1 /* 2 * Copyright (c) 2015, 2025, 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 25 #ifndef SHARE_OOPS_INSTANCEKLASS_INLINE_HPP 26 #define SHARE_OOPS_INSTANCEKLASS_INLINE_HPP 27 28 #include "oops/instanceKlass.hpp" 29 30 #include "memory/memRegion.hpp" 31 #include "oops/fieldInfo.inline.hpp" 32 #include "oops/klass.inline.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "runtime/atomic.hpp" 35 #include "utilities/devirtualizer.inline.hpp" 36 #include "utilities/globalDefinitions.hpp" 37 38 inline intptr_t* InstanceKlass::start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 39 inline intptr_t* InstanceKlass::end_of_itable() const { return start_of_itable() + itable_length(); } 40 41 inline oop InstanceKlass::static_field_base_raw() { return java_mirror(); } 42 43 inline Symbol* InstanceKlass::field_name(int index) const { return field(index).name(constants()); } 44 inline Symbol* InstanceKlass::field_signature(int index) const { return field(index).signature(constants()); } 45 46 inline int InstanceKlass::java_fields_count() const { return FieldInfoStream::num_java_fields(fieldinfo_stream()); } 47 inline int InstanceKlass::total_fields_count() const { return FieldInfoStream::num_total_fields(fieldinfo_stream()); } 48 49 inline OopMapBlock* InstanceKlass::start_of_nonstatic_oop_maps() const { 50 return (OopMapBlock*)(start_of_itable() + itable_length()); 51 } 52 53 inline Klass** InstanceKlass::end_of_nonstatic_oop_maps() const { 54 return (Klass**)(start_of_nonstatic_oop_maps() + 55 nonstatic_oop_map_count()); 56 } 57 58 inline InstanceKlass* volatile* InstanceKlass::adr_implementor() const { 59 if (is_interface()) { 60 return (InstanceKlass* volatile*)end_of_nonstatic_oop_maps(); 61 } else { 62 return nullptr; 63 } 64 } 65 66 inline InlineKlass* InstanceKlass::get_inline_type_field_klass(int idx) const { 67 assert(has_inline_type_fields(), "Sanity checking"); 68 assert(idx < java_fields_count(), "IOOB"); 69 InlineKlass* k = inline_layout_info(idx).klass(); 70 assert(k != nullptr, "Should always be set before being read"); 71 return k; 72 } 73 74 inline InlineKlass* InstanceKlass::get_inline_type_field_klass_or_null(int idx) const { 75 assert(has_inline_type_fields(), "Sanity checking"); 76 assert(idx < java_fields_count(), "IOOB"); 77 InlineKlass* k = inline_layout_info(idx).klass(); 78 return k; 79 } 80 81 inline ObjArrayKlass* InstanceKlass::array_klasses_acquire() const { 82 return Atomic::load_acquire(&_array_klasses); 83 } 84 85 inline void InstanceKlass::release_set_array_klasses(ObjArrayKlass* k) { 86 Atomic::release_store(&_array_klasses, k); 87 } 88 89 // The iteration over the oops in objects is a hot path in the GC code. 90 // By force inlining the following functions, we get similar GC performance 91 // as the previous macro based implementation. 92 93 template <typename T, class OopClosureType> 94 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure) { 95 T* p = obj->field_addr<T>(map->offset()); 96 T* const end = p + map->count(); 97 98 for (; p < end; ++p) { 99 Devirtualizer::do_oop(closure, p); 100 } 101 } 102 103 template <typename T, class OopClosureType> 104 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure) { 105 T* const start = obj->field_addr<T>(map->offset()); 106 T* p = start + map->count(); 107 108 while (start < p) { 109 --p; 110 Devirtualizer::do_oop(closure, p); 111 } 112 } 113 114 template <typename T, class OopClosureType> 115 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr) { 116 T* p = obj->field_addr<T>(map->offset()); 117 T* end = p + map->count(); 118 119 T* const l = (T*)mr.start(); 120 T* const h = (T*)mr.end(); 121 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && 122 mask_bits((intptr_t)h, sizeof(T)-1) == 0, 123 "bounded region must be properly aligned"); 124 125 if (p < l) { 126 p = l; 127 } 128 if (end > h) { 129 end = h; 130 } 131 132 for (;p < end; ++p) { 133 Devirtualizer::do_oop(closure, p); 134 } 135 } 136 137 template <typename T, class OopClosureType> 138 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure) { 139 OopMapBlock* map = start_of_nonstatic_oop_maps(); 140 OopMapBlock* const end_map = map + nonstatic_oop_map_count(); 141 142 for (; map < end_map; ++map) { 143 oop_oop_iterate_oop_map<T>(map, obj, closure); 144 } 145 } 146 147 template <typename T, class OopClosureType> 148 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure) { 149 OopMapBlock* const start_map = start_of_nonstatic_oop_maps(); 150 OopMapBlock* map = start_map + nonstatic_oop_map_count(); 151 152 while (start_map < map) { 153 --map; 154 oop_oop_iterate_oop_map_reverse<T>(map, obj, closure); 155 } 156 } 157 158 template <typename T, class OopClosureType> 159 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr) { 160 OopMapBlock* map = start_of_nonstatic_oop_maps(); 161 OopMapBlock* const end_map = map + nonstatic_oop_map_count(); 162 163 for (;map < end_map; ++map) { 164 oop_oop_iterate_oop_map_bounded<T>(map, obj, closure, mr); 165 } 166 } 167 168 template <typename T, class OopClosureType> 169 ALWAYSINLINE void InstanceKlass::oop_oop_iterate(oop obj, OopClosureType* closure) { 170 if (Devirtualizer::do_metadata(closure)) { 171 Devirtualizer::do_klass(closure, this); 172 } 173 174 oop_oop_iterate_oop_maps<T>(obj, closure); 175 } 176 177 template <typename T, class OopClosureType> 178 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) { 179 assert(!Devirtualizer::do_metadata(closure), 180 "Code to handle metadata is not implemented"); 181 182 oop_oop_iterate_oop_maps_reverse<T>(obj, closure); 183 } 184 185 template <typename T, class OopClosureType> 186 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) { 187 if (Devirtualizer::do_metadata(closure)) { 188 if (mr.contains(obj)) { 189 Devirtualizer::do_klass(closure, this); 190 } 191 } 192 193 oop_oop_iterate_oop_maps_bounded<T>(obj, closure, mr); 194 } 195 196 #endif // SHARE_OOPS_INSTANCEKLASS_INLINE_HPP