1 /* 2 * Copyright (c) 2015, 2022, 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/allStatic.hpp" 28 #include "memory/iterator.hpp" 29 #include "oops/oop.hpp" 30 31 typedef bool (*ZBarrierFastPath)(uintptr_t); 32 typedef uintptr_t (*ZBarrierSlowPath)(uintptr_t); 33 34 class ZBarrier : public AllStatic { 35 private: 36 static const bool GCThread = true; 37 static const bool AnyThread = false; 38 39 static const bool Follow = true; 40 static const bool DontFollow = false; 41 42 static const bool Strong = false; 43 static const bool Finalizable = true; 44 45 static const bool Publish = true; 46 static const bool Overflow = false; 47 48 template <ZBarrierFastPath fast_path> static void self_heal(volatile oop* p, uintptr_t addr, uintptr_t heal_addr); 49 50 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop barrier(volatile oop* p, oop o); 51 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop weak_barrier(volatile oop* p, oop o); 52 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static void root_barrier(oop* p, oop o); 53 54 static bool is_good_or_null_fast_path(uintptr_t addr); 55 static bool is_weak_good_or_null_fast_path(uintptr_t addr); 56 static bool is_marked_or_null_fast_path(uintptr_t addr); 57 58 static bool during_mark(); 59 static bool during_relocate(); 60 template <bool finalizable> static bool should_mark_through(uintptr_t addr); 61 template <bool gc_thread, bool follow, bool finalizable, bool publish> static uintptr_t mark(uintptr_t addr); 62 static uintptr_t remap(uintptr_t addr); 63 static uintptr_t relocate(uintptr_t addr); 64 static uintptr_t relocate_or_mark(uintptr_t addr); 65 static uintptr_t relocate_or_mark_no_follow(uintptr_t addr); 66 static uintptr_t relocate_or_remap(uintptr_t addr); 67 68 static uintptr_t load_barrier_on_oop_slow_path(uintptr_t addr); 69 static uintptr_t load_barrier_on_invisible_root_oop_slow_path(uintptr_t addr); 70 71 static uintptr_t weak_load_barrier_on_oop_slow_path(uintptr_t addr); 72 static uintptr_t weak_load_barrier_on_weak_oop_slow_path(uintptr_t addr); 73 static uintptr_t weak_load_barrier_on_phantom_oop_slow_path(uintptr_t addr); 74 75 static uintptr_t keep_alive_barrier_on_oop_slow_path(uintptr_t addr); 76 static uintptr_t keep_alive_barrier_on_weak_oop_slow_path(uintptr_t addr); 77 static uintptr_t keep_alive_barrier_on_phantom_oop_slow_path(uintptr_t addr); 78 79 static uintptr_t mark_barrier_on_oop_slow_path(uintptr_t addr); 80 static uintptr_t mark_barrier_on_finalizable_oop_slow_path(uintptr_t addr); 81 82 static void verify_on_weak(volatile oop* referent_addr) NOT_DEBUG_RETURN; 83 84 public: 85 // Load barrier 86 static oop load_barrier_on_oop(oop o); 87 static oop load_barrier_on_oop_field(volatile oop* p); 88 static oop load_barrier_on_oop_field_preloaded(volatile oop* p, oop o); 89 static void load_barrier_on_oop_array(volatile oop* p, size_t length); 90 static void load_barrier_on_oop_fields(oop o); 91 static oop load_barrier_on_weak_oop_field_preloaded(volatile oop* p, oop o); 92 static oop load_barrier_on_phantom_oop_field_preloaded(volatile oop* p, oop o); 93 static void load_barrier_on_root_oop_field(oop* p); 94 static void load_barrier_on_invisible_root_oop_field(oop* p); 95 96 // Weak load barrier 97 static oop weak_load_barrier_on_oop_field(volatile oop* p); 98 static oop weak_load_barrier_on_oop_field_preloaded(volatile oop* p, oop o); 99 static oop weak_load_barrier_on_weak_oop(oop o); 100 static oop weak_load_barrier_on_weak_oop_field_preloaded(volatile oop* p, oop o); 101 static oop weak_load_barrier_on_phantom_oop(oop o); 102 static oop weak_load_barrier_on_phantom_oop_field_preloaded(volatile oop* p, oop o); 103 104 // Is alive barrier 105 static bool is_alive_barrier_on_weak_oop(oop o); 106 static bool is_alive_barrier_on_phantom_oop(oop o); 107 108 // Keep alive barrier 109 static void keep_alive_barrier_on_oop(oop o); 110 static void keep_alive_barrier_on_weak_oop_field(volatile oop* p); 111 static void keep_alive_barrier_on_phantom_oop_field(volatile oop* p); 112 static void keep_alive_barrier_on_phantom_root_oop_field(oop* p); 113 114 // Mark barrier 115 static void mark_barrier_on_oop_field(volatile oop* p, bool finalizable); 116 static void mark_barrier_on_oop_array(volatile oop* p, size_t length, bool finalizable); 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 class ZLoadBarrierOopClosure : public BasicOopIterateClosure { 130 public: 131 virtual void do_oop(oop* p); 132 virtual void do_oop(narrowOop* p); 133 }; 134 135 #endif // SHARE_GC_Z_ZBARRIER_HPP