Backport some enum optimizations from Qt 5

(backport of 108b9bbe2ff2f5f31525408a08d248499d95a49f in qtquick1)

Saving the int when we check the enum is valid allows us to make it a
literal assignment instead of a binding, which is much faster on object
creation.

Change-Id: Ieb174289438a17574c4716df372b04d4dee6d0db
Reviewed-by: Christopher Adams <chris.adams@jollamobile.com>

1 files changed, 33 insertions, 11 deletions

diff --git a/src/declarative/qml/qdeclarativecompiler.cpp b/src/declarative/qml/qdeclarativecompiler.cpp
index 38f73f7..c46585b 100644
--- a/src/declarative/qml/qdeclarativecompiler.cpp
+++ b/src/declarative/qml/qdeclarativecompiler.cpp
@@ -326,10 +326,14 @@ void QDeclarativeCompiler::genLiteralAssignment(const QMetaProperty &prop,
     instr.line = v->location.start.line;
     if (prop.isEnumType()) {
         int value;
-        if (prop.isFlagType()) {
-            value = prop.enumerator().keysToValue(string.toUtf8().constData());
-        } else
-            value = prop.enumerator().keyToValue(string.toUtf8().constData());
+        if (v->value.isNumber()) { //Number saved from earlier check - not valid in testLiteralAssignment
+            value = v->value.asNumber();
+        } else {
+            if (prop.isFlagType())
+                value = prop.enumerator().keysToValue(string.toUtf8().constData());
+            else
+                value = prop.enumerator().keyToValue(string.toUtf8().constData());
+        }
 
         instr.type = QDeclarativeInstruction::StoreInteger;
         instr.storeInteger.propertyIndex = prop.propertyIndex();
@@ -2201,6 +2205,12 @@ bool QDeclarativeCompiler::buildPropertyLiteralAssignment(QDeclarativeParser::Pr
     return true;
 }
 
+struct StaticQtMetaObject : public QObject
+{
+    static const QMetaObject *get()
+        { return &static_cast<StaticQtMetaObject*> (0)->staticQtMetaObject; }
+};
+
 bool QDeclarativeCompiler::testQualifiedEnumAssignment(const QMetaProperty &prop,
                                               QDeclarativeParser::Object *obj,
                                               QDeclarativeParser::Value *v,
@@ -2233,20 +2243,32 @@ bool QDeclarativeCompiler::testQualifiedEnumAssignment(const QMetaProperty &prop
             objTypeName = objType->qmlTypeName();
     }
 
-    if (!type || objTypeName != type->qmlTypeName())
+    if (!type && typeName != QLatin1String("Qt"))
         return true;
 
     QString enumValue = parts.at(1);
-    int value;
-    if (prop.isFlagType()) {
-        value = prop.enumerator().keysToValue(enumValue.toUtf8().constData());
-    } else
-        value = prop.enumerator().keyToValue(enumValue.toUtf8().constData());
+    int value = -1;
+
+    if (type && objTypeName == type->qmlTypeName()) {
+        if (prop.isFlagType()) {
+            value = prop.enumerator().keysToValue(enumValue.toUtf8().constData());
+        } else {
+            value = prop.enumerator().keyToValue(enumValue.toUtf8().constData());
+        }
+    } else {
+        QByteArray enumName = enumValue.toUtf8();
+        //Special case for Qt object
+        const QMetaObject *metaObject = type ? type->metaObject() : StaticQtMetaObject::get();
+        for (int ii = metaObject->enumeratorCount() - 1; value == -1 && ii >= 0; --ii) {
+            QMetaEnum e = metaObject->enumerator(ii);
+            value = e.keyToValue(enumName.constData());
+        }
+    }
     if (value == -1)
         return true;
 
     v->type = Value::Literal;
-    v->value = QDeclarativeParser::Variant(enumValue);
+    v->value = QDeclarativeParser::Variant((double)value);
     *isAssignment = true;
 
     return true;