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/*******************************************************************************
* Copyright (c) 2015 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Lesser General Public
* License v3.0 which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/lgpl.html
* <p>
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.bytecode;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import cuchaz.enigma.bytecode.accessors.ClassInfoAccessor;
import cuchaz.enigma.bytecode.accessors.ConstInfoAccessor;
import cuchaz.enigma.bytecode.accessors.MemberRefInfoAccessor;
import javassist.bytecode.ConstPool;
import javassist.bytecode.Descriptor;
public class ConstPoolEditor {
private static Method getItem;
private static Method addItem;
private static Method addItem0;
private static Field items;
private static Field cache;
private static Field numItems;
private static Field objects;
private static Field elements;
private static Method methodWritePool;
private static Constructor<ConstPool> constructorPool;
static {
try {
getItem = ConstPool.class.getDeclaredMethod("getItem", int.class);
getItem.setAccessible(true);
addItem = ConstPool.class.getDeclaredMethod("addItem", Class.forName("javassist.bytecode.ConstInfo"));
addItem.setAccessible(true);
addItem0 = ConstPool.class.getDeclaredMethod("addItem0", Class.forName("javassist.bytecode.ConstInfo"));
addItem0.setAccessible(true);
items = ConstPool.class.getDeclaredField("items");
items.setAccessible(true);
cache = ConstPool.class.getDeclaredField("itemsCache");
cache.setAccessible(true);
numItems = ConstPool.class.getDeclaredField("numOfItems");
numItems.setAccessible(true);
objects = Class.forName("javassist.bytecode.LongVector").getDeclaredField("objects");
objects.setAccessible(true);
elements = Class.forName("javassist.bytecode.LongVector").getDeclaredField("elements");
elements.setAccessible(true);
methodWritePool = ConstPool.class.getDeclaredMethod("write", DataOutputStream.class);
methodWritePool.setAccessible(true);
constructorPool = ConstPool.class.getDeclaredConstructor(DataInputStream.class);
constructorPool.setAccessible(true);
} catch (Exception ex) {
throw new Error(ex);
}
}
private ConstPool pool;
public ConstPoolEditor(ConstPool pool) {
this.pool = pool;
}
public String getMemberrefClassname(int memberrefIndex) {
return Descriptor.toJvmName(this.pool.getClassInfo(this.pool.getMemberClass(memberrefIndex)));
}
public String getMemberrefName(int memberrefIndex) {
return this.pool.getUtf8Info(this.pool.getNameAndTypeName(this.pool.getMemberNameAndType(memberrefIndex)));
}
public String getMemberrefType(int memberrefIndex) {
return this.pool.getUtf8Info(this.pool.getNameAndTypeDescriptor(this.pool.getMemberNameAndType(memberrefIndex)));
}
public ConstInfoAccessor getItem(int index) {
try {
Object entry = getItem.invoke(this.pool, index);
if (entry == null) {
return null;
}
return new ConstInfoAccessor(entry);
} catch (Exception ex) {
throw new Error(ex);
}
}
@SuppressWarnings("rawtypes")
public void removeLastItem() {
try {
// remove the item from the cache
HashMap cache = getCache();
if (cache != null) {
Object item = getItem(this.pool.getSize() - 1);
cache.remove(item);
}
// remove the actual item
// based off of LongVector.addElement()
Object item = items.get(this.pool);
Object[][] object = (Object[][]) objects.get(items);
int numElements = (Integer) elements.get(items) - 1;
int nth = numElements >> 7;
int offset = numElements & (128 - 1);
object[nth][offset] = null;
// decrement the number of items
elements.set(item, numElements);
numItems.set(this.pool, (Integer) numItems.get(this.pool) - 1);
} catch (Exception ex) {
throw new Error(ex);
}
}
@SuppressWarnings("rawtypes")
public HashMap getCache() {
try {
return (HashMap) cache.get(this.pool);
} catch (Exception ex) {
throw new Error(ex);
}
}
@SuppressWarnings({"rawtypes", "unchecked"})
public void changeMemberrefNameAndType(int memberrefIndex, String newName, String newType) {
// NOTE: when changing values, we always need to copy-on-write
try {
// get the memberref item
Object item = getItem(memberrefIndex).getItem();
// update the cache
HashMap cache = getCache();
if (cache != null) {
cache.remove(item);
}
new MemberRefInfoAccessor(item).setNameAndTypeIndex(this.pool.addNameAndTypeInfo(newName, newType));
// update the cache
if (cache != null) {
cache.put(item, item);
}
} catch (Exception ex) {
throw new Error(ex);
}
// make sure the change worked
assert (newName.equals(getMemberrefName(memberrefIndex)));
assert (newType.equals(getMemberrefType(memberrefIndex)));
}
}
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