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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 function ArrayBufferConstructor(byteLength) { // length = 1 | |
33 if (%_IsConstructCall()) { | |
34 var l = TO_POSITIVE_INTEGER(byteLength); | |
35 %ArrayBufferInitialize(this, l); | |
36 } else { | |
37 return new $ArrayBuffer(byteLength); | |
38 } | |
39 } | |
40 | |
41 function ArrayBufferGetByteLength() { | |
42 if (!IS_ARRAYBUFFER(this)) { | |
43 throw MakeTypeError('incompatible_method_receiver', | |
44 ['ArrayBuffer.prototype.byteLength', this]); | |
45 } | |
46 return %ArrayBufferGetByteLength(this); | |
47 } | |
48 | |
49 // ES6 Draft 15.13.5.5.3 | |
50 function ArrayBufferSlice(start, end) { | |
51 if (!IS_ARRAYBUFFER(this)) { | |
52 throw MakeTypeError('incompatible_method_receiver', | |
53 ['ArrayBuffer.prototype.slice', this]); | |
54 } | |
55 | |
56 var relativeStart = TO_INTEGER(start); | |
57 var first; | |
58 if (relativeStart < 0) { | |
59 first = MathMax(this.byteLength + relativeStart, 0); | |
60 } else { | |
61 first = MathMin(relativeStart, this.byteLength); | |
62 } | |
63 var relativeEnd = IS_UNDEFINED(end) ? this.byteLength : end; | |
rossberg
2013/03/27 17:33:14
Don't you have to convert 'end' to integer?
Dmitry Lomov (no reviews)
2013/03/27 18:45:00
Good catch, done and added a test
| |
64 var fin; | |
65 if (relativeEnd < 0) { | |
66 fin = MathMax(this.byteLength + relativeEnd, 0); | |
67 } else { | |
68 fin = MathMin(relativeEnd, this.byteLength); | |
69 } | |
70 | |
71 var newLen = fin - first; | |
72 // TODO(dslomov): implement inheritance | |
73 var result = new $ArrayBuffer(newLen); | |
74 | |
75 %ArrayBufferSliceImpl(this, result, first); | |
76 return result; | |
77 } | |
78 | |
79 | |
80 | |
81 // ------------------------------------------------------------------- | |
82 | |
83 (function () { | |
84 %CheckIsBootstrapping(); | |
85 | |
86 // Set up the Uint16Array constructor function. | |
87 %SetCode($ArrayBuffer, ArrayBufferConstructor); | |
88 | |
89 // Set up the constructor property on the ArrayBuffer prototype object. | |
90 %SetProperty($ArrayBuffer.prototype, "constructor", $ArrayBuffer, DONT_ENUM); | |
91 | |
92 InstallGetter($ArrayBuffer.prototype, "byteLength", ArrayBufferGetByteLength); | |
93 | |
94 InstallFunctions($ArrayBuffer.prototype, DONT_ENUM, $Array( | |
95 "slice", ArrayBufferSlice | |
96 )); | |
97 | |
98 })(); | |
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