/*
* Copyright (c) 2008, 2016, 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 6622260
* @summary javap prints negative bytes incorrectly in hex
* @modules jdk.jdeps/com.sun.tools.javap
*/
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");
}
}