1 /*

     2  * Copyright (c) 2013, 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.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 /*

    27  * @test

    28  * @bug 8019486

    29  * @summary javac, generates erroneous LVT for a test case with lambda code

    30  * @library /tools/javac/lib

    31  * @build ToolBox

    32  * @run main WrongLVTForLambdaTest

    33  */

    34 

    35 import java.io.File;

    36 import java.nio.file.Paths;

    37 

    38 import com.sun.tools.classfile.ClassFile;

    39 import com.sun.tools.classfile.Code_attribute;

    40 import com.sun.tools.classfile.LineNumberTable_attribute;

    41 import com.sun.tools.classfile.Method;

    42 import com.sun.tools.javac.util.Assert;

    43 

    44 public class WrongLVTForLambdaTest {

    45 

    46     static final String testSource =

    47     /* 01 */        "import java.util.List;\n" +

    48     /* 02 */        "import java.util.Arrays;\n" +

    49     /* 03 */        "import java.util.stream.Collectors;\n" +

    50     /* 04 */        "\n" +

    51     /* 05 */        "public class Foo {\n" +

    52     /* 06 */        "    void bar(int value) {\n" +

    53     /* 07 */        "        final List<Integer> numbers = Arrays.asList(1, 2, 3);\n" +

    54     /* 08 */        "        final List<Integer> numbersPlusOne = \n" +

    55     /* 09 */        "             numbers.stream().map(number -> number / 1).collect(Collectors.toList());\n" +

    56     /* 10 */        "    }\n" +

    57     /* 11 */        "}";

    58 

    59     static final int[][] expectedLNT = {

    60     //  {line-number, start-pc},

    61         {9,           0},       //number -> number / 1

    62     };

    63 

    64     static final String methodToLookFor = "lambda$0";

    65 

    66     public static void main(String[] args) throws Exception {

    67         new WrongLVTForLambdaTest().run();

    68     }

    69 

    70     void run() throws Exception {

    71         compileTestClass();

    72         checkClassFile(new File(Paths.get(System.getProperty("user.dir"),

    73                 "Foo.class").toUri()), methodToLookFor);

    74     }

    75 

    76     void compileTestClass() throws Exception {

    77         ToolBox.JavaToolArgs javacSuccessArgs =

    78                 new ToolBox.JavaToolArgs().setSources(testSource);

    79         ToolBox.javac(javacSuccessArgs);

    80     }

    81 

    82     void checkClassFile(final File cfile, String methodToFind) throws Exception {

    83         ClassFile classFile = ClassFile.read(cfile);

    84         boolean methodFound = false;

    85         for (Method method : classFile.methods) {

    86             if (method.getName(classFile.constant_pool).equals(methodToFind)) {

    87                 methodFound = true;

    88                 Code_attribute code = (Code_attribute) method.attributes.get("Code");

    89                 LineNumberTable_attribute lnt =

    90                         (LineNumberTable_attribute) code.attributes.get("LineNumberTable");

    91                 Assert.check(lnt.line_number_table_length == expectedLNT.length,

    92                         "The LineNumberTable found has a length different to the expected one");

    93                 int i = 0;

    94                 for (LineNumberTable_attribute.Entry entry: lnt.line_number_table) {

    95                     Assert.check(entry.line_number == expectedLNT[i][0] &&

    96                             entry.start_pc == expectedLNT[i][1],

    97                             "LNT entry at pos " + i + " differ from expected." +

    98                             "Found " + entry.line_number + ":" + entry.start_pc +

    99                             ". Expected " + expectedLNT[i][0] + ":" + expectedLNT[i][1]);

   100                     i++;

   101                 }

   102             }

   103         }

   104         Assert.check(methodFound, "The seek method was not found");

   105     }

   106 

   107     void error(String msg) {

   108         throw new AssertionError(msg);

   109     }

   110 

   111 }