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annotate Modules/fpectlmodule.c @ 58765:2ba7677bfa95 legacy-trunk

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testCopysign was defined twice in test_math; combine the definitions
author Mark Dickinson <dickinsm@gmail.com>
date Sat, 06 Feb 2010 23:11:25 +0000
parents c67b23397f30
children fd25030223b0 94f64f11fdd0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 ---------------------------------------------------------------------
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3 / Copyright (c) 1996. \
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4 | The Regents of the University of California. |
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5 | All rights reserved. |
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6 | |
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7 | Permission to use, copy, modify, and distribute this software for |
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8 | any purpose without fee is hereby granted, provided that this en- |
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9 | tire notice is included in all copies of any software which is or |
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10 | includes a copy or modification of this software and in all |
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11 | copies of the supporting documentation for such software. |
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12 | |
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13 | This work was produced at the University of California, Lawrence |
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14 | Livermore National Laboratory under contract no. W-7405-ENG-48 |
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15 | between the U.S. Department of Energy and The Regents of the |
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16 | University of California for the operation of UC LLNL. |
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17 | |
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18 | DISCLAIMER |
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19 | |
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20 | This software was prepared as an account of work sponsored by an |
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21 | agency of the United States Government. Neither the United States |
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22 | Government nor the University of California nor any of their em- |
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23 | ployees, makes any warranty, express or implied, or assumes any |
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24 | liability or responsibility for the accuracy, completeness, or |
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25 | usefulness of any information, apparatus, product, or process |
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26 | disclosed, or represents that its use would not infringe |
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27 | privately-owned rights. Reference herein to any specific commer- |
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28 | cial products, process, or service by trade name, trademark, |
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29 | manufacturer, or otherwise, does not necessarily constitute or |
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30 | imply its endorsement, recommendation, or favoring by the United |
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31 | States Government or the University of California. The views and |
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32 | opinions of authors expressed herein do not necessarily state or |
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33 | reflect those of the United States Government or the University |
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34 | of California, and shall not be used for advertising or product |
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35 \ endorsement purposes. /
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36 ---------------------------------------------------------------------
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37 */
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38
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39 /*
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40 Floating point exception control module.
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41
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42 This Python module provides bare-bones control over floating point
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43 units from several hardware manufacturers. Specifically, it allows
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44 the user to turn on the generation of SIGFPE whenever any of the
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45 three serious IEEE 754 exceptions (Division by Zero, Overflow,
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46 Invalid Operation) occurs. We currently ignore Underflow and
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47 Inexact Result exceptions, although those could certainly be added
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48 if desired.
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49
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50 The module also establishes a signal handler for SIGFPE during
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51 initialization. This builds on code found in the Python
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52 distribution at Include/pyfpe.h and Python/pyfpe.c. If those files
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53 are not in your Python distribution, find them in a patch at
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54 ftp://icf.llnl.gov/pub/python/busby/patches.961108.tgz.
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55
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56 This module is only useful to you if it happens to include code
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57 specific for your hardware and software environment. If you can
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58 contribute OS-specific code for new platforms, or corrections for
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59 the code provided, it will be greatly appreciated.
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60
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61 ** Version 1.0: September 20, 1996. Lee Busby, LLNL.
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62 */
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63
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64 #ifdef __cplusplus
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65 extern "C" {
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66 #endif
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67
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68 #include "Python.h"
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69 #include <signal.h>
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70
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71 #if defined(__FreeBSD__)
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72 # include <ieeefp.h>
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73 #elif defined(__VMS)
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74 #define __NEW_STARLET
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75 #include <starlet.h>
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76 #include <ieeedef.h>
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77 #endif
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78
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79 #ifndef WANT_SIGFPE_HANDLER
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80 /* Define locally if they are not defined in Python. This gives only
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81 * the limited control to induce a core dump in case of an exception.
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82 */
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83 #include <setjmp.h>
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84 static jmp_buf PyFPE_jbuf;
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85 static int PyFPE_counter = 0;
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86 #endif
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87
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88 typedef void Sigfunc(int);
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89 static Sigfunc sigfpe_handler;
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90 static void fpe_reset(Sigfunc *);
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91
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92 static PyObject *fpe_error;
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93 PyMODINIT_FUNC initfpectl(void);
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94 static PyObject *turnon_sigfpe (PyObject *self,PyObject *args);
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95 static PyObject *turnoff_sigfpe (PyObject *self,PyObject *args);
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96
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97 static PyMethodDef fpectl_methods[] = {
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98 {"turnon_sigfpe", (PyCFunction) turnon_sigfpe, METH_VARARGS},
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99 {"turnoff_sigfpe", (PyCFunction) turnoff_sigfpe, METH_VARARGS},
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100 {0,0}
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101 };
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102
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103 static PyObject *turnon_sigfpe(PyObject *self,PyObject *args)
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104 {
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105 /* Do any architecture-specific one-time only initialization here. */
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106
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107 fpe_reset(sigfpe_handler);
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108 Py_INCREF (Py_None);
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109 return Py_None;
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110 }
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111
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112 static void fpe_reset(Sigfunc *handler)
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113 {
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114 /* Reset the exception handling machinery, and reset the signal
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115 * handler for SIGFPE to the given handler.
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116 */
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117
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118 /*-- IRIX -----------------------------------------------------------------*/
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119 #if defined(sgi)
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120 /* See man page on handle_sigfpes -- must link with -lfpe
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121 * My usage doesn't follow the man page exactly. Maybe somebody
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122 * else can explain handle_sigfpes to me....
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123 * cc -c -I/usr/local/python/include fpectlmodule.c
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124 * ld -shared -o fpectlmodule.so fpectlmodule.o -lfpe
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125 */
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126 #include <sigfpe.h>
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127 typedef void user_routine (unsigned[5], int[2]);
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128 typedef void abort_routine (unsigned long);
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129 handle_sigfpes(_OFF, 0,
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130 (user_routine *)0,
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131 _TURN_OFF_HANDLER_ON_ERROR,
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132 NULL);
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133 handle_sigfpes(_ON, _EN_OVERFL | _EN_DIVZERO | _EN_INVALID,
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134 (user_routine *)0,
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135 _ABORT_ON_ERROR,
5380
2d4c6cba01bf Keep gcc -Wall happy.
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diff changeset
136 NULL);
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137 PyOS_setsig(SIGFPE, handler);
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138
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139 /*-- SunOS and Solaris ----------------------------------------------------*/
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140 #elif defined(sun)
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141 /* References: ieee_handler, ieee_sun, ieee_functions, and ieee_flags
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142 man pages (SunOS or Solaris)
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143 cc -c -I/usr/local/python/include fpectlmodule.c
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144 ld -G -o fpectlmodule.so -L/opt/SUNWspro/lib fpectlmodule.o -lsunmath -lm
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145 */
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146 #include <math.h>
17009
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147 #ifndef _SUNMATH_H
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148 extern void nonstandard_arithmetic(void);
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149 extern int ieee_flags(const char*, const char*, const char*, char **);
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150 extern long ieee_handler(const char*, const char*, sigfpe_handler_type);
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151 #endif
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152
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153 char *mode="exception", *in="all", *out;
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154 (void) nonstandard_arithmetic();
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155 (void) ieee_flags("clearall",mode,in,&out);
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156 (void) ieee_handler("set","common",(sigfpe_handler_type)handler);
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157 PyOS_setsig(SIGFPE, handler);
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158
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159 /*-- HPUX -----------------------------------------------------------------*/
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160 #elif defined(__hppa) || defined(hppa)
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161 /* References: fpsetmask man page */
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162 /* cc -Aa +z -c -I/usr/local/python/include fpectlmodule.c */
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163 /* ld -b -o fpectlmodule.sl fpectlmodule.o -lm */
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164 #include <math.h>
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165 fpsetdefaults();
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166 PyOS_setsig(SIGFPE, handler);
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167
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168 /*-- IBM AIX --------------------------------------------------------------*/
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169 #elif defined(__AIX) || defined(_AIX)
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170 /* References: fp_trap, fp_enable man pages */
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171 #include <fptrap.h>
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172 fp_trap(FP_TRAP_SYNC);
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173 fp_enable(TRP_INVALID | TRP_DIV_BY_ZERO | TRP_OVERFLOW);
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174 PyOS_setsig(SIGFPE, handler);
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175
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176 /*-- DEC ALPHA OSF --------------------------------------------------------*/
10617
012d361fdf23 Avoid triggering Alpha OSF/1 specific code on Alpha NT or Linux.
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177 #elif defined(__alpha) && defined(__osf__)
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178 /* References: exception_intro, ieee man pages */
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179 /* cc -c -I/usr/local/python/include fpectlmodule.c */
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180 /* ld -shared -o fpectlmodule.so fpectlmodule.o */
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181 #include <machine/fpu.h>
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182 unsigned long fp_control =
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183 IEEE_TRAP_ENABLE_INV | IEEE_TRAP_ENABLE_DZE | IEEE_TRAP_ENABLE_OVF;
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184 ieee_set_fp_control(fp_control);
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185 PyOS_setsig(SIGFPE, handler);
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186
25445
db5f1db7b34e Patch for the DEC Alpha under Linux, by Lee Busby.
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187 /*-- DEC ALPHA LINUX ------------------------------------------------------*/
db5f1db7b34e Patch for the DEC Alpha under Linux, by Lee Busby.
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188 #elif defined(__alpha) && defined(linux)
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Guido van Rossum <guido@python.org>
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189 #include <asm/fpu.h>
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190 unsigned long fp_control =
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diff changeset
191 IEEE_TRAP_ENABLE_INV | IEEE_TRAP_ENABLE_DZE | IEEE_TRAP_ENABLE_OVF;
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parents: 24471
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192 ieee_set_fp_control(fp_control);
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193 PyOS_setsig(SIGFPE, handler);
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194
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ac487a7f7f2c Patch #708495: Port more stuff to OpenVMS.
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195 /*-- DEC ALPHA VMS --------------------------------------------------------*/
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196 #elif defined(__ALPHA) && defined(__VMS)
39043
c67b23397f30 Patch #1516912: improve Modules support for OpenVMS.
Neal Norwitz <nnorwitz@gmail.com>
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197 IEEE clrmsk;
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Neal Norwitz <nnorwitz@gmail.com>
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198 IEEE setmsk;
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Neal Norwitz <nnorwitz@gmail.com>
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diff changeset
199 clrmsk.ieee$q_flags =
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200 IEEE$M_TRAP_ENABLE_UNF | IEEE$M_TRAP_ENABLE_INE |
c67b23397f30 Patch #1516912: improve Modules support for OpenVMS.
Neal Norwitz <nnorwitz@gmail.com>
parents: 36324
diff changeset
201 IEEE$M_MAP_UMZ;
c67b23397f30 Patch #1516912: improve Modules support for OpenVMS.
Neal Norwitz <nnorwitz@gmail.com>
parents: 36324
diff changeset
202 setmsk.ieee$q_flags =
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Neal Norwitz <nnorwitz@gmail.com>
parents: 36324
diff changeset
203 IEEE$M_TRAP_ENABLE_INV | IEEE$M_TRAP_ENABLE_DZE |
c67b23397f30 Patch #1516912: improve Modules support for OpenVMS.
Neal Norwitz <nnorwitz@gmail.com>
parents: 36324
diff changeset
204 IEEE$M_TRAP_ENABLE_OVF;
c67b23397f30 Patch #1516912: improve Modules support for OpenVMS.
Neal Norwitz <nnorwitz@gmail.com>
parents: 36324
diff changeset
205 sys$ieee_set_fp_control(&clrmsk, &setmsk, 0);
c67b23397f30 Patch #1516912: improve Modules support for OpenVMS.
Neal Norwitz <nnorwitz@gmail.com>
parents: 36324
diff changeset
206 PyOS_setsig(SIGFPE, handler);
c67b23397f30 Patch #1516912: improve Modules support for OpenVMS.
Neal Norwitz <nnorwitz@gmail.com>
parents: 36324
diff changeset
207
c67b23397f30 Patch #1516912: improve Modules support for OpenVMS.
Neal Norwitz <nnorwitz@gmail.com>
parents: 36324
diff changeset
208 /*-- HP IA64 VMS --------------------------------------------------------*/
c67b23397f30 Patch #1516912: improve Modules support for OpenVMS.
Neal Norwitz <nnorwitz@gmail.com>
parents: 36324
diff changeset
209 #elif defined(__ia64) && defined(__VMS)
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210 PyOS_setsig(SIGFPE, handler);
ac487a7f7f2c Patch #708495: Port more stuff to OpenVMS.
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diff changeset
211
5120
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212 /*-- Cray Unicos ----------------------------------------------------------*/
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213 #elif defined(cray)
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214 /* UNICOS delivers SIGFPE by default, but no matherr */
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parents:
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215 #ifdef HAS_LIBMSET
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
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parents:
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216 libmset(-1);
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
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parents:
diff changeset
217 #endif
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diff changeset
218 PyOS_setsig(SIGFPE, handler);
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219
14683
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Guido van Rossum <guido@python.org>
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diff changeset
220 /*-- FreeBSD ----------------------------------------------------------------*/
edf1e15c671a Randall Hopper: Add fpectl functionality patch for FreeBSD.
Guido van Rossum <guido@python.org>
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diff changeset
221 #elif defined(__FreeBSD__)
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diff changeset
222 fpresetsticky(fpgetsticky());
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diff changeset
223 fpsetmask(FP_X_INV | FP_X_DZ | FP_X_OFL);
870237089ba2 Use PyOS_setsig() instead of signal(). Also remove redundant spaces
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224 PyOS_setsig(SIGFPE, handler);
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225
5120
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226 /*-- Linux ----------------------------------------------------------------*/
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227 #elif defined(linux)
6855
1ab307951f4e Patch by Oliver Andrich for Lunix using glibc.
Guido van Rossum <guido@python.org>
parents: 6507
diff changeset
228 #ifdef __GLIBC__
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diff changeset
229 #include <fpu_control.h>
1ab307951f4e Patch by Oliver Andrich for Lunix using glibc.
Guido van Rossum <guido@python.org>
parents: 6507
diff changeset
230 #else
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a00073f2e087 Some patches to Lee Busby's fpectl mods that accidentally didn't make it
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parents: 6367
diff changeset
231 #include <i386/fpu_control.h>
6855
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parents: 6507
diff changeset
232 #endif
15713
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Andrew M. Kuchling <amk@amk.ca>
parents: 14719
diff changeset
233 #ifdef _FPU_SETCW
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diff changeset
234 {
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Andrew M. Kuchling <amk@amk.ca>
parents: 14719
diff changeset
235 fpu_control_t cw = 0x1372;
3693abd0eac1 Patch #103012: Update fpectlmodule for current glibc;
Andrew M. Kuchling <amk@amk.ca>
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diff changeset
236 _FPU_SETCW(cw);
3693abd0eac1 Patch #103012: Update fpectlmodule for current glibc;
Andrew M. Kuchling <amk@amk.ca>
parents: 14719
diff changeset
237 }
3693abd0eac1 Patch #103012: Update fpectlmodule for current glibc;
Andrew M. Kuchling <amk@amk.ca>
parents: 14719
diff changeset
238 #else
6507
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parents: 6367
diff changeset
239 __setfpucw(0x1372);
15713
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Andrew M. Kuchling <amk@amk.ca>
parents: 14719
diff changeset
240 #endif
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diff changeset
241 PyOS_setsig(SIGFPE, handler);
5120
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242
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
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diff changeset
243 /*-- Microsoft Windows, NT ------------------------------------------------*/
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
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parents:
diff changeset
244 #elif defined(_MSC_VER)
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
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parents:
diff changeset
245 /* Reference: Visual C++ Books Online 4.2,
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
Guido van Rossum <guido@python.org>
parents:
diff changeset
246 Run-Time Library Reference, _control87, _controlfp */
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
Guido van Rossum <guido@python.org>
parents:
diff changeset
247 #include <float.h>
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
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diff changeset
248 unsigned int cw = _EM_INVALID | _EM_ZERODIVIDE | _EM_OVERFLOW;
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
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parents:
diff changeset
249 (void)_controlfp(0, cw);
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diff changeset
250 PyOS_setsig(SIGFPE, handler);
5120
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parents:
diff changeset
251
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
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parents:
diff changeset
252 /*-- Give Up --------------------------------------------------------------*/
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
Guido van Rossum <guido@python.org>
parents:
diff changeset
253 #else
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
Guido van Rossum <guido@python.org>
parents:
diff changeset
254 fputs("Operation not implemented\n", stderr);
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
Guido van Rossum <guido@python.org>
parents:
diff changeset
255 #endif
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
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parents:
diff changeset
256
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
Guido van Rossum <guido@python.org>
parents:
diff changeset
257 }
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
Guido van Rossum <guido@python.org>
parents:
diff changeset
258
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
Guido van Rossum <guido@python.org>
parents:
diff changeset
259 static PyObject *turnoff_sigfpe(PyObject *self,PyObject *args)
a48f3678f9e1 Changes for Lee Busby's SIGFPE patch set.
Guido van Rossum <guido@python.org>
parents:
diff changeset
260 {
14683
edf1e15c671a Randall Hopper: Add fpectl functionality patch for FreeBSD.
Guido van Rossum <guido@python.org>
parents: 13676
diff changeset
261 #ifdef __FreeBSD__
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parents: 14683
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262 fpresetsticky(fpgetsticky());
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263 fpsetmask(0);
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264 #elif defined(__VMS)
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265 IEEE clrmsk;
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266 clrmsk.ieee$q_flags =
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267 IEEE$M_TRAP_ENABLE_UNF | IEEE$M_TRAP_ENABLE_INE |
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268 IEEE$M_MAP_UMZ | IEEE$M_TRAP_ENABLE_INV |
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269 IEEE$M_TRAP_ENABLE_DZE | IEEE$M_TRAP_ENABLE_OVF |
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270 IEEE$M_INHERIT;
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271 sys$ieee_set_fp_control(&clrmsk, 0, 0);
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272 #else
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273 fputs("Operation not implemented\n", stderr);
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274 #endif
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275 Py_INCREF(Py_None);
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276 return Py_None;
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277 }
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278
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279 static void sigfpe_handler(int signo)
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280 {
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281 fpe_reset(sigfpe_handler);
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282 if(PyFPE_counter) {
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283 longjmp(PyFPE_jbuf, 1);
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284 } else {
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285 Py_FatalError("Unprotected floating point exception");
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286 }
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287 }
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288
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289 PyMODINIT_FUNC initfpectl(void)
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290 {
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291 PyObject *m, *d;
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292 m = Py_InitModule("fpectl", fpectl_methods);
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293 if (m == NULL)
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294 return;
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295 d = PyModule_GetDict(m);
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296 fpe_error = PyErr_NewException("fpectl.error", NULL, NULL);
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297 if (fpe_error != NULL)
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298 PyDict_SetItemString(d, "error", fpe_error);
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299 }
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300
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301 #ifdef __cplusplus
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302 }
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303 #endif