From 88120158ad895877cb81f90228aab5fbbf80a632 Mon Sep 17 00:00:00 2001
From: Sam Clegg <sbc@chromium.org>
Date: Wed, 26 Nov 2025 14:45:52 -0800
Subject: [PATCH] Use asyncify-export-globals when building main modules. NFC

Depends on https://github.com/WebAssembly/binaryen/pull/8074
---
 src/lib/libcore.js          |  5 -----
 tools/emscripten.py         |  7 ++++---
 tools/link.py               | 11 +++--------
 tools/maint/gen_sig_info.py |  1 -
 4 files changed, 7 insertions(+), 17 deletions(-)

diff --git a/src/lib/libcore.js b/src/lib/libcore.js
index f3b042033f3ca..d774ed139d044 100644
--- a/src/lib/libcore.js
+++ b/src/lib/libcore.js
@@ -2212,11 +2212,6 @@ addToLibrary({
   __global_base: '{{{ GLOBAL_BASE }}}',
 #endif // RELOCATABLE
 
-#if (MAIN_MODULE || RELOCATABLE) && ASYNCIFY == 1
-  __asyncify_state: "new WebAssembly.Global({'value': 'i32', 'mutable': true}, 0)",
-  __asyncify_data: "new WebAssembly.Global({'value': '{{{ POINTER_WASM_TYPE }}}', 'mutable': true}, {{{ to64(0) }}})",
-#endif
-
   _emscripten_fs_load_embedded_files__deps: ['$FS', '$PATH'],
   _emscripten_fs_load_embedded_files: (ptr) => {
 #if RUNTIME_DEBUG
diff --git a/tools/emscripten.py b/tools/emscripten.py
index 97235d59f3e7f..efe0cc1150c59 100644
--- a/tools/emscripten.py
+++ b/tools/emscripten.py
@@ -114,6 +114,10 @@ def update_settings_glue(wasm_file, metadata, base_metadata):
     settings.WASM_EXPORTS = metadata.all_exports
   settings.HAVE_EM_ASM = bool(settings.MAIN_MODULE or len(metadata.em_asm_consts) != 0)
 
+  if settings.MAIN_MODULE:
+    # These will be exported from Wasm, but only once we run the asyncify pass.
+    settings.WASM_EXPORTS += ['__asyncify_state', '__asyncify_data']
+
   # start with the MVP features, and add any detected features.
   building.binaryen_features = ['--mvp-features'] + metadata.features
   if settings.ASYNCIFY == 2:
@@ -351,9 +355,6 @@ def emscript(in_wasm, out_wasm, outfile_js, js_syms, finalize=True, base_metadat
     if settings.INITIAL_TABLE == -1:
       settings.INITIAL_TABLE = dylink_sec.table_size + 1
 
-  if settings.MAIN_MODULE and settings.ASYNCIFY == 1:
-    metadata.imports += ['__asyncify_state', '__asyncify_data']
-
   if metadata.invoke_funcs:
     settings.DEFAULT_LIBRARY_FUNCS_TO_INCLUDE += ['$getWasmTableEntry']
 
diff --git a/tools/link.py b/tools/link.py
index 18f7d7cad912e..b649d90413ecf 100644
--- a/tools/link.py
+++ b/tools/link.py
@@ -431,7 +431,9 @@ def get_binaryen_passes(options):
     passes += ['--fpcast-emu']
   if settings.ASYNCIFY == 1:
     passes += ['--asyncify']
-    if settings.RELOCATABLE or settings.MAIN_MODULE:
+    if settings.MAIN_MODULE:
+      passes += ['--pass-arg=asyncify-export-globals']
+    elif settings.RELOCATABLE:
       passes += ['--pass-arg=asyncify-relocatable']
     if settings.ASSERTIONS:
       passes += ['--pass-arg=asyncify-asserts']
@@ -1331,13 +1333,6 @@ def limit_incoming_module_api():
       '$relocateExports',
       '$GOTHandler',
     ]
-
-    if settings.ASYNCIFY == 1:
-      settings.DEFAULT_LIBRARY_FUNCS_TO_INCLUDE += [
-        '__asyncify_state',
-        '__asyncify_data',
-      ]
-
     # shared modules need memory utilities to allocate their memory
     settings.ALLOW_TABLE_GROWTH = 1
 
diff --git a/tools/maint/gen_sig_info.py b/tools/maint/gen_sig_info.py
index 534f6d2e9d9e7..b1ff53a95d3d3 100755
--- a/tools/maint/gen_sig_info.py
+++ b/tools/maint/gen_sig_info.py
@@ -179,7 +179,6 @@ def ignore_symbol(s, cxx):
     return True
   if s in {'__stack_base', '__memory_base', '__table_base', '__global_base', '__heap_base',
            '__stack_pointer', '__stack_high', '__stack_low', '_load_secondary_module',
-           '__asyncify_state', '__asyncify_data',
            # legacy aliases, not callable from native code.
            'stackSave', 'stackRestore', 'stackAlloc', 'getTempRet0', 'setTempRet0',
            }: