1  //===------------------------- abort_message.cpp --------------------------===//
 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 <stdlib.h>
10  #include <stdio.h>
11  #include <stdarg.h>
12  #include "abort_message.h"
13  
14  #ifdef __BIONIC__
15  #   include <android/api-level.h>
16  #   if __ANDROID_API__ >= 21
17  #       include <syslog.h>
18          extern "C" void android_set_abort_message(const char* msg);
19  #   else
20  #       include <assert.h>
21  #   endif // __ANDROID_API__ >= 21
22  #endif // __BIONIC__
23  
24  #if defined(__APPLE__) && __has_include(<CrashReporterClient.h>)
25  #   include <CrashReporterClient.h>
26  #   define _LIBCXXABI_USE_CRASHREPORTER_CLIENT
27  #endif
28  
29  void abort_message(const char* format, ...)
30  {
31      // Write message to stderr. We do this before formatting into a
32      // variable-size buffer so that we still get some information if
33      // formatting into the variable-sized buffer fails.
34  #if !defined(NDEBUG) || !defined(LIBCXXABI_BAREMETAL)
35      {
36          fprintf(stderr, "libc++abi: ");
37          va_list list;
38          va_start(list, format);
39          vfprintf(stderr, format, list);
40          va_end(list);
41          fprintf(stderr, "\n");
42      }
43  #endif
44  
45      // Format the arguments into an allocated buffer. We leak the buffer on
46      // purpose, since we're about to abort() anyway.
47  #if defined(_LIBCXXABI_USE_CRASHREPORTER_CLIENT)
48      char* buffer;
49      va_list list;
50      va_start(list, format);
51      vasprintf(&buffer, format, list);
52      va_end(list);
53  
54      CRSetCrashLogMessage(buffer);
55  #elif defined(__BIONIC__)
56      char* buffer;
57      va_list list;
58      va_start(list, format);
59      vasprintf(&buffer, format, list);
60      va_end(list);
61  
62  #   if __ANDROID_API__ >= 21
63      // Show error in tombstone.
64      android_set_abort_message(buffer);
65  
66      // Show error in logcat.
67      openlog("libc++abi", 0, 0);
68      syslog(LOG_CRIT, "%s", buffer);
69      closelog();
70  #   else
71      // The good error reporting wasn't available in Android until L. Since we're
72      // about to abort anyway, just call __assert2, which will log _somewhere_
73      // (tombstone and/or logcat) in older releases.
74      __assert2(__FILE__, __LINE__, __func__, buffer);
75  #   endif // __ANDROID_API__ >= 21
76  #endif // __BIONIC__
77  
78      abort();
79  }