1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 "use strict"; 29 30 var $ArrayBuffer = global.ArrayBuffer; 31 32 // ------------------------------------------------------------------- 33 34 function ArrayBufferConstructor(length) { // length = 1 35 if (%_IsConstructCall()) { 36 var byteLength = ToPositiveInteger(length, 'invalid_array_buffer_length'); 37 %ArrayBufferInitialize(this, byteLength); 38 } else { 39 throw MakeTypeError('constructor_not_function', ["ArrayBuffer"]); 40 } 41 } 42 43 function ArrayBufferGetByteLength() { 44 if (!IS_ARRAYBUFFER(this)) { 45 throw MakeTypeError('incompatible_method_receiver', 46 ['ArrayBuffer.prototype.byteLength', this]); 47 } 48 return %ArrayBufferGetByteLength(this); 49 } 50 51 // ES6 Draft 15.13.5.5.3 52 function ArrayBufferSlice(start, end) { 53 if (!IS_ARRAYBUFFER(this)) { 54 throw MakeTypeError('incompatible_method_receiver', 55 ['ArrayBuffer.prototype.slice', this]); 56 } 57 58 var relativeStart = TO_INTEGER(start); 59 var first; 60 if (relativeStart < 0) { 61 first = MathMax(this.byteLength + relativeStart, 0); 62 } else { 63 first = MathMin(relativeStart, this.byteLength); 64 } 65 var relativeEnd = IS_UNDEFINED(end) ? this.byteLength : TO_INTEGER(end); 66 var fin; 67 if (relativeEnd < 0) { 68 fin = MathMax(this.byteLength + relativeEnd, 0); 69 } else { 70 fin = MathMin(relativeEnd, this.byteLength); 71 } 72 73 if (fin < first) { 74 fin = first; 75 } 76 var newLen = fin - first; 77 // TODO(dslomov): implement inheritance 78 var result = new $ArrayBuffer(newLen); 79 80 %ArrayBufferSliceImpl(this, result, first); 81 return result; 82 } 83 84 function SetUpArrayBuffer() { 85 %CheckIsBootstrapping(); 86 87 // Set up the ArrayBuffer constructor function. 88 %SetCode($ArrayBuffer, ArrayBufferConstructor); 89 %FunctionSetPrototype($ArrayBuffer, new $Object()); 90 91 // Set up the constructor property on the ArrayBuffer prototype object. 92 %SetProperty($ArrayBuffer.prototype, "constructor", $ArrayBuffer, DONT_ENUM); 93 94 InstallGetter($ArrayBuffer.prototype, "byteLength", ArrayBufferGetByteLength); 95 96 InstallFunctions($ArrayBuffer.prototype, DONT_ENUM, $Array( 97 "slice", ArrayBufferSlice 98 )); 99 } 100 101 SetUpArrayBuffer(); 102 103 104