[vala] codegen: Set closure pointers to NULL after unref

[Jürg Billeter <juergbi src gnome org>]

commit 344211b16fadbb6957dddd2c3d42b9714e3d91eb
Author: Jürg Billeter <j bitron ch>
Date:   Thu Jan 20 14:36:18 2011 +0100

    codegen: Set closure pointers to NULL after unref

 codegen/valaccodebasemodule.vala |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index 5fff89e..14258bc 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -1745,6 +1745,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 				var unref_call = new CCodeFunctionCall (new CCodeIdentifier ("block%d_data_unref".printf (parent_block_id)));
 				unref_call.add_argument (new CCodeMemberAccess.pointer (new CCodeIdentifier ("_data%d_".printf (block_id)), "_data%d_".printf (parent_block_id)));
 				free_block.add_statement (new CCodeExpressionStatement (unref_call));
+				free_block.add_statement (new CCodeExpressionStatement (new CCodeAssignment (new CCodeMemberAccess.pointer (new CCodeIdentifier ("_data%d_".printf (block_id)), "_data%d_".printf (parent_block_id)), new CCodeConstant ("NULL"))));
 			} else {
 				if (in_constructor || (current_method != null && current_method.binding == MemberBinding.INSTANCE) ||
 				           (current_property_accessor != null && current_property_accessor.prop.binding == MemberBinding.INSTANCE)) {
@@ -1949,6 +1950,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 			var data_unref = new CCodeFunctionCall (new CCodeIdentifier ("block%d_data_unref".printf (block_id)));
 			data_unref.add_argument (get_variable_cexpression ("_data%d_".printf (block_id)));
 			ccode.add_expression (data_unref);
+			ccode.add_assignment (get_variable_cexpression ("_data%d_".printf (block_id)), new CCodeConstant ("NULL"));
 		}
 
 		if (b.parent_node is Block || b.parent_node is SwitchStatement) {
@@ -3087,6 +3089,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 			var data_unref = new CCodeFunctionCall (new CCodeIdentifier ("block%d_data_unref".printf (block_id)));
 			data_unref.add_argument (get_variable_cexpression ("_data%d_".printf (block_id)));
 			ccode.add_expression (data_unref);
+			ccode.add_assignment (get_variable_cexpression ("_data%d_".printf (block_id)), new CCodeConstant ("NULL"));
 		}
 
 		if (stop_at_loop) {