1 /* 2 * Copyright (c) 2024, 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 24 import org.testng.Assert; 25 import org.testng.annotations.Test; 26 27 import java.lang.reflect.code.op.CoreOp; 28 import java.lang.reflect.code.bytecode.BytecodeLift; 29 import java.lang.reflect.code.interpreter.Interpreter; 30 import java.lang.invoke.MethodHandles; 31 import java.lang.reflect.InvocationHandler; 32 import java.lang.reflect.Proxy; 33 import java.net.URL; 34 import java.util.function.Function; 35 36 /* 37 * @test 38 * @run testng TestLiftExample 39 */ 40 41 public class TestLiftExample { 42 43 public static <T, R> Function<T, R> proxy(Function<T, R> f) { 44 @SuppressWarnings("unchecked") 45 Function<T, R> pf = (Function<T, R>) Proxy.newProxyInstance( 46 TestLiftExample.class.getClassLoader(), 47 new Class[]{Function.class}, 48 // @@@ Change to lambda 49 handler(f)); 50 return pf; 51 } 52 53 static InvocationHandler handler(Function<?, ?> f) { 54 return (proxy, method, args) -> { 55 if (method.getName().equals("apply")) { 56 int r = (int) method.invoke(f, args); 57 return r + 1; 58 } else { 59 return method.invoke(f, args); 60 } 61 }; 62 } 63 64 @Test 65 public void testF() throws Throwable { 66 URL resource = TestLiftExample.class.getClassLoader().getResource(TestLiftExample.class.getName().replace('.', '/') + ".class"); 67 byte[] classdata = resource.openStream().readAllBytes(); 68 CoreOp.FuncOp flift = BytecodeLift.lift(classdata, "proxy"); 69 flift.writeTo(System.out); 70 71 Function<Integer, Integer> f = i -> i; 72 @SuppressWarnings("unchecked") 73 Function<Integer, Integer> pf = (Function<Integer, Integer>) Interpreter.invoke(MethodHandles.lookup(), 74 flift, f); 75 76 Assert.assertEquals((int) pf.apply(1), 2); 77 } 78 }