/usr/lib/ocaml/compiler-libs/typing/includecore.ml is in ocaml-compiler-libs 3.12.1-2ubuntu2.
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(* *)
(* Objective Caml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the Q Public License version 1.0. *)
(* *)
(***********************************************************************)
(* $Id: includecore.ml 10458 2010-05-24 06:52:16Z garrigue $ *)
(* Inclusion checks for the core language *)
open Misc
open Asttypes
open Path
open Types
open Typedtree
(* Inclusion between value descriptions *)
exception Dont_match
let value_descriptions env vd1 vd2 =
if Ctype.moregeneral env true vd1.val_type vd2.val_type then begin
match (vd1.val_kind, vd2.val_kind) with
(Val_prim p1, Val_prim p2) ->
if p1 = p2 then Tcoerce_none else raise Dont_match
| (Val_prim p, _) -> Tcoerce_primitive p
| (_, Val_prim p) -> raise Dont_match
| (_, _) -> Tcoerce_none
end else
raise Dont_match
(* Inclusion between "private" annotations *)
let private_flags decl1 decl2 =
match decl1.type_private, decl2.type_private with
| Private, Public ->
decl2.type_kind = Type_abstract &&
(decl2.type_manifest = None || decl1.type_kind <> Type_abstract)
| _, _ -> true
(* Inclusion between manifest types (particularly for private row types) *)
let is_absrow env ty =
match ty.desc with
Tconstr(Pident id, _, _) ->
begin match Ctype.expand_head env ty with
{desc=Tobject _|Tvariant _} -> true
| _ -> false
end
| _ -> false
let type_manifest env ty1 params1 ty2 params2 priv2 =
let ty1' = Ctype.expand_head env ty1 and ty2' = Ctype.expand_head env ty2 in
match ty1'.desc, ty2'.desc with
Tvariant row1, Tvariant row2 when is_absrow env (Btype.row_more row2) ->
let row1 = Btype.row_repr row1 and row2 = Btype.row_repr row2 in
Ctype.equal env true (ty1::params1) (row2.row_more::params2) &&
(match row1.row_more with {desc=Tvar|Tconstr _} -> true | _ -> false) &&
let r1, r2, pairs =
Ctype.merge_row_fields row1.row_fields row2.row_fields in
(not row2.row_closed ||
row1.row_closed && Ctype.filter_row_fields false r1 = []) &&
List.for_all
(fun (_,f) -> match Btype.row_field_repr f with
Rabsent | Reither _ -> true | Rpresent _ -> false)
r2 &&
let to_equal = ref (List.combine params1 params2) in
List.for_all
(fun (_, f1, f2) ->
match Btype.row_field_repr f1, Btype.row_field_repr f2 with
Rpresent(Some t1),
(Rpresent(Some t2) | Reither(false, [t2], _, _)) ->
to_equal := (t1,t2) :: !to_equal; true
| Rpresent None, (Rpresent None | Reither(true, [], _, _)) -> true
| Reither(c1,tl1,_,_), Reither(c2,tl2,_,_)
when List.length tl1 = List.length tl2 && c1 = c2 ->
to_equal := List.combine tl1 tl2 @ !to_equal; true
| Rabsent, (Reither _ | Rabsent) -> true
| _ -> false)
pairs &&
let tl1, tl2 = List.split !to_equal in
Ctype.equal env true tl1 tl2
| Tobject (fi1, _), Tobject (fi2, _)
when is_absrow env (snd(Ctype.flatten_fields fi2)) ->
let (fields2,rest2) = Ctype.flatten_fields fi2 in
Ctype.equal env true (ty1::params1) (rest2::params2) &&
let (fields1,rest1) = Ctype.flatten_fields fi1 in
(match rest1 with {desc=Tnil|Tvar|Tconstr _} -> true | _ -> false) &&
let pairs, miss1, miss2 = Ctype.associate_fields fields1 fields2 in
miss2 = [] &&
let tl1, tl2 =
List.split (List.map (fun (_,_,t1,_,t2) -> t1, t2) pairs) in
Ctype.equal env true (params1 @ tl1) (params2 @ tl2)
| _ ->
let rec check_super ty1 =
Ctype.equal env true (ty1 :: params1) (ty2 :: params2) ||
priv2 = Private &&
try check_super
(Ctype.try_expand_once_opt env (Ctype.expand_head env ty1))
with Ctype.Cannot_expand -> false
in check_super ty1
(* Inclusion between type declarations *)
type type_mismatch =
Arity
| Privacy
| Kind
| Constraint
| Manifest
| Variance
| Field_type of string
| Field_mutable of string
| Field_arity of string
| Field_names of int * string * string
| Field_missing of bool * string
| Record_representation of bool
let nth n =
if n = 1 then "first" else
if n = 2 then "2nd" else
if n = 3 then "3rd" else
string_of_int n ^ "th"
let report_type_mismatch0 first second decl ppf err =
let pr fmt = Format.fprintf ppf fmt in
match err with
Arity -> pr "They have different arities"
| Privacy -> pr "A private type would be revealed"
| Kind -> pr "Their kinds differ"
| Constraint -> pr "Their constraints differ"
| Manifest -> ()
| Variance -> pr "Their variances do not agree"
| Field_type s ->
pr "The types for field %s are not equal" s
| Field_mutable s ->
pr "The mutability of field %s is different" s
| Field_arity s ->
pr "The arities for field %s differ" s
| Field_names (n, name1, name2) ->
pr "Their %s fields have different names, %s and %s"
(nth n) name1 name2
| Field_missing (b, s) ->
pr "The field %s is only present in %s %s"
s (if b then second else first) decl
| Record_representation b ->
pr "Their internal representations differ:@ %s %s %s"
(if b then second else first) decl
"uses unboxed float representation"
let report_type_mismatch first second decl ppf =
List.iter
(fun err ->
if err = Manifest then () else
Format.fprintf ppf "@ %a." (report_type_mismatch0 first second decl) err)
let rec compare_variants env decl1 decl2 n cstrs1 cstrs2 =
match cstrs1, cstrs2 with
[], [] -> []
| [], (cstr2,_)::_ -> [Field_missing (true, cstr2)]
| (cstr1,_)::_, [] -> [Field_missing (false, cstr1)]
| (cstr1, arg1)::rem1, (cstr2, arg2)::rem2 ->
if cstr1 <> cstr2 then [Field_names (n, cstr1, cstr2)] else
if List.length arg1 <> List.length arg2 then [Field_arity cstr1] else
if Misc.for_all2
(fun ty1 ty2 ->
Ctype.equal env true (ty1::decl1.type_params)
(ty2::decl2.type_params))
arg1 arg2
then compare_variants env decl1 decl2 (n+1) rem1 rem2
else [Field_type cstr1]
let rec compare_records env decl1 decl2 n labels1 labels2 =
match labels1, labels2 with
[], [] -> []
| [], (lab2,_,_)::_ -> [Field_missing (true, lab2)]
| (lab1,_,_)::_, [] -> [Field_missing (false, lab1)]
| (lab1, mut1, arg1)::rem1, (lab2, mut2, arg2)::rem2 ->
if lab1 <> lab2 then [Field_names (n, lab1, lab2)] else
if mut1 <> mut2 then [Field_mutable lab1] else
if Ctype.equal env true (arg1::decl1.type_params)
(arg2::decl2.type_params)
then compare_records env decl1 decl2 (n+1) rem1 rem2
else [Field_type lab1]
let type_declarations env id decl1 decl2 =
if decl1.type_arity <> decl2.type_arity then [Arity] else
if not (private_flags decl1 decl2) then [Privacy] else
let err = match (decl1.type_kind, decl2.type_kind) with
(_, Type_abstract) -> []
| (Type_variant cstrs1, Type_variant cstrs2) ->
compare_variants env decl1 decl2 1 cstrs1 cstrs2
| (Type_record(labels1,rep1), Type_record(labels2,rep2)) ->
let err = compare_records env decl1 decl2 1 labels1 labels2 in
if err <> [] || rep1 = rep2 then err else
[Record_representation (rep2 = Record_float)]
| (_, _) -> [Kind]
in
if err <> [] then err else
let err = match (decl1.type_manifest, decl2.type_manifest) with
(_, None) ->
if Ctype.equal env true decl1.type_params decl2.type_params
then [] else [Constraint]
| (Some ty1, Some ty2) ->
if type_manifest env ty1 decl1.type_params ty2 decl2.type_params
decl2.type_private
then [] else [Manifest]
| (None, Some ty2) ->
let ty1 =
Btype.newgenty (Tconstr(Pident id, decl2.type_params, ref Mnil))
in
if Ctype.equal env true decl1.type_params decl2.type_params then
if Ctype.equal env false [ty1] [ty2] then []
else [Manifest]
else [Constraint]
in
if err <> [] then err else
if match decl2.type_kind with
| Type_record (_,_) | Type_variant _ -> decl2.type_private = Private
| Type_abstract ->
match decl2.type_manifest with
| None -> true
| Some ty -> Btype.has_constr_row (Ctype.expand_head env ty)
then
if List.for_all2
(fun (co1,cn1,ct1) (co2,cn2,ct2) -> (not co1 || co2)&&(not cn1 || cn2))
decl1.type_variance decl2.type_variance
then [] else [Variance]
else []
(* Inclusion between exception declarations *)
let exception_declarations env ed1 ed2 =
Misc.for_all2 (fun ty1 ty2 -> Ctype.equal env false [ty1] [ty2]) ed1 ed2
(* Inclusion between class types *)
let encode_val (mut, ty) rem =
begin match mut with
Asttypes.Mutable -> Predef.type_unit
| Asttypes.Immutable -> Btype.newgenty Tvar
end
::ty::rem
let meths meths1 meths2 =
Meths.fold
(fun nam t2 (ml1, ml2) ->
(begin try
Meths.find nam meths1 :: ml1
with Not_found ->
ml1
end,
t2 :: ml2))
meths2 ([], [])
let vars vars1 vars2 =
Vars.fold
(fun lab v2 (vl1, vl2) ->
(begin try
encode_val (Vars.find lab vars1) vl1
with Not_found ->
vl1
end,
encode_val v2 vl2))
vars2 ([], [])
|