iso_c_binding.f90
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!===-- module/iso_c_binding.f90 --------------------------------------------===!
!
! Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
! See https://llvm.org/LICENSE.txt for license information.
! SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
!
!===------------------------------------------------------------------------===!
! See Fortran 2018, clause 18.2
module iso_c_binding
use __Fortran_builtins, only: &
c_f_pointer => __builtin_c_f_pointer, &
c_ptr => __builtin_c_ptr, &
c_funptr => __builtin_c_funptr
type(c_ptr), parameter :: c_null_ptr = c_ptr()
type(c_funptr), parameter :: c_null_funptr = c_funptr()
! Table 18.2 (in clause 18.3.1)
! TODO: Specialize (via macros?) for alternative targets
integer, parameter :: &
c_int8_t = 1, &
c_int16_t = 2, &
c_int32_t = 4, &
c_int64_t = 8, &
c_int128_t = 16 ! anticipating future addition
integer, parameter :: &
c_int = c_int32_t, &
c_short = c_int16_t, &
c_long = c_int64_t, &
c_long_long = c_int64_t, &
c_signed_char = c_int8_t, &
c_size_t = c_long_long, &
c_intmax_t = c_int128_t, &
c_intptr_t = c_size_t, &
c_ptrdiff_t = c_size_t
integer, parameter :: &
c_int_least8_t = c_int8_t, &
c_int_fast8_t = c_int8_t, &
c_int_least16_t = c_int16_t, &
c_int_fast16_t = c_int16_t, &
c_int_least32_t = c_int32_t, &
c_int_fast32_t = c_int32_t, &
c_int_least64_t = c_int64_t, &
c_int_fast64_t = c_int64_t, &
c_int_least128_t = c_int128_t, &
c_int_fast128_t = c_int128_t
integer, parameter :: &
c_float = 4, &
c_double = 8, &
#if __x86_64__
c_long_double = 10
#else
c_long_double = 16
#endif
integer, parameter :: &
c_float_complex = c_float, &
c_double_complex = c_double, &
c_long_double_complex = c_long_double
integer, parameter :: c_bool = 1 ! TODO: or default LOGICAL?
integer, parameter :: c_char = 1
! C characters with special semantics
character(kind=c_char, len=1), parameter :: c_null_char = achar(0)
character(kind=c_char, len=1), parameter :: c_alert = achar(7)
character(kind=c_char, len=1), parameter :: c_backspace = achar(8)
character(kind=c_char, len=1), parameter :: c_form_feed = achar(12)
character(kind=c_char, len=1), parameter :: c_new_line = achar(10)
character(kind=c_char, len=1), parameter :: c_carriage_return = achar(13)
character(kind=c_char, len=1), parameter :: c_horizontal_tab = achar(9)
character(kind=c_char, len=1), parameter :: c_vertical_tab = achar(11)
contains
logical function c_associated(c_ptr_1, c_ptr_2)
type(c_ptr), intent(in) :: c_ptr_1
type(c_ptr), intent(in), optional :: c_ptr_2
if (c_ptr_1%__address == c_null_ptr%__address) then
c_associated = .false.
else if (present(c_ptr_2)) then
c_associated = c_ptr_1%__address == c_ptr_2%__address
else
c_associated = .true.
end if
end function c_associated
function c_loc(x)
type(c_ptr) :: c_loc
type(*), dimension(..), intent(in) :: x
c_loc = c_ptr(loc(x))
end function c_loc
function c_funloc(x)
type(c_funptr) :: c_funloc
external :: x
c_funloc = c_funptr(loc(x))
end function c_funloc
! TODO c_f_procpointer
! TODO c_sizeof
end module iso_c_binding