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 java.lang.reflect.code.CopyContext;
28 import java.lang.reflect.code.OpTransformer;
29 import java.lang.reflect.code.op.CoreOp;
30 import java.lang.reflect.code.Op;
31 import java.lang.reflect.code.Quoted;
32 import java.lang.reflect.code.analysis.SSA;
33 import java.lang.reflect.code.interpreter.Interpreter;
34 
35 /*
36  * @test
37  * @run testng TestExpressionElimination
38  */
39 
40 public class TestExpressionElimination {
41 
42     @Test
43     public void testAddZero() {
44         CoreOp.ClosureOp lf = generate((double a) -> a + 0.0);
45 
46         Assert.assertEquals((double) Interpreter.invoke(lf, 1.0d), 1.0d);
47     }
48 
49     @Test
50     public void testF() {
51         CoreOp.ClosureOp lf = generate((double a, double b) -> -a + b);
52 
53         Assert.assertEquals((double) Interpreter.invoke(lf, 1.0d, 1.0d), 0.0d);
54     }
55 
56     static CoreOp.ClosureOp generate(Quoted q) {
57         return generateF((CoreOp.ClosureOp) q.op());
58     }
59 
60     static <T extends Op & Op.Invokable> T generateF(T f) {
61         f.writeTo(System.out);
62 
63         @SuppressWarnings("unchecked")
64         T lf = (T) f.transform(CopyContext.create(), OpTransformer.LOWERING_TRANSFORMER);
65         lf.writeTo(System.out);
66 
67         lf = SSA.transform(lf);
68         lf.writeTo(System.out);
69 
70         lf = ExpressionElimination.eliminate(lf);
71         lf.writeTo(System.out);
72         return lf;
73     }
74 }