forked from OSchip/llvm-project
535 lines
17 KiB
C++
535 lines
17 KiB
C++
//===--- Decl.cpp - Declaration AST Node Implementation -------------------===//
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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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//
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// This file implements the Decl subclasses.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Stmt.h"
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#include "clang/AST/Expr.h"
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#include "clang/Basic/IdentifierTable.h"
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#include <vector>
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using namespace clang;
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void Attr::Destroy(ASTContext &C) {
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if (Next) {
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Next->Destroy(C);
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Next = 0;
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}
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this->~Attr();
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C.Deallocate((void*)this);
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}
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//===----------------------------------------------------------------------===//
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// Decl Allocation/Deallocation Method Implementations
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//===----------------------------------------------------------------------===//
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TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
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return new (C) TranslationUnitDecl();
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}
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NamespaceDecl *NamespaceDecl::Create(ASTContext &C, DeclContext *DC,
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SourceLocation L, IdentifierInfo *Id) {
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return new (C) NamespaceDecl(DC, L, Id);
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}
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void NamespaceDecl::Destroy(ASTContext& C) {
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// NamespaceDecl uses "NextDeclarator" to chain namespace declarations
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// together. They are all top-level Decls.
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this->~NamespaceDecl();
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C.Deallocate((void *)this);
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}
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ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
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SourceLocation L, IdentifierInfo *Id, QualType T) {
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return new (C) ImplicitParamDecl(ImplicitParam, DC, L, Id, T);
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}
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ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
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SourceLocation L, IdentifierInfo *Id,
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QualType T, StorageClass S,
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Expr *DefArg) {
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return new (C) ParmVarDecl(ParmVar, DC, L, Id, T, S, DefArg);
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}
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QualType ParmVarDecl::getOriginalType() const {
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if (const OriginalParmVarDecl *PVD =
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dyn_cast<OriginalParmVarDecl>(this))
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return PVD->OriginalType;
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return getType();
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}
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bool VarDecl::isExternC(ASTContext &Context) const {
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if (!Context.getLangOptions().CPlusPlus)
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return (getDeclContext()->isTranslationUnit() &&
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getStorageClass() != Static) ||
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(getDeclContext()->isFunctionOrMethod() && hasExternalStorage());
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for (const DeclContext *DC = getDeclContext(); !DC->isTranslationUnit();
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DC = DC->getParent()) {
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if (const LinkageSpecDecl *Linkage = dyn_cast<LinkageSpecDecl>(DC)) {
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if (Linkage->getLanguage() == LinkageSpecDecl::lang_c)
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return getStorageClass() != Static;
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break;
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}
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if (DC->isFunctionOrMethod())
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return false;
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}
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return false;
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}
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OriginalParmVarDecl *OriginalParmVarDecl::Create(
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ASTContext &C, DeclContext *DC,
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SourceLocation L, IdentifierInfo *Id,
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QualType T, QualType OT, StorageClass S,
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Expr *DefArg) {
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return new (C) OriginalParmVarDecl(DC, L, Id, T, OT, S, DefArg);
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}
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FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
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SourceLocation L,
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DeclarationName N, QualType T,
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StorageClass S, bool isInline,
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bool hasPrototype,
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SourceLocation TypeSpecStartLoc) {
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FunctionDecl *New
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= new (C) FunctionDecl(Function, DC, L, N, T, S, isInline,
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TypeSpecStartLoc);
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New->HasPrototype = hasPrototype;
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return New;
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}
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BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
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return new (C) BlockDecl(DC, L);
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}
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FieldDecl *FieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
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IdentifierInfo *Id, QualType T, Expr *BW,
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bool Mutable) {
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return new (C) FieldDecl(Decl::Field, DC, L, Id, T, BW, Mutable);
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}
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bool FieldDecl::isAnonymousStructOrUnion() const {
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if (!isImplicit() || getDeclName())
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return false;
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if (const RecordType *Record = getType()->getAsRecordType())
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return Record->getDecl()->isAnonymousStructOrUnion();
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return false;
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}
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EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
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SourceLocation L,
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IdentifierInfo *Id, QualType T,
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Expr *E, const llvm::APSInt &V) {
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return new (C) EnumConstantDecl(CD, L, Id, T, E, V);
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}
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void EnumConstantDecl::Destroy(ASTContext& C) {
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if (Init) Init->Destroy(C);
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Decl::Destroy(C);
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}
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TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
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SourceLocation L,
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IdentifierInfo *Id, QualType T) {
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return new (C) TypedefDecl(DC, L, Id, T);
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}
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EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
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IdentifierInfo *Id,
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EnumDecl *PrevDecl) {
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EnumDecl *Enum = new (C) EnumDecl(DC, L, Id);
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C.getTypeDeclType(Enum, PrevDecl);
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return Enum;
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}
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void EnumDecl::Destroy(ASTContext& C) {
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Decl::Destroy(C);
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}
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void EnumDecl::completeDefinition(ASTContext &C, QualType NewType) {
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assert(!isDefinition() && "Cannot redefine enums!");
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IntegerType = NewType;
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TagDecl::completeDefinition();
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}
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FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
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SourceLocation L,
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StringLiteral *Str) {
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return new (C) FileScopeAsmDecl(DC, L, Str);
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}
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//===----------------------------------------------------------------------===//
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// NamedDecl Implementation
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//===----------------------------------------------------------------------===//
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std::string NamedDecl::getQualifiedNameAsString() const {
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std::vector<std::string> Names;
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std::string QualName;
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const DeclContext *Ctx = getDeclContext();
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if (Ctx->isFunctionOrMethod())
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return getNameAsString();
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while (Ctx) {
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if (Ctx->isFunctionOrMethod())
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// FIXME: That probably will happen, when D was member of local
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// scope class/struct/union. How do we handle this case?
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break;
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if (const NamedDecl *ND = dyn_cast<NamedDecl>(Ctx))
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Names.push_back(ND->getNameAsString());
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else
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break;
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Ctx = Ctx->getParent();
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}
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std::vector<std::string>::reverse_iterator
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I = Names.rbegin(),
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End = Names.rend();
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for (; I!=End; ++I)
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QualName += *I + "::";
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QualName += getNameAsString();
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return QualName;
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}
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bool NamedDecl::declarationReplaces(NamedDecl *OldD) const {
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assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
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// UsingDirectiveDecl's are not really NamedDecl's, and all have same name.
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// We want to keep it, unless it nominates same namespace.
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if (getKind() == Decl::UsingDirective) {
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return cast<UsingDirectiveDecl>(this)->getNominatedNamespace() ==
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cast<UsingDirectiveDecl>(OldD)->getNominatedNamespace();
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}
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if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this))
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// For function declarations, we keep track of redeclarations.
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return FD->getPreviousDeclaration() == OldD;
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// For method declarations, we keep track of redeclarations.
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if (isa<ObjCMethodDecl>(this))
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return false;
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// For non-function declarations, if the declarations are of the
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// same kind then this must be a redeclaration, or semantic analysis
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// would not have given us the new declaration.
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return this->getKind() == OldD->getKind();
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}
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bool NamedDecl::hasLinkage() const {
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if (const VarDecl *VD = dyn_cast<VarDecl>(this))
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return VD->hasExternalStorage() || VD->isFileVarDecl();
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if (isa<FunctionDecl>(this) && !isa<CXXMethodDecl>(this))
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return true;
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return false;
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}
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//===----------------------------------------------------------------------===//
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// VarDecl Implementation
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//===----------------------------------------------------------------------===//
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VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
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IdentifierInfo *Id, QualType T, StorageClass S,
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SourceLocation TypeSpecStartLoc) {
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return new (C) VarDecl(Var, DC, L, Id, T, S, TypeSpecStartLoc);
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}
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void VarDecl::Destroy(ASTContext& C) {
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Expr *Init = getInit();
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if (Init)
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Init->Destroy(C);
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this->~VarDecl();
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C.Deallocate((void *)this);
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}
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VarDecl::~VarDecl() {
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}
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bool VarDecl::isTentativeDefinition(ASTContext &Context) const {
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if (!isFileVarDecl() || Context.getLangOptions().CPlusPlus)
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return false;
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return (!getInit() &&
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(getStorageClass() == None || getStorageClass() == Static));
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}
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const Expr *VarDecl::getDefinition(const VarDecl *&Def) {
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Def = this;
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while (Def && !Def->getInit())
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Def = Def->getPreviousDeclaration();
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return Def? Def->getInit() : 0;
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}
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//===----------------------------------------------------------------------===//
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// FunctionDecl Implementation
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//===----------------------------------------------------------------------===//
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void FunctionDecl::Destroy(ASTContext& C) {
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if (Body)
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Body->Destroy(C);
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for (param_iterator I=param_begin(), E=param_end(); I!=E; ++I)
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(*I)->Destroy(C);
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C.Deallocate(ParamInfo);
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Decl::Destroy(C);
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}
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CompoundStmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
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for (const FunctionDecl *FD = this; FD != 0; FD = FD->PreviousDeclaration) {
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if (FD->Body) {
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Definition = FD;
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return cast<CompoundStmt>(FD->Body);
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}
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}
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return 0;
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}
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bool FunctionDecl::isMain() const {
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return getDeclContext()->getLookupContext()->isTranslationUnit() &&
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getIdentifier() && getIdentifier()->isStr("main");
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}
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bool FunctionDecl::isExternC(ASTContext &Context) const {
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// In C, any non-static, non-overloadable function has external
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// linkage.
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if (!Context.getLangOptions().CPlusPlus)
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return getStorageClass() != Static && !getAttr<OverloadableAttr>();
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for (const DeclContext *DC = getDeclContext(); !DC->isTranslationUnit();
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DC = DC->getParent()) {
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if (const LinkageSpecDecl *Linkage = dyn_cast<LinkageSpecDecl>(DC)) {
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if (Linkage->getLanguage() == LinkageSpecDecl::lang_c)
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return getStorageClass() != Static && !getAttr<OverloadableAttr>();
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break;
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}
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}
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return false;
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}
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/// \brief Returns a value indicating whether this function
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/// corresponds to a builtin function.
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///
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/// The function corresponds to a built-in function if it is
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/// declared at translation scope or within an extern "C" block and
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/// its name matches with the name of a builtin. The returned value
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/// will be 0 for functions that do not correspond to a builtin, a
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/// value of type \c Builtin::ID if in the target-independent range
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/// \c [1,Builtin::First), or a target-specific builtin value.
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unsigned FunctionDecl::getBuiltinID(ASTContext &Context) const {
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if (!getIdentifier() || !getIdentifier()->getBuiltinID())
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return 0;
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unsigned BuiltinID = getIdentifier()->getBuiltinID();
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if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
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return BuiltinID;
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// This function has the name of a known C library
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// function. Determine whether it actually refers to the C library
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// function or whether it just has the same name.
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// If this is a static function, it's not a builtin.
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if (getStorageClass() == Static)
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return 0;
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// If this function is at translation-unit scope and we're not in
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// C++, it refers to the C library function.
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if (!Context.getLangOptions().CPlusPlus &&
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getDeclContext()->isTranslationUnit())
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return BuiltinID;
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// If the function is in an extern "C" linkage specification and is
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// not marked "overloadable", it's the real function.
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if (isa<LinkageSpecDecl>(getDeclContext()) &&
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cast<LinkageSpecDecl>(getDeclContext())->getLanguage()
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== LinkageSpecDecl::lang_c &&
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!getAttr<OverloadableAttr>())
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return BuiltinID;
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// Not a builtin
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return 0;
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}
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// Helper function for FunctionDecl::getNumParams and FunctionDecl::setParams()
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static unsigned getNumTypeParams(QualType T) {
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const FunctionType *FT = T->getAsFunctionType();
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if (isa<FunctionNoProtoType>(FT))
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return 0;
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return cast<FunctionProtoType>(FT)->getNumArgs();
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}
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unsigned FunctionDecl::getNumParams() const {
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// Can happen if a FunctionDecl is declared using typeof(some_other_func) bar;
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if (!ParamInfo)
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return 0;
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return getNumTypeParams(getType());
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}
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void FunctionDecl::setParams(ASTContext& C, ParmVarDecl **NewParamInfo,
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unsigned NumParams) {
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assert(ParamInfo == 0 && "Already has param info!");
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assert(NumParams == getNumTypeParams(getType()) &&
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"Parameter count mismatch!");
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// Zero params -> null pointer.
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if (NumParams) {
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void *Mem = C.Allocate(sizeof(ParmVarDecl*)*NumParams);
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ParamInfo = new (Mem) ParmVarDecl*[NumParams];
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memcpy(ParamInfo, NewParamInfo, sizeof(ParmVarDecl*)*NumParams);
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}
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}
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/// getMinRequiredArguments - Returns the minimum number of arguments
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/// needed to call this function. This may be fewer than the number of
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/// function parameters, if some of the parameters have default
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/// arguments (in C++).
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unsigned FunctionDecl::getMinRequiredArguments() const {
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unsigned NumRequiredArgs = getNumParams();
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while (NumRequiredArgs > 0
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&& getParamDecl(NumRequiredArgs-1)->getDefaultArg())
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--NumRequiredArgs;
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return NumRequiredArgs;
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}
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/// getOverloadedOperator - Which C++ overloaded operator this
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/// function represents, if any.
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OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
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if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
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return getDeclName().getCXXOverloadedOperator();
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else
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return OO_None;
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}
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//===----------------------------------------------------------------------===//
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// TagDecl Implementation
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//===----------------------------------------------------------------------===//
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void TagDecl::startDefinition() {
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TagType *TagT = const_cast<TagType *>(TypeForDecl->getAsTagType());
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TagT->decl.setPointer(this);
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TagT->getAsTagType()->decl.setInt(1);
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}
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void TagDecl::completeDefinition() {
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assert((!TypeForDecl ||
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TypeForDecl->getAsTagType()->decl.getPointer() == this) &&
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"Attempt to redefine a tag definition?");
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IsDefinition = true;
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TagType *TagT = const_cast<TagType *>(TypeForDecl->getAsTagType());
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TagT->decl.setPointer(this);
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TagT->decl.setInt(0);
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}
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TagDecl* TagDecl::getDefinition(ASTContext& C) const {
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QualType T = C.getTypeDeclType(const_cast<TagDecl*>(this));
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TagDecl* D = cast<TagDecl>(T->getAsTagType()->getDecl());
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return D->isDefinition() ? D : 0;
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}
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//===----------------------------------------------------------------------===//
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// RecordDecl Implementation
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//===----------------------------------------------------------------------===//
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RecordDecl::RecordDecl(Kind DK, TagKind TK, DeclContext *DC, SourceLocation L,
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IdentifierInfo *Id)
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: TagDecl(DK, TK, DC, L, Id) {
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HasFlexibleArrayMember = false;
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AnonymousStructOrUnion = false;
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assert(classof(static_cast<Decl*>(this)) && "Invalid Kind!");
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}
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RecordDecl *RecordDecl::Create(ASTContext &C, TagKind TK, DeclContext *DC,
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SourceLocation L, IdentifierInfo *Id,
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RecordDecl* PrevDecl) {
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RecordDecl* R = new (C) RecordDecl(Record, TK, DC, L, Id);
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C.getTypeDeclType(R, PrevDecl);
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return R;
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}
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RecordDecl::~RecordDecl() {
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}
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void RecordDecl::Destroy(ASTContext& C) {
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TagDecl::Destroy(C);
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}
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/// completeDefinition - Notes that the definition of this type is now
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/// complete.
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void RecordDecl::completeDefinition(ASTContext& C) {
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assert(!isDefinition() && "Cannot redefine record!");
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TagDecl::completeDefinition();
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}
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//===----------------------------------------------------------------------===//
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// BlockDecl Implementation
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//===----------------------------------------------------------------------===//
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BlockDecl::~BlockDecl() {
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}
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void BlockDecl::Destroy(ASTContext& C) {
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if (Body)
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Body->Destroy(C);
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for (param_iterator I=param_begin(), E=param_end(); I!=E; ++I)
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(*I)->Destroy(C);
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C.Deallocate(ParamInfo);
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Decl::Destroy(C);
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}
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void BlockDecl::setParams(ASTContext& C, ParmVarDecl **NewParamInfo,
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unsigned NParms) {
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assert(ParamInfo == 0 && "Already has param info!");
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// Zero params -> null pointer.
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if (NParms) {
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NumParams = NParms;
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void *Mem = C.Allocate(sizeof(ParmVarDecl*)*NumParams);
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ParamInfo = new (Mem) ParmVarDecl*[NumParams];
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memcpy(ParamInfo, NewParamInfo, sizeof(ParmVarDecl*)*NumParams);
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}
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}
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unsigned BlockDecl::getNumParams() const {
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return NumParams;
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}
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