/*
* Copyright ( c ) 2016 , 2020 , 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 .
*
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*/
package jdk.jfr.api.consumer;
import java.io.IOException;
import java.util.List;
import java.util.Set;
import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.consumer.RecordedFrame;
import jdk.jfr.consumer.RecordedMethod;
import jdk.jfr.consumer.RecordedStackTrace;
import jdk.test.lib.Asserts;
import jdk.test.lib.jfr.Events;
import jdk.test.lib.jfr.SimpleEvent;
/**
* @ test
* @ summary Simple test for RecordedFrame APIs
* @ key jfr
* @ requires vm . hasJFR
* @ library / test / lib
* @ run main / othervm jdk . jfr . api . consumer . TestRecordedFrame
*/
public final class TestRecordedFrame {
public static void main(String[] args) throws IOException {
doSomething(); // Makes BCI for method larger than 0
test(); // Records the line number and BCI for the main method/frame
}
static void doSomething() {
// Don't actually do anything: on platforms that do not support
// patching (AArch64) -Xcomp is very sensitive to class load
// order and calling other methods here might result in main()
// being deoptimized, failing the test below.
}
static void test() throws IOException {
try (Recording recording = new Recording()) {
recording.start();
SimpleEvent ev = new SimpleEvent();
ev.commit();
recording.stop();
List<RecordedEvent> recordedEvents = Events.fromRecording(recording);
Events.hasEvents(recordedEvents);
RecordedEvent recordedEvent = recordedEvents.get(0 );
RecordedStackTrace stacktrace = recordedEvent.getStackTrace();
List<RecordedFrame> frames = stacktrace.getFrames();
for (RecordedFrame frame : frames) {
// All frames are java frames
Asserts.assertTrue(frame.isJavaFrame());
// Verify the main() method frame
RecordedMethod method = frame.getMethod();
if (method.getName().equals("main" )) {
// Frame type
String type = frame.getType();
System.out.println("type: " + type);
Set<String> types = Set.of("Interpreted" , "JIT compiled" , "Inlined" );
Asserts.assertTrue(types.contains(type));
// Line number
Asserts.assertEquals(getLineNumber("main" ), frame.getLineNumber());
// BCI
int bci = frame.getBytecodeIndex();
System.out.println("bci: " + bci);
Asserts.assertGreaterThan(bci, 0 );
}
}
}
}
/**
* Returns line number of a method on the stack
*/
private static int getLineNumber(String methodName) {
for (StackTraceElement ste : Thread .currentThread().getStackTrace()) {
if (methodName.equals(ste.getMethodName())) {
return ste.getLineNumber();
}
}
throw new RuntimeException("Unexpected error: could not analyze stacktrace" );
}
}
Messung V0.5 in Prozent C=97 H=84 G=90
¤ Dauer der Verarbeitung: 0.7 Sekunden
(vorverarbeitet am 2026-06-10)
¤
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