1 /*

     2  * Copyright (c) 2017, 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 8192885

    27  * @summary Compiler in JDK 10-ea+33 misses to include entry in LineNumberTable for goto instruction of foreach loop

    28  * @library /tools/lib

    29  * @modules jdk.jdeps/com.sun.tools.classfile

    30  *          jdk.compiler/com.sun.tools.javac.api

    31  *          jdk.compiler/com.sun.tools.javac.main

    32  *          jdk.compiler/com.sun.tools.javac.util

    33  *          jdk.jdeps/com.sun.tools.javap

    34  * @build toolbox.ToolBox toolbox.JavacTask

    35  * @run main AddGotoAfterForLoopToLNTTest

    36  */

    37 

    38 import java.io.File;

    39 import java.nio.file.Paths;

    40 

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

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

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

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

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

    46 

    47 import toolbox.JavacTask;

    48 import toolbox.ToolBox;

    49 

    50 public class AddGotoAfterForLoopToLNTTest {

    51 

    52     static final String testSource =

    53     /* 01 */        "class GotoAtEnhancedForTest {\n" +

    54     /* 02 */        "    void lookForThisMethod() {\n" +

    55     /* 03 */        "        for (Object o : java.util.Collections.emptyList()) {\n" +

    56     /* 04 */        "        }\n" +

    57     /* 05 */        "    }\n" +

    58     /* 06 */        "}";

    59 

    60     static final int[][] expectedLNT = {

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

    62         {3,           0},

    63         {4,           25},

    64         {3,           28},

    65         {5,           30},

    66     };

    67 

    68     static final String methodToLookFor = "lookForThisMethod";

    69 

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

    71         new AddGotoAfterForLoopToLNTTest().run();

    72     }

    73 

    74     ToolBox tb = new ToolBox();

    75 

    76     void run() throws Exception {

    77         compileTestClass();

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

    79                 "GotoAtEnhancedForTest.class").toUri()), methodToLookFor);

    80     }

    81 

    82     void compileTestClass() throws Exception {

    83         new JavacTask(tb)

    84                 .sources(testSource)

    85                 .run();

    86     }

    87 

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

    89         ClassFile classFile = ClassFile.read(cfile);

    90         boolean methodFound = false;

    91         for (Method method : classFile.methods) {

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

    93                 methodFound = true;

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

    95                 LineNumberTable_attribute lnt =

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

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

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

    99                 int i = 0;

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

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

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

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

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

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

   106                     i++;

   107                 }

   108             }

   109         }

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

   111     }

   112 

   113     void error(String msg) {

   114         throw new AssertionError(msg);

   115     }

   116 }