diff options
Diffstat (limited to 'kernel/subtyping.ml')
| -rw-r--r-- | kernel/subtyping.ml | 255 |
1 files changed, 78 insertions, 177 deletions
diff --git a/kernel/subtyping.ml b/kernel/subtyping.ml index c8ceb064..2e9a33a9 100644 --- a/kernel/subtyping.ml +++ b/kernel/subtyping.ml @@ -1,9 +1,11 @@ (************************************************************************) -(* v * The Coq Proof Assistant / The Coq Development Team *) -(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *) +(* * 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 *) +(* // * 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) *) (************************************************************************) (* Created by Jacek Chrzaszcz, Aug 2002 as part of the implementation of @@ -12,10 +14,10 @@ (* This module checks subtyping of module types *) (*i*) -open Util open Names open Univ -open Term +open Util +open Constr open Declarations open Declareops open Reduction @@ -63,11 +65,11 @@ let empty_labmap = { objs = Label.Map.empty; mods = Label.Map.empty } let get_obj mp map l = try Label.Map.find l map.objs - with Not_found -> error_no_such_label_sub l (string_of_mp mp) + with Not_found -> error_no_such_label_sub l (ModPath.to_string mp) let get_mod mp map l = try Label.Map.find l map.mods - with Not_found -> error_no_such_label_sub l (string_of_mp mp) + with Not_found -> error_no_such_label_sub l (ModPath.to_string mp) let make_labmap mp list = let add_one (l,e) map = @@ -77,19 +79,26 @@ let make_labmap mp list = | SFBmodule mb -> { map with mods = Label.Map.add l (Module mb) map.mods } | SFBmodtype mtb -> { map with mods = Label.Map.add l (Modtype mtb) map.mods } in - List.fold_right add_one list empty_labmap + CList.fold_right add_one list empty_labmap -let check_conv_error error why cst poly u f env a1 a2 = +let check_conv_error error why cst poly f env a1 a2 = try - let a1 = Vars.subst_instance_constr u a1 in - let a2 = Vars.subst_instance_constr u a2 in let cst' = f env (Environ.universes env) a1 a2 in if poly then if Constraint.is_empty cst' then cst else error (IncompatiblePolymorphism (env, a1, a2)) else Constraint.union cst cst' with NotConvertible -> error why + | Univ.UniverseInconsistency e -> error (IncompatibleUniverses e) + +let check_polymorphic_instance error env auctx1 auctx2 = + if not (Univ.AUContext.size auctx1 == Univ.AUContext.size auctx2) then + error IncompatibleInstances + else if not (UGraph.check_subtype (Environ.universes env) auctx2 auctx1) then + error (IncompatibleConstraints auctx1) + else + Environ.push_context ~strict:false (Univ.AUContext.repr auctx2) env (* for now we do not allow reorderings *) @@ -97,58 +106,39 @@ let check_inductive cst env mp1 l info1 mp2 mib2 spec2 subst1 subst2 reso1 reso2 let kn1 = KerName.make2 mp1 l in let kn2 = KerName.make2 mp2 l in let error why = error_signature_mismatch l spec2 why in - let check_conv why cst poly u f = check_conv_error error why cst poly u f in + let check_conv why cst poly f = check_conv_error error why cst poly f in let mib1 = match info1 with | IndType ((_,0), mib) -> Declareops.subst_mind_body subst1 mib | _ -> error (InductiveFieldExpected mib2) in - let poly = - if not (mib1.mind_polymorphic == mib2.mind_polymorphic) then - error (PolymorphicStatusExpected mib2.mind_polymorphic) - else mib2.mind_polymorphic - in - let u = - if poly then - CErrors.error ("Checking of subtyping of polymorphic" ^ - " inductive types not implemented") - else Instance.empty + let env, inst = + match mib1.mind_universes, mib2.mind_universes with + | Monomorphic_ind _, Monomorphic_ind _ -> env, Univ.Instance.empty + | Polymorphic_ind auctx, Polymorphic_ind auctx' -> + let env = check_polymorphic_instance error env auctx auctx' in + env, Univ.make_abstract_instance auctx' + | Cumulative_ind cumi, Cumulative_ind cumi' -> + (** Currently there is no way to control variance of inductive types, but + just in case we require that they are in a subtyping relation. *) + let () = + let v = ACumulativityInfo.variance cumi in + let v' = ACumulativityInfo.variance cumi' in + if not (Array.for_all2 Variance.check_subtype v' v) then + CErrors.anomaly Pp.(str "Variance of " ++ KerName.print kn1 ++ + str " is not compatible with the one of " ++ KerName.print kn2) + in + let auctx = Univ.ACumulativityInfo.univ_context cumi in + let auctx' = Univ.ACumulativityInfo.univ_context cumi' in + let env = check_polymorphic_instance error env auctx auctx' in + env, Univ.make_abstract_instance auctx' + | _ -> error + (CumulativeStatusExpected (Declareops.inductive_is_cumulative mib2)) in let mib2 = Declareops.subst_mind_body subst2 mib2 in - let check_inductive_type cst name env t1 t2 = - - (* Due to sort-polymorphism in inductive types, the conclusions of - t1 and t2, if in Type, are generated as the least upper bounds - of the types of the constructors. - - By monotonicity of the infered l.u.b. wrt subtyping (i.e. if X:U - |- T(X):s and |- M:U' and U'<=U then infer_type(T(M))<=s), each - universe in the conclusion of t1 has an bounding universe in - the conclusion of t2, so that we don't need to check the - subtyping of the conclusions of t1 and t2. - - Even if we'd like to recheck it, the inference of constraints - is not designed to deal with algebraic constraints of the form - max-univ(u1..un) <= max-univ(u'1..u'n), so that it is not easy - to recheck it (in short, we would need the actual graph of - constraints as input while type checking is currently designed - to output a set of constraints instead) *) - - (* So we cheat and replace the subtyping problem on algebraic - constraints of the form max-univ(u1..un) <= max-univ(u'1..u'n) - (that we know are necessary true) by trivial constraints that - the constraint generator knows how to deal with *) - - let (ctx1,s1) = dest_arity env t1 in - let (ctx2,s2) = dest_arity env t2 in - let s1,s2 = - match s1, s2 with - | Type _, Type _ -> (* shortcut here *) prop_sort, prop_sort - | (Prop _, Type _) | (Type _,Prop _) -> - error (NotConvertibleInductiveField name) - | _ -> (s1, s2) in + let check_inductive_type cst name t1 t2 = check_conv (NotConvertibleInductiveField name) - cst poly u infer_conv_leq env (mkArity (ctx1,s1)) (mkArity (ctx2,s2)) + cst (inductive_is_polymorphic mib1) infer_conv_leq env t1 t2 in let check_packet cst p1 p2 = @@ -166,24 +156,23 @@ let check_inductive cst env mp1 l info1 mp2 mib2 spec2 subst1 subst2 reso1 reso2 (* nparams done *) (* params_ctxt done because part of the inductive types *) (* Don't check the sort of the type if polymorphic *) - let ty1, cst1 = constrained_type_of_inductive env ((mib1,p1),u) in - let ty2, cst2 = constrained_type_of_inductive env ((mib2,p2),u) in - let cst = Constraint.union cst1 (Constraint.union cst2 cst) in - let cst = check_inductive_type cst p2.mind_typename env ty1 ty2 in + let ty1 = type_of_inductive env ((mib1, p1), inst) in + let ty2 = type_of_inductive env ((mib2, p2), inst) in + let cst = check_inductive_type cst p2.mind_typename ty1 ty2 in cst in - let mind = mind_of_kn kn1 in + let mind = MutInd.make1 kn1 in let check_cons_types i cst p1 p2 = Array.fold_left3 (fun cst id t1 t2 -> check_conv (NotConvertibleConstructorField id) cst - poly u infer_conv env t1 t2) + (inductive_is_polymorphic mib1) infer_conv env t1 t2) cst p2.mind_consnames - (arities_of_specif (mind,u) (mib1,p1)) - (arities_of_specif (mind,u) (mib2,p2)) + (arities_of_specif (mind, inst) (mib1, p1)) + (arities_of_specif (mind, inst) (mib2, p2)) in let check f test why = if not (test (f mib1) (f mib2)) then error (why (f mib2)) in - check (fun mib -> mib.mind_finite<>Decl_kinds.CoFinite) (==) (fun x -> FiniteInductiveFieldExpected x); + check (fun mib -> mib.mind_finite<>CoFinite) (==) (fun x -> FiniteInductiveFieldExpected x); check (fun mib -> mib.mind_ntypes) Int.equal (fun x -> InductiveNumbersFieldExpected x); assert (List.is_empty mib1.mind_hyps && List.is_empty mib2.mind_hyps); assert (Array.length mib1.mind_packets >= 1 @@ -207,7 +196,7 @@ let check_inductive cst env mp1 l info1 mp2 mib2 spec2 subst1 subst2 reso1 reso2 (* we check that records and their field names are preserved. *) check (fun mib -> mib.mind_record <> None) (==) (fun x -> RecordFieldExpected x); if mib1.mind_record <> None then begin - let rec names_prod_letin t = match kind_of_term t with + let rec names_prod_letin t = match kind t with | Prod(n,_,t) -> n::(names_prod_letin t) | LetIn(n,_,_,t) -> n::(names_prod_letin t) | Cast(t,_,_) -> names_prod_letin t @@ -236,55 +225,10 @@ let check_inductive cst env mp1 l info1 mp2 mib2 spec2 subst1 subst2 reso1 reso2 let check_constant cst env mp1 l info1 cb2 spec2 subst1 subst2 = let error why = error_signature_mismatch l spec2 why in - let check_conv cst poly u f = check_conv_error error cst poly u f in - let check_type poly u cst env t1 t2 = - + let check_conv cst poly f = check_conv_error error cst poly f in + let check_type poly cst env t1 t2 = let err = NotConvertibleTypeField (env, t1, t2) in - - (* If the type of a constant is generated, it may mention - non-variable algebraic universes that the general conversion - algorithm is not ready to handle. Anyway, generated types of - constants are functions of the body of the constant. If the - bodies are the same in environments that are subtypes one of - the other, the types are subtypes too (i.e. if Gamma <= Gamma', - Gamma |- A |> T, Gamma |- A' |> T' and Gamma |- A=A' then T <= T'). - Hence they don't have to be checked again *) - - let t1,t2 = - if isArity t2 then - let (ctx2,s2) = destArity t2 in - match s2 with - | Type v when not (is_univ_variable v) -> - (* The type in the interface is inferred and is made of algebraic - universes *) - begin try - let (ctx1,s1) = dest_arity env t1 in - match s1 with - | Type u when not (is_univ_variable u) -> - (* Both types are inferred, no need to recheck them. We - cheat and collapse the types to Prop *) - mkArity (ctx1,prop_sort), mkArity (ctx2,prop_sort) - | Prop _ -> - (* The type in the interface is inferred, it may be the case - that the type in the implementation is smaller because - the body is more reduced. We safely collapse the upper - type to Prop *) - mkArity (ctx1,prop_sort), mkArity (ctx2,prop_sort) - | Type _ -> - (* The type in the interface is inferred and the type in the - implementation is not inferred or is inferred but from a - more reduced body so that it is just a variable. Since - constraints of the form "univ <= max(...)" are not - expressible in the system of algebraic universes: we fail - (the user has to use an explicit type in the interface *) - error NoTypeConstraintExpected - with NotArity -> - error err end - | _ -> - t1,t2 - else - (t1,t2) in - check_conv err cst poly u infer_conv_leq env t1 t2 + check_conv err cst poly infer_conv_leq env t1 t2 in match info1 with | Constant cb1 -> @@ -292,43 +236,21 @@ let check_constant cst env mp1 l info1 cb2 spec2 subst1 subst2 = let cb1 = Declareops.subst_const_body subst1 cb1 in let cb2 = Declareops.subst_const_body subst2 cb2 in (* Start by checking universes *) - let poly = - if not (cb1.const_polymorphic == cb2.const_polymorphic) then - error (PolymorphicStatusExpected cb2.const_polymorphic) - else cb2.const_polymorphic - in - let cst', env', u = - if poly then - let ctx1 = Univ.instantiate_univ_context cb1.const_universes in - let ctx2 = Univ.instantiate_univ_context cb2.const_universes in - let inst1, ctx1 = Univ.UContext.dest ctx1 in - let inst2, ctx2 = Univ.UContext.dest ctx2 in - if not (Univ.Instance.length inst1 == Univ.Instance.length inst2) then - error IncompatibleInstances - else - let cstrs = Univ.enforce_eq_instances inst1 inst2 cst in - let cstrs = Univ.Constraint.union cstrs ctx2 in - try - (* The environment with the expected universes plus equality - of the body instances with the expected instance *) - let ctxi = Univ.Instance.append inst1 inst2 in - let ctx = Univ.UContext.make (ctxi, cstrs) in - let env = Environ.push_context ctx env in - (* Check that the given definition does not add any constraint over - the expected ones, so that it can be used in place of - the original. *) - if UGraph.check_constraints ctx1 (Environ.universes env) then - cstrs, env, inst2 - else error (IncompatibleConstraints ctx1) - with Univ.UniverseInconsistency incon -> - error (IncompatibleUniverses incon) - else - cst, env, Univ.Instance.empty + let poly, env = + match cb1.const_universes, cb2.const_universes with + | Monomorphic_const _, Monomorphic_const _ -> + false, env + | Polymorphic_const auctx1, Polymorphic_const auctx2 -> + true, check_polymorphic_instance error env auctx1 auctx2 + | Monomorphic_const _, Polymorphic_const _ -> + error (PolymorphicStatusExpected true) + | Polymorphic_const _, Monomorphic_const _ -> + error (PolymorphicStatusExpected false) in (* Now check types *) - let typ1 = Typeops.type_of_constant_type env' cb1.const_type in - let typ2 = Typeops.type_of_constant_type env' cb2.const_type in - let cst = check_type poly u cst env' typ1 typ2 in + let typ1 = cb1.const_type in + let typ2 = cb2.const_type in + let cst = check_type poly cst env typ1 typ2 in (* Now we check the bodies: - A transparent constant can only be implemented by a compatible transparent constant. @@ -345,40 +267,19 @@ let check_constant cst env mp1 l info1 cb2 spec2 subst1 subst2 = Anyway [check_conv] will handle that afterwards. *) let c1 = Mod_subst.force_constr lc1 in let c2 = Mod_subst.force_constr lc2 in - check_conv NotConvertibleBodyField cst poly u infer_conv env' c1 c2)) + check_conv NotConvertibleBodyField cst poly infer_conv env c1 c2)) | IndType ((kn,i),mind1) -> - ignore (CErrors.error ( + CErrors.user_err Pp.(str @@ "The kernel does not recognize yet that a parameter can be " ^ "instantiated by an inductive type. Hint: you can rename the " ^ "inductive type and give a definition to map the old name to the new " ^ - "name.")); - let () = assert (List.is_empty mind1.mind_hyps && List.is_empty cb2.const_hyps) in - if Declareops.constant_has_body cb2 then error DefinitionFieldExpected; - let u1 = inductive_instance mind1 in - let arity1,cst1 = constrained_type_of_inductive env - ((mind1,mind1.mind_packets.(i)),u1) in - let cst2 = - Declareops.constraints_of_constant (Environ.opaque_tables env) cb2 in - let typ2 = Typeops.type_of_constant_type env cb2.const_type in - let cst = Constraint.union cst (Constraint.union cst1 cst2) in - let error = NotConvertibleTypeField (env, arity1, typ2) in - check_conv error cst false Univ.Instance.empty infer_conv_leq env arity1 typ2 - | IndConstr (((kn,i),j) as cstr,mind1) -> - ignore (CErrors.error ( + "name.") + | IndConstr (((kn,i),j),mind1) -> + CErrors.user_err Pp.(str @@ "The kernel does not recognize yet that a parameter can be " ^ "instantiated by a constructor. Hint: you can rename the " ^ "constructor and give a definition to map the old name to the new " ^ - "name.")); - let () = assert (List.is_empty mind1.mind_hyps && List.is_empty cb2.const_hyps) in - if Declareops.constant_has_body cb2 then error DefinitionFieldExpected; - let u1 = inductive_instance mind1 in - let ty1,cst1 = constrained_type_of_constructor (cstr,u1) (mind1,mind1.mind_packets.(i)) in - let cst2 = - Declareops.constraints_of_constant (Environ.opaque_tables env) cb2 in - let ty2 = Typeops.type_of_constant_type env cb2.const_type in - let cst = Constraint.union cst (Constraint.union cst1 cst2) in - let error = NotConvertibleTypeField (env, ty1, ty2) in - check_conv error cst false Univ.Instance.empty infer_conv env ty1 ty2 + "name.") let rec check_modules cst env msb1 msb2 subst1 subst2 = let mty1 = module_type_of_module msb1 in @@ -450,7 +351,7 @@ and check_modtypes cst env mtb1 mtb2 subst1 subst2 equiv = mod_type = subst_signature subst1 body_t1; mod_type_alg = None; mod_constraints = mtb1.mod_constraints; - mod_retroknowledge = []; + mod_retroknowledge = ModBodyRK []; mod_delta = mtb1.mod_delta} env in check_structure cst env body_t1 body_t2 equiv subst1 subst2 |