1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   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  *
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  23 
  24 /**
  25  * @test
  26  * @bug     8007052
  27  * @summary javap should include the descriptor for a method in verbose mode
  28  * @modules jdk.compiler
  29  */
  30 
  31 import java.io.File;
  32 import java.io.FileWriter;
  33 import java.io.IOException;
  34 import java.io.PrintWriter;
  35 import java.io.StringWriter;
  36 import java.util.regex.Pattern;
  37 
  38 public class DescriptorTest {
  39     public static void main(String... args) throws Exception {
  40         new DescriptorTest().run();
  41     }
  42 
  43     void run() throws Exception {
  44         File srcDir = new File("src");
  45         srcDir.mkdirs();
  46         File classesDir = new File("classes");
  47         classesDir.mkdirs();
  48 
  49         File f = writeFile(new File(srcDir, "E.java"), "enum E { A, B }");
  50         javac("-d", classesDir.getPath(), f.getPath());
  51         String out = javap("-p", "-v", new File(classesDir, "E.class").getPath());
  52         Pattern expect = Pattern.compile("\\Qprivate E();\\E\\s+\\Qdescriptor: (Ljava/lang/String;I)V\\E");
  53         checkContains(out, expect);
  54     }
  55 
  56     File writeFile(File f, String body) throws IOException {
  57         try (FileWriter out = new FileWriter(f)) {
  58             out.write(body);
  59         }
  60         return f;
  61     }
  62 
  63     void javac(String... args) throws Exception {
  64         StringWriter sw = new StringWriter();
  65         PrintWriter pw = new PrintWriter(sw);
  66         int rc = com.sun.tools.javac.Main.compile(args, pw);
  67         pw.flush();
  68         String out = sw.toString();
  69         if (!out.isEmpty())
  70             System.err.println(out);
  71         if (rc != 0)
  72             throw new Exception("compilation failed");
  73     }
  74 
  75     String javap(String... args) throws Exception {
  76         StringWriter sw = new StringWriter();
  77         PrintWriter pw = new PrintWriter(sw);
  78         int rc = com.sun.tools.javap.Main.run(args, pw);
  79         pw.flush();
  80         String out = sw.toString();
  81         if (!out.isEmpty())
  82             System.err.println(out);
  83         if (rc != 0)
  84             throw new Exception("javap failed");
  85         return out;
  86     }
  87 
  88     void checkContains(String s, Pattern p) throws Exception {
  89         if (!p.matcher(s).find())
  90             throw new Exception("expected pattern not found: " + p);
  91     }
  92 }