test/jdk/java/lang/Class/getEnclosingMethod/BadEnclosingMethodTest.java - master - githubmirror/galahad

test/jdk/java/lang/Class/getEnclosingMethod/BadEnclosingMethodTest.java
132 строки5 KB
Chen Liang
8370976: Review the behavioral changes of core reflection descriptor parsing migration
21 ноя 2025, 03:38
21 ноя 2025, 03:38d887359
/*
 * 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.lang.reflect.GenericSignatureFormatError;
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 {
        assertThrowsExactly(ClassFormatError.class, () -> loadTestClass("methodName", "(L[;)V"));
        assertThrowsExactly(ClassFormatError.class, () -> loadTestClass(INIT_NAME, "(L[;)V"));
        assertThrowsExactly(ClassFormatError.class, () -> loadTestClass(INIT_NAME, "(Lmissing/;)V"));
        assertThrowsExactly(ClassFormatError.class, () -> loadTestClass(INIT_NAME, "()L/Missing;"));
        // only throw if the query type match the method/constructor type
        assertDoesNotThrow(() -> loadTestClass(INIT_NAME, "Ljava/lang/Object;").getEnclosingMethod());
        assertDoesNotThrow(() -> loadTestClass("method", "[I").getEnclosingConstructor());
        // We have to manually intercept field-typed "methods"
        assertThrows(GenericSignatureFormatError.class, () -> loadTestClass(INIT_NAME, "Ljava/lang/Object;").getEnclosingConstructor());
        assertThrows(GenericSignatureFormatError.class, () -> loadTestClass("method", "[I").getEnclosingMethod());
    }

    /**
     * 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 {
        }
    }
}