200 lines
7.0 KiB
Java
200 lines
7.0 KiB
Java
/*
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* Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6622260
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* @summary javap prints negative bytes incorrectly in hex
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* @modules jdk.jdeps/com.sun.tools.javap
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*/
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import java.io.*;
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public class T6622260 {
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public static void main(String[] args) throws Exception {
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new T6622260().run();
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}
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public void run() throws IOException {
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File javaFile = writeTestFile();
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File classFile = compileTestFile(javaFile);
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modifyClassFile(classFile);
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String output = javap(classFile);
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verify(output);
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}
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File writeTestFile() throws IOException {
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File f = new File("Test.java");
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PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f)));
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out.println("@Deprecated class Test { int f; void m() { } }");
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out.close();
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return f;
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}
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File compileTestFile(File f) {
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int rc = com.sun.tools.javac.Main.compile(new String[] { f.getPath() });
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if (rc != 0)
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throw new Error("compilation failed. rc=" + rc);
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String path = f.getPath();
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return new File(path.substring(0, path.length() - 5) + ".class");
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}
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void modifyClassFile(File f) throws IOException {
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String newAttributeName = "NonstandardAttribute";
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byte[] newAttributeData = { 0, 1, 2, 127, (byte)128, (byte)129, (byte)254, (byte)255 };
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DataInputStream in = new DataInputStream(new FileInputStream(f));
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byte[] data = new byte[(int) f.length()];
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in.readFully(data);
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in.close();
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in = new DataInputStream(new ByteArrayInputStream(data));
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in.skipBytes(4); // magic
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in.skipBytes(2); // minor
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in.skipBytes(2); // minor
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int constantPoolPos = data.length - in.available();
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int constant_pool_count = skipConstantPool(in);
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int flagsPos = data.length - in.available();
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in.skipBytes(2); // access_flags
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in.skipBytes(2); // this_class
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in.skipBytes(2); // super_class
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int interfaces_count = in.readUnsignedShort();
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in.skipBytes(interfaces_count * 2);
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int field_count = in.readUnsignedShort();
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for (int i = 0; i < field_count; i++) {
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in.skipBytes(6); // access_flags, name_index, descriptor_index
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skipAttributes(in);
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}
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int method_count = in.readUnsignedShort();
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for (int i = 0; i < method_count; i++) {
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in.skipBytes(6); // access_flags, name_index, descriptor_index
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skipAttributes(in);
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}
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int classAttributesPos = data.length - in.available();
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int attributes_count = in.readUnsignedShort();
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f.renameTo(new File(f.getPath() + ".BAK"));
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DataOutputStream out = new DataOutputStream(new FileOutputStream(f));
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// copy head
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out.write(data, 0, constantPoolPos);
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// copy constant pool, adding in name of new attribute
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out.writeShort(constant_pool_count + 1);
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out.write(data, constantPoolPos + 2, flagsPos - constantPoolPos - 2);
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out.write(1); // CONSTANT_Utf8
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out.writeUTF(newAttributeName);
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// copy flags, class, superclass, interfaces, fields and methods
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out.write(data, flagsPos, classAttributesPos - flagsPos);
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// copy class attributes, adding in new attribute
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out.writeShort(attributes_count + 1);
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out.write(data, classAttributesPos + 2, data.length - classAttributesPos - 2);
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out.writeShort(constant_pool_count); // index of new attribute name
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out.writeInt(newAttributeData.length);
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out.write(newAttributeData);
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out.close();
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}
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int skipConstantPool(DataInputStream in) throws IOException {
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int constant_pool_count = in.readUnsignedShort();
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for (int i = 1; i < constant_pool_count; i++) {
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int tag = in.readUnsignedByte();
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switch (tag) {
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case 1: // CONSTANT_Utf8
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int length = in.readUnsignedShort();
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in.skipBytes(length); // bytes
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break;
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case 3: // CONSTANT_Integer
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case 4: // CONSTANT_Float
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in.skipBytes(4); // bytes
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break;
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case 5: // CONSTANT_Long
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case 6: // CONSTANT_Double
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in.skipBytes(8); // high_bytes, low_bytes
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break;
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case 7: // CONSTANT_Class
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in.skipBytes(2); // name_index
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break;
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case 8: // CONSTANT_String
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in.skipBytes(2); // string_index
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break;
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case 9: // CONSTANT_FieldRef
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case 10: // CONSTANT_Methodref
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case 11: // CONSTANT_InterfaceMethodref
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in.skipBytes(4); // class_index, name_and_type_index
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break;
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case 12: // CONSTANT_NameAndType
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in.skipBytes(4); // name_index, descriptor_index
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break;
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default:
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throw new Error("constant pool tag: " + tag);
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}
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}
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return constant_pool_count;
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}
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int skipAttributes(DataInputStream in) throws IOException {
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int attributes_count = in.readUnsignedShort();
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for (int i = 0; i < attributes_count; i++) {
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in.skipBytes(2); // attribute_name_index;
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int length = in.readInt();
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in.skipBytes(length); // info
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}
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return attributes_count;
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}
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String javap(File f) {
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StringWriter sw = new StringWriter();
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PrintWriter out = new PrintWriter(sw);
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int rc = com.sun.tools.javap.Main.run(new String[] { "-v", f.getPath() }, out);
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if (rc != 0)
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throw new Error("javap failed. rc=" + rc);
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out.close();
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return sw.toString();
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}
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void verify(String output) {
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System.out.println(output);
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output = output.substring(output.indexOf("Test.java"));
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if (output.indexOf("-") >= 0)
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throw new Error("- found in output");
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if (output.indexOf("FFFFFF") >= 0)
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throw new Error("FFFFFF found in output");
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}
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}
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