[GR-49858] Change type of DynamicHub.hubType to byte.

Author: peter-hofer

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/hub/DynamicHub.java

@@ -184,7 +184,7 @@ public final class DynamicHub implements AnnotatedElement, java.lang.reflect.Typ
      * The returned category does not necessarily match the {@link LayoutEncoding}, see
      * {@link Hybrid} objects for more details.
      */
-    private final int hubType;
+    private final byte hubType;
 
     /**
      * Used to quickly determine if this class is a subclass of {@link Reference}.
@@ -455,7 +455,7 @@ public final class DynamicHub implements AnnotatedElement, java.lang.reflect.Typ
     private ReflectionMetadata reflectionMetadata;
 
     @Platforms(Platform.HOSTED_ONLY.class)
-    public DynamicHub(Class<?> hostedJavaClass, String name, int hubType, ReferenceType referenceType, DynamicHub superType,
+    public DynamicHub(Class<?> hostedJavaClass, String name, byte hubType, ReferenceType referenceType, DynamicHub superType,
                     DynamicHub componentHub, String sourceFileName, int modifiers, short flags, ClassLoader classLoader,
                     Class<?> nestHost, String simpleBinaryName, Object declaringClass, String signature, int layerId) {
         this.hostedJavaClass = hostedJavaClass;
@@ -503,7 +503,7 @@ public static DynamicHub allocate(String name, DynamicHub superHub, DynamicHub c
 
         ReferenceType referenceType = ReferenceType.computeReferenceType(DynamicHub.toClass(superHub));
         // GR-59683: HubType.OBJECT_ARRAY?
-        int hubTybe = referenceType == ReferenceType.None ? HubType.INSTANCE : HubType.REFERENCE_INSTANCE;
+        byte hubType = (byte) ((referenceType == ReferenceType.None) ? HubType.INSTANCE : HubType.REFERENCE_INSTANCE);
 
         DynamicHubCompanion companion = new DynamicHubCompanion(classLoader);
         /* Always allow unsafe allocation for classes that were loaded at run-time. */
@@ -555,7 +555,7 @@ public static DynamicHub allocate(String name, DynamicHub superHub, DynamicHub c
         DynamicHubOffsets dynamicHubOffsets = DynamicHubOffsets.singleton();
         /* Write fields in defining order. */
         writeObject(hub, dynamicHubOffsets.getNameOffset(), name);
-        writeInt(hub, dynamicHubOffsets.getHubTypeOffset(), hubTybe);
+        writeByte(hub, dynamicHubOffsets.getHubTypeOffset(), hubType);
         writeByte(hub, dynamicHubOffsets.getReferenceTypeOffset(), referenceType.getValue());
 
         writeInt(hub, dynamicHubOffsets.getLayoutEncodingOffset(), layoutEncoding);

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/SVMHost.java

@@ -610,7 +610,7 @@ public ClassInitializationSupport getClassInitializationSupport() {
         return classInitializationSupport;
     }
 
-    private static int computeHubType(AnalysisType type) {
+    private static byte computeHubType(AnalysisType type) {
         if (type.isArray()) {
             if (type.getComponentType().isPrimitive() || type.getComponentType().isWordType()) {
                 return HubType.PRIMITIVE_ARRAY;