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57 lines
2.7 KiB
OCaml
57 lines
2.7 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Heptagon *)
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(* *)
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(* Gwenael Delaval, LIG/INRIA, UJF *)
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(* Leonard Gerard, Parkas, ENS *)
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(* Adrien Guatto, Parkas, ENS *)
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(* Cedric Pasteur, Parkas, ENS *)
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(* *)
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(* Copyright 2012 ENS, INRIA, UJF *)
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(* *)
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(* This file is part of the Heptagon compiler. *)
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(* *)
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(* Heptagon is free software: you can redistribute it and/or modify it *)
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(* under the terms of the GNU General Public License as published by *)
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(* the Free Software Foundation, either version 3 of the License, or *)
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(* (at your option) any later version. *)
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(* *)
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(* Heptagon 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 Heptagon. If not, see <http://www.gnu.org/licenses/> *)
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(* *)
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(***********************************************************************)
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open Obc
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open Obc_mapfold
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let is_deadcode = function
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| Aassgn (lhs, e) -> (* remove x=x equations *)
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(match e.e_desc with
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| Eextvalue w -> Obc_compare.compare_lhs_extvalue lhs w = 0
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| _ -> false
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)
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| Acase (_, []) -> true
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| Afor(_, _, _, { b_body = [] }) -> true
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| _ -> false
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let act funs act_list a =
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let a, _ = Obc_mapfold.act funs [] a in
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if is_deadcode a then
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a, act_list
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else
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a, a::act_list
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let block funs acc b =
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let _, act_list = Obc_mapfold.block funs [] b in
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{ b with b_body = List.rev act_list }, acc
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let program p =
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let funs = { Obc_mapfold.defaults with block = block; act = act } in
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let p, _ = Obc_mapfold.program_it funs [] p in
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p
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