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

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  30
  31 #include "config.h"
  32
  33 #include "bindings/core/v8/V8WorkerGlobalScopeEventListener.h"
  34
  35 #include "bindings/core/v8/V8Binding.h"
  36 #include "bindings/core/v8/V8DOMWrapper.h"
  37 #include "bindings/core/v8/V8Event.h"
  38 #include "bindings/core/v8/V8EventTarget.h"
  39 #include "bindings/core/v8/V8GCController.h"
  40 #include "bindings/core/v8/V8ScriptRunner.h"
  41 #include "bindings/core/v8/WorkerScriptController.h"
  42 #include "core/inspector/InspectorInstrumentation.h"
  43 #include "core/inspector/InspectorTraceEvents.h"
  44 #include "core/workers/WorkerGlobalScope.h"
  45
  46 namespace blink {
  47
  48 V8WorkerGlobalScopeEventListener::V8WorkerGlobalScopeEventListener(v8::Local<v8::Object> listener, bool isInline, ScriptState* scriptState)
  49     : V8EventListener(listener, isInline, scriptState)
  50 {
  51 }
  52
  53 void V8WorkerGlobalScopeEventListener::handleEvent(ExecutionContext*, Event* event)
  54 {
  55     // The callback function on XMLHttpRequest can clear the event listener and destroys 'this' object. Keep a local reference to it.
  56     // See issue 889829.
  57     RefPtr<V8AbstractEventListener> protect(this);
  58
  59     WorkerScriptController* script = toWorkerGlobalScope(scriptState()->executionContext())->script();
  60     if (!script)
  61         return;
  62
  63     if (scriptState()->contextIsEmpty())
  64         return;
  65     ScriptState::Scope scope(scriptState());
  66
  67     // Get the V8 wrapper for the event object.
  68     v8::Handle<v8::Value> jsEvent = toV8(event, scriptState()->context()->Global(), isolate());
  69
  70     invokeEventHandler(event, v8::Local<v8::Value>::New(isolate(), jsEvent));
  71 }
  72
  73 v8::Local<v8::Value> V8WorkerGlobalScopeEventListener::callListenerFunction(v8::Handle<v8::Value> jsEvent, Event* event)
  74 {
  75     v8::Local<v8::Function> handlerFunction = getListenerFunction(scriptState()->executionContext());
  76     v8::Local<v8::Object> receiver = getReceiverObject(event);
  77     if (handlerFunction.IsEmpty() || receiver.IsEmpty())
  78         return v8::Local<v8::Value>();
  79
  80     TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "FunctionCall", "data", devToolsTraceEventData(scriptState()->executionContext(), handlerFunction, isolate()));
  81     TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline.stack"), "CallStack", "stack", InspectorCallStackEvent::currentCallStack());
  82     // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
  83     InspectorInstrumentationCookie cookie;
  84     if (InspectorInstrumentation::timelineAgentEnabled(scriptState()->executionContext())) {
  85         int scriptId = 0;
  86         String resourceName;
  87         int lineNumber = 1;
  88         GetDevToolsFunctionInfo(handlerFunction, isolate(), scriptId, resourceName, lineNumber);
  89         cookie = InspectorInstrumentation::willCallFunction(scriptState()->executionContext(), scriptId, resourceName, lineNumber);
  90     }
  91
  92     v8::Handle<v8::Value> parameters[1] = { jsEvent };
  93     v8::Local<v8::Value> result = V8ScriptRunner::callFunction(handlerFunction, scriptState()->executionContext(), receiver, WTF_ARRAY_LENGTH(parameters), parameters, isolate());
  94
  95     InspectorInstrumentation::didCallFunction(cookie);
  96     TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "UpdateCounters", "data", InspectorUpdateCountersEvent::data());
  97
  98     return result;
  99 }
 100
 101 v8::Local<v8::Object> V8WorkerGlobalScopeEventListener::getReceiverObject(Event* event)
 102 {
 103     v8::Local<v8::Object> listener = getListenerObject(scriptState()->executionContext());
 104
 105     if (!listener.IsEmpty() && !listener->IsFunction())
 106         return listener;
 107
 108     EventTarget* target = event->currentTarget();
 109     v8::Handle<v8::Value> value = toV8(target, scriptState()->context()->Global(), isolate());
 110     if (value.IsEmpty())
 111         return v8::Local<v8::Object>();
 112     return v8::Local<v8::Object>::New(isolate(), v8::Handle<v8::Object>::Cast(value));
 113 }
 114
 115 } // namespace blink