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JFRChunkWriter.cpp
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/*******************************************************************************
* Copyright IBM Corp. and others 2024
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
#include "JFRUtils.hpp"
#include "vm_internal.h"
#if defined(J9VM_OPT_JFR)
#include "JFRChunkWriter.hpp"
#include "JFRConstantPoolTypes.hpp"
void
VM_JFRChunkWriter::writeJFRHeader()
{
_bufferWriter->setCursor(_jfrHeaderCursor);
/* Magic number "FLR\0" in ASCII */
_bufferWriter->writeU32(0x464c5200); // 0
/* Major and Minor version numbers */
_bufferWriter->writeU16(2); // 4
_bufferWriter->writeU16(1);
/* chunk size */
_bufferWriter->writeU64(_bufferWriter->getSize()); // 8
/* checkpoint offset */
_bufferWriter->writeU64(_bufferWriter->getFileOffsetFromStart(_checkPointEventOffset)); // 16
/* metadata offset */
_bufferWriter->writeU64(_bufferWriter->getFileOffsetFromStart(_metadataOffset)); // 24
/* start time */
_bufferWriter->writeU64(_vm->jfrState.chunkStartTime); // 32
/* duration */
_bufferWriter->writeU64(0); // 40
/* start ticks */
_bufferWriter->writeU64(_vm->jfrState.chunkStartTicks); // 48
/* ticks per second - 1000_000_000 ticks per second means that we are reporting nanosecond timestamps */
_bufferWriter->writeU64(1000000000); // 56
/* file state or generation */
_bufferWriter->writeU8(0); // 64 // TODO ???
/* pad */
_bufferWriter->writeU16(0); // 65
U_8 flags = JFR_HEADER_SPECIALFLAGS_COMPRESSED_INTS;
if (_finalWrite) {
flags |= JFR_HEADER_SPECIALFLAGS_LAST_CHUNK;
}
_bufferWriter->writeU8(flags);
}
U_8 *
VM_JFRChunkWriter::writeJFRMetadata()
{
/* reserve metadata size field */
U_8 *dataStart = reserveEventSize();
if (_debug) {
j9tty_printf(
PORTLIB,
"Metadata frame start offset = 0x%llX\n",
_bufferWriter->getFileOffsetFromStart(dataStart));
}
/* write metadata header */
_bufferWriter->writeU8(EventMetadata);
/* start time */
_bufferWriter->writeLEB128(VM_JFRUtils::getCurrentTimeNanos(privatePortLibrary, _buildResult));
/* duration */
_bufferWriter->writeLEB128((U_64)0);
/* metadata ID */
_bufferWriter->writeLEB128((U_64)METADATA_ID);
U_8 *blobStart = _bufferWriter->getCursor();
if (_debug) {
j9tty_printf(
PORTLIB,
"Metadata blob start offset = 0x%llX, size = %zu\n",
_bufferWriter->getFileOffsetFromStart(_bufferWriter->getCursor()),
_vm->jfrState.metaDataBlobFileSize);
}
/* metadata blob file */
_bufferWriter->writeData(_vm->jfrState.metaDataBlobFile, _vm->jfrState.metaDataBlobFileSize);
if (_debug) {
j9tty_printf(
PORTLIB,
"Metadata blob size from LEB128 = %llu\n",
VM_BufferWriter::convertFromLEB128ToU64(blobStart));
}
/* add metadata size */
writeEventSize(dataStart);
if (_debug) {
j9tty_printf(
PORTLIB,
"Metadata size = %zu, fromLEB128 = %llu\n",
_bufferWriter->getCursor() - dataStart,
VM_BufferWriter::convertFromLEB128ToU64(dataStart));
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeCheckpointEventHeader(CheckpointTypeMask typeMask, U_32 cpCount)
{
/* write delta offset in previous checkpoint event */
if (NULL != _previousCheckpointDelta) {
_bufferWriter->writeLEB128PaddedU72(
_previousCheckpointDelta,
_bufferWriter->getFileOffset(_bufferWriter->getCursor(), _lastDataStart));
}
/* reserve size field */
U_8 *dataStart = reserveEventSize();
_lastDataStart = dataStart;
if (_debug) {
j9tty_printf(
PORTLIB,
"Checkpoint event frame start offset = 0x%llX\n",
_bufferWriter->getFileOffsetFromStart(dataStart));
}
/* write checkpoint header */
_bufferWriter->writeU8(EventCheckpoint);
/* start time */
_bufferWriter->writeLEB128(j9time_nano_time());
/* duration */
_bufferWriter->writeLEB128((U_64)0);
/* reserve delta offset to next checkpoint event */
_previousCheckpointDelta = _bufferWriter->getCursor();
_bufferWriter->writeLEB128PaddedU72(0);
if (_debug) {
j9tty_printf(
PORTLIB,
"next pointer=0x%llX val=%llu\n",
_bufferWriter->getFileOffsetFromStart(_previousCheckpointDelta),
VM_BufferWriter::convertFromLEB128ToU64(_previousCheckpointDelta));
}
/* type mask */
_bufferWriter->writeU8(typeMask);
/* constant pool count */
_bufferWriter->writeLEB128(cpCount);
return dataStart;
}
void
VM_JFRChunkWriter::writeUTF8String(const J9UTF8 *string)
{
if (NULL == string) {
_bufferWriter->writeLEB128(NullString);
} else {
writeUTF8String(J9UTF8_DATA(string), J9UTF8_LENGTH(string));
}
}
void
VM_JFRChunkWriter::writeUTF8String(const U_8 *data, UDATA len)
{
_bufferWriter->writeLEB128(UTF8);
_bufferWriter->writeLEB128(len);
_bufferWriter->writeData(data, len);
}
void
VM_JFRChunkWriter::writeStringLiteral(const char *string)
{
if (NULL == string) {
_bufferWriter->writeLEB128(NullString);
} else {
const UDATA length = strlen(string);
writeUTF8String((U_8 *)string, length);
}
}
U_8 *
VM_JFRChunkWriter::writeThreadStateCheckpointEvent()
{
U_8 *dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(ThreadStateID);
/* number of states */
_bufferWriter->writeLEB128(THREADSTATE_COUNT);
for (int i = 0; i < THREADSTATE_COUNT; i++) {
/* constant index */
_bufferWriter->writeLEB128(i);
/* string encoding */
_bufferWriter->writeLEB128(UTF8);
/* string length */
UDATA len = strlen(threadStateNames[i]);
_bufferWriter->writeLEB128(len);
/* write string */ // need to think about UTF8 enconding
_bufferWriter->writeData((U_8 *)threadStateNames[i], len);
}
/* write size */
writeEventSize(dataStart);
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writePackageCheckpointEvent()
{
U_8 *dataStart = NULL;
if (_constantPoolTypes.getPackageCount() > 0) {
dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(PackageID);
/* number of states */
_bufferWriter->writeLEB128(_constantPoolTypes.getPackageCount());
PackageEntry *entry = _constantPoolTypes.getPackageEntry();
while (NULL != entry) {
/* write index */
_bufferWriter->writeLEB128(entry->index);
/* name index */
_bufferWriter->writeLEB128(_constantPoolTypes.getStringUTF8Count() + entry->index);
/* module index */
_bufferWriter->writeLEB128(entry->moduleIndex);
/* exported index */
_bufferWriter->writeBoolean(entry->exported);
entry = entry->next;
}
/* write size */
writeEventSize(dataStart);
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeMethodCheckpointEvent()
{
U_8 *dataStart = NULL;
if (_constantPoolTypes.getMethodCount() > 0) {
dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(MethodID);
/* number of states */
_bufferWriter->writeLEB128(_constantPoolTypes.getMethodCount());
MethodEntry *entry = _constantPoolTypes.getMethodEntry();
while (NULL != entry) {
/* write index */
_bufferWriter->writeLEB128(entry->index);
/* type index */
_bufferWriter->writeLEB128(entry->classIndex);
/* name index */
_bufferWriter->writeLEB128(entry->nameStringUTF8Index);
/* descriptor index */
_bufferWriter->writeLEB128(entry->descriptorStringUTF8Index);
/* modifiers */
_bufferWriter->writeLEB128(entry->modifiers);
/* hidden */
_bufferWriter->writeBoolean(entry->hidden);
entry = entry->next;
}
/* write size */
writeEventSize(dataStart);
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeClassloaderCheckpointEvent()
{
U_8 *dataStart = NULL;
if (_constantPoolTypes.getClassloaderCount() > 0) {
dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(ClassLoaderID);
/* number of states */
_bufferWriter->writeLEB128(_constantPoolTypes.getClassloaderCount());
ClassloaderEntry *entry = _constantPoolTypes.getClassloaderEntry();
while (NULL != entry) {
/* write index */
_bufferWriter->writeLEB128(entry->index);
/* class index */
_bufferWriter->writeLEB128(entry->classIndex);
/* class name index */
_bufferWriter->writeLEB128(entry->nameIndex);
entry = entry->next;
}
/* write size */
writeEventSize(dataStart);
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter:: writeClassCheckpointEvent()
{
U_8 *dataStart = NULL;
if (_constantPoolTypes.getClassCount() > 0) {
dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(ClassID);
/* number of states */
_bufferWriter->writeLEB128(_constantPoolTypes.getClassCount());
ClassEntry *entry = _constantPoolTypes.getClassEntry();
while (NULL != entry) {
/* write index */
_bufferWriter->writeLEB128(entry->index);
/* classloader index */
_bufferWriter->writeLEB128(entry->classLoaderIndex);
/* class name index */
_bufferWriter->writeLEB128(entry->nameStringUTF8Index);
/* package index */
_bufferWriter->writeLEB128(entry->packageIndex);
/* class modifiers */
_bufferWriter->writeLEB128(entry->modifiers);
/* class hidden */
_bufferWriter->writeBoolean(entry->hidden);
entry = entry->next;
}
/* write size */
writeEventSize(dataStart);
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeModuleCheckpointEvent()
{
U_8 *dataStart = NULL;
if (_constantPoolTypes.getModuleCount() > 0) {
dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(ModuleID);
/* number of states */
_bufferWriter->writeLEB128(_constantPoolTypes.getModuleCount());
ModuleEntry *entry = _constantPoolTypes.getModuleEntry();
while (NULL != entry) {
/* write index */
_bufferWriter->writeLEB128(entry->index);
/* module name index */
_bufferWriter->writeLEB128(entry->nameStringIndex);
/* module version index */
_bufferWriter->writeLEB128(entry->versionStringIndex);
/* module location index */
_bufferWriter->writeLEB128(entry->locationStringUTF8Index);
/* module location index */
_bufferWriter->writeLEB128(entry->classLoaderIndex);
entry = entry->next;
}
/* write size */
writeEventSize(dataStart);
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeThreadCheckpointEvent()
{
U_8 *dataStart = NULL;
if (_constantPoolTypes.getThreadCount() > 0) {
dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(ThreadID);
/* number of states */
_bufferWriter->writeLEB128(_constantPoolTypes.getThreadCount());
ThreadEntry *entry = _constantPoolTypes.getThreadEntry();
while (NULL != entry) {
/* write index */
_bufferWriter->writeLEB128(entry->index);
/* write OS thread name */
writeUTF8String(entry->osThreadName);
/* write OS Thread ID */
_bufferWriter->writeLEB128(entry->osTID);
/* write Java thread name */
writeUTF8String(entry->javaThreadName);
/* write Java Thread ID */
_bufferWriter->writeLEB128(entry->javaTID);
/* write Thread group index */
_bufferWriter->writeLEB128(entry->threadGroupIndex);
entry = entry->next;
}
/* write size */
writeEventSize(dataStart);
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeThreadGroupCheckpointEvent()
{
U_8 *dataStart = NULL;
if (_constantPoolTypes.getThreadGroupCount() > 0) {
dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(ThreadGroupID);
/* number of states */
_bufferWriter->writeLEB128(_constantPoolTypes.getThreadGroupCount());
ThreadGroupEntry *entry = _constantPoolTypes.getThreadGroupEntry();
while (NULL != entry) {
/* write index */
_bufferWriter->writeLEB128(entry->index);
/* write parent index */
_bufferWriter->writeLEB128(entry->parentIndex);
/* thread group name */
writeUTF8String(entry->name);
entry = entry->next;
}
/* write size */
writeEventSize(dataStart);
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeFrameTypeCheckpointEvent()
{
U_8 *dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(FrameTypeID);
/* number of states */
_bufferWriter->writeLEB128(FrameTypeCount);
const char* frameTypeNames[] = {
"INTERPRETED",
"JIT",
"JIT_INLINED",
"NATIVE"
};
for (int i = 0; i < FrameTypeCount; i++) {
/* constant index */
_bufferWriter->writeLEB128(i);
/* string encoding */
_bufferWriter->writeLEB128(UTF8);
/* string length */
UDATA len = strlen(frameTypeNames[i]);
_bufferWriter->writeLEB128(len);
/* write string */
/* TODO need to think about UTF8 enconding */
_bufferWriter->writeData((U_8 *)frameTypeNames[i], len);
}
/* write size */
writeEventSize(dataStart);
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeSymbolTableCheckpointEvent()
{
U_8 *dataStart = NULL;
if (_constantPoolTypes.getPackageCount() > 0) {
dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(SymbolID);
/* number of states */
UDATA stringCount = _constantPoolTypes.getStringUTF8Count();
UDATA packageCount = _constantPoolTypes.getPackageCount();
_bufferWriter->writeLEB128(stringCount + packageCount);
for (UDATA i = 0; i < stringCount; i++) {
StringUTF8Entry *stringEntry = (StringUTF8Entry*)_constantPoolTypes.getSymbolTableEntry(i);
/* write index */
_bufferWriter->writeLEB128(i);
/* write string */
writeUTF8String(stringEntry->string);
}
for (UDATA i = stringCount; i < (stringCount + packageCount); i++) {
PackageEntry *packageEntry = (PackageEntry*)_constantPoolTypes.getSymbolTableEntry(i);
/* write index */
_bufferWriter->writeLEB128(i);
/* write string */
writeUTF8String(packageEntry->packageName, packageEntry->packageNameLength);
}
/* write size */
writeEventSize(dataStart);
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeStacktraceCheckpointEvent()
{
U_8 *dataStart = NULL;
if (_constantPoolTypes.getStackTraceCount() > 0) {
dataStart = writeCheckpointEventHeader(Generic, 1);
/* class ID */
_bufferWriter->writeLEB128(StackTraceID);
/* number of states */
_bufferWriter->writeLEB128(_constantPoolTypes.getStackTraceCount());
StackTraceEntry *entry = _constantPoolTypes.getStackTraceEntry();
while (NULL != entry) {
/* write index */
_bufferWriter->writeLEB128(entry->index);
/* is truncated */
_bufferWriter->writeBoolean(entry->truncated);
/* number of stack frames */
UDATA framesCount = entry->numOfFrames;
_bufferWriter->writeLEB128(framesCount);
for (UDATA i = 0; i < framesCount; i++) {
StackFrame *frame = entry->frames + i;
/* method index */
_bufferWriter->writeLEB128(frame->methodIndex);
/* line number */
_bufferWriter->writeLEB128(frame->lineNumber);
/* bytecode index */
_bufferWriter->writeLEB128(frame->bytecodeIndex);
/* frame type index */
_bufferWriter->writeLEB128(frame->frameType);
}
entry = entry->next;
}
/* write size */
writeEventSize(dataStart);
}
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeJVMInformationEvent()
{
JVMInformationEntry *jvmInfo= &(VM_JFRConstantPoolTypes::getJFRConstantEvents(_vm)->JVMInfoEntry);
/* reserve size field */
U_8 *dataStart = reserveEventSize();
/* write event type */
_bufferWriter->writeLEB128(JVMInformationID);
/* write start time */
_bufferWriter->writeLEB128(j9time_nano_time());
/* write JVM name */
writeStringLiteral(jvmInfo->jvmName);
/* write JVM version */
writeStringLiteral(jvmInfo->jvmVersion);
/* write JVM arguments */
writeStringLiteral(jvmInfo->jvmArguments);
/* write JVM flags */
writeStringLiteral(jvmInfo->jvmFlags);
/* write Java arguments */
writeStringLiteral(jvmInfo->javaArguments);
/* write JVM start time */
_bufferWriter->writeLEB128(jvmInfo->jvmStartTime);
/* write pid */
_bufferWriter->writeLEB128(jvmInfo->pid);
/* write size */
writeEventSize(dataStart);
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writePhysicalMemoryEvent()
{
/* reserve size field */
U_8 *dataStart = reserveEventSize();
_bufferWriter->writeLEB128(PhysicalMemoryID);
/* write start time */
_bufferWriter->writeLEB128(j9time_nano_time());
J9MemoryInfo memInfo = {0};
I_32 rc = j9sysinfo_get_memory_info(&memInfo);
if (0 == rc) {
/* write total size */
_bufferWriter->writeLEB128(memInfo.totalPhysical);
/* write used size */
_bufferWriter->writeLEB128(memInfo.totalPhysical - memInfo.availPhysical);
} else {
_buildResult = InternalVMError;
}
/* write size */
writeEventSize(dataStart);
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeCPUInformationEvent()
{
CPUInformationEntry *cpuInfo= &(VM_JFRConstantPoolTypes::getJFRConstantEvents(_vm)->CPUInfoEntry);
/* reserve size field */
U_8 *dataStart = reserveEventSize();
/* write event type */
_bufferWriter->writeLEB128(CPUInformationID);
/* write start time */
_bufferWriter->writeLEB128(j9time_nano_time());
/* write CPU type */
writeStringLiteral(cpuInfo->cpu);
/* write CPU description */
writeStringLiteral(cpuInfo->description);
/* write CPU sockets */
_bufferWriter->writeLEB128(cpuInfo->sockets);
/* write CPU cores */
_bufferWriter->writeLEB128(cpuInfo->cores);
/* write CPU hardware threads */
_bufferWriter->writeLEB128(cpuInfo->hwThreads);
/* write size */
writeEventSize(dataStart);
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeVirtualizationInformationEvent()
{
VirtualizationInformationEntry *virtualizationInfo= &(VM_JFRConstantPoolTypes::getJFRConstantEvents(_vm)->VirtualizationInfoEntry);
/* reserve size field */
U_8 *dataStart = reserveEventSize();
/* write event type */
_bufferWriter->writeLEB128(VirtualizationInformationID);
/* write start time */
_bufferWriter->writeLEB128(j9time_nano_time());
/* write virtualization name */
writeStringLiteral(virtualizationInfo->name);
/* write size */
writeEventSize(dataStart);
return dataStart;
}
U_8 *
VM_JFRChunkWriter::writeOSInformationEvent()
{
OSInformationEntry *osInfo = &(VM_JFRConstantPoolTypes::getJFRConstantEvents(_vm)->OSInfoEntry);
/* reserve size field */
U_8 *dataStart = reserveEventSize();
/* write event type */
_bufferWriter->writeLEB128(OSInformationID);
/* write start time */
_bufferWriter->writeLEB128(j9time_nano_time());
/* write OS version */
writeStringLiteral(osInfo->osVersion);
/* write size */
writeEventSize(dataStart);
return dataStart;
}
void
VM_JFRChunkWriter::writeInitialSystemPropertyEvents(J9JavaVM *vm)
{
pool_state walkState;
J9VMSystemProperty *property = (J9VMSystemProperty *)pool_startDo(vm->systemProperties, &walkState);
while (property != NULL) {
/* reserve size field */
U_8 *dataStart = reserveEventSize();
/* write event type */
_bufferWriter->writeLEB128(InitialSystemPropertyID);
/* write start time */
_bufferWriter->writeLEB128(j9time_nano_time());
/* write key */
writeStringLiteral(property->name);
/* write value */
writeStringLiteral(property->value);
/* write size */
writeEventSize(dataStart);
property = (J9VMSystemProperty *)pool_nextDo(&walkState);
}
}
void
VM_JFRChunkWriter::writeInitialEnvironmentVariableEvents()
{
J9SysinfoEnvIteratorState envState;
memset(&envState, 0, sizeof(envState));
/* Call init with zero length buffer to get the required buffer size */
int32_t result = j9sysinfo_env_iterator_init(&envState, NULL, 0);
if (result >= 0) {
int32_t bufferSize = result;
void *buffer = j9mem_allocate_memory(bufferSize, OMRMEM_CATEGORY_VM);
if (NULL != buffer) {
J9SysinfoEnvElement envElement = {NULL};
result = j9sysinfo_env_iterator_init(&envState, buffer, bufferSize);
if (result >= 0) {
while (j9sysinfo_env_iterator_hasNext(&envState)) {
result = j9sysinfo_env_iterator_next(&envState, &envElement);
if (0 == result) {
/* reserve size field */
U_8 *dataStart = reserveEventSize();
const char *equalChar = strchr(envElement.nameAndValue, '=');
/* write event type */
_bufferWriter->writeLEB128(InitialEnvironmentVariableID);
/* write start time */
_bufferWriter->writeLEB128(j9time_nano_time());
/* write key */
writeUTF8String((U_8 *)envElement.nameAndValue, equalChar - envElement.nameAndValue);
/* write value */
writeStringLiteral(equalChar + 1);
/* write size */
writeEventSize(dataStart);
}
}
}
j9mem_free_memory(buffer);
}
}
}
void
VM_JFRChunkWriter::writeClassLoadingStatisticsEvent(void *anElement, void *userData)
{
ClassLoadingStatisticsEntry *entry = (ClassLoadingStatisticsEntry *)anElement;
VM_BufferWriter *_bufferWriter = (VM_BufferWriter *)userData;
/* reserve size field */
U_8 *dataStart = reserveEventSize(_bufferWriter );
/* write event type */
_bufferWriter->writeLEB128(ClassLoadingStatisticsID);
/* write start time */
_bufferWriter->writeLEB128(entry->ticks);
/* write user loaded class count */
_bufferWriter->writeLEB128(entry->loadedClassCount);
/* write system unloaded class count */
_bufferWriter->writeLEB128(entry->unloadedClassCount);
/* write size */
writeEventSize(_bufferWriter, dataStart);
}
void
VM_JFRChunkWriter::writeThreadContextSwitchRateEvent(void *anElement, void *userData)
{
ThreadContextSwitchRateEntry *entry = (ThreadContextSwitchRateEntry *)anElement;
VM_BufferWriter *_bufferWriter = (VM_BufferWriter *)userData;
/* reserve size field */
U_8 *dataStart = reserveEventSize(_bufferWriter);
/* write event type */
_bufferWriter->writeLEB128(ThreadContextSwitchRateID);
/* write start time */
_bufferWriter->writeLEB128(entry->ticks);
/* write switch rate */
_bufferWriter->writeFloat(entry->switchRate);
/* write size */
writeEventSize(_bufferWriter, dataStart);
}
void
VM_JFRChunkWriter::writeThreadStatisticsEvent(void *anElement, void *userData)
{
ThreadStatisticsEntry *entry = (ThreadStatisticsEntry *)anElement;
VM_BufferWriter *_bufferWriter = (VM_BufferWriter *)userData;
/* reserve event size */
U_8 *dataStart = reserveEventSize(_bufferWriter);
/* write event type */
_bufferWriter->writeLEB128(ThreadStatisticsID);
/* write start ticks */
_bufferWriter->writeLEB128(entry->ticks);
/* write active thread count */
_bufferWriter->writeLEB128(entry->activeThreadCount);
/* write daemon thread count */
_bufferWriter->writeLEB128(entry->daemonThreadCount);
/* write accumulated thread count */
_bufferWriter->writeLEB128(entry->accumulatedThreadCount);
/* write peak thread count */
_bufferWriter->writeLEB128(entry->peakThreadCount);
/* write size */
writeEventSize(_bufferWriter, dataStart);
}
static void
writeObject(J9JavaVM *vm, j9object_t obj, VM_BufferWriter *bufferWriter)
{
J9ROMClass *romClass = NULL;
if (J9VM_IS_INITIALIZED_HEAPCLASS_VM(vm, obj)) {
romClass = J9VM_J9CLASS_FROM_HEAPCLASS_VM(vm, obj)->romClass;
} else {
romClass = J9OBJECT_CLAZZ_VM(vm, obj)->romClass;
}
J9UTF8 *className = J9ROMCLASS_CLASSNAME(romClass);
bufferWriter->writeFormattedString("%.*s@%p", J9UTF8_LENGTH(className), J9UTF8_DATA(className), obj);
}
static UDATA
stackWalkCallback(J9VMThread *vmThread, J9StackWalkState *state)
{
J9JavaVM *vm = vmThread->javaVM;
J9ObjectMonitorInfo *monitorInfo = (J9ObjectMonitorInfo *)state->userData2;
IDATA *monitorCount = (IDATA *)(&state->userData3);
J9Method *method = state->method;
J9Class *methodClass = J9_CLASS_FROM_METHOD(method);
J9UTF8 *className = J9ROMCLASS_CLASSNAME(methodClass->romClass);
J9ROMMethod *romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(method);
J9UTF8 *methodName = J9ROMMETHOD_NAME(romMethod);
VM_BufferWriter *bufferWriter = (VM_BufferWriter *)state->userData1;
bufferWriter->writeFormattedString(
"at %.*s.%.*s",
J9UTF8_LENGTH(className), J9UTF8_DATA(className),
J9UTF8_LENGTH(methodName), J9UTF8_DATA(methodName));