--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/JavaScriptCore/kjs/scope_chain.h Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,146 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef KJS_SCOPE_CHAIN_H
+#define KJS_SCOPE_CHAIN_H
+
+#include <assert.h>
+
+namespace KJS {
+
+ class JSObject;
+ class ExecState;
+
+ class ScopeChainNode {
+ public:
+ ScopeChainNode(ScopeChainNode *n, JSObject *o)
+ : next(n), object(o), refCount(1) { }
+
+ ScopeChainNode *next;
+ JSObject *object;
+ int refCount;
+ };
+
+ class ScopeChainIterator {
+ public:
+ ScopeChainIterator(ScopeChainNode *node) : m_node(node) {}
+
+ JSObject * const & operator*() const { return m_node->object; }
+ JSObject * const * operator->() const { return &(operator*()); }
+
+ ScopeChainIterator& operator++() { m_node = m_node->next; return *this; }
+
+ // postfix ++ intentionally omitted
+
+ bool operator==(const ScopeChainIterator& other) const { return m_node == other.m_node; }
+ bool operator!=(const ScopeChainIterator& other) const { return m_node != other.m_node; }
+
+ private:
+ ScopeChainNode *m_node;
+ };
+
+ class ScopeChain {
+ public:
+ ScopeChain() : _node(0) { }
+ ~ScopeChain() { deref(); }
+
+ ScopeChain(const ScopeChain &c) : _node(c._node)
+ { if (_node) ++_node->refCount; }
+ ScopeChain &operator=(const ScopeChain &);
+
+ bool isEmpty() const { return !_node; }
+ JSObject *top() const { return _node->object; }
+
+ JSObject *bottom() const;
+
+ ScopeChainIterator begin() const { return ScopeChainIterator(_node); }
+ ScopeChainIterator end() const { return ScopeChainIterator(0); }
+
+ void clear() { deref(); _node = 0; }
+ void push(JSObject *);
+ void push(const ScopeChain &);
+ void pop();
+
+ void mark();
+
+#ifndef NDEBUG
+ void print();
+#endif
+
+ private:
+ ScopeChainNode *_node;
+
+ void deref() { if (_node && --_node->refCount == 0) release(); }
+ void ref() const;
+
+ void release();
+ };
+
+inline void ScopeChain::ref() const
+{
+ for (ScopeChainNode *n = _node; n; n = n->next) {
+ if (n->refCount++ != 0)
+ break;
+ }
+}
+
+inline ScopeChain &ScopeChain::operator=(const ScopeChain &c)
+{
+ c.ref();
+ deref();
+ _node = c._node;
+ return *this;
+}
+
+inline JSObject *ScopeChain::bottom() const
+{
+ ScopeChainNode *last = 0;
+ for (ScopeChainNode *n = _node; n; n = n->next)
+ last = n;
+ if (!last)
+ return 0;
+ return last->object;
+}
+
+inline void ScopeChain::push(JSObject *o)
+{
+ assert(o);
+ _node = new ScopeChainNode(_node, o);
+}
+
+inline 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;
+ }
+}
+
+} // namespace KJS
+
+#endif // KJS_SCOPE_CHAIN_H