From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- memory/mozalloc/mozalloc_oom.cpp | 53 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 memory/mozalloc/mozalloc_oom.cpp (limited to 'memory/mozalloc/mozalloc_oom.cpp') diff --git a/memory/mozalloc/mozalloc_oom.cpp b/memory/mozalloc/mozalloc_oom.cpp new file mode 100644 index 000000000..820888cdb --- /dev/null +++ b/memory/mozalloc/mozalloc_oom.cpp @@ -0,0 +1,53 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- + * vim: sw=4 ts=4 et : + */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/mozalloc_abort.h" +#include "mozilla/mozalloc_oom.h" +#include "mozilla/Assertions.h" + +static mozalloc_oom_abort_handler gAbortHandler; + +#define OOM_MSG_LEADER "out of memory: 0x" +#define OOM_MSG_DIGITS "0000000000000000" // large enough for 2^64 +#define OOM_MSG_TRAILER " bytes requested" +#define OOM_MSG_FIRST_DIGIT_OFFSET sizeof(OOM_MSG_LEADER) - 1 +#define OOM_MSG_LAST_DIGIT_OFFSET sizeof(OOM_MSG_LEADER) + \ + sizeof(OOM_MSG_DIGITS) - 3 + +static const char *hex = "0123456789ABCDEF"; + +void +mozalloc_handle_oom(size_t size) +{ + char oomMsg[] = OOM_MSG_LEADER OOM_MSG_DIGITS OOM_MSG_TRAILER; + size_t i; + + // NB: this is handle_oom() stage 1, which simply aborts on OOM. + // we might proceed to a stage 2 in which an attempt is made to + // reclaim memory + + if (gAbortHandler) + gAbortHandler(size); + + static_assert(OOM_MSG_FIRST_DIGIT_OFFSET > 0, + "Loop below will never terminate (i can't go below 0)"); + + // Insert size into the diagnostic message using only primitive operations + for (i = OOM_MSG_LAST_DIGIT_OFFSET; + size && i >= OOM_MSG_FIRST_DIGIT_OFFSET; i--) { + oomMsg[i] = hex[size % 16]; + size /= 16; + } + + mozalloc_abort(oomMsg); +} + +void +mozalloc_set_oom_abort_handler(mozalloc_oom_abort_handler handler) +{ + gAbortHandler = handler; +} -- cgit v1.2.3