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Issue 2697013009: Move ArrayBuffer.prototype.slice implementation to C++ (Closed)
Patch Set: merge master Created 3 years, 9 months ago
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1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 (function(global, utils) {
6
7 "use strict";
8
9 %CheckIsBootstrapping();
10
11 // -------------------------------------------------------------------
12 // Imports
13
14 var GlobalArrayBuffer = global.ArrayBuffer;
15 var MaxSimple;
16 var MinSimple;
17 var SpeciesConstructor;
18
19 utils.Import(function(from) {
20 MaxSimple = from.MaxSimple;
21 MinSimple = from.MinSimple;
22 SpeciesConstructor = from.SpeciesConstructor;
23 });
24
25 // -------------------------------------------------------------------
26
27 // ES6 Draft 15.13.5.5.3
28 function ArrayBufferSlice(start, end) {
29 if (!IS_ARRAYBUFFER(this)) {
30 throw %make_type_error(kIncompatibleMethodReceiver,
31 'ArrayBuffer.prototype.slice', this);
32 }
33
34 var relativeStart = TO_INTEGER(start);
35 if (!IS_UNDEFINED(end)) {
36 end = TO_INTEGER(end);
37 }
38 var first;
39 var byte_length = %_ArrayBufferGetByteLength(this);
40 if (relativeStart < 0) {
41 first = MaxSimple(byte_length + relativeStart, 0);
42 } else {
43 first = MinSimple(relativeStart, byte_length);
44 }
45 var relativeEnd = IS_UNDEFINED(end) ? byte_length : end;
46 var fin;
47 if (relativeEnd < 0) {
48 fin = MaxSimple(byte_length + relativeEnd, 0);
49 } else {
50 fin = MinSimple(relativeEnd, byte_length);
51 }
52
53 if (fin < first) {
54 fin = first;
55 }
56 var newLen = fin - first;
57 var constructor = SpeciesConstructor(this, GlobalArrayBuffer, true);
58 var result = new constructor(newLen);
59 if (!IS_ARRAYBUFFER(result)) {
60 throw %make_type_error(kIncompatibleMethodReceiver,
61 'ArrayBuffer.prototype.slice', result);
62 }
63 // Checks for detached source/target ArrayBuffers are done inside of
64 // %ArrayBufferSliceImpl; the reordering of checks does not violate
65 // the spec because all exceptions thrown are TypeErrors.
66 if (result === this) {
67 throw %make_type_error(kArrayBufferSpeciesThis);
68 }
69 if (%_ArrayBufferGetByteLength(result) < newLen) {
70 throw %make_type_error(kArrayBufferTooShort);
71 }
72
73 %ArrayBufferSliceImpl(this, result, first, newLen);
74 return result;
75 }
76
77 utils.InstallFunctions(GlobalArrayBuffer.prototype, DONT_ENUM, [
78 "slice", ArrayBufferSlice
79 ]);
80
81 })
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