libgfortran/runtime/stop.c

   1 /* Implementation of the STOP statement.
   2    Copyright (C) 2002-2016 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 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #ifdef HAVE_UNISTD_H
  31 #include <unistd.h>
  32 #endif
  33
  34
  35 /* Fortran 2008 demands: If any exception (14) is signaling on that image, the
  36    processor shall issue a warning indicating which exceptions are signaling;
  37    this warning shall be on the unit identified by the named constant
  38    ERROR_UNIT (13.8.2.8).  In line with other compilers, we do not report
  39    inexact - and we optionally ignore underflow, cf. thread starting at
  40    http://mailman.j3-fortran.org/pipermail/j3/2013-June/006452.html.  */
  41
  42 static void
  43 report_exception (void)
  44 {
  45   int set_excepts;
  46
  47   if (!compile_options.fpe_summary)
  48     return;
  49
  50   set_excepts = get_fpu_except_flags ();
  51   if ((set_excepts & compile_options.fpe_summary) == 0)
  52     return;
  53
  54   estr_write ("Note: The following floating-point exceptions are signalling:");
  55
  56   if ((compile_options.fpe_summary & GFC_FPE_INVALID)
  57       && (set_excepts & GFC_FPE_INVALID))
  58     estr_write (" IEEE_INVALID_FLAG");
  59
  60   if ((compile_options.fpe_summary & GFC_FPE_ZERO)
  61       && (set_excepts & GFC_FPE_ZERO))
  62     estr_write (" IEEE_DIVIDE_BY_ZERO");
  63
  64   if ((compile_options.fpe_summary & GFC_FPE_OVERFLOW)
  65       && (set_excepts & GFC_FPE_OVERFLOW))
  66     estr_write (" IEEE_OVERFLOW_FLAG");
  67
  68   if ((compile_options.fpe_summary & GFC_FPE_UNDERFLOW)
  69       && (set_excepts & GFC_FPE_UNDERFLOW))
  70     estr_write (" IEEE_UNDERFLOW_FLAG");
  71
  72   if ((compile_options.fpe_summary & GFC_FPE_DENORMAL)
  73       && (set_excepts & GFC_FPE_DENORMAL))
  74     estr_write (" IEEE_DENORMAL");
  75
  76   if ((compile_options.fpe_summary & GFC_FPE_INEXACT)
  77       && (set_excepts & GFC_FPE_INEXACT))
  78     estr_write (" IEEE_INEXACT_FLAG");
  79
  80   estr_write ("\n");
  81 }
  82
  83
  84 /* A numeric STOP statement.  */
  85
  86 extern _Noreturn void stop_numeric (GFC_INTEGER_4);
  87 export_proto(stop_numeric);
  88
  89 void
  90 stop_numeric (GFC_INTEGER_4 code)
  91 {
  92   report_exception ();
  93   if (code == -1)
  94     code = 0;
  95   else
  96     st_printf ("STOP %d\n", (int)code);
  97
  98   exit (code);
  99 }
 100
 101
 102 /* A Fortran 2008 numeric STOP statement.  */
 103
 104 extern _Noreturn void stop_numeric_f08 (GFC_INTEGER_4);
 105 export_proto(stop_numeric_f08);
 106
 107 void
 108 stop_numeric_f08 (GFC_INTEGER_4 code)
 109 {
 110   report_exception ();
 111   st_printf ("STOP %d\n", (int)code);
 112   exit (code);
 113 }
 114
 115
 116 /* A character string or blank STOP statement.  */
 117
 118 void
 119 stop_string (const char *string, GFC_INTEGER_4 len)
 120 {
 121   report_exception ();
 122   if (string)
 123     {
 124       estr_write ("STOP ");
 125       (void) write (STDERR_FILENO, string, len);
 126       estr_write ("\n");
 127     }
 128   exit (0);
 129 }
 130
 131
 132 /* Per Fortran 2008, section 8.4:  "Execution of a STOP statement initiates
 133    normal termination of execution. Execution of an ERROR STOP statement
 134    initiates error termination of execution."  Thus, error_stop_string returns
 135    a nonzero exit status code.  */
 136
 137 extern _Noreturn void error_stop_string (const char *, GFC_INTEGER_4);
 138 export_proto(error_stop_string);
 139
 140 void
 141 error_stop_string (const char *string, GFC_INTEGER_4 len)
 142 {
 143   report_exception ();
 144   estr_write ("ERROR STOP ");
 145   (void) write (STDERR_FILENO, string, len);
 146   estr_write ("\n");
 147
 148   exit_error (1);
 149 }
 150
 151
 152 /* A numeric ERROR STOP statement.  */
 153
 154 extern _Noreturn void error_stop_numeric (GFC_INTEGER_4);
 155 export_proto(error_stop_numeric);
 156
 157 void
 158 error_stop_numeric (GFC_INTEGER_4 code)
 159 {
 160   report_exception ();
 161   st_printf ("ERROR STOP %d\n", (int) code);
 162   exit_error (code);
 163 }