jdk-24/test/jdk/java/lang/invoke/lambda/MetafactoryMethodNameTest.java

/*
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 * 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.
 *
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 * questions.
 */

/*
 * @test
 * @bug 8173587
 * @summary metafactory should fail if the method name is not legal
 */
import java.lang.invoke.*;
import java.util.*;

public class MetafactoryMethodNameTest {

    public static void main(String... args) {
        goodName("x");
        goodName("xy");

        goodName("]");
        goodName("x]");
        goodName("]y");
        goodName("x]y");

        goodName("&");
        goodName("x&");
        goodName("&y");
        goodName("x&y");

        badName(".");
        badName("x.");
        badName(".y");
        badName("x.y");

        badName(";");
        badName("x;");
        badName(";y");
        badName("x;y");

        badName("[");
        badName("x[");
        badName("[y");
        badName("x[y");

        badName("/");
        badName("x/");
        badName("/y");
        badName("x/y");

        badName("<");
        badName("x<");
        badName("<y");
        badName("x<y");

        badName(">");
        badName("x>");
        badName(">y");
        badName("x>y");

        badName("");
        badName("<init>");
        badName("<clinit>");
    }

    static MethodType mt(Class<?> ret, Class<?>... params) {
        return MethodType.methodType(ret, params);
    }

    static MethodHandle smh(Class<?> c, String name, MethodType desc) {
        try {
            return MethodHandles.lookup().findStatic(c, name, desc);
        } catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    static Object[] arr(Object... args) {
        return args;
    }

    public static class C {
        public static void m() {}
    }

    public interface I {}

    private static MethodHandles.Lookup lookup = MethodHandles.lookup();
    private static MethodType toI = mt(I.class);
    private static MethodType toVoid = mt(void.class);
    private static MethodHandle mh = smh(C.class, "m", toVoid);
    private static Class<?> lce = LambdaConversionException.class;

    static void goodName(String name) {
        succeedMFLinkage(lookup, name, toI, toVoid, mh, toVoid);
        succeedAltMFLinkage(lookup, name, toI, arr(toVoid, mh, toVoid, LambdaMetafactory.FLAG_SERIALIZABLE));
    }

    static void badName(String name) {
        failMFLinkage(lookup, name, toI, toVoid, mh, toVoid, lce);
        failAltMFLinkage(lookup, name, toI, arr(toVoid, mh, toVoid, LambdaMetafactory.FLAG_SERIALIZABLE), lce);
    }

    static CallSite succeedMFLinkage(MethodHandles.Lookup lookup,
                                    String name,
                                    MethodType capType,
                                    MethodType desc,
                                    MethodHandle impl,
                                    MethodType checked) {
        try {
            return LambdaMetafactory.metafactory(lookup, name, capType, desc, impl, checked);
        } catch (Throwable t) {
            String msg = String.format("Unexpected exception during linkage for metafactory(%s, %s, %s, %s, %s, %s)",
                    lookup, name, capType, desc, impl, checked);
            throw new AssertionError(msg, t);
        }
    }

    static void failMFLinkage(MethodHandles.Lookup lookup,
                              String name,
                              MethodType capType,
                              MethodType desc,
                              MethodHandle impl,
                              MethodType checked,
                              Class<?> expectedExceptionType) {
        try {
            LambdaMetafactory.metafactory(lookup, name, capType, desc, impl, checked);
        } catch (Throwable t) {
            if (expectedExceptionType.isInstance(t)) {
                return;
            } else {
                String msg = String.format("Unexpected exception: expected %s during linkage for metafactory(%s, %s, %s, %s, %s, %s)",
                        expectedExceptionType.getName(),
                        lookup, name, capType, desc, impl, checked);
                throw new AssertionError(msg, t);
            }
        }
        String msg = String.format("Unexpected success: expected %s during linkage for metafactory(%s, %s, %s, %s, %s, %s)",
                expectedExceptionType.getName(),
                lookup, name, capType, desc, impl, checked);
        throw new AssertionError(msg);
    }

    static CallSite succeedAltMFLinkage(MethodHandles.Lookup lookup,
                                        String name,
                                        MethodType capType,
                                        Object[] args) {
        try {
            return LambdaMetafactory.altMetafactory(lookup, name, capType, args);
        } catch (Throwable t) {
            String msg = String.format("Unexpected exception during linkage for metafactory(%s, %s, %s, %s)",
                    lookup, name, capType, Arrays.asList(args));
            throw new AssertionError(msg, t);
        }
    }

    static void failAltMFLinkage(MethodHandles.Lookup lookup,
                                 String name,
                                 MethodType capType,
                                 Object[] args,
                                 Class<?> expectedExceptionType) {
        try {
            LambdaMetafactory.altMetafactory(lookup, name, capType, args);
        } catch (Throwable t) {
            if (expectedExceptionType.isInstance(t)) {
                return;
            } else {
                String msg = String.format("Unexpected exception: expected %s during linkage for metafactory(%s, %s, %s, %s)",
                        expectedExceptionType.getName(),
                        lookup, name, capType, Arrays.asList(args));
                throw new AssertionError(msg, t);
            }
        }
        String msg = String.format("Unexpected success: expected %s during linkage for metafactory(%s, %s, %s, %s)",
                expectedExceptionType.getName(),
                lookup, name, capType, Arrays.asList(args));
        throw new AssertionError(msg);
    }

}