src/third_party/blink/Source/bindings/core/v8/V8WorkerGlobalScopeEventListener.cpp

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#include "config.h"

#include "bindings/core/v8/V8WorkerGlobalScopeEventListener.h"

#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/V8DOMWrapper.h"
#include "bindings/core/v8/V8Event.h"
#include "bindings/core/v8/V8EventTarget.h"
#include "bindings/core/v8/V8GCController.h"
#include "bindings/core/v8/V8ScriptRunner.h"
#include "bindings/core/v8/WorkerScriptController.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/inspector/InspectorTraceEvents.h"
#include "core/workers/WorkerGlobalScope.h"

namespace blink {

V8WorkerGlobalScopeEventListener::V8WorkerGlobalScopeEventListener(v8::Local<v8::Object> listener, bool isInline, ScriptState* scriptState)
    : V8EventListener(listener, isInline, scriptState)
{
}

void V8WorkerGlobalScopeEventListener::handleEvent(ExecutionContext*, Event* event)
{
    // The callback function on XMLHttpRequest can clear the event listener and destroys 'this' object. Keep a local reference to it.
    // See issue 889829.
    RefPtr<V8AbstractEventListener> protect(this);

    WorkerScriptController* script = toWorkerGlobalScope(scriptState()->executionContext())->script();
    if (!script)
        return;

    if (!scriptState()->contextIsValid())
        return;
    ScriptState::Scope scope(scriptState());

    // Get the V8 wrapper for the event object.
    v8::Handle<v8::Value> jsEvent = toV8(event, scriptState()->context()->Global(), isolate());

    invokeEventHandler(event, v8::Local<v8::Value>::New(isolate(), jsEvent));
}

v8::Local<v8::Value> V8WorkerGlobalScopeEventListener::callListenerFunction(v8::Handle<v8::Value> jsEvent, Event* event)
{
    v8::Local<v8::Function> handlerFunction = getListenerFunction(scriptState()->executionContext());
    v8::Local<v8::Object> receiver = getReceiverObject(event);
    if (handlerFunction.IsEmpty() || receiver.IsEmpty())
        return v8::Local<v8::Value>();

    TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "FunctionCall", "data", devToolsTraceEventData(isolate(), scriptState()->executionContext(), handlerFunction));
    TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline.stack"), "CallStack", "stack", InspectorCallStackEvent::currentCallStack());
    // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
    InspectorInstrumentationCookie cookie;
    if (InspectorInstrumentation::timelineAgentEnabled(scriptState()->executionContext())) {
        int scriptId = 0;
        String resourceName;
        int lineNumber = 1;
        GetDevToolsFunctionInfo(handlerFunction, isolate(), scriptId, resourceName, lineNumber);
        cookie = InspectorInstrumentation::willCallFunction(scriptState()->executionContext(), scriptId, resourceName, lineNumber);
    }

    v8::Handle<v8::Value> parameters[1] = { jsEvent };
    v8::Local<v8::Value> result = V8ScriptRunner::callFunction(handlerFunction, scriptState()->executionContext(), receiver, WTF_ARRAY_LENGTH(parameters), parameters, isolate());

    InspectorInstrumentation::didCallFunction(cookie);
    TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "UpdateCounters", "data", InspectorUpdateCountersEvent::data());

    return result;
}

v8::Local<v8::Object> V8WorkerGlobalScopeEventListener::getReceiverObject(Event* event)
{
    v8::Local<v8::Object> listener = getListenerObject(scriptState()->executionContext());

    if (!listener.IsEmpty() && !listener->IsFunction())
        return listener;

    EventTarget* target = event->currentTarget();
    v8::Handle<v8::Value> value = toV8(target, scriptState()->context()->Global(), isolate());
    if (value.IsEmpty())
        return v8::Local<v8::Object>();
    return v8::Local<v8::Object>::New(isolate(), v8::Handle<v8::Object>::Cast(value));
}

} // namespace blink