axmol/js/spidermonkey-win32/include/jsalloc.h

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2012-05-27 22:53:48 +08:00
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=99 ft=cpp:
*
* ***** 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 SpiderMonkey JavaScript 1.9 code, released
* July 16, 2009.
*
* The Initial Developer of the Original Code is
* the Mozilla Corporation.
*
* 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 jsalloc_h_
#define jsalloc_h_
#include "jspubtd.h"
#include "jsutil.h"
namespace js {
/*
* Allocation policies. These model the concept:
* - public copy constructor, assignment, destructor
* - void *malloc_(size_t)
* Responsible for OOM reporting on NULL return value.
* - void *realloc_(size_t)
* Responsible for OOM reporting on NULL return value.
* The *used* bytes of the previous buffer is passed in
* (rather than the old allocation size), in addition to
* the *new* allocation size requested.
* - void free_(void *)
* - reportAllocOverflow()
* Called on overflow before the container returns NULL.
*/
/* Policy for using system memory functions and doing no error reporting. */
class SystemAllocPolicy
{
public:
void *malloc_(size_t bytes) { return js_malloc(bytes); }
void *realloc_(void *p, size_t oldBytes, size_t bytes) { return js_realloc(p, bytes); }
void free_(void *p) { js_free(p); }
void reportAllocOverflow() const {}
};
/*
* Allocation policy that calls the system memory functions and reports errors
* to the context. Since the JSContext given on construction is stored for
* the lifetime of the container, this policy may only be used for containers
* whose lifetime is a shorter than the given JSContext.
*
* FIXME bug 647103 - rewrite this in terms of temporary allocation functions,
* not the system ones.
*/
class TempAllocPolicy
{
JSContext *const cx;
/*
* Non-inline helper to call JSRuntime::onOutOfMemory with minimal
* code bloat.
*/
JS_FRIEND_API(void *) onOutOfMemory(void *p, size_t nbytes);
public:
TempAllocPolicy(JSContext *cx) : cx(cx) {}
JSContext *context() const {
return cx;
}
void *malloc_(size_t bytes) {
void *p = js_malloc(bytes);
if (JS_UNLIKELY(!p))
p = onOutOfMemory(NULL, bytes);
return p;
}
void *realloc_(void *p, size_t oldBytes, size_t bytes) {
void *p2 = js_realloc(p, bytes);
if (JS_UNLIKELY(!p2))
p2 = onOutOfMemory(p2, bytes);
return p2;
}
void free_(void *p) {
js_free(p);
}
JS_FRIEND_API(void) reportAllocOverflow() const;
};
} /* namespace js */
#endif /* jsalloc_h_ */