viewcvs.cgi/typing/typed.ml

(* Typed abstract syntax *) 

(*  Some sub-expression may have to be type-checked several times.
    We first build the ``skeleton'' of the typed ast
    (basically the parsed ast with types and patterns replaced with there
    internal representation), then type check it.

    The exp_typ and br_typ fields are updated to capture all the possible
    values than can result from the expression or flow to the branch
*)

open Location

type tpat = Patterns.node
type ttyp = Types.node

type texpr  = { exp_loc : loc; 
                mutable exp_typ : Types.descr; 
                exp_descr : texpr';
              }
and  texpr' = 
  (* CDuce is a Lambda-calculus ... *)
  | Var of string
  | Apply of texpr * texpr
  | Abstraction of abstr
      
  (* Data constructors *)
  | Cst of Types.const
  | Pair of texpr * texpr
  | RecordLitt of (Types.label * texpr) list
      
  (* Data destructors *)
  | Op of op * texpr
  | Match of texpr * branches
  | Map of texpr * branches

and abstr = { 
  fun_name : string option; 
  fun_iface : (Types.descr * Types.descr) list;
  fun_body : branches;
  fun_typ  : Types.descr;
  fun_fv   : string list;
}

and branches = { 
  mutable br_typ : Types.descr;
  br_branches: branch list
}
and branch = { 
  mutable br_used : bool; 
  br_pat : tpat; 
  br_body :  texpr 
}
    
and op = string

1	abate	4	(* Typed abstract syntax *)
2
3	abate	5	(* Some sub-expression may have to be type-checked several times.
4			We first build the ``skeleton'' of the typed ast
5			(basically the parsed ast with types and patterns replaced with there
6			internal representation), then type check it.
7
8			The exp_typ and br_typ fields are updated to capture all the possible
9			values than can result from the expression or flow to the branch
10			*)
11
12	abate	4	open Location
13
14			type tpat = Patterns.node
15			type ttyp = Types.node
16
17	abate	9	type texpr = { exp_loc : loc;
18	abate	5	mutable exp_typ : Types.descr;
19			exp_descr : texpr';
20			}
21	abate	4	and texpr' =
22			(* CDuce is a Lambda-calculus ... *)
23			\| Var of string
24			\| Apply of texpr * texpr
25			\| Abstraction of abstr
26
27			(* Data constructors *)
28			\| Cst of Types.const
29			\| Pair of texpr * texpr
30			\| RecordLitt of (Types.label * texpr) list
31
32			(* Data destructors *)
33			\| Op of op * texpr
34			\| Match of texpr * branches
35			\| Map of texpr * branches
36
37			and abstr = {
38			fun_name : string option;
39	abate	9	fun_iface : (Types.descr * Types.descr) list;
40	abate	6	fun_body : branches;
41			fun_typ : Types.descr;
42			fun_fv : string list;
43	abate	4	}
44
45	abate	9	and branches = {
46			mutable br_typ : Types.descr;
47			br_branches: branch list
48			}
49			and branch = {
50			mutable br_used : bool;
51			br_pat : tpat;
52			br_body : texpr
53			}
54	abate	4
55			and op = string
56