Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 169 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/ScopeChain.h b/Source/JavaScriptCore/runtime/ScopeChain.h
new file mode 100644
index 000000000..6e358d779
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+++ b/Source/JavaScriptCore/runtime/ScopeChain.h
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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 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:
+        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