[tsgen] Remove asyncify function exports assertions. (#25899)

When using `tsgen` with `-sASYNCIFY=1` and assertions enabled, an
assertion failure occurs: `Assertion failed: missing Wasm export:
asyncify_start_unwind`. This is due to
#25541.

This PR disables assertions for the `_asyncify_<x>` exports when running
`tsgen` to resolve the issue.

Continuation of #25780

---------

Co-authored-by: stephenduong1004 <stephenduong@google.com>
Co-authored-by: Alon Zakai <alonzakai@gmail.com>

Author: 3 people

test/test_other.py

@@ -3554,49 +3554,42 @@ def test_embind_tsgen_end_to_end(self, opts, tsc_opts):
 
   @is_slow_test
   @requires_dev_dependency('typescript')
-  def test_embind_tsgen_ignore(self):
+  # These extra arguments are not related to TS binding generation but we want to
+  # verify that they do not interfere with it.
+  @parameterized({
+    '1': [['-sALLOW_MEMORY_GROWTH=1',
+           '-Wno-pthreads-mem-growth',
+           '-sMAXIMUM_MEMORY=4GB',
+           '--pre-js', 'fail.js',
+           '--post-js', 'fail.js',
+           '--extern-pre-js', 'fail.js',
+           '--extern-post-js', 'fail.js',
+           '-sENVIRONMENT=worker',
+           '--use-preload-cache',
+           '--preload-file', 'fail.js',
+           '-O3',
+           '-msimd128',
+           '-pthread',
+           '-sPROXY_TO_PTHREAD',
+           '-sPTHREAD_POOL_SIZE=1',
+           '-sSINGLE_FILE',
+           '-lembind', # Test duplicated link option.
+          ], 'embind_tsgen_ignore_1.d.ts'],
+    '2': [['--embed-file', 'fail.js',
+           '-sMINIMAL_RUNTIME=2',
+           '-sEXPORT_ES6=1',
+           '-sASSERTIONS=0',
+           '-sSTRICT=1',
+          ], 'embind_tsgen_ignore_2.d.ts'],
+    '3': [['-sWASM=0'], 'embind_tsgen_ignore_3.d.ts'],
+    '4': [['-fsanitize=undefined', '-gsource-map'], 'embind_tsgen_ignore_3.d.ts'],
+    '5': [['-sASYNCIFY'], 'embind_tsgen_ignore_3.d.ts'],
+  })
+  def test_embind_tsgen_ignore(self, extra_args, expected_ts_file):
     create_file('fail.js', 'assert(false);')
     self.cflags += ['-lembind', '--emit-tsd', 'embind_tsgen.d.ts']
-    # These extra arguments are not related to TS binding generation but we want to
-    # verify that they do not interfere with it.
-    extra_args = ['-sALLOW_MEMORY_GROWTH=1',
-                  '-Wno-pthreads-mem-growth',
-                  '-sMAXIMUM_MEMORY=4GB',
-                  '--pre-js', 'fail.js',
-                  '--post-js', 'fail.js',
-                  '--extern-pre-js', 'fail.js',
-                  '--extern-post-js', 'fail.js',
-                  '-sENVIRONMENT=worker',
-                  '--use-preload-cache',
-                  '--preload-file', 'fail.js',
-                  '-O3',
-                  '-msimd128',
-                  '-pthread',
-                  '-sPROXY_TO_PTHREAD',
-                  '-sPTHREAD_POOL_SIZE=1',
-                  '-sSINGLE_FILE',
-                  '-lembind', # Test duplicated link option.
-                  ]
     self.emcc('other/embind_tsgen.cpp', extra_args)
-    self.assertFileContents(test_file('other/embind_tsgen_ignore_1.d.ts'), read_file('embind_tsgen.d.ts'))
-    # Test these args separately since they conflict with arguments in the first test.
-    extra_args = ['-sMODULARIZE',
-                  '--embed-file', 'fail.js',
-                  '-sMINIMAL_RUNTIME=2',
-                  '-sEXPORT_ES6=1',
-                  '-sASSERTIONS=0',
-                  '-sSTRICT=1']
-    self.emcc('other/embind_tsgen.cpp', extra_args)
-    self.assertFileContents(test_file('other/embind_tsgen_ignore_2.d.ts'), read_file('embind_tsgen.d.ts'))
-    # Also test this separately since it conflicts with other settings.
-    extra_args = ['-sWASM=0']
-    self.emcc('other/embind_tsgen.cpp', extra_args)
-    self.assertFileContents(test_file('other/embind_tsgen_ignore_3.d.ts'), read_file('embind_tsgen.d.ts'))
-
-    extra_args = ['-fsanitize=undefined',
-                  '-gsource-map']
-    self.emcc('other/embind_tsgen.cpp', extra_args)
-    self.assertFileContents(test_file('other/embind_tsgen_ignore_3.d.ts'), read_file('embind_tsgen.d.ts'))
+    self.assertFileContents(test_file(f'other/{expected_ts_file}'), read_file('embind_tsgen.d.ts'))
 
   def test_embind_tsgen_worker_env(self):
     self.cflags += ['-lembind', '--emit-tsd', 'embind_tsgen.d.ts']

tools/emscripten.py

@@ -962,6 +962,10 @@ def create_receiving(function_exports, other_exports, library_symbols, aliases):
   receiving.append('\nfunction assignWasmExports(wasmExports) {')
   if settings.ASSERTIONS:
     for sym in exports:
+      if settings.EMBIND_GEN_MODE and sym.startswith('asyncify_'):
+        # EMBIND_GEN_MODE is run before binaryen so the asyncify exports that
+        # are created by binaryen will be missing.
+        continue
       receiving.append(f"  assert(typeof wasmExports['{sym}'] != 'undefined', 'missing Wasm export: {sym}');")
   for sym, info in exports.items():
     is_function = type(info) == webassembly.FuncType