1 /* 2 * Copyright (c) 1997, 2018, 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 "memory/metaspaceShared.inline.hpp" 29 #include "memory/resourceArea.hpp" 30 #include "oops/access.inline.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "oops/verifyOopClosure.hpp" 33 #include "runtime/handles.inline.hpp" 34 #include "runtime/thread.inline.hpp" 35 #include "utilities/copy.hpp" 36 37 bool always_do_update_barrier = false; 38 39 void oopDesc::print_on(outputStream* st) const { 40 klass()->oop_print_on(oop(this), st); 41 } 42 43 void oopDesc::print_address_on(outputStream* st) const { 44 st->print("{" INTPTR_FORMAT "}", p2i(this)); 45 46 } 47 48 void oopDesc::print() { print_on(tty); } 49 50 void oopDesc::print_address() { print_address_on(tty); } 51 52 char* oopDesc::print_string() { 53 stringStream st; 54 print_on(&st); 55 return st.as_string(); 56 } 57 58 void oopDesc::print_value() { 59 print_value_on(tty); 60 } 61 62 char* oopDesc::print_value_string() { 63 char buf[100]; 64 stringStream st(buf, sizeof(buf)); 65 print_value_on(&st); 66 return st.as_string(); 67 } 68 69 void oopDesc::print_value_on(outputStream* st) const { 70 oop obj = oop(this); 71 if (java_lang_String::is_instance(obj)) { 72 java_lang_String::print(obj, st); 73 print_address_on(st); 74 } else { 75 klass()->oop_print_value_on(obj, st); 76 } 77 } 78 79 80 void oopDesc::verify_on(outputStream* st, oopDesc* oop_desc) { 81 if (oop_desc != NULL) { 82 oop_desc->klass()->oop_verify_on(oop_desc, st); 83 } 84 } 85 86 87 void oopDesc::verify(oopDesc* oop_desc) { 88 verify_on(tty, oop_desc); 89 } 90 91 intptr_t oopDesc::slow_identity_hash() { 92 // slow case; we have to acquire the micro lock in order to locate the header 93 Thread* THREAD = Thread::current(); 94 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 95 HandleMark hm(THREAD); 96 Handle object(THREAD, this); 97 return ObjectSynchronizer::identity_hash_value_for(object); 98 } 99 100 // When String table needs to rehash 101 unsigned int oopDesc::new_hash(juint seed) { 102 EXCEPTION_MARK; 103 ResourceMark rm; 104 int length; 105 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD); 106 if (chars != NULL) { 107 // Use alternate hashing algorithm on the string 108 return AltHashing::murmur3_32(seed, chars, length); 109 } else { 110 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash"); 111 return 0; 112 } 113 } 114 115 // used only for asserts and guarantees 116 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) { 117 if (!Universe::heap()->is_oop(obj)) { 118 return false; 119 } 120 121 // Header verification: the mark is typically non-NULL. If we're 122 // at a safepoint, it must not be null. 123 // Outside of a safepoint, the header could be changing (for example, 124 // another thread could be inflating a lock on this object). 125 if (ignore_mark_word) { 126 return true; 127 } 128 if (obj->mark_raw() != NULL) { 129 return true; 130 } 131 return !SafepointSynchronize::is_at_safepoint(); 132 } 133 134 // used only for asserts and guarantees 135 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) { 136 return obj == NULL ? true : is_oop(obj, ignore_mark_word); 137 } 138 139 #ifndef PRODUCT 140 // used only for asserts 141 bool oopDesc::is_unlocked_oop() const { 142 if (!Universe::heap()->is_in_reserved(this)) return false; 143 return mark()->is_unlocked(); 144 } 145 146 #if INCLUDE_CDS_JAVA_HEAP 147 bool oopDesc::is_archive_object(oop p) { 148 return MetaspaceShared::is_archive_object(p); 149 } 150 #endif 151 #endif // PRODUCT 152 153 VerifyOopClosure VerifyOopClosure::verify_oop; 154 155 template <class T> void VerifyOopClosure::do_oop_work(T* p) { 156 oop obj = RawAccess<>::oop_load(p); 157 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)); 158 } 159 160 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); } 161 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); } 162 163 // type test operations that doesn't require inclusion of oop.inline.hpp. 164 bool oopDesc::is_instance_noinline() const { return is_instance(); } 165 bool oopDesc::is_array_noinline() const { return is_array(); } 166 bool oopDesc::is_objArray_noinline() const { return is_objArray(); } 167 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); } 168 169 bool oopDesc::has_klass_gap() { 170 // Only has a klass gap when compressed class pointers are used. 171 return UseCompressedClassPointers; 172 } 173 174 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); } 175 176 void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); } 177 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); } 178 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); } 179 180 address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); } 181 address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 182 183 void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(as_oop(), offset, value); } 184 void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 185 186 Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); } 187 Metadata* oopDesc::metadata_field_raw(int offset) const { return RawAccess<>::load_at(as_oop(), offset); } 188 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); } 189 190 Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 191 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 192 193 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 194 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 195 196 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 197 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 198 199 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 200 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); } 201 202 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 203 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 204 205 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 206 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 207 208 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 209 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 210 211 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 212 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 213 214 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 215 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }