(***********************************************************************)
(*                                                                     *)
(*                           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.               *)
(*                                                                     *)
(***********************************************************************)

(* $Id$ *)

(* Compilation environments for compilation units *)

open Clambda

(* Each .o file has a matching .cmx file that provides the following infos
   on the compilation unit:
     - list of other units imported, with CRCs of their .cmx files
     - approximation of the structure implemented
       (includes descriptions of known functions: arity and direct entry
        points)
     - list of currying functions and application functions needed
   The .cmx file contains these infos (as an externed record) plus a CRC
   of these infos *)

type unit_infos =
  { mutable ui_name: string;                    (* Name of unit implemented *)
    mutable ui_imports_cmi: (string * Digest.t) list; (* Interfaces imported *)
    mutable ui_imports_cmx: (string * Digest.t) list; (* Infos imported *)
    mutable ui_approx: value_approximation;     (* Approx of the structure *)
    mutable ui_curry_fun: int list;             (* Currying functions needed *)
    mutable ui_apply_fun: int list;             (* Apply functions needed *)
    mutable ui_force_link: bool }               (* Always linked *)

(* Each .a library has a matching .cmxa file that provides the following
   infos on the library: *)

type library_infos =
  { lib_units: (unit_infos * Digest.t) list;  (* List of unit infos w/ CRCs *)
    lib_ccobjs: string list;            (* C object files needed *)
    lib_ccopts: string list }           (* Extra opts to C compiler *)

val reset: string -> unit
        (* Reset the environment and record the name of the unit being
           compiled (arg). *)

val current_unit_name: unit -> string
        (* Return the name of the unit being compiled *)

val global_approx: Ident.t -> Clambda.value_approximation
        (* Return the approximation for the given global identifier *)
val set_global_approx: Clambda.value_approximation -> unit
        (* Record the approximation of the unit being compiled *)

val need_curry_fun: int -> unit
val need_apply_fun: int -> unit
        (* Record the need of a currying (resp. application) function
           with the given arity *)

val read_unit_info: string -> unit_infos * Digest.t
        (* Read infos and CRC from a [.cmx] file. *)
val save_unit_info: string -> unit
        (* Save the infos for the current unit in the given file *)

val cmx_not_found_crc: Digest.t
        (* Special digest used in the [ui_imports_cmx] list to signal
           that no [.cmx] file was found and used for the imported unit *)

type error =
    Not_a_unit_info of string
  | Corrupted_unit_info of string
  | Illegal_renaming of string * string

exception Error of error

val report_error: Format.formatter -> error -> unit