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<div class="title">scope_chain.cpp</div> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * This file is part of the KDE libraries</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 2003 Apple Computer, Inc.</span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
<a name="l00006"></a>00006 <span class="comment"> * modify it under the terms of the GNU Library General Public</span>
<a name="l00007"></a>00007 <span class="comment"> * License as published by the Free Software Foundation; either</span>
<a name="l00008"></a>00008 <span class="comment"> * version 2 of the License, or (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * This library is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00013"></a>00013 <span class="comment"> * Library General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"> *</span>
<a name="l00015"></a>00015 <span class="comment"> * You should have received a copy of the GNU Library General Public License</span>
<a name="l00016"></a>00016 <span class="comment"> * along with this library; see the file COPYING.LIB. If not, write to</span>
<a name="l00017"></a>00017 <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="l00018"></a>00018 <span class="comment"> * Boston, MA 02110-1301, USA.</span>
<a name="l00019"></a>00019 <span class="comment"> *</span>
<a name="l00020"></a>00020 <span class="comment"> */</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#include "scope_chain.h"</span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="preprocessor">#include "object.h"</span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="preprocessor">#include <assert.h></span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="keyword">namespace </span>KJS {
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keyword">inline</span> <span class="keywordtype">void</span> ScopeChain::ref()<span class="keyword"> const</span>
<a name="l00031"></a>00031 <span class="keyword"></span>{
<a name="l00032"></a>00032 <span class="keywordflow">for</span> (ScopeChainNode *n = _node; n; n = n->next) {
<a name="l00033"></a>00033 <span class="keywordflow">if</span> (n->refCount++ != 0)
<a name="l00034"></a>00034 <span class="keywordflow">break</span>;
<a name="l00035"></a>00035 }
<a name="l00036"></a>00036 }
<a name="l00037"></a>00037
<a name="l00038"></a>00038 ScopeChain &ScopeChain::operator=(<span class="keyword">const</span> ScopeChain &c)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040 c.ref();
<a name="l00041"></a>00041 deref();
<a name="l00042"></a>00042 _node = c._node;
<a name="l00043"></a>00043 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00044"></a>00044 }
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="keywordtype">void</span> ScopeChain::push(ObjectImp *o)
<a name="l00047"></a>00047 {
<a name="l00048"></a>00048 assert(o);
<a name="l00049"></a>00049 _node = <span class="keyword">new</span> ScopeChainNode(_node, o);
<a name="l00050"></a>00050 }
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="keywordtype">void</span> ScopeChain::pop()
<a name="l00053"></a>00053 {
<a name="l00054"></a>00054 ScopeChainNode *oldNode = _node;
<a name="l00055"></a>00055 assert(oldNode);
<a name="l00056"></a>00056 ScopeChainNode *newNode = oldNode->next;
<a name="l00057"></a>00057 _node = newNode;
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="keywordflow">if</span> (--oldNode->refCount != 0) {
<a name="l00060"></a>00060 <span class="keywordflow">if</span> (newNode)
<a name="l00061"></a>00061 ++newNode->refCount;
<a name="l00062"></a>00062 } <span class="keywordflow">else</span> {
<a name="l00063"></a>00063 <span class="keyword">delete</span> oldNode;
<a name="l00064"></a>00064 }
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="keywordtype">void</span> ScopeChain::release()
<a name="l00068"></a>00068 {
<a name="l00069"></a>00069 <span class="comment">// This function is only called by deref(),</span>
<a name="l00070"></a>00070 <span class="comment">// Deref ensures these conditions are true.</span>
<a name="l00071"></a>00071 assert(_node && _node->refCount == 0);
<a name="l00072"></a>00072 ScopeChainNode *n = _node;
<a name="l00073"></a>00073 <span class="keywordflow">do</span> {
<a name="l00074"></a>00074 ScopeChainNode *<a class="codeRef" doxygen="kdecore.tag:../../kdecore/html/" href="../../kdecore/html/namespaceKStdAccel.html#a3c93cec83afd9c54d443fe78a9899502">next</a> = n->next;
<a name="l00075"></a>00075 <span class="keyword">delete</span> n;
<a name="l00076"></a>00076 n = next;
<a name="l00077"></a>00077 } <span class="keywordflow">while</span> (n && --n->refCount == 0);
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="keywordtype">void</span> ScopeChain::mark()
<a name="l00081"></a>00081 {
<a name="l00082"></a>00082 <span class="keywordflow">for</span> (ScopeChainNode *n = _node; n; n = n->next) {
<a name="l00083"></a>00083 ObjectImp *o = n->object;
<a name="l00084"></a>00084 <span class="keywordflow">if</span> (!o->marked())
<a name="l00085"></a>00085 o->mark();
<a name="l00086"></a>00086 }
<a name="l00087"></a>00087 }
<a name="l00088"></a>00088
<a name="l00089"></a>00089 } <span class="comment">// namespace KJS</span>
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