@Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    InstructionKey key = (InstructionKey)o;
    return myOffset == key.myOffset && Arrays.equals(myCallStack, key.myCallStack);
  }
@Override
  public boolean equals(Object o)