1 /*
   2  * Copyright (c) 2013, 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 6970173
  27  * @summary Debug pointer at bad position
  28  * @library /tools/lib
  29  * @modules jdk.compiler/com.sun.tools.classfile
  30  *          jdk.compiler/com.sun.tools.javac.api
  31  *          jdk.compiler/com.sun.tools.javac.file
  32  *          jdk.compiler/com.sun.tools.javac.main
  33  *          jdk.compiler/com.sun.tools.javac.util
  34  * @build ToolBox
  35  * @run main DebugPointerAtBadPositionTest
  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 public class DebugPointerAtBadPositionTest {
  48 
  49     static final String testSource =
  50             "public class AssertionTest {\n" +
  51             "    void lookForThisMethod() {\n" +
  52             "        int i;\n" +
  53             "        i = 33;\n" +
  54             "        assert // line 5\n" +
  55             "            i < 89:\n" +
  56             "        i < 100; // line 7\n" +
  57             "    }\n" +
  58             "}";
  59 
  60     static final int[][] expectedLNT = {
  61         {4, 0},
  62         {5, 3},
  63         {8, 34}
  64     };
  65 
  66     static final String methodToLookFor = "lookForThisMethod";
  67     static final String seekMethodNotFoundMsg =
  68         "The seek method was not found";
  69     static final String foundLNTLengthDifferentThanExpMsg =
  70         "The LineNumberTable found has a length different to the expected one";
  71 
  72     public static void main(String[] args) throws Exception {
  73         new DebugPointerAtBadPositionTest().run();
  74     }
  75 
  76     void run() throws Exception {
  77         compileTestClass();
  78         checkClassFile(new File(Paths.get(System.getProperty("user.dir"),
  79                 "AssertionTest.class").toUri()), methodToLookFor);
  80     }
  81 
  82     void compileTestClass() throws Exception {
  83         ToolBox tb = new ToolBox();
  84         tb.new JavacTask()
  85                 .sources(testSource)
  86                 .run();
  87     }
  88 
  89     void checkClassFile(final File cfile, String methodToFind) throws Exception {
  90         ClassFile classFile = ClassFile.read(cfile);
  91         boolean methodFound = false;
  92         for (Method method : classFile.methods) {
  93             if (method.getName(classFile.constant_pool).equals(methodToFind)) {
  94                 methodFound = true;
  95                 Code_attribute code = (Code_attribute) method.attributes.get("Code");
  96                 LineNumberTable_attribute lnt =
  97                         (LineNumberTable_attribute) code.attributes.get("LineNumberTable");
  98                 Assert.check(lnt.line_number_table_length == expectedLNT.length,
  99                         foundLNTLengthDifferentThanExpMsg);
 100                 int i = 0;
 101                 for (LineNumberTable_attribute.Entry entry: lnt.line_number_table) {
 102                     Assert.check(entry.line_number == expectedLNT[i][0] &&
 103                             entry.start_pc == expectedLNT[i][1],
 104                             "LNT entry at pos " + i + " differ from expected." +
 105                             "Found " + entry.line_number + ":" + entry.start_pc +
 106                             ". Expected " + expectedLNT[i][0] + ":" + expectedLNT[i][1]);
 107                     i++;
 108                 }
 109             }
 110         }
 111         Assert.check(methodFound, seekMethodNotFoundMsg);
 112     }
 113 
 114     void error(String msg) {
 115         throw new AssertionError(msg);
 116     }
 117 
 118 }