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.incubator.mvt.ValueType; 24 import jdk.incubator.mvt.ValueCapableClass; 25 import org.testng.annotations.Test; 26 27 import java.lang.invoke.MethodHandle; 28 import java.lang.invoke.MethodHandles; 29 30 import static java.lang.invoke.MethodType.methodType; 31 import static org.testng.Assert.*; 32 33 /* 34 * @test 35 * @run testng/othervm -XX:+EnableMVT -Dvalhalla.enablePoolPatches=true MethodHandlesTest 36 */ 37 38 @Test 39 public class MethodHandlesTest { 40 @ValueCapableClass 41 final class ValueCapable {} 42 43 static final ValueType<?> VT = ValueType.forClass(Point.class); 44 static final Class<?> VCC = Point.class; 45 static final Class<?> DVT = VT.valueClass(); 46 47 static final MethodHandle ID_DVT_MH = MethodHandles.identity(DVT); // (DVT)DVT 48 static final MethodHandle ID_VCC_MH = ID_DVT_MH.asType(methodType(VCC, VCC)); // (VCC)VCC 49 50 static final Object ARG = new Point(0, (short)1, (short)2); 51 52 @Test 53 void testInsertArgumentDVT() throws Throwable { 54 { 55 MethodHandle mh = MethodHandles.insertArguments(ID_DVT_MH, 0, ARG); 56 assertEquals(mh.invokeWithArguments(), ARG); 57 } 58 59 assertThrows(ClassCastException.class, 60 () -> MethodHandles.insertArguments(ID_DVT_MH, 0, new ValueCapable())); 61 62 assertThrows(NullPointerException.class, 63 () -> MethodHandles.insertArguments(ID_DVT_MH, 0, new Object[] { null })); 64 } 65 66 @Test 67 void testInsertArgumentVCC() throws Throwable { 68 assertEquals(MethodHandles.insertArguments(ID_VCC_MH, 0, ARG).invokeWithArguments(), ARG); 69 70 assertThrows(ClassCastException.class, 71 () -> MethodHandles.insertArguments(ID_VCC_MH, 0, new ValueCapable())); 72 73 { 74 MethodHandle mh = MethodHandles.insertArguments(ID_VCC_MH, 0, new Object[]{null}); 75 assertThrows(NullPointerException.class, () -> mh.invokeWithArguments()); 76 } 77 } 78 79 @Test 80 void testConstantDVT() throws Throwable { 81 assertEquals(MethodHandles.constant(DVT, ARG).type(), methodType(DVT)); 82 83 assertEquals(MethodHandles.constant(DVT, ARG).invokeWithArguments(), ARG); 84 85 assertThrows(ClassCastException.class, 86 () -> MethodHandles.constant(DVT, new Object())); 87 88 assertThrows(NullPointerException.class, 89 () -> MethodHandles.constant(DVT, null)); 90 } 91 92 @Test 93 void testBindToDVT() { 94 assertThrows(IllegalArgumentException.class, 95 () -> ID_DVT_MH.bindTo(ARG)); 96 } 97 }