Introduced dylib extension format, cleared up shutdown sequence

orchid-extension/src/binary.rs

@@ -9,7 +9,7 @@ use crate::ext_port::ExtPort;
 
 pub type ExtCx = api::binary::ExtensionContext;
 
-struct Spawner(api::binary::Spawner);
+struct Spawner(api::binary::SpawnerBin);
 impl Drop for Spawner {
 	fn drop(&mut self) { (self.0.drop)(self.0.data) }
 }
@@ -28,3 +28,22 @@ pub fn orchid_extension_main_body(cx: ExtCx, builder: ExtensionBuilder) {
 		spawn: Rc::new(move |fut| spawner.spawn(fut)),
 	});
 }
+
+/// Generate entrypoint for the dylib extension loader
+///
+/// # Usage
+///
+/// ```
+/// dylib_main! {
+///   ExtensionBuilder::new("orchid-std::main")
+/// }
+/// ```
+#[macro_export]
+macro_rules! dylib_main {
+	($builder:expr) => {
+		#[unsafe(no_mangle)]
+		pub extern "C" fn orchid_extension_main(cx: ::orchid_api::binary::ExtensionContext) {
+			$crate::binary::orchid_extension_main_body(cx, $builder);
+		}
+	};
+}