Introduce experimental binding optimizer

Enable with QML_EXPERIMENTAL=1

13 files changed, 1818 insertions, 7 deletions

diff --git a/src/declarative/qml/qml.pri b/src/declarative/qml/qml.pri
index 1155a36..172146c 100644
--- a/src/declarative/qml/qml.pri
+++ b/src/declarative/qml/qml.pri
@@ -32,6 +32,7 @@ SOURCES += \
     $$PWD/qmlenginedebug.cpp \
     $$PWD/qmlrewrite.cpp \
     $$PWD/qmlbasicscript.cpp \
+    $$PWD/qmlbindingvme.cpp \
     $$PWD/qmlvaluetype.cpp \
     $$PWD/qmlbindingoptimizations.cpp \
     $$PWD/qmlxmlhttprequest.cpp \
@@ -94,6 +95,7 @@ HEADERS += \
     $$PWD/qmlerror.h \
     $$PWD/qmlscriptparser_p.h \
     $$PWD/qmlbasicscript_p.h \
+    $$PWD/qmlbindingvme_p.h \
     $$PWD/qmlenginedebug_p.h \
     $$PWD/qmlrewrite_p.h \
     $$PWD/qpodvector_p.h \
diff --git a/src/declarative/qml/qmlbasicscript.cpp b/src/declarative/qml/qmlbasicscript.cpp
index 6a32df7..b596437 100644
--- a/src/declarative/qml/qmlbasicscript.cpp
+++ b/src/declarative/qml/qmlbasicscript.cpp
@@ -121,6 +121,16 @@ public:
     }
 };
 
+// anchors.left: (nop convert)(qobject)parent.(anchorline)right
+
+/*
+    Property chains: a.b.c.d
+    if else value selection statements: if(a) b else if(c) d else e
+    trinary selection: a?b:c
+    addition: a + b
+    negation: a - a
+    equality: ==
+*/
 static QVariant fetch_value(QObject *o, int idx, int type)
 {
     if (!o)
diff --git a/src/declarative/qml/qmlbindingoptimizations.cpp b/src/declarative/qml/qmlbindingoptimizations.cpp
index 0f2e199..120e07b 100644
--- a/src/declarative/qml/qmlbindingoptimizations.cpp
+++ b/src/declarative/qml/qmlbindingoptimizations.cpp
@@ -42,9 +42,96 @@
 #include "qmlbindingoptimizations_p.h"
 
 #include "qmlcontext_p.h"
+#include <QtDeclarative/qmlinfo.h>
+#include "qmlbindingvme_p.h"
 
 QT_BEGIN_NAMESPACE
 
+int QmlBinding_Basic::reevalIndex = -1;
+
+QmlBinding_Basic::QmlBinding_Basic(QObject *target, int property,
+                                   const char *data, QmlRefCount *ref,
+                                   QObject *scope, QmlContext *context)
+: m_enabled(false), m_updating(false), m_scope(scope), m_target(target), 
+  m_property(property), m_data(data)
+{
+    if (reevalIndex == -1) 
+        reevalIndex = QmlBinding_Basic::staticMetaObject.indexOfSlot("reeval()");
+
+    m_config.target = this;
+    m_config.targetSlot = reevalIndex;
+    m_scope2 = m_scope;
+
+    QmlAbstractExpression::setContext(context);
+}
+
+QmlBinding_Basic::~QmlBinding_Basic()
+{
+}
+
+void QmlBinding_Basic::setEnabled(bool e, QmlMetaProperty::WriteFlags flags)
+{
+    if (e) {
+        addToObject(m_target);
+        update(flags);
+    } else {
+        removeFromObject();
+    }
+
+    QmlAbstractBinding::setEnabled(e, flags);
+
+    if (m_enabled != e) {
+        m_enabled = e;
+
+        if (e) update(flags);
+    }
+}
+
+int QmlBinding_Basic::propertyIndex()
+{
+    return m_property & 0xFFFF;
+}
+
+void QmlBinding_Basic::update(QmlMetaProperty::WriteFlags flags)
+{
+    if (!m_enabled)
+        return;
+
+    if (m_updating) {
+        qmlInfo(m_target) << tr("Binding loop detected");
+        return;
+    }
+
+    QmlContext *context = QmlAbstractExpression::context();
+    if (!context)
+        return;
+    QmlContextPrivate *cp = QmlContextPrivate::get(context);
+
+    m_updating = true;
+
+    if (m_property & 0xFFFF0000) {
+        QmlEnginePrivate *ep = QmlEnginePrivate::get(cp->engine);
+
+        QmlValueType *vt = ep->valueTypes[(m_property >> 16) & 0xFF];
+        Q_ASSERT(vt);
+        vt->read(m_target, m_property & 0xFFFF);
+
+        QObject *target = vt;
+        QmlBindingVME::run(m_data, &m_config, cp, &m_scope, &target);
+
+        vt->write(m_target, m_property & 0xFFFF, flags);
+    } else {
+        QmlBindingVME::run(m_data, &m_config, cp, &m_scope, &m_target);
+    }
+
+    m_updating = false;
+}
+
+void QmlBinding_Basic::reeval()
+{
+    update(QmlMetaProperty::DontRemoveBinding);
+}
+
 /*
     The QmlBinding_Id optimization handles expressions of the type:
 
diff --git a/src/declarative/qml/qmlbindingoptimizations_p.h b/src/declarative/qml/qmlbindingoptimizations_p.h
index 4ce145d..ee2eb83 100644
--- a/src/declarative/qml/qmlbindingoptimizations_p.h
+++ b/src/declarative/qml/qmlbindingoptimizations_p.h
@@ -55,11 +55,45 @@
 
 #include "qmlexpression_p.h"
 #include "qmlbinding.h"
+#include "qmlbasicscript_p.h"
+#include "qmlbindingvme_p.h"
 
 QT_BEGIN_HEADER
 
 QT_BEGIN_NAMESPACE
 
+class QmlBinding_Basic : public QObject,
+                         public QmlAbstractExpression,
+                         public QmlAbstractBinding
+{
+    Q_OBJECT
+public:
+    QmlBinding_Basic(QObject *target, int property,
+                     const char *data, QmlRefCount *ref,
+                     QObject *scope, QmlContext *context);
+    virtual ~QmlBinding_Basic();
+
+    // Inherited from QmlAbstractBinding
+    virtual void setEnabled(bool, QmlMetaProperty::WriteFlags flags);
+    virtual int propertyIndex();
+    virtual void update(QmlMetaProperty::WriteFlags flags);
+
+private slots:
+    void reeval();
+
+private:
+    bool m_enabled:1;
+    bool m_updating:1;
+    QObject *m_scope;
+    QObject *m_target;
+    int m_property;
+    const char *m_data;
+    QmlBindingVME::Config m_config;
+    QGuard<QObject> m_scope2;
+
+    static int reevalIndex;
+};
+
 class QmlBinding_Id : public QmlAbstractExpression, 
                       public QmlAbstractBinding
 {
diff --git a/src/declarative/qml/qmlbindingvme.cpp b/src/declarative/qml/qmlbindingvme.cpp
new file mode 100644
index 0000000..26dd303
--- /dev/null
+++ b/src/declarative/qml/qmlbindingvme.cpp
@@ -0,0 +1,1519 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmlbindingvme_p.h"
+#include <private/qmlcontext_p.h>
+#include <private/qmljsast_p.h>
+#include <private/qmljsengine_p.h>
+#include <QtCore/qdebug.h>
+#include <private/qmlgraphicsanchors_p_p.h>
+
+QT_BEGIN_NAMESPACE
+
+using namespace QmlJS;
+
+namespace {
+// Supported types: int, qreal, QString (needs constr/destr), QObject*, bool
+struct Register {
+    void setQObject(QObject *o) { *((QObject **)data) = o; }
+    QObject *getQObject() { return *((QObject **)data); }
+
+    void setqreal(qreal v) { *((qreal *)data) = v; }
+    qreal getqreal() { return *((qreal *)data); }
+
+    void setint(int v) { *((int *)data) = v; }
+    int getint() { return *((int *)data); }
+
+    void setbool(bool v) { *((bool *)data) = v; }
+    bool getbool() { return *((bool *)data); }
+
+    QVariant *getvariantptr() { return (QVariant *)typeDataPtr(); }
+
+    void *typeDataPtr() { return (void *)&data; }
+    void *typeMemory() { return (void *)data; }
+
+    void *data[2];     // Object stored here
+};
+
+struct Instr {
+    enum {
+        Init,                    // init
+
+        Subscribe,               // subscribe
+        SubscribeId,             // subscribe
+
+        LoadId,                  // load
+        LoadScope,               // load
+        LoadRoot,                // load
+
+        ConvertIntToReal,        // unaryop
+        ConvertRealToInt,        // unaryop
+
+        Real,                    // real_value
+        Int,                     // int_value
+        Bool,                    // bool_value
+
+        AddReal,                 // binaryop
+        AddInt,                  // binaryop
+
+        MinusReal,               // binaryop
+        MinusInt,                // binaryop
+
+        GreaterThanReal,         // binaryop
+
+        NewString,               // construct
+        CleanupString,           // cleanup
+
+        Fetch,                   // fetch
+        Store,                   // store
+
+        Skip,                    // skip
+
+        Done,
+
+        // Speculative property resolution
+        InitString,              // initstring
+        FindGeneric,             // find 
+        FindGenericTerminal,     // find 
+        FindProperty,            // find 
+        FindPropertyTerminal,    // find 
+        CleanupGeneric,          // cleanup
+        ConvertGenericToReal,    // genericunaryop
+        ConvertGenericToString,  // genericunaryop
+
+    } type;
+
+    union {
+        struct {
+            int subscriptions;
+            int identifiers;
+        } init;
+        struct {
+            int offset;
+            int reg;
+            int index;
+        } subscribe;
+        struct {
+            int index;
+            int reg;
+        } load;
+        struct {
+            int output;
+            int index;
+            int reg;
+        } store;
+        struct {
+            int output;
+            int objectReg;
+            int index;
+        } fetch;
+        struct {
+            int reg;
+        } construct;
+        struct {
+            int reg;
+            qreal value;
+        } real_value;
+        struct {
+            int reg;
+            int value;
+        } int_value;
+        struct {
+            int reg;
+            bool value;
+        } bool_value;
+        struct {
+            int output;
+            int src1;
+            int src2;
+        } binaryop;
+        struct {
+            int output;
+            int src;
+        } unaryop;
+        struct {
+            int output;
+            int src;
+            int srcType;
+        } genericunaryop;
+        struct {
+            int reg;
+            int count;
+        } skip;
+        struct {
+            int reg;
+            int src;
+            int typeReg;
+            int name; 
+            int subscribeIndex;
+        } find;
+        struct {
+            int reg;
+            int typeReg;
+        } cleanup;
+        struct {
+            int offset;
+            int dataIdx;
+            int length;
+        } initstring;
+    };
+};
+
+struct Program {
+    int dataLength;
+    const char *data() const { return ((const char *)this) + sizeof(Program); }
+    const Instr *instructions() const { return (const Instr *)(data() + dataLength); }
+};
+}
+
+struct QmlBindingCompiler
+{
+    struct Result {
+        Result() : unknownType(false), metaObject(0), type(-1), reg(-1) {}
+        bool operator==(const Result &o) const { 
+            return unknownType == o.unknownType &&
+                   metaObject == o.metaObject && 
+                   type == o.type &&
+                   reg == o.reg; 
+        }
+        bool operator!=(const Result &o) const { 
+            return !(*this == o);
+        }
+        bool unknownType;
+        const QMetaObject *metaObject;
+        int type;
+        int reg;
+    };
+
+    QmlBindingCompiler() : registers(0), strings(0) {}
+    void reset();
+
+    QmlParser::Object *context;
+    QmlParser::Object *component;
+    QmlParser::Property *destination;
+    QHash<QString, QmlParser::Object *> ids;
+
+    bool compile(QmlJS::AST::Node *);
+
+    bool parseExpression(QmlJS::AST::Node *, Result &);
+
+    bool tryName(QmlJS::AST::Node *);
+    bool parseName(QmlJS::AST::Node *, Result &);
+
+    bool tryArith(QmlJS::AST::Node *);
+    bool parseArith(QmlJS::AST::Node *, Result &);
+
+    bool tryLogic(QmlJS::AST::Node *);
+    bool parseLogic(QmlJS::AST::Node *, Result &);
+
+    bool tryConditional(QmlJS::AST::Node *);
+    bool parseConditional(QmlJS::AST::Node *, Result &);
+
+    bool tryConstant(QmlJS::AST::Node *);
+    bool parseConstant(QmlJS::AST::Node *, Result &);
+
+    bool buildName(QStringList &, QmlJS::AST::Node *);
+    Result fetch(const QMetaObject *, int reg, int idx, const QStringList &);
+
+    quint32 registers;
+    int acquireReg();
+    void releaseReg(int);
+
+    int registerString(const QString &);
+    int strings;
+    QByteArray data;
+
+    QSet<QString> subscriptionSet;
+    bool subscription(const QStringList &);
+    QVector<Instr> bytecode;
+};
+
+QByteArray QmlBindingVME::compile(const QmlBasicScript::Expression &expression)
+{
+    if (!expression.expression.asAST()) return false;
+
+    QmlBindingCompiler bsc;
+    bsc.context = expression.context;
+    bsc.component = expression.component;
+    bsc.destination = expression.property;
+    bsc.ids = expression.ids;
+
+    bool ok = bsc.compile(expression.expression.asAST());
+
+    if (ok) {
+        Program prog;
+        prog.dataLength = 4 * ((bsc.data.size() + 3) / 4);
+        int size = sizeof(Program) + bsc.bytecode.count() * sizeof(Instr);
+        size += prog.dataLength;
+
+        QByteArray data;
+        data.resize(size);
+        memcpy(data.data(), &prog, sizeof(Program));
+        if (prog.dataLength)
+            memcpy((char *)((Program *)data.data())->data(), bsc.data.constData(),
+                   bsc.data.size());
+        memcpy((char *)((Program *)data.data())->instructions(), bsc.bytecode.constData(), 
+               bsc.bytecode.count() * sizeof(Instr));
+        return data;
+    } else {
+        return QByteArray();
+    }
+}
+
+inline void subscribe(QObject *o, int notifyIndex, QmlBindingVME::Config::Subscription *s, 
+                      QmlBindingVME::Config *config)
+{
+    if (o != s->source || notifyIndex != s->notifyIndex)  {
+        if (s->source)
+            QMetaObject::disconnect(s->source, s->notifyIndex, 
+                                    config->target, config->targetSlot);
+        s->source = o;
+        s->notifyIndex = notifyIndex;
+        if (s->source && s->notifyIndex != -1)
+            QMetaObject::connect(s->source, s->notifyIndex, config->target, 
+                                 config->targetSlot, Qt::DirectConnection);
+    } 
+}
+
+static QObject *variantToQObject(const QVariant &value, bool *ok)
+{
+    *ok = false;
+    Q_UNUSED(value);
+    return 0;
+}
+
+static QmlPropertyCache::Data *findproperty(QObject *obj, 
+                                            const QScriptDeclarativeClass::Identifier &name,
+                                            QmlEnginePrivate *enginePriv,
+                                            QmlPropertyCache::Data &local)
+{
+    QmlPropertyCache *cache = 0;
+    QmlDeclarativeData *ddata = QmlDeclarativeData::get(obj);
+    if (ddata)
+        cache = ddata->propertyCache;
+    if (!cache) {
+        cache = enginePriv->cache(obj);
+        if (cache && ddata) { cache->addref(); ddata->propertyCache = cache; }
+    }
+
+    QmlPropertyCache::Data *property = 0;
+
+    if (cache) {
+        property = cache->property(name);
+    } else {
+        qWarning() << "QmlBindingVME: Slow search" << enginePriv->objectClass->toString(name);
+        local = QmlPropertyCache::create(obj->metaObject(),  
+                                         enginePriv->objectClass->toString(name));
+        if (local.isValid())
+            property = &local;
+    }
+
+    return property;
+}
+
+static bool findproperty(QObject *obj, 
+                         Register *output, Register *type, 
+                         QmlEnginePrivate *enginePriv,
+                         QmlBindingVME::Config *config, int subIdx,
+                         const QScriptDeclarativeClass::Identifier &name,
+                         bool isTerminal)
+{
+    QmlPropertyCache::Data local;
+    QmlPropertyCache::Data *property = findproperty(obj, name, enginePriv, local);
+
+    if (property) {
+        if (property->flags & QmlPropertyCache::Data::IsQObjectDerived) {
+            void *args[] = { output->typeDataPtr(), 0 };
+            QMetaObject::metacall(obj, QMetaObject::ReadProperty, property->coreIndex, args);
+            type->setint(QMetaType::QObjectStar);
+        } else if (property->propType == qMetaTypeId<QVariant>()) {
+            QVariant v;
+            void *args[] = { &v, 0 };
+            QMetaObject::metacall(obj, QMetaObject::ReadProperty, property->coreIndex, args);
+
+            if (isTerminal) {
+                new (output->typeDataPtr()) QVariant(v);
+                type->setint(qMetaTypeId<QVariant>());
+            } else {
+                bool ok;
+                output->setQObject(variantToQObject(v, &ok));
+                if (!ok) return false;
+                type->setint(QMetaType::QObjectStar);
+            }
+
+        } else {
+            if (!isTerminal)
+                return false;
+
+            if (property->propType == QMetaType::QReal) {
+                void *args[] = { output->typeDataPtr(), 0 };
+                QMetaObject::metacall(obj, QMetaObject::ReadProperty, property->coreIndex, args);
+                type->setint(QMetaType::QReal);
+            } else {
+                new (output->typeDataPtr()) 
+                    QVariant(obj->metaObject()->property(property->coreIndex).read(obj));
+                type->setint(qMetaTypeId<QVariant>());
+            }
+
+        }
+
+        if (subIdx != -1)
+            subscribe(obj, property->notifyIndex, config->subscriptions + subIdx, config);
+
+        return true;
+    } else {
+        return false;
+    }
+}
+
+static bool findproperty(Register *input, 
+                         Register *output, Register *type, 
+                         QmlEnginePrivate *enginePriv,
+                         QmlBindingVME::Config *config, int subIdx,
+                         const QScriptDeclarativeClass::Identifier &name,
+                         bool isTerminal)
+{
+    return findproperty(input->getQObject(), output, type, enginePriv, 
+                        config, subIdx, name, isTerminal);
+}
+
+static bool findgeneric(Register *output,                                 // value output
+                        Register *type,                                   // value type output
+                        QmlBindingVME::Config *config,           
+                        int subIdx,                                       // Subscription index in config
+                        QmlContextPrivate *context,                       // Context to search in
+                        const QScriptDeclarativeClass::Identifier &name, 
+                        bool isTerminal)
+{
+    QmlEnginePrivate *enginePriv = QmlEnginePrivate::get(context->engine);
+
+    while (context) {
+
+        int contextPropertyIndex = context->propertyNames?context->propertyNames->value(name):-1;
+        if (contextPropertyIndex != -1) {
+
+            if (contextPropertyIndex < context->idValueCount) {
+                output->setQObject(context->idValues[contextPropertyIndex]);
+                type->setint(QMetaType::QObjectStar);
+            } else {
+                const QVariant &value = context->propertyValues.at(contextPropertyIndex);
+                if (isTerminal) {
+                    new (output->typeDataPtr()) QVariant(value);
+                    type->setint(qMetaTypeId<QVariant>());
+                } else {
+                    bool ok;
+                    output->setQObject(variantToQObject(value, &ok));
+                    if (!ok) return false;
+                    type->setint(QMetaType::QObjectStar);
+                }
+            }
+
+            return true;
+        }
+
+        for (int ii = 0; ii < context->scripts.count(); ++ii) {
+            QScriptValue function = QScriptDeclarativeClass::function(context->scripts.at(ii), name);
+            if (function.isValid()) {
+                qFatal("Binding optimizer resolved name to QScript method");
+                return false;
+            }
+        }
+
+        if (QObject *root = context->defaultObjects.isEmpty()?0:context->defaultObjects.first()) {
+
+            if (findproperty(root, output, type, enginePriv, config, subIdx, name, isTerminal))
+                return true;
+
+        }
+
+        if (context->parent) {
+            context = QmlContextPrivate::get(context->parent);
+        } else {
+            context = 0;
+        }
+    }
+
+    return false;
+}
+
+
+// Conversion functions
+inline static qreal toReal(Register *reg, int type, bool *ok = 0)
+{
+    if (ok) *ok = true;
+
+    if (type == QMetaType::QReal) {
+        return reg->getqreal();
+    } else if (type == qMetaTypeId<QVariant>()) {
+        *ok = true;
+        return reg->getvariantptr()->toReal();
+    } else {
+        if (ok) *ok = false;
+        return 0;
+    }
+}
+
+inline static QString toString(Register *reg, int type, bool *ok = 0)
+{
+    if (ok) *ok = true;
+
+    if (type == QMetaType::QReal) {
+        return QString::number(reg->getqreal());
+    } else if (type == qMetaTypeId<QVariant>()) {
+        return reg->getvariantptr()->toString();
+    } else {
+        if (ok) *ok = false;
+        return QString();
+    }
+}
+
+inline static bool toBool(Register *reg, int type, bool *ok = 0)
+{
+    if (ok) *ok = true;
+
+    if (type == QMetaType::Bool) {
+        return reg->getbool();
+    } else if (type == qMetaTypeId<QVariant>()) {
+        return reg->getvariantptr()->toBool();
+    } else {
+        if (ok) *ok = false;
+        return false;
+    }
+}
+
+inline static QUrl toUrl(Register *reg, int type, QmlContextPrivate *context, bool *ok = 0)
+{
+    if (ok) *ok = true;
+
+    QUrl base;
+    if (type == qMetaTypeId<QVariant>()) {
+        QVariant *var = reg->getvariantptr();
+        int vt = var->type();
+        if (vt == QVariant::Url) {
+            base = var->toUrl();
+        } else if (vt == QVariant::ByteArray) {
+            base = QUrl(QString::fromUtf8(var->toByteArray()));
+        } else if (vt == QVariant::String) {
+            base = QUrl(var->toString());
+        } else {
+            if (ok) *ok = false;
+            return QUrl();
+        }
+    } else { 
+        if (ok) *ok = false;
+        return QUrl();
+    }
+
+    return QUrl();
+}
+
+void QmlBindingVME::run(const char *programData, Config *config, 
+                        QmlContextPrivate *context, 
+                        QObject **scopes, QObject **outputs)
+{
+    Register registers[32];
+    int storeFlags = 0;
+
+    QmlEnginePrivate *engine = QmlEnginePrivate::get(context->engine);
+    Program *program = (Program *)programData;
+    const Instr *instr = program->instructions();
+    const char *data = program->data();
+
+    while (instr) {
+
+    switch (instr->type) {
+    case Instr::Init:
+        if (!config->subscriptions && instr->init.subscriptions)
+            config->subscriptions = new Config::Subscription[instr->init.subscriptions];
+        if (!config->identifiers && instr->init.identifiers)
+            config->identifiers = new QScriptDeclarativeClass::PersistentIdentifier[instr->init.identifiers];
+        break;
+
+    case Instr::SubscribeId:
+    case Instr::Subscribe:
+        {
+            QObject *o = registers[instr->subscribe.reg].getQObject();
+            Config::Subscription *s = config->subscriptions + instr->subscribe.offset;
+            int notifyIndex = instr->subscribe.index;
+
+            if (instr->type == Instr::SubscribeId) {
+                o = QmlContextPrivate::get(context);
+                notifyIndex += context->notifyIndex;
+            }
+
+            subscribe(o, instr->subscribe.index, s, config);
+        }
+        break;
+
+    case Instr::LoadId:
+        registers[instr->load.reg].setQObject(context->idValues[instr->load.index].data());
+        break;
+
+    case Instr::LoadScope:
+        registers[instr->load.reg].setQObject(scopes[instr->load.index]);
+        break;
+
+    case Instr::LoadRoot:
+        registers[instr->load.reg].setQObject(context->defaultObjects.at(0));
+        break;
+
+    case Instr::ConvertIntToReal:
+        registers[instr->unaryop.output].setqreal(qreal(registers[instr->unaryop.src].getint()));
+        break;
+
+    case Instr::ConvertRealToInt:
+        registers[instr->unaryop.output].setint(int(registers[instr->unaryop.src].getqreal()));
+        break;
+
+    case Instr::Real:
+        registers[instr->real_value.reg].setqreal(instr->real_value.value);
+        break;
+
+    case Instr::Int:
+        registers[instr->int_value.reg].setint(instr->int_value.value);
+        break;
+        
+    case Instr::Bool:
+        registers[instr->bool_value.reg].setbool(instr->bool_value.value);
+        break;
+
+    case Instr::AddReal:
+        registers[instr->binaryop.output].setqreal(registers[instr->binaryop.src1].getqreal() + 
+                                                   registers[instr->binaryop.src2].getqreal());
+        break;
+
+    case Instr::AddInt:
+        registers[instr->binaryop.output].setint(registers[instr->binaryop.src1].getint() + 
+                                                 registers[instr->binaryop.src2].getint());
+        break;
+
+    case Instr::MinusReal:
+        registers[instr->binaryop.output].setqreal(registers[instr->binaryop.src1].getqreal() - 
+                                                   registers[instr->binaryop.src2].getqreal());
+        break;
+
+    case Instr::MinusInt:
+        registers[instr->binaryop.output].setint(registers[instr->binaryop.src1].getint() - 
+                                                 registers[instr->binaryop.src2].getint());
+        break;
+
+    case Instr::GreaterThanReal:
+        registers[instr->binaryop.output].setbool(registers[instr->binaryop.src1].getqreal() > 
+                                                  registers[instr->binaryop.src2].getqreal());
+        break;
+
+    case Instr::NewString:
+        new (registers[instr->construct.reg].typeMemory()) QString;
+        break;
+
+    case Instr::CleanupString:
+        ((QString *)(registers[instr->cleanup.reg].typeDataPtr()))->~QString();
+        break;
+
+    case Instr::Fetch:
+        {
+            QObject *object = registers[instr->fetch.objectReg].getQObject();
+            if (!object) {
+                qWarning() << "ERROR - Fetch";
+                return; 
+            }
+            void *argv[] = { registers[instr->fetch.output].typeDataPtr(), 0 };
+            QMetaObject::metacall(object, QMetaObject::ReadProperty, instr->fetch.index, argv);
+        }
+        break;
+
+    case Instr::Store:
+        {
+            int status = -1;
+            void *argv[] = { registers[instr->store.reg].typeDataPtr(),
+                             0, &status, &storeFlags };
+            QMetaObject::metacall(outputs[instr->store.output], QMetaObject::WriteProperty, 
+                                  instr->store.index, argv);
+        }
+        break;
+
+    case Instr::Skip:
+        if (instr->skip.reg == -1 || !registers[instr->skip.reg].getbool()) 
+            instr += instr->skip.count;
+        break;
+
+    case Instr::Done:
+        return;
+
+    case Instr::InitString:
+        if (!config->identifiers[instr->initstring.offset].identifier) {
+            QString str = QString::fromRawData((QChar *)(data + instr->initstring.dataIdx), 
+                                               instr->initstring.length);
+            config->identifiers[instr->initstring.offset] = 
+                engine->objectClass->createPersistentIdentifier(str);
+        }
+        break;
+
+    case Instr::FindGenericTerminal:
+    case Instr::FindGeneric:
+        // We start the search in the parent context, as we know that the 
+        // name is not present in the current context or it would have been
+        // found during the static compile
+        if (!findgeneric(registers + instr->find.reg, registers + instr->find.typeReg,
+                         config, instr->find.subscribeIndex, QmlContextPrivate::get(context->parent),
+                         config->identifiers[instr->find.name].identifier, 
+                         instr->type == Instr::FindGenericTerminal)) {
+            qWarning() << "ERROR - FindGeneric*";
+            return;
+        }
+        break;
+
+    case Instr::FindPropertyTerminal:
+    case Instr::FindProperty:
+        if (!findproperty(registers + instr->find.src,
+                          registers + instr->find.reg, registers + instr->find.typeReg,
+                          QmlEnginePrivate::get(context->engine),
+                          config, instr->find.subscribeIndex, 
+                          config->identifiers[instr->find.name].identifier, 
+                          instr->type == Instr::FindPropertyTerminal)) {
+            qWarning() << "ERROR - FindProperty*";
+            return;
+        }
+        break;
+
+    case Instr::CleanupGeneric:
+        {
+            int type = registers[instr->cleanup.typeReg].getint();
+            if (type == qMetaTypeId<QVariant>()) {
+                ((QVariant *)registers[instr->cleanup.reg].typeDataPtr())->~QVariant();
+            }
+        }
+        break;
+
+    case Instr::ConvertGenericToReal:
+        {
+            int type = registers[instr->genericunaryop.srcType].getint();
+            registers[instr->genericunaryop.output].setqreal(toReal(registers + instr->genericunaryop.src, type));
+        }
+        break;
+
+    case Instr::ConvertGenericToString:
+        {
+            int type = registers[instr->genericunaryop.srcType].getint();
+            void *regPtr = registers[instr->genericunaryop.output].typeDataPtr();
+            new (regPtr) QString(toString(registers + instr->genericunaryop.src, type));
+        }
+        break;
+
+    default:
+        qFatal("EEK");
+        break;
+    }
+
+    instr++;
+    }
+}
+
+void QmlBindingVME::dump(const QByteArray &programData)
+{
+    const Program *program = (const Program *)programData.constData();
+
+    int count = (programData.size() - sizeof(Program) - program->dataLength) / sizeof(Instr);
+    const Instr *instr = program->instructions();
+
+    while (count--) {
+
+        switch (instr->type) {
+        case Instr::Init:
+            qWarning().nospace() << "Init" << "\t\t\t" << instr->init.subscriptions << "\t" << instr->init.identifiers;
+            break;
+        case Instr::Subscribe:
+            qWarning().nospace() << "Subscribe" << "\t\t" << instr->subscribe.offset << "\t" << instr->subscribe.reg << "\t" << instr->subscribe.index;
+            break;
+        case Instr::SubscribeId:
+            qWarning().nospace() << "SubscribeId" << "\t\t" << instr->subscribe.offset << "\t" << instr->subscribe.reg << "\t" << instr->subscribe.index;
+            break;
+        case Instr::LoadId:
+            qWarning().nospace() << "LoadId" << "\t\t\t" << instr->load.index << "\t" << instr->load.reg;
+            break;
+        case Instr::LoadScope:
+            qWarning().nospace() << "LoadScope" << "\t\t" << instr->load.index << "\t" << instr->load.reg;
+            break;
+        case Instr::LoadRoot:
+            qWarning().nospace() << "LoadRoot" << "\t\t" << instr->load.index << "\t" << instr->load.reg;
+            break;
+        case Instr::ConvertIntToReal:
+            qWarning().nospace() << "ConvertIntToReal" << "\t" << instr->unaryop.output << "\t" << instr->unaryop.src;
+            break;
+        case Instr::ConvertRealToInt:
+            qWarning().nospace() << "ConvertRealToInt" << "\t" << instr->unaryop.output << "\t" << instr->unaryop.src;
+            break;
+        case Instr::Real:
+            qWarning().nospace() << "Real" << "\t\t\t" << instr->real_value.reg << "\t" << instr->real_value.value;
+            break;
+        case Instr::Int:
+            qWarning().nospace() << "Int" << "\t\t\t" << instr->int_value.reg << "\t" << instr->int_value.value;
+            break;
+        case Instr::Bool:
+            qWarning().nospace() << "Bool" << "\t\t\t" << instr->bool_value.reg << "\t" << instr->bool_value.value;
+            break;
+        case Instr::AddReal:
+            qWarning().nospace() << "AddReal" << "\t\t\t" << instr->binaryop.output << "\t" << instr->binaryop.src1 << "\t" << instr->binaryop.src2;
+            break;
+        case Instr::AddInt:
+            qWarning().nospace() << "AddInt" << "\t\t\t" << instr->binaryop.output << "\t" << instr->binaryop.src1 << "\t" << instr->binaryop.src2;
+            break;
+        case Instr::MinusReal:
+            qWarning().nospace() << "MinusReal" << "\t\t" << instr->binaryop.output << "\t" << instr->binaryop.src1 << "\t" << instr->binaryop.src2;
+            break;
+        case Instr::MinusInt:
+            qWarning().nospace() << "MinusInt" << "\t\t" << instr->binaryop.output << "\t" << instr->binaryop.src1 << "\t" << instr->binaryop.src2;
+            break;
+        case Instr::GreaterThanReal:
+            qWarning().nospace() << "GreaterThanReal" << "\t\t" << instr->binaryop.output << "\t" << instr->binaryop.src1 << "\t" << instr->binaryop.src2;
+            break;
+        case Instr::NewString:
+            qWarning().nospace() << "NewString" << "\t\t" << instr->construct.reg;
+            break;
+        case Instr::CleanupString:
+            qWarning().nospace() << "CleanupString" << "\t\t" << instr->cleanup.reg << "\t" << instr->cleanup.typeReg;
+            break;
+        case Instr::Fetch:
+            qWarning().nospace() << "Fetch" << "\t\t\t" << instr->fetch.output << "\t" << instr->fetch.index << "\t" << instr->fetch.objectReg;
+            break;
+        case Instr::Store:
+            qWarning().nospace() << "Store" << "\t\t\t" << instr->store.output << "\t" << instr->store.index << "\t" << instr->store.reg;
+            break;
+        case Instr::Skip:
+            qWarning().nospace() << "Skip" << "\t\t\t" << instr->skip.reg << "\t" << instr->skip.count;
+            break;
+        case Instr::Done:
+            qWarning().nospace() << "Done";
+            break;
+        case Instr::InitString:
+            qWarning().nospace() << "InitString" << "\t\t" << instr->initstring.offset << "\t" << instr->initstring.dataIdx << "\t" << instr->initstring.length;
+            break;
+        case Instr::FindGeneric:
+            qWarning().nospace() << "FindGeneric" << "\t\t" << instr->find.reg << "\t" << instr->find.typeReg << "\t" << instr->find.name;
+            break;
+        case Instr::FindGenericTerminal:
+            qWarning().nospace() << "FindGenericTerminal" << "\t" << instr->find.reg << "\t" << instr->find.typeReg << "\t" << instr->find.name;
+            break;
+        case Instr::FindProperty:
+            qWarning().nospace() << "FindProperty" << "\t\t" << instr->find.reg << "\t" << instr->find.src << "\t" << instr->find.typeReg << "\t" << instr->find.name;
+            break;
+        case Instr::FindPropertyTerminal:
+            qWarning().nospace() << "FindPropertyTerminal" << "\t\t" << instr->find.reg << "\t" << instr->find.src << "\t" << instr->find.typeReg << "\t" << instr->find.name;
+            break;
+        case Instr::CleanupGeneric:
+            qWarning().nospace() << "CleanupGeneric" << "\t\t" << instr->cleanup.reg << "\t" << instr->cleanup.typeReg;
+            break;
+        case Instr::ConvertGenericToReal:
+            qWarning().nospace() << "ConvertGenericToReal" << "\t" << instr->genericunaryop.output << "\t" << instr->genericunaryop.src << "\t" << instr->genericunaryop.srcType;
+            break;
+        case Instr::ConvertGenericToString:
+            qWarning().nospace() << "ConvertGenericToString" << "\t" << instr->genericunaryop.output << "\t" << instr->genericunaryop.src << "\t" << instr->genericunaryop.srcType;
+            break;
+        default:
+            qWarning().nospace() << "Unknown";
+            break;
+        }
+
+        ++instr;
+    }
+}
+
+void QmlBindingCompiler::reset()
+{
+    registers = 0;
+    strings = 0;
+    data.clear();
+    subscriptionSet.clear();
+    bytecode.clear();
+}
+
+bool QmlBindingCompiler::compile(QmlJS::AST::Node *node)
+{
+    reset();
+
+    Result type;
+
+    if (!parseExpression(node, type)) 
+        return false;
+
+    if (subscriptionSet.count() || strings) {
+        if (subscriptionSet.count() > 0xFFFF ||
+            strings > 0xFFFF)
+            return false;
+
+        Instr init;
+        init.type = Instr::Init;
+        init.init.subscriptions = subscriptionSet.count();
+        init.init.identifiers = strings;
+        bytecode.prepend(init);
+    }
+
+    if (type.unknownType) {
+        if (destination->type != QMetaType::QReal &&
+            destination->type != QVariant::String)
+            return false;
+
+        int convertReg = acquireReg();
+
+        if (destination->type == QMetaType::QReal) {
+            Instr convert;
+            convert.type = Instr::ConvertGenericToReal;
+            convert.genericunaryop.output = convertReg;
+            convert.genericunaryop.src = type.reg;
+            convert.genericunaryop.srcType = 2; // XXX
+            bytecode << convert;
+        } else if (destination->type == QVariant::String) {
+            Instr convert;
+            convert.type = Instr::ConvertGenericToString;
+            convert.genericunaryop.output = convertReg;
+            convert.genericunaryop.src = type.reg;
+            convert.genericunaryop.srcType = 2; // XXX
+            bytecode << convert;
+        }
+
+        Instr cleanup;
+        cleanup.type = Instr::CleanupGeneric;
+        cleanup.cleanup.reg = type.reg;
+        cleanup.cleanup.typeReg = 2; // XXX
+        bytecode << cleanup;
+
+        Instr instr;
+        instr.type = Instr::Store;
+        instr.store.output = 0;
+        instr.store.index = destination->index;
+        instr.store.reg = convertReg;
+        bytecode << instr;
+
+        if (destination->type == QVariant::String) {
+            Instr cleanup;
+            cleanup.type = Instr::CleanupString;
+            cleanup.cleanup.reg = convertReg;
+            cleanup.cleanup.typeReg = -1;
+            bytecode << cleanup;
+        }
+
+        releaseReg(convertReg);
+
+        Instr done;
+        done.type = Instr::Done;
+        bytecode << done;
+
+        return true;
+    } else {
+        // Can we store the final value?
+        if (type.type == QVariant::Int &&
+            destination->type == QMetaType::QReal) {
+            Instr instr;
+            instr.type = Instr::ConvertIntToReal;
+            instr.unaryop.output = type.reg;
+            instr.unaryop.src = type.reg;
+            bytecode << instr;
+            type.type = QMetaType::QReal;
+        } else if (type.type == QMetaType::QReal &&
+                   destination->type == QVariant::Int) {
+            Instr instr;
+            instr.type = Instr::ConvertRealToInt;
+            instr.unaryop.output = type.reg;
+            instr.unaryop.src = type.reg;
+            bytecode << instr;
+            type.type = QVariant::Int;
+        } else if (type.type == destination->type) {
+        } else {
+            const QMetaObject *from = type.metaObject;
+            const QMetaObject *to = QmlMetaType::rawMetaObjectForType(destination->type);
+
+            if (QmlMetaPropertyPrivate::canConvert(from, to))
+                type.type = destination->type;
+        }
+
+        if (type.type == destination->type) {
+            Instr instr;
+            instr.type = Instr::Store;
+            instr.store.output = 0;
+            instr.store.index = destination->index;
+            instr.store.reg = type.reg;
+            bytecode << instr;
+
+            Instr done;
+            done.type = Instr::Done;
+            bytecode << done;
+
+            return true;
+        } else {
+            return false;
+        }
+    }
+}
+
+bool QmlBindingCompiler::parseExpression(QmlJS::AST::Node *node, Result &type)
+{
+    while (node->kind == AST::Node::Kind_NestedExpression)
+        node = static_cast<AST::NestedExpression *>(node)->expression;
+
+    if (tryArith(node)) {
+        if (!parseArith(node, type)) return false;
+    } else if (tryLogic(node)) {
+        if (!parseLogic(node, type)) return false;
+    } else if (tryConditional(node)) {
+        if (!parseConditional(node, type)) return false;
+    } else if (tryName(node)) {
+        if (!parseName(node, type)) return false;
+    } else if (tryConstant(node)) {
+        if (!parseConstant(node, type)) return false;
+    } else {
+        return false;
+    }
+    return true;
+}
+
+bool QmlBindingCompiler::tryName(QmlJS::AST::Node *node)
+{
+    return node->kind == AST::Node::Kind_IdentifierExpression ||
+           node->kind == AST::Node::Kind_FieldMemberExpression;
+}
+
+bool QmlBindingCompiler::parseName(AST::Node *node, Result &type)
+{
+    QStringList nameParts;
+    if (!buildName(nameParts, node))
+        return false;
+
+    int reg = acquireReg();
+    if (reg == -1)
+        return false;
+    type.reg = reg;
+
+    QmlParser::Object *absType = 0;
+
+    QStringList subscribeName;
+
+    for (int ii = 0; ii < nameParts.count(); ++ii) {
+        const QString &name = nameParts.at(ii);
+
+        // We don't handle signal properties or attached properties
+        if (name.length() > 2 && name.startsWith(QLatin1String("on")) &&
+            name.at(2).isUpper())
+            return false;
+        if (name.at(0).isUpper())
+            return false;
+
+
+        if (ii == 0) {
+
+            if (ids.contains(name)) {
+                QmlParser::Object *idObject = ids.value(name);
+                absType = idObject;
+                type.metaObject = absType->metaObject();
+
+                // We check if the id object is the root or 
+                // scope object to avoid a subscription
+                if (idObject == component) {
+                    Instr instr;
+                    instr.type = Instr::LoadRoot;
+                    instr.load.index = 0;
+                    instr.load.reg = reg;
+                    bytecode << instr;
+                } else if (idObject == context) {
+                    Instr instr;
+                    instr.type = Instr::LoadScope;
+                    instr.load.index = 0;
+                    instr.load.reg = reg;
+                    bytecode << instr;
+                } else {
+                    Instr instr;
+                    instr.type = Instr::LoadId;
+                    instr.load.index = idObject->idIndex;
+                    instr.load.reg = reg;
+                    bytecode << instr;
+
+                    subscribeName << QLatin1String("$$$ID_") + name;
+
+                    if (subscription(subscribeName)) {
+                        Instr sub;
+                        sub.type = Instr::SubscribeId;
+                        sub.subscribe.offset = subscriptionSet.count() - 1;
+                        sub.subscribe.reg = reg;
+                        sub.subscribe.index = instr.load.index;
+                        bytecode << sub;
+                    }
+                }
+
+            } else {
+
+                QByteArray utf8Name = name.toUtf8();
+                const char *cname = utf8Name.constData();
+
+                int d0Idx = (context == component)?-1:context->metaObject()->indexOfProperty(cname);
+                int d1Idx = -1;
+                if (d0Idx == -1)
+                    d1Idx = component->metaObject()->indexOfProperty(cname);
+
+                if (d0Idx != -1) {
+                    Instr instr;
+                    instr.type = Instr::LoadScope;
+                    instr.load.index = 0;
+                    instr.load.reg = reg;
+                    bytecode << instr;
+
+                    subscribeName << QLatin1String("$$$Scope");
+                    subscribeName << name;
+
+                    type = fetch(context->metaObject(), reg, d0Idx, subscribeName);
+                } else if(d1Idx != -1) {
+                    Instr instr;
+                    instr.type = Instr::LoadRoot;
+                    instr.load.index = 0;
+                    instr.load.reg = reg;
+                    bytecode << instr;
+
+                    subscribeName << QLatin1String("$$$Root");
+                    subscribeName << name;
+
+                    type = fetch(component->metaObject(), reg, d1Idx, subscribeName);
+                } else {
+                    Instr find;
+                    if (nameParts.count() == 1)
+                        find.type = Instr::FindGenericTerminal;
+                    else
+                        find.type = Instr::FindGeneric;
+
+                    find.find.reg = reg;
+                    find.find.src = -1;
+                    find.find.typeReg = 2; // XXX
+                    find.find.name = registerString(name);
+
+                    subscribeName << QString(QLatin1String("$$$Generic_") + name);
+                    if (subscription(subscribeName)) 
+                        find.find.subscribeIndex = subscriptionSet.count() - 1;
+                    else
+                        find.find.subscribeIndex = -1;
+
+                    bytecode << find;
+                    type.unknownType = true;
+                } 
+
+                if (!type.unknownType && type.type == -1)
+                    return false; // Couldn't fetch that type
+            } 
+
+        } else {
+
+            const QMetaObject *mo = 0;
+            if (absType)
+                mo = absType->metaObject();
+            else if (type.metaObject)
+                mo = type.metaObject;
+
+            QByteArray utf8Name = name.toUtf8();
+            const char *cname = utf8Name.constData();
+            int idx = mo?mo->indexOfProperty(cname):-1;
+            if (absType && idx == -1)
+                return false;
+
+            subscribeName << name;
+
+            if (absType || (mo && mo->property(idx).isFinal())) {
+                absType = 0; 
+                type = fetch(mo, reg, idx, subscribeName);
+                if (type.type == -1)
+                    return false;
+            } else {
+
+                Instr prop;
+                if (ii == nameParts.count() -1 ) 
+                    prop.type = Instr::FindPropertyTerminal;
+                else
+                    prop.type = Instr::FindProperty;
+
+                prop.find.reg = reg;
+                prop.find.src = reg;
+                prop.find.typeReg = 2; // XXX 
+                prop.find.name = registerString(name);
+                if (subscription(subscribeName))
+                    prop.find.subscribeIndex = subscriptionSet.count() - 1;
+                else
+                    prop.find.subscribeIndex = -1;
+
+                type.unknownType = true;
+                type.metaObject = 0;
+                type.type = -1;
+                type.reg = reg;
+                bytecode << prop;
+            }
+        }
+    }
+
+    return true;
+}
+
+bool QmlBindingCompiler::tryArith(QmlJS::AST::Node *node)
+{
+    if (node->kind != AST::Node::Kind_BinaryExpression)
+        return false;
+
+    AST::BinaryExpression *expression = static_cast<AST::BinaryExpression *>(node);
+    if (expression->op == QSOperator::Add ||
+        expression->op == QSOperator::Sub)
+        return true;
+    else
+        return false;
+}
+
+bool QmlBindingCompiler::parseArith(QmlJS::AST::Node *node, Result &type)
+{
+    AST::BinaryExpression *expression = static_cast<AST::BinaryExpression *>(node);
+
+    Result lhs;
+    Result rhs;
+
+    if (!parseExpression(expression->left, lhs)) return false;
+    if (!parseExpression(expression->right, rhs)) return false;
+
+    if (lhs.type != QVariant::Int &
+        lhs.type != QMetaType::QReal)
+        return false;
+
+    if (rhs.type != QVariant::Int &
+        rhs.type != QMetaType::QReal)
+        return false;
+
+    bool nativeReal = rhs.type == QMetaType::QReal ||
+                      lhs.type == QMetaType::QReal;
+
+
+    if (nativeReal && lhs.type == QMetaType::Int) {
+        Instr convert;
+        convert.type = Instr::ConvertIntToReal;
+        convert.unaryop.output = lhs.reg;
+        convert.unaryop.src = lhs.reg;
+        bytecode << convert;
+    }
+
+    if (nativeReal && rhs.type == QMetaType::Int) {
+        Instr convert;
+        convert.type = Instr::ConvertIntToReal;
+        convert.unaryop.output = rhs.reg;
+        convert.unaryop.src = rhs.reg;
+        bytecode << convert;
+    }
+
+    Instr arith;
+    if (expression->op == QSOperator::Add) {
+        arith.type = nativeReal?Instr::AddReal:Instr::AddInt;
+    } else if (expression->op == QSOperator::Sub) {
+        arith.type = nativeReal?Instr::MinusReal:Instr::MinusInt;
+    } else {
+        qFatal("Unsupported arithmetic operator");
+    }
+
+    // We release early so we can reuse one of the registers as 
+    // the output
+    releaseReg(lhs.reg);
+    releaseReg(rhs.reg);
+
+    type.reg = acquireReg();
+
+    arith.binaryop.output = type.reg;
+    arith.binaryop.src1 = lhs.reg;
+    arith.binaryop.src2 = rhs.reg;
+    bytecode << arith;
+
+    type.metaObject = 0;
+    type.type = nativeReal?QMetaType::QReal:QMetaType::Int;
+
+    return true;
+}
+
+bool QmlBindingCompiler::tryLogic(QmlJS::AST::Node *node)
+{
+    if (node->kind != AST::Node::Kind_BinaryExpression)
+        return false;
+
+    AST::BinaryExpression *expression = static_cast<AST::BinaryExpression *>(node);
+    if (expression->op == QSOperator::Gt)
+        return true;
+    else
+        return false;
+}
+
+bool QmlBindingCompiler::parseLogic(QmlJS::AST::Node *node, Result &type)
+{
+    AST::BinaryExpression *expression = static_cast<AST::BinaryExpression *>(node);
+
+    Result lhs;
+    Result rhs;
+
+    if (!parseExpression(expression->left, lhs)) return false;
+    if (!parseExpression(expression->right, rhs)) return false;
+
+    if (lhs.type != QMetaType::QReal || rhs.type != QMetaType::QReal)
+        return false;
+
+    // We release early so we can reuse one of the registers as 
+    // the output
+    releaseReg(lhs.reg);
+    releaseReg(rhs.reg);
+
+    type.reg = acquireReg();
+    type.metaObject = 0;
+    type.type = QVariant::Bool;
+
+    Instr op;
+    op.type = Instr::GreaterThanReal;
+    op.binaryop.output = type.reg;
+    op.binaryop.src1 = lhs.reg;
+    op.binaryop.src2 = rhs.reg;
+    bytecode << op;
+
+    return true;
+}
+
+bool QmlBindingCompiler::tryConditional(QmlJS::AST::Node *node)
+{
+    return (node->kind == AST::Node::Kind_ConditionalExpression);
+}
+
+bool QmlBindingCompiler::parseConditional(QmlJS::AST::Node *node, Result &type)
+{
+    AST::ConditionalExpression *expression = static_cast<AST::ConditionalExpression *>(node);
+
+    AST::Node *test = expression->expression;
+    if (test->kind == AST::Node::Kind_NestedExpression)
+        test = static_cast<AST::NestedExpression*>(test)->expression;
+
+    Result etype;
+    if (!parseExpression(test, etype)) return false;
+
+    if (etype.type != QVariant::Bool) 
+        return false;
+
+    Instr skip;
+    skip.type = Instr::Skip;
+    skip.skip.reg = etype.reg;
+    skip.skip.count = 0;
+    int skipIdx = bytecode.count();
+    bytecode << skip;
+
+    // Release to allow reuse of reg
+    releaseReg(etype.reg);
+
+    int preConditionalSubscriptions = subscriptionSet.count();
+
+    Result ok;
+    if (!parseExpression(expression->ok, ok)) return false;
+    if (ok.unknownType) return false;
+
+    int skipIdx2 = bytecode.count();
+    skip.skip.reg = -1;
+    bytecode << skip;
+
+    // Release to allow reuse of reg
+    releaseReg(ok.reg);
+    bytecode[skipIdx].skip.count = bytecode.count() - skipIdx - 1;
+
+    Result ko;
+    if (!parseExpression(expression->ko, ko)) return false;
+    if (ko.unknownType) return false;
+
+    // Release to allow reuse of reg
+    releaseReg(ko.reg);
+    bytecode[skipIdx2].skip.count = bytecode.count() - skipIdx2 - 1;
+
+    if (ok != ko)
+        return false; // Must be same type and in same register
+
+    if (preConditionalSubscriptions != subscriptionSet.count())
+        return false; // Conditionals cannot introduce new subscriptions
+
+    type = ok;
+
+    return true;
+}
+
+bool QmlBindingCompiler::tryConstant(QmlJS::AST::Node *node)
+{
+    return node->kind == AST::Node::Kind_TrueLiteral ||
+           node->kind == AST::Node::Kind_FalseLiteral ||
+           node->kind == AST::Node::Kind_NumericLiteral;
+}
+
+bool QmlBindingCompiler::parseConstant(QmlJS::AST::Node *node, Result &type)
+{
+    type.metaObject = 0;
+    type.type = -1;
+    type.reg = acquireReg();
+
+    if (node->kind == AST::Node::Kind_TrueLiteral) {
+        type.type = QVariant::Bool;
+        Instr instr;
+        instr.type = Instr::Bool;
+        instr.bool_value.reg = type.reg;
+        instr.bool_value.value = true;
+        bytecode << instr;
+        return true;
+    } else if (node->kind == AST::Node::Kind_FalseLiteral) {
+        type.type = QVariant::Bool;
+        Instr instr;
+        instr.type = Instr::Bool;
+        instr.bool_value.reg = type.reg;
+        instr.bool_value.value = false;
+        bytecode << instr;
+        return true;
+    } else if (node->kind == AST::Node::Kind_NumericLiteral) {
+        type.type = QMetaType::QReal;
+        Instr instr;
+        instr.type = Instr::Real;
+        instr.real_value.reg = type.reg;
+        instr.real_value.value = qreal(static_cast<AST::NumericLiteral *>(node)->value);
+        bytecode << instr;
+        return true;
+    } else {
+        return false;
+    }
+}
+
+bool QmlBindingCompiler::buildName(QStringList &name,
+                                       QmlJS::AST::Node *node)
+{
+    if (node->kind == AST::Node::Kind_IdentifierExpression) {
+        name << static_cast<AST::IdentifierExpression*>(node)->name->asString();
+    } else if (node->kind == AST::Node::Kind_FieldMemberExpression) {
+        AST::FieldMemberExpression *expr =
+            static_cast<AST::FieldMemberExpression *>(node);
+
+        if (!buildName(name, expr->base))
+            return false;
+
+        name << expr->name->asString();
+    } else {
+        return false;
+    }
+
+    return true;
+}
+
+QmlBindingCompiler::Result
+QmlBindingCompiler::fetch(const QMetaObject *mo, int reg, int idx, const QStringList &subName)
+{
+    QMetaProperty prop = mo->property(idx);
+    if (subscription(subName) && prop.hasNotifySignal() && prop.notifySignalIndex() != -1) {
+        Instr sub;
+        sub.type = Instr::Subscribe;
+        sub.subscribe.offset = subscriptionSet.count() - 1;
+        sub.subscribe.reg = reg;
+        sub.subscribe.index = prop.notifySignalIndex();
+        bytecode << sub;
+    }
+
+    Instr instr;
+    instr.type = Instr::Fetch;
+    instr.fetch.objectReg = reg;
+    instr.fetch.index = idx;
+    instr.fetch.output = reg;
+    bytecode << instr;
+
+    Result rv;
+    rv.type = prop.userType();
+    rv.metaObject = QmlMetaType::metaObjectForType(rv.type);
+    rv.reg = reg;
+
+    if (!rv.metaObject &&
+        rv.type != QMetaType::QReal &&
+        rv.type != QMetaType::Int &&
+        rv.type != QMetaType::Bool &&
+        rv.type != qMetaTypeId<QmlGraphicsAnchorLine>())
+        return Result(); // Unsupported type (string not supported yet);
+
+    return rv;
+}
+
+int QmlBindingCompiler::acquireReg()
+{
+    for (int ii = 0; ii < 32; ++ii) {
+        if (!(registers & (1 << ii))) {
+            registers |= (1 << ii);
+            return ii;
+        }
+    }
+    return -1;
+}
+
+void QmlBindingCompiler::releaseReg(int reg)
+{
+    Q_ASSERT(reg >= 0 && reg <= 31);
+
+    quint32 mask = 1 << reg;
+    registers &= ~mask;
+}
+
+int QmlBindingCompiler::registerString(const QString &string)
+{
+    Q_ASSERT(!string.isEmpty());
+
+    // ### Padding?
+    QByteArray strdata((const char *)string.constData(), string.length() * sizeof(QChar));
+    int rv = data.count();
+    data += strdata;
+
+    Instr reg;
+    reg.type = Instr::InitString;
+    reg.initstring.offset = strings++;
+    reg.initstring.dataIdx = rv;
+    reg.initstring.length = string.length();
+    bytecode << reg;
+
+    return strings - 1;
+}
+
+bool QmlBindingCompiler::subscription(const QStringList &sub)
+{
+    QString str = sub.join(QLatin1String("."));
+
+    if (subscriptionSet.contains(str)) {
+        return false;
+    } else {
+        subscriptionSet.insert(str);
+        return true;
+    }
+}
+
+QT_END_NAMESPACE
+
diff --git a/src/declarative/qml/qmlbindingvme_p.h b/src/declarative/qml/qmlbindingvme_p.h
new file mode 100644
index 0000000..9a0239d
--- /dev/null
+++ b/src/declarative/qml/qmlbindingvme_p.h
@@ -0,0 +1,95 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QMLBINDINGVME_P_H
+#define QMLBINDINGVME_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+#include <private/qmlbasicscript_p.h>
+#include <private/qscriptdeclarativeclass_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+class QObject;
+class QmlContextPrivate;
+class QmlBindingVME 
+{
+public:
+    struct Config {
+        Config() : target(0), targetSlot(-1), subscriptions(0), identifiers(0) {}
+        ~Config() { delete [] subscriptions; delete [] identifiers; }
+        QObject *target;
+        int targetSlot;
+
+        struct Subscription {
+            QGuard<QObject> source;
+            int notifyIndex;
+        };
+        Subscription *subscriptions;
+        QScriptDeclarativeClass::PersistentIdentifier *identifiers;
+    };
+
+    static QByteArray compile(const QmlBasicScript::Expression &);
+    static void run(const char *program, 
+                    Config *config, QmlContextPrivate *context, 
+                    QObject **scopes, QObject **outputs);
+    static void dump(const QByteArray &);
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QMLBINDINGVME_P_H
+
diff --git a/src/declarative/qml/qmlcompiler.cpp b/src/declarative/qml/qmlcompiler.cpp
index f9a9b1b..fa7da95 100644
--- a/src/declarative/qml/qmlcompiler.cpp
+++ b/src/declarative/qml/qmlcompiler.cpp
@@ -64,9 +64,12 @@
 #include "qmlscriptstring.h"
 #include "qmlglobal_p.h"
 #include "qmlscriptparser_p.h"
+#include "qmlbinding.h"
+#include "qmlbindingvme_p.h"
 
 #include <qfxperf_p_p.h>
 
+#include <QCoreApplication>
 #include <QColor>
 #include <QDebug>
 #include <QPointF>
@@ -74,12 +77,12 @@
 #include <QRectF>
 #include <QAtomicInt>
 #include <QtCore/qdebug.h>
-#include <QCoreApplication>
 
 QT_BEGIN_NAMESPACE
 
 DEFINE_BOOL_CONFIG_OPTION(compilerDump, QML_COMPILER_DUMP);
 DEFINE_BOOL_CONFIG_OPTION(compilerStatDump, QML_COMPILER_STATISTICS_DUMP);
+DEFINE_BOOL_CONFIG_OPTION(qmlExperimental, QML_EXPERIMENTAL);
 
 using namespace QmlParser;
 
@@ -2417,11 +2420,27 @@ void QmlCompiler::genBindingAssignment(QmlParser::Value *binding,
     Q_ASSERT(compileState.bindings.contains(binding));
 
     const BindingReference &ref = compileState.bindings.value(binding);
+    if (ref.dataType == BindingReference::Experimental) {
+        QmlInstruction store;
+        store.type = QmlInstruction::StoreCompiledBinding;
+        store.assignBinding.value = output->indexForByteArray(ref.compiledData);
+        store.assignBinding.context = ref.bindingContext.stack;
+        store.assignBinding.owner = ref.bindingContext.owner;
+        if (valueTypeProperty) 
+            store.assignBinding.property = (valueTypeProperty->index & 0xFFFF) |
+                                           ((valueTypeProperty->type & 0xFF)) << 16 |
+                                           ((prop->index & 0xFF) << 24);
+        else 
+            store.assignBinding.property = prop->index;
+        store.line = binding->location.start.line;
+        output->bytecode << store;
+        return;
+    }
 
     QmlInstruction store;
 
     QmlBasicScript bs;
-    if (ref.isBasicScript) 
+    if (ref.dataType == BindingReference::BasicScript) 
         bs.load(ref.compiledData.constData() + sizeof(quint32));
 
     if (bs.isSingleIdFetch()) {
@@ -2519,16 +2538,31 @@ bool QmlCompiler::completeComponentBuild()
         expr.expression = binding.expression;
 
         bs.compile(expr);
+
+        if (qmlExperimental() && (!bs.isValid() || (!bs.isSingleIdFetch() && !bs.isSingleContextProperty()))) {
+
+            QByteArray qmvdata = QmlBindingVME::compile(expr);
+            if (!qmvdata.isEmpty()) {
+                qWarning() << expr.expression.asScript();
+                QmlBindingVME::dump(qmvdata);
+                binding.dataType = BindingReference::Experimental;
+                binding.compiledData = qmvdata;
+                componentStat.optimizedBindings++;
+                continue;
+            }
+        }
+
         quint32 type;
         if (bs.isValid()) {
             binding.compiledData =
                 QByteArray(bs.compileData(), bs.compileDataSize());
             type = QmlExpressionPrivate::BasicScriptEngineData;
-            binding.isBasicScript = true;
+            binding.dataType = BindingReference::BasicScript;
 
             componentStat.optimizedBindings++;
         } else {
             type = QmlExpressionPrivate::PreTransformedQtScriptData;
+            binding.dataType = BindingReference::QtScript;
 
             // Pre-rewrite the expression
             QString expression = binding.expression.asScript();
@@ -2557,7 +2591,6 @@ bool QmlCompiler::completeComponentBuild()
                 QByteArray((const char *)&length, sizeof(quint32)) +
                 QByteArray((const char *)expression.constData(), 
                            expression.length() * sizeof(QChar));
-            binding.isBasicScript = false;
 
             componentStat.scriptBindings++;
         }
diff --git a/src/declarative/qml/qmlcompiler_p.h b/src/declarative/qml/qmlcompiler_p.h
index 809cc72..d734a12 100644
--- a/src/declarative/qml/qmlcompiler_p.h
+++ b/src/declarative/qml/qmlcompiler_p.h
@@ -269,7 +269,10 @@ private:
         QmlParser::Variant expression;
         QmlParser::Property *property;
         QmlParser::Value *value;
-        bool isBasicScript;
+
+        enum DataType { QtScript, BasicScript, Experimental };
+        DataType dataType;
+
         QByteArray compiledData;
         BindingContext bindingContext;
     };
diff --git a/src/declarative/qml/qmlcontext_p.h b/src/declarative/qml/qmlcontext_p.h
index 0229056..35971d9 100644
--- a/src/declarative/qml/qmlcontext_p.h
+++ b/src/declarative/qml/qmlcontext_p.h
@@ -130,7 +130,9 @@ public:
     static QmlContextPrivate *get(QmlContext *context) {
         return static_cast<QmlContextPrivate *>(QObjectPrivate::get(context));
     }
-
+    static QmlContext *get(QmlContextPrivate *context) {
+        return static_cast<QmlContext *>(context->q_func());
+    }
     // Only used for debugging
     QList<QPointer<QObject> > instances;
 };
diff --git a/src/declarative/qml/qmlinstruction.cpp b/src/declarative/qml/qmlinstruction.cpp
index 010010d..67db9c6 100644
--- a/src/declarative/qml/qmlinstruction.cpp
+++ b/src/declarative/qml/qmlinstruction.cpp
@@ -156,6 +156,9 @@ void QmlCompiledData::dump(QmlInstruction *instr, int idx)
         break;
 
     case QmlInstruction::StoreBinding:
+        qWarning().nospace() << idx << "\t\t" << line << "\t" << "STORE_BINDING\t" << instr->assignBinding.property << "\t" << instr->assignBinding.value << "\t" << instr->assignBinding.context;
+        break;
+    case QmlInstruction::StoreCompiledBinding:
         qWarning().nospace() << idx << "\t\t" << line << "\t" << "STORE_COMPILED_BINDING\t" << instr->assignBinding.property << "\t" << instr->assignBinding.value << "\t" << instr->assignBinding.context;
         break;
     case QmlInstruction::StoreIdOptBinding:
diff --git a/src/declarative/qml/qmlinstruction_p.h b/src/declarative/qml/qmlinstruction_p.h
index a5fc40c..d06ac86 100644
--- a/src/declarative/qml/qmlinstruction_p.h
+++ b/src/declarative/qml/qmlinstruction_p.h
@@ -128,6 +128,7 @@ public:
         AssignCustomType,         /* assignCustomType */
 
         StoreBinding,             /* assignBinding */
+        StoreCompiledBinding,     /* assignBinding */
         StoreIdOptBinding,        /* assignIdOptBinding */
         StoreObjPropBinding,      /* assignObjPropBinding */
         StoreValueSource,         /* assignValueSource */
@@ -196,7 +197,7 @@ public:
             int castValue;
         } assignValueInterceptor;
         struct {
-            int property;
+            unsigned int property;
             int value;
             short context;
             short owner;
diff --git a/src/declarative/qml/qmlvme.cpp b/src/declarative/qml/qmlvme.cpp
index e3fc288..e4295a1 100644
--- a/src/declarative/qml/qmlvme.cpp
+++ b/src/declarative/qml/qmlvme.cpp
@@ -608,6 +608,27 @@ QObject *QmlVME::run(QmlVMEStack<QObject *> &stack, QmlContext *ctxt,
             }
             break;
 
+        case QmlInstruction::StoreCompiledBinding:
+            {
+                QObject *target = 
+                    stack.at(stack.count() - 1 - instr.assignBinding.owner);
+                QObject *scope = 
+                    stack.at(stack.count() - 1 - instr.assignBinding.context);
+
+                int property = instr.assignBinding.property;
+                if (stack.count() == 1 && bindingSkipList.testBit(property & 0xFFFF))  
+                    break;
+
+                const char *data = datas.at(instr.assignBinding.value).constData();
+
+                QmlBinding_Basic *bind = 
+                    new QmlBinding_Basic(target, property, data, comp, scope, ctxt);
+                bindValues.append(bind);
+                bind->m_mePtr = &bindValues.values[bindValues.count - 1];
+                bind->addToObject(target);
+            }
+            break;
+
         case QmlInstruction::StoreIdOptBinding:
             {
                 int coreIndex = instr.assignIdOptBinding.property;
diff --git a/src/script/bridge/qscriptdeclarativeclass.cpp b/src/script/bridge/qscriptdeclarativeclass.cpp
index df00ce9..98b3e26 100644
--- a/src/script/bridge/qscriptdeclarativeclass.cpp
+++ b/src/script/bridge/qscriptdeclarativeclass.cpp
@@ -36,6 +36,7 @@
 QT_BEGIN_NAMESPACE
 
 QScriptDeclarativeClass::PersistentIdentifier::PersistentIdentifier()
+: identifier(0)
 {
     new (&d) JSC::Identifier();
 }