RedundantByteCodeInArrayTest.java revision 2942:08092deced3f 
1/*
2 * Copyright (c) 2013, 2015, 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 * @bug 8009170
27 * @summary Regression: javac generates redundant bytecode in assignop involving
28 * arrays
29 * @modules jdk.jdeps/com.sun.tools.classfile
30 * @run main RedundantByteCodeInArrayTest
31 */
32
33import java.io.File;
34import java.io.IOException;
35
36import com.sun.tools.classfile.Attribute;
37import com.sun.tools.classfile.ClassFile;
38import com.sun.tools.classfile.Code_attribute;
39import com.sun.tools.classfile.Code_attribute.InvalidIndex;
40import com.sun.tools.classfile.ConstantPool;
41import com.sun.tools.classfile.ConstantPoolException;
42import com.sun.tools.classfile.Descriptor.InvalidDescriptor;
43import com.sun.tools.classfile.Method;
44
45public class RedundantByteCodeInArrayTest {
46    public static void main(String[] args)
47            throws IOException, ConstantPoolException, InvalidDescriptor, InvalidIndex {
48        new RedundantByteCodeInArrayTest()
49                .checkClassFile(new File(System.getProperty("test.classes", "."),
50                    RedundantByteCodeInArrayTest.class.getName() + ".class"));
51    }
52
53    void arrMethod(int[] array, int p, int inc) {
54        array[p] += inc;
55    }
56
57    void checkClassFile(File file)
58            throws IOException, ConstantPoolException, InvalidDescriptor, InvalidIndex {
59        ClassFile classFile = ClassFile.read(file);
60        ConstantPool constantPool = classFile.constant_pool;
61
62        //lets get all the methods in the class file.
63        for (Method method : classFile.methods) {
64            if (method.getName(constantPool).equals("arrMethod")) {
65                Code_attribute code = (Code_attribute) method.attributes
66                        .get(Attribute.Code);
67                if (code.max_locals > 4)
68                    throw new AssertionError("Too many locals for method arrMethod");
69            }
70        }
71    }
72}
73