void JSObject::defineSetter(ExecState* exec, const Identifier& propertyName, JSObject* setterFunction)
{
JSValuePtr object = getDirect(propertyName);
if (object && object->isGetterSetter()) {
ASSERT(m_structure->hasGetterSetterProperties());
asGetterSetter(object)->setSetter(setterFunction);
return;
}
PutPropertySlot slot;
GetterSetter* getterSetter = new (exec) GetterSetter;
putDirect(propertyName, getterSetter, None, true, slot);
// putDirect will change our Structure if we add a new property. For
// getters and setters, though, we also need to change our Structure
// if we override an existing non-getter or non-setter.
if (slot.type() != PutPropertySlot::NewProperty) {
if (!m_structure->isDictionary()) {
RefPtr<Structure> structure = Structure::getterSetterTransition(m_structure);
setStructure(structure.release());
}
}
m_structure->setHasGetterSetterProperties(true);
getterSetter->setSetter(setterFunction);
}
static ALWAYS_INLINE JSValuePtr callDefaultValueFunction(ExecState* exec, const JSObject* object, const Identifier& propertyName)
{
JSValuePtr function = object->get(exec, propertyName);
CallData callData;
CallType callType = function->getCallData(callData);
if (callType == CallTypeNone)
return exec->exception();
// Prevent "toString" and "valueOf" from observing execution if an exception
// is pending.
if (exec->hadException())
return exec->exception();
JSValuePtr result = call(exec, function, callType, callData, const_cast<JSObject*>(object), exec->emptyList());
ASSERT(!result->isGetterSetter());
if (exec->hadException())
return exec->exception();
if (result->isObject())
return noValue();
return result;
}