1 /*

     2  * Copyright (c) 2015, 2017, 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_INLINE_HPP

    25 #define SHARE_GC_Z_ZADDRESS_INLINE_HPP

    26 

    27 #include "gc/z/zAddress.hpp"

    28 #include "gc/z/zGlobals.hpp"

    29 #include "utilities/macros.hpp"

    30 #include OS_CPU_HEADER_INLINE(gc/z/zAddress)

    31 

    32 inline bool ZAddress::is_null(uintptr_t value) {

    33   return value == 0;

    34 }

    35 

    36 inline bool ZAddress::is_bad(uintptr_t value) {

    37   return value & ZAddressBadMask;

    38 }

    39 

    40 inline bool ZAddress::is_good(uintptr_t value) {

    41   return !is_bad(value) && !is_null(value);

    42 }

    43 

    44 inline bool ZAddress::is_good_or_null(uintptr_t value) {

    45   // Checking if an address is "not bad" is an optimized version of

    46   // checking if it's "good or null", which eliminates an explicit

    47   // null check. However, the implicit null check only checks that

    48   // the mask bits are zero, not that the entire address is zero.

    49   // This means that an address without mask bits would pass through

    50   // the barrier as if it was null. This should be harmless as such

    51   // addresses should ever be passed through the barrier.

    52   const bool result = !is_bad(value);

    53   assert((is_good(value) || is_null(value)) == result, "Bad address");

    54   return result;

    55 }

    56 

    57 inline bool ZAddress::is_weak_bad(uintptr_t value) {

    58   return value & ZAddressWeakBadMask;

    59 }

    60 

    61 inline bool ZAddress::is_weak_good(uintptr_t value) {

    62   return !is_weak_bad(value) && !is_null(value);

    63 }

    64 

    65 inline bool ZAddress::is_weak_good_or_null(uintptr_t value) {

    66   return !is_weak_bad(value);

    67 }

    68 

    69 inline bool ZAddress::is_marked(uintptr_t value) {

    70   return value & ZAddressMetadataMarked;

    71 }

    72 

    73 inline bool ZAddress::is_finalizable(uintptr_t value) {

    74   return value & ZAddressMetadataFinalizable;

    75 }

    76 

    77 inline bool ZAddress::is_remapped(uintptr_t value) {

    78   return value & ZAddressMetadataRemapped;

    79 }

    80 

    81 inline uintptr_t ZAddress::offset(uintptr_t value) {

    82   return value & ZAddressOffsetMask;

    83 }

    84 

    85 inline uintptr_t ZAddress::good(uintptr_t value) {

    86   return address(offset(value) | ZAddressGoodMask);

    87 }

    88 

    89 inline uintptr_t ZAddress::good_or_null(uintptr_t value) {

    90   return is_null(value) ? 0 : good(value);

    91 }

    92 

    93 inline uintptr_t ZAddress::finalizable_good(uintptr_t value) {

    94   return address(offset(value) | ZAddressMetadataFinalizable | ZAddressGoodMask);

    95 }

    96 

    97 inline uintptr_t ZAddress::marked(uintptr_t value) {

    98   return address(offset(value) | ZAddressMetadataMarked);

    99 }

   100 

   101 inline uintptr_t ZAddress::marked0(uintptr_t value) {

   102   return address(offset(value) | ZAddressMetadataMarked0);

   103 }

   104 

   105 inline uintptr_t ZAddress::marked1(uintptr_t value) {

   106   return address(offset(value) | ZAddressMetadataMarked1);

   107 }

   108 

   109 inline uintptr_t ZAddress::remapped(uintptr_t value) {

   110   return address(offset(value) | ZAddressMetadataRemapped);

   111 }

   112 

   113 inline uintptr_t ZAddress::remapped_or_null(uintptr_t value) {

   114   return is_null(value) ? 0 : remapped(value);

   115 }

   116 

   117 #endif // SHARE_GC_Z_ZADDRESS_INLINE_HPP