WIP: bytecode module pre-compilation and loading infrastructure

- compile-modules.js: Node.js build tool, all 23 .sx files compile to .sxbc.json
- api_load_module with shared globals (beginModuleLoad/endModuleLoad batch API)
- api_compile_module for runtime compilation
- sx-platform.js: bytecode-first loader with source fallback, JSON deserializer
- Deferred JIT enable (setTimeout after boot)

Known issues:
- WASM browser: loadModule loads but functions not accessible (env writeback
  issue with interned keys)
- WASM browser: compileModule fails ("Not callable: nil" — compile-module
  function from bytecode not working correctly in WASM context)
- Node.js js_of_ocaml: full roundtrip works (compile → load → call)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hosts/ocaml/browser/sx-platform.js

@@ -197,6 +197,70 @@
     }
   })();
 
+  /**
+   * Deserialize type-tagged JSON constant back to JS value for loadModule.
+   */
+  function deserializeConstant(c) {
+    if (!c || !c.t) return null;
+    switch (c.t) {
+      case 's': return c.v;
+      case 'n': return c.v;
+      case 'b': return c.v;
+      case 'nil': return null;
+      case 'sym': return { _type: 'symbol', name: c.v };
+      case 'kw':  return { _type: 'keyword', name: c.v };
+      case 'list': return { _type: 'list', items: (c.v || []).map(deserializeConstant) };
+      case 'code': return {
+        _type: 'dict',
+        bytecode: { _type: 'list', items: c.v.bytecode },
+        constants: { _type: 'list', items: (c.v.constants || []).map(deserializeConstant) },
+        arity: c.v.arity || 0,
+        'upvalue-count': c.v['upvalue-count'] || 0,
+        locals: c.v.locals || 0,
+      };
+      case 'dict': {
+        var d = { _type: 'dict' };
+        for (var k in c.v) d[k] = deserializeConstant(c.v[k]);
+        return d;
+      }
+      default: return null;
+    }
+  }
+
+  /**
+   * Try loading a pre-compiled .sxbc.json bytecode module.
+   * Returns true on success, null on failure (caller falls back to .sx source).
+   */
+  function loadBytecodeFile(path) {
+    var bcPath = path.replace(/\.sx$/, '.sxbc.json');
+    var url = _baseUrl + bcPath + _cacheBust;
+    try {
+      var xhr = new XMLHttpRequest();
+      xhr.open("GET", url, false);
+      xhr.send();
+      if (xhr.status !== 200) return null;
+
+      var json = JSON.parse(xhr.responseText);
+      if (!json.module || json.magic !== 'SXBC') return null;
+
+      var module = {
+        _type: 'dict',
+        bytecode: { _type: 'list', items: json.module.bytecode },
+        constants: { _type: 'list', items: json.module.constants.map(deserializeConstant) },
+      };
+
+      var result = K.loadModule(module);
+      if (typeof result === 'string' && result.indexOf('Error') === 0) {
+        console.warn("[sx-platform] bytecode FAIL " + path + ":", result);
+        return null;
+      }
+      console.log("[sx-platform]  ok " + path + " (bytecode)");
+      return true;
+    } catch(e) {
+      return null;
+    }
+  }
+
   /**
    * Load an .sx file synchronously via XHR (boot-time only).
    * Returns the number of expressions loaded, or an error string.
@@ -227,7 +291,7 @@
 
   /**
    * Load all web adapter .sx files in dependency order.
-   * Called after the 8 FFI primitives are registered.
+   * Tries pre-compiled bytecode first, falls back to source.
    */
   function loadWebStack() {
     var files = [
@@ -264,12 +328,19 @@
       "sx/boot.sx",
     ];
 
-    var loaded = 0;
+    var loaded = 0, bcCount = 0, srcCount = 0;
+    if (K.beginModuleLoad) K.beginModuleLoad();
     for (var i = 0; i < files.length; i++) {
-      var r = loadSxFile(files[i]);
-      if (typeof r === "number") loaded += r;
+      var r = loadBytecodeFile(files[i]);
+      if (r) { bcCount++; continue; }
+      // Bytecode not available — end batch, load source, restart batch
+      if (K.endModuleLoad) K.endModuleLoad();
+      r = loadSxFile(files[i]);
+      if (typeof r === "number") { loaded += r; srcCount++; }
+      if (K.beginModuleLoad) K.beginModuleLoad();
     }
-    console.log("[sx-platform] Loaded " + loaded + " expressions from " + files.length + " files");
+    if (K.endModuleLoad) K.endModuleLoad();
+    console.log("[sx-platform] Loaded " + files.length + " files (" + bcCount + " bytecode, " + srcCount + " source, " + loaded + " exprs)");
     return loaded;
   }
 
@@ -306,8 +377,8 @@
         // Debug islands
         console.log("[sx] ~home/stepper defined?", K.eval("(type-of ~home/stepper)"));
         console.log("[sx] ~layouts/header defined?", K.eval("(type-of ~layouts/header)"));
-        // Try manual island query
-        console.log("[sx] manual island query:", K.eval("(len (dom-query-all (dom-body) \"[data-sx-island]\"))"));
+        // Island count (JS-side, avoids VM overhead)
+        console.log("[sx] manual island query:", document.querySelectorAll("[data-sx-island]").length);
         // Try hydrating again
         console.log("[sx] retry hydrate-islands...");
         K.eval("(sx-hydrate-islands nil)");
@@ -339,7 +410,8 @@
     var _doInit = function() {
       loadWebStack();
       Sx.init();
-      K.eval('(enable-jit!)');
+      // Enable JIT after all boot code has run
+      setTimeout(function() { K.eval('(enable-jit!)'); }, 0);
     };
 
     if (document.readyState === "loading") {

hosts/ocaml/browser/sx_browser.ml

@@ -231,17 +231,46 @@ let api_load src_js =
   | Eval_error msg -> Js.Unsafe.inject (Js.string ("Error: " ^ msg))
   | Parse_error msg -> Js.Unsafe.inject (Js.string ("Parse error: " ^ msg))
 
+(* Shared globals table for batch module loading.
+   Created by beginModuleLoad, accumulated across loadModule calls,
+   flushed to env by endModuleLoad. Ensures closures from early
+   modules can see definitions from later modules. *)
+let _module_globals : (string, value) Hashtbl.t option ref = ref None
+
+let api_begin_module_load () =
+  let g = Hashtbl.create 512 in
+  Hashtbl.iter (fun id v -> Hashtbl.replace g (unintern id) v) global_env.bindings;
+  _module_globals := Some g;
+  Js.Unsafe.inject true
+
+let api_end_module_load () =
+  (match !_module_globals with
+   | Some g ->
+     Hashtbl.iter (fun k v ->
+       Hashtbl.replace global_env.bindings (intern k) v
+     ) g;
+     _module_globals := None
+   | None -> ());
+  Js.Unsafe.inject true
+
 let api_load_module module_js =
   try
     let code_val = js_to_value module_js in
     let code = Sx_vm.code_from_value code_val in
-    let globals = Hashtbl.create 256 in
-    Hashtbl.iter (fun id v -> Hashtbl.replace globals (unintern id) v) global_env.bindings;
+    let globals = match !_module_globals with
+      | Some g -> g  (* use shared table *)
+      | None ->
+        (* standalone mode: create temp table *)
+        let g = Hashtbl.create 256 in
+        Hashtbl.iter (fun id v -> Hashtbl.replace g (unintern id) v) global_env.bindings;
+        g
+    in
     let _result = Sx_vm.execute_module code globals in
-    (* Copy all globals back into env — new defines + unchanged values *)
-    Hashtbl.iter (fun k v ->
-      Hashtbl.replace global_env.bindings (intern k) v
-    ) globals;
+    (* If standalone (no batch), copy back immediately *)
+    if !_module_globals = None then
+      Hashtbl.iter (fun k v ->
+        Hashtbl.replace global_env.bindings (intern k) v
+      ) globals;
     Js.Unsafe.inject (Hashtbl.length globals)
   with
   | Eval_error msg -> Js.Unsafe.inject (Js.string ("Error: " ^ msg))
@@ -653,6 +682,8 @@ let () =
   Js.Unsafe.set sx (Js.string "renderToHtml") (Js.wrap_callback api_render_to_html);
   Js.Unsafe.set sx (Js.string "load") (Js.wrap_callback api_load);
   Js.Unsafe.set sx (Js.string "loadModule") (Js.wrap_callback api_load_module);
+  Js.Unsafe.set sx (Js.string "beginModuleLoad") (Js.wrap_callback (fun () -> api_begin_module_load ()));
+  Js.Unsafe.set sx (Js.string "endModuleLoad") (Js.wrap_callback (fun () -> api_end_module_load ()));
   Js.Unsafe.set sx (Js.string "compileModule") (wrap api_compile_module);
   Js.Unsafe.set sx (Js.string "typeOf") (Js.wrap_callback api_type_of);
   Js.Unsafe.set sx (Js.string "inspect") (Js.wrap_callback api_inspect);

shared/static/wasm/sx-platform.js

@@ -197,6 +197,70 @@
     }
   })();
 
+  /**
+   * Deserialize type-tagged JSON constant back to JS value for loadModule.
+   */
+  function deserializeConstant(c) {
+    if (!c || !c.t) return null;
+    switch (c.t) {
+      case 's': return c.v;
+      case 'n': return c.v;
+      case 'b': return c.v;
+      case 'nil': return null;
+      case 'sym': return { _type: 'symbol', name: c.v };
+      case 'kw':  return { _type: 'keyword', name: c.v };
+      case 'list': return { _type: 'list', items: (c.v || []).map(deserializeConstant) };
+      case 'code': return {
+        _type: 'dict',
+        bytecode: { _type: 'list', items: c.v.bytecode },
+        constants: { _type: 'list', items: (c.v.constants || []).map(deserializeConstant) },
+        arity: c.v.arity || 0,
+        'upvalue-count': c.v['upvalue-count'] || 0,
+        locals: c.v.locals || 0,
+      };
+      case 'dict': {
+        var d = { _type: 'dict' };
+        for (var k in c.v) d[k] = deserializeConstant(c.v[k]);
+        return d;
+      }
+      default: return null;
+    }
+  }
+
+  /**
+   * Try loading a pre-compiled .sxbc.json bytecode module.
+   * Returns true on success, null on failure (caller falls back to .sx source).
+   */
+  function loadBytecodeFile(path) {
+    var bcPath = path.replace(/\.sx$/, '.sxbc.json');
+    var url = _baseUrl + bcPath + _cacheBust;
+    try {
+      var xhr = new XMLHttpRequest();
+      xhr.open("GET", url, false);
+      xhr.send();
+      if (xhr.status !== 200) return null;
+
+      var json = JSON.parse(xhr.responseText);
+      if (!json.module || json.magic !== 'SXBC') return null;
+
+      var module = {
+        _type: 'dict',
+        bytecode: { _type: 'list', items: json.module.bytecode },
+        constants: { _type: 'list', items: json.module.constants.map(deserializeConstant) },
+      };
+
+      var result = K.loadModule(module);
+      if (typeof result === 'string' && result.indexOf('Error') === 0) {
+        console.warn("[sx-platform] bytecode FAIL " + path + ":", result);
+        return null;
+      }
+      console.log("[sx-platform]  ok " + path + " (bytecode)");
+      return true;
+    } catch(e) {
+      return null;
+    }
+  }
+
   /**
    * Load an .sx file synchronously via XHR (boot-time only).
    * Returns the number of expressions loaded, or an error string.
@@ -227,7 +291,7 @@
 
   /**
    * Load all web adapter .sx files in dependency order.
-   * Called after the 8 FFI primitives are registered.
+   * Tries pre-compiled bytecode first, falls back to source.
    */
   function loadWebStack() {
     var files = [
@@ -264,12 +328,19 @@
       "sx/boot.sx",
     ];
 
-    var loaded = 0;
+    var loaded = 0, bcCount = 0, srcCount = 0;
+    if (K.beginModuleLoad) K.beginModuleLoad();
     for (var i = 0; i < files.length; i++) {
-      var r = loadSxFile(files[i]);
-      if (typeof r === "number") loaded += r;
+      var r = loadBytecodeFile(files[i]);
+      if (r) { bcCount++; continue; }
+      // Bytecode not available — end batch, load source, restart batch
+      if (K.endModuleLoad) K.endModuleLoad();
+      r = loadSxFile(files[i]);
+      if (typeof r === "number") { loaded += r; srcCount++; }
+      if (K.beginModuleLoad) K.beginModuleLoad();
     }
-    console.log("[sx-platform] Loaded " + loaded + " expressions from " + files.length + " files");
+    if (K.endModuleLoad) K.endModuleLoad();
+    console.log("[sx-platform] Loaded " + files.length + " files (" + bcCount + " bytecode, " + srcCount + " source, " + loaded + " exprs)");
     return loaded;
   }
 
@@ -339,7 +410,8 @@
     var _doInit = function() {
       loadWebStack();
       Sx.init();
-      K.eval('(enable-jit!)');
+      // Enable JIT after all boot code has run
+      setTimeout(function() { K.eval('(enable-jit!)'); }, 0);
     };
 
     if (document.readyState === "loading") {

shared/static/wasm/sx/freeze.sxbc.json

@@ -0,0 +1 @@
+{"magic":"SXBC","version":1,"hash":"19bca721c37b25b6","module":{"bytecode":[52,1,0,0,128,0,0,5,51,3,0,128,2,0,5,51,5,0,128,4,0,5,51,7,0,128,6,0,5,51,9,0,128,8,0,5,51,11,0,128,10,0,5,51,13,0,128,12,0,5,51,15,0,128,14,0,5,51,17,0,128,16,0,50],"constants":[{"t":"s","v":"freeze-registry"},{"t":"s","v":"dict"},{"t":"s","v":"freeze-signal"},{"t":"code","v":{"bytecode":[1,1,0,2,52,0,0,2,17,2,16,2,33,56,0,20,3,0,16,2,52,2,0,2,6,34,5,0,5,52,4,0,0,17,3,20,5,0,16,3,1,7,0,16,0,1,8,0,16,1,52,6,0,4,48,2,5,20,3,0,16,2,16,3,52,9,0,3,32,1,0,2,50],"constants":[{"t":"s","v":"context"},{"t":"s","v":"sx-freeze-scope"},{"t":"s","v":"get"},{"t":"s","v":"freeze-registry"},{"t":"s","v":"list"},{"t":"s","v":"append!"},{"t":"s","v":"dict"},{"t":"s","v":"name"},{"t":"s","v":"signal"},{"t":"s","v":"dict-set!"}]}},{"t":"s","v":"freeze-scope"},{"t":"code","v":{"bytecode":[1,1,0,16,0,52,0,0,2,5,20,3,0,16,0,52,4,0,0,52,2,0,3,5,20,5,0,16,1,2,48,2,5,1,1,0,52,6,0,1,5,2,50],"constants":[{"t":"s","v":"scope-push!"},{"t":"s","v":"sx-freeze-scope"},{"t":"s","v":"dict-set!"},{"t":"s","v":"freeze-registry"},{"t":"s","v":"list"},{"t":"s","v":"cek-call"},{"t":"s","v":"scope-pop!"}]}},{"t":"s","v":"cek-freeze-scope"},{"t":"code","v":{"bytecode":[20,1,0,16,0,52,0,0,2,6,34,5,0,5,52,2,0,0,17,1,52,3,0,0,17,2,51,5,0,1,2,16,1,52,4,0,2,5,1,6,0,16,0,1,7,0,16,2,52,3,0,4,50],"constants":[{"t":"s","v":"get"},{"t":"s","v":"freeze-registry"},{"t":"s","v":"list"},{"t":"s","v":"dict"},{"t":"s","v":"for-each"},{"t":"code","v":{"bytecode":[18,0,16,0,1,2,0,52,1,0,2,20,3,0,16,0,1,4,0,52,1,0,2,48,1,52,0,0,3,50],"constants":[{"t":"s","v":"dict-set!"},{"t":"s","v":"get"},{"t":"s","v":"name"},{"t":"s","v":"signal-value"},{"t":"s","v":"signal"}]}},{"t":"s","v":"name"},{"t":"s","v":"signals"}]}},{"t":"s","v":"cek-freeze-all"},{"t":"code","v":{"bytecode":[51,1,0,20,3,0,52,2,0,1,52,0,0,2,50],"constants":[{"t":"s","v":"map"},{"t":"code","v":{"bytecode":[20,0,0,16,0,49,1,50],"constants":[{"t":"s","v":"cek-freeze-scope"}]}},{"t":"s","v":"keys"},{"t":"s","v":"freeze-registry"}]}},{"t":"s","v":"cek-thaw-scope"},{"t":"code","v":{"bytecode":[20,1,0,16,0,52,0,0,2,6,34,5,0,5,52,2,0,0,17,2,16,1,1,3,0,52,0,0,2,17,3,16,3,33,14,0,51,5,0,1,3,16,2,52,4,0,2,32,1,0,2,50],"constants":[{"t":"s","v":"get"},{"t":"s","v":"freeze-registry"},{"t":"s","v":"list"},{"t":"s","v":"signals"},{"t":"s","v":"for-each"},{"t":"code","v":{"bytecode":[16,0,1,1,0,52,0,0,2,17,1,16,0,1,2,0,52,0,0,2,17,2,18,0,16,1,52,0,0,2,17,3,16,3,52,4,0,1,52,3,0,1,33,12,0,20,5,0,16,2,16,3,49,2,32,1,0,2,50],"constants":[{"t":"s","v":"get"},{"t":"s","v":"name"},{"t":"s","v":"signal"},{"t":"s","v":"not"},{"t":"s","v":"nil?"},{"t":"s","v":"reset!"}]}}]}},{"t":"s","v":"cek-thaw-all"},{"t":"code","v":{"bytecode":[51,1,0,16,0,52,0,0,2,50],"constants":[{"t":"s","v":"for-each"},{"t":"code","v":{"bytecode":[20,0,0,16,0,1,2,0,52,1,0,2,16,0,49,2,50],"constants":[{"t":"s","v":"cek-thaw-scope"},{"t":"s","v":"get"},{"t":"s","v":"name"}]}}]}},{"t":"s","v":"freeze-to-sx"},{"t":"code","v":{"bytecode":[20,0,0,20,1,0,16,0,48,1,49,1,50],"constants":[{"t":"s","v":"sx-serialize"},{"t":"s","v":"cek-freeze-scope"}]}},{"t":"s","v":"thaw-from-sx"},{"t":"code","v":{"bytecode":[20,0,0,16,0,48,1,17,1,16,1,52,2,0,1,52,1,0,1,33,27,0,16,1,52,3,0,1,17,2,20,4,0,16,2,1,6,0,52,5,0,2,16,2,49,2,32,1,0,2,50],"constants":[{"t":"s","v":"sx-parse"},{"t":"s","v":"not"},{"t":"s","v":"empty?"},{"t":"s","v":"first"},{"t":"s","v":"cek-thaw-scope"},{"t":"s","v":"get"},{"t":"s","v":"name"}]}}]}}

shared/static/wasm/sx/harness-reactive.sxbc.json

@@ -0,0 +1 @@
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shared/static/wasm/sx/signals.sxbc.json

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shared/static/wasm/sx_browser.bc.wasm.js

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