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|
(***********************************************************************)
(* *)
(* Objective Caml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* Automatique. Distributed only by permission. *)
(* *)
(***********************************************************************)
(* $Id$ *)
(* Substitutions *)
open Misc
open Path
open Typedtree
type t =
{ types: Path.t Ident.tbl;
modules: Path.t Ident.tbl;
modtypes: module_type Ident.tbl }
let identity =
{ types = Ident.empty; modules = Ident.empty; modtypes = Ident.empty }
let add_type id p s =
{ types = Ident.add id p s.types;
modules = s.modules;
modtypes = s.modtypes }
let add_module id p s =
{ types = s.types;
modules = Ident.add id p s.modules;
modtypes = s.modtypes }
let add_modtype id ty s =
{ types = s.types;
modules = s.modules;
modtypes = Ident.add id ty s.modtypes }
let rec module_path s = function
Pident id as p ->
begin try Ident.find_same id s.modules with Not_found -> p end
| Pdot(p, n, pos) ->
Pdot(module_path s p, n, pos)
| Papply(p1, p2) ->
Papply(module_path s p1, module_path s p2)
let type_path s = function
Pident id as p ->
begin try Ident.find_same id s.types with Not_found -> p end
| Pdot(p, n, pos) ->
Pdot(module_path s p, n, pos)
| Papply(p1, p2) ->
fatal_error "Subst.type_path"
(* From Ctype *)
let rec repr = function
{desc = Tlink ty} as t ->
let r = repr ty in
if r != ty then t.desc <- Tlink r;
r
| t -> t
(* From Ctype *)
let rec opened ty =
match (repr ty).desc with
Tfield(_, _, t) -> opened t
| Tvar -> true
| Tnil -> false
| _ -> fatal_error "Subst.opened"
let generic_level = -1
let newgenty desc =
{desc = desc; level = generic_level}
let new_val = ref []
type 'a visited = Zero | One | Many of 'a
let rec typexp visited s ty =
let ty = repr ty in
if ty.desc = Tvar then ty else
try
match List.assq ty visited with
{contents = Zero} as v ->
let t = newgenty Tvar in
v := Many t;
let ty' = typexp_2 visited s ty v in
t.desc <- ty'.desc;
t
| {contents = One} as v ->
let t = newgenty Tvar in
v := Many t;
t
| {contents = Many t} ->
t
with Not_found ->
let v = ref One in
let ty' = typexp_2 ((ty, v)::visited) s ty v in
match v with
{contents = Many t} ->
t.desc <- ty'.desc;
t
| _ ->
ty'
and typexp_2 visited s ty v =
match ty.desc with
Tvar ->
ty
| Tarrow(t1, t2) ->
newgenty(Tarrow(typexp visited s t1, typexp visited s t2))
| Ttuple tl ->
newgenty(Ttuple(List.map (typexp visited s) tl))
| Tconstr(p, [], _) ->
newgenty(Tconstr(type_path s p, [], ref []))
| Tconstr(p, tl, _) ->
newgenty(Tconstr(type_path s p, List.map (typexp visited s) tl, ref []))
| Tobject (t1, name) ->
let ty' () =
let name' =
match !name with
None -> None
| Some (p, tl) ->
Some (type_path s p, List.map (typexp visited s) tl)
in
newgenty(Tobject (typexp visited s t1, ref name'))
in
if opened t1 then
try
List.assq ty !new_val
with Not_found ->
if v = ref One then begin
let t = newgenty Tvar in
v := Many t;
new_val := (ty, t):: !new_val
end;
ty' ()
else
ty' ()
| Tfield(n, t1, t2) ->
newgenty(Tfield(n, typexp visited s t1, typexp visited s t2))
| Tnil ->
newgenty Tnil
| Tlink _ ->
fatal_error "Subst.typexp"
let type_expr s ty =
new_val := [];
let ty = typexp [] s ty in
new_val := [];
ty
let value_description s descr =
{ val_type = type_expr s descr.val_type;
val_kind = descr.val_kind }
let type_declaration s decl =
{ type_params = decl.type_params;
type_arity = decl.type_arity;
type_kind =
begin match decl.type_kind with
Type_abstract -> Type_abstract
| Type_variant cstrs ->
Type_variant(List.map (fun (n, args) -> (n, List.map (type_expr s) args))
cstrs)
| Type_record lbls ->
Type_record(List.map (fun (n, mut, arg) -> (n, mut, type_expr s arg))
lbls)
end;
type_manifest =
begin match decl.type_manifest with
None -> None
| Some ty -> Some(type_expr s ty)
end
}
let exception_declaration s tyl =
List.map (type_expr s) tyl
let class_type s decl =
new_val := [];
let params = List.map (function p -> (repr p, ref Zero)) decl.cty_params in
let decl =
{ cty_params = List.map (typexp params s) decl.cty_params;
cty_args = List.map (typexp params s) decl.cty_args;
cty_vars =
Vars.fold (fun l (m, t) -> Vars.add l (m, typexp params s t))
decl.cty_vars Vars.empty;
cty_self = typexp params s decl.cty_self;
cty_concr = decl.cty_concr;
cty_new =
begin match decl.cty_new with
None -> None
| Some ty -> Some (typexp params s ty)
end }
in
new_val := [];
decl
let rec modtype s = function
Tmty_ident p as mty ->
begin match p with
Pident id ->
begin try Ident.find_same id s.modtypes with Not_found -> mty end
| Pdot(p, n, pos) ->
Tmty_ident(Pdot(module_path s p, n, pos))
| Papply(p1, p2) ->
fatal_error "Subst.modtype"
end
| Tmty_signature sg ->
Tmty_signature(signature s sg)
| Tmty_functor(id, arg, res) ->
Tmty_functor(id, modtype s arg, modtype s res)
and signature s sg = List.map (signature_item s) sg
and signature_item s = function
Tsig_value(id, d) -> Tsig_value(id, value_description s d)
| Tsig_type(id, d) -> Tsig_type(id, type_declaration s d)
| Tsig_exception(id, d) -> Tsig_exception(id, exception_declaration s d)
| Tsig_module(id, mty) -> Tsig_module(id, modtype s mty)
| Tsig_modtype(id, d) -> Tsig_modtype(id, modtype_declaration s d)
| Tsig_class(id, d) -> Tsig_class(id, class_type s d)
and modtype_declaration s = function
Tmodtype_abstract -> Tmodtype_abstract
| Tmodtype_manifest mty -> Tmodtype_manifest(modtype s mty)
|
