libjava/testsuite/libjava.lang/StackTrace2.java

   1 // Check that stack trace's work, and stack trace line numbers, if available,
   2 // are correct.
   3
   4 public class StackTrace2
   5 {
   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
  19   void a()
  20   {
  21     new Inner().foo();
  22   }
  23
  24   class Inner
  25   {
  26     public void foo()
  27     {
  28       doCrash(null);
  29     }
  30
  31     public void doCrash(Object o)
  32     {
  33       o.toString();
  34     }
  35   }
  36
  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
  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 }