russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
422 lines
17 KiB
Java
422 lines
17 KiB
Java
/*
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* Copyright (c) 2021, 2026, 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.
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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.Enum.EnumDesc;
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import java.lang.constant.ClassDesc;
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import java.lang.constant.ConstantDescs;
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import java.lang.constant.MethodTypeDesc;
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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.reflect.AccessFlag;
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import java.lang.runtime.SwitchBootstraps;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.lang.classfile.ClassFile;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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/**
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* @test
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* @bug 8318144
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* @enablePreview
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* @compile SwitchBootstrapsTest.java
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* @run junit/othervm SwitchBootstrapsTest
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*/
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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(result, (int) indy.invoke(target, start));
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assertEquals(-1, (int) indy.invoke(null, start));
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}
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private void testPrimitiveType(Object target, Class<?> targetType, int start, int result, Object... labels) throws Throwable {
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MethodType switchType = MethodType.methodType(int.class, targetType, int.class);
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MethodHandle indy = ((CallSite) BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", switchType, labels)).dynamicInvoker();
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assertEquals(result, (int) indy.invoke(target, 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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testEnum(target.getClass(), target, start, result, labels);
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}
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private void testEnum(Class<?> targetClass, Enum<?> target, int start, int result, Object... labels) throws Throwable {
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MethodType switchType = MethodType.methodType(int.class, targetClass, int.class);
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MethodHandle indy = ((CallSite) BSM_ENUM_SWITCH.invoke(MethodHandles.lookup(), "", switchType, labels)).dynamicInvoker();
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assertEquals(result, (int) indy.invoke(target, start));
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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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@Test
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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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testType(1, 0, 1, 1.0d, Integer.class);
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testType(1, 0, 1, 1.0f, Integer.class);
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testType(1, 0, 1, true, Integer.class);
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testType("", 0, 0, String.class, String.class, String.class, String.class, String.class);
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testType("", 1, 1, String.class, String.class, String.class, String.class, String.class);
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testType("", 2, 2, String.class, String.class, String.class, String.class, String.class);
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testType("", 3, 3, String.class, String.class, String.class, String.class, String.class);
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testType("", 3, 3, String.class, String.class, String.class, String.class, String.class);
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testType("", 4, 4, String.class, String.class, String.class, String.class, String.class);
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testType("", 0, 0);
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testType(new Object() {
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@Override
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public boolean equals(Object obj) {
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if (obj instanceof Long i) {
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return i == 1;
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}
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return super.equals(obj);
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}
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}, 0, 1, 1L);
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}
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@Test
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public void testPrimitiveTypes() throws Throwable {
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testPrimitiveType((short) 1, short.class, 0, 1, String.class);
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testPrimitiveType((byte) 1, byte.class,0, 1, String.class, byte.class);
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testPrimitiveType(true, boolean.class,0, 1, false, boolean.class);
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testPrimitiveType(1, int.class,0, 1, String.class);
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testPrimitiveType(1, int.class,0, 1, true);
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testPrimitiveType(true, boolean.class,0, 1, false);
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testPrimitiveType((byte) 1, byte.class,0, 1, boolean.class, byte.class);
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testPrimitiveType((byte) 1, byte.class,0, 1, Boolean.class, byte.class);
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testPrimitiveType(true, boolean.class,0, 1, String.class, boolean.class);
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}
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@Test
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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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assertThrows(IllegalArgumentException.class, () ->
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testEnum(E1.B, 0, -1, E2.class)
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);
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assertThrows(IllegalArgumentException.class, () ->
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testEnum(E1.B, 0, -1, String.class)
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);
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assertThrows(IllegalArgumentException.class, () ->
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testEnum(E1.B, 0, -1, 10)
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);
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assertThrows(IllegalArgumentException.class, () ->
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testEnum(E1.B, 0, -1, new Object())
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);
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assertThrows(IllegalArgumentException.class, () ->
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testEnum(E1.B, 0, -1, new Object[] { null })
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);
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assertThrows(IllegalArgumentException.class, () ->
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testEnum(E1.B, 0, -1, "")
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);
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assertThrows(NullPointerException.class, () ->
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testEnum(E1.B, 0, -1, (Object[]) null)
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);
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testEnum(E1.B, 0, 0, "B", "A");
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testEnum(E1.A, 0, 1, "B", "A");
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testEnum(E1.A, 0, 0, "A", "A", "B");
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testEnum(E1.A, 1, 1, "A", "A", "B");
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testEnum(E1.A, 2, 3, "A", "A", "B");
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testEnum(E1.A, 0, 0);
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testEnum(E1.B, 0, 2, "A", "OLD_REMOVED_CONSTANT", "B", E1.class);
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testEnum(E1.B, 1, 2, "A", "OLD_REMOVED_CONSTANT", "B", E1.class);
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//null invocation name:
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MethodType switchType = MethodType.methodType(int.class, E1.class, int.class);
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MethodHandle indy = ((CallSite) BSM_ENUM_SWITCH.invoke(MethodHandles.lookup(), null, switchType)).dynamicInvoker();
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assertEquals(0, (int) indy.invoke(E1.A, 0));
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}
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@Test
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public void testEnumsWithConstants() throws Throwable {
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enum E {
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A {},
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B {},
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C {}
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}
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ClassDesc eDesc = E.class.describeConstable().get();
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Object[] typeParams = new Object[] {
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EnumDesc.of(eDesc, "A"),
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EnumDesc.of(eDesc, "B"),
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EnumDesc.of(eDesc, "C"),
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"a",
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String.class
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};
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testType(E.A, 0, 0, typeParams);
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testType(E.B, 0, 1, typeParams);
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testType(E.C, 0, 2, typeParams);
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testType("a", 0, 3, typeParams);
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testType("x", 0, 4, typeParams);
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testType('a', 0, 5, typeParams);
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testEnum(E.class, E.A, 0, 0, "A", "B", "C");
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testEnum(E.class, E.B, 0, 1, "A", "B", "C");
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testEnum(E.class, E.C, 0, 2, "A", "B", "C");
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testEnum(E.class, E.C, 0, 2, "A", "B");
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testEnum(E.class, E.C, 1, 2, "A", "B");
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testEnum(E.class, E.C, 2, 2, "A", "B");
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}
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@Test
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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, Object.class, Integer.class)
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};
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for (MethodType switchType : switchTypes) {
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assertThrows(IllegalArgumentException.class, () ->
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BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", switchType)
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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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assertThrows(IllegalArgumentException.class, () ->
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BSM_ENUM_SWITCH.invoke(MethodHandles.lookup(), "", enumSwitchType)
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);
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}
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}
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@Test
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public void testSwitchLabelTypes() throws Throwable {
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enum E {A}
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assertThrows(IllegalArgumentException.class, () ->
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testType(E.A, 0, -1, E.A)
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);
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}
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@Test
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public void testSwitchQualifiedEnum() throws Throwable {
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enum E {A, B, C}
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Object[] labels = new Object[] {
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EnumDesc.of(ClassDesc.of(E.class.getName()), "A"),
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EnumDesc.of(ClassDesc.of(E.class.getName()), "B"),
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EnumDesc.of(ClassDesc.of(E.class.getName()), "C")
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};
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testType(E.A, 0, 0, labels);
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testType(E.B, 0, 1, labels);
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testType(E.C, 0, 2, labels);
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}
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@Test
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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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assertThrows(NullPointerException.class, () ->
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BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", switchType, (Object[]) null)
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);
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assertThrows(IllegalArgumentException.class, () ->
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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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);
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MethodType enumSwitchType = MethodType.methodType(int.class, E1.class, int.class);
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assertThrows(NullPointerException.class, () ->
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BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", enumSwitchType, (Object[]) null)
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);
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assertThrows(IllegalArgumentException.class, () ->
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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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);
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//null invocationName is OK:
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BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), null, switchType,
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new Object[] {Object.class});
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}
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private static AtomicBoolean enumInitialized = new AtomicBoolean();
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@Test
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public void testEnumInitialization1() throws Throwable {
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enumInitialized.set(false);
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enum E {
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A;
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static {
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enumInitialized.set(true);
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}
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}
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MethodType enumSwitchType = MethodType.methodType(int.class, E.class, int.class);
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CallSite invocation = (CallSite) BSM_ENUM_SWITCH.invoke(MethodHandles.lookup(), "", enumSwitchType, new Object[] {"A"});
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assertFalse(enumInitialized.get());
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assertEquals(-1, invocation.dynamicInvoker().invoke(null, 0));
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assertFalse(enumInitialized.get());
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E e = E.A;
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assertTrue(enumInitialized.get());
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assertEquals(0, invocation.dynamicInvoker().invoke(e, 0));
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}
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@Test
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public void testEnumInitialization2() throws Throwable {
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enumInitialized.set(false);
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enum E {
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A;
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static {
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enumInitialized.set(true);
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}
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}
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MethodType switchType = MethodType.methodType(int.class, Object.class, int.class);
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Object[] labels = new Object[] {
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EnumDesc.of(ClassDesc.of(E.class.getName()), "A"),
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"test"
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};
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CallSite invocation = (CallSite) BSM_TYPE_SWITCH.invoke(MethodHandles.lookup(), "", switchType, labels);
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assertFalse(enumInitialized.get());
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assertEquals(-1, invocation.dynamicInvoker().invoke(null, 0));
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assertFalse(enumInitialized.get());
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assertEquals(1, invocation.dynamicInvoker().invoke("test", 0));
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assertFalse(enumInitialized.get());
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E e = E.A;
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assertTrue(enumInitialized.get());
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assertEquals(0, invocation.dynamicInvoker().invoke(e, 0));
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}
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@Test
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public void testIncorrectEnumLabels() throws Throwable {
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assertThrows(IllegalArgumentException.class, () ->
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testEnum(E1.B, 0, -1, "B", 1)
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);
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assertThrows(IllegalArgumentException.class, () ->
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testEnum(E1.B, 0, -1, "B", null)
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);
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}
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@Test
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public void testIncorrectEnumStartIndex() throws Throwable {
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assertThrows(IndexOutOfBoundsException.class, () ->
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testEnum(E1.B, -1, -1, "B")
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); //OK
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assertThrows(IndexOutOfBoundsException.class, () ->
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testEnum(E1.B, 2, -1, "B")
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);
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}
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@Test
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public void testIncorrectTypeStartIndex() throws Throwable {
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assertThrows(IndexOutOfBoundsException.class, () ->
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testType("", -1, -1, "")
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);
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assertThrows(IndexOutOfBoundsException.class, () ->
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testType("", 2, -1, "")
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);
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}
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@Test
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public void testHiddenClassAsCaseLabel() throws Throwable {
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MethodHandles.Lookup lookup = MethodHandles.lookup();
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byte[] classBytes = createClass();
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Class<?> classA = lookup.defineHiddenClass(classBytes, false).lookupClass();
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Class<?> classB = lookup.defineHiddenClass(classBytes, false).lookupClass();
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Object[] labels = new Object[] {
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classA,
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classB,
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};
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testType(classA.getConstructor().newInstance(), 0, 0, labels);
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testType(classB.getConstructor().newInstance(), 0, 1, labels);
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}
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private static byte[] createClass() {
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return ClassFile.of().build(ClassDesc.of("C"), clb -> {
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clb.withFlags(AccessFlag.SYNTHETIC)
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.withMethodBody("<init>",
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MethodTypeDesc.of(ConstantDescs.CD_void),
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ClassFile.ACC_PUBLIC,
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cb -> {
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cb.aload(0);
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cb.invokespecial(ConstantDescs.CD_Object,
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"<init>",
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MethodTypeDesc.of(ConstantDescs.CD_void));
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cb.return_();
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});
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});
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}
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@Test
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public void testNullLookup() throws Throwable {
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assertThrows(NullPointerException.class, () -> {
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MethodType switchType = MethodType.methodType(int.class, Object.class, int.class);
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BSM_TYPE_SWITCH.invoke(null, "", switchType, Object.class);
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});
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enum E {}
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assertThrows(NullPointerException.class, () -> {
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MethodType switchType = MethodType.methodType(int.class, E.class, int.class);
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BSM_ENUM_SWITCH.invoke(null, "", switchType,
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new Object[] {});
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});
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assertThrows(NullPointerException.class, () -> {
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MethodType switchType = MethodType.methodType(int.class, E.class, int.class);
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BSM_ENUM_SWITCH.invoke(null, "", switchType,
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new Object[] {"A"});
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});
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}
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}
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