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/*
* This file is part of the KDE libraries
* 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.
*
*/
#include "scope_chain.h"
#include "object.h"
#include <assert.h>
namespace KJS {
inline void ScopeChain::ref() const
{
for (ScopeChainNode *n = _node; n; n = n->next) {
if (n->refCount++ != 0)
break;
}
}
ScopeChain &ScopeChain::operator=(const ScopeChain &c)
{
c.ref();
deref();
_node = c._node;
return *this;
}
void ScopeChain::push(ObjectImp *o)
{
assert(o);
_node = new ScopeChainNode(_node, o);
}
void ScopeChain::pop()
{
ScopeChainNode *oldNode = _node;
assert(oldNode);
ScopeChainNode *newNode = oldNode->next;
_node = newNode;
if (--oldNode->refCount != 0) {
if (newNode)
++newNode->refCount;
} else {
delete oldNode;
}
}
void ScopeChain::release()
{
// This function is only called by deref(),
// Deref ensures these conditions are true.
assert(_node && _node->refCount == 0);
ScopeChainNode *n = _node;
do {
ScopeChainNode *next = n->next;
delete n;
n = next;
} while (n && --n->refCount == 0);
}
void ScopeChain::mark()
{
for (ScopeChainNode *n = _node; n; n = n->next) {
ObjectImp *o = n->object;
if (!o->marked())
o->mark();
}
}
} // namespace KJS
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