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0f1c6a1f28
For some reason, our clang-plugin didn't notice this before clang 11. Differential Revision: https://phabricator.services.mozilla.com/D79901
47 lines
1.7 KiB
C++
47 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Assertions.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/Sprintf.h"
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#include <stdarg.h>
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MOZ_BEGIN_EXTERN_C
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/*
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* The crash reason is defined as a global variable here rather than in the
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* crash reporter itself to make it available to all code, even libraries like
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* JS that don't link with the crash reporter directly. This value will only
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* be consumed if the crash reporter is used by the target application.
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*/
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MFBT_DATA const char* gMozCrashReason = nullptr;
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static char sPrintfCrashReason[sPrintfCrashReasonSize] = {};
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// Accesses to this atomic are not included in web replay recordings, so that
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// if we crash in an area where recorded events are not allowed the true reason
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// for the crash is not obscured by a record/replay error.
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static mozilla::Atomic<bool, mozilla::SequentiallyConsistent> sCrashing(false);
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MFBT_API MOZ_COLD MOZ_NEVER_INLINE MOZ_FORMAT_PRINTF(1, 2) const
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char* MOZ_CrashPrintf(const char* aFormat, ...) {
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if (!sCrashing.compareExchange(false, true)) {
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// In the unlikely event of a race condition, skip
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// setting the crash reason and just crash safely.
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MOZ_RELEASE_ASSERT(false);
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}
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va_list aArgs;
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va_start(aArgs, aFormat);
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int ret = VsprintfLiteral(sPrintfCrashReason, aFormat, aArgs);
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va_end(aArgs);
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MOZ_RELEASE_ASSERT(
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ret >= 0 && size_t(ret) < sPrintfCrashReasonSize,
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"Could not write the explanation string to the supplied buffer!");
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return sPrintfCrashReason;
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}
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MOZ_END_EXTERN_C
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