Use V8 implementation of TypedArrays and DataView in Blink

Source/bindings/v8/custom/V8ArrayBufferViewCustom.h

 /*
  * Copyright (C) 2009, 2011 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
@@ skipping 19 matching lines @@
 
 #ifndef V8ArrayBufferViewCustom_h
 #define V8ArrayBufferViewCustom_h
 
 #include "bindings/v8/V8Binding.h"
 #include "bindings/v8/V8ObjectConstructor.h"
 #include "bindings/v8/custom/V8ArrayBufferCustom.h"
 #include "core/dom/ExceptionCode.h"
 
 #include "wtf/ArrayBuffer.h"
+#include "wtf/ArrayBufferView.h"
 
 namespace WebCore {
 
-const char tooLargeSize[] = "Size is too large (or is negative).";
-const char outOfRangeLengthAndOffset[] = "Index is out of range.";
 
-// Copy the elements from the source array to the typed destination array.
-// Returns true if it succeeded, otherwise returns false.
-bool copyElements(v8::Handle<v8::Object> destArray, v8::Handle<v8::Object> srcArray, uint32_t length, uint32_t offset, v8::Isolate*);
+class V8ArrayBufferView {
+public:
+    static bool HasInstance(v8::Handle<v8::Value> value, v8::Isolate*, WrapperWorldType)
+    {
+        return value->IsArrayBufferView();
+    }
+    static bool HasInstanceInAnyWorld(v8::Handle<v8::Value> value, v8::Isolate*)
+    {
+        return value->IsArrayBufferView();
+    }
+    static ArrayBufferView* toNative(v8::Handle<v8::Object>);
 
-template<class JavaScriptWrapperArrayType, class ArrayClass>
-void wrapArrayBufferView(const v8::FunctionCallbackInfo<v8::Value>& args, WrapperTypeInfo* type, ArrayClass array, v8::ExternalArrayType arrayType, bool hasIndexer)
-{
-    // Transform the holder into a wrapper object for the array.
-    ASSERT(!hasIndexer || static_cast<int32_t>(array.get()->length()) >= 0);
-    if (hasIndexer)
-        args.Holder()->SetIndexedPropertiesToExternalArrayData(array.get()->baseAddress(), arrayType, array.get()->length());
-    v8::Handle<v8::Object> wrapper = args.Holder();
-    V8DOMWrapper::associateObjectWithWrapper<JavaScriptWrapperArrayType>(array.release(), type, wrapper, args.GetIsolate(), WrapperConfiguration::Independent);
-    args.GetReturnValue().Set(wrapper);
-}
-
-// Template function used by the ArrayBufferView*Constructor callbacks.
-template<class ArrayClass, class ElementType, class JavaScriptWrapperArrayType>
-void constructWebGLArrayWithArrayBufferArgument(const v8::FunctionCallbackInfo<v8::Value>& args, WrapperTypeInfo* type, v8::ExternalArrayType arrayType, bool hasIndexer)
-{
-    ArrayBuffer* buf = V8ArrayBuffer::toNative(args[0]->ToObject());
-    if (!buf) {
-        throwTypeError("Could not convert argument 0 to a ArrayBuffer", args.GetIsolate());
-        return;
+    static inline void* toInternalPointer(ArrayBufferView* impl)
+    {
+        return impl;
     }
-    bool ok;
-    uint32_t offset = 0;
-    int argLen = args.Length();
-    if (argLen > 1) {
-        offset = toUInt32(args[1], ok);
-        if (!ok) {
-            throwTypeError("Could not convert argument 1 to a number", args.GetIsolate());
-            return;
-        }
-    }
-    uint32_t length = 0;
-    if (argLen > 2) {
-        length = toUInt32(args[2], ok);
-        if (!ok) {
-            throwTypeError("Could not convert argument 2 to a number", args.GetIsolate());
-            return;
-        }
-    } else {
-        if ((buf->byteLength() - offset) % sizeof(ElementType)) {
-            throwError(v8RangeError, "ArrayBuffer length minus the byteOffset is not a multiple of the element size.", args.GetIsolate());
-            return;
-        }
-        length = (buf->byteLength() - offset) / sizeof(ElementType);
-    }
-
-    if (static_cast<int32_t>(length) < 0) {
-        throwError(v8RangeError, tooLargeSize, args.GetIsolate());
-        return;
-    }
-
-    RefPtr<ArrayClass> array = ArrayClass::create(buf, offset, length);
-    if (!array) {
-        throwError(v8RangeError, tooLargeSize, args.GetIsolate());
-        return;
-    }
-
-    wrapArrayBufferView<JavaScriptWrapperArrayType>(args, type, array, arrayType, hasIndexer);
-}
-
-// Template function used by the ArrayBufferView*Constructor callbacks.
-template<class ArrayClass, class JavaScriptWrapperArrayType, class ElementType>
-void constructWebGLArray(const v8::FunctionCallbackInfo<v8::Value>& args, WrapperTypeInfo* type, v8::ExternalArrayType arrayType)
-{
-    if (!args.IsConstructCall()) {
-        throwTypeError("DOM object constructor cannot be called as a function.", args.GetIsolate());
-        return;
-    }
-
-    if (ConstructorMode::current() == ConstructorMode::WrapExistingObject) {
-        args.GetReturnValue().Set(args.Holder());
-        return;
-    }
-
-    int argLen = args.Length();
-    if (!argLen) {
-        // This happens when we return a previously constructed
-        // ArrayBufferView, e.g. from the call to <Type>Array.subset().
-        // The V8DOMWrapper will set the internal pointer in the
-        // created object. Unfortunately it doesn't look like it's
-        // possible to distinguish between this case and that where
-        // the user calls "new <Type>Array()" from JavaScript. We must
-        // construct an empty view to avoid crashes when fetching the
-        // length.
-        RefPtr<ArrayClass> array = ArrayClass::create(0);
-        // Do not call SetIndexedPropertiesToExternalArrayData on this
-        // object. Not only is there no point from a performance
-        // perspective, but doing so causes errors in the subset() case.
-        wrapArrayBufferView<JavaScriptWrapperArrayType>(args, type, array, arrayType, false);
-        return;
-    }
-
-    // Supported constructors:
-    // WebGL<T>Array(n) where n is an integer:
-    //   -- create an empty array of n elements
-    // WebGL<T>Array(arr) where arr is an array:
-    //   -- create a WebGL<T>Array containing the contents of "arr"
-    // WebGL<T>Array(buf, offset, length)
-    //   -- create a WebGL<T>Array pointing to the ArrayBuffer
-    //      "buf", starting at the specified offset, for the given
-    //      length
-
-    if (args[0]->IsNull()) {
-        // Invalid first argument
-        throwTypeError(args.GetIsolate());
-        return;
-    }
-
-    // See whether the first argument is a ArrayBuffer.
-    if (V8ArrayBuffer::HasInstance(args[0], args.GetIsolate(), worldType(args.GetIsolate()))) {
-        constructWebGLArrayWithArrayBufferArgument<ArrayClass, ElementType, JavaScriptWrapperArrayType>(args, type, arrayType, true);
-        return;
-    }
-
-    // See whether the first argument is the same type as impl. In that case,
-    // we can simply memcpy data from source to impl.
-    if (JavaScriptWrapperArrayType::HasInstance(args[0], args.GetIsolate(), worldType(args.GetIsolate()))) {
-        ArrayClass* source = JavaScriptWrapperArrayType::toNative(args[0]->ToObject());
-        uint32_t length = source->length();
-
-        if (static_cast<int32_t>(length) < 0) {
-            throwError(v8RangeError, tooLargeSize, args.GetIsolate());
-            return;
-        }
-
-        RefPtr<ArrayClass> array = ArrayClass::createUninitialized(length);
-        if (!array.get()) {
-            throwError(v8RangeError, tooLargeSize, args.GetIsolate());
-            return;
-        }
-
-        array->buffer()->setDeallocationObserver(V8ArrayBufferDeallocationObserver::instance());
-        v8::V8::AdjustAmountOfExternalAllocatedMemory(array->byteLength());
-
-        memcpy(array->baseAddress(), source->baseAddress(), length * sizeof(ElementType));
-
-        wrapArrayBufferView<JavaScriptWrapperArrayType>(args, type, array, arrayType, true);
-        return;
-    }
-
-    uint32_t len = 0;
-    v8::Handle<v8::Object> srcArray;
-    bool doInstantiation = false;
-
-    if (args[0]->IsObject()) {
-        srcArray = args[0]->ToObject();
-        if (srcArray.IsEmpty()) {
-            throwTypeError("Could not convert argument 0 to an array", args.GetIsolate());
-            return;
-        }
-        v8::Local<v8::Value> val = srcArray->Get(v8::String::NewSymbol("length"));
-        if (val.IsEmpty()) {
-            // Exception thrown during fetch of length property.
-            return;
-        }
-        len = toUInt32(val);
-        doInstantiation = true;
-    } else {
-        bool ok = false;
-        int32_t tempLength = toInt32(args[0], ok); // NaN/+inf/-inf returns 0, this is intended by WebIDL
-        if (ok && tempLength >= 0) {
-            len = static_cast<uint32_t>(tempLength);
-            doInstantiation = true;
-        }
-    }
-
-    if (static_cast<int32_t>(len) < 0) {
-        throwError(v8RangeError, tooLargeSize, args.GetIsolate());
-        return;
-    }
-
-    RefPtr<ArrayClass> array;
-    if (doInstantiation) {
-        if (srcArray.IsEmpty())
-            array = ArrayClass::create(len);
-        else
-            array = ArrayClass::createUninitialized(len);
-    }
-
-    if (!array.get()) {
-        throwError(v8RangeError, tooLargeSize, args.GetIsolate());
-        return;
-    }
-
-    if (doInstantiation) {
-        array->buffer()->setDeallocationObserver(V8ArrayBufferDeallocationObserver::instance());
-        v8::V8::AdjustAmountOfExternalAllocatedMemory(array->byteLength());
-    }
+};
 
 
-    // Transform the holder into a wrapper object for the array.
-    args.Holder()->SetIndexedPropertiesToExternalArrayData(array.get()->baseAddress(), arrayType, array.get()->length());
-
-    if (!srcArray.IsEmpty()) {
-        bool copied = copyElements(args.Holder(), srcArray, len, 0, args.GetIsolate());
-        if (!copied) {
-            for (unsigned i = 0; i < len; i++) {
-                v8::Local<v8::Value> val = srcArray->Get(i);
-                if (val.IsEmpty()) {
-                    // Exception thrown during fetch.
-                    return;
-                }
-                array->set(i, val->NumberValue());
-            }
-        }
-    }
-
-    v8::Handle<v8::Object> wrapper = args.Holder();
-    V8DOMWrapper::associateObjectWithWrapper<JavaScriptWrapperArrayType>(array.release(), type, wrapper, args.GetIsolate(), WrapperConfiguration::Independent);
-    args.GetReturnValue().Set(wrapper);
-}
-
-template <class CPlusPlusArrayType, class JavaScriptWrapperArrayType>
-void setWebGLArrayHelper(const v8::FunctionCallbackInfo<v8::Value>& args)
-{
-    if (args.Length() < 1) {
-        throwNotEnoughArgumentsError(args.GetIsolate());
-        return;
-    }
-
-    CPlusPlusArrayType* impl = JavaScriptWrapperArrayType::toNative(args.Holder());
-
-    if (JavaScriptWrapperArrayType::HasInstance(args[0], args.GetIsolate(), worldType(args.GetIsolate()))) {
-        // void set(in WebGL<T>Array array, [Optional] in unsigned long offset);
-        CPlusPlusArrayType* src = JavaScriptWrapperArrayType::toNative(args[0]->ToObject());
-        uint32_t offset = 0;
-        if (args.Length() == 2)
-            offset = toUInt32(args[1]);
-        if (!impl->set(src, offset)) {
-            throwError(v8RangeError, outOfRangeLengthAndOffset, args.GetIsolate());
-            return;
-        }
-        return;
-    }
-
-    if (args[0]->IsObject()) {
-        // void set(in sequence<long> array, [Optional] in unsigned long offset);
-        v8::Local<v8::Object> array = args[0]->ToObject();
-        uint32_t offset = 0;
-        if (args.Length() == 2)
-            offset = toUInt32(args[1]);
-        uint32_t length = toUInt32(array->Get(v8::String::NewSymbol("length")));
-        if (!impl->checkInboundData(offset, length)) {
-            throwError(v8RangeError, outOfRangeLengthAndOffset, args.GetIsolate());
-            return;
-        }
-        bool copied = copyElements(args.Holder(), array, length, offset, args.GetIsolate());
-        if (!copied) {
-            for (uint32_t i = 0; i < length; i++)
-                impl->set(offset + i, array->Get(i)->NumberValue());
-        }
-        return;
-    }
-
-    throwTypeError("Invalid argument", args.GetIsolate());
-}
-
-}
-
+} // namespace WebCore
 #endif // V8ArrayBufferViewCustom_h