129 lines
4.4 KiB
OCaml
129 lines
4.4 KiB
OCaml
open Signature
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open Modules
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open Names
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open Static
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open Mls_mapfold
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open Minils
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(* Iterator fusion *)
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(* Functions to temporarily store anonymous nodes*)
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let mk_fresh_node_name () =
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current_qual (Idents.name (Idents.fresh "_n_"))
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let anon_nodes = ref QualEnv.empty
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let add_anon_node inputs outputs locals eqs =
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let n = mk_fresh_node_name () in
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let nd = mk_node ~input:inputs ~output:outputs ~local:locals
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~eq:eqs n in
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anon_nodes := QualEnv.add n nd !anon_nodes;
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n
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let replace_anon_node n nd =
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anon_nodes := QualEnv.add n nd !anon_nodes
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let find_anon_node n =
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QualEnv.find n !anon_nodes
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let is_anon_node n =
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QualEnv.mem n !anon_nodes
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let are_equal n m =
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let n = simplify QualEnv.empty n in
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let m = simplify QualEnv.empty m in
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n = m
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let pat_of_vd_list l =
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match l with
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| [vd] -> Evarpat (vd.v_ident)
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| _ -> Etuplepat (List.map (fun vd -> Evarpat vd.v_ident) l)
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let tuple_of_vd_list l =
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let el = List.map (fun vd -> mk_exp ~exp_ty:vd.v_type (Evar vd.v_ident)) l in
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let ty = Types.prod (List.map (fun vd -> vd.v_type) l) in
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mk_exp ~exp_ty:ty (Eapp (mk_app Etuple, el, None))
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let vd_of_arg ad =
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let n = match ad.a_name with None -> "_v" | Some n -> n in
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mk_var_dec (Idents.fresh n) ad.a_type
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(** @return the lists of inputs and outputs (as var_dec) of
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an app object. *)
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let get_node_inp_outp app = match app.a_op with
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| (Enode f | Efun f) when is_anon_node f ->
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(* first check if it is an anonymous node *)
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let nd = find_anon_node f in
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nd.n_input, nd.n_output
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| Enode f | Efun f ->
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(* it is a regular node*)
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let ty_desc = find_value f in
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let new_inp = List.map vd_of_arg ty_desc.node_outputs in
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let new_outp = List.map vd_of_arg ty_desc.node_outputs in
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new_inp, new_outp
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| _ -> assert false
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(** Creates the equation to call the node [app].
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@return the list of new inputs required by the call, the expression
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used to retrieve the resul of the call and [acc_eq_list] with the
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added equations. *)
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let mk_call app acc_eq_list =
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let new_inp, new_outp = get_node_inp_outp app in
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let args = List.map (fun vd -> mk_exp ~exp_ty:vd.v_type
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(Evar vd.v_ident)) new_inp in
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let out_ty = Types.prod (List.map (fun vd -> vd.v_type) new_outp) in
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let e = mk_exp ~exp_ty:out_ty (Eapp (app, args, None)) in
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match List.length new_outp with
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| 1 -> new_inp, e, acc_eq_list
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| _ ->
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(*more than one output, we need to create a new equation *)
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let eq = mk_equation (pat_of_vd_list new_outp) e in
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let e = tuple_of_vd_list new_outp in
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new_inp, e, eq::acc_eq_list
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let edesc funs acc ed =
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let ed, acc = Mls_mapfold.edesc funs acc ed in
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match ed with
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| Eiterator(Imap, f, n, e_list, r) ->
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(** @return the list of inputs of the anonymous function,
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a list of created equations (the body of the function),
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the args for the call of f in the lambda,
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the args for the iterator (ie the arrays).
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[b] is used to know whether some fusion can be done.
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map f (map g (x, y), z) --->
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fun x', y', z' -> o1, o2 with
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_v1, _v2 = g(x',y')
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o1, o2 = f (_v1, _v2, z')
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*)
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let mk_arg e (inp, acc_eq_list, largs, args, b) = match e.e_desc with
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| Eiterator(Imap, g, m, local_args, _) when are_equal n m ->
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let new_inp, e, acc_eq_list = mk_call g acc_eq_list in
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new_inp @ inp, acc_eq_list, e::largs, local_args @ args, true
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| _ ->
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let vd = mk_var_dec (Idents.fresh "_x") e.e_ty in
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let x = mk_exp (Evar vd.v_ident) in
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vd::inp, acc_eq_list, x::largs, e::args, b
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in
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let inp, acc_eq_list, largs, args, can_be_fused =
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List.fold_right mk_arg e_list ([], [], [], [], false) in
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if can_be_fused then (
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(* create the call to f in the lambda fun *)
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let call = mk_exp (Eapp(f, largs, None)) in
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let _, outp = get_node_inp_outp f in
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let eq = mk_equation (pat_of_vd_list outp) call in
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(* create the lambda *)
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let anon = mk_app (Enode (add_anon_node inp outp [] (eq::acc_eq_list))) in
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Eiterator(Imap, anon, n, args, r), acc
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) else
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ed, acc
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| _ -> raise Misc.Fallback
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let program p =
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let funs = { Mls_mapfold.defaults with edesc = edesc } in
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let p, _ = Mls_mapfold.program_it funs false p in
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p
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