43     static {
  44         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  45     }
  46 
  47     private static synchronized void initialize(TypeDataBase db) {
  48         Type type = db.lookupType("ZHeap");
  49 
  50         pageAllocatorFieldOffset = type.getAddressField("_page_allocator").getOffset();
  51         pageTableFieldOffset = type.getAddressField("_pagetable").getOffset();
  52     }
  53 
  54     public ZHeap(Address addr) {
  55         super(addr);
  56     }
  57 
  58     private ZPageAllocator pageAllocator() {
  59         Address pageAllocatorAddr = addr.addOffsetTo(pageAllocatorFieldOffset);
  60         return (ZPageAllocator)VMObjectFactory.newObject(ZPageAllocator.class, pageAllocatorAddr);
  61     }
  62 
  63     ZPageTable pageTable() {
  64         return (ZPageTable)VMObjectFactory.newObject(ZPageTable.class, addr.addOffsetTo(pageTableFieldOffset));
  65     }
  66 
  67     public long maxCapacity() {
  68         return pageAllocator().maxCapacity();
  69     }
  70 
  71     public long capacity() {
  72         return pageAllocator().capacity();
  73     }
  74 
  75     public long used() {
  76         return pageAllocator().used();
  77     }
  78 
  79     boolean is_relocating(Address o) {
  80         return pageTable().is_relocating(o);
  81     }
  82 
  83     Address forward_object(Address addr) {

  43     static {
  44         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  45     }
  46 
  47     private static synchronized void initialize(TypeDataBase db) {
  48         Type type = db.lookupType("ZHeap");
  49 
  50         pageAllocatorFieldOffset = type.getAddressField("_page_allocator").getOffset();
  51         pageTableFieldOffset = type.getAddressField("_pagetable").getOffset();
  52     }
  53 
  54     public ZHeap(Address addr) {
  55         super(addr);
  56     }
  57 
  58     private ZPageAllocator pageAllocator() {
  59         Address pageAllocatorAddr = addr.addOffsetTo(pageAllocatorFieldOffset);
  60         return (ZPageAllocator)VMObjectFactory.newObject(ZPageAllocator.class, pageAllocatorAddr);
  61     }
  62 
  63     public ZPageTable pageTable() {
  64         return (ZPageTable)VMObjectFactory.newObject(ZPageTable.class, addr.addOffsetTo(pageTableFieldOffset));
  65     }
  66 
  67     public long maxCapacity() {
  68         return pageAllocator().maxCapacity();
  69     }
  70 
  71     public long capacity() {
  72         return pageAllocator().capacity();
  73     }
  74 
  75     public long used() {
  76         return pageAllocator().used();
  77     }
  78 
  79     boolean is_relocating(Address o) {
  80         return pageTable().is_relocating(o);
  81     }
  82 
  83     Address forward_object(Address addr) {