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/*
* Copyright (c) 2024, 2025, 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
* @bug 8350704
* @summary Test behaviors with various bad EnclosingMethod attribute
* @library /test/lib
* @run junit BadEnclosingMethodTest
*/
import jdk.test.lib.ByteCodeLoader;
import org.junit.jupiter.api.Test;
import java.lang.classfile.ClassFile;
import java.lang.classfile.attribute.EnclosingMethodAttribute;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Map;
import java.util.Optional;
import static java.lang.constant.ConstantDescs.INIT_NAME;
import static org.junit.jupiter.api.Assertions.*;
class BadEnclosingMethodTest {
private static Path classPath(String className) {
return Path.of(System.getProperty("test.classes"), className + ".class");
}
/**
* Loads a test class that is transformed from the Enclosed local class in
* the Encloser::work method. This local class has its EnclosingMethod
* attribute transformed to the specific name and type, which may be malformed
* strings.
*
* @param name the new enclosing method name, may be malformed
* @param type the new enclosing method type, may be malformed
* @return the loaded test class, for reflective inspection
*/
private Class<?> loadTestClass(String name, String type) throws Exception {
var outerName = "Encloser";
var className = outerName + "$1Enclosed";
var cf = ClassFile.of();
var cm = cf.parse(classPath(className));
var bytes = cf.transformClass(cm, (cb, ce) -> {
if (ce instanceof EnclosingMethodAttribute em) {
var cp = cb.constantPool();
var enclosingMethodName = cp.utf8Entry(name);
var enclosingMethodType = cp.utf8Entry(type); // a malformed method type
cb.with(EnclosingMethodAttribute.of(em.enclosingClass(), Optional.of(cp.nameAndTypeEntry(
enclosingMethodName, enclosingMethodType
))));
} else {
cb.with(ce);
}
});
var map = Map.of(
outerName, Files.readAllBytes(classPath(outerName)),
className, bytes
);
return new ByteCodeLoader(map, BadEnclosingMethodTest.class.getClassLoader())
.loadClass(className);
}
/**
* Test reflection behaviors when the EnclosingMethod attribute's type is
* an invalid string.
*/
@Test
void testMalformedTypes() throws Exception {
assertThrows(ClassFormatError.class, () -> loadTestClass("methodName", "(L[;)V"));
assertThrows(ClassFormatError.class, () -> loadTestClass(INIT_NAME, "(L[;)V"));
}
/**
* Test reflective behaviors when the EnclosingMethod attribute's type is
* valid, but refers to a class or interface that cannot be found.
*/
@Test
void testAbsentMethods() throws Exception {
var absentMethodType = loadTestClass("methodName", "(Ldoes/not/Exist;)V");
var ex = assertThrows(TypeNotPresentException.class,
absentMethodType::getEnclosingMethod);
assertEquals("does.not.Exist", ex.typeName());
var absentConstructorType = loadTestClass(INIT_NAME, "(Ldoes/not/Exist;)V");
ex = assertThrows(TypeNotPresentException.class,
absentConstructorType::getEnclosingConstructor);
assertEquals("does.not.Exist", ex.typeName());
}
}
class Encloser {
private static void work() {
class Enclosed {
}
}
}
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