libgfortran/runtime/compile_options.c

   1 /* Handling of compile-time options that influence the library.
   2    Copyright (C) 2005, 2007, 2009, 2010 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
  27 #ifdef HAVE_SIGNAL_H
  28 #include <signal.h>
  29 #endif
  30
  31
  32 /* Useful compile-time options will be stored in here.  */
  33 compile_options_t compile_options;
  34
  35
  36 volatile sig_atomic_t fatal_error_in_progress = 0;
  37
  38 /* A signal handler to allow us to output a backtrace.  */
  39 void
  40 backtrace_handler (int signum)
  41 {
  42   /* Since this handler is established for more than one kind of signal,
  43      it might still get invoked recursively by delivery of some other kind
  44      of signal.  Use a static variable to keep track of that. */
  45   if (fatal_error_in_progress)
  46     raise (signum);
  47   fatal_error_in_progress = 1;
  48
  49   show_backtrace();
  50
  51   /* Now reraise the signal.  We reactivate the signal's
  52      default handling, which is to terminate the process.
  53      We could just call exit or abort,
  54      but reraising the signal sets the return status
  55      from the process correctly. */
  56   signal (signum, SIG_DFL);
  57   raise (signum);
  58 }
  59
  60
  61 /* Set the usual compile-time options.  */
  62 extern void set_options (int , int []);
  63 export_proto(set_options);
  64
  65 void
  66 set_options (int num, int options[])
  67 {
  68   if (num >= 1)
  69     compile_options.warn_std = options[0];
  70   if (num >= 2)
  71     compile_options.allow_std = options[1];
  72   if (num >= 3)
  73     compile_options.pedantic = options[2];
  74   /* options[3] is the removed -fdump-core option. It's place in the
  75      options array is retained due to ABI compatibility. Remove when
  76      bumping the library ABI.  */
  77   if (num >= 5)
  78     compile_options.backtrace = options[4];
  79   if (num >= 6)
  80     compile_options.sign_zero = options[5];
  81   if (num >= 7)
  82     compile_options.bounds_check = options[6];
  83   if (num >= 8)
  84     compile_options.range_check = options[7];
  85
  86   /* If backtrace is required, we set signal handlers on the POSIX
  87      2001 signals with core action.  */
  88 #if defined(HAVE_SIGNAL) && (defined(SIGQUIT) || defined(SIGILL) \
  89                              || defined(SIGABRT) || defined(SIGFPE) \
  90                              || defined(SIGSEGV) || defined(SIGBUS) \
  91                              || defined(SIGSYS) || defined(SIGTRAP) \
  92                              || defined(SIGXCPU) || defined(SIGXFSZ))
  93   if (compile_options.backtrace)
  94     {
  95 #if defined(SIGQUIT)
  96       signal (SIGQUIT, backtrace_handler);
  97 #endif
  98
  99 #if defined(SIGILL)
 100       signal (SIGILL, backtrace_handler);
 101 #endif
 102
 103 #if defined(SIGABRT)
 104       signal (SIGABRT, backtrace_handler);
 105 #endif
 106
 107 #if defined(SIGFPE)
 108       signal (SIGFPE, backtrace_handler);
 109 #endif
 110
 111 #if defined(SIGSEGV)
 112       signal (SIGSEGV, backtrace_handler);
 113 #endif
 114
 115 #if defined(SIGBUS)
 116       signal (SIGBUS, backtrace_handler);
 117 #endif
 118
 119 #if defined(SIGSYS)
 120       signal (SIGSYS, backtrace_handler);
 121 #endif
 122
 123 #if defined(SIGTRAP)
 124       signal (SIGTRAP, backtrace_handler);
 125 #endif
 126
 127 #if defined(SIGXCPU)
 128       signal (SIGXCPU, backtrace_handler);
 129 #endif
 130
 131 #if defined(SIGXFSZ)
 132       signal (SIGXFSZ, backtrace_handler);
 133 #endif
 134     }
 135 #endif
 136
 137 }
 138
 139
 140 /* Default values for the compile-time options.  Keep in sync with
 141    gcc/fortran/options.c (gfc_init_options).  */
 142 void
 143 init_compile_options (void)
 144 {
 145   compile_options.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
 146   compile_options.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 147     | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
 148     | GFC_STD_F2008_OBS | GFC_STD_GNU | GFC_STD_LEGACY;
 149   compile_options.pedantic = 0;
 150   compile_options.backtrace = 0;
 151   compile_options.sign_zero = 1;
 152   compile_options.range_check = 1;
 153 }
 154
 155 /* Function called by the front-end to tell us the
 156    default for unformatted data conversion.  */
 157
 158 extern void set_convert (int);
 159 export_proto (set_convert);
 160
 161 void
 162 set_convert (int conv)
 163 {
 164   compile_options.convert = conv;
 165 }
 166
 167 extern void set_record_marker (int);
 168 export_proto (set_record_marker);
 169
 170
 171 void
 172 set_record_marker (int val)
 173 {
 174
 175   switch(val)
 176     {
 177     case 4:
 178       compile_options.record_marker = sizeof (GFC_INTEGER_4);
 179       break;
 180
 181     case 8:
 182       compile_options.record_marker = sizeof (GFC_INTEGER_8);
 183       break;
 184
 185     default:
 186       runtime_error ("Invalid value for record marker");
 187       break;
 188     }
 189 }
 190
 191 extern void set_max_subrecord_length (int);
 192 export_proto (set_max_subrecord_length);
 193
 194 void set_max_subrecord_length(int val)
 195 {
 196   if (val > GFC_MAX_SUBRECORD_LENGTH || val < 1)
 197     {
 198       runtime_error ("Invalid value for maximum subrecord length");
 199       return;
 200     }
 201
 202   compile_options.max_subrecord_length = val;
 203 }