[vala/staging: 6/9] codegen: Add type declaration for method errors and error domains as needed

[Rico Tzschichholz <ricotz src gnome org>]

commit 5ba5d8edb22565195ab6f78b79a7bad30cfa6f0d
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Nov 21 15:33:24 2018 +0100

    codegen: Add type declaration for method errors and error domains as needed

 codegen/valaccodebasemodule.vala | 5 +++++
 codegen/valagerrormodule.vala    | 2 ++
 2 files changed, 7 insertions(+)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index aabcd9b93..e197b1c60 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -325,6 +325,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
        public DataType delegate_target_type;
        public DelegateType delegate_target_destroy_type;
        Delegate destroy_notify;
+       Class gerror;
 
        public bool in_plugin = false;
        public string module_init_param_name;
@@ -475,6 +476,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
                        gthreadpool_type = (TypeSymbol) glib_ns.scope.lookup ("ThreadPool");
                        gdestroynotify_type = new DelegateType ((Delegate) glib_ns.scope.lookup 
("DestroyNotify"));
 
+                       gerror = (Class) root_symbol.scope.lookup ("GLib").scope.lookup ("Error");
                        gquark_type = new IntegerType ((Struct) glib_ns.scope.lookup ("Quark"));
                        gvalue_type = (Struct) glib_ns.scope.lookup ("Value");
                        gvariant_type = (Class) glib_ns.scope.lookup ("Variant");
@@ -1522,6 +1524,9 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
                        if (method.has_type_parameters () && !get_ccode_simple_generics (method)) {
                                generate_struct_declaration ((Struct) gtype_type, decl_space);
                        }
+                       if (method.has_error_type_parameter ()) {
+                               generate_class_declaration (gerror, decl_space);
+                       }
                }
 
                foreach (DataType type_arg in type.get_type_arguments ()) {
diff --git a/codegen/valagerrormodule.vala b/codegen/valagerrormodule.vala
index a0cefb9d1..d29d09ca1 100644
--- a/codegen/valagerrormodule.vala
+++ b/codegen/valagerrormodule.vala
@@ -33,6 +33,8 @@ public class Vala.GErrorModule : CCodeDelegateModule {
                        return;
                }
 
+               generate_type_declaration (gquark_type, decl_space);
+
                var cenum = new CCodeEnum (get_ccode_name (edomain));
 
                foreach (ErrorCode ecode in edomain.get_codes ()) {