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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
open Util
open Pp
open Term
open Vars
open Context
(* This module implements the abstract interface to goals *)
(* A general invariant of the module, is that a goal whose associated
evar is defined in the current evar_map, should not be accessed. *)
(* type of the goals *)
type goal = Evd.evar
let pr_goal e = str "GOAL:" ++ Pp.int (Evar.repr e)
let uid e = string_of_int (Evar.repr e)
let get_by_uid u = Evar.unsafe_of_int (int_of_string u)
(* Layer to implement v8.2 tactic engine ontop of the new architecture.
Types are different from what they used to be due to a change of the
internal types. *)
module V82 = struct
(* Old style env primitive *)
let env evars gl =
let evi = Evd.find evars gl in
Evd.evar_filtered_env evi
(* Old style hyps primitive *)
let hyps evars gl =
let evi = Evd.find evars gl in
Evd.evar_filtered_hyps evi
(* same as [hyps], but ensures that existential variables are
normalised. *)
let nf_hyps evars gl =
let hyps = Environ.named_context_of_val (hyps evars gl) in
Environ.val_of_named_context (Evarutil.nf_named_context_evar evars hyps)
(* Access to ".evar_concl" *)
let concl evars gl =
let evi = Evd.find evars gl in
evi.Evd.evar_concl
(* Access to ".evar_extra" *)
let extra evars gl =
let evi = Evd.find evars gl in
evi.Evd.evar_extra
(* Old style mk_goal primitive *)
let mk_goal evars hyps concl extra =
(* A goal created that way will not be used by refine and will not
be shelved. It must not appear as a future_goal, so the future
goals are restored to their initial value after the evar is
created. *)
let prev_future_goals = Evd.future_goals evars in
let prev_principal_goal = Evd.principal_future_goal evars in
let evi = { Evd.evar_hyps = hyps;
Evd.evar_concl = concl;
Evd.evar_filter = Evd.Filter.identity;
Evd.evar_body = Evd.Evar_empty;
Evd.evar_source = (Loc.ghost,Evar_kinds.GoalEvar);
Evd.evar_candidates = None;
Evd.evar_extra = extra }
in
let evi = Typeclasses.mark_unresolvable evi in
let (evars, evk) = Evarutil.new_pure_evar_full evars evi in
let evars = Evd.restore_future_goals evars prev_future_goals prev_principal_goal in
let ctxt = Environ.named_context_of_val hyps in
let inst = Array.map_of_list (fun (id, _, _) -> mkVar id) ctxt in
let ev = Term.mkEvar (evk,inst) in
(evk, ev, evars)
(* Instantiates a goal with an open term *)
let partial_solution sigma evk c =
(* Check that the goal itself does not appear in the refined term *)
let _ =
if not (Evarutil.occur_evar_upto sigma evk c) then ()
else Pretype_errors.error_occur_check Environ.empty_env sigma evk c
in
Evd.define evk c sigma
(* Instantiates a goal with an open term, using name of goal for evk' *)
let partial_solution_to sigma evk evk' c =
let id = Evd.evar_ident evk sigma in
Evd.rename evk' id (partial_solution sigma evk c)
(* Parts of the progress tactical *)
let same_goal evars1 gl1 evars2 gl2 =
let evi1 = Evd.find evars1 gl1 in
let evi2 = Evd.find evars2 gl2 in
Term.eq_constr evi1.Evd.evar_concl evi2.Evd.evar_concl &&
Environ.eq_named_context_val evi1.Evd.evar_hyps evi2.Evd.evar_hyps
let weak_progress glss gls =
match glss.Evd.it with
| [ g ] -> not (same_goal glss.Evd.sigma g gls.Evd.sigma gls.Evd.it)
| _ -> true
let progress glss gls =
weak_progress glss gls
(* spiwack: progress normally goes like this:
(Evd.progress_evar_map gls.Evd.sigma glss.Evd.sigma) || (weak_progress glss gls)
This is immensly slow in the current implementation. Maybe we could
reimplement progress_evar_map with restricted folds like "fold_undefined",
with a good implementation of them.
*)
(* Used for congruence closure *)
let new_goal_with sigma gl extra_hyps =
let evi = Evd.find sigma gl in
let hyps = evi.Evd.evar_hyps in
let new_hyps =
List.fold_right Environ.push_named_context_val extra_hyps hyps in
let filter = evi.Evd.evar_filter in
let new_filter = Evd.Filter.extend (List.length extra_hyps) filter in
let new_evi =
{ evi with Evd.evar_hyps = new_hyps; Evd.evar_filter = new_filter } in
let new_evi = Typeclasses.mark_unresolvable new_evi in
let (new_sigma, evk) = Evarutil.new_pure_evar_full Evd.empty new_evi in
{ Evd.it = evk ; sigma = new_sigma; }
(* Used by the compatibility layer and typeclasses *)
let nf_evar sigma gl =
let evi = Evd.find sigma gl in
let evi = Evarutil.nf_evar_info sigma evi in
let sigma = Evd.add sigma gl evi in
(gl, sigma)
(* Goal represented as a type, doesn't take into account section variables *)
let abstract_type sigma gl =
let (gl,sigma) = nf_evar sigma gl in
let env = env sigma gl in
let genv = Global.env () in
let is_proof_var decl =
try ignore (Environ.lookup_named (Util.pi1 decl) genv); false
with Not_found -> true in
Environ.fold_named_context_reverse (fun t decl ->
if is_proof_var decl then
mkNamedProd_or_LetIn decl t
else
t
) ~init:(concl sigma gl) env
end
|
