1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 import jdk.experimental.value.ValueType; 24 import org.testng.annotations.Test; 25 26 import java.lang.invoke.MethodHandle; 27 import java.lang.invoke.MethodHandles; 28 29 import static java.lang.invoke.MethodType.methodType; 30 import static org.testng.Assert.*; 31 32 /* 33 * @test 34 * @run testng/othervm -Xverify:none -XX:+EnableMVT -Dvalhalla.enablePoolPatches=true MethodHandlesTest 35 */ 36 37 @Test 38 public class MethodHandlesTest { 39 @jvm.internal.value.DeriveValueType 40 final class ValueCapable {} 41 42 static final ValueType<?> VT = ValueType.forClass(Point.class); 43 static final Class<?> VCC = Point.class; 44 static final Class<?> DVT = VT.valueClass(); 45 46 static final MethodHandle ID_DVT_MH = MethodHandles.identity(DVT); // (DVT)DVT 47 static final MethodHandle ID_VCC_MH = ID_DVT_MH.asType(methodType(VCC, VCC)); // (VCC)VCC 48 49 static final Object ARG = new Point(0, (short)1, (short)2); 50 51 @Test 52 void testInsertArgumentDVT() throws Throwable { 53 { 54 MethodHandle mh = MethodHandles.insertArguments(ID_DVT_MH, 0, ARG); 55 assertEquals(mh.invokeWithArguments(), ARG); 56 } 57 58 assertThrows(ClassCastException.class, 59 () -> MethodHandles.insertArguments(ID_DVT_MH, 0, new ValueCapable())); 60 61 assertThrows(NullPointerException.class, 62 () -> MethodHandles.insertArguments(ID_DVT_MH, 0, new Object[] { null })); 63 } 64 65 @Test 66 void testInsertArgumentVCC() throws Throwable { 67 assertEquals(MethodHandles.insertArguments(ID_VCC_MH, 0, ARG).invokeWithArguments(), ARG); 68 69 assertThrows(ClassCastException.class, 70 () -> MethodHandles.insertArguments(ID_VCC_MH, 0, new ValueCapable())); 71 72 { 73 MethodHandle mh = MethodHandles.insertArguments(ID_VCC_MH, 0, new Object[]{null}); 74 assertThrows(NullPointerException.class, () -> mh.invokeWithArguments()); 75 } 76 } 77 78 @Test 79 void testConstantDVT() throws Throwable { 80 assertEquals(MethodHandles.constant(DVT, ARG).type(), methodType(DVT)); 81 82 assertEquals(MethodHandles.constant(DVT, ARG).invokeWithArguments(), ARG); 83 84 assertThrows(ClassCastException.class, 85 () -> MethodHandles.constant(DVT, new Object())); 86 87 assertThrows(NullPointerException.class, 88 () -> MethodHandles.constant(DVT, null)); 89 } 90 91 @Test 92 void testBindToDVT() { 93 assertThrows(IllegalArgumentException.class, 94 () -> ID_DVT_MH.bindTo(ARG)); 95 } 96 }