/* -*- 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

  gMozCrashReason = aReason;

  MOZ_REALLY_CRASH(aLine);

}

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_ReportCrash(sPrintfCrashReason, aFilename, aLine);

#endif

  gMozCrashReason = sPrintfCrashReason;

  MOZ_REALLY_CRASH(aLine);

}

MOZ_END_EXTERN_C