1 /* Handling of compile-time options that influence the library.
2 Copyright (C) 2005-2022 Free Software Foundation, Inc.
3
4 This file is part of the GNU Fortran runtime library (libgfortran).
5
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)
9 any later version.
10
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.
15
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.
19
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/>. */
24
25 #include "libgfortran.h"
26 #include <signal.h>
27
28
29 /* Useful compile-time options will be stored in here. */
30 compile_options_t compile_options;
31
32 #ifndef LIBGFOR_MINIMAL
33 static volatile sig_atomic_t fatal_error_in_progress = 0;
34
35
36 /* Helper function for backtrace_handler to write information about the
37 received signal to stderr before actually giving the backtrace. */
38 static void
show_signal(int signum)39 show_signal (int signum)
40 {
41 const char * name = NULL, * desc = NULL;
42
43 switch (signum)
44 {
45 #if defined(SIGQUIT)
46 case SIGQUIT:
47 name = "SIGQUIT";
48 desc = "Terminal quit signal";
49 break;
50 #endif
51
52 /* The following 4 signals are defined by C89. */
53 case SIGILL:
54 name = "SIGILL";
55 desc = "Illegal instruction";
56 break;
57
58 case SIGABRT:
59 name = "SIGABRT";
60 desc = "Process abort signal";
61 break;
62
63 case SIGFPE:
64 name = "SIGFPE";
65 desc = "Floating-point exception - erroneous arithmetic operation";
66 break;
67
68 case SIGSEGV:
69 name = "SIGSEGV";
70 desc = "Segmentation fault - invalid memory reference";
71 break;
72
73 #if defined(SIGBUS)
74 case SIGBUS:
75 name = "SIGBUS";
76 desc = "Access to an undefined portion of a memory object";
77 break;
78 #endif
79
80 #if defined(SIGSYS)
81 case SIGSYS:
82 name = "SIGSYS";
83 desc = "Bad system call";
84 break;
85 #endif
86
87 #if defined(SIGTRAP)
88 case SIGTRAP:
89 name = "SIGTRAP";
90 desc = "Trace/breakpoint trap";
91 break;
92 #endif
93
94 #if defined(SIGXCPU)
95 case SIGXCPU:
96 name = "SIGXCPU";
97 desc = "CPU time limit exceeded";
98 break;
99 #endif
100
101 #if defined(SIGXFSZ)
102 case SIGXFSZ:
103 name = "SIGXFSZ";
104 desc = "File size limit exceeded";
105 break;
106 #endif
107 }
108
109 if (name)
110 st_printf ("\nProgram received signal %s: %s.\n", name, desc);
111 else
112 st_printf ("\nProgram received signal %d.\n", signum);
113 }
114
115
116 /* A signal handler to allow us to output a backtrace. */
117 void
backtrace_handler(int signum)118 backtrace_handler (int signum)
119 {
120 /* Since this handler is established for more than one kind of signal,
121 it might still get invoked recursively by delivery of some other kind
122 of signal. Use a static variable to keep track of that. */
123 if (fatal_error_in_progress)
124 raise (signum);
125 fatal_error_in_progress = 1;
126
127 show_signal (signum);
128 estr_write ("\nBacktrace for this error:\n");
129 show_backtrace (true);
130
131 /* Now reraise the signal. We reactivate the signal's
132 default handling, which is to terminate the process.
133 We could just call exit or abort,
134 but reraising the signal sets the return status
135 from the process correctly. */
136 signal (signum, SIG_DFL);
137 raise (signum);
138 }
139 #endif
140
141 /* Set the usual compile-time options. */
142 extern void set_options (int , int []);
143 export_proto(set_options);
144
145 void
set_options(int num,int options[])146 set_options (int num, int options[])
147 {
148 if (num >= 1)
149 compile_options.warn_std = options[0];
150 if (num >= 2)
151 compile_options.allow_std = options[1];
152 if (num >= 3)
153 compile_options.pedantic = options[2];
154 if (num >= 4)
155 compile_options.backtrace = options[3];
156 if (num >= 5)
157 compile_options.sign_zero = options[4];
158 if (num >= 6)
159 compile_options.bounds_check = options[5];
160 if (num >= 7)
161 compile_options.fpe_summary = options[6];
162
163 #ifndef LIBGFOR_MINIMAL
164 /* If backtrace is required, we set signal handlers on the POSIX
165 2001 signals with core action. */
166 if (compile_options.backtrace)
167 {
168 #if defined(SIGQUIT)
169 signal (SIGQUIT, backtrace_handler);
170 #endif
171
172 /* The following 4 signals are defined by C89. */
173 signal (SIGILL, backtrace_handler);
174 signal (SIGABRT, backtrace_handler);
175 signal (SIGFPE, backtrace_handler);
176 signal (SIGSEGV, backtrace_handler);
177
178 #if defined(SIGBUS)
179 signal (SIGBUS, backtrace_handler);
180 #endif
181
182 #if defined(SIGSYS)
183 signal (SIGSYS, backtrace_handler);
184 #endif
185
186 #if defined(SIGTRAP)
187 signal (SIGTRAP, backtrace_handler);
188 #endif
189
190 #if defined(SIGXCPU)
191 signal (SIGXCPU, backtrace_handler);
192 #endif
193
194 #if defined(SIGXFSZ)
195 signal (SIGXFSZ, backtrace_handler);
196 #endif
197 }
198 #endif
199 }
200
201
202 /* Default values for the compile-time options. Keep in sync with
203 gcc/fortran/options.c (gfc_init_options). */
204 void
init_compile_options(void)205 init_compile_options (void)
206 {
207 compile_options.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
208 compile_options.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
209 | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
210 | GFC_STD_F2008_OBS | GFC_STD_GNU | GFC_STD_LEGACY;
211 compile_options.pedantic = 0;
212 compile_options.backtrace = 0;
213 compile_options.sign_zero = 1;
214 compile_options.fpe_summary = 0;
215 }
216
217 /* Function called by the front-end to tell us the
218 default for unformatted data conversion. */
219
220 extern void set_convert (int);
221 export_proto (set_convert);
222
223 void
set_convert(int conv)224 set_convert (int conv)
225 {
226 compile_options.convert = conv;
227 }
228
229 extern void set_record_marker (int);
230 export_proto (set_record_marker);
231
232
233 void
set_record_marker(int val)234 set_record_marker (int val)
235 {
236
237 switch(val)
238 {
239 case 4:
240 compile_options.record_marker = sizeof (GFC_INTEGER_4);
241 break;
242
243 case 8:
244 compile_options.record_marker = sizeof (GFC_INTEGER_8);
245 break;
246
247 default:
248 runtime_error ("Invalid value for record marker");
249 break;
250 }
251 }
252
253 extern void set_max_subrecord_length (int);
254 export_proto (set_max_subrecord_length);
255
set_max_subrecord_length(int val)256 void set_max_subrecord_length(int val)
257 {
258 if (val > GFC_MAX_SUBRECORD_LENGTH || val < 1)
259 {
260 runtime_error ("Invalid value for maximum subrecord length");
261 return;
262 }
263
264 compile_options.max_subrecord_length = val;
265 }
266