/*!
\internal
\since 4.5
Adds the given \a object to the front of this context's scope chain.
If \a object is not an object, this function does nothing.
*/
void QScriptContext::pushScope(const QScriptValue &object)
{
activationObject(); //ensure the creation of the normal scope for native context
if (!object.isObject())
return;
else if (object.engine() != engine()) {
qWarning("QScriptContext::pushScope() failed: "
"cannot push an object created in "
"a different engine");
return;
}
JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
QScriptEnginePrivate *engine = QScript::scriptEngineFromExec(frame);
QScript::APIShim shim(engine);
JSC::JSObject *jscObject = JSC::asObject(engine->scriptValueToJSCValue(object));
if (jscObject == engine->originalGlobalObjectProxy)
jscObject = engine->originalGlobalObject();
JSC::ScopeChainNode *scope = frame->scopeChain();
Q_ASSERT(scope != 0);
if (!scope->object) {
// pushing to an "empty" chain
if (!jscObject->isGlobalObject()) {
qWarning("QScriptContext::pushScope() failed: initial object in scope chain has to be the Global Object");
return;
}
scope->object = jscObject;
}
else
frame->setScopeChain(scope->push(jscObject));
}
/*!
Returns the callee. The callee is the function object that this
QScriptContext represents an invocation of.
*/
QScriptValue QScriptContext::callee() const
{
const JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
QScriptEnginePrivate *eng = QScript::scriptEngineFromExec(frame);
QScript::APIShim shim(eng);
if (frame->callee() == eng->originalGlobalObject()) {
// This is a pushContext()-created context; the callee is a lie.
Q_ASSERT(QScriptEnginePrivate::contextFlags(const_cast<JSC::CallFrame*>(frame)) & QScriptEnginePrivate::NativeContext);
return QScriptValue();
}
return eng->scriptValueFromJSCValue(frame->callee());
}
/*!
Sets the activation object of this QScriptContext to be the given \a
activation.
If \a activation is not an object, this function does nothing.
\note For a context corresponding to a JavaScript function, this is only
guaranteed to work if there was an QScriptEngineAgent active on the
engine while the function was evaluated.
*/
void QScriptContext::setActivationObject(const QScriptValue &activation)
{
if (!activation.isObject())
return;
else if (activation.engine() != engine()) {
qWarning("QScriptContext::setActivationObject() failed: "
"cannot set an object created in "
"a different engine");
return;
}
JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
QScriptEnginePrivate *engine = QScript::scriptEngineFromExec(frame);
QScript::APIShim shim(engine);
JSC::JSObject *object = JSC::asObject(engine->scriptValueToJSCValue(activation));
if (object == engine->originalGlobalObjectProxy)
object = engine->originalGlobalObject();
uint flags = QScriptEnginePrivate::contextFlags(frame);
if ((flags & QScriptEnginePrivate::NativeContext) && !(flags & QScriptEnginePrivate::HasScopeContext)) {
//For native functions, we create a scope node
JSC::JSObject *scope = object;
if (!scope->isVariableObject()) {
// Create a QScriptActivationObject that acts as a proxy
scope = new (frame) QScript::QScriptActivationObject(frame, scope);
}
frame->setScopeChain(frame->scopeChain()->copy()->push(scope));
QScriptEnginePrivate::setContextFlags(frame, flags | QScriptEnginePrivate::HasScopeContext);
return;
}
// else replace the first activation object in the scope chain
JSC::ScopeChainNode *node = frame->scopeChain();
while (node != 0) {
if (node->object && node->object->isVariableObject()) {
if (!object->isVariableObject()) {
if (node->object->inherits(&QScript::QScriptActivationObject::info)) {
static_cast<QScript::QScriptActivationObject*>(node->object)->setDelegate(object);
} else {
// Create a QScriptActivationObject that acts as a proxy
node->object = new (frame) QScript::QScriptActivationObject(frame, object);
}
} else {
node->object = object;
}
break;
}
node = node->next;
}
}
