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_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 31 inline bool ZAddress::is_null(uintptr_t value) { 32 return value == 0; 33 } 34 35 inline bool ZAddress::is_bad(uintptr_t value) { 36 return value & ZAddressBadMask; 37 } 38 39 inline bool ZAddress::is_good(uintptr_t value) { 40 return !is_bad(value) && !is_null(value); 41 } 42 43 inline bool ZAddress::is_good_or_null(uintptr_t value) { 44 // Checking if an address is "not bad" is an optimized version of 45 // checking if it's "good or null", which eliminates an explicit 46 // null check. However, the implicit null check only checks that 47 // the mask bits are zero, not that the entire address is zero. 48 // This means that an address without mask bits would pass through 49 // the barrier as if it was null. This should be harmless as such 50 // addresses should ever be passed through the barrier. 51 const bool result = !is_bad(value); 52 assert((is_good(value) || is_null(value)) == result, "Bad address"); 53 return result; 54 } 55 56 inline bool ZAddress::is_weak_bad(uintptr_t value) { 57 return value & ZAddressWeakBadMask; 58 } 59 60 inline bool ZAddress::is_weak_good(uintptr_t value) { 61 return !is_weak_bad(value) && !is_null(value); 62 } 63 64 inline bool ZAddress::is_weak_good_or_null(uintptr_t value) { 65 return !is_weak_bad(value); 66 } 67 68 inline bool ZAddress::is_marked(uintptr_t value) { 69 return value & ZAddressMetadataMarked; 70 } 71 72 inline bool ZAddress::is_finalizable(uintptr_t value) { 73 return value & ZAddressMetadataFinalizable; 74 } 75 76 inline bool ZAddress::is_finalizable_good(uintptr_t value) { 77 return is_finalizable(value) && is_good(value ^ ZAddressMetadataFinalizable); 78 } 79 80 inline bool ZAddress::is_remapped(uintptr_t value) { 81 return value & ZAddressMetadataRemapped; 82 } 83 84 inline uintptr_t ZAddress::address(uintptr_t value) { 85 return value | ZAddressBase; 86 } 87 88 inline uintptr_t ZAddress::offset(uintptr_t value) { 89 return value & ZAddressOffsetMask; 90 } 91 92 inline uintptr_t ZAddress::good(uintptr_t value) { 93 return address(offset(value) | ZAddressGoodMask); 94 } 95 96 inline uintptr_t ZAddress::good_or_null(uintptr_t value) { 97 return is_null(value) ? 0 : good(value); 98 } 99 100 inline uintptr_t ZAddress::finalizable_good(uintptr_t value) { 101 return address(offset(value) | ZAddressMetadataFinalizable | ZAddressGoodMask); 102 } 103 104 inline uintptr_t ZAddress::marked(uintptr_t value) { 105 return address(offset(value) | ZAddressMetadataMarked); 106 } 107 108 inline uintptr_t ZAddress::marked0(uintptr_t value) { 109 return address(offset(value) | ZAddressMetadataMarked0); 110 } 111 112 inline uintptr_t ZAddress::marked1(uintptr_t value) { 113 return address(offset(value) | ZAddressMetadataMarked1); 114 } 115 116 inline uintptr_t ZAddress::remapped(uintptr_t value) { 117 return address(offset(value) | ZAddressMetadataRemapped); 118 } 119 120 inline uintptr_t ZAddress::remapped_or_null(uintptr_t value) { 121 return is_null(value) ? 0 : remapped(value); 122 } 123 124 #endif // SHARE_GC_Z_ZADDRESS_INLINE_HPP