js_block_runtime.ml

(* Copyright (C) 2019- Authors of BuckleScript
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * In addition to the permissions granted to you by the LGPL, you may combine
 * or link a "work that uses the Library" with a publicly distributed version
 * of this file to produce a combined library or application, then distribute
 * that combined work under the terms of your choosing, with no requirement
 * to comply with the obligations normally placed on you by section 4 of the
 * LGPL version 3 (or the corresponding section of a later version of the LGPL
 * should you choose to use a 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser 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. *)


let tag_is_zero (tag : J.expression) = 
  match tag.expression_desc with 
  | Number (Int {i = 0l; _}) -> true 
  | _ -> false;;

 let needChromeRuntime 
  (tag : J.expression)
  (tag_info : J.tag_info) = 
  match tag_info with 
  | Blk_poly_var _     
  | Blk_constructor _   -> true
  | Blk_record_inlined _ -> true  
  | Blk_record _   
  | Blk_module_export
  | Blk_module _ -> false
  | Blk_tuple 
  | Blk_extension
  | Blk_class
  | Blk_array   
  | Blk_record_ext _ -> false
  | Blk_extension_slot -> false 
  | Blk_na _ ->  not (tag_is_zero tag )

let needBlockRuntime (tag : J.expression) (tag_info : J.tag_info) = 
  match  tag_info with 
  | Blk_poly_var _ 
  | Blk_module _
  | Blk_module_export
  | Blk_record _  
  | Blk_tuple 
  | Blk_extension
  | Blk_class
  | Blk_array -> false   
  | Blk_record_inlined (_,_,1)  
  | Blk_constructor (_, 1)      
  | Blk_na _ -> not (tag_is_zero tag)
  | Blk_record_inlined _ 
  | Blk_constructor _   -> true  
  | Blk_record_ext _ 
  | Blk_extension_slot -> false 
    (* converted to [Pcreate_extension] in the beginning*)

let option_id =   
  Ident.create_persistent Js_runtime_modules.option
let curry_id =   
  Ident.create_persistent Js_runtime_modules.curry
let block_id = 
  Ident.create_persistent Js_runtime_modules.block
let caml_chrome_id = 
  Ident.create_persistent Js_runtime_modules.caml_chrome_block

let check_additional_id (x : J.expression) =
  match x.expression_desc with
  | Optional_block(_,false) -> 
    Some option_id  
  | Call(_, _, {arity = NA}) ->  
    Some curry_id
  | Caml_block(_,_,tag,tag_info) 
    -> 
    if not !Js_config.debug then
      if needBlockRuntime tag tag_info then 
        Some block_id
      else None   
    else
    if needChromeRuntime tag tag_info then 
      (* This may depends on two modules, so in the runtime
        we let chrome depends on block
      *)
      Some caml_chrome_id
    else None
  | _ -> 
    None