From de1befcc1dacfe0ccec66a6e8196dd6202bac02e Mon Sep 17 00:00:00 2001
From: Volker Berlin <volker.berlin@googlemail.com>
Date: Tue, 12 Jan 2021 22:10:14 +0100
Subject: [PATCH] Make interfaces castable to java/lang/Object

---
 src/de/inetsoftware/jwebassembly/module/TypeManager.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/de/inetsoftware/jwebassembly/module/TypeManager.java b/src/de/inetsoftware/jwebassembly/module/TypeManager.java
index 4f75378..938be36 100644
--- a/src/de/inetsoftware/jwebassembly/module/TypeManager.java
+++ b/src/de/inetsoftware/jwebassembly/module/TypeManager.java
@@ -654,6 +654,9 @@ public class TypeManager {
 
             // interface does not need to resolve
             if( classFile.getType() == Type.Interface ) {
+                // to make it possible to cast an interface to java/lang/Object it must have the same fileds also if we never create an instance
+                fields.add( new NamedStorageType( ValueType.i32, className, FIELD_VTABLE ) );
+                fields.add( new NamedStorageType( ValueType.i32, className, FIELD_HASHCODE ) );
                 return;
             }