1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : * vim: set ts=8 sw=4 et tw=99 ft=cpp:
3 : *
4 : * ***** BEGIN LICENSE BLOCK *****
5 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6 : *
7 : * The contents of this file are subject to the Mozilla Public License Version
8 : * 1.1 (the "License"); you may not use this file except in compliance with
9 : * the License. You may obtain a copy of the License at
10 : * http://www.mozilla.org/MPL/
11 : *
12 : * Software distributed under the License is distributed on an "AS IS" basis,
13 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14 : * for the specific language governing rights and limitations under the
15 : * License.
16 : *
17 : * The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
18 : * July 16, 2009.
19 : *
20 : * The Initial Developer of the Original Code is
21 : * the Mozilla Corporation.
22 : *
23 : * Contributor(s):
24 : *
25 : * Alternatively, the contents of this file may be used under the terms of
26 : * either of the GNU General Public License Version 2 or later (the "GPL"),
27 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 : * in which case the provisions of the GPL or the LGPL are applicable instead
29 : * of those above. If you wish to allow use of your version of this file only
30 : * under the terms of either the GPL or the LGPL, and not to allow others to
31 : * use your version of this file under the terms of the MPL, indicate your
32 : * decision by deleting the provisions above and replace them with the notice
33 : * and other provisions required by the GPL or the LGPL. If you do not delete
34 : * the provisions above, a recipient may use your version of this file under
35 : * the terms of any one of the MPL, the GPL or the LGPL.
36 : *
37 : * ***** END LICENSE BLOCK ***** */
38 :
39 : #ifndef jsalloc_h_
40 : #define jsalloc_h_
41 :
42 : #include "jspubtd.h"
43 : #include "jsutil.h"
44 :
45 : namespace js {
46 :
47 : /*
48 : * Allocation policies. These model the concept:
49 : * - public copy constructor, assignment, destructor
50 : * - void *malloc_(size_t)
51 : * Responsible for OOM reporting on NULL return value.
52 : * - void *realloc_(size_t)
53 : * Responsible for OOM reporting on NULL return value.
54 : * The *used* bytes of the previous buffer is passed in
55 : * (rather than the old allocation size), in addition to
56 : * the *new* allocation size requested.
57 : * - void free_(void *)
58 : * - reportAllocOverflow()
59 : * Called on overflow before the container returns NULL.
60 : */
61 :
62 : /* Policy for using system memory functions and doing no error reporting. */
63 : class SystemAllocPolicy
64 : {
65 : public:
66 1174827 : void *malloc_(size_t bytes) { return js_malloc(bytes); }
67 : void *realloc_(void *p, size_t oldBytes, size_t bytes) { return js_realloc(p, bytes); }
68 1174663 : void free_(void *p) { js_free(p); }
69 0 : void reportAllocOverflow() const {}
70 : };
71 :
72 : /*
73 : * Allocation policy that calls the system memory functions and reports errors
74 : * to the context. Since the JSContext given on construction is stored for
75 : * the lifetime of the container, this policy may only be used for containers
76 : * whose lifetime is a shorter than the given JSContext.
77 : *
78 : * FIXME bug 647103 - rewrite this in terms of temporary allocation functions,
79 : * not the system ones.
80 : */
81 : class TempAllocPolicy
82 : {
83 : JSContext *const cx;
84 :
85 : /*
86 : * Non-inline helper to call JSRuntime::onOutOfMemory with minimal
87 : * code bloat.
88 : */
89 : JS_FRIEND_API(void *) onOutOfMemory(void *p, size_t nbytes);
90 :
91 : public:
92 10683754 : TempAllocPolicy(JSContext *cx) : cx(cx) {}
93 :
94 : JSContext *context() const {
95 : return cx;
96 : }
97 :
98 2647172 : void *malloc_(size_t bytes) {
99 2647172 : void *p = js_malloc(bytes);
100 2647172 : if (JS_UNLIKELY(!p))
101 0 : p = onOutOfMemory(NULL, bytes);
102 2647172 : return p;
103 : }
104 :
105 : void *realloc_(void *p, size_t oldBytes, size_t bytes) {
106 : void *p2 = js_realloc(p, bytes);
107 : if (JS_UNLIKELY(!p2))
108 : p2 = onOutOfMemory(p2, bytes);
109 : return p2;
110 : }
111 :
112 2645332 : void free_(void *p) {
113 2645332 : js_free(p);
114 2645332 : }
115 :
116 : JS_FRIEND_API(void) reportAllocOverflow() const;
117 : };
118 :
119 : } /* namespace js */
120 :
121 : #endif /* jsalloc_h_ */
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