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/*
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* Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/classLoaderData.inline.hpp"
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#include "classfile/symbolTable.hpp"
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#include "jfr/recorder/checkpoint/types/traceid/jfrTraceId.inline.hpp"
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#include "jfr/utilities/jfrTypes.hpp"
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#include "oops/arrayKlass.inline.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/instanceKlass.inline.hpp"
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#include "oops/method.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/orderAccess.inline.hpp"
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#include "runtime/vm_version.hpp"
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#include "runtime/jniHandles.inline.hpp"
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#include "runtime/thread.inline.hpp"
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#include "utilities/debug.hpp"
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// returns updated value
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static traceid atomic_inc(traceid volatile* const dest) {
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assert(VM_Version::supports_cx8(), "invariant");
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traceid compare_value;
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traceid exchange_value;
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do {
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compare_value = OrderAccess::load_acquire(dest);
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exchange_value = compare_value + 1;
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} while (Atomic::cmpxchg(exchange_value, dest, compare_value) != compare_value);
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return exchange_value;
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}
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static traceid next_class_id() {
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static volatile traceid class_id_counter = MaxJfrEventId + 100;
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return atomic_inc(&class_id_counter) << TRACE_ID_SHIFT;
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}
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static traceid next_thread_id() {
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static volatile traceid thread_id_counter = 0;
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return atomic_inc(&thread_id_counter);
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}
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static traceid next_module_id() {
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static volatile traceid module_id_counter = 1;
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return atomic_inc(&module_id_counter) << TRACE_ID_SHIFT;
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}
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static traceid next_package_id() {
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static volatile traceid package_id_counter = 1;
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return atomic_inc(&package_id_counter) << TRACE_ID_SHIFT;
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}
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static traceid next_class_loader_data_id() {
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static volatile traceid cld_id_counter = 1;
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return atomic_inc(&cld_id_counter) << TRACE_ID_SHIFT;
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}
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static bool found_jdk_jfr_event_klass = false;
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static void check_klass(const Klass* klass) {
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assert(klass != NULL, "invariant");
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if (found_jdk_jfr_event_klass) {
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return;
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}
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static const Symbol* jdk_jfr_event_sym = NULL;
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if (jdk_jfr_event_sym == NULL) {
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// setup when loading the first TypeArrayKlass (Universe::genesis) hence single threaded invariant
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jdk_jfr_event_sym = SymbolTable::new_permanent_symbol("jdk/jfr/Event", Thread::current());
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}
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assert(jdk_jfr_event_sym != NULL, "invariant");
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if (jdk_jfr_event_sym == klass->name() && klass->class_loader() == NULL) {
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found_jdk_jfr_event_klass = true;
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JfrTraceId::tag_as_jdk_jfr_event(klass);
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}
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}
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void JfrTraceId::assign(const Klass* klass) {
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assert(klass != NULL, "invariant");
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klass->set_trace_id(next_class_id());
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check_klass(klass);
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const Klass* const super = klass->super();
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if (super == NULL) {
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return;
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}
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if (IS_EVENT_KLASS(super)) {
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tag_as_jdk_jfr_event_sub(klass);
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}
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}
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void JfrTraceId::assign(const ModuleEntry* module) {
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assert(module != NULL, "invariant");
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module->set_trace_id(next_module_id());
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}
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void JfrTraceId::assign(const PackageEntry* package) {
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assert(package != NULL, "invariant");
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package->set_trace_id(next_package_id());
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}
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void JfrTraceId::assign(const ClassLoaderData* cld) {
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assert(cld != NULL, "invariant");
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if (cld->is_anonymous()) {
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cld->set_trace_id(0);
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return;
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}
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cld->set_trace_id(next_class_loader_data_id());
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}
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traceid JfrTraceId::assign_thread_id() {
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return next_thread_id();
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}
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// used by CDS / APPCDS as part of "remove_unshareable_info"
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void JfrTraceId::remove(const Klass* k) {
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assert(k != NULL, "invariant");
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// Mask off and store the event flags.
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// This mechanism will retain the event specific flags
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// in the archive, allowing for event flag restoration
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// when renewing the traceid on klass revival.
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k->set_trace_id(EVENT_FLAGS_MASK(k));
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}
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// used by CDS / APPCDS as part of "restore_unshareable_info"
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void JfrTraceId::restore(const Klass* k) {
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assert(k != NULL, "invariant");
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if (IS_JDK_JFR_EVENT_KLASS(k)) {
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found_jdk_jfr_event_klass = true;
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}
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const traceid event_flags = k->trace_id();
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// get a fresh traceid and restore the original event flags
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k->set_trace_id(next_class_id() | event_flags);
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}
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traceid JfrTraceId::get(jclass jc) {
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assert(jc != NULL, "invariant");
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assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_vm, "invariant");
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const oop my_oop = JNIHandles::resolve(jc);
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assert(my_oop != NULL, "invariant");
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return get(java_lang_Class::as_Klass(my_oop));
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}
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traceid JfrTraceId::use(jclass jc, bool leakp /* false */) {
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assert(jc != NULL, "invariant");
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assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_vm, "invariant");
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const oop my_oop = JNIHandles::resolve(jc);
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assert(my_oop != NULL, "invariant");
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return use(java_lang_Class::as_Klass(my_oop), leakp);
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}
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bool JfrTraceId::in_visible_set(const jclass jc) {
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assert(jc != NULL, "invariant");
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assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_vm, "invariant");
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const oop mirror = JNIHandles::resolve(jc);
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assert(mirror != NULL, "invariant");
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return in_visible_set(java_lang_Class::as_Klass(mirror));
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}
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bool JfrTraceId::in_jdk_jfr_event_hierarchy(const jclass jc) {
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assert(jc != NULL, "invariant");
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const oop mirror = JNIHandles::resolve(jc);
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assert(mirror != NULL, "invariant");
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return in_jdk_jfr_event_hierarchy(java_lang_Class::as_Klass(mirror));
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}
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bool JfrTraceId::is_jdk_jfr_event_sub(const jclass jc) {
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assert(jc != NULL, "invariant");
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const oop mirror = JNIHandles::resolve(jc);
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assert(mirror != NULL, "invariant");
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return is_jdk_jfr_event_sub(java_lang_Class::as_Klass(mirror));
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}
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bool JfrTraceId::is_jdk_jfr_event(const jclass jc) {
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assert(jc != NULL, "invariant");
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const oop mirror = JNIHandles::resolve(jc);
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assert(mirror != NULL, "invariant");
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return is_jdk_jfr_event(java_lang_Class::as_Klass(mirror));
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}
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bool JfrTraceId::is_event_host(const jclass jc) {
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assert(jc != NULL, "invariant");
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const oop mirror = JNIHandles::resolve(jc);
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assert(mirror != NULL, "invariant");
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return is_event_host(java_lang_Class::as_Klass(mirror));
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}
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void JfrTraceId::tag_as_jdk_jfr_event_sub(const jclass jc) {
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assert(jc != NULL, "invariant");
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const oop mirror = JNIHandles::resolve(jc);
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assert(mirror != NULL, "invariant");
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const Klass* const k = java_lang_Class::as_Klass(mirror);
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tag_as_jdk_jfr_event_sub(k);
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assert(IS_JDK_JFR_EVENT_SUBKLASS(k), "invariant");
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}
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void JfrTraceId::tag_as_event_host(const jclass jc) {
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assert(jc != NULL, "invariant");
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const oop mirror = JNIHandles::resolve(jc);
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assert(mirror != NULL, "invariant");
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const Klass* const k = java_lang_Class::as_Klass(mirror);
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tag_as_event_host(k);
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assert(IS_EVENT_HOST_KLASS(k), "invariant");
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}
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