[refact] use array representaion per discussion of rescript-lang#24 (rescript-lang#287)

Author: bobzhang

jscomp/js_config.ml

@@ -145,8 +145,11 @@ let weak = "Caml_weak"
 let backtrace = "Caml_backtrace"
 let gc = "Caml_gc"
 let int32 = "Caml_int32"
+let block = "Block"
+
 let runtime_set = 
   [
+    block;
     int32;
     gc ;
     backtrace; 

jscomp/js_config.mli

@@ -34,6 +34,7 @@ val default_gen_tds : bool ref
 val runtime_set : String_set.t
 val stdlib_set : String_set.t
 
+val block : string
 val int32 : string
 val gc : string 
 val backtrace : string

jscomp/js_dump.ml

@@ -110,6 +110,8 @@ module L = struct
   let ge = ">="
   let plus_plus = "++" (* FIXME: use (i = i + 1 | 0) instead *)
   let minus_minus = "--"
+  let caml_block = "Block"
+  let caml_block_create = "__"
 end
 let return_indent = (String.length L.return / Ext_pp.indent_length) 
 
@@ -892,28 +894,19 @@ and
 
     | Number (Int { i = 0l ; _})  , 
       (Blk_tuple | Blk_array | Blk_variant _ | Blk_record _ | Blk_na | Blk_module _
-      |  Blk_constructor (_, 1)
+      |  Blk_constructor (_, 1) (* Sync up with {!Js_dump}*)
       ) 
-      (* Hack to optimize option which is really pervasive in ocaml, 
-         we need concrete benchmark to support this
-      *) 
       -> expression_desc cxt l f  (Array (el, mutable_flag))
     (* TODO: for numbers like 248, 255 we can reverse engineer to make it 
        [Obj.xx_flag], but we can not do this in runtime libraries
     *)
 
     | _, _
       -> 
-      expression_desc cxt l f 
-        (J.Object (
-            let length, rev_list = 
-              List.fold_left (fun (i,acc) v -> 
-                (i+1, (Js_op.Int_key i, v) :: acc)                
-              ) (0, []) el in
-            List.rev_append rev_list 
-              [(Js_op.Length, E.small_int length) ;  (Js_op.Tag, tag)]
-          )
-        )
+      P.string f L.caml_block; 
+      P.string f L.dot ;
+      P.string f L.caml_block_create;
+      P.paren_group f 1 (fun _ -> arguments cxt f [tag; E.arr mutable_flag el])
     end
   | Caml_block_tag e ->
     P.group f 1 (fun _ ->  

jscomp/js_fold_basic.ml

@@ -58,11 +58,24 @@ class count_hard_dependencies =
       match  x with
       | {expression_desc = Call (_,_, {arity = NA}); _}
         (* see [Js_exp_make.runtime_var_dot] *)
-        -> begin 
+        -> 
+        Hash_set.add hard_dependencies 
+          (Lam_module_ident.of_runtime (Ext_ident.create_js Js_config.curry));
+        super#expression x             
+      | {expression_desc = Caml_block(_,_, tag, tag_info); _}
+        -> 
+        begin match tag.expression_desc, tag_info with 
+          | Number (Int { i = 0l ; _})  , 
+            (Blk_tuple | Blk_array | Blk_variant _ | Blk_record _ | Blk_na | Blk_module _
+            |  Blk_constructor (_, 1)
+            )  (*Sync up with {!Js_dump}*)
+            -> ()
+          | _, _
+            -> 
             Hash_set.add hard_dependencies 
-              (Lam_module_ident.of_runtime (Ext_ident.create_js Js_config.curry));
-            super#expression x             
-          end
+              (Lam_module_ident.of_runtime (Ext_ident.create_js Js_config.block));
+        end;
+        super#expression x 
       | _ -> super#expression x
     method get_hard_dependencies = hard_dependencies
   end

jscomp/runtime/.depend

@@ -1,7 +1,7 @@
+block.cmi :
 caml_array.cmi :
 caml_backtrace.cmi :
 caml_bigarray.cmi :
-caml_block.cmi :
 caml_builtin_exceptions.cmi :
 caml_exceptions.cmi : caml_builtin_exceptions.cmi
 caml_float.cmi :
@@ -21,14 +21,14 @@ caml_string.cmi :
 caml_sys.cmi :
 caml_utils.cmi :
 caml_weak.cmi :
+block.cmo : block.cmi
+block.cmx : block.cmi
 caml_array.cmo : js.cmo caml_array.cmi
 caml_array.cmx : js.cmx caml_array.cmi
 caml_backtrace.cmo : caml_backtrace.cmi
 caml_backtrace.cmx : caml_backtrace.cmi
 caml_bigarray.cmo : caml_bigarray.cmi
 caml_bigarray.cmx : caml_bigarray.cmi
-caml_block.cmo : caml_block.cmi
-caml_block.cmx : caml_block.cmi
 caml_builtin_exceptions.cmo : caml_builtin_exceptions.cmi
 caml_builtin_exceptions.cmx : caml_builtin_exceptions.cmi
 caml_exceptions.cmo : caml_builtin_exceptions.cmi caml_exceptions.cmi
@@ -79,14 +79,14 @@ js_error.cmo :
 js_error.cmx :
 typed_array.cmo :
 typed_array.cmx :
+block.cmo : block.cmi
+block.cmj : block.cmi
 caml_array.cmo : js.cmo caml_array.cmi
 caml_array.cmj : js.cmj caml_array.cmi
 caml_backtrace.cmo : caml_backtrace.cmi
 caml_backtrace.cmj : caml_backtrace.cmi
 caml_bigarray.cmo : caml_bigarray.cmi
 caml_bigarray.cmj : caml_bigarray.cmi
-caml_block.cmo : caml_block.cmi
-caml_block.cmj : caml_block.cmi
 caml_builtin_exceptions.cmo : caml_builtin_exceptions.cmi
 caml_builtin_exceptions.cmj : caml_builtin_exceptions.cmi
 caml_exceptions.cmo : caml_builtin_exceptions.cmi caml_exceptions.cmi

jscomp/runtime/block.js

@@ -0,0 +1,11 @@
+// Generated CODE, PLEASE EDIT WITH CARE
+'use strict';
+
+
+function __(tag, block) {
+  block.tag = tag;
+  return block;
+}
+
+exports.__ = __;
+/* No side effect */

jscomp/runtime/caml_block.ml jscomp/runtime/block.ml

@@ -20,5 +20,5 @@
 
 (* Note that when we introduce it in {!Js_dump} 
    we need introduce dependency properly *)
-let create tag block = 
+let __ tag block = 
   Obj.set_tag block tag; block

jscomp/runtime/caml_block.mli jscomp/runtime/block.mli

@@ -18,4 +18,5 @@
 
 (* Author: Hongbo Zhang *)
 
-val create : int -> Obj.t -> Obj.t
+
+val __ : int -> Obj.t -> Obj.t

jscomp/runtime/caml_obj.js

@@ -2,6 +2,7 @@
 'use strict';
 
 var Caml_builtin_exceptions = require("./caml_builtin_exceptions");
+var Block                   = require("./block");
 
 function caml_obj_dup(x) {
   var len = x.length;
@@ -36,11 +37,7 @@ function caml_obj_truncate(x, new_size) {
 }
 
 function caml_lazy_make_forward(x) {
-  return {
-          0: x,
-          length: 1,
-          tag: 250
-        };
+  return Block.__(250, [x]);
 }
 
 function caml_update_dummy(x, y) {

jscomp/runtime/runtime.mllib

@@ -10,7 +10,7 @@ caml_utils
 caml_sys
 caml_io
 caml_float
-caml_block
+
 caml_lexer
 caml_parser
 caml_primitive
@@ -29,3 +29,4 @@ fn
 js_error
 caml_curry
 curry
+block