[ABANDONED] Enable V8 Promises

Source/bindings/v8/ScriptPromiseResolverWithContext.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "bindings/v8/ScriptPromiseResolverWithContext.h"
 
+#include "bindings/v8/V8PerIsolateData.h"
+
 namespace WebCore {
 
+namespace {
+
+// An empty function that is needed to run microtasks.
+void noop(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+}
+
+v8::Handle<v8::Function> getNoopFunction(v8::Isolate* isolate)
+{
+    static int key;
+    V8PerIsolateData* data = V8PerIsolateData::from(isolate);
+    v8::Handle<v8::FunctionTemplate> functionDescriptor = data->existingDOMTemplate(&key);
+    if (functionDescriptor.IsEmpty()) {
+        functionDescriptor = v8::FunctionTemplate::New(isolate, noop);
+        data->setDOMTemplate(&key, functionDescriptor);
+    }
+    return functionDescriptor->GetFunction();
+}
+
+} // namespace
+
 ScriptPromiseResolverWithContext::ScriptPromiseResolverWithContext(NewScriptState* scriptState)
     : ActiveDOMObject(scriptState->executionContext())
     , m_state(Pending)
     , m_scriptState(scriptState)
-    , m_timer(this, &ScriptPromiseResolverWithContext::resolveOrRejectImmediately)
+    , m_timer(this, &ScriptPromiseResolverWithContext::onTimerFired)
     , m_resolver(ScriptPromiseResolver::create(m_scriptState->executionContext())) { }
 
 void ScriptPromiseResolverWithContext::suspend()
 {
     m_timer.stop();
 }
 
 void ScriptPromiseResolverWithContext::resume()
 {
     if (m_state == Resolving || m_state == Rejecting)
         m_timer.startOneShot(0, FROM_HERE);
 }
 
 void ScriptPromiseResolverWithContext::stop()
 {
     m_timer.stop();
     clear();
 }
 
-void ScriptPromiseResolverWithContext::resolveOrRejectImmediately(Timer<ScriptPromiseResolverWithContext>*)
+void ScriptPromiseResolverWithContext::onTimerFired(Timer<ScriptPromiseResolverWithContext>*)
+{
+    RefPtr<ScriptPromiseResolverWithContext> protect(this);
+    NewScriptState::Scope scope(m_scriptState.get());
+    v8::Isolate* isolate = m_scriptState->isolate();
+    resolveOrRejectImmediately();
+
+    // Call an empty function to run microtasks.
+    // Create one-element array to make MSVC happy (C2466).
+    v8::Handle<v8::Value> args[1];
+    getNoopFunction(isolate)->Call(v8::Undefined(isolate), 0, args);

[yhirano, 2014/04/15 08:45:06]

I'm wondering if calling v8::V8::RunMicrotasks here works.
If it works, I like it more than the current code because it is more
straitforward.

[yhirano, 2014/04/15 10:33:40]

Calling an empty function violates some assertions[1]. now I call
v8::V8::RunMicrotasks directly.

1:
https://storage.googleapis.com/chromium-layout-test-archives/linux_blink_dbg/...

+}
+
+void ScriptPromiseResolverWithContext::resolveOrRejectImmediately()
 {
     ASSERT(!executionContext()->activeDOMObjectsAreStopped());
     ASSERT(!executionContext()->activeDOMObjectsAreSuspended());
     if (m_state == Resolving) {
-        NewScriptState::Scope scope(m_scriptState.get());
         m_resolver->resolve(m_value.newLocal(m_scriptState->isolate()));
     } else {
         ASSERT(m_state == Rejecting);
-        NewScriptState::Scope scope(m_scriptState.get());
         m_resolver->reject(m_value.newLocal(m_scriptState->isolate()));
     }
     m_state = ResolvedOrRejected;
     clear();
+
+    // ref() was called in resolveOrRejected.
+    deref();
 }
 
 void ScriptPromiseResolverWithContext::clear()
 {
     m_resolver.clear();
     m_value.clear();
     m_scriptState.clear();
 }
 
 } // namespace WebCore