1 // Check that stack trace's work, and stack trace line numbers, if available,
2 // are correct.
3 
4 public class StackTrace2
5 {
main(String[] args)6   public static void main(String[] args)
7   {
8     try
9     {
10       new StackTrace2().a();
11     }
12     catch (Exception x)
13     {
14       StackTraceElement[] trace = x.getStackTrace();
15       checkTrace(trace);
16     }
17   }
18 
a()19   void a()
20   {
21     new Inner().foo();
22   }
23 
24   class Inner
25   {
foo()26     public void foo()
27     {
28       doCrash(null);
29     }
30 
doCrash(Object o)31     public void doCrash(Object o)
32     {
33       o.toString();
34     }
35   }
36 
checkTrace(StackTraceElement[] trace)37   static void checkTrace(StackTraceElement[] trace)
38   {
39     System.out.println("Trace length = " + trace.length);
40     checkLine(trace[0], "StackTrace2$Inner", "doCrash", 33);
41     checkLine(trace[1], "StackTrace2$Inner", "foo", 28);
42     checkLine(trace[2], "StackTrace2", "a", 21);
43     checkLine(trace[3], "StackTrace2", "main", 10);
44   }
45 
checkLine(StackTraceElement frame, String expected_cl, String expected_method, int expected_line)46   static void checkLine(StackTraceElement frame, String expected_cl,
47                 	String expected_method, int expected_line)
48   {
49     if (frame.getClassName().equals(expected_cl))
50       System.out.print(expected_cl);
51     else
52       System.out.print("FAIL - expected " + expected_cl + ", got: " +
53 		       frame.getClassName());
54 
55     System.out.print(".");
56 
57     if (frame.getMethodName().equals(expected_method))
58       System.out.print(expected_method);
59     else
60       System.out.print("FAIL - expected " + expected_method + ", got: " +
61 		       frame.getMethodName());
62 
63     System.out.print(":");
64 
65     // Permit either the correct line number or no line number. This is so
66     // we don't fail on platforms that don't yet support reading debug info
67     // for stack traces, or when no debug info is available.
68     if (frame.getLineNumber() < 0
69         || (frame.getLineNumber() == expected_line
70             && frame.getFileName().equals("StackTrace2.java")))
71       System.out.println("OK");
72     else
73       System.out.println("FAIL - expected " + expected_line + ", got: "
74 			 + frame.getLineNumber() + ", in file "
75 			 + frame.getFileName());
76   }
77 }
78