JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2014, 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 "jni.h"
#include "jvm.h"
#include "jfr/jfr.hpp"
#include "jfr/jfrEvents.hpp"
#include "jfr/periodic/sampling/jfrThreadSampler.hpp"
#include "jfr/recorder/jfrEventSetting.hpp"
#include "jfr/recorder/jfrRecorder.hpp"
#include "jfr/recorder/checkpoint/jfrMetadataEvent.hpp"
#include "jfr/recorder/checkpoint/types/traceid/jfrTraceId.inline.hpp"
#include "jfr/recorder/repository/jfrRepository.hpp"
#include "jfr/recorder/repository/jfrChunkRotation.hpp"
#include "jfr/recorder/repository/jfrChunkWriter.hpp"
#include "jfr/recorder/service/jfrOptionSet.hpp"
#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"
#include "jfr/recorder/stringpool/jfrStringPool.hpp"
#include "jfr/jni/jfrGetAllEventClasses.hpp"
#include "jfr/jni/jfrJavaSupport.hpp"
#include "jfr/jni/jfrJniMethodRegistration.hpp"
#include "jfr/instrumentation/jfrEventClassTransformer.hpp"
#include "jfr/instrumentation/jfrJvmtiAgent.hpp"
#include "jfr/leakprofiler/leakProfiler.hpp"
#include "jfr/utilities/jfrJavaLog.hpp"
#include "jfr/utilities/jfrTimeConverter.hpp"
#include "jfr/utilities/jfrTime.hpp"
#include "jfr/writers/jfrJavaEventWriter.hpp"
#include "jfrfiles/jfrPeriodic.hpp"
#include "logging/log.hpp"
#include "memory/resourceArea.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/os.hpp"
#include "runtime/thread.hpp"
#include "utilities/debug.hpp"

#define NO_TRANSITION(result_type, header) extern "C" { result_type JNICALL header {
#define NO_TRANSITION_END } }

/*
 * NO_TRANSITION entries
 *
 * Thread remains _thread_in_native
 */

NO_TRANSITION(void, jfr_register_natives(JNIEnv* env, jclass jvmclass))
  JfrJniMethodRegistration register_native_methods(env);
NO_TRANSITION_END

NO_TRANSITION(jboolean, jfr_is_enabled())
  return Jfr::is_enabled() ? JNI_TRUE : JNI_FALSE;
NO_TRANSITION_END

NO_TRANSITION(jboolean, jfr_is_disabled())
  return Jfr::is_disabled() ? JNI_TRUE : JNI_FALSE;
NO_TRANSITION_END

NO_TRANSITION(jboolean, jfr_is_started())
  return JfrRecorder::is_created() ? JNI_TRUE : JNI_FALSE;
NO_TRANSITION_END

NO_TRANSITION(jstring, jfr_get_pid(JNIEnv* env, jobject jvm))
  char pid_buf[32] = { 0 };
  jio_snprintf(pid_buf, sizeof(pid_buf), "%d", os::current_process_id());
  jstring pid_string = env->NewStringUTF(pid_buf);
  return pid_string; // exception pending if NULL
NO_TRANSITION_END

NO_TRANSITION(jlong, jfr_elapsed_frequency(JNIEnv* env, jobject jvm))
  return JfrTime::frequency();
NO_TRANSITION_END

NO_TRANSITION(jlong, jfr_elapsed_counter(JNIEnv* env, jobject jvm))
  return JfrTicks::now();
NO_TRANSITION_END

NO_TRANSITION(void, jfr_retransform_classes(JNIEnv* env, jobject jvm, jobjectArray classes))
  JfrJvmtiAgent::retransform_classes(env, classes, JavaThread::thread_from_jni_environment(env));
NO_TRANSITION_END

NO_TRANSITION(void, jfr_set_enabled(JNIEnv* env, jobject jvm, jlong event_type_id, jboolean enabled))
  JfrEventSetting::set_enabled(event_type_id, JNI_TRUE == enabled);
  if (EventOldObjectSample::eventId == event_type_id) {
    ThreadInVMfromNative transition(JavaThread::thread_from_jni_environment(env));
    if (JNI_TRUE == enabled) {
      LeakProfiler::start(JfrOptionSet::old_object_queue_size());
    } else {
      LeakProfiler::stop();
    }
  }
NO_TRANSITION_END

NO_TRANSITION(void, jfr_set_file_notification(JNIEnv* env, jobject jvm, jlong threshold))
  JfrChunkRotation::set_threshold(threshold);
NO_TRANSITION_END

NO_TRANSITION(void, jfr_set_sample_threads(JNIEnv* env, jobject jvm, jboolean sampleThreads))
  JfrOptionSet::set_sample_threads(sampleThreads);
NO_TRANSITION_END

NO_TRANSITION(void, jfr_set_stack_depth(JNIEnv* env, jobject jvm, jint depth))
  JfrOptionSet::set_stackdepth((jlong)depth);
NO_TRANSITION_END

NO_TRANSITION(void, jfr_set_stacktrace_enabled(JNIEnv* env, jobject jvm, jlong event_type_id, jboolean enabled))
  JfrEventSetting::set_stacktrace(event_type_id, JNI_TRUE == enabled);
NO_TRANSITION_END

NO_TRANSITION(void, jfr_set_global_buffer_count(JNIEnv* env, jobject jvm, jlong count))
  JfrOptionSet::set_num_global_buffers(count);
NO_TRANSITION_END

NO_TRANSITION(void, jfr_set_global_buffer_size(JNIEnv* env, jobject jvm, jlong size))
JfrOptionSet::set_global_buffer_size(size);
NO_TRANSITION_END

NO_TRANSITION(void, jfr_set_thread_buffer_size(JNIEnv* env, jobject jvm, jlong size))
  JfrOptionSet::set_thread_buffer_size(size);
NO_TRANSITION_END

NO_TRANSITION(void, jfr_set_memory_size(JNIEnv* env, jobject jvm, jlong size))
  JfrOptionSet::set_memory_size(size);
NO_TRANSITION_END

NO_TRANSITION(jboolean, jfr_set_threshold(JNIEnv* env, jobject jvm, jlong event_type_id, jlong thresholdTicks))
  return JfrEventSetting::set_threshold(event_type_id, thresholdTicks) ? JNI_TRUE : JNI_FALSE;
NO_TRANSITION_END

NO_TRANSITION(jboolean, jfr_allow_event_retransforms(JNIEnv* env, jobject jvm))
  return JfrOptionSet::allow_event_retransforms() ? JNI_TRUE : JNI_FALSE;
NO_TRANSITION_END

NO_TRANSITION(jboolean, jfr_is_available(JNIEnv* env, jclass jvm))
  return !Jfr::is_disabled() ? JNI_TRUE : JNI_FALSE;
NO_TRANSITION_END

NO_TRANSITION(jlong, jfr_get_epoch_address(JNIEnv* env, jobject jvm))
  return JfrTraceIdEpoch::epoch_address();
NO_TRANSITION_END

NO_TRANSITION(jlong, jfr_get_unloaded_event_classes_count(JNIEnv* env, jobject jvm))
  return JfrEventClasses::unloaded_event_classes_count();
NO_TRANSITION_END

NO_TRANSITION(jdouble, jfr_time_conv_factor(JNIEnv* env, jobject jvm))
  return (jdouble)JfrTimeConverter::nano_to_counter_multiplier();
NO_TRANSITION_END

NO_TRANSITION(jboolean, jfr_set_cutoff(JNIEnv* env, jobject jvm, jlong event_type_id, jlong cutoff_ticks))
  return JfrEventSetting::set_cutoff(event_type_id, cutoff_ticks) ? JNI_TRUE : JNI_FALSE;
NO_TRANSITION_END

NO_TRANSITION(jboolean, jfr_should_rotate_disk(JNIEnv* env, jobject jvm))
  return JfrChunkRotation::should_rotate() ? JNI_TRUE : JNI_FALSE;
NO_TRANSITION_END

/*
 * JVM_ENTRY_NO_ENV entries
 *
 * Transitions:
 *   Entry: _thread_in_native -> _thread_in_vm
 *   Exit:  _thread_in_vm -> _thread_in_native
 *
 * Current JavaThread available as "thread" variable
 */

JVM_ENTRY_NO_ENV(jboolean, jfr_create_jfr(JNIEnv* env, jobject jvm, jboolean simulate_failure))
  if (JfrRecorder::is_created()) {
    return JNI_TRUE;
  }
  if (!JfrRecorder::create(simulate_failure == JNI_TRUE)) {
    if (!thread->has_pending_exception()) {
      JfrJavaSupport::throw_illegal_state_exception("Unable to start Jfr", thread);
    }
    return JNI_FALSE;
  }
  return JNI_TRUE;
JVM_END

JVM_ENTRY_NO_ENV(jboolean, jfr_destroy_jfr(JNIEnv* env, jobject jvm))
  JfrRecorder::destroy();
  return JNI_TRUE;
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_begin_recording(JNIEnv* env, jobject jvm))
  if (JfrRecorder::is_recording()) {
    return;
  }
  JfrRecorder::start_recording();
JVM_END

JVM_ENTRY_NO_ENV(jboolean, jfr_is_recording(JNIEnv * env, jobject jvm))
  return JfrRecorder::is_recording() ? JNI_TRUE : JNI_FALSE;
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_end_recording(JNIEnv* env, jobject jvm))
  if (!JfrRecorder::is_recording()) {
    return;
  }
  JfrRecorder::stop_recording();
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_mark_chunk_final(JNIEnv * env, jobject jvm))
  JfrRepository::mark_chunk_final();
JVM_END

JVM_ENTRY_NO_ENV(jboolean, jfr_emit_event(JNIEnv* env, jobject jvm, jlong eventTypeId, jlong timeStamp, jlong when))
  JfrPeriodicEventSet::requestEvent((JfrEventId)eventTypeId);
  return thread->has_pending_exception() ? JNI_FALSE : JNI_TRUE;
JVM_END

JVM_ENTRY_NO_ENV(jobject, jfr_get_all_event_classes(JNIEnv* env, jobject jvm))
  return JfrEventClasses::get_all_event_classes(thread);
JVM_END

JVM_ENTRY_NO_ENV(jlong, jfr_class_id(JNIEnv* env, jclass jvm, jclass jc))
  return JfrTraceId::use(jc);
JVM_END

JVM_ENTRY_NO_ENV(jlong, jfr_stacktrace_id(JNIEnv* env, jobject jvm, jint skip))
  return JfrStackTraceRepository::record(thread, skip);
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_log(JNIEnv* env, jobject jvm, jint tag_set, jint level, jstring message))
  JfrJavaLog::log(tag_set, level, message, thread);
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_subscribe_log_level(JNIEnv* env, jobject jvm, jobject log_tag, jint id))
  JfrJavaLog::subscribe_log_level(log_tag, id, thread);
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_set_output(JNIEnv* env, jobject jvm, jstring path))
  JfrRepository::set_chunk_path(path, thread);
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_set_method_sampling_interval(JNIEnv* env, jobject jvm, jlong type, jlong intervalMillis))
  if (intervalMillis < 0) {
    intervalMillis = 0;
  }
  JfrEventId typed_event_id = (JfrEventId)type;
  assert(EventExecutionSample::eventId == typed_event_id || EventNativeMethodSample::eventId == typed_event_id, "invariant");
  if (intervalMillis > 0) {
    JfrEventSetting::set_enabled(typed_event_id, true); // ensure sampling event is enabled
  }
  if (EventExecutionSample::eventId == type) {
    JfrThreadSampling::set_java_sample_interval(intervalMillis);
  } else {
    JfrThreadSampling::set_native_sample_interval(intervalMillis);
  }
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_store_metadata_descriptor(JNIEnv* env, jobject jvm, jbyteArray descriptor))
  JfrMetadataEvent::update(descriptor);
JVM_END

// trace thread id for a thread object
JVM_ENTRY_NO_ENV(jlong, jfr_id_for_thread(JNIEnv* env, jobject jvm, jobject t))
  return JfrJavaSupport::jfr_thread_id(t);
JVM_END

JVM_ENTRY_NO_ENV(jobject, jfr_get_event_writer(JNIEnv* env, jclass cls))
  return JfrJavaEventWriter::event_writer(thread);
JVM_END

JVM_ENTRY_NO_ENV(jobject, jfr_new_event_writer(JNIEnv* env, jclass cls))
  return JfrJavaEventWriter::new_event_writer(thread);
JVM_END

JVM_ENTRY_NO_ENV(jboolean, jfr_event_writer_flush(JNIEnv* env, jclass cls, jobject writer, jint used_size, jint requested_size))
  return JfrJavaEventWriter::flush(writer, used_size, requested_size, thread);
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_flush(JNIEnv* env, jobject jvm))
  JfrRepository::flush(thread);
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_set_repository_location(JNIEnv* env, jobject repo, jstring location))
  return JfrRepository::set_path(location, thread);
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_uncaught_exception(JNIEnv* env, jobject jvm, jobject t, jthrowable throwable))
  JfrJavaSupport::uncaught_exception(throwable, thread);
JVM_END

JVM_ENTRY_NO_ENV(void, jfr_abort(JNIEnv* env, jobject jvm, jstring errorMsg))

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