1 /*
   2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #include "precompiled.hpp"
  25 #include "gc/z/zAddress.inline.hpp"
  26 #include "gc/z/zGlobals.hpp"
  27 #include "runtime/thread.hpp"
  28 
  29 void ZAddressMasks::set_good_mask(uintptr_t mask) {
  30   uintptr_t old_bad_mask = ZAddressBadMask;
  31   ZAddressGoodMask = mask;
  32   ZAddressBadMask = ZAddressGoodMask ^ ZAddressMetadataMask;
  33   ZAddressWeakBadMask = (ZAddressGoodMask | ZAddressMetadataRemapped | ZAddressMetadataFinalizable) ^ ZAddressMetadataMask;
  34 }
  35 
  36 void ZAddressMasks::initialize() {
  37   ZAddressMetadataMarked = ZAddressMetadataMarked0;
  38   set_good_mask(ZAddressMetadataRemapped);
  39 }
  40 
  41 void ZAddressMasks::flip_to_marked() {
  42   ZAddressMetadataMarked ^= (ZAddressMetadataMarked0 | ZAddressMetadataMarked1);
  43   set_good_mask(ZAddressMetadataMarked);
  44 }
  45 
  46 void ZAddressMasks::flip_to_remapped() {
  47   set_good_mask(ZAddressMetadataRemapped);
  48 }