1 /* 2 * Copyright (c) 2017, 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 #ifndef SHARE_GC_Z_ZNMETHODTABLEENTRY_HPP 25 #define SHARE_GC_Z_ZNMETHODTABLEENTRY_HPP 26 27 #include "gc/z/zBitField.hpp" 28 #include "memory/allocation.hpp" 29 30 // 31 // NMethod table entry layout 32 // -------------------------- 33 // 34 // 6 35 // 3 3 2 1 0 36 // +--------------------------------------------------------------------+-+-+-+ 37 // |11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111|1|1|1| 38 // +--------------------------------------------------------------------+-+-+-+ 39 // | | | | 40 // | 2-2 Non-immediate Oops Flag (1-bits) * | | 41 // | | | 42 // | 1-1 Immediate Oops/Unregistered Flag (1-bits) * | 43 // | | 44 // | 0-0 Registered Flag (1-bits) * 45 // | 46 // * 63-3 NMethod Address (61-bits) 47 // 48 49 class nmethod; 50 51 class ZNMethodTableEntry : public CHeapObj<mtGC> { 52 private: 53 typedef ZBitField<uint64_t, bool, 0, 1> field_registered; 54 typedef ZBitField<uint64_t, bool, 1, 1> field_unregistered; 55 typedef ZBitField<uint64_t, bool, 1, 1> field_immediate_oops; 56 typedef ZBitField<uint64_t, bool, 2, 1> field_non_immediate_oops; 57 typedef ZBitField<uint64_t, nmethod*, 3, 61, 3> field_method; 58 59 uint64_t _entry; 60 61 public: 62 explicit ZNMethodTableEntry(bool unregistered = false) : 63 _entry(field_unregistered::encode(unregistered) | 64 field_registered::encode(false)) {} 65 66 ZNMethodTableEntry(nmethod* method, bool non_immediate_oops, bool immediate_oops) : 67 _entry(field_method::encode(method) | 68 field_non_immediate_oops::encode(non_immediate_oops) | 69 field_immediate_oops::encode(immediate_oops) | 70 field_registered::encode(true)) {} 71 72 bool registered() const { 73 return field_registered::decode(_entry); 74 } 75 76 bool unregistered() const { 77 return field_unregistered::decode(_entry); 78 } 79 80 bool immediate_oops() const { 81 return field_immediate_oops::decode(_entry); 82 } 83 84 bool non_immediate_oops() const { 85 return field_non_immediate_oops::decode(_entry); 86 } 87 88 nmethod* method() const { 89 return field_method::decode(_entry); 90 } 91 }; 92 93 #endif // SHARE_GC_Z_ZNMETHODTABLEENTRY_HPP