libgfortran/runtime/compile_options.c

   1 /* Handling of compile-time options that influence the library.
   2    Copyright (C) 2005-2015 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 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 #endif
 150
 151 /* Set the usual compile-time options.  */
 152 extern void set_options (int , int []);
 153 export_proto(set_options);
 154
 155 void
 156 set_options (int num, int options[])
 157 {
 158   if (num >= 1)
 159     compile_options.warn_std = options[0];
 160   if (num >= 2)
 161     compile_options.allow_std = options[1];
 162   if (num >= 3)
 163     compile_options.pedantic = options[2];
 164   /* options[3] is the removed -fdump-core option. It's place in the
 165      options array is retained due to ABI compatibility. Remove when
 166      bumping the library ABI.  */
 167   if (num >= 5)
 168     compile_options.backtrace = options[4];
 169   if (num >= 6)
 170     compile_options.sign_zero = options[5];
 171   if (num >= 7)
 172     compile_options.bounds_check = options[6];
 173   /* options[7] is the -frange-check option, which no longer affects
 174      the library behavior; range checking is now always done when
 175      parsing integers. It's place in the options array is retained due
 176      to ABI compatibility. Remove when bumping the library ABI.  */
 177   if (num >= 9)
 178     compile_options.fpe_summary = options[8];
 179
 180 #ifndef LIBGFOR_MINIMAL
 181   /* If backtrace is required, we set signal handlers on the POSIX
 182      2001 signals with core action.  */
 183   if (compile_options.backtrace)
 184     {
 185 #if defined(SIGQUIT)
 186       signal (SIGQUIT, backtrace_handler);
 187 #endif
 188
 189       /* The following 4 signals are defined by C89.  */
 190       signal (SIGILL, backtrace_handler);
 191       signal (SIGABRT, backtrace_handler);
 192       signal (SIGFPE, backtrace_handler);
 193       signal (SIGSEGV, backtrace_handler);
 194
 195 #if defined(SIGBUS)
 196       signal (SIGBUS, backtrace_handler);
 197 #endif
 198
 199 #if defined(SIGSYS)
 200       signal (SIGSYS, backtrace_handler);
 201 #endif
 202
 203 #if defined(SIGTRAP)
 204       signal (SIGTRAP, backtrace_handler);
 205 #endif
 206
 207 #if defined(SIGXCPU)
 208       signal (SIGXCPU, backtrace_handler);
 209 #endif
 210
 211 #if defined(SIGXFSZ)
 212       signal (SIGXFSZ, backtrace_handler);
 213 #endif
 214
 215       maybe_find_addr2line ();
 216     }
 217 #endif
 218 }
 219
 220
 221 /* Default values for the compile-time options.  Keep in sync with
 222    gcc/fortran/options.c (gfc_init_options).  */
 223 void
 224 init_compile_options (void)
 225 {
 226   compile_options.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
 227   compile_options.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 228     | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
 229     | GFC_STD_F2008_OBS | GFC_STD_GNU | GFC_STD_LEGACY;
 230   compile_options.pedantic = 0;
 231   compile_options.backtrace = 0;
 232   compile_options.sign_zero = 1;
 233   compile_options.fpe_summary = 0;
 234 }
 235
 236 /* Function called by the front-end to tell us the
 237    default for unformatted data conversion.  */
 238
 239 extern void set_convert (int);
 240 export_proto (set_convert);
 241
 242 void
 243 set_convert (int conv)
 244 {
 245   compile_options.convert = conv;
 246 }
 247
 248 extern void set_record_marker (int);
 249 export_proto (set_record_marker);
 250
 251
 252 void
 253 set_record_marker (int val)
 254 {
 255
 256   switch(val)
 257     {
 258     case 4:
 259       compile_options.record_marker = sizeof (GFC_INTEGER_4);
 260       break;
 261
 262     case 8:
 263       compile_options.record_marker = sizeof (GFC_INTEGER_8);
 264       break;
 265
 266     default:
 267       runtime_error ("Invalid value for record marker");
 268       break;
 269     }
 270 }
 271
 272 extern void set_max_subrecord_length (int);
 273 export_proto (set_max_subrecord_length);
 274
 275 void set_max_subrecord_length(int val)
 276 {
 277   if (val > GFC_MAX_SUBRECORD_LENGTH || val < 1)
 278     {
 279       runtime_error ("Invalid value for maximum subrecord length");
 280       return;
 281     }
 282
 283   compile_options.max_subrecord_length = val;
 284 }