    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;
    52  import java.io.PrintWriter;
    53  import java.io.StringWriter;
    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 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(new OutputStreamWriter(System.out)));
    106     protected ASMifierClassVisitor invisibleDumpVisitor = new ASMifierClassVisitor(new PrintWriter(new StringWriter()));
    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 }