| // 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. |
| |
| "use strict"; |
| |
| var $ArrayBuffer = global.ArrayBuffer; |
| |
| // ------------------------------------------------------------------- |
| |
| function ArrayBufferConstructor(length) { // length = 1 |
| if (%_IsConstructCall()) { |
| var byteLength = ToPositiveInteger(length, 'invalid_array_buffer_length'); |
| %ArrayBufferInitialize(this, byteLength); |
| } else { |
| throw MakeTypeError('constructor_not_function', ["ArrayBuffer"]); |
| } |
| } |
| |
| function ArrayBufferGetByteLen() { |
| if (!IS_ARRAYBUFFER(this)) { |
| throw MakeTypeError('incompatible_method_receiver', |
| ['ArrayBuffer.prototype.byteLength', this]); |
| } |
| return %_ArrayBufferGetByteLength(this); |
| } |
| |
| // ES6 Draft 15.13.5.5.3 |
| function ArrayBufferSlice(start, end) { |
| if (!IS_ARRAYBUFFER(this)) { |
| throw MakeTypeError('incompatible_method_receiver', |
| ['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 = MathMax(byte_length + relativeStart, 0); |
| } else { |
| first = MathMin(relativeStart, byte_length); |
| } |
| var relativeEnd = IS_UNDEFINED(end) ? byte_length : end; |
| var fin; |
| if (relativeEnd < 0) { |
| fin = MathMax(byte_length + relativeEnd, 0); |
| } else { |
| fin = MathMin(relativeEnd, byte_length); |
| } |
| |
| if (fin < first) { |
| fin = first; |
| } |
| var newLen = fin - first; |
| // TODO(dslomov): implement inheritance |
| var result = new $ArrayBuffer(newLen); |
| |
| %ArrayBufferSliceImpl(this, result, first); |
| return result; |
| } |
| |
| function ArrayBufferIsViewJS(obj) { |
| return %ArrayBufferIsView(obj); |
| } |
| |
| function SetUpArrayBuffer() { |
| %CheckIsBootstrapping(); |
| |
| // Set up the ArrayBuffer constructor function. |
| %SetCode($ArrayBuffer, ArrayBufferConstructor); |
| %FunctionSetPrototype($ArrayBuffer, new $Object()); |
| |
| // Set up the constructor property on the ArrayBuffer prototype object. |
| %AddNamedProperty( |
| $ArrayBuffer.prototype, "constructor", $ArrayBuffer, DONT_ENUM); |
| |
| InstallGetter($ArrayBuffer.prototype, "byteLength", ArrayBufferGetByteLen); |
| |
| InstallFunctions($ArrayBuffer, DONT_ENUM, $Array( |
| "isView", ArrayBufferIsViewJS |
| )); |
| |
| InstallFunctions($ArrayBuffer.prototype, DONT_ENUM, $Array( |
| "slice", ArrayBufferSlice |
| )); |
| } |
| |
| SetUpArrayBuffer(); |