summary refs log tree commit diff
path: root/math/test-fenv.c
blob: 62a148b3dc54b1bc55c5a6d6bb472db492c1dd8d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
/* Copyright (C) 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Andreas Jaeger <aj@arthur.rhein-neckar.de> and
   Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* Tests for ISO C 9X 7.6: Floating-point environment  */

#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif

#include <complex.h>
#include <math.h>
#include <float.h>
#include <fenv.h>

#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>

/*
  Since not all architectures might define all exceptions, we define
  a private set and map accordingly.
*/
#define NO_EXC 0
#define INEXACT_EXC 0x1
#define DIVBYZERO_EXC 0x2
#define UNDERFLOW_EXC 0x04
#define OVERFLOW_EXC 0x08
#define INVALID_EXC 0x10
#define ALL_EXC \
        (INEXACT_EXC | DIVBYZERO_EXC | UNDERFLOW_EXC | OVERFLOW_EXC | \
         INVALID_EXC)

static int count_errors;

/* Test whether a given exception was raised.  */
static void
test_single_exception (short int exception,
                       short int exc_flag,
                       fexcept_t fe_flag,
                       const char *flag_name)
{
  if (exception & exc_flag)
    {
      if (fetestexcept (fe_flag))
        printf ("  Pass: Exception \"%s\" is set\n", flag_name);
      else
        {
          printf ("  Fail: Exception \"%s\" is not set\n", flag_name);
          ++count_errors;
        }
    }
  else
    {
      if (fetestexcept (fe_flag))
        {
          printf ("  Fail: Exception \"%s\" is set\n", flag_name);
          ++count_errors;
        }
      else
        {
          printf ("  Pass: Exception \"%s\" is not set\n", flag_name);
        }
    }
}

static void
test_exceptions (const char *test_name, short int exception)
{
  printf ("Test: %s\n", test_name);
#ifdef FE_DIVBYZERO
  test_single_exception (exception, DIVBYZERO_EXC, FE_DIVBYZERO,
                         "DIVBYZERO");
#endif
#ifdef FE_INVALID
  test_single_exception (exception, INVALID_EXC, FE_INVALID,
                         "INVALID");
#endif
#ifdef FE_INEXACT
  test_single_exception (exception, INEXACT_EXC, FE_INEXACT,
                         "INEXACT");
#endif
#ifdef FE_UNDERFLOW
  test_single_exception (exception, UNDERFLOW_EXC, FE_UNDERFLOW,
                         "UNDERFLOW");
#endif
#ifdef FE_OVERFLOW
  test_single_exception (exception, OVERFLOW_EXC, FE_OVERFLOW,
                         "OVERFLOW");
#endif
}

static void
print_rounding (int rounding)
{

  switch (rounding) {
#ifdef FE_TONEAREST
  case FE_TONEAREST:
    printf ("TONEAREST");
    break;
#endif
#ifdef FE_UPWARD
  case FE_UPWARD:
    printf ("UPWARD");
    break;
#endif
#ifdef FE_DOWNWARD
  case FE_DOWNWARD:
    printf ("DOWNWARD");
    break;
#endif
#ifdef FE_TOWARDZERO
  case FE_TOWARDZERO:
    printf ("TOWARDZERO");
    break;
#endif
  }
  printf (".\n");
}


static void
test_rounding (const char *test_name, int rounding_mode)
{
  int curr_rounding = fegetround ();

  printf ("Test: %s\n", test_name);
  if (curr_rounding == rounding_mode)
    {
      printf ("  Pass: Rounding mode is ");
      print_rounding (curr_rounding);
    }
  else {
    ++count_errors;
    printf ("  Fail: Rounding mode is ");
    print_rounding (curr_rounding);
  }
}


static void
set_single_exc (const char *test_name, int fe_exc, fexcept_t exception)
{
  char str[200];

  strcpy (str, test_name);
  strcat (str, ": set flag, with rest not set");
  feclearexcept (FE_ALL_EXCEPT);
  feraiseexcept (exception);
  test_exceptions (str, fe_exc);

  strcpy (str, test_name);
  strcat (str, ": clear flag, rest also unset");
  feclearexcept (exception);
  test_exceptions (str, NO_EXC);

  strcpy (str, test_name);
  strcat (str, ": set flag, with rest set");
  feraiseexcept (FE_ALL_EXCEPT ^ exception);
  feraiseexcept (exception);
  test_exceptions (str, ALL_EXC);

  strcpy (str, test_name);
  strcat (str, ": clear flag, leave rest set");
  feclearexcept (exception);
  test_exceptions (str, ALL_EXC ^ fe_exc);
}

static void
fe_tests (void)
{
  /* clear all exceptions and test if all are cleared */
  feclearexcept (FE_ALL_EXCEPT);
  test_exceptions ("feclearexcept (FE_ALL_EXCEPT) clears all exceptions",
                   NO_EXC);

  /* raise all exceptions and test if all are raised */
  feraiseexcept (FE_ALL_EXCEPT);
  test_exceptions ("feraiseexcept (FE_ALL_EXCEPT) raises all exceptions",
                   ALL_EXC);
  feclearexcept (FE_ALL_EXCEPT);

#ifdef FE_DIVBYZERO
  set_single_exc ("Set/Clear FE_DIVBYZERO", DIVBYZERO_EXC, FE_DIVBYZERO);
#endif
#ifdef FE_INVALID
  set_single_exc ("Set/Clear FE_INVALID", INVALID_EXC, FE_INVALID);
#endif
#ifdef FE_INEXACT
  set_single_exc ("Set/Clear FE_INEXACT", INEXACT_EXC, FE_INEXACT);
#endif
#ifdef FE_UNDERFLOW
  set_single_exc ("Set/Clear FE_UNDERFLOW", UNDERFLOW_EXC, FE_UNDERFLOW);
#endif
#ifdef FE_OVERFLOW
  set_single_exc ("Set/Clear FE_OVERFLOW", OVERFLOW_EXC, FE_OVERFLOW);
#endif
}

/* Test that program aborts with no masked interrupts */
static void
feenv_nomask_test (const char *flag_name, int fe_exc)
{
  int status;
  pid_t pid;

  printf ("Test: after fesetenv (FE_NOMASK_ENV) processes will abort\n");
  printf ("      when feraiseexcept (%s) is called.\n", flag_name);
  fesetenv (FE_NOMASK_ENV);
  pid = fork  ();
  if (pid == 0)
    {
      feraiseexcept (fe_exc);
      exit (2);
    }
  else if (pid < 0)
    {
      if (errno != ENOSYS)
	{
	  printf ("  Fail: Could not fork.\n");
	  ++count_errors;
	}
      else
	printf ("  `fork' not implemented, test ignored.\n");
    }
  else {
    if (waitpid (pid, &status, 0) != pid)
      {
	printf ("  Fail: waitpid call failed.\n");
	++count_errors;
      }
    else if (WIFSIGNALED (status) && WTERMSIG (status) == SIGFPE)
      printf ("  Pass: Process received SIGFPE.\n");
    else
      {
	printf ("  Fail: Process didn't receive signal and exited with status %d.\n",
		status);
	++count_errors;
      }
  }
}

/* Test that program doesn't abort with default environment */
static void
feenv_mask_test (const char *flag_name, int fe_exc)
{
  int status;
  pid_t pid;

  printf ("Test: after fesetenv (FE_DFL_ENV) processes will not abort\n");
  printf ("      when feraiseexcept (%s) is called.\n", flag_name);
  fesetenv (FE_DFL_ENV);
  pid = fork ();
  if (pid == 0)
    {
      feraiseexcept (fe_exc);
      exit (2);
    }
  else if (pid < 0)
    {
      if (errno != ENOSYS)
	{
	  printf ("  Fail: Could not fork.\n");
	  ++count_errors;
	}
      else
	printf ("  `fork' not implemented, test ignored.\n");
    }
  else {
    if (waitpid (pid, &status, 0) != pid)
      {
	printf ("  Fail: waitpid call failed.\n");
	++count_errors;
      }
    else if (WIFEXITED (status) && WEXITSTATUS (status) == 2)
      printf ("  Pass: Process exited normally.\n");
    else
      {
	printf ("  Fail: Process exited abnormally with status %d.\n",
		status);
	++count_errors;
      }
  }
}



static void
feenv_tests (void)
{

#ifdef FE_DIVBYZERO
  feenv_nomask_test ("FE_DIVBYZERO", FE_DIVBYZERO);
  feenv_mask_test ("FE_DIVBYZERO", FE_DIVBYZERO);
#endif
#ifdef FE_INVALID
  feenv_nomask_test ("FE_INVALID", FE_INVALID);
  feenv_mask_test ("FE_INVALID", FE_INVALID);
#endif
#ifdef FE_INEXACT
  feenv_nomask_test ("FE_INEXACT", FE_INEXACT);
  feenv_mask_test ("FE_INEXACT", FE_INEXACT);
#endif
#ifdef FE_UNDERFLOW
  feenv_nomask_test ("FE_UNDERFLOW", FE_UNDERFLOW);
  feenv_mask_test ("FE_UNDERFLOW", FE_UNDERFLOW);
#endif
#ifdef FE_OVERFLOW
  feenv_nomask_test ("FE_OVERFLOW", FE_OVERFLOW);
  feenv_mask_test ("FE_OVERFLOW", FE_OVERFLOW);
#endif
  fesetenv (FE_DFL_ENV);
}


/* IEC 559 and ISO C 9X define a default startup environment */
static void
initial_tests (void)
{
  test_exceptions ("Initially all exceptions should be cleared",
                   NO_EXC);
  test_rounding ("Rounding direction should be initalized to nearest",
                 FE_TONEAREST);
}

int
main (void)
{
  initial_tests ();
  fe_tests ();
  feenv_tests ();

  if (count_errors)
    {
      printf ("\n%d errors occured.\n", count_errors);
      exit (1);
    }
  printf ("\n All tests passed successfully.\n");
  exit (0);
}