Allow the createWasm function to use async/await where possible

sbc100 · sbc100 · commit b85a44198551 · 2024-12-17T11:20:11.000-08:00
The advantage if using `await` in the cases where we can is that it
avoids the generation or wrapper function for each export.

So instead of

```
var wasmExport = createWasm(); // returns empty object
...
var malloc = ((..) =&gt; (malloc = wasmExports['malloc'])()
```

We can just generate:

```
var wasmExport = createWasm(); // returns empty object
...
var malloc = wasmExports['malloc'];
```

This only currently works in MODULARIZE mode where the code is running
inside a factory function.  Otherwise it would end up using
top-level-await.

One wrinkle here is that this is not currently supported when closure is
enabled because we run closure only on the contents of the factory
function so closure ends up seeing this as a top level await when its
not.
diff --git a/src/preamble.js b/src/preamble.js
@@ -1036,11 +1036,11 @@ function getWasmImports() {
     trueModule = null;
 #endif
 #if SHARED_MEMORY || RELOCATABLE
-    receiveInstance(result['instance'], result['module']);
+    return receiveInstance(result['instance'], result['module']);
 #else
     // TODO: Due to Closure regression https://github.com/google/closure-compiler/issues/3193, the above line no longer optimizes out down to the following line.
     // When the regression is fixed, can restore the above PTHREADS-enabled path.
-    receiveInstance(result['instance']);
+    return receiveInstance(result['instance']);
 #endif
   }
 #endif // WASM_ASYNC_COMPILATION
@@ -1076,8 +1076,7 @@ function getWasmImports() {
         // Instantiate from the module posted from the main thread.
         // We can just use sync instantiation in the worker.
         var instance = new WebAssembly.Instance(module, getWasmImports());
-        receiveInstance(instance, module);
-        resolve();
+        resolve(receiveInstance(instance, module));
       };
     });
   }
@@ -1095,16 +1094,16 @@ function getWasmImports() {
   try {
 #endif
     var result = await instantiateAsync(wasmBinary, wasmBinaryFile, info);
-    receiveInstantiationResult(result);
+    var exports = receiveInstantiationResult(result);
 #if LOAD_SOURCE_MAP
     receiveSourceMapJSON(await getSourceMapAsync());
 #endif
-    return result;
+    return exports;
 #if MODULARIZE
   } catch (e) {
     // If instantiation fails, reject the module ready promise.
     readyPromiseReject(e);
-    return;
+    return Promise.reject(e);
   }
 #endif
 #else // WASM_ASYNC_COMPILATION
diff --git a/test/code_size/hello_webgl2_wasm.json b/test/code_size/hello_webgl2_wasm.json
@@ -1,10 +1,10 @@
 {
   "a.html": 454,
   "a.html.gz": 328,
-  "a.js": 4532,
-  "a.js.gz": 2315,
+  "a.js": 4538,
+  "a.js.gz": 2320,
   "a.wasm": 10402,
   "a.wasm.gz": 6703,
-  "total": 15388,
-  "total_gz": 9346
+  "total": 15394,
+  "total_gz": 9351
 }
diff --git a/test/code_size/hello_webgl2_wasm2js.json b/test/code_size/hello_webgl2_wasm2js.json
@@ -1,8 +1,8 @@
 {
   "a.html": 346,
   "a.html.gz": 262,
-  "a.js": 22200,
-  "a.js.gz": 11583,
-  "total": 22546,
-  "total_gz": 11845
+  "a.js": 22206,
+  "a.js.gz": 11589,
+  "total": 22552,
+  "total_gz": 11851
 }
diff --git a/test/code_size/hello_webgl_wasm.json b/test/code_size/hello_webgl_wasm.json
@@ -1,10 +1,10 @@
 {
   "a.html": 454,
   "a.html.gz": 328,
-  "a.js": 4070,
-  "a.js.gz": 2158,
+  "a.js": 4076,
+  "a.js.gz": 2163,
   "a.wasm": 10402,
   "a.wasm.gz": 6703,
-  "total": 14926,
-  "total_gz": 9189
+  "total": 14932,
+  "total_gz": 9194
 }
diff --git a/test/code_size/hello_webgl_wasm2js.json b/test/code_size/hello_webgl_wasm2js.json
@@ -1,8 +1,8 @@
 {
   "a.html": 346,
   "a.html.gz": 262,
-  "a.js": 21726,
-  "a.js.gz": 11413,
-  "total": 22072,
-  "total_gz": 11675
+  "a.js": 21732,
+  "a.js.gz": 11419,
+  "total": 22078,
+  "total_gz": 11681
 }
diff --git a/test/other/codesize/test_codesize_cxx_ctors1.gzsize b/test/other/codesize/test_codesize_cxx_ctors1.gzsize
@@ -1 +1 @@
-8539
+8534
diff --git a/test/other/codesize/test_codesize_cxx_ctors1.jssize b/test/other/codesize/test_codesize_cxx_ctors1.jssize
@@ -1 +1 @@
-20918
+20914
diff --git a/test/other/codesize/test_codesize_cxx_ctors2.gzsize b/test/other/codesize/test_codesize_cxx_ctors2.gzsize
@@ -1 +1 @@
-8523
+8520
diff --git a/test/other/codesize/test_codesize_cxx_ctors2.jssize b/test/other/codesize/test_codesize_cxx_ctors2.jssize
@@ -1 +1 @@
-20886
+20882
diff --git a/test/other/codesize/test_codesize_cxx_except.gzsize b/test/other/codesize/test_codesize_cxx_except.gzsize
@@ -1 +1 @@
-9568
+9566
diff --git a/test/other/codesize/test_codesize_cxx_except.jssize b/test/other/codesize/test_codesize_cxx_except.jssize
@@ -1 +1 @@
-24764
+24760
diff --git a/test/other/codesize/test_codesize_cxx_except_wasm.gzsize b/test/other/codesize/test_codesize_cxx_except_wasm.gzsize
@@ -1 +1 @@
-8500
+8498
diff --git a/test/other/codesize/test_codesize_cxx_except_wasm.jssize b/test/other/codesize/test_codesize_cxx_except_wasm.jssize
@@ -1 +1 @@
-20813
+20809
diff --git a/test/other/codesize/test_codesize_cxx_except_wasm_exnref.gzsize b/test/other/codesize/test_codesize_cxx_except_wasm_exnref.gzsize
@@ -1 +1 @@
-8500
+8498
diff --git a/test/other/codesize/test_codesize_cxx_except_wasm_exnref.jssize b/test/other/codesize/test_codesize_cxx_except_wasm_exnref.jssize
@@ -1 +1 @@
-20813
+20809
diff --git a/test/other/codesize/test_codesize_cxx_lto.gzsize b/test/other/codesize/test_codesize_cxx_lto.gzsize
@@ -1 +1 @@
-8437
+8435
diff --git a/test/other/codesize/test_codesize_cxx_lto.jssize b/test/other/codesize/test_codesize_cxx_lto.jssize
@@ -1 +1 @@
-20498
+20494
diff --git a/test/other/codesize/test_codesize_cxx_mangle.gzsize b/test/other/codesize/test_codesize_cxx_mangle.gzsize
@@ -1 +1 @@
-9571
+9569
diff --git a/test/other/codesize/test_codesize_cxx_mangle.jssize b/test/other/codesize/test_codesize_cxx_mangle.jssize
@@ -1 +1 @@
-24764
+24760
diff --git a/test/other/codesize/test_codesize_cxx_noexcept.gzsize b/test/other/codesize/test_codesize_cxx_noexcept.gzsize
@@ -1 +1 @@
-8539
+8534
diff --git a/test/other/codesize/test_codesize_cxx_noexcept.jssize b/test/other/codesize/test_codesize_cxx_noexcept.jssize
@@ -1 +1 @@
-20918
+20914
diff --git a/test/other/codesize/test_codesize_cxx_wasmfs.gzsize b/test/other/codesize/test_codesize_cxx_wasmfs.gzsize
@@ -1 +1 @@
-3802
+3798
diff --git a/test/other/codesize/test_codesize_cxx_wasmfs.jssize b/test/other/codesize/test_codesize_cxx_wasmfs.jssize
@@ -1 +1 @@
-8562
+8558
diff --git a/test/other/codesize/test_codesize_files_js_fs.gzsize b/test/other/codesize/test_codesize_files_js_fs.gzsize
@@ -1 +1 @@
-7679
+7677
diff --git a/test/other/codesize/test_codesize_files_js_fs.jssize b/test/other/codesize/test_codesize_files_js_fs.jssize
@@ -1 +1 @@
-18826
+18822
diff --git a/test/other/codesize/test_codesize_files_wasmfs.gzsize b/test/other/codesize/test_codesize_files_wasmfs.gzsize
@@ -1 +1 @@
-2897
+2895
diff --git a/test/other/codesize/test_codesize_files_wasmfs.jssize b/test/other/codesize/test_codesize_files_wasmfs.jssize
@@ -1 +1 @@
-6203
+6199
diff --git a/test/other/codesize/test_codesize_hello_O0.gzsize b/test/other/codesize/test_codesize_hello_O0.gzsize
@@ -1 +1 @@
-8017
+8015
diff --git a/test/other/codesize/test_codesize_hello_O0.jssize b/test/other/codesize/test_codesize_hello_O0.jssize
@@ -1 +1 @@
-21521
+21512
diff --git a/test/other/codesize/test_codesize_hello_O1.gzsize b/test/other/codesize/test_codesize_hello_O1.gzsize
@@ -1 +1 @@
-2753
+2750
diff --git a/test/other/codesize/test_codesize_hello_O1.jssize b/test/other/codesize/test_codesize_hello_O1.jssize
@@ -1 +1 @@
-6998
+6986
diff --git a/test/other/codesize/test_codesize_hello_O2.gzsize b/test/other/codesize/test_codesize_hello_O2.gzsize
@@ -1 +1 @@
-2402
+2400
diff --git a/test/other/codesize/test_codesize_hello_O2.jssize b/test/other/codesize/test_codesize_hello_O2.jssize
@@ -1 +1 @@
-4911
+4907
diff --git a/test/other/codesize/test_codesize_hello_O3.gzsize b/test/other/codesize/test_codesize_hello_O3.gzsize
@@ -1 +1 @@
-2312
+2311
diff --git a/test/other/codesize/test_codesize_hello_O3.jssize b/test/other/codesize/test_codesize_hello_O3.jssize
@@ -1 +1 @@
-4758
+4754
diff --git a/test/other/codesize/test_codesize_hello_Os.gzsize b/test/other/codesize/test_codesize_hello_Os.gzsize
@@ -1 +1 @@
-2312
+2311
diff --git a/test/other/codesize/test_codesize_hello_Os.jssize b/test/other/codesize/test_codesize_hello_Os.jssize
@@ -1 +1 @@
-4758
+4754
diff --git a/test/other/codesize/test_codesize_hello_Oz.gzsize b/test/other/codesize/test_codesize_hello_Oz.gzsize
@@ -1 +1 @@
-2295
+2294
diff --git a/test/other/codesize/test_codesize_hello_Oz.jssize b/test/other/codesize/test_codesize_hello_Oz.jssize
@@ -1 +1 @@
-4725
+4721
diff --git a/test/other/codesize/test_codesize_hello_dylink.gzsize b/test/other/codesize/test_codesize_hello_dylink.gzsize
@@ -1 +1 @@
-6191
+6196
diff --git a/test/other/codesize/test_codesize_hello_dylink.jssize b/test/other/codesize/test_codesize_hello_dylink.jssize
@@ -1 +1 @@
-13684
+13701
diff --git a/test/other/codesize/test_codesize_hello_export_nothing.gzsize b/test/other/codesize/test_codesize_hello_export_nothing.gzsize
@@ -1 +1 @@
-1687
+1683
diff --git a/test/other/codesize/test_codesize_hello_export_nothing.jssize b/test/other/codesize/test_codesize_hello_export_nothing.jssize
@@ -1 +1 @@
-3618
+3614
diff --git a/test/other/codesize/test_codesize_hello_wasmfs.gzsize b/test/other/codesize/test_codesize_hello_wasmfs.gzsize
@@ -1 +1 @@
-2312
+2311
diff --git a/test/other/codesize/test_codesize_hello_wasmfs.jssize b/test/other/codesize/test_codesize_hello_wasmfs.jssize
@@ -1 +1 @@
-4758
+4754
diff --git a/test/other/codesize/test_codesize_libcxxabi_message_O3.gzsize b/test/other/codesize/test_codesize_libcxxabi_message_O3.gzsize
@@ -1 +1 @@
-1889
+1887
diff --git a/test/other/codesize/test_codesize_libcxxabi_message_O3.jssize b/test/other/codesize/test_codesize_libcxxabi_message_O3.jssize
@@ -1 +1 @@
-3995
+3991
diff --git a/test/other/codesize/test_codesize_libcxxabi_message_O3_standalone.gzsize b/test/other/codesize/test_codesize_libcxxabi_message_O3_standalone.gzsize
@@ -1 +1 @@
-1928
+1925
diff --git a/test/other/codesize/test_codesize_libcxxabi_message_O3_standalone.jssize b/test/other/codesize/test_codesize_libcxxabi_message_O3_standalone.jssize
@@ -1 +1 @@
-4043
+4039
diff --git a/test/other/codesize/test_codesize_mem_O3.gzsize b/test/other/codesize/test_codesize_mem_O3.gzsize
@@ -1 +1 @@
-2349
+2348
diff --git a/test/other/codesize/test_codesize_mem_O3.jssize b/test/other/codesize/test_codesize_mem_O3.jssize
@@ -1 +1 @@
-4899
+4895
diff --git a/test/other/codesize/test_codesize_mem_O3_grow.gzsize b/test/other/codesize/test_codesize_mem_O3_grow.gzsize
@@ -1 +1 @@
-2497
+2496
diff --git a/test/other/codesize/test_codesize_mem_O3_grow.jssize b/test/other/codesize/test_codesize_mem_O3_grow.jssize
@@ -1 +1 @@
-5184
+5180
diff --git a/test/other/codesize/test_codesize_mem_O3_grow_standalone.gzsize b/test/other/codesize/test_codesize_mem_O3_grow_standalone.gzsize
@@ -1 +1 @@
-2192
+2191
diff --git a/test/other/codesize/test_codesize_mem_O3_grow_standalone.jssize b/test/other/codesize/test_codesize_mem_O3_grow_standalone.jssize
@@ -1 +1 @@
-4592
+4588
diff --git a/test/other/codesize/test_codesize_mem_O3_standalone.gzsize b/test/other/codesize/test_codesize_mem_O3_standalone.gzsize
@@ -1 +1 @@
-2158
+2155
diff --git a/test/other/codesize/test_codesize_mem_O3_standalone.jssize b/test/other/codesize/test_codesize_mem_O3_standalone.jssize
@@ -1 +1 @@
-4522
+4518
diff --git a/test/other/codesize/test_codesize_mem_O3_standalone_lib.gzsize b/test/other/codesize/test_codesize_mem_O3_standalone_lib.gzsize
@@ -1 +1 @@
-1914
+1910
diff --git a/test/other/codesize/test_codesize_mem_O3_standalone_lib.jssize b/test/other/codesize/test_codesize_mem_O3_standalone_lib.jssize
@@ -1 +1 @@
-4042
+4038
diff --git a/test/other/codesize/test_codesize_mem_O3_standalone_narg.gzsize b/test/other/codesize/test_codesize_mem_O3_standalone_narg.gzsize
@@ -1 +1 @@
-1928
+1925
diff --git a/test/other/codesize/test_codesize_mem_O3_standalone_narg.jssize b/test/other/codesize/test_codesize_mem_O3_standalone_narg.jssize
@@ -1 +1 @@
-4043
+4039
diff --git a/test/other/codesize/test_codesize_mem_O3_standalone_narg_flto.gzsize b/test/other/codesize/test_codesize_mem_O3_standalone_narg_flto.gzsize
@@ -1 +1 @@
-1928
+1925
diff --git a/test/other/codesize/test_codesize_mem_O3_standalone_narg_flto.jssize b/test/other/codesize/test_codesize_mem_O3_standalone_narg_flto.jssize
@@ -1 +1 @@
-4043
+4039
diff --git a/test/other/codesize/test_codesize_minimal_64.gzsize b/test/other/codesize/test_codesize_minimal_64.gzsize
@@ -1 +1 @@
-1458
+1461
diff --git a/test/other/codesize/test_codesize_minimal_64.jssize b/test/other/codesize/test_codesize_minimal_64.jssize
@@ -1 +1 @@
-3098
+3092
diff --git a/test/other/codesize/test_codesize_minimal_O1.gzsize b/test/other/codesize/test_codesize_minimal_O1.gzsize
@@ -1 +1 @@
-1536
+1539
diff --git a/test/other/codesize/test_codesize_minimal_O1.jssize b/test/other/codesize/test_codesize_minimal_O1.jssize
@@ -1 +1 @@
-3663
+3652
diff --git a/test/other/codesize/test_codesize_minimal_O2.gzsize b/test/other/codesize/test_codesize_minimal_O2.gzsize
@@ -1 +1 @@
-1389
+1390
diff --git a/test/other/codesize/test_codesize_minimal_O2.jssize b/test/other/codesize/test_codesize_minimal_O2.jssize
@@ -1 +1 @@
-2803
+2797
diff --git a/test/other/codesize/test_codesize_minimal_O3.gzsize b/test/other/codesize/test_codesize_minimal_O3.gzsize
@@ -1 +1 @@
-1354
+1356
diff --git a/test/other/codesize/test_codesize_minimal_O3.jssize b/test/other/codesize/test_codesize_minimal_O3.jssize
@@ -1 +1 @@
-2753
+2747
diff --git a/test/other/codesize/test_codesize_minimal_Os.gzsize b/test/other/codesize/test_codesize_minimal_Os.gzsize
@@ -1 +1 @@
-1354
+1356
diff --git a/test/other/codesize/test_codesize_minimal_Os.jssize b/test/other/codesize/test_codesize_minimal_Os.jssize
@@ -1 +1 @@
-2753
+2747
diff --git a/test/other/codesize/test_codesize_minimal_Oz-ctors.gzsize b/test/other/codesize/test_codesize_minimal_Oz-ctors.gzsize
@@ -1 +1 @@
-1345
+1346
diff --git a/test/other/codesize/test_codesize_minimal_Oz-ctors.jssize b/test/other/codesize/test_codesize_minimal_Oz-ctors.jssize
@@ -1 +1 @@
-2738
+2732
diff --git a/test/other/codesize/test_codesize_minimal_Oz.gzsize b/test/other/codesize/test_codesize_minimal_Oz.gzsize
@@ -1 +1 @@
-1354
+1356
diff --git a/test/other/codesize/test_codesize_minimal_Oz.jssize b/test/other/codesize/test_codesize_minimal_Oz.jssize
@@ -1 +1 @@
-2753
+2747
diff --git a/test/other/codesize/test_codesize_minimal_pthreads.gzsize b/test/other/codesize/test_codesize_minimal_pthreads.gzsize
@@ -1 +1 @@
-4155
+4162
diff --git a/test/other/codesize/test_codesize_minimal_pthreads.jssize b/test/other/codesize/test_codesize_minimal_pthreads.jssize
@@ -1 +1 @@
-8612
+8628
diff --git a/test/other/codesize/test_codesize_minimal_wasmfs.gzsize b/test/other/codesize/test_codesize_minimal_wasmfs.gzsize
@@ -1 +1 @@
-1354
+1356
diff --git a/test/other/codesize/test_codesize_minimal_wasmfs.jssize b/test/other/codesize/test_codesize_minimal_wasmfs.jssize
@@ -1 +1 @@
-2753
+2747
diff --git a/test/other/test_unoptimized_code_size.js.size b/test/other/test_unoptimized_code_size.js.size
@@ -1 +1 @@
-53979
+54001
diff --git a/test/other/test_unoptimized_code_size_no_asserts.js.size b/test/other/test_unoptimized_code_size_no_asserts.js.size
@@ -1 +1 @@
-29399
+29421
diff --git a/test/other/test_unoptimized_code_size_strict.js.size b/test/other/test_unoptimized_code_size_strict.js.size
@@ -1 +1 @@
-52775
+52797
diff --git a/test/test_browser.py b/test/test_browser.py
@@ -4795,28 +4795,19 @@ def test_browser_run_from_different_directory(self):
 
   # Similar to `test_browser_run_from_different_directory`, but asynchronous because of `-sMODULARIZE`
   def test_browser_run_from_different_directory_async(self):
-    for args, creations in [
-      (['-sMODULARIZE'], [
-        'Module();',    # documented way for using modularize
-        'new Module();' # not documented as working, but we support it
-       ]),
-    ]:
-      print(args)
-      # compile the code with the modularize feature and the preload-file option enabled
-      self.compile_btest('browser_test_hello_world.c', ['-o', 'test.js', '-O3'] + args)
-      ensure_dir('subdir')
-      shutil.move('test.js', Path('subdir/test.js'))
-      shutil.move('test.wasm', Path('subdir/test.wasm'))
-      for creation in creations:
-        print(creation)
-        # Make sure JS is loaded from subdirectory
-        create_file('test-subdir.html', '''
-          <script src="subdir/test.js"></script>
-          <script>
-            %s
-          </script>
-        ''' % creation)
-        self.run_browser('test-subdir.html', '/report_result?0')
+    # compile the code with the modularize feature and the preload-file option enabled
+    self.compile_btest('browser_test_hello_world.c', ['-o', 'test.js', '-O3', '-sMODULARIZE'])
+    ensure_dir('subdir')
+    shutil.move('test.js', Path('subdir/test.js'))
+    shutil.move('test.wasm', Path('subdir/test.wasm'))
+    # Make sure JS is loaded from subdirectory
+    create_file('test-subdir.html', '''
+      <script src="subdir/test.js"></script>
+      <script>
+        Module();
+      </script>
+    ''')
+    self.run_browser('test-subdir.html', '/report_result?0')
 
   # Similar to `test_browser_run_from_different_directory`, but
   # also also we eval the initial code, so currentScript is not present. That prevents us
diff --git a/test/test_unicode_js_library.out b/test/test_unicode_js_library.out
@@ -1,2 +1,2 @@
-Unicode postjs: àČšñéáúÍųåêâăščếệüçλληνικάбългарскиPусскийСрпскиУкраїнська한국어中文普通话(中国大陆)普通话(香港)中文(台灣)粵語(香港)日本語हिन्दीภาษาไทย
 Unicode snowman ☃ says hello! àČšñéáúÍųåêâăščếệüçλληνικάбългарскиPусскийСрпскиУкраїнська한국어中文普通话(中国大陆)普通话(香港)中文(台灣)粵語(香港)日本語हिन्दीภาษาไทย
+Unicode postjs: àČšñéáúÍųåêâăščếệüçλληνικάбългарскиPусскийСрпскиУкраїнська한국어中文普通话(中国大陆)普通话(香港)中文(台灣)粵語(香港)日本語हिन्दीภาษาไทย
diff --git a/tools/emscripten.py b/tools/emscripten.py
diff --git a/tools/link.py b/tools/link.py

Original file line number	Diff line number	Diff line change
`@@ -1,8 +1,8 @@`
`1`	`1`	`{`
`2`	`2`	`"a.html": 346,`
`3`	`3`	`"a.html.gz": 262,`
`4`		`- "a.js": 22200,`
`5`		`- "a.js.gz": 11583,`
`6`		`- "total": 22546,`
`7`		`- "total_gz": 11845`
	`4`	`+ "a.js": 22206,`
	`5`	`+ "a.js.gz": 11589,`
	`6`	`+ "total": 22552,`
	`7`	`+ "total_gz": 11851`
`8`	`8`	`}`
Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,2 @@`
`1`		`-Unicode postjs: àČšñéáúÍųåêâăščếệüçλληνικάбългарскиPусскийСрпскиУкраїнська한국어中文普通话(中国大陆)普通话(香港)中文(台灣)粵語(香港)日本語हिन्दीภาษาไทย`
`2`	`1`	`Unicode snowman ☃ says hello! àČšñéáúÍųåêâăščếệüçλληνικάбългарскиPусскийСрпскиУкраїнська한국어中文普通话(中国大陆)普通话(香港)中文(台灣)粵語(香港)日本語हिन्दीภาษาไทย`
	`2`	`+Unicode postjs: àČšñéáúÍųåêâăščếệüçλληνικάбългарскиPусскийСрпскиУкраїнська한국어中文普通话(中国大陆)普通话(香港)中文(台灣)粵語(香港)日本語हिन्दीภาษาไทย`