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54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: sw=4 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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static mozalloc_oom_abort_handler gAbortHandler;
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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 sizeof(OOM_MSG_LEADER) + \
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sizeof(OOM_MSG_DIGITS) - 3
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static const char *hex = "0123456789ABCDEF";
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void
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mozalloc_handle_oom(size_t size)
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{
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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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if (gAbortHandler)
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gAbortHandler(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;
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size && i >= OOM_MSG_FIRST_DIGIT_OFFSET; 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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void
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mozalloc_set_oom_abort_handler(mozalloc_oom_abort_handler handler)
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{
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gAbortHandler = handler;
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}
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