1 /*
2  * Debug.java
3  *
4  * Copyright (C) 2002-2003 Peter Graves
5  * $Id$
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20  *
21  * As a special exception, the copyright holders of this library give you
22  * permission to link this library with independent modules to produce an
23  * executable, regardless of the license terms of these independent
24  * modules, and to copy and distribute the resulting executable under
25  * terms of your choice, provided that you also meet, for each linked
26  * independent module, the terms and conditions of the license of that
27  * module.  An independent module is a module which is not derived from
28  * or based on this library.  If you modify this library, you may extend
29  * this exception to your version of the library, but you are not
30  * obligated to do so.  If you do not wish to do so, delete this
31  * exception statement from your version.
32  */
33 
34 package org.armedbear.lisp;
35 
36 import static org.armedbear.lisp.Lisp.*;
37 import java.io.PrintWriter;
38 import java.io.StringWriter;
39 
40 public final class Debug
41 {
42 
assertTrue(boolean b)43     public static final void assertTrue(boolean b)
44     {
45         if (!b) {
46             String msg = "ABCL Debug.assertTrue() assertion failed!";
47             System.err.println(msg);
48             Error e = new Error(msg);
49             e.printStackTrace(System.err);
50 
51 	    StringBuffer buffer = new StringBuffer();
52 	    final String CR = "\n";
53 	    buffer.append(msg).append(CR);
54 	    StackTraceElement[] stack = e.getStackTrace();
55 	    for (int i = 0; i < stack.length; i++) {
56 		buffer.append(stack[i].toString()).append(CR);
57 	    }
58             throw new Error(buffer.toString());
59         }
60     }
61 
62     // Does not throw an exception.
bug()63     public static void bug()
64     {
65         trace(new Exception("BUG!"));
66     }
67 
trace(String s)68     public static final void trace(String s)
69     {
70         System.err.println(s);
71     }
72 
73     @SuppressWarnings("CallToThreadDumpStack")
trace(Throwable t)74     public static final void trace(Throwable t)
75     {
76         t.printStackTrace();
77     }
78 
trace(String message, Throwable t)79     public static final void trace(String message, Throwable t)
80     {
81        trace(message);
82        trace(t);
83     }
84     public static final Symbol _DEBUG_WARN_
85         = exportSpecial("*DEBUG-WARN*", PACKAGE_SYS, NIL);
86 
setDebugWarnings(boolean flag)87     public static void setDebugWarnings(boolean flag) {
88         if (flag) {
89             _DEBUG_WARN_.setSymbolValue(T);
90         } else {
91             _DEBUG_WARN_.setSymbolValue(NIL);
92         }
93     }
94 
warn(String s)95     public static final void warn(String s) {
96         if (_DEBUG_WARN_.getSymbolValue() != null) {
97             trace(s);
98         }
99     }
100 }
101