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! Implementation of the IEEE_EXCEPTIONS standard intrinsic module
! Copyright (C) 2013-2015 Free Software Foundation, Inc.
! Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
!
! This file is part of the GNU Fortran runtime library (libgfortran).
!
! Libgfortran is free software; you can redistribute it and/or
! modify it under the terms of the GNU General Public
! License as published by the Free Software Foundation; either
! version 3 of the License, or (at your option) any later version.
!
! Libgfortran is distributed in the hope that it will be useful,
! but WITHOUT ANY WARRANTY; without even the implied warranty of
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! GNU General Public License for more details.
!
! Under Section 7 of GPL version 3, you are granted additional
! permissions described in the GCC Runtime Library Exception, version
! 3.1, as published by the Free Software Foundation.
!
! You should have received a copy of the GNU General Public License and
! a copy of the GCC Runtime Library Exception along with this program;
! see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
! <http://www.gnu.org/licenses/>. */
#include "config.h"
#include "kinds.inc"
#include "c99_protos.inc"
#include "fpu-target.inc"
module IEEE_EXCEPTIONS
implicit none
private
! Derived types and named constants
type, public :: IEEE_FLAG_TYPE
private
integer :: hidden
end type
type(IEEE_FLAG_TYPE), parameter, public :: &
IEEE_INVALID = IEEE_FLAG_TYPE(GFC_FPE_INVALID), &
IEEE_OVERFLOW = IEEE_FLAG_TYPE(GFC_FPE_OVERFLOW), &
IEEE_DIVIDE_BY_ZERO = IEEE_FLAG_TYPE(GFC_FPE_ZERO), &
IEEE_UNDERFLOW = IEEE_FLAG_TYPE(GFC_FPE_UNDERFLOW), &
IEEE_INEXACT = IEEE_FLAG_TYPE(GFC_FPE_INEXACT)
type(IEEE_FLAG_TYPE), parameter, public :: &
IEEE_USUAL(3) = [ IEEE_OVERFLOW, IEEE_DIVIDE_BY_ZERO, IEEE_INVALID ], &
IEEE_ALL(5) = [ IEEE_USUAL, IEEE_UNDERFLOW, IEEE_INEXACT ]
type, public :: IEEE_STATUS_TYPE
private
character(len=GFC_FPE_STATE_BUFFER_SIZE) :: hidden
end type
interface IEEE_SUPPORT_FLAG
module procedure IEEE_SUPPORT_FLAG_NOARG, &
IEEE_SUPPORT_FLAG_4, &
IEEE_SUPPORT_FLAG_8
end interface IEEE_SUPPORT_FLAG
public :: IEEE_SUPPORT_FLAG, IEEE_SUPPORT_HALTING
public :: IEEE_SET_HALTING_MODE, IEEE_GET_HALTING_MODE
public :: IEEE_SET_FLAG, IEEE_GET_FLAG
public :: IEEE_SET_STATUS, IEEE_GET_STATUS
contains
! Saving and restoring floating-point status
subroutine IEEE_GET_STATUS (STATUS_VALUE)
implicit none
type(IEEE_STATUS_TYPE), intent(out) :: STATUS_VALUE
interface
subroutine helper(ptr) &
bind(c, name="_gfortrani_get_fpu_state")
use, intrinsic :: iso_c_binding, only : c_char
character(kind=c_char) :: ptr(*)
end subroutine
end interface
call helper(STATUS_VALUE%hidden)
end subroutine
subroutine IEEE_SET_STATUS (STATUS_VALUE)
implicit none
type(IEEE_STATUS_TYPE), intent(in) :: STATUS_VALUE
interface
subroutine helper(ptr) &
bind(c, name="_gfortrani_set_fpu_state")
use, intrinsic :: iso_c_binding, only : c_char
character(kind=c_char) :: ptr(*)
end subroutine
end interface
call helper(STATUS_VALUE%hidden)
end subroutine
! Getting and setting flags
elemental subroutine IEEE_GET_FLAG (FLAG, FLAG_VALUE)
implicit none
type(IEEE_FLAG_TYPE), intent(in) :: FLAG
logical, intent(out) :: FLAG_VALUE
interface
pure integer function helper() &
bind(c, name="_gfortrani_get_fpu_except_flags")
end function
end interface
FLAG_VALUE = (IAND(helper(), FLAG%hidden) /= 0)
end subroutine
elemental subroutine IEEE_SET_FLAG (FLAG, FLAG_VALUE)
implicit none
type(IEEE_FLAG_TYPE), intent(in) :: FLAG
logical, intent(in) :: FLAG_VALUE
interface
pure subroutine helper(set, clear) &
bind(c, name="_gfortrani_set_fpu_except_flags")
integer, intent(in), value :: set, clear
end subroutine
end interface
if (FLAG_VALUE) then
call helper(FLAG%hidden, 0)
else
call helper(0, FLAG%hidden)
end if
end subroutine
! Querying and changing the halting mode
elemental subroutine IEEE_GET_HALTING_MODE (FLAG, HALTING)
implicit none
type(IEEE_FLAG_TYPE), intent(in) :: FLAG
logical, intent(out) :: HALTING
interface
pure integer function helper() &
bind(c, name="_gfortrani_get_fpu_trap_exceptions")
end function
end interface
HALTING = (IAND(helper(), FLAG%hidden) /= 0)
end subroutine
elemental subroutine IEEE_SET_HALTING_MODE (FLAG, HALTING)
implicit none
type(IEEE_FLAG_TYPE), intent(in) :: FLAG
logical, intent(in) :: HALTING
interface
pure subroutine helper(trap, notrap) &
bind(c, name="_gfortrani_set_fpu_trap_exceptions")
integer, intent(in), value :: trap, notrap
end subroutine
end interface
if (HALTING) then
call helper(FLAG%hidden, 0)
else
call helper(0, FLAG%hidden)
end if
end subroutine
! Querying support
pure logical function IEEE_SUPPORT_HALTING (FLAG)
implicit none
type(IEEE_FLAG_TYPE), intent(in) :: FLAG
interface
pure integer function helper(flag) &
bind(c, name="_gfortrani_support_fpu_trap")
integer, intent(in), value :: flag
end function
end interface
IEEE_SUPPORT_HALTING = (helper(FLAG%hidden) /= 0)
end function
pure logical function IEEE_SUPPORT_FLAG_NOARG (FLAG)
implicit none
type(IEEE_FLAG_TYPE), intent(in) :: FLAG
interface
pure integer function helper(flag) &
bind(c, name="_gfortrani_support_fpu_flag")
integer, intent(in), value :: flag
end function
end interface
IEEE_SUPPORT_FLAG_NOARG = (helper(FLAG%hidden) /= 0)
end function
pure logical function IEEE_SUPPORT_FLAG_4 (FLAG, X) result(res)
implicit none
type(IEEE_FLAG_TYPE), intent(in) :: FLAG
real(kind=4), intent(in) :: X
res = IEEE_SUPPORT_FLAG_NOARG(FLAG)
end function
pure logical function IEEE_SUPPORT_FLAG_8 (FLAG, X) result(res)
implicit none
type(IEEE_FLAG_TYPE), intent(in) :: FLAG
real(kind=8), intent(in) :: X
res = IEEE_SUPPORT_FLAG_NOARG(FLAG)
end function
end module IEEE_EXCEPTIONS
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