aboutsummaryrefslogtreecommitdiffhomepage
path: root/plugins/firstorder/sequent.ml
blob: 3e8033da0727ddf9cd4a3564d2657d17fb4b964f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016     *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

open Term
open Errors
open Util
open Formula
open Unify
open Tacmach
open Globnames
open Pp

let newcnt ()=
  let cnt=ref (-1) in
    fun b->if b then incr cnt;!cnt

let priority = (* pure heuristics, <=0 for non reversible *)
  function
      Right rf->
	begin
	  match rf with
	      Rarrow               -> 100
	    | Rand                 ->  40
	    | Ror                  -> -15
	    | Rfalse               -> -50
	    | Rforall              -> 100
	    | Rexists (_,_,_)      -> -29
	end
    | Left lf ->
	match lf with
	    Lfalse                 -> 999
	  | Land _                 ->  90
	  | Lor _                  ->  40
	  | Lforall (_,_,_)        -> -30
	  | Lexists _              ->  60
	  | LA(_,lap) ->
	      match lap with
		  LLatom           ->   0
		| LLfalse (_,_)    -> 100
		| LLand (_,_)      ->  80
		| LLor (_,_)       ->  70
		| LLforall _       -> -20
		| LLexists (_,_)   ->  50
		| LLarrow  (_,_,_) -> -10

module OrderedFormula=
struct
  type t=Formula.t
  let compare e1 e2=
	(priority e1.pat) - (priority e2.pat)
end

module OrderedConstr=
struct
  type t=constr
  let compare=constr_ord
end

type h_item = global_reference * (int*constr) option

module Hitem=
struct
  type t = h_item
  let compare (id1,co1) (id2,co2)=
    let c = Globnames.RefOrdered.compare id1 id2 in
    if c = 0 then
      let cmp (i1, c1) (i2, c2) =
        let c = Int.compare i1 i2 in
        if c = 0 then OrderedConstr.compare c1 c2 else c
      in
      Option.compare cmp co1 co2
    else c
end

module CM=Map.Make(OrderedConstr)

module History=Set.Make(Hitem)

let cm_add typ nam cm=
  try
    let l=CM.find typ cm in CM.add typ (nam::l) cm
  with
      Not_found->CM.add typ [nam] cm

let cm_remove typ nam cm=
  try
    let l=CM.find typ cm in
    let l0=List.filter (fun id-> not (Globnames.eq_gr id nam)) l in
      match l0 with
	  []->CM.remove typ cm
	| _ ->CM.add typ l0 cm
      with Not_found ->cm

module HP=Heap.Functional(OrderedFormula)

type t=
    {redexes:HP.t;
     context:(global_reference list) CM.t;
     latoms:constr list;
     gl:types;
     glatom:constr option;
     cnt:counter;
     history:History.t;
     depth:int}

let deepen seq={seq with depth=seq.depth-1}

let record item seq={seq with history=History.add item seq.history}

let lookup item seq=
  History.mem item seq.history ||
  match item with
      (_,None)->false
    | (id,Some ((m,t) as c))->
	let p (id2,o)=
	  match o with
	      None -> false
	    | Some ((m2,t2) as c2)-> Globnames.eq_gr id id2 && m2>m && more_general c2 c in
	  History.exists p seq.history

let add_formula side nam t seq gl=
  match build_formula side nam t gl seq.cnt with
      Left f->
	begin
	  match side with
	      Concl ->
		{seq with
		   redexes=HP.add f seq.redexes;
		   gl=f.constr;
		   glatom=None}
	    | _ ->
		{seq with
		   redexes=HP.add f seq.redexes;
		   context=cm_add f.constr nam seq.context}
	end
    | Right t->
	match side with
	    Concl ->
	      {seq with gl=t;glatom=Some t}
	  | _ ->
	      {seq with
		 context=cm_add t nam seq.context;
		 latoms=t::seq.latoms}

let re_add_formula_list lf seq=
  let do_one f cm=
    if f.id == dummy_id then cm
    else cm_add f.constr f.id cm in
  {seq with
     redexes=List.fold_right HP.add lf seq.redexes;
     context=List.fold_right do_one lf seq.context}

let find_left t seq=List.hd (CM.find t seq.context)

(*let rev_left seq=
  try
    let lpat=(HP.maximum seq.redexes).pat in
      left_reversible lpat
  with Heap.EmptyHeap -> false
*)

let rec take_formula seq=
  let hd=HP.maximum seq.redexes
  and hp=HP.remove seq.redexes in
    if hd.id == dummy_id then
      let nseq={seq with redexes=hp} in
	if seq.gl==hd.constr then
	  hd,nseq
	else
	  take_formula nseq (* discarding deprecated goal *)
    else
      hd,{seq with
	    redexes=hp;
	    context=cm_remove hd.constr hd.id seq.context}

let empty_seq depth=
  {redexes=HP.empty;
   context=CM.empty;
   latoms=[];
   gl=(mkMeta 1);
   glatom=None;
   cnt=newcnt ();
   history=History.empty;
   depth=depth}

let expand_constructor_hints =
  List.map_append (function
    | IndRef ind ->
        List.init (Inductiveops.nconstructors ind)
          (fun i -> ConstructRef (ind,i+1))
    | gr ->
	[gr])

let extend_with_ref_list l seq gl =
  let l = expand_constructor_hints l in
  let f gr (seq,gl) =
    let gl, c = pf_eapply Evd.fresh_global gl gr in
    let typ=(pf_unsafe_type_of gl c) in
      (add_formula Hyp gr typ seq gl,gl) in
    List.fold_right f l (seq,gl)

open Hints

let extend_with_auto_hints l seq gl=
  let seqref=ref seq in
  let f p_a_t =
    match repr_hint p_a_t.code with
	Res_pf (c,_) | Give_exact (c,_)
      | Res_pf_THEN_trivial_fail (c,_) ->
          let (c, _, _) = c in
	  (try
	     let gr = global_of_constr c in
	     let typ=(pf_unsafe_type_of gl c) in
	       seqref:=add_formula Hint gr typ !seqref gl
	   with Not_found->())
      | _-> () in
  let g _ _ l = List.iter f l in
  let h dbname=
    let hdb=
      try
	searchtable_map dbname
      with Not_found->
	error ("Firstorder: "^dbname^" : No such Hint database") in
      Hint_db.iter g hdb in
    List.iter h l;
    !seqref, gl (*FIXME: forgetting about universes*)

let print_cmap map=
  let print_entry c l s=
    let xc=Constrextern.extern_constr false (Global.env ()) Evd.empty c in
      str "| " ++
      prlist Printer.pr_global l ++
      str " : " ++
      Ppconstr.pr_constr_expr xc ++
      cut () ++
      s in
    (v 0
	     (str "-----" ++
	      cut () ++
	      CM.fold print_entry map (mt ()) ++
	      str "-----"))