Introduce Promises.

Source/bindings/v8/custom/V8PromiseCustom.cpp

Index: Source/bindings/v8/custom/V8PromiseCustom.cpp
diff --git a/Source/bindings/v8/custom/V8PromiseCustom.cpp b/Source/bindings/v8/custom/V8PromiseCustom.cpp
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+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "bindings/v8/custom/V8PromiseCustom.h"
+
+#include "V8Promise.h"
+#include "V8PromiseResolver.h"
+#include "bindings/v8/V8Binding.h"
+#include "bindings/v8/V8ScriptRunner.h"
+#include "bindings/v8/WrapperTypeInfo.h"
+#include <v8.h>
+
+namespace WebCore {
+
+void V8Promise::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>& args)
+{
+    v8SetReturnValue(args, v8::Local<v8::Value>());
+    v8::Isolate* isolate = args.GetIsolate();
+    if (!args.Length() || args[0].IsEmpty() || !args[0]->IsFunction()) {
+        throwTypeError("Promise constructor takes a function argument", isolate);
+        return;
+    }
+    v8::Handle<v8::Function> init = args[0].As<v8::Function>();
+    v8::Local<v8::ObjectTemplate> internalTemplate = v8::ObjectTemplate::New();
+    internalTemplate->SetInternalFieldCount(V8PromiseCustom::InternalFieldCount);
+    v8::Local<v8::Object> internal = internalTemplate->NewInstance();
+    v8::Local<v8::Object> promise = V8DOMWrapper::createWrapper(args.Holder(), &V8Promise::info, 0, isolate);
+    v8::Local<v8::Object> promiseResolver = V8DOMWrapper::createWrapper(args.Holder(), &V8PromiseResolver::info, 0, isolate);
+
+    internal->SetInternalField(V8PromiseCustom::InternalStateIndex, v8::NumberObject::New(V8PromiseCustom::Pending));
+    internal->SetInternalField(V8PromiseCustom::InternalResultIndex, v8::Undefined());
+    internal->SetInternalField(V8PromiseCustom::InternalFulfillCallbackIndex, v8::Array::New());
+    internal->SetInternalField(V8PromiseCustom::InternalRejectCallbackIndex, v8::Array::New());
+
+    promise->SetInternalField(v8DOMWrapperObjectIndex, internal);
+    promiseResolver->SetInternalField(v8DOMWrapperObjectIndex, internal);
+
+    v8::Handle<v8::Value> argv[] = {
+        promiseResolver,
+    };
+    v8::TryCatch trycatch;
+    if (V8ScriptRunner::callFunction(init, getScriptExecutionContext(), promise, WTF_ARRAY_LENGTH(argv), argv).IsEmpty()) {
+        // FIXME: An exception is thrown. Reject the promise.
+    }
+    v8SetReturnValue(args, promise);
+    return;
+}
+
+} // namespace WebCore