| // Copyright 2013 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. |
| |
| (function(global, utils) { |
| |
| "use strict"; |
| |
| %CheckIsBootstrapping(); |
| |
| // ------------------------------------------------------------------- |
| // Imports |
| |
| var GlobalArrayBuffer = global.ArrayBuffer; |
| var MakeTypeError; |
| var MaxSimple; |
| var MinSimple; |
| var SpeciesConstructor; |
| |
| utils.Import(function(from) { |
| MakeTypeError = from.MakeTypeError; |
| MaxSimple = from.MaxSimple; |
| MinSimple = from.MinSimple; |
| SpeciesConstructor = from.SpeciesConstructor; |
| }); |
| |
| // ------------------------------------------------------------------- |
| |
| function ArrayBufferGetByteLen() { |
| if (!IS_ARRAYBUFFER(this)) { |
| throw MakeTypeError(kIncompatibleMethodReceiver, |
| 'ArrayBuffer.prototype.byteLength', this); |
| } |
| return %_ArrayBufferGetByteLength(this); |
| } |
| |
| // ES6 Draft 15.13.5.5.3 |
| function ArrayBufferSlice(start, end) { |
| if (!IS_ARRAYBUFFER(this)) { |
| throw MakeTypeError(kIncompatibleMethodReceiver, |
| 'ArrayBuffer.prototype.slice', this); |
| } |
| |
| var relativeStart = TO_INTEGER(start); |
| if (!IS_UNDEFINED(end)) { |
| end = TO_INTEGER(end); |
| } |
| var first; |
| var byte_length = %_ArrayBufferGetByteLength(this); |
| if (relativeStart < 0) { |
| first = MaxSimple(byte_length + relativeStart, 0); |
| } else { |
| first = MinSimple(relativeStart, byte_length); |
| } |
| var relativeEnd = IS_UNDEFINED(end) ? byte_length : end; |
| var fin; |
| if (relativeEnd < 0) { |
| fin = MaxSimple(byte_length + relativeEnd, 0); |
| } else { |
| fin = MinSimple(relativeEnd, byte_length); |
| } |
| |
| if (fin < first) { |
| fin = first; |
| } |
| var newLen = fin - first; |
| var constructor = SpeciesConstructor(this, GlobalArrayBuffer, true); |
| var result = new constructor(newLen); |
| if (!IS_ARRAYBUFFER(result)) { |
| throw MakeTypeError(kIncompatibleMethodReceiver, |
| 'ArrayBuffer.prototype.slice', result); |
| } |
| // Checks for detached source/target ArrayBuffers are done inside of |
| // %ArrayBufferSliceImpl; the reordering of checks does not violate |
| // the spec because all exceptions thrown are TypeErrors. |
| if (result === this) { |
| throw MakeTypeError(kArrayBufferSpeciesThis); |
| } |
| if (%_ArrayBufferGetByteLength(result) < newLen) { |
| throw MakeTypeError(kArrayBufferTooShort); |
| } |
| |
| %ArrayBufferSliceImpl(this, result, first, newLen); |
| return result; |
| } |
| |
| utils.InstallGetter(GlobalArrayBuffer.prototype, "byteLength", |
| ArrayBufferGetByteLen); |
| |
| utils.InstallFunctions(GlobalArrayBuffer.prototype, DONT_ENUM, [ |
| "slice", ArrayBufferSlice |
| ]); |
| |
| }) |