void V8AbstractEventListener::invokeEventHandler(ExecutionContext* context, Event* event, v8::Local<v8::Value> jsEvent)
{
// If jsEvent is empty, attempt to set it as a hidden value would crash v8.
if (jsEvent.IsEmpty())
return;
v8::Local<v8::Context> v8Context = toV8Context(context, world());
if (v8Context.IsEmpty())
return;
// We push the event being processed into the global object, so that it can be exposed by DOMWindow's bindings.
v8::Handle<v8::String> eventSymbol = v8AtomicString(v8Context->GetIsolate(), "event");
v8::Local<v8::Value> returnValue;
{
// Catch exceptions thrown in the event handler so they do not propagate to javascript code that caused the event to fire.
v8::TryCatch tryCatch;
tryCatch.SetVerbose(true);
// Save the old 'event' property so we can restore it later.
v8::Local<v8::Value> savedEvent = getHiddenValue(v8Context->GetIsolate(), v8Context->Global(), eventSymbol);
tryCatch.Reset();
// Make the event available in the global object, so DOMWindow can expose it.
setHiddenValue(v8Context->GetIsolate(), v8Context->Global(), eventSymbol, jsEvent);
tryCatch.Reset();
returnValue = callListenerFunction(context, jsEvent, event);
if (tryCatch.HasCaught())
event->target()->uncaughtExceptionInEventHandler();
if (!tryCatch.CanContinue()) { // Result of TerminateExecution().
if (context->isWorkerGlobalScope())
toWorkerGlobalScope(context)->script()->forbidExecution();
return;
}
tryCatch.Reset();
// Restore the old event. This must be done for all exit paths through this method.
if (savedEvent.IsEmpty())
setHiddenValue(v8Context->GetIsolate(), v8Context->Global(), eventSymbol, v8::Undefined(v8Context->GetIsolate()));
else
setHiddenValue(v8Context->GetIsolate(), v8Context->Global(), eventSymbol, savedEvent);
tryCatch.Reset();
}
ASSERT(!handleOutOfMemory() || returnValue.IsEmpty());
if (returnValue.IsEmpty())
return;
if (!returnValue->IsNull() && !returnValue->IsUndefined() && event->isBeforeUnloadEvent()) {
V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, stringReturnValue, returnValue);
toBeforeUnloadEvent(event)->setReturnValue(stringReturnValue);
}
if (m_isAttribute && shouldPreventDefault(returnValue))
event->preventDefault();
}
void V8AbstractEventListener::invokeEventHandler(Event* event, v8::Local<v8::Value> jsEvent)
{
// If jsEvent is empty, attempt to set it as a hidden value would crash v8.
if (jsEvent.IsEmpty())
return;
ASSERT(!scriptState()->contextIsEmpty());
v8::Local<v8::Value> returnValue;
{
// Catch exceptions thrown in the event handler so they do not propagate to javascript code that caused the event to fire.
v8::TryCatch tryCatch;
tryCatch.SetVerbose(true);
// Save the old 'event' property so we can restore it later.
v8::Local<v8::Value> savedEvent = V8HiddenValue::getHiddenValue(isolate(), scriptState()->context()->Global(), V8HiddenValue::event(isolate()));
tryCatch.Reset();
// Make the event available in the global object, so LocalDOMWindow can expose it.
V8HiddenValue::setHiddenValue(isolate(), scriptState()->context()->Global(), V8HiddenValue::event(isolate()), jsEvent);
tryCatch.Reset();
returnValue = callListenerFunction(jsEvent, event);
if (tryCatch.HasCaught())
event->target()->uncaughtExceptionInEventHandler();
if (!tryCatch.CanContinue()) { // Result of TerminateExecution().
if (scriptState()->executionContext()->isWorkerGlobalScope())
toWorkerGlobalScope(scriptState()->executionContext())->script()->forbidExecution();
return;
}
tryCatch.Reset();
// Restore the old event. This must be done for all exit paths through this method.
if (savedEvent.IsEmpty())
V8HiddenValue::setHiddenValue(isolate(), scriptState()->context()->Global(), V8HiddenValue::event(isolate()), v8::Undefined(isolate()));
else
V8HiddenValue::setHiddenValue(isolate(), scriptState()->context()->Global(), V8HiddenValue::event(isolate()), savedEvent);
tryCatch.Reset();
}
if (returnValue.IsEmpty())
return;
if (m_isAttribute && !returnValue->IsNull() && !returnValue->IsUndefined() && event->isBeforeUnloadEvent()) {
TOSTRING_VOID(V8StringResource<>, stringReturnValue, returnValue);
toBeforeUnloadEvent(event)->setReturnValue(stringReturnValue);
}
if (m_isAttribute && shouldPreventDefault(returnValue))
event->preventDefault();
}
void JSEventListener::handleEvent(ScriptExecutionContext* scriptExecutionContext, Event* event)
{
ASSERT(scriptExecutionContext);
if (!scriptExecutionContext || scriptExecutionContext->isJSExecutionForbidden())
return;
JSLockHolder lock(scriptExecutionContext->vm());
JSObject* jsFunction = this->jsFunction(scriptExecutionContext);
if (!jsFunction)
return;
JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(scriptExecutionContext, *m_isolatedWorld);
if (!globalObject)
return;
if (scriptExecutionContext->isDocument()) {
JSDOMWindow* window = jsCast<JSDOMWindow*>(globalObject);
if (!window->impl().isCurrentlyDisplayedInFrame())
return;
// FIXME: Is this check needed for other contexts?
ScriptController& script = window->impl().frame()->script();
if (!script.canExecuteScripts(AboutToExecuteScript) || script.isPaused())
return;
}
ExecState* exec = globalObject->globalExec();
JSValue handleEventFunction = jsFunction;
CallData callData;
CallType callType = getCallData(handleEventFunction, callData);
// If jsFunction is not actually a function, see if it implements the EventListener interface and use that
if (callType == CallTypeNone) {
handleEventFunction = jsFunction->get(exec, Identifier(exec, "handleEvent"));
callType = getCallData(handleEventFunction, callData);
}
if (callType != CallTypeNone) {
Ref<JSEventListener> protect(*this);
MarkedArgumentBuffer args;
args.append(toJS(exec, globalObject, event));
Event* savedEvent = globalObject->currentEvent();
globalObject->setCurrentEvent(event);
VM& vm = globalObject->vm();
VMEntryScope entryScope(vm, vm.entryScope ? vm.entryScope->globalObject() : globalObject);
InspectorInstrumentationCookie cookie = JSMainThreadExecState::instrumentFunctionCall(scriptExecutionContext, callType, callData);
JSValue thisValue = handleEventFunction == jsFunction ? toJS(exec, globalObject, event->currentTarget()) : jsFunction;
JSValue retval = scriptExecutionContext->isDocument()
? JSMainThreadExecState::call(exec, handleEventFunction, callType, callData, thisValue, args)
: JSC::call(exec, handleEventFunction, callType, callData, thisValue, args);
InspectorInstrumentation::didCallFunction(cookie);
globalObject->setCurrentEvent(savedEvent);
if (scriptExecutionContext->isWorkerGlobalScope()) {
bool terminatorCausedException = (exec->hadException() && isTerminatedExecutionException(exec->exception()));
if (terminatorCausedException || vm.watchdog.didFire())
static_cast<WorkerGlobalScope*>(scriptExecutionContext)->script()->forbidExecution();
}
if (exec->hadException()) {
event->target()->uncaughtExceptionInEventHandler();
reportCurrentException(exec);
} else {
if (!retval.isUndefinedOrNull() && event->isBeforeUnloadEvent())
toBeforeUnloadEvent(event)->setReturnValue(retval.toString(exec)->value(exec));
if (m_isAttribute) {
if (retval.isFalse())
event->preventDefault();
}
}
}
}
