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|
open Pp
open Util
open Names
open Cic
open Term
open Reduction
open Typeops
open Indtypes
open Modops
open Subtyping
open Declarations
open Environ
(** {6 Checking constants } *)
let refresh_arity ar =
let ctxt, hd = decompose_prod_assum ar in
match hd with
Sort (Type u) when not (Univ.is_univ_variable u) ->
let u' = Univ.Universe.make (Univ.Level.make empty_dirpath 1) in
mkArity (ctxt,Prop Null),
Univ.enforce_leq u u' Univ.empty_constraint
| _ -> ar, Univ.empty_constraint
let check_constant_declaration env kn cb =
Flags.if_verbose ppnl (str " checking cst: " ++ prcon kn);
let env = add_constraints (Univ.UContext.constraints cb.const_universes) env in
(match cb.const_type with
RegularArity ty ->
let ty, cu = refresh_arity ty in
let envty = add_constraints cu env in
let _ = infer_type envty ty in
(match body_of_constant cb with
| Some bd ->
let j = infer envty bd in
conv_leq envty j ty
| None -> ())
| TemplateArity(ctxt,par) ->
let _ = check_ctxt env ctxt in
check_polymorphic_arity env ctxt par);
add_constant kn cb env
(** {6 Checking modules } *)
(** We currently ignore the [mod_type_alg] and [typ_expr_alg] fields.
The only delicate part is when [mod_expr] is an algebraic expression :
we need to expand it before checking it is indeed a subtype of [mod_type].
Fortunately, [mod_expr] cannot contain any [MEwith]. *)
let lookup_module mp env =
try Environ.lookup_module mp env
with Not_found ->
failwith ("Unknown module: "^string_of_mp mp)
let rec check_module env mp mb =
let (_:module_signature) =
check_signature env mb.mod_type mb.mod_mp mb.mod_delta
in
let optsign = match mb.mod_expr with
|Struct sign -> Some (check_signature env sign mb.mod_mp mb.mod_delta)
|Algebraic me -> Some (check_mexpression env me mb.mod_mp mb.mod_delta)
|Abstract|FullStruct -> None
in
match optsign with
|None -> ()
|Some sign ->
let mtb1 =
{typ_mp=mp;
typ_expr=sign;
typ_expr_alg=None;
typ_constraints=Univ.Constraint.empty;
typ_delta = mb.mod_delta;}
and mtb2 =
{typ_mp=mp;
typ_expr=mb.mod_type;
typ_expr_alg=None;
typ_constraints=Univ.Constraint.empty;
typ_delta = mb.mod_delta;}
in
let env = add_module_type mp mtb1 env in
Subtyping.check_subtypes env mtb1 mtb2
and check_module_type env mty =
let (_:module_signature) =
check_signature env mty.typ_expr mty.typ_mp mty.typ_delta in
()
and check_structure_field env mp lab res = function
| SFBconst cb ->
let c = Constant.make2 mp lab in
check_constant_declaration env c cb
| SFBmind mib ->
let kn = MutInd.make2 mp lab in
let kn = mind_of_delta res kn in
Indtypes.check_inductive env kn mib
| SFBmodule msb ->
let () = check_module env (MPdot(mp,lab)) msb in
Modops.add_module msb env
| SFBmodtype mty ->
check_module_type env mty;
add_modtype (MPdot(mp,lab)) mty env
and check_mexpr env mse mp_mse res = match mse with
| MEident mp ->
let mb = lookup_module mp env in
(subst_and_strengthen mb mp_mse).mod_type
| MEapply (f,mp) ->
let sign = check_mexpr env f mp_mse res in
let farg_id, farg_b, fbody_b = destr_functor sign in
let mtb = module_type_of_module (Some mp) (lookup_module mp env) in
check_subtypes env mtb farg_b;
subst_signature (map_mbid farg_id mp) fbody_b
| MEwith _ -> error_with_module ()
and check_mexpression env sign mp_mse res = match sign with
| MoreFunctor (arg_id, mtb, body) ->
check_module_type env mtb;
let env' = add_module_type (MPbound arg_id) mtb env in
let body = check_mexpression env' body mp_mse res in
MoreFunctor(arg_id,mtb,body)
| NoFunctor me -> check_mexpr env me mp_mse res
and check_signature env sign mp_mse res = match sign with
| MoreFunctor (arg_id, mtb, body) ->
check_module_type env mtb;
let env' = add_module_type (MPbound arg_id) mtb env in
let body = check_signature env' body mp_mse res in
MoreFunctor(arg_id,mtb,body)
| NoFunctor struc ->
let (_:env) = List.fold_left (fun env (lab,mb) ->
check_structure_field env mp_mse lab res mb) env struc
in
NoFunctor struc
|
