1 /*

     2  * Copyright (c) 2010, 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 6999210

    27  * @summary javac should be able to warn of anomalous conditions in classfiles

    28  */

    29 

    30 import java.io.*;

    31 import java.util.*;

    32 

    33 public class T6999210 {

    34     public static void main(String... args) throws Exception {

    35         new T6999210().run();

    36     }

    37 

    38     void run() throws Exception {

    39         File srcDir = new File("src");

    40         File classesDir = new File("classes");

    41         classesDir.mkdirs();

    42 

    43         File c_java = writeFile(srcDir, "C.java", "class C<T> { }");

    44         compile("-d", classesDir.getPath(), c_java.getPath());

    45         File c_class = new File(classesDir, "C.class");

    46         setMajorVersion(c_class, 48);

    47         File d_java = writeFile(srcDir, "D.java", "class D { C c; }");

    48 

    49         // verify no warning if -Xlint:classfile not enabled

    50         String out1 = compile(

    51             "-d", classesDir.getPath(),

    52             "-classpath", classesDir.getPath(),

    53             d_java.getPath());

    54         if (out1.length() > 0)

    55             error("unexpected output from javac");

    56 

    57         // sanity check of warning when -XDrawDiagnostics not used

    58         String out2 = compile(

    59             "-d", classesDir.getPath(),

    60             "-classpath", classesDir.getPath(),

    61             "-Xlint:classfile",

    62             d_java.getPath());

    63         if (!out2.contains("[classfile]"))

    64             error("expected output \"[classfile]\" not found");

    65 

    66         // check specific details, using -XDrawDiagnostics

    67         String out3 = compile(

    68             "-d", classesDir.getPath(),

    69             "-classpath", classesDir.getPath(),

    70             "-Xlint:classfile", "-XDrawDiagnostics",

    71             d_java.getPath());

    72         String expect = "C.class:-:-: compiler.warn.future.attr: Signature, 49, 0, 48, 0";

    73         if (!out3.contains(expect))

    74             error("expected output \"" + expect + "\" not found");

    75 

    76         if (errors > 0)

    77             throw new Exception(errors + " errors occurred");

    78     }

    79 

    80     String compile(String... args) throws Exception {

    81         System.err.println("compile: " + Arrays.asList(args));

    82         StringWriter sw = new StringWriter();

    83         PrintWriter pw = new PrintWriter(sw);

    84         int rc = com.sun.tools.javac.Main.compile(args, pw);

    85         pw.close();

    86         String out = sw.toString();

    87         if (out.length() > 0)

    88             System.err.println(out);

    89         if (rc != 0)

    90             throw new Exception("compilation failed, rc=" + rc);

    91         return out;

    92     }

    93 

    94     void setMajorVersion(File f, int major) throws IOException {

    95         int len = (int) f.length();

    96         byte[] data = new byte[len];

    97         try (DataInputStream in = new DataInputStream(new FileInputStream(f))) {

    98             in.readFully(data);

    99         }

   100         // u4 magic

   101         // u2 minor

   102         data[6] = (byte) (major >> 8);

   103         data[7] = (byte) (major & 0xff);

   104         try (FileOutputStream out = new FileOutputStream(f)) {

   105             out.write(data);

   106         }

   107     }

   108 

   109     File writeFile(File dir, String path, String body) throws IOException {

   110         File f = new File(dir, path);

   111         f.getParentFile().mkdirs();

   112         try (FileWriter out = new FileWriter(f)) {

   113             out.write(body);

   114         }

   115         return f;

   116     }

   117 

   118     void error(String msg) {

   119         System.err.println("Error: " + msg);

   120         errors++;

   121     }

   122 

   123     int errors;

   124 }