[vala/emit-let] codegen: Add convenience load_this_parameter method.

[Luca Bruno <lucabru src gnome org>]

commit 777fb1b4d7a2d4c0a02fabd10a76e90d3d9888d8
Author: Luca Bruno <lethalman88 gmail com>
Date:   Tue Jan 18 23:46:44 2011 +0100

    codegen: Add convenience load_this_parameter method.

 codegen/valaccodebasemodule.vala         |   23 ++++++-----------------
 codegen/valaccodememberaccessmodule.vala |   16 ++++++++++++++++
 2 files changed, 22 insertions(+), 17 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index c130e8c..9f44288 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -1001,23 +1001,8 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 			
 			if (requires_destroy (f.variable_type) && instance_finalize_context != null) {
 				push_context (instance_finalize_context);
-
-				var this_access = new MemberAccess.simple ("this");
-				this_access.value_type = get_data_type_for_symbol ((TypeSymbol) f.parent_symbol);
-
-				var field_st = f.parent_symbol as Struct;
-				if (field_st != null && !field_st.is_simple_type ()) {
-					set_cvalue (this_access, new CCodeIdentifier ("(*self)"));
-				} else {
-					set_cvalue (this_access, new CCodeIdentifier ("self"));
-				}
-
-				var ma = new MemberAccess (this_access, f.name);
-				ma.symbol_reference = f;
-				ma.value_type = f.variable_type.copy ();
-				visit_member_access (ma);
-				ccode.add_expression (get_unref_expression (lhs, f.variable_type, ma));
-
+				var type = get_data_type_for_symbol ((TypeSymbol) f.parent_symbol);
+				ccode.add_expression (get_unref_expression_ (f, load_this_parameter (type)));
 				pop_context ();
 			}
 		} else if (f.binding == MemberBinding.CLASS)  {
@@ -3483,6 +3468,10 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 		}
 	}
 
+	public virtual TargetValue load_this_parameter (DataType type) {
+		assert_not_reached ();
+	}
+
 	public virtual TargetValue get_symbol_cvalue (Symbol sym, TargetValue? inner = null, bool not_in_coroutine = false) {
 		assert_not_reached ();
 	}
diff --git a/codegen/valaccodememberaccessmodule.vala b/codegen/valaccodememberaccessmodule.vala
index 7cfd3ed..e279581 100644
--- a/codegen/valaccodememberaccessmodule.vala
+++ b/codegen/valaccodememberaccessmodule.vala
@@ -790,4 +790,20 @@ public abstract class Vala.CCodeMemberAccessModule : CCodeControlFlowModule {
 		result.value_type.value_owned = false;
 		return load_variable (field, result);
 	}
+
+	public override TargetValue load_this_parameter (DataType type) {
+		var result = new GLibValue (type);
+		if (is_in_coroutine ()) {
+			// use closure
+			result.cvalue = new CCodeMemberAccess.pointer (new CCodeIdentifier ("data"), "self");
+		} else {
+			var st = type.data_type as Struct;
+			if (st != null && !st.is_simple_type ()) {
+				result.cvalue = new CCodeIdentifier ("(*self)");
+			} else {
+				result.cvalue = new CCodeIdentifier ("self");
+			}
+		}
+		return result;
+	}
 }