[vala] codegen: Fix freeing on assignment to fields of generic type

[Jürg Billeter <juergbi src gnome org>]

commit cf1e6dd2c1af64ddfe1b2332355c9a437f8c6ddf
Author: Jürg Billeter <j bitron ch>
Date:   Sun Mar 27 20:26:37 2011 +0200

    codegen: Fix freeing on assignment to fields of generic type
    
    Fixes bug 645773.

 codegen/valaccodeassignmentmodule.vala   |    2 +-
 codegen/valaccodebasemodule.vala         |    2 +-
 codegen/valaccodememberaccessmodule.vala |   17 +++++++++++------
 3 files changed, 13 insertions(+), 8 deletions(-)
---
diff --git a/codegen/valaccodeassignmentmodule.vala b/codegen/valaccodeassignmentmodule.vala
index 3f6dd65..1bc79f2 100644
--- a/codegen/valaccodeassignmentmodule.vala
+++ b/codegen/valaccodeassignmentmodule.vala
@@ -239,7 +239,7 @@ public class Vala.CCodeAssignmentModule : CCodeMemberAccessModule {
 	}
 
 	public override void store_field (Field field, TargetValue? instance, TargetValue value) {
-		if (requires_destroy (field.variable_type)) {
+		if (requires_destroy (get_field_cvalue (field, instance).value_type)) {
 			/* unref old value */
 			ccode.add_expression (destroy_field (field, instance));
 		}
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index 4ac24db..ecc80d7 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -2803,7 +2803,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 	// logic in this method is temporarily duplicated in destroy_value
 	// apply changes to both methods
 	public virtual CCodeExpression destroy_variable (Variable variable, TargetValue target_lvalue) {
-		var type = variable.variable_type;
+		var type = target_lvalue.value_type;
 		var cvar = get_cvalue_ (target_lvalue);
 
 		if (type is DelegateType) {
diff --git a/codegen/valaccodememberaccessmodule.vala b/codegen/valaccodememberaccessmodule.vala
index 285c09a..7c14732 100644
--- a/codegen/valaccodememberaccessmodule.vala
+++ b/codegen/valaccodememberaccessmodule.vala
@@ -493,10 +493,15 @@ public abstract class Vala.CCodeMemberAccessModule : CCodeControlFlowModule {
 
 	/* Returns lvalue access to the given field */
 	public override TargetValue get_field_cvalue (Field field, TargetValue? instance) {
-		var result = new GLibValue (field.variable_type.copy ());
+		var value_type = field.variable_type.copy ();
+		if (instance != null) {
+			value_type = value_type.get_actual_type (instance.value_type, null, field);
+		}
+
+		var result = new GLibValue (value_type);
 
-		var array_type = field.variable_type as ArrayType;
-		var delegate_type = field.variable_type as DelegateType;
+		var array_type = result.value_type as ArrayType;
+		var delegate_type = result.value_type as DelegateType;
 		if (field.binding == MemberBinding.INSTANCE) {
 			CCodeExpression pub_inst = null;
 
@@ -558,12 +563,12 @@ public abstract class Vala.CCodeMemberAccessModule : CCodeControlFlowModule {
 
 				if (((TypeSymbol) field.parent_symbol).is_reference_type ()) {
 					result.delegate_target_cvalue = new CCodeMemberAccess.pointer (inst, target_cname);
-					if (field.variable_type.value_owned) {
+					if (result.value_type.value_owned) {
 						result.delegate_target_destroy_notify_cvalue = new CCodeMemberAccess.pointer (inst, target_destroy_notify_cname);
 					}
 				} else {
 					result.delegate_target_cvalue = new CCodeMemberAccess (inst, target_cname);
-					if (field.variable_type.value_owned) {
+					if (result.value_type.value_owned) {
 						result.delegate_target_destroy_notify_cvalue = new CCodeMemberAccess (inst, target_destroy_notify_cname);
 					}
 				}
@@ -620,7 +625,7 @@ public abstract class Vala.CCodeMemberAccessModule : CCodeControlFlowModule {
 				}
 			} else if (delegate_type != null && delegate_type.delegate_symbol.has_target && !field.no_delegate_target) {
 				result.delegate_target_cvalue = new CCodeIdentifier (get_delegate_target_cname (field.get_cname ()));
-				if (field.variable_type.value_owned) {
+				if (result.value_type.value_owned) {
 					result.delegate_target_destroy_notify_cvalue = new CCodeIdentifier (get_delegate_target_destroy_notify_cname (field.get_cname ()));
 				}
 			}