why3_worker.ml 12.7 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
(********************************************************************)
(*                                                                  *)
(*  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

21 22


23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
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
57 58
let intro_trans = Trans.lookup_transform "introduce_premises" env

59
(* CF gmain.ml ligne 568 et suivante *)
60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
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;
79
	loc : why3_loc list;
80
	expl : string;
81
        pretty : string;
82 83 84 85 86
      }

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

    let clear_table () = Hashtbl.clear task_table
87 88 89 90 91 92
    let get_info id = Hashtbl.find task_table id
    let get_info_opt id =
      try
        Some (get_info id)
      with
        Not_found -> None
93

94
    let get_parent_id id = (get_info id).parent_id
95

96
    let mk_loc (_, a,b,c) = (a,b,c)
97 98 99 100 101 102 103 104 105 106


    let warnings = ref []
    let clear_warnings () = warnings := []
    let () =
      Warning.set_hook (fun ?(loc=(Loc.user_position "" 1 0 0)) msg ->
                        let _, a,b,c = Loc.get loc in
                        warnings := ((a-1,b), msg) :: !warnings)


107
    let premise_kind = function
108
      | { Term. t_node = Term.Tnot _; t_loc = None } -> "why3-loc-neg-premise"
109 110
      | _ -> "why3-loc-premise"

111 112 113
    let collect_locs t =
      (* from why 3 ide *)
      let locs = ref [] in
114 115 116
      let rec get_locs kind f =
        Opt.iter (fun loc -> locs := (kind, mk_loc (Loc.get loc)) :: !locs) f.Term.t_loc;
        Term.t_fold (fun () t -> get_locs kind t ) () f
117 118 119 120
      in
      let rec get_t_locs f =
        match f.Term.t_node with
        | Term.Tbinop (Term.Timplies,f1,f2) ->
121
           get_locs (premise_kind f1) f1;
122 123 124
           get_t_locs f2
        | Term.Tlet (t,fb) ->
           let _,f1 = Term.t_open_bound fb in
125
           get_locs (premise_kind t) t;
126 127 128 129 130
           get_t_locs f1
        | Term.Tquant (Term.Tforall,fq) ->
           let _,_,f1 = Term.t_open_quant fq in
           get_t_locs f1
        | _ ->
131
           get_locs "why3-loc-goal" f
132 133 134 135 136 137 138
      in
      match t with
      | Some { Task.task_decl =
                 { Theory.td_node =
                     Theory.Decl { Decl.d_node = Decl.Dprop (Decl.Pgoal, _, f)}}} ->
         get_t_locs f; !locs
      |  _ -> []
139 140 141 142 143 144 145 146 147 148

    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)

149 150 151
    let task_text t =
      Pp.string_of Pretty.print_task t

152 153 154 155 156 157 158
    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
159 160
      let id_loc = match vid.Ident.id_loc with
          None -> []
161
        | Some l -> [ ("why3-loc-goal",mk_loc (Loc.get l)) ]
162
      in
163 164 165 166 167
      let task_info =
        { task = `Task(task);
	  parent_id = parent_id;
	  status = `New;
	  subtasks = [];
168
	  loc = id_loc @  (collect_locs task);
169
	  expl = expl;
170
          pretty = task_text (Trans.apply intro_trans task);
171
        }
172 173 174 175 176 177 178 179 180 181 182 183 184 185
      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;
186
				      loc = [];
187 188 189
				      expl = th_name;
                                      pretty = "";
                                    };
190 191 192 193 194 195 196 197 198
      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
199
            Some (get_info id)
200 201
          with Not_found -> None
        with
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225
        | 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

226 227 228 229 230
      in
      loop id st []

    let rec clean_task id =
      try
231
        let info = get_info id in
232 233 234 235 236 237 238 239 240 241
        List.iter clean_task info.subtasks;
        Hashtbl.remove task_table id
      with
        Not_found -> ()

  end



(* External API *)
242 243


244
let rec why3_prove ?(steps= ~-1) id =
245
  let open Task in
246
  let t = get_info id in
247 248
  match t.subtasks with
    [] ->  t.status <- `Unknown;
249
	  let task = get_task t.task in
250
	  let msg = Task (id, t.parent_id, t.expl, task_to_string task, t.loc, t.pretty, steps) in
251 252 253
	  W.send msg;
	  let l = set_status id `New in
          List.iter W.send l
254
  | l -> List.iter (why3_prove ~steps) l
255 256


Kim Nguyễn's avatar
Kim Nguyễn committed
257
let why3_split id =
258
  let open Task in
259
  let t = get_info id in
260 261
  match t.subtasks with
    [] ->
262 263 264 265 266 267 268 269 270 271
    begin
      match Trans.apply split_trans (get_task t.task), t.task with
	[], _ -> ()
      | [ child ], `Task(orig) when Why3.Task.task_equal child orig -> ()
      | subtasks, _ ->
	 t.subtasks <- List.fold_left (fun acc t ->
				       let tid = register_task id t in
				       why3_prove tid;
				       tid :: acc) [] subtasks
    end
272
  | _ -> ()
Kim Nguyễn's avatar
Kim Nguyễn committed
273

274

Kim Nguyễn's avatar
Kim Nguyễn committed
275

276
let why3_clean id =
277
  let open Task in
278
  try
279
    let t = get_info id in
280 281
    List.iter clean_task t.subtasks;
    t.subtasks <- [];
282 283
    let l = set_status id `Unknown in
    List.iter W.send l
284 285
  with
    Not_found -> ()
286

287 288 289 290
let why3_prove_all () =
  Hashtbl.iter
    (fun _ info ->
     match info.Task.task with
291
       `Theory _ -> List.iter (fun i -> why3_prove i) info.Task.subtasks
292 293
     | _ -> ()) Task.task_table

294

295
let why3_parse_theories theories =
296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
  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)) ->
     let th_id = Task.register_theory th_name th in
     W.send (Theory(th_id, th_name));
     let subs = (Task.get_info th_id).Task.subtasks in
     W.send (UpdateStatus( (if subs == [] then `Valid else `New) , th_id));
     List.iter (fun i -> why3_prove i) subs
    ) theories
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382

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
383
  W.send result
384 385 386 387 388 389 390 391 392 393 394 395

let temp_file_name = "/input.mlw"

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

let why3_run f lang code =
  try
    let ch = open_out temp_file_name in
    output_string ch code;
    close_out ch;

    let theories = Env.read_file lang env temp_file_name in
396
    W.send (Warning !Task.warnings);
397 398 399 400
    f theories
  with
  | Loc.Located(loc,e') ->
     let _, l, b, e = Loc.get loc in
401
     W.send (ErrorLoc ((l-1,b, l-1, e),
402 403 404 405
		     Pp.sprintf
		       "error line %d, columns %d-%d: %a" l b e
		       Exn_printer.exn_printer e'))
  | e ->
406 407 408
     W.send (Error (Pp.sprintf
		      "unexpected exception: %a (%s)" Exn_printer.exn_printer e
		      (Printexc.to_string e)))
409 410 411


let () =
412
  W.set_onmessage
413
    (fun msg ->
414 415 416 417 418 419 420
     let () =
       match msg with
       | Transform (`Split, id) -> why3_split id
       | Transform (`Prove(steps), id) -> why3_prove ~steps id
       | Transform (`Clean, id) -> why3_clean id
       | ProveAll -> why3_prove_all ()
       | ParseBuffer code ->
421
          Task.clear_warnings ();
422 423 424
          Task.clear_table ();
          why3_run why3_parse_theories Env.base_language code
       | ExecuteBuffer code ->
425
          Task.clear_warnings ();
426 427 428 429 430
	  Task.clear_table ();
	  why3_run why3_execute Mlw_module.mlw_language code
       | SetStatus (st, id) -> List.iter W.send (Task.set_status id st)
     in
     W.send Idle
431 432 433
    )
(*
Local Variables:
434
compile-command: "unset LANG; make -C ../.. trywhy3"
435 436
End:
*)