Wasm: Compile as reactor module

Author: simolus3

.github/workflows/main.yml

@@ -176,7 +176,7 @@ jobs:
 
     - name: Web tests
       run: |
-        curl https://storage.googleapis.com/simon-public-euw3/assets/sqlite3/wasm/2.4.3/sqlite3.wasm -o example/web/sqlite3.wasm
+        curl https://storage.googleapis.com/simon-public-euw3/assets/sqlite3/wasm/2.4.6/sqlite3.wasm -o example/web/sqlite3.wasm
         dart test -P web -r expanded
       # If browsers behave differently on different platforms, surely that's not our fault...
       # So, only run browser tests on Linux to be faster.

sqlite3/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.4.6
+
+- WebAssembly: Call `_initialize` function of sqlite3 module if one is present.
+
 ## 2.4.5
 
 - Fix a bug in the OPFS-locks implementation causing a deadlock when the `xSleep`

sqlite3/assets/wasm/CMakeLists.txt

@@ -32,7 +32,8 @@ macro(base_sqlite3_target name)
         helpers.c
     )
 
-    target_link_options(${name} PRIVATE -nostartfiles -Wl,--import-memory -Wl,--no-entry -Wl,--export-dynamic)
+    target_link_options(${name} PRIVATE -mexec-model=reactor -mcpu=generic -Wl,--import-memory -Wl,--no-entry -Wl,--export-dynamic)
+    target_compile_options(${name} PRIVATE -std=c23 -mcpu=generic)
     target_include_directories(${name} PRIVATE "${PROJECT_SOURCE_DIR}/")
     target_include_directories(${name} PRIVATE ${sqlite3_SOURCE_DIR})
     target_compile_definitions(${name} PRIVATE

sqlite3/lib/src/wasm/js_interop/wasm.dart

@@ -54,6 +54,14 @@ class WasmInstance {
     });
 
     final native = await _instantiateStreaming(response, importsJs).toDart;
+
+    // If the module has an `_initialize` export, it needs to be called to run
+    // C constructors and set up memory.
+    final exports = native.instance.exports;
+    if (exports.has('_initialize')) {
+      (exports['_initialize'] as JSFunction).callAsFunction();
+    }
+
     return WasmInstance._(native.instance);
   }
 }

sqlite3/pubspec.yaml

@@ -1,6 +1,6 @@
 name: sqlite3
 description: Provides lightweight yet convenient bindings to SQLite by using dart:ffi
-version: 2.4.5
+version: 2.4.6-dev
 homepage: https://github.com/simolus3/sqlite3.dart/tree/main/sqlite3
 issue_tracker: https://github.com/simolus3/sqlite3.dart/issues