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