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(*
* haXe/C# & Java Compiler
* Copyright (c)2011 Caue Waneck
* based on and including code by (c)2005-2008 Nicolas Cannasse
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
 
(*
Gen Common API
This module intends to be a common set of utilities common to all targets.
It's intended to provide a set of tools to be able to make targets in haXe more easily, and to
allow the programmer to have more control of how the target language will handle the program.
For example, as of now, the hxcpp target, while greatly done, relies heavily on cpp's own operator
overloading, and implicit conversions, which make it very hard to deliver a similar solution for languages
that lack these features.
So this little framework is here so you can manipulate the HaXe AST and start bringing the AST closer
to how it's intenteded to be in your host language.
Rules
Design goals
Naming convention
Weaknesses and TODO's
*)
 
open Ast
open Type
open Common
open Option
open Printf

let debug_type_ctor = function
  | TMono _ -> "TMono"
  | TEnum _ -> "TEnum"
  | TInst _ -> "TInst"
  | TType _ -> "TType"
  | TFun _ -> "TFun"
  | TAnon _ -> "TAnon"
  | TDynamic _ -> "TDynamic"
  | TLazy _ -> "TLazy"
  
let debug_type = (s_type (print_context()))

let debug_expr = s_expr debug_type

let follow_once t =
  match t with
| TMono r ->
(match !r with
| Some t -> t
| _ -> t_dynamic (* avoid infinite loop / should be the same in this context *))
| TLazy f ->
!f()
| TType (t,tl) ->
apply_params t.t_types tl t.t_type
| _ -> t

let t_empty = TAnon({ a_fields = PMap.empty; a_status = ref (Closed) })

(* the undefined is a special var that works like null, but can have special meaning *)
let v_undefined = alloc_var "__undefined__" t_dynamic

let undefined pos = { eexpr = TLocal(v_undefined); etype = t_dynamic; epos = pos }

module ExprHashtblHelper =
struct
  type hash_texpr_t =
  {
    hepos : pos;
    heexpr : int;
    hetype : int;
  }
  
  let mk_heexpr = function
    | TConst _ -> 0 | TLocal _ -> 1 | TEnumField _ -> 2 | TArray _ -> 3 | TBinop _ -> 4 | TField _ -> 5 | TClosure _ -> 6 | TTypeExpr _ -> 7 | TParenthesis _ -> 8 | TObjectDecl _ -> 9
    | TArrayDecl _ -> 10 | TCall _ -> 11 | TNew _ -> 12 | TUnop _ -> 13 | TFunction _ -> 14 | TVars _ -> 15 | TBlock _ -> 16 | TFor _ -> 17 | TIf _ -> 18 | TWhile _ -> 19
    | TSwitch _ -> 20 | TMatch _ -> 21 | TTry _ -> 22 | TReturn _ -> 23 | TBreak -> 24 | TContinue -> 25 | TThrow _ -> 26 | TCast _ -> 27
  
  let mk_heetype = function
    | TMono _ -> 0 | TEnum _ -> 1 | TInst _ -> 2 | TType _ -> 3 | TFun _ -> 4
    | TAnon _ -> 5 | TDynamic _ -> 6 | TLazy _ -> 7
  
  let mk_type e =
    {
      hepos = e.epos;
      heexpr = mk_heexpr e.eexpr;
      hetype = mk_heetype e.etype;
    }
end;;

open ExprHashtblHelper;;
(* Expression Hashtbl. This shouldn't be kept indefinately as it's not a weak Hashtbl. *)
module ExprHashtbl = Hashtbl.Make(
    struct
      type t = Type.texpr
      
      let equal = (==)
      let hash t = Hashtbl.hash (mk_type t)
    end
);;

(* ******************************************* *)
(* Gen Common

This is the key module for generation of Java and C# sources
In order for both modules to share as much code as possible, some
rules were devised:

- every feature has its own submodule, and may contain the following methods:
- configure
sets all the configuration variables for the module to run. If a module has this method,
it *should* be called once before running any filter
- run_filter ->
runs the filter immediately on the context
- add_filter ->
adds the filter to an expr->expr list. Most filter modules will provide this option so the filter
function can only run once.
- most submodules will have side-effects so the order of operations will matter.
When running configure / add_filter this might be taken care of with the rule-based dispatch system working
underneath, but still there might be some incompatibilities. There will be an effort to document it.
The modules can hint on the order by suffixing their functions with _first or _last.
- any of those methods might have different parameters, that configure how the filter will run.
For example, a simple filter that maps switch() expressions to if () .. else if... might receive
a function that filters what content should be mapped
- Other targets can use those filters on their own code. In order to do that,
a simple configuration step is needed: you need to initialize a generator_ctx type with
Gencommon.new_gen (context:Common.context)
with a generator_ctx context you will be able to add filters to your code, and execute them with
Gencommon.run_filters (gen_context:Gencommon.generator_ctx)
After running the filters, you can run your own generator normally.
(* , or you can run
Gencommon.generate_modules (gen_context:Gencommon.generator_ctx) (extension:string) (module_gen:module_type list->bool)
where module_gen will take a whole module (can be *)

*)

(* ******************************************* *)
(* common helpers *)
(* ******************************************* *)

let assertions = false (* when assertions == true, many assertions will be made to guarantee the quality of the data input *)
let debug_mode = ref false
let trace s = if !debug_mode then print_endline s else ()
let timer name = if !debug_mode then Common.timer name else fun () -> ()

let is_string t = match follow t with | TInst({ cl_path = ([], "String") }, []) -> true | _ -> false

(* helper function for creating Anon types of class / enum modules *)

let anon_of_classtype cl =
  TAnon {
    a_fields = cl.cl_statics;
    a_status = ref (Statics cl)
  }
  
let anon_of_enum e =
  TAnon {
    a_fields = PMap.empty;
    a_status = ref (EnumStatics e)
  }

let anon_of_mt mt = match mt with
  | TClassDecl cl -> anon_of_classtype cl
  | TEnumDecl e -> anon_of_enum e
  | _ -> assert false
  
let anon_class t =
    match follow t with
      | TAnon anon ->
        (match !(anon.a_status) with
          | Statics (cl) -> Some(TClassDecl(cl))
          | EnumStatics (e) -> Some(TEnumDecl(e))
          | _ -> None)
      | _ -> None

let path_s path =
  match path with | ([], s) -> s | (p, s) -> (String.concat "." (fst path)) ^ "." ^ (snd path)
 
 let rec t_to_md t = match t with
  | TInst (cl,_) -> TClassDecl cl
  | TEnum (e,_) -> TEnumDecl e
  | TType (t,_) -> TTypeDecl t
  | TAnon anon ->
    (match !(anon.a_status) with
      | EnumStatics e -> TEnumDecl e
      | Statics cl -> TClassDecl cl
      | _ -> assert false)
  | TLazy f -> t_to_md (!f())
  | TMono r -> (match !r with | Some t -> t_to_md t | None -> assert false)
  | _ -> assert false
 
let get_cl mt = match mt with | TClassDecl cl -> cl | _ -> failwith ("Unexpected module type of '" ^ path_s (t_path mt) ^ "'")

let get_tdef mt = match mt with | TTypeDecl t -> t | _ -> assert false
      
let mk_mt_access mt pos = { eexpr = TTypeExpr(mt); etype = anon_of_mt mt; epos = pos }

let is_void t = match follow t with | TEnum({ e_path = ([], "Void") }, []) -> true | _ -> false

let mk_local var pos = { eexpr = TLocal(var); etype = var.v_type; epos = pos }

(* this function is used by CastDetection module *)
let get_fun t =
  match follow t with | TFun(r1,r2) -> (r1,r2) | _ -> (trace (s_type (print_context()) (follow t) )); assert false

let mk_cast t e =
  { eexpr = TCast(e, None); etype = t; epos = e.epos }

let mk_classtype_access cl pos =
  { eexpr = TTypeExpr(TClassDecl(cl)); etype = anon_of_classtype cl; epos = pos }

let mk_static_field_access_infer cl field pos params =
  try
    let cf = (PMap.find field cl.cl_statics) in
    { eexpr = TField(mk_classtype_access cl pos, field); etype = apply_params cf.cf_params params cf.cf_type; epos = pos }
  with | Not_found -> failwith ("Cannot find field " ^ field ^ " in type " ^ (path_s cl.cl_path))
  
let mk_static_field_access cl field fieldt pos =
  { eexpr = TField(mk_classtype_access cl pos, field); etype = fieldt; epos = pos }

let mk_static_closure_access cl field fieldt pos =
  { eexpr = TClosure(mk_classtype_access cl pos, field); etype = fieldt; epos = pos }

(* stolen from Hugh's sources ;-) *)
(* this used to be a class, but there was something in there that crashed ocaml native compiler in windows *)
module SourceWriter =
struct

  type source_writer =
  {
    sw_buf : Buffer.t;
    mutable sw_has_content : bool;
    mutable sw_indent : string;
    mutable sw_indents : string list;
  }

  let new_source_writer () =
    {
      sw_buf = Buffer.create 0;
      sw_has_content = false;
      sw_indent = "";
      sw_indents = [];
    }
  
  let contents w = Buffer.contents w.sw_buf
  
  let len w = Buffer.length w.sw_buf
  
  let write w x =
    (if not w.sw_has_content then begin w.sw_has_content <- true; Buffer.add_string w.sw_buf w.sw_indent; Buffer.add_string w.sw_buf x; end else Buffer.add_string w.sw_buf x);
    let len = (String.length x)-1 in
    if len >= 0 && String.get x len = '\n' then begin w.sw_has_content <- false end else w.sw_has_content <- true

  let push_indent w = w.sw_indents <- "\t"::w.sw_indents; w.sw_indent <- String.concat "" w.sw_indents

  let pop_indent w =
    match w.sw_indents with
      | h::tail -> w.sw_indents <- tail; w.sw_indent <- String.concat "" w.sw_indents
      | [] -> w.sw_indent <- "/*?*/"
    
  let newline w = write w "\n"
  
  let begin_block w = (if w.sw_has_content then newline w); write w "{"; push_indent w; newline w

  let end_block w = pop_indent w; (if w.sw_has_content then newline w); write w "}"; newline w

  let print w =
    (if not w.sw_has_content then begin w.sw_has_content <- true; Buffer.add_string w.sw_buf w.sw_indent end);
    bprintf w.sw_buf;
  
end;;

(* rule_dispatcher's priority *)
type priority =
  | PFirst
  | PLast
  | PZero
  | PCustom of float

exception DuplicateName of string
exception NoRulesApplied

let indent = ref []

(* the rule dispatcher is the primary way to deal with distributed "plugins" *)
(* we will define rules that will form a distributed / extensible match system *)
class ['tp, 'ret] rule_dispatcher name ignore_not_found =
  object(self)
  val tbl = Hashtbl.create 16
  val mutable keys = []
  val names = Hashtbl.create 16
  val mutable temp = 0
  
  method add ?(name : string option) (* name helps debugging *) ?(priority : priority = PZero) (rule : 'tp->'ret option) =
    let p = match priority with
      | PFirst -> infinity
      | PLast -> neg_infinity
      | PZero -> 0.0
      | PCustom i -> i
    in
    
    let q = if not( Hashtbl.mem tbl p ) then begin
      let q = Stack.create() in
      Hashtbl.add tbl p q;
      keys <- p :: keys;
      keys <- List.sort (fun x y -> - (compare x y)) keys;
      q
    end else Hashtbl.find tbl p in
    let name = match name with
      | None -> temp <- temp + 1; "$_" ^ (string_of_int temp)
      | Some s -> s
    in
    (if Hashtbl.mem names name then raise (DuplicateName(name)));
    Hashtbl.add names name q;
    
    Stack.push (name, rule) q
  
  method describe =
    Hashtbl.iter (fun s _ -> (trace s)) names;
  
  method remove (name : string) =
    if Hashtbl.mem names name then begin
      let q = Hashtbl.find names name in
      let q_temp = Stack.create () in
      Stack.iter (function
        | (n, _) when n = name -> ()
        | _ as r -> Stack.push r q_temp
      ) q;
      
      Stack.clear q;
      Stack.iter (fun r -> Stack.push r q) q_temp;
      
      Hashtbl.remove names name;
      true
    end else false
    
  method run_f tp = get (self#run tp)
  
  method did_run tp = is_some (self#run tp)
  
  method get_list =
    let ret = ref [] in
    List.iter (fun key ->
      let q = Hashtbl.find tbl key in
      Stack.iter (fun (_, rule) -> ret := rule :: !ret) q
    ) keys;
    
    List.rev !ret
  
  method run_from (priority:float) (tp:'tp) : 'ret option =
    let ok = ref ignore_not_found in
    let ret = ref None in
    indent := "\t" :: !indent;
    
    (try begin
      List.iter (fun key ->
        if key < priority then begin
          let q = Hashtbl.find tbl key in
          Stack.iter (fun (n, rule) ->
            let t = if !debug_mode then Common.timer ("rule dispatcher rule: " ^ n) else fun () -> () in
            let r = rule(tp) in
            t();
            if is_some r then begin ret := r; raise Exit end
          ) q
        end
      ) keys
      
    end with Exit -> ok := true);
    
    (match !indent with
      | [] -> ()
      | h::t -> indent := t);
    
    (if not (!ok) then raise NoRulesApplied);
    !ret
  
  method run (tp:'tp) : 'ret option =
    self#run_from infinity tp
    
end;;

(* this is a special case where tp = tret and you stack their output as the next's input *)
class ['tp] rule_map_dispatcher name =
  object(self)
  inherit ['tp, 'tp] rule_dispatcher name true as super
  
  method run_f tp = get (self#run tp)
  
  method run_from (priority:float) (tp:'tp) : 'ret option =
    let cur = ref tp in
    (try begin
      List.iter (fun key ->
        
        if key < priority then begin
          let q = Hashtbl.find tbl key in
          Stack.iter (fun (n, rule) ->
            trace ("running rule " ^ n);
            let t = if !debug_mode then Common.timer ("rule map dispatcher rule: " ^ n) else fun () -> () in
            let r = rule(!cur) in
            t();
            if is_some r then begin cur := get r end
          ) q
        end
      ) keys
      
    end with Exit -> ());
    Some (!cur)
    
end;;


type generator_ctx =
{
  (* these are the basic context fields. If another target is using this context, *)
  (* this is all you need to care about *)
  mutable gcon : Common.context;
  
  gclasses : gen_classes;
  
  gtools : gen_tools;
  
  (*
configurable function that receives a desired name and makes it "internal", doing the best
to ensure that it will not be called from outside.
To avoid name clashes between internal names, user must specify two strings: a "namespace" and the name itself
*)
  mutable gmk_internal_name : string->string->string;
  
  (*
module filters run before module filters and they should generate valid haxe syntax as a result.
Module filters shouldn't go through the expressions as it adds an unnecessary burden to the GC,
and it can all be done in a single step with gexpr_filters and proper priority selection.
As a convention, Module filters should end their name with Modf, so they aren't mistaken with expression filters
*)
  gmodule_filters : (module_type) rule_map_dispatcher;
  
  (*
expression filters are the most common filters to be applied.
They should also generate only valid haxe expressions, so e.g. calls to non-existant methods
should be avoided, although there are some ways around them (like gspecial_methods)
*)
  gexpr_filters : (texpr) rule_map_dispatcher;
  (*
syntax filters are also expression filters but they no longer require
that the resulting expressions be valid haxe expressions.
They then have no guarantee that either the input expressions or the output one follow the same
rules as normal haxe code.
*)
  gsyntax_filters : (texpr) rule_map_dispatcher;
  
  (* these are more advanced features, but they would require a rewrite of targets *)
  (* they are just helpers to ditribute functions like "follow" or "type to string" *)
  (* so adding a module will already take care of correctly following a certain type of *)
  (* variable, for example *)
  
  (* follows the type through typedefs, lazy typing, etc. *)
  (* it's the place to put specific rules to handle typedefs, like *)
  (* other basic types like UInt *)
  gfollow : (t, t) rule_dispatcher;
  
  gtypes : (path, module_type) Hashtbl.t;
  
  (* cast detection helpers / settings *)
  (* this is a cache for all field access types *)
  greal_field_types : (path * string, (tclass_field (* does the cf exist *) * t (*cf's type in relation to current class type params *) ) option) Hashtbl.t;
  (* this function allows any code to handle casts as if it were inside the cast_detect module *)
  mutable ghandle_cast : t->t->texpr->texpr;
  (* when an unsafe cast is made, we can warn the user *)
  mutable gon_unsafe_cast : t->t->pos->unit;
  (* does this type needs to be boxed? Normally always false, unless special type handling must be made *)
  mutable gneeds_box : t->bool;
  (* does this 'special type' needs cast to this other type? *)
  (* this is here so we can implement custom behavior for "opaque" typedefs *)
  mutable gspecial_needs_cast : t->t->bool;
  (* sometimes we may want to support unrelated conversions on cast detection *)
  (* for example, haxe.lang.Null<T> -> T on C# *)
  (* every time an unrelated conversion is found, each to/from path is searched on this hashtbl *)
  (* if found, the function will be executed with from_type, to_type. If returns true, it means that *)
  (* it is a supported conversion, and the unsafe cast routine changes to a simple cast *)
  gsupported_conversions : (path, t->t->bool) Hashtbl.t;
  
  (* API for filters *)
  (* add type can be called at any time, and will add a new module_def that may or may not be filtered *)
  (* module_type -> should_filter *)
  mutable gadd_type : module_type -> bool -> unit;
  (* during expr filters, add_to_module will be available so module_types can be added to current module_def. we must pass the priority argument so the filters can be resumed *)
  mutable gadd_to_module : module_type -> float -> unit;
  (* during expr filters, shows the current class path *)
  mutable gcurrent_path : path;
  (* current class *)
  mutable gcurrent_class : tclass option;
  (* current class field, if any *)
  mutable gcurrent_classfield : tclass_field option;
  
  (* events *)
  (* is executed once every new classfield *)
  mutable gon_classfield_start : (unit -> unit) list;
  (* is executed once every new module type *)
  mutable gon_new_module_type : (unit -> unit) list;
  (* after expression filters ended *)
  mutable gafter_expr_filters_ended : (unit -> unit) list;
  (* after all filters are run *)
  mutable gafter_filters_ended : (unit -> unit) list;
  
  mutable gbase_class_fields : (string, tclass_field) PMap.t;
  
  (* real type is the type as it is read by the target. *)
  (* This function is here because most targets don't have *)
  (* a 1:1 translation between haxe types and its native types *)
  (* But types aren't changed to this representation as we might lose *)
  (* some valuable type information in the process *)
  mutable greal_type : t -> t;
  (*
the same as greal_type but for type parameters.
*)
  mutable greal_type_param : module_type -> tparams -> tparams;
  (*
is the type a value type?
This may be used in some optimizations where reference types and value types
are handled differently. At first the default is very good to use, and if tweaks are needed,
it's best to be done by adding @:struct meta to the value types
*
mutable gis_value_type : t -> bool;*)
  
  (* misc configuration *)
  (*
Should the target allow type parameter dynamic conversion,
or should we add a cast to those cases as well?
*)
  mutable gallow_tp_dynamic_conversion : bool;
  
  (*
Does the target support type parameter constraints?
If not, they will be ignored when detecting casts
*)
  mutable guse_tp_constraints : bool;
  
  (* internal apis *)
  (* param_func_call : used by TypeParams and CastDetection *)
  mutable gparam_func_call : texpr->texpr->tparams->texpr list->texpr;
  (* does it already have a type parameter cast handler? This is used by CastDetect to know if it should handle type parameter casts *)
  mutable ghas_tparam_cast_handler : bool;
  (* type parameter casts - special cases *)
  (* function cast_from, cast_to -> texpr *)
  gtparam_cast : (path, (texpr->t->texpr)) Hashtbl.t;
  
  (*
special vars are used for adding special behavior to
*)
  gspecial_vars : (string, bool) Hashtbl.t;
}

and gen_classes =
{
  cl_reflect : tclass;
  cl_type : tclass;
  cl_class : tclass;
  cl_enum : tclass;
  cl_dyn : tclass;
  
  t_iterator : tdef;
}

(* add here all reflection transformation additions *)
and gen_tools =
{
  (* (klass : texpr, t : t) : texpr *)
  mutable r_create_empty : texpr->t->texpr;
  (* (expr : texpr) -> texpr *)
  mutable r_get_class : texpr->texpr;
  (* Reflect.fields(). The bool is if we are iterating in a read-only manner. If it is read-only we might not need to allocate a new array *)
  mutable r_fields : bool->texpr->texpr;
  (* (first argument = return type. should be void in most cases) Reflect.setField(obj, field, val) *)
  mutable r_set_field : t->texpr->texpr->texpr->texpr;
  (* Reflect.field. bool indicates if is safe (no error throwing) or unsafe; t is the expected return type true = safe *)
  mutable r_field : bool->t->texpr->texpr->texpr;
  
  (*
these are now the functions that will later be used when creating the reflection classes
*)
  
  (* on the default implementation (at OverloadingCtors), it will be new SomeClass<params>(EmptyInstance) *)
  mutable rf_create_empty : tclass->tparams->pos->texpr;
}

let get_type types path =
  List.find (fun md -> match md with
    | TClassDecl cl when cl.cl_path = path -> true
    | TEnumDecl e when e.e_path = path -> true
    | TTypeDecl t when t.t_path = path -> true
    | _ -> false
  ) types

let new_ctx con =
  let types = Hashtbl.create (List.length con.types) in
  List.iter (fun mt ->
    match mt with
      | TClassDecl cl -> Hashtbl.add types cl.cl_path mt
      | TEnumDecl e -> Hashtbl.add types e.e_path mt
      | TTypeDecl t -> Hashtbl.add types t.t_path mt
  ) con.types;
  
  let rec gen = {
    gcon = con;
    gclasses = {
      cl_reflect = get_cl (get_type con.types ([], "Reflect"));
      cl_type = get_cl (get_type con.types ([], "Type"));
      cl_class = get_cl (get_type con.types ([], "Class"));
      cl_enum = get_cl (get_type con.types ([], "Enum"));
      cl_dyn = get_cl (get_type con.types ([], "Dynamic"));
      
      t_iterator = get_tdef (get_type con.types ([], "Iterator"));
    };
    gtools = {
      r_create_empty = (fun eclass t ->
        let fieldcall = mk_static_field_access_infer gen.gclasses.cl_type "createEmptyInstance" eclass.epos [t] in
        { eexpr = TCall(fieldcall, [eclass]); etype = t; epos = eclass.epos }
      );
      r_get_class = (fun expr ->
        let fieldcall = mk_static_field_access_infer gen.gclasses.cl_type "getClass" expr.epos [expr.etype] in
        let t = TInst(gen.gclasses.cl_class, [expr.etype]) in
        { eexpr = TCall(fieldcall, [expr]); etype = t; epos = expr.epos }
      );
      r_fields = (fun is_used_only_by_iteration expr ->
        let fieldcall = mk_static_field_access_infer gen.gclasses.cl_reflect "fields" expr.epos [] in
        { eexpr = TCall(fieldcall, [expr]); etype = gen.gcon.basic.tarray gen.gcon.basic.tstring; epos = expr.epos }
      );
      (* Reflect.setField(obj, field, val). t by now is ignored. FIXME : fix this implementation *)
      r_set_field = (fun t obj field v ->
        let fieldcall = mk_static_field_access_infer gen.gclasses.cl_reflect "setField" v.epos [] in
        { eexpr = TCall(fieldcall, [obj; field; v]); etype = t_dynamic; epos = v.epos }
      );
      (* Reflect.field. bool indicates if is safe (no error throwing) or unsafe. true = safe *)
      r_field = (fun is_safe t obj field ->
        let fieldcall = mk_static_field_access_infer gen.gclasses.cl_reflect "field" obj.epos [] in
        (* FIXME: should we see if needs to cast? *)
        mk_cast t { eexpr = TCall(fieldcall, [obj; field]); etype = t_dynamic; epos = obj.epos }
      );
      
      rf_create_empty = (fun cl p pos ->
        gen.gtools.r_create_empty { eexpr = TTypeExpr(TClassDecl cl); epos = pos; etype = TInst(gen.gclasses.cl_class,[TInst(cl,List.map (fun _ -> t_dynamic) p)]) } (TInst(cl,p))
      ); (* TODO: Maybe implement using normal reflection? Type.createEmpty(MyClass) *)
    };
    gmk_internal_name = (fun ns s -> sprintf "__%s_%s" ns s);
    gexpr_filters = new rule_map_dispatcher "gexpr_filters";
    gmodule_filters = new rule_map_dispatcher "gmodule_filters";
    gsyntax_filters = new rule_map_dispatcher "gsyntax_filters";
    gfollow = new rule_dispatcher "gfollow" false;
    gtypes = types;
    
    greal_field_types = Hashtbl.create 0;
    ghandle_cast = (fun to_t from_t e -> mk_cast to_t e);
    gon_unsafe_cast = (fun t t2 pos -> (gen.gcon.warning ("Type " ^ (debug_type t2) ^ " is being cast to the unrelated type " ^ (s_type (print_context()) t)) pos));
    gneeds_box = (fun t -> false);
    gspecial_needs_cast = (fun to_t from_t -> true);
    gsupported_conversions = Hashtbl.create 0;
    
    gadd_type = (fun md should_filter ->
      if should_filter then begin
        con.types <- md :: con.types;
        con.modules <- { m_id = alloc_mid(); m_path = (t_path md); m_types = [md]; m_extra = module_extra "" "" 0. MFake } :: con.modules
      end else gen.gafter_filters_ended <- (fun () ->
        con.types <- md :: con.types;
        con.modules <- { m_id = alloc_mid(); m_path = (t_path md); m_types = [md]; m_extra = module_extra "" "" 0. MFake } :: con.modules
      ) :: gen.gafter_filters_ended;
    );
    gadd_to_module = (fun md pr -> failwith "module added outside expr filters");
    gcurrent_path = ([],"");
    gcurrent_class = None;
    gcurrent_classfield = None;
    
    gon_classfield_start = [];
    gon_new_module_type = [];
    gafter_expr_filters_ended = [];
    gafter_filters_ended = [];
    
    gbase_class_fields = PMap.empty;
    
    greal_type = (fun t -> t);
    greal_type_param = (fun _ t -> t);
    
    (*gis_value_type = (fun t -> match follow t with
| TInst({ cl_path = ([],"Int") },[])
| TInst({ cl_path = "Float" },[])
| TInst({ cl_path = "Bool" },[]) -> true
| TInst(cl,[]) when has_meta ":struct" cl.cl_meta -> true
| TEnum(e,[]) when has_meta ":struct" e.e_meta -> true
| _ -> false);*)

    gallow_tp_dynamic_conversion = false;
    
    guse_tp_constraints = false;
    
    (* as a default, ignore the params *)
    gparam_func_call = (fun ecall efield params elist -> { ecall with eexpr = TCall(efield, elist) });
    ghas_tparam_cast_handler = false;
    gtparam_cast = Hashtbl.create 0;
    
    gspecial_vars = Hashtbl.create 0;
  } in
  
  (*gen.gtools.r_create_empty <-
gen.gtools.r_get_class <-
gen.gtools.r_fields <- *)
  
  gen

let init_ctx gen =
  (* ultimately add a follow once handler as the last follow handler *)
  let follow_f = gen.gfollow#run in
  let follow t =
    match t with
    | TMono r ->
      (match !r with
      | Some t -> follow_f t
      | _ -> Some t)
    | TLazy f ->
      follow_f (!f())
    | TType (t,tl) ->
      follow_f (apply_params t.t_types tl t.t_type)
    | _ -> Some t
  in
  gen.gfollow#add ~name:"final" ~priority:PLast follow

(* run_follow (gen:generator_ctx) (t:t) *)
let run_follow gen = gen.gfollow#run_f

let reorder_modules gen =
  let modules = Hashtbl.create 20 in
  List.iter (fun md ->
    Hashtbl.add modules ( (t_infos md).mt_module ).m_path md
  ) gen.gcon.types;
  
  let con = gen.gcon in
  con.modules <- [];
  let processed = Hashtbl.create 20 in
  Hashtbl.iter (fun md_path _ ->
    if not (Hashtbl.mem processed md_path) then begin
      Hashtbl.add processed md_path true;
      con.modules <- { m_id = alloc_mid(); m_path = md_path; m_types = List.rev ( Hashtbl.find_all modules md_path ); m_extra = module_extra "" "" 0. MFake } :: con.modules
    end
  ) modules

let run_filters_from gen t filters =
  match t with
      | TClassDecl c ->
        trace (snd c.cl_path);
        gen.gcurrent_path <- c.cl_path;
        gen.gcurrent_class <- Some(c);
        
        List.iter (fun fn -> fn()) gen.gon_new_module_type;
        
        gen.gcurrent_classfield <- None;
        let process_field f =
          gen.gcurrent_classfield <- Some(f);
          List.iter (fun fn -> fn()) gen.gon_classfield_start;
          
          trace f.cf_name;
          match f.cf_expr with
          | None -> ()
          | Some e ->
            f.cf_expr <- Some (List.fold_left (fun e f -> f e) e filters)
        in
        List.iter process_field c.cl_ordered_fields;
        List.iter process_field c.cl_ordered_statics;
        
        gen.gcurrent_classfield <- None;
        (match c.cl_constructor with
        | None -> ()
        | Some f -> process_field f);
        (match c.cl_init with
        | None -> ()
        | Some e ->
          c.cl_init <- Some (List.fold_left (fun e f -> f e) e filters));
      | TEnumDecl _ -> ()
      | TTypeDecl _ -> ()

let run_filters gen =
  (* first of all, we have to make sure that the filters won't trigger a major Gc collection *)
  let t = Common.timer "gencommon_filters" in
  (if Common.defined gen.gcon "gencommon_debug" then debug_mode := true);
  let run_filters filter =
    let rec loop acc mds =
      match mds with
        | [] -> acc
        | md :: tl ->
          let filters = [ filter#run_f ] in
          let added_types = ref [] in
          gen.gadd_to_module <- (fun md_type priority ->
            gen.gcon.types <- md_type :: gen.gcon.types;
            added_types := (md_type, priority) :: !added_types
          );
          
          run_filters_from gen md filters;
        
          let added_types = List.map (fun (t,p) ->
            run_filters_from gen t [ fun e -> get (filter#run_from p e) ];
            if Hashtbl.mem gen.gtypes (t_path t) then begin
              let rec loop i =
                let p = t_path t in
                let new_p = (fst p, snd p ^ "_" ^ (string_of_int i)) in
                if Hashtbl.mem gen.gtypes new_p then
                  loop (i+1)
                else
                  match t with
                    | TClassDecl cl -> cl.cl_path <- new_p
                    | TEnumDecl e -> e.e_path <- new_p
                    | TTypeDecl t -> ()
              in
              loop 0
            end;
            Hashtbl.add gen.gtypes (t_path t) t;
            t
          ) !added_types in
          
          loop (added_types @ (md :: acc)) tl
    in
    List.rev (loop [] gen.gcon.types)
  in
  
  let run_mod_filter filter =
    let last_add_to_module = gen.gadd_to_module in
    let added_types = ref [] in
    gen.gadd_to_module <- (fun md_type priority ->
      Hashtbl.add gen.gtypes (t_path md_type) md_type;
      added_types := (md_type, priority) :: !added_types
    );
    
    let rec loop processed not_processed =
      match not_processed with
        | hd :: tl ->
          let new_hd = filter#run_f hd in
          
          let added_types_new = !added_types in
          added_types := [];
          let added_types = List.map (fun (t,p) ->
            get (filter#run_from p t)
          ) added_types_new in
          
          loop ( added_types @ (new_hd :: processed) ) tl
        | [] ->
          processed
    in
    
    let filtered = loop [] gen.gcon.types in
    gen.gadd_to_module <- last_add_to_module;
    gen.gcon.types <- List.rev (filtered)
  in
  
  run_mod_filter gen.gmodule_filters;
  
  let last_add_to_module = gen.gadd_to_module in
  gen.gcon.types <- run_filters gen.gexpr_filters;
  gen.gadd_to_module <- last_add_to_module;
  
  List.iter (fun fn -> fn()) gen.gafter_expr_filters_ended;
  (* Codegen.post_process gen.gcon.types [gen.gexpr_filters#run_f]; *)
  gen.gcon.types <- run_filters gen.gsyntax_filters;
  List.iter (fun fn -> fn()) gen.gafter_filters_ended;
  
  reorder_modules gen;
  t()

(* ******************************************* *)
(* basic generation module that source code compilation implementations can use *)
(* ******************************************* *)

let write_file gen w source_dir path extension =
  let t = timer "write file" in
  let s_path = gen.gcon.file ^ "/" ^ source_dir ^ "/" ^ (String.concat "/" (fst path)) ^ "/" ^ (snd path) ^ "." ^ (extension) in
  (* create the folders if they don't exist *)
  let rec create acc = function
    | [] -> ()
    | d :: l ->
        let dir = String.concat "/" (List.rev (d :: acc)) in
        if not (Sys.file_exists dir) then Unix.mkdir dir 0o755;
        create (d :: acc) l
  in
  let p = gen.gcon.file :: source_dir :: fst path in
  create [] p;
  
  let contents = SourceWriter.contents w in
  let should_write = if not (Common.defined gen.gcon "replace_files") && Sys.file_exists s_path then begin
    let in_file = open_in s_path in
    let old_contents = Std.input_all in_file in
    close_in in_file;
    contents <> old_contents
  end else true in
  
  if should_write then begin
    let f = open_out s_path in
    output_string f contents;
    close_out f
  end;
  t()
  
let dump_descriptor gen name path_s =
  let w = SourceWriter.new_source_writer () in
  (* dump called path *)
  SourceWriter.write w (Sys.getcwd());
  SourceWriter.newline w;
  (* dump all defines *)
  SourceWriter.write w "begin defines";
  SourceWriter.newline w;
  PMap.iter (fun name _ ->
    SourceWriter.write w name;
    SourceWriter.newline w
  ) gen.gcon.defines;
  SourceWriter.write w "end defines";
  SourceWriter.newline w;
  (* dump all generated types *)
  SourceWriter.write w "begin modules";
  SourceWriter.newline w;
  List.iter (fun md_def ->
    SourceWriter.write w "M ";
    SourceWriter.write w (path_s md_def.m_path);
    SourceWriter.newline w;
    List.iter (fun m ->
      match m with
        | TClassDecl cl when not cl.cl_extern ->
          SourceWriter.write w "C ";
          SourceWriter.write w (path_s cl.cl_path);
          SourceWriter.newline w
        | TEnumDecl e when not e.e_extern ->
          SourceWriter.write w "E ";
          SourceWriter.write w (path_s e.e_path);
          SourceWriter.newline w
        | _ -> () (* still no typedef is generated *)
    ) md_def.m_types
  ) gen.gcon.modules;
  SourceWriter.write w "end modules";
  SourceWriter.newline w;
  (* dump all resources *)
  (match gen.gcon.main_class with
    | Some path ->
      SourceWriter.write w "begin main";
      SourceWriter.newline w;
      SourceWriter.write w (path_s path);
      SourceWriter.newline w;
      SourceWriter.write w "end main";
      SourceWriter.newline w
| _ -> ()
  );
  SourceWriter.write w "begin resources";
  SourceWriter.newline w;
  Hashtbl.iter (fun name _ ->
    SourceWriter.write w name;
    SourceWriter.newline w
  ) gen.gcon.resources;
  SourceWriter.write w "end resources";
  SourceWriter.newline w;
  SourceWriter.write w "begin libs";
  SourceWriter.newline w;
  if Common.defined gen.gcon "java" then
    List.iter (fun (s,_) ->
      SourceWriter.write w s;
      SourceWriter.newline w
    ) gen.gcon.java_libs;
  SourceWriter.write w "end libs";
  
  let contents = SourceWriter.contents w in
  let f = open_out (gen.gcon.file ^ "/" ^ name) in
  output_string f contents;
  close_out f
  
(*
helper function to create the source structure. Will send each module_def to the function passed.
If received true, it means that module_gen has generated this content, so the file must be saved.
See that it will write a whole module
*)
let generate_modules gen extension source_dir (module_gen : SourceWriter.source_writer->module_def->bool) =
  List.iter (fun md_def ->
    let w = SourceWriter.new_source_writer () in
    (*let should_write = List.fold_left (fun should md -> module_gen w md or should) false md_def.m_types in*)
    let should_write = module_gen w md_def in
    if should_write then begin
      let path = md_def.m_path in
      write_file gen w source_dir path extension;
      
      
    end
  ) gen.gcon.modules

let generate_modules_t gen extension source_dir change_path (module_gen : SourceWriter.source_writer->module_type->bool) =
  List.iter (fun md ->
    let w = SourceWriter.new_source_writer () in
    (*let should_write = List.fold_left (fun should md -> module_gen w md or should) false md_def.m_types in*)
    let should_write = module_gen w md in
    if should_write then begin
      let path = change_path (t_path md) in
      write_file gen w source_dir path extension;
    end
  ) gen.gcon.types
  
(*
various helper functions
*)

let mk_paren e =
  match e.eexpr with | TParenthesis _ -> e | _ -> { e with eexpr=TParenthesis(e) }
  
(* private *)
let tmp_count = ref 0
  
let mk_int gen i pos = { eexpr = TConst(TInt ( Int32.of_int i)); etype = gen.gcon.basic.tint; epos = pos }

let mk_return e = { eexpr = TReturn (Some e); etype = e.etype; epos = e.epos }
  
let mk_temp gen name t =
    incr tmp_count;
    let name = gen.gmk_internal_name "temp" (name ^ (string_of_int !tmp_count)) in
    alloc_var name t
    
let ensure_local gen block name e =
  match e.eexpr with
    | TLocal _ -> e
    | _ ->
      let var = mk_temp gen name e.etype in
      block := { e with eexpr = TVars([ var, Some e ]); etype = gen.gcon.basic.tvoid; } :: !block;
      { e with eexpr = TLocal var }

let reset_temps () = tmp_count := 0
  
let follow_module follow_func md = match md with
  | TClassDecl _
  | TEnumDecl _ -> md
  | TTypeDecl tdecl -> match (follow_func (TType(tdecl, List.map snd tdecl.t_types))) with
    | TInst(cl,_) -> TClassDecl cl
    | TEnum(e,_) -> TEnumDecl e
    | TType(t,_) -> TTypeDecl t
    | _ -> assert false
 
(*
hxgen means if the type was generated by haxe. If a type was generated by haxe, it means
it will contain special constructs for speedy reflection, for example
@see SetHXGen module
*)
let rec is_hxgen md =
  match md with
    | TClassDecl cl -> has_meta ":hxgen" cl.cl_meta
    | TEnumDecl e -> has_meta ":hxgen" e.e_meta
    | TTypeDecl t -> has_meta ":hxgen" t.t_meta || ( match follow t.t_type with | TInst(cl,_) -> is_hxgen (TClassDecl cl) | TEnum(e,_) -> is_hxgen (TEnumDecl e) | _ -> false )

let is_hxgen_t t =
  match t with
    | TInst (cl, _) -> has_meta ":hxgen" cl.cl_meta
    | TEnum (e, _) -> has_meta ":hxgen" e.e_meta
    | TType (t, _) -> has_meta ":hxgen" t.t_meta
    | _ -> false

let mt_to_t mt params =
  match mt with
    | TClassDecl (cl) -> TInst(cl, params)
    | TEnumDecl (e) -> TEnum(e, params)
    | _ -> assert false

let t_to_mt t =
  match follow t with
    | TInst(cl, _) -> TClassDecl(cl)
    | TEnum(e, _) -> TEnumDecl(e)
    | _ -> assert false

let mk_paren e =
  match e.eexpr with
    | TParenthesis _ -> e
    | _ -> { e with eexpr = TParenthesis(e) }
      
let rec get_last_ctor cl =
  Option.map_default (fun (super,_) -> if is_some super.cl_constructor then Some(get super.cl_constructor) else get_last_ctor super) None cl.cl_super
  
(* helper *)
let mk_class_field name t public pos kind params =
  {
    cf_name = name;
    cf_type = t;
    cf_public = public;
    cf_pos = pos;
    cf_doc = None;
    cf_meta = [ ":$CompilerGenerated", [], Ast.null_pos ]; (* annotate that this class field was generated by the compiler *)
    cf_kind = kind;
    cf_params = params;
    cf_expr = None;
    cf_overloads = [];
  }

let mk_iterator_access gen t expr =
  let pos = expr.epos in
  let iterator_t = TType(gen.gclasses.t_iterator, [t]) in
  { eexpr = TCall({ eexpr = TField(expr, "iterator"); etype = (TFun([],iterator_t)); epos = pos }, []); etype = iterator_t; epos = pos }
  
(* this helper just duplicates the type parameter class, which is assumed that cl is. *)
(* This is so we can use class parameters on function parameters, without running the risk of name clash *)
(* between both *)
let map_param cl =
  let ret = mk_class cl.cl_module cl.cl_path cl.cl_pos in
  ret.cl_implements <- cl.cl_implements;
  ret.cl_kind <- cl.cl_kind;
  ret
  
let get_cl_t t =
  match follow t with | TInst (cl,_) -> cl | _ -> assert false
  
let mk_class m path pos =
  let cl = Type.mk_class m path pos in
  cl.cl_meta <- [ ":$CompilerGenerated", [], Ast.null_pos ];
  cl
  
type tfield_access =
  | FClassField of tclass * tparams * tclass_field * bool (* is static? *) * t (* the actual cf type, in relation to the class type params *)
  | FEnumField of tenum * tenum_field * bool (* is parameterized enum ? *)
  | FAnonField of tclass_field
  | FDynamicField of t
  | FNotFound

let field_access gen (t:t) (field:string) : (tfield_access) =
  (*
t can be either an haxe-type as a real-type;
'follow' should be applied here since we can generalize that a TType will be accessible as its
underlying type.
*)
  
  match follow t with
    | TInst(cl, params) ->
      let orig_cl = cl in
      let orig_params = params in
      let rec not_found cl params =
        match cl.cl_dynamic with
          | Some t ->
            let t = apply_params cl.cl_types params t in
            FDynamicField t
          | None ->
            match cl.cl_super with
              | None -> FNotFound
              | Some (super,p) -> not_found super p
      in
      
      let not_found () =
        try
          let cf = PMap.find field gen.gbase_class_fields in
          FClassField (orig_cl, orig_params, cf, false, cf.cf_type)
        with
          | Not_found -> not_found cl params
      in
      
      (* this is a hack for C#'s different generic types with same path *)
      let hashtbl_field = (String.concat "" (List.map (fun _ -> "]") cl.cl_types)) ^ field in
      (try
        match Hashtbl.find gen.greal_field_types (orig_cl.cl_path, hashtbl_field) with
          | None -> not_found()
          | Some (cf, actual_t) ->
            FClassField(orig_cl, orig_params, cf, false, actual_t)
      with | Not_found ->
        let rec flatten_hierarchy cl acc =
          match cl.cl_super with
            | None -> acc
            | Some (cl,super) -> flatten_hierarchy cl ((cl,super) :: acc)
        in
        
        let hierarchy = flatten_hierarchy orig_cl [orig_cl, List.map snd orig_cl.cl_types] in
        
        let rec loop_find_cf acc =
          match acc with
            | [] ->
              Hashtbl.add gen.greal_field_types (orig_cl.cl_path, hashtbl_field) None;
              not_found()
            | (cl,params) :: tl ->
              (try
                let cf = PMap.find field cl.cl_fields in
                (* found *)
                (* get actual type *)
                let get_real_t = match cf.cf_kind with
                  | Var _ -> (fun t -> gen.greal_type t)
                  | _ -> (fun t ->
                    let args, ret = get_fun t in
                    TFun(List.map (fun (n,o,t) -> (n,o,gen.greal_type t)) args, gen.greal_type ret)
                  )
                in
                let actual_t = List.fold_left (fun t (cl,params) -> apply_params cl.cl_types (gen.greal_type_param (TClassDecl cl) params) (get_real_t t)) cf.cf_type acc in
                Hashtbl.add gen.greal_field_types (orig_cl.cl_path, hashtbl_field) (Some (cf, actual_t));
                FClassField(orig_cl, orig_params, cf, false, actual_t)
              with | Not_found ->
                loop_find_cf tl
              )
        in
        loop_find_cf hierarchy
      )
    | TEnum(e, params) ->
      (* enums have no field *) FNotFound
    | TAnon anon ->
      (try match !(anon.a_status) with
        | Statics cl ->
          let cf = PMap.find field cl.cl_statics in
          FClassField(cl, List.map (fun _ -> t_dynamic) cl.cl_types, cf, true, cf.cf_type)
        | EnumStatics e ->
          let f = PMap.find field e.e_constrs in
          let is_param = match follow f.ef_type with | TFun _ -> true | _ -> false in
          FEnumField(e, f, is_param)
        | _ when PMap.mem field gen.gbase_class_fields ->
          let cf = PMap.find field gen.gbase_class_fields in
          FClassField(gen.gclasses.cl_dyn, [t_dynamic], cf, false, cf.cf_type)
        | _ ->
          FAnonField(PMap.find field anon.a_fields)
      with | Not_found -> FNotFound)
    | _ when PMap.mem field gen.gbase_class_fields ->
      let cf = PMap.find field gen.gbase_class_fields in
      FClassField(gen.gclasses.cl_dyn, [t_dynamic], cf, false, cf.cf_type)
    | TDynamic t -> FDynamicField t
    | TMono _ -> FDynamicField t_dynamic
    | _ -> FNotFound
  
(* ******************************************* *)
(* Module dependency resolution *)
(* ******************************************* *)

type t_dependency =
  | DAfter of float
  | DBefore of float
 
exception ImpossibleDependency of string

let max_dep = 10000.0
let min_dep = - (10000.0)

let solve_deps name (deps:t_dependency list) =
  let vmin = min_dep -. 1.0 in
  let vmax = max_dep +. 1.0 in
  let rec loop dep vmin vmax =
    match dep with
      | [] ->
        (if vmin >= vmax then raise (ImpossibleDependency name));
        (vmin +. vmax) /. 2.0
      | head :: tail ->
        match head with
          | DBefore f ->
            loop tail (max vmin f) vmax
          | DAfter f ->
            loop tail vmin (min vmax f)
  in
  loop deps vmin vmax

(* type resolution *)

exception TypeNotFound of path

let get_type gen path =
  try Hashtbl.find gen.gtypes path with | Not_found -> raise (TypeNotFound path)
  
(* ******************************************* *)
(* follow all module *)
(* ******************************************* *)

(*
this module will follow each and every type using the rules defined in
gen.gfollow. This is a minor helper module, so we don't end up
having to follow the same time multiple times in the many filter iterations
because of this, it will be one of the first modules to run.
*)
module FollowAll =
struct
  
  let follow gen e =
    let follow_func = gen.gfollow#run_f in
    Some (Type.map_expr_type (fun e->e) (follow_func) (fun tvar-> tvar.v_type <- (follow_func tvar.v_type); tvar) e)
  
  let priority = max_dep
  
  (* will add an expression filter as the first filter *)
  let configure gen =
    gen.gexpr_filters#add ~name:"follow_all" ~priority:(PCustom(priority)) (follow gen)
  
end;;

(* ******************************************* *)
(* set hxgen module *)
(* ******************************************* *)

(*
goes through all module types and sets the :hxgen meta on all which
then is_hxgen_func returns true. There is a default is_hxgen_func implementation also
*)

module SetHXGen =
struct
  
  (*
basically, everything that is extern is assumed to not be hxgen, unless meta :hxgen is set, and
everything that is not extern is assumed to be hxgen, unless meta :nativegen is set
*)
  let default_hxgen_func md =
    match md with
      | TClassDecl cl ->
        let rec is_hxgen_class c =
          if c.cl_extern then begin
            if has_meta ":hxgen" c.cl_meta then true else Option.map_default (fun (c,_) -> is_hxgen_class c) false c.cl_super
          end else begin
            if has_meta ":nativegen" c.cl_meta then Option.map_default (fun (c, _) -> is_hxgen_class c) false c.cl_super else true
          end
        in
        
        is_hxgen_class cl
      | TEnumDecl e -> if e.e_extern then has_meta ":hxgen" e.e_meta else not (has_meta ":nativegen" e.e_meta)
      | TTypeDecl t -> (* TODO see when would we use this *)
        false
  
  (*
by now the only option is to run it eagerly, because it must be one of the first filters to run,
since many others depend of it
*)
  let run_filter gen is_hxgen_func =
    let filter md =
      if is_hxgen_func md then begin
        match md with
          | TClassDecl cl -> cl.cl_meta <- (":hxgen", [], cl.cl_pos) :: cl.cl_meta
          | TEnumDecl e -> e.e_meta <- (":hxgen", [], e.e_pos) :: e.e_meta
          | TTypeDecl t -> t.t_meta <- (":hxgen", [], t.t_pos) :: t.t_meta
      end
    in
    List.iter filter gen.gcon.types
  
end;;

(* ******************************************* *)
(* overloading reflection constructors *)
(* ******************************************* *)

(*
this module works on languages that support function overloading and
enable function hiding via static functions.
it takes the constructor body out of the constructor and adds it to a special ctor
static function. The static function will receive the same parameters as the constructor,
plus the special "me" var, which will replace "this"
Then it always adds two constructors to the function: one that receives a special class,
indicating that it should be constructed without any parameters, and one that receives its normal constructor.
Both will only include a super() call to the superclasses' emtpy constructor.
This enables two things:
empty construction without the need of incompatibility with the platform's native construction method
the ability to call super() constructor in any place in the constructor
This will insert itself in the default reflection-related module filter
TODO: cleanup
*)
module OverloadingConstructor =
struct
  
  let priority = 0.0
  
  let name = "overloading_constructor"
  
  let set_new_create_empty gen empty_ctor_expr =
    let old = gen.gtools.rf_create_empty in
    gen.gtools.rf_create_empty <- (fun cl params pos ->
      if is_hxgen (TClassDecl cl) then
        { eexpr = TNew(cl,params,[empty_ctor_expr]); etype = TInst(cl,params); epos = pos }
      else
        old cl params pos
    )
  
  let configure gen (empty_ctor_type : t) (empty_ctor_expr : texpr) supports_ctor_inheritance =
  
    set_new_create_empty gen empty_ctor_expr;
    
    let basic = gen.gcon.basic in
    
    let should_change cl = not cl.cl_interface && is_hxgen (TClassDecl cl) in
    
    let static_ctor_name = gen.gmk_internal_name "hx" "ctor" in
    
    let processed = Hashtbl.create (List.length gen.gcon.types) in
    
    let rec change cl =
      Hashtbl.add processed cl.cl_path true;
      
      (match cl.cl_super with
        | Some (super,_) when should_change super && not (Hashtbl.mem processed super.cl_path) ->
          change super
        | _ -> ()
      );
      
      let rec get_last_static_ctor cl params =
        match cl.cl_super with
          | None -> None
          | Some (super,tl) ->
            let params = List.map (apply_params cl.cl_types params) tl in
            if PMap.mem static_ctor_name super.cl_statics then
              Some(mk_static_field_access_infer super static_ctor_name super.cl_pos params)
            else
              get_last_static_ctor super params
      in
      
      let rec prev_ctor cl =
        match cl.cl_super with
          | None -> None
          | Some(cl,_) ->
            match cl.cl_constructor with
              | None -> prev_ctor cl
              | Some ctor -> Some ctor
      in
      
      let is_super_hxgen cl =
        match cl.cl_super with
          | None -> false
          | Some(cl, _) -> is_hxgen (TClassDecl cl)
      in
      
      (* check if we have a constructor right now *)
      let do_empty_only and_no_args_too =
        let super = match get_last_static_ctor cl (List.map snd cl.cl_types) with
          | None ->
            { eexpr = TCall({ eexpr = TConst(TSuper); etype = TInst(cl, List.map snd cl.cl_types); epos = cl.cl_pos }, []); etype = basic.tvoid; epos = cl.cl_pos }
          | Some _ ->
            { eexpr = TCall({ eexpr = TConst(TSuper); etype = TInst(cl, List.map snd cl.cl_types); epos = cl.cl_pos }, [ empty_ctor_expr ]); etype = basic.tvoid; epos = cl.cl_pos }
        in
        let empty_ctor = mk_class_field "new" (TFun(["empty",false,empty_ctor_type],basic.tvoid)) false cl.cl_pos (Method MethNormal) [] in
        empty_ctor.cf_expr <- Some {
          eexpr = TFunction {
            tf_type = basic.tvoid;
            tf_args = [alloc_var "empty" empty_ctor_type, None];
            tf_expr = mk_block super
          };
          etype = empty_ctor.cf_type;
          epos = empty_ctor.cf_pos
        };
        
        cl.cl_ordered_fields <- empty_ctor :: cl.cl_ordered_fields;
        cl.cl_fields <- PMap.add "new" empty_ctor cl.cl_fields;
        if and_no_args_too then begin
          let noargs_ctor = mk_class_field "new" (TFun([],basic.tvoid)) false cl.cl_pos (Method MethNormal) [] in
          noargs_ctor.cf_expr <- Some {
          eexpr = TFunction {
            tf_type = basic.tvoid;
            tf_args = [];
            tf_expr = mk_block super
          };
          etype = noargs_ctor.cf_type;
          epos = noargs_ctor.cf_pos
        };
        
        cl.cl_constructor <- Some noargs_ctor
        end
      in
      
      let cur_ctor =
        match cl.cl_constructor with
          | Some ctor when has_meta ":skip_ctor" cl.cl_meta ->
            if not supports_ctor_inheritance then begin
              do_empty_only false;
            end;
            None
          | Some ctor -> Some ctor
          | None ->
            (* if we don't, check if there are any previous constructors *)
            match prev_ctor cl with
              | Some ctor when not supports_ctor_inheritance ->
                (* if there are and not supports_ctor_inheritance, we need to create the constructors anyway *)
                (* create a constructor that only receives its arguments and calls super with them *)
                let new_ctor = mk_class_field "new" ctor.cf_type ctor.cf_public cl.cl_pos (Method MethNormal) [] in
                let args, _ = get_fun ctor.cf_type in
                let tf_args = List.map (fun (name,_,t) ->
                  (* the constructor will have no optional arguments, as presumably this will be handled by the underlying expr *)
                  (alloc_var name t, None)
                ) args in
                let super_call =
                {
                  eexpr = TCall(
                    { eexpr = TConst(TSuper); etype = TInst(cl, List.map snd cl.cl_types); epos = ctor.cf_pos },
                    List.map (fun (v,_) -> mk_local v ctor.cf_pos) tf_args);
                  etype = basic.tvoid;
                  epos = ctor.cf_pos
                } in
                new_ctor.cf_expr <- Some ({
                  eexpr = TFunction({
                    tf_args = tf_args;
                    tf_type = basic.tvoid;
                    tf_expr = mk_block super_call
                  });
                  etype = ctor.cf_type;
                  epos = ctor.cf_pos
                });
                cl.cl_constructor <- Some new_ctor;
                
                Some new_ctor
              | _ ->
                do_empty_only true;
                None
      in
      match cur_ctor with
        | None -> ()
        | Some ctor ->
          (* now that we are sure to have a constructor:
change its contents to reference 'me' var whenever 'this' is referenced
extract a super call, if there's one. Change the super call to either call the static function,
or if it can't (super not hxgen), make sure it's the first call. If it's not, error.
*)
          let ctor_types = List.map (fun (s,t) -> (s, TInst (map_param (get_cl_t t), []))) cl.cl_types in
          let me = mk_temp gen "me" (TInst(cl, List.map snd ctor_types)) in
          (*let me = alloc_var "me" (TInst(cl, List.map snd ctor_types)) in*)
          me.v_capture <- true;
          
          let fn_args, _ = get_fun ctor.cf_type in
          let ctor_params = List.map snd ctor_types in
          let fn_type = TFun([me.v_name, false, me.v_type] @ (List.map (fun (n,b,t) -> (n,b,apply_params cl.cl_types ctor_params t)) fn_args), basic.tvoid) in
          let cur_tf_args = match ctor.cf_expr with
            | Some({ eexpr = TFunction(tf) }) -> tf.tf_args
            | _ -> assert false
          in
          
          let changed_tf_args = List.map (fun (v,_) -> (v, None)) cur_tf_args in
          
          let local_map = Hashtbl.create (List.length cur_tf_args) in
          let static_tf_args = [ me, None ] @ List.map (fun (v,b) ->
            let new_v = alloc_var v.v_name (apply_params cl.cl_types ctor_params v.v_type) in
            Hashtbl.add local_map v.v_id new_v;
            (new_v, b)
          ) cur_tf_args in
          
          let static_ctor = mk_class_field static_ctor_name fn_type false ctor.cf_pos (Method MethNormal) ctor_types in
          
          let is_super_first =
            let rec loop e =
              match e.eexpr with
                | TBlock(hd :: tl) -> loop hd
                | TCall({ eexpr = TConst(TSuper) }, _) -> true
                | _ -> false
            in
            match ctor.cf_expr with
              | Some({ eexpr = TFunction(tf) }) ->
                loop tf.tf_expr
              | _ -> assert false
          in
          
          let super_call = ref None in
          let change_super_to, mk_supers =
            let last_static_ctor = get_last_static_ctor cl (List.map snd ctor_types) in
            let change_super_to scall params =
              super_call := Some scall;
              match last_static_ctor with
                | None ->
                  if is_super_first then
                    { eexpr = TConst(TNull); etype = t_dynamic; epos = scall.epos }
                  else
                    ( gen.gcon.error "Super call must be the first call when extending native types." scall.epos; assert false )
                | Some e -> { scall with eexpr = TCall(e, [mk_local me scall.epos] @ params) }
            in
            
            (*
with this information, create the static hx_ctor with the mapped contents, and create two constructors:
one with the actual arguments and either the actual super call(if super not hxgen), or the super to
create empty (if available), or just to empty super (if first)
the other with either the mapped arguments of the actual super call, mapped to null, or the super to
create empty, or just to empty super
*)
            let mk_supers () =
              match is_super_hxgen cl with
                | true ->
                  (* can call super empty *)
                  let ret_empty = {
                    eexpr = TCall({ eexpr = TConst(TSuper); etype = me.v_type; epos = cl.cl_pos }, [ empty_ctor_expr ]);
                    etype = basic.tvoid;
                    epos = cl.cl_pos
                  } in
                  
                  let ret = match last_static_ctor, !super_call with
                    | None, Some super ->
                      (* it has an empty constructor, but we cannot call an out of placed super *)
                      super
                    | _ -> ret_empty
                  in
                  
                  ret, ret_empty
                | false ->
                  match prev_ctor cl with
                    | None ->
                      let ret = {
                        eexpr = TCall({ eexpr = TConst(TSuper); etype = me.v_type; epos = cl.cl_pos }, []);
                        etype = basic.tvoid;
                        epos = cl.cl_pos
                      } in
                      ret, ret
                    | Some _ ->
                      let super = get (!super_call) in
                      super, match super with
                        | { eexpr = TCall(super, args) } ->
                          { super with eexpr = TCall(super, List.map (fun e -> mk_cast e.etype { e with eexpr = TConst(TNull) }) args) }
                        | _ -> assert false
            in
            change_super_to, mk_supers
          in
          
          let rec map_expr e = match e.eexpr with
            | TCall( { eexpr = TConst(TSuper) }, params ) ->
              change_super_to e (List.map map_expr params)
            | TLocal(v) ->
              (try let new_v = Hashtbl.find local_map v.v_id in { e with eexpr = TLocal(new_v); etype = new_v.v_type }
              with | Not_found -> e)
            | TConst(TThis) ->
              mk_local me e.epos
            | TNew(ncl,nparams,eparams) ->
              let cl, params = match apply_params cl.cl_types ctor_params (TInst(ncl,nparams)) with
                | TInst(cl,p) -> cl,p
                | _ -> assert false
              in
              { e with eexpr = TNew(cl, params, List.map map_expr eparams); etype = TInst(cl, params) }
            | _ -> Type.map_expr map_expr { e with etype = apply_params cl.cl_types ctor_params e.etype }
          in
          
          let mapped = match ctor.cf_expr with
            | Some({ eexpr = TFunction(tf) }) ->
              { tf with tf_args = static_tf_args; tf_expr = map_expr tf.tf_expr }
            | _ -> assert false
          in
          
          static_ctor.cf_expr <- Some { eexpr = TFunction(mapped); etype = static_ctor.cf_type; epos = ctor.cf_pos };
          let normal_super, empty_super = mk_supers () in
          
          cl.cl_ordered_statics <- static_ctor :: cl.cl_ordered_statics;
          cl.cl_statics <- PMap.add static_ctor_name static_ctor cl.cl_statics;
          
          let normal_super =
          {
            eexpr = TBlock([
              normal_super;
              {
                eexpr = TCall(
                  mk_static_field_access cl static_ctor_name (apply_params ctor_types (List.map snd cl.cl_types) fn_type) ctor.cf_pos,
                  [ { eexpr = TConst(TThis); etype = TInst(cl, List.map snd cl.cl_types); epos = cl.cl_pos } ] @ List.map (fun (v,_) -> mk_local v ctor.cf_pos) changed_tf_args
                );
                etype = basic.tvoid;
                epos = ctor.cf_pos
              }
            ]);
            etype = basic.tvoid;
            epos = ctor.cf_pos
          } in
          
          ctor.cf_expr <- Some {
            eexpr = TFunction { tf_type = basic.tvoid; tf_args = changed_tf_args; tf_expr = normal_super };
            etype = ctor.cf_type;
            epos = ctor.cf_pos;
          };
          
          let empty_ctor = mk_class_field "new" (TFun(["empty",false,empty_ctor_type],basic.tvoid)) false cl.cl_pos (Method MethNormal) [] in
          empty_ctor.cf_expr <- Some {
            eexpr = TFunction {
              tf_type = basic.tvoid;
              tf_args = [alloc_var "empty" empty_ctor_type, None];
              tf_expr = mk_block empty_super
            };
            etype = empty_ctor.cf_type;
            epos = empty_ctor.cf_pos
          };
          
          cl.cl_ordered_fields <- empty_ctor :: cl.cl_ordered_fields;
          cl.cl_fields <- PMap.add "new" empty_ctor cl.cl_fields;
          
          ()
    in
    
    let module_filter md = match md with
      | TClassDecl cl when should_change cl && not (Hashtbl.mem processed cl.cl_path) ->
        change cl;
        None
      | _ -> None
    in
    gen.gmodule_filters#add ~name:name ~priority:(PCustom priority) module_filter
  
end;;

(* ******************************************* *)
(* init function module *)
(* ******************************************* *)

(*
This module will take proper care of the init function, by taking off all expressions from static vars and putting them
in order in the init function.
It will also initialize dynamic functions, both by putting them in the constructor and in the init function
depends on:
(syntax) must run before ExprStatement module
(ok) must run before OverloadingCtor module so the constructor can be in the correct place
(syntax) must run before FunctionToClass module
*)

module InitFunction =
struct

  let name = "init_funcs"
  
  let priority = solve_deps name [DBefore OverloadingConstructor.priority]
  
  let configure gen should_handle_dynamic_functions =
    let handle_override_dynfun acc e this field =
      let add_expr = ref None in
      let v = mk_temp gen ("super_" ^ field) e.etype in
      v.v_capture <- true;
      
      let rec loop e =
        match e.eexpr with
          | TField({ eexpr = TConst(TSuper) }, f) ->
            (if f <> field then assert false);
            let local = mk_local v e.epos in
            (match !add_expr with
              | None ->
                add_expr := Some { e with eexpr = TVars([v, Some this]) }
              | Some _ -> ());
            local
          | TConst TSuper -> assert false
          | _ -> Type.map_expr loop e
      in
      let e = loop e in
      
      match !add_expr with
        | None -> e :: acc
        | Some add_expr -> add_expr :: e :: acc
    in
    
    let handle_class cl =
      let init = match cl.cl_init with
        | None -> []
        | Some i -> [i]
      in
      let init = List.fold_left (fun acc cf ->
        match cf.cf_kind, should_handle_dynamic_functions with
          | (Var _, _)
          | (Method (MethDynamic), true) ->
            (match cf.cf_expr with
              | Some e ->
                (match cf.cf_params with
                  | [] ->
                    let var = { eexpr = TField(mk_classtype_access cl cf.cf_pos, cf.cf_name); etype = cf.cf_type; epos = cf.cf_pos } in
                    let ret = ({ eexpr = TBinop(Ast.OpAssign, var, e); etype = cf.cf_type; epos = cf.cf_pos; }) in
                    cf.cf_expr <- None;
                    
                    ret :: acc
                  | _ ->
                    let params = List.map (fun _ -> t_dynamic) cf.cf_params in
                    let fn = apply_params cf.cf_params params in
                    let var = { eexpr = TField(mk_classtype_access cl cf.cf_pos, cf.cf_name); etype = fn cf.cf_type; epos = cf.cf_pos } in
                    let rec change_expr e =
                      Type.map_expr_type (change_expr) fn (fun v -> v.v_type <- fn v.v_type; v) e
                    in
                    
                    let ret = ({ eexpr = TBinop(Ast.OpAssign, var, change_expr e); etype = fn cf.cf_type; epos = cf.cf_pos; }) in
                    cf.cf_expr <- None;
                    ret :: acc
                )
              | None -> acc)
          | _ -> acc
      ) init cl.cl_ordered_statics
      in
      let init = List.rev init in
      (match init with
        | [] -> cl.cl_init <- None
        | _ -> cl.cl_init <- Some { eexpr = TBlock(init); epos = cl.cl_pos; etype = gen.gcon.basic.tvoid; });
       
      (* FIXME: find a way to tell OverloadingCtors to execute this code even with empty constructors *)
      if should_handle_dynamic_functions then begin
        let funs = List.fold_left (fun acc cf ->
          match cf.cf_kind with
            | Var _
            | Method(MethDynamic) ->
              (match cf.cf_expr, cf.cf_params with
                | Some e, [] ->
                  let var = { eexpr = TField({ eexpr = TConst(TThis); epos = cf.cf_pos; etype = TInst(cl, List.map snd cl.cl_types); }, cf.cf_name); etype = cf.cf_type; epos = cf.cf_pos } in
                  let ret = ({ eexpr = TBinop(Ast.OpAssign, var, e); etype = cf.cf_type; epos = cf.cf_pos; }) in
                  cf.cf_expr <- None;
                  let is_override = List.mem cf.cf_name cl.cl_overrides in
                  
                  if is_override then begin
                    cl.cl_ordered_fields <- List.filter (fun f -> f.cf_name <> cf.cf_name) cl.cl_ordered_fields;
                    cl.cl_fields <- PMap.remove cf.cf_name cl.cl_fields;
                    handle_override_dynfun acc ret var cf.cf_name
                  end else ret :: acc
                | Some e, _ ->
                  let params = List.map (fun _ -> t_dynamic) cf.cf_params in
                  let fn = apply_params cf.cf_params params in
                  let var = { eexpr = TField({ eexpr = TConst(TThis); epos = cf.cf_pos; etype = TInst(cl, List.map snd cl.cl_types); }, cf.cf_name); etype = cf.cf_type; epos = cf.cf_pos } in
                  let rec change_expr e =
                    Type.map_expr_type (change_expr) fn (fun v -> v.v_type <- fn v.v_type; v) e
                  in
                  
                  let ret = ({ eexpr = TBinop(Ast.OpAssign, var, change_expr e); etype = fn cf.cf_type; epos = cf.cf_pos; }) in
                  cf.cf_expr <- None;
                  let is_override = List.mem cf.cf_name cl.cl_overrides in
                  
                  if is_override then begin
                    cl.cl_ordered_fields <- List.filter (fun f -> f.cf_name <> cf.cf_name) cl.cl_ordered_fields;
                    cl.cl_fields <- PMap.remove cf.cf_name cl.cl_fields;
                    handle_override_dynfun acc ret var cf.cf_name
                  end else ret :: acc
                | None, _ -> acc)
            | _ -> acc
        ) [] cl.cl_ordered_fields
        in
        (* see if there is any *)
        (match funs with
          | [] -> ()
          | _ ->
            (* if there is, we need to find the constructor *)
            match cl.cl_constructor with
              | None ->
                (* no constructor, create one by replicating the last arguments *)
                let last_ctor = get_last_ctor cl in
                (* if there is no ctor, create a standard one *)
                (match last_ctor with
                  | None ->
                    let ft = TFun([], gen.gcon.basic.tvoid) in
                    let ctor = mk_class_field "new" ft true cl.cl_pos (Method(MethNormal)) [] in
                    let func =
                    {
                      eexpr = TFunction({
                        tf_args = [];
                        tf_type = gen.gcon.basic.tvoid;
                        tf_expr = { eexpr = TBlock(funs); etype = gen.gcon.basic.tvoid; epos = cl.cl_pos };
                      });
                      epos = cl.cl_pos;
                      etype = ft;
                    } in
                    ctor.cf_expr <- Some(func);
                    
                    cl.cl_constructor <- Some(ctor)
                  | Some (ctor) ->
                    let ft = ctor.cf_type in
                    let ctor = mk_class_field "new" ft true cl.cl_pos (Method(MethNormal)) [] in
                    let args, ret = match ft with
                      | TFun (args, ret) -> args, ret
                      | _ -> assert false
                    in
                    let tf_args = List.map (fun (s,_,t) ->
                      let v = alloc_var s t in
                      (v, None)
                    ) args in
                    
                    let block =
                    {
                      eexpr = TCall({ eexpr = TConst(TSuper); etype = TInst(cl, List.map snd cl.cl_types); epos = cl.cl_pos },
                        List.map (fun (v, _) -> {eexpr = TLocal(v); etype = v.v_type; epos = cl.cl_pos;}) tf_args
                      );
                      etype = gen.gcon.basic.tvoid;
                      epos = cl.cl_pos;
                    } :: funs in
                    
                    let func =
                    {
                      eexpr = TFunction({
                        tf_args = tf_args;
                        tf_type = gen.gcon.basic.tvoid;
                        tf_expr = { eexpr = TBlock(block); etype = gen.gcon.basic.tvoid; epos = cl.cl_pos };
                      });
                      epos = cl.cl_pos;
                      etype = ft;
                    } in
                    ctor.cf_expr <- Some(func);
                    
                    cl.cl_constructor <- Some ctor
                )
              | Some ctor ->
                (* FIXME search for super() call here to not interfere with native extension *)
                let func = match ctor.cf_expr with
                  | Some({eexpr = TFunction(tf)} as e) ->
                    
                    let block = match tf.tf_expr.eexpr with
                      | TBlock(bl) -> bl
                      | _ -> [tf.tf_expr]
                    in
                    
                    let found = ref false in
                    let rec add_fn block acc =
                      match block with
                        | ({ eexpr = TCall({ eexpr = TConst(TSuper) }, _) } as hd) :: tl ->
                          found := true;
                          (List.rev acc) @ ((hd :: funs) @ tl)
                        | ({ eexpr = TBlock bl } as hd) :: tl ->
                          add_fn tl ( ({ hd with eexpr = TBlock (add_fn bl []) }) :: acc )
                        | hd :: tl ->
                          add_fn tl ( hd :: acc )
                        | [] -> List.rev acc
                    in
                    
                    let block = add_fn block [] in
                    let block = if !found then
                      block
                    else
                      funs @ block
                    in
                    
                    { e with eexpr = TFunction({
                      tf with tf_expr = {tf.tf_expr with eexpr = TBlock(block)}
                    })}
                  | _ -> assert false
                in
                ctor.cf_expr <- Some(func)
              )
      end
      
    in
    
    let mod_filter = function
      | TClassDecl cl -> (if not cl.cl_extern then handle_class cl); None
      | _ -> None in
    
    gen.gmodule_filters#add ~name:"init_funcs" ~priority:(PCustom priority) mod_filter
  
end;;

(* ******************************************* *)
(* Dynamic Binop/Unop handler *)
(* ******************************************* *)

(*
On some languages there is limited support for operations on
dynamic variables, so those operations must be changed.
There are 5 types of binary operators:
1 - can take any variable and returns a bool (== and !=)
2 - can take either a string, or a number and returns either a bool or the underlying type ( >, < for bool and + for returning its type)
3 - take numbers and return a number ( *, /, ...)
4 - take ints and return an int (bit manipulation)
5 - take a bool and returns a bool ( &&, || ...)
On the default implementation, type 1 and the plus function will be handled with a function call;
Type 2 will be handled with the parameter "compare_handler", which will do something like Reflect.compare(x1, x2);
Types 3, 4 and 5 will perform a cast to double, int and bool, which will then be handled normally by the platform
Unary operators are the most difficult to handle correctly.
With unary operators, there are 2 types:
1 - can take a number, changes and returns the result (++, --, ~)
2 - can take a number (-) or bool (!), and returns the result
The first case is much trickier, because it doesn't seem a good idea to change any variable to double just because it is dynamic,
but this is how we will handle right now.
something like that:
var x:Dynamic = 10;
x++;
will be:
object x = 10;
x = ((IConvertible)x).ToDouble(null) + 1;
depends on:
(syntax) must run before expression/statment normalization because it may generate complex expressions
must run before OverloadingCtor due to later priority conflicts. Since ExpressionUnwrap is only
defined afterwards, we will set this value with absolute values
*)

module DynamicOperators =
struct
  
  let name = "dyn_ops"
  
  let priority = 0.0
  
  let priority_as_synf = 100.0 (*solve_deps name [DBefore ExpressionUnwrap.priority]*)
  
  let abstract_implementation gen ?(handle_strings = true) (should_change:texpr->bool) (equals_handler:texpr->texpr->texpr) (dyn_plus_handler:texpr->texpr->texpr->texpr) (compare_handler:texpr->texpr->texpr) =
  
  
    let get_etype_one e =
      match follow e.etype with
        | TInst({cl_path = ([],"Int")},[]) -> (gen.gcon.basic.tint, { eexpr = TConst(TInt(Int32.one)); etype = gen.gcon.basic.tint; epos = e.epos })
        | _ -> (gen.gcon.basic.tfloat, { eexpr = TConst(TFloat("1.0")); etype = gen.gcon.basic.tfloat; epos = e.epos })
    in
    
    let basic = gen.gcon.basic in
    
    let rec run e =
      match e.eexpr with
        | TBinop (OpAssignOp op, e1, e2) when should_change e -> (* e1 will never contain another TBinop *)
          (match e1.eexpr with
            | TLocal _ ->
              mk_paren { e with eexpr = TBinop(OpAssign, e1, run { e with eexpr = TBinop(op, e1, e2) }) }
            | TField _ | TArray _ ->
              let eleft, rest = match e1.eexpr with
                | TField(ef, f) ->
                  let v = mk_temp gen "dynop" ef.etype in
                  { e1 with eexpr = TField(mk_local v ef.epos, f) }, [ { eexpr = TVars([v,Some (run ef)]); etype = basic.tvoid; epos = ef.epos } ]
                | TArray(e1a, e2a) ->
                  let v = mk_temp gen "dynop" e1a.etype in
                  let v2 = mk_temp gen "dynopi" e2a.etype in
                  { e1 with eexpr = TArray(mk_local v e1a.epos, mk_local v2 e2a.epos) }, [ { eexpr = TVars([v,Some (run e1a); v2, Some (run e2a)]); etype = basic.tvoid; epos = e1.epos } ]
                | _ -> assert false
              in
              { e with
                eexpr = TBlock (rest @ [ { e with eexpr = TBinop(OpAssign, eleft, run { e with eexpr = TBinop(op, eleft, e2) }) } ]);
              }
            | _ ->
              assert false
          )
          
        | TBinop (OpAssign, e1, e2)
        | TBinop (OpInterval, e1, e2) -> Type.map_expr run e
        | TBinop (op, e1, e2) when should_change e->
          (match op with
            | OpEq -> (* type 1 *)
              equals_handler (run e1) (run e2)
            | OpNotEq -> (* != -> !equals() *)
              mk_paren { eexpr = TUnop(Ast.Not, Prefix, (equals_handler (run e1) (run e2))); etype = gen.gcon.basic.tbool; epos = e.epos }
            | OpAdd ->
              if handle_strings && (is_string e.etype or is_string e1.etype or is_string e2.etype) then
                { e with eexpr = TBinop(op, mk_cast gen.gcon.basic.tstring (run e1), mk_cast gen.gcon.basic.tstring (run e2)) }
              else
                dyn_plus_handler e (run e1) (run e2)
            | OpGt | OpGte | OpLt | OpLte -> (* type 2 *)
              { eexpr = TBinop(op, compare_handler (run e1) (run e2), { eexpr = TConst(TInt(Int32.zero)); etype = gen.gcon.basic.tint; epos = e.epos} ); etype = gen.gcon.basic.tbool; epos = e.epos }
            | OpMult | OpDiv | OpSub -> (* always cast everything to double *)
              let etype, _ = get_etype_one e in
              { e with eexpr = TBinop(op, mk_cast etype (run e1), mk_cast etype (run e2)) }
            | OpBoolAnd | OpBoolOr ->
              { e with eexpr = TBinop(op, mk_cast gen.gcon.basic.tbool (run e1), mk_cast gen.gcon.basic.tbool (run e2)) }
            | OpAnd | OpOr | OpXor | OpShl | OpShr | OpUShr | OpMod ->
              { e with eexpr = TBinop(op, mk_cast gen.gcon.basic.tint (run e1), mk_cast gen.gcon.basic.tint (run e2)) }
            | OpAssign | OpAssignOp _ | OpInterval -> assert false)
        | TUnop (Increment as op, flag, e1)
        | TUnop (Decrement as op, flag, e1) when should_change e ->
          (*
some naming definitions:
* ret => the returning variable
* _g => the get body
* getvar => the get variable expr
This will work like this:
- if e1 is a TField, set _g = get body, getvar = (get body).varname
- if Prefix, return getvar = getvar + 1.0
- if Postfix, set ret = getvar; getvar = getvar + 1.0; ret;
*)
          let etype, one = get_etype_one e in
          let op = (match op with Increment -> OpAdd | Decrement -> OpSub | _ -> assert false) in
          
          let tvars, getvar =
            match e1.eexpr with
              | TField(fexpr, field) ->
                let tmp = mk_temp gen "getvar" fexpr.etype in
                let tvars = [tmp, Some(run fexpr)] in
                (tvars, { eexpr = TField( { fexpr with eexpr = TLocal(tmp) }, field); etype = etype; epos = e1.epos })
              | _ ->
                ([], e1)
          in
          
          (match flag with
            | Prefix ->
              let tvars = match tvars with
                | [] -> []
                | _ -> [{ eexpr = TVars(tvars); etype = gen.gcon.basic.tvoid; epos = e.epos }]
              in
              let block = tvars @
              [
                mk_cast etype { e with eexpr = TBinop(OpAssign, getvar,{ eexpr = TBinop(op, mk_cast etype getvar, one); etype = etype; epos = e.epos }); etype = getvar.etype; }
              ] in
              { eexpr = TBlock(block); etype = etype; epos = e.epos }
            | Postfix ->
              let ret = mk_temp gen "ret" etype in
              let tvars = { eexpr = TVars(tvars @ [ret, Some (mk_cast etype getvar)]); etype = gen.gcon.basic.tvoid; epos = e.epos } in
              let retlocal = { eexpr = TLocal(ret); etype = etype; epos = e.epos } in
              let block = tvars ::
              [
                { e with eexpr = TBinop(OpAssign, getvar, { eexpr = TBinop(op, retlocal, one); etype = getvar.etype; epos = e.epos }) };
                retlocal
              ] in
              { eexpr = TBlock(block); etype = etype; epos = e.epos }
          )
        | TUnop (op, flag, e1) when should_change e ->
          let etype = match op with | Not -> gen.gcon.basic.tbool | _ -> gen.gcon.basic.tint in
          mk_paren { eexpr = TUnop(op, flag, mk_cast etype (run e1)); etype = etype; epos = e.epos }
        | _ -> Type.map_expr run e
    in
    run
  
  let configure gen (mapping_func:texpr->texpr) =
    let map e = Some(mapping_func e) in
    gen.gexpr_filters#add ~name:"dyn_ops" ~priority:(PCustom priority) map
   
  let configure_as_synf gen (mapping_func:texpr->texpr) =
    let map e = Some(mapping_func e) in
    gen.gexpr_filters#add ~name:"dyn_ops" ~priority:(PCustom priority_as_synf) map
  
end;;

(* ******************************************* *)
(* Closure Detection *)
(* ******************************************* *)

(*
Just a small utility filter that detects when a closure must be created.
On the default implementation, this means when a function field is being accessed
not via reflection and not to be called instantly
UPDATE: this is no longer needed as TClosure is only used when there is really a delayed closure creation.
*)

module FilterClosures =
struct
  
  let priority = 0.0
  
  let traverse gen (should_change:texpr->string->bool) (filter:texpr->texpr->string->bool->texpr) =
    let rec run e =
      match e.eexpr with
        (*(* this is precisely the only case where we won't even ask if we should change, because it is a direct use of TClosure *)
| TCall ( {eexpr = TClosure(e1,s)} as clos, args ) ->
{ e with eexpr = TCall({ clos with eexpr = TClosure(run e1, s) }, List.map run args ) }
| TCall ( clos, args ) ->
let rec loop clos = match clos.eexpr with
| TClosure(e1,s) -> Some (clos, e1, s)
| TParenthesis p -> loop p
| _ -> None
in
let clos = loop clos in
(match clos with
| Some (clos, e1, s) -> { e with eexpr = TCall({ clos with eexpr = TClosure(run e1, s) }, List.map run args ) }
| None -> Type.map_expr run e)*)
          | TCall(({ eexpr = TField({ eexpr = TTypeExpr _ }, _) } as ef), params)
          | TCall(({ eexpr = TEnumField _ } as ef), params) ->
            { e with eexpr = TCall(ef, List.map run params) }
          | TEnumField(en, f) ->
            (try
              let field = PMap.find f en.e_constrs in
              (* FIXME replace t_dynamic with actual enum Anon field *)
              let changed_expr = { eexpr = TTypeExpr (TEnumDecl en); etype = anon_of_enum en; epos = e.epos } in
              match follow field.ef_type with
                | TFun _ when should_change changed_expr f ->
                  filter e changed_expr f true
                | _ ->
                  e
            with | Not_found -> gen.gcon.error ("Not found enum constructor " ^ f) e.epos; assert false
            )
          | TField(({ eexpr = TTypeExpr _ } as tf), f) ->
            (match field_access gen tf.etype f with
              | FClassField(_,_,cf,_,_) ->
                (match cf.cf_kind with
                  | Method(MethDynamic)
                  | Var _ ->
                    e
                  | _ when should_change tf f ->
                    filter e tf f true
                  | _ ->
                    e
                )
              | _ -> e)
          | TClosure(e1, s) when should_change e1 s ->
            filter e (run e1) s false
          | _ -> Type.map_expr run e
    in
    run
  
  let configure gen (mapping_func:texpr->texpr) =
    let map e = Some(mapping_func e) in
    gen.gexpr_filters#add ~name:"closures_filter" ~priority:(PCustom priority) map
  
end;;

(* ******************************************* *)
(* Dynamic Field Access *)
(* ******************************************* *)

(*
This module will filter every dynamic field access in haxe.
On platforms that do not support dynamic access, it is with this that you should
replace dynamic calls with x.field / Reflect.setField calls, and guess what -
this is the default implemenation!
Actually there is a problem with Reflect.setField because it returns void, which is a bad thing for us,
so even in the default implementation, the function call should be specified to a Reflect.setField version that returns
the value that was set
(TODO: should it be separated?)
As a plus, the default implementation adds something that doesn't hurt anybody, it looks for
TAnon with Statics / EnumStatics field accesses and transforms them into real static calls.
This means it will take this
var m = Math;
for (i in 0...1000) m.cos(10);
which is an optimization in dynamic platforms, but performs horribly on strongly typed platforms
and transform into:
var m = Math;
for (i in 0...1000) Math.cos(10);
(addendum:)
configure_generate_classes will already take care of generating the reflection-enabled class fields and calling abstract_implementation
with the right arguments.
Also
depends on:
(ok) must run AFTER Binop/Unop handler - so Unops / Binops are already unrolled
*)

module DynamicFieldAccess =
struct
  
  let name = "dynamic_field_access"
  
  let priority = solve_deps name [DAfter DynamicOperators.priority]
  
  let priority_as_synf = solve_deps name [DAfter DynamicOperators.priority_as_synf]
  
  (*
is_dynamic (expr) (field_access_expr) (field) : a function that indicates if the field access should be changed
change_expr (expr) (field_access_expr) (field) (setting expr) (is_unsafe) : changes the expression
call_expr (expr) (field_access_expr) (field) (call_params) : changes a call expression
*)
  let abstract_implementation gen (is_dynamic:texpr->texpr->string->bool) (change_expr:texpr->texpr->string->texpr option->bool->texpr) (call_expr:texpr->texpr->string->texpr list->texpr) =
    let rec run e =
      match e.eexpr with
        (* class types *)
        | TField(fexpr, field)
        | TClosure(fexpr, field) when is_dynamic e fexpr field ->
          change_expr e (run fexpr) field None true
        | TCall(
            { eexpr = TField( { eexpr = TTypeExpr ( TClassDecl ({ cl_path = ([], "Reflect") }) ) }, "field") },
            [obj; { eexpr = TConst(TString(field)) }]
          ) ->
          change_expr { e with eexpr = TField(obj, field) } (run obj) field None false
        | TCall(
            { eexpr = TField( { eexpr = TTypeExpr ( TClassDecl ({ cl_path = ([], "Reflect") }) ) }, "setField") },
            [obj; { eexpr = TConst(TString(field)) }; evalue]
          ) ->
          change_expr { e with eexpr = TField(obj, field) } (run obj) field (Some (run evalue)) false
        | TBinop(OpAssign, ({eexpr = TField(fexpr, field)}), evalue) when is_dynamic e fexpr field ->
          change_expr e (run fexpr) field (Some (run evalue)) true
        | TField(fexpr, field) when is_some (anon_class fexpr.etype) ->
          let decl = get (anon_class fexpr.etype) in
          { e with eexpr = TField({ fexpr with eexpr = (TTypeExpr decl) }, field) }
        | TClosure(fexpr, field) when is_some (anon_class fexpr.etype) ->
          let decl = get (anon_class fexpr.etype) in
          { e with eexpr = TClosure({ fexpr with eexpr = (TTypeExpr decl) }, field) }
(* #if debug *)
        | TBinop(OpAssignOp op, ({eexpr = TField(fexpr, field)}), evalue) when is_dynamic e fexpr field -> assert false (* this case shouldn't happen *)
        | TUnop(Increment, _, ({eexpr = TField( ( { eexpr=TLocal(local) } as fexpr ), field)}))
        | TUnop(Decrement, _, ({eexpr = TField( ( { eexpr=TLocal(local) } as fexpr ), field)})) when is_dynamic e fexpr field -> assert false (* this case shouldn't happen *)
(* #end *)
        | TCall( ({ eexpr = TField(fexpr, field) } as expr), params ) when is_dynamic expr fexpr field ->
          call_expr e (run fexpr) field (List.map run params)
        | _ -> Type.map_expr run e
    in run
  
  (*
this function will already configure with the abstract implementation, and also will create the needed class fields to
enable reflection on platforms that don't support reflection.
this means it will create the following class methods:
- getField(field, isStatic) - gets the value of the field. isStatic
- setField -
-
*)
  let configure_generate_classes gen optimize (runtime_getset_field:texpr->texpr->string->texpr option->texpr) (runtime_call_expr:texpr->texpr->string->texpr list->texpr) =
    ()
  
  let configure gen (mapping_func:texpr->texpr) =
    let map e = Some(mapping_func e) in
    gen.gexpr_filters#add ~name:"dynamic_field_access" ~priority:(PCustom(priority)) map
  
  let configure_as_synf gen (mapping_func:texpr->texpr) =
    let map e = Some(mapping_func e) in
    gen.gexpr_filters#add ~name:"dynamic_field_access" ~priority:(PCustom(priority_as_synf)) map
  
end;;

(* ******************************************* *)
(* Dynamic TArray Handling *)
(* ******************************************* *)

(*
In some languages you cannot overload the [] operator,
so we need to decide what is kept as TArray and what gets mapped.
- in order to do this you must ensure that
depends on:
(syntax) must run before expression/statment normalization because it may generate complex expressions
(ok) must run before binop transformations because it may generate some untreated binop ops
(ok) must run before dynamic field access is transformed into reflection
*)

module TArrayTransform =
struct
  
  let name = "dyn_tarray"
  
  let priority = solve_deps name [DBefore DynamicOperators.priority; DBefore DynamicFieldAccess.priority]
  
  let priority_as_synf = solve_deps name [DBefore DynamicOperators.priority_as_synf; DBefore DynamicFieldAccess.priority_as_synf]
  
  let default_implementation gen (should_change:texpr->bool) (get_fun:string) (set_fun:string) =
    let basic = gen.gcon.basic in
    let mk_get e e1 e2 =
      { e with eexpr = TCall({ eexpr = TField(e1, get_fun); etype = TFun([("i",false,gen.gcon.basic.tint)], e.etype); epos = e1.epos}, [e2]) }
    in
    let mk_set e e1 e2 evalue =
      { e with eexpr = TCall({ eexpr = TField(e1, set_fun); etype = TFun([("i",false,gen.gcon.basic.tint);("val",false,evalue.etype)], evalue.etype); epos = e1.epos}, [e2; evalue]) }
    in
    let rec run e =
      match e.eexpr with
        | TArray(e1, e2) ->
          (* e1 should always be a var; no need to map there *)
          if should_change e then mk_get e (run e1) (run e2) else Type.map_expr run e
        | TBinop (Ast.OpAssign, ({ eexpr = TArray(e1a,e2a) } as earray), evalue) when should_change earray ->
          mk_set e (run e1a) (run e2a) (run evalue)
        | TBinop (Ast.OpAssignOp op,({ eexpr = TArray(e1a,e2a) } as earray) , evalue) when should_change earray ->
          (* cache all arguments in vars so they don't get executed twice *)
          (* let ensure_local gen block name e = *)
          let block = ref [] in
          
          let arr_local = ensure_local gen block "array" (run e1a) in
          let idx_local = ensure_local gen block "index" (run e2a) in
          block := (mk_set e arr_local idx_local ( { e with eexpr=TBinop(op, mk_get earray arr_local idx_local, run evalue) } )) :: !block;
          
          { e with eexpr = TBlock (List.rev !block) }
        | TUnop(op, flag, ({ eexpr = TArray(e1a, e2a) } as earray)) ->
          if should_change earray && match op with | Not | Neg -> false | _ -> true then begin
            
            let block = ref [] in
            
            let actual_t = match op with
              | Ast.Increment | Ast.Decrement -> (match follow earray.etype with
                | TInst _ | TEnum _ -> earray.etype
                | _ -> basic.tfloat)
              | Ast.Not -> basic.tbool
              | _ -> basic.tint
            in
            
            let val_v = mk_temp gen "arrVal" actual_t in
            let ret_v = mk_temp gen "arrRet" actual_t in
            
            let arr_local = ensure_local gen block "arr" (run e1a) in
            let idx_local = ensure_local gen block "arrIndex" (run e2a) in
            
            let val_local = { earray with eexpr = TLocal(val_v) } in
            let ret_local = { earray with eexpr = TLocal(ret_v) } in
            (* var idx = 1; var val = x._get(idx); var ret = val++; x._set(idx, val); ret; *)
            block := { eexpr = TVars(
                [
                  val_v, Some(mk_get earray arr_local idx_local); (* var val = x._get(idx) *)
                  ret_v, Some { e with eexpr = TUnop(op, flag, val_local) } (* var ret = val++ *)
                ]);
                etype = gen.gcon.basic.tvoid;
                epos = e2a.epos
              } :: !block;
            block := (mk_set e arr_local idx_local val_local) (*x._set(idx,val)*) :: !block;
            block := ret_local :: !block;
            { e with eexpr = TBlock (List.rev !block) }
          end else
            Type.map_expr run e
        | _ -> Type.map_expr run e
        
    in run
  
  let configure gen (mapping_func:texpr->texpr) =
    let map e = Some(mapping_func e) in
    gen.gexpr_filters#add ~name:"dyn_tarray" ~priority:(PCustom priority) map
      
  let configure_as_synf gen (mapping_func:texpr->texpr) =
    let map e = Some(mapping_func e) in
    gen.gexpr_filters#add ~name:"dyn_tarray" ~priority:(PCustom priority_as_synf) map
    
end;;

(* ******************************************* *)
(* Try / Catch + throw native types handling *)
(* ******************************************* *)

(*
Some languages/vm's do not support throwing any kind of value. For them, only
special kinds of objects can be thrown. Because of this, we must wrap some throw
statements with an expression, and also we must unwrap it on the catch() phase, and
maybe manually test with Std.is()
dependencies:
must run before dynamic field access (?) TODO review
It's a syntax filter, as it alters types (throw wrapper)
*)

module TryCatchWrapper =
struct

  let priority = solve_deps "try_catch" [DBefore DynamicFieldAccess.priority]
  
  (*
should_wrap : does the type should be wrapped? This of course works on the reverse way, so it tells us if the type should be unwrapped as well
wrap_throw : the wrapper for throw (throw expr->expr inside throw->returning wrapped expression)
unwrap_expr : the other way around : given the catch var (maybe will need casting to wrapper_type) , return the unwrap expr
rethrow_expr : how to rethrow ane exception in the platform
catchall_type : the class used for catchall (e:Dynamic)
wrapper_type : the wrapper type, so we can test if exception is of type 'wrapper'
catch_map : maps the catch expression to include some intialization code (e.g. setting up Stack.exceptionStack)
*)
  let traverse gen (should_wrap:t->bool) (wrap_throw:texpr->texpr->texpr) (unwrap_expr:tvar->pos->texpr) (rethrow_expr:texpr->texpr) (catchall_type:t) (wrapper_type:t) (catch_map:tvar->texpr->texpr) =
    let rec run e =
      match e.eexpr with
          | TThrow texpr when should_wrap texpr.etype -> wrap_throw e (run texpr)
          | TTry (ttry, catches) ->
            let nowrap_catches, must_wrap_catches, catchall = List.fold_left (fun (nowrap_catches, must_wrap_catches, catchall) (v, catch) ->
              (* first we'll see if the type is Dynamic (catchall) *)
              match follow v.v_type with
                | TDynamic _ ->
                  assert (is_none catchall);
                  (nowrap_catches, must_wrap_catches, Some(v,catch_map v (run catch)))
                (* see if we should unwrap it *)
                | _ when should_wrap (follow v.v_type) ->
                  (nowrap_catches, (v,catch_map v (run catch)) :: must_wrap_catches, catchall)
                | _ ->
                  ( (v,catch_map v (run catch)) :: nowrap_catches, must_wrap_catches, catchall )
            ) ([], [], None) catches
            in
            (*
1st catch all nowrap "the easy way"
2nd see if there are any must_wrap or catchall. If there is,
do a catchall first with a temp var.
then get catchall var (as dynamic) (or create one), and declare it = catchall exception
then test if it is of type wrapper_type. If it is, unwrap it
then start doing Std.is() tests for each catch type
if there is a catchall in the end, end with it. If there isn't, rethrow
*)
            let dyn_catch = match (catchall, must_wrap_catches) with
              | Some (v,c), _
              | _, (v, c) :: _ ->
                let pos = c.epos in
                let temp_var = mk_temp gen "catchallException" catchall_type in
                let temp_local = { eexpr=TLocal(temp_var); etype = temp_var.v_type; epos = pos } in
                let catchall_var = (*match catchall with
| None -> *) mk_temp gen "catchall" t_dynamic
                  (*| Some (v,_) -> v*)
                in
                let catchall_decl = { eexpr = TVars([catchall_var, Some(temp_local)]); etype=gen.gcon.basic.tvoid; epos = pos } in
                let catchall_local = { eexpr = TLocal(catchall_var); etype = t_dynamic; epos = pos } in
                (* if it is of type wrapper_type, unwrap it *)
                let std_is = mk_static_field_access (get_cl (get_type gen ([],"Std"))) "is" (TFun(["v",false,t_dynamic;"cl",false,mt_to_t (get_type gen ([], "Class")) [t_dynamic]],gen.gcon.basic.tbool)) pos in
                let mk_std_is t pos = { eexpr = TCall(std_is, [catchall_local; mk_mt_access (t_to_mt t) pos]); etype = gen.gcon.basic.tbool; epos = pos } in
                
                let if_is_wrapper_expr = { eexpr = TIf(mk_std_is wrapper_type pos,
                  { eexpr = TBinop(OpAssign, catchall_local, unwrap_expr temp_var pos); etype = t_dynamic; epos = pos }
                , None); etype = gen.gcon.basic.tvoid; epos = pos } in
                let rec loop must_wrap_catches = match must_wrap_catches with
                  | (vcatch,catch) :: tl ->
                    { eexpr = TIf(mk_std_is vcatch.v_type catch.epos,
                      { eexpr = TBlock({ eexpr=TVars([vcatch, Some(mk_cast vcatch.v_type catchall_local)]); etype=gen.gcon.basic.tvoid; epos=catch.epos } :: [catch] ); etype = gen.gcon.basic.tvoid; epos = catch.epos },
                      Some (loop tl));
                    etype = gen.gcon.basic.tvoid; epos = catch.epos }
                  | [] ->
                    match catchall with
                      | Some (v,s) ->
                        Codegen.concat { eexpr = TVars([v, Some(catchall_local)]); etype = gen.gcon.basic.tvoid; epos = pos } s
                      | None ->
                        mk_block (rethrow_expr temp_local)
                in
                [ ( temp_var, { e with eexpr = TBlock([ catchall_decl; if_is_wrapper_expr; loop must_wrap_catches ]) } ) ]
              | _ ->
                []
            in
            { e with eexpr = TTry(run ttry, (List.rev nowrap_catches) @ dyn_catch) }
          | _ -> Type.map_expr run e
    in
    run
  
  let configure gen (mapping_func:texpr->texpr) =
    let map e = Some(mapping_func e) in
    gen.gsyntax_filters#add ~name:"try_catch" ~priority:(PCustom priority) map
  
end;;

let fun_args = List.map (function | (v,s) -> (v.v_name, (match s with | None -> false | Some _ -> true), v.v_type))

(* ******************************************* *)
(* Closures To Class *)
(* ******************************************* *)

(*
This is a very important filter. It will take all anonymous functions from the AST, will search for all captured variables, and will create a class
that implements an abstract interface for calling functions. This is very important for targets that don't support anonymous functions to work correctly.
Also it is possible to implement some strategies to avoid value type boxing, such as NaN tagging or double/object arguments. All this will be abstracted away
from this interface.
dependencies:
must run after dynamic field access, because of conflicting ways to deal with invokeField
(module filter) must run after OverloadingCtor so we can also change the dynamic function expressions
uses TArray expressions for array. TODO see interaction
uses TThrow expressions.
*)

module ClosuresToClass =
struct
  
  let name = "closures_to_class"
  
  let priority = solve_deps name [ DAfter DynamicFieldAccess.priority ]
  
  let priority_as_synf = solve_deps name [ DAfter DynamicFieldAccess.priority_as_synf ]
  
  type closures_ctx =
  {
    fgen : generator_ctx;
    
    mutable func_class : tclass;
    
    (*
this is what will actually turn the function into class field.
The standard implementation by default will already take care of creating the class, and setting the captured variables.
It will also return the super arguments to be called
*)
    mutable closure_to_classfield : tfunc->t->pos->tclass_field * (texpr list);
    
    (*
when a dynamic function call is made, we need to convert it as if it were calling the dynamic function interface.
TCall expr -> new TCall expr
*)
    mutable dynamic_fun_call : texpr->texpr;
    
    (*
called once so the implementation can make one of a time initializations in the base class
for all functions
*)
    mutable initialize_base_class : tclass->unit;
    
    (*
Base classfields are the class fields for the abstract implementation of either the Function implementation,
or the invokeField implementation for the classes
They will either try to call the right function or will fail with
(tclass - subject (so we know the type of this)) -> is_function_base -> additional arguments for each function (at the beginning) -> list of the abstract implementation class fields
*)
    mutable get_base_classfields_for : tclass->bool->(unit->(tvar * tconstant option) list)->tclass_field list;
    
    (*
This is a more complex version of get_base_classfields_for.
It's meant to provide a toolchain so we can easily create classes that extend Function
and add more functionality on top of it.
arguments:
tclass -> subject (so we know the type of this)
bool -> is it a function type
( int -> (int->t->tconstant option->texpr) -> ( (tvar * tconstant option) list * texpr) )
int -> current arity of the function whose member will be mapped; -1 for dynamic function. It is guaranteed that dynamic function will be called last
t -> the return type of the function
(int->t->tconstant option->texpr) -> api to get exprs that unwrap arguments correctly
int -> argument wanted to unwrap
t -> solicited type
tconstant option -> map to this default value if null
returns a texpr that tells how the default
should return a list with additional arguments (only works if is_function_base = true)
and the underlying function expression
*)
    mutable map_base_classfields : tclass->bool->( int -> t -> (tvar list) -> (int->t->tconstant option->texpr) -> ( (tvar * tconstant option) list * texpr) )->tclass_field list;
    
    mutable transform_closure : texpr->texpr->string->texpr;
    
  }
  
  (*
the default implementation will take 3 transformation functions:
* one that will transform closures that are not called immediately (instance.myFunc).
normally on this case it's best to have a runtime handler that will take the instance, the function and call its invokeField when invoked
* one that will actually handle the anonymous functions themselves.
* one that will transform calling a dynamic function. So for example, dynFunc(arg1, arg2) might turn into dynFunc.apply2(arg1, arg2);
( suspended ) * an option to match papplied functions
*)
  
  let traverse gen (transform_closure:texpr->texpr->string->texpr) (handle_anon_func:texpr->tfunc->texpr) (dynamic_func_call:texpr->texpr) e =
    let rec run e =
      match e.eexpr with
        | TCall( { eexpr = TEnumField _ }, _ ) ->
          Type.map_expr run e
        (* if a TClosure is being call immediately, there's no need to convert it to a TClosure *)
        | TCall(( { eexpr = TField(ecl,f) } as e1), params) ->
          (* check to see if called field is known and if it is a MethNormal (only MethNormal fields can be called directly) *)
          (match field_access gen (gen.greal_type ecl.etype) f with
            | FClassField(_,_,cf,_,_) ->
              (match cf.cf_kind with
                | Method MethNormal
                | Method MethInline ->
                  { e with eexpr = TCall({ e1 with eexpr = TField(run ecl, f) }, List.map run params) }
                | _ ->
                  match gen.gfollow#run_f e1.etype with
                    | TFun _ ->
                      dynamic_func_call { e with eexpr = TCall(run e1, List.map run params) }
                    | _ ->
                      let i = ref 0 in
                      let t = TFun(List.map (fun e -> incr i; "arg" ^ (string_of_int !i), false, e.etype) params, e.etype) in
                      dynamic_func_call { e with eexpr = TCall( mk_cast t (run e1), List.map run params ) }
              )
            (* | FNotFound ->
{ e with eexpr = TCall({ e1 with eexpr = TField(run ecl, f) }, List.map run