/*
* Copyright ( c ) 2020 , 2022 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
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* under the terms of the GNU General Public License version 2 only , as
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*
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* 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 ) .
*
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* 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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/**
* @ test
* @ summary Test stack traces in exceptions and stack frames waslked by the StackWalker
* API do not include the carrier stack frames
* @ requires vm . continuations
* @ modules java . management
* @ library / test / lib
* @ enablePreview
* @ run testng StackTraces
* @ run testng / othervm - XX : + UnlockDiagnosticVMOptions - XX : + ShowCarrierFrames StackTraces
*/
import java.lang.management.ManagementFactory;
import java.util.Arrays;
import java.util.Set;
import java.util.concurrent.ForkJoinPool;
import static java.lang.StackWalker.Option.*;
import jdk.test.lib.thread .VThreadRunner;
import org.testng.annotations.Test;
import static org.testng.Assert .*;
public class StackTraces {
/**
* Test that the stack trace in exceptions does not include the carrier thread
* frames , except when running with - XX : + ShowCarrierFrames .
*/
@Test
public void testStackTrace() throws Exception {
VThreadRunner.run(() -> {
Exception e = new Exception();
boolean found = Arrays.stream(e.getStackTrace())
.map(StackTraceElement::getClassName)
.anyMatch("java.util.concurrent.ForkJoinPool" ::equals);
assertTrue(found == hasJvmArgument("-XX:+ShowCarrierFrames" ));
});
}
/**
* Test that StackWalker does not include carrier thread frames .
*/
@Test
public void testStackWalker() throws Exception {
VThreadRunner.run(() -> {
StackWalker walker = StackWalker.getInstance(Set.of(RETAIN_CLASS_REFERENCE));
boolean found = walker.walk(sf ->
sf.map(StackWalker.StackFrame::getDeclaringClass)
.anyMatch(c -> c == ForkJoinPool.class ));
assertFalse(found);
});
}
private static boolean hasJvmArgument(String arg) {
for (String argument : ManagementFactory.getRuntimeMXBean().getInputArguments()) {
if (argument.equals(arg)) return true ;
}
return false ;
}
}
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