2 files changed, 32 insertions, 16 deletions

diff --git a/js-runtime/reflect.js b/js-runtime/reflect.js
index 7ba19b7..a930547 100644
--- a/js-runtime/reflect.js
+++ b/js-runtime/reflect.js
@@ -1,3 +1,4 @@
+// -*- js2-basic-offset: 4 -*-
 class Char {
     constructor(codepoint) {
         this.codepoint = codepoint;
@@ -170,25 +171,33 @@ class Scheme {
         return new Scheme(instance, abi);
     }
 
-    init_module(mod) {
+    #init_module(mod) {
         mod.set_debug_handler({
             debug_str(x) { console.log(`debug: ${x}`); },
             debug_str_i32(x, y) { console.log(`debug: ${x}: ${y}`); },
             debug_str_scm: (x, y) => {
-                console.log(`debug: ${x}: ${repr(this.to_js(y))}`);
+                console.log(`debug: ${x}: ${repr(this.#to_js(y))}`);
             },
         });
-        let proc = new Procedure(this, mod.get_export('$load').value)
+        mod.set_ffi_handler({
+            procedure_to_extern: (obj) => {
+                const proc = this.#to_js(obj);
+                return (...args) => {
+                    return proc.call(...args);
+                };
+            }
+        });
+        let proc = new Procedure(this, mod.get_export('$load').value);
         return proc.call();
     }
     static async load_main(path, abi, user_imports = {}) {
         let mod = await SchemeModule.fetch_and_instantiate(path, abi, user_imports);
         let reflect = await mod.reflect();
-        return reflect.init_module(mod);
+        return reflect.#init_module(mod);
     }
-    async load_extension(path) {
-        let mod = await SchemeModule.fetch_and_instantiate(path, this.#abi);
-        return this.init_module(mod);
+    async load_extension(path, user_imports = {}) {
+        let mod = await SchemeModule.fetch_and_instantiate(path, this.#abi, user_imports);
+        return this.#init_module(mod);
     }
 
     #to_scm(js) {
@@ -222,7 +231,7 @@ class Scheme {
         }
     }
 
-    to_js(scm) {
+    #to_js(scm) {
         let api = this.#instance.exports;
         let descr = api.describe(scm);
         let handlers = {
@@ -238,8 +247,8 @@ class Scheme {
             bignum: () => api.bignum_value(scm),
             complex: () => new Complex(api.complex_real(scm),
                                        api.complex_imag(scm)),
-            fraction: () => new Fraction(this.to_js(api.fraction_num(scm)),
-                                         this.to_js(api.fraction_denom(scm))),
+            fraction: () => new Fraction(this.#to_js(api.fraction_num(scm)),
+                                         this.#to_js(api.fraction_denom(scm))),
             pair: () => new Pair(this, scm),
             'mutable-pair': () => new MutablePair(this, scm),
             vector: () => new Vector(this, scm),
@@ -278,16 +287,16 @@ class Scheme {
         argv = api.call(func, argv);
         let results = [];
         for (let idx = 0; idx < api.vector_length(argv); idx++)
-            results.push(this.to_js(api.vector_ref(argv, idx)))
+            results.push(this.#to_js(api.vector_ref(argv, idx)))
         return results;
     }
 
-    car(x) { return this.to_js(this.#instance.exports.car(x.obj)); }
-    cdr(x) { return this.to_js(this.#instance.exports.cdr(x.obj)); }
+    car(x) { return this.#to_js(this.#instance.exports.car(x.obj)); }
+    cdr(x) { return this.#to_js(this.#instance.exports.cdr(x.obj)); }
 
     vector_length(x) { return this.#instance.exports.vector_length(x.obj); }
     vector_ref(x, i) {
-        return this.to_js(this.#instance.exports.vector_ref(x.obj, i));
+        return this.#to_js(this.#instance.exports.vector_ref(x.obj, i));
     }
 
     bytevector_length(x) {
@@ -359,6 +368,7 @@ class SchemeModule {
     #instance;
     #io_handler;
     #debug_handler;
+    #ffi_handler;
     static #rt = {
         bignum_from_string(str) { return BigInt(str); },
         bignum_from_i32(n) { return BigInt(n); },
@@ -492,10 +502,15 @@ class SchemeModule {
             debug_str_i32(x, y) { mod.#debug_handler.debug_str_i32(x, y); },
             debug_str_scm(x, y) { mod.#debug_handler.debug_str_scm(x, y); },
         }
+        let ffi = {
+            procedure_to_extern(proc) {
+                return mod.#ffi_handler.procedure_to_extern(proc);
+            }
+        };
         let imports = {
           rt: SchemeModule.#rt,
           abi: imported_abi,
-          debug, io, ...user_imports
+          debug, io, ffi, ...user_imports
         };
         let { module, instance } = await instantiate_streaming(path, imports);
         let mod = new SchemeModule(instance);
@@ -503,6 +518,7 @@ class SchemeModule {
     }
     set_io_handler(h) { this.#io_handler = h; }
     set_debug_handler(h) { this.#debug_handler = h; }
+    set_ffi_handler(h) { this.#ffi_handler = h; }
     all_exports() { return this.#instance.exports; }
     exported_abi() {
         let abi = {}
@@ -539,6 +555,6 @@ function repr(obj) {
         return flonum_to_string(obj);
     if (typeof obj === 'string')
         // FIXME: Improve to match Scheme.
-        return '"' + obj.replace(/(["\\])/g, '\\$1') + '"';
+        return '"' + obj.replace(/(["\\])/g, '\\$1').replace(/\n/g, '\\n') + '"';
     return obj + '';
 }
diff --git a/js-runtime/reflect.wasm b/js-runtime/reflect.wasm
index d3c857f..68441b9 100644
--- a/js-runtime/reflect.wasm
+++ b/js-runtime/reflect.wasm