src/qml/qml/qqmlvmemetaobject.cpp

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  41
  42 #include "qqmlvmemetaobject_p.h"
  43
  44
  45 #include "qqml.h"
  46 #include <private/qqmlrefcount_p.h>
  47 #include "qqmlexpression.h"
  48 #include "qqmlexpression_p.h"
  49 #include "qqmlcontext_p.h"
  50 #include "qqmlbinding_p.h"
  51 #include "qqmlpropertyvalueinterceptor_p.h"
  52
  53 #include <private/qv8variantresource_p.h>
  54 #include <private/qqmlglobal_p.h>
  55
  56 Q_DECLARE_METATYPE(QJSValue);
  57
  58 QT_BEGIN_NAMESPACE
  59
  60 QQmlVMEVariantQObjectPtr::QQmlVMEVariantQObjectPtr()
  61     : QQmlGuard<QObject>(0), m_target(0), m_index(-1)
  62 {
  63 }
  64
  65 QQmlVMEVariantQObjectPtr::~QQmlVMEVariantQObjectPtr()
  66 {
  67 }
  68
  69 void QQmlVMEVariantQObjectPtr::objectDestroyed(QObject *)
  70 {
  71     if (m_target && m_index >= 0)
  72         m_target->activate(m_target->object, m_target->methodOffset + m_index, 0);
  73 }
  74
  75 void QQmlVMEVariantQObjectPtr::setGuardedValue(QObject *obj, QQmlVMEMetaObject *target, int index)
  76 {
  77     m_target = target;
  78     m_index = index;
  79     setObject(obj);
  80 }
  81
  82 class QQmlVMEVariant
  83 {
  84 public:
  85     inline QQmlVMEVariant();
  86     inline ~QQmlVMEVariant();
  87
  88     inline const void *dataPtr() const;
  89     inline void *dataPtr();
  90     inline int dataType() const;
  91     inline size_t dataSize() const;
  92
  93     inline QObject *asQObject();
  94     inline const QVariant &asQVariant();
  95     inline int asInt();
  96     inline bool asBool();
  97     inline double asDouble();
  98     inline const QString &asQString();
  99     inline const QUrl &asQUrl();
 100     inline const QTime &asQTime();
 101     inline const QDate &asQDate();
 102     inline const QDateTime &asQDateTime();
 103     inline const QJSValue &asQJSValue();
 104
 105     inline void setValue(QObject *v, QQmlVMEMetaObject *target, int index);
 106     inline void setValue(const QVariant &);
 107     inline void setValue(int);
 108     inline void setValue(bool);
 109     inline void setValue(double);
 110     inline void setValue(const QString &);
 111     inline void setValue(const QUrl &);
 112     inline void setValue(const QTime &);
 113     inline void setValue(const QDate &);
 114     inline void setValue(const QDateTime &);
 115     inline void setValue(const QJSValue &);
 116
 117     inline void setDataType(int t);
 118
 119 private:
 120     int type;
 121     void *data[6]; // Large enough to hold all types
 122
 123     inline void cleanup();
 124 };
 125
 126 class QQmlVMEMetaObjectEndpoint : public QQmlNotifierEndpoint
 127 {
 128 public:
 129     QQmlVMEMetaObjectEndpoint();
 130     static void vmecallback(QQmlNotifierEndpoint *, void **);
 131     void tryConnect();
 132
 133     QFlagPointer<QQmlVMEMetaObject> metaObject;
 134 };
 135
 136
 137 QQmlVMEVariant::QQmlVMEVariant()
 138 : type(QVariant::Invalid)
 139 {
 140 }
 141
 142 QQmlVMEVariant::~QQmlVMEVariant()
 143 {
 144     cleanup();
 145 }
 146
 147 void QQmlVMEVariant::cleanup()
 148 {
 149     if (type == QVariant::Invalid) {
 150     } else if (type == QMetaType::Int ||
 151                type == QMetaType::Bool ||
 152                type == QMetaType::Double) {
 153         type = QVariant::Invalid;
 154     } else if (type == QMetaType::QObjectStar) {
 155         ((QQmlVMEVariantQObjectPtr*)dataPtr())->~QQmlVMEVariantQObjectPtr();
 156         type = QVariant::Invalid;
 157     } else if (type == QMetaType::QString) {
 158         ((QString *)dataPtr())->~QString();
 159         type = QVariant::Invalid;
 160     } else if (type == QMetaType::QUrl) {
 161         ((QUrl *)dataPtr())->~QUrl();
 162         type = QVariant::Invalid;
 163     } else if (type == QMetaType::QTime) {
 164         ((QTime *)dataPtr())->~QTime();
 165         type = QVariant::Invalid;
 166     } else if (type == QMetaType::QDate) {
 167         ((QDate *)dataPtr())->~QDate();
 168         type = QVariant::Invalid;
 169     } else if (type == QMetaType::QDateTime) {
 170         ((QDateTime *)dataPtr())->~QDateTime();
 171         type = QVariant::Invalid;
 172     } else if (type == qMetaTypeId<QVariant>()) {
 173         ((QVariant *)dataPtr())->~QVariant();
 174         type = QVariant::Invalid;
 175     } else if (type == qMetaTypeId<QJSValue>()) {
 176         ((QJSValue *)dataPtr())->~QJSValue();
 177         type = QVariant::Invalid;
 178     } else {
 179         if (QQml_valueTypeProvider()->destroyValueType(type, dataPtr(), dataSize())) {
 180             type = QVariant::Invalid;
 181         }
 182     }
 183 }
 184
 185 int QQmlVMEVariant::dataType() const
 186 {
 187     return type;
 188 }
 189
 190 const void *QQmlVMEVariant::dataPtr() const
 191 {
 192     return &data;
 193 }
 194
 195 void *QQmlVMEVariant::dataPtr()
 196 {
 197     return &data;
 198 }
 199
 200 size_t QQmlVMEVariant::dataSize() const
 201 {
 202     return sizeof(data);
 203 }
 204
 205 QObject *QQmlVMEVariant::asQObject()
 206 {
 207     if (type != QMetaType::QObjectStar)
 208         setValue((QObject *)0, 0, -1);
 209
 210     return *(QQmlGuard<QObject> *)(dataPtr());
 211 }
 212
 213 const QVariant &QQmlVMEVariant::asQVariant()
 214 {
 215     if (type != QMetaType::QVariant)
 216         setValue(QVariant());
 217
 218     return *(QVariant *)(dataPtr());
 219 }
 220
 221 int QQmlVMEVariant::asInt()
 222 {
 223     if (type != QMetaType::Int)
 224         setValue(int(0));
 225
 226     return *(int *)(dataPtr());
 227 }
 228
 229 bool QQmlVMEVariant::asBool()
 230 {
 231     if (type != QMetaType::Bool)
 232         setValue(bool(false));
 233
 234     return *(bool *)(dataPtr());
 235 }
 236
 237 double QQmlVMEVariant::asDouble()
 238 {
 239     if (type != QMetaType::Double)
 240         setValue(double(0));
 241
 242     return *(double *)(dataPtr());
 243 }
 244
 245 const QString &QQmlVMEVariant::asQString()
 246 {
 247     if (type != QMetaType::QString)
 248         setValue(QString());
 249
 250     return *(QString *)(dataPtr());
 251 }
 252
 253 const QUrl &QQmlVMEVariant::asQUrl()
 254 {
 255     if (type != QMetaType::QUrl)
 256         setValue(QUrl());
 257
 258     return *(QUrl *)(dataPtr());
 259 }
 260
 261 const QTime &QQmlVMEVariant::asQTime()
 262 {
 263     if (type != QMetaType::QTime)
 264         setValue(QTime());
 265
 266     return *(QTime *)(dataPtr());
 267 }
 268
 269 const QDate &QQmlVMEVariant::asQDate()
 270 {
 271     if (type != QMetaType::QDate)
 272         setValue(QDate());
 273
 274     return *(QDate *)(dataPtr());
 275 }
 276
 277 const QDateTime &QQmlVMEVariant::asQDateTime()
 278 {
 279     if (type != QMetaType::QDateTime)
 280         setValue(QDateTime());
 281
 282     return *(QDateTime *)(dataPtr());
 283 }
 284
 285 const QJSValue &QQmlVMEVariant::asQJSValue()
 286 {
 287     if (type != qMetaTypeId<QJSValue>())
 288         setValue(QJSValue());
 289
 290     return *(QJSValue *)(dataPtr());
 291 }
 292
 293 void QQmlVMEVariant::setValue(QObject *v, QQmlVMEMetaObject *target, int index)
 294 {
 295     if (type != QMetaType::QObjectStar) {
 296         cleanup();
 297         type = QMetaType::QObjectStar;
 298         new (dataPtr()) QQmlVMEVariantQObjectPtr;
 299     }
 300     reinterpret_cast<QQmlVMEVariantQObjectPtr*>(dataPtr())->setGuardedValue(v, target, index);
 301 }
 302
 303 void QQmlVMEVariant::setValue(const QVariant &v)
 304 {
 305     if (type != qMetaTypeId<QVariant>()) {
 306         cleanup();
 307         type = qMetaTypeId<QVariant>();
 308         new (dataPtr()) QVariant(v);
 309     } else {
 310         *(QVariant *)(dataPtr()) = v;
 311     }
 312 }
 313
 314 void QQmlVMEVariant::setValue(int v)
 315 {
 316     if (type != QMetaType::Int) {
 317         cleanup();
 318         type = QMetaType::Int;
 319     }
 320     *(int *)(dataPtr()) = v;
 321 }
 322
 323 void QQmlVMEVariant::setValue(bool v)
 324 {
 325     if (type != QMetaType::Bool) {
 326         cleanup();
 327         type = QMetaType::Bool;
 328     }
 329     *(bool *)(dataPtr()) = v;
 330 }
 331
 332 void QQmlVMEVariant::setValue(double v)
 333 {
 334     if (type != QMetaType::Double) {
 335         cleanup();
 336         type = QMetaType::Double;
 337     }
 338     *(double *)(dataPtr()) = v;
 339 }
 340
 341 void QQmlVMEVariant::setValue(const QString &v)
 342 {
 343     if (type != QMetaType::QString) {
 344         cleanup();
 345         type = QMetaType::QString;
 346         new (dataPtr()) QString(v);
 347     } else {
 348         *(QString *)(dataPtr()) = v;
 349     }
 350 }
 351
 352 void QQmlVMEVariant::setValue(const QUrl &v)
 353 {
 354     if (type != QMetaType::QUrl) {
 355         cleanup();
 356         type = QMetaType::QUrl;
 357         new (dataPtr()) QUrl(v);
 358     } else {
 359         *(QUrl *)(dataPtr()) = v;
 360     }
 361 }
 362
 363 void QQmlVMEVariant::setValue(const QTime &v)
 364 {
 365     if (type != QMetaType::QTime) {
 366         cleanup();
 367         type = QMetaType::QTime;
 368         new (dataPtr()) QTime(v);
 369     } else {
 370         *(QTime *)(dataPtr()) = v;
 371     }
 372 }
 373
 374 void QQmlVMEVariant::setValue(const QDate &v)
 375 {
 376     if (type != QMetaType::QDate) {
 377         cleanup();
 378         type = QMetaType::QDate;
 379         new (dataPtr()) QDate(v);
 380     } else {
 381         *(QDate *)(dataPtr()) = v;
 382     }
 383 }
 384
 385 void QQmlVMEVariant::setValue(const QDateTime &v)
 386 {
 387     if (type != QMetaType::QDateTime) {
 388         cleanup();
 389         type = QMetaType::QDateTime;
 390         new (dataPtr()) QDateTime(v);
 391     } else {
 392         *(QDateTime *)(dataPtr()) = v;
 393     }
 394 }
 395
 396 void QQmlVMEVariant::setValue(const QJSValue &v)
 397 {
 398     if (type != qMetaTypeId<QJSValue>()) {
 399         cleanup();
 400         type = qMetaTypeId<QJSValue>();
 401         new (dataPtr()) QJSValue(v);
 402     } else {
 403         *(QJSValue *)(dataPtr()) = v;
 404     }
 405 }
 406
 407 void QQmlVMEVariant::setDataType(int t)
 408 {
 409     type = t;
 410 }
 411
 412 QQmlVMEMetaObjectEndpoint::QQmlVMEMetaObjectEndpoint()
 413 {
 414     callback = &vmecallback;
 415 }
 416
 417 void QQmlVMEMetaObjectEndpoint::vmecallback(QQmlNotifierEndpoint *e, void **)
 418 {
 419     QQmlVMEMetaObjectEndpoint *vmee = static_cast<QQmlVMEMetaObjectEndpoint*>(e);
 420     vmee->tryConnect();
 421 }
 422
 423 void QQmlVMEMetaObjectEndpoint::tryConnect()
 424 {
 425     int aliasId = this - metaObject->aliasEndpoints;
 426
 427     if (metaObject.flag()) {
 428         // This is actually notify
 429         int sigIdx = metaObject->methodOffset + aliasId + metaObject->metaData->propertyCount;
 430         QMetaObject::activate(metaObject->object, sigIdx, 0);
 431     } else {
 432         QQmlVMEMetaData::AliasData *d = metaObject->metaData->aliasData() + aliasId;
 433         if (!d->isObjectAlias()) {
 434             QQmlContextData *ctxt = metaObject->ctxt;
 435             QObject *target = ctxt->idValues[d->contextIdx].data();
 436             if (!target)
 437                 return;
 438
 439             QMetaProperty prop = target->metaObject()->property(d->propertyIndex());
 440             if (prop.hasNotifySignal())
 441                 connect(target, prop.notifySignalIndex());
 442         }
 443
 444         metaObject.setFlag();
 445     }
 446 }
 447
 448 QQmlVMEMetaObject::QQmlVMEMetaObject(QObject *obj,
 449                                                      const QMetaObject *other,
 450                                                      const QQmlVMEMetaData *meta,
 451                                                      QQmlCompiledData *cdata)
 452 : QV8GCCallback::Node(GcPrologueCallback), object(obj), compiledData(cdata),
 453   ctxt(QQmlData::get(obj, true)->outerContext), metaData(meta), data(0),
 454   aliasEndpoints(0), firstVarPropertyIndex(-1), varPropertiesInitialized(false),
 455   v8methods(0), parent(0)
 456 {
 457     compiledData->addref();
 458
 459     *static_cast<QMetaObject *>(this) = *other;
 460     this->d.superdata = obj->metaObject();
 461
 462     QObjectPrivate *op = QObjectPrivate::get(obj);
 463     if (op->metaObject)
 464         parent = static_cast<QAbstractDynamicMetaObject*>(op->metaObject);
 465     op->metaObject = this;
 466
 467     propOffset = QAbstractDynamicMetaObject::propertyOffset();
 468     methodOffset = QAbstractDynamicMetaObject::methodOffset();
 469
 470     data = new QQmlVMEVariant[metaData->propertyCount - metaData->varPropertyCount];
 471
 472     aConnected.resize(metaData->aliasCount);
 473     int list_type = qMetaTypeId<QQmlListProperty<QObject> >();
 474
 475     // ### Optimize
 476     for (int ii = 0; ii < metaData->propertyCount - metaData->varPropertyCount; ++ii) {
 477         int t = (metaData->propertyData() + ii)->propertyType;
 478         if (t == list_type) {
 479             listProperties.append(List(methodOffset + ii));
 480             data[ii].setValue(listProperties.count() - 1);
 481         }
 482     }
 483
 484     firstVarPropertyIndex = metaData->propertyCount - metaData->varPropertyCount;
 485     if (metaData->varPropertyCount)
 486         QV8GCCallback::addGcCallbackNode(this);
 487 }
 488
 489 QQmlVMEMetaObject::~QQmlVMEMetaObject()
 490 {
 491     compiledData->release();
 492     delete parent;
 493     delete [] data;
 494     delete [] aliasEndpoints;
 495
 496     for (int ii = 0; v8methods && ii < metaData->methodCount; ++ii) {
 497         qPersistentDispose(v8methods[ii]);
 498     }
 499     delete [] v8methods;
 500
 501     if (metaData->varPropertyCount)
 502         qPersistentDispose(varProperties); // if not weak, will not have been cleaned up by the callback.
 503 }
 504
 505 int QQmlVMEMetaObject::metaCall(QMetaObject::Call c, int _id, void **a)
 506 {
 507     int id = _id;
 508     if(c == QMetaObject::WriteProperty) {
 509         int flags = *reinterpret_cast<int*>(a[3]);
 510         if (!(flags & QQmlPropertyPrivate::BypassInterceptor)
 511             && !aInterceptors.isEmpty()
 512             && aInterceptors.testBit(id)) {
 513             QPair<int, QQmlPropertyValueInterceptor*> pair = interceptors.value(id);
 514             int valueIndex = pair.first;
 515             QQmlPropertyValueInterceptor *vi = pair.second;
 516             int type = property(id).userType();
 517
 518             if (type != QVariant::Invalid) {
 519                 if (valueIndex != -1) {
 520                     QQmlEnginePrivate *ep = ctxt?QQmlEnginePrivate::get(ctxt->engine):0;
 521                     QQmlValueType *valueType = 0;
 522                     if (ep) valueType = ep->valueTypes[type];
 523                     else valueType = QQmlValueTypeFactory::valueType(type);
 524                     Q_ASSERT(valueType);
 525
 526                     valueType->setValue(QVariant(type, a[0]));
 527                     QMetaProperty valueProp = valueType->metaObject()->property(valueIndex);
 528                     vi->write(valueProp.read(valueType));
 529
 530                     if (!ep) delete valueType;
 531                     return -1;
 532                 } else {
 533                     vi->write(QVariant(type, a[0]));
 534                     return -1;
 535                 }
 536             }
 537         }
 538     }
 539     if (c == QMetaObject::ReadProperty || c == QMetaObject::WriteProperty || c == QMetaObject::ResetProperty) {
 540         if (id >= propOffset) {
 541             id -= propOffset;
 542
 543             if (id < metaData->propertyCount) {
 544                int t = (metaData->propertyData() + id)->propertyType;
 545                 bool needActivate = false;
 546
 547                 if (id >= firstVarPropertyIndex) {
 548                     Q_ASSERT(t == QMetaType::QVariant);
 549                     // the context can be null if accessing var properties from cpp after re-parenting an item.
 550                     QQmlEnginePrivate *ep = (ctxt == 0 || ctxt->engine == 0) ? 0 : QQmlEnginePrivate::get(ctxt->engine);
 551                     QV8Engine *v8e = (ep == 0) ? 0 : ep->v8engine();
 552                     if (v8e) {
 553                         v8::HandleScope handleScope;
 554                         v8::Context::Scope contextScope(v8e->context());
 555                         if (c == QMetaObject::ReadProperty) {
 556                             *reinterpret_cast<QVariant *>(a[0]) = readPropertyAsVariant(id);
 557                         } else if (c == QMetaObject::WriteProperty) {
 558                             writeProperty(id, *reinterpret_cast<QVariant *>(a[0]));
 559                         }
 560                     } else if (c == QMetaObject::ReadProperty) {
 561                         // if the context was disposed, we just return an invalid variant from read.
 562                         *reinterpret_cast<QVariant *>(a[0]) = QVariant();
 563                     }
 564
 565                 } else {
 566
 567                     if (c == QMetaObject::ReadProperty) {
 568                         switch(t) {
 569                         case QVariant::Int:
 570                             *reinterpret_cast<int *>(a[0]) = data[id].asInt();
 571                             break;
 572                         case QVariant::Bool:
 573                             *reinterpret_cast<bool *>(a[0]) = data[id].asBool();
 574                             break;
 575                         case QVariant::Double:
 576                             *reinterpret_cast<double *>(a[0]) = data[id].asDouble();
 577                             break;
 578                         case QVariant::String:
 579                             *reinterpret_cast<QString *>(a[0]) = data[id].asQString();
 580                             break;
 581                         case QVariant::Url:
 582                             *reinterpret_cast<QUrl *>(a[0]) = data[id].asQUrl();
 583                             break;
 584                         case QVariant::Date:
 585                             *reinterpret_cast<QDate *>(a[0]) = data[id].asQDate();
 586                             break;
 587                         case QVariant::DateTime:
 588                             *reinterpret_cast<QDateTime *>(a[0]) = data[id].asQDateTime();
 589                             break;
 590                         case QMetaType::QObjectStar:
 591                             *reinterpret_cast<QObject **>(a[0]) = data[id].asQObject();
 592                             break;
 593                         case QMetaType::QVariant:
 594                             *reinterpret_cast<QVariant *>(a[0]) = readPropertyAsVariant(id);
 595                             break;
 596                         default:
 597                             QQml_valueTypeProvider()->readValueType(data[id].dataType(), data[id].dataPtr(), t, a[0]);
 598                             break;
 599                         }
 600                         if (t == qMetaTypeId<QQmlListProperty<QObject> >()) {
 601                             int listIndex = data[id].asInt();
 602                             const List *list = &listProperties.at(listIndex);
 603                             *reinterpret_cast<QQmlListProperty<QObject> *>(a[0]) =
 604                                 QQmlListProperty<QObject>(object, (void *)list,
 605                                                                   list_append, list_count, list_at,
 606                                                                   list_clear);
 607                         }
 608
 609                     } else if (c == QMetaObject::WriteProperty) {
 610
 611                         switch(t) {
 612                         case QVariant::Int:
 613                             needActivate = *reinterpret_cast<int *>(a[0]) != data[id].asInt();
 614                             data[id].setValue(*reinterpret_cast<int *>(a[0]));
 615                             break;
 616                         case QVariant::Bool:
 617                             needActivate = *reinterpret_cast<bool *>(a[0]) != data[id].asBool();
 618                             data[id].setValue(*reinterpret_cast<bool *>(a[0]));
 619                             break;
 620                         case QVariant::Double:
 621                             needActivate = *reinterpret_cast<double *>(a[0]) != data[id].asDouble();
 622                             data[id].setValue(*reinterpret_cast<double *>(a[0]));
 623                             break;
 624                         case QVariant::String:
 625                             needActivate = *reinterpret_cast<QString *>(a[0]) != data[id].asQString();
 626                             data[id].setValue(*reinterpret_cast<QString *>(a[0]));
 627                             break;
 628                         case QVariant::Url:
 629                             needActivate = *reinterpret_cast<QUrl *>(a[0]) != data[id].asQUrl();
 630                             data[id].setValue(*reinterpret_cast<QUrl *>(a[0]));
 631                             break;
 632                         case QVariant::Date:
 633                             needActivate = *reinterpret_cast<QDate *>(a[0]) != data[id].asQDate();
 634                             data[id].setValue(*reinterpret_cast<QDate *>(a[0]));
 635                             break;
 636                         case QVariant::DateTime:
 637                             needActivate = *reinterpret_cast<QDateTime *>(a[0]) != data[id].asQDateTime();
 638                             data[id].setValue(*reinterpret_cast<QDateTime *>(a[0]));
 639                             break;
 640                         case QMetaType::QObjectStar:
 641                             needActivate = *reinterpret_cast<QObject **>(a[0]) != data[id].asQObject();
 642                             data[id].setValue(*reinterpret_cast<QObject **>(a[0]), this, id);
 643                             break;
 644                         case QMetaType::QVariant:
 645                             writeProperty(id, *reinterpret_cast<QVariant *>(a[0]));
 646                             break;
 647                         default:
 648                             needActivate = QQml_valueTypeProvider()->writeValueType(t, a[0], data[id].dataPtr(), data[id].dataSize());
 649                             if (needActivate) {
 650                                 data[id].setDataType(t);
 651                             }
 652                             break;
 653                         }
 654                     }
 655
 656                 }
 657
 658                 if (c == QMetaObject::WriteProperty && needActivate) {
 659                     activate(object, methodOffset + id, 0);
 660                 }
 661
 662                 return -1;
 663             }
 664
 665             id -= metaData->propertyCount;
 666
 667             if (id < metaData->aliasCount) {
 668
 669                 QQmlVMEMetaData::AliasData *d = metaData->aliasData() + id;
 670
 671                 if (d->flags & QML_ALIAS_FLAG_PTR && c == QMetaObject::ReadProperty)
 672                         *reinterpret_cast<void **>(a[0]) = 0;
 673
 674                 if (!ctxt) return -1;
 675
 676                 QQmlContext *context = ctxt->asQQmlContext();
 677                 QQmlContextPrivate *ctxtPriv = QQmlContextPrivate::get(context);
 678
 679                 QObject *target = ctxtPriv->data->idValues[d->contextIdx].data();
 680                 if (!target)
 681                     return -1;
 682
 683                 connectAlias(id);
 684
 685                 if (d->isObjectAlias()) {
 686                     *reinterpret_cast<QObject **>(a[0]) = target;
 687                     return -1;
 688                 }
 689
 690                 // Remove binding (if any) on write
 691                 if(c == QMetaObject::WriteProperty) {
 692                     int flags = *reinterpret_cast<int*>(a[3]);
 693                     if (flags & QQmlPropertyPrivate::RemoveBindingOnAliasWrite) {
 694                         QQmlData *targetData = QQmlData::get(target);
 695                         if (targetData && targetData->hasBindingBit(d->propertyIndex())) {
 696                             QQmlAbstractBinding *binding = QQmlPropertyPrivate::setBinding(target, d->propertyIndex(), d->isValueTypeAlias()?d->valueTypeIndex():-1, 0);
 697                             if (binding) binding->destroy();
 698                         }
 699                     }
 700                 }
 701
 702                 if (d->isValueTypeAlias()) {
 703                     // Value type property
 704                     QQmlEnginePrivate *ep = QQmlEnginePrivate::get(ctxt->engine);
 705
 706                     QQmlValueType *valueType = ep->valueTypes[d->valueType()];
 707                     Q_ASSERT(valueType);
 708
 709                     valueType->read(target, d->propertyIndex());
 710                     int rv = QMetaObject::metacall(valueType, c, d->valueTypeIndex(), a);
 711
 712                     if (c == QMetaObject::WriteProperty)
 713                         valueType->write(target, d->propertyIndex(), 0x00);
 714
 715                     return rv;
 716
 717                 } else {
 718                     return QMetaObject::metacall(target, c, d->propertyIndex(), a);
 719                 }
 720
 721             }
 722             return -1;
 723
 724         }
 725
 726     } else if(c == QMetaObject::InvokeMetaMethod) {
 727
 728         if (id >= methodOffset) {
 729
 730             id -= methodOffset;
 731             int plainSignals = metaData->signalCount + metaData->propertyCount +
 732                                metaData->aliasCount;
 733             if (id < plainSignals) {
 734                 QMetaObject::activate(object, _id, a);
 735                 return -1;
 736             }
 737
 738             id -= plainSignals;
 739
 740             if (id < metaData->methodCount) {
 741                 if (!ctxt->engine)
 742                     return -1; // We can't run the method
 743
 744                 QQmlEnginePrivate *ep = QQmlEnginePrivate::get(ctxt->engine);
 745                 ep->referenceScarceResources(); // "hold" scarce resources in memory during evaluation.
 746
 747                 v8::Handle<v8::Function> function = method(id);
 748                 if (function.IsEmpty()) {
 749                     // The function was not compiled.  There are some exceptional cases which the
 750                     // expression rewriter does not rewrite properly (e.g., \r-terminated lines
 751                     // are not rewritten correctly but this bug is deemed out-of-scope to fix for
 752                     // performance reasons; see QTBUG-24064) and thus compilation will have failed.
 753                     QQmlError e;
 754                     e.setDescription(QString(QLatin1String("Exception occurred during compilation of function: %1")).
 755                                      arg(QLatin1String(QMetaObject::method(_id).methodSignature().constData())));
 756                     ep->warning(e);
 757                     return -1; // The dynamic method with that id is not available.
 758                 }
 759
 760                 QQmlVMEMetaData::MethodData *data = metaData->methodData() + id;
 761
 762                 v8::HandleScope handle_scope;
 763                 v8::Context::Scope scope(ep->v8engine()->context());
 764                 v8::Handle<v8::Value> *args = 0;
 765
 766                 if (data->parameterCount) {
 767                     args = new v8::Handle<v8::Value>[data->parameterCount];
 768                     for (int ii = 0; ii < data->parameterCount; ++ii)
 769                         args[ii] = ep->v8engine()->fromVariant(*(QVariant *)a[ii + 1]);
 770                 }
 771
 772                 v8::TryCatch try_catch;
 773
 774                 v8::Local<v8::Value> result = function->Call(ep->v8engine()->global(), data->parameterCount, args);
 775
 776                 QVariant rv;
 777                 if (try_catch.HasCaught()) {
 778                     QQmlError error;
 779                     QQmlExpressionPrivate::exceptionToError(try_catch.Message(), error);
 780                     if (error.isValid())
 781                         ep->warning(error);
 782                     if (a[0]) *(QVariant *)a[0] = QVariant();
 783                 } else {
 784                     if (a[0]) *(QVariant *)a[0] = ep->v8engine()->toVariant(result, 0);
 785                 }
 786
 787                 ep->dereferenceScarceResources(); // "release" scarce resources if top-level expression evaluation is complete.
 788                 return -1;
 789             }
 790             return -1;
 791         }
 792     }
 793
 794     if (parent)
 795         return parent->metaCall(c, _id, a);
 796     else
 797         return object->qt_metacall(c, _id, a);
 798 }
 799
 800 v8::Handle<v8::Function> QQmlVMEMetaObject::method(int index)
 801 {
 802     if (!v8methods)
 803         v8methods = new v8::Persistent<v8::Function>[metaData->methodCount];
 804
 805     if (v8methods[index].IsEmpty()) {
 806         QQmlVMEMetaData::MethodData *data = metaData->methodData() + index;
 807
 808         const char *body = ((const char*)metaData) + data->bodyOffset;
 809         int bodyLength = data->bodyLength;
 810
 811         // XXX We should evaluate all methods in a single big script block to
 812         // improve the call time between dynamic methods defined on the same
 813         // object
 814         v8methods[index] = QQmlExpressionPrivate::evalFunction(ctxt, object, body,
 815                                                                        bodyLength,
 816                                                                        ctxt->urlString,
 817                                                                        data->lineNumber);
 818     }
 819
 820     return v8methods[index];
 821 }
 822
 823 v8::Handle<v8::Value> QQmlVMEMetaObject::readVarProperty(int id)
 824 {
 825     Q_ASSERT(id >= firstVarPropertyIndex);
 826
 827     if (ensureVarPropertiesAllocated())
 828         return varProperties->Get(id - firstVarPropertyIndex);
 829     return v8::Handle<v8::Value>();
 830 }
 831
 832 QVariant QQmlVMEMetaObject::readPropertyAsVariant(int id)
 833 {
 834     if (id >= firstVarPropertyIndex) {
 835         if (ensureVarPropertiesAllocated())
 836             return QQmlEnginePrivate::get(ctxt->engine)->v8engine()->toVariant(varProperties->Get(id - firstVarPropertyIndex), -1);
 837         return QVariant();
 838     } else {
 839         if (data[id].dataType() == QMetaType::QObjectStar) {
 840             return QVariant::fromValue(data[id].asQObject());
 841         } else {
 842             return data[id].asQVariant();
 843         }
 844     }
 845 }
 846
 847 void QQmlVMEMetaObject::writeVarProperty(int id, v8::Handle<v8::Value> value)
 848 {
 849     Q_ASSERT(id >= firstVarPropertyIndex);
 850     if (!ensureVarPropertiesAllocated())
 851         return;
 852
 853     // Importantly, if the current value is a scarce resource, we need to ensure that it
 854     // gets automatically released by the engine if no other references to it exist.
 855     v8::Local<v8::Value> oldv = varProperties->Get(id - firstVarPropertyIndex);
 856     if (oldv->IsObject()) {
 857         QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(oldv));
 858         if (r) {
 859             r->removeVmePropertyReference();
 860         }
 861     }
 862
 863     // And, if the new value is a scarce resource, we need to ensure that it does not get
 864     // automatically released by the engine until no other references to it exist.
 865     if (value->IsObject()) {
 866         QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(value));
 867         if (r) {
 868             r->addVmePropertyReference();
 869         }
 870     }
 871
 872     // Write the value and emit change signal as appropriate.
 873     varProperties->Set(id - firstVarPropertyIndex, value);
 874     activate(object, methodOffset + id, 0);
 875 }
 876
 877 void QQmlVMEMetaObject::writeProperty(int id, const QVariant &value)
 878 {
 879     if (id >= firstVarPropertyIndex) {
 880         if (!ensureVarPropertiesAllocated())
 881             return;
 882
 883         // Importantly, if the current value is a scarce resource, we need to ensure that it
 884         // gets automatically released by the engine if no other references to it exist.
 885         v8::Local<v8::Value> oldv = varProperties->Get(id - firstVarPropertyIndex);
 886         if (oldv->IsObject()) {
 887             QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(oldv));
 888             if (r) {
 889                 r->removeVmePropertyReference();
 890             }
 891         }
 892
 893         // And, if the new value is a scarce resource, we need to ensure that it does not get
 894         // automatically released by the engine until no other references to it exist.
 895         v8::Handle<v8::Value> newv = QQmlEnginePrivate::get(ctxt->engine)->v8engine()->fromVariant(value);
 896         if (newv->IsObject()) {
 897             QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(newv));
 898             if (r) {
 899                 r->addVmePropertyReference();
 900             }
 901         }
 902
 903         // Write the value and emit change signal as appropriate.
 904         QVariant currentValue = readPropertyAsVariant(id);
 905         varProperties->Set(id - firstVarPropertyIndex, newv);
 906         if ((currentValue.userType() != value.userType() || currentValue != value))
 907             activate(object, methodOffset + id, 0);
 908     } else {
 909         bool needActivate = false;
 910         if (value.userType() == QMetaType::QObjectStar) {
 911             QObject *o = qvariant_cast<QObject *>(value);
 912             needActivate = (data[id].dataType() != QMetaType::QObjectStar || data[id].asQObject() != o);
 913             data[id].setValue(qvariant_cast<QObject *>(value), this, id);
 914         } else {
 915             needActivate = (data[id].dataType() != qMetaTypeId<QVariant>() ||
 916                             data[id].asQVariant().userType() != value.userType() ||
 917                             data[id].asQVariant() != value);
 918             data[id].setValue(value);
 919         }
 920
 921         if (needActivate)
 922             activate(object, methodOffset + id, 0);
 923     }
 924 }
 925
 926 void QQmlVMEMetaObject::listChanged(int id)
 927 {
 928     activate(object, methodOffset + id, 0);
 929 }
 930
 931 void QQmlVMEMetaObject::list_append(QQmlListProperty<QObject> *prop, QObject *o)
 932 {
 933     List *list = static_cast<List *>(prop->data);
 934     list->append(o);
 935     QMetaObject::activate(prop->object, list->notifyIndex, 0);
 936 }
 937
 938 int QQmlVMEMetaObject::list_count(QQmlListProperty<QObject> *prop)
 939 {
 940     return static_cast<List *>(prop->data)->count();
 941 }
 942
 943 QObject *QQmlVMEMetaObject::list_at(QQmlListProperty<QObject> *prop, int index)
 944 {
 945     return static_cast<List *>(prop->data)->at(index);
 946 }
 947
 948 void QQmlVMEMetaObject::list_clear(QQmlListProperty<QObject> *prop)
 949 {
 950     List *list = static_cast<List *>(prop->data);
 951     list->clear();
 952     QMetaObject::activate(prop->object, list->notifyIndex, 0);
 953 }
 954
 955 void QQmlVMEMetaObject::registerInterceptor(int index, int valueIndex, QQmlPropertyValueInterceptor *interceptor)
 956 {
 957     if (aInterceptors.isEmpty())
 958         aInterceptors.resize(propertyCount() + metaData->propertyCount);
 959     aInterceptors.setBit(index);
 960     interceptors.insert(index, qMakePair(valueIndex, interceptor));
 961 }
 962
 963 int QQmlVMEMetaObject::vmeMethodLineNumber(int index)
 964 {
 965     if (index < methodOffset) {
 966         Q_ASSERT(parent);
 967         return static_cast<QQmlVMEMetaObject *>(parent)->vmeMethodLineNumber(index);
 968     }
 969
 970     int plainSignals = metaData->signalCount + metaData->propertyCount + metaData->aliasCount;
 971     Q_ASSERT(index >= (methodOffset + plainSignals) && index < (methodOffset + plainSignals + metaData->methodCount));
 972
 973     int rawIndex = index - methodOffset - plainSignals;
 974
 975     QQmlVMEMetaData::MethodData *data = metaData->methodData() + rawIndex;
 976     return data->lineNumber;
 977 }
 978
 979 v8::Handle<v8::Function> QQmlVMEMetaObject::vmeMethod(int index)
 980 {
 981     if (index < methodOffset) {
 982         Q_ASSERT(parent);
 983         return static_cast<QQmlVMEMetaObject *>(parent)->vmeMethod(index);
 984     }
 985     int plainSignals = metaData->signalCount + metaData->propertyCount + metaData->aliasCount;
 986     Q_ASSERT(index >= (methodOffset + plainSignals) && index < (methodOffset + plainSignals + metaData->methodCount));
 987     return method(index - methodOffset - plainSignals);
 988 }
 989
 990 // Used by debugger
 991 void QQmlVMEMetaObject::setVmeMethod(int index, v8::Persistent<v8::Function> value)
 992 {
 993     if (index < methodOffset) {
 994         Q_ASSERT(parent);
 995         return static_cast<QQmlVMEMetaObject *>(parent)->setVmeMethod(index, value);
 996     }
 997     int plainSignals = metaData->signalCount + metaData->propertyCount + metaData->aliasCount;
 998     Q_ASSERT(index >= (methodOffset + plainSignals) && index < (methodOffset + plainSignals + metaData->methodCount));
 999
1000     if (!v8methods)
1001         v8methods = new v8::Persistent<v8::Function>[metaData->methodCount];
1002
1003     int methodIndex = index - methodOffset - plainSignals;
1004     if (!v8methods[methodIndex].IsEmpty())
1005         qPersistentDispose(v8methods[methodIndex]);
1006     v8methods[methodIndex] = value;
1007 }
1008
1009 v8::Handle<v8::Value> QQmlVMEMetaObject::vmeProperty(int index)
1010 {
1011     if (index < propOffset) {
1012         Q_ASSERT(parent);
1013         return static_cast<QQmlVMEMetaObject *>(parent)->vmeProperty(index);
1014     }
1015     return readVarProperty(index - propOffset);
1016 }
1017
1018 void QQmlVMEMetaObject::setVMEProperty(int index, v8::Handle<v8::Value> v)
1019 {
1020     if (index < propOffset) {
1021         Q_ASSERT(parent);
1022         static_cast<QQmlVMEMetaObject *>(parent)->setVMEProperty(index, v);
1023         return;
1024     }
1025     return writeVarProperty(index - propOffset, v);
1026 }
1027
1028 bool QQmlVMEMetaObject::ensureVarPropertiesAllocated()
1029 {
1030     if (!varPropertiesInitialized)
1031         allocateVarPropertiesArray();
1032
1033     // in some situations, the QObject's v8object (and associated v8 data,
1034     // such as the varProperties array) will have been cleaned up, but the
1035     // QObject ptr will not yet have been deleted (eg, waiting on deleteLater).
1036     // In this situation, the varProperties handle will be (and should remain)
1037     // empty.
1038     return !varProperties.IsEmpty();
1039 }
1040
1041 // see also: QV8GCCallback::garbageCollectorPrologueCallback()
1042 void QQmlVMEMetaObject::allocateVarPropertiesArray()
1043 {
1044     v8::HandleScope handleScope;
1045     v8::Context::Scope cs(QQmlEnginePrivate::get(ctxt->engine)->v8engine()->context());
1046     varProperties = qPersistentNew(v8::Array::New(metaData->varPropertyCount));
1047     varProperties.MakeWeak(static_cast<void*>(this), VarPropertiesWeakReferenceCallback);
1048     varPropertiesInitialized = true;
1049 }
1050
1051 /*
1052    The "var" properties are stored in a v8::Array which will be strong persistent if the object has cpp-ownership
1053    and the root QObject in the parent chain does not have JS-ownership.  In the weak persistent handle case,
1054    this callback will dispose the handle when the v8object which owns the lifetime of the var properties array
1055    is cleared as a result of all other handles to that v8object being released.
1056    See QV8GCCallback::garbageCollectorPrologueCallback() for more information.
1057  */
1058 void QQmlVMEMetaObject::VarPropertiesWeakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
1059 {
1060     QQmlVMEMetaObject *vmemo = static_cast<QQmlVMEMetaObject*>(parameter);
1061     Q_ASSERT(vmemo);
1062     qPersistentDispose(object);
1063     vmemo->varProperties.Clear();
1064 }
1065
1066 void QQmlVMEMetaObject::GcPrologueCallback(QV8GCCallback::Node *node)
1067 {
1068     QQmlVMEMetaObject *vmemo = static_cast<QQmlVMEMetaObject*>(node);
1069     Q_ASSERT(vmemo);
1070     if (!vmemo->varPropertiesInitialized || vmemo->varProperties.IsEmpty() || !vmemo->ctxt || !vmemo->ctxt->engine)
1071         return;
1072     QQmlEnginePrivate *ep = QQmlEnginePrivate::get(vmemo->ctxt->engine);
1073     ep->v8engine()->addRelationshipForGC(vmemo->object, vmemo->varProperties);
1074 }
1075
1076 bool QQmlVMEMetaObject::aliasTarget(int index, QObject **target, int *coreIndex, int *valueTypeIndex) const
1077 {
1078     Q_ASSERT(index >= propOffset + metaData->propertyCount);
1079
1080     *target = 0;
1081     *coreIndex = -1;
1082     *valueTypeIndex = -1;
1083
1084     if (!ctxt)
1085         return false;
1086
1087     QQmlVMEMetaData::AliasData *d = metaData->aliasData() + (index - propOffset - metaData->propertyCount);
1088     QQmlContext *context = ctxt->asQQmlContext();
1089     QQmlContextPrivate *ctxtPriv = QQmlContextPrivate::get(context);
1090
1091     *target = ctxtPriv->data->idValues[d->contextIdx].data();
1092     if (!*target)
1093         return false;
1094
1095     if (d->isObjectAlias()) {
1096     } else if (d->isValueTypeAlias()) {
1097         *coreIndex = d->propertyIndex();
1098         *valueTypeIndex = d->valueTypeIndex();
1099     } else {
1100         *coreIndex = d->propertyIndex();
1101     }
1102
1103     return true;
1104 }
1105
1106 void QQmlVMEMetaObject::connectAlias(int aliasId)
1107 {
1108     if (!aConnected.testBit(aliasId)) {
1109
1110         if (!aliasEndpoints)
1111             aliasEndpoints = new QQmlVMEMetaObjectEndpoint[metaData->aliasCount];
1112
1113         aConnected.setBit(aliasId);
1114
1115         QQmlVMEMetaData::AliasData *d = metaData->aliasData() + aliasId;
1116
1117         QQmlVMEMetaObjectEndpoint *endpoint = aliasEndpoints + aliasId;
1118         endpoint->metaObject = this;
1119
1120         endpoint->connect(&ctxt->idValues[d->contextIdx].bindings);
1121
1122         endpoint->tryConnect();
1123     }
1124 }
1125
1126 void QQmlVMEMetaObject::connectAliasSignal(int index)
1127 {
1128     int aliasId = (index - methodOffset) - metaData->propertyCount;
1129     if (aliasId < 0 || aliasId >= metaData->aliasCount)
1130         return;
1131
1132     connectAlias(aliasId);
1133 }
1134
1135 QT_END_NAMESPACE