/*

 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 * questions.

 */

/*

 * @test

 * @bug 8009170

 * @summary Regression: javac generates redundant bytecode in assignop involving

 * arrays

 * @run main RedundantByteCodeInArrayTest

 */

import java.io.File;

import java.io.IOException;

import com.sun.tools.classfile.Attribute;

import com.sun.tools.classfile.ClassFile;

import com.sun.tools.classfile.Code_attribute;

import com.sun.tools.classfile.Code_attribute.InvalidIndex;

import com.sun.tools.classfile.ConstantPool;

import com.sun.tools.classfile.ConstantPoolException;

import com.sun.tools.classfile.Descriptor.InvalidDescriptor;

import com.sun.tools.classfile.Method;

public class RedundantByteCodeInArrayTest {

    public static void main(String[] args)

            throws IOException, ConstantPoolException, InvalidDescriptor, InvalidIndex {

        new RedundantByteCodeInArrayTest()

                .checkClassFile(new File(System.getProperty("test.classes", "."),

                    RedundantByteCodeInArrayTest.class.getName() + ".class"));

    }

    void arrMethod(int[] array, int p, int inc) {

        array[p] += inc;

    }

    void checkClassFile(File file)

            throws IOException, ConstantPoolException, InvalidDescriptor, InvalidIndex {

        ClassFile classFile = ClassFile.read(file);

        ConstantPool constantPool = classFile.constant_pool;

        //lets get all the methods in the class file.

        for (Method method : classFile.methods) {

            if (method.getName(constantPool).equals("arrMethod")) {

                Code_attribute code = (Code_attribute) method.attributes

                        .get(Attribute.Code);

                if (code.max_locals > 4)

                    throw new AssertionError("Too many locals for method arrMethod");

            }

        }

    }

}