libgfortran/runtime/compile_options.c

   1 /* Handling of compile-time options that influence the library.
   2    Copyright (C) 2005-2014 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
  33 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
  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
 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   backtrace ();
 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
 140
 141 /* Helper function for set_options because we need to access the
 142    global variable options which is not seen in set_options.  */
 143 static void
 144 maybe_find_addr2line (void)
 145 {
 146   if (options.backtrace == -1)
 147     find_addr2line ();
 148 }
 149
 150 /* Set the usual compile-time options.  */
 151 extern void set_options (int , int []);
 152 export_proto(set_options);
 153
 154 void
 155 set_options (int num, int options[])
 156 {
 157   if (num >= 1)
 158     compile_options.warn_std = options[0];
 159   if (num >= 2)
 160     compile_options.allow_std = options[1];
 161   if (num >= 3)
 162     compile_options.pedantic = options[2];
 163   /* options[3] is the removed -fdump-core option. It's place in the
 164      options array is retained due to ABI compatibility. Remove when
 165      bumping the library ABI.  */
 166   if (num >= 5)
 167     compile_options.backtrace = options[4];
 168   if (num >= 6)
 169     compile_options.sign_zero = options[5];
 170   if (num >= 7)
 171     compile_options.bounds_check = options[6];
 172   /* options[7] is the -frange-check option, which no longer affects
 173      the library behavior; range checking is now always done when
 174      parsing integers. It's place in the options array is retained due
 175      to ABI compatibility. Remove when bumping the library ABI.  */
 176   if (num >= 9)
 177     compile_options.fpe_summary = options[8];
 178
 179   /* If backtrace is required, we set signal handlers on the POSIX
 180      2001 signals with core action.  */
 181   if (compile_options.backtrace)
 182     {
 183 #if defined(SIGQUIT)
 184       signal (SIGQUIT, backtrace_handler);
 185 #endif
 186
 187       /* The following 4 signals are defined by C89.  */
 188       signal (SIGILL, backtrace_handler);
 189       signal (SIGABRT, backtrace_handler);
 190       signal (SIGFPE, backtrace_handler);
 191       signal (SIGSEGV, backtrace_handler);
 192
 193 #if defined(SIGBUS)
 194       signal (SIGBUS, backtrace_handler);
 195 #endif
 196
 197 #if defined(SIGSYS)
 198       signal (SIGSYS, backtrace_handler);
 199 #endif
 200
 201 #if defined(SIGTRAP)
 202       signal (SIGTRAP, backtrace_handler);
 203 #endif
 204
 205 #if defined(SIGXCPU)
 206       signal (SIGXCPU, backtrace_handler);
 207 #endif
 208
 209 #if defined(SIGXFSZ)
 210       signal (SIGXFSZ, backtrace_handler);
 211 #endif
 212
 213       maybe_find_addr2line ();
 214     }
 215 }
 216
 217
 218 /* Default values for the compile-time options.  Keep in sync with
 219    gcc/fortran/options.c (gfc_init_options).  */
 220 void
 221 init_compile_options (void)
 222 {
 223   compile_options.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
 224   compile_options.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 225     | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
 226     | GFC_STD_F2008_OBS | GFC_STD_GNU | GFC_STD_LEGACY;
 227   compile_options.pedantic = 0;
 228   compile_options.backtrace = 0;
 229   compile_options.sign_zero = 1;
 230   compile_options.fpe_summary = 0;
 231 }
 232
 233 /* Function called by the front-end to tell us the
 234    default for unformatted data conversion.  */
 235
 236 extern void set_convert (int);
 237 export_proto (set_convert);
 238
 239 void
 240 set_convert (int conv)
 241 {
 242   compile_options.convert = conv;
 243 }
 244
 245 extern void set_record_marker (int);
 246 export_proto (set_record_marker);
 247
 248
 249 void
 250 set_record_marker (int val)
 251 {
 252
 253   switch(val)
 254     {
 255     case 4:
 256       compile_options.record_marker = sizeof (GFC_INTEGER_4);
 257       break;
 258
 259     case 8:
 260       compile_options.record_marker = sizeof (GFC_INTEGER_8);
 261       break;
 262
 263     default:
 264       runtime_error ("Invalid value for record marker");
 265       break;
 266     }
 267 }
 268
 269 extern void set_max_subrecord_length (int);
 270 export_proto (set_max_subrecord_length);
 271
 272 void set_max_subrecord_length(int val)
 273 {
 274   if (val > GFC_MAX_SUBRECORD_LENGTH || val < 1)
 275     {
 276       runtime_error ("Invalid value for maximum subrecord length");
 277       return;
 278     }
 279
 280   compile_options.max_subrecord_length = val;
 281 }