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53 lines
1.9 KiB
C++
53 lines
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=4 et :
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/mozalloc_abort.h"
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#include "mozilla/mozalloc_oom.h"
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#include "mozilla/Assertions.h"
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#define OOM_MSG_LEADER "out of memory: 0x"
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#define OOM_MSG_DIGITS "0000000000000000" // large enough for 2^64
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#define OOM_MSG_TRAILER " bytes requested"
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#define OOM_MSG_FIRST_DIGIT_OFFSET sizeof(OOM_MSG_LEADER) - 1
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#define OOM_MSG_LAST_DIGIT_OFFSET \
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sizeof(OOM_MSG_LEADER) + sizeof(OOM_MSG_DIGITS) - 3
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MFBT_DATA size_t gOOMAllocationSize = 0;
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static const char* hex = "0123456789ABCDEF";
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void mozalloc_handle_oom(size_t size) {
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char oomMsg[] = OOM_MSG_LEADER OOM_MSG_DIGITS OOM_MSG_TRAILER;
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size_t i;
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// NB: this is handle_oom() stage 1, which simply aborts on OOM.
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// we might proceed to a stage 2 in which an attempt is made to
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// reclaim memory
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// Warning: when stage 2 is done by, for example, notifying
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// "memory-pressure" synchronously, please audit all
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// nsExpirationTrackers and ensure that the actions they take
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// on memory-pressure notifications (via NotifyExpired) are safe.
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// Note that Document::SelectorCache::NotifyExpired is _known_
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// to not be safe: it will delete the selector it's caching,
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// which might be in use at the time under querySelector or
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// querySelectorAll.
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gOOMAllocationSize = size;
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static_assert(OOM_MSG_FIRST_DIGIT_OFFSET > 0,
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"Loop below will never terminate (i can't go below 0)");
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// Insert size into the diagnostic message using only primitive operations
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for (i = OOM_MSG_LAST_DIGIT_OFFSET; size && i >= OOM_MSG_FIRST_DIGIT_OFFSET;
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i--) {
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oomMsg[i] = hex[size % 16];
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size /= 16;
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}
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mozalloc_abort(oomMsg);
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}
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