github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/invalid.c (about)

     1  /* __gmp_invalid_operation -- invalid floating point operation.
     2  
     3     THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY.  THEY'RE ALMOST
     4     CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
     5     FUTURE GNU MP RELEASES.
     6  
     7  Copyright 2003 Free Software Foundation, Inc.
     8  
     9  This file is part of the GNU MP Library.
    10  
    11  The GNU MP Library is free software; you can redistribute it and/or modify
    12  it under the terms of either:
    13  
    14    * the GNU Lesser General Public License as published by the Free
    15      Software Foundation; either version 3 of the License, or (at your
    16      option) any later version.
    17  
    18  or
    19  
    20    * the GNU General Public License as published by the Free Software
    21      Foundation; either version 2 of the License, or (at your option) any
    22      later version.
    23  
    24  or both in parallel, as here.
    25  
    26  The GNU MP Library is distributed in the hope that it will be useful, but
    27  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    28  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    29  for more details.
    30  
    31  You should have received copies of the GNU General Public License and the
    32  GNU Lesser General Public License along with the GNU MP Library.  If not,
    33  see https://www.gnu.org/licenses/.  */
    34  
    35  #include "config.h"
    36  
    37  #include <signal.h>
    38  #include <stdlib.h>
    39  
    40  #if HAVE_UNISTD_H
    41  #include <unistd.h>  /* for getpid */
    42  #endif
    43  
    44  #include "gmp.h"
    45  #include "gmp-impl.h"
    46  
    47  
    48  /* Incidentally, kill is not available on mingw, but that's ok, it has raise
    49     and we'll be using that.  */
    50  #if ! HAVE_RAISE
    51  #define raise(sig)   kill (getpid(), sig)
    52  #endif
    53  
    54  
    55  /* __gmp_invalid_operation is for an invalid floating point operation, like
    56     mpz_set_d on a NaN or Inf.  It's done as a subroutine to minimize code in
    57     places raising an exception.
    58  
    59     feraiseexcept(FE_INVALID) is not used here, since unfortunately on most
    60     systems it would require libm.
    61  
    62     Alternatives:
    63  
    64     It might be possible to check whether a hardware "invalid operation" trap
    65     is enabled or not before raising a signal.  This would require all
    66     callers to be prepared to continue with some bogus result.  Bogus returns
    67     are bad, but presumably an application disabling the trap is prepared for
    68     that.
    69  
    70     On some systems (eg. BSD) the signal handler can find out the reason for
    71     a SIGFPE (overflow, invalid, div-by-zero, etc).  Perhaps we could get
    72     that into our raise too.
    73  
    74     i386 GLIBC implements feraiseexcept(FE_INVALID) with an asm fdiv 0/0.
    75     That would both respect the exceptions mask and give a reason code in a
    76     BSD signal.  */
    77  
    78  void
    79  __gmp_invalid_operation (void)
    80  {
    81    raise (SIGFPE);
    82    abort ();
    83  }