Parser.cpp 122 KB
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/**************************************************************************
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**
** This file is part of Qt Creator
**
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** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** Commercial Usage
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**
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** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** If you are unsure which license is appropriate for your use, please
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** contact the sales department at http://www.qtsoftware.com/contact.
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**
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**************************************************************************/
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// Copyright (c) 2008 Roberto Raggi <roberto.raggi@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include "Parser.h"
#include "Token.h"
#include "Lexer.h"
#include "Control.h"
#include "AST.h"
#include "Literals.h"
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#include "ObjectiveCTypeQualifiers.h"
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#include <cstdlib>
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#include <cstring>
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#include <cassert>

CPLUSPLUS_BEGIN_NAMESPACE

Parser::Parser(TranslationUnit *unit)
    : _translationUnit(unit),
      _control(_translationUnit->control()),
      _pool(_translationUnit->memoryPool()),
      _tokenIndex(1),
      _templateArguments(0),
      _qtMocRunEnabled(false),
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      _objCEnabled(false),
      _inFunctionBody(false),
      _inObjCImplementationContext(false)
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{ }

Parser::~Parser()
{ }

bool Parser::qtMocRunEnabled() const
{ return _qtMocRunEnabled; }

void Parser::setQtMocRunEnabled(bool onoff)
{ _qtMocRunEnabled = onoff; }

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bool Parser::objCEnabled() const
{ return _objCEnabled; }

void Parser::setObjCEnabled(bool onoff)
{ _objCEnabled = onoff; }

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bool Parser::switchTemplateArguments(bool templateArguments)
{
    bool previousTemplateArguments = _templateArguments;
    _templateArguments = templateArguments;
    return previousTemplateArguments;
}

bool Parser::blockErrors(bool block)
{ return _translationUnit->blockErrors(block); }

bool Parser::skipUntil(int token)
{
    while (int tk = LA()) {
        if (tk == token)
            return true;

        consumeToken();
    }

    return false;
}

bool Parser::skipUntilDeclaration()
{
    while (int tk = LA()) {
        switch (tk) {
            case T_SEMICOLON:
            case T_TILDE:
            case T_COLON_COLON:
            case T_IDENTIFIER:
            case T_OPERATOR:
            case T_CHAR:
            case T_WCHAR_T:
            case T_BOOL:
            case T_SHORT:
            case T_INT:
            case T_LONG:
            case T_SIGNED:
            case T_UNSIGNED:
            case T_FLOAT:
            case T_DOUBLE:
            case T_VOID:
            case T_EXTERN:
            case T_NAMESPACE:
            case T_USING:
            case T_TYPEDEF:
            case T_ASM:
            case T_TEMPLATE:
            case T_EXPORT:
            case T_CONST:
            case T_VOLATILE:
            case T_PUBLIC:
            case T_PROTECTED:
            case T_PRIVATE:
                return true;

            default:
                consumeToken();
        }
    }

    return false;
}

bool Parser::skipUntilStatement()
{
    while (int tk = LA()) {
        switch (tk) {
            case T_SEMICOLON:
            case T_LBRACE:
            case T_RBRACE:
            case T_CONST:
            case T_VOLATILE:
            case T_IDENTIFIER:
            case T_CASE:
            case T_DEFAULT:
            case T_IF:
            case T_SWITCH:
            case T_WHILE:
            case T_DO:
            case T_FOR:
            case T_BREAK:
            case T_CONTINUE:
            case T_RETURN:
            case T_GOTO:
            case T_TRY:
            case T_CATCH:
            case T_THROW:
            case T_CHAR:
            case T_WCHAR_T:
            case T_BOOL:
            case T_SHORT:
            case T_INT:
            case T_LONG:
            case T_SIGNED:
            case T_UNSIGNED:
            case T_FLOAT:
            case T_DOUBLE:
            case T_VOID:
            case T_CLASS:
            case T_STRUCT:
            case T_UNION:
            case T_ENUM:
            case T_COLON_COLON:
            case T_TEMPLATE:
            case T_USING:
                return true;

            default:
                consumeToken();
        }
    }

    return false;
}

bool Parser::skip(int l, int r)
{
    int count = 0;

    while (int tk = LA()) {
        if (tk == l)
            ++count;
        else if (tk == r)
            --count;
        else if (l != T_LBRACE && (tk == T_LBRACE ||
                                   tk == T_RBRACE ||
                                   tk == T_SEMICOLON))
            return false;

        if (count == 0)
            return true;

        consumeToken();
    }

    return false;
}

void Parser::match(int kind, unsigned *token)
{
    if (LA() == kind)
        *token = consumeToken();
    else {
        *token = 0;
        _translationUnit->error(_tokenIndex, "expected token `%s' got `%s'",
                                Token::name(kind), tok().spell());
    }
}

bool Parser::parseClassOrNamespaceName(NameAST *&node)
{
    if (LA() == T_IDENTIFIER) {
        unsigned identifier_token = cursor();

        if (LA(2) == T_LESS && parseTemplateId(node) && LA() == T_COLON_COLON)
            return true;

        rewind(identifier_token);

        if (LA(2) == T_COLON_COLON) {
            SimpleNameAST *ast = new (_pool) SimpleNameAST;
            ast->identifier_token = consumeToken();
            node = ast;
            return true;
        }
    } else if (LA() == T_TEMPLATE) {
        unsigned template_token = consumeToken();
        if (parseTemplateId(node))
            return true;
        rewind(template_token);
    }
    return false;
}

bool Parser::parseTemplateId(NameAST *&node)
{
    if (LA() == T_IDENTIFIER && LA(2) == T_LESS) {
        TemplateIdAST *ast = new (_pool) TemplateIdAST;
        ast->identifier_token = consumeToken();
        ast->less_token = consumeToken();
        if (LA() == T_GREATER || parseTemplateArgumentList(
                ast->template_arguments)) {
            if (LA() == T_GREATER) {
                ast->greater_token = consumeToken();
                node = ast;
                return true;
            }
        }
    }
    return false;
}

bool Parser::parseNestedNameSpecifier(NestedNameSpecifierAST *&node,
                                      bool /*acceptTemplateId*/)
{
    NestedNameSpecifierAST **nested_name_specifier = &node;
    NameAST *class_or_namespace_name = 0;
    if (parseClassOrNamespaceName(class_or_namespace_name) &&
            LA() == T_COLON_COLON) {
        unsigned scope_token = consumeToken();
        *nested_name_specifier = new (_pool) NestedNameSpecifierAST;
        (*nested_name_specifier)->class_or_namespace_name
                = class_or_namespace_name;
        (*nested_name_specifier)->scope_token = scope_token;

        nested_name_specifier = &(*nested_name_specifier)->next;

        while (parseClassOrNamespaceName(class_or_namespace_name) &&
               LA() == T_COLON_COLON) {
            scope_token = consumeToken();
            *nested_name_specifier = new (_pool) NestedNameSpecifierAST;
            (*nested_name_specifier)->class_or_namespace_name = class_or_namespace_name;
            (*nested_name_specifier)->scope_token = scope_token;
            nested_name_specifier = &(*nested_name_specifier)->next;
        }

        // ### ugly hack
        rewind(scope_token);
        consumeToken();
        return true;
    }

    return false;
}

bool Parser::parseNestedNameSpecifierOpt(NestedNameSpecifierAST *&name,
        bool acceptTemplateId)
{
    unsigned start = cursor();
    if (! parseNestedNameSpecifier(name, acceptTemplateId))
        rewind(start);
    return true;
}

bool Parser::parseName(NameAST *&node, bool acceptTemplateId)
{
    unsigned global_scope_token = 0;
    if (LA() == T_COLON_COLON)
        global_scope_token = consumeToken();

    NestedNameSpecifierAST *nested_name_specifier = 0;
    parseNestedNameSpecifierOpt(nested_name_specifier,
                                /*acceptTemplateId=*/ true);

    NameAST *unqualified_name = 0;
    if (parseUnqualifiedName(unqualified_name,
                             /*acceptTemplateId=*/ acceptTemplateId || nested_name_specifier != 0)) {
        if (! global_scope_token && ! nested_name_specifier) {
            node = unqualified_name;
            return true;
        }

        QualifiedNameAST *ast = new (_pool) QualifiedNameAST;
        ast->global_scope_token = global_scope_token;
        ast->nested_name_specifier = nested_name_specifier;
        ast->unqualified_name = unqualified_name;
        node = ast;
        return true;
    }

    return false;
}

bool Parser::parseTranslationUnit(TranslationUnitAST *&node)
{
    TranslationUnitAST *ast = new (_pool) TranslationUnitAST;
    DeclarationAST **decl = &ast->declarations;

    while (LA()) {
        unsigned start_declaration = cursor();

        if (parseDeclaration(*decl)) {
            if (*decl)
                decl = &(*decl)->next;
        } else {
            rewind(start_declaration + 1);
            skipUntilDeclaration();
        }
    }

    node = ast;
    return true;
}

bool Parser::parseEmptyDeclaration(DeclarationAST *&node)
{
    if (LA() == T_SEMICOLON) {
        EmptyDeclarationAST *ast = new (_pool) EmptyDeclarationAST;
        ast->semicolon_token = consumeToken();
        node = ast;
        return true;
    }
    return false;
}

bool Parser::parseDeclaration(DeclarationAST *&node)
{
    switch (LA()) {
    case T_SEMICOLON:
        return parseEmptyDeclaration(node);

    case T_NAMESPACE:
        return parseNamespace(node);

    case T_USING:
        return parseUsing(node);

    case T_ASM:
        return parseAsmDefinition(node);

    case T_TEMPLATE:
    case T_EXPORT:
        return parseTemplateDeclaration(node);

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    // ObjcC++
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    case T_AT_CLASS:
        return parseObjCClassDeclaration(node);

    case T_AT_INTERFACE:
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        return parseObjCInterface(node);
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    case T_AT_PROTOCOL:
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        return parseObjCProtocol(node);
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    case T_AT_IMPLEMENTATION:
        return parseObjCImplementation(node);

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    case T_AT_END:
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        return parseObjCEnd(node);
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    default: {
        if (_objCEnabled && LA() == T___ATTRIBUTE__) {
            const unsigned start = cursor();
            SpecifierAST *attributes = 0, **attr = &attributes;
            while (parseAttributeSpecifier(*attr))
                attr = &(*attr)->next;
            if (LA() == T_AT_INTERFACE)
                return parseObjCInterface(node, attributes);
            else if (LA() == T_AT_PROTOCOL)
                return parseObjCProtocol(node, attributes);
            else if (LA() == T_AT_PROPERTY)
                return parseObjCPropertyDeclaration(node, attributes);
            rewind(start);
        }
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        if (LA() == T_EXTERN && LA(2) == T_TEMPLATE)
            return parseTemplateDeclaration(node);
        else if (LA() == T_EXTERN && LA(2) == T_STRING_LITERAL)
            return parseLinkageSpecification(node);
        else
            return parseSimpleDeclaration(node);
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    }   break; // default

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    } // end switch
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    return false;
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}

bool Parser::parseLinkageSpecification(DeclarationAST *&node)
{
    if (LA() == T_EXTERN && LA(2) == T_STRING_LITERAL) {
        LinkageSpecificationAST *ast = new (_pool) LinkageSpecificationAST;
        ast->extern_token = consumeToken();
        ast->extern_type = consumeToken();

        if (LA() == T_LBRACE)
            parseLinkageBody(ast->declaration);
        else
            parseDeclaration(ast->declaration);

        node = ast;
        return true;
    }

    return false;
}

bool Parser::parseLinkageBody(DeclarationAST *&node)
{
    if (LA() == T_LBRACE) {
        LinkageBodyAST *ast = new (_pool) LinkageBodyAST;
        ast->lbrace_token = consumeToken();
        DeclarationAST **declaration_ptr = &ast->declarations;

        while (int tk = LA()) {
            if (tk == T_RBRACE)
                break;

            unsigned start_declaration = cursor();
            if (parseDeclaration(*declaration_ptr)) {
                if (*declaration_ptr) // ### remove me
                    declaration_ptr = &(*declaration_ptr)->next;
            } else {
                rewind(start_declaration + 1);
                skipUntilDeclaration();
            }
        }
        match(T_RBRACE, &ast->rbrace_token);
        node = ast;
        return true;
    }
    return false;
}

// ### rename parseNamespaceAliarOrDeclaration?
bool Parser::parseNamespace(DeclarationAST *&node)
{
    if (LA() != T_NAMESPACE)
        return false;

    unsigned namespace_token = consumeToken();

    if (LA() == T_IDENTIFIER && LA(2) == T_EQUAL) {
        NamespaceAliasDefinitionAST *ast =
                new (_pool) NamespaceAliasDefinitionAST;
        ast->namespace_token = namespace_token;
        ast->namespace_name = consumeToken();
        ast->equal_token = consumeToken();
        parseName(ast->name);
        match(T_SEMICOLON, &ast->semicolon_token);
        node = ast;
        return true;
    }

    NamespaceAST *ast = new (_pool) NamespaceAST;
    ast->namespace_token = namespace_token;
    if (LA() == T_IDENTIFIER)
        ast->identifier_token = consumeToken();
    SpecifierAST **attr_ptr = &ast->attributes;
    while (LA() == T___ATTRIBUTE__) {
        parseAttributeSpecifier(*attr_ptr);
        attr_ptr = &(*attr_ptr)->next;
    }
    if (LA() == T_LBRACE)
        parseLinkageBody(ast->linkage_body);
    node = ast;
    return true;
}

bool Parser::parseUsing(DeclarationAST *&node)
{
    if (LA() != T_USING)
        return false;

    if (LA(2) == T_NAMESPACE)
        return parseUsingDirective(node);

    UsingAST *ast = new (_pool) UsingAST;
    ast->using_token = consumeToken();

    if (LA() == T_TYPENAME)
        ast->typename_token = consumeToken();

    parseName(ast->name);
    match(T_SEMICOLON, &ast->semicolon_token);
    node = ast;
    return true;
}

bool Parser::parseUsingDirective(DeclarationAST *&node)
{
    if (LA() == T_USING && LA(2) == T_NAMESPACE) {
        UsingDirectiveAST *ast = new (_pool) UsingDirectiveAST;
        ast->using_token = consumeToken();
        ast->namespace_token = consumeToken();
        if (! parseName(ast->name))
            _translationUnit->warning(cursor(), "expected `namespace name' before `%s'",
                                      tok().spell());
        match(T_SEMICOLON, &ast->semicolon_token);
        node = ast;
        return true;
    }
    return false;
}

bool Parser::parseConversionFunctionId(NameAST *&node)
{
    if (LA() != T_OPERATOR)
        return false;
    unsigned operator_token = consumeToken();
    SpecifierAST *type_specifier = 0;
    if (! parseTypeSpecifier(type_specifier)) {
        return false;
    }
    PtrOperatorAST *ptr_operators = 0, **ptr_operators_tail = &ptr_operators;
    while (parsePtrOperator(*ptr_operators_tail))
        ptr_operators_tail = &(*ptr_operators_tail)->next;

    ConversionFunctionIdAST *ast = new (_pool) ConversionFunctionIdAST;
    ast->operator_token = operator_token;
    ast->type_specifier = type_specifier;
    ast->ptr_operators = ptr_operators;
    node = ast;
    return true;
}

bool Parser::parseOperatorFunctionId(NameAST *&node)
{
    if (LA() != T_OPERATOR)
        return false;
    unsigned operator_token = consumeToken();

    OperatorAST *op = 0;
    if (! parseOperator(op))
        return false;

    OperatorFunctionIdAST *ast = new (_pool) OperatorFunctionIdAST;
    ast->operator_token = operator_token;
    ast->op = op;
    node = ast;
    return true;
}

bool Parser::parseTemplateArgumentList(TemplateArgumentListAST *&node)
{
    TemplateArgumentListAST **template_argument_ptr = &node;
    ExpressionAST *template_argument = 0;
    if (parseTemplateArgument(template_argument)) {
        *template_argument_ptr = new (_pool) TemplateArgumentListAST;
        (*template_argument_ptr)->template_argument = template_argument;
        template_argument_ptr = &(*template_argument_ptr)->next;
        while (LA() == T_COMMA) {
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            unsigned comma_token = consumeToken();
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            if (parseTemplateArgument(template_argument)) {
                *template_argument_ptr = new (_pool) TemplateArgumentListAST;
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                (*template_argument_ptr)->comma_token = comma_token;
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                (*template_argument_ptr)->template_argument = template_argument;
                template_argument_ptr = &(*template_argument_ptr)->next;
            }
        }
        return true;
    }
    return false;
}

bool Parser::parseAsmDefinition(DeclarationAST *&node)
{
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    if (LA() != T_ASM)
        return false;

    AsmDefinitionAST *ast = new (_pool) AsmDefinitionAST;
    ast->asm_token = consumeToken();

    if (LA() == T_VOLATILE)
        ast->volatile_token = consumeToken();

    match(T_LPAREN, &ast->lparen_token);
    unsigned string_literal_token = 0;
    match(T_STRING_LITERAL, &string_literal_token);
    while (LA() == T_STRING_LITERAL) {
        consumeToken();
    }
    if (LA() == T_COLON) {
        consumeToken(); // skip T_COLON
        parseAsmOperandList();
        if (LA() == T_COLON) {
            consumeToken();
            parseAsmOperandList();
            if (LA() == T_COLON) {
                consumeToken();
                parseAsmClobberList();
            }
        } else if (LA() == T_COLON_COLON) {
            consumeToken();
            parseAsmClobberList();
        }
    } else if (LA() == T_COLON_COLON) {
        consumeToken();
        parseAsmClobberList();
    }
    match(T_RPAREN, &ast->rparen_token);
    match(T_SEMICOLON, &ast->semicolon_token);
    node = ast;
    return true;
}

bool Parser::parseAsmOperandList()
{
    if (parseAsmOperand()) {
        while (LA() == T_COMMA) {
            consumeToken();
            parseAsmOperand();
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        }
        return true;
    }
    return false;
}

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bool Parser::parseAsmOperand()
{
    unsigned string_literal_token = 0;
    match(T_STRING_LITERAL, &string_literal_token);

    if (LA() == T_LBRACKET) {
        /*unsigned lbracket_token = */ consumeToken();
        match(T_STRING_LITERAL, &string_literal_token);
        unsigned rbracket_token = 0;
        match(T_RBRACKET, &rbracket_token);
    }

    unsigned lparen_token = 0, rparen_token = 0;
    match(T_LPAREN, &lparen_token);
    ExpressionAST *expression = 0;
    parseExpression(expression);
    match(T_RPAREN, &rparen_token);
    return true;
}

bool Parser::parseAsmClobberList()
{
    if (LA() != T_STRING_LITERAL)
        return false;

    unsigned string_literal_token = consumeToken();

    while (LA() == T_COMMA) {
        consumeToken();
        match(T_STRING_LITERAL, &string_literal_token);
    }

    return true;
}

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bool Parser::parseTemplateDeclaration(DeclarationAST *&node)
{
    if (! (LA(1) == T_TEMPLATE || ((LA(1) == T_EXPORT || LA(1) == T_EXTERN)
            && LA(2) == T_TEMPLATE)))
        return false;

    TemplateDeclarationAST *ast = new (_pool) TemplateDeclarationAST;

    if (LA() == T_EXPORT || LA() == T_EXPORT)
        ast->export_token = consumeToken();

    ast->template_token = consumeToken();

    if (LA() == T_LESS) {
        ast->less_token = consumeToken();
        if (LA() == T_GREATER || parseTemplateParameterList(ast->template_parameters))
            match(T_GREATER, &ast->greater_token);
    }

    parseDeclaration(ast->declaration);
    node = ast;
    return true;
}

bool Parser::parseOperator(OperatorAST *&node) // ### FIXME
{
    OperatorAST *ast = new (_pool) OperatorAST;

    switch (LA()) {
    case T_NEW:
    case T_DELETE: {
        ast->op_token = consumeToken();
        if (LA() == T_LBRACKET) {
            ast->open_token = consumeToken();
            match(T_RBRACKET, &ast->close_token);
        }
    } break;

    case T_PLUS:
    case T_MINUS:
    case T_STAR:
    case T_SLASH:
    case T_PERCENT:
    case T_CARET:
    case T_AMPER:
    case T_PIPE:
    case T_TILDE:
    case T_EXCLAIM:
    case T_LESS:
    case T_GREATER:
    case T_COMMA:
    case T_AMPER_EQUAL:
    case T_CARET_EQUAL:
    case T_SLASH_EQUAL:
    case T_EQUAL:
    case T_EQUAL_EQUAL:
    case T_EXCLAIM_EQUAL:
    case T_GREATER_EQUAL:
    case T_GREATER_GREATER_EQUAL:
    case T_LESS_EQUAL:
    case T_LESS_LESS_EQUAL:
    case T_MINUS_EQUAL:
    case T_PERCENT_EQUAL:
    case T_PIPE_EQUAL:
    case T_PLUS_EQUAL:
    case T_STAR_EQUAL:
    case T_TILDE_EQUAL:
    case T_LESS_LESS:
    case T_GREATER_GREATER:
    case T_AMPER_AMPER:
    case T_PIPE_PIPE:
    case T_PLUS_PLUS:
    case T_MINUS_MINUS:
    case T_ARROW_STAR:
    case T_DOT_STAR:
    case T_ARROW:
        ast->op_token = consumeToken();
        break;

    default:
        if (LA() == T_LPAREN && LA(2) == T_RPAREN) {
            ast->op_token = ast->open_token = consumeToken();
            ast->close_token = consumeToken();
        } else if (LA() == T_LBRACKET && LA(2) == T_RBRACKET) {
            ast->op_token = ast->open_token = consumeToken();
            ast->close_token = consumeToken();
        } else {
            return false;
        }
    }

    node = ast;
    return true;
}

bool Parser::parseCvQualifiers(SpecifierAST *&node)
{
    unsigned start = cursor();
    SpecifierAST **ast = &node;
    while (*ast)
        ast = &(*ast)->next;

    while (int tk = LA()) {
        if (tk == T_CONST || tk == T_VOLATILE) {
            SimpleSpecifierAST *spec = new (_pool) SimpleSpecifierAST;
            spec->specifier_token = consumeToken();
            *ast = spec;
            ast = &(*ast)->next;
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        } else if(LA() == T___ATTRIBUTE__) {
            parseAttributeSpecifier(*ast);
            ast = &(*ast)->next;
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        } else {
            break;
        }
    }

    return start != cursor();
}

bool Parser::parsePtrOperator(PtrOperatorAST *&node)
{
    if (LA() == T_AMPER) {
        ReferenceAST *ast = new (_pool) ReferenceAST;
        ast->amp_token = consumeToken();
        node = ast;
        return true;
    } else if (LA() == T_STAR) {
        PointerAST *ast = new (_pool) PointerAST;
        ast->star_token = consumeToken();
        parseCvQualifiers(ast->cv_qualifier_seq);
        node = ast;
        return true;
    } else if (LA() == T_COLON_COLON || LA() == T_IDENTIFIER) {
        unsigned scope_or_identifier_token = cursor();

        unsigned global_scope_token = 0;
        if (LA() == T_COLON_COLON)
            global_scope_token = consumeToken();

        NestedNameSpecifierAST *nested_name_specifier = 0;
        bool has_nested_name_specifier = parseNestedNameSpecifier(
                nested_name_specifier, true);
        if (has_nested_name_specifier && LA() == T_STAR) {
            PointerToMemberAST *ast = new (_pool) PointerToMemberAST;
            ast->global_scope_token = global_scope_token;
            ast->nested_name_specifier = nested_name_specifier;
            ast->star_token = consumeToken();
            parseCvQualifiers(ast->cv_qualifier_seq);
            node = ast;
            return true;
        }
        rewind(scope_or_identifier_token);
    }
    return false;
}

bool Parser::parseTemplateArgument(ExpressionAST *&node)
{
    unsigned start = cursor();
    if (parseTypeId(node) && (LA() == T_COMMA || LA() == T_GREATER))
        return true;

    rewind(start);
    bool previousTemplateArguments = switchTemplateArguments(true);
    bool parsed = parseLogicalOrExpression(node);
    (void) switchTemplateArguments(previousTemplateArguments);
    return parsed;
}

bool Parser::parseDeclSpecifierSeq(SpecifierAST *&decl_specifier_seq,
                                   bool onlyTypeSpecifiers,
                                   bool simplified)
{
    bool has_type_specifier = false;
    NameAST *named_type_specifier = 0;
    SpecifierAST **decl_specifier_seq_ptr = &decl_specifier_seq;
    for (;;) {
        if (lookAtCVQualifier()) {
            SimpleSpecifierAST *spec = new (_pool) SimpleSpecifierAST;
            spec->specifier_token = consumeToken();
            *decl_specifier_seq_ptr = spec;
            decl_specifier_seq_ptr = &(*decl_specifier_seq_ptr)->next;
        } else if (! onlyTypeSpecifiers && lookAtStorageClassSpecifier()) {
            SimpleSpecifierAST *spec = new (_pool) SimpleSpecifierAST;
            spec->specifier_token = consumeToken();
            *decl_specifier_seq_ptr = spec;
            decl_specifier_seq_ptr = &(*decl_specifier_seq_ptr)->next;
        } else if (! named_type_specifier && lookAtBuiltinTypeSpecifier()) {
            parseBuiltinTypeSpecifier(*decl_specifier_seq_ptr);
            decl_specifier_seq_ptr = &(*decl_specifier_seq_ptr)->next;
            has_type_specifier = true;
        } else if (! has_type_specifier && (LA() == T_COLON_COLON ||
                                            LA() == T_IDENTIFIER)) {
            if (! parseName(named_type_specifier))
                return false;
            NamedTypeSpecifierAST *spec = new (_pool) NamedTypeSpecifierAST;
            spec->name = named_type_specifier;
            *decl_specifier_seq_ptr = spec;
            decl_specifier_seq_ptr = &(*decl_specifier_seq_ptr)->next;
            has_type_specifier = true;
        } else if (! simplified && ! has_type_specifier && (LA() == T_TYPENAME ||
                                                            LA() == T_ENUM     ||
                                                            lookAtClassKey())) {
            unsigned startOfElaboratedTypeSpecifier = cursor();
            if (! parseElaboratedTypeSpecifier(*decl_specifier_seq_ptr)) {
                _translationUnit->error(startOfElaboratedTypeSpecifier,
                                        "expected an elaborated type specifier");
                break;
            }
            decl_specifier_seq_ptr = &(*decl_specifier_seq_ptr)->next;
            has_type_specifier = true;
        } else
            break;
    }

    return decl_specifier_seq != 0;
}

bool Parser::parseDeclaratorOrAbstractDeclarator(DeclaratorAST *&node)
{
    unsigned start = cursor();
    bool blocked = blockErrors(true);
    if (parseDeclarator(node)) {
        blockErrors(blocked);
        return true;
    }
    blockErrors(blocked);
    rewind(start);
    return parseAbstractDeclarator(node);
}

bool Parser::parseCoreDeclarator(DeclaratorAST *&node)
{
    PtrOperatorAST *ptr_operators = 0, **ptr_operators_tail = &ptr_operators;
    while (parsePtrOperator(*ptr_operators_tail))
        ptr_operators_tail = &(*ptr_operators_tail)->next;

    if (LA() == T_COLON_COLON || LA() == T_IDENTIFIER || LA() == T_TILDE
            || LA() == T_OPERATOR) {
        NameAST *name = 0;
        if (parseName(name)) {
            DeclaratorIdAST *declarator_id = new (_pool) DeclaratorIdAST;
            declarator_id->name = name;
            DeclaratorAST *ast = new (_pool) DeclaratorAST;
            ast->ptr_operators = ptr_operators;
            ast->core_declarator = declarator_id;
            node = ast;
            return true;
        }
    } else if (LA() == T_LPAREN) {
        unsigned lparen_token = consumeToken();
        DeclaratorAST *declarator = 0;
        if (parseDeclarator(declarator) && LA() == T_RPAREN) {
            NestedDeclaratorAST *nested_declarator = new (_pool) NestedDeclaratorAST;
            nested_declarator->lparen_token = lparen_token;
            nested_declarator->declarator = declarator;
            nested_declarator->rparen_token = consumeToken();
            DeclaratorAST *ast = new (_pool) DeclaratorAST;
            ast->ptr_operators = ptr_operators;
            ast->core_declarator = nested_declarator;
            node = ast;
            return true;
        }
    }
    return false;
}

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bool Parser::parseDeclarator(DeclaratorAST *&node, bool stopAtCppInitializer)
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{
    if (! parseCoreDeclarator(node))
        return false;

    PostfixDeclaratorAST **postfix_ptr = &node->postfix_declarators;

    for (;;) {
        unsigned startOfPostDeclarator = cursor();

        if (LA() == T_LPAREN) {
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            if (stopAtCppInitializer) {
                unsigned lparen_token = cursor();
                ExpressionAST *initializer = 0;

                bool blocked = blockErrors(true);
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                if (parseInitializer(initializer, &node->equals_token)) {
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                    if (NestedExpressionAST *expr = initializer->asNestedExpression()) {
                        if (expr->expression && expr->rparen_token && (LA() == T_COMMA || LA() == T_SEMICOLON)) {
                            rewind(lparen_token);