1 /*
 2  * Copyright (c) 2024, 2025, 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 jdk.incubator.code.dialect.core.CoreOp;
25 import jdk.incubator.code.interpreter.Interpreter;
26 import org.junit.jupiter.api.Assertions;
27 import org.junit.jupiter.api.Test;
28 
29 import java.lang.invoke.MethodHandles;
30 import java.lang.reflect.InvocationHandler;
31 import java.lang.reflect.Proxy;
32 import java.net.URL;
33 import java.util.function.Function;
34 
35 /*
36  * @test
37  * @modules jdk.incubator.code/jdk.incubator.code.internal
38  * @run junit 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         System.out.println(flift.toText());
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         Assertions.assertEquals(2, (int) pf.apply(1));
77     }
78 }