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/*
* Copyright (C) 2003, 2008, 2009 Apple Inc. All rights reserved.
*
* 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 ScopeChain_h
#define ScopeChain_h
#include "JSCell.h"
#include "Structure.h"
#include <wtf/FastAllocBase.h>
namespace JSC {
class JSGlobalData;
class JSGlobalObject;
class JSObject;
class LLIntOffsetsExtractor;
class ScopeChainIterator;
class SlotVisitor;
class ScopeChainNode : public JSCell {
private:
ScopeChainNode(ScopeChainNode* next, JSObject* object, JSGlobalData* globalData, JSGlobalObject* globalObject, JSObject* globalThis)
: JSCell(*globalData, globalData->scopeChainNodeStructure.get())
, globalData(globalData)
, next(*globalData, this, next, WriteBarrier<ScopeChainNode>::MayBeNull)
, object(*globalData, this, object)
, globalObject(*globalData, this, globalObject)
, globalThis(*globalData, this, globalThis)
{
}
protected:
void finishCreation(JSGlobalData* globalData, JSGlobalObject* globalObject)
{
Base::finishCreation(*globalData);
ASSERT_UNUSED(globalObject, globalObject);
}
public:
typedef JSCell Base;
static ScopeChainNode* create(ExecState* exec, ScopeChainNode* next, JSObject* object, JSGlobalData* globalData, JSGlobalObject* globalObject, JSObject* globalThis)
{
ScopeChainNode* node = new (NotNull, allocateCell<ScopeChainNode>(*exec->heap())) ScopeChainNode(next, object, globalData, globalObject, globalThis);
node->finishCreation(globalData, globalObject);
return node;
}
static ScopeChainNode* create(ScopeChainNode* next, JSObject* object, JSGlobalData* globalData, JSGlobalObject* globalObject, JSObject* globalThis)
{
ScopeChainNode* node = new (NotNull, allocateCell<ScopeChainNode>(globalData->heap)) ScopeChainNode(next, object, globalData, globalObject, globalThis);
node->finishCreation(globalData, globalObject);
return node;
}
JSGlobalData* globalData;
WriteBarrier<ScopeChainNode> next;
WriteBarrier<JSObject> object;
WriteBarrier<JSGlobalObject> globalObject;
WriteBarrier<JSObject> globalThis;
ScopeChainNode* push(JSObject*);
ScopeChainNode* pop();
ScopeChainIterator begin();
ScopeChainIterator end();
int localDepth();
#ifndef NDEBUG
void print();
#endif
static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(globalData, globalObject, proto, TypeInfo(CompoundType, StructureFlags), &s_info); }
static void visitChildren(JSCell*, SlotVisitor&);
static JS_EXPORTDATA const ClassInfo s_info;
private:
friend class LLIntOffsetsExtractor;
static const unsigned StructureFlags = OverridesVisitChildren;
};
inline ScopeChainNode* ScopeChainNode::push(JSObject* o)
{
ASSERT(o);
return ScopeChainNode::create(this, o, globalData, globalObject.get(), globalThis.get());
}
inline ScopeChainNode* ScopeChainNode::pop()
{
ASSERT(next);
return next.get();
}
class ScopeChainIterator {
public:
ScopeChainIterator(ScopeChainNode* node)
: m_node(node)
{
}
WriteBarrier<JSObject> const & operator*() const { return m_node->object; }
WriteBarrier<JSObject> const * operator->() const { return &(operator*()); }
ScopeChainIterator& operator++() { m_node = m_node->next.get(); 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;
};
inline ScopeChainIterator ScopeChainNode::begin()
{
return ScopeChainIterator(this);
}
inline ScopeChainIterator ScopeChainNode::end()
{
return ScopeChainIterator(0);
}
ALWAYS_INLINE JSGlobalData& ExecState::globalData() const
{
ASSERT(scopeChain()->globalData);
return *scopeChain()->globalData;
}
ALWAYS_INLINE JSGlobalObject* ExecState::lexicalGlobalObject() const
{
return scopeChain()->globalObject.get();
}
ALWAYS_INLINE JSObject* ExecState::globalThisValue() const
{
return scopeChain()->globalThis.get();
}
ALWAYS_INLINE ScopeChainNode* Register::scopeChain() const
{
return static_cast<ScopeChainNode*>(jsValue().asCell());
}
ALWAYS_INLINE Register& Register::operator=(ScopeChainNode* scopeChain)
{
*this = JSValue(scopeChain);
return *this;
}
} // namespace JSC
#endif // ScopeChain_h
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