1 /* 2 * Copyright (c) 1997, 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 25 #include "precompiled.hpp" 26 #include "classfile/altHashing.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "memory/resourceArea.hpp" 29 #include "oops/oop.inline.hpp" 30 #include "oops/verifyOopClosure.hpp" 31 #include "runtime/access.inline.hpp" 32 #include "runtime/handles.inline.hpp" 33 #include "runtime/thread.inline.hpp" 34 #include "utilities/copy.hpp" 35 36 bool always_do_update_barrier = false; 37 38 BarrierSet* oopDesc::_bs = NULL; 39 40 void oopDesc::print_on(outputStream* st) const { 41 if (this == NULL) { 42 st->print_cr("NULL"); 43 } else { 44 klass()->oop_print_on(oop(this), st); 45 } 46 } 47 48 void oopDesc::print_address_on(outputStream* st) const { 49 st->print("{" INTPTR_FORMAT "}", p2i(this)); 50 51 } 52 53 void oopDesc::print() { print_on(tty); } 54 55 void oopDesc::print_address() { print_address_on(tty); } 56 57 char* oopDesc::print_string() { 58 stringStream st; 59 print_on(&st); 60 return st.as_string(); 61 } 62 63 void oopDesc::print_value() { 64 print_value_on(tty); 65 } 66 67 char* oopDesc::print_value_string() { 68 char buf[100]; 69 stringStream st(buf, sizeof(buf)); 70 print_value_on(&st); 71 return st.as_string(); 72 } 73 74 void oopDesc::print_value_on(outputStream* st) const { 75 oop obj = oop(this); 76 if (this == NULL) { 77 st->print("NULL"); 78 } else if (java_lang_String::is_instance(obj)) { 79 java_lang_String::print(obj, st); 80 print_address_on(st); 81 } else { 82 klass()->oop_print_value_on(obj, st); 83 } 84 } 85 86 87 void oopDesc::verify_on(outputStream* st) { 88 if (this != NULL) { 89 klass()->oop_verify_on(this, st); 90 } 91 } 92 93 94 void oopDesc::verify() { 95 verify_on(tty); 96 } 97 98 intptr_t oopDesc::slow_identity_hash() { 99 // slow case; we have to acquire the micro lock in order to locate the header 100 Thread* THREAD = Thread::current(); 101 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 102 HandleMark hm(THREAD); 103 Handle object(THREAD, this); 104 return ObjectSynchronizer::identity_hash_value_for(object); 105 } 106 107 // When String table needs to rehash 108 unsigned int oopDesc::new_hash(juint seed) { 109 EXCEPTION_MARK; 110 ResourceMark rm; 111 int length; 112 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD); 113 if (chars != NULL) { 114 // Use alternate hashing algorithm on the string 115 return AltHashing::murmur3_32(seed, chars, length); 116 } else { 117 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash"); 118 return 0; 119 } 120 } 121 122 VerifyOopClosure VerifyOopClosure::verify_oop; 123 124 template <class T> void VerifyOopClosure::do_oop_work(T* p) { 125 oop obj = oopDesc::load_decode_heap_oop(p); 126 guarantee(obj->is_oop_or_null(), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)); 127 } 128 129 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); } 130 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); } 131 132 // type test operations that doesn't require inclusion of oop.inline.hpp. 133 bool oopDesc::is_instance_noinline() const { return is_instance(); } 134 bool oopDesc::is_array_noinline() const { return is_array(); } 135 bool oopDesc::is_objArray_noinline() const { return is_objArray(); } 136 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); } 137 138 bool oopDesc::has_klass_gap() { 139 // Only has a klass gap when compressed class pointers are used. 140 return UseCompressedClassPointers; 141 } 142 143 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(oop_base(), offset); } 144 145 void oopDesc::obj_field_put_raw(int offset, oop value) { BasicAccess<>::oop_store_at(oop_base(), offset, value); } 146 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(oop_base(), offset, value); } 147 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(oop_base(), offset, value); } 148 149 address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(oop_base(), offset); } 150 address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(oop_base(), offset); } 151 152 void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(oop_base(), offset, value); } 153 void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(oop_base(), offset, value); } 154 155 Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(oop_base(), offset); } 156 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(oop_base(), offset, value); } 157 158 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(oop_base(), offset); } 159 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(oop_base(), offset, value); } 160 161 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(oop_base(), offset); } 162 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(oop_base(), offset, value); } 163 164 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(oop_base(), offset); } 165 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(oop_base(), offset, jboolean(value & 1)); } 166 167 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(oop_base(), offset); } 168 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(oop_base(), offset, value); } 169 170 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(oop_base(), offset); } 171 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(oop_base(), offset, value); } 172 173 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(oop_base(), offset); } 174 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(oop_base(), offset, value); } 175 176 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(oop_base(), offset); } 177 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(oop_base(), offset, value); } 178 179 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(oop_base(), offset); } 180 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(oop_base(), offset, value); } 181 182 // These functions are only used to exchange oop fields in instances, 183 // not headers. 184 oop oopDesc::atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest) { 185 return HeapAccess<MO_SEQ_CST>::oop_swap(exchange_value, dest); 186 } 187 188 oop oopDesc::atomic_compare_exchange_oop(oop exchange_value, 189 volatile HeapWord *dest, 190 oop compare_value) { 191 return HeapAccess<MO_SEQ_CST>::oop_cas(exchange_value, dest, compare_value); 192 }