The Tor Browser / file comparison
comparison: memory/mozalloc/mozalloc_oom.cpp
memory/mozalloc/mozalloc_oom.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:a3eb40733ade |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: sw=4 ts=4 et : | |
| 3 */ | |
| 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/. */ | |
| 7 | |
| 8 #if defined(XP_WIN) | |
| 9 # define MOZALLOC_EXPORT __declspec(dllexport) | |
| 10 #endif | |
| 11 | |
| 12 #include "mozilla/mozalloc_abort.h" | |
| 13 #include "mozilla/mozalloc_oom.h" | |
| 14 #include "mozilla/Assertions.h" | |
| 15 | |
| 16 static mozalloc_oom_abort_handler gAbortHandler; | |
| 17 | |
| 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 | |
| 24 | |
| 25 static const char *hex = "0123456789ABCDEF"; | |
| 26 | |
| 27 void | |
| 28 mozalloc_handle_oom(size_t size) | |
| 29 { | |
| 30 char oomMsg[] = OOM_MSG_LEADER OOM_MSG_DIGITS OOM_MSG_TRAILER; | |
| 31 size_t i; | |
| 32 | |
| 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 | |
| 35 // reclaim memory | |
| 36 | |
| 37 if (gAbortHandler) | |
| 38 gAbortHandler(size); | |
| 39 | |
| 40 static_assert(OOM_MSG_FIRST_DIGIT_OFFSET > 0, | |
| 41 "Loop below will never terminate (i can't go below 0)"); | |
| 42 | |
| 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]; | |
| 47 size /= 16; | |
| 48 } | |
| 49 | |
| 50 mozalloc_abort(oomMsg); | |
| 51 } | |
| 52 | |
| 53 void | |
| 54 mozalloc_set_oom_abort_handler(mozalloc_oom_abort_handler handler) | |
| 55 { | |
| 56 gAbortHandler = handler; | |
| 57 } |
