/
jsarrayinlines.h
123 lines (112 loc) · 4.19 KB
/
jsarrayinlines.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsarrayinlines_h___
#define jsarrayinlines_h___
#include "jsinferinlines.h"
#include "jsobjinlines.h"
inline void
JSObject::markDenseArrayNotPacked(JSContext *cx)
{
JS_ASSERT(isDenseArray());
MarkTypeObjectFlags(cx, this, js::types::OBJECT_FLAG_NON_PACKED_ARRAY);
}
inline void
JSObject::ensureDenseArrayInitializedLength(JSContext *cx, uint32_t index, uint32_t extra)
{
/*
* Ensure that the array's contents have been initialized up to index, and
* mark the elements through 'index + extra' as initialized in preparation
* for a write.
*/
JS_ASSERT(index + extra <= getDenseArrayCapacity());
uint32_t &initlen = getElementsHeader()->initializedLength;
if (initlen < index)
markDenseArrayNotPacked(cx);
if (initlen < index + extra) {
JSCompartment *comp = compartment();
size_t offset = initlen;
for (js::HeapSlot *sp = elements + initlen;
sp != elements + (index + extra);
sp++, offset++)
sp->init(comp, this, offset, js::MagicValue(JS_ARRAY_HOLE));
initlen = index + extra;
}
}
inline JSObject::EnsureDenseResult
JSObject::ensureDenseArrayElements(JSContext *cx, unsigned index, unsigned extra)
{
JS_ASSERT(isDenseArray());
unsigned currentCapacity = getDenseArrayCapacity();
unsigned requiredCapacity;
if (extra == 1) {
/* Optimize for the common case. */
if (index < currentCapacity) {
ensureDenseArrayInitializedLength(cx, index, 1);
return ED_OK;
}
requiredCapacity = index + 1;
if (requiredCapacity == 0) {
/* Overflow. */
return ED_SPARSE;
}
} else {
requiredCapacity = index + extra;
if (requiredCapacity < index) {
/* Overflow. */
return ED_SPARSE;
}
if (requiredCapacity <= currentCapacity) {
ensureDenseArrayInitializedLength(cx, index, extra);
return ED_OK;
}
}
/*
* We use the extra argument also as a hint about number of non-hole
* elements to be inserted.
*/
if (requiredCapacity > MIN_SPARSE_INDEX &&
willBeSparseDenseArray(requiredCapacity, extra)) {
return ED_SPARSE;
}
if (!growElements(cx, requiredCapacity))
return ED_FAILED;
ensureDenseArrayInitializedLength(cx, index, extra);
return ED_OK;
}
#endif /* jsarrayinlines_h___ */