Improve memory usage in QML/V4 engine.

* Don't create prototype Object for bindings and
  signal handlers. It is inaccessible and not required.
  This saves one Object-sized allocation per binding.
* Shrink the size of QQmlContextWrapper by removing
  the v8 member variable.
* Shrink the size of QObjectWrapper by moving the destroy
  identifier to the engine.

Change-Id: I76e84e4c0581e97a19d2e959f814ac84d9c431fa
Task-number: QTBUG-37134
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/qml/jsruntime/qv4functionobject.cpp b/src/qml/jsruntime/qv4functionobject.cpp
index 07ec94a58d..66e956e43c 100644
--- a/src/qml/jsruntime/qv4functionobject.cpp
+++ b/src/qml/jsruntime/qv4functionobject.cpp
@@ -183,14 +183,14 @@ void FunctionObject::markObjects(Managed *that, ExecutionEngine *e)
     Object::markObjects(that, e);
 }
 
-FunctionObject *FunctionObject::creatScriptFunction(ExecutionContext *scope, Function *function)
+FunctionObject *FunctionObject::creatScriptFunction(ExecutionContext *scope, Function *function, bool createProto)
 {
     if (function->needsActivation() ||
         function->compiledFunction->flags & CompiledData::Function::HasCatchOrWith ||
         function->compiledFunction->nFormals > QV4::Global::ReservedArgumentCount ||
         function->isNamedExpression())
         return new (scope->engine->memoryManager) ScriptFunction(scope, function);
-    return new (scope->engine->memoryManager) SimpleScriptFunction(scope, function);
+    return new (scope->engine->memoryManager) SimpleScriptFunction(scope, function, createProto);
 }
 
 ReturnedValue FunctionObject::protoProperty()
@@ -482,8 +482,8 @@ ReturnedValue ScriptFunction::call(Managed *that, CallData *callData)
 
 DEFINE_OBJECT_VTABLE(SimpleScriptFunction);
 
-SimpleScriptFunction::SimpleScriptFunction(ExecutionContext *scope, Function *function)
-    : FunctionObject(scope, function->name, true)
+SimpleScriptFunction::SimpleScriptFunction(ExecutionContext *scope, Function *function, bool createProto)
+    : FunctionObject(scope, function->name, createProto)
 {
     setVTable(staticVTable());