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Diffstat (limited to 'mfbt/Assertions.cpp')
-rw-r--r-- | mfbt/Assertions.cpp | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/mfbt/Assertions.cpp b/mfbt/Assertions.cpp new file mode 100644 index 0000000000..62630842d6 --- /dev/null +++ b/mfbt/Assertions.cpp @@ -0,0 +1,66 @@ +/* -*- 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; + +#ifndef DEBUG +MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE void +MOZ_CrashOOL(int aLine, const char* aReason) +#else +MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE void +MOZ_CrashOOL(const char* aFilename, int aLine, const char* aReason) +#endif +{ +#ifdef DEBUG + MOZ_ReportCrash(aReason, aFilename, aLine); +#endif + MOZ_CRASH_ANNOTATE(aReason); + MOZ_REALLY_CRASH(aLine); +} + +static char sPrintfCrashReason[sPrintfCrashReasonSize] = {}; +static mozilla::Atomic<bool> 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_ReportCrash(sPrintfCrashReason, aFilename, aLine); +#endif + MOZ_CRASH_ANNOTATE(sPrintfCrashReason); + MOZ_REALLY_CRASH(aLine); +} + +MOZ_END_EXTERN_C |