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 jdk.incubator.code.Block;
25 import jdk.incubator.code.CodeReflection;
26 import jdk.incubator.code.Op;
27 import jdk.incubator.code.OpTransformer;
28 import jdk.incubator.code.dialect.core.CoreOp;
29 import org.junit.jupiter.api.Assertions;
30 import org.junit.jupiter.api.Test;
31 
32 import java.lang.reflect.Method;
33 import java.util.Optional;
34 import java.util.concurrent.atomic.AtomicBoolean;
35 import java.util.stream.Stream;
36 
37 /*
38  * @test
39  * @modules jdk.incubator.code
40  * @run junit TestBlockIndexes
41  */
42 
43 public class TestBlockIndexes {
44 
45     @CodeReflection
46     static int f(int[] a) {
47         int sum = 0;
48         for (int i = 0; i < a.length; i++) {
49             sum += a[i];
50         }
51         return sum;
52     }
53 
54     @Test
55     public void testBlockIndexes() {
56         CoreOp.FuncOp f = getFuncOp("f");
57         f = f.transform(OpTransformer.LOWERING_TRANSFORMER);
58         assertBlockIndexes(f);
59 
60         AtomicBoolean first = new AtomicBoolean(true);
61         f = f.transform((block, op) -> {
62             if (first.getAndSet(false)) {
63                 // Create some blocks without predecessors
64                 for (int i = 0; i < 5; i++) {
65                     Block.Builder redundant = block.block();
66                     redundant.op(CoreOp.return_());
67                 }
68             }
69             block.op(op);
70             return block;
71         });
72         assertBlockIndexes(f);
73     }
74 
75     static void assertBlockIndexes(CoreOp.FuncOp f) {
76         for (Block b : f.body().blocks()) {
77             Assertions.assertEquals(b.ancestorBody().blocks().indexOf(b), b.index());
78         }
79     }
80 
81     static CoreOp.FuncOp getFuncOp(String name) {
82         Optional<Method> om = Stream.of(TestBlockIndexes.class.getDeclaredMethods())
83                 .filter(m -> m.getName().equals(name))
84                 .findFirst();
85 
86         Method m = om.get();
87         return Op.ofMethod(m).get();
88     }
89 }