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_ZBARRIER_HPP 25 #define SHARE_GC_Z_ZBARRIER_HPP 26 27 #include "memory/allocation.hpp" 28 #include "oops/oop.hpp" 29 30 typedef bool (*ZBarrierFastPath)(uintptr_t); 31 typedef uintptr_t (*ZBarrierSlowPath)(uintptr_t); 32 33 class ZBarrier : public AllStatic { 34 private: 35 static const bool Follow = true; 36 static const bool DontFollow = false; 37 38 static const bool Strong = false; 39 static const bool Finalizable = true; 40 41 static const bool Publish = true; 42 static const bool Overflow = false; 43 44 static void self_heal(volatile oop* p, uintptr_t addr, uintptr_t heal_addr); 45 46 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop barrier(volatile oop* p, oop o); 47 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop weak_barrier(volatile oop* p, oop o); 48 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static void root_barrier(oop* p, oop o); 49 50 static bool is_null_fast_path(uintptr_t addr); 51 static bool is_good_or_null_fast_path(uintptr_t addr); 52 static bool is_weak_good_or_null_fast_path(uintptr_t addr); 53 54 static bool during_mark(); 55 static bool during_relocate(); 56 template <bool finalizable> static bool should_mark_through(uintptr_t addr); 57 template <bool follow, bool finalizable, bool publish> static uintptr_t mark(uintptr_t addr); 58 static uintptr_t remap(uintptr_t addr); 59 static uintptr_t relocate(uintptr_t addr); 60 static uintptr_t relocate_or_mark(uintptr_t addr); 61 static uintptr_t relocate_or_remap(uintptr_t addr); 62 63 static uintptr_t load_barrier_on_oop_slow_path(uintptr_t addr); 64 65 static uintptr_t weak_load_barrier_on_oop_slow_path(uintptr_t addr); 66 static uintptr_t weak_load_barrier_on_weak_oop_slow_path(uintptr_t addr); 67 static uintptr_t weak_load_barrier_on_phantom_oop_slow_path(uintptr_t addr); 68 69 static uintptr_t keep_alive_barrier_on_weak_oop_slow_path(uintptr_t addr); 70 static uintptr_t keep_alive_barrier_on_phantom_oop_slow_path(uintptr_t addr); 71 72 static uintptr_t mark_barrier_on_oop_slow_path(uintptr_t addr); 73 static uintptr_t mark_barrier_on_finalizable_oop_slow_path(uintptr_t addr); 74 static uintptr_t mark_barrier_on_root_oop_slow_path(uintptr_t addr); 75 static uintptr_t mark_barrier_on_invisible_root_oop_slow_path(uintptr_t addr); 76 77 static uintptr_t relocate_barrier_on_root_oop_slow_path(uintptr_t addr); 78 79 public: 80 // Load barrier 81 static oop load_barrier_on_oop(oop o); 82 static oop load_barrier_on_oop_field(volatile oop* p); 83 static oop load_barrier_on_oop_field_preloaded(volatile oop* p, oop o); 84 static void load_barrier_on_oop_array(volatile oop* p, size_t length); 85 static void load_barrier_on_oop_fields(oop o); 86 static oop load_barrier_on_weak_oop_field_preloaded(volatile oop* p, oop o); 87 static oop load_barrier_on_phantom_oop_field_preloaded(volatile oop* p, oop o); 88 static void load_barrier_on_root_oop_field(oop* p); 89 90 // Weak load barrier 91 static oop weak_load_barrier_on_oop_field(volatile oop* p); 92 static oop weak_load_barrier_on_oop_field_preloaded(volatile oop* p, oop o); 93 static oop weak_load_barrier_on_weak_oop(oop o); 94 static oop weak_load_barrier_on_weak_oop_field(volatile oop* p); 95 static oop weak_load_barrier_on_weak_oop_field_preloaded(volatile oop* p, oop o); 96 static oop weak_load_barrier_on_phantom_oop(oop o); 97 static oop weak_load_barrier_on_phantom_oop_field(volatile oop* p); 98 static oop weak_load_barrier_on_phantom_oop_field_preloaded(volatile oop* p, oop o); 99 100 // Is alive barrier 101 static bool is_alive_barrier_on_weak_oop(oop o); 102 static bool is_alive_barrier_on_phantom_oop(oop o); 103 104 // Keep alive barrier 105 static void keep_alive_barrier_on_weak_oop_field(volatile oop* p); 106 static void keep_alive_barrier_on_phantom_oop_field(volatile oop* p); 107 static void keep_alive_barrier_on_phantom_root_oop_field(oop* p); 108 109 // Mark barrier 110 static void mark_barrier_on_oop_field(volatile oop* p, bool finalizable); 111 static void mark_barrier_on_oop_array(volatile oop* p, size_t length, bool finalizable); 112 static void mark_barrier_on_root_oop_field(oop* p); 113 static void mark_barrier_on_invisible_root_oop_field(oop* p); 114 115 // Relocate barrier 116 static void relocate_barrier_on_root_oop_field(oop* p); 117 118 // Narrow oop variants, never used. 119 static oop load_barrier_on_oop_field(volatile narrowOop* p); 120 static oop load_barrier_on_oop_field_preloaded(volatile narrowOop* p, oop o); 121 static void load_barrier_on_oop_array(volatile narrowOop* p, size_t length); 122 static oop load_barrier_on_weak_oop_field_preloaded(volatile narrowOop* p, oop o); 123 static oop load_barrier_on_phantom_oop_field_preloaded(volatile narrowOop* p, oop o); 124 static oop weak_load_barrier_on_oop_field_preloaded(volatile narrowOop* p, oop o); 125 static oop weak_load_barrier_on_weak_oop_field_preloaded(volatile narrowOop* p, oop o); 126 static oop weak_load_barrier_on_phantom_oop_field_preloaded(volatile narrowOop* p, oop o); 127 }; 128 129 #endif // SHARE_GC_Z_ZBARRIER_HPP