codegen: Handle non-default AsyncResult parameter position

Unfortunately gdbus-codegen puts the AsyncResult parameter after possible
out-parameters therefore there is an "async_result_pos" attribute required
to handle this correctly.

Vala supposely follows the common practice to put the AsyncResult before
out-parameters by default.

Fixes https://gitlab.gnome.org/GNOME/vala/issues/709

1 files changed, 56 insertions, 0 deletions

diff --git a/tests/gir/async-result-pos.test b/tests/gir/async-result-pos.test
new file mode 100644
index 000000000..2a17f53dc
--- /dev/null
+++ b/tests/gir/async-result-pos.test
@@ -0,0 +1,56 @@
+GIR
+
+Input:
+
+<class name="Foo" c:type="TestFoo" glib:type-name="TestFoo" glib:get-type="test_foo_get_type" glib:type-struct="FooClass" parent="GObject.Object">
+  <method name="method_async" c:identifier="test_foo_method_async">
+    <return-value transfer-ownership="none">
+      <type name="none"/>
+    </return-value>
+    <parameters>
+      <instance-parameter name="self" transfer-ownership="none">
+        <type name="Foo" c:type="TestFoo*"/>
+      </instance-parameter>
+      <parameter name="input" transfer-ownership="none">
+        <type name="utf8" c:type="const gchar*"/>
+      </parameter>
+      <parameter name="_callback_" transfer-ownership="none" allow-none="1" closure="2" scope="async">
+        <type name="Gio.AsyncReadyCallback" c:type="GAsyncReadyCallback"/>
+      </parameter>
+      <parameter name="_callback__target" transfer-ownership="none" allow-none="1">
+        <type name="gpointer" c:type="void*"/>
+      </parameter>
+    </parameters>
+  </method>
+  <method name="method_finish" c:identifier="test_foo_method_finish" throws="1">
+    <return-value transfer-ownership="full">
+      <type name="none"/>
+    </return-value>
+    <parameters>
+      <instance-parameter name="self" transfer-ownership="none">
+        <type name="Foo" c:type="TestFoo*"/>
+      </instance-parameter>
+      <parameter name="output" direction="out" transfer-ownership="full">
+        <type name="utf8" c:type="gchar**"/>
+      </parameter>
+      <parameter name="_res_" transfer-ownership="none">
+        <type name="Gio.AsyncResult" c:type="GAsyncResult*"/>
+      </parameter>
+    </parameters>
+  </method>
+  <constructor name="new" c:identifier="test_foo_new">
+    <return-value transfer-ownership="full">
+      <type name="Test.Foo" c:type="TestFoo*"/>
+    </return-value>
+  </constructor>
+</class>
+
+Output:
+
+[CCode (cheader_filename = "test.h", type_id = "test_foo_get_type ()")]
+public class Foo : GLib.Object {
+	[CCode (has_construct_function = false)]
+	public Foo ();
+	[CCode (async_result_pos = 2.1)]
+	public async void method_async (string input, out string output) throws GLib.Error;
+}