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 jdk.incubator.code.dialect.core.CoreOp; 28 import jdk.incubator.code.bytecode.BytecodeLift; 29 import jdk.incubator.code.interpreter.Interpreter; 30 31 import java.lang.invoke.MethodHandles; 32 import java.lang.reflect.InvocationHandler; 33 import java.lang.reflect.Proxy; 34 import java.net.URL; 35 import java.util.function.Function; 36 37 /* 38 * @test 39 * @modules jdk.incubator.code 40 * @run testng TestLiftExample 41 */ 42 43 public class TestLiftExample { 44 45 public static <T, R> Function<T, R> proxy(Function<T, R> f) { 46 @SuppressWarnings("unchecked") 47 Function<T, R> pf = (Function<T, R>) Proxy.newProxyInstance( 48 TestLiftExample.class.getClassLoader(), 49 new Class[]{Function.class}, 50 // @@@ Change to lambda 51 handler(f)); 52 return pf; 53 } 54 55 static InvocationHandler handler(Function<?, ?> f) { 56 return (proxy, method, args) -> { 57 if (method.getName().equals("apply")) { 58 int r = (int) method.invoke(f, args); 59 return r + 1; 60 } else { 61 return method.invoke(f, args); 62 } 63 }; 64 } 65 66 @Test 67 public void testF() throws Throwable { 68 URL resource = TestLiftExample.class.getClassLoader().getResource(TestLiftExample.class.getName().replace('.', '/') + ".class"); 69 byte[] classdata = resource.openStream().readAllBytes(); 70 CoreOp.FuncOp flift = BytecodeLift.lift(classdata, "proxy"); 71 System.out.println(flift.toText()); 72 73 Function<Integer, Integer> f = i -> i; 74 @SuppressWarnings("unchecked") 75 Function<Integer, Integer> pf = (Function<Integer, Integer>) Interpreter.invoke(MethodHandles.lookup(), 76 flift, f); 77 78 Assert.assertEquals((int) pf.apply(1), 2); 79 } 80 }