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
|
(************************************************************************)
(* 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 Util
open Sigma.Notations
open Proofview.Notations
open Context.Named.Declaration
module NamedDecl = Context.Named.Declaration
let extract_prefix env info =
let ctx1 = List.rev (Environ.named_context env) in
let ctx2 = List.rev (Evd.evar_context info) in
let rec share l1 l2 accu = match l1, l2 with
| d1 :: l1, d2 :: l2 ->
if d1 == d2 then share l1 l2 (d1 :: accu)
else (accu, d2 :: l2)
| _ -> (accu, l2)
in
share ctx1 ctx2 []
let typecheck_evar ev env sigma =
let info = Evd.find sigma ev in
(** Typecheck the hypotheses. *)
let type_hyp (sigma, env) decl =
let t = EConstr.of_constr (NamedDecl.get_type decl) in
let evdref = ref sigma in
let _ = Typing.e_sort_of env evdref t in
let () = match decl with
| LocalAssum _ -> ()
| LocalDef (_,body,_) -> Typing.e_check env evdref (EConstr.of_constr body) t
in
(!evdref, Environ.push_named decl env)
in
let (common, changed) = extract_prefix env info in
let env = Environ.reset_with_named_context (Environ.val_of_named_context common) env in
let (sigma, env) = List.fold_left type_hyp (sigma, env) changed in
(** Typecheck the conclusion *)
let evdref = ref sigma in
let _ = Typing.e_sort_of env evdref (EConstr.of_constr (Evd.evar_concl info)) in
!evdref
let typecheck_proof c concl env sigma =
let evdref = ref sigma in
let () = Typing.e_check env evdref c concl in
!evdref
let (pr_constrv,pr_constr) =
Hook.make ~default:(fun _env _sigma _c -> Pp.str"<constr>") ()
(* Get the side-effect's constant declarations to update the monad's
* environmnent *)
let add_if_undefined kn cb env =
try ignore(Environ.lookup_constant kn env); env
with Not_found -> Environ.add_constant kn cb env
(* Add the side effects to the monad's environment, if not already done. *)
let add_side_effect env = function
| { Entries.eff = Entries.SEsubproof (kn, cb, eff_env) } ->
add_if_undefined kn cb env
| { Entries.eff = Entries.SEscheme (l,_) } ->
List.fold_left (fun env (_,kn,cb,eff_env) ->
add_if_undefined kn cb env) env l
let add_side_effects env effects =
List.fold_left (fun env eff -> add_side_effect env eff) env effects
let make_refine_enter ?(unsafe = true) f =
{ enter = fun gl ->
let gl = Proofview.Goal.assume gl in
let sigma = Proofview.Goal.sigma gl in
let sigma = Sigma.to_evar_map sigma in
let env = Proofview.Goal.env gl in
let concl = Proofview.Goal.concl gl in
(** Save the [future_goals] state to restore them after the
refinement. *)
let prev_future_goals = Evd.future_goals sigma in
let prev_principal_goal = Evd.principal_future_goal sigma in
(** Create the refinement term *)
let ((v,c), sigma) = Sigma.run (Evd.reset_future_goals sigma) f in
let evs = Evd.future_goals sigma in
let evkmain = Evd.principal_future_goal sigma in
(** Redo the effects in sigma in the monad's env *)
let privates_csts = Evd.eval_side_effects sigma in
let sideff = Safe_typing.side_effects_of_private_constants privates_csts in
let env = add_side_effects env sideff in
(** Check that the introduced evars are well-typed *)
let fold accu ev = typecheck_evar ev env accu in
let sigma = if unsafe then sigma else CList.fold_left fold sigma evs in
(** Check that the refined term is typesafe *)
let sigma = if unsafe then sigma else typecheck_proof c concl env sigma in
(** Check that the goal itself does not appear in the refined term *)
let self = Proofview.Goal.goal gl in
let _ =
if not (Evarutil.occur_evar_upto sigma self c) then ()
else Pretype_errors.error_occur_check env sigma self c
in
(** Proceed to the refinement *)
let c = EConstr.Unsafe.to_constr c in
let sigma = match evkmain with
| None -> Evd.define self c sigma
| Some evk ->
let id = Evd.evar_ident self sigma in
let sigma = Evd.define self c sigma in
match id with
| None -> sigma
| Some id -> Evd.rename evk id sigma
in
(** Restore the [future goals] state. *)
let sigma = Evd.restore_future_goals sigma prev_future_goals prev_principal_goal in
(** Select the goals *)
let comb = CList.map_filter (Proofview.Unsafe.advance sigma) (CList.rev evs) in
let sigma = CList.fold_left Proofview.Unsafe.mark_as_goal sigma comb in
let trace () = Pp.(hov 2 (str"simple refine"++spc()++ Hook.get pr_constrv env sigma c)) in
Proofview.Trace.name_tactic trace (Proofview.tclUNIT v) >>= fun v ->
Proofview.Unsafe.tclSETENV (Environ.reset_context env) <*>
Proofview.Unsafe.tclEVARS sigma <*>
Proofview.Unsafe.tclSETGOALS comb <*>
Proofview.tclUNIT v
}
let refine_one ?(unsafe = true) f =
Proofview.Goal.enter_one (make_refine_enter ~unsafe f)
let refine ?(unsafe = true) f =
let f = { run = fun sigma -> let Sigma (c,sigma,p) = f.run sigma in Sigma (((),c),sigma,p) } in
Proofview.Goal.enter (make_refine_enter ~unsafe f)
(** Useful definitions *)
let with_type env evd c t =
let my_type = Retyping.get_type_of env evd c in
let j = Environ.make_judge c my_type in
let (evd,j') =
Coercion.inh_conv_coerce_to true (Loc.ghost) env evd j t
in
evd , j'.Environ.uj_val
let refine_casted ?unsafe f = Proofview.Goal.enter { enter = begin fun gl ->
let gl = Proofview.Goal.assume gl in
let concl = Proofview.Goal.concl gl in
let env = Proofview.Goal.env gl in
let f = { run = fun h ->
let Sigma (c, h, p) = f.run h in
let sigma, c = with_type env (Sigma.to_evar_map h) c concl in
Sigma (c, Sigma.Unsafe.of_evar_map sigma, p)
} in
refine ?unsafe f
end }
(** {7 solve_constraints}
Ensure no remaining unification problems are left. Run at every "." by default. *)
let solve_constraints =
let open Proofview in
tclENV >>= fun env -> tclEVARMAP >>= fun sigma ->
try let sigma = Evarconv.solve_unif_constraints_with_heuristics env sigma in
Unsafe.tclEVARSADVANCE sigma
with e -> tclZERO e
|
