1 /* 2 * Copyright (c) 1997, 2021, 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 #include "precompiled.hpp" 26 #include "classfile/altHashing.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "gc/shared/collectedHeap.inline.hpp" 29 #include "gc/shared/gc_globals.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "memory/universe.hpp" 32 #include "oops/access.inline.hpp" 33 #include "oops/compressedOops.inline.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "oops/verifyOopClosure.hpp" 36 #include "runtime/handles.inline.hpp" 37 #include "runtime/thread.inline.hpp" 38 #include "utilities/copy.hpp" 39 #include "utilities/macros.hpp" 40 41 void oopDesc::print_on(outputStream* st) const { 42 klass()->oop_print_on(const_cast<oopDesc*>(this), st); 43 } 44 45 void oopDesc::print_address_on(outputStream* st) const { 46 st->print("{" INTPTR_FORMAT "}", p2i(this)); 47 48 } 49 50 void oopDesc::print() { print_on(tty); } 51 52 void oopDesc::print_address() { print_address_on(tty); } 53 54 char* oopDesc::print_string() { 55 stringStream st; 56 print_on(&st); 57 return st.as_string(); 58 } 59 60 void oopDesc::print_value() { 61 print_value_on(tty); 62 } 63 64 char* oopDesc::print_value_string() { 65 char buf[100]; 66 stringStream st(buf, sizeof(buf)); 67 print_value_on(&st); 68 return st.as_string(); 69 } 70 71 void oopDesc::print_value_on(outputStream* st) const { 72 oop obj = const_cast<oopDesc*>(this); 73 if (java_lang_String::is_instance(obj)) { 74 java_lang_String::print(obj, st); 75 print_address_on(st); 76 } else { 77 klass()->oop_print_value_on(obj, st); 78 } 79 } 80 81 82 void oopDesc::verify_on(outputStream* st, oopDesc* oop_desc) { 83 if (oop_desc != NULL) { 84 oop_desc->klass()->oop_verify_on(oop_desc, st); 85 } 86 } 87 88 89 void oopDesc::verify(oopDesc* oop_desc) { 90 verify_on(tty, oop_desc); 91 } 92 93 intptr_t oopDesc::slow_identity_hash() { 94 // slow case; we have to acquire the micro lock in order to locate the header 95 Thread* current = Thread::current(); 96 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 97 HandleMark hm(current); 98 Handle object(current, this); 99 return ObjectSynchronizer::FastHashCode(current, object()); 100 } 101 102 // used only for asserts and guarantees 103 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) { 104 if (!Universe::heap()->is_oop(obj)) { 105 return false; 106 } 107 108 // Header verification: the mark is typically non-zero. If we're 109 // at a safepoint, it must not be zero. 110 // Outside of a safepoint, the header could be changing (for example, 111 // another thread could be inflating a lock on this object). 112 if (ignore_mark_word) { 113 return true; 114 } 115 if (obj->mark().value() != 0) { 116 return true; 117 } 118 return !SafepointSynchronize::is_at_safepoint() ; 119 } 120 121 // used only for asserts and guarantees 122 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) { 123 return obj == NULL ? true : is_oop(obj, ignore_mark_word); 124 } 125 126 VerifyOopClosure VerifyOopClosure::verify_oop; 127 128 template <class T> void VerifyOopClosure::do_oop_work(T* p) { 129 oop obj = RawAccess<>::oop_load(p); 130 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)); 131 } 132 133 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); } 134 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); } 135 136 // type test operations that doesn't require inclusion of oop.inline.hpp. 137 bool oopDesc::is_instance_noinline() const { return is_instance(); } 138 bool oopDesc::is_array_noinline() const { return is_array(); } 139 bool oopDesc::is_objArray_noinline() const { return is_objArray(); } 140 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); } 141 bool oopDesc::is_flatArray_noinline() const { return is_flatArray(); } 142 bool oopDesc::is_null_free_array_noinline() const { return is_null_free_array(); } 143 144 bool oopDesc::has_klass_gap() { 145 // Only has a klass gap when compressed class pointers are used. 146 return UseCompressedClassPointers; 147 } 148 149 #if INCLUDE_CDS_JAVA_HEAP 150 void oopDesc::set_narrow_klass(narrowKlass nk) { 151 assert(DumpSharedSpaces, "Used by CDS only. Do not abuse!"); 152 assert(UseCompressedClassPointers, "must be"); 153 _metadata._compressed_klass = nk; 154 } 155 #endif 156 157 void* oopDesc::load_klass_raw(oop obj) { 158 if (UseCompressedClassPointers) { 159 narrowKlass narrow_klass = obj->_metadata._compressed_klass; 160 if (narrow_klass == 0) return NULL; 161 return (void*)CompressedKlassPointers::decode_raw(narrow_klass); 162 } else { 163 return obj->_metadata._klass; 164 } 165 } 166 167 void* oopDesc::load_oop_raw(oop obj, int offset) { 168 uintptr_t addr = (uintptr_t)(void*)obj + (uint)offset; 169 if (UseCompressedOops) { 170 narrowOop narrow_oop = *(narrowOop*)addr; 171 if (CompressedOops::is_null(narrow_oop)) return NULL; 172 return (void*)CompressedOops::decode_raw(narrow_oop); 173 } else { 174 return *(void**)addr; 175 } 176 } 177 178 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); } 179 180 void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); } 181 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); } 182 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); } 183 184 address oopDesc::address_field(int offset) const { return *field_addr<address>(offset); } 185 address oopDesc::address_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<address>(offset)); } 186 187 void oopDesc::address_field_put(int offset, address value) { *field_addr<address>(offset) = value; } 188 void oopDesc::release_address_field_put(int offset, address value) { Atomic::release_store(field_addr<address>(offset), value); } 189 190 Metadata* oopDesc::metadata_field(int offset) const { return *field_addr<Metadata*>(offset); } 191 void oopDesc::metadata_field_put(int offset, Metadata* value) { *field_addr<Metadata*>(offset) = value; } 192 193 Metadata* oopDesc::metadata_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<Metadata*>(offset)); } 194 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { Atomic::release_store(field_addr<Metadata*>(offset), value); } 195 196 jbyte oopDesc::byte_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<jbyte>(offset)); } 197 void oopDesc::release_byte_field_put(int offset, jbyte value) { Atomic::release_store(field_addr<jbyte>(offset), value); } 198 199 jchar oopDesc::char_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<jchar>(offset)); } 200 void oopDesc::release_char_field_put(int offset, jchar value) { Atomic::release_store(field_addr<jchar>(offset), value); } 201 202 jboolean oopDesc::bool_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<jboolean>(offset)); } 203 void oopDesc::release_bool_field_put(int offset, jboolean value) { Atomic::release_store(field_addr<jboolean>(offset), jboolean(value & 1)); } 204 205 jint oopDesc::int_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<jint>(offset)); } 206 void oopDesc::release_int_field_put(int offset, jint value) { Atomic::release_store(field_addr<jint>(offset), value); } 207 208 jshort oopDesc::short_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<jshort>(offset)); } 209 void oopDesc::release_short_field_put(int offset, jshort value) { Atomic::release_store(field_addr<jshort>(offset), value); } 210 211 jlong oopDesc::long_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<jlong>(offset)); } 212 void oopDesc::release_long_field_put(int offset, jlong value) { Atomic::release_store(field_addr<jlong>(offset), value); } 213 214 jfloat oopDesc::float_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<jfloat>(offset)); } 215 void oopDesc::release_float_field_put(int offset, jfloat value) { Atomic::release_store(field_addr<jfloat>(offset), value); } 216 217 jdouble oopDesc::double_field_acquire(int offset) const { return Atomic::load_acquire(field_addr<jdouble>(offset)); } 218 void oopDesc::release_double_field_put(int offset, jdouble value) { Atomic::release_store(field_addr<jdouble>(offset), value); } 219 220 #ifdef ASSERT 221 void oopDesc::verify_forwardee(oop forwardee) { 222 #if INCLUDE_CDS_JAVA_HEAP 223 assert(!Universe::heap()->is_archived_object(forwardee) && !Universe::heap()->is_archived_object(this), 224 "forwarding archive object"); 225 #endif 226 } 227 228 bool oopDesc::get_UseParallelGC() { return UseParallelGC; } 229 bool oopDesc::get_UseG1GC() { return UseG1GC; } 230 #endif