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>
19extern "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 void __libcpp_verbose_abort(char const* format, ...) {
32 // Write message to stderr. We do this before formatting into a
33 // buffer so that we still get some information out if that fails.
34 {
35 va_list list;
36 va_start(list, format);
37 std::vfprintf(stderr, format: format, arg: list);
38 va_end(list);
39 }
40
41 // Format the arguments into an allocated buffer for CrashReport & friends.
42 // We leak the buffer on purpose, since we're about to abort() anyway.
43 char* buffer;
44 (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
78

source code of libcxx/src/verbose_abort.cpp