libgfortran/runtime/stop.c

   1 /* Implementation of the STOP statement.
   2    Copyright (C) 2002-2018 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 3 of the License, or (at your option) any later version.
  11
  12 Libgfortran is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #include "libgfortran.h"
  27
  28 #ifdef HAVE_UNISTD_H
  29 #include <unistd.h>
  30 #endif
  31
  32
  33 /* Fortran 2008 demands: If any exception (14) is signaling on that image, the
  34    processor shall issue a warning indicating which exceptions are signaling;
  35    this warning shall be on the unit identified by the named constant
  36    ERROR_UNIT (13.8.2.8).  In line with other compilers, we do not report
  37    inexact - and we optionally ignore underflow, cf. thread starting at
  38    http://mailman.j3-fortran.org/pipermail/j3/2013-June/006452.html.  */
  39
  40 static void
  41 report_exception (void)
  42 {
  43   int set_excepts;
  44
  45   if (!compile_options.fpe_summary)
  46     return;
  47
  48   set_excepts = get_fpu_except_flags ();
  49   if ((set_excepts & compile_options.fpe_summary) == 0)
  50     return;
  51
  52   estr_write ("Note: The following floating-point exceptions are signalling:");
  53
  54   if ((compile_options.fpe_summary & GFC_FPE_INVALID)
  55       && (set_excepts & GFC_FPE_INVALID))
  56     estr_write (" IEEE_INVALID_FLAG");
  57
  58   if ((compile_options.fpe_summary & GFC_FPE_ZERO)
  59       && (set_excepts & GFC_FPE_ZERO))
  60     estr_write (" IEEE_DIVIDE_BY_ZERO");
  61
  62   if ((compile_options.fpe_summary & GFC_FPE_OVERFLOW)
  63       && (set_excepts & GFC_FPE_OVERFLOW))
  64     estr_write (" IEEE_OVERFLOW_FLAG");
  65
  66   if ((compile_options.fpe_summary & GFC_FPE_UNDERFLOW)
  67       && (set_excepts & GFC_FPE_UNDERFLOW))
  68     estr_write (" IEEE_UNDERFLOW_FLAG");
  69
  70   if ((compile_options.fpe_summary & GFC_FPE_DENORMAL)
  71       && (set_excepts & GFC_FPE_DENORMAL))
  72     estr_write (" IEEE_DENORMAL");
  73
  74   if ((compile_options.fpe_summary & GFC_FPE_INEXACT)
  75       && (set_excepts & GFC_FPE_INEXACT))
  76     estr_write (" IEEE_INEXACT_FLAG");
  77
  78   estr_write ("\n");
  79 }
  80
  81
  82 /* A numeric STOP statement.  */
  83
  84 extern _Noreturn void stop_numeric (int, bool);
  85 export_proto(stop_numeric);
  86
  87 void
  88 stop_numeric (int code, bool quiet)
  89 {
  90   if (!quiet)
  91     {
  92       report_exception ();
  93       st_printf ("STOP %d\n", code);
  94     }
  95   exit (code);
  96 }
  97
  98
  99 /* A character string or blank STOP statement.  */
 100
 101 void
 102 stop_string (const char *string, size_t len, bool quiet)
 103 {
 104   if (!quiet)
 105     {
 106       report_exception ();
 107       if (string)
 108         {
 109           estr_write ("STOP ");
 110           (void) write (STDERR_FILENO, string, len);
 111           estr_write ("\n");
 112         }
 113     }
 114   exit (0);
 115 }
 116
 117
 118 /* Per Fortran 2008, section 8.4:  "Execution of a STOP statement initiates
 119    normal termination of execution. Execution of an ERROR STOP statement
 120    initiates error termination of execution."  Thus, error_stop_string returns
 121    a nonzero exit status code.  */
 122
 123 extern _Noreturn void error_stop_string (const char *, size_t, bool);
 124 export_proto(error_stop_string);
 125
 126 void
 127 error_stop_string (const char *string, size_t len, bool quiet)
 128 {
 129   if (!quiet)
 130     {
 131       report_exception ();
 132       estr_write ("ERROR STOP ");
 133       (void) write (STDERR_FILENO, string, len);
 134       estr_write ("\n");
 135     }
 136   exit_error (1);
 137 }
 138
 139
 140 /* A numeric ERROR STOP statement.  */
 141
 142 extern _Noreturn void error_stop_numeric (int, bool);
 143 export_proto(error_stop_numeric);
 144
 145 void
 146 error_stop_numeric (int code, bool quiet)
 147 {
 148   if (!quiet)
 149     {
 150       report_exception ();
 151       st_printf ("ERROR STOP %d\n", code);
 152     }
 153   exit_error (code);
 154 }