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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef V8TypedArrayCustom_h
     32 #define V8TypedArrayCustom_h
     33 
     34 #include "bindings/v8/V8Binding.h"
     35 #include "bindings/v8/V8DOMWrapper.h"
     36 #include "bindings/v8/WrapperTypeInfo.h"
     37 #include "bindings/v8/custom/V8ArrayBufferCustom.h"
     38 #include "wtf/ArrayBuffer.h"
     39 #include <v8.h>
     40 
     41 namespace WebCore {
     42 
     43 template<typename T>
     44 class TypedArrayTraits
     45 { };
     46 
     47 template<typename TypedArray>
     48 class V8TypedArray {
     49 public:
     50     static bool hasInstance(v8::Handle<v8::Value> value, v8::Isolate*)
     51     {
     52         return TypedArrayTraits<TypedArray>::IsInstance(value);
     53     }
     54 
     55     static TypedArray* toNative(v8::Handle<v8::Object>);
     56     static TypedArray* toNativeWithTypeCheck(v8::Isolate*, v8::Handle<v8::Value>);
     57     static void derefObject(void*);
     58     static const WrapperTypeInfo wrapperTypeInfo;
     59     static const int internalFieldCount = v8DefaultWrapperInternalFieldCount;
     60 
     61     static v8::Handle<v8::Object> wrap(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
     62     {
     63         ASSERT(impl);
     64         ASSERT(!DOMDataStore::containsWrapper<Binding>(impl, isolate));
     65         return V8TypedArray<TypedArray>::createWrapper(impl, creationContext, isolate);
     66     }
     67 
     68     static v8::Handle<v8::Value> toV8(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
     69     {
     70         if (UNLIKELY(!impl))
     71             return v8::Null(isolate);
     72         v8::Handle<v8::Value> wrapper = DOMDataStore::getWrapper<Binding>(impl, isolate);
     73         if (!wrapper.IsEmpty())
     74             return wrapper;
     75         return wrap(impl, creationContext, isolate);
     76     }
     77 
     78     template<typename CallbackInfo>
     79     static void v8SetReturnValue(const CallbackInfo& info, TypedArray* impl)
     80     {
     81         if (UNLIKELY(!impl)) {
     82             v8SetReturnValueNull(info);
     83             return;
     84         }
     85         if (DOMDataStore::setReturnValueFromWrapper<Binding>(info.GetReturnValue(), impl))
     86             return;
     87         v8::Handle<v8::Object> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
     88         info.GetReturnValue().Set(wrapper);
     89     }
     90 
     91     template<typename CallbackInfo>
     92     static void v8SetReturnValueForMainWorld(const CallbackInfo& info, TypedArray* impl)
     93     {
     94         ASSERT(DOMWrapperWorld::current(info.GetIsolate()).isMainWorld());
     95         if (UNLIKELY(!impl)) {
     96             v8SetReturnValueNull(info);
     97             return;
     98         }
     99         if (DOMDataStore::setReturnValueFromWrapperForMainWorld<Binding>(info.GetReturnValue(), impl))
    100             return;
    101         v8::Handle<v8::Value> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
    102         info.GetReturnValue().Set(wrapper);
    103     }
    104 
    105     template<class CallbackInfo, class Wrappable>
    106     static void v8SetReturnValueFast(const CallbackInfo& info, TypedArray* impl, Wrappable* wrappable)
    107     {
    108         if (UNLIKELY(!impl)) {
    109             v8SetReturnValueNull(info);
    110             return;
    111         }
    112         if (DOMDataStore::setReturnValueFromWrapperFast<Binding>(info.GetReturnValue(), impl, info.Holder(), wrappable))
    113             return;
    114         v8::Handle<v8::Object> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
    115         info.GetReturnValue().Set(wrapper);
    116     }
    117 
    118     static inline void* toInternalPointer(TypedArray* impl)
    119     {
    120         return impl;
    121     }
    122 private:
    123     typedef TypedArrayTraits<TypedArray> Traits;
    124     typedef typename Traits::V8Type V8Type;
    125     typedef V8TypedArray<TypedArray> Binding;
    126 
    127     static v8::Handle<v8::Object> createWrapper(PassRefPtr<TypedArray>, v8::Handle<v8::Object> creationContext, v8::Isolate*);
    128 };
    129 
    130 template<typename TypedArray>
    131 class TypedArrayWrapperTraits {
    132 public:
    133     static const WrapperTypeInfo* info() { return &V8TypedArray<TypedArray>::wrapperTypeInfo; }
    134 };
    135 
    136 
    137 template <typename TypedArray>
    138 v8::Handle<v8::Object> V8TypedArray<TypedArray>::createWrapper(PassRefPtr<TypedArray> impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
    139 {
    140     ASSERT(impl.get());
    141     ASSERT(!DOMDataStore::containsWrapper<Binding>(impl.get(), isolate));
    142 
    143     RefPtr<ArrayBuffer> buffer = impl->buffer();
    144     v8::Local<v8::Value> v8Buffer = WebCore::toV8(buffer.get(), creationContext, isolate);
    145 
    146     ASSERT(v8Buffer->IsArrayBuffer());
    147 
    148     v8::Local<v8::Object> wrapper = V8Type::New(v8Buffer.As<v8::ArrayBuffer>(), impl->byteOffset(), Traits::length(impl.get()));
    149 
    150     V8DOMWrapper::associateObjectWithWrapper<Binding>(impl, &wrapperTypeInfo, wrapper, isolate, WrapperConfiguration::Independent);
    151     return wrapper;
    152 }
    153 
    154 template <typename TypedArray>
    155 TypedArray* V8TypedArray<TypedArray>::toNative(v8::Handle<v8::Object> object)
    156 {
    157     ASSERT(Traits::IsInstance(object));
    158     void* typedarrayPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
    159     if (typedarrayPtr)
    160         return reinterpret_cast<TypedArray*>(typedarrayPtr);
    161 
    162     v8::Handle<V8Type> view = object.As<V8Type>();
    163     RefPtr<ArrayBuffer> arrayBuffer = V8ArrayBuffer::toNative(view->Buffer());
    164     RefPtr<TypedArray> typedArray = TypedArray::create(arrayBuffer, view->ByteOffset(), Traits::length(view));
    165     ASSERT(typedArray.get());
    166     V8DOMWrapper::associateObjectWithWrapper<Binding>(typedArray.release(), &wrapperTypeInfo, object, v8::Isolate::GetCurrent(), WrapperConfiguration::Independent);
    167 
    168     typedarrayPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
    169     ASSERT(typedarrayPtr);
    170     return reinterpret_cast<TypedArray*>(typedarrayPtr);
    171 }
    172 
    173 template <typename TypedArray>
    174 TypedArray* V8TypedArray<TypedArray>::toNativeWithTypeCheck(v8::Isolate* isolate, v8::Handle<v8::Value> value)
    175 {
    176     return V8TypedArray<TypedArray>::hasInstance(value, isolate) ? V8TypedArray<TypedArray>::toNative(v8::Handle<v8::Object>::Cast(value)) : 0;
    177 }
    178 
    179 template <typename TypedArray>
    180 const WrapperTypeInfo V8TypedArray<TypedArray>::wrapperTypeInfo = {
    181     gin::kEmbedderBlink,
    182     0, V8TypedArray<TypedArray>::derefObject,
    183     0, 0, 0, 0, 0, WrapperTypeObjectPrototype, RefCountedObject
    184 };
    185 
    186 template <typename TypedArray>
    187 void V8TypedArray<TypedArray>::derefObject(void* object)
    188 {
    189     static_cast<TypedArray*>(object)->deref();
    190 }
    191 
    192 
    193 } // namespace WebCode
    194 
    195 #endif // V8TypedArrayCustom_h
    196