(***********************************************************************) (* *) (* 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. *) (* *) (***********************************************************************) (* $Id$ *) (* Representation of types and declarations *) open Misc 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 | 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 | Tpoly of type_expr * type_expr list | Tpackage of Path.t * string list * type_expr list and row_desc = { row_fields: (label * row_field) list; row_more: type_expr; row_bound: unit; 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 = struct type t = type_expr let compare t1 t2 = t1.id - t2.id let hash t = t.id let equal t1 t2 = t1 == t2 end (* Maps of methods and instance variables *) module OrderedString = struct type t = string let compare = compare end module Meths = Map.Make(OrderedString) module Vars = Meths (* Value descriptions *) type value_description = { val_type: type_expr; (* Type of the value *) val_kind: value_kind } 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 * Asttypes.mutable_flag * Asttypes.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_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_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 (* 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 *) and type_kind = Type_abstract | Type_variant of (string * type_expr list) list | Type_record of (string * mutable_flag * type_expr) list * record_representation type exception_declaration = type_expr list (* Type expressions for the class language *) module Concr = Set.Make(OrderedString) type class_type = Tcty_constr of Path.t * type_expr list * class_type | Tcty_signature of class_signature | Tcty_fun of label * type_expr * class_type and class_signature = { cty_self: type_expr; cty_vars: (Asttypes.mutable_flag * Asttypes.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 cltype_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 = Tmty_ident of Path.t | Tmty_signature of signature | Tmty_functor of Ident.t * module_type * module_type and signature = signature_item list and signature_item = Tsig_value of Ident.t * value_description | Tsig_type of Ident.t * type_declaration * rec_status | Tsig_exception of Ident.t * exception_declaration | Tsig_module of Ident.t * module_type * rec_status | Tsig_modtype of Ident.t * modtype_declaration | Tsig_class of Ident.t * class_declaration * rec_status | Tsig_cltype of Ident.t * cltype_declaration * rec_status and modtype_declaration = Tmodtype_abstract | Tmodtype_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 *)