nodes.cpp

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    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)