Source/JavaScriptCore/runtime/ScopeChain.cpp

/*
 *  Copyright (C) 2003, 2006, 2008 Apple 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.
 *
 */

#include "config.h"
#include "ScopeChain.h"

#include "JSActivation.h"
#include "JSGlobalObject.h"
#include "JSObject.h"
#include "PropertyNameArray.h"
#include <stdio.h>

namespace JSC {

ASSERT_HAS_TRIVIAL_DESTRUCTOR(ScopeChainNode);

#ifndef NDEBUG

void ScopeChainNode::print()
{
    ScopeChainIterator scopeEnd = end();
    for (ScopeChainIterator scopeIter = begin(); scopeIter != scopeEnd; ++scopeIter) {
        JSObject* o = scopeIter.get();
        PropertyNameArray propertyNames(globalObject->globalExec());
        o->methodTable()->getPropertyNames(o, globalObject->globalExec(), propertyNames, ExcludeDontEnumProperties);
        PropertyNameArray::const_iterator propEnd = propertyNames.end();

        dataLog("----- [scope %p] -----\n", o);
        for (PropertyNameArray::const_iterator propIter = propertyNames.begin(); propIter != propEnd; propIter++) {
            Identifier name = *propIter;
            dataLog("%s, ", name.ustring().utf8().data());
        }
        dataLog("\n");
    }
}

#endif

const ClassInfo ScopeChainNode::s_info = { "ScopeChainNode", 0, 0, 0, CREATE_METHOD_TABLE(ScopeChainNode) };

int ScopeChainNode::localDepth()
{
    int scopeDepth = 0;
    ScopeChainIterator iter = this->begin();
    ScopeChainIterator end = this->end();
    while (!iter->inherits(&JSActivation::s_info)) {
        ++iter;
        if (iter == end)
            break;
        ++scopeDepth;
    }
    return scopeDepth;
}

void ScopeChainNode::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
    ScopeChainNode* thisObject = jsCast<ScopeChainNode*>(cell);
    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());

    visitor.append(&thisObject->next);
    visitor.append(&thisObject->object);
    visitor.append(&thisObject->globalObject);
    visitor.append(&thisObject->globalThis);
}

} // namespace JSC