memory/mozalloc/mozalloc_oom.cpp@6474c204b198 (annotated)
memory/mozalloc/mozalloc_oom.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * vim: sw=4 ts=4 et : |
| michael@0 | 3 | */ |
| michael@0 | 4 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 5 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 6 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 7 | |
| michael@0 | 8 | #if defined(XP_WIN) |
| michael@0 | 9 | # define MOZALLOC_EXPORT __declspec(dllexport) |
| michael@0 | 10 | #endif |
| michael@0 | 11 | |
| michael@0 | 12 | #include "mozilla/mozalloc_abort.h" |
| michael@0 | 13 | #include "mozilla/mozalloc_oom.h" |
| michael@0 | 14 | #include "mozilla/Assertions.h" |
| michael@0 | 15 | |
| michael@0 | 16 | static mozalloc_oom_abort_handler gAbortHandler; |
| michael@0 | 17 | |
| michael@0 | 18 | #define OOM_MSG_LEADER "out of memory: 0x" |
| michael@0 | 19 | #define OOM_MSG_DIGITS "0000000000000000" // large enough for 2^64 |
| michael@0 | 20 | #define OOM_MSG_TRAILER " bytes requested" |
| michael@0 | 21 | #define OOM_MSG_FIRST_DIGIT_OFFSET sizeof(OOM_MSG_LEADER) - 1 |
| michael@0 | 22 | #define OOM_MSG_LAST_DIGIT_OFFSET sizeof(OOM_MSG_LEADER) + \ |
| michael@0 | 23 | sizeof(OOM_MSG_DIGITS) - 3 |
| michael@0 | 24 | |
| michael@0 | 25 | static const char *hex = "0123456789ABCDEF"; |
| michael@0 | 26 | |
| michael@0 | 27 | void |
| michael@0 | 28 | mozalloc_handle_oom(size_t size) |
| michael@0 | 29 | { |
| michael@0 | 30 | char oomMsg[] = OOM_MSG_LEADER OOM_MSG_DIGITS OOM_MSG_TRAILER; |
| michael@0 | 31 | size_t i; |
| michael@0 | 32 | |
| michael@0 | 33 | // NB: this is handle_oom() stage 1, which simply aborts on OOM. |
| michael@0 | 34 | // we might proceed to a stage 2 in which an attempt is made to |
| michael@0 | 35 | // reclaim memory |
| michael@0 | 36 | |
| michael@0 | 37 | if (gAbortHandler) |
| michael@0 | 38 | gAbortHandler(size); |
| michael@0 | 39 | |
| michael@0 | 40 | static_assert(OOM_MSG_FIRST_DIGIT_OFFSET > 0, |
| michael@0 | 41 | "Loop below will never terminate (i can't go below 0)"); |
| michael@0 | 42 | |
| michael@0 | 43 | // Insert size into the diagnostic message using only primitive operations |
| michael@0 | 44 | for (i = OOM_MSG_LAST_DIGIT_OFFSET; |
| michael@0 | 45 | size && i >= OOM_MSG_FIRST_DIGIT_OFFSET; i--) { |
| michael@0 | 46 | oomMsg[i] = hex[size % 16]; |
| michael@0 | 47 | size /= 16; |
| michael@0 | 48 | } |
| michael@0 | 49 | |
| michael@0 | 50 | mozalloc_abort(oomMsg); |
| michael@0 | 51 | } |
| michael@0 | 52 | |
| michael@0 | 53 | void |
| michael@0 | 54 | mozalloc_set_oom_abort_handler(mozalloc_oom_abort_handler handler) |
| michael@0 | 55 | { |
| michael@0 | 56 | gAbortHandler = handler; |
| michael@0 | 57 | } |
