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/*******************************************************************************
* Copyright (c) 2014 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Public License v3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/gpl.html
*
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.bytecode;
import java.util.Map;
import javassist.CtBehavior;
import javassist.CtClass;
import javassist.CtField;
import javassist.CtMethod;
import javassist.bytecode.ConstPool;
import javassist.bytecode.Descriptor;
import javassist.bytecode.SourceFileAttribute;
import com.google.common.collect.Maps;
import cuchaz.enigma.mapping.BehaviorEntry;
import cuchaz.enigma.mapping.BehaviorEntryFactory;
import cuchaz.enigma.mapping.ClassEntry;
import cuchaz.enigma.mapping.FieldEntry;
import cuchaz.enigma.mapping.JavassistUtil;
import cuchaz.enigma.mapping.MethodEntry;
import cuchaz.enigma.mapping.Signature;
import cuchaz.enigma.mapping.Translator;
import cuchaz.enigma.mapping.Type;
public class ClassTranslator {
private Translator m_translator;
public ClassTranslator(Translator translator) {
m_translator = translator;
}
public void translate(CtClass c) {
// NOTE: the order of these translations is very important
// translate all the field and method references in the code by editing the constant pool
ConstPool constants = c.getClassFile().getConstPool();
ConstPoolEditor editor = new ConstPoolEditor(constants);
for (int i = 1; i < constants.getSize(); i++) {
switch (constants.getTag(i)) {
case ConstPool.CONST_Fieldref: {
// translate the name
FieldEntry entry = new FieldEntry(
new ClassEntry(Descriptor.toJvmName(constants.getFieldrefClassName(i))),
constants.getFieldrefName(i),
new Type(constants.getFieldrefType(i))
);
FieldEntry translatedEntry = m_translator.translateEntry(entry);
// translate the type
Type type = new Type(constants.getFieldrefType(i));
Type translatedType = m_translator.translateType(type);
if (!entry.equals(translatedEntry) || !type.equals(translatedType)) {
editor.changeMemberrefNameAndType(i, translatedEntry.getName(), translatedType.toString());
}
}
break;
case ConstPool.CONST_Methodref:
case ConstPool.CONST_InterfaceMethodref: {
// translate the name and type
BehaviorEntry entry = BehaviorEntryFactory.create(
Descriptor.toJvmName(editor.getMemberrefClassname(i)),
editor.getMemberrefName(i),
editor.getMemberrefType(i)
);
BehaviorEntry translatedEntry = m_translator.translateEntry(entry);
if (!entry.getName().equals(translatedEntry.getName()) || !entry.getSignature().equals(translatedEntry.getSignature())) {
editor.changeMemberrefNameAndType(i, translatedEntry.getName(), translatedEntry.getSignature().toString());
}
}
break;
}
}
ClassEntry classEntry = new ClassEntry(Descriptor.toJvmName(c.getName()));
// translate all the fields
for (CtField field : c.getDeclaredFields()) {
// translate the name
FieldEntry entry = JavassistUtil.getFieldEntry(field);
String translatedName = m_translator.translate(entry);
if (translatedName != null) {
field.setName(translatedName);
}
// translate the type
Type translatedType = m_translator.translateType(new Type(field.getFieldInfo().getDescriptor()));
field.getFieldInfo().setDescriptor(translatedType.toString());
}
// translate all the methods and constructors
for (CtBehavior behavior : c.getDeclaredBehaviors()) {
if (behavior instanceof CtMethod) {
CtMethod method = (CtMethod)behavior;
// translate the name
MethodEntry entry = JavassistUtil.getMethodEntry(method);
String translatedName = m_translator.translate(entry);
if (translatedName != null) {
method.setName(translatedName);
}
}
// translate the type
Signature translatedSignature = m_translator.translateSignature(new Signature(behavior.getMethodInfo().getDescriptor()));
behavior.getMethodInfo().setDescriptor(translatedSignature.toString());
}
// translate all the class names referenced in the code
// the above code only changed method/field/reference names and types, but not the class names themselves
Map<ClassEntry,ClassEntry> map = Maps.newHashMap();
for (ClassEntry obfClassEntry : ClassRenamer.getAllClassEntries(c)) {
ClassEntry deobfClassEntry = m_translator.translateEntry(obfClassEntry);
if (!obfClassEntry.equals(deobfClassEntry)) {
map.put(obfClassEntry, deobfClassEntry);
}
}
ClassRenamer.renameClasses(c, map);
// translate the source file attribute too
ClassEntry deobfClassEntry = map.get(classEntry);
if (deobfClassEntry != null) {
String sourceFile = Descriptor.toJvmName(deobfClassEntry.getOuterClassName()) + ".java";
c.getClassFile().addAttribute(new SourceFileAttribute(constants, sourceFile));
}
}
}
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