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storage.ml
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storage.ml
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(*
* Copyright (c) 2017-2018, Artem Shinkarov <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*)
open Ast
open Value
open Print
open Ordinals
exception StorageFailure of string
type storage = (string, value) Hashtbl.t
let st_new: unit -> storage = fun () ->
Hashtbl.create 100
(* A helper function to do debugging *)
let find_and_raise st p expected msg =
let exists = try Hashtbl.find st p; true with Not_found -> false in
if expected <> exists then
raise (StorageFailure msg)
let st_add st p v =
(* This is for debugging purposes. *)
find_and_raise
st p false
(Printf.sprintf "Attempt to add the pointer `%s' which already exists in the storage" p);
Hashtbl.add st p v;
st
let st_remove st p =
(* This is for debugging purposes. *)
find_and_raise
st p true
(Printf.sprintf "Attempt to remove the pointer `%s' which does not exist in the storage" p);
Hashtbl.remove st p;
st
let st_update st p v =
(* This is for debugging purposes. *)
find_and_raise
st p true
(Printf.sprintf "Attempt to update the pointer `%s' which does not exist in the storage" p);
Hashtbl.replace st p v;
st
let st_lookup st p =
find_and_raise
st p true
(Printf.sprintf "Attempt to lookup the pointer `%s' which does not exist in the storage" p);
Hashtbl.find st p
let st_to_str st =
Hashtbl.fold (fun k v tail_s ->
Printf.sprintf
"%s |-> %s%s"
k
(value_to_str v)
(if tail_s = "" then "" else Printf.sprintf ", %s" tail_s)) st ""