(***********************************************************************)
(*                                                                     *)
(*                           Objective Caml                            *)
(*                                                                     *)
(*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         *)
(*                                                                     *)
(*  Copyright 1996 Institut National de Recherche en Informatique et   *)
(*  en Automatique.  All rights reserved.  This file is distributed    *)
(*  under the terms of the GNU Library General Public License, with    *)
(*  the special exception on linking described in file ../LICENSE.     *)
(*                                                                     *)
(***********************************************************************)

(* $Id$ *)

(* Operations on internal representations of values *)

type t

external repr : 'a -> t = "%identity"
external obj : t -> 'a = "%identity"
external magic : 'a -> 'b = "%identity"
external is_block : t -> bool = "obj_is_block"
external is_int : t -> bool = "%obj_is_int"
external tag : t -> int = "obj_tag"
external size : t -> int = "%obj_size"
external field : t -> int -> t = "%obj_field"
external set_field : t -> int -> t -> unit = "%obj_set_field"
external new_block : int -> int -> t = "obj_block"
external dup : t -> t = "obj_dup"
external truncate : t -> int -> unit = "obj_truncate"

let marshal (obj : t) =
  Marshal.to_string obj []
let unmarshal str pos =
  (Marshal.from_string str pos, pos + Marshal.total_size str pos)

let no_scan_tag = 251
let closure_tag = 250
let infix_tag = 249
let object_tag = 248
let abstract_tag = 251
let string_tag = 252
let double_tag = 253
let double_array_tag = 254
let final_tag = 255