source: webkit/trunk/JavaScriptCore/kjs/context.h@ 13597

// -*- c-basic-offset: 2 -*-
/*
 *  This file is part of the KDE libraries
 *  Copyright (C) 1999-2001 Harri Porten ([email protected])
 *  Copyright (C) 2001 Peter Kelly ([email protected])
 *  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., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#ifndef KJS_CONTEXT_H
#define KJS_CONTEXT_H

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

namespace KJS  {

  /**
   * @short Execution context.
   */
  class ContextImp {
  public:
    ContextImp(JSObject* global, InterpreterImp*, JSObject* thisV, FunctionBodyNode* currentBody,
               CodeType type = GlobalCode, ContextImp* callingContext = 0, FunctionImp* function = 0, const List* args = 0);
    ~ContextImp();

    FunctionBodyNode* currentBody() { return m_currentBody; }

    const ScopeChain &scopeChain() const { return scope; }
    CodeType codeType() { return m_codeType; }
    JSObject *variableObject() const { return variable; }
    void setVariableObject(JSObject *v) { variable = v; }
    JSObject *thisValue() const { return thisVal; }
    ContextImp *callingContext() { return _callingContext; }
    JSObject *activationObject() { return activation; }
    FunctionImp *function() const { return _function; }
    const List *arguments() const { return _arguments; }

    void pushScope(JSObject *s) { scope.push(s); }
    void popScope() { scope.pop(); }
    LabelStack *seenLabels() { return &ls; }


    void pushIteration() { m_iterationDepth++; }
    void popIteration() { m_iterationDepth--; }
    bool inIteration() const { return (m_iterationDepth > 0); }
    
    void pushSwitch() { m_switchDepth++; }
    void popSwitch() { m_switchDepth--; }
    bool inSwitch() const { return (m_switchDepth > 0); }
        
    void mark();

  private:
    InterpreterImp *_interpreter;
    ContextImp *_callingContext;
    FunctionBodyNode* m_currentBody;

    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!
    JSObject *activation;
    
    ScopeChain scope;
    JSObject *variable;
    JSObject *thisVal;

    LabelStack ls;
    int m_iterationDepth;
    int m_switchDepth;
    CodeType m_codeType;
  };

} // namespace KJS

#endif