1 /* 2 * Copyright (c) 2015, 2017, 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 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop barrier(volatile oop* p, oop o); 45 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop weak_barrier(volatile oop* p, oop o); 46 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static void root_barrier(oop* p, oop o); 47 48 static bool is_null_fast_path(uintptr_t addr); 49 static bool is_good_or_null_fast_path(uintptr_t addr); 50 static bool is_weak_good_or_null_fast_path(uintptr_t addr); 51 52 static bool during_mark(); 53 static bool during_relocate(); 54 template <bool finalizable> static bool should_mark_through(uintptr_t addr); 55 template <bool follow, bool finalizable, bool publish> static uintptr_t mark(uintptr_t addr); 56 static uintptr_t remap(uintptr_t addr); 57 static uintptr_t relocate(uintptr_t addr); 58 static uintptr_t relocate_or_mark(uintptr_t addr); 59 static uintptr_t relocate_or_remap(uintptr_t addr); 60 61 static uintptr_t load_barrier_on_oop_slow_path(uintptr_t addr); 62 63 static uintptr_t weak_load_barrier_on_oop_slow_path(uintptr_t addr); 64 static uintptr_t weak_load_barrier_on_weak_oop_slow_path(uintptr_t addr); 65 static uintptr_t weak_load_barrier_on_phantom_oop_slow_path(uintptr_t addr); 66 67 static uintptr_t keep_alive_barrier_on_weak_oop_slow_path(uintptr_t addr); 68 static uintptr_t keep_alive_barrier_on_phantom_oop_slow_path(uintptr_t addr); 69 70 static uintptr_t mark_barrier_on_oop_slow_path(uintptr_t addr); 71 static uintptr_t mark_barrier_on_finalizable_oop_slow_path(uintptr_t addr); 72 static uintptr_t mark_barrier_on_root_oop_slow_path(uintptr_t addr); 73 static uintptr_t mark_barrier_on_invisible_root_oop_slow_path(uintptr_t addr); 74 75 static uintptr_t relocate_barrier_on_root_oop_slow_path(uintptr_t addr); 76 77 public: 78 // Load barrier 79 static oop load_barrier_on_oop(oop o); 80 static oop load_barrier_on_oop_field(volatile oop* p); 81 static oop load_barrier_on_oop_field_preloaded(volatile oop* p, oop o); 82 static void load_barrier_on_oop_array(volatile oop* p, size_t length); 83 static void load_barrier_on_oop_fields(oop o); 84 static oop load_barrier_on_weak_oop_field_preloaded(volatile oop* p, oop o); 85 static oop load_barrier_on_phantom_oop_field_preloaded(volatile oop* p, oop o); 86 static void load_barrier_on_root_oop_field(oop* p); 87 88 // Weak load barrier 89 static oop weak_load_barrier_on_oop_field(volatile oop* p); 90 static oop weak_load_barrier_on_oop_field_preloaded(volatile oop* p, oop o); 91 static oop weak_load_barrier_on_weak_oop(oop o); 92 static oop weak_load_barrier_on_weak_oop_field(volatile oop* p); 93 static oop weak_load_barrier_on_weak_oop_field_preloaded(volatile oop* p, oop o); 94 static oop weak_load_barrier_on_phantom_oop(oop o); 95 static oop weak_load_barrier_on_phantom_oop_field(volatile oop* p); 96 static oop weak_load_barrier_on_phantom_oop_field_preloaded(volatile oop* p, oop o); 97 98 // Is alive barrier 99 static bool is_alive_barrier_on_weak_oop(oop o); 100 static bool is_alive_barrier_on_phantom_oop(oop o); 101 102 // Keep alive barrier 103 static void keep_alive_barrier_on_weak_oop_field(volatile oop* p); 104 static void keep_alive_barrier_on_phantom_oop_field(volatile oop* p); 105 static void keep_alive_barrier_on_phantom_root_oop_field(oop* p); 106 107 // Mark barrier 108 static void mark_barrier_on_oop_field(volatile oop* p, bool finalizable); 109 static void mark_barrier_on_oop_array(volatile oop* p, size_t length, bool finalizable); 110 static void mark_barrier_on_root_oop_field(oop* p); 111 static void mark_barrier_on_invisible_root_oop_field(oop* p); 112 113 // Relocate barrier 114 static void relocate_barrier_on_root_oop_field(oop* p); 115 116 // Narrow oop variants, never used. 117 static oop load_barrier_on_oop_field(volatile narrowOop* p); 118 static oop load_barrier_on_oop_field_preloaded(volatile narrowOop* p, oop o); 119 static void load_barrier_on_oop_array(volatile narrowOop* p, size_t length); 120 static oop load_barrier_on_weak_oop_field_preloaded(volatile narrowOop* p, oop o); 121 static oop load_barrier_on_phantom_oop_field_preloaded(volatile narrowOop* p, oop o); 122 static oop weak_load_barrier_on_oop_field_preloaded(volatile narrowOop* p, oop o); 123 static oop weak_load_barrier_on_weak_oop_field_preloaded(volatile narrowOop* p, oop o); 124 static oop weak_load_barrier_on_phantom_oop_field_preloaded(volatile narrowOop* p, oop o); 125 }; 126 127 #endif // SHARE_GC_Z_ZBARRIER_HPP