Optimize construct calls

Optimize construction of the internalClass for the object
being constructed.

Change-Id: Id5fc02c291664ec01c3595ae0acbb6895cc5b147
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>

3 files changed, 3 insertions, 1 deletions

diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index aa1f01636f..5372ef8f07 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -216,6 +216,7 @@ ExecutionEngine::ExecutionEngine(EvalISelFactory *factory)
 
     emptyClass =  new (classPool.allocate(sizeof(InternalClass))) InternalClass(this);
     executionContextClass = InternalClass::create(this, ExecutionContext::staticVTable(), 0);
+    constructClass = InternalClass::create(this, Object::staticVTable(), 0);
     stringClass = InternalClass::create(this, String::staticVTable(), 0);
     regExpValueClass = InternalClass::create(this, RegExp::staticVTable(), 0);
 
diff --git a/src/qml/jsruntime/qv4engine_p.h b/src/qml/jsruntime/qv4engine_p.h
index b2fd290265..8620913ae8 100644
--- a/src/qml/jsruntime/qv4engine_p.h
+++ b/src/qml/jsruntime/qv4engine_p.h
@@ -200,6 +200,7 @@ public:
     QQmlJS::MemoryPool classPool;
     InternalClass *emptyClass;
     InternalClass *executionContextClass;
+    InternalClass *constructClass;
     InternalClass *stringClass;
 
     InternalClass *objectClass;
diff --git a/src/qml/jsruntime/qv4functionobject.cpp b/src/qml/jsruntime/qv4functionobject.cpp
index 6bd56d8fb2..e048bf1646 100644
--- a/src/qml/jsruntime/qv4functionobject.cpp
+++ b/src/qml/jsruntime/qv4functionobject.cpp
@@ -540,7 +540,7 @@ InternalClass *SimpleScriptFunction::internalClassForConstructor()
     Scope scope(internalClass->engine);
     ScopedObject p(scope, proto);
     if (p)
-        classForConstructor = InternalClass::create(scope.engine, Object::staticVTable(), p.getPointer());
+        classForConstructor = internalClass->engine->constructClass->changePrototype(p.getPointer());
     else
         classForConstructor = scope.engine->objectClass;