fix late bound methods and signals, fixes bug 476953

2007-09-14  Juerg Billeter  <j@bitron.ch>

	* gobject/valacodegeneratorinvocationexpression.vala,
	  gobject/valacodegeneratorsignal.vala: fix late bound methods and
	  signals, fixes bug 476953

svn path=/trunk/; revision=603

3 files changed, 20 insertions, 8 deletions

diff --git a/ChangeLog b/ChangeLog
index b9bead32a..c1b7ed1e5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2007-09-14  Jürg Billeter  <j@bitron.ch>
+
+	* gobject/valacodegeneratorinvocationexpression.vala,
+	  gobject/valacodegeneratorsignal.vala: fix late bound methods and
+	  signals, fixes bug 476953
+
 2007-09-13  Jürg Billeter  <j@bitron.ch>
 
 	* gobject/valacodegeneratormethod.vala: generate C code comment for
diff --git a/gobject/valacodegeneratorinvocationexpression.vala b/gobject/valacodegeneratorinvocationexpression.vala
index cc8ce06fc..77e309e1d 100644
--- a/gobject/valacodegeneratorinvocationexpression.vala
+++ b/gobject/valacodegeneratorinvocationexpression.vala
@@ -83,9 +83,12 @@ public class Vala.CodeGenerator {
 				instance = new CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, instance);
 			}
 
-			var instance_target_type = new TypeReference ();
-			instance_target_type.data_type = (DataType) base_method.parent_symbol;
-			instance = get_implicit_cast_expression (instance, instance_expression_type, instance_target_type);
+			// parent_symbol may be null for late bound methods
+			if (base_method.parent_symbol != null) {
+				var instance_target_type = new TypeReference ();
+				instance_target_type.data_type = (DataType) base_method.parent_symbol;
+				instance = get_implicit_cast_expression (instance, instance_expression_type, instance_target_type);
+			}
 
 			if (!m.instance_last) {
 				ccall.add_argument (instance);
diff --git a/gobject/valacodegeneratorsignal.vala b/gobject/valacodegeneratorsignal.vala
index 9c320f9c5..f446f94c2 100644
--- a/gobject/valacodegeneratorsignal.vala
+++ b/gobject/valacodegeneratorsignal.vala
@@ -105,11 +105,14 @@ public class Vala.CodeGenerator {
 	}
 	
 	public override void visit_signal (Signal! sig) {
-		var dt = sig.parent_symbol as DataType;
-		if (!dt.is_subtype_of (gobject_type)) {
-			sig.error = true;
-			Report.error (sig.source_reference, "Only classes and interfaces deriving from GLib.Object support signals. `%s' does not derive from GLib.Object.".printf (dt.get_full_name ()));
-			return;
+		// parent_symbol may be null for late bound signals
+		if (sig.parent_symbol != null) {
+			var dt = sig.parent_symbol as DataType;
+			if (!dt.is_subtype_of (gobject_type)) {
+				sig.error = true;
+				Report.error (sig.source_reference, "Only classes and interfaces deriving from GLib.Object support signals. `%s' does not derive from GLib.Object.".printf (dt.get_full_name ()));
+				return;
+			}
 		}
 
 		sig.accept_children (this);