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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
namespace arraybuffer {
// #sec-get-arraybuffer.prototype.bytelength
transitioning javascript builtin ArrayBufferPrototypeGetByteLength(
js-implicit context: NativeContext, receiver: JSAny)(): Number {
// 1. Let O be the this value.
// 2. Perform ? RequireInternalSlot(O, [[ArrayBufferData]]).
const o = Cast<JSArrayBuffer>(receiver) otherwise
ThrowTypeError(
MessageTemplate::kIncompatibleMethodReceiver,
'get ArrayBuffer.prototype.byteLength', receiver);
// 3. If IsSharedArrayBuffer(O) is true, throw a TypeError exception.
if (IsSharedArrayBuffer(o)) {
ThrowTypeError(
MessageTemplate::kIncompatibleMethodReceiver,
'get ArrayBuffer.prototype.byteLength', receiver);
}
// 4. If IsDetachedBuffer(O) is true, throw a TypeError exception.
// TODO(v8:4895): We don't actually throw here.
// 5. Let length be O.[[ArrayBufferByteLength]].
const length = o.byte_length;
// 6. Return length.
return Convert<Number>(length);
}
// #sec-get-sharedarraybuffer.prototype.bytelength
transitioning javascript builtin SharedArrayBufferPrototypeGetByteLength(
js-implicit context: NativeContext, receiver: JSAny)(): Number {
// 1. Let O be the this value.
// 2. Perform ? RequireInternalSlot(O, [[ArrayBufferData]]).
const o = Cast<JSArrayBuffer>(receiver) otherwise
ThrowTypeError(
MessageTemplate::kIncompatibleMethodReceiver,
'get SharedArrayBuffer.prototype.byteLength', receiver);
// 3. If IsSharedArrayBuffer(O) is false, throw a TypeError exception.
if (!IsSharedArrayBuffer(o)) {
ThrowTypeError(
MessageTemplate::kIncompatibleMethodReceiver,
'get SharedArrayBuffer.prototype.byteLength', receiver);
}
// 4. Let length be O.[[ArrayBufferByteLength]].
const length = o.byte_length;
// 5. Return length.
return Convert<Number>(length);
}
// #sec-arraybuffer.isview
transitioning javascript builtin ArrayBufferIsView(arg: JSAny): Boolean {
// 1. If Type(arg) is not Object, return false.
// 2. If arg has a [[ViewedArrayBuffer]] internal slot, return true.
// 3. Return false.
typeswitch (arg) {
case (JSArrayBufferView): {
return True;
}
case (JSAny): {
return False;
}
}
}
} // namespace arraybuffer
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