191 lines
8.0 KiB
Java
191 lines
8.0 KiB
Java
/*
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* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.Serializable;
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import java.lang.invoke.CallSite;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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import java.lang.runtime.SwitchBootstraps;
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import org.testng.annotations.Test;
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import static org.testng.Assert.assertEquals;
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import static org.testng.Assert.fail;
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/**
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* @test
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* @compile --enable-preview -source ${jdk.version} SwitchBootstrapsTest.java
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* @run testng/othervm --enable-preview SwitchBootstrapsTest
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*/
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@Test
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public class SwitchBootstrapsTest {
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public static final MethodHandle BSM_TYPE_SWITCH;
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public static final MethodHandle BSM_ENUM_SWITCH;
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static {
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try {
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BSM_TYPE_SWITCH = MethodHandles.lookup().findStatic(SwitchBootstraps.class, "typeSwitch",
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MethodType.methodType(CallSite.class, MethodHandles.Lookup.class, String.class, MethodType.class, Object[].class));
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BSM_ENUM_SWITCH = MethodHandles.lookup().findStatic(SwitchBootstraps.class, "enumSwitch",
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MethodType.methodType(CallSite.class, MethodHandles.Lookup.class, String.class, MethodType.class, Object[].class));
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}
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catch (ReflectiveOperationException e) {
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throw new AssertionError("Should not happen", e);
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}
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}
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private void testType(Object target, int start, int result, Object... labels) throws Throwable {
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MethodType switchType = MethodType.methodType(int.class, Object.class, int.class);
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MethodHandle indy = ((CallSite) BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", switchType, labels)).dynamicInvoker();
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assertEquals((int) indy.invoke(target, start), result);
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assertEquals(-1, (int) indy.invoke(null, start));
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}
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private void testEnum(Enum<?> target, int start, int result, Object... labels) throws Throwable {
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MethodType switchType = MethodType.methodType(int.class, target.getClass(), int.class);
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MethodHandle indy = ((CallSite) BSM_ENUM_SWITCH.invoke(MethodHandles.lookup(), "", switchType, labels)).dynamicInvoker();
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assertEquals((int) indy.invoke(target, start), result);
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assertEquals(-1, (int) indy.invoke(null, start));
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}
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public enum E1 {
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A,
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B;
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}
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public enum E2 {
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C;
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}
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public void testTypes() throws Throwable {
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testType("", 0, 0, String.class, Object.class);
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testType("", 0, 0, Object.class);
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testType("", 0, 1, Integer.class);
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testType("", 0, 1, Integer.class, Serializable.class);
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testType(E1.A, 0, 0, E1.class, Object.class);
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testType(E2.C, 0, 1, E1.class, Object.class);
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testType(new Serializable() { }, 0, 1, Comparable.class, Serializable.class);
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testType("", 0, 0, "", String.class);
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testType("", 1, 1, "", String.class);
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testType("a", 0, 1, "", String.class);
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testType(1, 0, 0, 1, Integer.class);
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testType(2, 0, 1, 1, Integer.class);
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testType(Byte.valueOf((byte) 1), 0, 0, 1, Integer.class);
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testType(Short.valueOf((short) 1), 0, 0, 1, Integer.class);
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testType(Character.valueOf((char) 1), 0, 0, 1, Integer.class);
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testType(Integer.valueOf((int) 1), 0, 0, 1, Integer.class);
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try {
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testType(1, 0, 1, 1.0, Integer.class);
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fail("Didn't get the expected exception.");
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} catch (IllegalArgumentException ex) {
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//OK
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}
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testType("", 0, 0, String.class, String.class, String.class);
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testType("", 1, 1, String.class, String.class, String.class);
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testType("", 2, 2, String.class, String.class, String.class);
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}
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public void testEnums() throws Throwable {
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testEnum(E1.A, 0, 2, "B", "C", "A", E1.class);
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testEnum(E1.B, 0, 0, "B", "C", "A", E1.class);
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testEnum(E1.B, 1, 3, "B", "C", "A", E1.class);
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try {
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testEnum(E1.B, 1, 3, "B", "C", "A", E2.class);
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fail("Didn't get the expected exception.");
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} catch (IllegalArgumentException ex) {
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//OK
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}
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try {
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testEnum(E1.B, 1, 3, "B", "C", "A", String.class);
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fail("Didn't get the expected exception.");
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} catch (IllegalArgumentException ex) {
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//OK
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}
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}
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public void testWrongSwitchTypes() throws Throwable {
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MethodType[] switchTypes = new MethodType[] {
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MethodType.methodType(int.class, Object.class),
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MethodType.methodType(int.class, double.class, int.class),
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MethodType.methodType(int.class, Object.class, Integer.class)
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};
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for (MethodType switchType : switchTypes) {
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try {
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BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", switchType);
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fail("Didn't get the expected exception.");
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} catch (IllegalArgumentException ex) {
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//OK, expected
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}
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}
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MethodType[] enumSwitchTypes = new MethodType[] {
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MethodType.methodType(int.class, Enum.class),
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MethodType.methodType(int.class, Object.class, int.class),
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MethodType.methodType(int.class, double.class, int.class),
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MethodType.methodType(int.class, Enum.class, Integer.class)
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};
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for (MethodType enumSwitchType : enumSwitchTypes) {
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try {
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BSM_ENUM_SWITCH.invoke(MethodHandles.lookup(), "", enumSwitchType);
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fail("Didn't get the expected exception.");
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} catch (IllegalArgumentException ex) {
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//OK, expected
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}
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}
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}
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public void testNullLabels() throws Throwable {
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MethodType switchType = MethodType.methodType(int.class, Object.class, int.class);
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try {
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BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", switchType, (Object[]) null);
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fail("Didn't get the expected exception.");
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} catch (NullPointerException ex) {
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//OK
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}
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try {
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BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", switchType,
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new Object[] {1, null, String.class});
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fail("Didn't get the expected exception.");
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} catch (IllegalArgumentException ex) {
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//OK
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}
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MethodType enumSwitchType = MethodType.methodType(int.class, E1.class, int.class);
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try {
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BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", enumSwitchType, (Object[]) null);
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fail("Didn't get the expected exception.");
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} catch (NullPointerException ex) {
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//OK
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}
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try {
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BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", enumSwitchType,
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new Object[] {1, null, String.class});
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fail("Didn't get the expected exception.");
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} catch (IllegalArgumentException ex) {
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//OK
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}
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}
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}
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