session_itp.ml 65.5 KB
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(********************************************************************)
(*                                                                  *)
(*  The Why3 Verification Platform   /   The Why3 Development Team  *)
(*  Copyright 2010-2017   --   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.                           *)
(*                                                                  *)
(********************************************************************)
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open Stdlib

module Hprover = Whyconf.Hprover

let debug = Debug.register_info_flag "session_itp"
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    ~desc:"Pring@ debugging@ messages@ about@ Why3@ session@ \
           creation,@ reading@ and@ writing."
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let debug_merge = Debug.lookup_flag "session_pairing"

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let debug_stack_trace = Debug.lookup_flag "stack_trace"

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type transID = int
type proofNodeID = int
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type proofAttemptID = int
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let print_proofNodeID fmt id =
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  Format.fprintf fmt "proofNodeID<%d>" id

let print_proofAttemptID fmt id =
  Format.fprintf fmt "proofAttemptID<%d>" id
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type theory = {
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  theory_name                   : Ident.ident;
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  mutable theory_goals          : proofNodeID list;
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  theory_parent_name            : string;
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  theory_is_detached            : bool;
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  mutable theory_checksum       : Termcode.checksum option;
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}

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let theory_name t = t.theory_name
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let theory_goals t = t.theory_goals
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type proof_parent = Trans of transID | Theory of theory
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type proof_attempt_node = {
  parent                 : proofNodeID;
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  mutable prover         : Whyconf.prover;
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  limit                  : Call_provers.resource_limit;
  mutable proof_state    : Call_provers.prover_result option;
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  (* None means that the call was not done or never returned *)
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  mutable proof_obsolete : bool;
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  mutable proof_script   : string option;  (* non empty for external ITP *)
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}

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let set_proof_script pa file =
  assert (pa.proof_script = None);
  pa.proof_script <- Some file

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type proof_node = {
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  proofn_name                    : Ident.ident;
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  proofn_expl                    : string;
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  proofn_parent                  : proof_parent;
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  proofn_checksum                : Termcode.checksum option;
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  proofn_shape                   : Termcode.shape;
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  proofn_attempts                : proofAttemptID Hprover.t;
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  mutable proofn_transformations : transID list;
}

type transformation_node = {
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  transf_name                      : string;
  transf_args                      : string list;
  transf_subtasks                  : proofNodeID list;
  transf_parent                    : proofNodeID;
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}

type file = {
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  file_name              : string;
  file_format            : string option;
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  file_is_detached       : bool;
  mutable file_theories  : theory list;
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}

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let file_name f = f.file_name
let file_format f = f.file_format
let file_theories f = f.file_theories

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type any =
  | AFile of file
  | ATh of theory
  | ATn of transID
  | APn of proofNodeID
  | APa of proofAttemptID

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module Hpn = Hint
module Htn = Hint
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module Hpan = Hint
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type session = {
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  proofAttempt_table            : proof_attempt_node Hint.t;
  mutable next_proofAttemptID   : int;
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  proofNode_table               : proof_node Hint.t;
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  mutable next_proofNodeID      : int;
  trans_table                   : transformation_node Hint.t;
  mutable next_transID          : int;
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  session_dir                   : string; (** Absolute path *)
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  session_files                 : file Hstr.t;
  mutable session_shape_version : int;
  session_prover_ids            : int Hprover.t;
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  (* tasks *)
  session_raw_tasks : Task.task Hpn.t;
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  session_tasks : (Task.task * Trans.naming_table) Hpn.t;
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  (* proved status *)
  file_state: bool Hstr.t;
  th_state: bool Ident.Hid.t;
  tn_state: bool Htn.t;
  pn_state : bool Hpn.t;
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}
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let theory_parent s th =
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  Debug.dprintf debug "[Session_itp.theory_parent] th.parent_name = %s@."
                th.theory_parent_name;
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  Hstr.find s.session_files th.theory_parent_name

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let session_iter_proof_attempt f s =
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  Hint.iter f s.proofAttempt_table
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(* This is not needed. Keeping it as information on the structure
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type tree = {
    tree_node_id : proofNodeID;
    tree_goal_name : string;
    tree_proof_attempts : proof_attempt list; (* proof attempts on this node *)
    tree_transformations : (transID * string * tree list) list;
                                (* transformations on this node *)
  }
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*)
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(*
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let rec get_tree s id : tree =
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  let t = Hint.find s.proofNode_table id in
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  let pal =
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    Hprover.fold (fun _ pa acc -> pa.proofa_attempt::acc) t.proofn_attempts []
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  in
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  let trl = List.map (get_trans s) t.proofn_transformations in
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  { tree_node_id = id;
    tree_goal_name = t.proofn_name.Ident.id_string;
    tree_proof_attempts = pal;
    tree_transformations = trl;
  }
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and get_trans s id =
  let tr = Hint.find s.trans_table id in
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  (id, tr.transf_name, List.map (get_tree s) tr.transf_subtasks)
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*)
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(*
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let get_theories s =
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  Hstr.fold
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    (fun _fn f acc ->
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     let c =
       List.map
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         (fun th -> (th.theory_name.Ident.id_string, th.theory_goals))
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         f.file_theories
     in
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     (f,c) :: acc)
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    s.session_files []
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 *)

let get_files s = s.session_files
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let get_file s name = Hstr.find s.session_files name
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let get_dir s = s.session_dir

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(*
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let get_node (s : session) (n : int) =
  let _ = Hint.find s.proofNode_table n in n

let get_trans (s : session) (n : int) =
  let _ = Hint.find s.trans_table n in n
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*)
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(* Generation of new IDs *)
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let gen_transID (s : session) =
  let id = s.next_transID in
  s.next_transID <- id + 1;
  id

let gen_proofNodeID (s : session) =
  let id = s.next_proofNodeID in
  s.next_proofNodeID <- id + 1;
  id

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let gen_proofAttemptID (s : session) =
  let id = s.next_proofAttemptID in
  s.next_proofAttemptID <- id + 1;
  id

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(* Get elements of the session tree *)

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exception BadID
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let get_proof_attempt_node (s : session) (id : proofAttemptID) =
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  try
    Hint.find s.proofAttempt_table id
  with Not_found -> raise BadID

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let get_proofNode (s : session) (id : proofNodeID) =
  try
    Hint.find s.proofNode_table id
  with Not_found -> raise BadID

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let get_raw_task s id =
  Hpn.find s.session_raw_tasks id

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let get_task s n =
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  try
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    Hpn.find s.session_tasks n
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  with Not_found ->
    let t = get_raw_task s n in
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    let ti = Trans.apply Introduction.introduce_premises t in
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    let ta = Args_wrapper.build_naming_tables ti in
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    Hpn.add s.session_tasks n (ti,ta);
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    ti,ta
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let get_transfNode (s : session) (id : transID) =
  try
    Hint.find s.trans_table id
  with Not_found -> raise BadID

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let get_transformations (s : session) (id : proofNodeID) =
  (get_proofNode s id).proofn_transformations

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let get_proof_attempt_ids (s : session) (id : proofNodeID) =
  (get_proofNode s id).proofn_attempts

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let get_proof_attempt_parent (s : session) (a : proofAttemptID) =
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  (get_proof_attempt_node s a).parent
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let get_proof_attempts (s : session) (id : proofNodeID) =
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  Hprover.fold (fun _ a l ->
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                let pa = get_proof_attempt_node s a in
                pa :: l)
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               (get_proofNode s id).proofn_attempts []
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let get_sub_tasks (s : session) (id : transID) =
  (get_transfNode s id).transf_subtasks

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let get_transf_args (s : session) (id : transID) =
  (get_transfNode s id).transf_args

let get_transf_name (s : session) (id : transID) =
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  (get_transfNode s id).transf_name

let get_proof_name (s : session) (id : proofNodeID) =
  (get_proofNode s id).proofn_name

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let get_proof_expl (s : session) (id : proofNodeID) =
  (get_proofNode s id).proofn_expl

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let get_proof_parent (s : session) (id : proofNodeID) =
  (get_proofNode s id).proofn_parent

let get_trans_parent (s : session) (id : transID) =
  (get_transfNode s id).transf_parent

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(* TODO to be done with detached transformations *)
let get_detached_trans (_s: session) (_id: proofNodeID) =
  []

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let rec is_detached (s: session) (a: any) =
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  match a with
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  | AFile file -> file.file_is_detached
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  | ATh th     -> th.theory_is_detached
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  | ATn tn     ->
    let pn_id = get_trans_parent s tn in
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    is_detached s (APn pn_id) ||
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    List.exists (fun x -> x = tn) (get_detached_trans s pn_id)
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  | APn pn     ->
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    begin
      try let _ = get_raw_task s pn in false
      with Not_found -> true
    end
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  | APa pa     ->
    let pa = get_proof_attempt_node s pa in
    let pn_id = pa.parent in
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    is_detached s (APn pn_id)
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let rec get_encapsulating_theory s any =
  match any with
  | AFile _f -> assert (false)
  | ATh th -> th
  | ATn tn ->
      let pn_id = get_trans_parent s tn in
      get_encapsulating_theory s (APn pn_id)
  | APn pn ->
      (match get_proof_parent s pn with
      | Theory th -> th
      | Trans tn -> get_encapsulating_theory s (ATn tn)
      )
  | APa pa ->
      let pn = get_proof_attempt_parent s pa in
      get_encapsulating_theory s (APn pn)

let get_encapsulating_file s any =
  match any with
  | AFile f -> f
  | ATh th -> theory_parent s th
  | _ ->
      let th = get_encapsulating_theory s any in
      theory_parent s th

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let set_obsolete s paid b =
  let pa = get_proof_attempt_node s paid in
  pa.proof_obsolete <- b

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(* Iterations functions on the session tree *)

let rec fold_all_any_of_transn s f acc trid =
  let tr = get_transfNode s trid in
  let acc =
    List.fold_left
      (fold_all_any_of_proofn s f)
      acc tr.transf_subtasks
  in
  f acc (ATn trid)

and fold_all_any_of_proofn s f acc pnid =
  let pn = get_proofNode s pnid in
  let acc =
    List.fold_left
      (fun acc trid ->
        fold_all_any_of_transn s f acc trid)
      acc pn.proofn_transformations
  in
  let acc =
    Hprover.fold
      (fun _p paid acc ->
        f acc (APa paid))
      pn.proofn_attempts acc
  in
  f acc (APn pnid)

let fold_all_any_of_theory s f acc th =
  let acc = List.fold_left (fold_all_any_of_proofn s f) acc th.theory_goals in
  f acc (ATh th)

let fold_all_any_of_file s f acc file =
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  let acc =
    List.fold_left (fold_all_any_of_theory s f) acc file.file_theories in
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  f acc (AFile file)

let fold_all_any s f acc any =
  match any with
  | AFile file -> fold_all_any_of_file s f acc file
  | ATh th -> fold_all_any_of_theory s f acc th
  | APn pn -> fold_all_any_of_proofn s f acc pn
  | ATn tn -> fold_all_any_of_transn s f acc tn
  | APa _ -> f acc any

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let fold_all_session s f acc =
  let files = get_files s in
  Hstr.fold (fun _key file acc -> fold_all_any s f acc (AFile file)) files acc

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let rec fold_all_sub_goals_of_proofn s f acc pnid =
  let pn = get_proofNode s pnid in
  let acc =
    List.fold_left
      (fun acc trid ->
         let tr = get_transfNode s trid in
         List.fold_left
           (fold_all_sub_goals_of_proofn s f)
           acc tr.transf_subtasks)
      acc pn.proofn_transformations
  in
  f acc pn

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let goal_iter_proof_attempt s f g =
  fold_all_sub_goals_of_proofn
    s
    (fun _ pn -> Hprover.iter
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                 (fun _ pa ->
                  let pan = get_proof_attempt_node s pa in
                  f pa pan)
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                 pn.proofn_attempts) () g

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let fold_all_sub_goals_of_theory s f acc th =
  List.fold_left (fold_all_sub_goals_of_proofn s f) acc th.theory_goals

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(*
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let theory_iter_proofn s f th =
  fold_all_sub_goals_of_theory s (fun _ -> f) () th
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*)
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let theory_iter_proof_attempt s f th =
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  fold_all_sub_goals_of_theory s
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    (fun _ pn -> Hprover.iter (fun _ pa ->
                             let pan = get_proof_attempt_node s pa in
                             f pa pan)
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         pn.proofn_attempts) () th

let file_iter_proof_attempt s f file =
  List.iter
    (theory_iter_proof_attempt s f)
    (file_theories file)

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let any_iter_proof_attempt s f any =
  match any with
  | AFile file -> file_iter_proof_attempt s f file
  | ATh th -> theory_iter_proof_attempt s f th
  | ATn tr ->
      let subgoals = get_sub_tasks s tr in
      List.iter (fun g -> goal_iter_proof_attempt s f g) subgoals
  | APn pn -> goal_iter_proof_attempt s f pn
  | APa pa -> f pa (get_proof_attempt_node s pa)
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(**************)
(* Copy/Paste *)
(**************)

let get_any_parent s a =
  match a with
  | AFile _f -> None
  | ATh th  -> Some (AFile (theory_parent s th))
  | ATn tr  -> Some (APn (get_trans_parent s tr))
  | APn pn  ->
      (match (get_proofNode s pn).proofn_parent with
      | Theory th -> Some (ATh th)
      | Trans tr -> Some (ATn tr))
  | APa pa  ->
      Some (APn (get_proof_attempt_node s pa).parent)

(* True if bid is an ancestor of aid, false if not *)
let rec is_below s (aid: any) (bid: any) =
  aid = bid ||
  match (get_any_parent s aid) with
  | None     -> false
  | Some pid -> is_below s pid bid

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open Format
open Ident

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let print_proof_attempt fmt pa =
  fprintf fmt "%a tl=%d %a"
          Whyconf.print_prover pa.prover
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          pa.limit.Call_provers.limit_time
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          (Pp.print_option Call_provers.print_prover_result) pa.proof_state

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let rec print_proof_node s (fmt: Format.formatter) p =
  let pn = get_proofNode s p in
  let parent = match pn.proofn_parent with
  | Theory t -> t.theory_name.id_string
  | Trans id -> (get_transfNode s id).transf_name
  in
  fprintf fmt
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    "@[<hv 1> Goal %s;@ parent %s;@ sum %s;@ @[<hv 1>[%a]@]@ @[<hv 1>[%a]@]@]"
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    pn.proofn_name.id_string parent
    (Opt.fold (fun _ a -> Termcode.string_of_checksum a) "None" pn.proofn_checksum)
    (Pp.print_list Pp.semi print_proof_attempt)
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      (Hprover.fold (fun _key e l ->
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                     let e = get_proof_attempt_node s e in
                     e :: l)
        pn.proofn_attempts [])
      (Pp.print_list Pp.semi (print_trans_node s)) pn.proofn_transformations
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and print_trans_node s fmt id =
  let tn = get_transfNode s id in
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  let args = get_transf_args s id in
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  let name = tn.transf_name in
  let l = tn.transf_subtasks in
  let parent = (get_proofNode s tn.transf_parent).proofn_name.id_string in
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  fprintf fmt "@[<hv 1> Trans %s;@ args %a;@ parent %s;@ [%a]@]"
    name (Pp.print_list Pp.colon pp_print_string) args parent
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    (Pp.print_list Pp.semi (print_proof_node s)) l

let print_theory s fmt th : unit =
  fprintf fmt "@[<hv 2> Theory %s;@ [%a]@]" th.theory_name.Ident.id_string
    (Pp.print_list Pp.semi (fun fmt a -> print_proof_node s fmt a)) th.theory_goals

let print_file s fmt (file, thl) =
  fprintf fmt "@[<hv 2> File %s;@ [%a]@]" file.file_name
    (Pp.print_list Pp.semi (print_theory s)) thl

let print_s s fmt =
  fprintf fmt "@[%a@]" (Pp.print_list Pp.semi (print_file s))
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let _print_session fmt s =
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  let l = Hstr.fold (fun _ f acc -> (f,f.file_theories) :: acc) (get_files s) [] in
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  fprintf fmt "%a@." (print_s s) l;;
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let empty_session ?from dir =
  let prover_ids, shape_version =
    match from with
    | Some v -> v.session_prover_ids, v.session_shape_version
    | None -> Hprover.create 7, Termcode.current_shape_version
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  in
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  { proofAttempt_table = Hint.create 97;
    next_proofAttemptID = 0;
    proofNode_table = Hint.create 97;
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    next_proofNodeID = 0;
    trans_table = Hint.create 97;
    next_transID = 0;
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    session_dir = dir;
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    session_files = Hstr.create 3;
    session_shape_version = shape_version;
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    session_prover_ids = prover_ids;
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    session_raw_tasks = Hpn.create 97;
    session_tasks = Hpn.create 97;
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    file_state = Hstr.create 3;
    th_state = Ident.Hid.create 7;
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    tn_state = Htn.create 97;
    pn_state = Hpn.create 97;
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  }

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(**************************************************)
(* proof node/attempt/transformation manipulation *)
(**************************************************)
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exception AlreadyExist

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let add_proof_attempt session prover limit state obsolete edit parentID =
  let pn = get_proofNode session parentID in
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  try
    let _ = Hprover.find pn.proofn_attempts prover in
    raise AlreadyExist
  with Not_found ->
    let id = gen_proofAttemptID session in
    let pa = { parent = parentID;
               prover = prover;
               limit = limit;
               proof_state = state;
               proof_obsolete = obsolete;
               proof_script = edit } in
    Hprover.add pn.proofn_attempts prover id;
    Hint.replace session.proofAttempt_table id pa;
    id
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let graft_proof_attempt ?file (s : session) (id : proofNodeID) (pr : Whyconf.prover)
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    ~limit =
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  let pn = get_proofNode s id in
  try
    let id = Hprover.find pn.proofn_attempts pr in
    let pa = Hint.find s.proofAttempt_table id in
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    let pa = { pa with limit = limit;
               proof_state = None;
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               proof_obsolete = false} in
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    (* Hprover.replace pn.proofn_attempts pr id; useless *)
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    Hint.replace s.proofAttempt_table id pa;
    id
  with Not_found ->
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    add_proof_attempt s pr limit None false file id
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(* [mk_proof_node s n t p id] register in the session [s] a proof node
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   of proofNodeID [id] of parent [p] of task [t] *)
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let mk_proof_node ~version ~expl (s : session) (n : Ident.ident) (t : Task.task)
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    (parent : proof_parent) (node_id : proofNodeID) =
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  (* let tables = Args_wrapper.build_naming_tables t in *)
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  let sum = Some (Termcode.task_checksum ~version t) in
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  let shape = Termcode.t_shape_task ~version ~expl t in
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  let pn = { proofn_name = n;
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             proofn_expl = expl;
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             proofn_parent = parent;
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             proofn_checksum = sum;
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             proofn_shape = shape;
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             proofn_attempts = Hprover.create 7;
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             proofn_transformations = [] } in
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  Hpn.add s.session_raw_tasks node_id t;
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  Hint.add s.proofNode_table node_id pn
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let mk_proof_node_no_task (s : session) (n : Ident.ident)
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    (parent : proof_parent) (node_id : proofNodeID) sum shape proved =
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  let pn = { proofn_name = n;
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             proofn_expl = "";
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             proofn_parent = parent;
             proofn_checksum = sum;
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             proofn_shape = shape;
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             proofn_attempts = Hprover.create 7;
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             proofn_transformations = [] } in
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  Hint.add s.proofNode_table node_id pn;
  Hint.add s.pn_state node_id proved
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let mk_transf_proof_node (s : session) (parent_name : string)
    (tid : transID) (index : int) (t : Task.task) =
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  let id = gen_proofNodeID s in
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  let gid,expl,_ = Termcode.goal_expl_task ~root:false t in
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  let goal_name = parent_name ^ "." ^ string_of_int index in
  let goal_name = Ident.id_register (Ident.id_derive goal_name gid) in
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  mk_proof_node ~version:s.session_shape_version ~expl
                s goal_name t (Trans tid) id;
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  id

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let mk_transf_node (s : session) (id : proofNodeID) (node_id : transID)
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    (name : string) (args : string list) ~(proved:bool) (pnl : proofNodeID list) =
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  let pn = get_proofNode s id in
  let tn = { transf_name = name;
             transf_args = args;
             transf_subtasks = pnl;
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             transf_parent = id;
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           }
  in
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  Hint.add s.trans_table node_id tn;
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  Htn.add s.tn_state node_id proved;
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  pn.proofn_transformations <- node_id::pn.proofn_transformations

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let graft_transf  (s : session) (id : proofNodeID) (name : string)
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    (args : string list) (tl : Task.task list) =
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  let tid = gen_transID s in
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  let parent_name = (get_proofNode s id).proofn_name.Ident.id_string in
  let sub_tasks = List.mapi (mk_transf_proof_node s parent_name tid) tl in
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  let proved = sub_tasks = [] in
  mk_transf_node s id tid name args ~proved sub_tasks;
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  tid
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let update_proof_attempt ?(obsolete=false) notifier s id pr st =
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  try
    let n = get_proofNode s id in
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    let paid = Hprover.find n.proofn_attempts pr in
    let pa = get_proof_attempt_node s paid in
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    pa.proof_state <- Some st;
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    pa.proof_obsolete <- obsolete;
    notifier (APa paid)
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  with
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  | BadID when not (Debug.test_flag debug_stack_trace) -> assert false
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(* proved status *)


let tn_proved s tid = Htn.find_def s.tn_state false tid
let pn_proved s pid = Hpn.find_def s.pn_state false pid
let th_proved s th  =
  try Hid.find s.th_state th.theory_name
  with Not_found ->
    let b = theory_goals th = [] in
    Hid.add s.th_state th.theory_name b;
    b

let file_proved s f =
  try Hstr.find s.file_state f.file_name
  with Not_found ->
    let b = f.file_theories = [] in
    Hstr.add s.file_state f.file_name b;
    b

let any_proved s any : bool =
  match any with
  | AFile file -> file_proved s file
  | ATh th -> th_proved s th
  | ATn tn -> tn_proved s tn
  | APn pn -> pn_proved s pn
  | APa pa ->
      begin
        let pa = get_proof_attempt_node s pa in
        match pa.proof_state with
        | None -> false
        | Some pa ->
          begin
            match pa.Call_provers.pr_answer with
            | Call_provers.Valid -> true
            | _ -> false
          end
      end




(* status update *)


type notifier = any -> unit

let pa_ok pa =
  not pa.proof_obsolete &&
    match pa.proof_state
    with
    | Some { Call_provers.pr_answer = Call_provers.Valid} -> true
    | _ -> false

(* [update_goal_node c id] update the proof status of node id
   update is propagated to parents when required. *)

let update_file_node notification s f =
  let ths = f.file_theories in
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  if ths = [] then
    (* No updates if ths is empty *)
    ()
  else
    let proved = List.for_all (th_proved s) ths in
    if proved <> file_proved s f then
      begin
        Stdlib.Hstr.replace s.file_state f.file_name proved;
        notification (AFile f);
      end
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let update_theory_node notification s th =
  let goals = theory_goals th in
  let proved = List.for_all (pn_proved s) goals in
  if proved <> th_proved s th then
    begin
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      Debug.dprintf debug "[Session] setting theory %s to status proved=%b@."
                    th.theory_name.Ident.id_string proved;
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      Hid.replace s.th_state (theory_name th) proved;
      notification (ATh th);
      try let p = theory_parent s th in
          update_file_node notification s p
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      with Not_found when not (Debug.test_flag Debug.stack_trace) ->
        Format.eprintf "[Fatal] Session_itp.update_theory_node: parent missing@.";
        assert false
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    end

let rec update_goal_node notification s id =
  let tr_list = get_transformations s id in
  let pa_list = get_proof_attempts s id in
  let proved = List.exists (tn_proved s) tr_list || List.exists pa_ok pa_list in
  if proved <> pn_proved s id then
    begin
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      Debug.dprintf debug "[Session] setting goal node %a to status proved=%b@."
                    print_proofNodeID id proved;
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      Hpn.replace s.pn_state id proved;
      notification (APn id);
      match get_proof_parent s id with
      | Trans trans_id -> update_trans_node notification s trans_id
      | Theory th -> update_theory_node notification s th
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      | exception Not_found when not (Debug.test_flag Debug.stack_trace) ->
                  Format.eprintf "Session_itp.update_goal_node: parent missing@.";
                  Printexc.print_backtrace stderr;
                  assert false
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    end

and update_trans_node notification s trid =
  let proof_list = get_sub_tasks s trid in
  let proved = List.for_all (pn_proved s) proof_list in
  if proved <> tn_proved s trid then
    begin
      Htn.replace s.tn_state trid proved;
      notification (ATn trid);
      update_goal_node notification s (get_trans_parent s trid)
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    end;
  (* Specific case in which we *always* need to call notification because
     transformation are created with proved=true when they don't have subtasks.
     This means they won't be updated in the next if so the parent goal will
     never get updated. *)
  if proof_list = [] then
    update_goal_node notification s (get_trans_parent s trid)
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let update_any_node s notification a =
  match a with
  | APn id -> update_goal_node notification s id
  | ATn id -> update_trans_node notification s id
  | APa _ -> assert false
  | AFile f -> update_file_node notification s f
  | ATh th -> update_theory_node notification s th


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let change_prover notification s id opr npr =
  try
    let n = get_proofNode s id in
    let paid = Hprover.find n.proofn_attempts opr in
    let pa = get_proof_attempt_node s paid in
    Hprover.remove n.proofn_attempts opr;
    pa.prover <- npr;
    pa.proof_obsolete <- true;
    Hprover.add n.proofn_attempts npr paid;
    update_goal_node notification s id
  with
  | Not_found -> ()
  | BadID when not (Debug.test_flag debug_stack_trace) -> assert false



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(* Remove elements of the session tree *)

let remove_transformation (s : session) (id : transID) =
  let nt = get_transfNode s id in
  Hint.remove s.trans_table id;
  let pn = get_proofNode s nt.transf_parent in
  let trans_up = List.filter (fun tid -> tid != id) pn.proofn_transformations in
  pn.proofn_transformations <- trans_up

let remove_proof_attempt (s : session) (id : proofNodeID)
    (prover : Whyconf.prover) =
  let pn = get_proofNode s id in
  let pa = Hprover.find pn.proofn_attempts prover in
  Hprover.remove pn.proofn_attempts prover;
  Hint.remove s.proofAttempt_table pa

let remove_proof_attempt_pa s (id: proofAttemptID) =
  let pa = get_proof_attempt_node s id in
  let pn = pa.parent in
  let prover = pa.prover in
  remove_proof_attempt s pn prover

let mark_obsolete s (id: proofAttemptID) =
  let pa = get_proof_attempt_node s id in
  pa.proof_obsolete <- true


exception RemoveError

let remove_subtree ~(notification:notifier) ~(removed:notifier) s (n: any) =
  let remove (n: any) =
    match n with
    | ATn tn -> remove_transformation s tn
    | APa pa -> remove_proof_attempt_pa s pa
    | AFile f -> Hstr.remove s.session_files f.file_name
    | APn pn -> Hint.remove s.proofNode_table pn
    | ATh _th -> (* Not in any table *)  ()
  in
  match n with
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  | (AFile _ | APn _ | ATh _) when not (is_detached s n) ->
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               raise RemoveError
  | _ ->
     let p = get_any_parent s n in
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     fold_all_any s (fun _ x -> remove x; removed x) () n;
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     Opt.iter (update_any_node s notification) p

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(****************************)
(*     session opening      *)
(****************************)

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let db_filename = "why3session.xml"
let shape_filename = "why3shapes"
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let compressed_shape_filename = "why3shapes.gz"
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let session_dir_for_save = ref "."

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exception LoadError of Xml.element * string
exception SessionFileError of string

let bool_attribute field r def =
  try
    match List.assoc field r.Xml.attributes with
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    | "true" -> true
    | "false" -> false
    | _ -> assert false
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  with Not_found -> def

let int_attribute_def field r def =
  try
    int_of_string (List.assoc field r.Xml.attributes)
  with Not_found | Invalid_argument _ -> def

let string_attribute_def field r def=
  try
    List.assoc field r.Xml.attributes
  with Not_found -> def

let string_attribute_opt field r =
  try
    Some (List.assoc field r.Xml.attributes)
  with Not_found -> None

let string_attribute field r =
  try
    List.assoc field r.Xml.attributes
  with Not_found ->
    eprintf "[Error] missing required attribute '%s' from element '%s'@."
      field r.Xml.name;
    assert false

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let default_unknown_result =
     {
       Call_provers.pr_answer = Call_provers.Failure "";
       Call_provers.pr_time = 0.0;
       Call_provers.pr_output = "";
       Call_provers.pr_status = Unix.WEXITED 0;
       Call_provers.pr_steps = -1;
       Call_provers.pr_model = Model_parser.default_model;
     }

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let load_result r =
  match r.Xml.name with
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  | "result" ->
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     let status = string_attribute "status" r in
     let answer =
       match status with
       | "valid" -> Call_provers.Valid
       | "invalid" -> Call_provers.Invalid
       | "unknown" -> Call_provers.Unknown ("", None)
       | "timeout" -> Call_provers.Timeout
       | "outofmemory" -> Call_provers.OutOfMemory
       | "failure" -> Call_provers.Failure ""
       | "highfailure" -> Call_provers.HighFailure
       | "steplimitexceeded" -> Call_provers.StepLimitExceeded
       | "stepslimitexceeded" -> Call_provers.StepLimitExceeded
       | s ->
          Warning.emit
            "[Warning] Session.load_result: unexpected status '%s'@." s;
          Call_provers.HighFailure
     in
     let time =
       try float_of_string (List.assoc "time" r.Xml.attributes)
       with Not_found -> 0.0
     in
     let steps =
       try int_of_string (List.assoc "steps" r.Xml.attributes)
       with Not_found -> -1
     in
     {
       Call_provers.pr_answer = answer;
       Call_provers.pr_time = time;
       Call_provers.pr_output = "";
       Call_provers.pr_status = Unix.WEXITED 0;
       Call_provers.pr_steps = steps;
       Call_provers.pr_model = Model_parser.default_model;
     }
  | "undone" | "unedited" -> default_unknown_result
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  | s ->
    Warning.emit "[Warning] Session.load_result: unexpected element '%s'@."
      s;
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    default_unknown_result
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let load_option attr g =
  try Some (List.assoc attr g.Xml.attributes)
  with Not_found -> None

let load_ident elt =
  let name = string_attribute "name" elt in
  let label = List.fold_left
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      (fun acc label ->
         match label with
         | {Xml.name = "label"} ->
           let lab = string_attribute "name" label in
           Ident.Slab.add (Ident.create_label lab) acc
         | _ -> acc
      ) Ident.Slab.empty elt.Xml.elements in
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  let preid =
    try
      let load_exn attr g = List.assoc attr g.Xml.attributes in
      let file = load_exn "locfile" elt in
      let lnum =  int_of_string (load_exn "loclnum" elt) in
      let cnumb = int_of_string (load_exn "loccnumb" elt) in
      let cnume = int_of_string (load_exn "loccnume" elt) in
      let pos = Loc.user_position file lnum cnumb cnume in
      Ident.id_user ~label name pos
    with Not_found | Invalid_argument _ ->
      Ident.id_fresh ~label name in
  Ident.id_register preid

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(* [load_goal s op p g id] loads the goal of parent [p] from the xml
   [g] of nodeID [id] into the session [s] *)
let rec load_goal session old_provers parent g id =
  match g.Xml.name with
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  | "goal" ->
    let gname = load_ident g in
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    (* even if sum and shape are not in the XML file but in the shape
  file, these attributes are there thanks to ~fixattr on
  Xml.from_file *)
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    let csum = string_attribute_opt "sum" g in
    let sum = Opt.map Termcode.checksum_of_string csum in
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    let shape =
      try Termcode.shape_of_string (List.assoc "shape" g.Xml.attributes)
      with Not_found -> Termcode.shape_of_string ""
    in
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    let proved = bool_attribute "proved" g false in
    mk_proof_node_no_task session gname parent id sum shape proved;
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    List.iter (load_proof_or_transf session old_provers id) g.Xml.elements;
  | "label" -> ()
  | s ->
    Warning.emit "[Warning] Session.load_goal: unexpected element '%s'@." s

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(* [load_proof_or_transf s op pid a] load either a proof attempt or a
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   transformation of parent id [pid] from the xml [a] into the session
   [s] *)
and load_proof_or_transf session old_provers pid a =
  match a.Xml.name with
    | "proof" ->
      begin
        let prover = string_attribute "prover" a in
        try
          let prover = int_of_string prover in
          let (p,timelimit,steplimit,memlimit) = Mint.find prover old_provers in
          let res = match a.Xml.elements with
            | [r] -> load_result r
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            | [] -> default_unknown_result
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            | _ ->
              Warning.emit "[Error] Too many result elements@.";
              raise (LoadError (a,"too many result elements"))
          in
          let edit = load_option "edited" a in
          let edit = match edit with None | Some "" -> None | _ -> edit in
          let obsolete = bool_attribute "obsolete" a false in
          let timelimit = int_attribute_def "timelimit" a timelimit in
	  let steplimit = int_attribute_def "steplimit" a steplimit in
          let memlimit = int_attribute_def "memlimit" a memlimit in
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          let limit = { Call_provers.limit_time  = timelimit;
                        Call_provers.limit_mem   = memlimit;
                        Call_provers.limit_steps = steplimit; }
          in
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          ignore(add_proof_attempt session p limit (Some res) obsolete edit pid)
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        with Failure _ | Not_found ->
          Warning.emit "[Error] prover id not listed in header '%s'@." prover;
          raise (LoadError (a,"prover not listing in header"))
      end
    | "transf" ->
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      let trname = string_attribute "name" a in
      let rec get_args id =
        match string_attribute_opt ("arg"^(string_of_int id)) a with
        | Some arg -> arg :: (get_args (id+1))
        | None -> []
      in
      let args = get_args 1 in
      let tid = gen_transID session in
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      let proved = bool_attribute "proved" a false in
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      let subtasks_ids =
        List.rev (List.fold_left
                    (fun goals th ->
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                       match th.Xml.name with
                       | "goal" -> (gen_proofNodeID session) :: goals
                       | _ -> goals) [] a.Xml.elements)
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      in
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      mk_transf_node session pid tid trname args ~proved subtasks_ids;
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      List.iter2
        (load_goal session old_provers (Trans tid))
        a.Xml.elements subtasks_ids;
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    | "metas" -> ()
    | "label" -> ()
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    | s ->
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      Warning.emit
        "[Warning] Session.load_proof_or_transf: unexpected element '%s'@."
        s
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let load_theory session parent_name old_provers acc th =
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  match th.Xml.name with
  | "theory" ->
    let thname = load_ident th in
    let csum = string_attribute_opt "sum" th in
    let checksum = Opt.map Termcode.checksum_of_string csum in
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    let goals = List.rev (List.fold_left (fun goals th -> match th.Xml.name with
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        | "goal" -> (gen_proofNodeID session) :: goals
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        | _ -> goals) [] th.Xml.elements) in
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    let mth = { theory_name = thname;
                theory_checksum = checksum;
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                theory_is_detached = true;
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                theory_goals = goals;
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                theory_parent_name = parent_name;
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              } in
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    List.iter2
      (load_goal session old_provers (Theory mth))
      th.Xml.elements goals;
    mth::acc
  | s ->
    Warning.emit "[Warning] Session.load_theory: unexpected element '%s'@."
      s;
    acc

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let load_file session old_provers f =
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  match f.Xml.name with
  | "file" ->
    let fn = string_attribute "name" f in
    let fmt = load_option "format" f in
    let ft = List.rev
        (List.fold_left
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           (load_theory session fn old_provers) [] f.Xml.elements) in
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    let mf = { file_name = fn;
               file_format = fmt;
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               file_is_detached = true;
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               file_theories = ft;
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             } in
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    Hstr.add session.session_files fn mf;
    old_provers
  | "prover" ->
    (* The id is just for the session file *)
    let id = string_attribute "id" f in
    begin
      try
        let id = int_of_string id in
        let name = string_attribute "name" f in
        let version = string_attribute "version" f in
        let altern = string_attribute_def "alternative" f "" in
        let timelimit = int_attribute_def "timelimit" f 5 in
        let steplimit = int_attribute_def "steplimit" f 1 in
        let memlimit = int_attribute_def "memlimit" f 1000 in
        let p = {Whyconf.prover_name = name;
                 prover_version = version;
                 prover_altern = altern} in
        Mint.add id (p,timelimit,steplimit,memlimit) old_provers
      with Failure _ ->
        Warning.emit "[Warning] Session.load_file: unexpected non-numeric prover id '%s'@." id;
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        old_provers
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    end
  | s ->
    Warning.emit "[Warning] Session.load_file: unexpected element '%s'@." s;
    old_provers
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let build_session (s : session) xml =
  match xml.Xml.name with