forked from OSchip/llvm-project
1158 lines
43 KiB
C++
1158 lines
43 KiB
C++
//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===/
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//
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// This file implements C++ template instantiation for declarations.
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//
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//===----------------------------------------------------------------------===/
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#include "Sema.h"
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#include "clang/AST/ASTConsumer.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclTemplate.h"
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#include "clang/AST/DeclVisitor.h"
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#include "clang/AST/Expr.h"
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#include "llvm/Support/Compiler.h"
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using namespace clang;
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namespace {
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class VISIBILITY_HIDDEN TemplateDeclInstantiator
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: public DeclVisitor<TemplateDeclInstantiator, Decl *> {
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Sema &SemaRef;
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DeclContext *Owner;
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const TemplateArgumentList &TemplateArgs;
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public:
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typedef Sema::OwningExprResult OwningExprResult;
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TemplateDeclInstantiator(Sema &SemaRef, DeclContext *Owner,
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const TemplateArgumentList &TemplateArgs)
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: SemaRef(SemaRef), Owner(Owner), TemplateArgs(TemplateArgs) { }
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// FIXME: Once we get closer to completion, replace these manually-written
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// declarations with automatically-generated ones from
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// clang/AST/DeclNodes.def.
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Decl *VisitTranslationUnitDecl(TranslationUnitDecl *D);
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Decl *VisitNamespaceDecl(NamespaceDecl *D);
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Decl *VisitTypedefDecl(TypedefDecl *D);
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Decl *VisitVarDecl(VarDecl *D);
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Decl *VisitFieldDecl(FieldDecl *D);
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Decl *VisitStaticAssertDecl(StaticAssertDecl *D);
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Decl *VisitEnumDecl(EnumDecl *D);
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Decl *VisitEnumConstantDecl(EnumConstantDecl *D);
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Decl *VisitFriendClassDecl(FriendClassDecl *D);
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Decl *VisitFunctionDecl(FunctionDecl *D);
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Decl *VisitCXXRecordDecl(CXXRecordDecl *D);
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Decl *VisitCXXMethodDecl(CXXMethodDecl *D);
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Decl *VisitCXXConstructorDecl(CXXConstructorDecl *D);
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Decl *VisitCXXDestructorDecl(CXXDestructorDecl *D);
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Decl *VisitCXXConversionDecl(CXXConversionDecl *D);
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ParmVarDecl *VisitParmVarDecl(ParmVarDecl *D);
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Decl *VisitOriginalParmVarDecl(OriginalParmVarDecl *D);
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Decl *VisitClassTemplateDecl(ClassTemplateDecl *D);
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Decl *VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
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// Base case. FIXME: Remove once we can instantiate everything.
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Decl *VisitDecl(Decl *) {
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assert(false && "Template instantiation of unknown declaration kind!");
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return 0;
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}
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const LangOptions &getLangOptions() {
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return SemaRef.getLangOptions();
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}
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// Helper functions for instantiating methods.
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QualType InstantiateFunctionType(FunctionDecl *D,
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llvm::SmallVectorImpl<ParmVarDecl *> &Params);
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bool InitFunctionInstantiation(FunctionDecl *New, FunctionDecl *Tmpl);
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bool InitMethodInstantiation(CXXMethodDecl *New, CXXMethodDecl *Tmpl);
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TemplateParameterList *
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InstantiateTemplateParams(TemplateParameterList *List);
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};
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}
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Decl *
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TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
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assert(false && "Translation units cannot be instantiated");
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return D;
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}
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Decl *
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TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) {
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assert(false && "Namespaces cannot be instantiated");
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return D;
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}
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Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) {
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bool Invalid = false;
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QualType T = D->getUnderlyingType();
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if (T->isDependentType()) {
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T = SemaRef.InstantiateType(T, TemplateArgs,
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D->getLocation(), D->getDeclName());
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if (T.isNull()) {
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Invalid = true;
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T = SemaRef.Context.IntTy;
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}
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}
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// Create the new typedef
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TypedefDecl *Typedef
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= TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(),
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D->getIdentifier(), T);
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if (Invalid)
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Typedef->setInvalidDecl();
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Owner->addDecl(Typedef);
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return Typedef;
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}
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Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
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// Instantiate the type of the declaration
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QualType T = SemaRef.InstantiateType(D->getType(), TemplateArgs,
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D->getTypeSpecStartLoc(),
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D->getDeclName());
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if (T.isNull())
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return 0;
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// Build the instantiated declaration
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VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner,
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D->getLocation(), D->getIdentifier(),
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T, D->getDeclaratorInfo(),
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D->getStorageClass());
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Var->setThreadSpecified(D->isThreadSpecified());
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Var->setCXXDirectInitializer(D->hasCXXDirectInitializer());
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Var->setDeclaredInCondition(D->isDeclaredInCondition());
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// If we are instantiating a static data member defined
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// out-of-line, the instantiation will have the same lexical
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// context (which will be a namespace scope) as the template.
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if (D->isOutOfLine())
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Var->setLexicalDeclContext(D->getLexicalDeclContext());
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// FIXME: In theory, we could have a previous declaration for variables that
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// are not static data members.
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bool Redeclaration = false;
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SemaRef.CheckVariableDeclaration(Var, 0, Redeclaration);
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if (D->isOutOfLine()) {
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D->getLexicalDeclContext()->addDecl(Var);
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Owner->makeDeclVisibleInContext(Var);
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} else {
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Owner->addDecl(Var);
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}
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if (D->getInit()) {
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OwningExprResult Init
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= SemaRef.InstantiateExpr(D->getInit(), TemplateArgs);
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if (Init.isInvalid())
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Var->setInvalidDecl();
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else
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SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init),
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D->hasCXXDirectInitializer());
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} else if (!Var->isStaticDataMember() || Var->isOutOfLine())
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SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);
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// Link instantiations of static data members back to the template from
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// which they were instantiated.
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if (Var->isStaticDataMember())
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SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D);
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return Var;
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}
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Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) {
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bool Invalid = false;
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QualType T = D->getType();
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if (T->isDependentType()) {
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T = SemaRef.InstantiateType(T, TemplateArgs,
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D->getLocation(), D->getDeclName());
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if (!T.isNull() && T->isFunctionType()) {
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// C++ [temp.arg.type]p3:
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// If a declaration acquires a function type through a type
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// dependent on a template-parameter and this causes a
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// declaration that does not use the syntactic form of a
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// function declarator to have function type, the program is
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// ill-formed.
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SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function)
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<< T;
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T = QualType();
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Invalid = true;
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}
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}
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Expr *BitWidth = D->getBitWidth();
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if (Invalid)
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BitWidth = 0;
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else if (BitWidth) {
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// The bit-width expression is not potentially evaluated.
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EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated);
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OwningExprResult InstantiatedBitWidth
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= SemaRef.InstantiateExpr(BitWidth, TemplateArgs);
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if (InstantiatedBitWidth.isInvalid()) {
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Invalid = true;
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BitWidth = 0;
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} else
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BitWidth = InstantiatedBitWidth.takeAs<Expr>();
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}
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FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), T,
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D->getDeclaratorInfo(),
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cast<RecordDecl>(Owner),
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D->getLocation(),
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D->isMutable(),
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BitWidth,
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D->getTypeSpecStartLoc(),
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D->getAccess(),
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0);
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if (Field) {
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if (Invalid)
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Field->setInvalidDecl();
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Owner->addDecl(Field);
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}
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return Field;
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}
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Decl *TemplateDeclInstantiator::VisitFriendClassDecl(FriendClassDecl *D) {
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QualType T = D->getFriendType();
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if (T->isDependentType()) {
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T = SemaRef.InstantiateType(T, TemplateArgs, D->getLocation(),
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DeclarationName());
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assert(T.isNull() || getLangOptions().CPlusPlus0x || T->isRecordType());
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}
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// FIXME: the target context might be dependent.
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DeclContext *DC = D->getDeclContext();
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assert(DC->isFileContext());
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FriendClassDecl *NewD =
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FriendClassDecl::Create(SemaRef.Context, DC, D->getLocation(), T,
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D->getFriendLoc());
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Owner->addDecl(NewD);
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return NewD;
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}
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Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) {
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Expr *AssertExpr = D->getAssertExpr();
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// The expression in a static assertion is not potentially evaluated.
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EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated);
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OwningExprResult InstantiatedAssertExpr
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= SemaRef.InstantiateExpr(AssertExpr, TemplateArgs);
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if (InstantiatedAssertExpr.isInvalid())
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return 0;
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OwningExprResult Message(SemaRef, D->getMessage());
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D->getMessage()->Retain();
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Decl *StaticAssert
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= SemaRef.ActOnStaticAssertDeclaration(D->getLocation(),
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move(InstantiatedAssertExpr),
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move(Message)).getAs<Decl>();
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return StaticAssert;
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}
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Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) {
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EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner,
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D->getLocation(), D->getIdentifier(),
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D->getTagKeywordLoc(),
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/*PrevDecl=*/0);
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Enum->setInstantiationOfMemberEnum(D);
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Enum->setAccess(D->getAccess());
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Owner->addDecl(Enum);
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Enum->startDefinition();
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llvm::SmallVector<Sema::DeclPtrTy, 4> Enumerators;
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EnumConstantDecl *LastEnumConst = 0;
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for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(),
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ECEnd = D->enumerator_end();
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EC != ECEnd; ++EC) {
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// The specified value for the enumerator.
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OwningExprResult Value = SemaRef.Owned((Expr *)0);
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if (Expr *UninstValue = EC->getInitExpr()) {
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// The enumerator's value expression is not potentially evaluated.
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EnterExpressionEvaluationContext Unevaluated(SemaRef,
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Action::Unevaluated);
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Value = SemaRef.InstantiateExpr(UninstValue, TemplateArgs);
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}
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// Drop the initial value and continue.
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bool isInvalid = false;
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if (Value.isInvalid()) {
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Value = SemaRef.Owned((Expr *)0);
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isInvalid = true;
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}
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EnumConstantDecl *EnumConst
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= SemaRef.CheckEnumConstant(Enum, LastEnumConst,
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EC->getLocation(), EC->getIdentifier(),
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move(Value));
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if (isInvalid) {
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if (EnumConst)
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EnumConst->setInvalidDecl();
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Enum->setInvalidDecl();
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}
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if (EnumConst) {
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Enum->addDecl(EnumConst);
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Enumerators.push_back(Sema::DeclPtrTy::make(EnumConst));
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LastEnumConst = EnumConst;
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}
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}
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// FIXME: Fixup LBraceLoc and RBraceLoc
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// FIXME: Empty Scope and AttributeList (required to handle attribute packed).
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SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(),
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Sema::DeclPtrTy::make(Enum),
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&Enumerators[0], Enumerators.size(),
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0, 0);
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return Enum;
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}
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Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) {
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assert(false && "EnumConstantDecls can only occur within EnumDecls.");
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return 0;
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}
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Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) {
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TemplateParameterList *TempParams = D->getTemplateParameters();
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TemplateParameterList *InstParams = InstantiateTemplateParams(TempParams);
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if (!InstParams) return NULL;
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CXXRecordDecl *Pattern = D->getTemplatedDecl();
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CXXRecordDecl *RecordInst
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= CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), Owner,
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Pattern->getLocation(), Pattern->getIdentifier(),
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Pattern->getTagKeywordLoc(), /*PrevDecl=*/ NULL);
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ClassTemplateDecl *Inst
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= ClassTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(),
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D->getIdentifier(), InstParams, RecordInst, 0);
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RecordInst->setDescribedClassTemplate(Inst);
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Inst->setAccess(D->getAccess());
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Inst->setInstantiatedFromMemberTemplate(D);
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Owner->addDecl(Inst);
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return Inst;
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}
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Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) {
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CXXRecordDecl *PrevDecl = 0;
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if (D->isInjectedClassName())
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PrevDecl = cast<CXXRecordDecl>(Owner);
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CXXRecordDecl *Record
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= CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner,
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D->getLocation(), D->getIdentifier(),
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D->getTagKeywordLoc(), PrevDecl);
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Record->setImplicit(D->isImplicit());
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Record->setAccess(D->getAccess());
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if (!D->isInjectedClassName())
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Record->setInstantiationOfMemberClass(D);
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Owner->addDecl(Record);
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return Record;
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}
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Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D) {
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// Check whether there is already a function template specialization for
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// this declaration.
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FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
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void *InsertPos = 0;
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if (FunctionTemplate) {
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llvm::FoldingSetNodeID ID;
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FunctionTemplateSpecializationInfo::Profile(ID,
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TemplateArgs.getFlatArgumentList(),
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TemplateArgs.flat_size(),
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SemaRef.Context);
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FunctionTemplateSpecializationInfo *Info
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= FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID,
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InsertPos);
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// If we already have a function template specialization, return it.
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if (Info)
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return Info->Function;
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}
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Sema::LocalInstantiationScope Scope(SemaRef);
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llvm::SmallVector<ParmVarDecl *, 4> Params;
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QualType T = InstantiateFunctionType(D, Params);
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if (T.isNull())
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return 0;
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// Build the instantiated method declaration.
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FunctionDecl *Function;
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if (FriendFunctionDecl* FFD = dyn_cast<FriendFunctionDecl>(D)) {
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// The new decl's semantic context. FIXME: this might need
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// to be instantiated.
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DeclContext *DC = D->getDeclContext();
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// This assert is bogus and exists only to catch cases we don't
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// handle yet.
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assert(!DC->isDependentContext());
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Function =
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FriendFunctionDecl::Create(SemaRef.Context, DC, D->getLocation(),
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D->getDeclName(), T, D->getDeclaratorInfo(),
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D->isInline(), FFD->getFriendLoc());
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Function->setLexicalDeclContext(Owner);
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} else {
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Function =
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FunctionDecl::Create(SemaRef.Context, Owner, D->getLocation(),
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D->getDeclName(), T, D->getDeclaratorInfo(),
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D->getStorageClass(),
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D->isInline(), D->hasWrittenPrototype());
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}
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// Attach the parameters
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for (unsigned P = 0; P < Params.size(); ++P)
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Params[P]->setOwningFunction(Function);
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Function->setParams(SemaRef.Context, Params.data(), Params.size());
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if (InitFunctionInstantiation(Function, D))
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Function->setInvalidDecl();
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bool Redeclaration = false;
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bool OverloadableAttrRequired = false;
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NamedDecl *PrevDecl = 0;
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SemaRef.CheckFunctionDeclaration(Function, PrevDecl, Redeclaration,
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/*FIXME:*/OverloadableAttrRequired);
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if (FunctionTemplate) {
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// Record this function template specialization.
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Function->setFunctionTemplateSpecialization(SemaRef.Context,
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FunctionTemplate,
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&TemplateArgs,
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InsertPos);
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}
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// If this was a friend function decl, it's a member which
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// needs to be added.
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if (isa<FriendFunctionDecl>(Function)) {
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// If the new context is still dependent, this declaration
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// needs to remain hidden.
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if (Owner->isDependentContext())
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Owner->addHiddenDecl(Function);
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else
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Owner->addDecl(Function);
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}
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return Function;
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}
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Decl *TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D) {
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// Check whether there is already a function template specialization for
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// this declaration.
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FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
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void *InsertPos = 0;
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if (FunctionTemplate) {
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llvm::FoldingSetNodeID ID;
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FunctionTemplateSpecializationInfo::Profile(ID,
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TemplateArgs.getFlatArgumentList(),
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TemplateArgs.flat_size(),
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SemaRef.Context);
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FunctionTemplateSpecializationInfo *Info
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= FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID,
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InsertPos);
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// If we already have a function template specialization, return it.
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if (Info)
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return Info->Function;
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}
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Sema::LocalInstantiationScope Scope(SemaRef);
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llvm::SmallVector<ParmVarDecl *, 4> Params;
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QualType T = InstantiateFunctionType(D, Params);
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if (T.isNull())
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return 0;
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// Build the instantiated method declaration.
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CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner);
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CXXMethodDecl *Method = 0;
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DeclarationName Name = D->getDeclName();
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if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
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QualType ClassTy = SemaRef.Context.getTypeDeclType(Record);
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Name = SemaRef.Context.DeclarationNames.getCXXConstructorName(
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SemaRef.Context.getCanonicalType(ClassTy));
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Method = CXXConstructorDecl::Create(SemaRef.Context, Record,
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Constructor->getLocation(),
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Name, T,
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Constructor->getDeclaratorInfo(),
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Constructor->isExplicit(),
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Constructor->isInline(), false);
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} else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
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QualType ClassTy = SemaRef.Context.getTypeDeclType(Record);
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Name = SemaRef.Context.DeclarationNames.getCXXDestructorName(
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SemaRef.Context.getCanonicalType(ClassTy));
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Method = CXXDestructorDecl::Create(SemaRef.Context, Record,
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Destructor->getLocation(), Name,
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T, Destructor->isInline(), false);
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} else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) {
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CanQualType ConvTy
|
|
= SemaRef.Context.getCanonicalType(
|
|
T->getAsFunctionType()->getResultType());
|
|
Name = SemaRef.Context.DeclarationNames.getCXXConversionFunctionName(
|
|
ConvTy);
|
|
Method = CXXConversionDecl::Create(SemaRef.Context, Record,
|
|
Conversion->getLocation(), Name,
|
|
T, Conversion->getDeclaratorInfo(),
|
|
Conversion->isInline(),
|
|
Conversion->isExplicit());
|
|
} else {
|
|
Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(),
|
|
D->getDeclName(), T, D->getDeclaratorInfo(),
|
|
D->isStatic(), D->isInline());
|
|
}
|
|
|
|
if (!FunctionTemplate)
|
|
Method->setInstantiationOfMemberFunction(D);
|
|
|
|
// If we are instantiating a member function defined
|
|
// out-of-line, the instantiation will have the same lexical
|
|
// context (which will be a namespace scope) as the template.
|
|
if (D->isOutOfLine())
|
|
Method->setLexicalDeclContext(D->getLexicalDeclContext());
|
|
|
|
// Attach the parameters
|
|
for (unsigned P = 0; P < Params.size(); ++P)
|
|
Params[P]->setOwningFunction(Method);
|
|
Method->setParams(SemaRef.Context, Params.data(), Params.size());
|
|
|
|
if (InitMethodInstantiation(Method, D))
|
|
Method->setInvalidDecl();
|
|
|
|
NamedDecl *PrevDecl = 0;
|
|
|
|
if (!FunctionTemplate) {
|
|
PrevDecl = SemaRef.LookupQualifiedName(Owner, Name,
|
|
Sema::LookupOrdinaryName, true);
|
|
|
|
// In C++, the previous declaration we find might be a tag type
|
|
// (class or enum). In this case, the new declaration will hide the
|
|
// tag type. Note that this does does not apply if we're declaring a
|
|
// typedef (C++ [dcl.typedef]p4).
|
|
if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag)
|
|
PrevDecl = 0;
|
|
}
|
|
|
|
if (FunctionTemplate)
|
|
// Record this function template specialization.
|
|
Method->setFunctionTemplateSpecialization(SemaRef.Context,
|
|
FunctionTemplate,
|
|
&TemplateArgs,
|
|
InsertPos);
|
|
|
|
bool Redeclaration = false;
|
|
bool OverloadableAttrRequired = false;
|
|
SemaRef.CheckFunctionDeclaration(Method, PrevDecl, Redeclaration,
|
|
/*FIXME:*/OverloadableAttrRequired);
|
|
|
|
if (!FunctionTemplate && (!Method->isInvalidDecl() || !PrevDecl))
|
|
Owner->addDecl(Method);
|
|
|
|
return Method;
|
|
}
|
|
|
|
Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
|
|
return VisitCXXMethodDecl(D);
|
|
}
|
|
|
|
Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
|
|
return VisitCXXMethodDecl(D);
|
|
}
|
|
|
|
Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) {
|
|
return VisitCXXMethodDecl(D);
|
|
}
|
|
|
|
ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) {
|
|
QualType OrigT = SemaRef.InstantiateType(D->getOriginalType(), TemplateArgs,
|
|
D->getLocation(), D->getDeclName());
|
|
if (OrigT.isNull())
|
|
return 0;
|
|
|
|
QualType T = SemaRef.adjustParameterType(OrigT);
|
|
|
|
// Allocate the parameter
|
|
ParmVarDecl *Param = 0;
|
|
if (T == OrigT)
|
|
Param = ParmVarDecl::Create(SemaRef.Context, Owner, D->getLocation(),
|
|
D->getIdentifier(), T, D->getDeclaratorInfo(),
|
|
D->getStorageClass(), 0);
|
|
else
|
|
Param = OriginalParmVarDecl::Create(SemaRef.Context, Owner,
|
|
D->getLocation(), D->getIdentifier(),
|
|
T, D->getDeclaratorInfo(), OrigT,
|
|
D->getStorageClass(), 0);
|
|
|
|
// Mark the default argument as being uninstantiated.
|
|
if (Expr *Arg = D->getDefaultArg())
|
|
Param->setUninstantiatedDefaultArg(Arg);
|
|
|
|
// Note: we don't try to instantiate function parameters until after
|
|
// we've instantiated the function's type. Therefore, we don't have
|
|
// to check for 'void' parameter types here.
|
|
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
|
|
return Param;
|
|
}
|
|
|
|
Decl *
|
|
TemplateDeclInstantiator::VisitOriginalParmVarDecl(OriginalParmVarDecl *D) {
|
|
// Since parameter types can decay either before or after
|
|
// instantiation, we simply treat OriginalParmVarDecls as
|
|
// ParmVarDecls the same way, and create one or the other depending
|
|
// on what happens after template instantiation.
|
|
return VisitParmVarDecl(D);
|
|
}
|
|
|
|
Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl(
|
|
TemplateTypeParmDecl *D) {
|
|
// TODO: don't always clone when decls are refcounted.
|
|
const Type* T = D->getTypeForDecl();
|
|
assert(T->isTemplateTypeParmType());
|
|
const TemplateTypeParmType *TTPT = T->getAs<TemplateTypeParmType>();
|
|
|
|
TemplateTypeParmDecl *Inst =
|
|
TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
|
|
TTPT->getDepth(), TTPT->getIndex(),
|
|
TTPT->getName(),
|
|
D->wasDeclaredWithTypename(),
|
|
D->isParameterPack());
|
|
|
|
if (D->hasDefaultArgument()) {
|
|
QualType DefaultPattern = D->getDefaultArgument();
|
|
QualType DefaultInst
|
|
= SemaRef.InstantiateType(DefaultPattern, TemplateArgs,
|
|
D->getDefaultArgumentLoc(),
|
|
D->getDeclName());
|
|
|
|
Inst->setDefaultArgument(DefaultInst,
|
|
D->getDefaultArgumentLoc(),
|
|
D->defaultArgumentWasInherited() /* preserve? */);
|
|
}
|
|
|
|
return Inst;
|
|
}
|
|
|
|
Decl *Sema::InstantiateDecl(Decl *D, DeclContext *Owner,
|
|
const TemplateArgumentList &TemplateArgs) {
|
|
TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs);
|
|
return Instantiator.Visit(D);
|
|
}
|
|
|
|
/// \brief Instantiates a nested template parameter list in the current
|
|
/// instantiation context.
|
|
///
|
|
/// \param L The parameter list to instantiate
|
|
///
|
|
/// \returns NULL if there was an error
|
|
TemplateParameterList *
|
|
TemplateDeclInstantiator::InstantiateTemplateParams(TemplateParameterList *L) {
|
|
// Get errors for all the parameters before bailing out.
|
|
bool Invalid = false;
|
|
|
|
unsigned N = L->size();
|
|
typedef llvm::SmallVector<Decl*,8> ParamVector;
|
|
ParamVector Params;
|
|
Params.reserve(N);
|
|
for (TemplateParameterList::iterator PI = L->begin(), PE = L->end();
|
|
PI != PE; ++PI) {
|
|
Decl *D = Visit(*PI);
|
|
Params.push_back(D);
|
|
Invalid = Invalid || !D;
|
|
}
|
|
|
|
// Clean up if we had an error.
|
|
if (Invalid) {
|
|
for (ParamVector::iterator PI = Params.begin(), PE = Params.end();
|
|
PI != PE; ++PI)
|
|
if (*PI)
|
|
(*PI)->Destroy(SemaRef.Context);
|
|
return NULL;
|
|
}
|
|
|
|
TemplateParameterList *InstL
|
|
= TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(),
|
|
L->getLAngleLoc(), &Params.front(), N,
|
|
L->getRAngleLoc());
|
|
return InstL;
|
|
}
|
|
|
|
/// \brief Instantiates the type of the given function, including
|
|
/// instantiating all of the function parameters.
|
|
///
|
|
/// \param D The function that we will be instantiated
|
|
///
|
|
/// \param Params the instantiated parameter declarations
|
|
|
|
/// \returns the instantiated function's type if successfull, a NULL
|
|
/// type if there was an error.
|
|
QualType
|
|
TemplateDeclInstantiator::InstantiateFunctionType(FunctionDecl *D,
|
|
llvm::SmallVectorImpl<ParmVarDecl *> &Params) {
|
|
bool InvalidDecl = false;
|
|
|
|
// Instantiate the function parameters
|
|
TemplateDeclInstantiator ParamInstantiator(SemaRef, 0, TemplateArgs);
|
|
llvm::SmallVector<QualType, 4> ParamTys;
|
|
for (FunctionDecl::param_iterator P = D->param_begin(),
|
|
PEnd = D->param_end();
|
|
P != PEnd; ++P) {
|
|
if (ParmVarDecl *PInst = ParamInstantiator.VisitParmVarDecl(*P)) {
|
|
if (PInst->getType()->isVoidType()) {
|
|
SemaRef.Diag(PInst->getLocation(), diag::err_param_with_void_type);
|
|
PInst->setInvalidDecl();
|
|
} else if (SemaRef.RequireNonAbstractType(PInst->getLocation(),
|
|
PInst->getType(),
|
|
diag::err_abstract_type_in_decl,
|
|
Sema::AbstractParamType))
|
|
PInst->setInvalidDecl();
|
|
|
|
Params.push_back(PInst);
|
|
ParamTys.push_back(PInst->getType());
|
|
|
|
if (PInst->isInvalidDecl())
|
|
InvalidDecl = true;
|
|
} else
|
|
InvalidDecl = true;
|
|
}
|
|
|
|
// FIXME: Deallocate dead declarations.
|
|
if (InvalidDecl)
|
|
return QualType();
|
|
|
|
const FunctionProtoType *Proto = D->getType()->getAsFunctionProtoType();
|
|
assert(Proto && "Missing prototype?");
|
|
QualType ResultType
|
|
= SemaRef.InstantiateType(Proto->getResultType(), TemplateArgs,
|
|
D->getLocation(), D->getDeclName());
|
|
if (ResultType.isNull())
|
|
return QualType();
|
|
|
|
return SemaRef.BuildFunctionType(ResultType, ParamTys.data(), ParamTys.size(),
|
|
Proto->isVariadic(), Proto->getTypeQuals(),
|
|
D->getLocation(), D->getDeclName());
|
|
}
|
|
|
|
/// \brief Initializes the common fields of an instantiation function
|
|
/// declaration (New) from the corresponding fields of its template (Tmpl).
|
|
///
|
|
/// \returns true if there was an error
|
|
bool
|
|
TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New,
|
|
FunctionDecl *Tmpl) {
|
|
if (Tmpl->isDeleted())
|
|
New->setDeleted();
|
|
|
|
// If we are performing substituting explicitly-specified template arguments
|
|
// or deduced template arguments into a function template and we reach this
|
|
// point, we are now past the point where SFINAE applies and have committed
|
|
// to keeping the new function template specialization. We therefore
|
|
// convert the active template instantiation for the function template
|
|
// into a template instantiation for this specific function template
|
|
// specialization, which is not a SFINAE context, so that we diagnose any
|
|
// further errors in the declaration itself.
|
|
typedef Sema::ActiveTemplateInstantiation ActiveInstType;
|
|
ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back();
|
|
if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution ||
|
|
ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) {
|
|
if (FunctionTemplateDecl *FunTmpl
|
|
= dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) {
|
|
assert(FunTmpl->getTemplatedDecl() == Tmpl &&
|
|
"Deduction from the wrong function template?");
|
|
(void) FunTmpl;
|
|
ActiveInst.Kind = ActiveInstType::TemplateInstantiation;
|
|
ActiveInst.Entity = reinterpret_cast<uintptr_t>(New);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// \brief Initializes common fields of an instantiated method
|
|
/// declaration (New) from the corresponding fields of its template
|
|
/// (Tmpl).
|
|
///
|
|
/// \returns true if there was an error
|
|
bool
|
|
TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New,
|
|
CXXMethodDecl *Tmpl) {
|
|
if (InitFunctionInstantiation(New, Tmpl))
|
|
return true;
|
|
|
|
CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner);
|
|
New->setAccess(Tmpl->getAccess());
|
|
if (Tmpl->isVirtualAsWritten()) {
|
|
New->setVirtualAsWritten(true);
|
|
Record->setAggregate(false);
|
|
Record->setPOD(false);
|
|
Record->setEmpty(false);
|
|
Record->setPolymorphic(true);
|
|
}
|
|
if (Tmpl->isPure()) {
|
|
New->setPure();
|
|
Record->setAbstract(true);
|
|
}
|
|
|
|
// FIXME: attributes
|
|
// FIXME: New needs a pointer to Tmpl
|
|
return false;
|
|
}
|
|
|
|
/// \brief Instantiate the definition of the given function from its
|
|
/// template.
|
|
///
|
|
/// \param PointOfInstantiation the point at which the instantiation was
|
|
/// required. Note that this is not precisely a "point of instantiation"
|
|
/// for the function, but it's close.
|
|
///
|
|
/// \param Function the already-instantiated declaration of a
|
|
/// function template specialization or member function of a class template
|
|
/// specialization.
|
|
///
|
|
/// \param Recursive if true, recursively instantiates any functions that
|
|
/// are required by this instantiation.
|
|
void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
|
|
FunctionDecl *Function,
|
|
bool Recursive) {
|
|
if (Function->isInvalidDecl())
|
|
return;
|
|
|
|
assert(!Function->getBody() && "Already instantiated!");
|
|
|
|
// Find the function body that we'll be substituting.
|
|
const FunctionDecl *PatternDecl = 0;
|
|
if (FunctionTemplateDecl *Primary = Function->getPrimaryTemplate())
|
|
PatternDecl = Primary->getTemplatedDecl();
|
|
else
|
|
PatternDecl = Function->getInstantiatedFromMemberFunction();
|
|
Stmt *Pattern = 0;
|
|
if (PatternDecl)
|
|
Pattern = PatternDecl->getBody(PatternDecl);
|
|
|
|
if (!Pattern)
|
|
return;
|
|
|
|
InstantiatingTemplate Inst(*this, PointOfInstantiation, Function);
|
|
if (Inst)
|
|
return;
|
|
|
|
// If we're performing recursive template instantiation, create our own
|
|
// queue of pending implicit instantiations that we will instantiate later,
|
|
// while we're still within our own instantiation context.
|
|
std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations;
|
|
if (Recursive)
|
|
PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
|
|
|
|
ActOnStartOfFunctionDef(0, DeclPtrTy::make(Function));
|
|
|
|
// Introduce a new scope where local variable instantiations will be
|
|
// recorded.
|
|
LocalInstantiationScope Scope(*this);
|
|
|
|
// Introduce the instantiated function parameters into the local
|
|
// instantiation scope.
|
|
for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I)
|
|
Scope.InstantiatedLocal(PatternDecl->getParamDecl(I),
|
|
Function->getParamDecl(I));
|
|
|
|
// Enter the scope of this instantiation. We don't use
|
|
// PushDeclContext because we don't have a scope.
|
|
DeclContext *PreviousContext = CurContext;
|
|
CurContext = Function;
|
|
|
|
// Instantiate the function body.
|
|
OwningStmtResult Body
|
|
= InstantiateStmt(Pattern, getTemplateInstantiationArgs(Function));
|
|
|
|
ActOnFinishFunctionBody(DeclPtrTy::make(Function), move(Body),
|
|
/*IsInstantiation=*/true);
|
|
|
|
CurContext = PreviousContext;
|
|
|
|
DeclGroupRef DG(Function);
|
|
Consumer.HandleTopLevelDecl(DG);
|
|
|
|
if (Recursive) {
|
|
// Instantiate any pending implicit instantiations found during the
|
|
// instantiation of this template.
|
|
PerformPendingImplicitInstantiations();
|
|
|
|
// Restore the set of pending implicit instantiations.
|
|
PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
|
|
}
|
|
}
|
|
|
|
/// \brief Instantiate the definition of the given variable from its
|
|
/// template.
|
|
///
|
|
/// \param PointOfInstantiation the point at which the instantiation was
|
|
/// required. Note that this is not precisely a "point of instantiation"
|
|
/// for the function, but it's close.
|
|
///
|
|
/// \param Var the already-instantiated declaration of a static member
|
|
/// variable of a class template specialization.
|
|
///
|
|
/// \param Recursive if true, recursively instantiates any functions that
|
|
/// are required by this instantiation.
|
|
void Sema::InstantiateStaticDataMemberDefinition(
|
|
SourceLocation PointOfInstantiation,
|
|
VarDecl *Var,
|
|
bool Recursive) {
|
|
if (Var->isInvalidDecl())
|
|
return;
|
|
|
|
// Find the out-of-line definition of this static data member.
|
|
// FIXME: Do we have to look for specializations separately?
|
|
VarDecl *Def = Var->getInstantiatedFromStaticDataMember();
|
|
bool FoundOutOfLineDef = false;
|
|
assert(Def && "This data member was not instantiated from a template?");
|
|
assert(Def->isStaticDataMember() && "Not a static data member?");
|
|
for (VarDecl::redecl_iterator RD = Def->redecls_begin(),
|
|
RDEnd = Def->redecls_end();
|
|
RD != RDEnd; ++RD) {
|
|
if (RD->getLexicalDeclContext()->isFileContext()) {
|
|
Def = *RD;
|
|
FoundOutOfLineDef = true;
|
|
}
|
|
}
|
|
|
|
if (!FoundOutOfLineDef) {
|
|
// We did not find an out-of-line definition of this static data member,
|
|
// so we won't perform any instantiation. Rather, we rely on the user to
|
|
// instantiate this definition (or provide a specialization for it) in
|
|
// another translation unit.
|
|
return;
|
|
}
|
|
|
|
InstantiatingTemplate Inst(*this, PointOfInstantiation, Var);
|
|
if (Inst)
|
|
return;
|
|
|
|
// If we're performing recursive template instantiation, create our own
|
|
// queue of pending implicit instantiations that we will instantiate later,
|
|
// while we're still within our own instantiation context.
|
|
std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations;
|
|
if (Recursive)
|
|
PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
|
|
|
|
// Enter the scope of this instantiation. We don't use
|
|
// PushDeclContext because we don't have a scope.
|
|
DeclContext *PreviousContext = CurContext;
|
|
CurContext = Var->getDeclContext();
|
|
|
|
#if 0
|
|
// Instantiate the initializer of this static data member.
|
|
OwningExprResult Init
|
|
= InstantiateExpr(Def->getInit(), getTemplateInstantiationArgs(Var));
|
|
if (Init.isInvalid()) {
|
|
// If instantiation of the initializer failed, mark the declaration invalid
|
|
// and don't instantiate anything else that was triggered by this
|
|
// instantiation.
|
|
Var->setInvalidDecl();
|
|
|
|
// Restore the set of pending implicit instantiations.
|
|
PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
|
|
|
|
return;
|
|
}
|
|
|
|
// Type-check the initializer.
|
|
if (Init.get())
|
|
AddInitializerToDecl(DeclPtrTy::make(Var), move(Init),
|
|
Def->hasCXXDirectInitializer());
|
|
else
|
|
ActOnUninitializedDecl(DeclPtrTy::make(Var), false);
|
|
#else
|
|
Var = cast_or_null<VarDecl>(InstantiateDecl(Def, Var->getDeclContext(),
|
|
getTemplateInstantiationArgs(Var)));
|
|
#endif
|
|
|
|
CurContext = PreviousContext;
|
|
|
|
if (Var) {
|
|
DeclGroupRef DG(Var);
|
|
Consumer.HandleTopLevelDecl(DG);
|
|
}
|
|
|
|
if (Recursive) {
|
|
// Instantiate any pending implicit instantiations found during the
|
|
// instantiation of this template.
|
|
PerformPendingImplicitInstantiations();
|
|
|
|
// Restore the set of pending implicit instantiations.
|
|
PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
|
|
}
|
|
}
|
|
|
|
static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) {
|
|
if (D->getKind() != Other->getKind())
|
|
return false;
|
|
|
|
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other))
|
|
return Record->getInstantiatedFromMemberClass()->getCanonicalDecl()
|
|
== D->getCanonicalDecl();
|
|
|
|
if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other))
|
|
return Function->getInstantiatedFromMemberFunction()->getCanonicalDecl()
|
|
== D->getCanonicalDecl();
|
|
|
|
if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other))
|
|
return Enum->getInstantiatedFromMemberEnum()->getCanonicalDecl()
|
|
== D->getCanonicalDecl();
|
|
|
|
if (VarDecl *Var = dyn_cast<VarDecl>(Other))
|
|
if (Var->isStaticDataMember())
|
|
return Var->getInstantiatedFromStaticDataMember()->getCanonicalDecl()
|
|
== D->getCanonicalDecl();
|
|
|
|
// FIXME: How can we find instantiations of anonymous unions?
|
|
|
|
return D->getDeclName() && isa<NamedDecl>(Other) &&
|
|
D->getDeclName() == cast<NamedDecl>(Other)->getDeclName();
|
|
}
|
|
|
|
template<typename ForwardIterator>
|
|
static NamedDecl *findInstantiationOf(ASTContext &Ctx,
|
|
NamedDecl *D,
|
|
ForwardIterator first,
|
|
ForwardIterator last) {
|
|
for (; first != last; ++first)
|
|
if (isInstantiationOf(Ctx, D, *first))
|
|
return cast<NamedDecl>(*first);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/// \brief Find the instantiation of the given declaration within the
|
|
/// current instantiation.
|
|
///
|
|
/// This routine is intended to be used when \p D is a declaration
|
|
/// referenced from within a template, that needs to mapped into the
|
|
/// corresponding declaration within an instantiation. For example,
|
|
/// given:
|
|
///
|
|
/// \code
|
|
/// template<typename T>
|
|
/// struct X {
|
|
/// enum Kind {
|
|
/// KnownValue = sizeof(T)
|
|
/// };
|
|
///
|
|
/// bool getKind() const { return KnownValue; }
|
|
/// };
|
|
///
|
|
/// template struct X<int>;
|
|
/// \endcode
|
|
///
|
|
/// In the instantiation of X<int>::getKind(), we need to map the
|
|
/// EnumConstantDecl for KnownValue (which refers to
|
|
/// X<T>::<Kind>::KnownValue) to its instantiation
|
|
/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs
|
|
/// this mapping from within the instantiation of X<int>.
|
|
NamedDecl * Sema::InstantiateCurrentDeclRef(NamedDecl *D) {
|
|
DeclContext *ParentDC = D->getDeclContext();
|
|
if (isa<ParmVarDecl>(D) || ParentDC->isFunctionOrMethod()) {
|
|
// D is a local of some kind. Look into the map of local
|
|
// declarations to their instantiations.
|
|
return cast<NamedDecl>(CurrentInstantiationScope->getInstantiationOf(D));
|
|
}
|
|
|
|
if (NamedDecl *ParentDecl = dyn_cast<NamedDecl>(ParentDC)) {
|
|
ParentDecl = InstantiateCurrentDeclRef(ParentDecl);
|
|
if (!ParentDecl)
|
|
return 0;
|
|
|
|
ParentDC = cast<DeclContext>(ParentDecl);
|
|
}
|
|
|
|
if (ParentDC != D->getDeclContext()) {
|
|
// We performed some kind of instantiation in the parent context,
|
|
// so now we need to look into the instantiated parent context to
|
|
// find the instantiation of the declaration D.
|
|
NamedDecl *Result = 0;
|
|
if (D->getDeclName()) {
|
|
DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName());
|
|
Result = findInstantiationOf(Context, D, Found.first, Found.second);
|
|
} else {
|
|
// Since we don't have a name for the entity we're looking for,
|
|
// our only option is to walk through all of the declarations to
|
|
// find that name. This will occur in a few cases:
|
|
//
|
|
// - anonymous struct/union within a template
|
|
// - unnamed class/struct/union/enum within a template
|
|
//
|
|
// FIXME: Find a better way to find these instantiations!
|
|
Result = findInstantiationOf(Context, D,
|
|
ParentDC->decls_begin(),
|
|
ParentDC->decls_end());
|
|
}
|
|
assert(Result && "Unable to find instantiation of declaration!");
|
|
D = Result;
|
|
}
|
|
|
|
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D))
|
|
if (ClassTemplateDecl *ClassTemplate
|
|
= Record->getDescribedClassTemplate()) {
|
|
// When the declaration D was parsed, it referred to the current
|
|
// instantiation. Therefore, look through the current context,
|
|
// which contains actual instantiations, to find the
|
|
// instantiation of the "current instantiation" that D refers
|
|
// to. Alternatively, we could just instantiate the
|
|
// injected-class-name with the current template arguments, but
|
|
// such an instantiation is far more expensive.
|
|
for (DeclContext *DC = CurContext; !DC->isFileContext();
|
|
DC = DC->getParent()) {
|
|
if (ClassTemplateSpecializationDecl *Spec
|
|
= dyn_cast<ClassTemplateSpecializationDecl>(DC))
|
|
if (Spec->getSpecializedTemplate()->getCanonicalDecl()
|
|
== ClassTemplate->getCanonicalDecl())
|
|
return Spec;
|
|
}
|
|
|
|
assert(false &&
|
|
"Unable to find declaration for the current instantiation");
|
|
}
|
|
|
|
return D;
|
|
}
|
|
|
|
/// \brief Performs template instantiation for all implicit template
|
|
/// instantiations we have seen until this point.
|
|
void Sema::PerformPendingImplicitInstantiations() {
|
|
while (!PendingImplicitInstantiations.empty()) {
|
|
PendingImplicitInstantiation Inst = PendingImplicitInstantiations.front();
|
|
PendingImplicitInstantiations.pop_front();
|
|
|
|
// Instantiate function definitions
|
|
if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) {
|
|
if (!Function->getBody())
|
|
InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true);
|
|
continue;
|
|
}
|
|
|
|
// Instantiate static data member definitions.
|
|
VarDecl *Var = cast<VarDecl>(Inst.first);
|
|
assert(Var->isStaticDataMember() && "Not a static data member?");
|
|
InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true);
|
|
}
|
|
}
|