jdk8-mips64-public/langtools: test/tools/javap/T6622260.java@93012e2a5d1d (annotated)

test/tools/javap/T6622260.java@93012e2a5d1d (annotated)

test/tools/javap/T6622260.java

Sat, 07 Nov 2020 10:30:02 +0800

author: aoqi
date: Sat, 07 Nov 2020 10:30:02 +0800
changeset 3938: 93012e2a5d1d
parent 2525: 2eb010b6cb22
permissions: -rw-r--r--

Added tag mips-jdk8u275-b01 for changeset eb6ee6a5f2fe

 /*
  * Copyright (c) 2008, 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 6622260
  * @summary javap prints negative bytes incorrectly in hex
  */
 import java.io.*;
 public class T6622260 {
     public static void main(String[] args) throws Exception {
         new T6622260().run();
     }
     public void run() throws IOException {
         File javaFile = writeTestFile();
         File classFile = compileTestFile(javaFile);
         modifyClassFile(classFile);
         String output = javap(classFile);
         verify(output);
     }
     File writeTestFile() throws IOException {
         File f = new File("Test.java");
         PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f)));
         out.println("@Deprecated class Test { int f; void m() { } }");
         out.close();
         return f;
     }
     File compileTestFile(File f) {
         int rc = com.sun.tools.javac.Main.compile(new String[] { f.getPath() });
         if (rc != 0)
             throw new Error("compilation failed. rc=" + rc);
         String path = f.getPath();
         return new File(path.substring(0, path.length() - 5) + ".class");
     }
     void modifyClassFile(File f) throws IOException {
         String newAttributeName = "NonstandardAttribute";
         byte[] newAttributeData = { 0, 1, 2, 127, (byte)128, (byte)129, (byte)254, (byte)255 };
         DataInputStream in = new DataInputStream(new FileInputStream(f));
         byte[] data = new byte[(int) f.length()];
         in.readFully(data);
         in.close();
         in = new DataInputStream(new ByteArrayInputStream(data));
         in.skipBytes(4); // magic
         in.skipBytes(2); // minor
         in.skipBytes(2); // minor
         int constantPoolPos = data.length - in.available();
         int constant_pool_count = skipConstantPool(in);
         int flagsPos = data.length - in.available();
         in.skipBytes(2); // access_flags
         in.skipBytes(2); // this_class
         in.skipBytes(2); // super_class
         int interfaces_count = in.readUnsignedShort();
         in.skipBytes(interfaces_count * 2);
         int field_count = in.readUnsignedShort();
         for (int i = 0; i < field_count; i++) {
             in.skipBytes(6); // access_flags, name_index, descriptor_index
             skipAttributes(in);
         }
         int method_count = in.readUnsignedShort();
         for (int i = 0; i < method_count; i++) {
             in.skipBytes(6); // access_flags, name_index, descriptor_index
             skipAttributes(in);
         }
         int classAttributesPos = data.length - in.available();
         int attributes_count = in.readUnsignedShort();
         f.renameTo(new File(f.getPath() + ".BAK"));
         DataOutputStream out = new DataOutputStream(new FileOutputStream(f));
         // copy head
         out.write(data, 0, constantPoolPos);
         // copy constant pool, adding in name of new attribute
         out.writeShort(constant_pool_count + 1);
         out.write(data, constantPoolPos + 2, flagsPos - constantPoolPos - 2);
         out.write(1); // CONSTANT_Utf8
         out.writeUTF(newAttributeName);
         // copy flags, class, superclass, interfaces, fields and methods
         out.write(data, flagsPos, classAttributesPos - flagsPos);
         // copy class attributes, adding in new attribute
         out.writeShort(attributes_count + 1);
         out.write(data, classAttributesPos + 2, data.length - classAttributesPos - 2);
         out.writeShort(constant_pool_count); // index of new attribute name
         out.writeInt(newAttributeData.length);
         out.write(newAttributeData);
         out.close();
     }
     int skipConstantPool(DataInputStream in) throws IOException {
         int constant_pool_count = in.readUnsignedShort();
         for (int i = 1; i < constant_pool_count; i++) {
             int tag = in.readUnsignedByte();
             switch (tag) {
             case  1: // CONSTANT_Utf8
                 int length = in.readUnsignedShort();
                 in.skipBytes(length); // bytes
                 break;
             case  3: // CONSTANT_Integer
             case  4: // CONSTANT_Float
                 in.skipBytes(4); // bytes
                 break;
             case  5: // CONSTANT_Long
             case  6: // CONSTANT_Double
                 in.skipBytes(8); // high_bytes, low_bytes
                 break;
             case  7: // CONSTANT_Class
                 in.skipBytes(2); // name_index
                 break;
             case  8: // CONSTANT_String
                 in.skipBytes(2); // string_index
                 break;
             case  9: // CONSTANT_FieldRef
             case 10: // CONSTANT_Methodref
             case 11: // CONSTANT_InterfaceMethodref
                 in.skipBytes(4); // class_index, name_and_type_index
                 break;
             case 12: // CONSTANT_NameAndType
                 in.skipBytes(4); // name_index, descriptor_index
                 break;
             default:
                 throw new Error("constant pool tag: " + tag);
             }
         }
         return constant_pool_count;
     }
     int skipAttributes(DataInputStream in) throws IOException {
         int attributes_count = in.readUnsignedShort();
         for (int i = 0; i < attributes_count; i++) {
             in.skipBytes(2); // attribute_name_index;
             int length = in.readInt();
             in.skipBytes(length); // info
         }
         return attributes_count;
     }
     String javap(File f) {
         StringWriter sw = new StringWriter();
         PrintWriter out = new PrintWriter(sw);
         int rc = com.sun.tools.javap.Main.run(new String[] { "-v", f.getPath() }, out);
         if (rc != 0)
             throw new Error("javap failed. rc=" + rc);
         out.close();
         return sw.toString();
     }
     void verify(String output) {
         System.out.println(output);
         output = output.substring(output.indexOf("Test.java"));
         if (output.indexOf("-") >= 0)
             throw new Error("- found in output");
         if (output.indexOf("FFFFFF") >= 0)
             throw new Error("FFFFFF found in output");
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

test/tools/javap/T6622260.java@93012e2a5d1d (annotated)

test/tools/javap/T6622260.java