Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
       4             :  * You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #include "mozilla/Assertions.h"
       7             : #include "mozilla/Atomics.h"
       8             : 
       9             : #include <stdarg.h>
      10             : 
      11             : MOZ_BEGIN_EXTERN_C
      12             : 
      13             : /*
      14             :  * The crash reason is defined as a global variable here rather than in the
      15             :  * crash reporter itself to make it available to all code, even libraries like
      16             :  * JS that don't link with the crash reporter directly. This value will only
      17             :  * be consumed if the crash reporter is used by the target application.
      18             :  */
      19             : MFBT_DATA const char* gMozCrashReason = nullptr;
      20             : 
      21             : #ifndef DEBUG
      22             : MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE void
      23             : MOZ_CrashOOL(int aLine, const char* aReason)
      24             : #else
      25             : MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE void
      26           0 : MOZ_CrashOOL(const char* aFilename, int aLine, const char* aReason)
      27             : #endif
      28             : {
      29             : #ifdef DEBUG
      30           0 :   MOZ_ReportCrash(aReason, aFilename, aLine);
      31             : #endif
      32           0 :   gMozCrashReason = aReason;
      33           0 :   MOZ_REALLY_CRASH(aLine);
      34             : }
      35             : 
      36             : static char sPrintfCrashReason[sPrintfCrashReasonSize] = {};
      37             : static mozilla::Atomic<bool> sCrashing(false);
      38             : 
      39             : #ifndef DEBUG
      40             : MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE MOZ_FORMAT_PRINTF(2, 3) void
      41             : MOZ_CrashPrintf(int aLine, const char* aFormat, ...)
      42             : #else
      43             : MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE MOZ_FORMAT_PRINTF(3, 4) void
      44           0 : MOZ_CrashPrintf(const char* aFilename, int aLine, const char* aFormat, ...)
      45             : #endif
      46             : {
      47           0 :   if (!sCrashing.compareExchange(false, true)) {
      48             :     // In the unlikely event of a race condition, skip
      49             :     // setting the crash reason and just crash safely.
      50           0 :     MOZ_REALLY_CRASH(aLine);
      51             :   }
      52             :   va_list aArgs;
      53           0 :   va_start(aArgs, aFormat);
      54             :   int ret = vsnprintf(sPrintfCrashReason, sPrintfCrashReasonSize,
      55           0 :                       aFormat, aArgs);
      56           0 :   va_end(aArgs);
      57           0 :   MOZ_RELEASE_ASSERT(ret >= 0 && size_t(ret) < sPrintfCrashReasonSize,
      58             :     "Could not write the explanation string to the supplied buffer!");
      59             : #ifdef DEBUG
      60           0 :   MOZ_ReportCrash(sPrintfCrashReason, aFilename, aLine);
      61             : #endif
      62           0 :   gMozCrashReason = sPrintfCrashReason;
      63           0 :   MOZ_REALLY_CRASH(aLine);
      64             : }
      65             : 
      66             : MOZ_END_EXTERN_C