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/*
* Copyright (c) 2020, 2023, 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.
*/
/**
* @test
* @summary Test stack traces in exceptions and stack frames walked by the StackWalker
* API do not include the carrier stack frames
* @requires vm.continuations
* @modules java.management
* @library /test/lib
* @run junit StackTraces
* @run junit/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.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
class StackTraces {
/**
* Test that the stack trace in exceptions does not include the carrier thread
* frames, except when running with -XX:+ShowCarrierFrames.
*/
@Test
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
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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