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(*
Copyright (c) 2000
Cambridge University Technical Services Limited
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*)
(**********************************************************************
*
* Functor Definition
*
**********************************************************************)
functor STRUCT
(structure LowerLevel : LowerLevelSig)
: StructSig =
struct
open LowerLevel
open Ctype
local
fun offsets _ [] = []
| offsets acc (t::ts) = let val pos = align acc t
in pos :: offsets (pos + sizeof t) ts
end
in val offsets = offsets 0
end
exception Zip;
fun zip [] [] = []
| zip (x::xs) (y::ys) = (x,y) :: zip xs ys
| zip _ _ = raise Zip;
fun unzip [] = ([],[])
| unzip ((x,y)::xys) = let val (xs,ys) = unzip xys
in (x::xs,y::ys)
end;
fun assigns (t::ts) (l::ls) (r::rs) = (assign t l r; assigns ts ls rs)
| assigns _ _ _ = ();
fun make_struct xs =
let
val (types,values) = unzip xs
val space = alloc 1 (Cstruct types)
val locations = map (fn n => offset n Cchar space) (offsets types)
in
assigns types locations values;
space
end
fun break_struct types v =
map (fn n => offset n Cchar v) (offsets types)
end (* struct *)
|
