/* * 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. * * 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.
*/ package jdk.jfr.api.consumer;
publicstaticvoid 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
}
staticvoid 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.
}
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
*/ privatestaticint getLineNumber(String methodName) { for (StackTraceElement ste : Thread.currentThread().getStackTrace()) { if (methodName.equals(ste.getMethodName())) { return ste.getLineNumber();
}
} thrownew RuntimeException("Unexpected error: could not analyze stacktrace");
}
}
Messung V0.5
¤ Dauer der Verarbeitung: 0.10 Sekunden
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