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120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=99 ft=cpp:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
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* July 16, 2009.
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*
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* The Initial Developer of the Original Code is
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* the Mozilla Corporation.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef jsalloc_h_
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#define jsalloc_h_
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#include "jspubtd.h"
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#include "jsutil.h"
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#include "jsstaticcheck.h"
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namespace js {
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/*
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* Allocation policies. These model the concept:
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* - public copy constructor, assignment, destructor
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* - void *malloc_(size_t)
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* Responsible for OOM reporting on NULL return value.
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* - void *realloc_(size_t)
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* Responsible for OOM reporting on NULL return value.
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* - void free_(void *)
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* - reportAllocOverflow()
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* Called on overflow before the container returns NULL.
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*/
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/* Policy for using system memory functions and doing no error reporting. */
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class SystemAllocPolicy
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{
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public:
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void *malloc_(size_t bytes) { return js_malloc(bytes); }
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void *realloc_(void *p, size_t bytes) { return js_realloc(p, bytes); }
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void free_(void *p) { js_free(p); }
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void reportAllocOverflow() const {}
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};
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/*
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* Allocation policy that calls the system memory functions and reports errors
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* to the context. Since the JSContext given on construction is stored for
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* the lifetime of the container, this policy may only be used for containers
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* whose lifetime is a shorter than the given JSContext.
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*
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* FIXME bug 647103 - rewrite this in terms of temporary allocation functions,
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* not the system ones.
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*/
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class ContextAllocPolicy
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{
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JSContext *const cx;
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/*
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* Non-inline helper to call JSRuntime::onOutOfMemory with minimal
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* code bloat.
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*/
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JS_FRIEND_API(void *) onOutOfMemory(void *p, size_t nbytes);
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public:
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ContextAllocPolicy(JSContext *cx) : cx(cx) {}
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JSContext *context() const {
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return cx;
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}
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void *malloc_(size_t bytes) {
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void *p = js_malloc(bytes);
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if (JS_UNLIKELY(!p))
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p = onOutOfMemory(NULL, bytes);
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return p;
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}
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void *realloc_(void *p, size_t bytes) {
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void *p2 = js_realloc(p, bytes);
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if (JS_UNLIKELY(!p2))
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p2 = onOutOfMemory(p2, bytes);
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return p2;
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}
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void free_(void *p) {
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js_free(p);
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}
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JS_FRIEND_API(void) reportAllocOverflow() const;
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};
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} /* namespace js */
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#endif /* jsalloc_h_ */
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