[vala] codegen: Clarify handling of self for closures

[Jürg Billeter <juergbi src gnome org>]

commit b77de85b992e66eacbea8ca4c8ab30b18f8f598c
Author: Jürg Billeter <j bitron ch>
Date:   Wed Jun 1 15:47:29 2011 +0200

    codegen: Clarify handling of self for closures

 codegen/valaccodebasemodule.vala |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index 90d62cb..cbb418e 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -1749,8 +1749,13 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 
 				ccode.add_assignment (new CCodeMemberAccess.pointer (get_variable_cexpression ("_data%d_".printf (block_id)), "_data%d_".printf (parent_block_id)), ref_call);
 			} else {
-				if (in_constructor || (current_method != null && current_method.binding == MemberBinding.INSTANCE && (!(current_method is CreationMethod && current_class != null && current_class.base_class != null) || current_method.body != b)) ||
-				           (current_property_accessor != null && current_property_accessor.prop.binding == MemberBinding.INSTANCE)) {
+				bool in_instance_method = (current_method != null && current_method.binding == MemberBinding.INSTANCE);
+				bool in_instance_property = (current_property_accessor != null && current_property_accessor.prop.binding == MemberBinding.INSTANCE);
+				// skip self assignment in toplevel block of creation methods with chainup as self is not set at the beginning of the method
+				// the chainup statement takes care of assigning self in the closure struct
+				bool in_creation_method_with_chainup = (current_method is CreationMethod && current_class != null && current_class.base_class != null);
+
+				if (in_constructor || (in_instance_method && (!in_creation_method_with_chainup || current_method.body != b)) || in_instance_property) {
 					var ref_call = new CCodeFunctionCall (get_dup_func_expression (get_data_type_for_symbol (current_type_symbol), b.source_reference));
 					ref_call.add_argument (get_result_cexpression ("self"));