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134 lines
5.6 KiB
OCaml
134 lines
5.6 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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(* Checks that a node declared stateless is stateless, and set possible nodes as stateless. *)
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open Names
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open Location
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open Signature
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open Modules
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open Heptagon
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open Hept_mapfold
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type error =
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| Eshould_be_a_node
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| Eexp_should_be_stateless
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let message loc kind =
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begin match kind with
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| Eshould_be_a_node ->
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Format.eprintf "%aThis node is stateful but was declared stateless.@."
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print_location loc
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| Eexp_should_be_stateless ->
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Format.eprintf "%aThis expression should be stateless.@."
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print_location loc
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end;
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raise Errors.Error
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(* a last is stateful *)
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let last _ stateful l = match l with
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| Var -> l, stateful
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| Last _ -> l, true
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(* Returns whether the exp is stateful.
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Replaces node calls with the correct Efun or Enode depending on the node signature. *)
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let edesc funs stateful ed =
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let ed, stateful = Hept_mapfold.edesc funs stateful ed in
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match ed with
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| Efby _ | Epre _ -> ed, true
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| Eapp({ a_op = Earrow }, _, _) -> ed, true
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| Eapp({ a_op = (Enode f | Efun f) } as app, e_list, r) ->
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let ty_desc = find_value f in
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let op = if ty_desc.node_stateful then Enode f else Efun f in
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Eapp({ app with a_op = op }, e_list, r), ty_desc.node_stateful or stateful
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| Eiterator(it, ({ a_op = (Enode f | Efun f) } as app), n, pe_list, e_list, r) ->
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let ty_desc = find_value f in
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let op = if ty_desc.node_stateful then Enode f else Efun f in
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Eiterator(it, { app with a_op = op }, n, pe_list, e_list, r),
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ty_desc.node_stateful or stateful
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| _ -> ed, stateful
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(* Automatons have an hidden state whatever *)
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let eqdesc funs stateful eqd =
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let eqd, stateful = Hept_mapfold.eqdesc funs stateful eqd in
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let is_automaton = match eqd with | Eautomaton _ -> true | _ -> false in
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eqd, stateful or is_automaton
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(* update eq_stateful field *)
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let eq funs acc eq =
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let eq, stateful = Hept_mapfold.eq funs false eq in
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{ eq with eq_stateful = stateful }, stateful or acc
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(* update b_stateful field *)
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let block funs acc b =
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let b, stateful = Hept_mapfold.block funs false b in
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{ b with b_stateful = stateful }, acc or stateful
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(* Strong preemption should be decided with stateles expressions *)
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let escape_unless funs acc esc =
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let esc, stateful = Hept_mapfold.escape funs false esc in
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if stateful then
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message esc.e_cond.e_loc Eexp_should_be_stateless;
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esc, acc or stateful
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(* Present conditions should be stateless *)
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let present_handler funs acc ph =
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let p_cond, stateful = Hept_mapfold.exp_it funs false ph.p_cond in
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if stateful then
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message ph.p_cond.e_loc Eexp_should_be_stateless;
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let p_block, acc = Hept_mapfold.block_it funs acc ph.p_block in
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{ p_cond = p_cond; p_block = p_block }, acc
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(* Funs with states are rejected, nodes without state are set as funs *)
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let node_dec funs _ n =
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Idents.enter_node n.n_name;
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let n, stateful = Hept_mapfold.node_dec funs false n in
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if stateful & (not n.n_stateful) then message n.n_loc Eshould_be_a_node;
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if not stateful & n.n_stateful (* update the global env if stateful is not necessary *)
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then Modules.replace_value n.n_name
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{ (Modules.find_value n.n_name) with Signature.node_stateful = false };
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{ n with n_stateful = stateful }, false (* set stateful only if needed *)
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let funs =
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{ Hept_mapfold.defaults with
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edesc = edesc;
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escape_unless = escape_unless;
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present_handler = present_handler;
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eqdesc = eqdesc;
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last = last;
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eq = eq;
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block = block;
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node_dec = node_dec; }
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let exp_is_stateful e =
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let _, res = Hept_mapfold.edesc_it funs false e.e_desc in
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res
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let program p =
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let p, _ = Hept_mapfold.program_it funs false p in
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p
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