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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2003 Shigeru Chiba. All Rights Reserved.
*
* This library 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 library 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.
*/
package javassist.convert;
import javassist.CtClass;
import javassist.CtField;
import javassist.bytecode.*;
import javassist.CannotCompileException;
final public class TransformWriteField extends TransformReadField {
public TransformWriteField(Transformer next, CtField field,
String methodClassname, String methodName)
{
super(next, field, methodClassname, methodName);
}
public int transform(CtClass tclazz, int pos, CodeIterator iterator,
ConstPool cp) throws BadBytecode
{
int c = iterator.byteAt(pos);
if (c == PUTFIELD || c == PUTSTATIC) {
int index = iterator.u16bitAt(pos + 1);
String typedesc = isField(tclazz.getClassPool(), cp,
fieldClass, fieldname, isPrivate, index);
if (typedesc != null) {
if (c == PUTSTATIC) {
CodeAttribute ca = iterator.get();
iterator.move(pos);
char c0 = typedesc.charAt(0);
if (c0 == 'J' || c0 == 'D') { // long or double
// insertGap() may insert 4 bytes.
iterator.insertGap(3);
iterator.writeByte(ACONST_NULL, pos);
iterator.writeByte(DUP_X2, pos + 1);
iterator.writeByte(POP, pos + 2);
ca.setMaxStack(ca.getMaxStack() + 2);
}
else {
// insertGap() may insert 4 bytes.
iterator.insertGap(2);
iterator.writeByte(ACONST_NULL, pos);
iterator.writeByte(SWAP, pos + 1);
ca.setMaxStack(ca.getMaxStack() + 1);
}
pos = iterator.next();
}
int mi = cp.addClassInfo(methodClassname);
String type = "(Ljava/lang/Object;" + typedesc + ")V";
int methodref = cp.addMethodrefInfo(mi, methodName, type);
iterator.writeByte(INVOKESTATIC, pos);
iterator.write16bit(methodref, pos + 1);
}
}
return pos;
}
}
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