1 /*
   2  * Copyright (c) 2002, 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 8000518
  27  * @summary Javac generates duplicate name_and_type constant pool entry for
  28  * class BinaryOpValueExp.java
  29  * @modules jdk.jdeps/com.sun.tools.classfile
  30  * @run main DuplicateConstantPoolEntry
  31  */
  32 
  33 import com.sun.source.util.JavacTask;
  34 import com.sun.tools.classfile.ClassFile;
  35 import com.sun.tools.classfile.ConstantPoolException;
  36 import java.io.File;
  37 import java.io.IOException;
  38 import java.net.URI;
  39 import java.util.Arrays;
  40 import java.util.List;
  41 import javax.tools.JavaCompiler;
  42 import javax.tools.JavaFileObject;
  43 import javax.tools.SimpleJavaFileObject;
  44 import javax.tools.ToolProvider;
  45 
  46 /*
  47  * This bug was reproduced having two classes B and C referenced from a class A
  48  * class C should be compiled and generated in advance. Later class A and B should
  49  * be compiled like this: javac A.java B.java
  50  */
  51 
  52 public class DuplicateConstantPoolEntry {
  53 
  54     public static void main(String args[]) throws Exception {
  55         new DuplicateConstantPoolEntry().run();
  56     }
  57 
  58     void run() throws Exception {
  59         generateFilesNeeded();
  60         checkReference();
  61     }
  62 
  63     void generateFilesNeeded() throws Exception {
  64 
  65         StringJavaFileObject[] CSource = new StringJavaFileObject[] {
  66             new StringJavaFileObject("C.java",
  67                 "class C {C(String s) {}}"),
  68         };
  69 
  70         List<StringJavaFileObject> AandBSource = Arrays.asList(
  71                 new StringJavaFileObject("A.java",
  72                     "class A {void test() {new B(null);new C(null);}}"),
  73                 new StringJavaFileObject("B.java",
  74                     "class B {B(String s) {}}")
  75         );
  76 
  77         final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
  78         JavacTask compileC = (JavacTask)tool.getTask(null, null, null, null, null,
  79                 Arrays.asList(CSource));
  80         if (!compileC.call()) {
  81             throw new AssertionError("Compilation error while compiling C.java sources");
  82         }
  83         JavacTask compileAB = (JavacTask)tool.getTask(null, null, null,
  84                 Arrays.asList("-cp", "."), null, AandBSource);
  85         if (!compileAB.call()) {
  86             throw new AssertionError("Compilation error while compiling A and B sources");
  87         }
  88     }
  89 
  90     void checkReference() throws IOException, ConstantPoolException {
  91         File file = new File("A.class");
  92         ClassFile classFile = ClassFile.read(file);
  93         for (int i = 1;
  94                 i < classFile.constant_pool.size() - 1;
  95                 i += classFile.constant_pool.get(i).size()) {
  96             for (int j = i + classFile.constant_pool.get(i).size();
  97                     j < classFile.constant_pool.size();
  98                     j += classFile.constant_pool.get(j).size()) {
  99                 if (classFile.constant_pool.get(i).toString().
 100                         equals(classFile.constant_pool.get(j).toString())) {
 101                     throw new AssertionError(
 102                             "Duplicate entries in the constant pool at positions " +
 103                             i + " and " + j);
 104                 }
 105             }
 106         }
 107     }
 108 
 109     private static class StringJavaFileObject extends SimpleJavaFileObject {
 110         StringJavaFileObject(String name, String text) {
 111             super(URI.create(name), JavaFileObject.Kind.SOURCE);
 112             this.text = text;
 113         }
 114         @Override
 115         public CharSequence getCharContent(boolean b) {
 116             return text;
 117         }
 118         private String text;
 119     }
 120 }