2008-06-25 03:33:36 -04:00
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/* __gmp_invalid_operation -- invalid floating point operation.
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THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY. THEY'RE ALMOST
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CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
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FUTURE GNU MP RELEASES.
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Copyright 2003 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "config.h"
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#include <signal.h>
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#include <stdlib.h>
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#if HAVE_UNISTD_H
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#include <unistd.h> /* for getpid */
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#endif
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#include "gmp.h"
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#include "gmp-impl.h"
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/* Incidentally, kill is not available on mingw, but that's ok, it has raise
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and we'll be using that. */
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#if ! HAVE_RAISE
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#define raise(sig) kill (getpid(), sig)
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#endif
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/* __gmp_invalid_operation is for an invalid floating point operation, like
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mpz_set_d on a NaN or Inf. It's done as a subroutine to minimize code in
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places raising an exception.
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feraiseexcept(FE_INVALID) is not used here, since unfortunately on most
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systems it would require libm.
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Alternatives:
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It might be possible to check whether a hardware "invalid operation" trap
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is enabled or not before raising a signal. This would require all
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callers to be prepared to continue with some bogus result. Bogus returns
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are bad, but presumably an application disabling the trap is prepared for
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that.
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On some systems (eg. BSD) the signal handler can find out the reason for
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a SIGFPE (overflow, invalid, div-by-zero, etc). Perhaps we could get
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that into our raise too.
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i386 GLIBC implements feraiseexcept(FE_INVALID) with an asm fdiv 0/0.
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That would both respect the exceptions mask and give a reason code in a
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BSD signal. */
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void
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__gmp_invalid_operation (void)
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{
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raise (SIGFPE);
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abort ();
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}
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