1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 import static java.lang.invoke.MethodType.methodType; 18 19 import java.lang.invoke.MethodHandle; 20 import java.lang.invoke.MethodHandles; 21 import java.lang.invoke.VarHandle; 22 23 public class Main { 24 main(String[] args)25 public static void main(String[] args) throws Throwable { 26 testMethodHandleStaticFieldGet(); 27 testMethodHandleStaticFieldPut(); 28 testMethodHandleStaticMethod(); 29 testVarHandleStaticFieldGet(); 30 testVarHandleStaticFieldPut(); 31 } 32 testMethodHandleStaticFieldGet()33 private static void testMethodHandleStaticFieldGet() throws Throwable { 34 MethodHandle mh = MethodHandles.lookup() 35 .findStaticGetter(MHStaticGetter.class, "a", int.class); 36 37 int actual = (int) mh.invokeExact(); 38 39 assertEquals(actual, 10); 40 assertEquals(MHStaticGetter.b, 12); 41 } 42 43 testMethodHandleStaticFieldPut()44 private static void testMethodHandleStaticFieldPut() throws Throwable { 45 MethodHandle mh = MethodHandles.lookup() 46 .findStaticSetter(MHStaticSetter.class, "a", int.class); 47 48 mh.invokeExact(100); 49 50 assertEquals(MHStaticSetter.a, 100); 51 assertEquals(MHStaticGetter.b, 12); 52 } 53 testMethodHandleStaticMethod()54 private static void testMethodHandleStaticMethod() throws Throwable { 55 MethodHandle mh = MethodHandles.lookup() 56 .findStatic(MHStaticMethod.class, "getB", methodType(int.class)); 57 58 int actualB = (int) mh.invokeExact(); 59 60 assertEquals(actualB, 12); 61 assertEquals(MHStaticMethod.a, 10); 62 } 63 testVarHandleStaticFieldGet()64 private static void testVarHandleStaticFieldGet() throws Throwable { 65 VarHandle vh = MethodHandles.lookup() 66 .findStaticVarHandle(VHStaticGet.class, "a", int.class); 67 68 int actual = (int) vh.get(); 69 70 assertEquals(actual, 10); 71 assertEquals(VHStaticGet.b, 12); 72 } 73 testVarHandleStaticFieldPut()74 private static void testVarHandleStaticFieldPut() throws Throwable { 75 VarHandle vh = MethodHandles.lookup() 76 .findStaticVarHandle(VHStaticGet.class, "a", int.class); 77 78 vh.set(100); 79 80 assertEquals(VHStaticGet.a, 100); 81 assertEquals(VHStaticGet.b, 12); 82 } 83 assertEquals(int actual, int expected)84 private static void assertEquals(int actual, int expected) { 85 if (actual != expected) { 86 throw new AssertionError("Expected: " + expected + ", but got: " + actual); 87 } 88 } 89 } 90