summaryrefslogtreecommitdiffstats
path: root/Modules/fpetestmodule.c
blob: aa14dd82a6b294819521cf530cecb1335c4b118e (plain)
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
/*
     ---------------------------------------------------------------------  
    /                       Copyright (c) 1996.                           \ 
   |          The Regents of the University of California.                 |
   |                        All rights reserved.                           |
   |                                                                       |
   |   Permission to use, copy, modify, and distribute this software for   |
   |   any purpose without fee is hereby granted, provided that this en-   |
   |   tire notice is included in all copies of any software which is or   |
   |   includes  a  copy  or  modification  of  this software and in all   |
   |   copies of the supporting documentation for such software.           |
   |                                                                       |
   |   This  work was produced at the University of California, Lawrence   |
   |   Livermore National Laboratory under  contract  no.  W-7405-ENG-48   |
   |   between  the  U.S.  Department  of  Energy and The Regents of the   |
   |   University of California for the operation of UC LLNL.              |
   |                                                                       |
   |                              DISCLAIMER                               |
   |                                                                       |
   |   This  software was prepared as an account of work sponsored by an   |
   |   agency of the United States Government. Neither the United States   |
   |   Government  nor the University of California nor any of their em-   |
   |   ployees, makes any warranty, express or implied, or  assumes  any   |
   |   liability  or  responsibility  for the accuracy, completeness, or   |
   |   usefulness of any information,  apparatus,  product,  or  process   |
   |   disclosed,   or  represents  that  its  use  would  not  infringe   |
   |   privately-owned rights. Reference herein to any specific  commer-   |
   |   cial  products,  process,  or  service  by trade name, trademark,   |
   |   manufacturer, or otherwise, does not  necessarily  constitute  or   |
   |   imply  its endorsement, recommendation, or favoring by the United   |
   |   States Government or the University of California. The views  and   |
   |   opinions  of authors expressed herein do not necessarily state or   |
   |   reflect those of the United States Government or  the  University   |
   |   of  California,  and shall not be used for advertising or product   |
    \  endorsement purposes.                                              / 
     ---------------------------------------------------------------------  
*/

/*
		  Floating point exception test module.

 */

#include "Python.h"

static PyObject *fpe_error;
PyMODINIT_FUNC initfpetest(void);
static PyObject *test(PyObject *self,PyObject *args);
static double db0(double);
static double overflow(double);
static double nest1(int, double);
static double nest2(int, double);
static double nest3(double);
static void printerr(double);

static PyMethodDef fpetest_methods[] = {
    {"test",		 (PyCFunction) test,		 METH_VARARGS},
    {0,0}
};

static PyObject *test(PyObject *self,PyObject *args)
{
    double r;

    fprintf(stderr,"overflow");
    r = overflow(1.e160);
    printerr(r);

    fprintf(stderr,"\ndiv by 0");
    r = db0(0.0);
    printerr(r);

    fprintf(stderr,"\nnested outer");
    r = nest1(0, 0.0);
    printerr(r);

    fprintf(stderr,"\nnested inner");
    r = nest1(1, 1.0);
    printerr(r);

    fprintf(stderr,"\ntrailing outer");
    r = nest1(2, 2.0);
    printerr(r);

    fprintf(stderr,"\nnested prior");
    r = nest2(0, 0.0);
    printerr(r);

    fprintf(stderr,"\nnested interior");
    r = nest2(1, 1.0);
    printerr(r);

    fprintf(stderr,"\nnested trailing");
    r = nest2(2, 2.0);
    printerr(r);

    Py_INCREF (Py_None);
    return Py_None;
}

static void printerr(double r)
{
    if(r == 3.1416){
      fprintf(stderr,"\tPASS\n");
      PyErr_Print();
    }else{
      fprintf(stderr,"\tFAIL\n");
    }
    PyErr_Clear();
}

static double nest1(int i, double x)
{
  double a = 1.0;

  PyFPE_START_PROTECT("Division by zero, outer zone", return 3.1416)
  if(i == 0){
    a = 1./x;
  }else if(i == 1){
    /* This (following) message is never seen. */
    PyFPE_START_PROTECT("Division by zero, inner zone", return 3.1416)
    a = 1./(1. - x);
    PyFPE_END_PROTECT(a)
  }else if(i == 2){
    a = 1./(2. - x);
  }
  PyFPE_END_PROTECT(a)

  return a;
}

static double nest2(int i, double x)
{
  double a = 1.0;
  PyFPE_START_PROTECT("Division by zero, prior error", return 3.1416)
  if(i == 0){
    a = 1./x;
  }else if(i == 1){
    a = nest3(x);
  }else if(i == 2){
    a = 1./(2. - x);
  }
  PyFPE_END_PROTECT(a)
  return a;
}

static double nest3(double x)
{
  double result;
  /* This (following) message is never seen. */
  PyFPE_START_PROTECT("Division by zero, nest3 error", return 3.1416)
  result = 1./(1. - x);
  PyFPE_END_PROTECT(result)
  return result;
}

static double db0(double x)
{
  double a;
  PyFPE_START_PROTECT("Division by zero", return 3.1416)
  a = 1./x;
  PyFPE_END_PROTECT(a)
  return a;
}

static double overflow(double b)
{
  double a;
  PyFPE_START_PROTECT("Overflow", return 3.1416)
  a = b*b;
  PyFPE_END_PROTECT(a)
  return a;
}

PyMODINIT_FUNC initfpetest(void)
{
    PyObject *m, *d;

    m = Py_InitModule("fpetest", fpetest_methods);
    d = PyModule_GetDict(m);
    fpe_error = PyErr_NewException("fpetest.error", NULL, NULL);
    if (fpe_error != NULL)
	    PyDict_SetItemString(d, "error", fpe_error);
}