Implemented Exception Throwing fith specific catchers

src/heap_area.rs

@@ -280,6 +280,20 @@ impl ObjectArea {
         }
     }
 
+    pub fn get_object_field_count(&self, reference: ObjectReference) -> usize {
+        match self.get_entry(reference) {
+            CompartmentEntry::Object(o) => o.fields.len(),
+            _ => unreachable!(),
+        }
+    }
+
+    pub fn get_object_field_at(&self, reference: ObjectReference, index: usize) -> ObjectField {
+        match self.get_entry(reference) {
+            CompartmentEntry::Object(o) => o.fields[index],
+            _ => unreachable!(),
+        }
+    }
+
     pub fn get_reference_class_ref(&self, reference: ObjectReference, class_store: &ClassStore) -> ObjectReference {
         match self.get_entry(reference) {
             CompartmentEntry::Object(o) => class_store.get_class_objectref_from_index(o.class_index),
@@ -336,8 +350,8 @@ impl ObjectArea {
             CompartmentEntry::ByteArray(_) => true,
             CompartmentEntry::CharArray(_) => true,
             CompartmentEntry::IntArray(_) => true,
-            CompartmentEntry::EmptyNext(_) => true,
-            CompartmentEntry::EmptyTail() => true,
+            CompartmentEntry::EmptyNext(_) => unreachable!(),
+            CompartmentEntry::EmptyTail() => unreachable!(),
         }
     }
 
@@ -720,7 +734,7 @@ pub struct StaticField {
     pub value: FieldValue,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Copy, Clone)]
 pub struct ObjectField {
     pub value: FieldValue,
 }