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/*
* Copyright (c) 2016, 2022, 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.
*
*/
import jdk.test.whitebox.WhiteBox;
class LoadMe {
static String getValue() {
return "beforeHook";
}
static String getOtherValue() {
return "abc-beforeHook-xyz";
}
}
public class ClassFileLoadHook {
public enum TestCaseId {
SHARING_OFF_CFLH_ON, // test case to establish a baseline
SHARING_ON_CFLH_OFF,
SHARING_AUTO_CFLH_ON,
SHARING_ON_CFLH_ON
}
public static void main(String args[]) throws Exception {
TestCaseId testCase = TestCaseId.valueOf(args[0]);
test1(testCase);
test2(testCase);
}
// Test rewriting the classfile data using CFLH
static void test1(TestCaseId testCase) {
WhiteBox wb = WhiteBox.getWhiteBox();
System.out.println("====== ClassFileLoadHook.main():testCase = " + testCase);
System.out.println("getValue():" + LoadMe.getValue());
System.out.println("getOtherValue():" + LoadMe.getOtherValue());
switch (testCase) {
case SHARING_OFF_CFLH_ON:
assertTrue("after_Hook".equals(LoadMe.getValue()) &&
"abc-after_Hook-xyz".equals(LoadMe.getOtherValue()),
"Not sharing, this test should replace beforeHook " +
"with after_Hook");
break;
case SHARING_ON_CFLH_OFF:
assertTrue(wb.isSharedClass(LoadMe.class),
"LoadMe should be shared, but is not");
assertTrue("beforeHook".equals(LoadMe.getValue()) &&
"abc-beforeHook-xyz".equals(LoadMe.getOtherValue()),
"CFLH off, bug values are redefined");
break;
case SHARING_AUTO_CFLH_ON:
case SHARING_ON_CFLH_ON:
// LoadMe is rewritten on CFLH
assertFalse(wb.isSharedClass(LoadMe.class),
"LoadMe should not be shared if CFLH has modified the class");
assertFalse("beforeHook".equals(LoadMe.getValue()) &&
"abc-beforeHook-xyz".equals(LoadMe.getOtherValue()),
"Class contents should be changed if CFLH is enabled");
break;
default:
throw new RuntimeException("Invalid testcase");
}
}
// Test the loading of classfile data for non-boot shared classes from jrt:/xxx.
// See JDK-8221351.
static void test2(TestCaseId testCase) throws Exception {
WhiteBox wb = WhiteBox.getWhiteBox();
Class c = Class.forName("java.sql.SQLException"); // defined by platform class loader.
switch (testCase) {
case SHARING_ON_CFLH_OFF:
case SHARING_ON_CFLH_ON:
assertTrue(wb.isSharedClass(c), "must be shared");
break;
case SHARING_AUTO_CFLH_ON:
// With -Xshare:auto, the test continues to run with mapping failure.
// In case of mapping failure, java/lang/Object and the app class
// won't be loaded from the archive.
Class objClass = Class.forName("java.lang.Object");
if (wb.isSharedClass(objClass)) {
assertTrue(wb.isSharedClass(c), "must be shared");
} else {
assertFalse(wb.isSharedClass(c), "must not be shared");
}
break;
default:
// this test is not applicable to -Xshare:off
if (testCase != TestCaseId.SHARING_OFF_CFLH_ON) {
throw new RuntimeException("Invalid testcase");
}
}
}
private static void assertTrue(boolean expr, String msg) {
if (!expr)
throw new RuntimeException(msg);
}
private static void assertFalse(boolean expr, String msg) {
if (expr)
throw new RuntimeException(msg);
}
}
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