1 /* 2 * Copyright (c) 2011, 2019, 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/classLoaderData.inline.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "jfr/recorder/checkpoint/types/traceid/jfrTraceId.inline.hpp" 29 #include "jfr/utilities/jfrTypes.hpp" 30 #include "oops/arrayKlass.inline.hpp" 31 #include "oops/klass.inline.hpp" 32 #include "oops/instanceKlass.inline.hpp" 33 #include "oops/method.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "runtime/atomic.hpp" 36 #include "runtime/vm_version.hpp" 37 #include "runtime/jniHandles.inline.hpp" 38 #include "runtime/thread.inline.hpp" 39 #include "utilities/debug.hpp" 40 41 // returns updated value 42 static traceid atomic_inc(traceid volatile* const dest) { 43 assert(VM_Version::supports_cx8(), "invariant"); 44 traceid compare_value; 45 traceid exchange_value; 46 do { 47 compare_value = *dest; 48 exchange_value = compare_value + 1; 49 } while (Atomic::cmpxchg(dest, compare_value, exchange_value) != compare_value); 50 return exchange_value; 51 } 52 53 static traceid next_class_id() { 54 static volatile traceid class_id_counter = MaxJfrEventId + 100; 55 return atomic_inc(&class_id_counter) << TRACE_ID_SHIFT; 56 } 57 58 static traceid next_thread_id() { 59 static volatile traceid thread_id_counter = 0; 60 return atomic_inc(&thread_id_counter); 61 } 62 63 static traceid next_module_id() { 64 static volatile traceid module_id_counter = 1; 65 return atomic_inc(&module_id_counter) << TRACE_ID_SHIFT; 66 } 67 68 static traceid next_package_id() { 69 static volatile traceid package_id_counter = 1; 70 return atomic_inc(&package_id_counter) << TRACE_ID_SHIFT; 71 } 72 73 static traceid next_class_loader_data_id() { 74 static volatile traceid cld_id_counter = 1; 75 return atomic_inc(&cld_id_counter) << TRACE_ID_SHIFT; 76 } 77 78 static bool found_jdk_internal_event_klass = false; 79 static bool found_jdk_jfr_event_klass = false; 80 81 static void check_klass(const Klass* klass) { 82 assert(klass != NULL, "invariant"); 83 if (found_jdk_internal_event_klass && found_jdk_jfr_event_klass) { 84 return; 85 } 86 static const Symbol* jdk_internal_event_sym = NULL; 87 if (jdk_internal_event_sym == NULL) { 88 // setup when loading the first TypeArrayKlass (Universe::genesis) hence single threaded invariant 89 jdk_internal_event_sym = SymbolTable::new_permanent_symbol("jdk/internal/event/Event"); 90 } 91 assert(jdk_internal_event_sym != NULL, "invariant"); 92 93 static const Symbol* jdk_jfr_event_sym = NULL; 94 if (jdk_jfr_event_sym == NULL) { 95 // setup when loading the first TypeArrayKlass (Universe::genesis) hence single threaded invariant 96 jdk_jfr_event_sym = SymbolTable::new_permanent_symbol("jdk/jfr/Event"); 97 } 98 assert(jdk_jfr_event_sym != NULL, "invariant"); 99 const Symbol* const klass_name = klass->name(); 100 101 if (!found_jdk_internal_event_klass) { 102 if (jdk_internal_event_sym == klass_name && klass->class_loader() == NULL) { 103 found_jdk_internal_event_klass = true; 104 JfrTraceId::tag_as_jdk_jfr_event(klass); 105 return; 106 } 107 } 108 109 if (!found_jdk_jfr_event_klass) { 110 if (jdk_jfr_event_sym == klass_name && klass->class_loader() == NULL) { 111 found_jdk_jfr_event_klass = true; 112 JfrTraceId::tag_as_jdk_jfr_event(klass); 113 return; 114 } 115 } 116 } 117 118 void JfrTraceId::assign(const Klass* klass) { 119 assert(klass != NULL, "invariant"); 120 klass->set_trace_id(next_class_id()); 121 check_klass(klass); 122 const Klass* const super = klass->super(); 123 if (super == NULL) { 124 return; 125 } 126 if (IS_EVENT_KLASS(super)) { 127 tag_as_jdk_jfr_event_sub(klass); 128 } 129 } 130 131 void JfrTraceId::assign(const ModuleEntry* module) { 132 assert(module != NULL, "invariant"); 133 module->set_trace_id(next_module_id()); 134 } 135 136 void JfrTraceId::assign(const PackageEntry* package) { 137 assert(package != NULL, "invariant"); 138 package->set_trace_id(next_package_id()); 139 } 140 141 void JfrTraceId::assign(const ClassLoaderData* cld) { 142 assert(cld != NULL, "invariant"); 143 if (cld->is_unsafe_anonymous()) { 144 cld->set_trace_id(0); 145 return; 146 } 147 cld->set_trace_id(next_class_loader_data_id()); 148 } 149 150 traceid JfrTraceId::assign_thread_id() { 151 return next_thread_id(); 152 } 153 154 // used by CDS / APPCDS as part of "remove_unshareable_info" 155 void JfrTraceId::remove(const Klass* k) { 156 assert(k != NULL, "invariant"); 157 // Mask off and store the event flags. 158 // This mechanism will retain the event specific flags 159 // in the archive, allowing for event flag restoration 160 // when renewing the traceid on klass revival. 161 k->set_trace_id(EVENT_KLASS_MASK(k)); 162 } 163 164 // used by CDS / APPCDS as part of "restore_unshareable_info" 165 void JfrTraceId::restore(const Klass* k) { 166 assert(k != NULL, "invariant"); 167 if (IS_JDK_JFR_EVENT_KLASS(k)) { 168 found_jdk_jfr_event_klass = true; 169 } 170 const traceid event_flags = k->trace_id(); 171 // get a fresh traceid and restore the original event flags 172 k->set_trace_id(next_class_id() | event_flags); 173 } 174 175 traceid JfrTraceId::get(jclass jc) { 176 assert(jc != NULL, "invariant"); 177 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_vm, "invariant"); 178 const oop my_oop = JNIHandles::resolve(jc); 179 assert(my_oop != NULL, "invariant"); 180 return get(java_lang_Class::as_Klass(my_oop)); 181 } 182 183 traceid JfrTraceId::use(jclass jc) { 184 assert(jc != NULL, "invariant"); 185 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_vm, "invariant"); 186 const oop my_oop = JNIHandles::resolve(jc); 187 assert(my_oop != NULL, "invariant"); 188 return use(java_lang_Class::as_Klass(my_oop)); 189 } 190 191 bool JfrTraceId::in_visible_set(const jclass jc) { 192 assert(jc != NULL, "invariant"); 193 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_vm, "invariant"); 194 const oop mirror = JNIHandles::resolve(jc); 195 assert(mirror != NULL, "invariant"); 196 return in_visible_set(java_lang_Class::as_Klass(mirror)); 197 } 198 199 bool JfrTraceId::in_jdk_jfr_event_hierarchy(const jclass jc) { 200 assert(jc != NULL, "invariant"); 201 const oop mirror = JNIHandles::resolve(jc); 202 assert(mirror != NULL, "invariant"); 203 return in_jdk_jfr_event_hierarchy(java_lang_Class::as_Klass(mirror)); 204 } 205 206 bool JfrTraceId::is_jdk_jfr_event_sub(const jclass jc) { 207 assert(jc != NULL, "invariant"); 208 const oop mirror = JNIHandles::resolve(jc); 209 assert(mirror != NULL, "invariant"); 210 return is_jdk_jfr_event_sub(java_lang_Class::as_Klass(mirror)); 211 } 212 213 bool JfrTraceId::is_jdk_jfr_event(const jclass jc) { 214 assert(jc != NULL, "invariant"); 215 const oop mirror = JNIHandles::resolve(jc); 216 assert(mirror != NULL, "invariant"); 217 return is_jdk_jfr_event(java_lang_Class::as_Klass(mirror)); 218 } 219 220 bool JfrTraceId::is_event_host(const jclass jc) { 221 assert(jc != NULL, "invariant"); 222 const oop mirror = JNIHandles::resolve(jc); 223 assert(mirror != NULL, "invariant"); 224 return is_event_host(java_lang_Class::as_Klass(mirror)); 225 } 226 227 void JfrTraceId::tag_as_jdk_jfr_event_sub(const jclass jc) { 228 assert(jc != NULL, "invariant"); 229 const oop mirror = JNIHandles::resolve(jc); 230 assert(mirror != NULL, "invariant"); 231 const Klass* const k = java_lang_Class::as_Klass(mirror); 232 tag_as_jdk_jfr_event_sub(k); 233 assert(IS_JDK_JFR_EVENT_SUBKLASS(k), "invariant"); 234 } 235 236 void JfrTraceId::tag_as_event_host(const jclass jc) { 237 assert(jc != NULL, "invariant"); 238 const oop mirror = JNIHandles::resolve(jc); 239 assert(mirror != NULL, "invariant"); 240 const Klass* const k = java_lang_Class::as_Klass(mirror); 241 tag_as_event_host(k); 242 assert(IS_EVENT_HOST_KLASS(k), "invariant"); 243 }