Asynchronous component instantiation

This introduces two main:

    * the QML compiler executes in a separate thread
    * item instantiation can be interrupted and resumed to
      allow it to be split across multiple frames.

Task-number: QTBUG-21151
Change-Id: I9631c62bb77da3a2e0c37f0da3719533fdce4fef
Reviewed-on: http://codereview.qt-project.org/5676
Reviewed-by: Martin Jones <martin.jones@nokia.com>

1 files changed, 13 insertions, 4 deletions

diff --git a/src/declarative/qml/qdeclarativepropertycache.cpp b/src/declarative/qml/qdeclarativepropertycache.cpp
index e35fa52eed..6337750335 100644
--- a/src/declarative/qml/qdeclarativepropertycache.cpp
+++ b/src/declarative/qml/qdeclarativepropertycache.cpp
@@ -200,7 +200,7 @@ void QDeclarativePropertyCache::Data::lazyLoad(const QMetaMethod &m)
 Creates a new empty QDeclarativePropertyCache.
 */
 QDeclarativePropertyCache::QDeclarativePropertyCache(QDeclarativeEngine *e)
-: QDeclarativeCleanup(e), engine(e), parent(0), propertyIndexCacheStart(0), methodIndexCacheStart(0)
+: engine(e), parent(0), propertyIndexCacheStart(0), methodIndexCacheStart(0)
 {
     Q_ASSERT(engine);
 }
@@ -209,7 +209,7 @@ QDeclarativePropertyCache::QDeclarativePropertyCache(QDeclarativeEngine *e)
 Creates a new QDeclarativePropertyCache of \a metaObject.
 */
 QDeclarativePropertyCache::QDeclarativePropertyCache(QDeclarativeEngine *e, const QMetaObject *metaObject)
-: QDeclarativeCleanup(e), engine(e), parent(0), propertyIndexCacheStart(0), methodIndexCacheStart(0)
+: engine(e), parent(0), propertyIndexCacheStart(0), methodIndexCacheStart(0)
 {
     Q_ASSERT(engine);
     Q_ASSERT(metaObject);
@@ -223,6 +223,16 @@ QDeclarativePropertyCache::~QDeclarativePropertyCache()
 
     if (parent) parent->release();
     parent = 0;
+    engine = 0;
+}
+
+void QDeclarativePropertyCache::destroy()
+{
+    Q_ASSERT(engine || constructor.IsEmpty());
+    if (constructor.IsEmpty())
+        delete this;
+    else
+        QDeclarativeEnginePrivate::deleteInEngineThread(engine, this);
 }
 
 // This is inherited from QDeclarativeCleanup, so it should only clear the things
@@ -305,8 +315,7 @@ void QDeclarativePropertyCache::append(QDeclarativeEngine *engine, const QMetaOb
                                        Data::Flag propertyFlags, Data::Flag methodFlags, Data::Flag signalFlags)
 {
     Q_UNUSED(revision);
-
-    qPersistentDispose(constructor); // Now invalid
+    Q_ASSERT(constructor.IsEmpty()); // We should not be appending to an in-use property cache
 
     bool dynamicMetaObject = isDynamicMetaObject(metaObject);