[vala/0.48] codegen: Emit G_DEFINE_AUTOPTR_CLEANUP_FUNC() for interfaces with base class

[Rico Tzschichholz <ricotz src gnome org>]

commit 97d25a2e02fa655d05b6a4bf365b51c1c41ca444
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Feb 24 13:45:18 2022 +0100

    codegen: Emit G_DEFINE_AUTOPTR_CLEANUP_FUNC() for interfaces with base class
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/1292

 codegen/valagtypemodule.vala | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
---
diff --git a/codegen/valagtypemodule.vala b/codegen/valagtypemodule.vala
index 8dab871b7..99c263ce6 100644
--- a/codegen/valagtypemodule.vala
+++ b/codegen/valagtypemodule.vala
@@ -2090,8 +2090,9 @@ public class Vala.GTypeModule : GErrorModule {
                decl_space.add_type_declaration (new CCodeTypeDefinition ("struct _%s".printf (get_ccode_name 
(iface)), new CCodeVariableDeclarator (get_ccode_name (iface))));
                decl_space.add_type_declaration (new CCodeTypeDefinition ("struct %s".printf 
(type_struct.name), new CCodeVariableDeclarator (get_ccode_type_name (iface))));
 
+               unowned Class? prereq_cl = null;
                foreach (DataType prerequisite in iface.get_prerequisites ()) {
-                       unowned Class? prereq_cl = prerequisite.type_symbol as Class;
+                       prereq_cl = prerequisite.type_symbol as Class;
                        unowned Interface? prereq_iface = prerequisite.type_symbol as Interface;
                        if (prereq_cl != null) {
                                generate_class_declaration (prereq_cl, decl_space);
@@ -2156,6 +2157,16 @@ public class Vala.GTypeModule : GErrorModule {
                var type_fun = new InterfaceRegisterFunction (iface);
                type_fun.init_from_type (context, in_plugin, true);
                decl_space.add_type_member_declaration (type_fun.get_declaration ());
+
+               if (prereq_cl != null) {
+                       var base_class = prereq_cl;
+                       while (base_class.base_class != null) {
+                               base_class = base_class.base_class;
+                       }
+                       // Custom unref-methods need to be emitted before G_DEFINE_AUTOPTR_CLEANUP_FUNC,
+                       // so we guard against that special case and handle it in generate_method_declaration.
+                       generate_autoptr_cleanup (iface, base_class, decl_space);
+               }
        }
 
        public override void visit_interface (Interface iface) {