why3_worker.ml 10.4 KB
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(********************************************************************)
(*                                                                  *)
(*  The Why3 Verification Platform   /   The Why3 Development Team  *)
(*  Copyright 2010-2016   --   INRIA - CNRS - Paris-Sud University  *)
(*                                                                  *)
(*  This software is distributed under the terms of the GNU Lesser  *)
(*  General Public License version 2.1, with the special exception  *)
(*  on linking described in file LICENSE.                           *)
(*                                                                  *)
(********************************************************************)


(* Interface to Why3 and Alt-Ergo *)

let why3_conf_file = "/trywhy3.conf"

open Why3
open Format
open Worker_proto

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let () = log_time ("Initialising why3 worker: start ")


(* reads the config file *)
let config : Whyconf.config = Whyconf.read_config (Some why3_conf_file)
(* the [main] section of the config file *)
let main : Whyconf.main = Whyconf.get_main config
(* all the provers detected, from the config file *)
let provers : Whyconf.config_prover Whyconf.Mprover.t =
  Whyconf.get_provers config

(* One prover named Alt-Ergo in the config file *)
let alt_ergo : Whyconf.config_prover =
  if Whyconf.Mprover.is_empty provers then begin
    eprintf "Prover Alt-Ergo not installed or not configured@.";
    exit 0
  end else snd (Whyconf.Mprover.choose provers)

(* builds the environment from the [loadpath] *)
let env : Env.env = Env.create_env (Whyconf.loadpath main)

let alt_ergo_driver : Driver.driver =
  try
    Printexc.record_backtrace true;
    Driver.load_driver env alt_ergo.Whyconf.driver []
  with e ->
    let s = Printexc.get_backtrace () in
    eprintf "Failed to load driver for alt-ergo: %a@.%s@."
      Exn_printer.exn_printer e s;
  exit 1

let () = log_time ("Initialising why3 worker: end ")

let split_trans = Trans.lookup_transform_l "split_goal_wp" env

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module W =
  struct
    let send msg =
      ignore (Worker.post_message (marshal msg))

    let set_onmessage f =
      Worker.set_onmessage (fun data -> f (unmarshal data))
  end

(* Task Management *)
module Why3Task = Task (* prevent shadowing *)

module Task =
  struct
    type task_info =
      { task : [ `Theory of Theory.theory | `Task of Task.task ];
	parent_id : id;
	mutable status : status;
	mutable subtasks : id list;
	loc : loc list;
	expl : string;
      }

    let task_table : (id, task_info) Hashtbl.t = Hashtbl.create 17

    let clear_table () = Hashtbl.clear task_table
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    let get_info id = Hashtbl.find task_table id
    let get_info_opt id =
      try
        Some (get_info id)
      with
        Not_found -> None
                      
    let get_parent_id id = (get_info id).parent_id
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    let task_to_string t =
      ignore (flush_str_formatter ());
      Driver.print_task alt_ergo_driver str_formatter t;
      flush_str_formatter ()

    let gen_id =
      let c = ref 0 in
      fun () -> incr c; "id" ^ (string_of_int !c)

    let register_task parent_id task =
      let id = gen_id () in
      let vid, expl, _ = Termcode.goal_expl_task ~root:false task in
      let expl = match expl with
        | Some s -> s
        | None -> vid.Ident.id_string
      in
      let task_info =
        { task = `Task(task);
	  parent_id = parent_id;
	  status = `New;
	  subtasks = [];
	  loc = [ (* todo *) ];
	  expl = expl }
      in
      Hashtbl.add task_table id task_info;
      id

    let register_theory th_name th =
      let th_id = gen_id () in
      let tasks = Why3Task.split_theory th None None in
      let task_ids = List.fold_left (fun acc t ->
				     let tid = register_task th_id t in
				     tid:: acc) [] tasks in
      Hashtbl.add task_table th_id  { task = `Theory(th);
				      parent_id = "theory-list";
				      status = `New;
				      subtasks = task_ids;
				      loc = [ (* todo *) ];
				      expl = th_name };
      th_id

    let get_task = function `Task t -> t
                          | `Theory _ -> log ("called get_task on a theory !"); assert false

    let set_status id st =
      let rec loop id st acc =
        match
          try
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            Some (get_info id)
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          with Not_found -> None
        with
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        | Some info when info.status <> st ->
	   info.status <- st;
           let acc = (UpdateStatus (st, id)) :: acc in
           begin
             match get_info_opt info.parent_id with
               None -> acc
             | Some par_info ->
	        let has_new, has_unknown =
	          List.fold_left
	            (fun (an, au) id ->
	             let info = Hashtbl.find task_table id in
	             (an || info.status = `New), (au || info.status = `Unknown))
	            (false, false) par_info.subtasks
	        in
	        let par_status = if has_new then `New else if
			           has_unknown then `Unknown
			         else `Valid
	        in
	        if par_info.status <> par_status then
	          loop info.parent_id par_status acc
                else acc
           end
        | _ -> acc

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      in
      loop id st []

    let rec clean_task id =
      try
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        let info = get_info id in
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        List.iter clean_task info.subtasks;
        Hashtbl.remove task_table id
      with
        Not_found -> ()

  end



(* External API *)
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let rec why3_prove id =
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  let open Task in
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  let t = get_info id in
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  match t.subtasks with
    [] ->  t.status <- `Unknown;
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	  let task = get_task t.task in
	  let msg = Task (id, t.parent_id, t.expl, task_to_string task, t.loc) in
	  W.send msg;
	  let l = set_status id `New in
          List.iter W.send l
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  | l -> List.iter why3_prove l


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let why3_split id =
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  let open Task in
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  let t = get_info id in
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  match t.subtasks with
    [] ->
    let subtasks = Trans.apply split_trans (get_task t.task) in
    t.subtasks <- List.fold_left (fun acc t ->
				 let tid = register_task id t in
				 why3_prove tid;
				 tid :: acc) [] subtasks
  | _ -> ()
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let why3_clean id =
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  let open Task in
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  try
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    let t = get_info id in
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    List.iter clean_task t.subtasks;
    t.subtasks <- [];
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    let l = set_status id `Unknown in
    List.iter W.send l
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  with
    Not_found -> ()
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let why3_parse_theories theories =
  let theories =
    Stdlib.Mstr.fold
      (fun thname th acc ->
       let loc =
         Opt.get_def Loc.dummy_position th.Theory.th_name.Ident.id_loc
       in
       (loc, (thname, th)) :: acc) theories []
  in
  let theories = List.sort  (fun (l1,_) (l2,_) -> Loc.compare l1 l2) theories in
  List.iter
    (fun (_, (th_name, th)) ->
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     let th_id = Task.register_theory th_name th in

     W.send (Theory(th_id, th_name));
     W.send (UpdateStatus(`New, th_id));
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     List.iter why3_prove (Task.get_info th_id).Task.subtasks
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    ) theories

let execute_symbol m fmt ps =
  match Mlw_decl.find_definition m.Mlw_module.mod_known ps with
  | None ->
     fprintf fmt "function '%s' has no definition"
	     ps.Mlw_expr.ps_name.Ident.id_string
  | Some d ->
    let lam = d.Mlw_expr.fun_lambda in
    match lam.Mlw_expr.l_args with
    | [pvs] when
        Mlw_ty.ity_equal pvs.Mlw_ty.pv_ity Mlw_ty.ity_unit ->
      begin
        let spec = lam.Mlw_expr.l_spec in
        let eff = spec.Mlw_ty.c_effect in
        let writes = eff.Mlw_ty.eff_writes in
        let body = lam.Mlw_expr.l_expr in
        try
          let res, _final_env =
            Mlw_interp.eval_global_expr env m.Mlw_module.mod_known
              m.Mlw_module.mod_theory.Theory.th_known writes body
          in
          match res with
          | Mlw_interp.Normal v -> Mlw_interp.print_value fmt v
          | Mlw_interp.Excep(x,v) ->
            fprintf fmt "exception %s(%a)"
              x.Mlw_ty.xs_name.Ident.id_string Mlw_interp.print_value v
          | Mlw_interp.Irred e ->
            fprintf fmt "cannot execute expression@ @[%a@]"
              Mlw_pretty.print_expr e
          | Mlw_interp.Fun _ ->
            fprintf fmt "result is a function"
        with e ->
          fprintf fmt
            "failure during execution of function: %a (%s)"
            Exn_printer.exn_printer e
            (Printexc.to_string e)
    end
  | _ ->
    fprintf fmt "Only functions with one unit argument can be executed"

let why3_execute (modules,_theories) =
  let result =
    let mods =
      Stdlib.Mstr.fold
	(fun _k m acc ->
         let th = m.Mlw_module.mod_theory in
         let modname = th.Theory.th_name.Ident.id_string in
         try
           let ps =
             Mlw_module.ns_find_ps m.Mlw_module.mod_export ["main"]
           in
           let result = Pp.sprintf "%a" (execute_symbol m) ps in
           let loc =
             Opt.get_def Loc.dummy_position th.Theory.th_name.Ident.id_loc
           in
           (loc, modname ^ ".main() returns " ^ result)
           :: acc
         with Not_found -> acc)
	modules []
    in
    match mods with
    | [] -> Error "No main function found"
    | _ ->
       let s =
	 List.sort
           (fun (l1,_) (l2,_) -> Loc.compare l2 l1)
           mods
       in
       (Result (List.rev_map snd s) )
  in
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  W.send result
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let temp_file_name = "/input.mlw"

let () = Sys_js.register_file ~name:temp_file_name ~content:""

let why3_run f lang code =
  try
    log_time "Why3 worker : start writing file";
    let ch = open_out temp_file_name in
    output_string ch code;
    close_out ch;
    log_time "Why3 worker : stop writing file";

    (* TODO: add a function Env.read_string or Env.read_from_lexbuf ? *)
    log_time "Why3 worker : start parsing file";

    let theories = Env.read_file lang env temp_file_name in
    log_time "Why3 worker : stop parsing file";
    f theories
  with
  | Loc.Located(loc,e') ->
     let _, l, b, e = Loc.get loc in
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     W.send (ErrorLoc ((l-1,b, l-1, e),
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		     Pp.sprintf
		       "error line %d, columns %d-%d: %a" l b e
		       Exn_printer.exn_printer e'))
  | e ->
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     W.send (Error (Pp.sprintf
		      "unexpected exception: %a (%s)" Exn_printer.exn_printer e
		      (Printexc.to_string e)))
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let () =
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  W.set_onmessage
    (function
      | Transform (`Split, id) -> why3_split id
       | Transform (`Prove, id) -> why3_prove id
       | Transform (`Clean, id) -> why3_clean id
       | ParseBuffer code ->
          Task.clear_table ();
          why3_run why3_parse_theories Env.base_language code
       | ExecuteBuffer code ->
	  why3_run why3_execute Mlw_module.mlw_language code
       | SetStatus (st, id) -> List.iter W.send (Task.set_status id st)
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    )
(*
Local Variables:
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compile-command: "unset LANG; make -C ../.. trywhy3"
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End:
*)