1 /*
2 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @bug 6622260
27 * @summary javap prints negative bytes incorrectly in hex
28 * @modules jdk.compiler
29 */
30
31 import java.io.*;
32
33 public class T6622260 {
34 public static void main(String[] args) throws Exception {
35 new T6622260().run();
36 }
37
38 public void run() throws IOException {
39 File javaFile = writeTestFile();
40 File classFile = compileTestFile(javaFile);
41 modifyClassFile(classFile);
42 String output = javap(classFile);
43 verify(output);
44 }
45
46 File writeTestFile() throws IOException {
47 File f = new File("Test.java");
48 PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f)));
49 out.println("@Deprecated class Test { int f; void m() { } }");
50 out.close();
51 return f;
52 }
53
54 File compileTestFile(File f) {
55 int rc = com.sun.tools.javac.Main.compile(new String[] { f.getPath() });
56 if (rc != 0)
57 throw new Error("compilation failed. rc=" + rc);
58 String path = f.getPath();
59 return new File(path.substring(0, path.length() - 5) + ".class");
60 }
61
62 void modifyClassFile(File f) throws IOException {
63 String newAttributeName = "NonstandardAttribute";
64 byte[] newAttributeData = { 0, 1, 2, 127, (byte)128, (byte)129, (byte)254, (byte)255 };
65
66 DataInputStream in = new DataInputStream(new FileInputStream(f));
67 byte[] data = new byte[(int) f.length()];
68 in.readFully(data);
69 in.close();
70
71 in = new DataInputStream(new ByteArrayInputStream(data));
72 in.skipBytes(4); // magic
73 in.skipBytes(2); // minor
74 in.skipBytes(2); // minor
75
76 int constantPoolPos = data.length - in.available();
77 int constant_pool_count = skipConstantPool(in);
78
79 int flagsPos = data.length - in.available();
80 in.skipBytes(2); // access_flags
81 in.skipBytes(2); // this_class
82 in.skipBytes(2); // super_class
83
84 int interfaces_count = in.readUnsignedShort();
85 in.skipBytes(interfaces_count * 2);
86
87 int field_count = in.readUnsignedShort();
88 for (int i = 0; i < field_count; i++) {
89 in.skipBytes(6); // access_flags, name_index, descriptor_index
90 skipAttributes(in);
91 }
92
93 int method_count = in.readUnsignedShort();
94 for (int i = 0; i < method_count; i++) {
95 in.skipBytes(6); // access_flags, name_index, descriptor_index
96 skipAttributes(in);
97 }
98
99 int classAttributesPos = data.length - in.available();
100 int attributes_count = in.readUnsignedShort();
101
102 f.renameTo(new File(f.getPath() + ".BAK"));
103 DataOutputStream out = new DataOutputStream(new FileOutputStream(f));
104
105 // copy head
106 out.write(data, 0, constantPoolPos);
107
108 // copy constant pool, adding in name of new attribute
109 out.writeShort(constant_pool_count + 1);
110 out.write(data, constantPoolPos + 2, flagsPos - constantPoolPos - 2);
111 out.write(1); // CONSTANT_Utf8
112 out.writeUTF(newAttributeName);
113
114 // copy flags, class, superclass, interfaces, fields and methods
115 out.write(data, flagsPos, classAttributesPos - flagsPos);
116
117 // copy class attributes, adding in new attribute
118 out.writeShort(attributes_count + 1);
119 out.write(data, classAttributesPos + 2, data.length - classAttributesPos - 2);
120 out.writeShort(constant_pool_count); // index of new attribute name
121 out.writeInt(newAttributeData.length);
122 out.write(newAttributeData);
123 out.close();
124 }
125
126 int skipConstantPool(DataInputStream in) throws IOException {
127 int constant_pool_count = in.readUnsignedShort();
128 for (int i = 1; i < constant_pool_count; i++) {
129 int tag = in.readUnsignedByte();
130 switch (tag) {
131 case 1: // CONSTANT_Utf8
132 int length = in.readUnsignedShort();
133 in.skipBytes(length); // bytes
134 break;
135
136 case 3: // CONSTANT_Integer
137 case 4: // CONSTANT_Float
138 in.skipBytes(4); // bytes
139 break;
140
141 case 5: // CONSTANT_Long
142 case 6: // CONSTANT_Double
143 in.skipBytes(8); // high_bytes, low_bytes
144 break;
145
146 case 7: // CONSTANT_Class
147 in.skipBytes(2); // name_index
148 break;
149
150 case 8: // CONSTANT_String
151 in.skipBytes(2); // string_index
152 break;
153
154 case 9: // CONSTANT_FieldRef
155 case 10: // CONSTANT_Methodref
156 case 11: // CONSTANT_InterfaceMethodref
157 in.skipBytes(4); // class_index, name_and_type_index
158 break;
159
160 case 12: // CONSTANT_NameAndType
161 in.skipBytes(4); // name_index, descriptor_index
162 break;
163
164 default:
165 throw new Error("constant pool tag: " + tag);
166 }
167 }
168 return constant_pool_count;
169 }
170
171 int skipAttributes(DataInputStream in) throws IOException {
172 int attributes_count = in.readUnsignedShort();
173 for (int i = 0; i < attributes_count; i++) {
174 in.skipBytes(2); // attribute_name_index;
175 int length = in.readInt();
176 in.skipBytes(length); // info
177 }
178 return attributes_count;
179 }
180
181 String javap(File f) {
182 StringWriter sw = new StringWriter();
183 PrintWriter out = new PrintWriter(sw);
184 int rc = com.sun.tools.javap.Main.run(new String[] { "-v", f.getPath() }, out);
185 if (rc != 0)
186 throw new Error("javap failed. rc=" + rc);
187 out.close();
188 return sw.toString();
189 }
190
191 void verify(String output) {
192 System.out.println(output);
193 output = output.substring(output.indexOf("Test.java"));
194 if (output.indexOf("-") >= 0)
195 throw new Error("- found in output");
196 if (output.indexOf("FFFFFF") >= 0)
197 throw new Error("FFFFFF found in output");
198 }
199 }