/tryocaml/js_of_ocaml-patched/compiler/subst.ml

  1(* Js_of_ocaml compiler
  2 * http://www.ocsigen.org/js_of_ocaml/
  3 * Copyright (C) 2010 Jérôme Vouillon
  4 * Laboratoire PPS - CNRS Université Paris Diderot
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU Lesser General Public License as published by
  8 * the Free Software Foundation, with linking exception;
  9 * either version 2.1 of the License, or (at your option) any later version.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 * GNU Lesser General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU Lesser General Public License
 17 * along with this program; if not, write to the Free Software
 18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 19 *)
 20
 21open Code
 22
 23let expr s e =
 24  match e with
 25    Const _ | Constant _ ->
 26      e
 27  | Apply (f, l, n) ->
 28      Apply (s f, List.map (fun x -> s x) l, n)
 29  | Block (n, a) ->
 30      Block (n, Array.map (fun x -> s x) a)
 31  | Field (x, n) ->
 32      Field (s x, n)
 33  | Closure (l, pc) ->
 34      Closure (l, pc)
 35  | Prim (p, l) ->
 36      Prim (p, List.map (fun x -> match x with Pv x -> Pv (s x) | Pc _ -> x) l)
 37
 38let instr s i =
 39  match i with
 40    Let (x, e) ->
 41      Let (x, expr s e)
 42  | Set_field (x, n, y) ->
 43      Set_field (s x, n, s y)
 44  | Offset_ref (x, n) ->
 45      Offset_ref (s x, n)
 46  | Array_set (x, y, z) ->
 47      Array_set (s x, s y, s z)
 48
 49let instrs s l = List.map (fun i -> instr s i) l
 50
 51let subst_cont s (pc, arg) = (pc, List.map (fun x -> s x) arg)
 52
 53let last s l =
 54  match l with
 55    Stop ->
 56      l
 57  | Branch cont ->
 58      Branch (subst_cont s cont)
 59  | Pushtrap (cont1, x, cont2, pc) ->
 60      Pushtrap (subst_cont s cont1, x, subst_cont s cont2, pc)
 61  | Return x ->
 62      Return (s x)
 63  | Raise x ->
 64      Raise (s x)
 65  | Cond (c, x, cont1, cont2) ->
 66      Cond (c, s x, subst_cont s cont1, subst_cont s cont2)
 67  | Switch (x, a1, a2) ->
 68      Switch (s x,
 69              Array.map (fun cont -> subst_cont s cont) a1,
 70              Array.map (fun cont -> subst_cont s cont) a2)
 71  | Poptrap cont ->
 72      Poptrap (subst_cont s cont)
 73
 74let program s (pc, blocks, free_pc) =
 75  let blocks =
 76    AddrMap.map
 77      (fun block ->
 78         { params = block.params;
 79           handler = Util.opt_map
 80                       (fun (x, cont) -> (x, subst_cont s cont)) block.handler;
 81           body = instrs s block.body;
 82           branch = last s block.branch }) blocks
 83  in
 84  (pc, blocks, free_pc)
 85
 86(****)
 87
 88let from_array s =
 89  fun x -> match s.(Var.idx x) with Some y -> y | None -> x
 90
 91(****)
 92
 93let rec build_mapping params args =
 94  match params, args with
 95    x :: params, y :: args ->
 96      VarMap.add x y (build_mapping params args)
 97  | [], _ ->
 98      VarMap.empty
 99  | _ ->
100      assert false
101
102let from_map m =
103  fun x -> try VarMap.find x m with Not_found -> x