| // 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 GlobalObject = global.Object; |
| |
| var MathMax; |
| var MathMin; |
| |
| utils.Import(function(from) { |
| MathMax = from.MathMax; |
| MathMin = from.MathMin; |
| }); |
| |
| // ------------------------------------------------------------------- |
| |
| function ArrayBufferConstructor(length) { // length = 1 |
| if (%_IsConstructCall()) { |
| var byteLength = $toPositiveInteger(length, kInvalidArrayBufferLength); |
| %ArrayBufferInitialize(this, byteLength, kNotShared); |
| } else { |
| throw MakeTypeError(kConstructorNotFunction, "ArrayBuffer"); |
| } |
| } |
| |
| 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 = 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 GlobalArrayBuffer(newLen); |
| |
| %ArrayBufferSliceImpl(this, result, first); |
| return result; |
| } |
| |
| function ArrayBufferIsViewJS(obj) { |
| return %ArrayBufferIsView(obj); |
| } |
| |
| |
| // Set up the ArrayBuffer constructor function. |
| %SetCode(GlobalArrayBuffer, ArrayBufferConstructor); |
| %FunctionSetPrototype(GlobalArrayBuffer, new GlobalObject()); |
| |
| // Set up the constructor property on the ArrayBuffer prototype object. |
| %AddNamedProperty( |
| GlobalArrayBuffer.prototype, "constructor", GlobalArrayBuffer, DONT_ENUM); |
| |
| %AddNamedProperty(GlobalArrayBuffer.prototype, |
| symbolToStringTag, "ArrayBuffer", DONT_ENUM | READ_ONLY); |
| |
| utils.InstallGetter(GlobalArrayBuffer.prototype, "byteLength", ArrayBufferGetByteLen); |
| |
| utils.InstallFunctions(GlobalArrayBuffer, DONT_ENUM, [ |
| "isView", ArrayBufferIsViewJS |
| ]); |
| |
| utils.InstallFunctions(GlobalArrayBuffer.prototype, DONT_ENUM, [ |
| "slice", ArrayBufferSlice |
| ]); |
| |
| }) |