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cpython/Modules/fpetestmodule.c at 3.5 · python/cpython · GitHub
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/*
---------------------------------------------------------------------
/ 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
PyInit_fpetest
(
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
;
}
static
struct
PyModuleDef
fpetestmodule
=
{
PyModuleDef_HEAD_INIT
,
"fpetest"
,
NULL
,
-1
,
fpetest_methods
,
NULL
,
NULL
,
NULL
,
NULL
};
PyMODINIT_FUNC
PyInit_fpetest
(
void
)
{
PyObject
*
m
,
*
d
;
m
=
PyModule_Create
(
&
fpetestmodule
);
if
(
m
==
NULL
)
return
NULL
;
d
=
PyModule_GetDict
(
m
);
fpe_error
=
PyErr_NewException
(
"fpetest.error"
,
NULL
,
NULL
);
if
(
fpe_error
!=
NULL
)
PyDict_SetItemString
(
d
,
"error"
,
fpe_error
);
return
m
;
}
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