632 lines
20 KiB
C++
632 lines
20 KiB
C++
//===--- NestedNameSpecifier.cpp - C++ nested name specifiers -----*- C++ -*-=//
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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 defines the NestedNameSpecifier class, which represents
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// a C++ nested-name-specifier.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/NestedNameSpecifier.h"
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#include "clang/AST/ASTContext.h"
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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/PrettyPrinter.h"
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#include "clang/AST/Type.h"
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#include "clang/AST/TypeLoc.h"
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#include "llvm/Support/AlignOf.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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using namespace clang;
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NestedNameSpecifier *
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NestedNameSpecifier::FindOrInsert(const ASTContext &Context,
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const NestedNameSpecifier &Mockup) {
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llvm::FoldingSetNodeID ID;
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Mockup.Profile(ID);
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void *InsertPos = 0;
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NestedNameSpecifier *NNS
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= Context.NestedNameSpecifiers.FindNodeOrInsertPos(ID, InsertPos);
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if (!NNS) {
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NNS = new (Context, llvm::alignOf<NestedNameSpecifier>())
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NestedNameSpecifier(Mockup);
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Context.NestedNameSpecifiers.InsertNode(NNS, InsertPos);
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}
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return NNS;
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}
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NestedNameSpecifier *
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NestedNameSpecifier::Create(const ASTContext &Context,
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NestedNameSpecifier *Prefix, IdentifierInfo *II) {
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assert(II && "Identifier cannot be NULL");
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assert((!Prefix || Prefix->isDependent()) && "Prefix must be dependent");
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NestedNameSpecifier Mockup;
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Mockup.Prefix.setPointer(Prefix);
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Mockup.Prefix.setInt(StoredIdentifier);
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Mockup.Specifier = II;
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return FindOrInsert(Context, Mockup);
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}
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NestedNameSpecifier *
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NestedNameSpecifier::Create(const ASTContext &Context,
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NestedNameSpecifier *Prefix,
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const NamespaceDecl *NS) {
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assert(NS && "Namespace cannot be NULL");
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assert((!Prefix ||
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(Prefix->getAsType() == 0 && Prefix->getAsIdentifier() == 0)) &&
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"Broken nested name specifier");
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NestedNameSpecifier Mockup;
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Mockup.Prefix.setPointer(Prefix);
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Mockup.Prefix.setInt(StoredNamespaceOrAlias);
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Mockup.Specifier = const_cast<NamespaceDecl *>(NS);
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return FindOrInsert(Context, Mockup);
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}
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NestedNameSpecifier *
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NestedNameSpecifier::Create(const ASTContext &Context,
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NestedNameSpecifier *Prefix,
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NamespaceAliasDecl *Alias) {
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assert(Alias && "Namespace alias cannot be NULL");
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assert((!Prefix ||
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(Prefix->getAsType() == 0 && Prefix->getAsIdentifier() == 0)) &&
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"Broken nested name specifier");
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NestedNameSpecifier Mockup;
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Mockup.Prefix.setPointer(Prefix);
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Mockup.Prefix.setInt(StoredNamespaceOrAlias);
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Mockup.Specifier = Alias;
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return FindOrInsert(Context, Mockup);
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}
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NestedNameSpecifier *
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NestedNameSpecifier::Create(const ASTContext &Context,
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NestedNameSpecifier *Prefix,
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bool Template, const Type *T) {
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assert(T && "Type cannot be NULL");
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NestedNameSpecifier Mockup;
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Mockup.Prefix.setPointer(Prefix);
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Mockup.Prefix.setInt(Template? StoredTypeSpecWithTemplate : StoredTypeSpec);
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Mockup.Specifier = const_cast<Type*>(T);
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return FindOrInsert(Context, Mockup);
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}
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NestedNameSpecifier *
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NestedNameSpecifier::Create(const ASTContext &Context, IdentifierInfo *II) {
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assert(II && "Identifier cannot be NULL");
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NestedNameSpecifier Mockup;
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Mockup.Prefix.setPointer(0);
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Mockup.Prefix.setInt(StoredIdentifier);
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Mockup.Specifier = II;
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return FindOrInsert(Context, Mockup);
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}
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NestedNameSpecifier *
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NestedNameSpecifier::GlobalSpecifier(const ASTContext &Context) {
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if (!Context.GlobalNestedNameSpecifier)
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Context.GlobalNestedNameSpecifier =
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new (Context, llvm::alignOf<NestedNameSpecifier>())
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NestedNameSpecifier();
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return Context.GlobalNestedNameSpecifier;
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}
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NestedNameSpecifier::SpecifierKind NestedNameSpecifier::getKind() const {
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if (Specifier == 0)
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return Global;
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switch (Prefix.getInt()) {
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case StoredIdentifier:
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return Identifier;
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case StoredNamespaceOrAlias:
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return isa<NamespaceDecl>(static_cast<NamedDecl *>(Specifier))? Namespace
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: NamespaceAlias;
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case StoredTypeSpec:
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return TypeSpec;
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case StoredTypeSpecWithTemplate:
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return TypeSpecWithTemplate;
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}
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llvm_unreachable("Invalid NNS Kind!");
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}
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/// \brief Retrieve the namespace stored in this nested name
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/// specifier.
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NamespaceDecl *NestedNameSpecifier::getAsNamespace() const {
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if (Prefix.getInt() == StoredNamespaceOrAlias)
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return dyn_cast<NamespaceDecl>(static_cast<NamedDecl *>(Specifier));
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return 0;
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}
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/// \brief Retrieve the namespace alias stored in this nested name
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/// specifier.
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NamespaceAliasDecl *NestedNameSpecifier::getAsNamespaceAlias() const {
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if (Prefix.getInt() == StoredNamespaceOrAlias)
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return dyn_cast<NamespaceAliasDecl>(static_cast<NamedDecl *>(Specifier));
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return 0;
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}
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/// \brief Whether this nested name specifier refers to a dependent
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/// type or not.
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bool NestedNameSpecifier::isDependent() const {
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switch (getKind()) {
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case Identifier:
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// Identifier specifiers always represent dependent types
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return true;
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case Namespace:
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case NamespaceAlias:
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case Global:
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return false;
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case TypeSpec:
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case TypeSpecWithTemplate:
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return getAsType()->isDependentType();
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}
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llvm_unreachable("Invalid NNS Kind!");
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}
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/// \brief Whether this nested name specifier refers to a dependent
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/// type or not.
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bool NestedNameSpecifier::isInstantiationDependent() const {
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switch (getKind()) {
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case Identifier:
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// Identifier specifiers always represent dependent types
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return true;
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case Namespace:
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case NamespaceAlias:
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case Global:
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return false;
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case TypeSpec:
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case TypeSpecWithTemplate:
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return getAsType()->isInstantiationDependentType();
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}
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llvm_unreachable("Invalid NNS Kind!");
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}
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bool NestedNameSpecifier::containsUnexpandedParameterPack() const {
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switch (getKind()) {
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case Identifier:
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return getPrefix() && getPrefix()->containsUnexpandedParameterPack();
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case Namespace:
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case NamespaceAlias:
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case Global:
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return false;
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case TypeSpec:
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case TypeSpecWithTemplate:
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return getAsType()->containsUnexpandedParameterPack();
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}
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llvm_unreachable("Invalid NNS Kind!");
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}
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/// \brief Print this nested name specifier to the given output
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/// stream.
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void
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NestedNameSpecifier::print(raw_ostream &OS,
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const PrintingPolicy &Policy) const {
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if (getPrefix())
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getPrefix()->print(OS, Policy);
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switch (getKind()) {
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case Identifier:
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OS << getAsIdentifier()->getName();
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break;
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case Namespace:
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if (getAsNamespace()->isAnonymousNamespace())
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return;
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OS << getAsNamespace()->getName();
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break;
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case NamespaceAlias:
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OS << getAsNamespaceAlias()->getName();
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break;
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case Global:
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break;
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case TypeSpecWithTemplate:
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OS << "template ";
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// Fall through to print the type.
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case TypeSpec: {
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const Type *T = getAsType();
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PrintingPolicy InnerPolicy(Policy);
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InnerPolicy.SuppressScope = true;
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// Nested-name-specifiers are intended to contain minimally-qualified
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// types. An actual ElaboratedType will not occur, since we'll store
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// just the type that is referred to in the nested-name-specifier (e.g.,
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// a TypedefType, TagType, etc.). However, when we are dealing with
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// dependent template-id types (e.g., Outer<T>::template Inner<U>),
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// the type requires its own nested-name-specifier for uniqueness, so we
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// suppress that nested-name-specifier during printing.
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assert(!isa<ElaboratedType>(T) &&
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"Elaborated type in nested-name-specifier");
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if (const TemplateSpecializationType *SpecType
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= dyn_cast<TemplateSpecializationType>(T)) {
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// Print the template name without its corresponding
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// nested-name-specifier.
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SpecType->getTemplateName().print(OS, InnerPolicy, true);
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// Print the template argument list.
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TemplateSpecializationType::PrintTemplateArgumentList(
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OS, SpecType->getArgs(), SpecType->getNumArgs(), InnerPolicy);
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} else {
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// Print the type normally
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QualType(T, 0).print(OS, InnerPolicy);
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}
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break;
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}
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}
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OS << "::";
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}
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void NestedNameSpecifier::dump(const LangOptions &LO) {
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print(llvm::errs(), PrintingPolicy(LO));
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}
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unsigned
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NestedNameSpecifierLoc::getLocalDataLength(NestedNameSpecifier *Qualifier) {
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assert(Qualifier && "Expected a non-NULL qualifier");
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// Location of the trailing '::'.
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unsigned Length = sizeof(unsigned);
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switch (Qualifier->getKind()) {
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case NestedNameSpecifier::Global:
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// Nothing more to add.
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break;
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case NestedNameSpecifier::Identifier:
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case NestedNameSpecifier::Namespace:
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case NestedNameSpecifier::NamespaceAlias:
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// The location of the identifier or namespace name.
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Length += sizeof(unsigned);
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break;
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case NestedNameSpecifier::TypeSpecWithTemplate:
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case NestedNameSpecifier::TypeSpec:
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// The "void*" that points at the TypeLoc data.
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// Note: the 'template' keyword is part of the TypeLoc.
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Length += sizeof(void *);
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break;
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}
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return Length;
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}
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unsigned
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NestedNameSpecifierLoc::getDataLength(NestedNameSpecifier *Qualifier) {
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unsigned Length = 0;
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for (; Qualifier; Qualifier = Qualifier->getPrefix())
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Length += getLocalDataLength(Qualifier);
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return Length;
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}
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namespace {
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/// \brief Load a (possibly unaligned) source location from a given address
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/// and offset.
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SourceLocation LoadSourceLocation(void *Data, unsigned Offset) {
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unsigned Raw;
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memcpy(&Raw, static_cast<char *>(Data) + Offset, sizeof(unsigned));
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return SourceLocation::getFromRawEncoding(Raw);
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}
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/// \brief Load a (possibly unaligned) pointer from a given address and
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/// offset.
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void *LoadPointer(void *Data, unsigned Offset) {
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void *Result;
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memcpy(&Result, static_cast<char *>(Data) + Offset, sizeof(void*));
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return Result;
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}
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}
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SourceRange NestedNameSpecifierLoc::getSourceRange() const {
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if (!Qualifier)
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return SourceRange();
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NestedNameSpecifierLoc First = *this;
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while (NestedNameSpecifierLoc Prefix = First.getPrefix())
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First = Prefix;
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return SourceRange(First.getLocalSourceRange().getBegin(),
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getLocalSourceRange().getEnd());
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}
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SourceRange NestedNameSpecifierLoc::getLocalSourceRange() const {
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if (!Qualifier)
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return SourceRange();
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unsigned Offset = getDataLength(Qualifier->getPrefix());
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switch (Qualifier->getKind()) {
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case NestedNameSpecifier::Global:
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return LoadSourceLocation(Data, Offset);
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case NestedNameSpecifier::Identifier:
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case NestedNameSpecifier::Namespace:
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case NestedNameSpecifier::NamespaceAlias:
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return SourceRange(LoadSourceLocation(Data, Offset),
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LoadSourceLocation(Data, Offset + sizeof(unsigned)));
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case NestedNameSpecifier::TypeSpecWithTemplate:
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case NestedNameSpecifier::TypeSpec: {
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// The "void*" that points at the TypeLoc data.
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// Note: the 'template' keyword is part of the TypeLoc.
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void *TypeData = LoadPointer(Data, Offset);
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TypeLoc TL(Qualifier->getAsType(), TypeData);
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return SourceRange(TL.getBeginLoc(),
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LoadSourceLocation(Data, Offset + sizeof(void*)));
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}
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}
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llvm_unreachable("Invalid NNS Kind!");
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}
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TypeLoc NestedNameSpecifierLoc::getTypeLoc() const {
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assert((Qualifier->getKind() == NestedNameSpecifier::TypeSpec ||
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Qualifier->getKind() == NestedNameSpecifier::TypeSpecWithTemplate) &&
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"Nested-name-specifier location is not a type");
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// The "void*" that points at the TypeLoc data.
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unsigned Offset = getDataLength(Qualifier->getPrefix());
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void *TypeData = LoadPointer(Data, Offset);
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return TypeLoc(Qualifier->getAsType(), TypeData);
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}
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namespace {
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void Append(char *Start, char *End, char *&Buffer, unsigned &BufferSize,
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unsigned &BufferCapacity) {
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if (BufferSize + (End - Start) > BufferCapacity) {
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// Reallocate the buffer.
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unsigned NewCapacity
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= std::max((unsigned)(BufferCapacity? BufferCapacity * 2
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: sizeof(void*) * 2),
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(unsigned)(BufferSize + (End - Start)));
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char *NewBuffer = static_cast<char *>(malloc(NewCapacity));
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memcpy(NewBuffer, Buffer, BufferSize);
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if (BufferCapacity)
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free(Buffer);
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Buffer = NewBuffer;
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BufferCapacity = NewCapacity;
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}
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memcpy(Buffer + BufferSize, Start, End - Start);
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BufferSize += End-Start;
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}
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/// \brief Save a source location to the given buffer.
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void SaveSourceLocation(SourceLocation Loc, char *&Buffer,
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unsigned &BufferSize, unsigned &BufferCapacity) {
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unsigned Raw = Loc.getRawEncoding();
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Append(reinterpret_cast<char *>(&Raw),
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reinterpret_cast<char *>(&Raw) + sizeof(unsigned),
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Buffer, BufferSize, BufferCapacity);
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}
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/// \brief Save a pointer to the given buffer.
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void SavePointer(void *Ptr, char *&Buffer, unsigned &BufferSize,
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unsigned &BufferCapacity) {
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Append(reinterpret_cast<char *>(&Ptr),
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reinterpret_cast<char *>(&Ptr) + sizeof(void *),
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Buffer, BufferSize, BufferCapacity);
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}
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}
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NestedNameSpecifierLocBuilder::
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NestedNameSpecifierLocBuilder(const NestedNameSpecifierLocBuilder &Other)
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: Representation(Other.Representation), Buffer(0),
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BufferSize(0), BufferCapacity(0)
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{
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if (!Other.Buffer)
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return;
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if (Other.BufferCapacity == 0) {
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// Shallow copy is okay.
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Buffer = Other.Buffer;
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BufferSize = Other.BufferSize;
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return;
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}
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// Deep copy
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BufferSize = Other.BufferSize;
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BufferCapacity = Other.BufferSize;
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Buffer = static_cast<char *>(malloc(BufferCapacity));
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memcpy(Buffer, Other.Buffer, BufferSize);
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}
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NestedNameSpecifierLocBuilder &
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NestedNameSpecifierLocBuilder::
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operator=(const NestedNameSpecifierLocBuilder &Other) {
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Representation = Other.Representation;
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if (Buffer && Other.Buffer && BufferCapacity >= Other.BufferSize) {
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// Re-use our storage.
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BufferSize = Other.BufferSize;
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memcpy(Buffer, Other.Buffer, BufferSize);
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return *this;
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}
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// Free our storage, if we have any.
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if (BufferCapacity) {
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free(Buffer);
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BufferCapacity = 0;
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}
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if (!Other.Buffer) {
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// Empty.
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Buffer = 0;
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BufferSize = 0;
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return *this;
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}
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if (Other.BufferCapacity == 0) {
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// Shallow copy is okay.
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Buffer = Other.Buffer;
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BufferSize = Other.BufferSize;
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return *this;
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}
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// Deep copy.
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BufferSize = Other.BufferSize;
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BufferCapacity = BufferSize;
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Buffer = static_cast<char *>(malloc(BufferSize));
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memcpy(Buffer, Other.Buffer, BufferSize);
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return *this;
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}
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void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
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SourceLocation TemplateKWLoc,
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TypeLoc TL,
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SourceLocation ColonColonLoc) {
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Representation = NestedNameSpecifier::Create(Context, Representation,
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TemplateKWLoc.isValid(),
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TL.getTypePtr());
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// Push source-location info into the buffer.
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SavePointer(TL.getOpaqueData(), Buffer, BufferSize, BufferCapacity);
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SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
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}
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void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
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IdentifierInfo *Identifier,
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SourceLocation IdentifierLoc,
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SourceLocation ColonColonLoc) {
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Representation = NestedNameSpecifier::Create(Context, Representation,
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Identifier);
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// Push source-location info into the buffer.
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SaveSourceLocation(IdentifierLoc, Buffer, BufferSize, BufferCapacity);
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SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
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}
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void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
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NamespaceDecl *Namespace,
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SourceLocation NamespaceLoc,
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SourceLocation ColonColonLoc) {
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Representation = NestedNameSpecifier::Create(Context, Representation,
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Namespace);
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// Push source-location info into the buffer.
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SaveSourceLocation(NamespaceLoc, Buffer, BufferSize, BufferCapacity);
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SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
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}
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void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
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NamespaceAliasDecl *Alias,
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SourceLocation AliasLoc,
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SourceLocation ColonColonLoc) {
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Representation = NestedNameSpecifier::Create(Context, Representation, Alias);
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// Push source-location info into the buffer.
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SaveSourceLocation(AliasLoc, Buffer, BufferSize, BufferCapacity);
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SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
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}
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void NestedNameSpecifierLocBuilder::MakeGlobal(ASTContext &Context,
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SourceLocation ColonColonLoc) {
|
|
assert(!Representation && "Already have a nested-name-specifier!?");
|
|
Representation = NestedNameSpecifier::GlobalSpecifier(Context);
|
|
|
|
// Push source-location info into the buffer.
|
|
SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
|
|
}
|
|
|
|
void NestedNameSpecifierLocBuilder::MakeTrivial(ASTContext &Context,
|
|
NestedNameSpecifier *Qualifier,
|
|
SourceRange R) {
|
|
Representation = Qualifier;
|
|
|
|
// Construct bogus (but well-formed) source information for the
|
|
// nested-name-specifier.
|
|
BufferSize = 0;
|
|
SmallVector<NestedNameSpecifier *, 4> Stack;
|
|
for (NestedNameSpecifier *NNS = Qualifier; NNS; NNS = NNS->getPrefix())
|
|
Stack.push_back(NNS);
|
|
while (!Stack.empty()) {
|
|
NestedNameSpecifier *NNS = Stack.pop_back_val();
|
|
switch (NNS->getKind()) {
|
|
case NestedNameSpecifier::Identifier:
|
|
case NestedNameSpecifier::Namespace:
|
|
case NestedNameSpecifier::NamespaceAlias:
|
|
SaveSourceLocation(R.getBegin(), Buffer, BufferSize, BufferCapacity);
|
|
break;
|
|
|
|
case NestedNameSpecifier::TypeSpec:
|
|
case NestedNameSpecifier::TypeSpecWithTemplate: {
|
|
TypeSourceInfo *TSInfo
|
|
= Context.getTrivialTypeSourceInfo(QualType(NNS->getAsType(), 0),
|
|
R.getBegin());
|
|
SavePointer(TSInfo->getTypeLoc().getOpaqueData(), Buffer, BufferSize,
|
|
BufferCapacity);
|
|
break;
|
|
}
|
|
|
|
case NestedNameSpecifier::Global:
|
|
break;
|
|
}
|
|
|
|
// Save the location of the '::'.
|
|
SaveSourceLocation(Stack.empty()? R.getEnd() : R.getBegin(),
|
|
Buffer, BufferSize, BufferCapacity);
|
|
}
|
|
}
|
|
|
|
void NestedNameSpecifierLocBuilder::Adopt(NestedNameSpecifierLoc Other) {
|
|
if (BufferCapacity)
|
|
free(Buffer);
|
|
|
|
if (!Other) {
|
|
Representation = 0;
|
|
BufferSize = 0;
|
|
return;
|
|
}
|
|
|
|
// Rather than copying the data (which is wasteful), "adopt" the
|
|
// pointer (which points into the ASTContext) but set the capacity to zero to
|
|
// indicate that we don't own it.
|
|
Representation = Other.getNestedNameSpecifier();
|
|
Buffer = static_cast<char *>(Other.getOpaqueData());
|
|
BufferSize = Other.getDataLength();
|
|
BufferCapacity = 0;
|
|
}
|
|
|
|
NestedNameSpecifierLoc
|
|
NestedNameSpecifierLocBuilder::getWithLocInContext(ASTContext &Context) const {
|
|
if (!Representation)
|
|
return NestedNameSpecifierLoc();
|
|
|
|
// If we adopted our data pointer from elsewhere in the AST context, there's
|
|
// no need to copy the memory.
|
|
if (BufferCapacity == 0)
|
|
return NestedNameSpecifierLoc(Representation, Buffer);
|
|
|
|
// FIXME: After copying the source-location information, should we free
|
|
// our (temporary) buffer and adopt the ASTContext-allocated memory?
|
|
// Doing so would optimize repeated calls to getWithLocInContext().
|
|
void *Mem = Context.Allocate(BufferSize, llvm::alignOf<void *>());
|
|
memcpy(Mem, Buffer, BufferSize);
|
|
return NestedNameSpecifierLoc(Representation, Mem);
|
|
}
|