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gcc.gnu.org Git - gcc.git/blob - libgfortran/runtime/backtrace.c
1 /* Copyright (C) 2006-2024 Free Software Foundation, Inc.
2 Contributed by François-Xavier Coudert
4 This file is part of the GNU Fortran runtime library (libgfortran).
6 Libgfortran is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
11 Libgfortran is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
25 #include "libgfortran.h"
36 #include "backtrace-supported.h"
37 #include "backtrace.h"
40 /* Store our own state while backtracing. */
45 bool in_signal_handler
;
49 /* Does a function name have "_gfortran_" or "_gfortrani_" prefix, possibly
50 with additional underscore(s) at the beginning? Cannot use strncmp()
51 because we might be called from a signal handler. */
54 has_gfortran_prefix (const char *s
)
62 return (s
[0] == 'g' && s
[1] == 'f' && s
[2] == 'o' && s
[3] == 'r'
63 && s
[4] == 't' && s
[5] == 'r' && s
[6] == 'a' && s
[7] == 'n'
64 && (s
[8] == '_' || (s
[8] == 'i' && s
[9] == '_')));
68 error_callback (void *data
, const char *msg
, int errnum
)
70 struct mystate
*state
= (struct mystate
*) data
;
72 #define ERRHDR "\nCould not print backtrace: "
76 state
->try_simple
= true;
81 iov
[0].iov_base
= (char*) ERRHDR
;
82 iov
[0].iov_len
= strlen (ERRHDR
);
83 iov
[1].iov_base
= (char*) msg
;
84 iov
[1].iov_len
= strlen (msg
);
85 iov
[2].iov_base
= (char*) "\n";
92 if (state
->in_signal_handler
)
94 iov
[0].iov_base
= (char*) ERRHDR
;
95 iov
[0].iov_len
= strlen (ERRHDR
);
96 iov
[1].iov_base
= (char*) msg
;
97 iov
[1].iov_len
= strlen (msg
);
98 iov
[2].iov_base
= (char*) ", errno: ";
99 iov
[2].iov_len
= strlen (iov
[2].iov_base
);
100 /* Async-signal-safe function, errnum must be positive. */
101 const char *p
= gfc_itoa (errnum
, errbuf
, sizeof (errbuf
));
102 iov
[3].iov_base
= (char*) p
;
103 iov
[3].iov_len
= strlen (p
);
104 iov
[4].iov_base
= (char*) "\n";
106 estr_writev (iov
, 5);
109 st_printf (ERRHDR
"%s: %s\n", msg
,
110 gf_strerror (errnum
, errbuf
, sizeof (errbuf
)));
115 simple_callback (void *data
, uintptr_t pc
)
117 struct mystate
*state
= (struct mystate
*) data
;
118 st_printf ("#%d 0x%lx\n", state
->frame
, (unsigned long) pc
);
124 full_callback (void *data
, uintptr_t pc
, const char *filename
,
125 int lineno
, const char *function
)
127 struct mystate
*state
= (struct mystate
*) data
;
129 if (has_gfortran_prefix (function
))
132 st_printf ("#%d 0x%lx in %s\n", state
->frame
,
133 (unsigned long) pc
, function
== NULL
? "???" : function
);
134 if (filename
|| lineno
!= 0)
135 st_printf ("\tat %s:%d\n", filename
== NULL
? "???" : filename
, lineno
);
138 if (function
!= NULL
&& strcmp (function
, "main") == 0)
145 /* Display the backtrace. */
148 show_backtrace (bool in_signal_handler
)
150 /* Note that libbacktrace allows the state to be accessed from
151 multiple threads, so we don't need to use a TLS variable for the
153 static struct backtrace_state
*lbstate_saved
;
154 struct backtrace_state
*lbstate
;
155 struct mystate state
= { 0, false, in_signal_handler
};
157 lbstate
= __atomic_load_n (&lbstate_saved
, __ATOMIC_RELAXED
);
160 lbstate
= backtrace_create_state (NULL
, __gthread_active_p (),
161 error_callback
, NULL
);
163 __atomic_store_n (&lbstate_saved
, lbstate
, __ATOMIC_RELAXED
);
168 if (!BACKTRACE_SUPPORTED
|| (in_signal_handler
&& BACKTRACE_USES_MALLOC
))
170 /* If symbolic backtrace is not supported on this target, or would
171 require malloc() and we are in a signal handler, go with a
174 backtrace_simple (lbstate
, 0, simple_callback
, error_callback
, &state
);
178 /* libbacktrace uses mmap, which is safe to call from a signal handler
179 (in practice, if not in theory). Thus we can generate a symbolic
180 backtrace, if debug symbols are available. */
182 backtrace_full (lbstate
, 0, full_callback
, error_callback
, &state
);
183 if (state
.try_simple
)
184 backtrace_simple (lbstate
, 0, simple_callback
, error_callback
, &state
);
190 /* Function called by the front-end translating the BACKTRACE intrinsic. */
192 extern void backtrace (void);
193 export_proto (backtrace
);
198 show_backtrace (false);
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