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/access.inline.hpp" 30 #include "oops/oop.inline.hpp" 31 #include "oops/verifyOopClosure.hpp" 32 #include "runtime/handles.inline.hpp" 33 #include "runtime/thread.inline.hpp" 34 #include "utilities/copy.hpp" 35 #if INCLUDE_ALL_GCS 36 #include "gc/g1/g1Allocator.inline.hpp" 37 #endif 38 39 bool always_do_update_barrier = false; 40 41 bool oopDesc::equals(oop o1, oop o2) { 42 return Access<>::equals(o1, o2); 43 } 44 45 void oopDesc::print_on(outputStream* st) const { 46 if (this == NULL) { 47 st->print_cr("NULL"); 48 } else { 49 klass()->oop_print_on(oop(this), st); 50 } 51 } 52 53 void oopDesc::print_address_on(outputStream* st) const { 54 st->print("{" INTPTR_FORMAT "}", p2i(this)); 55 56 } 57 58 void oopDesc::print() { print_on(tty); } 59 60 void oopDesc::print_address() { print_address_on(tty); } 61 62 char* oopDesc::print_string() { 63 stringStream st; 64 print_on(&st); 65 return st.as_string(); 66 } 67 68 void oopDesc::print_value() { 69 print_value_on(tty); 70 } 71 72 char* oopDesc::print_value_string() { 73 char buf[100]; 74 stringStream st(buf, sizeof(buf)); 75 print_value_on(&st); 76 return st.as_string(); 77 } 78 79 void oopDesc::print_value_on(outputStream* st) const { 80 oop obj = oop(this); 81 if (this == NULL) { 82 st->print("NULL"); 83 } else if (java_lang_String::is_instance(obj)) { 84 java_lang_String::print(obj, st); 85 print_address_on(st); 86 } else { 87 klass()->oop_print_value_on(obj, st); 88 } 89 } 90 91 92 void oopDesc::verify_on(outputStream* st) { 93 if (this != NULL) { 94 klass()->oop_verify_on(this, st); 95 } 96 } 97 98 99 void oopDesc::verify() { 100 verify_on(tty); 101 } 102 103 intptr_t oopDesc::slow_identity_hash() { 104 // slow case; we have to acquire the micro lock in order to locate the header 105 Thread* THREAD = Thread::current(); 106 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 107 HandleMark hm(THREAD); 108 Handle object(THREAD, this); 109 return ObjectSynchronizer::identity_hash_value_for(object); 110 } 111 112 // When String table needs to rehash 113 unsigned int oopDesc::new_hash(juint seed) { 114 EXCEPTION_MARK; 115 ResourceMark rm; 116 int length; 117 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD); 118 if (chars != NULL) { 119 // Use alternate hashing algorithm on the string 120 return AltHashing::murmur3_32(seed, chars, length); 121 } else { 122 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash"); 123 return 0; 124 } 125 } 126 127 // used only for asserts and guarantees 128 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) { 129 if (!check_obj_alignment(obj)) return false; 130 if (!Universe::heap()->is_in_reserved(obj)) return false; 131 // obj is aligned and accessible in heap 132 if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false; 133 134 // Header verification: the mark is typically non-NULL. If we're 135 // at a safepoint, it must not be null. 136 // Outside of a safepoint, the header could be changing (for example, 137 // another thread could be inflating a lock on this object). 138 if (ignore_mark_word) { 139 return true; 140 } 141 if (obj->mark() != NULL) { 142 return true; 143 } 144 return !SafepointSynchronize::is_at_safepoint(); 145 } 146 147 // used only for asserts and guarantees 148 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) { 149 return obj == NULL ? true : is_oop(obj, ignore_mark_word); 150 } 151 152 #ifndef PRODUCT 153 // used only for asserts 154 bool oopDesc::is_unlocked_oop() const { 155 if (!Universe::heap()->is_in_reserved(this)) return false; 156 return mark()->is_unlocked(); 157 } 158 #endif // PRODUCT 159 160 VerifyOopClosure VerifyOopClosure::verify_oop; 161 162 template <class T> void VerifyOopClosure::do_oop_work(T* p) { 163 oop obj = RawAccess<>::oop_load(p); 164 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)); 165 } 166 167 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); } 168 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); } 169 170 // type test operations that doesn't require inclusion of oop.inline.hpp. 171 bool oopDesc::is_instance_noinline() const { return is_instance(); } 172 bool oopDesc::is_array_noinline() const { return is_array(); } 173 bool oopDesc::is_objArray_noinline() const { return is_objArray(); } 174 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); } 175 176 bool oopDesc::has_klass_gap() { 177 // Only has a klass gap when compressed class pointers are used. 178 return UseCompressedClassPointers; 179 } 180 181 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); } 182 183 void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); } 184 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); } 185 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); } 186 187 address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); } 188 address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 189 190 void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(as_oop(), offset, value); } 191 void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 192 193 Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); } 194 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); } 195 196 Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 197 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 198 199 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 200 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 201 202 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 203 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 204 205 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 206 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); } 207 208 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 209 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 210 211 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 212 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 213 214 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 215 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 216 217 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 218 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 219 220 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 221 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 222 223 #if INCLUDE_CDS_JAVA_HEAP 224 bool oopDesc::is_archive_object(oop p) { 225 return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p); 226 } 227 #endif