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- /*
- * 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.ClassPool;
- import javassist.CtClass;
- import javassist.CtField;
- import javassist.Modifier;
- import javassist.NotFoundException;
- import javassist.bytecode.BadBytecode;
- import javassist.bytecode.CodeIterator;
- import javassist.bytecode.ConstPool;
-
- public class TransformReadField extends Transformer {
- protected String fieldname;
- protected CtClass fieldClass;
- protected boolean isPrivate;
- protected String methodClassname, methodName;
-
- public TransformReadField(Transformer next, CtField field,
- String methodClassname, String methodName)
- {
- super(next);
- this.fieldClass = field.getDeclaringClass();
- this.fieldname = field.getName();
- this.methodClassname = methodClassname;
- this.methodName = methodName;
- this.isPrivate = Modifier.isPrivate(field.getModifiers());
- }
-
- static String isField(ClassPool pool, ConstPool cp, CtClass fclass,
- String fname, boolean is_private, int index) {
- if (!cp.getFieldrefName(index).equals(fname))
- return null;
-
- try {
- CtClass c = pool.get(cp.getFieldrefClassName(index));
- if (c == fclass || (!is_private && isFieldInSuper(c, fclass, fname)))
- return cp.getFieldrefType(index);
- }
- catch (NotFoundException e) {}
- return null;
- }
-
- static boolean isFieldInSuper(CtClass clazz, CtClass fclass, String fname) {
- if (!clazz.subclassOf(fclass))
- return false;
-
- try {
- CtField f = clazz.getField(fname);
- return f.getDeclaringClass() == fclass;
- }
- catch (NotFoundException e) {}
- return false;
- }
-
- @Override
- public int transform(CtClass tclazz, int pos, CodeIterator iterator,
- ConstPool cp) throws BadBytecode
- {
- int c = iterator.byteAt(pos);
- if (c == GETFIELD || c == GETSTATIC) {
- int index = iterator.u16bitAt(pos + 1);
- String typedesc = isField(tclazz.getClassPool(), cp,
- fieldClass, fieldname, isPrivate, index);
- if (typedesc != null) {
- if (c == GETSTATIC) {
- iterator.move(pos);
- pos = iterator.insertGap(1); // insertGap() may insert 4 bytes.
- iterator.writeByte(ACONST_NULL, pos);
- pos = iterator.next();
- }
-
- String type = "(Ljava/lang/Object;)" + typedesc;
- int mi = cp.addClassInfo(methodClassname);
- int methodref = cp.addMethodrefInfo(mi, methodName, type);
- iterator.writeByte(INVOKESTATIC, pos);
- iterator.write16bit(methodref, pos + 1);
- return pos;
- }
- }
-
- return pos;
- }
- }
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