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Java > Open Source Codes > org > codehaus > groovy > classgen > DumpingClassLoader


1 /*
2  $Id: DumpingClassLoader.java,v 1.9 2004/07/15 11:12:58 jstrachan Exp $
3
4  Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
5
6  Redistribution and use of this software and associated documentation
7  ("Software"), with or without modification, are permitted provided
8  that the following conditions are met:
9
10  1. Redistributions of source code must retain copyright
11     statements and notices. Redistributions must also contain a
12     copy of this document.
13
14  2. Redistributions in binary form must reproduce the
15     above copyright notice, this list of conditions and the
16     following disclaimer in the documentation and/or other
17     materials provided with the distribution.
18
19  3. The name "groovy" must not be used to endorse or promote
20     products derived from this Software without prior written
21     permission of The Codehaus. For written permission,
22     please contact info@codehaus.org.
23
24  4. Products derived from this Software may not be called "groovy"
25     nor may "groovy" appear in their names without prior written
26     permission of The Codehaus. "groovy" is a registered
27     trademark of The Codehaus.
28
29  5. Due credit should be given to The Codehaus -
30     http://groovy.codehaus.org/
31
32  THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
33  ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
34  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
35  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
36  THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43  OF THE POSSIBILITY OF SUCH DAMAGE.
44
45  */

46
47 package org.codehaus.groovy.classgen;
48
49 import groovy.lang.GroovyClassLoader;
50
51 import java.io.OutputStreamWriter JavaDoc;
52 import java.io.PrintWriter JavaDoc;
53 import java.io.StringWriter JavaDoc;
54
55 import org.codehaus.groovy.ast.ClassNode;
56 import org.codehaus.groovy.ast.CompileUnit;
57 import org.codehaus.groovy.control.CompilationUnit;
58 import org.codehaus.groovy.control.CompilerConfiguration;
59 import org.objectweb.asm.ClassVisitor;
60 import org.objectweb.asm.Constants;
61 import org.objectweb.asm.util.CheckClassAdapter;
62 import org.objectweb.asm.util.ASMifierClassVisitor;
63
64 /**
65  * A class loader used for debugging the bytecode generation.
66  * This will log all bytecode being loaded
67  *
68  * @author <a HREF="mailto:james@coredevelopers.net">James Strachan</a>
69  * @version $Revision: 1.9 $
70  */

71 public class DumpingClassLoader extends GroovyClassLoader implements Constants {
72
73     protected static boolean CHECK_CLASS = false;
74     protected static boolean DUMP_CLASS = true;
75
76     public DumpingClassLoader(ClassLoader JavaDoc parentLoader) {
77         super(parentLoader);
78     }
79     
80     
81     protected class DebugCollector extends ClassCollector {
82
83         DebugCollector(GroovyClassLoader cl, CompilationUnit unit) {
84             super(cl, unit);
85         }
86         
87         public void call(ClassVisitor classWriter, ClassNode classNode) {
88             // lets test out the class verifier
89
if (DUMP_CLASS) {
90                 dumper.visitClass(classNode);
91             }
92
93             if (CHECK_CLASS) {
94                 checker.visitClass(classNode);
95             }
96             
97             super.call(classWriter, classNode);
98         }
99     }
100     
101     protected ClassCollector createCollector(CompilationUnit unit) {
102         return new DebugCollector(this, unit);
103     }
104
105     protected ASMifierClassVisitor dumpVisitor = new ASMifierClassVisitor(new PrintWriter JavaDoc(new OutputStreamWriter JavaDoc(System.out)));
106     protected ASMifierClassVisitor invisibleDumpVisitor = new ASMifierClassVisitor(new PrintWriter JavaDoc(new StringWriter JavaDoc()));
107     protected CompileUnit unit = new CompileUnit(this, new CompilerConfiguration());
108     protected ClassGenerator checker =
109         new AsmClassGenerator2(new GeneratorContext(unit), new CheckClassAdapter(invisibleDumpVisitor), this, null);
110     protected ClassGenerator dumper = new AsmClassGenerator2(new GeneratorContext(unit), dumpVisitor, this, null);
111
112 }
113
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