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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/core/v8/V8Binding.h"
     35 #include "bindings/core/v8/V8DOMWrapper.h"
     36 #include "bindings/core/v8/WrapperTypeInfo.h"
     37 #include "bindings/core/v8/custom/V8ArrayBufferCustom.h"
     38 #include "wtf/ArrayBuffer.h"
     39 #include <v8.h>
     40 
     41 namespace blink {
     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* toImpl(v8::Handle<v8::Object>);
     56     static TypedArray* toImplWithTypeCheck(v8::Isolate*, v8::Handle<v8::Value>);
     57     static void refObject(ScriptWrappableBase* internalPointer);
     58     static void derefObject(ScriptWrappableBase* internalPointer);
     59     static WrapperPersistentNode* createPersistentHandle(ScriptWrappableBase* internalPointer);
     60     static const WrapperTypeInfo wrapperTypeInfo;
     61     static const int internalFieldCount = v8DefaultWrapperInternalFieldCount;
     62 
     63     static v8::Handle<v8::Object> wrap(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
     64     {
     65         ASSERT(impl);
     66         ASSERT(!DOMDataStore::containsWrapper<Binding>(impl, isolate));
     67         return V8TypedArray<TypedArray>::createWrapper(impl, creationContext, isolate);
     68     }
     69 
     70     static v8::Handle<v8::Value> toV8(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
     71     {
     72         if (UNLIKELY(!impl))
     73             return v8::Null(isolate);
     74         v8::Handle<v8::Value> wrapper = DOMDataStore::getWrapper<Binding>(impl, isolate);
     75         if (!wrapper.IsEmpty())
     76             return wrapper;
     77         return wrap(impl, creationContext, isolate);
     78     }
     79 
     80     template<typename CallbackInfo>
     81     static void v8SetReturnValue(const CallbackInfo& info, TypedArray* impl)
     82     {
     83         if (UNLIKELY(!impl)) {
     84             v8SetReturnValueNull(info);
     85             return;
     86         }
     87         if (DOMDataStore::setReturnValueFromWrapper<Binding>(info.GetReturnValue(), impl))
     88             return;
     89         v8::Handle<v8::Object> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
     90         info.GetReturnValue().Set(wrapper);
     91     }
     92 
     93     template<typename CallbackInfo>
     94     static void v8SetReturnValueForMainWorld(const CallbackInfo& info, TypedArray* impl)
     95     {
     96         ASSERT(DOMWrapperWorld::current(info.GetIsolate()).isMainWorld());
     97         if (UNLIKELY(!impl)) {
     98             v8SetReturnValueNull(info);
     99             return;
    100         }
    101         if (DOMDataStore::setReturnValueFromWrapperForMainWorld<Binding>(info.GetReturnValue(), impl))
    102             return;
    103         v8::Handle<v8::Value> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
    104         info.GetReturnValue().Set(wrapper);
    105     }
    106 
    107     template<class CallbackInfo, class Wrappable>
    108     static void v8SetReturnValueFast(const CallbackInfo& info, TypedArray* impl, Wrappable* wrappable)
    109     {
    110         if (UNLIKELY(!impl)) {
    111             v8SetReturnValueNull(info);
    112             return;
    113         }
    114         if (DOMDataStore::setReturnValueFromWrapperFast<Binding>(info.GetReturnValue(), impl, info.Holder(), wrappable))
    115             return;
    116         v8::Handle<v8::Object> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
    117         info.GetReturnValue().Set(wrapper);
    118     }
    119 
    120     static inline ScriptWrappableBase* toScriptWrappableBase(TypedArray* impl)
    121     {
    122         return reinterpret_cast<ScriptWrappableBase*>(static_cast<void*>(impl));
    123     }
    124 
    125     static inline TypedArray* toImpl(ScriptWrappableBase* internalPointer)
    126     {
    127         return reinterpret_cast<TypedArray*>(static_cast<void*>(internalPointer));
    128     }
    129 private:
    130     typedef TypedArrayTraits<TypedArray> Traits;
    131     typedef typename Traits::V8Type V8Type;
    132     typedef V8TypedArray<TypedArray> Binding;
    133 
    134     static v8::Handle<v8::Object> createWrapper(PassRefPtr<TypedArray>, v8::Handle<v8::Object> creationContext, v8::Isolate*);
    135 };
    136 
    137 template<typename TypedArray>
    138 class TypedArrayWrapperTraits {
    139 public:
    140     static const WrapperTypeInfo* info() { return &V8TypedArray<TypedArray>::wrapperTypeInfo; }
    141 };
    142 
    143 
    144 template <typename TypedArray>
    145 v8::Handle<v8::Object> V8TypedArray<TypedArray>::createWrapper(PassRefPtr<TypedArray> impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
    146 {
    147     ASSERT(impl.get());
    148     ASSERT(!DOMDataStore::containsWrapper<Binding>(impl.get(), isolate));
    149 
    150     RefPtr<ArrayBuffer> buffer = impl->buffer();
    151     v8::Local<v8::Value> v8Buffer = blink::toV8(buffer.get(), creationContext, isolate);
    152 
    153     ASSERT(v8Buffer->IsArrayBuffer());
    154 
    155     v8::Local<v8::Object> wrapper = V8Type::New(v8Buffer.As<v8::ArrayBuffer>(), impl->byteOffset(), Traits::length(impl.get()));
    156 
    157     V8DOMWrapper::associateObjectWithWrapper<Binding>(impl, &wrapperTypeInfo, wrapper, isolate);
    158     return wrapper;
    159 }
    160 
    161 template <typename TypedArray>
    162 TypedArray* V8TypedArray<TypedArray>::toImpl(v8::Handle<v8::Object> object)
    163 {
    164     ASSERT(Traits::IsInstance(object));
    165     void* typedarrayPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
    166     if (typedarrayPtr)
    167         return reinterpret_cast<TypedArray*>(typedarrayPtr);
    168 
    169     v8::Handle<V8Type> view = object.As<V8Type>();
    170     RefPtr<ArrayBuffer> arrayBuffer = V8ArrayBuffer::toImpl(view->Buffer());
    171     RefPtr<TypedArray> typedArray = TypedArray::create(arrayBuffer, view->ByteOffset(), Traits::length(view));
    172     ASSERT(typedArray.get());
    173     V8DOMWrapper::associateObjectWithWrapper<Binding>(typedArray.release(), &wrapperTypeInfo, object, v8::Isolate::GetCurrent());
    174 
    175     typedarrayPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
    176     ASSERT(typedarrayPtr);
    177     return reinterpret_cast<TypedArray*>(typedarrayPtr);
    178 }
    179 
    180 template <typename TypedArray>
    181 TypedArray* V8TypedArray<TypedArray>::toImplWithTypeCheck(v8::Isolate* isolate, v8::Handle<v8::Value> value)
    182 {
    183     return V8TypedArray<TypedArray>::hasInstance(value, isolate) ? V8TypedArray<TypedArray>::toImpl(v8::Handle<v8::Object>::Cast(value)) : 0;
    184 }
    185 
    186 template <typename TypedArray>
    187 const WrapperTypeInfo V8TypedArray<TypedArray>::wrapperTypeInfo = {
    188     gin::kEmbedderBlink,
    189     0,
    190     V8TypedArray<TypedArray>::refObject,
    191     V8TypedArray<TypedArray>::derefObject,
    192     V8TypedArray<TypedArray>::createPersistentHandle,
    193     0, 0, 0, 0, 0, 0,
    194     WrapperTypeInfo::WrapperTypeObjectPrototype,
    195     WrapperTypeInfo::ObjectClassId,
    196     WrapperTypeInfo::Independent,
    197     WrapperTypeInfo::RefCountedObject
    198 };
    199 
    200 template <typename TypedArray>
    201 void V8TypedArray<TypedArray>::refObject(ScriptWrappableBase* internalPointer)
    202 {
    203     toImpl(internalPointer)->ref();
    204 }
    205 
    206 template <typename TypedArray>
    207 void V8TypedArray<TypedArray>::derefObject(ScriptWrappableBase* internalPointer)
    208 {
    209     toImpl(internalPointer)->deref();
    210 }
    211 
    212 template <typename TypedArray>
    213 WrapperPersistentNode* V8TypedArray<TypedArray>::createPersistentHandle(ScriptWrappableBase* internalPointer)
    214 {
    215     ASSERT_NOT_REACHED();
    216     return 0;
    217 }
    218 
    219 } // namespace blink
    220 
    221 #endif // V8TypedArrayCustom_h
    222