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/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_G1GC 36 #include "gc/g1/g1Allocator.inline.hpp" 37 #endif 38 39 bool always_do_update_barrier = false; 40 41 void oopDesc::print_on(outputStream* st) const { 42 if (this == NULL) { 43 st->print_cr("NULL"); 44 } else { 45 klass()->oop_print_on(oop(this), st); 46 } 47 } 48 49 void oopDesc::print_address_on(outputStream* st) const { 50 st->print("{" INTPTR_FORMAT "}", p2i(this)); 51 52 } 53 54 void oopDesc::print() { print_on(tty); } 55 56 void oopDesc::print_address() { print_address_on(tty); } 57 58 char* oopDesc::print_string() { 59 stringStream st; 60 print_on(&st); 61 return st.as_string(); 62 } 63 64 void oopDesc::print_value() { 65 print_value_on(tty); 66 } 67 68 char* oopDesc::print_value_string() { 69 char buf[100]; 70 stringStream st(buf, sizeof(buf)); 71 print_value_on(&st); 72 return st.as_string(); 73 } 74 75 void oopDesc::print_value_on(outputStream* st) const { 76 oop obj = oop(this); 77 if (this == NULL) { 78 st->print("NULL"); 79 } else if (java_lang_String::is_instance(obj)) { 80 java_lang_String::print(obj, st); 81 print_address_on(st); 82 } else { 83 klass()->oop_print_value_on(obj, st); 84 } 85 } 86 87 88 void oopDesc::verify_on(outputStream* st) { 89 if (this != NULL) { 90 klass()->oop_verify_on(this, st); 91 } 92 } 93 94 95 void oopDesc::verify() { 96 verify_on(tty); 97 } 98 99 intptr_t oopDesc::slow_identity_hash() { 100 // slow case; we have to acquire the micro lock in order to locate the header 101 Thread* THREAD = Thread::current(); 102 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 103 HandleMark hm(THREAD); 104 Handle object(THREAD, this); 105 return ObjectSynchronizer::identity_hash_value_for(object); 106 } 107 108 // When String table needs to rehash 109 unsigned int oopDesc::new_hash(juint seed) { 110 EXCEPTION_MARK; 111 ResourceMark rm; 112 int length; 113 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD); 114 if (chars != NULL) { 115 // Use alternate hashing algorithm on the string 116 return AltHashing::murmur3_32(seed, chars, length); 117 } else { 118 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash"); 119 return 0; 120 } 121 } 122 123 // used only for asserts and guarantees 124 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) { 125 if (!Universe::heap()->is_oop(obj)) { 126 return false; 127 } 128 129 // Header verification: the mark is typically non-NULL. If we're 130 // at a safepoint, it must not be null. 131 // Outside of a safepoint, the header could be changing (for example, 132 // another thread could be inflating a lock on this object). 133 if (ignore_mark_word) { 134 return true; 135 } 136 if (obj->mark_raw() != NULL) { 137 return true; 138 } 139 return !SafepointSynchronize::is_at_safepoint(); 140 } 141 142 // used only for asserts and guarantees 143 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) { 144 return obj == NULL ? true : is_oop(obj, ignore_mark_word); 145 } 146 147 #ifndef PRODUCT 148 // used only for asserts 149 bool oopDesc::is_unlocked_oop() const { 150 if (!Universe::heap()->is_in_reserved(this)) return false; 151 return mark()->is_unlocked(); 152 } 153 #endif // PRODUCT 154 155 VerifyOopClosure VerifyOopClosure::verify_oop; 156 157 template <class T> void VerifyOopClosure::do_oop_work(T* p) { 158 oop obj = RawAccess<>::oop_load(p); 159 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)); 160 } 161 162 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); } 163 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); } 164 165 // type test operations that doesn't require inclusion of oop.inline.hpp. 166 bool oopDesc::is_instance_noinline() const { return is_instance(); } 167 bool oopDesc::is_array_noinline() const { return is_array(); } 168 bool oopDesc::is_objArray_noinline() const { return is_objArray(); } 169 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); } 170 171 bool oopDesc::has_klass_gap() { 172 // Only has a klass gap when compressed class pointers are used. 173 return UseCompressedClassPointers; 174 } 175 176 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); } 177 178 void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); } 179 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); } 180 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); } 181 182 address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); } 183 address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 184 185 void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(as_oop(), offset, value); } 186 void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 187 188 Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); } 189 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); } 190 191 Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 192 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 193 194 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 195 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 196 197 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 198 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 199 200 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 201 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); } 202 203 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 204 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 205 206 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 207 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 208 209 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 210 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 211 212 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 213 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 214 215 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); } 216 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); } 217 218 #if INCLUDE_CDS_JAVA_HEAP 219 bool oopDesc::is_archive_object(oop p) { 220 return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p); 221 } 222 #endif