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(********************************************************************)
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(*                                                                  *)
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(*  The LustreC compiler toolset   /  The LustreC Development Team  *)
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(*  Copyright 2012 -    --   ONERA - CNRS - INPT                    *)
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(*                                                                  *)
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(*  LustreC is free software, distributed WITHOUT ANY WARRANTY      *)
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(*  under the terms of the GNU Lesser General Public License        *)
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(*  version 2.1.                                                    *)
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(*                                                                  *)
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(********************************************************************)
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open LustreSpec
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open Corelang
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open Utils
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(* Local annotations are declared with the following key /inlining/: true *)
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let keyword = ["inlining"]
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let is_inline_expr expr = 
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match expr.expr_annot with
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| Some ann -> 
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  List.exists (fun (key, value) -> key = keyword) ann.annots
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| None -> false
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let check_node_name id = (fun t -> 
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  match t.top_decl_desc with 
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  | Node nd -> nd.node_id = id 
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  | _ -> false) 
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let is_node_var node v =
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 try
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   ignore (Corelang.get_node_var v node); true
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 with Not_found -> false
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let rename_expr rename expr = expr_replace_var rename expr
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let rename_eq rename eq = 
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  { eq with
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    eq_lhs = List.map rename eq.eq_lhs; 
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    eq_rhs = rename_expr rename eq.eq_rhs
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  }
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let rec add_expr_reset_cond cond expr =
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  let aux = add_expr_reset_cond cond in
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  let new_desc = 
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    match expr.expr_desc with
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    | Expr_const _
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    | Expr_ident _ -> expr.expr_desc
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    | Expr_tuple el -> Expr_tuple (List.map aux el)
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    | Expr_ite (c, t, e) -> Expr_ite (aux c, aux t, aux e)
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    | Expr_arrow (e1, e2) -> 
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      (* we replace the expression e1 -> e2 by e1 -> (if cond then e1 else e2) *)
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      let e1 = aux e1 and e2 = aux e2 in
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      (* inlining is performed before typing. we can leave the fields free *)
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      let new_e2 = mkexpr expr.expr_loc (Expr_ite (cond, e1, e2)) in
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      Expr_arrow (e1, new_e2) 
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    | Expr_fby _ -> assert false (* TODO: deal with fby. This hasn't been much handled yet *)
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    | Expr_array el -> Expr_array (List.map aux el)
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    | Expr_access (e, dim) -> Expr_access (aux e, dim)
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    | Expr_power (e, dim) -> Expr_power (aux e, dim)
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    | Expr_pre e -> Expr_pre (aux e)
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    | Expr_when (e, id, l) -> Expr_when (aux e, id, l)
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    | Expr_merge (id, cases) -> Expr_merge (id, List.map (fun (l,e) -> l, aux e) cases)
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    | Expr_appl (id, args, reset_opt) -> 
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      (* we "add" cond to the reset field. *)
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      let new_reset = match reset_opt with
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	  None -> cond
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	| Some cond' -> mkpredef_call cond'.expr_loc "||" [cond; cond']
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      in
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      Expr_appl (id, args, Some new_reset)
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  in
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  { expr with expr_desc = new_desc }
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let add_eq_reset_cond cond eq =
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  { eq with eq_rhs = add_expr_reset_cond cond eq.eq_rhs }
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(*
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let get_static_inputs input_arg_list =
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 List.fold_right (fun (vdecl, arg) res ->
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   if vdecl.var_dec_const
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   then (vdecl.var_id, Corelang.dimension_of_expr arg) :: res
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   else res)
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   input_arg_list []
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let get_carrier_inputs input_arg_list =
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 List.fold_right (fun (vdecl, arg) res ->
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   if Corelang.is_clock_dec_type vdecl.var_dec_type.ty_dec_desc
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   then (vdecl.var_id, ident_of_expr arg) :: res
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   else res)
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   input_arg_list []
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*)
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(* 
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    expr, locals', eqs = inline_call id args' reset locals node nodes
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We select the called node equations and variables.
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   renamed_inputs = args
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   renamed_eqs
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the resulting expression is tuple_of_renamed_outputs
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TODO: convert the specification/annotation/assert and inject them
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*)
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(** [inline_call node loc uid args reset locals caller] returns a tuple (expr,
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    locals, eqs, asserts)    
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*)
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let inline_call node loc uid args reset locals caller =
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  let rename v =
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    if v = tag_true || v = tag_false || not (is_node_var node v) then v else
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      Corelang.mk_new_node_name caller (Format.sprintf "%s_%i_%s" node.node_id uid v)
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  in
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  let eqs' = List.map (rename_eq rename) (get_node_eqs node) in
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  let input_arg_list = List.combine node.node_inputs (Corelang.expr_list_of_expr args) in
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  let static_inputs, dynamic_inputs = List.partition (fun (vdecl, arg) -> vdecl.var_dec_const) input_arg_list in
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  let static_inputs = List.map (fun (vdecl, arg) -> vdecl, Corelang.dimension_of_expr arg) static_inputs in
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  let carrier_inputs, other_inputs = List.partition (fun (vdecl, arg) -> Corelang.is_clock_dec_type vdecl.var_dec_type.ty_dec_desc) dynamic_inputs in
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  let carrier_inputs = List.map (fun (vdecl, arg) -> vdecl, Corelang.ident_of_expr arg) carrier_inputs in
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  let rename_static v =
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    try
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      snd (List.find (fun (vdecl, _) -> v = vdecl.var_id) static_inputs)
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    with Not_found -> Dimension.mkdim_ident loc v in
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  let rename_carrier v =
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    try
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      snd (List.find (fun (vdecl, _) -> v = vdecl.var_id) carrier_inputs)
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    with Not_found -> v in
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  let rename_var v =
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    let vdecl =
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      Corelang.mkvar_decl v.var_loc
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	(rename v.var_id,
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	 { v.var_dec_type  with ty_dec_desc = Corelang.rename_static rename_static v.var_dec_type.ty_dec_desc },
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	 { v.var_dec_clock with ck_dec_desc = Corelang.rename_carrier rename_carrier v.var_dec_clock.ck_dec_desc },
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	 v.var_dec_const,
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	 Utils.option_map (rename_expr rename) v.var_dec_value) in
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    begin
139
      (*
140
	(try
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	Format.eprintf "Inliner.inline_call unify %a %a@." Types.print_ty vdecl.var_type Dimension.pp_dimension (List.assoc v.var_id static_inputs);
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	Typing.unify vdecl.var_type (Type_predef.type_static (List.assoc v.var_id static_inputs) (Types.new_var ()))
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	with Not_found -> ());
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	(try
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	Clock_calculus.unify vdecl.var_clock (Clock_predef.ck_carrier (List.assoc v.var_id carrier_inputs) (Clocks.new_var true))
146
	with Not_found -> ());
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      (*Format.eprintf "Inliner.inline_call res=%a@." Printers.pp_var vdecl;*)
148
      *)
149
      vdecl
150
    end
151
    (*Format.eprintf "Inliner.rename_var %a@." Printers.pp_var v;*)
152
  in
153
  let inputs' = List.map (fun (vdecl, _) -> rename_var vdecl) dynamic_inputs in
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  let outputs' = List.map rename_var node.node_outputs in
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  let locals' =
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      (List.map (fun (vdecl, arg) -> let vdecl' = rename_var vdecl in { vdecl' with var_dec_value = Some (Corelang.expr_of_dimension arg) }) static_inputs)
157
    @ (List.map rename_var node.node_locals) 
158
in
159
  (* checking we are at the appropriate (early) step: node_checks and
160
     node_gencalls should be empty (not yet assigned) *)
161
  assert (node.node_checks = []);
162
  assert (node.node_gencalls = []);
163

    
164
  (* Expressing reset locally in equations *)
165
  let eqs_r' =
166
    match reset with
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      None -> eqs'
168
    | Some cond -> List.map (add_eq_reset_cond cond) eqs'
169
  in
170
  let assign_inputs = mkeq loc (List.map (fun v -> v.var_id) inputs',
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                                expr_of_expr_list args.expr_loc (List.map snd dynamic_inputs)) in
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  let expr = expr_of_expr_list loc (List.map expr_of_vdecl outputs')
173
  in
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  let asserts' = (* We rename variables in assert expressions *)
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    List.map 
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      (fun a -> 
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	{a with assert_expr = 
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	    let expr = a.assert_expr in
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	    rename_expr rename expr
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	})
181
      node.node_asserts 
182
  in
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  let annots' =
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    Plugins.inline_annots rename node.node_annot
185
  in
186
  expr, 
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  inputs'@outputs'@locals'@locals, 
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  assign_inputs::eqs_r',
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  asserts',
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  annots'
191

    
192

    
193

    
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let inline_table = Hashtbl.create 23
195

    
196
(* 
197
   new_expr, new_locals, new_eqs = inline_expr expr locals node nodes
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199
   Each occurence of a node in nodes in the expr should be replaced by fresh
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   variables and the code of called node instance added to new_eqs
201

    
202
*)
203
let rec inline_expr ?(selection_on_annotation=false) expr locals node nodes =
204
  let inline_expr = inline_expr ~selection_on_annotation:selection_on_annotation in
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  let inline_node = inline_node ~selection_on_annotation:selection_on_annotation in
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  let inline_tuple el = 
207
    List.fold_right (fun e (el_tail, locals, eqs, asserts, annots) -> 
208
      let e', locals', eqs', asserts', annots' = inline_expr e locals node nodes in
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      e'::el_tail, locals', eqs'@eqs, asserts@asserts', annots@annots'
210
    ) el ([], locals, [], [], [])
211
  in
212
  let inline_pair e1 e2 = 
213
    let el', l', eqs', asserts', annots' = inline_tuple [e1;e2] in
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    match el' with
215
    | [e1'; e2'] -> e1', e2', l', eqs', asserts', annots'
216
    | _ -> assert false
217
  in
218
  let inline_triple e1 e2 e3 = 
219
    let el', l', eqs', asserts', annots' = inline_tuple [e1;e2;e3] in
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    match el' with
221
    | [e1'; e2'; e3'] -> e1', e2', e3', l', eqs', asserts', annots'
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    | _ -> assert false
223
  in
224
  
225
  match expr.expr_desc with
226
  | Expr_appl (id, args, reset) ->
227
    let args', locals', eqs', asserts', annots' = inline_expr args locals node nodes in 
228
    if List.exists (check_node_name id) nodes && (* the current node call is provided
229
						    as arguments nodes *)
230
      (not selection_on_annotation || is_inline_expr expr) (* and if selection on annotation is activated, 
231
							      it is explicitely inlined here *)
232
    then (
233
      (* Format.eprintf "Inlining call to %s in expression %a@." id Printers.pp_expr expr; *)
234
      (* The node should be inlined *)
235
      (* let _ =     Format.eprintf "Inlining call to %s@." id in *)
236
      let called = try List.find (check_node_name id) nodes 
237
	with Not_found -> (assert false) in
238
      let called = node_of_top called in
239
      let called' = inline_node called nodes in
240
      let expr, locals', eqs'', asserts'', annots'' = 
241
	inline_call called' expr.expr_loc expr.expr_tag args' reset locals' node in
242
      expr, locals', eqs'@eqs'', asserts'@asserts'', annots'@annots''
243
    )
244
    else 
245
      (* let _ =     Format.eprintf "Not inlining call to %s@." id in *)
246
      { expr with expr_desc = Expr_appl(id, args', reset)}, 
247
      locals', 
248
      eqs', 
249
      asserts',
250
      annots'
251

    
252
  (* For other cases, we just keep the structure, but convert sub-expressions *)
253
  | Expr_const _ 
254
  | Expr_ident _ -> expr, locals, [], [], []
255
  | Expr_tuple el -> 
256
    let el', l', eqs', asserts', annots' = inline_tuple el in
257
    { expr with expr_desc = Expr_tuple el' }, l', eqs', asserts', annots'
258
  | Expr_ite (g, t, e) ->
259
    let g', t', e', l', eqs', asserts', annots' = inline_triple g t e in
260
    { expr with expr_desc = Expr_ite (g', t', e') }, l', eqs', asserts', annots'
261
  | Expr_arrow (e1, e2) ->
262
    let e1', e2', l', eqs', asserts', annots' = inline_pair e1 e2 in
263
    { expr with expr_desc = Expr_arrow (e1', e2') } , l', eqs', asserts', annots'
264
  | Expr_fby (e1, e2) ->
265
    let e1', e2', l', eqs', asserts', annots' = inline_pair e1 e2 in
266
    { expr with expr_desc = Expr_fby (e1', e2') }, l', eqs', asserts', annots'
267
  | Expr_array el ->
268
    let el', l', eqs', asserts', annots' = inline_tuple el in
269
    { expr with expr_desc = Expr_array el' }, l', eqs', asserts', annots'
270
  | Expr_access (e, dim) ->
271
    let e', l', eqs', asserts', annots' = inline_expr e locals node nodes in 
272
    { expr with expr_desc = Expr_access (e', dim) }, l', eqs', asserts', annots'
273
  | Expr_power (e, dim) ->
274
    let e', l', eqs', asserts', annots' = inline_expr e locals node nodes in 
275
    { expr with expr_desc = Expr_power (e', dim) }, l', eqs', asserts', annots'
276
  | Expr_pre e ->
277
    let e', l', eqs', asserts', annots' = inline_expr e locals node nodes in 
278
    { expr with expr_desc = Expr_pre e' }, l', eqs', asserts', annots'
279
  | Expr_when (e, id, label) ->
280
    let e', l', eqs', asserts', annots' = inline_expr e locals node nodes in 
281
    { expr with expr_desc = Expr_when (e', id, label) }, l', eqs', asserts', annots'
282
  | Expr_merge (id, branches) ->
283
    let el, l', eqs', asserts', annots' = inline_tuple (List.map snd branches) in
284
    let branches' = List.map2 (fun (label, _) v -> label, v) branches el in
285
    { expr with expr_desc = Expr_merge (id, branches') }, l', eqs', asserts', annots'
286

    
287
and inline_node ?(selection_on_annotation=false) node nodes =
288
  try copy_node (Hashtbl.find inline_table node.node_id)
289
  with Not_found ->
290
  let inline_expr = inline_expr ~selection_on_annotation:selection_on_annotation in
291
  let new_locals, eqs, asserts, annots = 
292
    List.fold_left (fun (locals, eqs, asserts, annots) eq ->
293
      let eq_rhs', locals', new_eqs', asserts', annots' = 
294
	inline_expr eq.eq_rhs locals node nodes 
295
      in
296
      locals', { eq with eq_rhs = eq_rhs' }::new_eqs'@eqs, asserts'@asserts, annots'@annots
297
    ) (node.node_locals, [], node.node_asserts, node.node_annot) (get_node_eqs node)
298
  in
299
  let inlined = 
300
  { node with
301
    node_locals = new_locals;
302
    node_stmts = List.map (fun eq -> Eq eq) eqs;
303
    node_asserts = asserts;
304
    node_annot = annots;
305
  }
306
  in
307
  begin
308
    (*Format.eprintf "inline node:<< %a@.>>@." Printers.pp_node inlined;*)
309
    Hashtbl.add inline_table node.node_id inlined;
310
    inlined
311
  end
312

    
313
let inline_all_calls node nodes =
314
  let nd = match node.top_decl_desc with Node nd -> nd | _ -> assert false in
315
  { node with top_decl_desc = Node (inline_node nd nodes) }
316
    
317

    
318

    
319

    
320

    
321
let witness filename main_name orig inlined type_env clock_env =
322
  let loc = Location.dummy_loc in
323
  let rename_local_node nodes prefix id =
324
    if List.exists (check_node_name id) nodes then
325
      prefix ^ id 
326
    else
327
      id
328
  in
329
  let main_orig_node = match (List.find (check_node_name main_name) orig).top_decl_desc with
330
  Node nd -> nd | _ -> assert false in
331
  
332
  let orig_rename = rename_local_node orig "orig_" in
333
  let inlined_rename = rename_local_node inlined "inlined_" in
334
  let identity = (fun x -> x) in
335
  let is_node top = match top.top_decl_desc with Node _ -> true | _ -> false in
336
  let orig = rename_prog orig_rename identity identity orig in
337
  let inlined = rename_prog inlined_rename identity identity inlined in
338
  let nodes_origs, others = List.partition is_node orig in
339
  let nodes_inlined, _ = List.partition is_node inlined in
340

    
341
  (* One ok_i boolean variable  per output var *)
342
  let nb_outputs = List.length main_orig_node.node_outputs in
343
  let ok_ident = "OK" in
344
  let ok_i = List.map (fun id ->
345
    mkvar_decl 
346
      loc 
347
      (Format.sprintf "%s_%i" ok_ident id,
348
       {ty_dec_desc=Tydec_bool; ty_dec_loc=loc},
349
       {ck_dec_desc=Ckdec_any; ck_dec_loc=loc},
350
       false,
351
       None)
352
  ) (Utils.enumerate nb_outputs) 
353
  in
354

    
355
  (* OK = ok_1 and ok_2 and ... ok_n-1 *)
356
  let ok_output = mkvar_decl 
357
    loc 
358
    (ok_ident,
359
     {ty_dec_desc=Tydec_bool; ty_dec_loc=loc},
360
     {ck_dec_desc=Ckdec_any; ck_dec_loc=loc},
361
     false,
362
     None)
363
  in
364
  let main_ok_expr =
365
    let mkv x = mkexpr loc (Expr_ident x) in
366
    match ok_i with
367
    | [] -> assert false
368
    | [x] -> mkv x.var_id 
369
    | hd::tl -> 
370
      List.fold_left (fun accu elem -> 
371
	mkpredef_call loc "&&" [mkv elem.var_id; accu]
372
      ) (mkv hd.var_id) tl
373
  in
374

    
375
  (* Building main node *)
376

    
377
  let ok_i_eq =
378
    { eq_loc = loc;
379
      eq_lhs = List.map (fun v -> v.var_id) ok_i;
380
      eq_rhs = 
381
	let inputs = expr_of_expr_list  loc (List.map (fun v -> mkexpr loc (Expr_ident v.var_id)) main_orig_node.node_inputs) in
382
	let call_orig = 
383
	  mkexpr loc (Expr_appl ("orig_" ^ main_name, inputs, None)) in
384
	let call_inlined = 
385
	  mkexpr loc (Expr_appl ("inlined_" ^ main_name, inputs, None)) in
386
	let args = mkexpr loc (Expr_tuple [call_orig; call_inlined]) in 
387
	mkexpr loc (Expr_appl ("=", args, None))
388
    } in
389
  let ok_eq =
390
    { eq_loc = loc;
391
      eq_lhs = [ok_ident];
392
      eq_rhs = main_ok_expr;
393
    } in
394
  let main_node = {
395
    node_id = "check";
396
    node_type = Types.new_var ();
397
    node_clock = Clocks.new_var true;
398
    node_inputs = main_orig_node.node_inputs;
399
    node_outputs = [ok_output];
400
    node_locals = ok_i;
401
    node_gencalls = [];
402
    node_checks = [];
403
    node_asserts = [];
404
    node_stmts = [Eq ok_i_eq; Eq ok_eq];
405
    node_dec_stateless = false;
406
    node_stateless = None;
407
    node_spec = Some 
408
      {requires = []; 
409
       ensures = [mkeexpr loc (mkexpr loc (Expr_ident ok_ident))];
410
       behaviors = [];
411
       spec_loc = loc
412
      };
413
    node_annot = [];
414
  }
415
  in
416
  let main = [{ top_decl_desc = Node main_node; top_decl_loc = loc; top_decl_owner = filename; top_decl_itf = false }] in
417
  let new_prog = others@nodes_origs@nodes_inlined@main in
418
(*
419
  let _ = Typing.type_prog type_env new_prog in
420
  let _ = Clock_calculus.clock_prog clock_env new_prog in
421
*)
422
   
423
  let witness_file = (Options_management.get_witness_dir filename) ^ "/" ^ "inliner_witness.lus" in
424
  let witness_out = open_out witness_file in
425
  let witness_fmt = Format.formatter_of_out_channel witness_out in
426
  begin
427
    List.iter (fun vdecl -> Typing.try_unify Type_predef.type_bool vdecl.var_type vdecl.var_loc) (ok_output::ok_i);
428
    Format.fprintf witness_fmt
429
      "(* Generated lustre file to check validity of inlining process *)@.";
430
    Printers.pp_prog witness_fmt new_prog;
431
    Format.fprintf witness_fmt "@.";
432
    ()
433
  end (* xx *)
434

    
435
let global_inline basename prog type_env clock_env =
436
  (* We select the main node desc *)
437
  let main_node, other_nodes, other_tops = 
438
    List.fold_right
439
      (fun top (main_opt, nodes, others) -> 
440
	match top.top_decl_desc with 
441
	| Node nd when nd.node_id = !Options.main_node -> 
442
	  Some top, nodes, others
443
	| Node _ -> main_opt, top::nodes, others
444
	| _ -> main_opt, nodes, top::others) 
445
      prog (None, [], []) 
446
  in
447

    
448
  (* Recursively each call of a node in the top node is replaced *)
449
  let main_node = Utils.desome main_node in
450
  let main_node' = inline_all_calls main_node other_nodes in
451
  let res = List.map (fun top -> if check_node_name !Options.main_node top then main_node' else top) prog in
452
 (* Code snippet from unstable branch. May be used when reactivating witnesses. 
453
 let res = main_node'::other_tops in
454
  if !Options.witnesses then (
455
    witness 
456
      basename
457
      (match main_node.top_decl_desc  with Node nd -> nd.node_id | _ -> assert false) 
458
      prog res type_env clock_env
459
  );
460
*)
461
  res
462

    
463
let pp_inline_calls fmt prog =
464
  let local_anns = Annotations.get_expr_annotations keyword in
465
  let nodes_with_anns = List.fold_left (fun accu (k, _) -> ISet.add k accu) ISet.empty local_anns in
466
  Format.fprintf fmt "@[<v 0>Inlined expresssions in node (by tags):@ %a@]"
467
    (fprintf_list ~sep:""
468
       (fun fmt top ->
469
	 match top.top_decl_desc with
470
	 | Node nd when ISet.mem nd.node_id nodes_with_anns ->
471
	    Format.fprintf fmt "%s: {@[<v 0>%a}@]@ "
472
	      nd.node_id
473
	      (fprintf_list ~sep:"@ " (fun fmt tag -> Format.fprintf fmt "%i" tag))
474
	      (List.fold_left
475
		 (fun accu (id, tag) -> if id = nd.node_id then tag::accu else accu)
476
		 []
477
		 local_anns
478
	      )	      
479
	 (* | Node nd -> Format.fprintf fmt "%s: no inline annotations" nd.node_id *)
480
	 | _ -> ()
481
     ))
482
    prog
483
  
484
  
485
let local_inline prog (* type_env clock_env *) =
486
  Log.report ~level:2 (fun fmt -> Format.fprintf fmt ".. @[<v 2>Inlining@,");
487
  let local_anns = Annotations.get_expr_annotations keyword in
488
  let prog = 
489
    if local_anns != [] then (
490
      let nodes_with_anns = List.fold_left (fun accu (k, _) -> ISet.add k accu) ISet.empty local_anns in
491
      ISet.iter (fun node_id -> Log.report ~level:2 (fun fmt -> Format.fprintf fmt "Node %s has local expression annotations@ " node_id))
492
	nodes_with_anns;
493
      List.fold_right (fun top accu -> 
494
	( match top.top_decl_desc with
495
	| Node nd when ISet.mem nd.node_id nodes_with_anns ->
496
	   Log.report ~level:2 (fun fmt -> Format.fprintf fmt "[local inline] Processing node %s@ " nd.node_id);
497
	  let inlined_node = inline_node ~selection_on_annotation:true nd prog in
498
	  (* Format.eprintf "Before inline@.%a@.After:@.%a@." *)
499
	  (*   Printers.pp_node nd *)
500
	  (*   Printers.pp_node inlined_node; *)
501
	  { top with top_decl_desc = Node inlined_node }
502
	    
503
	| _ -> top
504
	)::accu) prog []
505
	
506
    )
507
    else (
508
      Log.report ~level:2 (fun fmt -> Format.fprintf fmt "No local inline information!@ ");
509
      prog
510
    )
511
  in
512
  Log.report ~level:2 (fun fmt -> Format.fprintf fmt "@]@,");
513
  prog
514

    
515
(* Local Variables: *)
516
(* compile-command:"make -C .." *)
517
(* End: *)