1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
4 /* This Source Code Form is subject to the terms of the Mozilla Public
5 * License, v. 2.0. If a copy of the MPL was not distributed with this
6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
8 #if defined(XP_WIN) || defined(XP_OS2)
9 # define MOZALLOC_EXPORT __declspec(dllexport)
12 #include "mozilla/mozalloc_abort.h"
13 #include "mozilla/mozalloc_oom.h"
14 #include "mozilla/Assertions.h"
16 static mozalloc_oom_abort_handler gAbortHandler
;
18 #define OOM_MSG_LEADER "out of memory: 0x"
19 #define OOM_MSG_DIGITS "0000000000000000" // large enough for 2^64
20 #define OOM_MSG_TRAILER " bytes requested"
21 #define OOM_MSG_FIRST_DIGIT_OFFSET sizeof(OOM_MSG_LEADER) - 1
22 #define OOM_MSG_LAST_DIGIT_OFFSET sizeof(OOM_MSG_LEADER) + \
23 sizeof(OOM_MSG_DIGITS) - 3
25 static const char *hex
= "0123456789ABCDEF";
28 mozalloc_handle_oom(size_t size
)
30 char oomMsg
[] = OOM_MSG_LEADER OOM_MSG_DIGITS OOM_MSG_TRAILER
;
33 // NB: this is handle_oom() stage 1, which simply aborts on OOM.
34 // we might proceed to a stage 2 in which an attempt is made to
40 static_assert(OOM_MSG_FIRST_DIGIT_OFFSET
> 0,
41 "Loop below will never terminate (i can't go below 0)");
43 // Insert size into the diagnostic message using only primitive operations
44 for (i
= OOM_MSG_LAST_DIGIT_OFFSET
;
45 size
&& i
>= OOM_MSG_FIRST_DIGIT_OFFSET
; i
--) {
46 oomMsg
[i
] = hex
[size
% 16];
50 mozalloc_abort(oomMsg
);
54 mozalloc_set_oom_abort_handler(mozalloc_oom_abort_handler handler
)
56 gAbortHandler
= handler
;