Wasm text file preprocessor

CHANGES.md

@@ -1,3 +1,8 @@
+# dev
+
+## Features/Changes
+* Compiler: use a Wasm text files preprocessor (#1822)
+
 # 6.0.1 (2025-02-07) - Lille
 
 ## Features/Changes

compiler/bin-wasm_of_ocaml/compile.ml

@@ -73,6 +73,14 @@ let output_gen output_file f =
   Code.Var.set_stable (Config.Flag.stable_var ());
   Filename.gen_file output_file f
 
+let with_runtime_files ~runtime_wasm_files f =
+  let inputs =
+    List.map
+      ~f:(fun file -> { Wat_preprocess.module_name = "env"; file; source = File })
+      runtime_wasm_files
+  in
+  Wat_preprocess.with_preprocessed_files ~variables:[] ~inputs f
+
 let link_and_optimize
     ~profile
     ~sourcemap_root
@@ -100,11 +108,15 @@ let link_and_optimize
      then Some (Filename.temp_file "wasm-merged" ".wasm.map")
      else None)
   @@ fun opt_temp_sourcemap ->
+  (with_runtime_files ~runtime_wasm_files
+  @@ fun runtime_inputs ->
   Binaryen.link
-    ~runtime_files:(runtime_file :: runtime_wasm_files)
-    ~input_files:wat_files
+    ~inputs:
+      (({ Binaryen.module_name = "env"; file = runtime_file } :: runtime_inputs)
+      @ List.map ~f:(fun file -> { Binaryen.module_name = "OCaml"; file }) wat_files)
     ~opt_output_sourcemap:opt_temp_sourcemap
-    ~output_file:temp_file;
+    ~output_file:temp_file
+    ());
   Fs.with_intermediate_file (Filename.temp_file "wasm-dce" ".wasm")
   @@ fun temp_file' ->
   opt_with
@@ -124,7 +136,8 @@ let link_and_optimize
     ~opt_input_sourcemap:opt_temp_sourcemap'
     ~opt_output_sourcemap:opt_sourcemap
     ~input_file:temp_file'
-    ~output_file;
+    ~output_file
+    ();
   Option.iter
     ~f:(update_sourcemap ~sourcemap_root ~sourcemap_don't_inline_content)
     opt_sourcemap_file;
@@ -138,25 +151,31 @@ let link_runtime ~profile runtime_wasm_files output_file =
     @@ fun extra_runtime ->
     Fs.with_intermediate_file (Filename.temp_file "merged_runtime" ".wasm")
     @@ fun temp_file ->
+    (with_runtime_files ~runtime_wasm_files
+    @@ fun runtime_inputs ->
     Binaryen.link
       ~opt_output_sourcemap:None
-      ~runtime_files:runtime_wasm_files
-      ~input_files:[]
-      ~output_file:temp_file;
+      ~inputs:runtime_inputs
+      ~output_file:temp_file
+      ());
     Binaryen.optimize
       ~profile
       ~opt_input_sourcemap:None
       ~opt_output_sourcemap:None
       ~input_file:temp_file
-      ~output_file:extra_runtime;
+      ~output_file:extra_runtime
+      ();
     Fs.with_intermediate_file (Filename.temp_file "runtime" ".wasm")
     @@ fun runtime_file ->
     Fs.write_file ~name:runtime_file ~contents:Runtime_files.wasm_runtime;
     Binaryen.link
       ~opt_output_sourcemap:None
-      ~runtime_files:[ runtime_file; extra_runtime ]
-      ~input_files:[]
+      ~inputs:
+        (List.map
+           ~f:(fun file -> { Binaryen.module_name = "env"; file })
+           [ runtime_file; extra_runtime ])
       ~output_file
+      ()
 
 let generate_prelude ~out_file =
   Filename.gen_file out_file
@@ -196,7 +215,8 @@ let build_prelude z =
     ~input_file:prelude_file
     ~output_file:tmp_prelude_file
     ~opt_input_sourcemap:None
-    ~opt_output_sourcemap:None;
+    ~opt_output_sourcemap:None
+    ();
   Zip.add_file z ~name:"prelude.wasm" ~file:tmp_prelude_file;
   predefined_exceptions
 
@@ -423,7 +443,8 @@ let run
            ~opt_input_sourcemap:None
            ~opt_output_sourcemap:opt_tmp_map_file
            ~input_file:wat_file
-           ~output_file:tmp_wasm_file;
+           ~output_file:tmp_wasm_file
+           ();
          { Link.unit_name; unit_info; strings; fragments }
        in
        cont unit_data unit_name tmp_wasm_file opt_tmp_map_file

compiler/bin-wasm_of_ocaml/dune

@@ -1,6 +1,6 @@
-(executable
- (name wasm_of_ocaml)
- (public_name wasm_of_ocaml)
+(executables
+ (names wasm_of_ocaml wasmoo_link_wasm)
+ (public_names wasm_of_ocaml -)
  (package wasm_of_ocaml-compiler)
  (libraries
   jsoo_cmdline

compiler/bin-wasm_of_ocaml/info.ml

@@ -32,9 +32,9 @@ let make ~name ~doc ~description =
     ; `S "AUTHORS"
     ; `P "Jerome Vouillon, Hugo Heuzard."
     ; `S "LICENSE"
-    ; `P "Copyright (C) 2010-2024."
+    ; `P "Copyright (C) 2010-2025."
     ; `P
-        "js_of_ocaml is free software, you can redistribute it and/or modify it under \
+        "wasm_of_ocaml 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, with linking exception; either version 2.1 of the License, \
          or (at your option) any later version."

compiler/bin-wasm_of_ocaml/link_wasm.ml

@@ -0,0 +1,103 @@
+(* Wasm_of_ocaml compiler
+ * http://www.ocsigen.org/js_of_ocaml/
+ *
+ * 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, with linking exception;
+ * either version 2.1 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 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.
+ *)
+
+open Cmdliner
+open Js_of_ocaml_compiler.Stdlib
+open Wasm_of_ocaml_compiler
+
+type binaryen_options =
+  { common : string list
+  ; opt : string list
+  ; merge : string list
+  }
+
+type options =
+  { input_modules : (string * string) list
+  ; output_file : string
+  ; variables : Preprocess.variables
+  ; binaryen_options : binaryen_options
+  }
+
+let options =
+  let input_modules =
+    let doc =
+      "Specify an input module with name $(i,NAME) in Wasm text file $(i,FILE)."
+    in
+    Arg.(
+      value
+      & pos_right 0 (pair ~sep:':' string string) []
+      & info [] ~docv:"NAME:FILE" ~doc)
+  in
+  let output_file =
+    let doc = "Specify the Wasm binary output file $(docv)." in
+    Arg.(required & pos 0 (some string) None & info [] ~docv:"WASM_FILE" ~doc)
+  in
+  let binaryen_options =
+    let doc = "Pass option $(docv) to binaryen tools" in
+    Arg.(value & opt_all string [] & info [ "binaryen" ] ~docv:"OPT" ~doc)
+  in
+  let opt_options =
+    let doc = "Pass option $(docv) to $(b,wasm-opt)" in
+    Arg.(value & opt_all string [] & info [ "binaryen-opt" ] ~docv:"OPT" ~doc)
+  in
+  let merge_options =
+    let doc = "Pass option $(docv) to $(b,wasm-merge)" in
+    Arg.(value & opt_all string [] & info [ "binaryen-merge" ] ~docv:"OPT" ~doc)
+  in
+  let build_t input_modules output_file variables common opt merge =
+    `Ok
+      { input_modules; output_file; variables; binaryen_options = { common; opt; merge } }
+  in
+  let t =
+    Term.(
+      const build_t
+      $ input_modules
+      $ output_file
+      $ Preprocess.variable_options
+      $ binaryen_options
+      $ opt_options
+      $ merge_options)
+  in
+  Term.ret t
+
+let link
+    { input_modules; output_file; variables; binaryen_options = { common; merge; opt } } =
+  let inputs =
+    List.map
+      ~f:(fun (module_name, file) -> { Wat_preprocess.module_name; file; source = File })
+      input_modules
+  in
+  Runtime.build
+    ~link_options:(common @ merge)
+    ~opt_options:(common @ opt)
+    ~variables:(Preprocess.set_variables variables)
+    ~inputs
+    ~output_file
+
+let info =
+  Info.make
+    ~name:"link-wasm"
+    ~doc:"Wasm linker"
+    ~description:
+      "$(b,wasmoo_link_wasm) is a Wasm linker. It takes as input a list of Wasm text \
+       files, preprocesses them, links them together, and outputs a single Wasm binary \
+       module"
+
+let term = Cmdliner.Term.(const link $ options)
+
+let command = Cmdliner.Cmd.v info term

compiler/bin-wasm_of_ocaml/link_wasm.mli

@@ -0,0 +1,19 @@
+(* Wasm_of_ocaml compiler
+ * http://www.ocsigen.org/js_of_ocaml/
+ *
+ * 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, with linking exception;
+ * either version 2.1 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 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.
+ *)
+
+val command : unit Cmdliner.Cmd.t