flang/module/iso_c_binding.f90

   1 !===-- module/iso_c_binding.f90 --------------------------------------------===!
   2 !
   3 ! Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 ! See https://llvm.org/LICENSE.txt for license information.
   5 ! SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 !
   7 !===------------------------------------------------------------------------===!
   8
   9 ! See Fortran 2018, clause 18.2
  10
  11 module iso_c_binding
  12
  13   use __Fortran_builtins, only: &
  14     c_f_pointer => __builtin_c_f_pointer, &
  15     c_ptr => __builtin_c_ptr, &
  16     c_funptr => __builtin_c_funptr, &
  17     c_sizeof => sizeof
  18
  19   type(c_ptr), parameter :: c_null_ptr = c_ptr(0)
  20   type(c_funptr), parameter :: c_null_funptr = c_funptr(0)
  21
  22   ! Table 18.2 (in clause 18.3.1)
  23   ! TODO: Specialize (via macros?) for alternative targets
  24   integer, parameter :: &
  25     c_int8_t = 1, &
  26     c_int16_t = 2, &
  27     c_int32_t = 4, &
  28     c_int64_t = 8, &
  29     c_int128_t = 16 ! anticipating future addition
  30   integer, parameter :: &
  31     c_int = c_int32_t, &
  32     c_short = c_int16_t, &
  33     c_long = c_int64_t, &
  34     c_long_long = c_int64_t, &
  35     c_signed_char = c_int8_t, &
  36     c_size_t = kind(c_sizeof(1)), &
  37     c_intmax_t = c_int128_t, &
  38     c_intptr_t = c_size_t, &
  39     c_ptrdiff_t = c_size_t
  40   integer, parameter :: &
  41     c_int_least8_t = c_int8_t, &
  42     c_int_fast8_t = c_int8_t, &
  43     c_int_least16_t = c_int16_t, &
  44     c_int_fast16_t = c_int16_t, &
  45     c_int_least32_t = c_int32_t, &
  46     c_int_fast32_t = c_int32_t, &
  47     c_int_least64_t = c_int64_t, &
  48     c_int_fast64_t = c_int64_t, &
  49     c_int_least128_t = c_int128_t, &
  50     c_int_fast128_t = c_int128_t
  51
  52   integer, parameter :: &
  53     c_float = 4, &
  54     c_double = 8, &
  55 #if __x86_64__
  56     c_long_double = 10
  57 #else
  58     c_long_double = 16
  59 #endif
  60
  61   integer, parameter :: &
  62     c_float_complex = c_float, &
  63     c_double_complex = c_double, &
  64     c_long_double_complex = c_long_double
  65
  66   integer, parameter :: c_bool = 1 ! TODO: or default LOGICAL?
  67   integer, parameter :: c_char = 1
  68
  69   ! C characters with special semantics
  70   character(kind=c_char, len=1), parameter :: c_null_char = achar(0)
  71   character(kind=c_char, len=1), parameter :: c_alert = achar(7)
  72   character(kind=c_char, len=1), parameter :: c_backspace = achar(8)
  73   character(kind=c_char, len=1), parameter :: c_form_feed = achar(12)
  74   character(kind=c_char, len=1), parameter :: c_new_line = achar(10)
  75   character(kind=c_char, len=1), parameter :: c_carriage_return = achar(13)
  76   character(kind=c_char, len=1), parameter :: c_horizontal_tab = achar(9)
  77   character(kind=c_char, len=1), parameter :: c_vertical_tab =  achar(11)
  78
  79  contains
  80
  81   logical function c_associated(c_ptr_1, c_ptr_2)
  82     type(c_ptr), intent(in) :: c_ptr_1
  83     type(c_ptr), intent(in), optional :: c_ptr_2
  84     if (c_ptr_1%__address == c_null_ptr%__address) then
  85       c_associated = .false.
  86     else if (present(c_ptr_2)) then
  87       c_associated = c_ptr_1%__address == c_ptr_2%__address
  88     else
  89       c_associated = .true.
  90     end if
  91   end function c_associated
  92
  93   function c_loc(x)
  94     type(c_ptr) :: c_loc
  95     type(*), dimension(..), intent(in) :: x
  96     c_loc = c_ptr(loc(x))
  97   end function c_loc
  98
  99   function c_funloc(x)
 100     type(c_funptr) :: c_funloc
 101     external :: x
 102     c_funloc = c_funptr(loc(x))
 103   end function c_funloc
 104
 105   ! TODO c_f_procpointer
 106
 107 end module iso_c_binding