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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 cuchaz.enigma.mapping.*;
import javassist.CtBehavior;
import javassist.CtClass;
import javassist.CtField;
import javassist.CtMethod;
import javassist.bytecode.ConstPool;
import javassist.bytecode.Descriptor;
import javassist.bytecode.EnclosingMethodAttribute;
import javassist.bytecode.SourceFileAttribute;
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 and type
FieldEntry entry = EntryFactory.getFieldEntry(
Descriptor.toJvmName(constants.getFieldrefClassName(i)),
constants.getFieldrefName(i),
constants.getFieldrefType(i)
);
FieldEntry translatedEntry = m_translator.translateEntry(entry);
if (!entry.equals(translatedEntry)) {
editor.changeMemberrefNameAndType(i, translatedEntry.getName(), translatedEntry.getType().toString());
}
}
break;
case ConstPool.CONST_Methodref:
case ConstPool.CONST_InterfaceMethodref: {
// translate the name and type (ie signature)
BehaviorEntry entry = EntryFactory.getBehaviorEntry(
Descriptor.toJvmName(editor.getMemberrefClassname(i)),
editor.getMemberrefName(i),
editor.getMemberrefType(i)
);
BehaviorEntry translatedEntry = m_translator.translateEntry(entry);
if (!entry.equals(translatedEntry)) {
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 = EntryFactory.getFieldEntry(field);
String translatedName = m_translator.translate(entry);
if (translatedName != null) {
field.setName(translatedName);
}
// translate the type
Type translatedType = m_translator.translateType(entry.getType());
field.getFieldInfo().setDescriptor(translatedType.toString());
}
// translate all the methods and constructors
for (CtBehavior behavior : c.getDeclaredBehaviors()) {
BehaviorEntry entry = EntryFactory.getBehaviorEntry(behavior);
if (behavior instanceof CtMethod) {
CtMethod method = (CtMethod) behavior;
// translate the name
String translatedName = m_translator.translate(entry);
if (translatedName != null) {
method.setName(translatedName);
}
}
if (entry.getSignature() != null) {
// translate the signature
Signature translatedSignature = m_translator.translateSignature(entry.getSignature());
behavior.getMethodInfo().setDescriptor(translatedSignature.toString());
}
}
// translate the EnclosingMethod attribute
EnclosingMethodAttribute enclosingMethodAttr = (EnclosingMethodAttribute) c.getClassFile().getAttribute(EnclosingMethodAttribute.tag);
if (enclosingMethodAttr != null) {
if (enclosingMethodAttr.methodIndex() == 0) {
BehaviorEntry obfBehaviorEntry = EntryFactory.getBehaviorEntry(Descriptor.toJvmName(enclosingMethodAttr.className()));
BehaviorEntry deobfBehaviorEntry = m_translator.translateEntry(obfBehaviorEntry);
c.getClassFile().addAttribute(new EnclosingMethodAttribute(
constants,
deobfBehaviorEntry.getClassName()
));
} else {
BehaviorEntry obfBehaviorEntry = EntryFactory.getBehaviorEntry(
Descriptor.toJvmName(enclosingMethodAttr.className()),
enclosingMethodAttr.methodName(),
enclosingMethodAttr.methodDescriptor()
);
BehaviorEntry deobfBehaviorEntry = m_translator.translateEntry(obfBehaviorEntry);
c.getClassFile().addAttribute(new EnclosingMethodAttribute(
constants,
deobfBehaviorEntry.getClassName(),
deobfBehaviorEntry.getName(),
deobfBehaviorEntry.getSignature().toString()
));
}
}
// translate all the class names referenced in the code
// the above code only changed method/field/reference names and types, but not the rest of the class references
ClassRenamer.renameClasses(c, m_translator);
// translate the source file attribute too
ClassEntry deobfClassEntry = m_translator.translateEntry(classEntry);
if (deobfClassEntry != null) {
String sourceFile = Descriptor.toJvmName(deobfClassEntry.getOutermostClassEntry().getSimpleName()) + ".java";
c.getClassFile().addAttribute(new SourceFileAttribute(constants, sourceFile));
}
}
}
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