Add JFR InitialSystemProperty event support

Signed-off-by: Gengchen Tuo <gengchen.tuo@ibm.com>

Author: thallium

runtime/vm/JFRChunkWriter.cpp

@@ -786,4 +786,33 @@ VM_JFRChunkWriter::writeOSInformationEvent()
 	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 = _bufferWriter->getAndIncCursor(sizeof(U_32));
+
+		/* write event type */
+		_bufferWriter->writeLEB128(InitialSystemPropertyID);
+
+		/* write start time */
+		_bufferWriter->writeLEB128(j9time_current_time_millis());
+
+		/* write key */
+		writeStringLiteral(property->name);
+
+		/* write value */
+		writeStringLiteral(property->value);
+
+		/* write size */
+		_bufferWriter->writeLEB128PaddedU32(dataStart, _bufferWriter->getCursor() - dataStart);
+
+		property = (J9VMSystemProperty *)pool_nextDo(&walkState);
+	}
+}
+
 #endif /* defined(J9VM_OPT_JFR) */

runtime/vm/JFRChunkWriter.hpp

@@ -68,6 +68,7 @@ enum MetadataTypeID {
 	JVMInformationID = 86,
 	OSInformationID = 87,
 	VirtualizationInformationID = 88,
+	InitialSystemPropertyID = 89,
 	CPUInformationID = 92,
 	PhysicalMemoryID = 107,
 	ExecutionSampleID = 108,
@@ -153,6 +154,7 @@ class VM_JFRChunkWriter {
 	static constexpr int VIRTUALIZATION_INFORMATION_EVENT_SIZE = 50;
 	static constexpr int CPU_INFORMATION_EVENT_SIZE = 600;
 	static constexpr int OS_INFORMATION_EVENT_SIZE = 100;
+	static constexpr int INITIAL_SYSTEM_PROPERTY_EVENT_SIZE = 6000;
 
 	static constexpr int METADATA_ID = 1;
 
@@ -330,6 +332,8 @@ class VM_JFRChunkWriter {
 				writeVirtualizationInformationEvent();
 
 				writeOSInformationEvent();
+
+				writeInitialSystemPropertyEvents(_vm);
 			}
 
 			writePhysicalMemoryEvent();
@@ -531,6 +535,8 @@ class VM_JFRChunkWriter {
 
 	U_8 *writeOSInformationEvent();
 
+	void writeInitialSystemPropertyEvents(J9JavaVM *vm);
+
 	UDATA
 	calculateRequiredBufferSize()
 	{
@@ -579,6 +585,7 @@ class VM_JFRChunkWriter {
 
 		requireBufferSize += CPU_INFORMATION_EVENT_SIZE;
 
+		requireBufferSize += INITIAL_SYSTEM_PROPERTY_EVENT_SIZE;
 		return requireBufferSize;
 	}