1 /*

     2  * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 6622260

    27  * @summary javap prints negative bytes incorrectly in hex

    28  */

    29 

    30 import java.io.*;

    31 

    32 public class T6622260 {

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

    34         new T6622260().run();

    35     }

    36 

    37     public void run() throws IOException {

    38         File javaFile = writeTestFile();

    39         File classFile = compileTestFile(javaFile);

    40         modifyClassFile(classFile);

    41         String output = javap(classFile);

    42         verify(output);

    43     }

    44 

    45     File writeTestFile() throws IOException {

    46         File f = new File("Test.java");

    47         PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f)));

    48         out.println("@Deprecated class Test { int f; void m() { } }");

    49         out.close();

    50         return f;

    51     }

    52 

    53     File compileTestFile(File f) {

    54         int rc = com.sun.tools.javac.Main.compile(new String[] { f.getPath() });

    55         if (rc != 0)

    56             throw new Error("compilation failed. rc=" + rc);

    57         String path = f.getPath();

    58         return new File(path.substring(0, path.length() - 5) + ".class");

    59     }

    60 

    61     void modifyClassFile(File f) throws IOException {

    62         String newAttributeName = "NonstandardAttribute";

    63         byte[] newAttributeData = { 0, 1, 2, 127, (byte)128, (byte)129, (byte)254, (byte)255 };

    64 

    65         DataInputStream in = new DataInputStream(new FileInputStream(f));

    66         byte[] data = new byte[(int) f.length()];

    67         in.readFully(data);

    68         in.close();

    69 

    70         in = new DataInputStream(new ByteArrayInputStream(data));

    71         in.skipBytes(4); // magic

    72         in.skipBytes(2); // minor

    73         in.skipBytes(2); // minor

    74 

    75         int constantPoolPos = data.length - in.available();

    76         int constant_pool_count = skipConstantPool(in);

    77 

    78         int flagsPos = data.length - in.available();

    79         in.skipBytes(2); // access_flags

    80         in.skipBytes(2); // this_class

    81         in.skipBytes(2); // super_class

    82 

    83         int interfaces_count = in.readUnsignedShort();

    84         in.skipBytes(interfaces_count * 2);

    85 

    86         int field_count = in.readUnsignedShort();

    87         for (int i = 0; i < field_count; i++) {

    88             in.skipBytes(6); // access_flags, name_index, descriptor_index

    89             skipAttributes(in);

    90         }

    91 

    92         int method_count = in.readUnsignedShort();

    93         for (int i = 0; i < method_count; i++) {

    94             in.skipBytes(6); // access_flags, name_index, descriptor_index

    95             skipAttributes(in);

    96         }

    97 

    98         int classAttributesPos = data.length - in.available();

    99         int attributes_count = in.readUnsignedShort();

   100 

   101         f.renameTo(new File(f.getPath() + ".BAK"));

   102         DataOutputStream out = new DataOutputStream(new FileOutputStream(f));

   103 

   104         // copy head

   105         out.write(data, 0, constantPoolPos);

   106 

   107         // copy constant pool, adding in name of new attribute

   108         out.writeShort(constant_pool_count + 1);

   109         out.write(data, constantPoolPos + 2, flagsPos - constantPoolPos - 2);

   110         out.write(1); // CONSTANT_Utf8

   111         out.writeUTF(newAttributeName);

   112 

   113         // copy flags, class, superclass, interfaces, fields and methods

   114         out.write(data, flagsPos, classAttributesPos - flagsPos);

   115 

   116         // copy class attributes, adding in new attribute

   117         out.writeShort(attributes_count + 1);

   118         out.write(data, classAttributesPos + 2, data.length - classAttributesPos - 2);

   119         out.writeShort(constant_pool_count); // index of new attribute name

   120         out.writeInt(newAttributeData.length);

   121         out.write(newAttributeData);

   122         out.close();

   123     }

   124 

   125     int skipConstantPool(DataInputStream in) throws IOException {

   126         int constant_pool_count = in.readUnsignedShort();

   127         for (int i = 1; i < constant_pool_count; i++) {

   128             int tag = in.readUnsignedByte();

   129             switch (tag) {

   130             case  1: // CONSTANT_Utf8

   131                 int length = in.readUnsignedShort();

   132                 in.skipBytes(length); // bytes

   133                 break;

   134 

   135             case  3: // CONSTANT_Integer

   136             case  4: // CONSTANT_Float

   137                 in.skipBytes(4); // bytes

   138                 break;

   139 

   140             case  5: // CONSTANT_Long

   141             case  6: // CONSTANT_Double

   142                 in.skipBytes(8); // high_bytes, low_bytes

   143                 break;

   144 

   145             case  7: // CONSTANT_Class

   146                 in.skipBytes(2); // name_index

   147                 break;

   148 

   149             case  8: // CONSTANT_String

   150                 in.skipBytes(2); // string_index

   151                 break;

   152 

   153             case  9: // CONSTANT_FieldRef

   154             case 10: // CONSTANT_Methodref

   155             case 11: // CONSTANT_InterfaceMethodref

   156                 in.skipBytes(4); // class_index, name_and_type_index

   157                 break;

   158 

   159             case 12: // CONSTANT_NameAndType

   160                 in.skipBytes(4); // name_index, descriptor_index

   161                 break;

   162 

   163             default:

   164                 throw new Error("constant pool tag: " + tag);

   165             }

   166         }

   167         return constant_pool_count;

   168     }

   169 

   170     int skipAttributes(DataInputStream in) throws IOException {

   171         int attributes_count = in.readUnsignedShort();

   172         for (int i = 0; i < attributes_count; i++) {

   173             in.skipBytes(2); // attribute_name_index;

   174             int length = in.readInt();

   175             in.skipBytes(length); // info

   176         }

   177         return attributes_count;

   178     }

   179 

   180     String javap(File f) {

   181         StringWriter sw = new StringWriter();

   182         PrintWriter out = new PrintWriter(sw);

   183         int rc = com.sun.tools.javap.Main.run(new String[] { "-v", f.getPath() }, out);

   184         if (rc != 0)

   185             throw new Error("javap failed. rc=" + rc);

   186         out.close();

   187         return sw.toString();

   188     }

   189 

   190     void verify(String output) {

   191         System.out.println(output);

   192         if (output.indexOf("-") >= 0)

   193             throw new Error("- found in output");

   194         if (output.indexOf("FFFFFF") >= 0)

   195             throw new Error("FFFFFF found in output");

   196     }

   197 }