/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.weaver.retro;
import java.io.InputStream;
import java.io.PrintWriter;
import java.lang.annotation.Inherited;
import java.util.HashMap;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CodeConverter;
import javassist.CtClass;
import javassist.NotFoundException;
import javassist.bytecode.AnnotationsAttribute;
import javassist.bytecode.BadBytecode;
import javassist.bytecode.ClassFile;
import javassist.bytecode.ClassFileWriter;
import javassist.bytecode.CodeAttribute;
import javassist.bytecode.CodeIterator;
import javassist.bytecode.ConstPool;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.Opcode;
import javassist.bytecode.annotation.Annotation;
import javassist.expr.ExprEditor;
import org.jboss.weaver.ClassFileInfo;
import org.jboss.weaver.Weaver;
/**
* Weaver configuration for converting class files to jdk1.4
*
* @author pgier
*
*/
public class WeaverRetroJdk14 extends Weaver
{
private static Logger log = Logger.getLogger(WeaverRetroJdk14.class.getName());
/**
* Default resource from which to load the class renames mapping.
*/
public final String DEFAULT_CLASS_RENAMES_RESOURCE = "/org/jboss/weaver/retro/class-renames.properties";
/**
* This method should be called after the classpath
* has been set.
*/
public void init() {
initClassRenames();
// Set up default converters and editors
ClassPool pool = ClassPool.getDefault();
try {
if (this.getClasspath() != null) {
pool.appendPathList(this.getClasspath());
}
addCodeConverter(new AutoboxCodeConverter(pool));
} catch (NotFoundException nfe) {
log.severe("Unable to construct default code converter");
nfe.printStackTrace();
} catch (CannotCompileException cce) {
log.severe("Unable to construct default code converter");
cce.printStackTrace();
}
addExprEditor(new ClassRedirectEditor());
}
/**
* Initialize the classes that need to be renamed.
*/
public void initClassRenames() {
InputStream is = this.getClass().getResourceAsStream(DEFAULT_CLASS_RENAMES_RESOURCE);
this.loadClassRenames(is);
}
public boolean doWeave(ClassLoader cl, ClassFileInfo info) throws BadBytecode, CannotCompileException
{
CtClass clazz = info.getClazz();
ClassFile file = clazz.getClassFile();
log.fine("weaving: " + info.getClassName());
// Already done
if (file.getMajorVersion() <= 48)
return false;
// Set the major version
file.setMajorVersion(48);
// Rename known classes
file.renameClass(getClassRenames());
ConstPool constPool = file.getConstPool();
// Rename classes with + to have $
HashMap<String, String> mapClasses = new HashMap<String, String>();
for (String name : (Set<String>) constPool.getClassNames())
{
if (name.indexOf('+') != -1) {
mapClasses.put(name, name.replace('+', '$'));
}
}
if (mapClasses.size() != 0) {
constPool.renameClass(mapClasses);
}
// Replace LDC/LDC_W
for (MethodInfo method : (List<MethodInfo>) file.getMethods()) {
rewriteLDC(constPool, method);
}
if (clazz.isAnnotation())
{
rewriteSystemAnnotations(file);
}
// Run the converters
for (CodeConverter converter : this.getCodeConverters())
{
clazz.instrument(converter);
}
// Run the editors
for (ExprEditor editor : this.getExprEditors())
{
clazz.instrument(editor);
}
if (log.isLoggable(Level.FINEST))
{
PrintWriter out = new PrintWriter(System.out, true);
out.println("*** constant pool ***");
file.getConstPool().print(out);
out.println();
out.println("*** members ***");
ClassFileWriter.print(file, out);
}
return true;
}
/**
* This rewrites the load constant ClassInfo
* to be Class.forName()
*
* @param constPool the constant pool
* @param method the method
* @throws Exception for any error
*/
public static void rewriteLDC(ConstPool constPool, MethodInfo method) throws BadBytecode
{
CodeAttribute code = method.getCodeAttribute();
if (code == null)
return;
CodeIterator iterator = code.iterator();
while (iterator.hasNext())
{
int index = iterator.next();
int op = iterator.byteAt(index);
if (op == Opcode.LDC || op == Opcode.LDC_W)
{
int index0 = iterator.byteAt(index + 1);
int constIndex = index0;
if (op == Opcode.LDC_W)
{
int index1 = iterator.byteAt(index + 2);
constIndex = (index0 << 8) + index1;
}
if (7 == constPool.getTag(constIndex))
{
String className = constPool.getClassInfo(constIndex);
int theClassName = constPool.addStringInfo(className.replace('/', '.'));
if (op == Opcode.LDC_W)
{
int b0 = theClassName >>> 8;
int b1 = theClassName & 0x0FF;
iterator.writeByte(b0, index + 1);
iterator.writeByte(b1, index + 2);
}
else
{
iterator.writeByte(theClassName, index + 1);
}
int classClass = constPool.addClassInfo("java/lang/Class");
int descriptor = constPool.addMethodrefInfo(classClass, "forName",
"(Ljava/lang/String;)Ljava/lang/Class;");
iterator.insert(new byte[]
{(byte) Opcode.INVOKESTATIC, (byte) (descriptor >>> 8), (byte) descriptor});
}
}
}
}
private void rewriteSystemAnnotations(ClassFile file)
{
AnnotationsAttribute visible = (AnnotationsAttribute) file.getAttribute(AnnotationsAttribute.visibleTag);
if (visible != null)
{
//Only bother with the @Inherited annotation for now, as this is the main thing affecting the container tests
Annotation[] annotations = visible.getAnnotations();
boolean changed = false;
for (int i = 0; i < annotations.length; i++)
{
if (annotations[i].getTypeName().equals(Inherited.class.getName()))
{
annotations[i] = new Annotation("org/jboss/lang/annotation/Inherited", file.getConstPool());
changed = true;
}
}
if (changed)
{
visible.setAnnotations(annotations);
}
}
}
}