Mark override methods as needed if the super methods are needed.

src/de/inetsoftware/jwebassembly/module/ModuleGenerator.java

@@ -144,13 +144,12 @@ public class ModuleGenerator {
     }
 
     /**
-     * Finish the prepare after all classes/methods are prepare. This must be call before we can start with write the
-     * first method.
+     * Prepare all needed methods/functions and scan the content for more needed stuff.
+     * 
      * @throws IOException
      *             if any I/O error occur
      */
-    public void prepareFinish() throws IOException {
-        // scan all methods that should be write to build optimize structures
+    private void prepareFunctions() throws IOException {
         FunctionName next;
         NEXT:
         while( (next = functions.nextScannLater()) != null ) {
@@ -193,9 +192,19 @@ public class ModuleGenerator {
                 throw new WasmException( "Missing function: " + next.signatureName, -1 );
             }
         }
-        functions.prepareFinish();
+    }
 
+    /**
+     * Finish the prepare after all classes/methods are prepare. This must be call before we can start with write the
+     * first method.
+     * @throws IOException
+     *             if any I/O error occur
+     */
+    public void prepareFinish() throws IOException {
+        prepareFunctions();
         types.prepareFinish( writer, functions, libraries );
+        prepareFunctions(); // prepare of types can add some override methods as needed
+        functions.prepareFinish();
         writer.prepareFinish();
     }
 

src/de/inetsoftware/jwebassembly/module/TypeManager.java

@@ -197,22 +197,22 @@ public class TypeManager {
                     continue;
                 }
                 FunctionName funcName = new FunctionName( method );
-                if( functions.needToWrite( funcName ) ) {
-                    int idx = 0;
-                    // search if the method is already in our list
-                    for( ; idx < methods.size(); idx++ ) {
-                        FunctionName func = methods.get( idx );
-                        if( func.methodName.equals( funcName.methodName ) && func.signature.equals( funcName.signature ) ) {
-                            methods.set( idx, funcName ); // use the override method
-                            break;
-                        }
+
+                int idx = 0;
+                // search if the method is already in our list
+                for( ; idx < methods.size(); idx++ ) {
+                    FunctionName func = methods.get( idx );
+                    if( func.methodName.equals( funcName.methodName ) && func.signature.equals( funcName.signature ) ) {
+                        methods.set( idx, funcName ); // use the override method
+                        functions.markAsNeeded( funcName ); // mark all overridden methods also as needed if the super method is used
+                        break;
                     }
-                    if( idx == methods.size() ) {
-                        // if a new method
-                        methods.add( funcName );
-                    }
-                    functions.setFunctionIndex( funcName, idx );
                 }
+                if( idx == methods.size() && functions.needToWrite( funcName ) ) {
+                    // if a new needed method then add it
+                    methods.add( funcName );
+                }
+                functions.setFunctionIndex( funcName, idx );
             }
         }
 

src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java

@@ -157,7 +157,7 @@ public class TextModuleWriter extends ModuleWriter {
     protected int writeStructType( StructType type ) throws IOException {
         type.setVTable( dataStream.size() );
         for( FunctionName funcName : type.getMethods() ) {
-            int functIdx = functions.get( funcName.signatureName ).id;
+            int functIdx = getFunction( funcName ).id;
             // little-endian byte order
             dataStream.write( functIdx >>> 0 );
             dataStream.write( functIdx >>> 8 );

test/de/inetsoftware/jwebassembly/runtime/Structs.java

@@ -47,6 +47,10 @@ public class Structs extends AbstractBaseTest {
             addParam( list, script, "isSame" );
             addParam( list, script, "isNotSame" );
             addParam( list, script, "simple" );
+            addParam( list, script, "callSuperMethod" );
+            //TODO addParam( list, script, "callVirtualMethod" );
+            addParam( list, script, "useGlobalObject" );
+            addParam( list, script, "multipleAssign" );
         }
         return list;
     }
@@ -92,15 +96,71 @@ public class Structs extends AbstractBaseTest {
             return val.a;
         }
 
+        /**
+         * Call a method that is declared in the super class of the instance 
+         */
+        @Export
+        static int callSuperMethod() {
+            Abc2 val = new Abc2();
+            val.foo();
+            return val.a;
+        }
+
+        /**
+         * Call an overridden method
+         */
+        @Export
+        static int callVirtualMethod() {
+            Abc val = new Abc2();
+            val.bar();
+            return val.a;
+        }
+
+        /**
+         * Access a object in a global/static variable.
+         */
+        static Abc2 valGlobal;
+        @Export
+        static int useGlobalObject() {
+            valGlobal = new Abc2();
+            valGlobal.foo();
+            return valGlobal.a;
+        }
+
+        /**
+         * Assign multiple with a field. There are complex stack operation
+         */
+        @Export
+        static int multipleAssign() {
+            Abc2 val = new Abc2();
+            for( int i = 0; i < 1_000; i++ ) {
+                val.a = 42;
+                // TODO
+                //val = val.abc = new Abc2();
+            }
+            return val.a;
+        }
     }
 
     static class Abc {
         int  a;
 
         long b;
+        
+        final void foo() {
+            a = 1;
+        }
+
+        void bar() {
+            a = 2;
+        }
     }
 
     static class Abc2 extends Abc {
-        Abc  abc;
+        Abc2  abc;
+
+        void bar() {
+            a = 3;
+        }
     }
 }