libgfortran/runtime/compile_options.c

   1 /* Handling of compile-time options that influence the library.
   2    Copyright (C) 2005-2016 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 static 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   show_backtrace (true);
 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 #endif
 140
 141 /* Set the usual compile-time options.  */
 142 extern void set_options (int , int []);
 143 export_proto(set_options);
 144
 145 void
 146 set_options (int num, int options[])
 147 {
 148   if (num >= 1)
 149     compile_options.warn_std = options[0];
 150   if (num >= 2)
 151     compile_options.allow_std = options[1];
 152   if (num >= 3)
 153     compile_options.pedantic = options[2];
 154   /* options[3] is the removed -fdump-core option. Its place in the
 155      options array is retained due to ABI compatibility. Remove when
 156      bumping the library ABI.  */
 157   if (num >= 5)
 158     compile_options.backtrace = options[4];
 159   if (num >= 6)
 160     compile_options.sign_zero = options[5];
 161   if (num >= 7)
 162     compile_options.bounds_check = options[6];
 163   /* options[7] is the -frange-check option, which no longer affects
 164      the library behavior; range checking is now always done when
 165      parsing integers. Its place in the options array is retained due
 166      to ABI compatibility. Remove when bumping the library ABI.  */
 167   if (num >= 9)
 168     compile_options.fpe_summary = options[8];
 169
 170 #ifndef LIBGFOR_MINIMAL
 171   /* If backtrace is required, we set signal handlers on the POSIX
 172      2001 signals with core action.  */
 173   if (compile_options.backtrace)
 174     {
 175 #if defined(SIGQUIT)
 176       signal (SIGQUIT, backtrace_handler);
 177 #endif
 178
 179       /* The following 4 signals are defined by C89.  */
 180       signal (SIGILL, backtrace_handler);
 181       signal (SIGABRT, backtrace_handler);
 182       signal (SIGFPE, backtrace_handler);
 183       signal (SIGSEGV, backtrace_handler);
 184
 185 #if defined(SIGBUS)
 186       signal (SIGBUS, backtrace_handler);
 187 #endif
 188
 189 #if defined(SIGSYS)
 190       signal (SIGSYS, backtrace_handler);
 191 #endif
 192
 193 #if defined(SIGTRAP)
 194       signal (SIGTRAP, backtrace_handler);
 195 #endif
 196
 197 #if defined(SIGXCPU)
 198       signal (SIGXCPU, backtrace_handler);
 199 #endif
 200
 201 #if defined(SIGXFSZ)
 202       signal (SIGXFSZ, backtrace_handler);
 203 #endif
 204     }
 205 #endif
 206 }
 207
 208
 209 /* Default values for the compile-time options.  Keep in sync with
 210    gcc/fortran/options.c (gfc_init_options).  */
 211 void
 212 init_compile_options (void)
 213 {
 214   compile_options.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
 215   compile_options.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 216     | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
 217     | GFC_STD_F2008_OBS | GFC_STD_GNU | GFC_STD_LEGACY;
 218   compile_options.pedantic = 0;
 219   compile_options.backtrace = 0;
 220   compile_options.sign_zero = 1;
 221   compile_options.fpe_summary = 0;
 222 }
 223
 224 /* Function called by the front-end to tell us the
 225    default for unformatted data conversion.  */
 226
 227 extern void set_convert (int);
 228 export_proto (set_convert);
 229
 230 void
 231 set_convert (int conv)
 232 {
 233   compile_options.convert = conv;
 234 }
 235
 236 extern void set_record_marker (int);
 237 export_proto (set_record_marker);
 238
 239
 240 void
 241 set_record_marker (int val)
 242 {
 243
 244   switch(val)
 245     {
 246     case 4:
 247       compile_options.record_marker = sizeof (GFC_INTEGER_4);
 248       break;
 249
 250     case 8:
 251       compile_options.record_marker = sizeof (GFC_INTEGER_8);
 252       break;
 253
 254     default:
 255       runtime_error ("Invalid value for record marker");
 256       break;
 257     }
 258 }
 259
 260 extern void set_max_subrecord_length (int);
 261 export_proto (set_max_subrecord_length);
 262
 263 void set_max_subrecord_length(int val)
 264 {
 265   if (val > GFC_MAX_SUBRECORD_LENGTH || val < 1)
 266     {
 267       runtime_error ("Invalid value for maximum subrecord length");
 268       return;
 269     }
 270
 271   compile_options.max_subrecord_length = val;
 272 }