133 lines
4.8 KiB
Java
133 lines
4.8 KiB
Java
/*
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* Copyright (c) 2014, 2019, 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 8234687
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* @summary change javap reporting on unknown attributes
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* @modules jdk.jdeps/com.sun.tools.javap
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* @run main BadAttributeName
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*/
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import java.io.*;
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import java.nio.file.*;
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public class BadAttributeName {
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public static String source = "public class Test {\n" +
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" public static void main(String[] args) {}\n" +
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"}";
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public static void main(String[] args) throws Exception {
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final File srcFile = new File("Test.java");
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Files.writeString(Path.of("Test.java"), source);
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final String[] javacOpts = {"Test.java"};
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if (com.sun.tools.javac.Main.compile(javacOpts) != 0) {
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throw new Exception("Can't compile embedded test.");
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}
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RandomAccessFile raf = new RandomAccessFile("Test.class", "rw");
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String sourceFile = "SourceFile";
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long namePos = getConstantPoolUTF8Pos(raf, sourceFile);
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if (namePos < 0) {
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throw new Exception("The class file contains no SourceFile attribute.");
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}
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raf.seek(namePos); // Jump to the SourceFile name
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// Create a "custom" attribute by reusing/renaming an unimportant existing one
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String customAttr = "CustomAttribute".substring(0, sourceFile.length());
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raf.writeUTF(customAttr);
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raf.close();
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String[] opts = { "-v", "Test.class" };
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StringWriter sw = new StringWriter();
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PrintWriter pout = new PrintWriter(sw);
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com.sun.tools.javap.Main.run(opts, pout);
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pout.flush();
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String expect = customAttr + ": length = 0x2 (unknown attribute)";
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if (sw.toString().indexOf(expect) == -1) {
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sw.toString().lines().forEach(System.out::println);
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throw new Exception("expected text not found: " + expect);
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}
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}
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private static long getConstantPoolUTF8Pos(RandomAccessFile cfile, String name) throws Exception {
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cfile.seek(0);
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int v1, v2;
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v1 = cfile.readInt();
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// System.out.println("Magic: " + String.format("%X", v1));
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v1 = cfile.readUnsignedShort();
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v2 = cfile.readUnsignedShort();
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// System.out.println("Version: " + String.format("%d.%d", v1, v2));
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v1 = cfile.readUnsignedShort();
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// System.out.println("CPool size: " + v1);
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// Exhaust the constant pool
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for (; v1 > 1; v1--) {
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// System.out.print(".");
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byte tag = cfile.readByte();
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switch (tag) {
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case 7 : // Class
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case 8 : // String
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// Data is 2 bytes long
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cfile.skipBytes(2);
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break;
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case 3 : // Integer
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case 4 : // Float
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case 9 : // FieldRef
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case 10 : // MethodRef
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case 11 : // InterfaceMethodRef
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case 12 : // Name and Type
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// Data is 4 bytes long
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cfile.skipBytes(4);
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break;
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case 5 : // Long
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case 6 : // Double
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// Data is 8 bytes long
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cfile.skipBytes(8);
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break;
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case 1 : // Utf8
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long fp = cfile.getFilePointer();
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String s = cfile.readUTF();
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if (s.equals(name)) {
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return fp;
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}
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break;
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default :
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throw new Exception("Unexpected tag in CPool: [" + tag + "] at "
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+ Long.toHexString(cfile.getFilePointer()));
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}
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}
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// System.out.println();
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// Bummer! Name not found!
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return -1L;
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}
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}
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