From 9eebc5bbed4f53fde9b339ca5091b199ebfeca56 Mon Sep 17 00:00:00 2001
From: khchen <khchen@gmail.com>
Date: Thu, 21 Jul 2022 11:02:36 +0800
Subject: [PATCH 1/2] native class can be inherited in script

---
 src/core/value.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/core/value.c b/src/core/value.c
index 8c945517..60819f2b 100644
--- a/src/core/value.c
+++ b/src/core/value.c
@@ -553,10 +553,13 @@ Instance* newInstance(PKVM* vm, Class* cls) {
   vmPushTempRef(vm, &inst->_super); // inst.
 
   inst->cls = cls;
-  if (cls->new_fn != NULL) {
-    inst->native = cls->new_fn(vm);
-  } else {
-    inst->native = NULL;
+  inst->native = NULL;
+  while (cls != NULL) {
+    if (cls->new_fn != NULL) {
+      inst->native = cls->new_fn(vm);
+      break;
+    }
+    cls = cls->super_class;
   }
 
   inst->attribs = newMap(vm);

From b16080d3b2f740b9c185b4a7d98ddf2c8eb79a4b Mon Sep 17 00:00:00 2001
From: khchen <khchen@gmail.com>
Date: Thu, 11 Aug 2022 11:23:16 +0800
Subject: [PATCH 2/2] look up destructor in inheritance chain, too.

---
 src/core/value.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/core/value.c b/src/core/value.c
index 60819f2b..4a525b69 100644
--- a/src/core/value.c
+++ b/src/core/value.c
@@ -1223,9 +1223,15 @@ void freeObject(PKVM* vm, Object* self) {
 
     case OBJ_INST: {
       Instance* inst = (Instance*)self;
-      if (inst->cls->delete_fn != NULL) {
-        inst->cls->delete_fn(vm, inst->native);
+      Class* cls = inst->cls;
+      while (cls != NULL) {
+        if (cls->delete_fn != NULL) {
+          cls->delete_fn(vm, inst->native);
+          break;
+        }
+        cls = cls->super_class;
       }
+
       DEALLOCATE(vm, inst, Instance);
       return;
     }