libcxx/src/verbose_abort.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include <__config>
  10 #include <__verbose_abort>
  11 #include <cstdarg>
  12 #include <cstdio>
  13 #include <cstdlib>
  14
  15 #ifdef __BIONIC__
  16 #  include <android/api-level.h>
  17 #  if __ANDROID_API__ >= 21
  18 #    include <syslog.h>
  19 extern "C" void android_set_abort_message(const char* msg);
  20 #  else
  21 #    include <assert.h>
  22 #  endif // __ANDROID_API__ >= 21
  23 #endif   // __BIONIC__
  24
  25 #if defined(__APPLE__) && __has_include(<CrashReporterClient.h>)
  26 #  include <CrashReporterClient.h>
  27 #endif
  28
  29 _LIBCPP_BEGIN_NAMESPACE_STD
  30
  31 _LIBCPP_WEAK
  32 void __libcpp_verbose_abort(char const* format, ...) {
  33   // Write message to stderr. We do this before formatting into a
  34   // buffer so that we still get some information out if that fails.
  35   {
  36     va_list list;
  37     va_start(list, format);
  38     std::vfprintf(stderr, format, list);
  39     va_end(list);
  40   }
  41
  42   // Format the arguments into an allocated buffer for CrashReport & friends.
  43   // We leak the buffer on purpose, since we're about to abort() anyway.
  44   char* buffer; (void)buffer;
  45   va_list list;
  46   va_start(list, format);
  47
  48 #if defined(__APPLE__) && __has_include(<CrashReporterClient.h>)
  49   // Note that we should technically synchronize accesses here (by e.g. taking a lock),
  50   // however concretely we're only setting a pointer, so the likelihood of a race here
  51   // is low.
  52   vasprintf(&buffer, format, list);
  53   CRSetCrashLogMessage(buffer);
  54 #elif defined(__BIONIC__)
  55   vasprintf(&buffer, format, list);
  56
  57 #  if __ANDROID_API__ >= 21
  58   // Show error in tombstone.
  59   android_set_abort_message(buffer);
  60
  61   // Show error in logcat.
  62   openlog("libc++", 0, 0);
  63   syslog(LOG_CRIT, "%s", buffer);
  64   closelog();
  65 #  else
  66   // The good error reporting wasn't available in Android until L. Since we're
  67   // about to abort anyway, just call __assert2, which will log _somewhere_
  68   // (tombstone and/or logcat) in older releases.
  69   __assert2(__FILE__, __LINE__, __func__, buffer);
  70 #  endif // __ANDROID_API__ >= 21
  71 #endif
  72   va_end(list);
  73
  74   std::abort();
  75 }
  76
  77 _LIBCPP_END_NAMESPACE_STD