diff --git a/Doc/library/exceptions.rst b/Doc/library/exceptions.rst index a6b20a5ac95..c8d32cff4e0 100644 --- a/Doc/library/exceptions.rst +++ b/Doc/library/exceptions.rst @@ -154,10 +154,7 @@ The following exceptions are the exceptions that are usually raised. .. exception:: FloatingPointError - Raised when a floating point operation fails. This exception is always defined, - but can only be raised when Python is configured with the - ``--with-fpectl`` option, or the :const:`WANT_SIGFPE_HANDLER` symbol is - defined in the :file:`pyconfig.h` file. + Not currently used. .. exception:: GeneratorExit diff --git a/Doc/library/fpectl.rst b/Doc/library/fpectl.rst deleted file mode 100644 index 96607165ba4..00000000000 --- a/Doc/library/fpectl.rst +++ /dev/null @@ -1,121 +0,0 @@ -:mod:`fpectl` --- Floating point exception control -================================================== - -.. module:: fpectl - :platform: Unix - :synopsis: Provide control for floating point exception handling. - -.. moduleauthor:: Lee Busby -.. sectionauthor:: Lee Busby - -.. note:: - - The :mod:`fpectl` module is not built by default, and its usage is discouraged - and may be dangerous except in the hands of experts. See also the section - :ref:`fpectl-limitations` on limitations for more details. - -.. index:: single: IEEE-754 - --------------- - -Most computers carry out floating point operations in conformance with the -so-called IEEE-754 standard. On any real computer, some floating point -operations produce results that cannot be expressed as a normal floating point -value. For example, try :: - - >>> import math - >>> math.exp(1000) - inf - >>> math.exp(1000) / math.exp(1000) - nan - -(The example above will work on many platforms. DEC Alpha may be one exception.) -"Inf" is a special, non-numeric value in IEEE-754 that stands for "infinity", -and "nan" means "not a number." Note that, other than the non-numeric results, -nothing special happened when you asked Python to carry out those calculations. -That is in fact the default behaviour prescribed in the IEEE-754 standard, and -if it works for you, stop reading now. - -In some circumstances, it would be better to raise an exception and stop -processing at the point where the faulty operation was attempted. The -:mod:`fpectl` module is for use in that situation. It provides control over -floating point units from several hardware manufacturers, allowing the user to -turn on the generation of :const:`SIGFPE` whenever any of the IEEE-754 -exceptions Division by Zero, Overflow, or Invalid Operation occurs. In tandem -with a pair of wrapper macros that are inserted into the C code comprising your -python system, :const:`SIGFPE` is trapped and converted into the Python -:exc:`FloatingPointError` exception. - -The :mod:`fpectl` module defines the following functions and may raise the given -exception: - - -.. function:: turnon_sigfpe() - - Turn on the generation of :const:`SIGFPE`, and set up an appropriate signal - handler. - - -.. function:: turnoff_sigfpe() - - Reset default handling of floating point exceptions. - - -.. exception:: FloatingPointError - - After :func:`turnon_sigfpe` has been executed, a floating point operation that - raises one of the IEEE-754 exceptions Division by Zero, Overflow, or Invalid - operation will in turn raise this standard Python exception. - - -.. _fpectl-example: - -Example -------- - -The following example demonstrates how to start up and test operation of the -:mod:`fpectl` module. :: - - >>> import fpectl - >>> import fpetest - >>> fpectl.turnon_sigfpe() - >>> fpetest.test() - overflow PASS - FloatingPointError: Overflow - - div by 0 PASS - FloatingPointError: Division by zero - [ more output from test elided ] - >>> import math - >>> math.exp(1000) - Traceback (most recent call last): - File "", line 1, in - FloatingPointError: in math_1 - - -.. _fpectl-limitations: - -Limitations and other considerations ------------------------------------- - -Setting up a given processor to trap IEEE-754 floating point errors currently -requires custom code on a per-architecture basis. You may have to modify -:mod:`fpectl` to control your particular hardware. - -Conversion of an IEEE-754 exception to a Python exception requires that the -wrapper macros ``PyFPE_START_PROTECT`` and ``PyFPE_END_PROTECT`` be inserted -into your code in an appropriate fashion. Python itself has been modified to -support the :mod:`fpectl` module, but many other codes of interest to numerical -analysts have not. - -The :mod:`fpectl` module is not thread-safe. - - -.. seealso:: - - Some files in the source distribution may be interesting in learning more about - how this module operates. The include file :file:`Include/pyfpe.h` discusses the - implementation of this module at some length. :file:`Modules/fpetestmodule.c` - gives several examples of use. Many additional examples can be found in - :file:`Objects/floatobject.c`. - diff --git a/Doc/library/python.rst b/Doc/library/python.rst index f307d7db6db..440dc6632b8 100644 --- a/Doc/library/python.rst +++ b/Doc/library/python.rst @@ -24,4 +24,3 @@ overview: gc.rst inspect.rst site.rst - fpectl.rst diff --git a/Doc/license.rst b/Doc/license.rst index aa4b1450e91..5f78240002f 100644 --- a/Doc/license.rst +++ b/Doc/license.rst @@ -349,48 +349,6 @@ Project, http://www.wide.ad.jp/. :: SUCH DAMAGE. -Floating point exception control --------------------------------- - -The source for the :mod:`fpectl` module includes the following notice:: - - --------------------------------------------------------------------- - / 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. / - --------------------------------------------------------------------- - - Asynchronous socket services ---------------------------- diff --git a/Include/pyfpe.h b/Include/pyfpe.h index d86cb7486ce..5a99e397931 100644 --- a/Include/pyfpe.h +++ b/Include/pyfpe.h @@ -1,176 +1,12 @@ #ifndef Py_PYFPE_H #define Py_PYFPE_H -#ifdef __cplusplus -extern "C" { -#endif -/* - --------------------------------------------------------------------- - / 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. / - --------------------------------------------------------------------- -*/ -/* - * Define macros for handling SIGFPE. - * Lee Busby, LLNL, November, 1996 - * busby1@llnl.gov - * - ********************************************* - * Overview of the system for handling SIGFPE: - * - * This file (Include/pyfpe.h) defines a couple of "wrapper" macros for - * insertion into your Python C code of choice. Their proper use is - * discussed below. The file Python/pyfpe.c defines a pair of global - * variables PyFPE_jbuf and PyFPE_counter which are used by the signal - * handler for SIGFPE to decide if a particular exception was protected - * by the macros. The signal handler itself, and code for enabling the - * generation of SIGFPE in the first place, is in a (new) Python module - * named fpectl. This module is standard in every respect. It can be loaded - * either statically or dynamically as you choose, and like any other - * Python module, has no effect until you import it. - * - * In the general case, there are three steps toward handling SIGFPE in any - * Python code: - * - * 1) Add the *_PROTECT macros to your C code as required to protect - * dangerous floating point sections. - * - * 2) Turn on the inclusion of the code by adding the ``--with-fpectl'' - * flag at the time you run configure. If the fpectl or other modules - * which use the *_PROTECT macros are to be dynamically loaded, be - * sure they are compiled with WANT_SIGFPE_HANDLER defined. - * - * 3) When python is built and running, import fpectl, and execute - * fpectl.turnon_sigfpe(). This sets up the signal handler and enables - * generation of SIGFPE whenever an exception occurs. From this point - * on, any properly trapped SIGFPE should result in the Python - * FloatingPointError exception. - * - * Step 1 has been done already for the Python kernel code, and should be - * done soon for the NumPy array package. Step 2 is usually done once at - * python install time. Python's behavior with respect to SIGFPE is not - * changed unless you also do step 3. Thus you can control this new - * facility at compile time, or run time, or both. - * - ******************************** - * Using the macros in your code: - * - * static PyObject *foobar(PyObject *self,PyObject *args) - * { - * .... - * PyFPE_START_PROTECT("Error in foobar", return 0) - * result = dangerous_op(somearg1, somearg2, ...); - * PyFPE_END_PROTECT(result) - * .... - * } - * - * If a floating point error occurs in dangerous_op, foobar returns 0 (NULL), - * after setting the associated value of the FloatingPointError exception to - * "Error in foobar". ``Dangerous_op'' can be a single operation, or a block - * of code, function calls, or any combination, so long as no alternate - * return is possible before the PyFPE_END_PROTECT macro is reached. - * - * The macros can only be used in a function context where an error return - * can be recognized as signaling a Python exception. (Generally, most - * functions that return a PyObject * will qualify.) - * - * Guido's original design suggestion for PyFPE_START_PROTECT and - * PyFPE_END_PROTECT had them open and close a local block, with a locally - * defined jmp_buf and jmp_buf pointer. This would allow recursive nesting - * of the macros. The Ansi C standard makes it clear that such local - * variables need to be declared with the "volatile" type qualifier to keep - * setjmp from corrupting their values. Some current implementations seem - * to be more restrictive. For example, the HPUX man page for setjmp says - * - * Upon the return from a setjmp() call caused by a longjmp(), the - * values of any non-static local variables belonging to the routine - * from which setjmp() was called are undefined. Code which depends on - * such values is not guaranteed to be portable. - * - * I therefore decided on a more limited form of nesting, using a counter - * variable (PyFPE_counter) to keep track of any recursion. If an exception - * occurs in an ``inner'' pair of macros, the return will apparently - * come from the outermost level. - * +/* These macros used to do something when Python was built with --with-fpectl, + * but support for that was dropped in 3.7. We continue to define them though, + * to avoid breaking API users. */ -#ifdef WANT_SIGFPE_HANDLER -#include -#include -#include -extern jmp_buf PyFPE_jbuf; -extern int PyFPE_counter; -extern double PyFPE_dummy(void *); - -#define PyFPE_START_PROTECT(err_string, leave_stmt) \ -if (!PyFPE_counter++ && setjmp(PyFPE_jbuf)) { \ - PyErr_SetString(PyExc_FloatingPointError, err_string); \ - PyFPE_counter = 0; \ - leave_stmt; \ -} - -/* - * This (following) is a heck of a way to decrement a counter. However, - * unless the macro argument is provided, code optimizers will sometimes move - * this statement so that it gets executed *before* the unsafe expression - * which we're trying to protect. That pretty well messes things up, - * of course. - * - * If the expression(s) you're trying to protect don't happen to return a - * value, you will need to manufacture a dummy result just to preserve the - * correct ordering of statements. Note that the macro passes the address - * of its argument (so you need to give it something which is addressable). - * If your expression returns multiple results, pass the last such result - * to PyFPE_END_PROTECT. - * - * Note that PyFPE_dummy returns a double, which is cast to int. - * This seeming insanity is to tickle the Floating Point Unit (FPU). - * If an exception has occurred in a preceding floating point operation, - * some architectures (notably Intel 80x86) will not deliver the interrupt - * until the *next* floating point operation. This is painful if you've - * already decremented PyFPE_counter. - */ -#define PyFPE_END_PROTECT(v) PyFPE_counter -= (int)PyFPE_dummy(&(v)); - -#else - #define PyFPE_START_PROTECT(err_string, leave_stmt) #define PyFPE_END_PROTECT(v) -#endif - -#ifdef __cplusplus -} -#endif #endif /* !Py_PYFPE_H */ diff --git a/Misc/NEWS.d/next/Library/2017-12-10-21-19-14.bpo-29137.CFcON1.rst b/Misc/NEWS.d/next/Library/2017-12-10-21-19-14.bpo-29137.CFcON1.rst new file mode 100644 index 00000000000..85f3df5c8f5 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2017-12-10-21-19-14.bpo-29137.CFcON1.rst @@ -0,0 +1,3 @@ +The ``fpectl`` library has been removed. It was never enabled by default, +never worked correctly on x86-64, and it changed the Python ABI in ways that +caused unexpected breakage of C extensions. diff --git a/Modules/Setup.dist b/Modules/Setup.dist index 9c3e1bed30c..1f2d56c0655 100644 --- a/Modules/Setup.dist +++ b/Modules/Setup.dist @@ -334,20 +334,6 @@ _symtable symtablemodule.c #parser parsermodule.c -# Lee Busby's SIGFPE modules. -# The library to link fpectl with is platform specific. -# Choose *one* of the options below for fpectl: - -# For Solaris with SunPro compiler (tested on Solaris 2.5 with SunPro C 4.2): -# (Without the compiler you don't have -lsunmath.) -#fpectl fpectlmodule.c -R/opt/SUNWspro/lib -lsunmath -lm - -# For other systems: see instructions in fpectlmodule.c. -#fpectl fpectlmodule.c ... - -# Test module for fpectl. No extra libraries needed. -#fpetest fpetestmodule.c - # Andrew Kuchling's zlib module. # This require zlib 1.1.3 (or later). # See http://www.gzip.org/zlib/ diff --git a/Modules/fpectlmodule.c b/Modules/fpectlmodule.c deleted file mode 100644 index 42ef0f6072e..00000000000 --- a/Modules/fpectlmodule.c +++ /dev/null @@ -1,255 +0,0 @@ -/* - --------------------------------------------------------------------- - / 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 - -#if defined(__FreeBSD__) -# include -#endif - -#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. - */ -#include -static jmp_buf PyFPE_jbuf; -static int PyFPE_counter = 0; -#endif - -typedef void Sigfunc(int); -static Sigfunc sigfpe_handler; -static void fpe_reset(Sigfunc *); - -static PyObject *fpe_error; - -PyMODINIT_FUNC PyInit_fpectl(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, METH_VARARGS}, - {"turnoff_sigfpe", (PyCFunction) turnoff_sigfpe, METH_VARARGS}, - {0,0} -}; - -static PyObject *turnon_sigfpe(PyObject *self,PyObject *args) -{ - /* Do any architecture-specific one-time only initialization here. */ - - fpe_reset(sigfpe_handler); - Py_RETURN_NONE; -} - -static void fpe_reset(Sigfunc *handler) -{ - /* Reset the exception handling machinery, and reset the signal - * handler for SIGFPE to the given handler. - */ - -/*-- SunOS and Solaris ----------------------------------------------------*/ -#if 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 -#ifndef _SUNMATH_H - extern void nonstandard_arithmetic(void); - extern int ieee_flags(const char*, const char*, const char*, char **); - extern long ieee_handler(const char*, const char*, sigfpe_handler_type); -#endif - - const char *mode="exception", *in="all"; - char *out; - (void) nonstandard_arithmetic(); - (void) ieee_flags("clearall",mode,in,&out); - (void) ieee_handler("set","common",(sigfpe_handler_type)handler); - PyOS_setsig(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 - fpsetdefaults(); - PyOS_setsig(SIGFPE, handler); - -/*-- IBM AIX --------------------------------------------------------------*/ -#elif defined(__AIX) || defined(_AIX) - /* References: fp_trap, fp_enable man pages */ -#include - fp_trap(FP_TRAP_SYNC); - fp_enable(TRP_INVALID | TRP_DIV_BY_ZERO | TRP_OVERFLOW); - PyOS_setsig(SIGFPE, handler); - -/*-- DEC ALPHA LINUX ------------------------------------------------------*/ -#elif defined(__alpha) && defined(linux) -#include - unsigned long fp_control = - IEEE_TRAP_ENABLE_INV | IEEE_TRAP_ENABLE_DZE | IEEE_TRAP_ENABLE_OVF; - ieee_set_fp_control(fp_control); - PyOS_setsig(SIGFPE, handler); - -/*-- Cray Unicos ----------------------------------------------------------*/ -#elif defined(cray) - /* UNICOS delivers SIGFPE by default, but no matherr */ -#ifdef HAS_LIBMSET - libmset(-1); -#endif - PyOS_setsig(SIGFPE, handler); - -/*-- FreeBSD ----------------------------------------------------------------*/ -#elif defined(__FreeBSD__) - fpresetsticky(fpgetsticky()); - fpsetmask(FP_X_INV | FP_X_DZ | FP_X_OFL); - PyOS_setsig(SIGFPE, handler); - -/*-- Linux ----------------------------------------------------------------*/ -#elif defined(linux) -#ifdef __GLIBC__ -#include -#else -#include -#endif -#ifdef _FPU_SETCW - { - fpu_control_t cw = 0x1372; - _FPU_SETCW(cw); - } -#else - __setfpucw(0x1372); -#endif - PyOS_setsig(SIGFPE, handler); - -/*-- Microsoft Windows, NT ------------------------------------------------*/ -#elif defined(_MSC_VER) - /* Reference: Visual C++ Books Online 4.2, - Run-Time Library Reference, _control87, _controlfp */ -#include - unsigned int cw = _EM_INVALID | _EM_ZERODIVIDE | _EM_OVERFLOW; - (void)_controlfp(0, cw); - PyOS_setsig(SIGFPE, handler); - -/*-- Give Up --------------------------------------------------------------*/ -#else - fputs("Operation not implemented\n", stderr); -#endif - -} - -static PyObject *turnoff_sigfpe(PyObject *self,PyObject *args) -{ -#ifdef __FreeBSD__ - fpresetsticky(fpgetsticky()); - fpsetmask(0); -#else - fputs("Operation not implemented\n", stderr); -#endif - Py_RETURN_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"); - } -} - -static struct PyModuleDef fpectlmodule = { - PyModuleDef_HEAD_INIT, - "fpectl", - NULL, - -1, - fpectl_methods, - NULL, - NULL, - NULL, - NULL -}; - -PyMODINIT_FUNC PyInit_fpectl(void) -{ - PyObject *m, *d; - m = PyModule_Create(&fpectlmodule); - if (m == NULL) - return NULL; - d = PyModule_GetDict(m); - fpe_error = PyErr_NewException("fpectl.error", NULL, NULL); - if (fpe_error != NULL) - PyDict_SetItemString(d, "error", fpe_error); - return m; -} - -#ifdef __cplusplus -} -#endif diff --git a/Modules/fpetestmodule.c b/Modules/fpetestmodule.c deleted file mode 100644 index 1c232c98316..00000000000 --- a/Modules/fpetestmodule.c +++ /dev/null @@ -1,199 +0,0 @@ -/* - --------------------------------------------------------------------- - / 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_RETURN_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; -} diff --git a/Python/pyfpe.c b/Python/pyfpe.c index 925fa4654d9..31ef5d73b70 100644 --- a/Python/pyfpe.c +++ b/Python/pyfpe.c @@ -1,20 +1,12 @@ -#include "pyconfig.h" -#include "pyfpe.h" -/* - * The signal handler for SIGFPE is actually declared in an external - * module fpectl, or as preferred by the user. These variable - * definitions are required in order to compile Python without - * getting missing externals, but to actually handle SIGFPE requires - * defining a handler and enabling generation of SIGFPE. +/* These variables used to be used when Python was built with --with-fpectl, + * but support for that was dropped in 3.7. We continue to define them, + * though, because they may be referenced by extensions using the stable ABI. */ -#ifdef WANT_SIGFPE_HANDLER -jmp_buf PyFPE_jbuf; -int PyFPE_counter = 0; -#endif +#include "setjmp.h" -/* Have this outside the above #ifdef, since some picky ANSI compilers issue a - warning when compiling an empty file. */ +jmp_buf PyFPE_jbuf; +int PyFPE_counter; double PyFPE_dummy(void *dummy) diff --git a/aclocal.m4 b/aclocal.m4 index 4eb2dc3bbe2..61b2539d2e9 100644 --- a/aclocal.m4 +++ b/aclocal.m4 @@ -1,6 +1,6 @@ -# generated automatically by aclocal 1.15 -*- Autoconf -*- +# generated automatically by aclocal 1.15.1 -*- Autoconf -*- -# Copyright (C) 1996-2014 Free Software Foundation, Inc. +# Copyright (C) 1996-2017 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, @@ -13,7 +13,7 @@ m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])]) dnl pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*- -dnl serial 11 (pkg-config-0.29.1) +dnl serial 11 (pkg-config-0.29) dnl dnl Copyright © 2004 Scott James Remnant . dnl Copyright © 2012-2015 Dan Nicholson @@ -55,7 +55,7 @@ dnl dnl See the "Since" comment for each macro you use to see what version dnl of the macros you require. m4_defun([PKG_PREREQ], -[m4_define([PKG_MACROS_VERSION], [0.29.1]) +[m4_define([PKG_MACROS_VERSION], [0.29]) m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1, [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])]) ])dnl PKG_PREREQ @@ -170,7 +170,7 @@ if test $pkg_failed = yes; then _PKG_SHORT_ERRORS_SUPPORTED if test $_pkg_short_errors_supported = yes; then $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1` - else + else $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1` fi # Put the nasty error message in config.log where it belongs diff --git a/configure b/configure index da2c43fe7a2..afffc190751 100755 --- a/configure +++ b/configure @@ -832,7 +832,6 @@ with_c_locale_coercion with_c_locale_warning with_valgrind with_dtrace -with_fpectl with_libm with_libc enable_big_digits @@ -1539,7 +1538,6 @@ Optional Packages: locale --with-valgrind Enable Valgrind support --with(out)-dtrace disable/enable DTrace support - --with-fpectl enable SIGFPE catching --with-libm=STRING math library --with-libc=STRING C library --with(out)-computed-gotos @@ -13691,29 +13689,6 @@ fi fi -# Check for --with-fpectl -{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-fpectl" >&5 -$as_echo_n "checking for --with-fpectl... " >&6; } - -# Check whether --with-fpectl was given. -if test "${with_fpectl+set}" = set; then : - withval=$with_fpectl; -if test "$withval" != no -then - -$as_echo "#define WANT_SIGFPE_HANDLER 1" >>confdefs.h - - { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5 -$as_echo "yes" >&6; } -else { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5 -$as_echo "no" >&6; } -fi -else - { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5 -$as_echo "no" >&6; } -fi - - # check for --with-libm=... case $ac_sys_system in diff --git a/configure.ac b/configure.ac index 9a84e90e34c..0a48e41d5c3 100644 --- a/configure.ac +++ b/configure.ac @@ -4135,20 +4135,6 @@ AC_CHECK_FUNC(__fpu_control, [AC_CHECK_LIB(ieee, __fpu_control) ]) -# Check for --with-fpectl -AC_MSG_CHECKING(for --with-fpectl) -AC_ARG_WITH(fpectl, - AS_HELP_STRING([--with-fpectl], [enable SIGFPE catching]), -[ -if test "$withval" != no -then - AC_DEFINE(WANT_SIGFPE_HANDLER, 1, - [Define if you want SIGFPE handled (see Include/pyfpe.h).]) - AC_MSG_RESULT(yes) -else AC_MSG_RESULT(no) -fi], -[AC_MSG_RESULT(no)]) - # check for --with-libm=... AC_SUBST(LIBM) case $ac_sys_system in diff --git a/pyconfig.h.in b/pyconfig.h.in index 4cf2f035c23..7d366562b0c 100644 --- a/pyconfig.h.in +++ b/pyconfig.h.in @@ -500,7 +500,7 @@ /* Define to 1 if you have the header file. */ #undef HAVE_IEEEFP_H -/* Define to 1 if you have the 'if_nameindex' function. */ +/* Define to 1 if you have the `if_nameindex' function. */ #undef HAVE_IF_NAMEINDEX /* Define if you have the 'inet_aton' function. */ @@ -1413,9 +1413,6 @@ #endif -/* Define if you want SIGFPE handled (see Include/pyfpe.h). */ -#undef WANT_SIGFPE_HANDLER - /* Define if WINDOW in curses.h offers a field _flags. */ #undef WINDOW_HAS_FLAGS