115 lines
4.3 KiB
OCaml
115 lines
4.3 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. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the 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_int : t -> bool = "%obj_is_int"
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let [@inline always] is_block a = not (is_int a)
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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 reachable_words : t -> int = "caml_obj_reachable_words"
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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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external floatarray_get : floatarray -> int -> float = "caml_floatarray_get"
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external floatarray_set :
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floatarray -> int -> float -> unit = "caml_floatarray_set"
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let [@inline always] double_field x i = floatarray_get (obj x : floatarray) i
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let [@inline always] set_double_field x i v =
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floatarray_set (obj x : floatarray) 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 first_non_constant_constructor_tag = 0
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let last_non_constant_constructor_tag = 245
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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_constructor 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 invalid_arg "Obj.extension_constructor"
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in
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if (tag name) = string_tag then (obj slot : extension_constructor)
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else invalid_arg "Obj.extension_constructor"
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let [@inline always] extension_name (slot : extension_constructor) =
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(obj (field (repr slot) 0) : string)
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let [@inline always] extension_id (slot : extension_constructor) =
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(obj (field (repr slot) 1) : int)
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module Ephemeron = struct
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type obj_t = t
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type t (** ephemeron *)
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external create: int -> t = "caml_ephe_create"
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let length x = size(repr x) - 2
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external get_key: t -> int -> obj_t option = "caml_ephe_get_key"
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external get_key_copy: t -> int -> obj_t option = "caml_ephe_get_key_copy"
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external set_key: t -> int -> obj_t -> unit = "caml_ephe_set_key"
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external unset_key: t -> int -> unit = "caml_ephe_unset_key"
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external check_key: t -> int -> bool = "caml_ephe_check_key"
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external blit_key : t -> int -> t -> int -> int -> unit
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= "caml_ephe_blit_key"
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external get_data: t -> obj_t option = "caml_ephe_get_data"
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external get_data_copy: t -> obj_t option = "caml_ephe_get_data_copy"
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external set_data: t -> obj_t -> unit = "caml_ephe_set_data"
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external unset_data: t -> unit = "caml_ephe_unset_data"
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external check_data: t -> bool = "caml_ephe_check_data"
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external blit_data : t -> t -> unit = "caml_ephe_blit_data"
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end
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