1 /*

     2  * Copyright (c) 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 8000316

    27  * @summary Huge performance bottleneck in com.sun.tools.javac.comp.Check.localClassName

    28  * @modules jdk.compiler

    29  * @run main T8000316

    30  */

    31 

    32 import com.sun.source.util.JavacTask;

    33 import java.net.URI;

    34 import java.util.List;

    35 import java.util.ArrayList;

    36 import java.util.Locale;

    37 import javax.tools.Diagnostic;

    38 import javax.tools.JavaCompiler;

    39 import javax.tools.JavaFileObject;

    40 import javax.tools.SimpleJavaFileObject;

    41 import javax.tools.StandardJavaFileManager;

    42 import javax.tools.ToolProvider;

    43 

    44 public class T8000316 {

    45 

    46     final static int N_METHODS = 1024;

    47     final static int N_CLASSES = 8;

    48 

    49     static class TestClass extends SimpleJavaFileObject {

    50 

    51         String methTemplate = "    public static Runnable get#N() {\n" +

    52                               "        return new Runnable() {\n" +

    53                               "            @Override\n" +

    54                               "            public void run() {\n" +

    55                               "                return;\n" +

    56                               "            }\n" +

    57                               "        };\n" +

    58                               "    }\n";

    59 

    60         String classTemplate = "\n\nclass Chain#N {\n\n#M }";

    61 

    62         String source;

    63 

    64         public TestClass() {

    65             super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);

    66             StringBuilder buf = new StringBuilder();

    67             StringBuilder fileBuf = new StringBuilder();

    68 

    69             for (int i = 0 ; i < N_CLASSES ; i++) {

    70                 for (int j = 0; j < N_METHODS; j++) {

    71                     buf.append(methTemplate.replace("#N", String.valueOf(j)));

    72                     buf.append("\n");

    73                 }

    74                 fileBuf.append(classTemplate.replace("#M", buf.toString()).replace("#N", String.valueOf(i)));

    75                 buf = new StringBuilder();

    76                 source = fileBuf.toString();

    77             }

    78         }

    79 

    80         @Override

    81         public CharSequence getCharContent(boolean ignoreEncodingErrors) {

    82             return source;

    83         }

    84     }

    85 

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

    87         ArrayList<JavaFileObject> sources = new ArrayList<>();

    88         sources.add(new TestClass());

    89         new T8000316().run(sources);

    90     }

    91 

    92     void run(List<JavaFileObject> sources) throws Exception {

    93         javax.tools.DiagnosticListener<JavaFileObject> dc = (diagnostic) -> {

    94             if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {

    95                 throw new AssertionError("unexpected diagnostic: " + diagnostic.getMessage(Locale.getDefault()));

    96             }

    97         };

    98         JavaCompiler comp = ToolProvider.getSystemJavaCompiler();

    99         try (StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null)) {

   100             JavacTask ct = (JavacTask)comp.getTask(null, fm, dc,

   101                     null, null, sources);

   102             ct.analyze();

   103         }

   104     }

   105 }