X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/b5422865f473faf3977f31b96a635c4c8c4ede09..9dae56ea45a0f5f8136a5c93d6f3a7f99399ca73:/parser/Nodes.cpp

diff --git a/parser/Nodes.cpp b/parser/Nodes.cpp
new file mode 100644
index 0000000..8aa1788
--- /dev/null
+++ b/parser/Nodes.cpp
@@ -0,0 +1,2750 @@
+/*
+*  Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
+*  Copyright (C) 2001 Peter Kelly (pmk@post.com)
+*  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+*  Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
+*  Copyright (C) 2007 Maks Orlovich
+*  Copyright (C) 2007 Eric Seidel <eric@webkit.org>
+*
+*  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 "config.h"
+#include "Nodes.h"
+
+#include "BytecodeGenerator.h"
+#include "CallFrame.h"
+#include "JSGlobalObject.h"
+#include "JSStaticScopeObject.h"
+#include "LabelScope.h"
+#include "Parser.h"
+#include "PropertyNameArray.h"
+#include "RegExpObject.h"
+#include "SamplingTool.h"
+#include "Debugger.h"
+#include "Lexer.h"
+#include "Operations.h"
+#include <math.h>
+#include <wtf/Assertions.h>
+#include <wtf/HashCountedSet.h>
+#include <wtf/HashSet.h>
+#include <wtf/MathExtras.h>
+#include <wtf/RefCountedLeakCounter.h>
+#include <wtf/Threading.h>
+
+using namespace WTF;
+
+namespace JSC {
+
+static void substitute(UString& string, const UString& substring) JSC_FAST_CALL;
+
+// ------------------------------ NodeReleaser --------------------------------
+
+class NodeReleaser : Noncopyable {
+public:
+    // Call this function inside the destructor of a class derived from Node.
+    // This will traverse the tree below this node, destroying all of those nodes,
+    // but without relying on recursion.
+    static void releaseAllNodes(ParserRefCounted* root);
+
+    // Call this on each node in a the releaseNodes virtual function.
+    // It gives the node to the NodeReleaser, which will then release the
+    // node later at the end of the releaseAllNodes process.
+    template <typename T> void release(RefPtr<T>& node) { if (node) adopt(node.release()); }
+    void release(RefPtr<FunctionBodyNode>& node) { if (node) adoptFunctionBodyNode(node); }
+
+private:
+    NodeReleaser() { }
+    ~NodeReleaser() { }
+
+    void adopt(PassRefPtr<ParserRefCounted>);
+    void adoptFunctionBodyNode(RefPtr<FunctionBodyNode>&);
+
+    typedef Vector<RefPtr<ParserRefCounted> > NodeReleaseVector;
+    OwnPtr<NodeReleaseVector> m_vector;
+};
+
+void NodeReleaser::releaseAllNodes(ParserRefCounted* root)
+{
+    ASSERT(root);
+    NodeReleaser releaser;
+    root->releaseNodes(releaser);
+    if (!releaser.m_vector)
+        return;
+    // Note: The call to release.m_vector->size() is intentionally inside
+    // the loop, since calls to releaseNodes are expected to increase the size.
+    for (size_t i = 0; i < releaser.m_vector->size(); ++i) {
+        ParserRefCounted* node = (*releaser.m_vector)[i].get();
+        if (node->hasOneRef())
+            node->releaseNodes(releaser);
+    }
+}
+
+void NodeReleaser::adopt(PassRefPtr<ParserRefCounted> node)
+{
+    ASSERT(node);
+    if (!node->hasOneRef())
+        return;
+    if (!m_vector)
+        m_vector.set(new NodeReleaseVector);
+    m_vector->append(node);
+}
+
+void NodeReleaser::adoptFunctionBodyNode(RefPtr<FunctionBodyNode>& functionBodyNode)
+{
+    // This sidesteps a problem where if you assign a PassRefPtr<FunctionBodyNode>
+    // to a PassRefPtr<Node> we leave the two reference counts (FunctionBodyNode
+    // and ParserRefCounted) unbalanced. It would be nice to fix this problem in
+    // a cleaner way -- perhaps we could remove the FunctionBodyNode reference
+    // count at some point.
+    RefPtr<Node> node = functionBodyNode;
+    functionBodyNode = 0;
+    adopt(node.release());
+}
+
+// ------------------------------ ParserRefCounted -----------------------------------------
+
+#ifndef NDEBUG
+static RefCountedLeakCounter parserRefCountedCounter("JSC::Node");
+#endif
+
+ParserRefCounted::ParserRefCounted(JSGlobalData* globalData)
+    : m_globalData(globalData)
+{
+#ifndef NDEBUG
+    parserRefCountedCounter.increment();
+#endif
+    if (!m_globalData->newParserObjects)
+        m_globalData->newParserObjects = new HashSet<ParserRefCounted*>;
+    m_globalData->newParserObjects->add(this);
+    ASSERT(m_globalData->newParserObjects->contains(this));
+}
+
+ParserRefCounted::~ParserRefCounted()
+{
+#ifndef NDEBUG
+    parserRefCountedCounter.decrement();
+#endif
+}
+
+void ParserRefCounted::releaseNodes(NodeReleaser&)
+{
+}
+
+void ParserRefCounted::ref()
+{
+    // bumping from 0 to 1 is just removing from the new nodes set
+    if (m_globalData->newParserObjects) {
+        HashSet<ParserRefCounted*>::iterator it = m_globalData->newParserObjects->find(this);
+        if (it != m_globalData->newParserObjects->end()) {
+            m_globalData->newParserObjects->remove(it);
+            ASSERT(!m_globalData->parserObjectExtraRefCounts || !m_globalData->parserObjectExtraRefCounts->contains(this));
+            return;
+        }
+    }
+
+    ASSERT(!m_globalData->newParserObjects || !m_globalData->newParserObjects->contains(this));
+
+    if (!m_globalData->parserObjectExtraRefCounts)
+        m_globalData->parserObjectExtraRefCounts = new HashCountedSet<ParserRefCounted*>;
+    m_globalData->parserObjectExtraRefCounts->add(this);
+}
+
+void ParserRefCounted::deref()
+{
+    ASSERT(!m_globalData->newParserObjects || !m_globalData->newParserObjects->contains(this));
+
+    if (!m_globalData->parserObjectExtraRefCounts) {
+        delete this;
+        return;
+    }
+
+    HashCountedSet<ParserRefCounted*>::iterator it = m_globalData->parserObjectExtraRefCounts->find(this);
+    if (it == m_globalData->parserObjectExtraRefCounts->end())
+        delete this;
+    else
+        m_globalData->parserObjectExtraRefCounts->remove(it);
+}
+
+bool ParserRefCounted::hasOneRef()
+{
+    if (m_globalData->newParserObjects && m_globalData->newParserObjects->contains(this)) {
+        ASSERT(!m_globalData->parserObjectExtraRefCounts || !m_globalData->parserObjectExtraRefCounts->contains(this));
+        return false;
+    }
+
+    ASSERT(!m_globalData->newParserObjects || !m_globalData->newParserObjects->contains(this));
+
+    if (!m_globalData->parserObjectExtraRefCounts)
+        return true;
+
+    return !m_globalData->parserObjectExtraRefCounts->contains(this);
+}
+
+void ParserRefCounted::deleteNewObjects(JSGlobalData* globalData)
+{
+    if (!globalData->newParserObjects)
+        return;
+
+#ifndef NDEBUG
+    HashSet<ParserRefCounted*>::iterator end = globalData->newParserObjects->end();
+    for (HashSet<ParserRefCounted*>::iterator it = globalData->newParserObjects->begin(); it != end; ++it)
+        ASSERT(!globalData->parserObjectExtraRefCounts || !globalData->parserObjectExtraRefCounts->contains(*it));
+#endif
+    deleteAllValues(*globalData->newParserObjects);
+    delete globalData->newParserObjects;
+    globalData->newParserObjects = 0;
+}
+
+// ------------------------------ Node --------------------------------
+
+Node::Node(JSGlobalData* globalData)
+    : ParserRefCounted(globalData)
+{
+    m_line = globalData->lexer->lineNo();
+}
+
+// ------------------------------ ThrowableExpressionData --------------------------------
+
+static void substitute(UString& string, const UString& substring)
+{
+    int position = string.find("%s");
+    ASSERT(position != -1);
+    UString newString = string.substr(0, position);
+    newString.append(substring);
+    newString.append(string.substr(position + 2));
+    string = newString;
+}
+
+RegisterID* ThrowableExpressionData::emitThrowError(BytecodeGenerator& generator, ErrorType e, const char* msg)
+{
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    RegisterID* exception = generator.emitNewError(generator.newTemporary(), e, jsString(generator.globalData(), msg));
+    generator.emitThrow(exception);
+    return exception;
+}
+
+RegisterID* ThrowableExpressionData::emitThrowError(BytecodeGenerator& generator, ErrorType e, const char* msg, const Identifier& label)
+{
+    UString message = msg;
+    substitute(message, label.ustring());
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    RegisterID* exception = generator.emitNewError(generator.newTemporary(), e, jsString(generator.globalData(), message));
+    generator.emitThrow(exception);
+    return exception;
+}
+    
+// ------------------------------ StatementNode --------------------------------
+
+StatementNode::StatementNode(JSGlobalData* globalData)
+    : Node(globalData)
+    , m_lastLine(-1)
+{
+}
+
+void StatementNode::setLoc(int firstLine, int lastLine)
+{
+    m_line = firstLine;
+    m_lastLine = lastLine;
+}
+
+// ------------------------------ SourceElements --------------------------------
+
+void SourceElements::append(PassRefPtr<StatementNode> statement)
+{
+    if (statement->isEmptyStatement())
+        return;
+
+    m_statements.append(statement);
+}
+
+// ------------------------------ NullNode -------------------------------------
+
+RegisterID* NullNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult())
+        return 0;
+    return generator.emitLoad(dst, jsNull());
+}
+
+// ------------------------------ BooleanNode ----------------------------------
+
+RegisterID* BooleanNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult())
+        return 0;
+    return generator.emitLoad(dst, m_value);
+}
+
+// ------------------------------ NumberNode -----------------------------------
+
+RegisterID* NumberNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult())
+        return 0;
+    return generator.emitLoad(dst, m_double);
+}
+
+// ------------------------------ StringNode -----------------------------------
+
+RegisterID* StringNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult())
+        return 0;
+    return generator.emitLoad(dst, m_value);
+}
+
+// ------------------------------ RegExpNode -----------------------------------
+
+RegisterID* RegExpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegExp> regExp = RegExp::create(generator.globalData(), m_pattern, m_flags);
+    if (!regExp->isValid())
+        return emitThrowError(generator, SyntaxError, ("Invalid regular expression: " + UString(regExp->errorMessage())).UTF8String().c_str());
+    if (dst == generator.ignoredResult())
+        return 0;
+    return generator.emitNewRegExp(generator.finalDestination(dst), regExp.get());
+}
+
+// ------------------------------ ThisNode -------------------------------------
+
+RegisterID* ThisNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult())
+        return 0;
+    return generator.moveToDestinationIfNeeded(dst, generator.thisRegister());
+}
+
+// ------------------------------ ResolveNode ----------------------------------
+
+bool ResolveNode::isPure(BytecodeGenerator& generator) const
+{
+    return generator.isLocal(m_ident);
+}
+
+RegisterID* ResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (RegisterID* local = generator.registerFor(m_ident)) {
+        if (dst == generator.ignoredResult())
+            return 0;
+        return generator.moveToDestinationIfNeeded(dst, local);
+    }
+    
+    generator.emitExpressionInfo(m_startOffset + m_ident.size(), m_ident.size(), 0);
+    return generator.emitResolve(generator.finalDestination(dst), m_ident);
+}
+
+// ------------------------------ ElementNode ------------------------------------
+
+ElementNode::~ElementNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ElementNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_next);
+    releaser.release(m_node);
+}
+
+// ------------------------------ ArrayNode ------------------------------------
+
+ArrayNode::~ArrayNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ArrayNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_element);
+}
+
+RegisterID* ArrayNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    // FIXME: Should we put all of this code into emitNewArray?
+
+    unsigned length = 0;
+    ElementNode* firstPutElement;
+    for (firstPutElement = m_element.get(); firstPutElement; firstPutElement = firstPutElement->next()) {
+        if (firstPutElement->elision())
+            break;
+        ++length;
+    }
+
+    if (!firstPutElement && !m_elision)
+        return generator.emitNewArray(generator.finalDestination(dst), m_element.get());
+
+    RefPtr<RegisterID> array = generator.emitNewArray(generator.tempDestination(dst), m_element.get());
+
+    for (ElementNode* n = firstPutElement; n; n = n->next()) {
+        RegisterID* value = generator.emitNode(n->value());
+        length += n->elision();
+        generator.emitPutByIndex(array.get(), length++, value);
+    }
+
+    if (m_elision) {
+        RegisterID* value = generator.emitLoad(0, jsNumber(generator.globalData(), m_elision + length));
+        generator.emitPutById(array.get(), generator.propertyNames().length, value);
+    }
+
+    return generator.moveToDestinationIfNeeded(dst, array.get());
+}
+
+// ------------------------------ PropertyNode ----------------------------
+
+PropertyNode::~PropertyNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void PropertyNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_assign);
+}
+
+// ------------------------------ ObjectLiteralNode ----------------------------
+
+ObjectLiteralNode::~ObjectLiteralNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ObjectLiteralNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_list);
+}
+
+RegisterID* ObjectLiteralNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+     if (!m_list) {
+         if (dst == generator.ignoredResult())
+             return 0;
+         return generator.emitNewObject(generator.finalDestination(dst));
+     }
+     return generator.emitNode(dst, m_list.get());
+}
+
+// ------------------------------ PropertyListNode -----------------------------
+
+PropertyListNode::~PropertyListNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void PropertyListNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_node);
+    releaser.release(m_next);
+}
+
+RegisterID* PropertyListNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> newObj = generator.tempDestination(dst);
+    
+    generator.emitNewObject(newObj.get());
+    
+    for (PropertyListNode* p = this; p; p = p->m_next.get()) {
+        RegisterID* value = generator.emitNode(p->m_node->m_assign.get());
+        
+        switch (p->m_node->m_type) {
+            case PropertyNode::Constant: {
+                generator.emitPutById(newObj.get(), p->m_node->name(), value);
+                break;
+            }
+            case PropertyNode::Getter: {
+                generator.emitPutGetter(newObj.get(), p->m_node->name(), value);
+                break;
+            }
+            case PropertyNode::Setter: {
+                generator.emitPutSetter(newObj.get(), p->m_node->name(), value);
+                break;
+            }
+            default:
+                ASSERT_NOT_REACHED();
+        }
+    }
+    
+    return generator.moveToDestinationIfNeeded(dst, newObj.get());
+}
+
+// ------------------------------ BracketAccessorNode --------------------------------
+
+BracketAccessorNode::~BracketAccessorNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void BracketAccessorNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_subscript);
+}
+
+RegisterID* BracketAccessorNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base.get(), m_subscriptHasAssignments, m_subscript->isPure(generator));
+    RegisterID* property = generator.emitNode(m_subscript.get());
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    return generator.emitGetByVal(generator.finalDestination(dst), base.get(), property);
+}
+
+// ------------------------------ DotAccessorNode --------------------------------
+
+DotAccessorNode::~DotAccessorNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void DotAccessorNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+}
+
+RegisterID* DotAccessorNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RegisterID* base = generator.emitNode(m_base.get());
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    return generator.emitGetById(generator.finalDestination(dst), base, m_ident);
+}
+
+// ------------------------------ ArgumentListNode -----------------------------
+
+ArgumentListNode::~ArgumentListNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ArgumentListNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_next);
+    releaser.release(m_expr);
+}
+
+RegisterID* ArgumentListNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    ASSERT(m_expr);
+    return generator.emitNode(dst, m_expr.get());
+}
+
+// ------------------------------ ArgumentsNode -----------------------------
+
+ArgumentsNode::~ArgumentsNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ArgumentsNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_listNode);
+}
+
+// ------------------------------ NewExprNode ----------------------------------
+
+NewExprNode::~NewExprNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void NewExprNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+    releaser.release(m_args);
+}
+
+RegisterID* NewExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> func = generator.emitNode(m_expr.get());
+    return generator.emitConstruct(generator.finalDestination(dst), func.get(), m_args.get(), divot(), startOffset(), endOffset());
+}
+
+// ------------------------------ EvalFunctionCallNode ----------------------------------
+
+EvalFunctionCallNode::~EvalFunctionCallNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void EvalFunctionCallNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_args);
+}
+
+RegisterID* EvalFunctionCallNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> func = generator.tempDestination(dst);
+    RefPtr<RegisterID> thisRegister = generator.newTemporary();
+    generator.emitExpressionInfo(divot() - startOffset() + 4, 4, 0);
+    generator.emitResolveWithBase(thisRegister.get(), func.get(), generator.propertyNames().eval);
+    return generator.emitCallEval(generator.finalDestination(dst, func.get()), func.get(), thisRegister.get(), m_args.get(), divot(), startOffset(), endOffset());
+}
+
+// ------------------------------ FunctionCallValueNode ----------------------------------
+
+FunctionCallValueNode::~FunctionCallValueNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void FunctionCallValueNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+    releaser.release(m_args);
+}
+
+RegisterID* FunctionCallValueNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> func = generator.emitNode(m_expr.get());
+    RefPtr<RegisterID> thisRegister = generator.emitLoad(generator.newTemporary(), jsNull());
+    return generator.emitCall(generator.finalDestination(dst, func.get()), func.get(), thisRegister.get(), m_args.get(), divot(), startOffset(), endOffset());
+}
+
+// ------------------------------ FunctionCallResolveNode ----------------------------------
+
+FunctionCallResolveNode::~FunctionCallResolveNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void FunctionCallResolveNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_args);
+}
+
+RegisterID* FunctionCallResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (RefPtr<RegisterID> local = generator.registerFor(m_ident)) {
+        RefPtr<RegisterID> thisRegister = generator.emitLoad(generator.newTemporary(), jsNull());
+        return generator.emitCall(generator.finalDestination(dst, thisRegister.get()), local.get(), thisRegister.get(), m_args.get(), divot(), startOffset(), endOffset());
+    }
+
+    int index = 0;
+    size_t depth = 0;
+    JSObject* globalObject = 0;
+    if (generator.findScopedProperty(m_ident, index, depth, false, globalObject) && index != missingSymbolMarker()) {
+        RefPtr<RegisterID> func = generator.emitGetScopedVar(generator.newTemporary(), depth, index, globalObject);
+        RefPtr<RegisterID> thisRegister = generator.emitLoad(generator.newTemporary(), jsNull());
+        return generator.emitCall(generator.finalDestination(dst, func.get()), func.get(), thisRegister.get(), m_args.get(), divot(), startOffset(), endOffset());
+    }
+
+    RefPtr<RegisterID> func = generator.tempDestination(dst);
+    RefPtr<RegisterID> thisRegister = generator.newTemporary();
+    int identifierStart = divot() - startOffset();
+    generator.emitExpressionInfo(identifierStart + m_ident.size(), m_ident.size(), 0);
+    generator.emitResolveFunction(thisRegister.get(), func.get(), m_ident);
+    return generator.emitCall(generator.finalDestination(dst, func.get()), func.get(), thisRegister.get(), m_args.get(), divot(), startOffset(), endOffset());
+}
+
+// ------------------------------ FunctionCallBracketNode ----------------------------------
+
+FunctionCallBracketNode::~FunctionCallBracketNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void FunctionCallBracketNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_subscript);
+    releaser.release(m_args);
+}
+
+RegisterID* FunctionCallBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNode(m_base.get());
+    RegisterID* property = generator.emitNode(m_subscript.get());
+    generator.emitExpressionInfo(divot() - m_subexpressionDivotOffset, startOffset() - m_subexpressionDivotOffset, m_subexpressionEndOffset);
+    RefPtr<RegisterID> function = generator.emitGetByVal(generator.tempDestination(dst), base.get(), property);
+    RefPtr<RegisterID> thisRegister = generator.emitMove(generator.newTemporary(), base.get());
+    return generator.emitCall(generator.finalDestination(dst, function.get()), function.get(), thisRegister.get(), m_args.get(), divot(), startOffset(), endOffset());
+}
+
+// ------------------------------ FunctionCallDotNode ----------------------------------
+
+FunctionCallDotNode::~FunctionCallDotNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void FunctionCallDotNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_args);
+}
+
+RegisterID* FunctionCallDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNode(m_base.get());
+    generator.emitExpressionInfo(divot() - m_subexpressionDivotOffset, startOffset() - m_subexpressionDivotOffset, m_subexpressionEndOffset);
+    RefPtr<RegisterID> function = generator.emitGetById(generator.tempDestination(dst), base.get(), m_ident);
+    RefPtr<RegisterID> thisRegister = generator.emitMove(generator.newTemporary(), base.get());
+    return generator.emitCall(generator.finalDestination(dst, function.get()), function.get(), thisRegister.get(), m_args.get(), divot(), startOffset(), endOffset());
+}
+
+// ------------------------------ PostfixResolveNode ----------------------------------
+
+static RegisterID* emitPreIncOrDec(BytecodeGenerator& generator, RegisterID* srcDst, Operator oper)
+{
+    return (oper == OpPlusPlus) ? generator.emitPreInc(srcDst) : generator.emitPreDec(srcDst);
+}
+
+static RegisterID* emitPostIncOrDec(BytecodeGenerator& generator, RegisterID* dst, RegisterID* srcDst, Operator oper)
+{
+    return (oper == OpPlusPlus) ? generator.emitPostInc(dst, srcDst) : generator.emitPostDec(dst, srcDst);
+}
+
+RegisterID* PostfixResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (RegisterID* local = generator.registerFor(m_ident)) {
+        if (generator.isLocalConstant(m_ident)) {
+            if (dst == generator.ignoredResult())
+                return 0;
+            return generator.emitToJSNumber(generator.finalDestination(dst), local);
+        }
+
+        if (dst == generator.ignoredResult())
+            return emitPreIncOrDec(generator, local, m_operator);
+        return emitPostIncOrDec(generator, generator.finalDestination(dst), local, m_operator);
+    }
+
+    int index = 0;
+    size_t depth = 0;
+    JSObject* globalObject = 0;
+    if (generator.findScopedProperty(m_ident, index, depth, true, globalObject) && index != missingSymbolMarker()) {
+        RefPtr<RegisterID> value = generator.emitGetScopedVar(generator.newTemporary(), depth, index, globalObject);
+        RegisterID* oldValue;
+        if (dst == generator.ignoredResult()) {
+            oldValue = 0;
+            emitPreIncOrDec(generator, value.get(), m_operator);
+        } else {
+            oldValue = emitPostIncOrDec(generator, generator.finalDestination(dst), value.get(), m_operator);
+        }
+        generator.emitPutScopedVar(depth, index, value.get(), globalObject);
+        return oldValue;
+    }
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    RefPtr<RegisterID> value = generator.newTemporary();
+    RefPtr<RegisterID> base = generator.emitResolveWithBase(generator.newTemporary(), value.get(), m_ident);
+    RegisterID* oldValue;
+    if (dst == generator.ignoredResult()) {
+        oldValue = 0;
+        emitPreIncOrDec(generator, value.get(), m_operator);
+    } else {
+        oldValue = emitPostIncOrDec(generator, generator.finalDestination(dst), value.get(), m_operator);
+    }
+    generator.emitPutById(base.get(), m_ident, value.get());
+    return oldValue;
+}
+
+// ------------------------------ PostfixBracketNode ----------------------------------
+
+PostfixBracketNode::~PostfixBracketNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void PostfixBracketNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_subscript);
+}
+
+RegisterID* PostfixBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNode(m_base.get());
+    RefPtr<RegisterID> property = generator.emitNode(m_subscript.get());
+
+    generator.emitExpressionInfo(divot() - m_subexpressionDivotOffset, startOffset() - m_subexpressionDivotOffset, m_subexpressionEndOffset);
+    RefPtr<RegisterID> value = generator.emitGetByVal(generator.newTemporary(), base.get(), property.get());
+    RegisterID* oldValue;
+    if (dst == generator.ignoredResult()) {
+        oldValue = 0;
+        if (m_operator == OpPlusPlus)
+            generator.emitPreInc(value.get());
+        else
+            generator.emitPreDec(value.get());
+    } else {
+        oldValue = (m_operator == OpPlusPlus) ? generator.emitPostInc(generator.finalDestination(dst), value.get()) : generator.emitPostDec(generator.finalDestination(dst), value.get());
+    }
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    generator.emitPutByVal(base.get(), property.get(), value.get());
+    return oldValue;
+}
+
+// ------------------------------ PostfixDotNode ----------------------------------
+
+PostfixDotNode::~PostfixDotNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void PostfixDotNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+}
+
+RegisterID* PostfixDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNode(m_base.get());
+
+    generator.emitExpressionInfo(divot() - m_subexpressionDivotOffset, startOffset() - m_subexpressionDivotOffset, m_subexpressionEndOffset);
+    RefPtr<RegisterID> value = generator.emitGetById(generator.newTemporary(), base.get(), m_ident);
+    RegisterID* oldValue;
+    if (dst == generator.ignoredResult()) {
+        oldValue = 0;
+        if (m_operator == OpPlusPlus)
+            generator.emitPreInc(value.get());
+        else
+            generator.emitPreDec(value.get());
+    } else {
+        oldValue = (m_operator == OpPlusPlus) ? generator.emitPostInc(generator.finalDestination(dst), value.get()) : generator.emitPostDec(generator.finalDestination(dst), value.get());
+    }
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    generator.emitPutById(base.get(), m_ident, value.get());
+    return oldValue;
+}
+
+// ------------------------------ PostfixErrorNode -----------------------------------
+
+PostfixErrorNode::~PostfixErrorNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void PostfixErrorNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+}
+
+RegisterID* PostfixErrorNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
+{
+    return emitThrowError(generator, ReferenceError, m_operator == OpPlusPlus ? "Postfix ++ operator applied to value that is not a reference." : "Postfix -- operator applied to value that is not a reference.");
+}
+
+// ------------------------------ DeleteResolveNode -----------------------------------
+
+RegisterID* DeleteResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (generator.registerFor(m_ident))
+        return generator.emitUnexpectedLoad(generator.finalDestination(dst), false);
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    RegisterID* base = generator.emitResolveBase(generator.tempDestination(dst), m_ident);
+    return generator.emitDeleteById(generator.finalDestination(dst, base), base, m_ident);
+}
+
+// ------------------------------ DeleteBracketNode -----------------------------------
+
+DeleteBracketNode::~DeleteBracketNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void DeleteBracketNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_subscript);
+}
+
+RegisterID* DeleteBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> r0 = generator.emitNode(m_base.get());
+    RegisterID* r1 = generator.emitNode(m_subscript.get());
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    return generator.emitDeleteByVal(generator.finalDestination(dst), r0.get(), r1);
+}
+
+// ------------------------------ DeleteDotNode -----------------------------------
+
+DeleteDotNode::~DeleteDotNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void DeleteDotNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+}
+
+RegisterID* DeleteDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RegisterID* r0 = generator.emitNode(m_base.get());
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    return generator.emitDeleteById(generator.finalDestination(dst), r0, m_ident);
+}
+
+// ------------------------------ DeleteValueNode -----------------------------------
+
+DeleteValueNode::~DeleteValueNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void DeleteValueNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+}
+
+RegisterID* DeleteValueNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    generator.emitNode(generator.ignoredResult(), m_expr.get());
+
+    // delete on a non-location expression ignores the value and returns true
+    return generator.emitUnexpectedLoad(generator.finalDestination(dst), true);
+}
+
+// ------------------------------ VoidNode -------------------------------------
+
+VoidNode::~VoidNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void VoidNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+}
+
+RegisterID* VoidNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult()) {
+        generator.emitNode(generator.ignoredResult(), m_expr.get());
+        return 0;
+    }
+    RefPtr<RegisterID> r0 = generator.emitNode(m_expr.get());
+    return generator.emitLoad(dst, jsUndefined());
+}
+
+// ------------------------------ TypeOfValueNode -----------------------------------
+
+RegisterID* TypeOfResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (RegisterID* local = generator.registerFor(m_ident)) {
+        if (dst == generator.ignoredResult())
+            return 0;
+        return generator.emitTypeOf(generator.finalDestination(dst), local);
+    }
+
+    RefPtr<RegisterID> scratch = generator.emitResolveBase(generator.tempDestination(dst), m_ident);
+    generator.emitGetById(scratch.get(), scratch.get(), m_ident);
+    if (dst == generator.ignoredResult())
+        return 0;
+    return generator.emitTypeOf(generator.finalDestination(dst, scratch.get()), scratch.get());
+}
+
+// ------------------------------ TypeOfValueNode -----------------------------------
+
+TypeOfValueNode::~TypeOfValueNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void TypeOfValueNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+}
+
+RegisterID* TypeOfValueNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult()) {
+        generator.emitNode(generator.ignoredResult(), m_expr.get());
+        return 0;
+    }
+    RefPtr<RegisterID> src = generator.emitNode(m_expr.get());
+    return generator.emitTypeOf(generator.finalDestination(dst), src.get());
+}
+
+// ------------------------------ PrefixResolveNode ----------------------------------
+
+RegisterID* PrefixResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (RegisterID* local = generator.registerFor(m_ident)) {
+        if (generator.isLocalConstant(m_ident)) {
+            if (dst == generator.ignoredResult())
+                return 0;
+            RefPtr<RegisterID> r0 = generator.emitUnexpectedLoad(generator.finalDestination(dst), (m_operator == OpPlusPlus) ? 1.0 : -1.0);
+            return generator.emitBinaryOp(op_add, r0.get(), local, r0.get(), OperandTypes());
+        }
+
+        emitPreIncOrDec(generator, local, m_operator);
+        return generator.moveToDestinationIfNeeded(dst, local);
+    }
+
+    int index = 0;
+    size_t depth = 0;
+    JSObject* globalObject = 0;
+    if (generator.findScopedProperty(m_ident, index, depth, false, globalObject) && index != missingSymbolMarker()) {
+        RefPtr<RegisterID> propDst = generator.emitGetScopedVar(generator.tempDestination(dst), depth, index, globalObject);
+        emitPreIncOrDec(generator, propDst.get(), m_operator);
+        generator.emitPutScopedVar(depth, index, propDst.get(), globalObject);
+        return generator.moveToDestinationIfNeeded(dst, propDst.get());
+    }
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    RefPtr<RegisterID> propDst = generator.tempDestination(dst);
+    RefPtr<RegisterID> base = generator.emitResolveWithBase(generator.newTemporary(), propDst.get(), m_ident);
+    emitPreIncOrDec(generator, propDst.get(), m_operator);
+    generator.emitPutById(base.get(), m_ident, propDst.get());
+    return generator.moveToDestinationIfNeeded(dst, propDst.get());
+}
+
+// ------------------------------ PrefixBracketNode ----------------------------------
+
+PrefixBracketNode::~PrefixBracketNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void PrefixBracketNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_subscript);
+}
+
+RegisterID* PrefixBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNode(m_base.get());
+    RefPtr<RegisterID> property = generator.emitNode(m_subscript.get());
+    RefPtr<RegisterID> propDst = generator.tempDestination(dst);
+
+    generator.emitExpressionInfo(divot() + m_subexpressionDivotOffset, m_subexpressionStartOffset, endOffset() - m_subexpressionDivotOffset);
+    RegisterID* value = generator.emitGetByVal(propDst.get(), base.get(), property.get());
+    if (m_operator == OpPlusPlus)
+        generator.emitPreInc(value);
+    else
+        generator.emitPreDec(value);
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    generator.emitPutByVal(base.get(), property.get(), value);
+    return generator.moveToDestinationIfNeeded(dst, propDst.get());
+}
+
+// ------------------------------ PrefixDotNode ----------------------------------
+
+PrefixDotNode::~PrefixDotNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void PrefixDotNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+}
+
+RegisterID* PrefixDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNode(m_base.get());
+    RefPtr<RegisterID> propDst = generator.tempDestination(dst);
+
+    generator.emitExpressionInfo(divot() + m_subexpressionDivotOffset, m_subexpressionStartOffset, endOffset() - m_subexpressionDivotOffset);
+    RegisterID* value = generator.emitGetById(propDst.get(), base.get(), m_ident);
+    if (m_operator == OpPlusPlus)
+        generator.emitPreInc(value);
+    else
+        generator.emitPreDec(value);
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    generator.emitPutById(base.get(), m_ident, value);
+    return generator.moveToDestinationIfNeeded(dst, propDst.get());
+}
+
+// ------------------------------ PrefixErrorNode -----------------------------------
+
+PrefixErrorNode::~PrefixErrorNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void PrefixErrorNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+}
+
+RegisterID* PrefixErrorNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
+{
+    return emitThrowError(generator, ReferenceError, m_operator == OpPlusPlus ? "Prefix ++ operator applied to value that is not a reference." : "Prefix -- operator applied to value that is not a reference.");
+}
+
+// ------------------------------ Unary Operation Nodes -----------------------------------
+
+UnaryOpNode::~UnaryOpNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void UnaryOpNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+}
+
+RegisterID* UnaryOpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RegisterID* src = generator.emitNode(m_expr.get());
+    return generator.emitUnaryOp(opcodeID(), generator.finalDestination(dst), src);
+}
+
+// ------------------------------ Binary Operation Nodes -----------------------------------
+
+BinaryOpNode::~BinaryOpNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void BinaryOpNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr1);
+    releaser.release(m_expr2);
+}
+
+RegisterID* BinaryOpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    OpcodeID opcodeID = this->opcodeID();
+    if (opcodeID == op_neq) {
+        if (m_expr1->isNull() || m_expr2->isNull()) {
+            RefPtr<RegisterID> src = generator.tempDestination(dst);
+            generator.emitNode(src.get(), m_expr1->isNull() ? m_expr2.get() : m_expr1.get());
+            return generator.emitUnaryOp(op_neq_null, generator.finalDestination(dst, src.get()), src.get());
+        }
+    }
+
+    RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(m_expr1.get(), m_rightHasAssignments, m_expr2->isPure(generator));
+    RegisterID* src2 = generator.emitNode(m_expr2.get());
+    return generator.emitBinaryOp(opcodeID, generator.finalDestination(dst, src1.get()), src1.get(), src2, OperandTypes(m_expr1->resultDescriptor(), m_expr2->resultDescriptor()));
+}
+
+RegisterID* EqualNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (m_expr1->isNull() || m_expr2->isNull()) {
+        RefPtr<RegisterID> src = generator.tempDestination(dst);
+        generator.emitNode(src.get(), m_expr1->isNull() ? m_expr2.get() : m_expr1.get());
+        return generator.emitUnaryOp(op_eq_null, generator.finalDestination(dst, src.get()), src.get());
+    }
+
+    RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(m_expr1.get(), m_rightHasAssignments, m_expr2->isPure(generator));
+    RegisterID* src2 = generator.emitNode(m_expr2.get());
+    return generator.emitEqualityOp(op_eq, generator.finalDestination(dst, src1.get()), src1.get(), src2);
+}
+
+RegisterID* StrictEqualNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(m_expr1.get(), m_rightHasAssignments, m_expr2->isPure(generator));
+    RegisterID* src2 = generator.emitNode(m_expr2.get());
+    return generator.emitEqualityOp(op_stricteq, generator.finalDestination(dst, src1.get()), src1.get(), src2);
+}
+
+RegisterID* ReverseBinaryOpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(m_expr1.get(), m_rightHasAssignments, m_expr2->isPure(generator));
+    RegisterID* src2 = generator.emitNode(m_expr2.get());
+    return generator.emitBinaryOp(opcodeID(), generator.finalDestination(dst, src1.get()), src2, src1.get(), OperandTypes(m_expr2->resultDescriptor(), m_expr1->resultDescriptor()));
+}
+
+RegisterID* ThrowableBinaryOpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(m_expr1.get(), m_rightHasAssignments, m_expr2->isPure(generator));
+    RegisterID* src2 = generator.emitNode(m_expr2.get());
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    return generator.emitBinaryOp(opcodeID(), generator.finalDestination(dst, src1.get()), src1.get(), src2, OperandTypes(m_expr1->resultDescriptor(), m_expr2->resultDescriptor()));
+}
+
+RegisterID* InstanceOfNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(m_expr1.get(), m_rightHasAssignments, m_expr2->isPure(generator));
+    RefPtr<RegisterID> src2 = generator.emitNode(m_expr2.get());
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    generator.emitGetByIdExceptionInfo(op_instanceof);
+    RegisterID* src2Prototype = generator.emitGetById(generator.newTemporary(), src2.get(), generator.globalData()->propertyNames->prototype);
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    return generator.emitInstanceOf(generator.finalDestination(dst, src1.get()), src1.get(), src2.get(), src2Prototype);
+}
+
+// ------------------------------ LogicalOpNode ----------------------------
+
+LogicalOpNode::~LogicalOpNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void LogicalOpNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr1);
+    releaser.release(m_expr2);
+}
+
+RegisterID* LogicalOpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> temp = generator.tempDestination(dst);
+    RefPtr<Label> target = generator.newLabel();
+    
+    generator.emitNode(temp.get(), m_expr1.get());
+    if (m_operator == OpLogicalAnd)
+        generator.emitJumpIfFalse(temp.get(), target.get());
+    else
+        generator.emitJumpIfTrue(temp.get(), target.get());
+    generator.emitNode(temp.get(), m_expr2.get());
+    generator.emitLabel(target.get());
+
+    return generator.moveToDestinationIfNeeded(dst, temp.get());
+}
+
+// ------------------------------ ConditionalNode ------------------------------
+
+ConditionalNode::~ConditionalNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ConditionalNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_logical);
+    releaser.release(m_expr1);
+    releaser.release(m_expr2);
+}
+
+RegisterID* ConditionalNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> newDst = generator.finalDestination(dst);
+    RefPtr<Label> beforeElse = generator.newLabel();
+    RefPtr<Label> afterElse = generator.newLabel();
+
+    RegisterID* cond = generator.emitNode(m_logical.get());
+    generator.emitJumpIfFalse(cond, beforeElse.get());
+
+    generator.emitNode(newDst.get(), m_expr1.get());
+    generator.emitJump(afterElse.get());
+
+    generator.emitLabel(beforeElse.get());
+    generator.emitNode(newDst.get(), m_expr2.get());
+
+    generator.emitLabel(afterElse.get());
+
+    return newDst.get();
+}
+
+// ------------------------------ ReadModifyResolveNode -----------------------------------
+
+ReadModifyResolveNode::~ReadModifyResolveNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ReadModifyResolveNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_right);
+}
+
+// FIXME: should this be moved to be a method on BytecodeGenerator?
+static ALWAYS_INLINE RegisterID* emitReadModifyAssignment(BytecodeGenerator& generator, RegisterID* dst, RegisterID* src1, RegisterID* src2, Operator oper, OperandTypes types)
+{
+    OpcodeID opcodeID;
+    switch (oper) {
+        case OpMultEq:
+            opcodeID = op_mul;
+            break;
+        case OpDivEq:
+            opcodeID = op_div;
+            break;
+        case OpPlusEq:
+            opcodeID = op_add;
+            break;
+        case OpMinusEq:
+            opcodeID = op_sub;
+            break;
+        case OpLShift:
+            opcodeID = op_lshift;
+            break;
+        case OpRShift:
+            opcodeID = op_rshift;
+            break;
+        case OpURShift:
+            opcodeID = op_urshift;
+            break;
+        case OpAndEq:
+            opcodeID = op_bitand;
+            break;
+        case OpXOrEq:
+            opcodeID = op_bitxor;
+            break;
+        case OpOrEq:
+            opcodeID = op_bitor;
+            break;
+        case OpModEq:
+            opcodeID = op_mod;
+            break;
+        default:
+            ASSERT_NOT_REACHED();
+            return dst;
+    }
+    
+    return generator.emitBinaryOp(opcodeID, dst, src1, src2, types);
+}
+
+RegisterID* ReadModifyResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (RegisterID* local = generator.registerFor(m_ident)) {
+        if (generator.isLocalConstant(m_ident)) {
+            RegisterID* src2 = generator.emitNode(m_right.get());
+            return emitReadModifyAssignment(generator, generator.finalDestination(dst), local, src2, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
+        }
+        
+        if (generator.leftHandSideNeedsCopy(m_rightHasAssignments, m_right->isPure(generator))) {
+            RefPtr<RegisterID> result = generator.newTemporary();
+            generator.emitMove(result.get(), local);
+            RegisterID* src2 = generator.emitNode(m_right.get());
+            emitReadModifyAssignment(generator, result.get(), result.get(), src2, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
+            generator.emitMove(local, result.get());
+            return generator.moveToDestinationIfNeeded(dst, result.get());
+        }
+        
+        RegisterID* src2 = generator.emitNode(m_right.get());
+        RegisterID* result = emitReadModifyAssignment(generator, local, local, src2, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
+        return generator.moveToDestinationIfNeeded(dst, result);
+    }
+
+    int index = 0;
+    size_t depth = 0;
+    JSObject* globalObject = 0;
+    if (generator.findScopedProperty(m_ident, index, depth, true, globalObject) && index != missingSymbolMarker()) {
+        RefPtr<RegisterID> src1 = generator.emitGetScopedVar(generator.tempDestination(dst), depth, index, globalObject);
+        RegisterID* src2 = generator.emitNode(m_right.get());
+        RegisterID* result = emitReadModifyAssignment(generator, generator.finalDestination(dst, src1.get()), src1.get(), src2, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
+        generator.emitPutScopedVar(depth, index, result, globalObject);
+        return result;
+    }
+
+    RefPtr<RegisterID> src1 = generator.tempDestination(dst);
+    generator.emitExpressionInfo(divot() - startOffset() + m_ident.size(), m_ident.size(), 0);
+    RefPtr<RegisterID> base = generator.emitResolveWithBase(generator.newTemporary(), src1.get(), m_ident);
+    RegisterID* src2 = generator.emitNode(m_right.get());
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    RegisterID* result = emitReadModifyAssignment(generator, generator.finalDestination(dst, src1.get()), src1.get(), src2, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
+    return generator.emitPutById(base.get(), m_ident, result);
+}
+
+// ------------------------------ AssignResolveNode -----------------------------------
+
+AssignResolveNode::~AssignResolveNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void AssignResolveNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_right);
+}
+
+RegisterID* AssignResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (RegisterID* local = generator.registerFor(m_ident)) {
+        if (generator.isLocalConstant(m_ident))
+            return generator.emitNode(dst, m_right.get());
+        
+        RegisterID* result = generator.emitNode(local, m_right.get());
+        return generator.moveToDestinationIfNeeded(dst, result);
+    }
+
+    int index = 0;
+    size_t depth = 0;
+    JSObject* globalObject = 0;
+    if (generator.findScopedProperty(m_ident, index, depth, true, globalObject) && index != missingSymbolMarker()) {
+        if (dst == generator.ignoredResult())
+            dst = 0;
+        RegisterID* value = generator.emitNode(dst, m_right.get());
+        generator.emitPutScopedVar(depth, index, value, globalObject);
+        return value;
+    }
+
+    RefPtr<RegisterID> base = generator.emitResolveBase(generator.newTemporary(), m_ident);
+    if (dst == generator.ignoredResult())
+        dst = 0;
+    RegisterID* value = generator.emitNode(dst, m_right.get());
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    return generator.emitPutById(base.get(), m_ident, value);
+}
+
+// ------------------------------ AssignDotNode -----------------------------------
+
+AssignDotNode::~AssignDotNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void AssignDotNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_right);
+}
+
+RegisterID* AssignDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base.get(), m_rightHasAssignments, m_right->isPure(generator));
+    RefPtr<RegisterID> value = generator.destinationForAssignResult(dst);
+    RegisterID* result = generator.emitNode(value.get(), m_right.get());
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    generator.emitPutById(base.get(), m_ident, result);
+    return generator.moveToDestinationIfNeeded(dst, result);
+}
+
+// ------------------------------ ReadModifyDotNode -----------------------------------
+
+ReadModifyDotNode::~ReadModifyDotNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ReadModifyDotNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_right);
+}
+
+RegisterID* ReadModifyDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base.get(), m_rightHasAssignments, m_right->isPure(generator));
+
+    generator.emitExpressionInfo(divot() - m_subexpressionDivotOffset, startOffset() - m_subexpressionDivotOffset, m_subexpressionEndOffset);
+    RefPtr<RegisterID> value = generator.emitGetById(generator.tempDestination(dst), base.get(), m_ident);
+    RegisterID* change = generator.emitNode(m_right.get());
+    RegisterID* updatedValue = emitReadModifyAssignment(generator, generator.finalDestination(dst, value.get()), value.get(), change, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    return generator.emitPutById(base.get(), m_ident, updatedValue);
+}
+
+// ------------------------------ AssignErrorNode -----------------------------------
+
+AssignErrorNode::~AssignErrorNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void AssignErrorNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_left);
+    releaser.release(m_right);
+}
+
+RegisterID* AssignErrorNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
+{
+    return emitThrowError(generator, ReferenceError, "Left side of assignment is not a reference.");
+}
+
+// ------------------------------ AssignBracketNode -----------------------------------
+
+AssignBracketNode::~AssignBracketNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void AssignBracketNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_subscript);
+    releaser.release(m_right);
+}
+
+RegisterID* AssignBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base.get(), m_subscriptHasAssignments || m_rightHasAssignments, m_subscript->isPure(generator) && m_right->isPure(generator));
+    RefPtr<RegisterID> property = generator.emitNodeForLeftHandSide(m_subscript.get(), m_rightHasAssignments, m_right->isPure(generator));
+    RefPtr<RegisterID> value = generator.destinationForAssignResult(dst);
+    RegisterID* result = generator.emitNode(value.get(), m_right.get());
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    generator.emitPutByVal(base.get(), property.get(), result);
+    return generator.moveToDestinationIfNeeded(dst, result);
+}
+
+// ------------------------------ ReadModifyBracketNode -----------------------------------
+
+ReadModifyBracketNode::~ReadModifyBracketNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ReadModifyBracketNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_base);
+    releaser.release(m_subscript);
+    releaser.release(m_right);
+}
+
+RegisterID* ReadModifyBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base.get(), m_subscriptHasAssignments || m_rightHasAssignments, m_subscript->isPure(generator) && m_right->isPure(generator));
+    RefPtr<RegisterID> property = generator.emitNodeForLeftHandSide(m_subscript.get(), m_rightHasAssignments, m_right->isPure(generator));
+
+    generator.emitExpressionInfo(divot() - m_subexpressionDivotOffset, startOffset() - m_subexpressionDivotOffset, m_subexpressionEndOffset);
+    RefPtr<RegisterID> value = generator.emitGetByVal(generator.tempDestination(dst), base.get(), property.get());
+    RegisterID* change = generator.emitNode(m_right.get());
+    RegisterID* updatedValue = emitReadModifyAssignment(generator, generator.finalDestination(dst, value.get()), value.get(), change, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
+
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    generator.emitPutByVal(base.get(), property.get(), updatedValue);
+
+    return updatedValue;
+}
+
+// ------------------------------ CommaNode ------------------------------------
+
+CommaNode::~CommaNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void CommaNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr1);
+    releaser.release(m_expr2);
+}
+
+RegisterID* CommaNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    generator.emitNode(generator.ignoredResult(), m_expr1.get());
+    return generator.emitNode(dst, m_expr2.get());
+}
+
+// ------------------------------ ConstDeclNode ------------------------------------
+
+ConstDeclNode::~ConstDeclNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ConstDeclNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_next);
+    releaser.release(m_init);
+}
+
+ConstDeclNode::ConstDeclNode(JSGlobalData* globalData, const Identifier& ident, ExpressionNode* init)
+    : ExpressionNode(globalData)
+    , m_ident(ident)
+    , m_init(init)
+{
+}
+
+RegisterID* ConstDeclNode::emitCodeSingle(BytecodeGenerator& generator)
+{
+    if (RegisterID* local = generator.constRegisterFor(m_ident)) {
+        if (!m_init)
+            return local;
+
+        return generator.emitNode(local, m_init.get());
+    }
+    
+    // FIXME: While this code should only be hit in eval code, it will potentially
+    // assign to the wrong base if m_ident exists in an intervening dynamic scope.
+    RefPtr<RegisterID> base = generator.emitResolveBase(generator.newTemporary(), m_ident);
+    RegisterID* value = m_init ? generator.emitNode(m_init.get()) : generator.emitLoad(0, jsUndefined());
+    return generator.emitPutById(base.get(), m_ident, value);
+}
+
+RegisterID* ConstDeclNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
+{
+    RegisterID* result = 0;
+    for (ConstDeclNode* n = this; n; n = n->m_next.get())
+        result = n->emitCodeSingle(generator);
+
+    return result;
+}
+
+// ------------------------------ ConstStatementNode -----------------------------
+
+ConstStatementNode::~ConstStatementNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ConstStatementNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_next);
+}
+
+RegisterID* ConstStatementNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
+{
+    return generator.emitNode(m_next.get());
+}
+
+// ------------------------------ Helper functions for handling Vectors of StatementNode -------------------------------
+
+static inline RegisterID* statementListEmitCode(const StatementVector& statements, BytecodeGenerator& generator, RegisterID* dst)
+{
+    StatementVector::const_iterator end = statements.end();
+    for (StatementVector::const_iterator it = statements.begin(); it != end; ++it) {
+        StatementNode* n = it->get();
+        if (!n->isLoop())
+            generator.emitDebugHook(WillExecuteStatement, n->firstLine(), n->lastLine());
+        generator.emitNode(dst, n);
+    }
+    return 0;
+}
+
+// ------------------------------ BlockNode ------------------------------------
+
+BlockNode::~BlockNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void BlockNode::releaseNodes(NodeReleaser& releaser)
+{
+    size_t size = m_children.size();
+    for (size_t i = 0; i < size; ++i)
+        releaser.release(m_children[i]);
+}
+
+BlockNode::BlockNode(JSGlobalData* globalData, SourceElements* children)
+    : StatementNode(globalData)
+{
+    if (children)
+        children->releaseContentsIntoVector(m_children);
+}
+
+RegisterID* BlockNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    return statementListEmitCode(m_children, generator, dst);
+}
+
+// ------------------------------ EmptyStatementNode ---------------------------
+
+RegisterID* EmptyStatementNode::emitBytecode(BytecodeGenerator&, RegisterID* dst)
+{
+    return dst;
+}
+
+// ------------------------------ DebuggerStatementNode ---------------------------
+
+RegisterID* DebuggerStatementNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    generator.emitDebugHook(DidReachBreakpoint, firstLine(), lastLine());
+    return dst;
+}
+
+// ------------------------------ ExprStatementNode ----------------------------
+
+RegisterID* ExprStatementNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    ASSERT(m_expr);
+    return generator.emitNode(dst, m_expr.get());
+}
+
+// ------------------------------ VarStatementNode ----------------------------
+
+VarStatementNode::~VarStatementNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void VarStatementNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+}
+
+RegisterID* VarStatementNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
+{
+    ASSERT(m_expr);
+    return generator.emitNode(m_expr.get());
+}
+
+// ------------------------------ IfNode ---------------------------------------
+
+IfNode::~IfNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void IfNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_condition);
+    releaser.release(m_ifBlock);
+}
+
+RegisterID* IfNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<Label> afterThen = generator.newLabel();
+
+    RegisterID* cond = generator.emitNode(m_condition.get());
+    generator.emitJumpIfFalse(cond, afterThen.get());
+
+    if (!m_ifBlock->isBlock())
+        generator.emitDebugHook(WillExecuteStatement, m_ifBlock->firstLine(), m_ifBlock->lastLine());
+
+    generator.emitNode(dst, m_ifBlock.get());
+    generator.emitLabel(afterThen.get());
+
+    // FIXME: This should return the last statement executed so that it can be returned as a Completion.
+    return 0;
+}
+
+// ------------------------------ IfElseNode ---------------------------------------
+
+IfElseNode::~IfElseNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void IfElseNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_elseBlock);
+    IfNode::releaseNodes(releaser);
+}
+
+RegisterID* IfElseNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<Label> beforeElse = generator.newLabel();
+    RefPtr<Label> afterElse = generator.newLabel();
+
+    RegisterID* cond = generator.emitNode(m_condition.get());
+    generator.emitJumpIfFalse(cond, beforeElse.get());
+
+    if (!m_ifBlock->isBlock())
+        generator.emitDebugHook(WillExecuteStatement, m_ifBlock->firstLine(), m_ifBlock->lastLine());
+
+    generator.emitNode(dst, m_ifBlock.get());
+    generator.emitJump(afterElse.get());
+
+    generator.emitLabel(beforeElse.get());
+
+    if (!m_elseBlock->isBlock())
+        generator.emitDebugHook(WillExecuteStatement, m_elseBlock->firstLine(), m_elseBlock->lastLine());
+
+    generator.emitNode(dst, m_elseBlock.get());
+
+    generator.emitLabel(afterElse.get());
+
+    // FIXME: This should return the last statement executed so that it can be returned as a Completion.
+    return 0;
+}
+
+// ------------------------------ DoWhileNode ----------------------------------
+
+DoWhileNode::~DoWhileNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void DoWhileNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_statement);
+    releaser.release(m_expr);
+}
+
+RegisterID* DoWhileNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
+
+    RefPtr<Label> topOfLoop = generator.newLabel();
+    generator.emitLabel(topOfLoop.get());
+
+    generator.emitDebugHook(WillExecuteStatement, firstLine(), lastLine());
+
+    if (!m_statement->isBlock())
+        generator.emitDebugHook(WillExecuteStatement, m_statement->firstLine(), m_statement->lastLine());
+        
+    RefPtr<RegisterID> result = generator.emitNode(dst, m_statement.get());
+
+    generator.emitLabel(scope->continueTarget());
+    generator.emitDebugHook(WillExecuteStatement, m_expr->lineNo(), m_expr->lineNo());
+    RegisterID* cond = generator.emitNode(m_expr.get());
+    generator.emitJumpIfTrue(cond, topOfLoop.get());
+
+    generator.emitLabel(scope->breakTarget());
+    return result.get();
+}
+
+// ------------------------------ WhileNode ------------------------------------
+
+WhileNode::~WhileNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void WhileNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+    releaser.release(m_statement);
+}
+
+RegisterID* WhileNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
+
+    generator.emitJump(scope->continueTarget());
+
+    RefPtr<Label> topOfLoop = generator.newLabel();
+    generator.emitLabel(topOfLoop.get());
+
+    if (!m_statement->isBlock())
+        generator.emitDebugHook(WillExecuteStatement, m_statement->firstLine(), m_statement->lastLine());
+ 
+    generator.emitNode(dst, m_statement.get());
+
+    generator.emitLabel(scope->continueTarget());
+    generator.emitDebugHook(WillExecuteStatement, m_expr->lineNo(), m_expr->lineNo());
+    RegisterID* cond = generator.emitNode(m_expr.get());
+    generator.emitJumpIfTrue(cond, topOfLoop.get());
+
+    generator.emitLabel(scope->breakTarget());
+    
+    // FIXME: This should return the last statement executed so that it can be returned as a Completion
+    return 0;
+}
+
+// ------------------------------ ForNode --------------------------------------
+
+ForNode::~ForNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ForNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr1);
+    releaser.release(m_expr2);
+    releaser.release(m_expr3);
+    releaser.release(m_statement);
+}
+
+RegisterID* ForNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult())
+        dst = 0;
+
+    RefPtr<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
+
+    generator.emitDebugHook(WillExecuteStatement, firstLine(), lastLine());
+
+    if (m_expr1)
+        generator.emitNode(generator.ignoredResult(), m_expr1.get());
+
+    RefPtr<Label> condition = generator.newLabel();
+    generator.emitJump(condition.get());
+
+    RefPtr<Label> topOfLoop = generator.newLabel();
+    generator.emitLabel(topOfLoop.get());
+
+    if (!m_statement->isBlock())
+        generator.emitDebugHook(WillExecuteStatement, m_statement->firstLine(), m_statement->lastLine());
+    RefPtr<RegisterID> result = generator.emitNode(dst, m_statement.get());
+
+    generator.emitLabel(scope->continueTarget());
+    if (m_expr3)
+        generator.emitNode(generator.ignoredResult(), m_expr3.get());
+
+    generator.emitLabel(condition.get());
+    if (m_expr2) {
+        RegisterID* cond = generator.emitNode(m_expr2.get());
+        generator.emitJumpIfTrue(cond, topOfLoop.get());
+    } else
+        generator.emitJump(topOfLoop.get());
+
+    generator.emitLabel(scope->breakTarget());
+    return result.get();
+}
+
+// ------------------------------ ForInNode ------------------------------------
+
+ForInNode::~ForInNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ForInNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_init);
+    releaser.release(m_lexpr);
+    releaser.release(m_expr);
+    releaser.release(m_statement);
+}
+
+ForInNode::ForInNode(JSGlobalData* globalData, ExpressionNode* l, ExpressionNode* expr, StatementNode* statement)
+    : StatementNode(globalData)
+    , m_init(0L)
+    , m_lexpr(l)
+    , m_expr(expr)
+    , m_statement(statement)
+    , m_identIsVarDecl(false)
+{
+}
+
+ForInNode::ForInNode(JSGlobalData* globalData, const Identifier& ident, ExpressionNode* in, ExpressionNode* expr, StatementNode* statement, int divot, int startOffset, int endOffset)
+    : StatementNode(globalData)
+    , m_ident(ident)
+    , m_lexpr(new ResolveNode(globalData, ident, divot - startOffset))
+    , m_expr(expr)
+    , m_statement(statement)
+    , m_identIsVarDecl(true)
+{
+    if (in) {
+        AssignResolveNode* node = new AssignResolveNode(globalData, ident, in, true);
+        node->setExceptionSourceCode(divot, divot - startOffset, endOffset - divot);
+        m_init = node;
+    }
+    // for( var foo = bar in baz )
+}
+
+RegisterID* ForInNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
+
+    if (!m_lexpr->isLocation())
+        return emitThrowError(generator, ReferenceError, "Left side of for-in statement is not a reference.");
+
+    RefPtr<Label> continueTarget = generator.newLabel(); 
+
+    generator.emitDebugHook(WillExecuteStatement, firstLine(), lastLine());
+
+    if (m_init)
+        generator.emitNode(generator.ignoredResult(), m_init.get());
+    RegisterID* forInBase = generator.emitNode(m_expr.get());
+    RefPtr<RegisterID> iter = generator.emitGetPropertyNames(generator.newTemporary(), forInBase);
+    generator.emitJump(scope->continueTarget());
+
+    RefPtr<Label> loopStart = generator.newLabel();
+    generator.emitLabel(loopStart.get());
+
+    RegisterID* propertyName;
+    if (m_lexpr->isResolveNode()) {
+        const Identifier& ident = static_cast<ResolveNode*>(m_lexpr.get())->identifier();
+        propertyName = generator.registerFor(ident);
+        if (!propertyName) {
+            propertyName = generator.newTemporary();
+            RefPtr<RegisterID> protect = propertyName;
+            RegisterID* base = generator.emitResolveBase(generator.newTemporary(), ident);
+
+            generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+            generator.emitPutById(base, ident, propertyName);
+        }
+    } else if (m_lexpr->isDotAccessorNode()) {
+        DotAccessorNode* assignNode = static_cast<DotAccessorNode*>(m_lexpr.get());
+        const Identifier& ident = assignNode->identifier();
+        propertyName = generator.newTemporary();
+        RefPtr<RegisterID> protect = propertyName;
+        RegisterID* base = generator.emitNode(assignNode->base());
+
+        generator.emitExpressionInfo(assignNode->divot(), assignNode->startOffset(), assignNode->endOffset());
+        generator.emitPutById(base, ident, propertyName);
+    } else {
+        ASSERT(m_lexpr->isBracketAccessorNode());
+        BracketAccessorNode* assignNode = static_cast<BracketAccessorNode*>(m_lexpr.get());
+        propertyName = generator.newTemporary();
+        RefPtr<RegisterID> protect = propertyName;
+        RefPtr<RegisterID> base = generator.emitNode(assignNode->base());
+        RegisterID* subscript = generator.emitNode(assignNode->subscript());
+        
+        generator.emitExpressionInfo(assignNode->divot(), assignNode->startOffset(), assignNode->endOffset());
+        generator.emitPutByVal(base.get(), subscript, propertyName);
+    }   
+
+    if (!m_statement->isBlock())
+        generator.emitDebugHook(WillExecuteStatement, m_statement->firstLine(), m_statement->lastLine());
+    generator.emitNode(dst, m_statement.get());
+
+    generator.emitLabel(scope->continueTarget());
+    generator.emitNextPropertyName(propertyName, iter.get(), loopStart.get());
+    generator.emitLabel(scope->breakTarget());
+    return dst;
+}
+
+// ------------------------------ ContinueNode ---------------------------------
+
+// ECMA 12.7
+RegisterID* ContinueNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    LabelScope* scope = generator.continueTarget(m_ident);
+
+    if (!scope)
+        return m_ident.isEmpty()
+            ? emitThrowError(generator, SyntaxError, "Invalid continue statement.")
+            : emitThrowError(generator, SyntaxError, "Undefined label: '%s'.", m_ident);
+
+    generator.emitJumpScopes(scope->continueTarget(), scope->scopeDepth());
+    return dst;
+}
+
+// ------------------------------ BreakNode ------------------------------------
+
+// ECMA 12.8
+RegisterID* BreakNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    LabelScope* scope = generator.breakTarget(m_ident);
+    
+    if (!scope)
+        return m_ident.isEmpty()
+            ? emitThrowError(generator, SyntaxError, "Invalid break statement.")
+            : emitThrowError(generator, SyntaxError, "Undefined label: '%s'.", m_ident);
+
+    generator.emitJumpScopes(scope->breakTarget(), scope->scopeDepth());
+    return dst;
+}
+
+// ------------------------------ ReturnNode -----------------------------------
+
+ReturnNode::~ReturnNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ReturnNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_value);
+}
+
+RegisterID* ReturnNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (generator.codeType() != FunctionCode)
+        return emitThrowError(generator, SyntaxError, "Invalid return statement.");
+
+    if (dst == generator.ignoredResult())
+        dst = 0;
+    RegisterID* r0 = m_value ? generator.emitNode(dst, m_value.get()) : generator.emitLoad(dst, jsUndefined());
+    RefPtr<RegisterID> returnRegister;
+    if (generator.scopeDepth()) {
+        RefPtr<Label> l0 = generator.newLabel();
+        if (generator.hasFinaliser() && !r0->isTemporary()) {
+            returnRegister = generator.emitMove(generator.newTemporary(), r0);
+            r0 = returnRegister.get();
+        }
+        generator.emitJumpScopes(l0.get(), 0);
+        generator.emitLabel(l0.get());
+    }
+    generator.emitDebugHook(WillLeaveCallFrame, firstLine(), lastLine());
+    return generator.emitReturn(r0);
+}
+
+// ------------------------------ WithNode -------------------------------------
+
+WithNode::~WithNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void WithNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+    releaser.release(m_statement);
+}
+
+RegisterID* WithNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<RegisterID> scope = generator.newTemporary();
+    generator.emitNode(scope.get(), m_expr.get()); // scope must be protected until popped
+    generator.emitExpressionInfo(m_divot, m_expressionLength, 0);
+    generator.emitPushScope(scope.get());
+    RegisterID* result = generator.emitNode(dst, m_statement.get());
+    generator.emitPopScope();
+    return result;
+}
+
+// ------------------------------ CaseClauseNode --------------------------------
+
+CaseClauseNode::~CaseClauseNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void CaseClauseNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+}
+
+// ------------------------------ ClauseListNode --------------------------------
+
+ClauseListNode::~ClauseListNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ClauseListNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_clause);
+    releaser.release(m_next);
+}
+
+// ------------------------------ CaseBlockNode --------------------------------
+
+CaseBlockNode::~CaseBlockNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void CaseBlockNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_list1);
+    releaser.release(m_defaultClause);
+    releaser.release(m_list2);
+}
+
+enum SwitchKind { 
+    SwitchUnset = 0,
+    SwitchNumber = 1, 
+    SwitchString = 2, 
+    SwitchNeither = 3 
+};
+
+static void processClauseList(ClauseListNode* list, Vector<ExpressionNode*, 8>& literalVector, SwitchKind& typeForTable, bool& singleCharacterSwitch, int32_t& min_num, int32_t& max_num)
+{
+    for (; list; list = list->getNext()) {
+        ExpressionNode* clauseExpression = list->getClause()->expr();
+        literalVector.append(clauseExpression);
+        if (clauseExpression->isNumber()) {
+            double value = static_cast<NumberNode*>(clauseExpression)->value();
+            JSValuePtr jsValue = JSValuePtr::makeInt32Fast(static_cast<int32_t>(value));
+            if ((typeForTable & ~SwitchNumber) || !jsValue || (jsValue.getInt32Fast() != value)) {
+                typeForTable = SwitchNeither;
+                break;
+            }
+            int32_t intVal = static_cast<int32_t>(value);
+            ASSERT(intVal == value);
+            if (intVal < min_num)
+                min_num = intVal;
+            if (intVal > max_num)
+                max_num = intVal;
+            typeForTable = SwitchNumber;
+            continue;
+        }
+        if (clauseExpression->isString()) {
+            if (typeForTable & ~SwitchString) {
+                typeForTable = SwitchNeither;
+                break;
+            }
+            const UString& value = static_cast<StringNode*>(clauseExpression)->value().ustring();
+            if (singleCharacterSwitch &= value.size() == 1) {
+                int32_t intVal = value.rep()->data()[0];
+                if (intVal < min_num)
+                    min_num = intVal;
+                if (intVal > max_num)
+                    max_num = intVal;
+            }
+            typeForTable = SwitchString;
+            continue;
+        }
+        typeForTable = SwitchNeither;
+        break;        
+    }
+}
+    
+SwitchInfo::SwitchType CaseBlockNode::tryOptimizedSwitch(Vector<ExpressionNode*, 8>& literalVector, int32_t& min_num, int32_t& max_num)
+{
+    SwitchKind typeForTable = SwitchUnset;
+    bool singleCharacterSwitch = true;
+    
+    processClauseList(m_list1.get(), literalVector, typeForTable, singleCharacterSwitch, min_num, max_num);
+    processClauseList(m_list2.get(), literalVector, typeForTable, singleCharacterSwitch, min_num, max_num);
+    
+    if (typeForTable == SwitchUnset || typeForTable == SwitchNeither)
+        return SwitchInfo::SwitchNone;
+    
+    if (typeForTable == SwitchNumber) {
+        int32_t range = max_num - min_num;
+        if (min_num <= max_num && range <= 1000 && (range / literalVector.size()) < 10)
+            return SwitchInfo::SwitchImmediate;
+        return SwitchInfo::SwitchNone;
+    } 
+    
+    ASSERT(typeForTable == SwitchString);
+    
+    if (singleCharacterSwitch) {
+        int32_t range = max_num - min_num;
+        if (min_num <= max_num && range <= 1000 && (range / literalVector.size()) < 10)
+            return SwitchInfo::SwitchCharacter;
+    }
+
+    return SwitchInfo::SwitchString;
+}
+
+RegisterID* CaseBlockNode::emitBytecodeForBlock(BytecodeGenerator& generator, RegisterID* switchExpression, RegisterID* dst)
+{
+    RefPtr<Label> defaultLabel;
+    Vector<RefPtr<Label>, 8> labelVector;
+    Vector<ExpressionNode*, 8> literalVector;
+    int32_t min_num = std::numeric_limits<int32_t>::max();
+    int32_t max_num = std::numeric_limits<int32_t>::min();
+    SwitchInfo::SwitchType switchType = tryOptimizedSwitch(literalVector, min_num, max_num);
+
+    if (switchType != SwitchInfo::SwitchNone) {
+        // Prepare the various labels
+        for (uint32_t i = 0; i < literalVector.size(); i++)
+            labelVector.append(generator.newLabel());
+        defaultLabel = generator.newLabel();
+        generator.beginSwitch(switchExpression, switchType);
+    } else {
+        // Setup jumps
+        for (ClauseListNode* list = m_list1.get(); list; list = list->getNext()) {
+            RefPtr<RegisterID> clauseVal = generator.newTemporary();
+            generator.emitNode(clauseVal.get(), list->getClause()->expr());
+            generator.emitBinaryOp(op_stricteq, clauseVal.get(), clauseVal.get(), switchExpression, OperandTypes());
+            labelVector.append(generator.newLabel());
+            generator.emitJumpIfTrue(clauseVal.get(), labelVector[labelVector.size() - 1].get());
+        }
+        
+        for (ClauseListNode* list = m_list2.get(); list; list = list->getNext()) {
+            RefPtr<RegisterID> clauseVal = generator.newTemporary();
+            generator.emitNode(clauseVal.get(), list->getClause()->expr());
+            generator.emitBinaryOp(op_stricteq, clauseVal.get(), clauseVal.get(), switchExpression, OperandTypes());
+            labelVector.append(generator.newLabel());
+            generator.emitJumpIfTrue(clauseVal.get(), labelVector[labelVector.size() - 1].get());
+        }
+        defaultLabel = generator.newLabel();
+        generator.emitJump(defaultLabel.get());
+    }
+
+    RegisterID* result = 0;
+
+    size_t i = 0;
+    for (ClauseListNode* list = m_list1.get(); list; list = list->getNext()) {
+        generator.emitLabel(labelVector[i++].get());
+        result = statementListEmitCode(list->getClause()->children(), generator, dst);
+    }
+
+    if (m_defaultClause) {
+        generator.emitLabel(defaultLabel.get());
+        result = statementListEmitCode(m_defaultClause->children(), generator, dst);
+    }
+
+    for (ClauseListNode* list = m_list2.get(); list; list = list->getNext()) {
+        generator.emitLabel(labelVector[i++].get());
+        result = statementListEmitCode(list->getClause()->children(), generator, dst);
+    }
+    if (!m_defaultClause)
+        generator.emitLabel(defaultLabel.get());
+
+    ASSERT(i == labelVector.size());
+    if (switchType != SwitchInfo::SwitchNone) {
+        ASSERT(labelVector.size() == literalVector.size());
+        generator.endSwitch(labelVector.size(), labelVector.data(), literalVector.data(), defaultLabel.get(), min_num, max_num);
+    }
+    return result;
+}
+
+// ------------------------------ SwitchNode -----------------------------------
+
+SwitchNode::~SwitchNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void SwitchNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+    releaser.release(m_block);
+}
+
+RegisterID* SwitchNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<LabelScope> scope = generator.newLabelScope(LabelScope::Switch);
+
+    RefPtr<RegisterID> r0 = generator.emitNode(m_expr.get());
+    RegisterID* r1 = m_block->emitBytecodeForBlock(generator, r0.get(), dst);
+
+    generator.emitLabel(scope->breakTarget());
+    return r1;
+}
+
+// ------------------------------ LabelNode ------------------------------------
+
+LabelNode::~LabelNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void LabelNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_statement);
+}
+
+RegisterID* LabelNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (generator.breakTarget(m_name))
+        return emitThrowError(generator, SyntaxError, "Duplicate label: %s.", m_name);
+
+    RefPtr<LabelScope> scope = generator.newLabelScope(LabelScope::NamedLabel, &m_name);
+    RegisterID* r0 = generator.emitNode(dst, m_statement.get());
+
+    generator.emitLabel(scope->breakTarget());
+    return r0;
+}
+
+// ------------------------------ ThrowNode ------------------------------------
+
+ThrowNode::~ThrowNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ThrowNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_expr);
+}
+
+RegisterID* ThrowNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult())
+        dst = 0;
+    RefPtr<RegisterID> expr = generator.emitNode(dst, m_expr.get());
+    generator.emitExpressionInfo(divot(), startOffset(), endOffset());
+    generator.emitThrow(expr.get());
+    return dst;
+}
+
+// ------------------------------ TryNode --------------------------------------
+
+TryNode::~TryNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void TryNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_tryBlock);
+    releaser.release(m_catchBlock);
+    releaser.release(m_finallyBlock);
+}
+
+RegisterID* TryNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    RefPtr<Label> tryStartLabel = generator.newLabel();
+    RefPtr<Label> tryEndLabel = generator.newLabel();
+    RefPtr<Label> finallyStart;
+    RefPtr<RegisterID> finallyReturnAddr;
+    if (m_finallyBlock) {
+        finallyStart = generator.newLabel();
+        finallyReturnAddr = generator.newTemporary();
+        generator.pushFinallyContext(finallyStart.get(), finallyReturnAddr.get());
+    }
+    generator.emitLabel(tryStartLabel.get());
+    generator.emitNode(dst, m_tryBlock.get());
+    generator.emitLabel(tryEndLabel.get());
+
+    if (m_catchBlock) {
+        RefPtr<Label> handlerEndLabel = generator.newLabel();
+        generator.emitJump(handlerEndLabel.get());
+        RefPtr<RegisterID> exceptionRegister = generator.emitCatch(generator.newTemporary(), tryStartLabel.get(), tryEndLabel.get());
+        if (m_catchHasEval) {
+            RefPtr<RegisterID> dynamicScopeObject = generator.emitNewObject(generator.newTemporary());
+            generator.emitPutById(dynamicScopeObject.get(), m_exceptionIdent, exceptionRegister.get());
+            generator.emitMove(exceptionRegister.get(), dynamicScopeObject.get());
+            generator.emitPushScope(exceptionRegister.get());
+        } else
+            generator.emitPushNewScope(exceptionRegister.get(), m_exceptionIdent, exceptionRegister.get());
+        generator.emitNode(dst, m_catchBlock.get());
+        generator.emitPopScope();
+        generator.emitLabel(handlerEndLabel.get());
+    }
+
+    if (m_finallyBlock) {
+        generator.popFinallyContext();
+        // there may be important registers live at the time we jump
+        // to a finally block (such as for a return or throw) so we
+        // ref the highest register ever used as a conservative
+        // approach to not clobbering anything important
+        RefPtr<RegisterID> highestUsedRegister = generator.highestUsedRegister();
+        RefPtr<Label> finallyEndLabel = generator.newLabel();
+        generator.emitJumpSubroutine(finallyReturnAddr.get(), finallyStart.get());
+        // Use a label to record the subtle fact that sret will return to the
+        // next instruction. sret is the only way to jump without an explicit label.
+        generator.emitLabel(generator.newLabel().get());
+        generator.emitJump(finallyEndLabel.get());
+
+        // Finally block for exception path
+        RefPtr<RegisterID> tempExceptionRegister = generator.emitCatch(generator.newTemporary(), tryStartLabel.get(), generator.emitLabel(generator.newLabel().get()).get());
+        generator.emitJumpSubroutine(finallyReturnAddr.get(), finallyStart.get());
+        // Use a label to record the subtle fact that sret will return to the
+        // next instruction. sret is the only way to jump without an explicit label.
+        generator.emitLabel(generator.newLabel().get());
+        generator.emitThrow(tempExceptionRegister.get());
+
+        // emit the finally block itself
+        generator.emitLabel(finallyStart.get());
+        generator.emitNode(dst, m_finallyBlock.get());
+        generator.emitSubroutineReturn(finallyReturnAddr.get());
+
+        generator.emitLabel(finallyEndLabel.get());
+    }
+
+    return dst;
+}
+
+// ------------------------------ ParameterNode -----------------------------
+
+ParameterNode::~ParameterNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ParameterNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_next);
+}
+
+// -----------------------------ScopeNodeData ---------------------------
+
+ScopeNodeData::ScopeNodeData(SourceElements* children, VarStack* varStack, FunctionStack* funcStack, int numConstants)
+    : m_numConstants(numConstants)
+{
+    if (varStack)
+        m_varStack = *varStack;
+    if (funcStack)
+        m_functionStack = *funcStack;
+    if (children)
+        children->releaseContentsIntoVector(m_children);
+}
+
+void ScopeNodeData::mark()
+{
+    FunctionStack::iterator end = m_functionStack.end();
+    for (FunctionStack::iterator ptr = m_functionStack.begin(); ptr != end; ++ptr) {
+        FunctionBodyNode* body = (*ptr)->body();
+        if (!body->isGenerated())
+            continue;
+        body->generatedBytecode().mark();
+    }
+}
+
+// ------------------------------ ScopeNode -----------------------------
+
+ScopeNode::ScopeNode(JSGlobalData* globalData)
+    : StatementNode(globalData)
+    , m_features(NoFeatures)
+{
+#if ENABLE(OPCODE_SAMPLING)
+    globalData->interpreter->sampler()->notifyOfScope(this);
+#endif
+}
+
+ScopeNode::ScopeNode(JSGlobalData* globalData, const SourceCode& source, SourceElements* children, VarStack* varStack, FunctionStack* funcStack, CodeFeatures features, int numConstants)
+    : StatementNode(globalData)
+    , m_data(new ScopeNodeData(children, varStack, funcStack, numConstants))
+    , m_features(features)
+    , m_source(source)
+{
+#if ENABLE(OPCODE_SAMPLING)
+    globalData->interpreter->sampler()->notifyOfScope(this);
+#endif
+}
+
+ScopeNode::~ScopeNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void ScopeNode::releaseNodes(NodeReleaser& releaser)
+{
+    if (!m_data)
+        return;
+    size_t size = m_data->m_children.size();
+    for (size_t i = 0; i < size; ++i)
+        releaser.release(m_data->m_children[i]);
+}
+
+// ------------------------------ ProgramNode -----------------------------
+
+ProgramNode::ProgramNode(JSGlobalData* globalData, SourceElements* children, VarStack* varStack, FunctionStack* funcStack, const SourceCode& source, CodeFeatures features, int numConstants)
+    : ScopeNode(globalData, source, children, varStack, funcStack, features, numConstants)
+{
+}
+
+ProgramNode* ProgramNode::create(JSGlobalData* globalData, SourceElements* children, VarStack* varStack, FunctionStack* funcStack, const SourceCode& source, CodeFeatures features, int numConstants)
+{
+    return new ProgramNode(globalData, children, varStack, funcStack, source, features, numConstants);
+}
+
+RegisterID* ProgramNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
+{
+    generator.emitDebugHook(WillExecuteProgram, firstLine(), lastLine());
+
+    RefPtr<RegisterID> dstRegister = generator.newTemporary();
+    generator.emitLoad(dstRegister.get(), jsUndefined());
+    statementListEmitCode(children(), generator, dstRegister.get());
+
+    generator.emitDebugHook(DidExecuteProgram, firstLine(), lastLine());
+    generator.emitEnd(dstRegister.get());
+    return 0;
+}
+
+void ProgramNode::generateBytecode(ScopeChainNode* scopeChainNode)
+{
+    ScopeChain scopeChain(scopeChainNode);
+    JSGlobalObject* globalObject = scopeChain.globalObject();
+    
+    m_code.set(new ProgramCodeBlock(this, GlobalCode, globalObject, source().provider()));
+    
+    BytecodeGenerator generator(this, globalObject->debugger(), scopeChain, &globalObject->symbolTable(), m_code.get());
+    generator.generate();
+
+    destroyData();
+}
+
+// ------------------------------ EvalNode -----------------------------
+
+EvalNode::EvalNode(JSGlobalData* globalData, SourceElements* children, VarStack* varStack, FunctionStack* funcStack, const SourceCode& source, CodeFeatures features, int numConstants)
+    : ScopeNode(globalData, source, children, varStack, funcStack, features, numConstants)
+{
+}
+
+EvalNode* EvalNode::create(JSGlobalData* globalData, SourceElements* children, VarStack* varStack, FunctionStack* funcStack, const SourceCode& source, CodeFeatures features, int numConstants)
+{
+    return new EvalNode(globalData, children, varStack, funcStack, source, features, numConstants);
+}
+
+RegisterID* EvalNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
+{
+    generator.emitDebugHook(WillExecuteProgram, firstLine(), lastLine());
+
+    RefPtr<RegisterID> dstRegister = generator.newTemporary();
+    generator.emitLoad(dstRegister.get(), jsUndefined());
+    statementListEmitCode(children(), generator, dstRegister.get());
+
+    generator.emitDebugHook(DidExecuteProgram, firstLine(), lastLine());
+    generator.emitEnd(dstRegister.get());
+    return 0;
+}
+
+void EvalNode::generateBytecode(ScopeChainNode* scopeChainNode)
+{
+    ScopeChain scopeChain(scopeChainNode);
+    JSGlobalObject* globalObject = scopeChain.globalObject();
+
+    m_code.set(new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth()));
+
+    BytecodeGenerator generator(this, globalObject->debugger(), scopeChain, &m_code->symbolTable(), m_code.get());
+    generator.generate();
+
+    // Eval code needs to hang on to its declaration stacks to keep declaration info alive until Interpreter::execute time,
+    // so the entire ScopeNodeData cannot be destoyed.
+    children().clear();
+}
+
+EvalCodeBlock& EvalNode::bytecodeForExceptionInfoReparse(ScopeChainNode* scopeChainNode, CodeBlock* codeBlockBeingRegeneratedFrom)
+{
+    ASSERT(!m_code);
+
+    ScopeChain scopeChain(scopeChainNode);
+    JSGlobalObject* globalObject = scopeChain.globalObject();
+
+    m_code.set(new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth()));
+
+    BytecodeGenerator generator(this, globalObject->debugger(), scopeChain, &m_code->symbolTable(), m_code.get());
+    generator.setRegeneratingForExceptionInfo(codeBlockBeingRegeneratedFrom);
+    generator.generate();
+
+    return *m_code;
+}
+
+void EvalNode::mark()
+{
+    // We don't need to mark our own CodeBlock as the JSGlobalObject takes care of that
+    data()->mark();
+}
+
+// ------------------------------ FunctionBodyNode -----------------------------
+
+FunctionBodyNode::FunctionBodyNode(JSGlobalData* globalData)
+    : ScopeNode(globalData)
+    , m_parameters(0)
+    , m_parameterCount(0)
+    , m_refCount(0)
+{
+}
+
+FunctionBodyNode::FunctionBodyNode(JSGlobalData* globalData, SourceElements* children, VarStack* varStack, FunctionStack* funcStack, const SourceCode& sourceCode, CodeFeatures features, int numConstants)
+    : ScopeNode(globalData, sourceCode, children, varStack, funcStack, features, numConstants)
+    , m_parameters(0)
+    , m_parameterCount(0)
+    , m_refCount(0)
+{
+}
+
+FunctionBodyNode::~FunctionBodyNode()
+{
+    ASSERT(!m_refCount);
+    for (size_t i = 0; i < m_parameterCount; ++i)
+        m_parameters[i].~Identifier();
+    fastFree(m_parameters);
+}
+
+void FunctionBodyNode::finishParsing(const SourceCode& source, ParameterNode* firstParameter)
+{
+    Vector<Identifier> parameters;
+    for (ParameterNode* parameter = firstParameter; parameter; parameter = parameter->nextParam())
+        parameters.append(parameter->ident());
+    size_t count = parameters.size();
+
+    setSource(source);
+    finishParsing(parameters.releaseBuffer(), count);
+}
+
+void FunctionBodyNode::finishParsing(Identifier* parameters, size_t parameterCount)
+{
+    ASSERT(!source().isNull());
+    m_parameters = parameters;
+    m_parameterCount = parameterCount;
+}
+
+void FunctionBodyNode::mark()
+{
+    if (m_code)
+        m_code->mark();
+}
+
+FunctionBodyNode* FunctionBodyNode::create(JSGlobalData* globalData)
+{
+    return new FunctionBodyNode(globalData);
+}
+
+FunctionBodyNode* FunctionBodyNode::create(JSGlobalData* globalData, SourceElements* children, VarStack* varStack, FunctionStack* funcStack, const SourceCode& sourceCode, CodeFeatures features, int numConstants)
+{
+    return new FunctionBodyNode(globalData, children, varStack, funcStack, sourceCode, features, numConstants);
+}
+
+void FunctionBodyNode::generateBytecode(ScopeChainNode* scopeChainNode)
+{
+    // This branch is only necessary since you can still create a non-stub FunctionBodyNode by
+    // calling Parser::parse<FunctionBodyNode>().   
+    if (!data())
+        scopeChainNode->globalData->parser->reparseInPlace(scopeChainNode->globalData, this);
+    ASSERT(data());
+
+    ScopeChain scopeChain(scopeChainNode);
+    JSGlobalObject* globalObject = scopeChain.globalObject();
+
+    m_code.set(new CodeBlock(this, FunctionCode, source().provider(), source().startOffset()));
+
+    BytecodeGenerator generator(this, globalObject->debugger(), scopeChain, &m_code->symbolTable(), m_code.get());
+    generator.generate();
+
+    destroyData();
+}
+
+CodeBlock& FunctionBodyNode::bytecodeForExceptionInfoReparse(ScopeChainNode* scopeChainNode, CodeBlock* codeBlockBeingRegeneratedFrom)
+{
+    ASSERT(!m_code);
+
+    ScopeChain scopeChain(scopeChainNode);
+    JSGlobalObject* globalObject = scopeChain.globalObject();
+
+    m_code.set(new CodeBlock(this, FunctionCode, source().provider(), source().startOffset()));
+
+    BytecodeGenerator generator(this, globalObject->debugger(), scopeChain, &m_code->symbolTable(), m_code.get());
+    generator.setRegeneratingForExceptionInfo(codeBlockBeingRegeneratedFrom);
+    generator.generate();
+
+    return *m_code;
+}
+
+RegisterID* FunctionBodyNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
+{
+    generator.emitDebugHook(DidEnterCallFrame, firstLine(), lastLine());
+    statementListEmitCode(children(), generator, generator.ignoredResult());
+    if (children().size() && children().last()->isBlock()) {
+        BlockNode* blockNode = static_cast<BlockNode*>(children().last().get());
+        if (blockNode->children().size() && blockNode->children().last()->isReturnNode())
+            return 0;
+    }
+
+    RegisterID* r0 = generator.emitLoad(0, jsUndefined());
+    generator.emitDebugHook(WillLeaveCallFrame, firstLine(), lastLine());
+    generator.emitReturn(r0);
+    return 0;
+}
+
+UString FunctionBodyNode::paramString() const
+{
+    UString s("");
+    for (size_t pos = 0; pos < m_parameterCount; ++pos) {
+        if (!s.isEmpty())
+            s += ", ";
+        s += parameters()[pos].ustring();
+    }
+
+    return s;
+}
+
+Identifier* FunctionBodyNode::copyParameters()
+{
+    Identifier* parameters = static_cast<Identifier*>(fastMalloc(m_parameterCount * sizeof(Identifier)));
+    VectorCopier<false, Identifier>::uninitializedCopy(m_parameters, m_parameters + m_parameterCount, parameters);
+    return parameters;
+}
+
+// ------------------------------ FuncDeclNode ---------------------------------
+
+FuncDeclNode::~FuncDeclNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void FuncDeclNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_parameter);
+    releaser.release(m_body);
+}
+
+JSFunction* FuncDeclNode::makeFunction(ExecState* exec, ScopeChainNode* scopeChain)
+{
+    return new (exec) JSFunction(exec, m_ident, m_body.get(), scopeChain);
+}
+
+RegisterID* FuncDeclNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    if (dst == generator.ignoredResult())
+        dst = 0;
+    return dst;
+}
+
+// ------------------------------ FuncExprNode ---------------------------------
+
+FuncExprNode::~FuncExprNode()
+{
+    NodeReleaser::releaseAllNodes(this);
+}
+
+void FuncExprNode::releaseNodes(NodeReleaser& releaser)
+{
+    releaser.release(m_parameter);
+    releaser.release(m_body);
+}
+
+RegisterID* FuncExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
+{
+    return generator.emitNewFunctionExpression(generator.finalDestination(dst), this);
+}
+
+JSFunction* FuncExprNode::makeFunction(ExecState* exec, ScopeChainNode* scopeChain)
+{
+    JSFunction* func = new (exec) JSFunction(exec, m_ident, m_body.get(), scopeChain);
+
+    /* 
+        The Identifier in a FunctionExpression can be referenced from inside
+        the FunctionExpression's FunctionBody to allow the function to call
+        itself recursively. However, unlike in a FunctionDeclaration, the
+        Identifier in a FunctionExpression cannot be referenced from and
+        does not affect the scope enclosing the FunctionExpression.
+     */
+
+    if (!m_ident.isNull()) {
+        JSStaticScopeObject* functionScopeObject = new (exec) JSStaticScopeObject(exec, m_ident, func, ReadOnly | DontDelete);
+        func->scope().push(functionScopeObject);
+    }
+
+    return func;
+}
+
+} // namespace JSC