context.h   [plain text]

// -*- c-basic-offset: 2 -*-
/*
 *  This file is part of the KDE libraries
 *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
 *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
 *  Copyright (C) 2003 Apple Computer, Inc.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *  Boston, MA 02111-1307, USA.
 *
 */

#ifndef KJS_CONTEXT_H
#define KJS_CONTEXT_H

#include "function.h"
#include "protect.h"

namespace KJS  {

  /**
   * @short Execution context.
   */
  class ContextImp {
  public:
    ContextImp(Object &glob, InterpreterImp *, Object &thisV, CodeType type = GlobalCode,
               ContextImp *callingContext = 0, FunctionImp *functiion = 0, const List *args = 0);
    ~ContextImp();

    const ScopeChain &scopeChain() const { return scope; }
    Object variableObject() const { return variable; }
    void setVariableObject(const Object &v) { variable = v; }
    Object thisValue() const { return thisVal; }
    ContextImp *callingContext() { return _callingContext; }
    ObjectImp *activationObject() { return activation.imp(); }
    FunctionImp *function() const { return _function; }
    const List *arguments() const { return _arguments; }

    void pushScope(const Object &s) { scope.push(s.imp()); }
    void popScope() { scope.pop(); }
    LabelStack *seenLabels() { return &ls; }
    
    void mark();

  private:
    InterpreterImp *_interpreter;
    ContextImp *_callingContext;
    FunctionImp *_function;
    const List *_arguments;
    // because ContextImp is always allocated on the stack,
    // there is no need to protect various pointers from conservative
    // GC since they will be caught by the conservative sweep anyway!
    Object activation;
    
    ScopeChain scope;
    Object variable;
    Object thisVal;

    LabelStack ls;
    CodeType codeType;
  };

} // namespace KJS

#endif