Line data Source code
1 : /* Utility functions used by tools like collect2 and lto-wrapper.
2 : Copyright (C) 2009-2026 Free Software Foundation, Inc.
3 :
4 : This file is part of GCC.
5 :
6 : GCC is free software; you can redistribute it and/or modify it under
7 : the terms of the GNU General Public License as published by the Free
8 : Software Foundation; either version 3, or (at your option) any later
9 : version.
10 :
11 : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 : WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 : FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 : for more details.
15 :
16 : You should have received a copy of the GNU General Public License
17 : along with GCC; see the file COPYING3. If not see
18 : <http://www.gnu.org/licenses/>. */
19 :
20 : #include "config.h"
21 : #include "system.h"
22 : #include "coretypes.h"
23 : #include "intl.h"
24 : #include "diagnostic.h"
25 : #include "obstack.h"
26 : #include "opts.h"
27 : #include "options.h"
28 : #include "simple-object.h"
29 : #include "lto-section-names.h"
30 : #include "collect-utils.h"
31 :
32 : static char *response_file;
33 :
34 : bool debug;
35 : bool verbose;
36 : bool save_temps;
37 : const char *dumppfx;
38 :
39 :
40 : /* Notify user of a non-error. */
41 : void
42 0 : notice (const char *cmsgid, ...)
43 : {
44 0 : va_list ap;
45 :
46 0 : va_start (ap, cmsgid);
47 0 : vfprintf (stderr, _(cmsgid), ap);
48 0 : va_end (ap);
49 0 : }
50 :
51 : void
52 0 : fatal_signal (int signum)
53 : {
54 0 : signal (signum, SIG_DFL);
55 0 : utils_cleanup (true);
56 : /* Get the same signal again, this time not handled,
57 : so its normal effect occurs. */
58 0 : kill (getpid (), signum);
59 0 : }
60 :
61 : /* Setup the signal handlers for the utils. */
62 : void
63 110671 : setup_signals (void)
64 : {
65 : #ifdef SIGQUIT
66 110671 : if (signal (SIGQUIT, SIG_IGN) != SIG_IGN)
67 110671 : signal (SIGQUIT, fatal_signal);
68 : #endif
69 110671 : if (signal (SIGINT, SIG_IGN) != SIG_IGN)
70 110666 : signal (SIGINT, fatal_signal);
71 : #ifdef SIGALRM
72 110671 : if (signal (SIGALRM, SIG_IGN) != SIG_IGN)
73 110671 : signal (SIGALRM, fatal_signal);
74 : #endif
75 : #ifdef SIGHUP
76 110671 : if (signal (SIGHUP, SIG_IGN) != SIG_IGN)
77 2421 : signal (SIGHUP, fatal_signal);
78 : #endif
79 110671 : if (signal (SIGSEGV, SIG_IGN) != SIG_IGN)
80 110671 : signal (SIGSEGV, fatal_signal);
81 110671 : if (signal (SIGTERM, SIG_IGN) != SIG_IGN)
82 110671 : signal (SIGTERM, fatal_signal);
83 : #ifdef SIGPIPE
84 110671 : if (signal (SIGPIPE, SIG_IGN) != SIG_IGN)
85 110671 : signal (SIGPIPE, fatal_signal);
86 : #endif
87 : #ifdef SIGBUS
88 110671 : if (signal (SIGBUS, SIG_IGN) != SIG_IGN)
89 110671 : signal (SIGBUS, fatal_signal);
90 : #endif
91 : #ifdef SIGCHLD
92 : /* We *MUST* set SIGCHLD to SIG_DFL so that the wait4() call will
93 : receive the signal. A different setting is inheritable */
94 110671 : signal (SIGCHLD, SIG_DFL);
95 : #endif
96 110671 : }
97 :
98 : /* Wait for a process to finish, and exit if a nonzero status is found. */
99 :
100 : int
101 128713 : collect_wait (const char *prog, struct pex_obj *pex)
102 : {
103 128713 : int status;
104 :
105 128713 : if (!pex_get_status (pex, 1, &status))
106 0 : fatal_error (input_location, "cannot get program status: %m");
107 128713 : pex_free (pex);
108 :
109 128713 : if (response_file && !save_temps)
110 : {
111 13718 : unlink (response_file);
112 13718 : response_file = NULL;
113 : }
114 :
115 128713 : if (status)
116 : {
117 132 : if (WIFSIGNALED (status))
118 : {
119 0 : int sig = WTERMSIG (status);
120 0 : fatal_error (input_location, "%s terminated with signal %d [%s]%s",
121 : prog, sig, strsignal (sig),
122 0 : WCOREDUMP (status) ? ", core dumped" : "");
123 : }
124 :
125 132 : if (WIFEXITED (status))
126 132 : return WEXITSTATUS (status);
127 : }
128 : return 0;
129 : }
130 :
131 : void
132 31709 : do_wait (const char *prog, struct pex_obj *pex)
133 : {
134 31709 : int ret = collect_wait (prog, pex);
135 31709 : if (ret != 0)
136 0 : fatal_error (input_location, "%s returned %d exit status", prog, ret);
137 31709 : }
138 :
139 :
140 : /* Execute a program, and wait for the reply. */
141 :
142 : struct pex_obj *
143 128713 : collect_execute (const char *prog, char **argv, const char *outname,
144 : const char *errname, int flags, bool use_atfile,
145 : const char *atsuffix)
146 : {
147 128713 : struct pex_obj *pex;
148 128713 : const char *errmsg;
149 128713 : int err;
150 128713 : char *response_arg = NULL;
151 128713 : char *response_argv[3];
152 :
153 128713 : if (use_atfile && argv[0] != NULL)
154 : {
155 : /* If using @file arguments, create a temporary file and put the
156 : contents of argv into it. Then change argv to an array corresponding
157 : to a single argument @FILE, where FILE is the temporary filename. */
158 :
159 13753 : char **current_argv = argv + 1;
160 13753 : char *argv0 = argv[0];
161 13753 : int status;
162 13753 : FILE *f;
163 :
164 : /* Note: we assume argv contains at least one element; this is
165 : checked above. */
166 :
167 13753 : if (!save_temps || !atsuffix || !dumppfx)
168 13718 : response_file = make_temp_file ("");
169 : else
170 35 : response_file = concat (dumppfx, atsuffix, NULL);
171 :
172 13753 : f = fopen (response_file, "w");
173 :
174 13753 : if (f == NULL)
175 0 : fatal_error (input_location, "could not open response file %s",
176 : response_file);
177 :
178 13753 : status = writeargv (current_argv, f);
179 :
180 13753 : if (status)
181 0 : fatal_error (input_location, "could not write to response file %s",
182 : response_file);
183 :
184 13753 : status = fclose (f);
185 :
186 13753 : if (EOF == status)
187 0 : fatal_error (input_location, "could not close response file %s",
188 : response_file);
189 :
190 13753 : response_arg = concat ("@", response_file, NULL);
191 13753 : response_argv[0] = argv0;
192 13753 : response_argv[1] = response_arg;
193 13753 : response_argv[2] = NULL;
194 :
195 13753 : argv = response_argv;
196 : }
197 :
198 128713 : if (verbose || debug)
199 : {
200 0 : char **p_argv;
201 0 : const char *str;
202 :
203 0 : if (argv[0])
204 0 : fprintf (stderr, "%s", argv[0]);
205 : else
206 0 : notice ("[cannot find %s]", prog);
207 :
208 0 : for (p_argv = &argv[1]; (str = *p_argv) != (char *) 0; p_argv++)
209 0 : fprintf (stderr, " %s", str);
210 :
211 0 : fprintf (stderr, "\n");
212 : }
213 :
214 128713 : fflush (stdout);
215 128713 : fflush (stderr);
216 :
217 : /* If we cannot find a program we need, complain error. Do this here
218 : since we might not end up needing something that we could not find. */
219 :
220 128713 : if (argv[0] == 0)
221 0 : fatal_error (input_location, "cannot find %qs", prog);
222 :
223 128713 : pex = pex_init (0, "collect2", NULL);
224 128713 : if (pex == NULL)
225 : fatal_error (input_location, "%<pex_init%> failed: %m");
226 :
227 128713 : errmsg = pex_run (pex, flags, argv[0], argv, outname,
228 : errname, &err);
229 128713 : if (errmsg != NULL)
230 : {
231 0 : if (err != 0)
232 : {
233 0 : errno = err;
234 0 : fatal_error (input_location, "%s: %m", _(errmsg));
235 : }
236 : else
237 0 : fatal_error (input_location, errmsg);
238 : }
239 :
240 128713 : free (response_arg);
241 :
242 128713 : return pex;
243 : }
244 :
245 : void
246 18148 : fork_execute (const char *prog, char **argv, bool use_atfile,
247 : const char *atsuffix)
248 : {
249 18148 : struct pex_obj *pex;
250 :
251 18148 : pex = collect_execute (prog, argv, NULL, NULL,
252 : PEX_LAST | PEX_SEARCH, use_atfile, atsuffix);
253 18148 : do_wait (prog, pex);
254 18148 : }
255 :
256 : /* Delete tempfiles. */
257 :
258 : void
259 13667 : utils_cleanup (bool from_signal)
260 : {
261 13667 : static bool cleanup_done = false;
262 :
263 13667 : if (cleanup_done)
264 : return;
265 :
266 : /* Setting cleanup_done prevents an infinite loop if one of the
267 : calls to maybe_unlink fails. */
268 13667 : cleanup_done = true;
269 :
270 13667 : tool_cleanup (from_signal);
271 : }
272 :
273 : /* Return COLLECT_GCC_OPTIONS, expanding an @file reference if present.
274 : Returns nullptr if unset. Result is owned by an internal cache. */
275 :
276 : const char *
277 207675 : read_collect_gcc_options (void)
278 : {
279 207675 : static char *cached;
280 :
281 207675 : if (cached)
282 : return cached;
283 :
284 110671 : const char *raw = getenv ("COLLECT_GCC_OPTIONS");
285 110671 : if (raw == nullptr)
286 : return nullptr;
287 :
288 110671 : cached = expandargstr (tool_name, raw);
289 110671 : return cached;
290 : }
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