if (dumpBufferLockOffset != -1) {
if (!dumpBufferLockOffset.isMax()) {
  public static char[] grabDumpBuffer() {    if (dumpBufferLockOffset != -1) {      while (!VM_Synchronization.testAndSet(VM_Magic.getJTOC(),                                             dumpBufferLockOffset, 1))         ;    }    return dumpBuffer;  }