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Diffstat (limited to 'interp/discharge.ml')
| -rw-r--r-- | interp/discharge.ml | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/interp/discharge.ml b/interp/discharge.ml new file mode 100644 index 00000000..e16a955d --- /dev/null +++ b/interp/discharge.ml @@ -0,0 +1,125 @@ +(************************************************************************) +(* * The Coq Proof Assistant / The Coq Development Team *) +(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *) +(* <O___,, * (see CREDITS file for the list of authors) *) +(* \VV/ **************************************************************) +(* // * This file is distributed under the terms of the *) +(* * GNU Lesser General Public License Version 2.1 *) +(* * (see LICENSE file for the text of the license) *) +(************************************************************************) + +open Names +open CErrors +open Util +open Term +open Constr +open Vars +open Declarations +open Cooking +open Entries +open Context.Rel.Declaration + +(********************************) +(* Discharging mutual inductive *) + +let detype_param = + function + | LocalAssum (Name id, p) -> id, LocalAssumEntry p + | LocalDef (Name id, p,_) -> id, LocalDefEntry p + | _ -> anomaly (Pp.str "Unnamed inductive local variable.") + +(* Replace + + Var(y1)..Var(yq):C1..Cq |- Ij:Bj + Var(y1)..Var(yq):C1..Cq; I1..Ip:B1..Bp |- ci : Ti + + by + + |- Ij: (y1..yq:C1..Cq)Bj + I1..Ip:(B1 y1..yq)..(Bp y1..yq) |- ci : (y1..yq:C1..Cq)Ti[Ij:=(Ij y1..yq)] +*) + +let abstract_inductive decls nparamdecls inds = + let ntyp = List.length inds in + let ndecls = Context.Named.length decls in + let args = Context.Named.to_instance mkVar (List.rev decls) in + let args = Array.of_list args in + let subs = List.init ntyp (fun k -> lift ndecls (mkApp(mkRel (k+1),args))) in + let inds' = + List.map + (function (tname,arity,template,cnames,lc) -> + let lc' = List.map (substl subs) lc in + let lc'' = List.map (fun b -> Termops.it_mkNamedProd_wo_LetIn b decls) lc' in + let arity' = Termops.it_mkNamedProd_wo_LetIn arity decls in + (tname,arity',template,cnames,lc'')) + inds in + let nparamdecls' = nparamdecls + Array.length args in +(* To be sure to be the same as before, should probably be moved to process_inductive *) + let params' = let (_,arity,_,_,_) = List.hd inds' in + let (params,_) = decompose_prod_n_assum nparamdecls' arity in + List.map detype_param params + in + let ind'' = + List.map + (fun (a,arity,template,c,lc) -> + let _, short_arity = decompose_prod_n_assum nparamdecls' arity in + let shortlc = + List.map (fun c -> snd (decompose_prod_n_assum nparamdecls' c)) lc in + { mind_entry_typename = a; + mind_entry_arity = short_arity; + mind_entry_template = template; + mind_entry_consnames = c; + mind_entry_lc = shortlc }) + inds' + in (params',ind'') + +let refresh_polymorphic_type_of_inductive (_,mip) = + match mip.mind_arity with + | RegularArity s -> s.mind_user_arity, false + | TemplateArity ar -> + let ctx = List.rev mip.mind_arity_ctxt in + mkArity (List.rev ctx, Type ar.template_level), true + +let process_inductive info modlist mib = + let section_decls = Lib.named_of_variable_context info.Lib.abstr_ctx in + let nparamdecls = Context.Rel.length mib.mind_params_ctxt in + let subst, ind_univs = + match mib.mind_universes with + | Monomorphic_ind ctx -> Univ.empty_level_subst, Monomorphic_ind_entry ctx + | Polymorphic_ind auctx -> + let subst, auctx = Lib.discharge_abstract_universe_context info auctx in + let auctx = Univ.AUContext.repr auctx in + subst, Polymorphic_ind_entry auctx + | Cumulative_ind cumi -> + let auctx = Univ.ACumulativityInfo.univ_context cumi in + let subst, auctx = Lib.discharge_abstract_universe_context info auctx in + let auctx = Univ.AUContext.repr auctx in + subst, Cumulative_ind_entry (Univ.CumulativityInfo.from_universe_context auctx) + in + let discharge c = Vars.subst_univs_level_constr subst (expmod_constr modlist c) in + let inds = + Array.map_to_list + (fun mip -> + let ty, template = refresh_polymorphic_type_of_inductive (mib,mip) in + let arity = discharge ty in + let lc = Array.map discharge mip.mind_user_lc in + (mip.mind_typename, + arity, template, + Array.to_list mip.mind_consnames, + Array.to_list lc)) + mib.mind_packets in + let section_decls' = Context.Named.map discharge section_decls in + let (params',inds') = abstract_inductive section_decls' nparamdecls inds in + let record = match mib.mind_record with + | Some (Some (id, _, _)) -> Some (Some id) + | Some None -> Some None + | None -> None + in + { mind_entry_record = record; + mind_entry_finite = mib.mind_finite; + mind_entry_params = params'; + mind_entry_inds = inds'; + mind_entry_private = mib.mind_private; + mind_entry_universes = ind_univs + } + |