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/*
* Copyright (c) 2007, 2018, 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 vm.share.stack;
import java.util.List;
import java.util.Map;
import nsk.share.TestFailure;
import nsk.share.log.Log;
public final class StackUtils {
private StackUtils() {
}
private static String replace(String s) {
return (s == null || s.length() == 0) ? "?" : s;
}
/**
* String representation of stack trace element.
*
* Note that null and empty values are replaced with '?'.
*/
public static String strStackTraceElement(StackTraceElement element) {
return "at " + replace(element.getClassName()) + "." + replace(element.getMethodName()) + "(" + replace(element.getFileName()) + ":" + element.getLineNumber() + ")";
}
public static void printStackTraceElement(Log log, StackTraceElement element) {
log.info(" " + strStackTraceElement(element));
}
public static void printStackTrace(Log log, StackTraceElement[] elements) {
for (StackTraceElement element : elements)
printStackTraceElement(log, element);
}
public static void printStackTrace(Log log, Iterable<StackTraceElement> elements) {
for (StackTraceElement element : elements)
printStackTraceElement(log, element);
}
/**
* Check that element matches expected element.
*
* Expected element is used as pattern for matching. A null or empty
* field value means that no comparison is done.
*/
public static boolean matches(StackTraceElement element, StackTraceElement expected) {
return
(expected.getClassName() == null || expected.getClassName().length() == 0 || expected.getClassName().equals(element.getClassName())) &&
(expected.getMethodName() == null || expected.getMethodName().length() == 0 || expected.getMethodName().equals(element.getMethodName())) &&
(expected.isNativeMethod() == element.isNativeMethod());
}
public static StackTraceElement expectedTraceElement(String className, String methodName, boolean nativeMethod) {
// Replace null className with empty because StackTraceElement constructor does not allow null className.
return new StackTraceElement(className == null ? "" : className, methodName, null, (nativeMethod ? -2 : 0));
}
public static void addExpectedTraceElement(List<StackTraceElement> expectedTrace, String className, String methodName, boolean nativeMethod) {
expectedTrace.add(0, expectedTraceElement(className, methodName, nativeMethod));
}
/**
* Check that trace elements starting from given index match expected elements.
*/
public static void checkMatches(StackTraceElement[] elements, List<StackTraceElement> expectedTrace, int i) {
if (elements.length - i < expectedTrace.size())
throw new TestFailure("Expected at least " + expectedTrace.size() + " trace elements, got only " + (i + 1));
for (int j = 0; j < expectedTrace.size(); ++j) {
StackTraceElement expected = expectedTrace.get((expectedTrace.size() - 1) - j);
int index = (elements.length - 1) - i - j;
StackTraceElement actual = elements[index];
if (!matches(actual, expected))
throw new TestFailure("Expected element at index " + index + " to match: " + strStackTraceElement(expected));
}
}
/**
* Find matching stack trace element starting from top of the stack.
*/
public static int findMatch(StackTraceElement[] elements, StackTraceElement expected) {
for (int i = 0; i < elements.length; ++i)
if (StackUtils.matches(elements[elements.length - 1 - i], expected))
return i;
return -1;
}
/**
* Find the stack trace element that contains the "main(String[])" method
*
* @return StackTraceElement containing "main" function, null if there are more than one
*/
public static StackTraceElement findMain() {
Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces();
StackTraceElement mainMethodFrame = null;
for(StackTraceElement[] current : stackTraces.values()) {
if (current.length > 0) {
StackTraceElement last = current[current.length - 1];
if ("main".equals(last.getMethodName())) {
if (mainMethodFrame == null) {
mainMethodFrame = last;
} else if (!mainMethodFrame.getClassName().equals(last.getClassName())) {
// more than one class has a "main"
return null;
}
}
}
}
return mainMethodFrame;
}
}
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