89 lines
2.9 KiB
OCaml
89 lines
2.9 KiB
OCaml
(***********************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the GNU Library General Public License, with *)
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(* the special exception on linking described in file ../LICENSE. *)
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(* *)
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(***********************************************************************)
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(* Operations on internal representations of values *)
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type t
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external repr : 'a -> t = "%identity"
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external obj : t -> 'a = "%identity"
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external magic : 'a -> 'b = "%identity"
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external is_block : t -> bool = "caml_obj_is_block"
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external is_int : t -> bool = "%obj_is_int"
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external tag : t -> int = "caml_obj_tag"
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external set_tag : t -> int -> unit = "caml_obj_set_tag"
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external size : t -> int = "%obj_size"
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external field : t -> int -> t = "%obj_field"
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external set_field : t -> int -> t -> unit = "%obj_set_field"
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let double_field x i = Array.get (obj x : float array) i
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let set_double_field x i v = Array.set (obj x : float array) i v
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external new_block : int -> int -> t = "caml_obj_block"
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external dup : t -> t = "caml_obj_dup"
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external truncate : t -> int -> unit = "caml_obj_truncate"
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external add_offset : t -> Int32.t -> t = "caml_obj_add_offset"
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let marshal (obj : t) =
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Marshal.to_bytes obj []
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let unmarshal str pos =
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(Marshal.from_bytes str pos, pos + Marshal.total_size str pos)
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let lazy_tag = 246
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let closure_tag = 247
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let object_tag = 248
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let infix_tag = 249
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let forward_tag = 250
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let no_scan_tag = 251
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let abstract_tag = 251
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let string_tag = 252
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let double_tag = 253
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let double_array_tag = 254
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let custom_tag = 255
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let final_tag = custom_tag
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let int_tag = 1000
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let out_of_heap_tag = 1001
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let unaligned_tag = 1002
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let extension_slot x =
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let x = repr x in
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let slot =
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if (is_block x) && (tag x) <> object_tag && (size x) >= 1 then field x 0
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else x
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in
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let name =
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if (is_block slot) && (tag slot) = object_tag then field slot 0
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else raise Not_found
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in
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if (tag name) = string_tag then slot
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else raise Not_found
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let extension_name x =
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try
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let slot = extension_slot x in
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(obj (field slot 0) : string)
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with Not_found -> invalid_arg "Obj.extension_name"
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let extension_id x =
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try
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let slot = extension_slot x in
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(obj (field slot 1) : int)
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with Not_found -> invalid_arg "Obj.extension_id"
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let extension_slot x =
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try
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extension_slot x
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with Not_found -> invalid_arg "Obj.extension_slot"
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