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|
(***********************************************************************)
(* *)
(* OCaml *)
(* *)
(* 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. *)
(* *)
(***********************************************************************)
(* $Id$ *)
(* Representation of types and declarations *)
open Asttypes
(* Type expressions for the core language *)
type type_expr =
{ mutable desc: type_desc;
mutable level: int;
mutable id: int }
and type_desc =
Tvar of string option
| Tarrow of label * type_expr * type_expr * commutable
| Ttuple of type_expr list
| Tconstr of Path.t * type_expr list * abbrev_memo ref
| Tobject of type_expr * (Path.t * type_expr list) option ref
| Tfield of string * field_kind * type_expr * type_expr
| Tnil
| Tlink of type_expr
| Tsubst of type_expr (* for copying *)
| Tvariant of row_desc
| Tunivar of string option
| Tpoly of type_expr * type_expr list
| Tpackage of Path.t * Longident.t list * type_expr list
and row_desc =
{ row_fields: (label * row_field) list;
row_more: type_expr;
row_bound: unit; (* kept for compatibility *)
row_closed: bool;
row_fixed: bool;
row_name: (Path.t * type_expr list) option }
and row_field =
Rpresent of type_expr option
| Reither of bool * type_expr list * bool * row_field option ref
(* 1st true denotes a constant constructor *)
(* 2nd true denotes a tag in a pattern matching, and
is erased later *)
| Rabsent
and abbrev_memo =
Mnil
| Mcons of private_flag * Path.t * type_expr * type_expr * abbrev_memo
| Mlink of abbrev_memo ref
and field_kind =
Fvar of field_kind option ref
| Fpresent
| Fabsent
and commutable =
Cok
| Cunknown
| Clink of commutable ref
module TypeOps : sig
type t = type_expr
val compare : t -> t -> int
val equal : t -> t -> bool
val hash : t -> int
end
(* Maps of methods and instance variables *)
module Meths : Map.S with type key = string
module Vars : Map.S with type key = string
(* Value descriptions *)
type value_description =
{ val_type: type_expr; (* Type of the value *)
val_kind: value_kind;
val_loc: Location.t;
}
and value_kind =
Val_reg (* Regular value *)
| Val_prim of Primitive.description (* Primitive *)
| Val_ivar of mutable_flag * string (* Instance variable (mutable ?) *)
| Val_self of (Ident.t * type_expr) Meths.t ref *
(Ident.t * mutable_flag * virtual_flag * type_expr) Vars.t ref *
string * type_expr
(* Self *)
| Val_anc of (string * Ident.t) list * string
(* Ancestor *)
| Val_unbound (* Unbound variable *)
(* Constructor descriptions *)
type constructor_description =
{ cstr_res: type_expr; (* Type of the result *)
cstr_existentials: type_expr list; (* list of existentials *)
cstr_args: type_expr list; (* Type of the arguments *)
cstr_arity: int; (* Number of arguments *)
cstr_tag: constructor_tag; (* Tag for heap blocks *)
cstr_consts: int; (* Number of constant constructors *)
cstr_nonconsts: int; (* Number of non-const constructors *)
cstr_normal: int; (* Number of non generalized constrs *)
cstr_generalized: bool; (* Constrained return type? *)
cstr_private: private_flag } (* Read-only constructor? *)
and constructor_tag =
Cstr_constant of int (* Constant constructor (an int) *)
| Cstr_block of int (* Regular constructor (a block) *)
| Cstr_exception of Path.t * Location.t (* Exception constructor *)
(* Record label descriptions *)
type label_description =
{ lbl_name: string; (* Short name *)
lbl_res: type_expr; (* Type of the result *)
lbl_arg: type_expr; (* Type of the argument *)
lbl_mut: mutable_flag; (* Is this a mutable field? *)
lbl_pos: int; (* Position in block *)
lbl_all: label_description array; (* All the labels in this type *)
lbl_repres: record_representation; (* Representation for this record *)
lbl_private: private_flag } (* Read-only field? *)
and record_representation =
Record_regular (* All fields are boxed / tagged *)
| Record_float (* All fields are floats *)
(* Type definitions *)
type type_declaration =
{ type_params: type_expr list;
type_arity: int;
type_kind: type_kind;
type_private: private_flag;
type_manifest: type_expr option;
type_variance: (bool * bool * bool) list;
(* covariant, contravariant, weakly contravariant *)
type_newtype_level: (int * int) option;
(* definition level * expansion level *)
type_loc: Location.t }
and type_kind =
Type_abstract
| Type_record of
(Ident.t * mutable_flag * type_expr) list * record_representation
| Type_variant of (Ident.t * type_expr list * type_expr option) list
type exception_declaration =
{ exn_args: type_expr list;
exn_loc: Location.t }
(* Type expressions for the class language *)
module Concr : Set.S with type elt = string
type class_type =
Cty_constr of Path.t * type_expr list * class_type
| Cty_signature of class_signature
| Cty_fun of label * type_expr * class_type
and class_signature =
{ cty_self: type_expr;
cty_vars: (mutable_flag * virtual_flag * type_expr) Vars.t;
cty_concr: Concr.t;
cty_inher: (Path.t * type_expr list) list }
type class_declaration =
{ cty_params: type_expr list;
mutable cty_type: class_type;
cty_path: Path.t;
cty_new: type_expr option;
cty_variance: (bool * bool) list }
type class_type_declaration =
{ clty_params: type_expr list;
clty_type: class_type;
clty_path: Path.t;
clty_variance: (bool * bool) list }
(* Type expressions for the module language *)
type module_type =
Mty_ident of Path.t
| Mty_signature of signature
| Mty_functor of Ident.t * module_type * module_type
and signature = signature_item list
and signature_item =
Sig_value of Ident.t * value_description
| Sig_type of Ident.t * type_declaration * rec_status
| Sig_exception of Ident.t * exception_declaration
| Sig_module of Ident.t * module_type * rec_status
| Sig_modtype of Ident.t * modtype_declaration
| Sig_class of Ident.t * class_declaration * rec_status
| Sig_class_type of Ident.t * class_type_declaration * rec_status
and modtype_declaration =
Modtype_abstract
| Modtype_manifest of module_type
and rec_status =
Trec_not (* not recursive *)
| Trec_first (* first in a recursive group *)
| Trec_next (* not first in a recursive group *)
|
