1 /*
   2  * Copyright (c) 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 
  25 package sun.jvm.hotspot.gc.z;
  26 
  27 import sun.jvm.hotspot.debugger.Address;
  28 
  29 class ZAddress {
  30     static long as_long(Address value) {
  31         if (value == null) {
  32             return 0;
  33         }
  34         return value.asLongValue();
  35     };
  36 
  37     static boolean is_null(Address value) {
  38         return value == null;
  39     }
  40 
  41     static boolean is_weak_bad(Address value) {
  42         return (as_long(value) & ZGlobals.ZAddressWeakBadMask()) != 0;
  43     }
  44 
  45     static boolean is_weak_good(Address value) {
  46         return !is_weak_bad(value) && !is_null(value);
  47     }
  48 
  49     static boolean is_weak_good_or_null(Address value) {
  50         return !is_weak_bad(value);
  51     }
  52 
  53     static long offset(Address address) {
  54         return as_long(address) & ZGlobals.ZAddressOffsetMask;
  55     }
  56 
  57     static Address address(long value) {
  58         // TODO: Linux-specific - We don't use a heap base on Linux
  59         return ZOop.to_address(value);
  60     }
  61 
  62     static Address good(Address value) {
  63         return address(offset(value) | ZGlobals.ZAddressGoodMask());
  64     }
  65 
  66     static Address good_or_null(Address value) {
  67         return is_null(value) ? value : good(value);
  68     }
  69 }