(**************************************************************************)
(*                                                                        *)
(*                                 OCaml                                  *)
(*                                                                        *)
(*                       Pierre Chambart, OCamlPro                        *)
(*           Mark Shinwell and Leo White, Jane Street Europe              *)
(*                                                                        *)
(*   Copyright 2013--2016 OCamlPro SAS                                    *)
(*   Copyright 2014--2016 Jane Street Group LLC                           *)
(*                                                                        *)
(*   All rights reserved.  This file is distributed under the terms of    *)
(*   the GNU Lesser General Public License version 2.1, with the          *)
(*   special exception on linking described in the file LICENSE.          *)
(*                                                                        *)
(**************************************************************************)

[@@@ocaml.warning "+a-4-9-30-40-41-42"]

(** Generation of [Flambda] intermediate language code from [Lambda] code
  by performing a form of closure conversion.

  Function declarations (which may bind one or more variables identifying
  functions, possibly with mutual recursion) are transformed to
  [Set_of_closures] expressions.  [Project_closure] expressions are then
  used to select a closure for a particular function from a [Set_of_closures]
  expression.  The [Set_of_closures] expressions say nothing about the
  actual runtime layout of the closures; this is handled when [Flambda] code
  is translated to [Clambda] code.

  The following transformations are also performed during closure
  conversion:
  - Constant blocks (by which is meant things wrapped in [Lambda.Const_block])
    are converted to applications of the [Pmakeblock] primitive.
  - [Levent] debugging event nodes are removed and the information within
    them attached to function, method and [raise] calls.
  - Tuplified functions are converted to curried functions and a stub
    function emitted to call the curried version.  For example:
      let rec f (x, y) = f (x + 1, y + 1)
    is transformed to:
      let rec internal_f x y = f (x + 1,y + 1)
      and f (x, y) = internal_f x y  (* [f] is marked as a stub function *)
  - The [Pdirapply] and [Prevapply] application primitives are removed and
    converted to normal [Flambda] application nodes.

  The [lambda_to_flambda] function is not re-entrant.
*)
val lambda_to_flambda
   : backend:(module Backend_intf.S)
  -> module_ident:Ident.t
  -> size:int
  -> filename:string
  -> Lambda.lambda
  -> Flambda.program