/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.convert;
import javassist.
CtClass;
import javassist.
CtField;
import javassist.bytecode.
BadBytecode;
import javassist.bytecode.
CodeAttribute;
import javassist.bytecode.
CodeIterator;
import javassist.bytecode.
ConstPool;
final public class
TransformWriteField extends
TransformReadField {
public
TransformWriteField(
Transformer next,
CtField field,
String methodClassname,
String methodName)
{
super(
next,
field,
methodClassname,
methodName);
}
@
Override
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.
pos =
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.
pos =
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;
}
}