Exemple #1
0
RefPtr<ArrayBuffer> ArrayBuffer::sliceImpl(unsigned begin, unsigned end) const
{
    unsigned size = begin <= end ? end - begin : 0;
    RefPtr<ArrayBuffer> result = ArrayBuffer::create(static_cast<const char*>(data()) + begin, size);
    result->setSharingMode(sharingMode());
    return result;
}
static EncodedJSValue JSC_HOST_CALL constructArrayBuffer(ExecState* exec)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    JSArrayBufferConstructor* constructor =
        jsCast<JSArrayBufferConstructor*>(exec->jsCallee());
    
    unsigned length;
    if (exec->argumentCount()) {
        length = exec->uncheckedArgument(0).toIndex(exec, "length");
        RETURN_IF_EXCEPTION(scope, encodedJSValue());
    } else {
        // Although the documentation doesn't say so, it is in fact correct to say
        // "new ArrayBuffer()". The result is the same as allocating an array buffer
        // with a zero length.
        length = 0;
    }
    
    auto buffer = ArrayBuffer::tryCreate(length, 1);
    if (!buffer)
        return JSValue::encode(throwOutOfMemoryError(exec, scope));
    
    if (constructor->sharingMode() == ArrayBufferSharingMode::Shared)
        buffer->makeShared();
    
    ASSERT(constructor->sharingMode() == buffer->sharingMode());
    
    Structure* arrayBufferStructure = InternalFunction::createSubclassStructure(exec, exec->newTarget(), constructor->globalObject()->arrayBufferStructure(constructor->sharingMode()));
    RETURN_IF_EXCEPTION(scope, encodedJSValue());
    JSArrayBuffer* result = JSArrayBuffer::create(vm, arrayBufferStructure, WTFMove(buffer));
    
    return JSValue::encode(result);
}
Exemple #3
0
void ArrayBuffer::setSharingMode(ArrayBufferSharingMode newSharingMode)
{
    if (newSharingMode == sharingMode())
        return;
    RELEASE_ASSERT(!isShared()); // Cannot revert sharing.
    RELEASE_ASSERT(newSharingMode == ArrayBufferSharingMode::Shared);
    makeShared();
}