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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.jdeps/com.sun.tools.javap
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 {
main(String... args)39     public static void main(String... args) throws Exception {
40         new DescriptorTest().run();
41     }
42 
run()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 
writeFile(File f, String body)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 
javac(String... args)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 
javap(String... args)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 
checkContains(String s, Pattern p)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 }
93