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https://github.com/tildearrow/furnace.git
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108 lines
3 KiB
OCaml
108 lines
3 KiB
OCaml
(*
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* Copyright (c) 1997-1999 Massachusetts Institute of Technology
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*)
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type variable =
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(* temporary variables generated automatically *)
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| Temporary of int
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(* memory locations, e.g., array elements *)
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| Locative of (Unique.unique * Unique.unique *
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(int -> string) * int * string)
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(* constant values, e.g., twiddle factors *)
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| Constant of (Unique.unique * string)
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let hash v = Hashtbl.hash v
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let same a b = (a == b)
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let is_constant = function
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| Constant _ -> true
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| _ -> false
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let is_temporary = function
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| Temporary _ -> true
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| _ -> false
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let is_locative = function
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| Locative _ -> true
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| _ -> false
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let same_location a b =
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match (a, b) with
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| (Locative (location_a, _, _, _, _), Locative (location_b, _, _, _, _)) ->
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Unique.same location_a location_b
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| _ -> false
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let same_class a b =
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match (a, b) with
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| (Locative (_, class_a, _, _, _), Locative (_, class_b, _, _, _)) ->
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Unique.same class_a class_b
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| (Constant (class_a, _), Constant (class_b, _)) ->
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Unique.same class_a class_b
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| _ -> false
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let make_temporary =
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let tmp_count = ref 0
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in fun () -> begin
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tmp_count := !tmp_count + 1;
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Temporary !tmp_count
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end
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let make_constant class_token name =
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Constant (class_token, name)
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let make_locative location_token class_token name i vs =
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Locative (location_token, class_token, name, i, vs)
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let vstride_of_locative = function
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| Locative (_, _, _, _, vs) -> vs
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| _ -> failwith "vstride_of_locative"
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(* special naming conventions for variables *)
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let rec base62_of_int k =
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let x = k mod 62
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and y = k / 62 in
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let c =
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if x < 10 then
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Char.chr (x + Char.code '0')
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else if x < 36 then
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Char.chr (x + Char.code 'a' - 10)
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else
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Char.chr (x + Char.code 'A' - 36)
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in
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let s = String.make 1 c in
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let r = if y == 0 then "" else base62_of_int y in
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r ^ s
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let varname_of_int k =
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if !Magic.compact then
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base62_of_int k
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else
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string_of_int k
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let unparse = function
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| Temporary k -> "T" ^ (varname_of_int k)
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| Constant (_, name) -> name
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| Locative (_, _, name, i, _) -> name i
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let unparse_for_alignment m = function
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| Locative (_, _, name, i, _) -> name (i mod m)
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| _ -> failwith "unparse_for_alignment"
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