gcc/collect-utils.c

   1 /* Utility functions used by tools like collect2 and lto-wrapper.
   2    Copyright (C) 2009-2020 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 notice (const char *cmsgid, ...)
  43 {
  44   va_list ap;
  45
  46   va_start (ap, cmsgid);
  47   vfprintf (stderr, _(cmsgid), ap);
  48   va_end (ap);
  49 }
  50
  51 void
  52 fatal_signal (int signum)
  53 {
  54   signal (signum, SIG_DFL);
  55   utils_cleanup (true);
  56   /* Get the same signal again, this time not handled,
  57      so its normal effect occurs.  */
  58   kill (getpid (), signum);
  59 }
  60 \f
  61 /* Wait for a process to finish, and exit if a nonzero status is found.  */
  62
  63 int
  64 collect_wait (const char *prog, struct pex_obj *pex)
  65 {
  66   int status;
  67
  68   if (!pex_get_status (pex, 1, &status))
  69     fatal_error (input_location, "cannot get program status: %m");
  70   pex_free (pex);
  71
  72   if (response_file && !save_temps)
  73     {
  74       unlink (response_file);
  75       response_file = NULL;
  76     }
  77
  78   if (status)
  79     {
  80       if (WIFSIGNALED (status))
  81         {
  82           int sig = WTERMSIG (status);
  83           fatal_error (input_location, "%s terminated with signal %d [%s]%s",
  84                        prog, sig, strsignal (sig),
  85                        WCOREDUMP (status) ? ", core dumped" : "");
  86         }
  87
  88       if (WIFEXITED (status))
  89         return WEXITSTATUS (status);
  90     }
  91   return 0;
  92 }
  93
  94 void
  95 do_wait (const char *prog, struct pex_obj *pex)
  96 {
  97   int ret = collect_wait (prog, pex);
  98   if (ret != 0)
  99     fatal_error (input_location, "%s returned %d exit status", prog, ret);
 100 }
 101
 102 \f
 103 /* Execute a program, and wait for the reply.  */
 104
 105 struct pex_obj *
 106 collect_execute (const char *prog, char **argv, const char *outname,
 107                  const char *errname, int flags, bool use_atfile)
 108 {
 109   struct pex_obj *pex;
 110   const char *errmsg;
 111   int err;
 112   char *response_arg = NULL;
 113   char *response_argv[3];
 114
 115   if (use_atfile && argv[0] != NULL)
 116     {
 117       /* If using @file arguments, create a temporary file and put the
 118          contents of argv into it.  Then change argv to an array corresponding
 119          to a single argument @FILE, where FILE is the temporary filename.  */
 120
 121       char **current_argv = argv + 1;
 122       char *argv0 = argv[0];
 123       int status;
 124       FILE *f;
 125
 126       /* Note: we assume argv contains at least one element; this is
 127          checked above.  */
 128
 129       response_file = make_temp_file ("");
 130
 131       f = fopen (response_file, "w");
 132
 133       if (f == NULL)
 134         fatal_error (input_location, "could not open response file %s",
 135                      response_file);
 136
 137       status = writeargv (current_argv, f);
 138
 139       if (status)
 140         fatal_error (input_location, "could not write to response file %s",
 141                      response_file);
 142
 143       status = fclose (f);
 144
 145       if (EOF == status)
 146         fatal_error (input_location, "could not close response file %s",
 147                      response_file);
 148
 149       response_arg = concat ("@", response_file, NULL);
 150       response_argv[0] = argv0;
 151       response_argv[1] = response_arg;
 152       response_argv[2] = NULL;
 153
 154       argv = response_argv;
 155     }
 156
 157   if (verbose || debug)
 158     {
 159       char **p_argv;
 160       const char *str;
 161
 162       if (argv[0])
 163         fprintf (stderr, "%s", argv[0]);
 164       else
 165         notice ("[cannot find %s]", prog);
 166
 167       for (p_argv = &argv[1]; (str = *p_argv) != (char *) 0; p_argv++)
 168         fprintf (stderr, " %s", str);
 169
 170       fprintf (stderr, "\n");
 171     }
 172
 173   fflush (stdout);
 174   fflush (stderr);
 175
 176   /* If we cannot find a program we need, complain error.  Do this here
 177      since we might not end up needing something that we could not find.  */
 178
 179   if (argv[0] == 0)
 180     fatal_error (input_location, "cannot find %qs", prog);
 181
 182   pex = pex_init (0, "collect2", NULL);
 183   if (pex == NULL)
 184     fatal_error (input_location, "%<pex_init%> failed: %m");
 185
 186   errmsg = pex_run (pex, flags, argv[0], argv, outname,
 187                     errname, &err);
 188   if (errmsg != NULL)
 189     {
 190       if (err != 0)
 191         {
 192           errno = err;
 193           fatal_error (input_location, "%s: %m", _(errmsg));
 194         }
 195       else
 196         fatal_error (input_location, errmsg);
 197     }
 198
 199   free (response_arg);
 200
 201   return pex;
 202 }
 203
 204 void
 205 fork_execute (const char *prog, char **argv, bool use_atfile)
 206 {
 207   struct pex_obj *pex;
 208
 209   pex = collect_execute (prog, argv, NULL, NULL,
 210                          PEX_LAST | PEX_SEARCH, use_atfile);
 211   do_wait (prog, pex);
 212 }
 213
 214 /* Delete tempfiles.  */
 215
 216 void
 217 utils_cleanup (bool from_signal)
 218 {
 219   static bool cleanup_done = false;
 220
 221   if (cleanup_done)
 222     return;
 223
 224   /* Setting cleanup_done prevents an infinite loop if one of the
 225      calls to maybe_unlink fails. */
 226   cleanup_done = true;
 227
 228   tool_cleanup (from_signal);
 229 }