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Changes for Lee Busby's SIGFPE patch set. 

Two new modules fpectl and fpetest.
Surround various and sundry f.p. operations with PyFPE_*_PROTECT macros.
This commit is contained in:
Guido van Rossum 1997-02-14 22:59:58 +00:00
parent 0ae748d3c4
commit 52fa3a6909
8 changed files with 492 additions and 1 deletions
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6
Modules/_tkinter.c
View File

@ -724,10 +724,14 @@ Tkapp_ExprDouble (self, args)
{
char *s;
double v;
int retval;
if (!PyArg_Parse(args, "s", &s))
return NULL;
if (Tcl_ExprDouble(Tkapp_Interp(self), s, &v) == TCL_ERROR)
PyFPE_START_PROTECT("Tkapp_ExprDouble", return 0)
retval = Tcl_ExprDouble (Tkapp_Interp (self), s, &v);
PyFPE_END_PROTECT
if (retval == TCL_ERROR)
return Tkinter_Error(self);
return Py_BuildValue("d", v);
}

2
Modules/cmathmodule.c
View File

@ -247,7 +247,9 @@ math_1(args, func)
if (!PyArg_ParseTuple(args, "D", &x))
return NULL;
errno = 0;
PyFPE_START_PROTECT("complex function", return 0)
x = (*func)(x);
PyFPE_END_PROTECT
CHECK(x.real);
CHECK(x.imag);
if (errno != 0)

244
Modules/fpectlmodule.c Normal file
View File

@ -0,0 +1,244 @@
/*
---------------------------------------------------------------------
/ 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 control module.
This Python module provides bare-bones control over floating point
units from several hardware manufacturers. Specifically, it allows
the user to turn on the generation of SIGFPE whenever any of the
three serious IEEE 754 exceptions (Division by Zero, Overflow,
Invalid Operation) occurs. We currently ignore Underflow and
Inexact Result exceptions, although those could certainly be added
if desired.
The module also establishes a signal handler for SIGFPE during
initialization. This builds on code found in the Python
distribution at Include/pyfpe.h and Python/pyfpe.c. If those files
are not in your Python distribution, find them in a patch at
ftp://icf.llnl.gov/pub/python/busby/patches.961108.tgz.
This module is only useful to you if it happens to include code
specific for your hardware and software environment. If you can
contribute OS-specific code for new platforms, or corrections for
the code provided, it will be greatly appreciated.
** Version 1.0: September 20, 1996. Lee Busby, LLNL.
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "Python.h"
#include <signal.h>
#ifndef WANT_SIGFPE_HANDLER
/* Define locally if they are not defined in Python. This gives only
* the limited control to induce a core dump in case of an exception.
*/
static jmp_buf PyFPE_jbuf;
static int PyFPE_counter = 0;
#endif
typedef RETSIGTYPE Sigfunc(int);
static Sigfunc sigfpe_handler;
static void fpe_reset(Sigfunc *);
static PyObject *fpe_error;
void initfpectl(void);
static PyObject *turnon_sigfpe (PyObject *self,PyObject *args);
static PyObject *turnoff_sigfpe (PyObject *self,PyObject *args);
static PyMethodDef fpectl_methods[] = {
{"turnon_sigfpe", (PyCFunction) turnon_sigfpe, 1},
{"turnoff_sigfpe", (PyCFunction) turnoff_sigfpe, 1},
{0,0}
};
static PyObject *turnon_sigfpe(PyObject *self,PyObject *args)
{
/* Do any architecture-specific one-time only initialization here. */
fpe_reset(sigfpe_handler);
Py_INCREF (Py_None);
return Py_None;
}
static void fpe_reset(Sigfunc *handler)
{
/* Reset the exception handling machinery, and reset the signal
* handler for SIGFPE to the given handler.
*/
/*-- IRIX -----------------------------------------------------------------*/
#if defined(sgi)
/* See man page on handle_sigfpes -- must link with -lfpe
* My usage doesn't follow the man page exactly. Maybe somebody
* else can explain handle_sigfpes to me....
* cc -c -I/usr/local/python/include fpectlmodule.c
* ld -shared -o fpectlmodule.so fpectlmodule.o -lfpe
*/
#include <sigfpe.h>
typedef void user_routine (unsigned[5], int[2]);
typedef void abort_routine (unsigned long);
handle_sigfpes(_OFF, 0,
(user_routine *)0,
_TURN_OFF_HANDLER_ON_ERROR,
(abort_routine*)0);
handle_sigfpes(_ON, _EN_OVERFL | _EN_DIVZERO | _EN_INVALID,
(user_routine *)0,
_ABORT_ON_ERROR,
(abort_routine*)0);
signal(SIGFPE, handler);
/*-- SunOS and Solaris ----------------------------------------------------*/
#elif defined(sun)
/* References: ieee_handler, ieee_sun, ieee_functions, and ieee_flags
man pages (SunOS or Solaris)
cc -c -I/usr/local/python/include fpectlmodule.c
ld -G -o fpectlmodule.so -L/opt/SUNWspro/lib fpectlmodule.o -lsunmath -lm
*/
#include <math.h>
char *mode="exception", *in="all", *out;
(void) nonstandard_arithmetic();
(void) ieee_flags("clearall",mode,in,&out);
(void) ieee_handler("set","common",(sigfpe_handler_type)handler);
signal(SIGFPE, handler);
/*-- HPUX -----------------------------------------------------------------*/
#elif defined(__hppa) || defined(hppa)
/* References: fpsetmask man page */
/* cc -Aa +z -c -I/usr/local/python/include fpectlmodule.c */
/* ld -b -o fpectlmodule.sl fpectlmodule.o -lm */
#include <math.h>
fpsetdefaults();
signal(SIGFPE, handler);
/*-- IBM AIX --------------------------------------------------------------*/
#elif defined(__AIX) || defined(_AIX)
/* References: fp_trap, fp_enable man pages */
#include <fptrap.h>
fp_trap(FP_TRAP_SYNC);
fp_enable(TRP_INVALID | TRP_DIV_BY_ZERO | TRP_OVERFLOW);
signal(SIGFPE, handler);
/*-- DEC ALPHA OSF --------------------------------------------------------*/
#elif defined(__alpha)
/* References: exception_intro, ieee man pages */
/* cc -c -I/usr/local/python/include fpectlmodule.c */
/* ld -shared -o fpectlmodule.so fpectlmodule.o */
#include <machine/fpu.h>
unsigned long fp_control =
IEEE_TRAP_ENABLE_INV | IEEE_TRAP_ENABLE_DZE | IEEE_TRAP_ENABLE_OVF;
ieee_set_fp_control(fp_control);
signal(SIGFPE, handler);
/*-- Cray Unicos ----------------------------------------------------------*/
#elif defined(cray)
/* UNICOS delivers SIGFPE by default, but no matherr */
#ifdef HAS_LIBMSET
libmset(-1);
#endif
signal(SIGFPE, handler);
/*-- Linux ----------------------------------------------------------------*/
#elif defined(linux)
/* Linux delivers SIGFPE by default,
except for log(0), atanh(-1), 0.^0.
*/
signal(SIGFPE, handler);
/*-- NeXT -----------------------------------------------------------------*/
#elif defined(NeXT) && defined(m68k) && defined(__GNUC__)
/* NeXT needs explicit csr set to generate SIGFPE */
asm("fmovel #0x1400,fpcr"); /* set OVFL and ZD bits */
signal(SIGFPE, handler);
/*-- Microsoft Windows, NT ------------------------------------------------*/
#elif defined(_MSC_VER)
/* Reference: Visual C++ Books Online 4.2,
Run-Time Library Reference, _control87, _controlfp */
#include <float.h>
unsigned int cw = _EM_INVALID | _EM_ZERODIVIDE | _EM_OVERFLOW;
(void)_controlfp(0, cw);
signal(SIGFPE, handler);
/*-- Give Up --------------------------------------------------------------*/
#else
fputs("Operation not implemented\n", stderr);
#endif
}
static PyObject *turnoff_sigfpe(PyObject *self,PyObject *args)
{
fputs("Operation not implemented\n", stderr);
Py_INCREF (Py_None);
return Py_None;
}
static void sigfpe_handler(int signo)
{
fpe_reset(sigfpe_handler);
if(PyFPE_counter) {
longjmp(PyFPE_jbuf, 1);
} else {
Py_FatalError("Unprotected floating point exception");
}
}
void initfpectl(void)
{
PyObject *m, *d;
static int already_initialized = 0;
if (already_initialized) return;
m = Py_InitModule("fpectl", fpectl_methods);
d = PyModule_GetDict(m);
fpe_error = PyString_FromString("fpectl.error");
PyDict_SetItemString(d, "error", fpe_error);
if (PyErr_Occurred())
Py_FatalError("Cannot initialize module fpectl");
already_initialized = 1;
}
#ifdef __cplusplus
}
#endif

228
Modules/fpetestmodule.c Normal file
View File

@ -0,0 +1,228 @@
/*
---------------------------------------------------------------------
/ 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;
void initfpetest(void);
static PyObject *test(PyObject *self,PyObject *args);
static int db0(void);
static int overflow(void);
static int nest1(double);
static int nest2(double);
static double nest3(double);
static PyMethodDef fpetest_methods[] = {
{"test", (PyCFunction) test, 1},
{0,0}
};
static PyObject *test(PyObject *self,PyObject *args)
{
int i = 0, r;
fprintf(stderr,"Test trapping overflow\n");
r = overflow();
if(r){
fprintf(stderr,"(Note: No exception was raised.)\n");
PyErr_Clear();
}else{
fprintf(stderr,"Trapped:: ");
PyErr_Print();
PyErr_Clear();
}
i += r;
fprintf(stderr,"Test trapping division by zero\n");
r = db0();
if(r){
fprintf(stderr,"(Note: No exception was raised.)\n");
PyErr_Clear();
}else{
fprintf(stderr,"Trapped:: ");
PyErr_Print();
PyErr_Clear();
}
i += r;
fprintf(stderr,"Test nested protection zones, outer zone\n");
r = nest1(0.0);
if(r){
fprintf(stderr,"(Note: No exception was raised.)\n");
PyErr_Clear();
}else{
fprintf(stderr,"Trapped:: ");
PyErr_Print();
PyErr_Clear();
}
i += r;
fprintf(stderr,"Test nested protection zones, inner zone\n");
fprintf(stderr,"(Note: Return will apparently come from outer zone.)\n");
r = nest1(1.0);
if(r){
fprintf(stderr,"(Note: No exception was raised.)\n");
PyErr_Clear();
}else{
fprintf(stderr,"Trapped:: ");
PyErr_Print();
PyErr_Clear();
}
i += r;
fprintf(stderr,"Test nested protection zones, trailing outer zone\n");
r = nest1(2.0);
if(r){
fprintf(stderr,"(Note: No exception was raised.)\n");
PyErr_Clear();
}else{
fprintf(stderr,"Trapped:: ");
PyErr_Print();
PyErr_Clear();
}
i += r;
fprintf(stderr,"Test nested function calls, prior error\n");
r = nest2(0.0);
if(r){
fprintf(stderr,"(Note: No exception was raised.)\n");
PyErr_Clear();
}else{
fprintf(stderr,"Trapped:: ");
PyErr_Print();
PyErr_Clear();
}
i += r;
fprintf(stderr,"Test nested function calls, interior error\n");
r = nest2(1.0);
if(r){
fprintf(stderr,"(Note: No exception was raised.)\n");
PyErr_Clear();
}else{
fprintf(stderr,"Trapped:: ");
PyErr_Print();
PyErr_Clear();
}
i += r;
fprintf(stderr,"Test nested function calls, trailing error\n");
r = nest2(2.0);
if(r){
fprintf(stderr,"(Note: No exception was raised.)\n");
PyErr_Clear();
}else{
fprintf(stderr,"Trapped:: ");
PyErr_Print();
PyErr_Clear();
}
i += r;
fprintf(stderr,"Number of tests failed: %d\n", i);
Py_INCREF (Py_None);
return Py_None;
}
static int nest1(double x)
{
double a = 1.0;
PyFPE_START_PROTECT("Division by zero, outer zone", return 0)
a = 1./x;
PyFPE_START_PROTECT("Division by zero, inner zone", return 0)
a = 1./(1. - x);
PyFPE_END_PROTECT
a = 1./(2. - x);
PyFPE_END_PROTECT
return(1);
}
static int nest2(double x)
{
double a = 1.0;
PyFPE_START_PROTECT("Division by zero, prior error", return 0)
a = 1./x;
a = nest3(x);
a = 1./(2. - x);
PyFPE_END_PROTECT
return(1);
}
static double nest3(double x)
{
double result;
PyFPE_START_PROTECT("Division by zero, nest3 error", return 0)
result = 1./(1. - x);
PyFPE_END_PROTECT
return result;
}
static int db0(void)
{
double a = 1.0;
PyFPE_START_PROTECT("Division by zero", return 0)
a = 1./(a - 1.);
PyFPE_END_PROTECT
return(1);
}
static int overflow(void)
{
double a, b = 1.e200;
PyFPE_START_PROTECT("Overflow", return 0)
a = b*b;
PyFPE_END_PROTECT
return(1);
}
void initfpetest(void)
{
PyObject *m, *d;
m = Py_InitModule("fpetest", fpetest_methods);
d = PyModule_GetDict(m);
fpe_error = PyString_FromString("fpetest.error");
PyDict_SetItemString(d, "error", fpe_error);
if (PyErr_Occurred())
Py_FatalError("Cannot initialize module fpetest");
}

2
Modules/imgfile.c
View File

@ -387,8 +387,10 @@ PyObject *args;
iclose(image);
return NULL;
}
PyFPE_START_PROTECT("readscaled", return 0)
xfac = (float)xsize/(float)xwtd;
yfac = (float)ysize/(float)ywtd;
PyFPE_END_PROTECT
cdatap = PyString_AsString(rv);
idatap = (long *)cdatap;

6
Modules/mathmodule.c
View File

@ -80,7 +80,9 @@ math_1(args, func)
if (! PyArg_Parse(args, "d", &x))
return NULL;
errno = 0;
PyFPE_START_PROTECT("in math_1", return 0)
x = (*func)(x);
PyFPE_END_PROTECT
CHECK(x);
if (errno != 0)
return math_error();
@ -97,7 +99,9 @@ math_2(args, func)
if (! PyArg_Parse(args, "(dd)", &x, &y))
return NULL;
errno = 0;
PyFPE_START_PROTECT("in math_2", return 0)
x = (*func)(x, y);
PyFPE_END_PROTECT
CHECK(x);
if (errno != 0)
return math_error();
@ -173,7 +177,9 @@ math_ldexp(self, args)
if (! PyArg_Parse(args, "(dd)", &x, &y))
return NULL;
errno = 0;
PyFPE_START_PROTECT("ldexp", return 0)
x = ldexp(x, (int)y);
PyFPE_END_PROTECT
CHECK(x);
if (errno != 0)
return math_error();

3
Modules/mpzmodule.c
View File

@ -1488,6 +1488,8 @@ mpz_float(self)
/* let those bits come, let those bits go,
e.g. dismantle mpzscratch, build PyFloatObject */
/* Can this overflow? Dunno, protect against that possibility. */
PyFPE_START_PROTECT("mpz_float", return 0)
x = 0.0;
mulstate = 1.0;
while (i--) {
@ -1495,6 +1497,7 @@ mpz_float(self)
mulstate *= multiplier;
mpz_div_2exp(&mpzscratch, &mpzscratch, BITS_PER_MP_LIMB);
}
PyFPE_END_PROTECT
assert(mpz_cmp_ui(&mpzscratch, (unsigned long int)0) == 0);
mpz_clear(&mpzscratch);

2
Modules/stropmodule.c
View File

@ -661,7 +661,9 @@ strop_atof(self, args)
return NULL;
}
errno = 0;
PyFPE_START_PROTECT("strop_atof", return 0)
x = strtod(s, &end);
PyFPE_END_PROTECT
while (*end && isspace(Py_CHARMASK(*end)))
end++;
if (*end != '\0') {