Wasm_of_ocaml support: alternative design

Signed-off-by: Jérôme Vouillon <jerome.vouillon@gmail.com>

.github/workflows/workflow.yml

@@ -258,7 +258,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: ocaml-wasm/wasm_of_ocaml
-          ref: target-dir
+          ref: wasm-dune
           path: wasm_of_ocaml
 
       - name: Install Wasm_of_ocaml

bin/printenv.ml

@@ -27,13 +27,25 @@ let dump sctx ~dir =
     |> Action_builder.of_memo
     >>= Dune_rules.Menhir_env.dump
   and+ coq_dump = Dune_rules.Coq.Coq_rules.coq_env ~dir >>| Dune_rules.Coq.Coq_flags.dump
-  and+ jsoo_dump =
+  and+ jsoo_js_dump =
     let module Js_of_ocaml = Dune_rules.Js_of_ocaml in
-    let* jsoo = Action_builder.of_memo (Dune_rules.Jsoo_rules.jsoo_env ~dir) in
-    Js_of_ocaml.Flags.dump jsoo.flags
+    let* jsoo = Action_builder.of_memo (Dune_rules.Jsoo_rules.jsoo_env ~dir ~mode:JS) in
+    Js_of_ocaml.Flags.dump ~mode:JS jsoo.flags
+  and+ jsoo_wasm_dump =
+    let module Js_of_ocaml = Dune_rules.Js_of_ocaml in
+    let* jsoo = Action_builder.of_memo (Dune_rules.Jsoo_rules.jsoo_env ~dir ~mode:Wasm) in
+    Js_of_ocaml.Flags.dump ~mode:Wasm jsoo.flags
   in
   let env =
-    List.concat [ o_dump; c_dump; link_flags_dump; menhir_dump; coq_dump; jsoo_dump ]
+    List.concat
+      [ o_dump
+      ; c_dump
+      ; link_flags_dump
+      ; menhir_dump
+      ; coq_dump
+      ; jsoo_js_dump
+      ; jsoo_wasm_dump
+      ]
   in
   Super_context.context sctx |> Context.name, env
 ;;

src/dune_lang/binary_kind.ml

@@ -6,7 +6,6 @@ type t =
   | Object
   | Shared_object
   | Plugin
-  | Js
 
 let compare x y =
   match x, y with
@@ -23,9 +22,6 @@ let compare x y =
   | Shared_object, _ -> Lt
   | _, Shared_object -> Gt
   | Plugin, Plugin -> Eq
-  | Plugin, _ -> Lt
-  | _, Plugin -> Gt
-  | Js, Js -> Eq
 ;;
 
 let decode =
@@ -37,7 +33,6 @@ let decode =
     ; "object", return Object
     ; "shared_object", return Shared_object
     ; "plugin", Syntax.since Stanza.syntax (2, 4) >>> return Plugin
-    ; "js", Syntax.since Stanza.syntax (1, 11) >>> return Js
     ]
 ;;
 
@@ -47,9 +42,8 @@ let to_string = function
   | Object -> "object"
   | Shared_object -> "shared_object"
   | Plugin -> "plugin"
-  | Js -> "js"
 ;;
 
 let to_dyn t = Dyn.variant (to_string t) []
 let encode t = Dune_sexp.atom (to_string t)
-let all = [ C; Exe; Object; Shared_object; Plugin; Js ]
+let all = [ C; Exe; Object; Shared_object; Plugin ]

src/dune_lang/binary_kind.mli

@@ -6,7 +6,6 @@ type t =
   | Object
   | Shared_object
   | Plugin
-  | Js
 
 val compare : t -> t -> Ordering.t
 

src/dune_rules/cinaps.ml

@@ -179,7 +179,7 @@ let gen_rules sctx t ~dir ~scope =
       ~requires_compile
       ~requires_link
       ~flags:(Ocaml_flags.of_list [ "-w"; "-24" ])
-      ~js_of_ocaml:None
+      ~js_of_ocaml:(Js_of_ocaml.Mode.Pair.make None)
       ~melange_package_name:None
       ~package:None
   in

src/dune_rules/compilation_context.ml

@@ -87,7 +87,7 @@ type t =
   ; preprocessing : Pp_spec.t
   ; opaque : bool
   ; stdlib : Ocaml_stdlib.t option
-  ; js_of_ocaml : Js_of_ocaml.In_context.t option
+  ; js_of_ocaml : Js_of_ocaml.In_context.t option Js_of_ocaml.Mode.Pair.t
   ; sandbox : Sandbox_config.t
   ; package : Package.t option
   ; vimpl : Vimpl.t option

src/dune_rules/compilation_context.mli

@@ -30,7 +30,7 @@ val create
   -> ?preprocessing:Pp_spec.t
   -> opaque:opaque
   -> ?stdlib:Ocaml_stdlib.t
-  -> js_of_ocaml:Js_of_ocaml.In_context.t option
+  -> js_of_ocaml:Js_of_ocaml.In_context.t option Js_of_ocaml.Mode.Pair.t
   -> package:Package.t option
   -> melange_package_name:Lib_name.t option
   -> ?vimpl:Vimpl.t
@@ -61,7 +61,7 @@ val includes : t -> Command.Args.without_targets Command.Args.t Lib_mode.Cm_kind
 val preprocessing : t -> Pp_spec.t
 val opaque : t -> bool
 val stdlib : t -> Ocaml_stdlib.t option
-val js_of_ocaml : t -> Js_of_ocaml.In_context.t option
+val js_of_ocaml : t -> Js_of_ocaml.In_context.t option Js_of_ocaml.Mode.Pair.t
 val sandbox : t -> Sandbox_config.t
 val set_sandbox : t -> Sandbox_config.t -> t
 val package : t -> Package.t option

src/dune_rules/dir_status.ml

@@ -134,36 +134,25 @@ let directory_targets_of_rule ~dir { Rule_conf.targets; loc = rule_loc; enabled_
     when_enabled ~dir ~enabled_if directory_targets
 ;;
 
-let jsoo_wasm_enabled
-  ~(jsoo_submodes :
-     dir:Path.Build.t
-     -> submodes:Js_of_ocaml.Submode.Set.t option
-     -> Js_of_ocaml.Submode.t list Memo.t)
-  ~dir
-  ~submodes
-  =
-  let+ submodes = jsoo_submodes ~dir ~submodes in
-  List.mem ~equal:Js_of_ocaml.Submode.equal submodes Wasm
+let jsoo_wasm_enabled ~jsoo_enabled ~dir ~(buildable : Buildable.t) =
+  let* expander = Expander0.get ~dir in
+  jsoo_enabled
+    ~eval:(Expander0.eval_blang expander)
+    ~dir
+    ~in_context:(Js_of_ocaml.In_context.make ~dir buildable.js_of_ocaml)
+    ~mode:Js_of_ocaml.Mode.Wasm
 ;;
 
 let directory_targets_of_executables
-  ~jsoo_submodes
+  ~jsoo_enabled
   ~dir
   { Executables.names; modes; enabled_if; buildable; _ }
   =
   let* directory_targets =
     (* CR-someday rgrinberg: we don't necessarily need to evalute
-       [explicit_js_mode] or [wasm_enabled] here *)
-    let+ wasm_enabled =
-      jsoo_wasm_enabled ~jsoo_submodes ~dir ~submodes:buildable.js_of_ocaml.submodes
-    and+ explicit_js_mode =
-      Scope.DB.find_by_dir dir >>| Scope.project >>| Dune_project.explicit_js_mode
-    in
-    match
-      Executables.Link_mode.(
-        Map.mem modes js || ((not explicit_js_mode) && Map.mem modes byte))
-      && wasm_enabled
-    with
+       [wasm_enabled] here *)
+    let+ wasm_enabled = jsoo_wasm_enabled ~jsoo_enabled ~dir ~buildable in
+    match Executables.Link_mode.(Map.mem modes wasm) && wasm_enabled with
     | false -> Path.Build.Map.empty
     | true ->
       Nonempty_list.to_list names
@@ -175,15 +164,15 @@ let directory_targets_of_executables
 ;;
 
 let directory_targets_of_library
-  ~jsoo_submodes
+  ~jsoo_enabled
   ~dir
   { Library.sub_systems; name; enabled_if; buildable; _ }
   =
   let* directory_targets =
     match Sub_system_name.Map.find sub_systems Inline_tests_info.Tests.name with
     | Some (Inline_tests_info.Tests.T { modes; loc; enabled_if; _ })
-      when Inline_tests_info.Mode_conf.Set.mem modes Javascript ->
-      jsoo_wasm_enabled ~jsoo_submodes ~dir ~submodes:buildable.js_of_ocaml.submodes
+      when Inline_tests_info.Mode_conf.Set.mem modes (Jsoo Wasm) ->
+      jsoo_wasm_enabled ~jsoo_enabled ~dir ~buildable
       >>| (function
              | false -> Path.Build.Map.empty
              | true ->
@@ -207,13 +196,13 @@ let directory_targets_of_library
   when_enabled ~dir ~enabled_if directory_targets
 ;;
 
-let extract_directory_targets ~jsoo_submodes ~dir stanzas =
+let extract_directory_targets ~jsoo_enabled ~dir stanzas =
   Memo.parallel_map stanzas ~f:(fun stanza ->
     match Stanza.repr stanza with
     | Rule_conf.T rule -> directory_targets_of_rule ~dir rule
     | Executables.T exes | Tests.T { exes; _ } ->
-      directory_targets_of_executables ~jsoo_submodes ~dir exes
-    | Library.T lib -> directory_targets_of_library ~jsoo_submodes ~dir lib
+      directory_targets_of_executables ~jsoo_enabled ~dir exes
+    | Library.T lib -> directory_targets_of_library ~jsoo_enabled ~dir lib
     | Coq_stanza.Theory.T m ->
       (* It's unfortunate that we need to pull in the coq rules here. But
          we don't have a generic mechanism for this yet. *)
@@ -360,15 +349,15 @@ end = struct
   ;;
 end
 
-let directory_targets t ~jsoo_submodes ~dir =
+let directory_targets t ~jsoo_enabled ~dir =
   match t with
   | Lock_dir | Generated | Source_only _ | Is_component_of_a_group_but_not_the_root _ ->
     Memo.return Path.Build.Map.empty
   | Standalone (_, dune_file) ->
-    Dune_file.stanzas dune_file >>= extract_directory_targets ~jsoo_submodes ~dir
+    Dune_file.stanzas dune_file >>= extract_directory_targets ~jsoo_enabled ~dir
   | Group_root { components; dune_file; _ } ->
     let f ~dir stanzas acc =
-      extract_directory_targets ~jsoo_submodes ~dir stanzas
+      extract_directory_targets ~jsoo_enabled ~dir stanzas
       >>| Path.Build.Map.superpose acc
     in
     let* init =

src/dune_rules/dir_status.mli

@@ -44,9 +44,11 @@ end
 
 val directory_targets
   :  t
-  -> jsoo_submodes:
-       (dir:Path.Build.t
-        -> submodes:Js_of_ocaml.Submode.Set.t option
-        -> Js_of_ocaml.Submode.t list Memo.t)
+  -> jsoo_enabled:
+       (eval:(Blang.t -> bool Memo.t)
+        -> dir:Path.Build.t
+        -> in_context:Js_of_ocaml.In_context.t Js_of_ocaml.Mode.Pair.t
+        -> mode:Js_of_ocaml.Mode.t
+        -> bool Memo.t)
   -> dir:Path.Build.t
   -> Loc.t Path.Build.Map.t Memo.t

src/dune_rules/dune_env.ml

@@ -80,6 +80,7 @@ type config =
   ; menhir : Ordered_set_lang.Unexpanded.t Menhir_env.t
   ; odoc : Odoc.t
   ; js_of_ocaml : Ordered_set_lang.Unexpanded.t Js_of_ocaml.Env.t
+  ; wasm_of_ocaml : Ordered_set_lang.Unexpanded.t Js_of_ocaml.Env.t
   ; coq : Coq_env.t
   ; format_config : Format_config.t option
   ; error_on_use : User_message.t option
@@ -102,6 +103,7 @@ let equal_config
   ; menhir
   ; odoc
   ; js_of_ocaml
+  ; wasm_of_ocaml
   ; coq
   ; format_config
   ; error_on_use
@@ -124,6 +126,7 @@ let equal_config
   && Coq_env.equal coq t.coq
   && Option.equal Format_config.equal format_config t.format_config
   && Js_of_ocaml.Env.equal js_of_ocaml t.js_of_ocaml
+  && Js_of_ocaml.Env.equal wasm_of_ocaml t.wasm_of_ocaml
   && Option.equal User_message.equal error_on_use t.error_on_use
   && Option.equal User_message.equal warn_on_load t.warn_on_load
   && Option.equal Bool.equal bin_annot t.bin_annot
@@ -141,6 +144,7 @@ let empty_config =
   ; menhir = Menhir_env.empty
   ; odoc = Odoc.empty
   ; js_of_ocaml = Js_of_ocaml.Env.empty
+  ; wasm_of_ocaml = Js_of_ocaml.Env.empty
   ; coq = Coq_env.default
   ; format_config = None
   ; error_on_use = None
@@ -224,6 +228,13 @@ let js_of_ocaml_field =
     (Dune_lang.Syntax.since Stanza.syntax (3, 0) >>> Js_of_ocaml.Env.decode)
 ;;
 
+let wasm_of_ocaml_field =
+  field
+    "wasm_of_ocaml"
+    ~default:Js_of_ocaml.Env.empty
+    (Dune_lang.Syntax.since Stanza.syntax (3, 17) >>> Js_of_ocaml.Env.decode)
+;;
+
 let bin_annot = field_o "bin_annot" (Dune_lang.Syntax.since Stanza.syntax (3, 8) >>> bool)
 
 let config =
@@ -241,6 +252,7 @@ let config =
   and+ menhir_flags = menhir_flags ~since:(2, 1) ~deleted_in:Menhir_stanza.explain_since
   and+ odoc = odoc_field
   and+ js_of_ocaml = js_of_ocaml_field
+  and+ wasm_of_ocaml = wasm_of_ocaml_field
   and+ coq = Coq_env.decode
   and+ format_config = Format_config.field ~since:(2, 8)
   and+ bin_annot = bin_annot in
@@ -261,6 +273,7 @@ let config =
   ; menhir
   ; odoc
   ; js_of_ocaml
+  ; wasm_of_ocaml
   ; coq
   ; format_config
   ; error_on_use = None

src/dune_rules/dune_env.mli

@@ -30,6 +30,7 @@ type config =
   ; menhir : Ordered_set_lang.Unexpanded.t Menhir_env.t
   ; odoc : Odoc.t
   ; js_of_ocaml : Ordered_set_lang.Unexpanded.t Js_of_ocaml.Env.t
+  ; wasm_of_ocaml : Ordered_set_lang.Unexpanded.t Js_of_ocaml.Env.t
   ; coq : Coq_env.t
   ; format_config : Format_config.t option
   ; error_on_use : User_message.t option