Mercurial > cpython-lru_cache-weakref

annotate Modules/fpectlmodule.c @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 2d4c6cba01bf
children 2c29b8982643
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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 #ifndef WANT_SIGFPE_HANDLER
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72 /* Define locally if they are not defined in Python. This gives only
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73 * the limited control to induce a core dump in case of an exception.
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74 */
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75 #include <setjmp.h>
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76 static jmp_buf PyFPE_jbuf;
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77 static int PyFPE_counter = 0;
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78 #endif
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79
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80 typedef RETSIGTYPE Sigfunc(int);
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81 static Sigfunc sigfpe_handler;
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82 static void fpe_reset(Sigfunc *);
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83
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84 static PyObject *fpe_error;
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85 void initfpectl(void);
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86 static PyObject *turnon_sigfpe (PyObject *self,PyObject *args);
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87 static PyObject *turnoff_sigfpe (PyObject *self,PyObject *args);
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88
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89 static PyMethodDef fpectl_methods[] = {
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90 {"turnon_sigfpe", (PyCFunction) turnon_sigfpe, 1},
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91 {"turnoff_sigfpe", (PyCFunction) turnoff_sigfpe, 1},
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92 {0,0}
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93 };
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94
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95 static PyObject *turnon_sigfpe(PyObject *self,PyObject *args)
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96 {
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97 /* Do any architecture-specific one-time only initialization here. */
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98
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99 fpe_reset(sigfpe_handler);
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100 Py_INCREF (Py_None);
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101 return Py_None;
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102 }
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103
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104 static void fpe_reset(Sigfunc *handler)
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105 {
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106 /* Reset the exception handling machinery, and reset the signal
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107 * handler for SIGFPE to the given handler.
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108 */
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109
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110 /*-- IRIX -----------------------------------------------------------------*/
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111 #if defined(sgi)
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112 /* See man page on handle_sigfpes -- must link with -lfpe
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113 * My usage doesn't follow the man page exactly. Maybe somebody
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114 * else can explain handle_sigfpes to me....
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115 * cc -c -I/usr/local/python/include fpectlmodule.c
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116 * ld -shared -o fpectlmodule.so fpectlmodule.o -lfpe
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117 */
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118 #include <sigfpe.h>
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119 typedef void user_routine (unsigned[5], int[2]);
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120 typedef void abort_routine (unsigned long);
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121 handle_sigfpes(_OFF, 0,
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122 (user_routine *)0,
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123 _TURN_OFF_HANDLER_ON_ERROR,
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124 NULL);
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125 handle_sigfpes(_ON, _EN_OVERFL | _EN_DIVZERO | _EN_INVALID,
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126 (user_routine *)0,
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127 _ABORT_ON_ERROR,
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128 NULL);
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129 signal(SIGFPE, handler);
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130
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131 /*-- SunOS and Solaris ----------------------------------------------------*/
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132 #elif defined(sun)
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133 /* References: ieee_handler, ieee_sun, ieee_functions, and ieee_flags
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134 man pages (SunOS or Solaris)
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135 cc -c -I/usr/local/python/include fpectlmodule.c
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136 ld -G -o fpectlmodule.so -L/opt/SUNWspro/lib fpectlmodule.o -lsunmath -lm
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137 */
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138 #include <math.h>
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139 char *mode="exception", *in="all", *out;
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140 (void) nonstandard_arithmetic();
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141 (void) ieee_flags("clearall",mode,in,&out);
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142 (void) ieee_handler("set","common",(sigfpe_handler_type)handler);
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143 signal(SIGFPE, handler);
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144
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145 /*-- HPUX -----------------------------------------------------------------*/
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146 #elif defined(__hppa) || defined(hppa)
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147 /* References: fpsetmask man page */
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148 /* cc -Aa +z -c -I/usr/local/python/include fpectlmodule.c */
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149 /* ld -b -o fpectlmodule.sl fpectlmodule.o -lm */
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150 #include <math.h>
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151 fpsetdefaults();
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152 signal(SIGFPE, handler);
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153
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154 /*-- IBM AIX --------------------------------------------------------------*/
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155 #elif defined(__AIX) || defined(_AIX)
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156 /* References: fp_trap, fp_enable man pages */
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157 #include <fptrap.h>
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158 fp_trap(FP_TRAP_SYNC);
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159 fp_enable(TRP_INVALID | TRP_DIV_BY_ZERO | TRP_OVERFLOW);
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160 signal(SIGFPE, handler);
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161
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162 /*-- DEC ALPHA OSF --------------------------------------------------------*/
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163 #elif defined(__alpha)
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164 /* References: exception_intro, ieee man pages */
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165 /* cc -c -I/usr/local/python/include fpectlmodule.c */
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166 /* ld -shared -o fpectlmodule.so fpectlmodule.o */
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167 #include <machine/fpu.h>
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168 unsigned long fp_control =
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169 IEEE_TRAP_ENABLE_INV | IEEE_TRAP_ENABLE_DZE | IEEE_TRAP_ENABLE_OVF;
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170 ieee_set_fp_control(fp_control);
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171 signal(SIGFPE, handler);
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172
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173 /*-- Cray Unicos ----------------------------------------------------------*/
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174 #elif defined(cray)
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175 /* UNICOS delivers SIGFPE by default, but no matherr */
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176 #ifdef HAS_LIBMSET
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177 libmset(-1);
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178 #endif
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179 signal(SIGFPE, handler);
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180
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181 /*-- Linux ----------------------------------------------------------------*/
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182 #elif defined(linux)
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183 /* Linux delivers SIGFPE by default,
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184 except for log(0), atanh(-1), 0.^0.
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185 */
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186 signal(SIGFPE, handler);
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187
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188 /*-- NeXT -----------------------------------------------------------------*/
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189 #elif defined(NeXT) && defined(m68k) && defined(__GNUC__)
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190 /* NeXT needs explicit csr set to generate SIGFPE */
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191 asm("fmovel #0x1400,fpcr"); /* set OVFL and ZD bits */
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192 signal(SIGFPE, handler);
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193
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194 /*-- Microsoft Windows, NT ------------------------------------------------*/
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195 #elif defined(_MSC_VER)
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196 /* Reference: Visual C++ Books Online 4.2,
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197 Run-Time Library Reference, _control87, _controlfp */
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198 #include <float.h>
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199 unsigned int cw = _EM_INVALID | _EM_ZERODIVIDE | _EM_OVERFLOW;
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200 (void)_controlfp(0, cw);
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201 signal(SIGFPE, handler);
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202
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203 /*-- Give Up --------------------------------------------------------------*/
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204 #else
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205 fputs("Operation not implemented\n", stderr);
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206 #endif
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207
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208 }
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209
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210 static PyObject *turnoff_sigfpe(PyObject *self,PyObject *args)
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211 {
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212 fputs("Operation not implemented\n", stderr);
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213 Py_INCREF (Py_None);
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214 return Py_None;
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215 }
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216
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217 static void sigfpe_handler(int signo)
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218 {
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219 fpe_reset(sigfpe_handler);
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220 if(PyFPE_counter) {
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221 longjmp(PyFPE_jbuf, 1);
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222 } else {
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223 Py_FatalError("Unprotected floating point exception");
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224 }
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225 }
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226
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227 void initfpectl(void)
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228 {
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229 PyObject *m, *d;
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230 static int already_initialized = 0;
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231
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232 if (already_initialized) return;
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233 m = Py_InitModule("fpectl", fpectl_methods);
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234 d = PyModule_GetDict(m);
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235 fpe_error = PyString_FromString("fpectl.error");
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236 PyDict_SetItemString(d, "error", fpe_error);
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237
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238 if (PyErr_Occurred())
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239 Py_FatalError("Cannot initialize module fpectl");
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240 already_initialized = 1;
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241 }
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242
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243 #ifdef __cplusplus
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244 }
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245 #endif