| /* |
| * Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/classLoaderData.inline.hpp" |
| #include "classfile/symbolTable.hpp" |
| #include "jfr/recorder/checkpoint/types/traceid/jfrTraceId.inline.hpp" |
| #include "jfr/utilities/jfrTypes.hpp" |
| #include "oops/arrayKlass.inline.hpp" |
| #include "oops/klass.inline.hpp" |
| #include "oops/instanceKlass.inline.hpp" |
| #include "oops/method.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/vm_version.hpp" |
| #include "runtime/jniHandles.inline.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "utilities/debug.hpp" |
| |
| // returns updated value |
| static traceid atomic_inc(traceid volatile* const dest) { |
| assert(VM_Version::supports_cx8(), "invariant"); |
| traceid compare_value; |
| traceid exchange_value; |
| do { |
| compare_value = *dest; |
| exchange_value = compare_value + 1; |
| } while (Atomic::cmpxchg(exchange_value, dest, compare_value) != compare_value); |
| return exchange_value; |
| } |
| |
| static traceid next_class_id() { |
| static volatile traceid class_id_counter = MaxJfrEventId + 100; |
| return atomic_inc(&class_id_counter) << TRACE_ID_SHIFT; |
| } |
| |
| static traceid next_thread_id() { |
| static volatile traceid thread_id_counter = 0; |
| return atomic_inc(&thread_id_counter); |
| } |
| |
| static traceid next_module_id() { |
| static volatile traceid module_id_counter = 1; |
| return atomic_inc(&module_id_counter) << TRACE_ID_SHIFT; |
| } |
| |
| static traceid next_package_id() { |
| static volatile traceid package_id_counter = 1; |
| return atomic_inc(&package_id_counter) << TRACE_ID_SHIFT; |
| } |
| |
| static traceid next_class_loader_data_id() { |
| static volatile traceid cld_id_counter = 1; |
| return atomic_inc(&cld_id_counter) << TRACE_ID_SHIFT; |
| } |
| |
| static bool found_jdk_internal_event_klass = false; |
| static bool found_jdk_jfr_event_klass = false; |
| |
| static void check_klass(const Klass* klass) { |
| assert(klass != NULL, "invariant"); |
| if (found_jdk_internal_event_klass && found_jdk_jfr_event_klass) { |
| return; |
| } |
| static const Symbol* jdk_internal_event_sym = NULL; |
| if (jdk_internal_event_sym == NULL) { |
| // setup when loading the first TypeArrayKlass (Universe::genesis) hence single threaded invariant |
| jdk_internal_event_sym = SymbolTable::new_permanent_symbol("jdk/internal/event/Event"); |
| } |
| assert(jdk_internal_event_sym != NULL, "invariant"); |
| |
| static const Symbol* jdk_jfr_event_sym = NULL; |
| if (jdk_jfr_event_sym == NULL) { |
| // setup when loading the first TypeArrayKlass (Universe::genesis) hence single threaded invariant |
| jdk_jfr_event_sym = SymbolTable::new_permanent_symbol("jdk/jfr/Event"); |
| } |
| assert(jdk_jfr_event_sym != NULL, "invariant"); |
| const Symbol* const klass_name = klass->name(); |
| |
| if (!found_jdk_internal_event_klass) { |
| if (jdk_internal_event_sym == klass_name && klass->class_loader() == NULL) { |
| found_jdk_internal_event_klass = true; |
| JfrTraceId::tag_as_jdk_jfr_event(klass); |
| return; |
| } |
| } |
| |
| if (!found_jdk_jfr_event_klass) { |
| if (jdk_jfr_event_sym == klass_name && klass->class_loader() == NULL) { |
| found_jdk_jfr_event_klass = true; |
| JfrTraceId::tag_as_jdk_jfr_event(klass); |
| return; |
| } |
| } |
| } |
| |
| void JfrTraceId::assign(const Klass* klass) { |
| assert(klass != NULL, "invariant"); |
| klass->set_trace_id(next_class_id()); |
| check_klass(klass); |
| const Klass* const super = klass->super(); |
| if (super == NULL) { |
| return; |
| } |
| if (IS_EVENT_KLASS(super)) { |
| tag_as_jdk_jfr_event_sub(klass); |
| } |
| } |
| |
| void JfrTraceId::assign(const ModuleEntry* module) { |
| assert(module != NULL, "invariant"); |
| module->set_trace_id(next_module_id()); |
| } |
| |
| void JfrTraceId::assign(const PackageEntry* package) { |
| assert(package != NULL, "invariant"); |
| package->set_trace_id(next_package_id()); |
| } |
| |
| void JfrTraceId::assign(const ClassLoaderData* cld) { |
| assert(cld != NULL, "invariant"); |
| if (cld->is_unsafe_anonymous()) { |
| cld->set_trace_id(0); |
| return; |
| } |
| cld->set_trace_id(next_class_loader_data_id()); |
| } |
| |
| traceid JfrTraceId::assign_thread_id() { |
| return next_thread_id(); |
| } |
| |
| // used by CDS / APPCDS as part of "remove_unshareable_info" |
| void JfrTraceId::remove(const Klass* k) { |
| assert(k != NULL, "invariant"); |
| // Mask off and store the event flags. |
| // This mechanism will retain the event specific flags |
| // in the archive, allowing for event flag restoration |
| // when renewing the traceid on klass revival. |
| k->set_trace_id(EVENT_KLASS_MASK(k)); |
| } |
| |
| // used by CDS / APPCDS as part of "restore_unshareable_info" |
| void JfrTraceId::restore(const Klass* k) { |
| assert(k != NULL, "invariant"); |
| if (IS_JDK_JFR_EVENT_KLASS(k)) { |
| found_jdk_jfr_event_klass = true; |
| } |
| const traceid event_flags = k->trace_id(); |
| // get a fresh traceid and restore the original event flags |
| k->set_trace_id(next_class_id() | event_flags); |
| } |
| |
| traceid JfrTraceId::get(jclass jc) { |
| assert(jc != NULL, "invariant"); |
| assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_vm, "invariant"); |
| const oop my_oop = JNIHandles::resolve(jc); |
| assert(my_oop != NULL, "invariant"); |
| return get(java_lang_Class::as_Klass(my_oop)); |
| } |
| |
| traceid JfrTraceId::use(jclass jc) { |
| assert(jc != NULL, "invariant"); |
| assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_vm, "invariant"); |
| const oop my_oop = JNIHandles::resolve(jc); |
| assert(my_oop != NULL, "invariant"); |
| return use(java_lang_Class::as_Klass(my_oop)); |
| } |
| |
| bool JfrTraceId::in_visible_set(const jclass jc) { |
| assert(jc != NULL, "invariant"); |
| assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_vm, "invariant"); |
| const oop mirror = JNIHandles::resolve(jc); |
| assert(mirror != NULL, "invariant"); |
| return in_visible_set(java_lang_Class::as_Klass(mirror)); |
| } |
| |
| bool JfrTraceId::in_jdk_jfr_event_hierarchy(const jclass jc) { |
| assert(jc != NULL, "invariant"); |
| const oop mirror = JNIHandles::resolve(jc); |
| assert(mirror != NULL, "invariant"); |
| return in_jdk_jfr_event_hierarchy(java_lang_Class::as_Klass(mirror)); |
| } |
| |
| bool JfrTraceId::is_jdk_jfr_event_sub(const jclass jc) { |
| assert(jc != NULL, "invariant"); |
| const oop mirror = JNIHandles::resolve(jc); |
| assert(mirror != NULL, "invariant"); |
| return is_jdk_jfr_event_sub(java_lang_Class::as_Klass(mirror)); |
| } |
| |
| bool JfrTraceId::is_jdk_jfr_event(const jclass jc) { |
| assert(jc != NULL, "invariant"); |
| const oop mirror = JNIHandles::resolve(jc); |
| assert(mirror != NULL, "invariant"); |
| return is_jdk_jfr_event(java_lang_Class::as_Klass(mirror)); |
| } |
| |
| bool JfrTraceId::is_event_host(const jclass jc) { |
| assert(jc != NULL, "invariant"); |
| const oop mirror = JNIHandles::resolve(jc); |
| assert(mirror != NULL, "invariant"); |
| return is_event_host(java_lang_Class::as_Klass(mirror)); |
| } |
| |
| void JfrTraceId::tag_as_jdk_jfr_event_sub(const jclass jc) { |
| assert(jc != NULL, "invariant"); |
| const oop mirror = JNIHandles::resolve(jc); |
| assert(mirror != NULL, "invariant"); |
| const Klass* const k = java_lang_Class::as_Klass(mirror); |
| tag_as_jdk_jfr_event_sub(k); |
| assert(IS_JDK_JFR_EVENT_SUBKLASS(k), "invariant"); |
| } |
| |
| void JfrTraceId::tag_as_event_host(const jclass jc) { |
| assert(jc != NULL, "invariant"); |
| const oop mirror = JNIHandles::resolve(jc); |
| assert(mirror != NULL, "invariant"); |
| const Klass* const k = java_lang_Class::as_Klass(mirror); |
| tag_as_event_host(k); |
| assert(IS_EVENT_HOST_KLASS(k), "invariant"); |
| } |