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
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22  */
23 
24 /*
25  * @test
26  * @modules jdk.incubator.code
27  * @library ../
28  * @run junit TestNestedCapturingLambda
29  * @run main Unreflect TestNestedCapturingLambda
30  * @run junit TestNestedCapturingLambda
31  */
32 
33 import jdk.incubator.code.Reflect;
34 import jdk.incubator.code.Op;
35 import jdk.incubator.code.bytecode.BytecodeGenerator;
36 import jdk.incubator.code.dialect.core.CoreOp;
37 import org.junit.jupiter.api.Assertions;
38 import org.junit.jupiter.api.Test;
39 
40 import java.lang.invoke.MethodHandle;
41 import java.lang.invoke.MethodHandles;
42 import java.lang.reflect.Method;
43 import java.util.Optional;
44 import java.util.function.IntSupplier;
45 import java.util.stream.Stream;
46 
47 public class TestNestedCapturingLambda {
48 
49     @FunctionalInterface
50     @Reflect
51     interface QIntSupplier extends IntSupplier {
52     }
53 
54     @Reflect
55     static public int f(int a) {
56         if (a > 0) {
57             QIntSupplier s = () -> a;
58             test(s, a);
59             return s.getAsInt();
60         } else {
61             return 0;
62         }
63     }
64 
65     static void test(QIntSupplier s, int a) {
66         @SuppressWarnings("unchecked")
67         CoreOp.Var<Integer> capture = (CoreOp.Var<Integer>) Op.ofLambda(s).get().capturedValues().values().iterator().next();
68         Assertions.assertEquals(a, capture.value().intValue());
69     }
70 
71     @Test
72     public void testf() throws Throwable {
73         CoreOp.FuncOp f = getFuncOp("f");
74 
75         MethodHandle mh = generate(f);
76 
77         Assertions.assertEquals(f(42), (int) mh.invoke(42));
78         Assertions.assertEquals(f(-1), (int) mh.invoke(-1));
79     }
80 
81     static MethodHandle generate(CoreOp.FuncOp f) {
82         System.out.println(f.toText());
83 
84         return BytecodeGenerator.generate(MethodHandles.lookup(), f);
85     }
86 
87     static CoreOp.FuncOp getFuncOp(String name) {
88         Optional<Method> om = Stream.of(TestNestedCapturingLambda.class.getDeclaredMethods())
89                 .filter(m -> m.getName().equals(name))
90                 .findFirst();
91 
92         Method m = om.get();
93         return Op.ofMethod(m).get();
94     }
95 }