/*

 * Copyright (c) 2005, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/**

 *  @test

 *  @bug 5024104

 *  @summary Test ReferenceType.majorVersion(), minorVersion, constantPoolCount and ConstantPool apis.

 *

 *  @author Swamy Venkataramanappa

 *

 *  @run build TestScaffold VMConnection

 *  @run compile -g ConstantPoolInfo.java

 *  @run main ConstantPoolInfo

 */

import com.sun.jdi.*;

import com.sun.jdi.event.*;

import com.sun.jdi.request.*;

import java.util.*;

import java.io.*;

    /********** target program **********/

class ConstantPoolTarg {

    public static void main(String[] args){

        System.out.println("Howdy!"); // don't change the string value "Howdy!" it is

                                      // used to test the constant pool entry

    }

}

    /********** test program **********/

public class ConstantPoolInfo extends TestScaffold {

    ReferenceType targetClass;

    ThreadReference mainThread;

    int cpool_count;

    byte[] cpbytes;

    static int expectedMajorVersion;

    static int expectedMinorVersion;

    static int expectedCpoolCount;

    /* Class File Constants */

    public static final int JAVA_MAGIC                   = 0xcafebabe;

    /* Constant table :  copied from sun/javap */

    public static final int CONSTANT_UTF8                = 1;

    public static final int CONSTANT_UNICODE             = 2;

    public static final int CONSTANT_INTEGER             = 3;

    public static final int CONSTANT_FLOAT               = 4;

    public static final int CONSTANT_LONG                = 5;

    public static final int CONSTANT_DOUBLE              = 6;

    public static final int CONSTANT_CLASS               = 7;

    public static final int CONSTANT_STRING              = 8;

    public static final int CONSTANT_FIELD               = 9;

    public static final int CONSTANT_METHOD              = 10;

    public static final int CONSTANT_INTERFACEMETHOD     = 11;

    public static final int CONSTANT_NAMEANDTYPE         = 12;

    ConstantPoolInfo (String args[]) {

        super(args);

    }

    public static void main(String[] args)      throws Exception {

        new ConstantPoolInfo(args).startTests();

    }

    /********** test core **********/

    protected void runTests() throws Exception {

        /*

         * Get to the top of main()

         * to determine targetClass and mainThread

         */

        BreakpointEvent bpe = startToMain("ConstantPoolTarg");

        targetClass = bpe.location().declaringType();

        mainThread = bpe.thread();

        String targPathname = System.getProperty("test.classes") + File.separator + "ConstantPoolTarg.class";

        readClassData(new FileInputStream(targPathname));

        /* Test constant pool apis

         */

        if (vm().canGetClassFileVersion()) {

            if (expectedMajorVersion != targetClass.majorVersion()) {

                failure("unexpected major version: actual value: " + targetClass.majorVersion()

                        + "expected value :" + expectedMajorVersion);

            }

            if (expectedMinorVersion != targetClass.minorVersion()) {

                failure("unexpected minor version: actual value: " + targetClass.minorVersion()

                        + "expected value :" + expectedMinorVersion);

            }

        } else {

            System.out.println("can get class version not supported");

        }

        if (vm().canGetConstantPool()) {

            cpool_count = targetClass.constantPoolCount();

            cpbytes = targetClass.constantPool();

            try {

                printcp();

            } catch (IOException x){

                System.out.println("IOexception reading cpool bytes " + x);

            }

            if (expectedCpoolCount != cpool_count) {

                failure("unexpected constant pool count: actual value: " + cpool_count

                        + "expected value :" + expectedCpoolCount);

            }

        } else {

            System.out.println("can get constant pool version not supported");

        }

        /*

         * resume until end

         */

        listenUntilVMDisconnect();

        /*

         * deal with results of test

         * if anything has called failure("foo") testFailed will be true

         */

        if (!testFailed) {

            println("ConstantPoolInfo: passed");

        } else {

            throw new Exception("ConstantPoolInfo: failed");

        }

    }

    public void printcp() throws IOException {

        boolean found = false;

        ByteArrayInputStream bytesStream = new ByteArrayInputStream(cpbytes);

        DataInputStream in = new DataInputStream(bytesStream);

        for (int i = 1; i < cpool_count; i++) {

            int tag = in.readByte();

            System.out.print("const #" + i + ":   ");

            switch(tag) {

                    case CONSTANT_UTF8:

                    String str=in.readUTF();

                    System.out.println("Asciz " + str);

                    // "Howdy!" is an expected constant pool entry

                    // of test program. It should exist.

                    if (str.compareTo("Howdy!") == 0) {

                        found = true;

                    }

                    break;

                case CONSTANT_INTEGER:

                    System.out.println("int " + in.readInt());

                    break;

                case CONSTANT_FLOAT:

                    System.out.println("Float " + in.readFloat());

                    break;

                case CONSTANT_LONG:

                    System.out.println("Long " + in.readLong());

                    break;

                case CONSTANT_DOUBLE:

                    System.out.println("Double " + in.readDouble());

                    break;

                case CONSTANT_CLASS:

                    System.out.println("Class " + in.readUnsignedShort());

                    break;

                case CONSTANT_STRING:

                    System.out.println("String " + in.readUnsignedShort());

                    break;

                case CONSTANT_FIELD:

                    System.out.println("Field " + in.readUnsignedShort() + " " + in.readUnsignedShort());

                    break;

                case CONSTANT_METHOD:

                    System.out.println("Method " + in.readUnsignedShort() + " " + in.readUnsignedShort());

                    break;

                case CONSTANT_INTERFACEMETHOD:

                    System.out.println("InterfaceMethod " + in.readUnsignedShort() + " " + in.readUnsignedShort());

                    break;

                case CONSTANT_NAMEANDTYPE:

                    System.out.println("NameAndType " + in.readUnsignedShort() + " " + in.readUnsignedShort());

                    break;

                case 0:

                default:

                    System.out.println("class format error");

            }

        }

        if (!found) {

            failure("expected string \"Howdy!\" not found in constant pool");

        }

    }

    /**

     * Read classfile

     */

    void readClassData(InputStream infile){

        try{

            this.read(new DataInputStream(infile));

        }catch (FileNotFoundException ee) {

            failure("cant read file");

        }catch (Error ee) {

            ee.printStackTrace();

            failure("fatal error");

        } catch (Exception ee) {

            ee.printStackTrace();

            failure("fatal exception");

        }

    }

        /**

         * Read major, minor and cp count.

         */

    public void read(DataInputStream in) throws IOException {

        int magic = in.readInt();

        if (magic != JAVA_MAGIC) {

            failure("fatal bad class file format");

        }

        expectedMinorVersion = in.readShort();;

        expectedMajorVersion = in.readShort();

        expectedCpoolCount = in.readUnsignedShort();

        in.close();

    } // end read()

}