1 /*
   2  * Copyright (c) 2015, 2019, 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 #ifndef SHARE_GC_Z_ZADDRESS_HPP
  25 #define SHARE_GC_Z_ZADDRESS_HPP
  26 
  27 #include "memory/allocation.hpp"
  28 
  29 class ZAddress : public AllStatic {
  30   friend class ZAddressTest;
  31 
  32 private:
  33   static void set_good_mask(uintptr_t mask);
  34 
  35 public:
  36   static void initialize();
  37 
  38   static void flip_to_marked();
  39   static void flip_to_remapped();
  40 
  41   static bool is_null(uintptr_t value);
  42   static bool is_bad(uintptr_t value);
  43   static bool is_good(uintptr_t value);
  44   static bool is_good_or_null(uintptr_t value);
  45   static bool is_weak_bad(uintptr_t value);
  46   static bool is_weak_good(uintptr_t value);
  47   static bool is_weak_good_or_null(uintptr_t value);
  48   static bool is_marked(uintptr_t value);
  49   static bool is_finalizable(uintptr_t value);
  50   static bool is_finalizable_good(uintptr_t value);
  51   static bool is_remapped(uintptr_t value);
  52 
  53   static uintptr_t address(uintptr_t value);
  54   static uintptr_t offset(uintptr_t value);
  55   static uintptr_t good(uintptr_t value);
  56   static uintptr_t good_or_null(uintptr_t value);
  57   static uintptr_t finalizable_good(uintptr_t value);
  58   static uintptr_t marked(uintptr_t value);
  59   static uintptr_t marked0(uintptr_t value);
  60   static uintptr_t marked1(uintptr_t value);
  61   static uintptr_t remapped(uintptr_t value);
  62   static uintptr_t remapped_or_null(uintptr_t value);
  63 };
  64 
  65 #endif // SHARE_GC_Z_ZADDRESS_HPP