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
report_exception(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
stop_numeric(int code,bool quiet)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
stop_string(const char * string,size_t len,bool quiet)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
error_stop_string(const char * string,size_t len,bool quiet)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
error_stop_numeric(int code,bool quiet)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 }
155