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/globalDefinitions.hpp" 30 #include "utilities/macros.hpp" 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_finalizable_good(uintptr_t value) { 78 return is_finalizable(value) && is_good(value ^ ZAddressMetadataFinalizable); 79 } 80 81 inline bool ZAddress::is_remapped(uintptr_t value) { 82 return value & ZAddressMetadataRemapped; 83 } 84 85 inline bool ZAddress::is_in(uintptr_t value) { 86 // Check that exactly one non-offset bit is set 87 if (!is_power_of_2(value & ~ZAddressOffsetMask)) { 88 return false; 89 } 90 91 // Check that one of the non-finalizable metadata is set 92 return value & (ZAddressMetadataMask & ~ZAddressMetadataFinalizable); 93 } 94 95 inline uintptr_t ZAddress::address(uintptr_t value) { 96 return value | ZAddressBase; 97 } 98 99 inline uintptr_t ZAddress::offset(uintptr_t value) { 100 return value & ZAddressOffsetMask; 101 } 102 103 inline uintptr_t ZAddress::good(uintptr_t value) { 104 return address(offset(value) | ZAddressGoodMask); 105 } 106 107 inline uintptr_t ZAddress::good_or_null(uintptr_t value) { 108 return is_null(value) ? 0 : good(value); 109 } 110 111 inline uintptr_t ZAddress::finalizable_good(uintptr_t value) { 112 return address(offset(value) | ZAddressMetadataFinalizable | ZAddressGoodMask); 113 } 114 115 inline uintptr_t ZAddress::marked(uintptr_t value) { 116 return address(offset(value) | ZAddressMetadataMarked); 117 } 118 119 inline uintptr_t ZAddress::marked0(uintptr_t value) { 120 return address(offset(value) | ZAddressMetadataMarked0); 121 } 122 123 inline uintptr_t ZAddress::marked1(uintptr_t value) { 124 return address(offset(value) | ZAddressMetadataMarked1); 125 } 126 127 inline uintptr_t ZAddress::remapped(uintptr_t value) { 128 return address(offset(value) | ZAddressMetadataRemapped); 129 } 130 131 inline uintptr_t ZAddress::remapped_or_null(uintptr_t value) { 132 return is_null(value) ? 0 : remapped(value); 133 } 134 135 #endif // SHARE_GC_Z_ZADDRESS_INLINE_HPP