[vala/wip/attributes: 14/119] codegen: Add get_ccode_ref_sink_function

[Luca Bruno <lucabru src gnome org>]

commit df24dda7677b236556b250001ed8fe5bf09ea1e7
Author: Luca Bruno <lucabru src gnome org>
Date:   Sun Jun 26 16:50:35 2011 +0200

    codegen: Add get_ccode_ref_sink_function

 codegen/valaccodebasemodule.vala |   33 +++++++++++++++++++++++++++++++--
 1 files changed, 31 insertions(+), 2 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index 825a451..3a070d2 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -5059,9 +5059,9 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 			/* floating reference, sink it.
 			 */
 			var cl = type.data_type as ObjectTypeSymbol;
-			var sink_func = (cl != null) ? cl.get_ref_sink_function () : null;
+			var sink_func = (cl != null) ? get_ccode_ref_sink_function (cl) : "";
 
-			if (sink_func != null) {
+			if (sink_func != "") {
 				var csink = new CCodeFunctionCall (new CCodeIdentifier (sink_func));
 				csink.add_argument (result.cvalue);
 				
@@ -5634,6 +5634,10 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 		return get_ccode_attribute(sym).unref_function;
 	}
 
+	public static string get_ccode_ref_sink_function (ObjectTypeSymbol sym) {
+		return get_ccode_attribute(sym).ref_sink_function;
+	}
+
 	public override void visit_class (Class cl) {
 	}
 
@@ -6083,6 +6087,15 @@ public class Vala.CCodeAttribute : AttributeCache {
 		}
 	}
 
+	public string ref_sink_function {
+		get {
+			if (_ref_sink_function == null) {
+				_ref_sink_function = get_default_ref_sink_function ();
+			}
+			return _ref_sink_function;
+		}
+	}
+
 	private string _name;
 	private string _const_name;
 	private string _type_name;
@@ -6093,6 +6106,7 @@ public class Vala.CCodeAttribute : AttributeCache {
 	private string _ref_function;
 	private bool? _ref_function_void;
 	private string _unref_function;
+	private string _ref_sink_function;
 
 	public CCodeAttribute (CodeNode node) {
 		this.node = node;
@@ -6121,6 +6135,7 @@ public class Vala.CCodeAttribute : AttributeCache {
 				_ref_function_void = attr.get_bool ("ref_function_void");
 			}
 			_unref_function = attr.get_string ("unref_function");
+			_ref_sink_function = attr.get_string ("ref_sink_function");
 		}
 	}
 
@@ -6359,4 +6374,18 @@ public class Vala.CCodeAttribute : AttributeCache {
 		}
 		return "";
 	}
+
+	private string get_default_ref_sink_function () {
+		if (sym is Class) {
+			return CCodeBaseModule.get_ccode_ref_sink_function (((Class) sym).base_class);
+		} else if (sym is Interface) {
+			foreach (var prereq in ((Interface) sym).get_prerequisites ()) {
+				string ref_sink_func = CCodeBaseModule.get_ccode_ref_sink_function ((ObjectTypeSymbol) prereq.data_type);
+				if (ref_sink_func != "") {
+					return ref_sink_func;
+				}
+			}
+		}
+		return "";
+	}
 }