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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*, WrapperWorldType)
     51     {
     52         return TypedArrayTraits<TypedArray>::IsInstance(value);
     53     }
     54 
     55     static bool hasInstanceInAnyWorld(v8::Handle<v8::Value> value, v8::Isolate*)
     56     {
     57         return TypedArrayTraits<TypedArray>::IsInstance(value);
     58     }
     59 
     60     static TypedArray* toNative(v8::Handle<v8::Object>);
     61     static void derefObject(void*);
     62     static const WrapperTypeInfo wrapperTypeInfo;
     63     static const int internalFieldCount = v8DefaultWrapperInternalFieldCount;
     64 
     65     static v8::Handle<v8::Object> wrap(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
     66     {
     67         ASSERT(impl);
     68         ASSERT(!DOMDataStore::containsWrapper<Binding>(impl, isolate));
     69         return V8TypedArray<TypedArray>::createWrapper(impl, creationContext, isolate);
     70     }
     71 
     72     static v8::Handle<v8::Value> toV8(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
     73     {
     74         if (UNLIKELY(!impl))
     75             return v8::Null(isolate);
     76         v8::Handle<v8::Value> wrapper = DOMDataStore::getWrapper<Binding>(impl, isolate);
     77         if (!wrapper.IsEmpty())
     78             return wrapper;
     79         return wrap(impl, creationContext, isolate);
     80     }
     81 
     82     template<typename CallbackInfo>
     83     static void v8SetReturnValue(const CallbackInfo& info, TypedArray* impl)
     84     {
     85         if (UNLIKELY(!impl)) {
     86             v8SetReturnValueNull(info);
     87             return;
     88         }
     89         if (DOMDataStore::setReturnValueFromWrapper<Binding>(info.GetReturnValue(), impl))
     90             return;
     91         v8::Handle<v8::Object> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
     92         info.GetReturnValue().Set(wrapper);
     93     }
     94 
     95     template<typename CallbackInfo>
     96     static void v8SetReturnValueForMainWorld(const CallbackInfo& info, TypedArray* impl)
     97     {
     98         ASSERT(worldType(info.GetIsolate()) == MainWorld);
     99         if (UNLIKELY(!impl)) {
    100             v8SetReturnValueNull(info);
    101             return;
    102         }
    103         if (DOMDataStore::setReturnValueFromWrapperForMainWorld<Binding>(info.GetReturnValue(), impl))
    104             return;
    105         v8::Handle<v8::Value> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
    106         info.GetReturnValue().Set(wrapper);
    107     }
    108 
    109     template<class CallbackInfo, class Wrappable>
    110     static void v8SetReturnValueFast(const CallbackInfo& info, TypedArray* impl, Wrappable* wrappable)
    111     {
    112         if (UNLIKELY(!impl)) {
    113             v8SetReturnValueNull(info);
    114             return;
    115         }
    116         if (DOMDataStore::setReturnValueFromWrapperFast<Binding>(info.GetReturnValue(), impl, info.Holder(), wrappable))
    117             return;
    118         v8::Handle<v8::Object> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
    119         info.GetReturnValue().Set(wrapper);
    120     }
    121 
    122     static inline void* toInternalPointer(TypedArray* impl)
    123     {
    124         return impl;
    125     }
    126 private:
    127     typedef TypedArrayTraits<TypedArray> Traits;
    128     typedef typename Traits::V8Type V8Type;
    129     typedef V8TypedArray<TypedArray> Binding;
    130 
    131     static v8::Handle<v8::Object> createWrapper(PassRefPtr<TypedArray>, v8::Handle<v8::Object> creationContext, v8::Isolate*);
    132 };
    133 
    134 template<typename TypedArray>
    135 class TypedArrayWrapperTraits {
    136 public:
    137     static const WrapperTypeInfo* info() { return &V8TypedArray<TypedArray>::wrapperTypeInfo; }
    138 };
    139 
    140 
    141 template <typename TypedArray>
    142 v8::Handle<v8::Object> V8TypedArray<TypedArray>::createWrapper(PassRefPtr<TypedArray> impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
    143 {
    144     ASSERT(impl.get());
    145     ASSERT(!DOMDataStore::containsWrapper<Binding>(impl.get(), isolate));
    146 
    147     RefPtr<ArrayBuffer> buffer = impl->buffer();
    148     v8::Local<v8::Value> v8Buffer = WebCore::toV8(buffer.get(), creationContext, isolate);
    149 
    150     ASSERT(v8Buffer->IsArrayBuffer());
    151 
    152     v8::Local<v8::Object> wrapper = V8Type::New(v8Buffer.As<v8::ArrayBuffer>(), impl->byteOffset(), Traits::length(impl.get()));
    153 
    154     V8DOMWrapper::associateObjectWithWrapper<Binding>(impl, &wrapperTypeInfo, wrapper, isolate, WrapperConfiguration::Independent);
    155     return wrapper;
    156 }
    157 
    158 template <typename TypedArray>
    159 TypedArray* V8TypedArray<TypedArray>::toNative(v8::Handle<v8::Object> object)
    160 {
    161     ASSERT(Traits::IsInstance(object));
    162     void* typedarrayPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
    163     if (typedarrayPtr)
    164         return reinterpret_cast<TypedArray*>(typedarrayPtr);
    165 
    166     v8::Handle<V8Type> view = object.As<V8Type>();
    167     RefPtr<ArrayBuffer> arrayBuffer = V8ArrayBuffer::toNative(view->Buffer());
    168     RefPtr<TypedArray> typedArray = TypedArray::create(arrayBuffer, view->ByteOffset(), Traits::length(view));
    169     ASSERT(typedArray.get());
    170     V8DOMWrapper::associateObjectWithWrapper<Binding>(typedArray.release(), &wrapperTypeInfo, object, v8::Isolate::GetCurrent(), WrapperConfiguration::Independent);
    171 
    172     typedarrayPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
    173     ASSERT(typedarrayPtr);
    174     return reinterpret_cast<TypedArray*>(typedarrayPtr);
    175 }
    176 
    177 
    178 template <typename TypedArray>
    179 const WrapperTypeInfo V8TypedArray<TypedArray>::wrapperTypeInfo = {
    180     gin::kEmbedderBlink,
    181     0, V8TypedArray<TypedArray>::derefObject,
    182     0, 0, 0, 0, 0, WrapperTypeObjectPrototype
    183 };
    184 
    185 template <typename TypedArray>
    186 void V8TypedArray<TypedArray>::derefObject(void* object)
    187 {
    188     static_cast<TypedArray*>(object)->deref();
    189 }
    190 
    191 
    192 } // namespace WebCode
    193 
    194 #endif // V8TypedArrayCustom_h
    195