1 /*
 2  * Copyright (c) 2026, 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 /*
25  * @test
26  * @modules jdk.incubator.code
27  * @run junit TestSuccessorValidation
28  */
29 
30 import jdk.incubator.code.Block;
31 import jdk.incubator.code.Op;
32 import jdk.incubator.code.dialect.core.CoreOp;
33 import jdk.incubator.code.dialect.core.CoreType;
34 import jdk.incubator.code.dialect.java.JavaType;
35 import org.junit.jupiter.api.Assertions;
36 import org.junit.jupiter.api.Test;
37 
38 import java.util.Collections;
39 
40 public class TestSuccessorValidation {
41 
42     @Test
43     void testNumArgsLtNumParams() {
44         Assertions.assertThrows(IllegalStateException.class, () -> generateModel(0));
45     }
46 
47     @Test
48     void testNumArgsGtNumParams() {
49         Assertions.assertThrows(IllegalStateException.class, () -> generateModel(2));
50     }
51 
52     @Test
53     void testNumArgsEqNumParams() {
54         Assertions.assertDoesNotThrow(() -> generateModel(1));
55     }
56 
57     private static CoreOp.FuncOp generateModel(int numOfArgs) {
58         // generates a model with two blocks, entry block and another block with one param
59         // in the entry block we branch to the other block with the specified number of args
60         return CoreOp.func("m", CoreType.FUNCTION_TYPE_VOID).body(eb -> {
61             Block.Builder b2 = eb.block(JavaType.INT);
62             Op.Result v = eb.add(CoreOp.constant(JavaType.INT, 1));
63             eb.add(CoreOp.branch(b2.reference(Collections.nCopies(numOfArgs, v))));
64 
65             b2.add(CoreOp.return_());
66         });
67     }
68 }