src/qml/qml/qqmlvmemetaobject.cpp

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  22 ** Alternatively, this file may be used under the terms of the GNU General
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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
  55 Q_DECLARE_METATYPE(QJSValue);
  56
  57 QT_BEGIN_NAMESPACE
  58
  59 class QQmlVMEVariant
  60 {
  61 public:
  62     inline QQmlVMEVariant();
  63     inline ~QQmlVMEVariant();
  64
  65     inline const void *dataPtr() const;
  66     inline void *dataPtr();
  67     inline int dataType() const;
  68
  69     inline QObject *asQObject();
  70     inline const QVariant &asQVariant();
  71     inline int asInt();
  72     inline bool asBool();
  73     inline double asDouble();
  74     inline const QString &asQString();
  75     inline const QUrl &asQUrl();
  76     inline const QColor &asQColor();
  77     inline const QTime &asQTime();
  78     inline const QDate &asQDate();
  79     inline const QDateTime &asQDateTime();
  80     inline const QJSValue &asQJSValue();
  81
  82     inline void setValue(QObject *);
  83     inline void setValue(const QVariant &);
  84     inline void setValue(int);
  85     inline void setValue(bool);
  86     inline void setValue(double);
  87     inline void setValue(const QString &);
  88     inline void setValue(const QUrl &);
  89     inline void setValue(const QColor &);
  90     inline void setValue(const QTime &);
  91     inline void setValue(const QDate &);
  92     inline void setValue(const QDateTime &);
  93     inline void setValue(const QJSValue &);
  94 private:
  95     int type;
  96     void *data[4]; // Large enough to hold all types
  97
  98     inline void cleanup();
  99 };
 100
 101 class QQmlVMEMetaObjectEndpoint : public QQmlNotifierEndpoint
 102 {
 103 public:
 104     QQmlVMEMetaObjectEndpoint();
 105     static void vmecallback(QQmlNotifierEndpoint *);
 106     void tryConnect();
 107
 108     QFlagPointer<QQmlVMEMetaObject> metaObject;
 109 };
 110
 111
 112 QQmlVMEVariant::QQmlVMEVariant()
 113 : type(QVariant::Invalid)
 114 {
 115 }
 116
 117 QQmlVMEVariant::~QQmlVMEVariant()
 118 {
 119     cleanup();
 120 }
 121
 122 void QQmlVMEVariant::cleanup()
 123 {
 124     if (type == QVariant::Invalid) {
 125     } else if (type == QMetaType::Int ||
 126                type == QMetaType::Bool ||
 127                type == QMetaType::Double) {
 128         type = QVariant::Invalid;
 129     } else if (type == QMetaType::QObjectStar) {
 130         ((QQmlGuard<QObject>*)dataPtr())->~QQmlGuard<QObject>();
 131         type = QVariant::Invalid;
 132     } else if (type == QMetaType::QString) {
 133         ((QString *)dataPtr())->~QString();
 134         type = QVariant::Invalid;
 135     } else if (type == QMetaType::QUrl) {
 136         ((QUrl *)dataPtr())->~QUrl();
 137         type = QVariant::Invalid;
 138     } else if (type == QMetaType::QColor) {
 139         ((QColor *)dataPtr())->~QColor();
 140         type = QVariant::Invalid;
 141     } else if (type == QMetaType::QTime) {
 142         ((QTime *)dataPtr())->~QTime();
 143         type = QVariant::Invalid;
 144     } else if (type == QMetaType::QDate) {
 145         ((QDate *)dataPtr())->~QDate();
 146         type = QVariant::Invalid;
 147     } else if (type == QMetaType::QDateTime) {
 148         ((QDateTime *)dataPtr())->~QDateTime();
 149         type = QVariant::Invalid;
 150     } else if (type == qMetaTypeId<QVariant>()) {
 151         ((QVariant *)dataPtr())->~QVariant();
 152         type = QVariant::Invalid;
 153     } else if (type == qMetaTypeId<QJSValue>()) {
 154         ((QJSValue *)dataPtr())->~QJSValue();
 155         type = QVariant::Invalid;
 156     }
 157
 158 }
 159
 160 int QQmlVMEVariant::dataType() const
 161 {
 162     return type;
 163 }
 164
 165 const void *QQmlVMEVariant::dataPtr() const
 166 {
 167     return &data;
 168 }
 169
 170 void *QQmlVMEVariant::dataPtr()
 171 {
 172     return &data;
 173 }
 174
 175 QObject *QQmlVMEVariant::asQObject()
 176 {
 177     if (type != QMetaType::QObjectStar)
 178         setValue((QObject *)0);
 179
 180     return *(QQmlGuard<QObject> *)(dataPtr());
 181 }
 182
 183 const QVariant &QQmlVMEVariant::asQVariant()
 184 {
 185     if (type != QMetaType::QVariant)
 186         setValue(QVariant());
 187
 188     return *(QVariant *)(dataPtr());
 189 }
 190
 191 int QQmlVMEVariant::asInt()
 192 {
 193     if (type != QMetaType::Int)
 194         setValue(int(0));
 195
 196     return *(int *)(dataPtr());
 197 }
 198
 199 bool QQmlVMEVariant::asBool()
 200 {
 201     if (type != QMetaType::Bool)
 202         setValue(bool(false));
 203
 204     return *(bool *)(dataPtr());
 205 }
 206
 207 double QQmlVMEVariant::asDouble()
 208 {
 209     if (type != QMetaType::Double)
 210         setValue(double(0));
 211
 212     return *(double *)(dataPtr());
 213 }
 214
 215 const QString &QQmlVMEVariant::asQString()
 216 {
 217     if (type != QMetaType::QString)
 218         setValue(QString());
 219
 220     return *(QString *)(dataPtr());
 221 }
 222
 223 const QUrl &QQmlVMEVariant::asQUrl()
 224 {
 225     if (type != QMetaType::QUrl)
 226         setValue(QUrl());
 227
 228     return *(QUrl *)(dataPtr());
 229 }
 230
 231 const QColor &QQmlVMEVariant::asQColor()
 232 {
 233     if (type != QMetaType::QColor)
 234         setValue(QColor());
 235
 236     return *(QColor *)(dataPtr());
 237 }
 238
 239 const QTime &QQmlVMEVariant::asQTime()
 240 {
 241     if (type != QMetaType::QTime)
 242         setValue(QTime());
 243
 244     return *(QTime *)(dataPtr());
 245 }
 246
 247 const QDate &QQmlVMEVariant::asQDate()
 248 {
 249     if (type != QMetaType::QDate)
 250         setValue(QDate());
 251
 252     return *(QDate *)(dataPtr());
 253 }
 254
 255 const QDateTime &QQmlVMEVariant::asQDateTime()
 256 {
 257     if (type != QMetaType::QDateTime)
 258         setValue(QDateTime());
 259
 260     return *(QDateTime *)(dataPtr());
 261 }
 262
 263 const QJSValue &QQmlVMEVariant::asQJSValue()
 264 {
 265     if (type != qMetaTypeId<QJSValue>())
 266         setValue(QJSValue());
 267
 268     return *(QJSValue *)(dataPtr());
 269 }
 270
 271 void QQmlVMEVariant::setValue(QObject *v)
 272 {
 273     if (type != QMetaType::QObjectStar) {
 274         cleanup();
 275         type = QMetaType::QObjectStar;
 276         new (dataPtr()) QQmlGuard<QObject>();
 277     }
 278     *(QQmlGuard<QObject>*)(dataPtr()) = v;
 279 }
 280
 281 void QQmlVMEVariant::setValue(const QVariant &v)
 282 {
 283     if (type != qMetaTypeId<QVariant>()) {
 284         cleanup();
 285         type = qMetaTypeId<QVariant>();
 286         new (dataPtr()) QVariant(v);
 287     } else {
 288         *(QVariant *)(dataPtr()) = v;
 289     }
 290 }
 291
 292 void QQmlVMEVariant::setValue(int v)
 293 {
 294     if (type != QMetaType::Int) {
 295         cleanup();
 296         type = QMetaType::Int;
 297     }
 298     *(int *)(dataPtr()) = v;
 299 }
 300
 301 void QQmlVMEVariant::setValue(bool v)
 302 {
 303     if (type != QMetaType::Bool) {
 304         cleanup();
 305         type = QMetaType::Bool;
 306     }
 307     *(bool *)(dataPtr()) = v;
 308 }
 309
 310 void QQmlVMEVariant::setValue(double v)
 311 {
 312     if (type != QMetaType::Double) {
 313         cleanup();
 314         type = QMetaType::Double;
 315     }
 316     *(double *)(dataPtr()) = v;
 317 }
 318
 319 void QQmlVMEVariant::setValue(const QString &v)
 320 {
 321     if (type != QMetaType::QString) {
 322         cleanup();
 323         type = QMetaType::QString;
 324         new (dataPtr()) QString(v);
 325     } else {
 326         *(QString *)(dataPtr()) = v;
 327     }
 328 }
 329
 330 void QQmlVMEVariant::setValue(const QUrl &v)
 331 {
 332     if (type != QMetaType::QUrl) {
 333         cleanup();
 334         type = QMetaType::QUrl;
 335         new (dataPtr()) QUrl(v);
 336     } else {
 337         *(QUrl *)(dataPtr()) = v;
 338     }
 339 }
 340
 341 void QQmlVMEVariant::setValue(const QColor &v)
 342 {
 343     if (type != QMetaType::QColor) {
 344         cleanup();
 345         type = QMetaType::QColor;
 346         new (dataPtr()) QColor(v);
 347     } else {
 348         *(QColor *)(dataPtr()) = v;
 349     }
 350 }
 351
 352 void QQmlVMEVariant::setValue(const QTime &v)
 353 {
 354     if (type != QMetaType::QTime) {
 355         cleanup();
 356         type = QMetaType::QTime;
 357         new (dataPtr()) QTime(v);
 358     } else {
 359         *(QTime *)(dataPtr()) = v;
 360     }
 361 }
 362
 363 void QQmlVMEVariant::setValue(const QDate &v)
 364 {
 365     if (type != QMetaType::QDate) {
 366         cleanup();
 367         type = QMetaType::QDate;
 368         new (dataPtr()) QDate(v);
 369     } else {
 370         *(QDate *)(dataPtr()) = v;
 371     }
 372 }
 373
 374 void QQmlVMEVariant::setValue(const QDateTime &v)
 375 {
 376     if (type != QMetaType::QDateTime) {
 377         cleanup();
 378         type = QMetaType::QDateTime;
 379         new (dataPtr()) QDateTime(v);
 380     } else {
 381         *(QDateTime *)(dataPtr()) = v;
 382     }
 383 }
 384
 385 void QQmlVMEVariant::setValue(const QJSValue &v)
 386 {
 387     if (type != qMetaTypeId<QJSValue>()) {
 388         cleanup();
 389         type = qMetaTypeId<QJSValue>();
 390         new (dataPtr()) QJSValue(v);
 391     } else {
 392         *(QJSValue *)(dataPtr()) = v;
 393     }
 394 }
 395
 396 QQmlVMEMetaObjectEndpoint::QQmlVMEMetaObjectEndpoint()
 397 {
 398     callback = &vmecallback;
 399 }
 400
 401 void QQmlVMEMetaObjectEndpoint::vmecallback(QQmlNotifierEndpoint *e)
 402 {
 403     QQmlVMEMetaObjectEndpoint *vmee = static_cast<QQmlVMEMetaObjectEndpoint*>(e);
 404     vmee->tryConnect();
 405 }
 406
 407 void QQmlVMEMetaObjectEndpoint::tryConnect()
 408 {
 409     int aliasId = this - metaObject->aliasEndpoints;
 410
 411     if (metaObject.flag()) {
 412         // This is actually notify
 413         int sigIdx = metaObject->methodOffset + aliasId + metaObject->metaData->propertyCount;
 414         QMetaObject::activate(metaObject->object, sigIdx, 0);
 415     } else {
 416         QQmlVMEMetaData::AliasData *d = metaObject->metaData->aliasData() + aliasId;
 417         if (!d->isObjectAlias()) {
 418             QQmlContextData *ctxt = metaObject->ctxt;
 419             QObject *target = ctxt->idValues[d->contextIdx].data();
 420             if (!target)
 421                 return;
 422
 423             QMetaProperty prop = target->metaObject()->property(d->propertyIndex());
 424             if (prop.hasNotifySignal())
 425                 connect(target, prop.notifySignalIndex());
 426         }
 427
 428         metaObject.setFlag();
 429     }
 430 }
 431
 432 QQmlVMEMetaObject::QQmlVMEMetaObject(QObject *obj,
 433                                                      const QMetaObject *other,
 434                                                      const QQmlVMEMetaData *meta,
 435                                                      QQmlCompiledData *cdata)
 436 : QV8GCCallback::Node(GcPrologueCallback), object(obj), compiledData(cdata),
 437   ctxt(QQmlData::get(obj, true)->outerContext), metaData(meta), data(0),
 438   aliasEndpoints(0), firstVarPropertyIndex(-1), varPropertiesInitialized(false),
 439   v8methods(0), parent(0)
 440 {
 441     compiledData->addref();
 442
 443     *static_cast<QMetaObject *>(this) = *other;
 444     this->d.superdata = obj->metaObject();
 445
 446     QObjectPrivate *op = QObjectPrivate::get(obj);
 447     if (op->metaObject)
 448         parent = static_cast<QAbstractDynamicMetaObject*>(op->metaObject);
 449     op->metaObject = this;
 450
 451     propOffset = QAbstractDynamicMetaObject::propertyOffset();
 452     methodOffset = QAbstractDynamicMetaObject::methodOffset();
 453
 454     data = new QQmlVMEVariant[metaData->propertyCount - metaData->varPropertyCount];
 455
 456     aConnected.resize(metaData->aliasCount);
 457     int list_type = qMetaTypeId<QQmlListProperty<QObject> >();
 458
 459     // ### Optimize
 460     for (int ii = 0; ii < metaData->propertyCount - metaData->varPropertyCount; ++ii) {
 461         int t = (metaData->propertyData() + ii)->propertyType;
 462         if (t == list_type) {
 463             listProperties.append(List(methodOffset + ii));
 464             data[ii].setValue(listProperties.count() - 1);
 465         }
 466     }
 467
 468     firstVarPropertyIndex = metaData->propertyCount - metaData->varPropertyCount;
 469     if (metaData->varPropertyCount)
 470         QV8GCCallback::addGcCallbackNode(this);
 471 }
 472
 473 QQmlVMEMetaObject::~QQmlVMEMetaObject()
 474 {
 475     compiledData->release();
 476     delete parent;
 477     delete [] data;
 478     delete [] aliasEndpoints;
 479
 480     for (int ii = 0; v8methods && ii < metaData->methodCount; ++ii) {
 481         qPersistentDispose(v8methods[ii]);
 482     }
 483     delete [] v8methods;
 484
 485     if (metaData->varPropertyCount)
 486         qPersistentDispose(varProperties); // if not weak, will not have been cleaned up by the callback.
 487 }
 488
 489 int QQmlVMEMetaObject::metaCall(QMetaObject::Call c, int _id, void **a)
 490 {
 491     int id = _id;
 492     if(c == QMetaObject::WriteProperty) {
 493         int flags = *reinterpret_cast<int*>(a[3]);
 494         if (!(flags & QQmlPropertyPrivate::BypassInterceptor)
 495             && !aInterceptors.isEmpty()
 496             && aInterceptors.testBit(id)) {
 497             QPair<int, QQmlPropertyValueInterceptor*> pair = interceptors.value(id);
 498             int valueIndex = pair.first;
 499             QQmlPropertyValueInterceptor *vi = pair.second;
 500             int type = property(id).userType();
 501
 502             if (type != QVariant::Invalid) {
 503                 if (valueIndex != -1) {
 504                     QQmlEnginePrivate *ep = ctxt?QQmlEnginePrivate::get(ctxt->engine):0;
 505                     QQmlValueType *valueType = 0;
 506                     if (ep) valueType = ep->valueTypes[type];
 507                     else valueType = QQmlValueTypeFactory::valueType(type);
 508                     Q_ASSERT(valueType);
 509
 510                     valueType->setValue(QVariant(type, a[0]));
 511                     QMetaProperty valueProp = valueType->metaObject()->property(valueIndex);
 512                     vi->write(valueProp.read(valueType));
 513
 514                     if (!ep) delete valueType;
 515                     return -1;
 516                 } else {
 517                     vi->write(QVariant(type, a[0]));
 518                     return -1;
 519                 }
 520             }
 521         }
 522     }
 523     if (c == QMetaObject::ReadProperty || c == QMetaObject::WriteProperty || c == QMetaObject::ResetProperty) {
 524         if (id >= propOffset) {
 525             id -= propOffset;
 526
 527             if (id < metaData->propertyCount) {
 528                int t = (metaData->propertyData() + id)->propertyType;
 529                 bool needActivate = false;
 530
 531                 if (id >= firstVarPropertyIndex) {
 532                     Q_ASSERT(t == QMetaType::QVariant);
 533                     // the context can be null if accessing var properties from cpp after re-parenting an item.
 534                     QQmlEnginePrivate *ep = (ctxt == 0 || ctxt->engine == 0) ? 0 : QQmlEnginePrivate::get(ctxt->engine);
 535                     QV8Engine *v8e = (ep == 0) ? 0 : ep->v8engine();
 536                     if (v8e) {
 537                         v8::HandleScope handleScope;
 538                         v8::Context::Scope contextScope(v8e->context());
 539                         if (c == QMetaObject::ReadProperty) {
 540                             *reinterpret_cast<QVariant *>(a[0]) = readPropertyAsVariant(id);
 541                         } else if (c == QMetaObject::WriteProperty) {
 542                             writeProperty(id, *reinterpret_cast<QVariant *>(a[0]));
 543                         }
 544                     } else if (c == QMetaObject::ReadProperty) {
 545                         // if the context was disposed, we just return an invalid variant from read.
 546                         *reinterpret_cast<QVariant *>(a[0]) = QVariant();
 547                     }
 548
 549                 } else {
 550
 551                     if (c == QMetaObject::ReadProperty) {
 552                         switch(t) {
 553                         case QVariant::Int:
 554                             *reinterpret_cast<int *>(a[0]) = data[id].asInt();
 555                             break;
 556                         case QVariant::Bool:
 557                             *reinterpret_cast<bool *>(a[0]) = data[id].asBool();
 558                             break;
 559                         case QVariant::Double:
 560                             *reinterpret_cast<double *>(a[0]) = data[id].asDouble();
 561                             break;
 562                         case QVariant::String:
 563                             *reinterpret_cast<QString *>(a[0]) = data[id].asQString();
 564                             break;
 565                         case QVariant::Url:
 566                             *reinterpret_cast<QUrl *>(a[0]) = data[id].asQUrl();
 567                             break;
 568                         case QVariant::Color:
 569                             *reinterpret_cast<QColor *>(a[0]) = data[id].asQColor();
 570                             break;
 571                         case QVariant::Date:
 572                             *reinterpret_cast<QDate *>(a[0]) = data[id].asQDate();
 573                             break;
 574                         case QVariant::DateTime:
 575                             *reinterpret_cast<QDateTime *>(a[0]) = data[id].asQDateTime();
 576                             break;
 577                         case QMetaType::QObjectStar:
 578                             *reinterpret_cast<QObject **>(a[0]) = data[id].asQObject();
 579                             break;
 580                         case QMetaType::QVariant:
 581                             *reinterpret_cast<QVariant *>(a[0]) = readPropertyAsVariant(id);
 582                             break;
 583                         default:
 584                             break;
 585                         }
 586                         if (t == qMetaTypeId<QQmlListProperty<QObject> >()) {
 587                             int listIndex = data[id].asInt();
 588                             const List *list = &listProperties.at(listIndex);
 589                             *reinterpret_cast<QQmlListProperty<QObject> *>(a[0]) =
 590                                 QQmlListProperty<QObject>(object, (void *)list,
 591                                                                   list_append, list_count, list_at,
 592                                                                   list_clear);
 593                         }
 594
 595                     } else if (c == QMetaObject::WriteProperty) {
 596
 597                         switch(t) {
 598                         case QVariant::Int:
 599                             needActivate = *reinterpret_cast<int *>(a[0]) != data[id].asInt();
 600                             data[id].setValue(*reinterpret_cast<int *>(a[0]));
 601                             break;
 602                         case QVariant::Bool:
 603                             needActivate = *reinterpret_cast<bool *>(a[0]) != data[id].asBool();
 604                             data[id].setValue(*reinterpret_cast<bool *>(a[0]));
 605                             break;
 606                         case QVariant::Double:
 607                             needActivate = *reinterpret_cast<double *>(a[0]) != data[id].asDouble();
 608                             data[id].setValue(*reinterpret_cast<double *>(a[0]));
 609                             break;
 610                         case QVariant::String:
 611                             needActivate = *reinterpret_cast<QString *>(a[0]) != data[id].asQString();
 612                             data[id].setValue(*reinterpret_cast<QString *>(a[0]));
 613                             break;
 614                         case QVariant::Url:
 615                             needActivate = *reinterpret_cast<QUrl *>(a[0]) != data[id].asQUrl();
 616                             data[id].setValue(*reinterpret_cast<QUrl *>(a[0]));
 617                             break;
 618                         case QVariant::Color:
 619                             needActivate = *reinterpret_cast<QColor *>(a[0]) != data[id].asQColor();
 620                             data[id].setValue(*reinterpret_cast<QColor *>(a[0]));
 621                             break;
 622                         case QVariant::Date:
 623                             needActivate = *reinterpret_cast<QDate *>(a[0]) != data[id].asQDate();
 624                             data[id].setValue(*reinterpret_cast<QDate *>(a[0]));
 625                             break;
 626                         case QVariant::DateTime:
 627                             needActivate = *reinterpret_cast<QDateTime *>(a[0]) != data[id].asQDateTime();
 628                             data[id].setValue(*reinterpret_cast<QDateTime *>(a[0]));
 629                             break;
 630                         case QMetaType::QObjectStar:
 631                             needActivate = *reinterpret_cast<QObject **>(a[0]) != data[id].asQObject();
 632                             data[id].setValue(*reinterpret_cast<QObject **>(a[0]));
 633                             break;
 634                         case QMetaType::QVariant:
 635                             writeProperty(id, *reinterpret_cast<QVariant *>(a[0]));
 636                             break;
 637                         default:
 638                             break;
 639                         }
 640                     }
 641
 642                 }
 643
 644                 if (c == QMetaObject::WriteProperty && needActivate) {
 645                     activate(object, methodOffset + id, 0);
 646                 }
 647
 648                 return -1;
 649             }
 650
 651             id -= metaData->propertyCount;
 652
 653             if (id < metaData->aliasCount) {
 654
 655                 QQmlVMEMetaData::AliasData *d = metaData->aliasData() + id;
 656
 657                 if (d->flags & QML_ALIAS_FLAG_PTR && c == QMetaObject::ReadProperty)
 658                         *reinterpret_cast<void **>(a[0]) = 0;
 659
 660                 if (!ctxt) return -1;
 661
 662                 QQmlContext *context = ctxt->asQQmlContext();
 663                 QQmlContextPrivate *ctxtPriv = QQmlContextPrivate::get(context);
 664
 665                 QObject *target = ctxtPriv->data->idValues[d->contextIdx].data();
 666                 if (!target)
 667                     return -1;
 668
 669                 connectAlias(id);
 670
 671                 if (d->isObjectAlias()) {
 672                     *reinterpret_cast<QObject **>(a[0]) = target;
 673                     return -1;
 674                 }
 675
 676                 // Remove binding (if any) on write
 677                 if(c == QMetaObject::WriteProperty) {
 678                     int flags = *reinterpret_cast<int*>(a[3]);
 679                     if (flags & QQmlPropertyPrivate::RemoveBindingOnAliasWrite) {
 680                         QQmlData *targetData = QQmlData::get(target);
 681                         if (targetData && targetData->hasBindingBit(d->propertyIndex())) {
 682                             QQmlAbstractBinding *binding = QQmlPropertyPrivate::setBinding(target, d->propertyIndex(), d->isValueTypeAlias()?d->valueTypeIndex():-1, 0);
 683                             if (binding) binding->destroy();
 684                         }
 685                     }
 686                 }
 687
 688                 if (d->isValueTypeAlias()) {
 689                     // Value type property
 690                     QQmlEnginePrivate *ep = QQmlEnginePrivate::get(ctxt->engine);
 691
 692                     QQmlValueType *valueType = ep->valueTypes[d->valueType()];
 693                     Q_ASSERT(valueType);
 694
 695                     valueType->read(target, d->propertyIndex());
 696                     int rv = QMetaObject::metacall(valueType, c, d->valueTypeIndex(), a);
 697
 698                     if (c == QMetaObject::WriteProperty)
 699                         valueType->write(target, d->propertyIndex(), 0x00);
 700
 701                     return rv;
 702
 703                 } else {
 704                     return QMetaObject::metacall(target, c, d->propertyIndex(), a);
 705                 }
 706
 707             }
 708             return -1;
 709
 710         }
 711
 712     } else if(c == QMetaObject::InvokeMetaMethod) {
 713
 714         if (id >= methodOffset) {
 715
 716             id -= methodOffset;
 717             int plainSignals = metaData->signalCount + metaData->propertyCount +
 718                                metaData->aliasCount;
 719             if (id < plainSignals) {
 720                 QMetaObject::activate(object, _id, a);
 721                 return -1;
 722             }
 723
 724             id -= plainSignals;
 725
 726             if (id < metaData->methodCount) {
 727                 if (!ctxt->engine)
 728                     return -1; // We can't run the method
 729
 730                 QQmlEnginePrivate *ep = QQmlEnginePrivate::get(ctxt->engine);
 731                 ep->referenceScarceResources(); // "hold" scarce resources in memory during evaluation.
 732
 733                 v8::Handle<v8::Function> function = method(id);
 734                 if (function.IsEmpty()) {
 735                     // The function was not compiled.  There are some exceptional cases which the
 736                     // expression rewriter does not rewrite properly (e.g., \r-terminated lines
 737                     // are not rewritten correctly but this bug is deemed out-of-scope to fix for
 738                     // performance reasons; see QTBUG-24064) and thus compilation will have failed.
 739                     QQmlError e;
 740                     e.setDescription(QString(QLatin1String("Exception occurred during compilation of function: %1")).
 741                                      arg(QLatin1String(QMetaObject::method(_id).methodSignature().constData())));
 742                     ep->warning(e);
 743                     return -1; // The dynamic method with that id is not available.
 744                 }
 745
 746                 QQmlVMEMetaData::MethodData *data = metaData->methodData() + id;
 747
 748                 v8::HandleScope handle_scope;
 749                 v8::Context::Scope scope(ep->v8engine()->context());
 750                 v8::Handle<v8::Value> *args = 0;
 751
 752                 if (data->parameterCount) {
 753                     args = new v8::Handle<v8::Value>[data->parameterCount];
 754                     for (int ii = 0; ii < data->parameterCount; ++ii)
 755                         args[ii] = ep->v8engine()->fromVariant(*(QVariant *)a[ii + 1]);
 756                 }
 757
 758                 v8::TryCatch try_catch;
 759
 760                 v8::Local<v8::Value> result = function->Call(ep->v8engine()->global(), data->parameterCount, args);
 761
 762                 QVariant rv;
 763                 if (try_catch.HasCaught()) {
 764                     QQmlError error;
 765                     QQmlExpressionPrivate::exceptionToError(try_catch.Message(), error);
 766                     if (error.isValid())
 767                         ep->warning(error);
 768                     if (a[0]) *(QVariant *)a[0] = QVariant();
 769                 } else {
 770                     if (a[0]) *(QVariant *)a[0] = ep->v8engine()->toVariant(result, 0);
 771                 }
 772
 773                 ep->dereferenceScarceResources(); // "release" scarce resources if top-level expression evaluation is complete.
 774                 return -1;
 775             }
 776             return -1;
 777         }
 778     }
 779
 780     if (parent)
 781         return parent->metaCall(c, _id, a);
 782     else
 783         return object->qt_metacall(c, _id, a);
 784 }
 785
 786 v8::Handle<v8::Function> QQmlVMEMetaObject::method(int index)
 787 {
 788     if (!v8methods)
 789         v8methods = new v8::Persistent<v8::Function>[metaData->methodCount];
 790
 791     if (v8methods[index].IsEmpty()) {
 792         QQmlVMEMetaData::MethodData *data = metaData->methodData() + index;
 793
 794         const char *body = ((const char*)metaData) + data->bodyOffset;
 795         int bodyLength = data->bodyLength;
 796
 797         // XXX We should evaluate all methods in a single big script block to
 798         // improve the call time between dynamic methods defined on the same
 799         // object
 800         v8methods[index] = QQmlExpressionPrivate::evalFunction(ctxt, object, body,
 801                                                                        bodyLength,
 802                                                                        ctxt->urlString,
 803                                                                        data->lineNumber);
 804     }
 805
 806     return v8methods[index];
 807 }
 808
 809 v8::Handle<v8::Value> QQmlVMEMetaObject::readVarProperty(int id)
 810 {
 811     Q_ASSERT(id >= firstVarPropertyIndex);
 812
 813     ensureVarPropertiesAllocated();
 814     return varProperties->Get(id - firstVarPropertyIndex);
 815 }
 816
 817 QVariant QQmlVMEMetaObject::readPropertyAsVariant(int id)
 818 {
 819     if (id >= firstVarPropertyIndex) {
 820         ensureVarPropertiesAllocated();
 821         return QQmlEnginePrivate::get(ctxt->engine)->v8engine()->toVariant(varProperties->Get(id - firstVarPropertyIndex), -1);
 822     } else {
 823         if (data[id].dataType() == QMetaType::QObjectStar) {
 824             return QVariant::fromValue(data[id].asQObject());
 825         } else {
 826             return data[id].asQVariant();
 827         }
 828     }
 829 }
 830
 831 void QQmlVMEMetaObject::writeVarProperty(int id, v8::Handle<v8::Value> value)
 832 {
 833     Q_ASSERT(id >= firstVarPropertyIndex);
 834     ensureVarPropertiesAllocated();
 835
 836     // Importantly, if the current value is a scarce resource, we need to ensure that it
 837     // gets automatically released by the engine if no other references to it exist.
 838     v8::Local<v8::Value> oldv = varProperties->Get(id - firstVarPropertyIndex);
 839     if (oldv->IsObject()) {
 840         QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(oldv));
 841         if (r) {
 842             r->removeVmePropertyReference();
 843         }
 844     }
 845
 846     // And, if the new value is a scarce resource, we need to ensure that it does not get
 847     // automatically released by the engine until no other references to it exist.
 848     if (value->IsObject()) {
 849         QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(value));
 850         if (r) {
 851             r->addVmePropertyReference();
 852         }
 853     }
 854
 855     // Write the value and emit change signal as appropriate.
 856     varProperties->Set(id - firstVarPropertyIndex, value);
 857     activate(object, methodOffset + id, 0);
 858 }
 859
 860 void QQmlVMEMetaObject::writeProperty(int id, const QVariant &value)
 861 {
 862     if (id >= firstVarPropertyIndex) {
 863         ensureVarPropertiesAllocated();
 864
 865         // Importantly, if the current value is a scarce resource, we need to ensure that it
 866         // gets automatically released by the engine if no other references to it exist.
 867         v8::Local<v8::Value> oldv = varProperties->Get(id - firstVarPropertyIndex);
 868         if (oldv->IsObject()) {
 869             QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(oldv));
 870             if (r) {
 871                 r->removeVmePropertyReference();
 872             }
 873         }
 874
 875         // And, if the new value is a scarce resource, we need to ensure that it does not get
 876         // automatically released by the engine until no other references to it exist.
 877         v8::Handle<v8::Value> newv = QQmlEnginePrivate::get(ctxt->engine)->v8engine()->fromVariant(value);
 878         if (newv->IsObject()) {
 879             QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(newv));
 880             if (r) {
 881                 r->addVmePropertyReference();
 882             }
 883         }
 884
 885         // Write the value and emit change signal as appropriate.
 886         QVariant currentValue = readPropertyAsVariant(id);
 887         varProperties->Set(id - firstVarPropertyIndex, newv);
 888         if ((currentValue.userType() != value.userType() || currentValue != value))
 889             activate(object, methodOffset + id, 0);
 890     } else {
 891         bool needActivate = false;
 892         if (value.userType() == QMetaType::QObjectStar) {
 893             QObject *o = qvariant_cast<QObject *>(value);
 894             needActivate = (data[id].dataType() != QMetaType::QObjectStar || data[id].asQObject() != o);
 895             data[id].setValue(qvariant_cast<QObject *>(value));
 896         } else {
 897             needActivate = (data[id].dataType() != qMetaTypeId<QVariant>() ||
 898                             data[id].asQVariant().userType() != value.userType() ||
 899                             data[id].asQVariant() != value);
 900             data[id].setValue(value);
 901         }
 902
 903         if (needActivate)
 904             activate(object, methodOffset + id, 0);
 905     }
 906 }
 907
 908 void QQmlVMEMetaObject::listChanged(int id)
 909 {
 910     activate(object, methodOffset + id, 0);
 911 }
 912
 913 void QQmlVMEMetaObject::list_append(QQmlListProperty<QObject> *prop, QObject *o)
 914 {
 915     List *list = static_cast<List *>(prop->data);
 916     list->append(o);
 917     QMetaObject::activate(prop->object, list->notifyIndex, 0);
 918 }
 919
 920 int QQmlVMEMetaObject::list_count(QQmlListProperty<QObject> *prop)
 921 {
 922     return static_cast<List *>(prop->data)->count();
 923 }
 924
 925 QObject *QQmlVMEMetaObject::list_at(QQmlListProperty<QObject> *prop, int index)
 926 {
 927     return static_cast<List *>(prop->data)->at(index);
 928 }
 929
 930 void QQmlVMEMetaObject::list_clear(QQmlListProperty<QObject> *prop)
 931 {
 932     List *list = static_cast<List *>(prop->data);
 933     list->clear();
 934     QMetaObject::activate(prop->object, list->notifyIndex, 0);
 935 }
 936
 937 void QQmlVMEMetaObject::registerInterceptor(int index, int valueIndex, QQmlPropertyValueInterceptor *interceptor)
 938 {
 939     if (aInterceptors.isEmpty())
 940         aInterceptors.resize(propertyCount() + metaData->propertyCount);
 941     aInterceptors.setBit(index);
 942     interceptors.insert(index, qMakePair(valueIndex, interceptor));
 943 }
 944
 945 int QQmlVMEMetaObject::vmeMethodLineNumber(int index)
 946 {
 947     if (index < methodOffset) {
 948         Q_ASSERT(parent);
 949         return static_cast<QQmlVMEMetaObject *>(parent)->vmeMethodLineNumber(index);
 950     }
 951
 952     int plainSignals = metaData->signalCount + metaData->propertyCount + metaData->aliasCount;
 953     Q_ASSERT(index >= (methodOffset + plainSignals) && index < (methodOffset + plainSignals + metaData->methodCount));
 954
 955     int rawIndex = index - methodOffset - plainSignals;
 956
 957     QQmlVMEMetaData::MethodData *data = metaData->methodData() + rawIndex;
 958     return data->lineNumber;
 959 }
 960
 961 v8::Handle<v8::Function> QQmlVMEMetaObject::vmeMethod(int index)
 962 {
 963     if (index < methodOffset) {
 964         Q_ASSERT(parent);
 965         return static_cast<QQmlVMEMetaObject *>(parent)->vmeMethod(index);
 966     }
 967     int plainSignals = metaData->signalCount + metaData->propertyCount + metaData->aliasCount;
 968     Q_ASSERT(index >= (methodOffset + plainSignals) && index < (methodOffset + plainSignals + metaData->methodCount));
 969     return method(index - methodOffset - plainSignals);
 970 }
 971
 972 // Used by debugger
 973 void QQmlVMEMetaObject::setVmeMethod(int index, v8::Persistent<v8::Function> value)
 974 {
 975     if (index < methodOffset) {
 976         Q_ASSERT(parent);
 977         return static_cast<QQmlVMEMetaObject *>(parent)->setVmeMethod(index, value);
 978     }
 979     int plainSignals = metaData->signalCount + metaData->propertyCount + metaData->aliasCount;
 980     Q_ASSERT(index >= (methodOffset + plainSignals) && index < (methodOffset + plainSignals + metaData->methodCount));
 981
 982     if (!v8methods)
 983         v8methods = new v8::Persistent<v8::Function>[metaData->methodCount];
 984
 985     int methodIndex = index - methodOffset - plainSignals;
 986     if (!v8methods[methodIndex].IsEmpty())
 987         qPersistentDispose(v8methods[methodIndex]);
 988     v8methods[methodIndex] = value;
 989 }
 990
 991 v8::Handle<v8::Value> QQmlVMEMetaObject::vmeProperty(int index)
 992 {
 993     if (index < propOffset) {
 994         Q_ASSERT(parent);
 995         return static_cast<QQmlVMEMetaObject *>(parent)->vmeProperty(index);
 996     }
 997     return readVarProperty(index - propOffset);
 998 }
 999
1000 void QQmlVMEMetaObject::setVMEProperty(int index, v8::Handle<v8::Value> v)
1001 {
1002     if (index < propOffset) {
1003         Q_ASSERT(parent);
1004         static_cast<QQmlVMEMetaObject *>(parent)->setVMEProperty(index, v);
1005         return;
1006     }
1007     return writeVarProperty(index - propOffset, v);
1008 }
1009
1010 void QQmlVMEMetaObject::ensureVarPropertiesAllocated()
1011 {
1012     if (!varPropertiesInitialized)
1013         allocateVarPropertiesArray();
1014 }
1015
1016 // see also: QV8GCCallback::garbageCollectorPrologueCallback()
1017 void QQmlVMEMetaObject::allocateVarPropertiesArray()
1018 {
1019     v8::HandleScope handleScope;
1020     v8::Context::Scope cs(QQmlEnginePrivate::get(ctxt->engine)->v8engine()->context());
1021     varProperties = qPersistentNew(v8::Array::New(metaData->varPropertyCount));
1022     varProperties.MakeWeak(static_cast<void*>(this), VarPropertiesWeakReferenceCallback);
1023     varPropertiesInitialized = true;
1024 }
1025
1026 /*
1027    The "var" properties are stored in a v8::Array which will be strong persistent if the object has cpp-ownership
1028    and the root QObject in the parent chain does not have JS-ownership.  In the weak persistent handle case,
1029    this callback will dispose the handle when the v8object which owns the lifetime of the var properties array
1030    is cleared as a result of all other handles to that v8object being released.
1031    See QV8GCCallback::garbageCollectorPrologueCallback() for more information.
1032  */
1033 void QQmlVMEMetaObject::VarPropertiesWeakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
1034 {
1035     QQmlVMEMetaObject *vmemo = static_cast<QQmlVMEMetaObject*>(parameter);
1036     Q_ASSERT(vmemo);
1037     qPersistentDispose(object);
1038     vmemo->varProperties.Clear();
1039 }
1040
1041 void QQmlVMEMetaObject::GcPrologueCallback(QV8GCCallback::Node *node)
1042 {
1043     QQmlVMEMetaObject *vmemo = static_cast<QQmlVMEMetaObject*>(node);
1044     Q_ASSERT(vmemo);
1045     if (!vmemo->varPropertiesInitialized || vmemo->varProperties.IsEmpty() || !vmemo->ctxt || !vmemo->ctxt->engine)
1046         return;
1047     QQmlEnginePrivate *ep = QQmlEnginePrivate::get(vmemo->ctxt->engine);
1048     ep->v8engine()->addRelationshipForGC(vmemo->object, vmemo->varProperties);
1049 }
1050
1051 bool QQmlVMEMetaObject::aliasTarget(int index, QObject **target, int *coreIndex, int *valueTypeIndex) const
1052 {
1053     Q_ASSERT(index >= propOffset + metaData->propertyCount);
1054
1055     *target = 0;
1056     *coreIndex = -1;
1057     *valueTypeIndex = -1;
1058
1059     if (!ctxt)
1060         return false;
1061
1062     QQmlVMEMetaData::AliasData *d = metaData->aliasData() + (index - propOffset - metaData->propertyCount);
1063     QQmlContext *context = ctxt->asQQmlContext();
1064     QQmlContextPrivate *ctxtPriv = QQmlContextPrivate::get(context);
1065
1066     *target = ctxtPriv->data->idValues[d->contextIdx].data();
1067     if (!*target)
1068         return false;
1069
1070     if (d->isObjectAlias()) {
1071     } else if (d->isValueTypeAlias()) {
1072         *coreIndex = d->propertyIndex();
1073         *valueTypeIndex = d->valueTypeIndex();
1074     } else {
1075         *coreIndex = d->propertyIndex();
1076     }
1077
1078     return true;
1079 }
1080
1081 void QQmlVMEMetaObject::connectAlias(int aliasId)
1082 {
1083     if (!aConnected.testBit(aliasId)) {
1084
1085         if (!aliasEndpoints)
1086             aliasEndpoints = new QQmlVMEMetaObjectEndpoint[metaData->aliasCount];
1087
1088         aConnected.setBit(aliasId);
1089
1090         QQmlVMEMetaData::AliasData *d = metaData->aliasData() + aliasId;
1091
1092         QQmlVMEMetaObjectEndpoint *endpoint = aliasEndpoints + aliasId;
1093         endpoint->metaObject = this;
1094
1095         endpoint->connect(&ctxt->idValues[d->contextIdx].bindings);
1096
1097         endpoint->tryConnect();
1098     }
1099 }
1100
1101 void QQmlVMEMetaObject::connectAliasSignal(int index)
1102 {
1103     int aliasId = (index - methodOffset) - metaData->propertyCount;
1104     if (aliasId < 0 || aliasId >= metaData->aliasCount)
1105         return;
1106
1107     connectAlias(aliasId);
1108 }
1109
1110 QT_END_NAMESPACE