Use V8 implementation of TypedArrays and DataView in Blink

Source/bindings/v8/custom/V8TypedArrayCustom.h

+/*
+ * 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.
+ */
+
+#ifndef V8TypedArrayCustom_h
+#define V8TypedArrayCustom_h
+
+#include "bindings/v8/V8Binding.h"
+#include "bindings/v8/V8DOMWrapper.h"
+#include "bindings/v8/WrapperTypeInfo.h"
+#include "bindings/v8/custom/V8ArrayBufferCustom.h"
+
+#include "wtf/ArrayBuffer.h"
+
+#include <v8.h>
+
+namespace WebCore {
+
+template<typename T>
+class TypedArrayTraits
+{ };
+
+template<typename TypedArray>
+class V8TypedArray {
+public:
+    static bool HasInstance(v8::Handle<v8::Value> value, v8::Isolate*, WrapperWorldType)
+    {
+        return TypedArrayTraits<TypedArray>::IsInstance(value);
+    }
+
+    static bool HasInstanceInAnyWorld(v8::Handle<v8::Value> value, v8::Isolate*)
+    {
+        return TypedArrayTraits<TypedArray>::IsInstance(value);
+    }
+
+    static TypedArray* toNative(v8::Handle<v8::Object>);
+    static void derefObject(void*);
+    static WrapperTypeInfo info;
+    static const int internalFieldCount = v8DefaultWrapperInternalFieldCount;
+
+    static v8::Handle<v8::Object> wrap(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+    {
+        ASSERT(impl);
+        ASSERT((DOMDataStore::template getWrapper<Binding>(impl, isolate).IsEmpty()));
+        return V8TypedArray<TypedArray>::createWrapper(impl, creationContext, isolate);
+    }
+
+    static v8::Handle<v8::Value> toV8(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+    {
+        if (UNLIKELY(!impl))
+            return v8NullWithCheck(isolate);
+        v8::Handle<v8::Value> wrapper = DOMDataStore::getWrapper<Binding>(impl, isolate);
+        if (!wrapper.IsEmpty())
+            return wrapper;
+        return wrap(impl, creationContext, isolate);
+    }
+
+    static v8::Handle<v8::Value> toV8ForMainWorld(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+    {
+        ASSERT(worldType(isolate) == MainWorld);
+        if (UNLIKELY(!impl))
+            return v8NullWithCheck(isolate);
+        v8::Handle<v8::Value> wrapper = DOMDataStore::getWrapperForMainWorld<Binding>(impl);
+        if (!wrapper.IsEmpty())
+            return wrapper;
+        return wrap(impl, creationContext, isolate);
+    }
+
+    template<class HolderContainer, class Wrappable>
+    static v8::Handle<v8::Value> toV8Fast(TypedArray* impl, const HolderContainer& container, Wrappable* wrappable)
+    {
+        if (UNLIKELY(!impl))
+            return v8::Null(container.GetIsolate());
+        v8::Handle<v8::Object> wrapper = DOMDataStore::getWrapperFast<Binding>(impl, container, wrappable);
+        if (!wrapper.IsEmpty())
+            return wrapper;
+        return wrap(impl, container.Holder(), container.GetIsolate());
+    }
+
+    template<class HolderContainer, class Wrappable>
+    static v8::Handle<v8::Value> toV8FastForMainWorld(TypedArray* impl, const HolderContainer& container, Wrappable* wrappable)
+    {
+        ASSERT(worldType(container.GetIsolate()) == MainWorld);
+        if (UNLIKELY(!impl))
+            return v8::Null(container.GetIsolate());
+        v8::Handle<v8::Object> wrapper = DOMDataStore::getWrapperForMainWorld<Binding>(impl);
+        if (!wrapper.IsEmpty())
+            return wrapper;
+        return wrap(impl, container.Holder(), container.GetIsolate());
+    }
+
+    static inline void* toInternalPointer(TypedArray* impl)
+    {
+        return impl;
+    }
+private:
+    typedef TypedArrayTraits<TypedArray> Traits;
+    typedef typename Traits::V8Type V8Type;
+    typedef V8TypedArray<TypedArray> Binding;
+
+    static v8::Handle<v8::Object> createWrapper(PassRefPtr<TypedArray>, v8::Handle<v8::Object> creationContext, v8::Isolate*);
+};
+
+template<typename TypedArray>
+class TypedArrayWrapperTraits {
+public:
+    static WrapperTypeInfo* info() { return &V8TypedArray<TypedArray>::info; }
+};
+
+
+template <typename TypedArray>
+v8::Handle<v8::Object> V8TypedArray<TypedArray>::createWrapper(PassRefPtr<TypedArray> impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+{
+    ASSERT(impl.get());
+    ASSERT(DOMDataStore::getWrapper<Binding>(impl.get(), isolate).IsEmpty());
+
+    RefPtr<ArrayBuffer> buffer = impl->buffer();
+    v8::Local<v8::Value> v8Buffer = v8::Local<v8::Value>::New(WebCore::toV8(buffer.get(), creationContext, isolate));
+
+    ASSERT(v8Buffer->IsArrayBuffer());
+
+    v8::Local<v8::Object> wrapper = V8Type::New(v8Buffer.As<v8::ArrayBuffer>(), impl->byteOffset(), Traits::length(impl.get()));
+
+    V8DOMWrapper::associateObjectWithWrapper<Binding>(impl, &info, wrapper, isolate, WrapperConfiguration::Independent);
+    return wrapper;
+}
+
+template <typename TypedArray>
+TypedArray* V8TypedArray<TypedArray>::toNative(v8::Handle<v8::Object> object)
+{
+    ASSERT(Traits::IsInstance(object));
+    void* typedarrayPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
+    if (typedarrayPtr)
+        return reinterpret_cast<TypedArray*>(typedarrayPtr);
+
+    v8::Handle<V8Type> view = object.As<V8Type>();
+    RefPtr<ArrayBuffer> arrayBuffer = V8ArrayBuffer::toNative(view->Buffer());
+    RefPtr<TypedArray> typedArray = TypedArray::create(arrayBuffer, view->ByteOffset(), Traits::length(view));
+    ASSERT(typedArray.get());
+    V8DOMWrapper::associateObjectWithWrapper<Binding>(typedArray.release(), &info, object, v8::Isolate::GetCurrent(), WrapperConfiguration::Independent);
+
+    typedarrayPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
+    ASSERT(typedarrayPtr);
+    return reinterpret_cast<TypedArray*>(typedarrayPtr);
+}
+
+
+template <typename TypedArray>
+WrapperTypeInfo V8TypedArray<TypedArray>::info = {
+    0, V8TypedArray<TypedArray>::derefObject,
+    0, 0, 0, 0, 0, WrapperTypeObjectPrototype
+};
+
+template <typename TypedArray>
+void V8TypedArray<TypedArray>::derefObject(void* object)
+{
+    static_cast<TypedArray*>(object)->deref();
+}
+
+
+} // namespace WebCode
+
+#endif // V8TypedArrayCustom_h