if (!Method->isStatic())
+ return Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_method)
+ << Method << Arg->getSourceRange();
+
+ // Functions must have external linkage.
+ if (FunctionDecl *Func = dyn_cast<FunctionDecl>(DRE->getDecl())) {
+ if (!isExternalLinkage(Func->getLinkage())) {
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_function_not_extern)
+ << Func << Arg->getSourceRange();
+ Diag(Func->getLocation(), diag::note_template_arg_internal_object)
+ << true;
+ return true;
+ }
+
+ // Okay: we've named a function with external linkage.
+ Entity = Func;
+ return Invalid;
+ }
+
+ if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
+ if (!isExternalLinkage(Var->getLinkage())) {
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_object_not_extern)
+ << Var << Arg->getSourceRange();
+ Diag(Var->getLocation(), diag::note_template_arg_internal_object)
+ << true;
+ return true;
+ }
+
+ // Okay: we've named an object with external linkage
+ Entity = Var;
+ return Invalid;
+ }
+
+ // We found something else, but we don't know specifically what it is.
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_object_or_func)
+ << Arg->getSourceRange();
+ Diag(DRE->getDecl()->getLocation(),
+ diag::note_template_arg_refers_here);
+ return true;
+}
+
+/// \brief Checks whether the given template argument is a pointer to
+/// member constant according to C++ [temp.arg.nontype]p1.
+bool Sema::CheckTemplateArgumentPointerToMember(Expr *Arg,
+ TemplateArgument &Converted) {
+ bool Invalid = false;
+
+ // See through any implicit casts we added to fix the type.
+ while (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg))
+ Arg = Cast->getSubExpr();
+
+ // C++0x allows nullptr, and there's no further checking to be done for that.
+ if (Arg->getType()->isNullPtrType())
+ return false;
+
+ // C++ [temp.arg.nontype]p1:
+ //
+ // A template-argument for a non-type, non-template
+ // template-parameter shall be one of: [...]
+ //
+ // -- a pointer to member expressed as described in 5.3.1.
+ DeclRefExpr *DRE = 0;
+
+ // Ignore (and complain about) any excess parentheses.
+ while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
+ if (!Invalid) {
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_extra_parens)
+ << Arg->getSourceRange();
+ Invalid = true;
+ }
+
+ Arg = Parens->getSubExpr();
+ }
+
+ // A pointer-to-member constant written &Class::member.
+ if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
+ if (UnOp->getOpcode() == UnaryOperator::AddrOf) {
+ DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr());
+ if (DRE && !DRE->getQualifier())
+ DRE = 0;
+ }
+ }
+ // A constant of pointer-to-member type.
+ else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) {
+ if (ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) {
+ if (VD->getType()->isMemberPointerType()) {
+ if (isa<NonTypeTemplateParmDecl>(VD) ||
+ (isa<VarDecl>(VD) &&
+ Context.getCanonicalType(VD->getType()).isConstQualified())) {
+ if (Arg->isTypeDependent() || Arg->isValueDependent())
+ Converted = TemplateArgument(Arg->Retain());
+ else
+ Converted = TemplateArgument(VD->getCanonicalDecl());
+ return Invalid;
+ }
+ }
+ }
+
+ DRE = 0;
+ }
+
+ if (!DRE)
+ return Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_pointer_to_member_form)
+ << Arg->getSourceRange();
+
+ if (isa<FieldDecl>(DRE->getDecl()) || isa<CXXMethodDecl>(DRE->getDecl())) {
+ assert((isa<FieldDecl>(DRE->getDecl()) ||
+ !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&
+ "Only non-static member pointers can make it here");
+
+ // Okay: this is the address of a non-static member, and therefore
+ // a member pointer constant.
+ if (Arg->isTypeDependent() || Arg->isValueDependent())
+ Converted = TemplateArgument(Arg->Retain());
+ else
+ Converted = TemplateArgument(DRE->getDecl()->getCanonicalDecl());
+ return Invalid;
+ }
+
+ // We found something else, but we don't know specifically what it is.
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_pointer_to_member_form)
+ << Arg->getSourceRange();
+ Diag(DRE->getDecl()->getLocation(),
+ diag::note_template_arg_refers_here);
+ return true;
+}
+
+/// \brief Check a template argument against its corresponding
+/// non-type template parameter.
+///
+/// This routine implements the semantics of C++ [temp.arg.nontype].
+/// It returns true if an error occurred, and false otherwise. \p
+/// InstantiatedParamType is the type of the non-type template
+/// parameter after it has been instantiated.
+///
+/// If no error was detected, Converted receives the converted template argument.
+bool Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
+ QualType InstantiatedParamType, Expr *&Arg,
+ TemplateArgument &Converted) {
+ SourceLocation StartLoc = Arg->getSourceRange().getBegin();
+
+ // If either the parameter has a dependent type or the argument is
+ // type-dependent, there's nothing we can check now.
+ // FIXME: Add template argument to Converted!
+ if (InstantiatedParamType->isDependentType() || Arg->isTypeDependent()) {
+ // FIXME: Produce a cloned, canonical expression?
+ Converted = TemplateArgument(Arg);
+ return false;
+ }
+
+ // C++ [temp.arg.nontype]p5:
+ // The following conversions are performed on each expression used
+ // as a non-type template-argument. If a non-type
+ // template-argument cannot be converted to the type of the
+ // corresponding template-parameter then the program is
+ // ill-formed.
+ //
+ // -- for a non-type template-parameter of integral or
+ // enumeration type, integral promotions (4.5) and integral
+ // conversions (4.7) are applied.
+ QualType ParamType = InstantiatedParamType;
+ QualType ArgType = Arg->getType();
+ if (ParamType->isIntegralType() || ParamType->isEnumeralType()) {
+ // C++ [temp.arg.nontype]p1:
+ // A template-argument for a non-type, non-template
+ // template-parameter shall be one of:
+ //
+ // -- an integral constant-expression of integral or enumeration
+ // type; or
+ // -- the name of a non-type template-parameter; or
+ SourceLocation NonConstantLoc;
+ llvm::APSInt Value;
+ if (!ArgType->isIntegralType() && !ArgType->isEnumeralType()) {
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_integral_or_enumeral)
+ << ArgType << Arg->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ } else if (!Arg->isValueDependent() &&
+ !Arg->isIntegerConstantExpr(Value, Context, &NonConstantLoc)) {
+ Diag(NonConstantLoc, diag::err_template_arg_not_ice)
+ << ArgType << Arg->getSourceRange();
+ return true;
+ }
+
+ // FIXME: We need some way to more easily get the unqualified form
+ // of the types without going all the way to the
+ // canonical type.
+ if (Context.getCanonicalType(ParamType).getCVRQualifiers())
+ ParamType = Context.getCanonicalType(ParamType).getUnqualifiedType();
+ if (Context.getCanonicalType(ArgType).getCVRQualifiers())
+ ArgType = Context.getCanonicalType(ArgType).getUnqualifiedType();
+
+ // Try to convert the argument to the parameter's type.
+ if (Context.hasSameType(ParamType, ArgType)) {
+ // Okay: no conversion necessary
+ } else if (IsIntegralPromotion(Arg, ArgType, ParamType) ||
+ !ParamType->isEnumeralType()) {
+ // This is an integral promotion or conversion.
+ ImpCastExprToType(Arg, ParamType, CastExpr::CK_IntegralCast);
+ } else {
+ // We can't perform this conversion.
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_convertible)
+ << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ QualType IntegerType = Context.getCanonicalType(ParamType);
+ if (const EnumType *Enum = IntegerType->getAs<EnumType>())
+ IntegerType = Context.getCanonicalType(Enum->getDecl()->getIntegerType());
+
+ if (!Arg->isValueDependent()) {
+ // Check that an unsigned parameter does not receive a negative
+ // value.
+ if (IntegerType->isUnsignedIntegerType()
+ && (Value.isSigned() && Value.isNegative())) {
+ Diag(Arg->getSourceRange().getBegin(), diag::err_template_arg_negative)
+ << Value.toString(10) << Param->getType()
+ << Arg->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ // Check that we don't overflow the template parameter type.
+ unsigned AllowedBits = Context.getTypeSize(IntegerType);
+ unsigned RequiredBits;
+ if (IntegerType->isUnsignedIntegerType())
+ RequiredBits = Value.getActiveBits();
+ else if (Value.isUnsigned())
+ RequiredBits = Value.getActiveBits() + 1;
+ else
+ RequiredBits = Value.getMinSignedBits();
+ if (RequiredBits > AllowedBits) {
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_too_large)
+ << Value.toString(10) << Param->getType()
+ << Arg->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ if (Value.getBitWidth() != AllowedBits)
+ Value.extOrTrunc(AllowedBits);
+ Value.setIsSigned(IntegerType->isSignedIntegerType());
+ }
+
+ // Add the value of this argument to the list of converted
+ // arguments. We use the bitwidth and signedness of the template
+ // parameter.
+ if (Arg->isValueDependent()) {
+ // The argument is value-dependent. Create a new
+ // TemplateArgument with the converted expression.
+ Converted = TemplateArgument(Arg);
+ return false;
+ }
+
+ Converted = TemplateArgument(Value,
+ ParamType->isEnumeralType() ? ParamType
+ : IntegerType);
+ return false;
+ }
+
+ // Handle pointer-to-function, reference-to-function, and
+ // pointer-to-member-function all in (roughly) the same way.
+ if (// -- For a non-type template-parameter of type pointer to
+ // function, only the function-to-pointer conversion (4.3) is
+ // applied. If the template-argument represents a set of
+ // overloaded functions (or a pointer to such), the matching
+ // function is selected from the set (13.4).
+ // In C++0x, any std::nullptr_t value can be converted.
+ (ParamType->isPointerType() &&
+ ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType()) ||
+ // -- For a non-type template-parameter of type reference to
+ // function, no conversions apply. If the template-argument
+ // represents a set of overloaded functions, the matching
+ // function is selected from the set (13.4).
+ (ParamType->isReferenceType() &&
+ ParamType->getAs<ReferenceType>()->getPointeeType()->isFunctionType()) ||
+ // -- For a non-type template-parameter of type pointer to
+ // member function, no conversions apply. If the
+ // template-argument represents a set of overloaded member
+ // functions, the matching member function is selected from
+ // the set (13.4).
+ // Again, C++0x allows a std::nullptr_t value.
+ (ParamType->isMemberPointerType() &&
+ ParamType->getAs<MemberPointerType>()->getPointeeType()
+ ->isFunctionType())) {
+ if (Context.hasSameUnqualifiedType(ArgType,
+ ParamType.getNonReferenceType())) {
+ // We don't have to do anything: the types already match.
+ } else if (ArgType->isNullPtrType() && (ParamType->isPointerType() ||
+ ParamType->isMemberPointerType())) {
+ ArgType = ParamType;
+ if (ParamType->isMemberPointerType())
+ ImpCastExprToType(Arg, ParamType, CastExpr::CK_NullToMemberPointer);
+ else
+ ImpCastExprToType(Arg, ParamType, CastExpr::CK_BitCast);
+ } else if (ArgType->isFunctionType() && ParamType->isPointerType()) {
+ ArgType = Context.getPointerType(ArgType);
+ ImpCastExprToType(Arg, ArgType, CastExpr::CK_FunctionToPointerDecay);
+ } else if (FunctionDecl *Fn
+ = ResolveAddressOfOverloadedFunction(Arg, ParamType, true)) {
+ if (DiagnoseUseOfDecl(Fn, Arg->getSourceRange().getBegin()))
+ return true;
+
+ Arg = FixOverloadedFunctionReference(Arg, Fn);
+ ArgType = Arg->getType();
+ if (ArgType->isFunctionType() && ParamType->isPointerType()) {
+ ArgType = Context.getPointerType(Arg->getType());
+ ImpCastExprToType(Arg, ArgType, CastExpr::CK_FunctionToPointerDecay);
+ }
+ }
+
+ if (!Context.hasSameUnqualifiedType(ArgType,
+ ParamType.getNonReferenceType())) {
+ // We can't perform this conversion.
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_convertible)
+ << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ if (ParamType->isMemberPointerType())
+ return CheckTemplateArgumentPointerToMember(Arg, Converted);
+
+ NamedDecl *Entity = 0;
+ if (CheckTemplateArgumentAddressOfObjectOrFunction(Arg, Entity))
+ return true;
+
+ if (Arg->isValueDependent()) {
+ Converted = TemplateArgument(Arg);
+ } else {
+ if (Entity)
+ Entity = cast<NamedDecl>(Entity->getCanonicalDecl());
+ Converted = TemplateArgument(Entity);
+ }
+ return false;
+ }
+
+ if (ParamType->isPointerType()) {
+ // -- for a non-type template-parameter of type pointer to
+ // object, qualification conversions (4.4) and the
+ // array-to-pointer conversion (4.2) are applied.
+ // C++0x also allows a value of std::nullptr_t.
+ assert(ParamType->getAs<PointerType>()->getPointeeType()->isObjectType() &&
+ "Only object pointers allowed here");
+
+ if (ArgType->isNullPtrType()) {
+ ArgType = ParamType;
+ ImpCastExprToType(Arg, ParamType, CastExpr::CK_BitCast);
+ } else if (ArgType->isArrayType()) {
+ ArgType = Context.getArrayDecayedType(ArgType);
+ ImpCastExprToType(Arg, ArgType, CastExpr::CK_ArrayToPointerDecay);
+ }
+
+ if (IsQualificationConversion(ArgType, ParamType)) {
+ ArgType = ParamType;
+ ImpCastExprToType(Arg, ParamType, CastExpr::CK_NoOp);
+ }
+
+ if (!Context.hasSameUnqualifiedType(ArgType, ParamType)) {
+ // We can't perform this conversion.
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_convertible)
+ << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ NamedDecl *Entity = 0;
+ if (CheckTemplateArgumentAddressOfObjectOrFunction(Arg, Entity))
+ return true;
+
+ if (Arg->isValueDependent()) {
+ Converted = TemplateArgument(Arg);
+ } else {
+ if (Entity)
+ Entity = cast<NamedDecl>(Entity->getCanonicalDecl());
+ Converted = TemplateArgument(Entity);
+ }
+ return false;
+ }
+
+ if (const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>()) {
+ // -- For a non-type template-parameter of type reference to
+ // object, no conversions apply. The type referred to by the
+ // reference may be more cv-qualified than the (otherwise
+ // identical) type of the template-argument. The
+ // template-parameter is bound directly to the
+ // template-argument, which must be an lvalue.
+ assert(ParamRefType->getPointeeType()->isObjectType() &&
+ "Only object references allowed here");
+
+ QualType ReferredType = ParamRefType->getPointeeType();
+ if (!Context.hasSameUnqualifiedType(ReferredType, ArgType)) {
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_no_ref_bind)
+ << InstantiatedParamType << Arg->getType()
+ << Arg->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ unsigned ParamQuals
+ = Context.getCanonicalType(ReferredType).getCVRQualifiers();
+ unsigned ArgQuals = Context.getCanonicalType(ArgType).getCVRQualifiers();
+
+ if ((ParamQuals | ArgQuals) != ParamQuals) {
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_ref_bind_ignores_quals)
+ << InstantiatedParamType << Arg->getType()
+ << Arg->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ NamedDecl *Entity = 0;
+ if (CheckTemplateArgumentAddressOfObjectOrFunction(Arg, Entity))
+ return true;
+
+ if (Arg->isValueDependent()) {
+ Converted = TemplateArgument(Arg);
+ } else {
+ Entity = cast<NamedDecl>(Entity->getCanonicalDecl());
+ Converted = TemplateArgument(Entity);
+ }
+ return false;
+ }
+
+ // -- For a non-type template-parameter of type pointer to data
+ // member, qualification conversions (4.4) are applied.
+ // C++0x allows std::nullptr_t values.
+ assert(ParamType->isMemberPointerType() && "Only pointers to members remain");
+
+ if (Context.hasSameUnqualifiedType(ParamType, ArgType)) {
+ // Types match exactly: nothing more to do here.
+ } else if (ArgType->isNullPtrType()) {
+ ImpCastExprToType(Arg, ParamType, CastExpr::CK_NullToMemberPointer);
+ } else if (IsQualificationConversion(ArgType, ParamType)) {
+ ImpCastExprToType(Arg, ParamType, CastExpr::CK_NoOp);
+ } else {
+ // We can't perform this conversion.
+ Diag(Arg->getSourceRange().getBegin(),
+ diag::err_template_arg_not_convertible)
+ << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ return CheckTemplateArgumentPointerToMember(Arg, Converted);
+}
+
+/// \brief Check a template argument against its corresponding
+/// template template parameter.
+///
+/// This routine implements the semantics of C++ [temp.arg.template].
+/// It returns true if an error occurred, and false otherwise.
+bool Sema::CheckTemplateArgument(TemplateTemplateParmDecl *Param,
+ const TemplateArgumentLoc &Arg) {
+ TemplateName Name = Arg.getArgument().getAsTemplate();
+ TemplateDecl *Template = Name.getAsTemplateDecl();
+ if (!Template) {
+ // Any dependent template name is fine.
+ assert(Name.isDependent() && "Non-dependent template isn't a declaration?");
+ return false;
+ }
+
+ // C++ [temp.arg.template]p1:
+ // A template-argument for a template template-parameter shall be
+ // the name of a class template, expressed as id-expression. Only
+ // primary class templates are considered when matching the
+ // template template argument with the corresponding parameter;
+ // partial specializations are not considered even if their
+ // parameter lists match that of the template template parameter.
+ //
+ // Note that we also allow template template parameters here, which
+ // will happen when we are dealing with, e.g., class template
+ // partial specializations.
+ if (!isa<ClassTemplateDecl>(Template) &&
+ !isa<TemplateTemplateParmDecl>(Template)) {
+ assert(isa<FunctionTemplateDecl>(Template) &&
+ "Only function templates are possible here");
+ Diag(Arg.getLocation(), diag::err_template_arg_not_class_template);
+ Diag(Template->getLocation(), diag::note_template_arg_refers_here_func)
+ << Template;
+ }
+
+ return !TemplateParameterListsAreEqual(Template->getTemplateParameters(),
+ Param->getTemplateParameters(),
+ true,
+ TPL_TemplateTemplateArgumentMatch,
+ Arg.getLocation());
+}
+
+/// \brief Determine whether the given template parameter lists are
+/// equivalent.
+///
+/// \param New The new template parameter list, typically written in the
+/// source code as part of a new template declaration.
+///
+/// \param Old The old template parameter list, typically found via
+/// name lookup of the template declared with this template parameter
+/// list.
+///
+/// \param Complain If true, this routine will produce a diagnostic if
+/// the template parameter lists are not equivalent.
+///
+/// \param Kind describes how we are to match the template parameter lists.
+///
+/// \param TemplateArgLoc If this source location is valid, then we
+/// are actually checking the template parameter list of a template
+/// argument (New) against the template parameter list of its
+/// corresponding template template parameter (Old). We produce
+/// slightly different diagnostics in this scenario.
+///
+/// \returns True if the template parameter lists are equal, false
+/// otherwise.
+bool
+Sema::TemplateParameterListsAreEqual(TemplateParameterList *New,
+ TemplateParameterList *Old,
+ bool Complain,
+ TemplateParameterListEqualKind Kind,
+ SourceLocation TemplateArgLoc) {
+ if (Old->size() != New->size()) {
+ if (Complain) {
+ unsigned NextDiag = diag::err_template_param_list_different_arity;
+ if (TemplateArgLoc.isValid()) {
+ Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
+ NextDiag = diag::note_template_param_list_different_arity;
+ }
+ Diag(New->getTemplateLoc(), NextDiag)
+ << (New->size() > Old->size())
+ << (Kind != TPL_TemplateMatch)
+ << SourceRange(New->getTemplateLoc(), New->getRAngleLoc());
+ Diag(Old->getTemplateLoc(), diag::note_template_prev_declaration)
+ << (Kind != TPL_TemplateMatch)
+ << SourceRange(Old->getTemplateLoc(), Old->getRAngleLoc());
+ }
+
+ return false;
+ }
+
+ for (TemplateParameterList::iterator OldParm = Old->begin(),
+ OldParmEnd = Old->end(), NewParm = New->begin();
+ OldParm != OldParmEnd; ++OldParm, ++NewParm) {
+ if ((*OldParm)->getKind() != (*NewParm)->getKind()) {
+ if (Complain) {
+ unsigned NextDiag = diag::err_template_param_different_kind;
+ if (TemplateArgLoc.isValid()) {
+ Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
+ NextDiag = diag::note_template_param_different_kind;
+ }
+ Diag((*NewParm)->getLocation(), NextDiag)
+ << (Kind != TPL_TemplateMatch);
+ Diag((*OldParm)->getLocation(), diag::note_template_prev_declaration)
+ << (Kind != TPL_TemplateMatch);
+ }
+ return false;
+ }
+
+ if (isa<TemplateTypeParmDecl>(*OldParm)) {
+ // Okay; all template type parameters are equivalent (since we
+ // know we're at the same index).
+ } else if (NonTypeTemplateParmDecl *OldNTTP
+ = dyn_cast<NonTypeTemplateParmDecl>(*OldParm)) {
+ // The types of non-type template parameters must agree.
+ NonTypeTemplateParmDecl *NewNTTP
+ = cast<NonTypeTemplateParmDecl>(*NewParm);
+
+ // If we are matching a template template argument to a template
+ // template parameter and one of the non-type template parameter types
+ // is dependent, then we must wait until template instantiation time
+ // to actually compare the arguments.
+ if (Kind == TPL_TemplateTemplateArgumentMatch &&
+ (OldNTTP->getType()->isDependentType() ||
+ NewNTTP->getType()->isDependentType()))
+ continue;
+
+ if (Context.getCanonicalType(OldNTTP->getType()) !=
+ Context.getCanonicalType(NewNTTP->getType())) {
+ if (Complain) {
+ unsigned NextDiag = diag::err_template_nontype_parm_different_type;
+ if (TemplateArgLoc.isValid()) {
+ Diag(TemplateArgLoc,
+ diag::err_template_arg_template_params_mismatch);
+ NextDiag = diag::note_template_nontype_parm_different_type;
+ }
+ Diag(NewNTTP->getLocation(), NextDiag)
+ << NewNTTP->getType()
+ << (Kind != TPL_TemplateMatch);
+ Diag(OldNTTP->getLocation(),
+ diag::note_template_nontype_parm_prev_declaration)
+ << OldNTTP->getType();
+ }
+ return false;
+ }
+ } else {
+ // The template parameter lists of template template
+ // parameters must agree.
+ assert(isa<TemplateTemplateParmDecl>(*OldParm) &&
+ "Only template template parameters handled here");
+ TemplateTemplateParmDecl *OldTTP
+ = cast<TemplateTemplateParmDecl>(*OldParm);
+ TemplateTemplateParmDecl *NewTTP
+ = cast<TemplateTemplateParmDecl>(*NewParm);
+ if (!TemplateParameterListsAreEqual(NewTTP->getTemplateParameters(),
+ OldTTP->getTemplateParameters(),
+ Complain,
+ (Kind == TPL_TemplateMatch? TPL_TemplateTemplateParmMatch : Kind),
+ TemplateArgLoc))
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/// \brief Check whether a template can be declared within this scope.
+///
+/// If the template declaration is valid in this scope, returns
+/// false. Otherwise, issues a diagnostic and returns true.
+bool
+Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) {
+ // Find the nearest enclosing declaration scope.
+ while ((S->getFlags() & Scope::DeclScope) == 0 ||
+ (S->getFlags() & Scope::TemplateParamScope) != 0)
+ S = S->getParent();
+
+ // C++ [temp]p2:
+ // A template-declaration can appear only as a namespace scope or
+ // class scope declaration.
+ DeclContext *Ctx = static_cast<DeclContext *>(S->getEntity());
+ if (Ctx && isa<LinkageSpecDecl>(Ctx) &&
+ cast<LinkageSpecDecl>(Ctx)->getLanguage() != LinkageSpecDecl::lang_cxx)
+ return Diag(TemplateParams->getTemplateLoc(), diag::err_template_linkage)
+ << TemplateParams->getSourceRange();
+
+ while (Ctx && isa<LinkageSpecDecl>(Ctx))
+ Ctx = Ctx->getParent();
+
+ if (Ctx && (Ctx->isFileContext() || Ctx->isRecord()))
+ return false;
+
+ return Diag(TemplateParams->getTemplateLoc(),
+ diag::err_template_outside_namespace_or_class_scope)
+ << TemplateParams->getSourceRange();
+}
+
+/// \brief Determine what kind of template specialization the given declaration
+/// is.
+static TemplateSpecializationKind getTemplateSpecializationKind(NamedDecl *D) {
+ if (!D)
+ return TSK_Undeclared;
+
+ if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D))
+ return Record->getTemplateSpecializationKind();
+ if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D))
+ return Function->getTemplateSpecializationKind();
+ if (VarDecl *Var = dyn_cast<VarDecl>(D))
+ return Var->getTemplateSpecializationKind();
+
+ return TSK_Undeclared;
+}
+
+/// \brief Check whether a specialization is well-formed in the current
+/// context.
+///
+/// This routine determines whether a template specialization can be declared
+/// in the current context (C++ [temp.expl.spec]p2).
+///
+/// \param S the semantic analysis object for which this check is being
+/// performed.
+///
+/// \param Specialized the entity being specialized or instantiated, which
+/// may be a kind of template (class template, function template, etc.) or
+/// a member of a class template (member function, static data member,
+/// member class).
+///
+/// \param PrevDecl the previous declaration of this entity, if any.
+///
+/// \param Loc the location of the explicit specialization or instantiation of
+/// this entity.
+///
+/// \param IsPartialSpecialization whether this is a partial specialization of
+/// a class template.
+///
+/// \returns true if there was an error that we cannot recover from, false
+/// otherwise.
+static bool CheckTemplateSpecializationScope(Sema &S,
+ NamedDecl *Specialized,
+ NamedDecl *PrevDecl,
+ SourceLocation Loc,
+ bool IsPartialSpecialization) {
+ // Keep these "kind" numbers in sync with the %select statements in the
+ // various diagnostics emitted by this routine.
+ int EntityKind = 0;
+ bool isTemplateSpecialization = false;
+ if (isa<ClassTemplateDecl>(Specialized)) {
+ EntityKind = IsPartialSpecialization? 1 : 0;
+ isTemplateSpecialization = true;
+ } else if (isa<FunctionTemplateDecl>(Specialized)) {
+ EntityKind = 2;
+ isTemplateSpecialization = true;
+ } else if (isa<CXXMethodDecl>(Specialized))
+ EntityKind = 3;
+ else if (isa<VarDecl>(Specialized))
+ EntityKind = 4;
+ else if (isa<RecordDecl>(Specialized))
+ EntityKind = 5;
+ else {
+ S.Diag(Loc, diag::err_template_spec_unknown_kind);
+ S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
+ return true;
+ }
+
+ // C++ [temp.expl.spec]p2:
+ // An explicit specialization shall be declared in the namespace
+ // of which the template is a member, or, for member templates, in
+ // the namespace of which the enclosing class or enclosing class
+ // template is a member. An explicit specialization of a member
+ // function, member class or static data member of a class
+ // template shall be declared in the namespace of which the class
+ // template is a member. Such a declaration may also be a
+ // definition. If the declaration is not a definition, the
+ // specialization may be defined later in the name- space in which
+ // the explicit specialization was declared, or in a namespace
+ // that encloses the one in which the explicit specialization was
+ // declared.
+ if (S.CurContext->getLookupContext()->isFunctionOrMethod()) {
+ S.Diag(Loc, diag::err_template_spec_decl_function_scope)
+ << Specialized;
+ return true;
+ }
+
+ if (S.CurContext->isRecord() && !IsPartialSpecialization) {
+ S.Diag(Loc, diag::err_template_spec_decl_class_scope)
+ << Specialized;
+ return true;
+ }
+
+ // C++ [temp.class.spec]p6:
+ // A class template partial specialization may be declared or redeclared
+ // in any namespace scope in which its definition may be defined (14.5.1
+ // and 14.5.2).
+ bool ComplainedAboutScope = false;
+ DeclContext *SpecializedContext
+ = Specialized->getDeclContext()->getEnclosingNamespaceContext();
+ DeclContext *DC = S.CurContext->getEnclosingNamespaceContext();
+ if ((!PrevDecl ||
+ getTemplateSpecializationKind(PrevDecl) == TSK_Undeclared ||
+ getTemplateSpecializationKind(PrevDecl) == TSK_ImplicitInstantiation)){
+ // There is no prior declaration of this entity, so this
+ // specialization must be in the same context as the template
+ // itself.
+ if (!DC->Equals(SpecializedContext)) {
+ if (isa<TranslationUnitDecl>(SpecializedContext))
+ S.Diag(Loc, diag::err_template_spec_decl_out_of_scope_global)
+ << EntityKind << Specialized;
+ else if (isa<NamespaceDecl>(SpecializedContext))
+ S.Diag(Loc, diag::err_template_spec_decl_out_of_scope)
+ << EntityKind << Specialized
+ << cast<NamedDecl>(SpecializedContext);
+
+ S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
+ ComplainedAboutScope = true;
+ }
+ }
+
+ // Make sure that this redeclaration (or definition) occurs in an enclosing
+ // namespace.
+ // Note that HandleDeclarator() performs this check for explicit
+ // specializations of function templates, static data members, and member
+ // functions, so we skip the check here for those kinds of entities.
+ // FIXME: HandleDeclarator's diagnostics aren't quite as good, though.
+ // Should we refactor that check, so that it occurs later?
+ if (!ComplainedAboutScope && !DC->Encloses(SpecializedContext) &&
+ !(isa<FunctionTemplateDecl>(Specialized) || isa<VarDecl>(Specialized) ||
+ isa<FunctionDecl>(Specialized))) {
+ if (isa<TranslationUnitDecl>(SpecializedContext))
+ S.Diag(Loc, diag::err_template_spec_redecl_global_scope)
+ << EntityKind << Specialized;
+ else if (isa<NamespaceDecl>(SpecializedContext))
+ S.Diag(Loc, diag::err_template_spec_redecl_out_of_scope)
+ << EntityKind << Specialized
+ << cast<NamedDecl>(SpecializedContext);
+
+ S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
+ }
+
+ // FIXME: check for specialization-after-instantiation errors and such.
+
+ return false;
+}
+
+/// \brief Check the non-type template arguments of a class template
+/// partial specialization according to C++ [temp.class.spec]p9.
+///
+/// \param TemplateParams the template parameters of the primary class
+/// template.
+///
+/// \param TemplateArg the template arguments of the class template
+/// partial specialization.
+///
+/// \param MirrorsPrimaryTemplate will be set true if the class
+/// template partial specialization arguments are identical to the
+/// implicit template arguments of the primary template. This is not
+/// necessarily an error (C++0x), and it is left to the caller to diagnose
+/// this condition when it is an error.
+///
+/// \returns true if there was an error, false otherwise.
+bool Sema::CheckClassTemplatePartialSpecializationArgs(
+ TemplateParameterList *TemplateParams,
+ const TemplateArgumentListBuilder &TemplateArgs,
+ bool &MirrorsPrimaryTemplate) {
+ // FIXME: the interface to this function will have to change to
+ // accommodate variadic templates.
+ MirrorsPrimaryTemplate = true;
+
+ const TemplateArgument *ArgList = TemplateArgs.getFlatArguments();
+
+ for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
+ // Determine whether the template argument list of the partial
+ // specialization is identical to the implicit argument list of
+ // the primary template. The caller may need to diagnostic this as
+ // an error per C++ [temp.class.spec]p9b3.
+ if (MirrorsPrimaryTemplate) {
+ if (TemplateTypeParmDecl *TTP
+ = dyn_cast<TemplateTypeParmDecl>(TemplateParams->getParam(I))) {
+ if (Context.getCanonicalType(Context.getTypeDeclType(TTP)) !=
+ Context.getCanonicalType(ArgList[I].getAsType()))
+ MirrorsPrimaryTemplate = false;
+ } else if (TemplateTemplateParmDecl *TTP
+ = dyn_cast<TemplateTemplateParmDecl>(
+ TemplateParams->getParam(I))) {
+ TemplateName Name = ArgList[I].getAsTemplate();
+ TemplateTemplateParmDecl *ArgDecl
+ = dyn_cast_or_null<TemplateTemplateParmDecl>(Name.getAsTemplateDecl());
+ if (!ArgDecl ||
+ ArgDecl->getIndex() != TTP->getIndex() ||
+ ArgDecl->getDepth() != TTP->getDepth())
+ MirrorsPrimaryTemplate = false;
+ }
+ }
+
+ NonTypeTemplateParmDecl *Param
+ = dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(I));
+ if (!Param) {
+ continue;
+ }
+
+ Expr *ArgExpr = ArgList[I].getAsExpr();
+ if (!ArgExpr) {
+ MirrorsPrimaryTemplate = false;
+ continue;
+ }
+
+ // C++ [temp.class.spec]p8:
+ // A non-type argument is non-specialized if it is the name of a
+ // non-type parameter. All other non-type arguments are
+ // specialized.
+ //
+ // Below, we check the two conditions that only apply to
+ // specialized non-type arguments, so skip any non-specialized
+ // arguments.
+ if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr))
+ if (NonTypeTemplateParmDecl *NTTP
+ = dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl())) {
+ if (MirrorsPrimaryTemplate &&
+ (Param->getIndex() != NTTP->getIndex() ||
+ Param->getDepth() != NTTP->getDepth()))
+ MirrorsPrimaryTemplate = false;
+
+ continue;
+ }
+
+ // C++ [temp.class.spec]p9:
+ // Within the argument list of a class template partial
+ // specialization, the following restrictions apply:
+ // -- A partially specialized non-type argument expression
+ // shall not involve a template parameter of the partial
+ // specialization except when the argument expression is a
+ // simple identifier.
+ if (ArgExpr->isTypeDependent() || ArgExpr->isValueDependent()) {
+ Diag(ArgExpr->getLocStart(),
+ diag::err_dependent_non_type_arg_in_partial_spec)
+ << ArgExpr->getSourceRange();
+ return true;
+ }
+
+ // -- The type of a template parameter corresponding to a
+ // specialized non-type argument shall not be dependent on a
+ // parameter of the specialization.
+ if (Param->getType()->isDependentType()) {
+ Diag(ArgExpr->getLocStart(),
+ diag::err_dependent_typed_non_type_arg_in_partial_spec)
+ << Param->getType()
+ << ArgExpr->getSourceRange();
+ Diag(Param->getLocation(), diag::note_template_param_here);
+ return true;
+ }
+
+ MirrorsPrimaryTemplate = false;
+ }
+
+ return false;
+}
+
+Sema::DeclResult
+Sema::ActOnClassTemplateSpecialization(Scope *S, unsigned TagSpec,
+ TagUseKind TUK,
+ SourceLocation KWLoc,
+ const CXXScopeSpec &SS,
+ TemplateTy TemplateD,
+ SourceLocation TemplateNameLoc,
+ SourceLocation LAngleLoc,
+ ASTTemplateArgsPtr TemplateArgsIn,
+ SourceLocation RAngleLoc,
+ AttributeList *Attr,
+ MultiTemplateParamsArg TemplateParameterLists) {
+ assert(TUK != TUK_Reference && "References are not specializations");
+
+ // Find the class template we're specializing
+ TemplateName Name = TemplateD.getAsVal<TemplateName>();
+ ClassTemplateDecl *ClassTemplate
+ = dyn_cast_or_null<ClassTemplateDecl>(Name.getAsTemplateDecl());
+
+ if (!ClassTemplate) {
+ Diag(TemplateNameLoc, diag::err_not_class_template_specialization)
+ << (Name.getAsTemplateDecl() &&
+ isa<TemplateTemplateParmDecl>(Name.getAsTemplateDecl()));
+ return true;
+ }
+
+ bool isExplicitSpecialization = false;
+ bool isPartialSpecialization = false;
+
+ // Check the validity of the template headers that introduce this
+ // template.
+ // FIXME: We probably shouldn't complain about these headers for
+ // friend declarations.
+ TemplateParameterList *TemplateParams
+ = MatchTemplateParametersToScopeSpecifier(TemplateNameLoc, SS,
+ (TemplateParameterList**)TemplateParameterLists.get(),
+ TemplateParameterLists.size(),
+ isExplicitSpecialization);
+ if (TemplateParams && TemplateParams->size() > 0) {
+ isPartialSpecialization = true;
+
+ // C++ [temp.class.spec]p10:
+ // The template parameter list of a specialization shall not
+ // contain default template argument values.
+ for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
+ Decl *Param = TemplateParams->getParam(I);
+ if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
+ if (TTP->hasDefaultArgument()) {
+ Diag(TTP->getDefaultArgumentLoc(),
+ diag::err_default_arg_in_partial_spec);
+ TTP->removeDefaultArgument();
+ }
+ } else if (NonTypeTemplateParmDecl *NTTP
+ = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
+ if (Expr *DefArg = NTTP->getDefaultArgument()) {
+ Diag(NTTP->getDefaultArgumentLoc(),
+ diag::err_default_arg_in_partial_spec)
+ << DefArg->getSourceRange();
+ NTTP->setDefaultArgument(0);
+ DefArg->Destroy(Context);
+ }
+ } else {
+ TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(Param);
+ if (TTP->hasDefaultArgument()) {
+ Diag(TTP->getDefaultArgument().getLocation(),
+ diag::err_default_arg_in_partial_spec)
+ << TTP->getDefaultArgument().getSourceRange();
+ TTP->setDefaultArgument(TemplateArgumentLoc());
+ }
+ }
+ }
+ } else if (TemplateParams) {
+ if (TUK == TUK_Friend)
+ Diag(KWLoc, diag::err_template_spec_friend)
+ << CodeModificationHint::CreateRemoval(
+ SourceRange(TemplateParams->getTemplateLoc(),
+ TemplateParams->getRAngleLoc()))
+ << SourceRange(LAngleLoc, RAngleLoc);
+ else
+ isExplicitSpecialization = true;
+ } else if (TUK != TUK_Friend) {
+ Diag(KWLoc, diag::err_template_spec_needs_header)
+ << CodeModificationHint::CreateInsertion(KWLoc, "template<> ");
+ isExplicitSpecialization = true;
+ }
+
+ // Check that the specialization uses the same tag kind as the
+ // original template.
+ TagDecl::TagKind Kind;
+ switch (TagSpec) {
+ default: assert(0 && "Unknown tag type!");
+ case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break;
+ case DeclSpec::TST_union: Kind = TagDecl::TK_union; break;
+ case DeclSpec::TST_class: Kind = TagDecl::TK_class; break;
+ }
+ if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
+ Kind, KWLoc,
+ *ClassTemplate->getIdentifier())) {
+ Diag(KWLoc, diag::err_use_with_wrong_tag)
+ << ClassTemplate
+ << CodeModificationHint::CreateReplacement(KWLoc,
+ ClassTemplate->getTemplatedDecl()->getKindName());
+ Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
+ diag::note_previous_use);
+ Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
+ }
+
+ // Translate the parser's template argument list in our AST format.
+ TemplateArgumentListInfo TemplateArgs;
+ TemplateArgs.setLAngleLoc(LAngleLoc);
+ TemplateArgs.setRAngleLoc(RAngleLoc);
+ translateTemplateArguments(TemplateArgsIn, TemplateArgs);
+
+ // Check that the template argument list is well-formed for this
+ // template.
+ TemplateArgumentListBuilder Converted(ClassTemplate->getTemplateParameters(),
+ TemplateArgs.size());
+ if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
+ TemplateArgs, false, Converted))
+ return true;
+
+ assert((Converted.structuredSize() ==
+ ClassTemplate->getTemplateParameters()->size()) &&
+ "Converted template argument list is too short!");
+
+ // Find the class template (partial) specialization declaration that
+ // corresponds to these arguments.
+ llvm::FoldingSetNodeID ID;
+ if (isPartialSpecialization) {
+ bool MirrorsPrimaryTemplate;
+ if (CheckClassTemplatePartialSpecializationArgs(
+ ClassTemplate->getTemplateParameters(),
+ Converted, MirrorsPrimaryTemplate))
+ return true;
+
+ if (MirrorsPrimaryTemplate) {
+ // C++ [temp.class.spec]p9b3:
+ //
+ // -- The argument list of the specialization shall not be identical
+ // to the implicit argument list of the primary template.
+ Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
+ << (TUK == TUK_Definition)
+ << CodeModificationHint::CreateRemoval(SourceRange(LAngleLoc,
+ RAngleLoc));
+ return CheckClassTemplate(S, TagSpec, TUK, KWLoc, SS,
+ ClassTemplate->getIdentifier(),
+ TemplateNameLoc,
+ Attr,
+ TemplateParams,
+ AS_none);
+ }
+
+ // FIXME: Diagnose friend partial specializations
+
+ if (!Name.isDependent() &&
+ !TemplateSpecializationType::anyDependentTemplateArguments(
+ TemplateArgs.getArgumentArray(),
+ TemplateArgs.size())) {
+ Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
+ << ClassTemplate->getDeclName();
+ isPartialSpecialization = false;
+ } else {
+ // FIXME: Template parameter list matters, too
+ ClassTemplatePartialSpecializationDecl::Profile(ID,
+ Converted.getFlatArguments(),
+ Converted.flatSize(),
+ Context);
+ }
+ }
+
+ if (!isPartialSpecialization)
+ ClassTemplateSpecializationDecl::Profile(ID,
+ Converted.getFlatArguments(),
+ Converted.flatSize(),
+ Context);
+ void *InsertPos = 0;
+ ClassTemplateSpecializationDecl *PrevDecl = 0;
+
+ if (isPartialSpecialization)
+ PrevDecl
+ = ClassTemplate->getPartialSpecializations().FindNodeOrInsertPos(ID,
+ InsertPos);
+ else
+ PrevDecl
+ = ClassTemplate->getSpecializations().FindNodeOrInsertPos(ID, InsertPos);
+
+ ClassTemplateSpecializationDecl *Specialization = 0;
+
+ // Check whether we can declare a class template specialization in
+ // the current scope.
+ if (TUK != TUK_Friend &&
+ CheckTemplateSpecializationScope(*this, ClassTemplate, PrevDecl,
+ TemplateNameLoc,
+ isPartialSpecialization))
+ return true;
+
+ // The canonical type
+ QualType CanonType;
+ if (PrevDecl &&
+ (PrevDecl->getSpecializationKind() == TSK_Undeclared ||
+ TUK == TUK_Friend)) {
+ // Since the only prior class template specialization with these
+ // arguments was referenced but not declared, or we're only
+ // referencing this specialization as a friend, reuse that
+ // declaration node as our own, updating its source location to
+ // reflect our new declaration.
+ Specialization = PrevDecl;
+ Specialization->setLocation(TemplateNameLoc);
+ PrevDecl = 0;
+ CanonType = Context.getTypeDeclType(Specialization);
+ } else if (isPartialSpecialization) {
+ // Build the canonical type that describes the converted template
+ // arguments of the class template partial specialization.
+ TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name);
+ CanonType = Context.getTemplateSpecializationType(CanonTemplate,
+ Converted.getFlatArguments(),
+ Converted.flatSize());
+
+ // Create a new class template partial specialization declaration node.
+ ClassTemplatePartialSpecializationDecl *PrevPartial
+ = cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl);
+ ClassTemplatePartialSpecializationDecl *Partial
+ = ClassTemplatePartialSpecializationDecl::Create(Context,
+ ClassTemplate->getDeclContext(),
+ TemplateNameLoc,
+ TemplateParams,
+ ClassTemplate,
+ Converted,
+ TemplateArgs,
+ PrevPartial);
+
+ if (PrevPartial) {
+ ClassTemplate->getPartialSpecializations().RemoveNode(PrevPartial);
+ ClassTemplate->getPartialSpecializations().GetOrInsertNode(Partial);
+ } else {
+ ClassTemplate->getPartialSpecializations().InsertNode(Partial, InsertPos);
+ }
+ Specialization = Partial;
+
+ // If we are providing an explicit specialization of a member class
+ // template specialization, make a note of that.
+ if (PrevPartial && PrevPartial->getInstantiatedFromMember())
+ PrevPartial->setMemberSpecialization();
+
+ // Check that all of the template parameters of the class template
+ // partial specialization are deducible from the template
+ // arguments. If not, this class template partial specialization
+ // will never be used.
+ llvm::SmallVector<bool, 8> DeducibleParams;
+ DeducibleParams.resize(TemplateParams->size());
+ MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
+ TemplateParams->getDepth(),
+ DeducibleParams);
+ unsigned NumNonDeducible = 0;
+ for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I)
+ if (!DeducibleParams[I])
+ ++NumNonDeducible;
+
+ if (NumNonDeducible) {
+ Diag(TemplateNameLoc, diag::warn_partial_specs_not_deducible)
+ << (NumNonDeducible > 1)
+ << SourceRange(TemplateNameLoc, RAngleLoc);
+ for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
+ if (!DeducibleParams[I]) {
+ NamedDecl *Param = cast<NamedDecl>(TemplateParams->getParam(I));
+ if (Param->getDeclName())
+ Diag(Param->getLocation(),
+ diag::note_partial_spec_unused_parameter)
+ << Param->getDeclName();
+ else
+ Diag(Param->getLocation(),
+ diag::note_partial_spec_unused_parameter)
+ << std::string("<anonymous>");
+ }
+ }
+ }
+ } else {
+ // Create a new class template specialization declaration node for
+ // this explicit specialization or friend declaration.
+ Specialization
+ = ClassTemplateSpecializationDecl::Create(Context,
+ ClassTemplate->getDeclContext(),
+ TemplateNameLoc,
+ ClassTemplate,
+ Converted,
+ PrevDecl);
+
+ if (PrevDecl) {
+ ClassTemplate->getSpecializations().RemoveNode(PrevDecl);
+ ClassTemplate->getSpecializations().GetOrInsertNode(Specialization);
+ } else {
+ ClassTemplate->getSpecializations().InsertNode(Specialization,
+ InsertPos);
+ }
+
+ CanonType = Context.getTypeDeclType(Specialization);
+ }
+
+ // C++ [temp.expl.spec]p6:
+ // If a template, a member template or the member of a class template is
+ // explicitly specialized then that specialization shall be declared
+ // before the first use of that specialization that would cause an implicit
+ // instantiation to take place, in every translation unit in which such a
+ // use occurs; no diagnostic is required.
+ if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
+ SourceRange Range(TemplateNameLoc, RAngleLoc);
+ Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
+ << Context.getTypeDeclType(Specialization) << Range;
+
+ Diag(PrevDecl->getPointOfInstantiation(),
+ diag::note_instantiation_required_here)
+ << (PrevDecl->getTemplateSpecializationKind()
+ != TSK_ImplicitInstantiation);
+ return true;
+ }
+
+ // If this is not a friend, note that this is an explicit specialization.
+ if (TUK != TUK_Friend)
+ Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
+
+ // Check that this isn't a redefinition of this specialization.
+ if (TUK == TUK_Definition) {
+ if (RecordDecl *Def = Specialization->getDefinition(Context)) {
+ SourceRange Range(TemplateNameLoc, RAngleLoc);
+ Diag(TemplateNameLoc, diag::err_redefinition)
+ << Context.getTypeDeclType(Specialization) << Range;
+ Diag(Def->getLocation(), diag::note_previous_definition);
+ Specialization->setInvalidDecl();
+ return true;
+ }
+ }
+
+ // 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.
+ QualType WrittenTy
+ = Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
+ if (TUK != TUK_Friend)
+ Specialization->setTypeAsWritten(WrittenTy);
+ TemplateArgsIn.release();
+
+ // C++ [temp.expl.spec]p9:
+ // A template explicit specialization is in the scope of the
+ // namespace in which the template was defined.
+ //
+ // We actually implement this paragraph where we set the semantic
+ // context (in the creation of the ClassTemplateSpecializationDecl),
+ // but we also maintain the lexical context where the actual
+ // definition occurs.
+ Specialization->setLexicalDeclContext(CurContext);
+
+ // We may be starting the definition of this specialization.
+ if (TUK == TUK_Definition)
+ Specialization->startDefinition();
+
+ if (TUK == TUK_Friend) {
+ FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
+ TemplateNameLoc,
+ WrittenTy.getTypePtr(),
+ /*FIXME:*/KWLoc);
+ Friend->setAccess(AS_public);
+ CurContext->addDecl(Friend);
+ } else {
+ // Add the specialization into its lexical context, so that it can
+ // be seen when iterating through the list of declarations in that
+ // context. However, specializations are not found by name lookup.
+ CurContext->addDecl(Specialization);
+ }
+ return DeclPtrTy::make(Specialization);
+}
+
+Sema::DeclPtrTy
+Sema::ActOnTemplateDeclarator(Scope *S,
+ MultiTemplateParamsArg TemplateParameterLists,
+ Declarator &D) {
+ return HandleDeclarator(S, D, move(TemplateParameterLists), false);
+}
+
+Sema::DeclPtrTy
+Sema::ActOnStartOfFunctionTemplateDef(Scope *FnBodyScope,
+ MultiTemplateParamsArg TemplateParameterLists,
+ Declarator &D) {
+ assert(getCurFunctionDecl() == 0 && "Function parsing confused");
+ assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function &&
+ "Not a function declarator!");
+ DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
+
+ if (FTI.hasPrototype) {
+ // FIXME: Diagnose arguments without names in C.
+ }
+
+ Scope *ParentScope = FnBodyScope->getParent();
+
+ DeclPtrTy DP = HandleDeclarator(ParentScope, D,
+ move(TemplateParameterLists),
+ /*IsFunctionDefinition=*/true);
+ if (FunctionTemplateDecl *FunctionTemplate
+ = dyn_cast_or_null<FunctionTemplateDecl>(DP.getAs<Decl>()))
+ return ActOnStartOfFunctionDef(FnBodyScope,
+ DeclPtrTy::make(FunctionTemplate->getTemplatedDecl()));
+ if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(DP.getAs<Decl>()))
+ return ActOnStartOfFunctionDef(FnBodyScope, DeclPtrTy::make(Function));
+ return DeclPtrTy();
+}
+
+/// \brief Diagnose cases where we have an explicit template specialization
+/// before/after an explicit template instantiation, producing diagnostics
+/// for those cases where they are required and determining whether the
+/// new specialization/instantiation will have any effect.
+///
+/// \param NewLoc the location of the new explicit specialization or
+/// instantiation.
+///
+/// \param NewTSK the kind of the new explicit specialization or instantiation.
+///
+/// \param PrevDecl the previous declaration of the entity.
+///
+/// \param PrevTSK the kind of the old explicit specialization or instantiatin.
+///
+/// \param PrevPointOfInstantiation if valid, indicates where the previus
+/// declaration was instantiated (either implicitly or explicitly).
+///
+/// \param SuppressNew will be set to true to indicate that the new
+/// specialization or instantiation has no effect and should be ignored.
+///
+/// \returns true if there was an error that should prevent the introduction of
+/// the new declaration into the AST, false otherwise.
+bool
+Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc,
+ TemplateSpecializationKind NewTSK,
+ NamedDecl *PrevDecl,
+ TemplateSpecializationKind PrevTSK,
+ SourceLocation PrevPointOfInstantiation,
+ bool &SuppressNew) {
+ SuppressNew = false;
+
+ switch (NewTSK) {
+ case TSK_Undeclared:
+ case TSK_ImplicitInstantiation:
+ assert(false && "Don't check implicit instantiations here");
+ return false;
+
+ case TSK_ExplicitSpecialization:
+ switch (PrevTSK) {
+ case TSK_Undeclared:
+ case TSK_ExplicitSpecialization:
+ // Okay, we're just specializing something that is either already
+ // explicitly specialized or has merely been mentioned without any
+ // instantiation.
+ return false;
+
+ case TSK_ImplicitInstantiation:
+ if (PrevPointOfInstantiation.isInvalid()) {
+ // The declaration itself has not actually been instantiated, so it is
+ // still okay to specialize it.
+ return false;
+ }
+ // Fall through
+
+ case TSK_ExplicitInstantiationDeclaration:
+ case TSK_ExplicitInstantiationDefinition:
+ assert((PrevTSK == TSK_ImplicitInstantiation ||
+ PrevPointOfInstantiation.isValid()) &&
+ "Explicit instantiation without point of instantiation?");
+
+ // C++ [temp.expl.spec]p6:
+ // If a template, a member template or the member of a class template
+ // is explicitly specialized then that specialization shall be declared
+ // before the first use of that specialization that would cause an
+ // implicit instantiation to take place, in every translation unit in
+ // which such a use occurs; no diagnostic is required.
+ Diag(NewLoc, diag::err_specialization_after_instantiation)
+ << PrevDecl;
+ Diag(PrevPointOfInstantiation, diag::note_instantiation_required_here)
+ << (PrevTSK != TSK_ImplicitInstantiation);
+
+ return true;
+ }
+ break;
+
+ case TSK_ExplicitInstantiationDeclaration:
+ switch (PrevTSK) {
+ case TSK_ExplicitInstantiationDeclaration:
+ // This explicit instantiation declaration is redundant (that's okay).
+ SuppressNew = true;
+ return false;
+
+ case TSK_Undeclared:
+ case TSK_ImplicitInstantiation:
+ // We're explicitly instantiating something that may have already been
+ // implicitly instantiated; that's fine.
+ return false;
+
+ case TSK_ExplicitSpecialization:
+ // C++0x [temp.explicit]p4:
+ // For a given set of template parameters, if an explicit instantiation
+ // of a template appears after a declaration of an explicit
+ // specialization for that template, the explicit instantiation has no
+ // effect.
+ return false;
+
+ case TSK_ExplicitInstantiationDefinition:
+ // C++0x [temp.explicit]p10:
+ // If an entity is the subject of both an explicit instantiation
+ // declaration and an explicit instantiation definition in the same
+ // translation unit, the definition shall follow the declaration.
+ Diag(NewLoc,
+ diag::err_explicit_instantiation_declaration_after_definition);
+ Diag(PrevPointOfInstantiation,
+ diag::note_explicit_instantiation_definition_here);
+ assert(PrevPointOfInstantiation.isValid() &&
+ "Explicit instantiation without point of instantiation?");
+ SuppressNew = true;
+ return false;
+ }
+ break;
+
+ case TSK_ExplicitInstantiationDefinition:
+ switch (PrevTSK) {
+ case TSK_Undeclared:
+ case TSK_ImplicitInstantiation:
+ // We're explicitly instantiating something that may have already been
+ // implicitly instantiated; that's fine.
+ return false;
+
+ case TSK_ExplicitSpecialization:
+ // C++ DR 259, C++0x [temp.explicit]p4:
+ // For a given set of template parameters, if an explicit
+ // instantiation of a template appears after a declaration of
+ // an explicit specialization for that template, the explicit
+ // instantiation has no effect.
+ //
+ // In C++98/03 mode, we only give an extension warning here, because it
+ // is not not harmful to try to explicitly instantiate something that
+ // has been explicitly specialized.
+ if (!getLangOptions().CPlusPlus0x) {
+ Diag(NewLoc, diag::ext_explicit_instantiation_after_specialization)
+ << PrevDecl;
+ Diag(PrevDecl->getLocation(),
+ diag::note_previous_template_specialization);
+ }
+ SuppressNew = true;
+ return false;
+
+ case TSK_ExplicitInstantiationDeclaration:
+ // We're explicity instantiating a definition for something for which we
+ // were previously asked to suppress instantiations. That's fine.
+ return false;
+
+ case TSK_ExplicitInstantiationDefinition:
+ // C++0x [temp.spec]p5:
+ // For a given template and a given set of template-arguments,
+ // - an explicit instantiation definition shall appear at most once
+ // in a program,
+ Diag(NewLoc, diag::err_explicit_instantiation_duplicate)
+ << PrevDecl;
+ Diag(PrevPointOfInstantiation,
+ diag::note_previous_explicit_instantiation);
+ SuppressNew = true;
+ return false;
+ }
+ break;
+ }
+
+ assert(false && "Missing specialization/instantiation case?");
+
+ return false;
+}
+
+/// \brief Perform semantic analysis for the given function template
+/// specialization.
+///
+/// This routine performs all of the semantic analysis required for an
+/// explicit function template specialization. On successful completion,
+/// the function declaration \p FD will become a function template
+/// specialization.
+///
+/// \param FD the function declaration, which will be updated to become a
+/// function template specialization.
+///
+/// \param HasExplicitTemplateArgs whether any template arguments were
+/// explicitly provided.
+///
+/// \param LAngleLoc the location of the left angle bracket ('<'), if
+/// template arguments were explicitly provided.
+///
+/// \param ExplicitTemplateArgs the explicitly-provided template arguments,
+/// if any.
+///
+/// \param NumExplicitTemplateArgs the number of explicitly-provided template
+/// arguments. This number may be zero even when HasExplicitTemplateArgs is
+/// true as in, e.g., \c void sort<>(char*, char*);
+///
+/// \param RAngleLoc the location of the right angle bracket ('>'), if
+/// template arguments were explicitly provided.
+///
+/// \param PrevDecl the set of declarations that
+bool
+Sema::CheckFunctionTemplateSpecialization(FunctionDecl *FD,
+ const TemplateArgumentListInfo *ExplicitTemplateArgs,
+ LookupResult &Previous) {
+ // The set of function template specializations that could match this
+ // explicit function template specialization.
+ UnresolvedSet<8> Candidates;
+
+ DeclContext *FDLookupContext = FD->getDeclContext()->getLookupContext();
+ for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
+ I != E; ++I) {
+ NamedDecl *Ovl = (*I)->getUnderlyingDecl();
+ if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Ovl)) {
+ // Only consider templates found within the same semantic lookup scope as
+ // FD.
+ if (!FDLookupContext->Equals(Ovl->getDeclContext()->getLookupContext()))
+ continue;
+
+ // C++ [temp.expl.spec]p11:
+ // A trailing template-argument can be left unspecified in the
+ // template-id naming an explicit function template specialization
+ // provided it can be deduced from the function argument type.
+ // Perform template argument deduction to determine whether we may be
+ // specializing this template.
+ // FIXME: It is somewhat wasteful to build
+ TemplateDeductionInfo Info(Context, FD->getLocation());
+ FunctionDecl *Specialization = 0;
+ if (TemplateDeductionResult TDK
+ = DeduceTemplateArguments(FunTmpl, ExplicitTemplateArgs,
+ FD->getType(),
+ Specialization,
+ Info)) {
+ // FIXME: Template argument deduction failed; record why it failed, so
+ // that we can provide nifty diagnostics.
+ (void)TDK;
+ continue;
+ }
+
+ // Record this candidate.
+ Candidates.addDecl(Specialization, I.getAccess());
+ }
+ }
+
+ // Find the most specialized function template.
+ UnresolvedSetIterator Result
+ = getMostSpecialized(Candidates.begin(), Candidates.end(),
+ TPOC_Other, FD->getLocation(),
+ PartialDiagnostic(diag::err_function_template_spec_no_match)
+ << FD->getDeclName(),
+ PartialDiagnostic(diag::err_function_template_spec_ambiguous)
+ << FD->getDeclName() << (ExplicitTemplateArgs != 0),
+ PartialDiagnostic(diag::note_function_template_spec_matched));
+ if (Result == Candidates.end())
+ return true;
+
+ // Ignore access information; it doesn't figure into redeclaration checking.
+ FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
+
+ // FIXME: Check if the prior specialization has a point of instantiation.
+ // If so, we have run afoul of .
+
+ // Check the scope of this explicit specialization.
+ if (CheckTemplateSpecializationScope(*this,
+ Specialization->getPrimaryTemplate(),
+ Specialization, FD->getLocation(),
+ false))
+ return true;
+
+ // C++ [temp.expl.spec]p6:
+ // If a template, a member template or the member of a class template is
+ // explicitly specialized then that specialization shall be declared
+ // before the first use of that specialization that would cause an implicit
+ // instantiation to take place, in every translation unit in which such a
+ // use occurs; no diagnostic is required.
+ FunctionTemplateSpecializationInfo *SpecInfo
+ = Specialization->getTemplateSpecializationInfo();
+ assert(SpecInfo && "Function template specialization info missing?");
+ if (SpecInfo->getPointOfInstantiation().isValid()) {
+ Diag(FD->getLocation(), diag::err_specialization_after_instantiation)
+ << FD;
+ Diag(SpecInfo->getPointOfInstantiation(),
+ diag::note_instantiation_required_here)
+ << (Specialization->getTemplateSpecializationKind()
+ != TSK_ImplicitInstantiation);
+ return true;
+ }
+
+ // Mark the prior declaration as an explicit specialization, so that later
+ // clients know that this is an explicit specialization.
+ SpecInfo->setTemplateSpecializationKind(TSK_ExplicitSpecialization);
+
+ // Turn the given function declaration into a function template
+ // specialization, with the template arguments from the previous
+ // specialization.
+ FD->setFunctionTemplateSpecialization(Context,
+ Specialization->getPrimaryTemplate(),
+ new (Context) TemplateArgumentList(
+ *Specialization->getTemplateSpecializationArgs()),
+ /*InsertPos=*/0,
+ TSK_ExplicitSpecialization);
+
+ // The "previous declaration" for this function template specialization is
+ // the prior function template specialization.
+ Previous.clear();
+ Previous.addDecl(Specialization);
+ return false;
+}
+
+/// \brief Perform semantic analysis for the given non-template member
+/// specialization.
+///
+/// This routine performs all of the semantic analysis required for an
+/// explicit member function specialization. On successful completion,
+/// the function declaration \p FD will become a member function
+/// specialization.
+///
+/// \param Member the member declaration, which will be updated to become a
+/// specialization.
+///
+/// \param Previous the set of declarations, one of which may be specialized
+/// by this function specialization; the set will be modified to contain the
+/// redeclared member.
+bool
+Sema::CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous) {
+ assert(!isa<TemplateDecl>(Member) && "Only for non-template members");
+
+ // Try to find the member we are instantiating.
+ NamedDecl *Instantiation = 0;
+ NamedDecl *InstantiatedFrom = 0;
+ MemberSpecializationInfo *MSInfo = 0;
+
+ if (Previous.empty()) {
+ // Nowhere to look anyway.
+ } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Member)) {
+ for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
+ I != E; ++I) {
+ NamedDecl *D = (*I)->getUnderlyingDecl();
+ if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
+ if (Context.hasSameType(Function->getType(), Method->getType())) {
+ Instantiation = Method;
+ InstantiatedFrom = Method->getInstantiatedFromMemberFunction();
+ MSInfo = Method->getMemberSpecializationInfo();
+ break;
+ }
+ }
+ }
+ } else if (isa<VarDecl>(Member)) {
+ VarDecl *PrevVar;
+ if (Previous.isSingleResult() &&
+ (PrevVar = dyn_cast<VarDecl>(Previous.getFoundDecl())))
+ if (PrevVar->isStaticDataMember()) {
+ Instantiation = PrevVar;
+ InstantiatedFrom = PrevVar->getInstantiatedFromStaticDataMember();
+ MSInfo = PrevVar->getMemberSpecializationInfo();
+ }
+ } else if (isa<RecordDecl>(Member)) {
+ CXXRecordDecl *PrevRecord;
+ if (Previous.isSingleResult() &&
+ (PrevRecord = dyn_cast<CXXRecordDecl>(Previous.getFoundDecl()))) {
+ Instantiation = PrevRecord;
+ InstantiatedFrom = PrevRecord->getInstantiatedFromMemberClass();
+ MSInfo = PrevRecord->getMemberSpecializationInfo();
+ }
+ }
+
+ if (!Instantiation) {
+ // There is no previous declaration that matches. Since member
+ // specializations are always out-of-line, the caller will complain about
+ // this mismatch later.
+ return false;
+ }
+
+ // Make sure that this is a specialization of a member.
+ if (!InstantiatedFrom) {
+ Diag(Member->getLocation(), diag::err_spec_member_not_instantiated)
+ << Member;
+ Diag(Instantiation->getLocation(), diag::note_specialized_decl);
+ return true;
+ }
+
+ // C++ [temp.expl.spec]p6:
+ // If a template, a member template or the member of a class template is
+ // explicitly specialized then that spe- cialization shall be declared
+ // before the first use of that specialization that would cause an implicit
+ // instantiation to take place, in every translation unit in which such a
+ // use occurs; no diagnostic is required.
+ assert(MSInfo && "Member specialization info missing?");
+ if (MSInfo->getPointOfInstantiation().isValid()) {
+ Diag(Member->getLocation(), diag::err_specialization_after_instantiation)
+ << Member;
+ Diag(MSInfo->getPointOfInstantiation(),
+ diag::note_instantiation_required_here)
+ << (MSInfo->getTemplateSpecializationKind() != TSK_ImplicitInstantiation);
+ return true;
+ }
+
+ // Check the scope of this explicit specialization.
+ if (CheckTemplateSpecializationScope(*this,
+ InstantiatedFrom,
+ Instantiation, Member->getLocation(),
+ false))
+ return true;
+
+ // Note that this is an explicit instantiation of a member.
+ // the original declaration to note that it is an explicit specialization
+ // (if it was previously an implicit instantiation). This latter step
+ // makes bookkeeping easier.
+ if (isa<FunctionDecl>(Member)) {
+ FunctionDecl *InstantiationFunction = cast<FunctionDecl>(Instantiation);
+ if (InstantiationFunction->getTemplateSpecializationKind() ==
+ TSK_ImplicitInstantiation) {
+ InstantiationFunction->setTemplateSpecializationKind(
+ TSK_ExplicitSpecialization);
+ InstantiationFunction->setLocation(Member->getLocation());
+ }
+
+ cast<FunctionDecl>(Member)->setInstantiationOfMemberFunction(
+ cast<CXXMethodDecl>(InstantiatedFrom),
+ TSK_ExplicitSpecialization);
+ } else if (isa<VarDecl>(Member)) {
+ VarDecl *InstantiationVar = cast<VarDecl>(Instantiation);
+ if (InstantiationVar->getTemplateSpecializationKind() ==
+ TSK_ImplicitInstantiation) {
+ InstantiationVar->setTemplateSpecializationKind(
+ TSK_ExplicitSpecialization);
+ InstantiationVar->setLocation(Member->getLocation());
+ }
+
+ Context.setInstantiatedFromStaticDataMember(cast<VarDecl>(Member),
+ cast<VarDecl>(InstantiatedFrom),
+ TSK_ExplicitSpecialization);
+ } else {
+ assert(isa<CXXRecordDecl>(Member) && "Only member classes remain");
+ CXXRecordDecl *InstantiationClass = cast<CXXRecordDecl>(Instantiation);
+ if (InstantiationClass->getTemplateSpecializationKind() ==
+ TSK_ImplicitInstantiation) {
+ InstantiationClass->setTemplateSpecializationKind(
+ TSK_ExplicitSpecialization);
+ InstantiationClass->setLocation(Member->getLocation());
+ }
+
+ cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass(
+ cast<CXXRecordDecl>(InstantiatedFrom),
+ TSK_ExplicitSpecialization);
+ }
+
+ // Save the caller the trouble of having to figure out which declaration
+ // this specialization matches.
+ Previous.clear();
+ Previous.addDecl(Instantiation);
+ return false;
+}
+
+/// \brief Check the scope of an explicit instantiation.
+static void CheckExplicitInstantiationScope(Sema &S, NamedDecl *D,
+ SourceLocation InstLoc,
+ bool WasQualifiedName) {
+ DeclContext *ExpectedContext
+ = D->getDeclContext()->getEnclosingNamespaceContext()->getLookupContext();
+ DeclContext *CurContext = S.CurContext->getLookupContext();
+
+ // C++0x [temp.explicit]p2:
+ // An explicit instantiation shall appear in an enclosing namespace of its
+ // template.
+ //
+ // This is DR275, which we do not retroactively apply to C++98/03.
+ if (S.getLangOptions().CPlusPlus0x &&
+ !CurContext->Encloses(ExpectedContext)) {
+ if (NamespaceDecl *NS = dyn_cast<NamespaceDecl>(ExpectedContext))
+ S.Diag(InstLoc, diag::err_explicit_instantiation_out_of_scope)
+ << D << NS;
+ else
+ S.Diag(InstLoc, diag::err_explicit_instantiation_must_be_global)
+ << D;
+ S.Diag(D->getLocation(), diag::note_explicit_instantiation_here);
+ return;
+ }
+
+ // C++0x [temp.explicit]p2:
+ // If the name declared in the explicit instantiation is an unqualified
+ // name, the explicit instantiation shall appear in the namespace where
+ // its template is declared or, if that namespace is inline (7.3.1), any
+ // namespace from its enclosing namespace set.
+ if (WasQualifiedName)
+ return;
+
+ if (CurContext->Equals(ExpectedContext))
+ return;
+
+ S.Diag(InstLoc, diag::err_explicit_instantiation_unqualified_wrong_namespace)
+ << D << ExpectedContext;
+ S.Diag(D->getLocation(), diag::note_explicit_instantiation_here);
+}
+
+/// \brief Determine whether the given scope specifier has a template-id in it.
+static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec &SS) {
+ if (!SS.isSet())
+ return false;
+
+ // C++0x [temp.explicit]p2:
+ // If the explicit instantiation is for a member function, a member class
+ // or a static data member of a class template specialization, the name of
+ // the class template specialization in the qualified-id for the member
+ // name shall be a simple-template-id.
+ //
+ // C++98 has the same restriction, just worded differently.
+ for (NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
+ NNS; NNS = NNS->getPrefix())
+ if (Type *T = NNS->getAsType())
+ if (isa<TemplateSpecializationType>(T))
+ return true;
+
+ return false;
+}
+
+// Explicit instantiation of a class template specialization
+// FIXME: Implement extern template semantics
+Sema::DeclResult
+Sema::ActOnExplicitInstantiation(Scope *S,
+ SourceLocation ExternLoc,
+ SourceLocation TemplateLoc,
+ unsigned TagSpec,
+ SourceLocation KWLoc,
+ const CXXScopeSpec &SS,
+ TemplateTy TemplateD,
+ SourceLocation TemplateNameLoc,
+ SourceLocation LAngleLoc,
+ ASTTemplateArgsPtr TemplateArgsIn,
+ SourceLocation RAngleLoc,
+ AttributeList *Attr) {
+ // Find the class template we're specializing
+ TemplateName Name = TemplateD.getAsVal<TemplateName>();
+ ClassTemplateDecl *ClassTemplate
+ = cast<ClassTemplateDecl>(Name.getAsTemplateDecl());
+
+ // Check that the specialization uses the same tag kind as the
+ // original template.
+ TagDecl::TagKind Kind;
+ switch (TagSpec) {
+ default: assert(0 && "Unknown tag type!");
+ case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break;
+ case DeclSpec::TST_union: Kind = TagDecl::TK_union; break;
+ case DeclSpec::TST_class: Kind = TagDecl::TK_class; break;
+ }
+ if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
+ Kind, KWLoc,
+ *ClassTemplate->getIdentifier())) {
+ Diag(KWLoc, diag::err_use_with_wrong_tag)
+ << ClassTemplate
+ << CodeModificationHint::CreateReplacement(KWLoc,
+ ClassTemplate->getTemplatedDecl()->getKindName());
+ Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
+ diag::note_previous_use);
+ Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
+ }
+
+ // C++0x [temp.explicit]p2:
+ // There are two forms of explicit instantiation: an explicit instantiation
+ // definition and an explicit instantiation declaration. An explicit
+ // instantiation declaration begins with the extern keyword. [...]
+ TemplateSpecializationKind TSK
+ = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
+ : TSK_ExplicitInstantiationDeclaration;
+
+ // Translate the parser's template argument list in our AST format.
+ TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
+ translateTemplateArguments(TemplateArgsIn, TemplateArgs);
+
+ // Check that the template argument list is well-formed for this
+ // template.
+ TemplateArgumentListBuilder Converted(ClassTemplate->getTemplateParameters(),
+ TemplateArgs.size());
+ if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
+ TemplateArgs, false, Converted))
+ return true;
+
+ assert((Converted.structuredSize() ==
+ ClassTemplate->getTemplateParameters()->size()) &&
+ "Converted template argument list is too short!");
+
+ // Find the class template specialization declaration that
+ // corresponds to these arguments.
+ llvm::FoldingSetNodeID ID;
+ ClassTemplateSpecializationDecl::Profile(ID,
+ Converted.getFlatArguments(),
+ Converted.flatSize(),
+ Context);
+ void *InsertPos = 0;
+ ClassTemplateSpecializationDecl *PrevDecl
+ = ClassTemplate->getSpecializations().FindNodeOrInsertPos(ID, InsertPos);
+
+ // C++0x [temp.explicit]p2:
+ // [...] An explicit instantiation shall appear in an enclosing
+ // namespace of its template. [...]
+ //
+ // This is C++ DR 275.
+ CheckExplicitInstantiationScope(*this, ClassTemplate, TemplateNameLoc,
+ SS.isSet());
+
+ ClassTemplateSpecializationDecl *Specialization = 0;
+
+ bool ReusedDecl = false;
+ if (PrevDecl) {
+ bool SuppressNew = false;
+ if (CheckSpecializationInstantiationRedecl(TemplateNameLoc, TSK,
+ PrevDecl,
+ PrevDecl->getSpecializationKind(),
+ PrevDecl->getPointOfInstantiation(),
+ SuppressNew))
+ return DeclPtrTy::make(PrevDecl);
+
+ if (SuppressNew)
+ return DeclPtrTy::make(PrevDecl);
+
+ if (PrevDecl->getSpecializationKind() == TSK_ImplicitInstantiation ||
+ PrevDecl->getSpecializationKind() == TSK_Undeclared) {
+ // Since the only prior class template specialization with these
+ // arguments was referenced but not declared, reuse that
+ // declaration node as our own, updating its source location to
+ // reflect our new declaration.
+ Specialization = PrevDecl;
+ Specialization->setLocation(TemplateNameLoc);
+ PrevDecl = 0;
+ ReusedDecl = true;
+ }
+ }
+
+ if (!Specialization) {
+ // Create a new class template specialization declaration node for
+ // this explicit specialization.
+ Specialization
+ = ClassTemplateSpecializationDecl::Create(Context,
+ ClassTemplate->getDeclContext(),
+ TemplateNameLoc,
+ ClassTemplate,
+ Converted, PrevDecl);
+
+ if (PrevDecl) {
+ // Remove the previous declaration from the folding set, since we want
+ // to introduce a new declaration.
+ ClassTemplate->getSpecializations().RemoveNode(PrevDecl);
+ ClassTemplate->getSpecializations().FindNodeOrInsertPos(ID, InsertPos);
+ }
+
+ // Insert the new specialization.
+ ClassTemplate->getSpecializations().InsertNode(Specialization, InsertPos);
+ }
+
+ // Build the fully-sugared type for this explicit instantiation as
+ // the user wrote in the explicit instantiation itself. This means
+ // that we'll pretty-print the type retrieved from the
+ // specialization's declaration the way that the user actually wrote
+ // the explicit instantiation, rather than formatting the name based
+ // on the "canonical" representation used to store the template
+ // arguments in the specialization.
+ QualType WrittenTy
+ = Context.getTemplateSpecializationType(Name, TemplateArgs,
+ Context.getTypeDeclType(Specialization));
+ Specialization->setTypeAsWritten(WrittenTy);
+ TemplateArgsIn.release();
+
+ if (!ReusedDecl) {
+ // Add the explicit instantiation into its lexical context. However,
+ // since explicit instantiations are never found by name lookup, we
+ // just put it into the declaration context directly.
+ Specialization->setLexicalDeclContext(CurContext);
+ CurContext->addDecl(Specialization);
+ }
+
+ // C++ [temp.explicit]p3:
+ // A definition of a class template or class member template
+ // shall be in scope at the point of the explicit instantiation of
+ // the class template or class member template.
+ //
+ // This check comes when we actually try to perform the
+ // instantiation.
+ ClassTemplateSpecializationDecl *Def
+ = cast_or_null<ClassTemplateSpecializationDecl>(
+ Specialization->getDefinition(Context));
+ if (!Def)
+ InstantiateClassTemplateSpecialization(TemplateNameLoc, Specialization, TSK);
+
+ // Instantiate the members of this class template specialization.
+ Def = cast_or_null<ClassTemplateSpecializationDecl>(
+ Specialization->getDefinition(Context));
+ if (Def)
+ InstantiateClassTemplateSpecializationMembers(TemplateNameLoc, Def, TSK);
+
+ return DeclPtrTy::make(Specialization);
+}
+
+// Explicit instantiation of a member class of a class template.
+Sema::DeclResult
+Sema::ActOnExplicitInstantiation(Scope *S,
+ SourceLocation ExternLoc,
+ SourceLocation TemplateLoc,
+ unsigned TagSpec,
+ SourceLocation KWLoc,
+ const CXXScopeSpec &SS,
+ IdentifierInfo *Name,
+ SourceLocation NameLoc,
+ AttributeList *Attr) {
+
+ bool Owned = false;
+ bool IsDependent = false;
+ DeclPtrTy TagD = ActOnTag(S, TagSpec, Action::TUK_Reference,
+ KWLoc, SS, Name, NameLoc, Attr, AS_none,
+ MultiTemplateParamsArg(*this, 0, 0),
+ Owned, IsDependent);
+ assert(!IsDependent && "explicit instantiation of dependent name not yet handled");
+
+ if (!TagD)
+ return true;
+
+ TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>());
+ if (Tag->isEnum()) {
+ Diag(TemplateLoc, diag::err_explicit_instantiation_enum)
+ << Context.getTypeDeclType(Tag);
+ return true;
+ }
+
+ if (Tag->isInvalidDecl())
+ return true;
+
+ CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag);
+ CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass();
+ if (!Pattern) {
+ Diag(TemplateLoc, diag::err_explicit_instantiation_nontemplate_type)
+ << Context.getTypeDeclType(Record);
+ Diag(Record->getLocation(), diag::note_nontemplate_decl_here);
+ return true;
+ }
+
+ // C++0x [temp.explicit]p2:
+ // If the explicit instantiation is for a class or member class, the
+ // elaborated-type-specifier in the declaration shall include a
+ // simple-template-id.
+ //
+ // C++98 has the same restriction, just worded differently.
+ if (!ScopeSpecifierHasTemplateId(SS))
+ Diag(TemplateLoc, diag::err_explicit_instantiation_without_qualified_id)
+ << Record << SS.getRange();
+
+ // C++0x [temp.explicit]p2:
+ // There are two forms of explicit instantiation: an explicit instantiation
+ // definition and an explicit instantiation declaration. An explicit
+ // instantiation declaration begins with the extern keyword. [...]
+ TemplateSpecializationKind TSK
+ = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
+ : TSK_ExplicitInstantiationDeclaration;
+
+ // C++0x [temp.explicit]p2:
+ // [...] An explicit instantiation shall appear in an enclosing
+ // namespace of its template. [...]
+ //
+ // This is C++ DR 275.
+ CheckExplicitInstantiationScope(*this, Record, NameLoc, true);
+
+ // Verify that it is okay to explicitly instantiate here.
+ CXXRecordDecl *PrevDecl
+ = cast_or_null<CXXRecordDecl>(Record->getPreviousDeclaration());
+ if (!PrevDecl && Record->getDefinition(Context))
+ PrevDecl = Record;
+ if (PrevDecl) {
+ MemberSpecializationInfo *MSInfo = PrevDecl->getMemberSpecializationInfo();
+ bool SuppressNew = false;
+ assert(MSInfo && "No member specialization information?");
+ if (CheckSpecializationInstantiationRedecl(TemplateLoc, TSK,
+ PrevDecl,
+ MSInfo->getTemplateSpecializationKind(),
+ MSInfo->getPointOfInstantiation(),
+ SuppressNew))
+ return true;
+ if (SuppressNew)
+ return TagD;
+ }
+
+ CXXRecordDecl *RecordDef
+ = cast_or_null<CXXRecordDecl>(Record->getDefinition(Context));
+ if (!RecordDef) {
+ // C++ [temp.explicit]p3:
+ // A definition of a member class of a class template shall be in scope
+ // at the point of an explicit instantiation of the member class.
+ CXXRecordDecl *Def
+ = cast_or_null<CXXRecordDecl>(Pattern->getDefinition(Context));
+ if (!Def) {
+ Diag(TemplateLoc, diag::err_explicit_instantiation_undefined_member)
+ << 0 << Record->getDeclName() << Record->getDeclContext();
+ Diag(Pattern->getLocation(), diag::note_forward_declaration)
+ << Pattern;
+ return true;
+ } else {
+ if (InstantiateClass(NameLoc, Record, Def,
+ getTemplateInstantiationArgs(Record),
+ TSK))
+ return true;
+
+ RecordDef = cast_or_null<CXXRecordDecl>(Record->getDefinition(Context));
+ if (!RecordDef)
+ return true;
+ }
+ }
+
+ // Instantiate all of the members of the class.
+ InstantiateClassMembers(NameLoc, RecordDef,
+ getTemplateInstantiationArgs(Record), TSK);
+
+ // FIXME: We don't have any representation for explicit instantiations of
+ // member classes. Such a representation is not needed for compilation, but it
+ // should be available for clients that want to see all of the declarations in
+ // the source code.
+ return TagD;
+}
+
+Sema::DeclResult Sema::ActOnExplicitInstantiation(Scope *S,
+ SourceLocation ExternLoc,
+ SourceLocation TemplateLoc,
+ Declarator &D) {
+ // Explicit instantiations always require a name.
+ DeclarationName Name = GetNameForDeclarator(D);
+ if (!Name) {
+ if (!D.isInvalidType())
+ Diag(D.getDeclSpec().getSourceRange().getBegin(),
+ diag::err_explicit_instantiation_requires_name)
+ << D.getDeclSpec().getSourceRange()
+ << D.getSourceRange();
+
+ return true;
+ }
+
+ // The scope passed in may not be a decl scope. Zip up the scope tree until
+ // we find one that is.
+ while ((S->getFlags() & Scope::DeclScope) == 0 ||
+ (S->getFlags() & Scope::TemplateParamScope) != 0)
+ S = S->getParent();
+
+ // Determine the type of the declaration.
+ QualType R = GetTypeForDeclarator(D, S, 0);
+ if (R.isNull())
+ return true;
+
+ if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
+ // Cannot explicitly instantiate a typedef.
+ Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef)
+ << Name;
+ return true;
+ }
+
+ // C++0x [temp.explicit]p1:
+ // [...] An explicit instantiation of a function template shall not use the
+ // inline or constexpr specifiers.
+ // Presumably, this also applies to member functions of class templates as
+ // well.
+ if (D.getDeclSpec().isInlineSpecified() && getLangOptions().CPlusPlus0x)
+ Diag(D.getDeclSpec().getInlineSpecLoc(),
+ diag::err_explicit_instantiation_inline)
+ <<CodeModificationHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
+
+ // FIXME: check for constexpr specifier.
+
+ // C++0x [temp.explicit]p2:
+ // There are two forms of explicit instantiation: an explicit instantiation
+ // definition and an explicit instantiation declaration. An explicit
+ // instantiation declaration begins with the extern keyword. [...]
+ TemplateSpecializationKind TSK
+ = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
+ : TSK_ExplicitInstantiationDeclaration;
+
+ LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName);
+ LookupParsedName(Previous, S, &D.getCXXScopeSpec());
+
+ if (!R->isFunctionType()) {
+ // C++ [temp.explicit]p1:
+ // A [...] static data member of a class template can be explicitly
+ // instantiated from the member definition associated with its class
+ // template.
+ if (Previous.isAmbiguous())
+ return true;
+
+ VarDecl *Prev = Previous.getAsSingle<VarDecl>();
+ if (!Prev || !Prev->isStaticDataMember()) {
+ // We expect to see a data data member here.
+ Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known)
+ << Name;
+ for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
+ P != PEnd; ++P)
+ Diag((*P)->getLocation(), diag::note_explicit_instantiation_here);
+ return true;
+ }
+
+ if (!Prev->getInstantiatedFromStaticDataMember()) {
+ // FIXME: Check for explicit specialization?
+ Diag(D.getIdentifierLoc(),
+ diag::err_explicit_instantiation_data_member_not_instantiated)
+ << Prev;
+ Diag(Prev->getLocation(), diag::note_explicit_instantiation_here);
+ // FIXME: Can we provide a note showing where this was declared?
+ return true;
+ }
+
+ // C++0x [temp.explicit]p2:
+ // If the explicit instantiation is for a member function, a member class
+ // or a static data member of a class template specialization, the name of
+ // the class template specialization in the qualified-id for the member
+ // name shall be a simple-template-id.
+ //
+ // C++98 has the same restriction, just worded differently.
+ if (!ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()))
+ Diag(D.getIdentifierLoc(),
+ diag::err_explicit_instantiation_without_qualified_id)
+ << Prev << D.getCXXScopeSpec().getRange();
+
+ // Check the scope of this explicit instantiation.
+ CheckExplicitInstantiationScope(*this, Prev, D.getIdentifierLoc(), true);
+
+ // Verify that it is okay to explicitly instantiate here.
+ MemberSpecializationInfo *MSInfo = Prev->getMemberSpecializationInfo();
+ assert(MSInfo && "Missing static data member specialization info?");
+ bool SuppressNew = false;
+ if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, Prev,
+ MSInfo->getTemplateSpecializationKind(),
+ MSInfo->getPointOfInstantiation(),
+ SuppressNew))
+ return true;
+ if (SuppressNew)
+ return DeclPtrTy();
+
+ // Instantiate static data member.
+ Prev->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
+ if (TSK == TSK_ExplicitInstantiationDefinition)
+ InstantiateStaticDataMemberDefinition(D.getIdentifierLoc(), Prev, false,
+ /*DefinitionRequired=*/true);
+
+ // FIXME: Create an ExplicitInstantiation node?
+ return DeclPtrTy();
+ }
+
+ // If the declarator is a template-id, translate the parser's template
+ // argument list into our AST format.
+ bool HasExplicitTemplateArgs = false;
+ TemplateArgumentListInfo TemplateArgs;
+ if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
+ TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
+ TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
+ TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
+ ASTTemplateArgsPtr TemplateArgsPtr(*this,
+ TemplateId->getTemplateArgs(),
+ TemplateId->NumArgs);
+ translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
+ HasExplicitTemplateArgs = true;
+ TemplateArgsPtr.release();
+ }
+
+ // C++ [temp.explicit]p1:
+ // A [...] function [...] can be explicitly instantiated from its template.
+ // A member function [...] of a class template can be explicitly
+ // instantiated from the member definition associated with its class
+ // template.
+ UnresolvedSet<8> Matches;
+ for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
+ P != PEnd; ++P) {
+ NamedDecl *Prev = *P;
+ if (!HasExplicitTemplateArgs) {
+ if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Prev)) {
+ if (Context.hasSameUnqualifiedType(Method->getType(), R)) {
+ Matches.clear();
+
+ Matches.addDecl(Method, P.getAccess());
+ if (Method->getTemplateSpecializationKind() == TSK_Undeclared)
+ break;
+ }
+ }
+ }
+
+ FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Prev);
+ if (!FunTmpl)
+ continue;
+
+ TemplateDeductionInfo Info(Context, D.getIdentifierLoc());
+ FunctionDecl *Specialization = 0;
+ if (TemplateDeductionResult TDK
+ = DeduceTemplateArguments(FunTmpl,
+ (HasExplicitTemplateArgs ? &TemplateArgs : 0),
+ R, Specialization, Info)) {
+ // FIXME: Keep track of almost-matches?
+ (void)TDK;
+ continue;
+ }
+
+ Matches.addDecl(Specialization, P.getAccess());
+ }
+
+ // Find the most specialized function template specialization.
+ UnresolvedSetIterator Result
+ = getMostSpecialized(Matches.begin(), Matches.end(), TPOC_Other,
+ D.getIdentifierLoc(),
+ PartialDiagnostic(diag::err_explicit_instantiation_not_known) << Name,
+ PartialDiagnostic(diag::err_explicit_instantiation_ambiguous) << Name,
+ PartialDiagnostic(diag::note_explicit_instantiation_candidate));
+
+ if (Result == Matches.end())
+ return true;
+
+ // Ignore access control bits, we don't need them for redeclaration checking.
+ FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
+
+ if (Specialization->getTemplateSpecializationKind() == TSK_Undeclared) {
+ Diag(D.getIdentifierLoc(),
+ diag::err_explicit_instantiation_member_function_not_instantiated)
+ << Specialization
+ << (Specialization->getTemplateSpecializationKind() ==
+ TSK_ExplicitSpecialization);
+ Diag(Specialization->getLocation(), diag::note_explicit_instantiation_here);
+ return true;
+ }
+
+ FunctionDecl *PrevDecl = Specialization->getPreviousDeclaration();
+ if (!PrevDecl && Specialization->isThisDeclarationADefinition())
+ PrevDecl = Specialization;
+
+ if (PrevDecl) {
+ bool SuppressNew = false;
+ if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK,
+ PrevDecl,
+ PrevDecl->getTemplateSpecializationKind(),
+ PrevDecl->getPointOfInstantiation(),
+ SuppressNew))
+ return true;
+
+ // FIXME: We may still want to build some representation of this
+ // explicit specialization.
+ if (SuppressNew)
+ return DeclPtrTy();
+ }
+
+ Specialization->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
+
+ if (TSK == TSK_ExplicitInstantiationDefinition)
+ InstantiateFunctionDefinition(D.getIdentifierLoc(), Specialization,
+ false, /*DefinitionRequired=*/true);
+
+ // C++0x [temp.explicit]p2:
+ // If the explicit instantiation is for a member function, a member class
+ // or a static data member of a class template specialization, the name of
+ // the class template specialization in the qualified-id for the member
+ // name shall be a simple-template-id.
+ //
+ // C++98 has the same restriction, just worded differently.
+ FunctionTemplateDecl *FunTmpl = Specialization->getPrimaryTemplate();
+ if (D.getName().getKind() != UnqualifiedId::IK_TemplateId && !FunTmpl &&
+ D.getCXXScopeSpec().isSet() &&
+ !ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()))
+ Diag(D.getIdentifierLoc(),
+ diag::err_explicit_instantiation_without_qualified_id)
+ << Specialization << D.getCXXScopeSpec().getRange();
+
+ CheckExplicitInstantiationScope(*this,
+ FunTmpl? (NamedDecl *)FunTmpl
+ : Specialization->getInstantiatedFromMemberFunction(),
+ D.getIdentifierLoc(),
+ D.getCXXScopeSpec().isSet());
+
+ // FIXME: Create some kind of ExplicitInstantiationDecl here.
+ return DeclPtrTy();
+}
+
+Sema::TypeResult
+Sema::ActOnDependentTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
+ const CXXScopeSpec &SS, IdentifierInfo *Name,
+ SourceLocation TagLoc, SourceLocation NameLoc) {
+ // This has to hold, because SS is expected to be defined.
+ assert(Name && "Expected a name in a dependent tag");
+
+ NestedNameSpecifier *NNS
+ = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
+ if (!NNS)
+ return true;
+
+ QualType T = CheckTypenameType(NNS, *Name, SourceRange(TagLoc, NameLoc));
+ if (T.isNull())
+ return true;
+
+ TagDecl::TagKind TagKind = TagDecl::getTagKindForTypeSpec(TagSpec);
+ QualType ElabType = Context.getElaboratedType(T, TagKind);
+
+ return ElabType.getAsOpaquePtr();
+}
+
+Sema::TypeResult
+Sema::ActOnTypenameType(SourceLocation TypenameLoc, const CXXScopeSpec &SS,
+ const IdentifierInfo &II, SourceLocation IdLoc) {
+ NestedNameSpecifier *NNS
+ = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
+ if (!NNS)
+ return true;
+
+ QualType T = CheckTypenameType(NNS, II, SourceRange(TypenameLoc, IdLoc));
+ if (T.isNull())
+ return true;
+ return T.getAsOpaquePtr();
+}
+
+Sema::TypeResult
+Sema::ActOnTypenameType(SourceLocation TypenameLoc, const CXXScopeSpec &SS,
+ SourceLocation TemplateLoc, TypeTy *Ty) {
+ QualType T = GetTypeFromParser(Ty);
+ NestedNameSpecifier *NNS
+ = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
+ const TemplateSpecializationType *TemplateId
+ = T->getAs<TemplateSpecializationType>();
+ assert(TemplateId && "Expected a template specialization type");
+
+ if (computeDeclContext(SS, false)) {
+ // If we can compute a declaration context, then the "typename"
+ // keyword was superfluous. Just build a QualifiedNameType to keep
+ // track of the nested-name-specifier.
+
+ // FIXME: Note that the QualifiedNameType had the "typename" keyword!
+ return Context.getQualifiedNameType(NNS, T).getAsOpaquePtr();
+ }
+
+ return Context.getTypenameType(NNS, TemplateId).getAsOpaquePtr();
+}
+
+/// \brief Build the type that describes a C++ typename specifier,
+/// e.g., "typename T::type".
+QualType
+Sema::CheckTypenameType(NestedNameSpecifier *NNS, const IdentifierInfo &II,
+ SourceRange Range) {
+ CXXRecordDecl *CurrentInstantiation = 0;
+ if (NNS->isDependent()) {
+ CurrentInstantiation = getCurrentInstantiationOf(NNS);
+
+ // If the nested-name-specifier does not refer to the current
+ // instantiation, then build a typename type.
+ if (!CurrentInstantiation)
+ return Context.getTypenameType(NNS, &II);
+
+ // The nested-name-specifier refers to the current instantiation, so the
+ // "typename" keyword itself is superfluous. In C++03, the program is
+ // actually ill-formed. However, DR 382 (in C++0x CD1) allows such
+ // extraneous "typename" keywords, and we retroactively apply this DR to
+ // C++03 code.
+ }
+
+ DeclContext *Ctx = 0;
+
+ if (CurrentInstantiation)
+ Ctx = CurrentInstantiation;
+ else {
+ CXXScopeSpec SS;
+ SS.setScopeRep(NNS);
+ SS.setRange(Range);
+ if (RequireCompleteDeclContext(SS))
+ return QualType();
+
+ Ctx = computeDeclContext(SS);
+ }
+ assert(Ctx && "No declaration context?");
+
+ DeclarationName Name(&II);
+ LookupResult Result(*this, Name, Range.getEnd(), LookupOrdinaryName);
+ LookupQualifiedName(Result, Ctx);
+ unsigned DiagID = 0;
+ Decl *Referenced = 0;
+ switch (Result.getResultKind()) {
+ case LookupResult::NotFound:
+ DiagID = diag::err_typename_nested_not_found;
+ break;
+
+ case LookupResult::NotFoundInCurrentInstantiation:
+ // Okay, it's a member of an unknown instantiation.
+ return Context.getTypenameType(NNS, &II);
+
+ case LookupResult::Found:
+ if (TypeDecl *Type = dyn_cast<TypeDecl>(Result.getFoundDecl())) {
+ // We found a type. Build a QualifiedNameType, since the
+ // typename-specifier was just sugar. FIXME: Tell
+ // QualifiedNameType that it has a "typename" prefix.
+ return Context.getQualifiedNameType(NNS, Context.getTypeDeclType(Type));
+ }
+
+ DiagID = diag::err_typename_nested_not_type;
+ Referenced = Result.getFoundDecl();
+ break;
+
+ case LookupResult::FoundUnresolvedValue:
+ llvm_unreachable("unresolved using decl in non-dependent context");
+ return QualType();
+
+ case LookupResult::FoundOverloaded:
+ DiagID = diag::err_typename_nested_not_type;
+ Referenced = *Result.begin();
+ break;
+
+ case LookupResult::Ambiguous:
+ return QualType();
+ }
+
+ // If we get here, it's because name lookup did not find a
+ // type. Emit an appropriate diagnostic and return an error.
+ Diag(Range.getEnd(), DiagID) << Range << Name << Ctx;
+ if (Referenced)
+ Diag(Referenced->getLocation(), diag::note_typename_refers_here)
+ << Name;
+ return QualType();
+}
+
+namespace {
+ // See Sema::RebuildTypeInCurrentInstantiation
+ class CurrentInstantiationRebuilder
+ : public TreeTransform<CurrentInstantiationRebuilder> {
+ SourceLocation Loc;
+ DeclarationName Entity;
+
+ public:
+ CurrentInstantiationRebuilder(Sema &SemaRef,
+ SourceLocation Loc,
+ DeclarationName Entity)
+ : TreeTransform<CurrentInstantiationRebuilder>(SemaRef),
+ Loc(Loc), Entity(Entity) { }
+
+ /// \brief Determine whether the given type \p T has already been
+ /// transformed.
+ ///
+ /// For the purposes of type reconstruction, a type has already been
+ /// transformed if it is NULL or if it is not dependent.
+ bool AlreadyTransformed(QualType T) {
+ return T.isNull() || !T->isDependentType();
+ }
+
+ /// \brief Returns the location of the entity whose type is being
+ /// rebuilt.
+ SourceLocation getBaseLocation() { return Loc; }
+
+ /// \brief Returns the name of the entity whose type is being rebuilt.
+ DeclarationName getBaseEntity() { return Entity; }
+
+ /// \brief Sets the "base" location and entity when that
+ /// information is known based on another transformation.
+ void setBase(SourceLocation Loc, DeclarationName Entity) {
+ this->Loc = Loc;
+ this->Entity = Entity;
+ }
+
+ /// \brief Transforms an expression by returning the expression itself
+ /// (an identity function).
+ ///
+ /// FIXME: This is completely unsafe; we will need to actually clone the
+ /// expressions.
+ Sema::OwningExprResult TransformExpr(Expr *E) {
+ return getSema().Owned(E);
+ }
+
+ /// \brief Transforms a typename type by determining whether the type now
+ /// refers to a member of the current instantiation, and then
+ /// type-checking and building a QualifiedNameType (when possible).
+ QualType TransformTypenameType(TypeLocBuilder &TLB, TypenameTypeLoc TL);
+ };
+}
+
+QualType
+CurrentInstantiationRebuilder::TransformTypenameType(TypeLocBuilder &TLB,
+ TypenameTypeLoc TL) {
+ TypenameType *T = TL.getTypePtr();
+
+ NestedNameSpecifier *NNS
+ = TransformNestedNameSpecifier(T->getQualifier(),
+ /*FIXME:*/SourceRange(getBaseLocation()));
+ if (!NNS)
+ return QualType();
+
+ // If the nested-name-specifier did not change, and we cannot compute the
+ // context corresponding to the nested-name-specifier, then this
+ // typename type will not change; exit early.
+ CXXScopeSpec SS;
+ SS.setRange(SourceRange(getBaseLocation()));
+ SS.setScopeRep(NNS);
+
+ QualType Result;
+ if (NNS == T->getQualifier() && getSema().computeDeclContext(SS) == 0)
+ Result = QualType(T, 0);
+
+ // Rebuild the typename type, which will probably turn into a
+ // QualifiedNameType.
+ else if (const TemplateSpecializationType *TemplateId = T->getTemplateId()) {
+ QualType NewTemplateId
+ = TransformType(QualType(TemplateId, 0));
+ if (NewTemplateId.isNull())
+ return QualType();
+
+ if (NNS == T->getQualifier() &&
+ NewTemplateId == QualType(TemplateId, 0))
+ Result = QualType(T, 0);
+ else
+ Result = getDerived().RebuildTypenameType(NNS, NewTemplateId);
+ } else
+ Result = getDerived().RebuildTypenameType(NNS, T->getIdentifier(),
+ SourceRange(TL.getNameLoc()));
+
+ TypenameTypeLoc NewTL = TLB.push<TypenameTypeLoc>(Result);
+ NewTL.setNameLoc(TL.getNameLoc());
+ return Result;
+}
+
+/// \brief Rebuilds a type within the context of the current instantiation.
+///
+/// The type \p T is part of the type of an out-of-line member definition of
+/// a class template (or class template partial specialization) that was parsed
+/// and constructed before we entered the scope of the class template (or
+/// partial specialization thereof). This routine will rebuild that type now
+/// that we have entered the declarator's scope, which may produce different
+/// canonical types, e.g.,
+///
+/// \code
+/// template<typename T>
+/// struct X {
+/// typedef T* pointer;
+/// pointer data();
+/// };
+///
+/// template<typename T>
+/// typename X<T>::pointer X<T>::data() { ... }
+/// \endcode
+///
+/// Here, the type "typename X<T>::pointer" will be created as a TypenameType,
+/// since we do not know that we can look into X<T> when we parsed the type.
+/// This function will rebuild the type, performing the lookup of "pointer"
+/// in X<T> and returning a QualifiedNameType whose canonical type is the same
+/// as the canonical type of T*, allowing the return types of the out-of-line
+/// definition and the declaration to match.
+QualType Sema::RebuildTypeInCurrentInstantiation(QualType T, SourceLocation Loc,
+ DeclarationName Name) {
+ if (T.isNull() || !T->isDependentType())
+ return T;
+
+ CurrentInstantiationRebuilder Rebuilder(*this, Loc, Name);
+ return Rebuilder.TransformType(T);
+}
+
+/// \brief Produces a formatted string that describes the binding of
+/// template parameters to template arguments.
+std::string
+Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
+ const TemplateArgumentList &Args) {
+ // FIXME: For variadic templates, we'll need to get the structured list.
+ return getTemplateArgumentBindingsText(Params, Args.getFlatArgumentList(),
+ Args.flat_size());
+}
+
+std::string
+Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
+ const TemplateArgument *Args,
+ unsigned NumArgs) {
+ std::string Result;
+
+ if (!Params || Params->size() == 0 || NumArgs == 0)
+ return Result;
+
+ for (unsigned I = 0, N = Params->size(); I != N; ++I) {
+ if (I >= NumArgs)
+ break;
+
+ if (I == 0)
+ Result += "[with ";
+ else
+ Result += ", ";
+
+ if (const IdentifierInfo *Id = Params->getParam(I)->getIdentifier()) {
+ Result += Id->getName();
+ } else {
+ Result += '$';
+ Result += llvm::utostr(I);
+ }
+
+ Result += " = ";
+
+ switch (Args[I].getKind()) {
+ case TemplateArgument::Null:
+ Result += "<no value>";
+ break;
+
+ case TemplateArgument::Type: {
+ std::string TypeStr;
+ Args[I].getAsType().getAsStringInternal(TypeStr,
+ Context.PrintingPolicy);
+ Result += TypeStr;
+ break;
+ }
+
+ case TemplateArgument::Declaration: {
+ bool Unnamed = true;
+ if (NamedDecl *ND = dyn_cast_or_null<NamedDecl>(Args[I].getAsDecl())) {
+ if (ND->getDeclName()) {
+ Unnamed = false;
+ Result += ND->getNameAsString();
+ }
+ }
+
+ if (Unnamed) {
+ Result += "<anonymous>";
+ }
+ break;
+ }
+
+ case TemplateArgument::Template: {
+ std::string Str;
+ llvm::raw_string_ostream OS(Str);
+ Args[I].getAsTemplate().print(OS, Context.PrintingPolicy);
+ Result += OS.str();
+ break;
+ }
+
+ case TemplateArgument::Integral: {
+ Result += Args[I].getAsIntegral()->toString(10);
+ break;
+ }
+
+ case TemplateArgument::Expression: {
+ assert(false && "No expressions in deduced template arguments!");
+ Result += "<expression>";
+ break;
+ }
+
+ case TemplateArgument::Pack:
+ // FIXME: Format template argument packs
+ Result += "<template argument pack>";
+ break;
+ }
+ }
+
+ Result += ']';
+ return Result;
+}