delay the external module dependency check, so we can decide whehter …

jscomp/j.ml

@@ -341,9 +341,15 @@ and block =  statement list
 
 and program = {
   name :  string;
-  modules : required_modules ;
+
   block : block ;
   exports : exports ;
   export_set : Ident_set.t ;
-  side_effect : string option (* None: no, Some reason  *)
+
 }
+and deps_program = 
+  {
+    program : program ; 
+    modules : required_modules ;
+    side_effect : string option (* None: no, Some reason  *)
+  }

jscomp/js_dump.ml

@@ -1300,7 +1300,7 @@ let exports cxt f (idents : Ident.t list) =
   outer_cxt  
 
 
-let node_program f ( program : J.program) = 
+let node_program f ( {program ; modules ; } : J.deps_program) = 
   let cxt = Ext_pp_scope.empty in
   (* Node style *)
   let requires cxt f (modules : (Ident.t * string) list ) =
@@ -1330,7 +1330,7 @@ let node_program f ( program : J.program) =
     outer_cxt
   in
 
-  let cxt = requires cxt  f program.modules in
+  let cxt = requires cxt  f modules in
 
   let () = P.force_newline f in
   let cxt =  statement_list true cxt f program.block  in
@@ -1339,7 +1339,7 @@ let node_program f ( program : J.program) =
 
 
 let amd_program f 
-    ({modules; block = b ; exports = exp ; side_effect  } as program : J.program)
+    ( {program ; modules ; _} : J.deps_program)
   = 
   P.newline f ; 
   let cxt = Ext_pp_scope.empty in
@@ -1371,15 +1371,15 @@ let amd_program f
   P.brace_vgroup f 1 @@ (fun _ -> 
       let () = P.string f L.strict_directive in 
       let () = P.newline f in
-      let cxt =  statement_list true cxt f  b in 
+      let cxt =  statement_list true cxt f  program.block in 
       (* FIXME AMD : use {[ function xx ]} or {[ var x = function ..]} *)
       P.newline f;
       P.force_newline f;
       ignore (exports cxt f program.exports));
   P.string f ")";
 ;;
 
-let pp_program (program : J.program) (f : Ext_pp.t) = 
+let pp_program ( program  : J.deps_program) (f : Ext_pp.t) = 
   begin
     P.string f "// Generated CODE, PLEASE EDIT WITH CARE";
     P.newline f; 
@@ -1404,6 +1404,6 @@ let pp_program (program : J.program) (f : Ext_pp.t) =
     P.flush f ()
   end
 let dump_program 
-    (program : J.program)
+    (program : J.deps_program)
     (oc : out_channel) = 
   pp_program program (P.from_channel oc)

jscomp/js_dump.mli

@@ -25,6 +25,6 @@
 (** Print JS IR to vanilla Javascript code *)
 
 
-val pp_program : J.program -> Ext_pp.t -> unit
+val pp_program : J.deps_program -> Ext_pp.t -> unit
 
-val dump_program : J.program -> out_channel -> unit
+val dump_program : J.deps_program -> out_channel -> unit

jscomp/js_fold.ml

@@ -301,21 +301,11 @@ class virtual fold =
            let o = o#property_name _x in let o = o#expression _x_i1 in o)
     method property : property -> 'self_type = o#unknown
     method program : program -> 'self_type =
-      fun
-        {
-          name = _x;
-          modules = _x_i1;
-          block = _x_i2;
-          exports = _x_i3;
-          export_set = _x_i4;
-          side_effect = _x_i5
-        } ->
+      fun { name = _x; block = _x_i1; exports = _x_i2; export_set = _x_i3 }
+        ->
         let o = o#string _x in
-        let o = o#required_modules _x_i1 in
-        let o = o#block _x_i2 in
-        let o = o#exports _x_i3 in
-        let o = o#unknown _x_i4 in
-        let o = o#option (fun o -> o#string) _x_i5 in o
+        let o = o#block _x_i1 in
+        let o = o#exports _x_i2 in let o = o#unknown _x_i3 in o
     method number : number -> 'self_type = o#unknown
     method mutable_flag : mutable_flag -> 'self_type = o#unknown
     method label : label -> 'self_type = o#string
@@ -397,6 +387,11 @@ class virtual fold =
         let o = o#option (fun o -> o#string) _x_i1 in o
     method exports : exports -> 'self_type = o#unknown
     method exception_ident : exception_ident -> 'self_type = o#ident
+    method deps_program : deps_program -> 'self_type =
+      fun { program = _x; modules = _x_i1; side_effect = _x_i2 } ->
+        let o = o#program _x in
+        let o = o#required_modules _x_i1 in
+        let o = o#option (fun o -> o#string) _x_i2 in o
     method case_clause :
       (* since in ocaml, it's expression oriented langauge, [return] in
     general has no jumps, it only happens when we do 

jscomp/js_map.ml

@@ -322,30 +322,13 @@ class virtual map =
            let _x_i1 = o#expression _x_i1 in (_x, _x_i1))
     method property : property -> property = o#unknown
     method program : program -> program =
-      fun
-        {
-          name = _x;
-          modules = _x_i1;
-          block = _x_i2;
-          exports = _x_i3;
-          export_set = _x_i4;
-          side_effect = _x_i5
-        } ->
+      fun { name = _x; block = _x_i1; exports = _x_i2; export_set = _x_i3 }
+        ->
         let _x = o#string _x in
-        let _x_i1 = o#required_modules _x_i1 in
-        let _x_i2 = o#block _x_i2 in
-        let _x_i3 = o#exports _x_i3 in
-        let _x_i4 = o#unknown _x_i4 in
-        let _x_i5 = o#option (fun o -> o#string) _x_i5
-        in
-          {
-            name = _x;
-            modules = _x_i1;
-            block = _x_i2;
-            exports = _x_i3;
-            export_set = _x_i4;
-            side_effect = _x_i5;
-          }
+        let _x_i1 = o#block _x_i1 in
+        let _x_i2 = o#exports _x_i2 in
+        let _x_i3 = o#unknown _x_i3
+        in { name = _x; block = _x_i1; exports = _x_i2; export_set = _x_i3; }
     method number : number -> number = o#unknown
     method mutable_flag : mutable_flag -> mutable_flag = o#unknown
     method label : label -> label = o#string
@@ -444,6 +427,12 @@ class virtual map =
         in { expression_desc = _x; comment = _x_i1; }
     method exports : exports -> exports = o#unknown
     method exception_ident : exception_ident -> exception_ident = o#ident
+    method deps_program : deps_program -> deps_program =
+      fun { program = _x; modules = _x_i1; side_effect = _x_i2 } ->
+        let _x = o#program _x in
+        let _x_i1 = o#required_modules _x_i1 in
+        let _x_i2 = o#option (fun o -> o#string) _x_i2
+        in { program = _x; modules = _x_i1; side_effect = _x_i2; }
     method case_clause :
       (* since in ocaml, it's expression oriented langauge, [return] in
     general has no jumps, it only happens when we do 

jscomp/js_program_loader.ml

@@ -95,17 +95,17 @@ let string_of_module_id (x : module_id) : string =
    FIXME: the module order matters?
 *)
 
-let make_program name side_effect export_idents external_module_ids block : J.program = 
-  let modules = 
-    List.map (fun id -> Lam_module_ident.id id, string_of_module_id id )
-      external_module_ids in
+let make_program name  export_idents block : J.program = 
 
   {
     name;
-    modules; 
+
     exports = export_idents ; 
     export_set = Ident_set.of_list export_idents;
     block = block;
-    side_effect ; 
+
   }
-
+let decorate_deps modules side_effect program : J.deps_program = 
+
+  { program ; modules ; side_effect }
+

jscomp/js_program_loader.mli

@@ -30,5 +30,11 @@
 
 val make_program : 
     string -> 
-    string option -> 
-    Ident.t list -> Lam_module_ident.t list -> J.block -> J.program
+    Ident.t list -> J.block -> J.program
+
+val decorate_deps : 
+  J.required_modules ->
+  string option ->
+  J.program -> J.deps_program
+
+val string_of_module_id : Lam_module_ident.t -> string

jscomp/lam_compile_group.ml

@@ -150,9 +150,9 @@ let compile_group ({filename = file_name; env;} as meta : Lam_stats.meta)
 
 (** Actually simplify_lets is kind of global optimization since it requires you to know whether 
     it's used or not 
+    [non_export] is only used in playground
 *)
-let compile  ~filename non_export env _sigs lam  : J.program  = 
-
+let compile  ~filename non_export env _sigs lam   = 
   let export_idents = 
     if non_export then
       []    
@@ -305,35 +305,41 @@ let compile  ~filename non_export env _sigs lam  : J.program  =
             |> Js_output.concat
             |> Js_output.to_block
           in
-          let external_module_ids = 
-            Lam_compile_env.get_requried_modules  
-              meta.env
-              meta.required_modules  
-              (Js_fold_basic.calculate_hard_dependencies body)
-          in
-          (* Exporting ... *)
-          let v = 
-            Lam_stats_util.export_to_cmj meta  maybe_pure external_module_ids
-              (if non_export then [] else lambda_exports) 
-          in
-          (if not @@ Ext_string.is_empty filename then
-            Js_cmj_format.to_file 
-              (Ext_filename.chop_extension ~loc:__LOC__  filename ^ ".cmj") v);
-          let js = 
-            Js_program_loader.make_program filename v.pure meta.exports
-              external_module_ids body 
-          in
           (* The file is not big at all compared with [cmo] *)
           (* Ext_marshal.to_file (Ext_filename.chop_extension filename ^ ".mj")  js; *)
-
+          let js = 
+            Js_program_loader.make_program filename meta.exports
+              body 
+          in
           js 
           |> Js_pass_flatten.program
           |> Js_inline_and_eliminate.inline_and_shake
 
           |> Js_pass_flatten_and_mark_dead.program
           |> (fun js -> ignore @@ Js_pass_scope.program  js ; js )
           |> Js_shake.shake_program
-
+          |> ( fun (js:  J.program) -> 
+            let external_module_ids = 
+              Lam_compile_env.get_requried_modules  
+                meta.env
+                meta.required_modules  
+                (Js_fold_basic.calculate_hard_dependencies js.block)
+            in
+            let required_modules =
+              List.map 
+                (fun id -> Lam_module_ident.id id, Js_program_loader.string_of_module_id id )
+                external_module_ids in
+
+            (* Exporting ... *)
+            let v = 
+              Lam_stats_util.export_to_cmj meta  maybe_pure external_module_ids
+                (if non_export then [] else lambda_exports) 
+            in
+            (if not @@ Ext_string.is_empty filename then
+               Js_cmj_format.to_file 
+                 (Ext_filename.chop_extension ~loc:__LOC__  filename ^ ".cmj") v);
+            Js_program_loader.decorate_deps required_modules v.pure js
+          )
         | _ -> raise Not_a_module
       end
     | _ -> raise Not_a_module end

jscomp/lam_compile_group.mli

@@ -34,7 +34,7 @@ val compile :
   Env.t -> 
   Types.signature -> 
   Lambda.lambda -> 
-  J.program
+  J.deps_program
 
 val lambda_as_module :  
   Env.t ->

jscomp/test/string_runtime_test.js

@@ -4,8 +4,8 @@
 var Caml_string = require("../runtime/caml_string");
 var Mt          = require("./mt");
 var $$String    = require("../stdlib/string");
-var Caml_string = require("../runtime/caml_string");
 var List        = require("../stdlib/list");
+var Caml_string = require("../runtime/caml_string");
 
 var suites_001 = [
   /* tuple */0,