gecko-dev/mfbt/Assertions.cpp
Mike Hommey 08f7e29c6a Bug 1496503 - Use MOZ_CrashOOL in MOZ_CrashPrintf. r=froydnj
Because we don't really need all this repetition.

Depends on D11718

Depends on D11718

Differential Revision: https://phabricator.services.mozilla.com/D11719

--HG--
extra : moz-landing-system : lando
2018-11-14 22:35:25 +00:00

57 lines
2.1 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/Assertions.h"
#include "mozilla/Atomics.h"
#include <stdarg.h>
MOZ_BEGIN_EXTERN_C
/*
* The crash reason is defined as a global variable here rather than in the
* crash reporter itself to make it available to all code, even libraries like
* JS that don't link with the crash reporter directly. This value will only
* be consumed if the crash reporter is used by the target application.
*/
MFBT_DATA const char* gMozCrashReason = nullptr;
static char sPrintfCrashReason[sPrintfCrashReasonSize] = {};
// Accesses to this atomic are not included in web replay recordings, so that
// if we crash in an area where recorded events are not allowed the true reason
// for the crash is not obscured by a record/replay error.
static mozilla::Atomic<bool, mozilla::SequentiallyConsistent,
mozilla::recordreplay::Behavior::DontPreserve> sCrashing(false);
#ifndef DEBUG
MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE MOZ_FORMAT_PRINTF(2, 3) void
MOZ_CrashPrintf(int aLine, const char* aFormat, ...)
#else
MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE MOZ_FORMAT_PRINTF(3, 4) void
MOZ_CrashPrintf(const char* aFilename, int aLine, const char* aFormat, ...)
#endif
{
if (!sCrashing.compareExchange(false, true)) {
// In the unlikely event of a race condition, skip
// setting the crash reason and just crash safely.
MOZ_REALLY_CRASH(aLine);
}
va_list aArgs;
va_start(aArgs, aFormat);
int ret = vsnprintf(sPrintfCrashReason, sPrintfCrashReasonSize,
aFormat, aArgs);
va_end(aArgs);
MOZ_RELEASE_ASSERT(ret >= 0 && size_t(ret) < sPrintfCrashReasonSize,
"Could not write the explanation string to the supplied buffer!");
#ifdef DEBUG
MOZ_CrashOOL(aFilename, aLine, sPrintfCrashReason);
#else
MOZ_CrashOOL(nullptr, aLine, sPrintfCrashReason);
#endif
}
MOZ_END_EXTERN_C