82 files changed, 2372 insertions, 4649 deletions

diff --git a/src/main/java/cuchaz/enigma/CommandMain.java b/src/main/java/cuchaz/enigma/CommandMain.java
index f546eb1..59eb1b6 100644
--- a/src/main/java/cuchaz/enigma/CommandMain.java
+++ b/src/main/java/cuchaz/enigma/CommandMain.java
@@ -99,7 +99,7 @@ public class CommandMain {
         private static void convertMappings(String[] args) throws Exception {
                 File fileMappings = getReadableFile(getArg(args, 1, "enigma mapping", true));
                 File result = getWritableFile(getArg(args, 2, "enigma mapping", true));
-                String name = getArg(args, 3, "format type", true);
+                String name = getArg(args, 3, "format desc", true);
                 Mappings.FormatType formatType;
                 try {
                         formatType = Mappings.FormatType.valueOf(name.toUpperCase());
diff --git a/src/main/java/cuchaz/enigma/Deobfuscator.java b/src/main/java/cuchaz/enigma/Deobfuscator.java
index 1e99af2..e1454c7 100644
--- a/src/main/java/cuchaz/enigma/Deobfuscator.java
+++ b/src/main/java/cuchaz/enigma/Deobfuscator.java
@@ -31,50 +31,55 @@ import cuchaz.enigma.bytecode.ClassPublifier;
 import cuchaz.enigma.mapping.*;
 import cuchaz.enigma.throwables.IllegalNameException;
 import cuchaz.enigma.utils.Utils;
-import javassist.CtClass;
-import javassist.bytecode.Descriptor;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.ClassNode;
 
 import java.io.*;
 import java.util.*;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
 import java.util.jar.JarOutputStream;
 
 public class Deobfuscator {
 
+        private final ReferencedEntryPool entryPool = new ReferencedEntryPool();
         private final JarFile jar;
+        private final ParsedJar parsedJar;
         private final DecompilerSettings settings;
         private final JarIndex jarIndex;
         private final MappingsRenamer renamer;
         private final Map<TranslationDirection, Translator> translatorCache;
         private Mappings mappings;
 
-        public Deobfuscator(JarFile jar) {
+        public Deobfuscator(JarFile jar) throws IOException {
                 this.jar = jar;
+                this.parsedJar = new ParsedJar(jar);
 
                 // build the jar index
-                this.jarIndex = new JarIndex();
-                this.jarIndex.indexJar(this.jar, true);
+                this.jarIndex = new JarIndex(entryPool);
+                this.jarIndex.indexJar(this.parsedJar, true);
 
                 // config the decompiler
                 this.settings = DecompilerSettings.javaDefaults();
                 this.settings.setMergeVariables(Utils.getSystemPropertyAsBoolean("enigma.mergeVariables", true));
                 this.settings.setForceExplicitImports(Utils.getSystemPropertyAsBoolean("enigma.forceExplicitImports", true));
                 this.settings.setForceExplicitTypeArguments(
-                        Utils.getSystemPropertyAsBoolean("enigma.forceExplicitTypeArguments", true));
+                                Utils.getSystemPropertyAsBoolean("enigma.forceExplicitTypeArguments", true));
                 // DEBUG
                 this.settings.setShowDebugLineNumbers(Utils.getSystemPropertyAsBoolean("enigma.showDebugLineNumbers", false));
                 this.settings.setShowSyntheticMembers(Utils.getSystemPropertyAsBoolean("enigma.showSyntheticMembers", false));
 
                 // init defaults
                 this.translatorCache = Maps.newTreeMap();
-                this.renamer = new MappingsRenamer(this.jarIndex, null);
+                this.renamer = new MappingsRenamer(this.jarIndex, null, this.entryPool);
                 // init mappings
                 setMappings(new Mappings());
         }
 
-        public JarFile getJar() {
-                return this.jar;
+        public ParsedJar getJar() {
+                return this.parsedJar;
         }
 
         public String getJarName() {
@@ -102,16 +107,16 @@ public class Deobfuscator {
                 MappingsChecker checker = new MappingsChecker(this.jarIndex);
                 checker.dropBrokenMappings(val);
                 if (warnAboutDrops) {
-                        for (java.util.Map.Entry<ClassEntry, ClassMapping> mapping : checker.getDroppedClassMappings().entrySet()) {
+                        for (Map.Entry<ClassEntry, ClassMapping> mapping : checker.getDroppedClassMappings().entrySet()) {
                                 System.out.println("WARNING: Couldn't find class entry " + mapping.getKey() + " (" + mapping.getValue().getDeobfName() + ") in jar. Mapping was dropped.");
                         }
-                        for (java.util.Map.Entry<ClassEntry, ClassMapping> mapping : checker.getDroppedInnerClassMappings().entrySet()) {
+                        for (Map.Entry<ClassEntry, ClassMapping> mapping : checker.getDroppedInnerClassMappings().entrySet()) {
                                 System.out.println("WARNING: Couldn't find inner class entry " + mapping.getKey() + " (" + mapping.getValue().getDeobfName() + ") in jar. Mapping was dropped.");
                         }
-                        for (java.util.Map.Entry<FieldEntry, FieldMapping> mapping : checker.getDroppedFieldMappings().entrySet()) {
+                        for (Map.Entry<FieldEntry, FieldMapping> mapping : checker.getDroppedFieldMappings().entrySet()) {
                                 System.out.println("WARNING: Couldn't find field entry " + mapping.getKey() + " (" + mapping.getValue().getDeobfName() + ") in jar. Mapping was dropped.");
                         }
-                        for (java.util.Map.Entry<BehaviorEntry, MethodMapping> mapping : checker.getDroppedMethodMappings().entrySet()) {
+                        for (Map.Entry<MethodEntry, MethodMapping> mapping : checker.getDroppedMethodMappings().entrySet()) {
                                 System.out.println("WARNING: Couldn't find behavior entry " + mapping.getKey() + " (" + mapping.getValue().getDeobfName() + ") in jar. Mapping was dropped.");
                         }
                 }
@@ -123,7 +128,7 @@ public class Deobfuscator {
 
         public Translator getTranslator(TranslationDirection direction) {
                 return this.translatorCache.computeIfAbsent(direction,
-                        k -> this.mappings.getTranslator(direction, this.jarIndex.getTranslationIndex()));
+                                k -> this.mappings.getTranslator(direction, this.jarIndex.getTranslationIndex()));
         }
 
         public void getSeparatedClasses(List<ClassEntry> obfClasses, List<ClassEntry> deobfClasses) {
@@ -150,10 +155,11 @@ public class Deobfuscator {
 
         public TranslatingTypeLoader createTypeLoader() {
                 return new TranslatingTypeLoader(
-                        this.jar,
-                        this.jarIndex,
-                        getTranslator(TranslationDirection.Obfuscating),
-                        getTranslator(TranslationDirection.Deobfuscating)
+                                this.parsedJar,
+                                this.jarIndex,
+                                this.entryPool,
+                                getTranslator(TranslationDirection.OBFUSCATING),
+                                getTranslator(TranslationDirection.DEOBFUSCATING)
                 );
         }
 
@@ -172,15 +178,15 @@ public class Deobfuscator {
                         deobfClassName = classMapping.getDeobfName();
                 }
 
-                // set the type loader
+                // set the desc loader
                 TranslatingTypeLoader loader = createTypeLoader();
                 this.settings.setTypeLoader(loader);
 
-                // see if procyon can find the type
+                // see if procyon can find the desc
                 TypeReference type = new MetadataSystem(loader).lookupType(deobfClassName);
                 if (type == null) {
-                        throw new Error(String.format("Unable to find type: %s (deobf: %s)\nTried class names: %s",
-                                className, deobfClassName, loader.getClassNamesToTry(deobfClassName)
+                        throw new Error(String.format("Unable to find desc: %s (deobf: %s)\nTried class names: %s",
+                                        className, deobfClassName, loader.getClassNamesToTry(deobfClassName)
                         ));
                 }
                 TypeDefinition resolvedType = type.resolve();
@@ -208,7 +214,7 @@ public class Deobfuscator {
                 } else {
                         index = new SourceIndex(source);
                 }
-                sourceTree.acceptVisitor(new SourceIndexVisitor(), index);
+                sourceTree.acceptVisitor(new SourceIndexVisitor(entryPool), index);
 
                 // DEBUG
                 // sourceTree.acceptVisitor( new TreeDumpVisitor( new File( "tree.txt" ) ), null );
@@ -221,10 +227,10 @@ public class Deobfuscator {
                         Entry obfEntry = obfuscateEntry(deobfReference.entry);
 
                         // try to resolve the class
-                        ClassEntry resolvedObfClassEntry = this.jarIndex.getTranslationIndex().resolveEntryClass(obfEntry);
-                        if (resolvedObfClassEntry != null && !resolvedObfClassEntry.equals(obfEntry.getClassEntry())) {
+                        ClassEntry resolvedObfClassEntry = this.jarIndex.getTranslationIndex().resolveEntryOwner(obfEntry);
+                        if (resolvedObfClassEntry != null && !resolvedObfClassEntry.equals(obfEntry.getOwnerClassEntry())) {
                                 // change the class of the entry
-                                obfEntry = obfEntry.cloneToNewClass(resolvedObfClassEntry);
+                                obfEntry = obfEntry.updateOwnership(resolvedObfClassEntry);
 
                                 // save the new deobfuscated reference
                                 deobfReference.entry = deobfuscateEntry(obfEntry);
@@ -305,18 +311,14 @@ public class Deobfuscator {
                 }
         }
 
-        private boolean isBehaviorProvider(ClassEntry classObfEntry, BehaviorEntry behaviorEntry) {
-                if (behaviorEntry instanceof MethodEntry) {
-                        MethodEntry methodEntry = (MethodEntry) behaviorEntry;
+        private boolean isMethodProvider(ClassEntry classObfEntry, MethodEntry methodEntry) {
+                Set<ClassEntry> classEntries = new HashSet<>();
+                addAllPotentialAncestors(classEntries, classObfEntry);
 
-                        Set<ClassEntry> classEntries = new HashSet<>();
-                        addAllPotentialAncestors(classEntries, classObfEntry);
-
-                        for (ClassEntry parentEntry : classEntries) {
-                                MethodEntry ancestorMethodEntry = new MethodEntry(parentEntry, methodEntry.getName(), methodEntry.getSignature());
-                                if (jarIndex.containsObfBehavior(ancestorMethodEntry)) {
-                                        return false;
-                                }
+                for (ClassEntry parentEntry : classEntries) {
+                        MethodEntry ancestorMethodEntry = entryPool.getMethod(parentEntry, methodEntry.getName(), methodEntry.getDesc());
+                        if (jarIndex.containsObfMethod(ancestorMethodEntry)) {
+                                return false;
                         }
                 }
 
@@ -332,7 +334,7 @@ public class Deobfuscator {
                 for (ClassMapping classMapping : Lists.newArrayList(getMappings().classes())) {
                         progress.onProgress(i++, classMapping.getDeobfName());
                         rebuildMethodNames(classMapping, renameClassMap);
-                        for(ClassMapping innerClass : classMapping.innerClasses()){
+                        for (ClassMapping innerClass : classMapping.innerClasses()) {
                                 rebuildMethodNames(innerClass, renameClassMap);
                         }
                 }
@@ -356,29 +358,29 @@ public class Deobfuscator {
 
                                 try {
                                         rename(obfEntry, name);
-                                } catch (IllegalNameException exception)
-                                {
+                                } catch (IllegalNameException exception) {
                                         System.out.println("WARNING: " + exception.getMessage());
                                 }
                         }
                 }
         }
 
-        private void rebuildMethodNames(ClassMapping classMapping, Map<ClassMapping, Map<Entry, String>> renameClassMap){
+        private void rebuildMethodNames(ClassMapping classMapping, Map<ClassMapping, Map<Entry, String>> renameClassMap) {
                 Map<Entry, String> renameEntries = new HashMap<>();
 
                 for (MethodMapping methodMapping : Lists.newArrayList(classMapping.methods())) {
                         ClassEntry classObfEntry = classMapping.getObfEntry();
-                        BehaviorEntry obfEntry = methodMapping.getObfEntry(classObfEntry);
+                        MethodEntry obfEntry = methodMapping.getObfEntry(classObfEntry);
 
-                        if (isBehaviorProvider(classObfEntry, obfEntry)) {
-                                if (hasDeobfuscatedName(obfEntry) && !(obfEntry instanceof ConstructorEntry)
-                                        && !(methodMapping.getDeobfName().equals(methodMapping.getObfName()))) {
+                        if (isMethodProvider(classObfEntry, obfEntry)) {
+                                if (hasDeobfuscatedName(obfEntry)
+                                                && !(methodMapping.getDeobfName().equals(methodMapping.getObfName()))) {
                                         renameEntries.put(obfEntry, methodMapping.getDeobfName());
                                 }
 
-                                for (ArgumentMapping argumentMapping : Lists.newArrayList(methodMapping.arguments())) {
-                                        Entry argObfEntry = argumentMapping.getObfEntry(obfEntry);
+                                ArrayList<LocalVariableMapping> arguments = Lists.newArrayList(methodMapping.arguments());
+                                for (LocalVariableMapping localVariableMapping : arguments) {
+                                        Entry argObfEntry = localVariableMapping.getObfEntry(obfEntry);
                                         if (hasDeobfuscatedName(argObfEntry)) {
                                                 renameEntries.put(argObfEntry, deobfuscateEntry(argObfEntry).getName());
                                         }
@@ -390,45 +392,44 @@ public class Deobfuscator {
         }
 
 
-
         public void writeJar(File out, ProgressListener progress) {
-                transformJar(out, progress, createTypeLoader()::transformClass);
+                transformJar(out, progress, createTypeLoader()::createTransformer);
         }
 
         public void protectifyJar(File out, ProgressListener progress) {
-                transformJar(out, progress, ClassProtectifier::protectify);
+                transformJar(out, progress, (node, writer) -> node.accept(new ClassProtectifier(Opcodes.ASM5, writer)));
         }
 
         public void publifyJar(File out, ProgressListener progress) {
-                transformJar(out, progress, ClassPublifier::publify);
+                transformJar(out, progress, (node, writer) -> node.accept(new ClassPublifier(Opcodes.ASM5, writer)));
         }
 
         public void transformJar(File out, ProgressListener progress, ClassTransformer transformer) {
                 try (JarOutputStream outJar = new JarOutputStream(new FileOutputStream(out))) {
                         if (progress != null) {
-                                progress.init(JarClassIterator.getClassEntries(this.jar).size(), "Transforming classes...");
+                                progress.init(parsedJar.getClassCount(), "Transforming classes...");
                         }
 
-                        int i = 0;
-                        for (CtClass c : JarClassIterator.classes(this.jar)) {
+                        AtomicInteger i = new AtomicInteger();
+                        parsedJar.visit(node -> {
                                 if (progress != null) {
-                                        progress.onProgress(i++, c.getName());
+                                        progress.onProgress(i.getAndIncrement(), node.name);
                                 }
 
                                 try {
-                                        c = transformer.transform(c);
-                                        outJar.putNextEntry(new JarEntry(c.getName().replace('.', '/') + ".class"));
-                                        outJar.write(c.toBytecode());
+                                        ClassWriter writer = new ClassWriter(0);
+                                        transformer.write(node, writer);
+                                        outJar.putNextEntry(new JarEntry(node.name.replace('.', '/') + ".class"));
+                                        outJar.write(writer.toByteArray());
                                         outJar.closeEntry();
                                 } catch (Throwable t) {
-                                        throw new Error("Unable to transform class " + c.getName(), t);
+                                        throw new Error("Unable to transform class " + node.name, t);
                                 }
-                        }
+                        });
+
                         if (progress != null) {
-                                progress.onProgress(i, "Done!");
+                                progress.onProgress(i.get(), "Done!");
                         }
-
-                        outJar.close();
                 } catch (IOException ex) {
                         throw new Error("Unable to write to Jar file!");
                 }
@@ -438,14 +439,22 @@ public class Deobfuscator {
                 if (deobfEntry == null) {
                         return null;
                 }
-                return getTranslator(TranslationDirection.Obfuscating).translateEntry(deobfEntry);
+                T translatedEntry = getTranslator(TranslationDirection.OBFUSCATING).getTranslatedEntry(deobfEntry);
+                if (translatedEntry == null) {
+                        return deobfEntry;
+                }
+                return translatedEntry;
         }
 
         public <T extends Entry> T deobfuscateEntry(T obfEntry) {
                 if (obfEntry == null) {
                         return null;
                 }
-                return getTranslator(TranslationDirection.Deobfuscating).translateEntry(obfEntry);
+                T translatedEntry = getTranslator(TranslationDirection.DEOBFUSCATING).getTranslatedEntry(obfEntry);
+                if (translatedEntry == null) {
+                        return obfEntry;
+                }
+                return translatedEntry;
         }
 
         public <E extends Entry, C extends Entry> EntryReference<E, C> obfuscateReference(EntryReference<E, C> deobfReference) {
@@ -473,7 +482,7 @@ public class Deobfuscator {
                         // HACKHACK: Object methods are not obfuscated identifiers
                         MethodEntry obfMethodEntry = (MethodEntry) obfEntry;
                         String name = obfMethodEntry.getName();
-                        String sig = obfMethodEntry.getSignature().toString();
+                        String sig = obfMethodEntry.getDesc().toString();
                         if (name.equals("clone") && sig.equals("()Ljava/lang/Object;")) {
                                 return false;
                         } else if (name.equals("equals") && sig.equals("(Ljava/lang/Object;)Z")) {
@@ -499,7 +508,7 @@ public class Deobfuscator {
                         }
 
                         // FIXME: HACK EVEN MORE HACK!
-                        if (hack && this.jarIndex.containsObfEntry(obfEntry.getClassEntry()))
+                        if (hack && this.jarIndex.containsObfEntry(obfEntry.getOwnerClassEntry()))
                                 return true;
                 }
 
@@ -515,27 +524,24 @@ public class Deobfuscator {
         }
 
         public boolean hasDeobfuscatedName(Entry obfEntry) {
-                Translator translator = getTranslator(TranslationDirection.Deobfuscating);
+                Translator translator = getTranslator(TranslationDirection.DEOBFUSCATING);
                 if (obfEntry instanceof ClassEntry) {
                         ClassEntry obfClass = (ClassEntry) obfEntry;
                         List<ClassMapping> mappingChain = this.mappings.getClassMappingChain(obfClass);
                         ClassMapping classMapping = mappingChain.get(mappingChain.size() - 1);
                         return classMapping != null && classMapping.getDeobfName() != null;
                 } else if (obfEntry instanceof FieldEntry) {
-                        return translator.translate((FieldEntry) obfEntry) != null;
+                        return translator.getTranslatedField((FieldEntry) obfEntry) != null;
                 } else if (obfEntry instanceof MethodEntry) {
-                        return translator.translate((MethodEntry) obfEntry) != null;
-                } else if (obfEntry instanceof ConstructorEntry) {
-                        // constructors have no names
-                        return false;
-                } else if (obfEntry instanceof ArgumentEntry) {
-                        return translator.translate((ArgumentEntry) obfEntry) != null;
+                        MethodEntry methodEntry = (MethodEntry) obfEntry;
+                        if (methodEntry.isConstructor()) {
+                                return false;
+                        }
+                        return translator.getTranslatedMethod(methodEntry) != null;
                 } else if (obfEntry instanceof LocalVariableEntry) {
-                        // TODO: Implement it
-                        //return translator.translate((LocalVariableEntry)obfEntry) != null;
-                        return false;
+                        return translator.getTranslatedVariable((LocalVariableEntry) obfEntry) != null;
                 } else {
-                        throw new Error("Unknown entry type: " + obfEntry.getClass().getName());
+                        throw new Error("Unknown entry desc: " + obfEntry.getClass().getName());
                 }
         }
 
@@ -547,19 +553,18 @@ public class Deobfuscator {
 
         public void rename(Entry obfEntry, String newName, boolean clearCache) {
                 if (obfEntry instanceof ClassEntry) {
-                        this.renamer.setClassName((ClassEntry) obfEntry, Descriptor.toJvmName(newName));
+                        this.renamer.setClassName((ClassEntry) obfEntry, newName);
                 } else if (obfEntry instanceof FieldEntry) {
                         this.renamer.setFieldName((FieldEntry) obfEntry, newName);
                 } else if (obfEntry instanceof MethodEntry) {
+                        if (((MethodEntry) obfEntry).isConstructor()) {
+                                throw new IllegalArgumentException("Cannot rename constructors");
+                        }
                         this.renamer.setMethodTreeName((MethodEntry) obfEntry, newName);
-                } else if (obfEntry instanceof ConstructorEntry) {
-                        throw new IllegalArgumentException("Cannot rename constructors");
-                } else if (obfEntry instanceof ArgumentEntry) {
-                        this.renamer.setArgumentTreeName((ArgumentEntry) obfEntry, newName);
                 } else if (obfEntry instanceof LocalVariableEntry) {
-                        // TODO: Implement it
+                        this.renamer.setLocalVariableTreeName((LocalVariableEntry) obfEntry, newName);
                 } else {
-                        throw new Error("Unknown entry type: " + obfEntry.getClass().getName());
+                        throw new Error("Unknown entry desc: " + obfEntry.getClass().getName());
                 }
 
                 // clear caches
@@ -573,13 +578,14 @@ public class Deobfuscator {
                 } else if (obfEntry instanceof FieldEntry) {
                         this.renamer.removeFieldMapping((FieldEntry) obfEntry);
                 } else if (obfEntry instanceof MethodEntry) {
+                        if (((MethodEntry) obfEntry).isConstructor()) {
+                                throw new IllegalArgumentException("Cannot rename constructors");
+                        }
                         this.renamer.removeMethodTreeMapping((MethodEntry) obfEntry);
-                } else if (obfEntry instanceof ConstructorEntry) {
-                        throw new IllegalArgumentException("Cannot rename constructors");
-                } else if (obfEntry instanceof ArgumentEntry) {
-                        this.renamer.removeArgumentMapping((ArgumentEntry) obfEntry);
+                } else if (obfEntry instanceof LocalVariableEntry) {
+                        this.renamer.removeLocalVariableMapping((LocalVariableEntry) obfEntry);
                 } else {
-                        throw new Error("Unknown entry type: " + obfEntry);
+                        throw new Error("Unknown entry desc: " + obfEntry);
                 }
 
                 // clear caches
@@ -592,15 +598,15 @@ public class Deobfuscator {
                 } else if (obfEntry instanceof FieldEntry) {
                         this.renamer.markFieldAsDeobfuscated((FieldEntry) obfEntry);
                 } else if (obfEntry instanceof MethodEntry) {
-                        this.renamer.markMethodTreeAsDeobfuscated((MethodEntry) obfEntry);
-                } else if (obfEntry instanceof ConstructorEntry) {
-                        throw new IllegalArgumentException("Cannot rename constructors");
-                } else if (obfEntry instanceof ArgumentEntry) {
-                        this.renamer.markArgumentAsDeobfuscated((ArgumentEntry) obfEntry);
+                        MethodEntry methodEntry = (MethodEntry) obfEntry;
+                        if (methodEntry.isConstructor()) {
+                                throw new IllegalArgumentException("Cannot rename constructors");
+                        }
+                        this.renamer.markMethodTreeAsDeobfuscated(methodEntry);
                 } else if (obfEntry instanceof LocalVariableEntry) {
-                        // TODO: Implement it
+                        this.renamer.markArgumentAsDeobfuscated((LocalVariableEntry) obfEntry);
                 } else {
-                        throw new Error("Unknown entry type: " + obfEntry);
+                        throw new Error("Unknown entry desc: " + obfEntry);
                 }
 
                 // clear caches
@@ -613,17 +619,24 @@ public class Deobfuscator {
                         this.renamer.setClassModifier((ClassEntry) obfEntry, modifierEntry);
                 else if (obfEntry instanceof FieldEntry)
                         this.renamer.setFieldModifier((FieldEntry) obfEntry, modifierEntry);
-                else if (obfEntry instanceof BehaviorEntry)
-                        this.renamer.setMethodModifier((BehaviorEntry) obfEntry, modifierEntry);
+                else if (obfEntry instanceof MethodEntry)
+                        this.renamer.setMethodModifier((MethodEntry) obfEntry, modifierEntry);
                 else
-                        throw new Error("Unknown entry type: " + obfEntry);
+                        throw new Error("Unknown entry desc: " + obfEntry);
         }
 
-        public Mappings.EntryModifier getModifier(Entry obEntry) {
-                Entry entry = obfuscateEntry(obEntry);
+        public Mappings.EntryModifier getModifier(Entry obfEntry) {
+                Entry entry = obfuscateEntry(obfEntry);
                 if (entry != null)
-                        obEntry = entry;
-                return getTranslator(TranslationDirection.Deobfuscating).getModifier(obEntry);
+                        obfEntry = entry;
+                if (obfEntry instanceof ClassEntry)
+                        return this.renamer.getClassModifier((ClassEntry) obfEntry);
+                else if (obfEntry instanceof FieldEntry)
+                        return this.renamer.getFieldModifier((FieldEntry) obfEntry);
+                else if (obfEntry instanceof MethodEntry)
+                        return this.renamer.getMethodModfifier((MethodEntry) obfEntry);
+                else
+                        throw new Error("Unknown entry desc: " + obfEntry);
         }
 
         public interface ProgressListener {
@@ -633,6 +646,6 @@ public class Deobfuscator {
         }
 
         public interface ClassTransformer {
-                CtClass transform(CtClass c) throws Exception;
+                void write(ClassNode node, ClassWriter writer);
         }
 }
diff --git a/src/main/java/cuchaz/enigma/TranslatingTypeLoader.java b/src/main/java/cuchaz/enigma/TranslatingTypeLoader.java
index 2a2041a..c91070f 100644
--- a/src/main/java/cuchaz/enigma/TranslatingTypeLoader.java
+++ b/src/main/java/cuchaz/enigma/TranslatingTypeLoader.java
@@ -16,37 +16,33 @@ import com.google.common.collect.Maps;
 import com.strobel.assembler.metadata.Buffer;
 import com.strobel.assembler.metadata.ClasspathTypeLoader;
 import com.strobel.assembler.metadata.ITypeLoader;
-import cuchaz.enigma.analysis.BridgeMarker;
 import cuchaz.enigma.analysis.JarIndex;
-import cuchaz.enigma.bytecode.translators.ClassTranslator;
-import cuchaz.enigma.bytecode.translators.InnerClassWriter;
-import cuchaz.enigma.bytecode.translators.LocalVariableTranslator;
-import cuchaz.enigma.bytecode.translators.MethodParameterTranslator;
+import cuchaz.enigma.analysis.ParsedJar;
+import cuchaz.enigma.bytecode.translators.TranslationClassVisitor;
 import cuchaz.enigma.mapping.ClassEntry;
+import cuchaz.enigma.mapping.ReferencedEntryPool;
 import cuchaz.enigma.mapping.Translator;
-import javassist.*;
-import javassist.bytecode.Descriptor;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.ClassNode;
 
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
 import java.util.List;
 import java.util.Map;
-import java.util.jar.JarEntry;
-import java.util.jar.JarFile;
 
 public class TranslatingTypeLoader implements ITypeLoader {
 
-        private JarFile jar;
-        private JarIndex jarIndex;
-        private Translator obfuscatingTranslator;
-        private Translator deobfuscatingTranslator;
-        private Map<String, byte[]> cache;
-        private ClasspathTypeLoader defaultTypeLoader;
+        private final ParsedJar jar;
+        private final JarIndex jarIndex;
+        private final ReferencedEntryPool entryPool;
+        private final Translator obfuscatingTranslator;
+        private final Translator deobfuscatingTranslator;
+        private final Map<String, byte[]> cache;
+        private final ClasspathTypeLoader defaultTypeLoader;
 
-        public TranslatingTypeLoader(JarFile jar, JarIndex jarIndex, Translator obfuscatingTranslator, Translator deobfuscatingTranslator) {
+        public TranslatingTypeLoader(ParsedJar jar, JarIndex jarIndex, ReferencedEntryPool entryPool, Translator obfuscatingTranslator, Translator deobfuscatingTranslator) {
                 this.jar = jar;
                 this.jarIndex = jarIndex;
+                this.entryPool = entryPool;
                 this.obfuscatingTranslator = obfuscatingTranslator;
                 this.deobfuscatingTranslator = deobfuscatingTranslator;
                 this.cache = Maps.newHashMap();
@@ -71,7 +67,7 @@ public class TranslatingTypeLoader implements ITypeLoader {
                 }
 
                 if (data == null) {
-                        // chain to default type loader
+                        // chain to default desc loader
                         return this.defaultTypeLoader.tryLoadType(className, out);
                 }
 
@@ -82,36 +78,18 @@ public class TranslatingTypeLoader implements ITypeLoader {
                 return true;
         }
 
-        public CtClass loadClass(String deobfClassName) {
-
-                byte[] data = loadType(deobfClassName);
-                if (data == null) {
-                        return null;
-                }
-
-                // return a javassist handle for the class
-                String javaClassFileName = Descriptor.toJavaName(deobfClassName);
-                ClassPool classPool = new ClassPool();
-                classPool.insertClassPath(new ByteArrayClassPath(javaClassFileName, data));
-                try {
-                        return classPool.get(javaClassFileName);
-                } catch (NotFoundException ex) {
-                        throw new Error(ex);
-                }
-        }
-
         private byte[] loadType(String className) {
 
                 // NOTE: don't know if class name is obf or deobf
                 ClassEntry classEntry = new ClassEntry(className);
-                ClassEntry obfClassEntry = this.obfuscatingTranslator.translateEntry(classEntry);
+                ClassEntry obfClassEntry = this.obfuscatingTranslator.getTranslatedClass(classEntry);
 
                 // is this an inner class referenced directly? (ie trying to load b instead of a$b)
                 if (!obfClassEntry.isInnerClass()) {
                         List<ClassEntry> classChain = this.jarIndex.getObfClassChain(obfClassEntry);
                         if (classChain.size() > 1) {
                                 System.err.println(String.format("WARNING: no class %s after inner class reconstruction. Try %s",
-                                        className, obfClassEntry.buildClassEntry(classChain)
+                                                className, obfClassEntry.buildClassEntry(classChain)
                                 ));
                                 return null;
                         }
@@ -126,56 +104,26 @@ public class TranslatingTypeLoader implements ITypeLoader {
                 //System.out.println(String.format("Looking for %s (obf: %s)", classEntry.getName(), obfClassEntry.getName()));
 
                 // find the class in the jar
-                String classInJarName = findClassInJar(obfClassEntry);
-                if (classInJarName == null) {
+                ClassNode node = findClassInJar(obfClassEntry);
+                if (node == null) {
                         // couldn't find it
                         return null;
                 }
 
-                try {
-                        // read the class file into a buffer
-                        ByteArrayOutputStream data = new ByteArrayOutputStream();
-                        byte[] buf = new byte[1024 * 1024]; // 1 KiB
-                        InputStream in = this.jar.getInputStream(this.jar.getJarEntry(classInJarName + ".class"));
-                        while (true) {
-                                int bytesRead = in.read(buf);
-                                if (bytesRead <= 0) {
-                                        break;
-                                }
-                                data.write(buf, 0, bytesRead);
-                        }
-                        data.close();
-                        in.close();
-                        buf = data.toByteArray();
-
-                        // load the javassist handle to the raw class
-                        ClassPool classPool = new ClassPool();
-                        String classInJarJavaName = Descriptor.toJavaName(classInJarName);
-                        classPool.insertClassPath(new ByteArrayClassPath(classInJarJavaName, buf));
-                        CtClass c = classPool.get(classInJarJavaName);
-
-                        c = transformClass(c);
+                ClassWriter writer = new ClassWriter(0);
+                createTransformer(node, writer);
 
-                        // sanity checking
-                        assertClassName(c, classEntry);
-
-                        // DEBUG
-                        //Util.writeClass( c );
-
-                        // we have a transformed class!
-                        return c.toBytecode();
-                } catch (IOException | NotFoundException | CannotCompileException ex) {
-                        throw new Error(ex);
-                }
+                // we have a transformed class!
+                return writer.toByteArray();
         }
 
-        private String findClassInJar(ClassEntry obfClassEntry) {
+        private ClassNode findClassInJar(ClassEntry obfClassEntry) {
 
                 // try to find the class in the jar
                 for (String className : getClassNamesToTry(obfClassEntry)) {
-                        JarEntry jarEntry = this.jar.getJarEntry(className + ".class");
-                        if (jarEntry != null) {
-                                return className;
+                        ClassNode node = this.jar.getClassNode(className);
+                        if (node != null) {
+                                return node;
                         }
                 }
 
@@ -184,7 +132,7 @@ public class TranslatingTypeLoader implements ITypeLoader {
         }
 
         public List<String> getClassNamesToTry(String className) {
-                return getClassNamesToTry(this.obfuscatingTranslator.translateEntry(new ClassEntry(className)));
+                return getClassNamesToTry(this.obfuscatingTranslator.getTranslatedClass(new ClassEntry(className)));
         }
 
         public List<String> getClassNamesToTry(ClassEntry obfClassEntry) {
@@ -197,36 +145,7 @@ public class TranslatingTypeLoader implements ITypeLoader {
                 return classNamesToTry;
         }
 
-        public CtClass transformClass(CtClass c)
-                throws IOException, NotFoundException, CannotCompileException {
-
-                // reconstruct inner classes
-                InnerClassWriter.write(jarIndex, c);
-
-                // re-get the javassist handle since we changed class names
-                ClassEntry obfClassEntry = new ClassEntry(Descriptor.toJvmName(c.getName()));
-                String javaClassReconstructedName = Descriptor.toJavaName(obfClassEntry.getName());
-                ClassPool classPool = new ClassPool();
-                classPool.insertClassPath(new ByteArrayClassPath(javaClassReconstructedName, c.toBytecode()));
-                c = classPool.get(javaClassReconstructedName);
-
-                // check that the file is correct after inner class reconstruction (ie cause Javassist to fail fast if something is wrong)
-                assertClassName(c, obfClassEntry);
-
-                // do all kinds of deobfuscating transformations on the class
-                BridgeMarker.markBridges(this.jarIndex, c);
-                MethodParameterTranslator.translate(this.deobfuscatingTranslator, c);
-                LocalVariableTranslator.translate(this.deobfuscatingTranslator, c);
-                ClassTranslator.translate(this.deobfuscatingTranslator, c);
-
-                return c;
-        }
-
-        private void assertClassName(CtClass c, ClassEntry obfClassEntry) {
-                String name1 = Descriptor.toJvmName(c.getName());
-                assert (name1.equals(obfClassEntry.getName())) : String.format("Looking for %s, instead found %s", obfClassEntry.getName(), name1);
-
-                String name2 = Descriptor.toJvmName(c.getClassFile().getName());
-                assert (name2.equals(obfClassEntry.getName())) : String.format("Looking for %s, instead found %s", obfClassEntry.getName(), name2);
+        public void createTransformer(ClassNode node, ClassWriter writer) {
+                node.accept(new TranslationClassVisitor(deobfuscatingTranslator, jarIndex, entryPool, Opcodes.ASM5, writer));
         }
 }
diff --git a/src/main/java/cuchaz/enigma/analysis/Access.java b/src/main/java/cuchaz/enigma/analysis/Access.java
index 547d85e..8181418 100644
--- a/src/main/java/cuchaz/enigma/analysis/Access.java
+++ b/src/main/java/cuchaz/enigma/analysis/Access.java
@@ -11,8 +11,7 @@
 
 package cuchaz.enigma.analysis;
 
-import javassist.CtBehavior;
-import javassist.CtField;
+import cuchaz.enigma.bytecode.AccessFlags;
 
 import java.lang.reflect.Modifier;
 
@@ -20,12 +19,8 @@ public enum Access {
 
         PUBLIC, PROTECTED, PACKAGE, PRIVATE;
 
-        public static Access get(CtBehavior behavior) {
-                return get(behavior.getModifiers());
-        }
-
-        public static Access get(CtField field) {
-                return get(field.getModifiers());
+        public static Access get(AccessFlags flags) {
+                return get(flags.getFlags());
         }
 
         public static Access get(int modifiers) {
diff --git a/src/main/java/cuchaz/enigma/analysis/BridgeMarker.java b/src/main/java/cuchaz/enigma/analysis/BridgeMarker.java
deleted file mode 100644
index a2f1f90..0000000
--- a/src/main/java/cuchaz/enigma/analysis/BridgeMarker.java
+++ /dev/null
@@ -1,38 +0,0 @@
-/*******************************************************************************
- * 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.analysis;
-
-import cuchaz.enigma.mapping.EntryFactory;
-import cuchaz.enigma.mapping.MethodEntry;
-import javassist.CtClass;
-import javassist.CtMethod;
-import javassist.bytecode.AccessFlag;
-
-public class BridgeMarker {
-
-        public static void markBridges(JarIndex jarIndex, CtClass c) {
-
-                for (CtMethod method : c.getDeclaredMethods()) {
-                        MethodEntry methodEntry = EntryFactory.getMethodEntry(method);
-
-                        // is this a bridge method?
-                        MethodEntry bridgedMethodEntry = jarIndex.getBridgedMethod(methodEntry);
-                        if (bridgedMethodEntry != null) {
-
-                                // it's a bridge method! add the bridge flag
-                                int flags = method.getMethodInfo().getAccessFlags();
-                                flags |= AccessFlag.BRIDGE;
-                                method.getMethodInfo().setAccessFlags(flags);
-                        }
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/analysis/ClassImplementationsTreeNode.java b/src/main/java/cuchaz/enigma/analysis/ClassImplementationsTreeNode.java
index f2fb2f8..d0e1ddb 100644
--- a/src/main/java/cuchaz/enigma/analysis/ClassImplementationsTreeNode.java
+++ b/src/main/java/cuchaz/enigma/analysis/ClassImplementationsTreeNode.java
@@ -21,8 +21,8 @@ import java.util.List;
 
 public class ClassImplementationsTreeNode extends DefaultMutableTreeNode {
 
-        private Translator deobfuscatingTranslator;
-        private ClassEntry entry;
+        private final Translator deobfuscatingTranslator;
+        private final ClassEntry entry;
 
         public ClassImplementationsTreeNode(Translator deobfuscatingTranslator, ClassEntry entry) {
                 this.deobfuscatingTranslator = deobfuscatingTranslator;
@@ -31,7 +31,7 @@ public class ClassImplementationsTreeNode extends DefaultMutableTreeNode {
 
         public static ClassImplementationsTreeNode findNode(ClassImplementationsTreeNode node, MethodEntry entry) {
                 // is this the node?
-                if (node.entry.equals(entry.getClassEntry())) {
+                if (node.entry.equals(entry.getOwnerClassEntry())) {
                         return node;
                 }
 
@@ -50,7 +50,7 @@ public class ClassImplementationsTreeNode extends DefaultMutableTreeNode {
         }
 
         public String getDeobfClassName() {
-                return this.deobfuscatingTranslator.translateClass(this.entry.getClassName());
+                return this.deobfuscatingTranslator.getTranslatedClass(entry).getClassName();
         }
 
         @Override
diff --git a/src/main/java/cuchaz/enigma/analysis/ClassInheritanceTreeNode.java b/src/main/java/cuchaz/enigma/analysis/ClassInheritanceTreeNode.java
index 24e7cb0..8fd71b7 100644
--- a/src/main/java/cuchaz/enigma/analysis/ClassInheritanceTreeNode.java
+++ b/src/main/java/cuchaz/enigma/analysis/ClassInheritanceTreeNode.java
@@ -20,12 +20,12 @@ import java.util.List;
 
 public class ClassInheritanceTreeNode extends DefaultMutableTreeNode {
 
-        private Translator deobfuscatingTranslator;
-        private String obfClassName;
+        private final Translator deobfuscatingTranslator;
+        private final ClassEntry obfClassEntry;
 
         public ClassInheritanceTreeNode(Translator deobfuscatingTranslator, String obfClassName) {
                 this.deobfuscatingTranslator = deobfuscatingTranslator;
-                this.obfClassName = obfClassName;
+                this.obfClassEntry = new ClassEntry(obfClassName);
         }
 
         public static ClassInheritanceTreeNode findNode(ClassInheritanceTreeNode node, ClassEntry entry) {
@@ -45,11 +45,11 @@ public class ClassInheritanceTreeNode extends DefaultMutableTreeNode {
         }
 
         public String getObfClassName() {
-                return this.obfClassName;
+                return this.obfClassEntry.getClassName();
         }
 
         public String getDeobfClassName() {
-                return this.deobfuscatingTranslator.translateClass(this.obfClassName);
+                return this.deobfuscatingTranslator.getTranslatedClass(this.obfClassEntry).getClassName();
         }
 
         @Override
@@ -58,13 +58,13 @@ public class ClassInheritanceTreeNode extends DefaultMutableTreeNode {
                 if (deobfClassName != null) {
                         return deobfClassName;
                 }
-                return this.obfClassName;
+                return this.obfClassEntry.getName();
         }
 
         public void load(TranslationIndex ancestries, boolean recurse) {
                 // get all the child nodes
                 List<ClassInheritanceTreeNode> nodes = Lists.newArrayList();
-                for (ClassEntry subclassEntry : ancestries.getSubclass(new ClassEntry(this.obfClassName))) {
+                for (ClassEntry subclassEntry : ancestries.getSubclass(this.obfClassEntry)) {
                         nodes.add(new ClassInheritanceTreeNode(this.deobfuscatingTranslator, subclassEntry.getName()));
                 }
 
diff --git a/src/main/java/cuchaz/enigma/analysis/EntryReference.java b/src/main/java/cuchaz/enigma/analysis/EntryReference.java
index 3761fca..b972585 100644
--- a/src/main/java/cuchaz/enigma/analysis/EntryReference.java
+++ b/src/main/java/cuchaz/enigma/analysis/EntryReference.java
@@ -12,8 +12,8 @@
 package cuchaz.enigma.analysis;
 
 import cuchaz.enigma.mapping.ClassEntry;
-import cuchaz.enigma.mapping.ConstructorEntry;
 import cuchaz.enigma.mapping.Entry;
+import cuchaz.enigma.mapping.MethodEntry;
 import cuchaz.enigma.utils.Utils;
 
 import java.util.Arrays;
@@ -21,7 +21,7 @@ import java.util.List;
 
 public class EntryReference<E extends Entry, C extends Entry> {
 
-        private static final List<String> ConstructorNonNames = Arrays.asList("this", "super", "static");
+        private static final List<String> CONSTRUCTOR_NON_NAMES = Arrays.asList("this", "super", "static");
         public E entry;
         public C context;
 
@@ -40,7 +40,7 @@ public class EntryReference<E extends Entry, C extends Entry> {
                 this.context = context;
 
                 this.sourceName = sourceName != null && !sourceName.isEmpty();
-                if (entry instanceof ConstructorEntry && ConstructorNonNames.contains(sourceName)) {
+                if (entry instanceof MethodEntry && ((MethodEntry) entry).isConstructor() && CONSTRUCTOR_NON_NAMES.contains(sourceName)) {
                         this.sourceName = false;
                 }
         }
@@ -53,9 +53,9 @@ public class EntryReference<E extends Entry, C extends Entry> {
 
         public ClassEntry getLocationClassEntry() {
                 if (context != null) {
-                        return context.getClassEntry();
+                        return context.getOwnerClassEntry();
                 }
-                return entry.getClassEntry();
+                return entry.getOwnerClassEntry();
         }
 
         public boolean isNamed() {
@@ -63,9 +63,9 @@ public class EntryReference<E extends Entry, C extends Entry> {
         }
 
         public Entry getNameableEntry() {
-                if (entry instanceof ConstructorEntry) {
+                if (entry instanceof MethodEntry && ((MethodEntry) entry).isConstructor()) {
                         // renaming a constructor really means renaming the class
-                        return entry.getClassEntry();
+                        return entry.getOwnerClassEntry();
                 }
                 return entry;
         }
diff --git a/src/main/java/cuchaz/enigma/analysis/EntryRenamer.java b/src/main/java/cuchaz/enigma/analysis/EntryRenamer.java
index 75806c3..b0bcc91 100644
--- a/src/main/java/cuchaz/enigma/analysis/EntryRenamer.java
+++ b/src/main/java/cuchaz/enigma/analysis/EntryRenamer.java
@@ -87,18 +87,18 @@ public class EntryRenamer {
                         MethodEntry newMethodEntry = renames.get(methodEntry);
                         if (newMethodEntry != null) {
                                 return (T) new MethodEntry(
-                                        methodEntry.getClassEntry(),
-                                        newMethodEntry.getName(),
-                                        methodEntry.getSignature()
+                                                methodEntry.getOwnerClassEntry(),
+                                                newMethodEntry.getName(),
+                                                methodEntry.getDesc()
                                 );
                         }
                         return thing;
-                } else if (thing instanceof ArgumentEntry) {
-                        ArgumentEntry argumentEntry = (ArgumentEntry) thing;
-                        return (T) new ArgumentEntry(
-                                renameMethodsInThing(renames, argumentEntry.getBehaviorEntry()),
-                                argumentEntry.getIndex(),
-                                argumentEntry.getName()
+                } else if (thing instanceof LocalVariableEntry) {
+                        LocalVariableEntry variableEntry = (LocalVariableEntry) thing;
+                        return (T) new LocalVariableEntry(
+                                        renameMethodsInThing(renames, variableEntry.getOwnerEntry()),
+                                        variableEntry.getIndex(),
+                                        variableEntry.getName()
                         );
                 } else if (thing instanceof EntryReference) {
                         EntryReference<Entry, Entry> reference = (EntryReference<Entry, Entry>) thing;
@@ -119,27 +119,24 @@ public class EntryRenamer {
                 } else if (thing instanceof ClassEntry) {
                         ClassEntry classEntry = (ClassEntry) thing;
                         return (T) new ClassEntry(renameClassesInThing(renames, classEntry.getClassName()));
-                } else if (thing instanceof FieldEntry) {
-                        FieldEntry fieldEntry = (FieldEntry) thing;
-                        return (T) new FieldEntry(renameClassesInThing(renames, fieldEntry.getClassEntry()), fieldEntry.getName(), renameClassesInThing(renames, fieldEntry.getType()));
-                } else if (thing instanceof ConstructorEntry) {
-                        ConstructorEntry constructorEntry = (ConstructorEntry) thing;
-                        return (T) new ConstructorEntry(renameClassesInThing(renames, constructorEntry.getClassEntry()), renameClassesInThing(renames, constructorEntry.getSignature()));
-                } else if (thing instanceof MethodEntry) {
-                        MethodEntry methodEntry = (MethodEntry) thing;
-                        return (T) new MethodEntry(renameClassesInThing(renames, methodEntry.getClassEntry()), methodEntry.getName(), renameClassesInThing(renames, methodEntry.getSignature()));
-                } else if (thing instanceof ArgumentEntry) {
-                        ArgumentEntry argumentEntry = (ArgumentEntry) thing;
-                        return (T) new ArgumentEntry(renameClassesInThing(renames, argumentEntry.getBehaviorEntry()), argumentEntry.getIndex(), argumentEntry.getName());
+                } else if (thing instanceof FieldDefEntry) {
+                        FieldDefEntry fieldEntry = (FieldDefEntry) thing;
+                        return (T) new FieldDefEntry(renameClassesInThing(renames, fieldEntry.getOwnerClassEntry()), fieldEntry.getName(), renameClassesInThing(renames, fieldEntry.getDesc()), fieldEntry.getAccess());
+                } else if (thing instanceof MethodDefEntry) {
+                        MethodDefEntry methodEntry = (MethodDefEntry) thing;
+                        return (T) new MethodDefEntry(renameClassesInThing(renames, methodEntry.getOwnerClassEntry()), methodEntry.getName(), renameClassesInThing(renames, methodEntry.getDesc()), methodEntry.getAccess());
+                } else if (thing instanceof LocalVariableEntry) {
+                        LocalVariableEntry argumentEntry = (LocalVariableEntry) thing;
+                        return (T) new LocalVariableEntry(renameClassesInThing(renames, argumentEntry.getOwnerEntry()), argumentEntry.getIndex(), argumentEntry.getName());
                 } else if (thing instanceof EntryReference) {
                         EntryReference<Entry, Entry> reference = (EntryReference<Entry, Entry>) thing;
                         reference.entry = renameClassesInThing(renames, reference.entry);
                         reference.context = renameClassesInThing(renames, reference.context);
                         return thing;
-                } else if (thing instanceof Signature) {
-                        return (T) new Signature((Signature) thing, className -> renameClassesInThing(renames, className));
-                } else if (thing instanceof Type) {
-                        return (T) new Type((Type) thing, className -> renameClassesInThing(renames, className));
+                } else if (thing instanceof MethodDescriptor) {
+                        return (T) ((MethodDescriptor) thing).remap(className -> renameClassesInThing(renames, className));
+                } else if (thing instanceof TypeDescriptor) {
+                        return (T) ((TypeDescriptor) thing).remap(className -> renameClassesInThing(renames, className));
                 }
 
                 return thing;
diff --git a/src/main/java/cuchaz/enigma/analysis/FieldReferenceTreeNode.java b/src/main/java/cuchaz/enigma/analysis/FieldReferenceTreeNode.java
index 34d2eff..3e467db 100644
--- a/src/main/java/cuchaz/enigma/analysis/FieldReferenceTreeNode.java
+++ b/src/main/java/cuchaz/enigma/analysis/FieldReferenceTreeNode.java
@@ -11,17 +11,15 @@
 
 package cuchaz.enigma.analysis;
 
-import cuchaz.enigma.mapping.BehaviorEntry;
-import cuchaz.enigma.mapping.FieldEntry;
-import cuchaz.enigma.mapping.Translator;
+import cuchaz.enigma.mapping.*;
 
 import javax.swing.tree.DefaultMutableTreeNode;
 
-public class FieldReferenceTreeNode extends DefaultMutableTreeNode implements ReferenceTreeNode<FieldEntry, BehaviorEntry> {
+public class FieldReferenceTreeNode extends DefaultMutableTreeNode implements ReferenceTreeNode<FieldEntry, MethodDefEntry> {
 
         private Translator deobfuscatingTranslator;
         private FieldEntry entry;
-        private EntryReference<FieldEntry, BehaviorEntry> reference;
+        private EntryReference<FieldEntry, MethodDefEntry> reference;
         private Access access;
 
         public FieldReferenceTreeNode(Translator deobfuscatingTranslator, FieldEntry entry) {
@@ -30,7 +28,7 @@ public class FieldReferenceTreeNode extends DefaultMutableTreeNode implements Re
                 this.reference = null;
         }
 
-        private FieldReferenceTreeNode(Translator deobfuscatingTranslator, EntryReference<FieldEntry, BehaviorEntry> reference, Access access) {
+        private FieldReferenceTreeNode(Translator deobfuscatingTranslator, EntryReference<FieldEntry, MethodDefEntry> reference, Access access) {
                 this.deobfuscatingTranslator = deobfuscatingTranslator;
                 this.entry = reference.entry;
                 this.reference = reference;
@@ -43,34 +41,34 @@ public class FieldReferenceTreeNode extends DefaultMutableTreeNode implements Re
         }
 
         @Override
-        public EntryReference<FieldEntry, BehaviorEntry> getReference() {
+        public EntryReference<FieldEntry, MethodDefEntry> getReference() {
                 return this.reference;
         }
 
         @Override
         public String toString() {
                 if (this.reference != null) {
-                        return String.format("%s (%s)", this.deobfuscatingTranslator.translateEntry(this.reference.context), this.access);
+                        return String.format("%s (%s)", this.deobfuscatingTranslator.getTranslatedMethodDef(this.reference.context), this.access);
                 }
-                return this.deobfuscatingTranslator.translateEntry(this.entry).toString();
+                return deobfuscatingTranslator.getTranslatedField(entry).getName();
         }
 
         public void load(JarIndex index, boolean recurse) {
                 // get all the child nodes
                 if (this.reference == null) {
-                        for (EntryReference<FieldEntry, BehaviorEntry> reference : index.getFieldReferences(this.entry)) {
+                        for (EntryReference<FieldEntry, MethodDefEntry> reference : index.getFieldReferences(this.entry)) {
                                 add(new FieldReferenceTreeNode(this.deobfuscatingTranslator, reference, index.getAccess(this.entry)));
                         }
                 } else {
-                        for (EntryReference<BehaviorEntry, BehaviorEntry> reference : index.getBehaviorReferences(this.reference.context)) {
-                                add(new BehaviorReferenceTreeNode(this.deobfuscatingTranslator, reference, index.getAccess(this.reference.context)));
+                        for (EntryReference<MethodEntry, MethodDefEntry> reference : index.getMethodReferences(this.reference.context)) {
+                                add(new MethodReferenceTreeNode(this.deobfuscatingTranslator, reference, index.getAccess(this.reference.context)));
                         }
                 }
 
                 if (recurse && children != null) {
                         for (Object node : children) {
-                                if (node instanceof BehaviorReferenceTreeNode) {
-                                        ((BehaviorReferenceTreeNode) node).load(index, true);
+                                if (node instanceof MethodReferenceTreeNode) {
+                                        ((MethodReferenceTreeNode) node).load(index, true);
                                 } else if (node instanceof FieldReferenceTreeNode) {
                                         ((FieldReferenceTreeNode) node).load(index, true);
                                 }
diff --git a/src/main/java/cuchaz/enigma/analysis/IndexClassVisitor.java b/src/main/java/cuchaz/enigma/analysis/IndexClassVisitor.java
new file mode 100644
index 0000000..97d6ffa
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/analysis/IndexClassVisitor.java
@@ -0,0 +1,38 @@
+package cuchaz.enigma.analysis;
+
+import cuchaz.enigma.mapping.ClassDefEntry;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.FieldVisitor;
+import org.objectweb.asm.MethodVisitor;
+
+public class IndexClassVisitor extends ClassVisitor {
+        private final JarIndex index;
+        private ClassDefEntry classEntry;
+
+        public IndexClassVisitor(JarIndex index, int api) {
+                super(api);
+                this.index = index;
+        }
+
+        @Override
+        public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
+                this.classEntry = this.index.indexClass(access, name, superName, interfaces);
+                super.visit(version, access, name, signature, superName, interfaces);
+        }
+
+        @Override
+        public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
+                if (this.classEntry != null) {
+                        this.index.indexField(this.classEntry, access, name, desc);
+                }
+                return super.visitField(access, name, desc, signature, value);
+        }
+
+        @Override
+        public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
+                if (this.classEntry != null) {
+                        this.index.indexMethod(this.classEntry, access, name, desc);
+                }
+                return super.visitMethod(access, name, desc, signature, exceptions);
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/analysis/IndexInnerClassVisitor.java b/src/main/java/cuchaz/enigma/analysis/IndexInnerClassVisitor.java
new file mode 100644
index 0000000..621bd33
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/analysis/IndexInnerClassVisitor.java
@@ -0,0 +1,23 @@
+package cuchaz.enigma.analysis;
+
+import cuchaz.enigma.mapping.ClassEntry;
+import org.objectweb.asm.ClassVisitor;
+
+public class IndexInnerClassVisitor extends ClassVisitor {
+        private final JarIndex index;
+
+        public IndexInnerClassVisitor(JarIndex index, int api) {
+                super(api);
+                this.index = index;
+        }
+
+        @Override
+        public void visitInnerClass(String name, String outerName, String innerName, int access) {
+                ClassEntry entry = new ClassEntry(name);
+                // Ignore anonymous classes
+                if (innerName != null && outerName != null) {
+                        ClassEntry outerEntry = new ClassEntry(outerName);
+                        index.indexInnerClass(entry, outerEntry);
+                }
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/analysis/IndexReferenceVisitor.java b/src/main/java/cuchaz/enigma/analysis/IndexReferenceVisitor.java
new file mode 100644
index 0000000..552601b
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/analysis/IndexReferenceVisitor.java
@@ -0,0 +1,50 @@
+package cuchaz.enigma.analysis;
+
+import cuchaz.enigma.bytecode.AccessFlags;
+import cuchaz.enigma.mapping.*;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.MethodVisitor;
+
+public class IndexReferenceVisitor extends ClassVisitor {
+        private final JarIndex index;
+        private final ReferencedEntryPool entryPool;
+        private ClassEntry classEntry;
+
+        public IndexReferenceVisitor(JarIndex index, ReferencedEntryPool entryPool, int api) {
+                super(api);
+                this.index = index;
+                this.entryPool = entryPool;
+        }
+
+        @Override
+        public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
+                this.classEntry = new ClassEntry(name);
+        }
+
+        @Override
+        public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
+                MethodDefEntry entry = new MethodDefEntry(classEntry, name, new MethodDescriptor(desc), new AccessFlags(access));
+                return new Method(this.index, entry, this.api);
+        }
+
+        private class Method extends MethodVisitor {
+                private final JarIndex index;
+                private final MethodDefEntry callerEntry;
+
+                public Method(JarIndex index, MethodDefEntry callerEntry, int api) {
+                        super(api);
+                        this.index = index;
+                        this.callerEntry = callerEntry;
+                }
+
+                @Override
+                public void visitFieldInsn(int opcode, String owner, String name, String desc) {
+                        this.index.indexFieldAccess(callerEntry, owner, name, desc);
+                }
+
+                @Override
+                public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean itf) {
+                        this.index.indexMethodCall(callerEntry, owner, name, desc);
+                }
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/analysis/JarClassIterator.java b/src/main/java/cuchaz/enigma/analysis/JarClassIterator.java
deleted file mode 100644
index 87d3797..0000000
--- a/src/main/java/cuchaz/enigma/analysis/JarClassIterator.java
+++ /dev/null
@@ -1,123 +0,0 @@
-/*******************************************************************************
- * 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.analysis;
-
-import com.google.common.collect.Lists;
-import cuchaz.enigma.Constants;
-import cuchaz.enigma.mapping.ClassEntry;
-import javassist.ByteArrayClassPath;
-import javassist.ClassPool;
-import javassist.CtClass;
-import javassist.NotFoundException;
-import javassist.bytecode.Descriptor;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Enumeration;
-import java.util.Iterator;
-import java.util.List;
-import java.util.jar.JarEntry;
-import java.util.jar.JarFile;
-
-public class JarClassIterator implements Iterator<CtClass> {
-
-        private JarFile jar;
-        private Iterator<JarEntry> iter;
-
-        public JarClassIterator(JarFile jar) {
-                this.jar = jar;
-
-                // get the jar entries that correspond to classes
-                List<JarEntry> classEntries = Lists.newArrayList();
-                Enumeration<JarEntry> entries = this.jar.entries();
-                while (entries.hasMoreElements()) {
-                        JarEntry entry = entries.nextElement();
-
-                        // is this a class file?
-                        if (entry.getName().endsWith(".class")) {
-                                classEntries.add(entry);
-                        }
-                }
-                this.iter = classEntries.iterator();
-        }
-
-        public static List<ClassEntry> getClassEntries(JarFile jar) {
-                List<ClassEntry> classEntries = Lists.newArrayList();
-                Enumeration<JarEntry> entries = jar.entries();
-                while (entries.hasMoreElements()) {
-                        JarEntry entry = entries.nextElement();
-
-                        // is this a class file?
-                        if (!entry.isDirectory() && entry.getName().endsWith(".class")) {
-                                classEntries.add(getClassEntry(entry));
-                        }
-                }
-                return classEntries;
-        }
-
-        public static Iterable<CtClass> classes(final JarFile jar) {
-                return () -> new JarClassIterator(jar);
-        }
-
-        private static CtClass getClass(JarFile jar, JarEntry entry) throws IOException, NotFoundException {
-                // read the class into a buffer
-                ByteArrayOutputStream bos = new ByteArrayOutputStream();
-                byte[] buf = new byte[Constants.KiB];
-                int totalNumBytesRead = 0;
-                InputStream in = jar.getInputStream(entry);
-                while (in.available() > 0) {
-                        int numBytesRead = in.read(buf);
-                        if (numBytesRead < 0) {
-                                break;
-                        }
-                        bos.write(buf, 0, numBytesRead);
-
-                        // sanity checking
-                        totalNumBytesRead += numBytesRead;
-                        if (totalNumBytesRead > Constants.MiB) {
-                                throw new Error("Class file " + entry.getName() + " larger than 1 MiB! Something is wrong!");
-                        }
-                }
-
-                // get a javassist handle for the class
-                String className = Descriptor.toJavaName(getClassEntry(entry).getName());
-                ClassPool classPool = new ClassPool();
-                classPool.appendSystemPath();
-                classPool.insertClassPath(new ByteArrayClassPath(className, bos.toByteArray()));
-                return classPool.get(className);
-        }
-
-        private static ClassEntry getClassEntry(JarEntry entry) {
-                return new ClassEntry(entry.getName().substring(0, entry.getName().length() - ".class".length()));
-        }
-
-        @Override
-        public boolean hasNext() {
-                return this.iter.hasNext();
-        }
-
-        @Override
-        public CtClass next() {
-                JarEntry entry = this.iter.next();
-                try {
-                        return getClass(this.jar, entry);
-                } catch (IOException | NotFoundException ex) {
-                        throw new Error("Unable to load class: " + entry.getName());
-                }
-        }
-
-        @Override
-        public void remove() {
-                throw new UnsupportedOperationException();
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/analysis/JarIndex.java b/src/main/java/cuchaz/enigma/analysis/JarIndex.java
index d0d0f2c..972d4fe 100644
--- a/src/main/java/cuchaz/enigma/analysis/JarIndex.java
+++ b/src/main/java/cuchaz/enigma/analysis/JarIndex.java
@@ -12,113 +12,68 @@
 package cuchaz.enigma.analysis;
 
 import com.google.common.collect.*;
+import cuchaz.enigma.bytecode.AccessFlags;
 import cuchaz.enigma.mapping.*;
-import cuchaz.enigma.mapping.Translator;
-import javassist.*;
-import javassist.bytecode.*;
-import javassist.expr.*;
+import org.objectweb.asm.Opcodes;
 
-import java.lang.reflect.Modifier;
 import java.util.*;
-import java.util.jar.JarFile;
 
 public class JarIndex {
 
+        private final ReferencedEntryPool entryPool;
+
         private Set<ClassEntry> obfClassEntries;
         private TranslationIndex translationIndex;
         private Map<Entry, Access> access;
-        private Multimap<ClassEntry, FieldEntry> fields;
-        private Multimap<ClassEntry, BehaviorEntry> behaviors;
-        private Multimap<String, MethodEntry> methodImplementations;
-        private Multimap<BehaviorEntry, EntryReference<BehaviorEntry, BehaviorEntry>> behaviorReferences;
-        private Multimap<FieldEntry, EntryReference<FieldEntry, BehaviorEntry>> fieldReferences;
+        private Multimap<ClassEntry, FieldDefEntry> fields;
+        private Multimap<ClassEntry, MethodDefEntry> methods;
+        private Multimap<String, MethodDefEntry> methodImplementations;
+        private Multimap<MethodEntry, EntryReference<MethodEntry, MethodDefEntry>> methodReferences;
+        private Multimap<FieldEntry, EntryReference<FieldEntry, MethodDefEntry>> fieldReferences;
         private Multimap<ClassEntry, ClassEntry> innerClassesByOuter;
         private Map<ClassEntry, ClassEntry> outerClassesByInner;
-        private Map<ClassEntry, BehaviorEntry> anonymousClasses;
         private Map<MethodEntry, MethodEntry> bridgedMethods;
         private Set<MethodEntry> syntheticMethods;
 
-        public JarIndex() {
+        public JarIndex(ReferencedEntryPool entryPool) {
+                this.entryPool = entryPool;
                 this.obfClassEntries = Sets.newHashSet();
-                this.translationIndex = new TranslationIndex();
+                this.translationIndex = new TranslationIndex(entryPool);
                 this.access = Maps.newHashMap();
                 this.fields = HashMultimap.create();
-                this.behaviors = HashMultimap.create();
+                this.methods = HashMultimap.create();
                 this.methodImplementations = HashMultimap.create();
-                this.behaviorReferences = HashMultimap.create();
+                this.methodReferences = HashMultimap.create();
                 this.fieldReferences = HashMultimap.create();
                 this.innerClassesByOuter = HashMultimap.create();
                 this.outerClassesByInner = Maps.newHashMap();
-                this.anonymousClasses = Maps.newHashMap();
                 this.bridgedMethods = Maps.newHashMap();
                 this.syntheticMethods = Sets.newHashSet();
         }
 
-        public void indexJar(JarFile jar, boolean buildInnerClasses) {
+        public void indexJar(ParsedJar jar, boolean buildInnerClasses) {
 
                 // step 1: read the class names
-                this.obfClassEntries.addAll(JarClassIterator.getClassEntries(jar));
-
-                // step 2: index field/method/constructor access
-                for (CtClass c : JarClassIterator.classes(jar)) {
-                        for (CtField field : c.getDeclaredFields()) {
-                                FieldEntry fieldEntry = EntryFactory.getFieldEntry(field);
-                                this.access.put(fieldEntry, Access.get(field));
-                                this.fields.put(fieldEntry.getClassEntry(), fieldEntry);
-                        }
-                        for (CtBehavior behavior : c.getDeclaredBehaviors()) {
-                                BehaviorEntry behaviorEntry = EntryFactory.getBehaviorEntry(behavior);
-                                this.access.put(behaviorEntry, Access.get(behavior));
-                                this.behaviors.put(behaviorEntry.getClassEntry(), behaviorEntry);
-                        }
-                }
+                obfClassEntries.addAll(jar.getClassEntries());
 
-                // step 3: index extends, implements, fields, and methods
-                for (CtClass c : JarClassIterator.classes(jar)) {
-                        this.translationIndex.indexClass(c);
-                        String className = Descriptor.toJvmName(c.getName());
-                        for (String interfaceName : c.getClassFile().getInterfaces()) {
-                                className = Descriptor.toJvmName(className);
-                                interfaceName = Descriptor.toJvmName(interfaceName);
-                                if (className.equals(interfaceName)) {
-                                        throw new IllegalArgumentException("Class cannot be its own interface! " + className);
-                                }
-                        }
-                        for (CtBehavior behavior : c.getDeclaredBehaviors()) {
-                                indexBehavior(behavior);
-                        }
-                }
+                // step 2: index classes, fields, methods, interfaces
+                jar.visit(node -> node.accept(new IndexClassVisitor(this, Opcodes.ASM5)));
 
-                // step 4: index field, method, constructor references
-                for (CtClass c : JarClassIterator.classes(jar)) {
-                        for (CtBehavior behavior : c.getDeclaredBehaviors()) {
-                                indexBehaviorReferences(behavior);
+                // step 3: index field, method, constructor references
+                jar.visit(node -> node.accept(new IndexReferenceVisitor(this, entryPool, Opcodes.ASM5)));
+
+                // step 4: index bridged methods
+                for (MethodDefEntry methodEntry : methods.values()) {
+                        // look for bridge and bridged methods
+                        MethodEntry bridgedMethod = findBridgedMethod(methodEntry);
+                        if (bridgedMethod != null) {
+                                this.bridgedMethods.put(methodEntry, bridgedMethod);
                         }
                 }
 
                 if (buildInnerClasses) {
-
                         // step 5: index inner classes and anonymous classes
-                        for (CtClass c : JarClassIterator.classes(jar)) {
-                                ClassEntry innerClassEntry = EntryFactory.getClassEntry(c);
-                                ClassEntry outerClassEntry = findOuterClass(c);
-                                if (outerClassEntry != null) {
-                                        this.innerClassesByOuter.put(outerClassEntry, innerClassEntry);
-                                        boolean innerWasAdded = this.outerClassesByInner.put(innerClassEntry, outerClassEntry) == null;
-                                        assert (innerWasAdded);
-
-                                        BehaviorEntry enclosingBehavior = isAnonymousClass(c, outerClassEntry);
-                                        if (enclosingBehavior != null) {
-                                                this.anonymousClasses.put(innerClassEntry, enclosingBehavior);
-
-                                                // DEBUG
-                                                //System.out.println("ANONYMOUS: " + outerClassEntry.getName() + "$" + innerClassEntry.getSimpleName());
-                                        }/* else {
-                                // DEBUG
-                        //System.out.println("INNER: " + outerClassEntry.getName() + "$" + innerClassEntry.getSimpleName());
-                    }*/
-                                }
-                        }
+                        jar.visit(node -> node.accept(new IndexInnerClassVisitor(this, Opcodes.ASM5)));
 
                         // step 6: update other indices with inner class info
                         Map<String, String> renames = Maps.newHashMap();
@@ -133,385 +88,109 @@ public class JarIndex {
                         EntryRenamer.renameClassesInSet(renames, this.obfClassEntries);
                         this.translationIndex.renameClasses(renames);
                         EntryRenamer.renameClassesInMultimap(renames, this.methodImplementations);
-                        EntryRenamer.renameClassesInMultimap(renames, this.behaviorReferences);
+                        EntryRenamer.renameClassesInMultimap(renames, this.methodReferences);
                         EntryRenamer.renameClassesInMultimap(renames, this.fieldReferences);
                         EntryRenamer.renameClassesInMap(renames, this.access);
                 }
         }
 
-        private void indexBehavior(CtBehavior behavior) {
-                // get the behavior entry
-                final BehaviorEntry behaviorEntry = EntryFactory.getBehaviorEntry(behavior);
-                if (behaviorEntry instanceof MethodEntry) {
-                        MethodEntry methodEntry = (MethodEntry) behaviorEntry;
-
-                        // is synthetic
-                        if ((behavior.getModifiers() & AccessFlag.SYNTHETIC) != 0) {
-                                syntheticMethods.add(methodEntry);
-                        }
-
-                        // index implementation
-                        this.methodImplementations.put(behaviorEntry.getClassName(), methodEntry);
-
-                        // look for bridge and bridged methods
-                        CtMethod bridgedMethod = getBridgedMethod((CtMethod) behavior);
-                        if (bridgedMethod != null) {
-                                this.bridgedMethods.put(methodEntry, EntryFactory.getMethodEntry(bridgedMethod));
+        protected ClassDefEntry indexClass(int access, String name, String superName, String[] interfaces) {
+                for (String interfaceName : interfaces) {
+                        if (name.equals(interfaceName)) {
+                                throw new IllegalArgumentException("Class cannot be its own interface! " + name);
                         }
                 }
-                // looks like we don't care about constructors here
-        }
-
-        private void indexBehaviorReferences(CtBehavior behavior) {
-                // index method calls
-                final BehaviorEntry behaviorEntry = EntryFactory.getBehaviorEntry(behavior);
-                try {
-                        behavior.instrument(new ExprEditor() {
-                                @Override
-                                public void edit(MethodCall call) {
-                                        MethodEntry calledMethodEntry = EntryFactory.getMethodEntry(call);
-                                        ClassEntry resolvedClassEntry = translationIndex.resolveEntryClass(calledMethodEntry);
-                                        if (resolvedClassEntry != null && !resolvedClassEntry.equals(calledMethodEntry.getClassEntry())) {
-                                                calledMethodEntry = new MethodEntry(
-                                                        resolvedClassEntry,
-                                                        calledMethodEntry.getName(),
-                                                        calledMethodEntry.getSignature()
-                                                );
-                                        }
-                                        EntryReference<BehaviorEntry, BehaviorEntry> reference = new EntryReference<>(
-                                                calledMethodEntry,
-                                                call.getMethodName(),
-                                                behaviorEntry
-                                        );
-                                        behaviorReferences.put(calledMethodEntry, reference);
-                                }
-
-                                @Override
-                                public void edit(FieldAccess call) {
-                                        FieldEntry calledFieldEntry = EntryFactory.getFieldEntry(call);
-                                        ClassEntry resolvedClassEntry = translationIndex.resolveEntryClass(calledFieldEntry);
-                                        if (resolvedClassEntry != null && !resolvedClassEntry.equals(calledFieldEntry.getClassEntry())) {
-                                                calledFieldEntry = new FieldEntry(calledFieldEntry, resolvedClassEntry);
-                                        }
-                                        EntryReference<FieldEntry, BehaviorEntry> reference = new EntryReference<>(
-                                                calledFieldEntry,
-                                                call.getFieldName(),
-                                                behaviorEntry
-                                        );
-                                        fieldReferences.put(calledFieldEntry, reference);
-                                }
-
-                                @Override
-                                public void edit(ConstructorCall call) {
-                                        ConstructorEntry calledConstructorEntry = EntryFactory.getConstructorEntry(call);
-                                        EntryReference<BehaviorEntry, BehaviorEntry> reference = new EntryReference<>(
-                                                calledConstructorEntry,
-                                                call.getMethodName(),
-                                                behaviorEntry
-                                        );
-                                        behaviorReferences.put(calledConstructorEntry, reference);
-                                }
-
-                                @Override
-                                public void edit(NewExpr call) {
-                                        ConstructorEntry calledConstructorEntry = EntryFactory.getConstructorEntry(call);
-                                        EntryReference<BehaviorEntry, BehaviorEntry> reference = new EntryReference<>(
-                                                calledConstructorEntry,
-                                                call.getClassName(),
-                                                behaviorEntry
-                                        );
-                                        behaviorReferences.put(calledConstructorEntry, reference);
-                                }
-                        });
-                } catch (CannotCompileException ex) {
-                        throw new Error(ex);
-                }
+                return this.translationIndex.indexClass(access, name, superName, interfaces);
         }
 
-        private CtMethod getBridgedMethod(CtMethod method) {
-
-                // bridge methods just call another method, cast it to the return type, and return the result
-                // let's see if we can detect this scenario
-
-                // skip non-synthetic methods
-                if ((method.getModifiers() & AccessFlag.SYNTHETIC) == 0) {
-                        return null;
-                }
-
-                // get all the called methods
-                final List<MethodCall> methodCalls = Lists.newArrayList();
-                try {
-                        method.instrument(new ExprEditor() {
-                                @Override
-                                public void edit(MethodCall call) {
-                                        methodCalls.add(call);
-                                }
-                        });
-                } catch (CannotCompileException ex) {
-                        // this is stupid... we're not even compiling anything
-                        throw new Error(ex);
-                }
-
-                // is there just one?
-                if (methodCalls.size() != 1) {
-                        return null;
-                }
-                MethodCall call = methodCalls.get(0);
-
-                try {
-                        // we have a bridge method!
-                        return call.getMethod();
-                } catch (NotFoundException ex) {
-                        // can't find the type? not a bridge method
-                        return null;
-                }
+        protected void indexField(ClassDefEntry owner, int access, String name, String desc) {
+                FieldDefEntry fieldEntry = new FieldDefEntry(owner, name, new TypeDescriptor(desc), new AccessFlags(access));
+                this.translationIndex.indexField(fieldEntry);
+                this.access.put(fieldEntry, Access.get(access));
+                this.fields.put(fieldEntry.getOwnerClassEntry(), fieldEntry);
         }
 
-        private ClassEntry findOuterClass(CtClass c) {
-
-                ClassEntry classEntry = EntryFactory.getClassEntry(c);
+        protected void indexMethod(ClassDefEntry owner, int access, String name, String desc) {
+                MethodDefEntry methodEntry = new MethodDefEntry(owner, name, new MethodDescriptor(desc), new AccessFlags(access));
+                this.translationIndex.indexMethod(methodEntry);
+                this.access.put(methodEntry, Access.get(access));
+                this.methods.put(methodEntry.getOwnerClassEntry(), methodEntry);
 
-                // does this class already have an outer class?
-                if (classEntry.isInnerClass()) {
-                        return classEntry.getOuterClassEntry();
+                if (new AccessFlags(access).isSynthetic()) {
+                        syntheticMethods.add(methodEntry);
                 }
 
-                // inner classes:
-                // have constructors that can (illegally) set synthetic fields
-                // the outer class is the only class that calls constructors
-
-                // use the synthetic fields to find the synthetic constructors
-                for (CtConstructor constructor : c.getDeclaredConstructors()) {
-                        Set<String> syntheticFieldTypes = Sets.newHashSet();
-                        if (!isIllegalConstructor(syntheticFieldTypes, constructor)) {
-                                continue;
-                        }
-
-                        ConstructorEntry constructorEntry = EntryFactory.getConstructorEntry(constructor);
-
-                        // gather the classes from the illegally-set synthetic fields
-                        Set<ClassEntry> illegallySetClasses = Sets.newHashSet();
-                        for (String type : syntheticFieldTypes) {
-                                if (type.startsWith("L")) {
-                                        ClassEntry outerClassEntry = new ClassEntry(type.substring(1, type.length() - 1));
-                                        if (isSaneOuterClass(outerClassEntry, classEntry)) {
-                                                illegallySetClasses.add(outerClassEntry);
-                                        }
-                                }
-                        }
-
-                        // who calls this constructor?
-                        Set<ClassEntry> callerClasses = Sets.newHashSet();
-                        for (EntryReference<BehaviorEntry, BehaviorEntry> reference : getBehaviorReferences(constructorEntry)) {
-
-                                // make sure it's not a call to super
-                                if (reference.entry instanceof ConstructorEntry && reference.context instanceof ConstructorEntry) {
-
-                                        // is the entry a superclass of the context?
-                                        ClassEntry calledClassEntry = reference.entry.getClassEntry();
-                                        ClassEntry superclassEntry = this.translationIndex.getSuperclass(reference.context.getClassEntry());
-                                        if (superclassEntry != null && superclassEntry.equals(calledClassEntry)) {
-                                                // it's a super call, skip
-                                                continue;
-                                        }
-                                }
-
-                                if (isSaneOuterClass(reference.context.getClassEntry(), classEntry)) {
-                                        callerClasses.add(reference.context.getClassEntry());
-                                }
-                        }
-
-                        // do we have an answer yet?
-                        if (callerClasses.isEmpty()) {
-                                if (illegallySetClasses.size() == 1) {
-                                        return illegallySetClasses.iterator().next();
-                                } else {
-                                        System.out.println(String.format("WARNING: Unable to find outer class for %s. No caller and no illegally set field classes.", classEntry));
-                                }
-                        } else {
-                                if (callerClasses.size() == 1) {
-                                        return callerClasses.iterator().next();
-                                } else {
-                                        // multiple callers, do the illegally set classes narrow it down?
-                                        Set<ClassEntry> intersection = Sets.newHashSet(callerClasses);
-                                        intersection.retainAll(illegallySetClasses);
-                                        if (intersection.size() == 1) {
-                                                return intersection.iterator().next();
-                                        } else {
-                                                System.out.println(String.format("WARNING: Unable to choose outer class for %s among options: %s", classEntry, callerClasses));
-                                        }
-                                }
-                        }
+                // we don't care about constructors here
+                if (!methodEntry.isConstructor()) {
+                        // index implementation
+                        this.methodImplementations.put(methodEntry.getClassName(), methodEntry);
                 }
-
-                return null;
         }
 
-        private boolean isSaneOuterClass(ClassEntry outerClassEntry, ClassEntry innerClassEntry) {
-
-                // clearly this would be silly
-                if (outerClassEntry.equals(innerClassEntry)) {
-                        return false;
+        protected void indexMethodCall(MethodDefEntry callerEntry, String owner, String name, String desc) {
+                MethodEntry referencedMethod = new MethodEntry(entryPool.getClass(owner), name, new MethodDescriptor(desc));
+                ClassEntry resolvedClassEntry = translationIndex.resolveEntryOwner(referencedMethod);
+                if (resolvedClassEntry != null && !resolvedClassEntry.equals(referencedMethod.getOwnerClassEntry())) {
+                        referencedMethod = referencedMethod.updateOwnership(resolvedClassEntry);
                 }
-
-                // is the outer class in the jar?
-                return this.obfClassEntries.contains(outerClassEntry);
-
+                methodReferences.put(referencedMethod, new EntryReference<>(referencedMethod, referencedMethod.getName(), callerEntry));
         }
 
-        @SuppressWarnings("unchecked")
-        private boolean isIllegalConstructor(Set<String> syntheticFieldTypes, CtConstructor constructor) {
-
-                // illegal constructors only set synthetic member fields, then call super()
-                String className = constructor.getDeclaringClass().getName();
-
-                // collect all the field accesses, constructor calls, and method calls
-                final List<FieldAccess> illegalFieldWrites = Lists.newArrayList();
-                final List<ConstructorCall> constructorCalls = Lists.newArrayList();
-                try {
-                        constructor.instrument(new ExprEditor() {
-                                @Override
-                                public void edit(FieldAccess fieldAccess) {
-                                        if (fieldAccess.isWriter() && constructorCalls.isEmpty()) {
-                                                illegalFieldWrites.add(fieldAccess);
-                                        }
-                                }
-
-                                @Override
-                                public void edit(ConstructorCall constructorCall) {
-                                        constructorCalls.add(constructorCall);
-                                }
-                        });
-                } catch (CannotCompileException ex) {
-                        // we're not compiling anything... this is stupid
-                        throw new Error(ex);
-                }
-
-                // are there any illegal field writes?
-                if (illegalFieldWrites.isEmpty()) {
-                        return false;
-                }
-
-                // are all the writes to synthetic fields?
-                for (FieldAccess fieldWrite : illegalFieldWrites) {
-
-                        // all illegal writes have to be to the local class
-                        if (!fieldWrite.getClassName().equals(className)) {
-                                System.err.println(String.format("WARNING: illegal write to non-member field %s.%s", fieldWrite.getClassName(), fieldWrite.getFieldName()));
-                                return false;
-                        }
-
-                        // find the field
-                        FieldInfo fieldInfo = null;
-                        for (FieldInfo info : (List<FieldInfo>) constructor.getDeclaringClass().getClassFile().getFields()) {
-                                if (info.getName().equals(fieldWrite.getFieldName()) && info.getDescriptor().equals(fieldWrite.getSignature())) {
-                                        fieldInfo = info;
-                                        break;
-                                }
-                        }
-                        if (fieldInfo == null) {
-                                // field is in a superclass or something, can't be a local synthetic member
-                                return false;
-                        }
-
-                        // is this field synthetic?
-                        boolean isSynthetic = (fieldInfo.getAccessFlags() & AccessFlag.SYNTHETIC) != 0;
-                        if (isSynthetic) {
-                                syntheticFieldTypes.add(fieldInfo.getDescriptor());
-                        } else {
-                                System.err.println(String.format("WARNING: illegal write to non synthetic field %s %s.%s", fieldInfo.getDescriptor(), className, fieldInfo.getName()));
-                                return false;
-                        }
+        protected void indexFieldAccess(MethodDefEntry callerEntry, String owner, String name, String desc) {
+                FieldEntry referencedField = new FieldEntry(entryPool.getClass(owner), name, new TypeDescriptor(desc));
+                ClassEntry resolvedClassEntry = translationIndex.resolveEntryOwner(referencedField);
+                if (resolvedClassEntry != null && !resolvedClassEntry.equals(referencedField.getOwnerClassEntry())) {
+                        referencedField = referencedField.updateOwnership(resolvedClassEntry);
                 }
-
-                // we passed all the tests!
-                return true;
+                fieldReferences.put(referencedField, new EntryReference<>(referencedField, referencedField.getName(), callerEntry));
         }
 
-        private BehaviorEntry isAnonymousClass(CtClass c, ClassEntry outerClassEntry) {
-
-                // is this class already marked anonymous?
-                EnclosingMethodAttribute enclosingMethodAttribute = (EnclosingMethodAttribute) c.getClassFile().getAttribute(EnclosingMethodAttribute.tag);
-                if (enclosingMethodAttribute != null) {
-                        if (enclosingMethodAttribute.methodIndex() > 0) {
-                                return EntryFactory.getBehaviorEntry(
-                                        Descriptor.toJvmName(enclosingMethodAttribute.className()),
-                                        enclosingMethodAttribute.methodName(),
-                                        enclosingMethodAttribute.methodDescriptor()
-                                );
-                        } else {
-                                // an attribute but no method? assume not anonymous
-                                return null;
-                        }
-                }
-
-                // if there's an inner class attribute, but not an enclosing method attribute, then it's not anonymous
-                InnerClassesAttribute innerClassesAttribute = (InnerClassesAttribute) c.getClassFile().getAttribute(InnerClassesAttribute.tag);
-                if (innerClassesAttribute != null) {
-                        return null;
-                }
+        public void indexInnerClass(ClassEntry innerEntry, ClassEntry outerEntry) {
+                this.innerClassesByOuter.put(outerEntry, innerEntry);
+                boolean innerWasAdded = this.outerClassesByInner.put(innerEntry, outerEntry) == null;
+                assert (innerWasAdded);
+        }
 
-                ClassEntry innerClassEntry = new ClassEntry(Descriptor.toJvmName(c.getName()));
+        private MethodEntry findBridgedMethod(MethodDefEntry method) {
 
-                // anonymous classes:
-                // can't be abstract
-                // have only one constructor
-                // it's called exactly once by the outer class
-                // the type the instance is assigned to can't be this type
+                // bridge methods just call another method, cast it to the return desc, and return the result
+                // let's see if we can detect this scenario
 
-                // is abstract?
-                if (Modifier.isAbstract(c.getModifiers())) {
+                // skip non-synthetic methods
+                if (!method.getAccess().isSynthetic()) {
                         return null;
                 }
 
-                // is there exactly one constructor?
-                if (c.getDeclaredConstructors().length != 1) {
-                        return null;
-                }
-                CtConstructor constructor = c.getDeclaredConstructors()[0];
+                // get all the called methods
+                final Collection<EntryReference<MethodEntry, MethodDefEntry>> referencedMethods = methodReferences.get(method);
 
-                // is this constructor called exactly once?
-                ConstructorEntry constructorEntry = EntryFactory.getConstructorEntry(constructor);
-                Collection<EntryReference<BehaviorEntry, BehaviorEntry>> references = getBehaviorReferences(constructorEntry);
-                if (references.size() != 1) {
+                // is there just one?
+                if (referencedMethods.size() != 1) {
                         return null;
                 }
 
-                // does the caller use this type?
-                BehaviorEntry caller = references.iterator().next().context;
-                for (FieldEntry fieldEntry : getReferencedFields(caller)) {
-                        if (fieldEntry.getType().hasClass() && fieldEntry.getType().getClassEntry().equals(innerClassEntry)) {
-                                // caller references this type, so it can't be anonymous
-                                return null;
-                        }
-                }
-                for (BehaviorEntry behaviorEntry : getReferencedBehaviors(caller)) {
-                        if (behaviorEntry.getSignature().hasClass(innerClassEntry)) {
-                                return null;
-                        }
-                }
-
-                return caller;
+                // we have a bridge method!
+                return referencedMethods.stream().findFirst().get().entry;
         }
 
         public Set<ClassEntry> getObfClassEntries() {
                 return this.obfClassEntries;
         }
 
-        public Collection<FieldEntry> getObfFieldEntries() {
+        public Collection<FieldDefEntry> getObfFieldEntries() {
                 return this.fields.values();
         }
 
-        public Collection<FieldEntry> getObfFieldEntries(ClassEntry classEntry) {
+        public Collection<FieldDefEntry> getObfFieldEntries(ClassEntry classEntry) {
                 return this.fields.get(classEntry);
         }
 
-        public Collection<BehaviorEntry> getObfBehaviorEntries() {
-                return this.behaviors.values();
+        public Collection<MethodDefEntry> getObfBehaviorEntries() {
+                return this.methods.values();
         }
 
-        public Collection<BehaviorEntry> getObfBehaviorEntries(ClassEntry classEntry) {
-                return this.behaviors.get(classEntry);
+        public Collection<MethodDefEntry> getObfBehaviorEntries(ClassEntry classEntry) {
+                return this.methods.get(classEntry);
         }
 
         public TranslationIndex getTranslationIndex() {
@@ -533,8 +212,8 @@ public class JarIndex {
                         }
                 }
                 ClassInheritanceTreeNode rootNode = new ClassInheritanceTreeNode(
-                        deobfuscatingTranslator,
-                        ancestry.get(ancestry.size() - 1)
+                                deobfuscatingTranslator,
+                                ancestry.get(ancestry.size() - 1)
                 );
 
                 // expand all children recursively
@@ -557,28 +236,20 @@ public class JarIndex {
         public MethodInheritanceTreeNode getMethodInheritance(Translator deobfuscatingTranslator, MethodEntry obfMethodEntry) {
 
                 // travel to the ancestor implementation
-                ClassEntry baseImplementationClassEntry = obfMethodEntry.getClassEntry();
-                for (ClassEntry ancestorClassEntry : this.translationIndex.getAncestry(obfMethodEntry.getClassEntry())) {
-                        MethodEntry ancestorMethodEntry = new MethodEntry(
-                                new ClassEntry(ancestorClassEntry),
-                                obfMethodEntry.getName(),
-                                obfMethodEntry.getSignature()
-                        );
-                        if (containsObfBehavior(ancestorMethodEntry)) {
+                ClassEntry baseImplementationClassEntry = obfMethodEntry.getOwnerClassEntry();
+                for (ClassEntry ancestorClassEntry : this.translationIndex.getAncestry(obfMethodEntry.getOwnerClassEntry())) {
+                        MethodEntry ancestorMethodEntry = entryPool.getMethod(ancestorClassEntry, obfMethodEntry.getName(), obfMethodEntry.getDesc().toString());
+                        if (ancestorMethodEntry != null && containsObfMethod(ancestorMethodEntry)) {
                                 baseImplementationClassEntry = ancestorClassEntry;
                         }
                 }
 
                 // make a root node at the base
-                MethodEntry methodEntry = new MethodEntry(
-                        baseImplementationClassEntry,
-                        obfMethodEntry.getName(),
-                        obfMethodEntry.getSignature()
-                );
+                MethodEntry methodEntry = entryPool.getMethod(baseImplementationClassEntry, obfMethodEntry.getName(), obfMethodEntry.getDesc().toString());
                 MethodInheritanceTreeNode rootNode = new MethodInheritanceTreeNode(
-                        deobfuscatingTranslator,
-                        methodEntry,
-                        containsObfBehavior(methodEntry)
+                                deobfuscatingTranslator,
+                                methodEntry,
+                                containsObfMethod(methodEntry)
                 );
 
                 // expand the full tree
@@ -599,12 +270,8 @@ public class JarIndex {
                         for (ClassEntry interfaceEntry : getInterfaces(obfMethodEntry.getClassName())) {
 
                                 // is this method defined in this interface?
-                                MethodEntry methodInterface = new MethodEntry(
-                                        interfaceEntry,
-                                        obfMethodEntry.getName(),
-                                        obfMethodEntry.getSignature()
-                                );
-                                if (containsObfBehavior(methodInterface)) {
+                                MethodEntry methodInterface = entryPool.getMethod(interfaceEntry, obfMethodEntry.getName(), obfMethodEntry.getDesc().toString());
+                                if (methodInterface != null && containsObfMethod(methodInterface)) {
                                         interfaceMethodEntries.add(methodInterface);
                                 }
                         }
@@ -623,14 +290,14 @@ public class JarIndex {
 
         public Set<MethodEntry> getRelatedMethodImplementations(MethodEntry obfMethodEntry) {
                 Set<MethodEntry> methodEntries = Sets.newHashSet();
-                getRelatedMethodImplementations(methodEntries, getMethodInheritance(new Translator(), obfMethodEntry));
+                getRelatedMethodImplementations(methodEntries, getMethodInheritance(new DirectionalTranslator(entryPool), obfMethodEntry));
                 return methodEntries;
         }
 
         private void getRelatedMethodImplementations(Set<MethodEntry> methodEntries, MethodInheritanceTreeNode node) {
                 MethodEntry methodEntry = node.getMethodEntry();
 
-                if (containsObfBehavior(methodEntry)) {
+                if (containsObfMethod(methodEntry)) {
                         // collect the entry
                         methodEntries.add(methodEntry);
                 }
@@ -643,7 +310,7 @@ public class JarIndex {
                 }
 
                 // look at interface methods too
-                for (MethodImplementationsTreeNode implementationsNode : getMethodImplementations(new Translator(), methodEntry)) {
+                for (MethodImplementationsTreeNode implementationsNode : getMethodImplementations(new DirectionalTranslator(entryPool), methodEntry)) {
                         getRelatedMethodImplementations(methodEntries, implementationsNode);
                 }
 
@@ -655,7 +322,7 @@ public class JarIndex {
 
         private void getRelatedMethodImplementations(Set<MethodEntry> methodEntries, MethodImplementationsTreeNode node) {
                 MethodEntry methodEntry = node.getMethodEntry();
-                if (containsObfBehavior(methodEntry)) {
+                if (containsObfMethod(methodEntry)) {
                         // collect the entry
                         methodEntries.add(methodEntry);
                 }
@@ -673,30 +340,30 @@ public class JarIndex {
                 }
         }
 
-        public Collection<EntryReference<FieldEntry, BehaviorEntry>> getFieldReferences(FieldEntry fieldEntry) {
+        public Collection<EntryReference<FieldEntry, MethodDefEntry>> getFieldReferences(FieldEntry fieldEntry) {
                 return this.fieldReferences.get(fieldEntry);
         }
 
-        public Collection<FieldEntry> getReferencedFields(BehaviorEntry behaviorEntry) {
+        public Collection<FieldEntry> getReferencedFields(MethodDefEntry methodEntry) {
                 // linear search is fast enough for now
                 Set<FieldEntry> fieldEntries = Sets.newHashSet();
-                for (EntryReference<FieldEntry, BehaviorEntry> reference : this.fieldReferences.values()) {
-                        if (reference.context == behaviorEntry) {
+                for (EntryReference<FieldEntry, MethodDefEntry> reference : this.fieldReferences.values()) {
+                        if (reference.context == methodEntry) {
                                 fieldEntries.add(reference.entry);
                         }
                 }
                 return fieldEntries;
         }
 
-        public Collection<EntryReference<BehaviorEntry, BehaviorEntry>> getBehaviorReferences(BehaviorEntry behaviorEntry) {
-                return this.behaviorReferences.get(behaviorEntry);
+        public Collection<EntryReference<MethodEntry, MethodDefEntry>> getMethodReferences(MethodEntry methodEntry) {
+                return this.methodReferences.get(methodEntry);
         }
 
-        public Collection<BehaviorEntry> getReferencedBehaviors(BehaviorEntry behaviorEntry) {
+        public Collection<MethodEntry> getReferencedMethods(MethodDefEntry methodEntry) {
                 // linear search is fast enough for now
-                Set<BehaviorEntry> behaviorEntries = Sets.newHashSet();
-                for (EntryReference<BehaviorEntry, BehaviorEntry> reference : this.behaviorReferences.values()) {
-                        if (reference.context == behaviorEntry) {
+                Set<MethodEntry> behaviorEntries = Sets.newHashSet();
+                for (EntryReference<MethodEntry, MethodDefEntry> reference : this.methodReferences.values()) {
+                        if (reference.context == methodEntry) {
                                 behaviorEntries.add(reference.entry);
                         }
                 }
@@ -711,20 +378,12 @@ public class JarIndex {
                 return this.outerClassesByInner.get(obfInnerClassEntry);
         }
 
-        public boolean isAnonymousClass(ClassEntry obfInnerClassEntry) {
-                return this.anonymousClasses.containsKey(obfInnerClassEntry);
-        }
-
         public boolean isSyntheticMethod(MethodEntry methodEntry) {
                 return this.syntheticMethods.contains(methodEntry);
         }
 
-        public BehaviorEntry getAnonymousClassCaller(ClassEntry obfInnerClassName) {
-                return this.anonymousClasses.get(obfInnerClassName);
-        }
-
         public Set<ClassEntry> getInterfaces(String className) {
-                ClassEntry classEntry = new ClassEntry(className);
+                ClassEntry classEntry = entryPool.getClass(className);
                 Set<ClassEntry> interfaces = new HashSet<>();
                 interfaces.addAll(this.translationIndex.getInterfaces(classEntry));
                 for (ClassEntry ancestor : this.translationIndex.getAncestry(classEntry)) {
@@ -754,7 +413,7 @@ public class JarIndex {
         }
 
         public boolean isInterface(String className) {
-                return this.translationIndex.isInterface(new ClassEntry(className));
+                return this.translationIndex.isInterface(entryPool.getClass(className));
         }
 
         public boolean containsObfClass(ClassEntry obfClassEntry) {
@@ -765,8 +424,8 @@ public class JarIndex {
                 return this.access.containsKey(obfFieldEntry);
         }
 
-        public boolean containsObfBehavior(BehaviorEntry obfBehaviorEntry) {
-                return this.access.containsKey(obfBehaviorEntry);
+        public boolean containsObfMethod(MethodEntry obfMethodEntry) {
+                return this.access.containsKey(obfMethodEntry);
         }
 
         public boolean containsEntryWithSameName(Entry entry) {
@@ -776,15 +435,13 @@ public class JarIndex {
                 return false;
         }
 
-        public boolean containsObfArgument(ArgumentEntry obfArgumentEntry) {
+        public boolean containsObfVariable(LocalVariableEntry obfVariableEntry) {
                 // check the behavior
-                if (!containsObfBehavior(obfArgumentEntry.getBehaviorEntry())) {
+                if (!containsObfMethod(obfVariableEntry.getOwnerEntry())) {
                         return false;
                 }
 
-                // check the argument
-                return obfArgumentEntry.getIndex() < obfArgumentEntry.getBehaviorEntry().getSignature().getArgumentTypes().size();
-
+                return true;
         }
 
         public boolean containsObfEntry(Entry obfEntry) {
@@ -792,15 +449,12 @@ public class JarIndex {
                         return containsObfClass((ClassEntry) obfEntry);
                 } else if (obfEntry instanceof FieldEntry) {
                         return containsObfField((FieldEntry) obfEntry);
-                } else if (obfEntry instanceof BehaviorEntry) {
-                        return containsObfBehavior((BehaviorEntry) obfEntry);
-                } else if (obfEntry instanceof ArgumentEntry) {
-                        return containsObfArgument((ArgumentEntry) obfEntry);
+                } else if (obfEntry instanceof MethodEntry) {
+                        return containsObfMethod((MethodEntry) obfEntry);
                 } else if (obfEntry instanceof LocalVariableEntry) {
-                        // TODO: Implement it
-                        return false;
+                        return containsObfVariable((LocalVariableEntry) obfEntry);
                 } else {
-                        throw new Error("Entry type not supported: " + obfEntry.getClass().getName());
+                        throw new Error("Entry desc not supported: " + obfEntry.getClass().getName());
                 }
         }
 
diff --git a/src/main/java/cuchaz/enigma/analysis/MethodImplementationsTreeNode.java b/src/main/java/cuchaz/enigma/analysis/MethodImplementationsTreeNode.java
index bacb1aa..6791b83 100644
--- a/src/main/java/cuchaz/enigma/analysis/MethodImplementationsTreeNode.java
+++ b/src/main/java/cuchaz/enigma/analysis/MethodImplementationsTreeNode.java
@@ -54,11 +54,11 @@ public class MethodImplementationsTreeNode extends DefaultMutableTreeNode {
         }
 
         public String getDeobfClassName() {
-                return this.deobfuscatingTranslator.translateClass(this.entry.getClassName());
+                return this.deobfuscatingTranslator.getTranslatedClass(this.entry.getOwnerClassEntry()).getClassName();
         }
 
         public String getDeobfMethodName() {
-                return this.deobfuscatingTranslator.translate(this.entry);
+                return this.deobfuscatingTranslator.getTranslatedMethod(this.entry).getName();
         }
 
         @Override
@@ -80,9 +80,8 @@ public class MethodImplementationsTreeNode extends DefaultMutableTreeNode {
                 // get all method implementations
                 List<MethodImplementationsTreeNode> nodes = Lists.newArrayList();
                 for (String implementingClassName : index.getImplementingClasses(this.entry.getClassName())) {
-                        MethodEntry methodEntry = new MethodEntry(new ClassEntry(implementingClassName), this.entry.getName(), this.entry.getSignature()
-                        );
-                        if (index.containsObfBehavior(methodEntry)) {
+                        MethodEntry methodEntry = new MethodEntry(new ClassEntry(implementingClassName), this.entry.getName(), this.entry.getDesc());
+                        if (index.containsObfMethod(methodEntry)) {
                                 nodes.add(new MethodImplementationsTreeNode(this.deobfuscatingTranslator, methodEntry));
                         }
                 }
diff --git a/src/main/java/cuchaz/enigma/analysis/MethodInheritanceTreeNode.java b/src/main/java/cuchaz/enigma/analysis/MethodInheritanceTreeNode.java
index 4f84dd0..f060ed9 100644
--- a/src/main/java/cuchaz/enigma/analysis/MethodInheritanceTreeNode.java
+++ b/src/main/java/cuchaz/enigma/analysis/MethodInheritanceTreeNode.java
@@ -52,11 +52,11 @@ public class MethodInheritanceTreeNode extends DefaultMutableTreeNode {
         }
 
         public String getDeobfClassName() {
-                return this.deobfuscatingTranslator.translateClass(this.entry.getClassName());
+                return this.deobfuscatingTranslator.getTranslatedClass(this.entry.getOwnerClassEntry()).getName();
         }
 
         public String getDeobfMethodName() {
-                return this.deobfuscatingTranslator.translate(this.entry);
+                return this.deobfuscatingTranslator.getTranslatedMethod(this.entry).getName();
         }
 
         public boolean isImplemented() {
@@ -84,11 +84,9 @@ public class MethodInheritanceTreeNode extends DefaultMutableTreeNode {
         public void load(JarIndex index, boolean recurse) {
                 // get all the child nodes
                 List<MethodInheritanceTreeNode> nodes = Lists.newArrayList();
-                for (ClassEntry subclassEntry : index.getTranslationIndex().getSubclass(this.entry.getClassEntry())) {
-                        MethodEntry methodEntry = new MethodEntry(subclassEntry, this.entry.getName(), this.entry.getSignature()
-                        );
-                        nodes.add(new MethodInheritanceTreeNode(this.deobfuscatingTranslator, methodEntry, index.containsObfBehavior(methodEntry)
-                        ));
+                for (ClassEntry subclassEntry : index.getTranslationIndex().getSubclass(this.entry.getOwnerClassEntry())) {
+                        MethodEntry methodEntry = new MethodEntry(subclassEntry, this.entry.getName(), this.entry.getDesc());
+                        nodes.add(new MethodInheritanceTreeNode(this.deobfuscatingTranslator, methodEntry, index.containsObfMethod(methodEntry)));
                 }
 
                 // add them to this node
diff --git a/src/main/java/cuchaz/enigma/analysis/BehaviorReferenceTreeNode.java b/src/main/java/cuchaz/enigma/analysis/MethodReferenceTreeNode.java
index 6556b2c..37b4073 100644
--- a/src/main/java/cuchaz/enigma/analysis/BehaviorReferenceTreeNode.java
+++ b/src/main/java/cuchaz/enigma/analysis/MethodReferenceTreeNode.java
@@ -12,30 +12,28 @@
 package cuchaz.enigma.analysis;
 
 import com.google.common.collect.Sets;
-import cuchaz.enigma.mapping.BehaviorEntry;
-import cuchaz.enigma.mapping.Entry;
-import cuchaz.enigma.mapping.Translator;
+import cuchaz.enigma.mapping.*;
 
 import javax.swing.tree.DefaultMutableTreeNode;
 import javax.swing.tree.TreeNode;
 import java.util.Set;
 
-public class BehaviorReferenceTreeNode extends DefaultMutableTreeNode
-        implements ReferenceTreeNode<BehaviorEntry, BehaviorEntry> {
+public class MethodReferenceTreeNode extends DefaultMutableTreeNode
+        implements ReferenceTreeNode<MethodEntry, MethodDefEntry> {
 
         private Translator deobfuscatingTranslator;
-        private BehaviorEntry entry;
-        private EntryReference<BehaviorEntry, BehaviorEntry> reference;
+        private MethodEntry entry;
+        private EntryReference<MethodEntry, MethodDefEntry> reference;
         private Access access;
 
-        public BehaviorReferenceTreeNode(Translator deobfuscatingTranslator, BehaviorEntry entry) {
+        public MethodReferenceTreeNode(Translator deobfuscatingTranslator, MethodEntry entry) {
                 this.deobfuscatingTranslator = deobfuscatingTranslator;
                 this.entry = entry;
                 this.reference = null;
         }
 
-        public BehaviorReferenceTreeNode(Translator deobfuscatingTranslator,
-                                         EntryReference<BehaviorEntry, BehaviorEntry> reference, Access access) {
+        public MethodReferenceTreeNode(Translator deobfuscatingTranslator,
+                                                                   EntryReference<MethodEntry, MethodDefEntry> reference, Access access) {
                 this.deobfuscatingTranslator = deobfuscatingTranslator;
                 this.entry = reference.entry;
                 this.reference = reference;
@@ -43,42 +41,42 @@ public class BehaviorReferenceTreeNode extends DefaultMutableTreeNode
         }
 
         @Override
-        public BehaviorEntry getEntry() {
+        public MethodEntry getEntry() {
                 return this.entry;
         }
 
         @Override
-        public EntryReference<BehaviorEntry, BehaviorEntry> getReference() {
+        public EntryReference<MethodEntry, MethodDefEntry> getReference() {
                 return this.reference;
         }
 
         @Override
         public String toString() {
                 if (this.reference != null) {
-                        return String.format("%s (%s)", this.deobfuscatingTranslator.translateEntry(this.reference.context),
+                        return String.format("%s (%s)", this.deobfuscatingTranslator.getTranslatedMethodDef(this.reference.context),
                                 this.access);
                 }
-                return this.deobfuscatingTranslator.translateEntry(this.entry).toString();
+                return this.deobfuscatingTranslator.getTranslatedMethod(this.entry).getName();
         }
 
         public void load(JarIndex index, boolean recurse) {
                 // get all the child nodes
-                for (EntryReference<BehaviorEntry, BehaviorEntry> reference : index.getBehaviorReferences(this.entry)) {
-                        add(new BehaviorReferenceTreeNode(this.deobfuscatingTranslator, reference, index.getAccess(this.entry)));
+                for (EntryReference<MethodEntry, MethodDefEntry> reference : index.getMethodReferences(this.entry)) {
+                        add(new MethodReferenceTreeNode(this.deobfuscatingTranslator, reference, index.getAccess(this.entry)));
                 }
 
                 if (recurse && this.children != null) {
                         for (Object child : this.children) {
-                                if (child instanceof BehaviorReferenceTreeNode) {
-                                        BehaviorReferenceTreeNode node = (BehaviorReferenceTreeNode) child;
+                                if (child instanceof MethodReferenceTreeNode) {
+                                        MethodReferenceTreeNode node = (MethodReferenceTreeNode) child;
 
                                         // don't recurse into ancestor
                                         Set<Entry> ancestors = Sets.newHashSet();
                                         TreeNode n = node;
                                         while (n.getParent() != null) {
                                                 n = n.getParent();
-                                                if (n instanceof BehaviorReferenceTreeNode) {
-                                                        ancestors.add(((BehaviorReferenceTreeNode) n).getEntry());
+                                                if (n instanceof MethodReferenceTreeNode) {
+                                                        ancestors.add(((MethodReferenceTreeNode) n).getEntry());
                                                 }
                                         }
                                         if (ancestors.contains(node.getEntry())) {
diff --git a/src/main/java/cuchaz/enigma/analysis/ParsedJar.java b/src/main/java/cuchaz/enigma/analysis/ParsedJar.java
new file mode 100644
index 0000000..78ef722
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/analysis/ParsedJar.java
@@ -0,0 +1,72 @@
+/*******************************************************************************
+ * 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.analysis;
+
+import cuchaz.enigma.mapping.ClassEntry;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.tree.ClassNode;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.*;
+import java.util.function.Consumer;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+public class ParsedJar {
+        private final Map<String, ClassNode> nodes = new LinkedHashMap<>();
+
+        public ParsedJar(JarFile jar) throws IOException {
+                try {
+                        // get the jar entries that correspond to classes
+                        Enumeration<JarEntry> entries = jar.entries();
+                        while (entries.hasMoreElements()) {
+                                JarEntry entry = entries.nextElement();
+                                // is this a class file?
+                                if (entry.getName().endsWith(".class")) {
+                                        try (InputStream input = jar.getInputStream(entry)) {
+                                                // read the ClassNode from the jar
+                                                ClassReader reader = new ClassReader(input);
+                                                ClassNode node = new ClassNode();
+                                                reader.accept(node, 0);
+                                                String path = entry.getName().substring(0, entry.getName().length() - ".class".length());
+                                                nodes.put(path, node);
+                                        }
+                                }
+                        }
+                } finally {
+                        jar.close();
+                }
+        }
+
+        public void visit(Consumer<ClassNode> visitor) {
+                for (ClassNode node : nodes.values()) {
+                        visitor.accept(node);
+                }
+        }
+
+        public int getClassCount() {
+                return nodes.size();
+        }
+
+        public List<ClassEntry> getClassEntries() {
+                List<ClassEntry> entries = new ArrayList<>(nodes.size());
+                for (ClassNode node : nodes.values()) {
+                        entries.add(new ClassEntry(node.name));
+                }
+                return entries;
+        }
+
+        public ClassNode getClassNode(String name) {
+                return nodes.get(name);
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/analysis/SourceIndexClassVisitor.java b/src/main/java/cuchaz/enigma/analysis/SourceIndexClassVisitor.java
index b13415d..015eaac 100644
--- a/src/main/java/cuchaz/enigma/analysis/SourceIndexClassVisitor.java
+++ b/src/main/java/cuchaz/enigma/analysis/SourceIndexClassVisitor.java
@@ -20,11 +20,16 @@ import com.strobel.decompiler.languages.java.ast.*;
 import cuchaz.enigma.mapping.*;
 
 public class SourceIndexClassVisitor extends SourceIndexVisitor {
+        private final ReferencedEntryPool entryPool;
+        private final ProcyonEntryFactory entryFactory;
 
         private ClassEntry classEntry;
         private boolean isEnum;
 
-        public SourceIndexClassVisitor(ClassEntry classEntry) {
+        public SourceIndexClassVisitor(ReferencedEntryPool entryPool, ClassEntry classEntry) {
+                super(entryPool);
+                this.entryPool = entryPool;
+                this.entryFactory = new ProcyonEntryFactory(entryPool);
                 this.classEntry = classEntry;
         }
 
@@ -34,9 +39,9 @@ public class SourceIndexClassVisitor extends SourceIndexVisitor {
                 TypeDefinition def = node.getUserData(Keys.TYPE_DEFINITION);
                 ClassEntry classEntry = new ClassEntry(def.getInternalName());
                 if (!classEntry.equals(this.classEntry)) {
-                        // it's a sub-type, recurse
+                        // it's a subtype, recurse
                         index.addDeclaration(node.getNameToken(), classEntry);
-                        return node.acceptVisitor(new SourceIndexClassVisitor(classEntry), index);
+                        return node.acceptVisitor(new SourceIndexClassVisitor(entryPool, classEntry), index);
                 }
 
                 return recurse(node, index);
@@ -56,31 +61,28 @@ public class SourceIndexClassVisitor extends SourceIndexVisitor {
         @Override
         public Void visitMethodDeclaration(MethodDeclaration node, SourceIndex index) {
                 MethodDefinition def = node.getUserData(Keys.METHOD_DEFINITION);
-                BehaviorEntry behaviorEntry = ProcyonEntryFactory.getBehaviorEntry(def);
+                MethodDefEntry methodEntry = entryFactory.getMethodDefEntry(def);
                 AstNode tokenNode = node.getNameToken();
-                if (behaviorEntry instanceof ConstructorEntry) {
-                        ConstructorEntry constructorEntry = (ConstructorEntry) behaviorEntry;
-                        if (constructorEntry.isStatic()) {
-                                // for static initializers, check elsewhere for the token node
-                                tokenNode = node.getModifiers().firstOrNullObject();
-                        }
+                if (methodEntry.isConstructor() && methodEntry.getName().equals("<clinit>")) {
+                        // for static initializers, check elsewhere for the token node
+                        tokenNode = node.getModifiers().firstOrNullObject();
                 }
-                index.addDeclaration(tokenNode, behaviorEntry);
-                return node.acceptVisitor(new SourceIndexBehaviorVisitor(behaviorEntry, false), index);
+                index.addDeclaration(tokenNode, methodEntry);
+                return node.acceptVisitor(new SourceIndexMethodVisitor(entryPool, methodEntry, false), index);
         }
 
         @Override
         public Void visitConstructorDeclaration(ConstructorDeclaration node, SourceIndex index) {
                 MethodDefinition def = node.getUserData(Keys.METHOD_DEFINITION);
-                ConstructorEntry constructorEntry = ProcyonEntryFactory.getConstructorEntry(def);
-                index.addDeclaration(node.getNameToken(), constructorEntry);
-                return node.acceptVisitor(new SourceIndexBehaviorVisitor(constructorEntry, isEnum), index);
+                MethodDefEntry methodEntry = entryFactory.getMethodDefEntry(def);
+                index.addDeclaration(node.getNameToken(), methodEntry);
+                return node.acceptVisitor(new SourceIndexMethodVisitor(entryPool, methodEntry, isEnum), index);
         }
 
         @Override
         public Void visitFieldDeclaration(FieldDeclaration node, SourceIndex index) {
                 FieldDefinition def = node.getUserData(Keys.FIELD_DEFINITION);
-                FieldEntry fieldEntry = ProcyonEntryFactory.getFieldEntry(def);
+                FieldDefEntry fieldEntry = entryFactory.getFieldDefEntry(def);
                 assert (node.getVariables().size() == 1);
                 VariableInitializer variable = node.getVariables().firstOrNullObject();
                 index.addDeclaration(variable.getNameToken(), fieldEntry);
@@ -92,7 +94,7 @@ public class SourceIndexClassVisitor extends SourceIndexVisitor {
         public Void visitEnumValueDeclaration(EnumValueDeclaration node, SourceIndex index) {
                 // treat enum declarations as field declarations
                 FieldDefinition def = node.getUserData(Keys.FIELD_DEFINITION);
-                FieldEntry fieldEntry = ProcyonEntryFactory.getFieldEntry(def);
+                FieldDefEntry fieldEntry = entryFactory.getFieldDefEntry(def);
                 index.addDeclaration(node.getNameToken(), fieldEntry);
                 this.isEnum = true;
                 return recurse(node, index);
diff --git a/src/main/java/cuchaz/enigma/analysis/SourceIndexBehaviorVisitor.java b/src/main/java/cuchaz/enigma/analysis/SourceIndexMethodVisitor.java
index 1b61916..2a62241 100644
--- a/src/main/java/cuchaz/enigma/analysis/SourceIndexBehaviorVisitor.java
+++ b/src/main/java/cuchaz/enigma/analysis/SourceIndexMethodVisitor.java
@@ -20,13 +20,15 @@ import com.strobel.assembler.metadata.TypeReference;
 import com.strobel.decompiler.languages.TextLocation;
 import com.strobel.decompiler.languages.java.ast.*;
 import cuchaz.enigma.mapping.*;
-import javassist.bytecode.Descriptor;
 
 import java.util.HashMap;
 import java.util.Map;
 
-public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
-        private BehaviorEntry behaviorEntry;
+public class SourceIndexMethodVisitor extends SourceIndexVisitor {
+        private final ReferencedEntryPool entryPool;
+        private final ProcyonEntryFactory entryFactory;
+
+        private MethodDefEntry methodEntry;
 
         // TODO: Really fix Procyon index problem with inner classes
         private int argumentPosition;
@@ -34,8 +36,11 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
         private Multimap<String, Identifier> unmatchedIdentifier = HashMultimap.create();
         private Map<String, Entry> identifierEntryCache = new HashMap<>();
 
-        public SourceIndexBehaviorVisitor(BehaviorEntry behaviorEntry, boolean isEnum) {
-                this.behaviorEntry = behaviorEntry;
+        public SourceIndexMethodVisitor(ReferencedEntryPool entryPool, MethodDefEntry methodEntry, boolean isEnum) {
+                super(entryPool);
+                this.entryPool = entryPool;
+                this.entryFactory = new ProcyonEntryFactory(entryPool);
+                this.methodEntry = methodEntry;
                 this.argumentPosition = isEnum ? 2 : 0;
                 this.localsPosition = 0;
         }
@@ -45,19 +50,12 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
                 MemberReference ref = node.getUserData(Keys.MEMBER_REFERENCE);
 
                 // get the behavior entry
-                ClassEntry classEntry = new ClassEntry(ref.getDeclaringType().getInternalName());
-                BehaviorEntry behaviorEntry = null;
+                ClassEntry classEntry = entryPool.getClass(ref.getDeclaringType().getInternalName());
+                MethodEntry methodEntry = null;
                 if (ref instanceof MethodReference) {
-                        MethodReference methodRef = (MethodReference) ref;
-                        if (methodRef.isConstructor()) {
-                                behaviorEntry = new ConstructorEntry(classEntry, new Signature(ref.getErasedSignature()));
-                        } else if (methodRef.isTypeInitializer()) {
-                                behaviorEntry = new ConstructorEntry(classEntry);
-                        } else {
-                                behaviorEntry = new MethodEntry(classEntry, ref.getName(), new Signature(ref.getErasedSignature()));
-                        }
+                        methodEntry = entryPool.getMethod(classEntry, ref.getName(), ref.getErasedSignature());
                 }
-                if (behaviorEntry != null) {
+                if (methodEntry != null) {
                         // get the node for the token
                         AstNode tokenNode = null;
                         if (node.getTarget() instanceof MemberReferenceExpression) {
@@ -68,13 +66,13 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
                                 tokenNode = node.getTarget();
                         }
                         if (tokenNode != null) {
-                                index.addReference(tokenNode, behaviorEntry, this.behaviorEntry);
+                                index.addReference(tokenNode, methodEntry, this.methodEntry);
                         }
                 }
 
                 // Check for identifier
                 node.getArguments().stream().filter(expression -> expression instanceof IdentifierExpression)
-                        .forEach(expression -> this.checkIdentifier((IdentifierExpression) expression, index));
+                                .forEach(expression -> this.checkIdentifier((IdentifierExpression) expression, index));
                 return recurse(node, index);
         }
 
@@ -83,13 +81,17 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
                 MemberReference ref = node.getUserData(Keys.MEMBER_REFERENCE);
                 if (ref != null) {
                         // make sure this is actually a field
-                        if (ref.getErasedSignature().indexOf('(') >= 0) {
+                        String erasedSignature = ref.getErasedSignature();
+                        if (erasedSignature.indexOf('(') >= 0) {
                                 throw new Error("Expected a field here! got " + ref);
                         }
 
-                        ClassEntry classEntry = new ClassEntry(ref.getDeclaringType().getInternalName());
-                        FieldEntry fieldEntry = new FieldEntry(classEntry, ref.getName(), new Type(ref.getErasedSignature()));
-                        index.addReference(node.getMemberNameToken(), fieldEntry, this.behaviorEntry);
+                        ClassEntry classEntry = entryPool.getClass(ref.getDeclaringType().getInternalName());
+                        FieldEntry fieldEntry = entryPool.getField(classEntry, ref.getName(), new TypeDescriptor(erasedSignature));
+                        if (fieldEntry == null) {
+                                throw new Error("Failed to find field " + ref.getName() + " on " + classEntry.getName());
+                        }
+                        index.addReference(node.getMemberNameToken(), fieldEntry, this.methodEntry);
                 }
 
                 return recurse(node, index);
@@ -99,8 +101,8 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
         public Void visitSimpleType(SimpleType node, SourceIndex index) {
                 TypeReference ref = node.getUserData(Keys.TYPE_REFERENCE);
                 if (node.getIdentifierToken().getStartLocation() != TextLocation.EMPTY) {
-                        ClassEntry classEntry = new ClassEntry(ref.getInternalName());
-                        index.addReference(node.getIdentifierToken(), classEntry, this.behaviorEntry);
+                        ClassEntry classEntry = entryPool.getClass(ref.getInternalName());
+                        index.addReference(node.getIdentifierToken(), classEntry, this.methodEntry);
                 }
 
                 return recurse(node, index);
@@ -110,12 +112,12 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
         public Void visitParameterDeclaration(ParameterDeclaration node, SourceIndex index) {
                 ParameterDefinition def = node.getUserData(Keys.PARAMETER_DEFINITION);
                 if (def.getMethod() instanceof MemberReference && def.getMethod() instanceof MethodReference) {
-                        ArgumentEntry argumentEntry = new ArgumentEntry(ProcyonEntryFactory.getBehaviorEntry((MethodReference) def.getMethod()),
-                                argumentPosition++, node.getName());
+                        MethodEntry methodEntry = entryFactory.getMethodEntry((MethodReference) def.getMethod());
+                        LocalVariableEntry localVariableEntry = new LocalVariableEntry(methodEntry, argumentPosition++, node.getName());
                         Identifier identifier = node.getNameToken();
                         // cache the argument entry and the identifier
-                        identifierEntryCache.put(identifier.getName(), argumentEntry);
-                        index.addDeclaration(identifier, argumentEntry);
+                        identifierEntryCache.put(identifier.getName(), localVariableEntry);
+                        index.addDeclaration(identifier, localVariableEntry);
                 }
 
                 return recurse(node, index);
@@ -125,9 +127,12 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
         public Void visitIdentifierExpression(IdentifierExpression node, SourceIndex index) {
                 MemberReference ref = node.getUserData(Keys.MEMBER_REFERENCE);
                 if (ref != null) {
-                        ClassEntry classEntry = new ClassEntry(ref.getDeclaringType().getInternalName());
-                        FieldEntry fieldEntry = new FieldEntry(classEntry, ref.getName(), new Type(ref.getErasedSignature()));
-                        index.addReference(node.getIdentifierToken(), fieldEntry, this.behaviorEntry);
+                        ClassEntry classEntry = entryPool.getClass(ref.getDeclaringType().getInternalName());
+                        FieldEntry fieldEntry = entryPool.getField(classEntry, ref.getName(), new TypeDescriptor(ref.getErasedSignature()));
+                        if (fieldEntry == null) {
+                                throw new Error("Failed to find field " + ref.getName() + " on " + classEntry.getName());
+                        }
+                        index.addReference(node.getIdentifierToken(), fieldEntry, this.methodEntry);
                 } else
                         this.checkIdentifier(node, index);
                 return recurse(node, index);
@@ -155,11 +160,11 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
         public Void visitObjectCreationExpression(ObjectCreationExpression node, SourceIndex index) {
                 MemberReference ref = node.getUserData(Keys.MEMBER_REFERENCE);
                 if (ref != null) {
-                        ClassEntry classEntry = new ClassEntry(ref.getDeclaringType().getInternalName());
-                        ConstructorEntry constructorEntry = new ConstructorEntry(classEntry, new Signature(ref.getErasedSignature()));
+                        ClassEntry classEntry = entryPool.getClass(ref.getDeclaringType().getInternalName());
+                        MethodEntry constructorEntry = entryPool.getMethod(classEntry, "<init>", ref.getErasedSignature());
                         if (node.getType() instanceof SimpleType) {
                                 SimpleType simpleTypeNode = (SimpleType) node.getType();
-                                index.addReference(simpleTypeNode.getIdentifierToken(), constructorEntry, this.behaviorEntry);
+                                index.addReference(simpleTypeNode.getIdentifierToken(), constructorEntry, this.methodEntry);
                         }
                 }
 
@@ -169,11 +174,8 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
         @Override
         public Void visitForEachStatement(ForEachStatement node, SourceIndex index) {
                 if (node.getVariableType() instanceof SimpleType) {
-                        SimpleType type = (SimpleType) node.getVariableType();
-                        TypeReference typeReference = type.getUserData(Keys.TYPE_REFERENCE);
                         Identifier identifier = node.getVariableNameToken();
-                        String signature = Descriptor.of(typeReference.getErasedDescription());
-                        LocalVariableEntry localVariableEntry = new LocalVariableEntry(behaviorEntry, argumentPosition + localsPosition++, identifier.getName(), new Type(signature));
+                        LocalVariableEntry localVariableEntry = new LocalVariableEntry(methodEntry, argumentPosition + localsPosition++, identifier.getName());
                         identifierEntryCache.put(identifier.getName(), localVariableEntry);
                         addDeclarationToUnmatched(identifier.getName(), index);
                         index.addDeclaration(identifier, localVariableEntry);
@@ -189,11 +191,8 @@ public class SourceIndexBehaviorVisitor extends SourceIndexVisitor {
                 if (variables.size() == 1) {
                         VariableInitializer initializer = variables.firstOrNullObject();
                         if (initializer != null && node.getType() instanceof SimpleType) {
-                                SimpleType type = (SimpleType) node.getType();
-                                TypeReference typeReference = type.getUserData(Keys.TYPE_REFERENCE);
-                                String signature = Descriptor.of(typeReference.getErasedDescription());
                                 Identifier identifier = initializer.getNameToken();
-                                LocalVariableEntry localVariableEntry = new LocalVariableEntry(behaviorEntry, argumentPosition + localsPosition++, initializer.getName(), new Type(signature));
+                                LocalVariableEntry localVariableEntry = new LocalVariableEntry(methodEntry, argumentPosition + localsPosition++, initializer.getName());
                                 identifierEntryCache.put(identifier.getName(), localVariableEntry);
                                 addDeclarationToUnmatched(identifier.getName(), index);
                                 index.addDeclaration(identifier, localVariableEntry);
diff --git a/src/main/java/cuchaz/enigma/analysis/SourceIndexVisitor.java b/src/main/java/cuchaz/enigma/analysis/SourceIndexVisitor.java
index a94a55b..241b9f7 100644
--- a/src/main/java/cuchaz/enigma/analysis/SourceIndexVisitor.java
+++ b/src/main/java/cuchaz/enigma/analysis/SourceIndexVisitor.java
@@ -15,8 +15,14 @@ import com.strobel.assembler.metadata.TypeDefinition;
 import com.strobel.decompiler.languages.java.ast.*;
 import com.strobel.decompiler.patterns.Pattern;
 import cuchaz.enigma.mapping.ClassEntry;
+import cuchaz.enigma.mapping.ReferencedEntryPool;
 
 public class SourceIndexVisitor implements IAstVisitor<SourceIndex, Void> {
+        private final ReferencedEntryPool entryPool;
+
+        public SourceIndexVisitor(ReferencedEntryPool entryPool) {
+                this.entryPool = entryPool;
+        }
 
         @Override
         public Void visitTypeDeclaration(TypeDeclaration node, SourceIndex index) {
@@ -24,7 +30,7 @@ public class SourceIndexVisitor implements IAstVisitor<SourceIndex, Void> {
                 ClassEntry classEntry = new ClassEntry(def.getInternalName());
                 index.addDeclaration(node.getNameToken(), classEntry);
 
-                return node.acceptVisitor(new SourceIndexClassVisitor(classEntry), index);
+                return node.acceptVisitor(new SourceIndexClassVisitor(entryPool, classEntry), index);
         }
 
         protected Void recurse(AstNode node, SourceIndex index) {
diff --git a/src/main/java/cuchaz/enigma/analysis/TranslationIndex.java b/src/main/java/cuchaz/enigma/analysis/TranslationIndex.java
index 26be05b..3cd80ff 100644
--- a/src/main/java/cuchaz/enigma/analysis/TranslationIndex.java
+++ b/src/main/java/cuchaz/enigma/analysis/TranslationIndex.java
@@ -15,11 +15,8 @@ import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Multimap;
+import cuchaz.enigma.bytecode.AccessFlags;
 import cuchaz.enigma.mapping.*;
-import javassist.CtBehavior;
-import javassist.CtClass;
-import javassist.CtField;
-import javassist.bytecode.Descriptor;
 
 import java.util.Collection;
 import java.util.List;
@@ -28,96 +25,91 @@ import java.util.Set;
 
 public class TranslationIndex {
 
+        private final ReferencedEntryPool entryPool;
         private Map<ClassEntry, ClassEntry> superclasses;
-        private Multimap<ClassEntry, FieldEntry> fieldEntries;
-        private Multimap<ClassEntry, BehaviorEntry> behaviorEntries;
+        private Multimap<ClassEntry, FieldDefEntry> fieldEntries;
+        private Multimap<ClassEntry, MethodDefEntry> methodEntries;
         private Multimap<ClassEntry, ClassEntry> interfaces;
 
-        public TranslationIndex() {
+        public TranslationIndex(ReferencedEntryPool entryPool) {
+                this.entryPool = entryPool;
                 this.superclasses = Maps.newHashMap();
                 this.fieldEntries = HashMultimap.create();
-                this.behaviorEntries = HashMultimap.create();
+                this.methodEntries = HashMultimap.create();
                 this.interfaces = HashMultimap.create();
         }
 
         public TranslationIndex(TranslationIndex other, Translator translator) {
+                this.entryPool = other.entryPool;
+
                 // translate the superclasses
                 this.superclasses = Maps.newHashMap();
                 for (Map.Entry<ClassEntry, ClassEntry> mapEntry : other.superclasses.entrySet()) {
-                        this.superclasses.put(translator.translateEntry(mapEntry.getKey()), translator.translateEntry(mapEntry.getValue()));
+                        this.superclasses.put(translator.getTranslatedClass(mapEntry.getKey()), translator.getTranslatedClass(mapEntry.getValue()));
                 }
 
                 // translate the interfaces
                 this.interfaces = HashMultimap.create();
                 for (Map.Entry<ClassEntry, ClassEntry> mapEntry : other.interfaces.entries()) {
                         this.interfaces.put(
-                                translator.translateEntry(mapEntry.getKey()),
-                                translator.translateEntry(mapEntry.getValue())
+                                        translator.getTranslatedClass(mapEntry.getKey()),
+                                        translator.getTranslatedClass(mapEntry.getValue())
                         );
                 }
 
                 // translate the fields
                 this.fieldEntries = HashMultimap.create();
-                for (Map.Entry<ClassEntry, FieldEntry> mapEntry : other.fieldEntries.entries()) {
+                for (Map.Entry<ClassEntry, FieldDefEntry> mapEntry : other.fieldEntries.entries()) {
                         this.fieldEntries.put(
-                                translator.translateEntry(mapEntry.getKey()),
-                                translator.translateEntry(mapEntry.getValue())
+                                        translator.getTranslatedClass(mapEntry.getKey()),
+                                        translator.getTranslatedFieldDef(mapEntry.getValue())
                         );
                 }
 
-                this.behaviorEntries = HashMultimap.create();
-                for (Map.Entry<ClassEntry, BehaviorEntry> mapEntry : other.behaviorEntries.entries()) {
-                        this.behaviorEntries.put(
-                                translator.translateEntry(mapEntry.getKey()),
-                                translator.translateEntry(mapEntry.getValue())
+                this.methodEntries = HashMultimap.create();
+                for (Map.Entry<ClassEntry, MethodDefEntry> mapEntry : other.methodEntries.entries()) {
+                        this.methodEntries.put(
+                                        translator.getTranslatedClass(mapEntry.getKey()),
+                                        translator.getTranslatedMethodDef(mapEntry.getValue())
                         );
                 }
         }
 
-        public void indexClass(CtClass c) {
-                indexClass(c, true);
-        }
-
-        public void indexClass(CtClass c, boolean indexMembers) {
-                ClassEntry classEntry = EntryFactory.getClassEntry(c);
+        protected ClassDefEntry indexClass(int access, String name, String superName, String[] interfaces) {
+                ClassDefEntry classEntry = new ClassDefEntry(name, new AccessFlags(access));
                 if (isJre(classEntry)) {
-                        return;
+                        return null;
                 }
 
                 // add the superclass
-                ClassEntry superclassEntry = EntryFactory.getSuperclassEntry(c);
-                if (superclassEntry != null) {
+                ClassEntry superclassEntry = entryPool.getClass(superName);
+                if (!isJre(superclassEntry)) {
                         this.superclasses.put(classEntry, superclassEntry);
                 }
 
                 // add the interfaces
-                for (String interfaceClassName : c.getClassFile().getInterfaces()) {
-                        ClassEntry interfaceClassEntry = new ClassEntry(Descriptor.toJvmName(interfaceClassName));
+                for (String interfaceClassName : interfaces) {
+                        ClassEntry interfaceClassEntry = entryPool.getClass(interfaceClassName);
                         if (!isJre(interfaceClassEntry)) {
-
                                 this.interfaces.put(classEntry, interfaceClassEntry);
                         }
                 }
 
-                if (indexMembers) {
-                        // add fields
-                        for (CtField field : c.getDeclaredFields()) {
-                                FieldEntry fieldEntry = EntryFactory.getFieldEntry(field);
-                                this.fieldEntries.put(fieldEntry.getClassEntry(), fieldEntry);
-                        }
+                return classEntry;
+        }
 
-                        // add behaviors
-                        for (CtBehavior behavior : c.getDeclaredBehaviors()) {
-                                BehaviorEntry behaviorEntry = EntryFactory.getBehaviorEntry(behavior);
-                                this.behaviorEntries.put(behaviorEntry.getClassEntry(), behaviorEntry);
-                        }
-                }
+        protected void indexField(FieldDefEntry fieldEntry) {
+                this.fieldEntries.put(fieldEntry.getOwnerClassEntry(), fieldEntry);
+        }
+
+        protected void indexMethod(MethodDefEntry methodEntry) {
+                this.methodEntries.put(methodEntry.getOwnerClassEntry(), methodEntry);
         }
 
         public void renameClasses(Map<String, String> renames) {
                 EntryRenamer.renameClassesInMap(renames, this.superclasses);
                 EntryRenamer.renameClassesInMultimap(renames, this.fieldEntries);
-                EntryRenamer.renameClassesInMultimap(renames, this.behaviorEntries);
+                EntryRenamer.renameClassesInMultimap(renames, this.methodEntries);
         }
 
         public ClassEntry getSuperclass(ClassEntry classEntry) {
@@ -175,31 +167,32 @@ public class TranslationIndex {
         }
 
         public boolean entryExists(Entry entry) {
+                if (entry == null) {
+                        return false;
+                }
                 if (entry instanceof FieldEntry) {
                         return fieldExists((FieldEntry) entry);
-                } else if (entry instanceof BehaviorEntry) {
-                        return behaviorExists((BehaviorEntry) entry);
-                } else if (entry instanceof ArgumentEntry) {
-                        return behaviorExists(((ArgumentEntry) entry).getBehaviorEntry());
+                } else if (entry instanceof MethodEntry) {
+                        return methodExists((MethodEntry) entry);
                 } else if (entry instanceof LocalVariableEntry) {
-                        return behaviorExists(((LocalVariableEntry) entry).getBehaviorEntry());
+                        return methodExists(((LocalVariableEntry) entry).getOwnerEntry());
                 }
                 throw new IllegalArgumentException("Cannot check existence for " + entry.getClass());
         }
 
         public boolean fieldExists(FieldEntry fieldEntry) {
-                return this.fieldEntries.containsEntry(fieldEntry.getClassEntry(), fieldEntry);
+                return this.fieldEntries.containsEntry(fieldEntry.getOwnerClassEntry(), fieldEntry);
         }
 
-        public boolean behaviorExists(BehaviorEntry behaviorEntry) {
-                return this.behaviorEntries.containsEntry(behaviorEntry.getClassEntry(), behaviorEntry);
+        public boolean methodExists(MethodEntry methodEntry) {
+                return this.methodEntries.containsEntry(methodEntry.getOwnerClassEntry(), methodEntry);
         }
 
-        public ClassEntry resolveEntryClass(Entry entry) {
-                return resolveEntryClass(entry, false);
+        public ClassEntry resolveEntryOwner(Entry entry) {
+                return resolveEntryOwner(entry, false);
         }
 
-        public ClassEntry resolveEntryClass(Entry entry, boolean checkSuperclassBeforeChild) {
+        public ClassEntry resolveEntryOwner(Entry entry, boolean checkSuperclassBeforeChild) {
                 if (entry instanceof ClassEntry) {
                         return (ClassEntry) entry;
                 }
@@ -227,12 +220,12 @@ public class TranslationIndex {
                 Entry originalEntry = entry;
 
                 // Get all possible superclasses and reverse the list
-                List<ClassEntry> superclasses = Lists.reverse(getAncestry(originalEntry.getClassEntry()));
+                List<ClassEntry> superclasses = Lists.reverse(getAncestry(originalEntry.getOwnerClassEntry()));
 
                 boolean existInEntry = false;
 
                 for (ClassEntry classEntry : superclasses) {
-                        entry = entry.cloneToNewClass(classEntry);
+                        entry = entry.updateOwnership(classEntry);
                         existInEntry = entryExists(entry);
 
                         // Check for possible entry in interfaces of superclasses
@@ -245,9 +238,9 @@ public class TranslationIndex {
 
                 // Doesn't exists in superclasses? check the child or return null
                 if (!existInEntry)
-                        return !entryExists(originalEntry) ? null : originalEntry.getClassEntry();
+                        return !entryExists(originalEntry) ? null : originalEntry.getOwnerClassEntry();
 
-                return entry.getClassEntry();
+                return entry.getOwnerClassEntry();
         }
 
         public ClassEntry resolveSuperclass(Entry entry) {
@@ -256,7 +249,7 @@ public class TranslationIndex {
 
                 while (!entryExists(entry)) {
                         // is there a parent class?
-                        ClassEntry superclassEntry = getSuperclass(entry.getClassEntry());
+                        ClassEntry superclassEntry = getSuperclass(entry.getOwnerClassEntry());
                         if (superclassEntry == null) {
                                 // this is probably a method from a class in a library
                                 // we can't trace the implementation up any higher unless we index the library
@@ -264,23 +257,23 @@ public class TranslationIndex {
                         }
 
                         // move up to the parent class
-                        entry = entry.cloneToNewClass(superclassEntry);
+                        entry = entry.updateOwnership(superclassEntry);
                 }
-                return entry.getClassEntry();
+                return entry.getOwnerClassEntry();
         }
 
         public ClassEntry resolveInterface(Entry entry) {
                 // the interfaces for any class is a forest
                 // so let's look at all the trees
 
-                for (ClassEntry interfaceEntry : this.interfaces.get(entry.getClassEntry())) {
+                for (ClassEntry interfaceEntry : this.interfaces.get(entry.getOwnerClassEntry())) {
                         Collection<ClassEntry> subInterface = this.interfaces.get(interfaceEntry);
                         if (subInterface != null && !subInterface.isEmpty()) {
-                                ClassEntry result = resolveInterface(entry.cloneToNewClass(interfaceEntry));
+                                ClassEntry result = resolveInterface(entry.updateOwnership(interfaceEntry));
                                 if (result != null)
                                         return result;
                         }
-                        ClassEntry resolvedClassEntry = resolveSuperclass(entry.cloneToNewClass(interfaceEntry));
+                        ClassEntry resolvedClassEntry = resolveSuperclass(entry.updateOwnership(interfaceEntry));
                         if (resolvedClassEntry != null) {
                                 return resolvedClassEntry;
                         }
diff --git a/src/main/java/cuchaz/enigma/bytecode/AccessFlags.java b/src/main/java/cuchaz/enigma/bytecode/AccessFlags.java
new file mode 100644
index 0000000..0999abf
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/bytecode/AccessFlags.java
@@ -0,0 +1,79 @@
+package cuchaz.enigma.bytecode;
+
+import org.objectweb.asm.Opcodes;
+
+import java.lang.reflect.Modifier;
+
+public class AccessFlags {
+        private static final int SYNTHETIC_FLAG = 0x00001000;
+        private static final int BRIDGED_FLAG = 0x00000040;
+
+        private int flags;
+
+        public AccessFlags(int flags) {
+                this.flags = flags;
+        }
+
+        public boolean isPrivate() {
+                return Modifier.isPrivate(this.flags);
+        }
+
+        public boolean isProtected() {
+                return Modifier.isProtected(this.flags);
+        }
+
+        public boolean isPublic() {
+                return Modifier.isPublic(this.flags);
+        }
+
+        public boolean isSynthetic() {
+                return (this.flags & SYNTHETIC_FLAG) != 0;
+        }
+
+        public boolean isStatic() {
+                return Modifier.isStatic(this.flags);
+        }
+
+        public AccessFlags setPrivate() {
+                this.setVisibility(Opcodes.ACC_PRIVATE);
+                return this;
+        }
+
+        public AccessFlags setProtected() {
+                this.setVisibility(Opcodes.ACC_PROTECTED);
+                return this;
+        }
+
+        public AccessFlags setPublic() {
+                this.setVisibility(Opcodes.ACC_PUBLIC);
+                return this;
+        }
+
+        public AccessFlags setBridged() {
+                this.setVisibility(BRIDGED_FLAG);
+                return this;
+        }
+
+        public void setVisibility(int visibility) {
+                this.resetVisibility();
+                this.flags |= visibility;
+        }
+
+        private void resetVisibility() {
+                this.flags &= ~(Opcodes.ACC_PRIVATE | Opcodes.ACC_PROTECTED | Opcodes.ACC_PUBLIC);
+        }
+
+        public int getFlags() {
+                return this.flags;
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+                return obj instanceof AccessFlags && ((AccessFlags) obj).flags == flags;
+        }
+
+        @Override
+        public int hashCode() {
+                return flags;
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/bytecode/ClassProtectifier.java b/src/main/java/cuchaz/enigma/bytecode/ClassProtectifier.java
index 6ec576e..9ed6db9 100644
--- a/src/main/java/cuchaz/enigma/bytecode/ClassProtectifier.java
+++ b/src/main/java/cuchaz/enigma/bytecode/ClassProtectifier.java
@@ -11,41 +11,39 @@
 
 package cuchaz.enigma.bytecode;
 
-import javassist.CtBehavior;
-import javassist.CtClass;
-import javassist.CtField;
-import javassist.bytecode.AccessFlag;
-import javassist.bytecode.InnerClassesAttribute;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.FieldVisitor;
+import org.objectweb.asm.MethodVisitor;
 
-public class ClassProtectifier {
+public class ClassProtectifier extends ClassVisitor {
 
-        public static CtClass protectify(CtClass c) {
-
-                // protectify all the fields
-                for (CtField field : c.getDeclaredFields()) {
-                        field.setModifiers(protectify(field.getModifiers()));
-                }
+        public ClassProtectifier(int api, ClassVisitor cv) {
+                super(api, cv);
+        }
 
-                // protectify all the methods and constructors
-                for (CtBehavior behavior : c.getDeclaredBehaviors()) {
-                        behavior.setModifiers(protectify(behavior.getModifiers()));
-                }
+        @Override
+        public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
+                access = protectify(access);
+                return super.visitMethod(access, name, desc, signature, exceptions);
+        }
 
-                // protectify all the inner classes
-                InnerClassesAttribute attr = (InnerClassesAttribute) c.getClassFile().getAttribute(InnerClassesAttribute.tag);
-                if (attr != null) {
-                        for (int i = 0; i < attr.tableLength(); i++) {
-                                attr.setAccessFlags(i, protectify(attr.accessFlags(i)));
-                        }
-                }
+        @Override
+        public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
+                access = protectify(access);
+                return super.visitField(access, name, desc, signature, value);
+        }
 
-                return c;
+        @Override
+        public void visitInnerClass(String name, String outerName, String innerName, int access) {
+                access = protectify(access);
+                super.visitInnerClass(name, outerName, innerName, access);
         }
 
-        private static int protectify(int flags) {
-                if (AccessFlag.isPrivate(flags)) {
-                        flags = AccessFlag.setProtected(flags);
+        private static int protectify(int access) {
+                AccessFlags accessFlags = new AccessFlags(access);
+                if (accessFlags.isPrivate()) {
+                        accessFlags.setProtected();
                 }
-                return flags;
+                return accessFlags.getFlags();
         }
 }
diff --git a/src/main/java/cuchaz/enigma/bytecode/ClassPublifier.java b/src/main/java/cuchaz/enigma/bytecode/ClassPublifier.java
index d627fe9..64de788 100644
--- a/src/main/java/cuchaz/enigma/bytecode/ClassPublifier.java
+++ b/src/main/java/cuchaz/enigma/bytecode/ClassPublifier.java
@@ -11,41 +11,45 @@
 
 package cuchaz.enigma.bytecode;
 
-import javassist.CtBehavior;
-import javassist.CtClass;
-import javassist.CtField;
-import javassist.bytecode.AccessFlag;
-import javassist.bytecode.InnerClassesAttribute;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.FieldVisitor;
+import org.objectweb.asm.MethodVisitor;
 
-public class ClassPublifier {
+public class ClassPublifier extends ClassVisitor {
 
-        public static CtClass publify(CtClass c) {
+        public ClassPublifier(int api, ClassVisitor cv) {
+                super(api, cv);
+        }
 
-                // publify all the fields
-                for (CtField field : c.getDeclaredFields()) {
-                        field.setModifiers(publify(field.getModifiers()));
-                }
+        @Override
+        public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
+                access = publify(access);
+                super.visit(version, access, name, signature, superName, interfaces);
+        }
 
-                // publify all the methods and constructors
-                for (CtBehavior behavior : c.getDeclaredBehaviors()) {
-                        behavior.setModifiers(publify(behavior.getModifiers()));
-                }
+        @Override
+        public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
+                access = publify(access);
+                return super.visitField(access, name, desc, signature, value);
+        }
 
-                // publify all the inner classes
-                InnerClassesAttribute attr = (InnerClassesAttribute) c.getClassFile().getAttribute(InnerClassesAttribute.tag);
-                if (attr != null) {
-                        for (int i = 0; i < attr.tableLength(); i++) {
-                                attr.setAccessFlags(i, publify(attr.accessFlags(i)));
-                        }
-                }
+        @Override
+        public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
+                access = publify(access);
+                return super.visitMethod(access, name, desc, signature, exceptions);
+        }
 
-                return c;
+        @Override
+        public void visitInnerClass(String name, String outerName, String innerName, int access) {
+                access = publify(access);
+                super.visitInnerClass(name, outerName, innerName, access);
         }
 
-        private static int publify(int flags) {
-                if (!AccessFlag.isPublic(flags)) {
-                        flags = AccessFlag.setPublic(flags);
+        private static int publify(int access) {
+                AccessFlags accessFlags = new AccessFlags(access);
+                if (!accessFlags.isPublic()) {
+                        accessFlags.setPublic();
                 }
-                return flags;
+                return accessFlags.getFlags();
         }
 }
diff --git a/src/main/java/cuchaz/enigma/bytecode/ClassRenamer.java b/src/main/java/cuchaz/enigma/bytecode/ClassRenamer.java
deleted file mode 100644
index 62a838d..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/ClassRenamer.java
+++ /dev/null
@@ -1,539 +0,0 @@
-/*******************************************************************************
- * 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.ClassEntry;
-import cuchaz.enigma.mapping.ClassNameReplacer;
-import cuchaz.enigma.mapping.Mappings;
-import cuchaz.enigma.mapping.Translator;
-import javassist.CtBehavior;
-import javassist.CtClass;
-import javassist.CtField;
-import javassist.Modifier;
-import javassist.bytecode.*;
-import javassist.bytecode.SignatureAttribute.*;
-
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.util.Arrays;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-public class ClassRenamer {
-
-        public static void applyModifier(Object obj, Mappings.EntryModifier modifier) {
-                int mod = -1;
-                if (obj instanceof CtField)
-                        mod = ((CtField) obj).getModifiers();
-                else if (obj instanceof CtBehavior)
-                        mod = ((CtBehavior) obj).getModifiers();
-                else if (obj instanceof CtClass)
-                        mod = ((CtClass) obj).getModifiers();
-
-                if (mod != -1) {
-                        switch (modifier) {
-                                case PRIVATE:
-                                        mod = Modifier.setPrivate(mod);
-                                        break;
-                                case PROTECTED:
-                                        mod = Modifier.setProtected(mod);
-                                        break;
-                                case PUBLIC:
-                                        mod = Modifier.setPublic(mod);
-                                        break;
-                                default:
-                                        break;
-                        }
-                        if (obj instanceof CtField)
-                                ((CtField) obj).setModifiers(mod);
-                        else if (obj instanceof CtBehavior)
-                                ((CtBehavior) obj).setModifiers(mod);
-                        else
-                                ((CtClass) obj).setModifiers(mod);
-                }
-        }
-
-        public static void renameClasses(CtClass c, final Translator translator) {
-                renameClasses(c, className -> {
-                        ClassEntry entry = translator.translateEntry(new ClassEntry(className));
-                        if (entry != null) {
-                                return entry.getName();
-                        }
-                        return null;
-                });
-        }
-
-        public static void moveAllClassesOutOfDefaultPackage(CtClass c, final String newPackageName) {
-                renameClasses(c, className -> {
-                        ClassEntry entry = new ClassEntry(className);
-                        if (entry.isInDefaultPackage()) {
-                                return newPackageName + "/" + entry.getName();
-                        }
-                        return null;
-                });
-        }
-
-        public static void moveAllClassesIntoDefaultPackage(CtClass c, final String oldPackageName) {
-                renameClasses(c, className -> {
-                        ClassEntry entry = new ClassEntry(className);
-                        if (entry.getPackageName().equals(oldPackageName)) {
-                                return entry.getSimpleName();
-                        }
-                        return null;
-                });
-        }
-
-        @SuppressWarnings("unchecked")
-        public static void renameClasses(CtClass c, ClassNameReplacer replacer) {
-
-                // sadly, we can't use CtClass.renameClass() because SignatureAttribute.renameClass() is extremely buggy =(
-
-                ReplacerClassMap map = new ReplacerClassMap(replacer);
-                ClassFile classFile = c.getClassFile();
-
-                // rename the constant pool (covers ClassInfo, MethodTypeInfo, and NameAndTypeInfo)
-                ConstPool constPool = c.getClassFile().getConstPool();
-                constPool.renameClass(map);
-
-                // rename class attributes
-                renameAttributes(classFile.getAttributes(), map, SignatureType.Class);
-
-                // rename methods
-                for (MethodInfo methodInfo : (List<MethodInfo>) classFile.getMethods()) {
-                        methodInfo.setDescriptor(Descriptor.rename(methodInfo.getDescriptor(), map));
-                        renameAttributes(methodInfo.getAttributes(), map, SignatureType.Method);
-                }
-
-                // rename fields
-                for (FieldInfo fieldInfo : (List<FieldInfo>) classFile.getFields()) {
-                        fieldInfo.setDescriptor(Descriptor.rename(fieldInfo.getDescriptor(), map));
-                        renameAttributes(fieldInfo.getAttributes(), map, SignatureType.Field);
-                }
-
-                // rename the class name itself last
-                // NOTE: don't use the map here, because setName() calls the buggy SignatureAttribute.renameClass()
-                // we only want to replace exactly this class name
-                String newName = renameClassName(c.getName(), map);
-                if (newName != null) {
-                        c.setName(newName);
-                }
-
-                // replace simple names in the InnerClasses attribute too
-                InnerClassesAttribute attr = (InnerClassesAttribute) c.getClassFile().getAttribute(InnerClassesAttribute.tag);
-                if (attr != null) {
-                        for (int i = 0; i < attr.tableLength(); i++) {
-
-                                String innerName = attr.innerClass(i);
-                                // get the inner class full name (which has already been translated)
-                                ClassEntry classEntry = new ClassEntry(Descriptor.toJvmName(innerName));
-
-                                if (attr.innerNameIndex(i) != 0) {
-                                        // update the inner name
-                                        attr.setInnerNameIndex(i, constPool.addUtf8Info(classEntry.getInnermostClassName()));
-                                }
-
-                                /* DEBUG
-                        System.out.println(String.format("\tDEOBF: %s-> ATTR: %s,%s,%s", classEntry, attr.outerClass(i), attr.innerClass(i), attr.innerName(i)));
-                                */
-                        }
-                }
-        }
-
-        @SuppressWarnings("unchecked")
-        private static void renameAttributes(List<AttributeInfo> attributes, ReplacerClassMap map, SignatureType type) {
-                try {
-
-                        // make the rename class method accessible
-                        Method renameClassMethod = AttributeInfo.class.getDeclaredMethod("renameClass", Map.class);
-                        renameClassMethod.setAccessible(true);
-
-                        for (AttributeInfo attribute : attributes) {
-                                if (attribute instanceof SignatureAttribute) {
-                                        // this has to be handled specially because SignatureAttribute.renameClass() is buggy as hell
-                                        SignatureAttribute signatureAttribute = (SignatureAttribute) attribute;
-                                        String newSignature = type.rename(signatureAttribute.getSignature(), map);
-                                        if (newSignature != null) {
-                                                signatureAttribute.setSignature(newSignature);
-                                        }
-                                } else if (attribute instanceof CodeAttribute) {
-                                        // code attributes have signature attributes too (indirectly)
-                                        CodeAttribute codeAttribute = (CodeAttribute) attribute;
-                                        renameAttributes(codeAttribute.getAttributes(), map, type);
-                                } else if (attribute instanceof LocalVariableTypeAttribute) {
-                                        // lvt attributes have signature attributes too
-                                        LocalVariableTypeAttribute localVariableAttribute = (LocalVariableTypeAttribute) attribute;
-                                        renameLocalVariableTypeAttribute(localVariableAttribute, map);
-                                } else {
-                                        renameClassMethod.invoke(attribute, map);
-                                }
-                        }
-
-                } catch (NoSuchMethodException | IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
-                        throw new Error("Unable to call javassist methods by reflection!", ex);
-                }
-        }
-
-        private static void renameLocalVariableTypeAttribute(LocalVariableTypeAttribute attribute, ReplacerClassMap map) {
-
-                // adapted from LocalVariableAttribute.renameClass()
-                ConstPool cp = attribute.getConstPool();
-                int n = attribute.tableLength();
-                byte[] info = attribute.get();
-                for (int i = 0; i < n; ++i) {
-                        int pos = i * 10 + 2;
-                        int index = ByteArray.readU16bit(info, pos + 6);
-                        if (index != 0) {
-                                String signature = cp.getUtf8Info(index);
-                                String newSignature = renameLocalVariableSignature(signature, map);
-                                if (newSignature != null) {
-                                        ByteArray.write16bit(cp.addUtf8Info(newSignature), info, pos + 6);
-                                }
-                        }
-                }
-        }
-
-        private static String renameLocalVariableSignature(String signature, ReplacerClassMap map) {
-
-                // for some reason, signatures with . in them don't count as field signatures
-                // looks like anonymous classes delimit with . in stead of $
-                // convert the . to $, but keep track of how many we replace
-                // we need to put them back after we translate
-                int start = signature.lastIndexOf('$') + 1;
-                int numConverted = 0;
-                StringBuilder buf = new StringBuilder(signature);
-                for (int i = buf.length() - 1; i >= start; i--) {
-                        char c = buf.charAt(i);
-                        if (c == '.') {
-                                buf.setCharAt(i, '$');
-                                numConverted++;
-                        }
-                }
-                signature = buf.toString();
-
-                // translate
-                String newSignature = renameFieldSignature(signature, map);
-                if (newSignature != null) {
-
-                        // put the delimiters back
-                        buf = new StringBuilder(newSignature);
-                        for (int i = buf.length() - 1; i >= 0 && numConverted > 0; i--) {
-                                char c = buf.charAt(i);
-                                if (c == '$') {
-                                        buf.setCharAt(i, '.');
-                                        numConverted--;
-                                }
-                        }
-                        assert (numConverted == 0);
-                        newSignature = buf.toString();
-
-                        return newSignature;
-                }
-
-                return null;
-        }
-
-        private static String renameClassSignature(String signature, ReplacerClassMap map) {
-                try {
-                        ClassSignature type = renameType(SignatureAttribute.toClassSignature(signature), map);
-                        return type.encode();
-                } catch (BadBytecode ex) {
-                        throw new Error("Can't parse field signature: " + signature);
-                }
-        }
-
-        private static String renameFieldSignature(String signature, ReplacerClassMap map) {
-                try {
-                        ObjectType type = renameType(SignatureAttribute.toFieldSignature(signature), map);
-                        if (type != null) {
-                                return type.encode();
-                        }
-                        return null;
-                } catch (BadBytecode ex) {
-                        throw new Error("Can't parse class signature: " + signature);
-                }
-        }
-
-        private static String renameMethodSignature(String signature, ReplacerClassMap map) {
-                try {
-                        MethodSignature type = renameType(SignatureAttribute.toMethodSignature(signature), map);
-                        return type.encode();
-                } catch (BadBytecode ex) {
-                        throw new Error("Can't parse method signature: " + signature);
-                }
-        }
-
-        private static TypeParameter[] renameTypeParameter(TypeParameter[] typeParamTypes, ReplacerClassMap map) {
-                if (typeParamTypes != null) {
-                        typeParamTypes = Arrays.copyOf(typeParamTypes, typeParamTypes.length);
-                        for (int i = 0; i < typeParamTypes.length; i++) {
-                                TypeParameter newParamType = renameType(typeParamTypes[i], map);
-                                if (newParamType != null) {
-                                        typeParamTypes[i] = newParamType;
-                                }
-                        }
-                }
-                return typeParamTypes;
-        }
-
-        private static ClassSignature renameType(ClassSignature type, ReplacerClassMap map) {
-
-                TypeParameter[] typeParamTypes = renameTypeParameter(type.getParameters(), map);
-
-                ClassType superclassType = type.getSuperClass();
-                if (superclassType != ClassType.OBJECT) {
-                        ClassType newSuperclassType = renameType(superclassType, map);
-                        if (newSuperclassType != null) {
-                                superclassType = newSuperclassType;
-                        }
-                }
-
-                ClassType[] interfaceTypes = type.getInterfaces();
-                if (interfaceTypes != null) {
-                        interfaceTypes = Arrays.copyOf(interfaceTypes, interfaceTypes.length);
-                        for (int i = 0; i < interfaceTypes.length; i++) {
-                                ClassType newInterfaceType = renameType(interfaceTypes[i], map);
-                                if (newInterfaceType != null) {
-                                        interfaceTypes[i] = newInterfaceType;
-                                }
-                        }
-                }
-
-                return new ClassSignature(typeParamTypes, superclassType, interfaceTypes);
-        }
-
-        private static MethodSignature renameType(MethodSignature type, ReplacerClassMap map) {
-
-                TypeParameter[] typeParamTypes = renameTypeParameter(type.getTypeParameters(), map);
-
-                Type[] paramTypes = type.getParameterTypes();
-                if (paramTypes != null) {
-                        paramTypes = Arrays.copyOf(paramTypes, paramTypes.length);
-                        for (int i = 0; i < paramTypes.length; i++) {
-                                Type newParamType = renameType(paramTypes[i], map);
-                                if (newParamType != null) {
-                                        paramTypes[i] = newParamType;
-                                }
-                        }
-                }
-
-                Type returnType = type.getReturnType();
-                if (returnType != null) {
-                        Type newReturnType = renameType(returnType, map);
-                        if (newReturnType != null) {
-                                returnType = newReturnType;
-                        }
-                }
-
-                ObjectType[] exceptionTypes = type.getExceptionTypes();
-                if (exceptionTypes != null) {
-                        exceptionTypes = Arrays.copyOf(exceptionTypes, exceptionTypes.length);
-                        for (int i = 0; i < exceptionTypes.length; i++) {
-                                ObjectType newExceptionType = renameType(exceptionTypes[i], map);
-                                if (newExceptionType != null) {
-                                        exceptionTypes[i] = newExceptionType;
-                                }
-                        }
-                }
-
-                return new MethodSignature(typeParamTypes, paramTypes, returnType, exceptionTypes);
-        }
-
-        private static Type renameType(Type type, ReplacerClassMap map) {
-                if (type instanceof ObjectType) {
-                        return renameType((ObjectType) type, map);
-                } else if (type instanceof BaseType) {
-                        return renameType((BaseType) type, map);
-                } else {
-                        throw new Error("Don't know how to rename type " + type.getClass());
-                }
-        }
-
-        private static ObjectType renameType(ObjectType type, ReplacerClassMap map) {
-                if (type instanceof ArrayType) {
-                        return renameType((ArrayType) type, map);
-                } else if (type instanceof ClassType) {
-                        return renameType((ClassType) type, map);
-                } else if (type instanceof TypeVariable) {
-                        return renameType((TypeVariable) type, map);
-                } else {
-                        throw new Error("Don't know how to rename type " + type.getClass());
-                }
-        }
-
-        private static BaseType renameType(BaseType type, ReplacerClassMap map) {
-                // don't have to rename primitives
-                return null;
-        }
-
-        private static TypeVariable renameType(TypeVariable type, ReplacerClassMap map) {
-                // don't have to rename template args
-                return null;
-        }
-
-        private static ClassType renameType(ClassType type, ReplacerClassMap map) {
-
-                // translate type args
-                TypeArgument[] args = type.getTypeArguments();
-                if (args != null) {
-                        args = Arrays.copyOf(args, args.length);
-                        for (int i = 0; i < args.length; i++) {
-                                TypeArgument newType = renameType(args[i], map);
-                                if (newType != null) {
-                                        args[i] = newType;
-                                }
-                        }
-                }
-
-                if (type instanceof NestedClassType) {
-                        NestedClassType nestedType = (NestedClassType) type;
-
-                        // translate the name
-                        String name = getClassName(type);
-                        String newName = map.get(name);
-                        if (newName != null) {
-                                name = new ClassEntry(newName).getInnermostClassName();
-                        }
-
-                        // translate the parent class too
-                        ClassType parent = renameType(nestedType.getDeclaringClass(), map);
-                        if (parent == null) {
-                                parent = nestedType.getDeclaringClass();
-                        }
-
-                        return new NestedClassType(parent, name, args);
-                } else {
-
-                        // translate the name
-                        String name = type.getName();
-                        String newName = renameClassName(name, map);
-                        if (newName != null) {
-                                name = newName;
-                        }
-
-                        return new ClassType(name, args);
-                }
-        }
-
-        private static String getClassName(ClassType type) {
-                if (type instanceof NestedClassType) {
-                        NestedClassType nestedType = (NestedClassType) type;
-                        return getClassName(nestedType.getDeclaringClass()) + "$" + Descriptor.toJvmName(type.getName().replace('.', '$'));
-                } else {
-                        return Descriptor.toJvmName(type.getName());
-                }
-        }
-
-        private static String renameClassName(String name, ReplacerClassMap map) {
-                String newName = map.get(Descriptor.toJvmName(name));
-                if (newName != null) {
-                        return Descriptor.toJavaName(newName);
-                }
-                return null;
-        }
-
-        private static TypeArgument renameType(TypeArgument type, ReplacerClassMap map) {
-                ObjectType subType = type.getType();
-                if (subType != null) {
-                        ObjectType newSubType = renameType(subType, map);
-                        if (newSubType != null) {
-                                switch (type.getKind()) {
-                                        case ' ':
-                                                return new TypeArgument(newSubType);
-                                        case '+':
-                                                return TypeArgument.subclassOf(newSubType);
-                                        case '-':
-                                                return TypeArgument.superOf(newSubType);
-                                        default:
-                                                throw new Error("Unknown type kind: " + type.getKind());
-                                }
-                        }
-                }
-                return null;
-        }
-
-        private static ArrayType renameType(ArrayType type, ReplacerClassMap map) {
-                Type newSubType = renameType(type.getComponentType(), map);
-                if (newSubType != null) {
-                        return new ArrayType(type.getDimension(), newSubType);
-                }
-                return null;
-        }
-
-        private static TypeParameter renameType(TypeParameter type, ReplacerClassMap map) {
-
-                ObjectType superclassType = type.getClassBound();
-                if (superclassType != null) {
-                        ObjectType newSuperclassType = renameType(superclassType, map);
-                        if (newSuperclassType != null) {
-                                superclassType = newSuperclassType;
-                        }
-                }
-
-                ObjectType[] interfaceTypes = type.getInterfaceBound();
-                if (interfaceTypes != null) {
-                        interfaceTypes = Arrays.copyOf(interfaceTypes, interfaceTypes.length);
-                        for (int i = 0; i < interfaceTypes.length; i++) {
-                                ObjectType newInterfaceType = renameType(interfaceTypes[i], map);
-                                if (newInterfaceType != null) {
-                                        interfaceTypes[i] = newInterfaceType;
-                                }
-                        }
-                }
-
-                return new TypeParameter(type.getName(), superclassType, interfaceTypes);
-        }
-
-        private enum SignatureType {
-                Class {
-                        @Override
-                        public String rename(String signature, ReplacerClassMap map) {
-                                return renameClassSignature(signature, map);
-                        }
-                },
-                Field {
-                        @Override
-                        public String rename(String signature, ReplacerClassMap map) {
-                                return renameFieldSignature(signature, map);
-                        }
-                },
-                Method {
-                        @Override
-                        public String rename(String signature, ReplacerClassMap map) {
-                                return renameMethodSignature(signature, map);
-                        }
-                };
-
-                public abstract String rename(String signature, ReplacerClassMap map);
-        }
-
-        private static class ReplacerClassMap extends HashMap<String, String> {
-
-                private ClassNameReplacer replacer;
-
-                public ReplacerClassMap(ClassNameReplacer replacer) {
-                        this.replacer = replacer;
-                }
-
-                @Override
-                public String get(Object obj) {
-                        if (obj instanceof String) {
-                                return get((String) obj);
-                        }
-                        return null;
-                }
-
-                public String get(String className) {
-                        return replacer.replace(className);
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/ConstPoolEditor.java b/src/main/java/cuchaz/enigma/bytecode/ConstPoolEditor.java
deleted file mode 100644
index 1932730..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/ConstPoolEditor.java
+++ /dev/null
@@ -1,264 +0,0 @@
-/*******************************************************************************
- * 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.bytecode.accessors.ClassInfoAccessor;
-import cuchaz.enigma.bytecode.accessors.ConstInfoAccessor;
-import cuchaz.enigma.bytecode.accessors.MemberRefInfoAccessor;
-import javassist.bytecode.ConstPool;
-import javassist.bytecode.Descriptor;
-
-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;
-
-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 static ConstPool readPool(DataInputStream in) {
-                try {
-                        return constructorPool.newInstance(in);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public static ConstPool newConstPool() {
-                // const pool expects the name of a class to initialize itself
-                // but we want an empty pool
-                // so give it a bogus name, and then clear the entries afterwards
-                ConstPool pool = new ConstPool("a");
-
-                ConstPoolEditor editor = new ConstPoolEditor(pool);
-                int size = pool.getSize();
-                for (int i = 0; i < size - 1; i++) {
-                        editor.removeLastItem();
-                }
-
-                // make sure the pool is actually empty
-                // although, in this case "empty" means one thing in it
-                // the JVM spec says index 0 should be reserved
-                assert (pool.getSize() == 1);
-                assert (editor.getItem(0) == null);
-                assert (editor.getItem(1) == null);
-                assert (editor.getItem(2) == null);
-                assert (editor.getItem(3) == null);
-
-                // also, clear the cache
-                editor.getCache().clear();
-
-                return pool;
-        }
-
-        public void writePool(DataOutputStream out) {
-                try {
-                        methodWritePool.invoke(this.pool, out);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        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);
-                }
-        }
-
-        public int addItem(Object item) {
-                try {
-                        return (Integer) addItem.invoke(this.pool, item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public int addItemForceNew(Object item) {
-                try {
-                        return (Integer) addItem0.invoke(this.pool, item);
-                } 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)));
-        }
-
-        @SuppressWarnings({ "rawtypes", "unchecked" })
-        public void changeClassName(int classNameIndex, String newName) {
-                // NOTE: when changing values, we always need to copy-on-write
-                try {
-                        // get the class item
-                        Object item = getItem(classNameIndex).getItem();
-
-                        // update the cache
-                        HashMap cache = getCache();
-                        if (cache != null) {
-                                cache.remove(item);
-                        }
-
-                        // add the new name and repoint the name-and-type to it
-                        new ClassInfoAccessor(item).setNameIndex(this.pool.addUtf8Info(newName));
-
-                        // update the cache
-                        if (cache != null) {
-                                cache.put(item, item);
-                        }
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public String dump() {
-                StringBuilder buf = new StringBuilder();
-                for (int i = 1; i < this.pool.getSize(); i++) {
-                        buf.append(String.format("%4d", i));
-                        buf.append("   ");
-                        buf.append(getItem(i));
-                        buf.append("\n");
-                }
-                return buf.toString();
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/InfoType.java b/src/main/java/cuchaz/enigma/bytecode/InfoType.java
deleted file mode 100644
index 9013d58..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/InfoType.java
+++ /dev/null
@@ -1,266 +0,0 @@
-/*******************************************************************************
- * 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 com.google.common.collect.Maps;
-import cuchaz.enigma.bytecode.accessors.*;
-
-import java.util.Collection;
-import java.util.Map;
-
-public enum InfoType {
-
-        Utf8Info(1),
-        IntegerInfo(3),
-        FloatInfo(4),
-        LongInfo(5),
-        DoubleInfo(6),
-        ClassInfo(7) {
-                @Override
-                public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                        ClassInfoAccessor accessor = new ClassInfoAccessor(entry.getItem());
-                        gatherIndexTree(indices, editor, accessor.getNameIndex());
-                }
-
-                @Override
-                public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                        ClassInfoAccessor accessor = new ClassInfoAccessor(entry.getItem());
-                        accessor.setNameIndex(remapIndex(map, accessor.getNameIndex()));
-                }
-
-                @Override
-                public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                        ClassInfoAccessor accessor = new ClassInfoAccessor(entry.getItem());
-                        ConstInfoAccessor nameEntry = pool.getItem(accessor.getNameIndex());
-                        return nameEntry != null && nameEntry.getTag() == Utf8Info.getTag();
-                }
-        },
-        StringInfo(8) {
-                @Override
-                public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                        StringInfoAccessor accessor = new StringInfoAccessor(entry.getItem());
-                        gatherIndexTree(indices, editor, accessor.getStringIndex());
-                }
-
-                @Override
-                public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                        StringInfoAccessor accessor = new StringInfoAccessor(entry.getItem());
-                        accessor.setStringIndex(remapIndex(map, accessor.getStringIndex()));
-                }
-
-                @Override
-                public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                        StringInfoAccessor accessor = new StringInfoAccessor(entry.getItem());
-                        ConstInfoAccessor stringEntry = pool.getItem(accessor.getStringIndex());
-                        return stringEntry != null && stringEntry.getTag() == Utf8Info.getTag();
-                }
-        },
-        FieldRefInfo(9) {
-                @Override
-                public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                        MemberRefInfoAccessor accessor = new MemberRefInfoAccessor(entry.getItem());
-                        gatherIndexTree(indices, editor, accessor.getClassIndex());
-                        gatherIndexTree(indices, editor, accessor.getNameAndTypeIndex());
-                }
-
-                @Override
-                public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                        MemberRefInfoAccessor accessor = new MemberRefInfoAccessor(entry.getItem());
-                        accessor.setClassIndex(remapIndex(map, accessor.getClassIndex()));
-                        accessor.setNameAndTypeIndex(remapIndex(map, accessor.getNameAndTypeIndex()));
-                }
-
-                @Override
-                public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                        MemberRefInfoAccessor accessor = new MemberRefInfoAccessor(entry.getItem());
-                        ConstInfoAccessor classEntry = pool.getItem(accessor.getClassIndex());
-                        ConstInfoAccessor nameAndTypeEntry = pool.getItem(accessor.getNameAndTypeIndex());
-                        return classEntry != null && classEntry.getTag() == ClassInfo.getTag() && nameAndTypeEntry != null && nameAndTypeEntry.getTag() == NameAndTypeInfo.getTag();
-                }
-        },
-        // same as FieldRefInfo
-        MethodRefInfo(10) {
-                @Override
-                public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                        FieldRefInfo.gatherIndexTree(indices, editor, entry);
-                }
-
-                @Override
-                public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                        FieldRefInfo.remapIndices(map, entry);
-                }
-
-                @Override
-                public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                        return FieldRefInfo.subIndicesAreValid(entry, pool);
-                }
-        },
-        // same as FieldRefInfo
-        InterfaceMethodRefInfo(11) {
-                @Override
-                public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                        FieldRefInfo.gatherIndexTree(indices, editor, entry);
-                }
-
-                @Override
-                public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                        FieldRefInfo.remapIndices(map, entry);
-                }
-
-                @Override
-                public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                        return FieldRefInfo.subIndicesAreValid(entry, pool);
-                }
-        },
-        NameAndTypeInfo(12) {
-                @Override
-                public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                        NameAndTypeInfoAccessor accessor = new NameAndTypeInfoAccessor(entry.getItem());
-                        gatherIndexTree(indices, editor, accessor.getNameIndex());
-                        gatherIndexTree(indices, editor, accessor.getTypeIndex());
-                }
-
-                @Override
-                public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                        NameAndTypeInfoAccessor accessor = new NameAndTypeInfoAccessor(entry.getItem());
-                        accessor.setNameIndex(remapIndex(map, accessor.getNameIndex()));
-                        accessor.setTypeIndex(remapIndex(map, accessor.getTypeIndex()));
-                }
-
-                @Override
-                public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                        NameAndTypeInfoAccessor accessor = new NameAndTypeInfoAccessor(entry.getItem());
-                        ConstInfoAccessor nameEntry = pool.getItem(accessor.getNameIndex());
-                        ConstInfoAccessor typeEntry = pool.getItem(accessor.getTypeIndex());
-                        return nameEntry != null && nameEntry.getTag() == Utf8Info.getTag() && typeEntry != null && typeEntry.getTag() == Utf8Info.getTag();
-                }
-        },
-        MethodHandleInfo(15) {
-                @Override
-                public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                        MethodHandleInfoAccessor accessor = new MethodHandleInfoAccessor(entry.getItem());
-                        gatherIndexTree(indices, editor, accessor.getTypeIndex());
-                        gatherIndexTree(indices, editor, accessor.getMethodRefIndex());
-                }
-
-                @Override
-                public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                        MethodHandleInfoAccessor accessor = new MethodHandleInfoAccessor(entry.getItem());
-                        accessor.setTypeIndex(remapIndex(map, accessor.getTypeIndex()));
-                        accessor.setMethodRefIndex(remapIndex(map, accessor.getMethodRefIndex()));
-                }
-
-                @Override
-                public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                        MethodHandleInfoAccessor accessor = new MethodHandleInfoAccessor(entry.getItem());
-                        ConstInfoAccessor typeEntry = pool.getItem(accessor.getTypeIndex());
-                        ConstInfoAccessor methodRefEntry = pool.getItem(accessor.getMethodRefIndex());
-                        return typeEntry != null && typeEntry.getTag() == Utf8Info.getTag() && methodRefEntry != null && methodRefEntry.getTag() == MethodRefInfo.getTag();
-                }
-        },
-        MethodTypeInfo(16) {
-                @Override
-                public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                        MethodTypeInfoAccessor accessor = new MethodTypeInfoAccessor(entry.getItem());
-                        gatherIndexTree(indices, editor, accessor.getTypeIndex());
-                }
-
-                @Override
-                public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                        MethodTypeInfoAccessor accessor = new MethodTypeInfoAccessor(entry.getItem());
-                        accessor.setTypeIndex(remapIndex(map, accessor.getTypeIndex()));
-                }
-
-                @Override
-                public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                        MethodTypeInfoAccessor accessor = new MethodTypeInfoAccessor(entry.getItem());
-                        ConstInfoAccessor typeEntry = pool.getItem(accessor.getTypeIndex());
-                        return typeEntry != null && typeEntry.getTag() == Utf8Info.getTag();
-                }
-        },
-        InvokeDynamicInfo(18) {
-                @Override
-                public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                        InvokeDynamicInfoAccessor accessor = new InvokeDynamicInfoAccessor(entry.getItem());
-                        gatherIndexTree(indices, editor, accessor.getBootstrapIndex());
-                        gatherIndexTree(indices, editor, accessor.getNameAndTypeIndex());
-                }
-
-                @Override
-                public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                        InvokeDynamicInfoAccessor accessor = new InvokeDynamicInfoAccessor(entry.getItem());
-                        accessor.setBootstrapIndex(remapIndex(map, accessor.getBootstrapIndex()));
-                        accessor.setNameAndTypeIndex(remapIndex(map, accessor.getNameAndTypeIndex()));
-                }
-
-                @Override
-                public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                        InvokeDynamicInfoAccessor accessor = new InvokeDynamicInfoAccessor(entry.getItem());
-                        ConstInfoAccessor bootstrapEntry = pool.getItem(accessor.getBootstrapIndex());
-                        ConstInfoAccessor nameAndTypeEntry = pool.getItem(accessor.getNameAndTypeIndex());
-                        return bootstrapEntry != null && bootstrapEntry.getTag() == Utf8Info.getTag() && nameAndTypeEntry != null && nameAndTypeEntry.getTag() == NameAndTypeInfo.getTag();
-                }
-        };
-
-        private static Map<Integer, InfoType> types;
-
-        static {
-                types = Maps.newTreeMap();
-                for (InfoType type : values()) {
-                        types.put(type.getTag(), type);
-                }
-        }
-
-        private int tag;
-
-        InfoType(int tag) {
-                this.tag = tag;
-        }
-
-        public static InfoType getByTag(int tag) {
-                return types.get(tag);
-        }
-
-        public static void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, int index) {
-                // add own index
-                indices.add(index);
-
-                // recurse
-                ConstInfoAccessor entry = editor.getItem(index);
-                entry.getType().gatherIndexTree(indices, editor, entry);
-        }
-
-        private static int remapIndex(Map<Integer, Integer> map, int index) {
-                Integer newIndex = map.get(index);
-                if (newIndex == null) {
-                        newIndex = index;
-                }
-                return newIndex;
-        }
-
-        public int getTag() {
-                return this.tag;
-        }
-
-        public void gatherIndexTree(Collection<Integer> indices, ConstPoolEditor editor, ConstInfoAccessor entry) {
-                // by default, do nothing
-        }
-
-        public void remapIndices(Map<Integer, Integer> map, ConstInfoAccessor entry) {
-                // by default, do nothing
-        }
-
-        public boolean subIndicesAreValid(ConstInfoAccessor entry, ConstPoolEditor pool) {
-                // by default, everything is good
-                return true;
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/MethodParametersAttribute.java b/src/main/java/cuchaz/enigma/bytecode/MethodParametersAttribute.java
deleted file mode 100644
index 3f819ab..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/MethodParametersAttribute.java
+++ /dev/null
@@ -1,87 +0,0 @@
-/*******************************************************************************
- * 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 javassist.bytecode.AttributeInfo;
-import javassist.bytecode.ConstPool;
-import javassist.bytecode.MethodInfo;
-
-import java.io.ByteArrayOutputStream;
-import java.io.DataOutputStream;
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.List;
-
-public class MethodParametersAttribute extends AttributeInfo {
-
-        private MethodParametersAttribute(ConstPool pool, List<Integer> parameterNameIndices) {
-                super(pool, "MethodParameters", writeStruct(parameterNameIndices));
-        }
-
-        public static void updateClass(MethodInfo info, List<String> names) {
-
-                // add the names to the class const pool
-                ConstPool constPool = info.getConstPool();
-                List<Integer> parameterNameIndices = new ArrayList<>();
-                for (String name : names) {
-                        if (name != null) {
-                                parameterNameIndices.add(constPool.addUtf8Info(name));
-                        } else {
-                                parameterNameIndices.add(0);
-                        }
-                }
-
-                // add the attribute to the method
-                info.addAttribute(new MethodParametersAttribute(constPool, parameterNameIndices));
-        }
-
-        private static byte[] writeStruct(List<Integer> parameterNameIndices) {
-                // JVM 8 Spec says the struct looks like this:
-                // http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.24
-                // uint8 num_params
-                // for each param:
-                // uint16 name_index -> points to UTF8 entry in constant pool, or 0 for no entry
-                // uint16 access_flags -> don't care, just set to 0
-
-                ByteArrayOutputStream buf = new ByteArrayOutputStream();
-                DataOutputStream out = new DataOutputStream(buf);
-
-                // NOTE: java hates unsigned integers, so we have to be careful here
-                // the writeShort(), writeByte() methods will read 16,8 low-order bits from the int argument
-                // as long as the int argument is in range of the unsigned short/byte type, it will be written as an unsigned short/byte
-                // if the int is out of range, the byte stream won't look the way we want and weird things will happen
-                final int SIZEOF_UINT8 = 1;
-                final int SIZEOF_UINT16 = 2;
-                final int MAX_UINT8 = (1 << 8) - 1;
-                final int MAX_UINT16 = (1 << 16) - 1;
-
-                try {
-                        assert (parameterNameIndices.size() >= 0 && parameterNameIndices.size() <= MAX_UINT8);
-                        out.writeByte(parameterNameIndices.size());
-
-                        for (Integer index : parameterNameIndices) {
-                                assert (index >= 0 && index <= MAX_UINT16);
-                                out.writeShort(index);
-
-                                // just write 0 for the access flags
-                                out.writeShort(0);
-                        }
-
-                        out.close();
-                        byte[] data = buf.toByteArray();
-                        assert (data.length == SIZEOF_UINT8 + parameterNameIndices.size() * (SIZEOF_UINT16 + SIZEOF_UINT16));
-                        return data;
-                } catch (IOException ex) {
-                        throw new Error(ex);
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/accessors/ClassInfoAccessor.java b/src/main/java/cuchaz/enigma/bytecode/accessors/ClassInfoAccessor.java
deleted file mode 100644
index eaa6e90..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/accessors/ClassInfoAccessor.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*******************************************************************************
- * 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.accessors;
-
-import java.lang.reflect.Field;
-
-public class ClassInfoAccessor {
-
-        private static Class<?> clazz;
-        private static Field nameIndex;
-
-        static {
-                try {
-                        clazz = Class.forName("javassist.bytecode.ClassInfo");
-                        nameIndex = clazz.getDeclaredField("name");
-                        nameIndex.setAccessible(true);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        private Object item;
-
-        public ClassInfoAccessor(Object item) {
-                this.item = item;
-        }
-
-        public static boolean isType(ConstInfoAccessor accessor) {
-                return clazz.isAssignableFrom(accessor.getItem().getClass());
-        }
-
-        public int getNameIndex() {
-                try {
-                        return (Integer) nameIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setNameIndex(int val) {
-                try {
-                        nameIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/accessors/ConstInfoAccessor.java b/src/main/java/cuchaz/enigma/bytecode/accessors/ConstInfoAccessor.java
deleted file mode 100644
index 27d991a..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/accessors/ConstInfoAccessor.java
+++ /dev/null
@@ -1,124 +0,0 @@
-/*******************************************************************************
- * 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.accessors;
-
-import com.google.common.base.Charsets;
-import cuchaz.enigma.bytecode.InfoType;
-
-import java.io.*;
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-
-public class ConstInfoAccessor {
-
-        private static Class<?> clazz;
-        private static Field index;
-        private static Method getTag;
-
-        static {
-                try {
-                        clazz = Class.forName("javassist.bytecode.ConstInfo");
-                        index = clazz.getDeclaredField("index");
-                        index.setAccessible(true);
-                        getTag = clazz.getMethod("getTag");
-                        getTag.setAccessible(true);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        private Object item;
-
-        public ConstInfoAccessor(Object item) {
-                if (item == null) {
-                        throw new IllegalArgumentException("item cannot be null!");
-                }
-                this.item = item;
-        }
-
-        public Object getItem() {
-                return this.item;
-        }
-
-        public int getIndex() {
-                try {
-                        return (Integer) index.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public int getTag() {
-                try {
-                        return (Integer) getTag.invoke(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public ConstInfoAccessor copy() {
-                return new ConstInfoAccessor(copyItem());
-        }
-
-        public Object copyItem() {
-                // I don't know of a simpler way to copy one of these silly things...
-                try {
-                        // serialize the item
-                        ByteArrayOutputStream buf = new ByteArrayOutputStream();
-                        DataOutputStream out = new DataOutputStream(buf);
-                        write(out);
-
-                        // deserialize the item
-                        DataInputStream in = new DataInputStream(new ByteArrayInputStream(buf.toByteArray()));
-                        Object item = new ConstInfoAccessor(in).getItem();
-                        in.close();
-
-                        return item;
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void write(DataOutputStream out) throws IOException {
-                try {
-                        out.writeUTF(this.item.getClass().getName());
-                        out.writeInt(getIndex());
-
-                        Method method = this.item.getClass().getMethod("write", DataOutputStream.class);
-                        method.setAccessible(true);
-                        method.invoke(this.item, out);
-                } catch (IOException ex) {
-                        throw ex;
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        @Override
-        public String toString() {
-                try {
-                        ByteArrayOutputStream buf = new ByteArrayOutputStream();
-                        PrintWriter out = new PrintWriter(new OutputStreamWriter(buf, Charsets.UTF_8));
-                        Method print = this.item.getClass().getMethod("print", PrintWriter.class);
-                        print.setAccessible(true);
-                        print.invoke(this.item, out);
-                        out.close();
-                        return buf.toString("UTF-8").replace("\n", "");
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public InfoType getType() {
-                return InfoType.getByTag(getTag());
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/accessors/InvokeDynamicInfoAccessor.java b/src/main/java/cuchaz/enigma/bytecode/accessors/InvokeDynamicInfoAccessor.java
deleted file mode 100644
index aef3532..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/accessors/InvokeDynamicInfoAccessor.java
+++ /dev/null
@@ -1,75 +0,0 @@
-/*******************************************************************************
- * 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.accessors;
-
-import java.lang.reflect.Field;
-
-public class InvokeDynamicInfoAccessor {
-
-        private static Class<?> clazz;
-        private static Field bootstrapIndex;
-        private static Field nameAndTypeIndex;
-
-        static {
-                try {
-                        clazz = Class.forName("javassist.bytecode.InvokeDynamicInfo");
-                        bootstrapIndex = clazz.getDeclaredField("bootstrap");
-                        bootstrapIndex.setAccessible(true);
-                        nameAndTypeIndex = clazz.getDeclaredField("nameAndType");
-                        nameAndTypeIndex.setAccessible(true);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        private Object item;
-
-        public InvokeDynamicInfoAccessor(Object item) {
-                this.item = item;
-        }
-
-        public static boolean isType(ConstInfoAccessor accessor) {
-                return clazz.isAssignableFrom(accessor.getItem().getClass());
-        }
-
-        public int getBootstrapIndex() {
-                try {
-                        return (Integer) bootstrapIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setBootstrapIndex(int val) {
-                try {
-                        bootstrapIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public int getNameAndTypeIndex() {
-                try {
-                        return (Integer) nameAndTypeIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setNameAndTypeIndex(int val) {
-                try {
-                        nameAndTypeIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/accessors/MemberRefInfoAccessor.java b/src/main/java/cuchaz/enigma/bytecode/accessors/MemberRefInfoAccessor.java
deleted file mode 100644
index 058bb45..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/accessors/MemberRefInfoAccessor.java
+++ /dev/null
@@ -1,75 +0,0 @@
-/*******************************************************************************
- * 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.accessors;
-
-import java.lang.reflect.Field;
-
-public class MemberRefInfoAccessor {
-
-        private static Class<?> clazz;
-        private static Field classIndex;
-        private static Field nameAndTypeIndex;
-
-        static {
-                try {
-                        clazz = Class.forName("javassist.bytecode.MemberrefInfo");
-                        classIndex = clazz.getDeclaredField("classIndex");
-                        classIndex.setAccessible(true);
-                        nameAndTypeIndex = clazz.getDeclaredField("nameAndTypeIndex");
-                        nameAndTypeIndex.setAccessible(true);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        private Object item;
-
-        public MemberRefInfoAccessor(Object item) {
-                this.item = item;
-        }
-
-        public static boolean isType(ConstInfoAccessor accessor) {
-                return clazz.isAssignableFrom(accessor.getItem().getClass());
-        }
-
-        public int getClassIndex() {
-                try {
-                        return (Integer) classIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setClassIndex(int val) {
-                try {
-                        classIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public int getNameAndTypeIndex() {
-                try {
-                        return (Integer) nameAndTypeIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setNameAndTypeIndex(int val) {
-                try {
-                        nameAndTypeIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/accessors/MethodHandleInfoAccessor.java b/src/main/java/cuchaz/enigma/bytecode/accessors/MethodHandleInfoAccessor.java
deleted file mode 100644
index 985e792..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/accessors/MethodHandleInfoAccessor.java
+++ /dev/null
@@ -1,75 +0,0 @@
-/*******************************************************************************
- * 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.accessors;
-
-import java.lang.reflect.Field;
-
-public class MethodHandleInfoAccessor {
-
-        private static Class<?> clazz;
-        private static Field kindIndex;
-        private static Field indexIndex;
-
-        static {
-                try {
-                        clazz = Class.forName("javassist.bytecode.MethodHandleInfo");
-                        kindIndex = clazz.getDeclaredField("refKind");
-                        kindIndex.setAccessible(true);
-                        indexIndex = clazz.getDeclaredField("refIndex");
-                        indexIndex.setAccessible(true);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        private Object item;
-
-        public MethodHandleInfoAccessor(Object item) {
-                this.item = item;
-        }
-
-        public static boolean isType(ConstInfoAccessor accessor) {
-                return clazz.isAssignableFrom(accessor.getItem().getClass());
-        }
-
-        public int getTypeIndex() {
-                try {
-                        return (Integer) kindIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setTypeIndex(int val) {
-                try {
-                        kindIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public int getMethodRefIndex() {
-                try {
-                        return (Integer) indexIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setMethodRefIndex(int val) {
-                try {
-                        indexIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/accessors/MethodTypeInfoAccessor.java b/src/main/java/cuchaz/enigma/bytecode/accessors/MethodTypeInfoAccessor.java
deleted file mode 100644
index 10b0cb0..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/accessors/MethodTypeInfoAccessor.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*******************************************************************************
- * 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.accessors;
-
-import java.lang.reflect.Field;
-
-public class MethodTypeInfoAccessor {
-
-        private static Class<?> clazz;
-        private static Field descriptorIndex;
-
-        static {
-                try {
-                        clazz = Class.forName("javassist.bytecode.MethodTypeInfo");
-                        descriptorIndex = clazz.getDeclaredField("descriptor");
-                        descriptorIndex.setAccessible(true);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        private Object item;
-
-        public MethodTypeInfoAccessor(Object item) {
-                this.item = item;
-        }
-
-        public static boolean isType(ConstInfoAccessor accessor) {
-                return clazz.isAssignableFrom(accessor.getItem().getClass());
-        }
-
-        public int getTypeIndex() {
-                try {
-                        return (Integer) descriptorIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setTypeIndex(int val) {
-                try {
-                        descriptorIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/accessors/NameAndTypeInfoAccessor.java b/src/main/java/cuchaz/enigma/bytecode/accessors/NameAndTypeInfoAccessor.java
deleted file mode 100644
index cc7fdbe..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/accessors/NameAndTypeInfoAccessor.java
+++ /dev/null
@@ -1,75 +0,0 @@
-/*******************************************************************************
- * 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.accessors;
-
-import java.lang.reflect.Field;
-
-public class NameAndTypeInfoAccessor {
-
-        private static Class<?> clazz;
-        private static Field nameIndex;
-        private static Field typeIndex;
-
-        static {
-                try {
-                        clazz = Class.forName("javassist.bytecode.NameAndTypeInfo");
-                        nameIndex = clazz.getDeclaredField("memberName");
-                        nameIndex.setAccessible(true);
-                        typeIndex = clazz.getDeclaredField("typeDescriptor");
-                        typeIndex.setAccessible(true);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        private Object item;
-
-        public NameAndTypeInfoAccessor(Object item) {
-                this.item = item;
-        }
-
-        public static boolean isType(ConstInfoAccessor accessor) {
-                return clazz.isAssignableFrom(accessor.getItem().getClass());
-        }
-
-        public int getNameIndex() {
-                try {
-                        return (Integer) nameIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setNameIndex(int val) {
-                try {
-                        nameIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public int getTypeIndex() {
-                try {
-                        return (Integer) typeIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setTypeIndex(int val) {
-                try {
-                        typeIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/accessors/StringInfoAccessor.java b/src/main/java/cuchaz/enigma/bytecode/accessors/StringInfoAccessor.java
deleted file mode 100644
index 5c68d4a..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/accessors/StringInfoAccessor.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*******************************************************************************
- * 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.accessors;
-
-import java.lang.reflect.Field;
-
-public class StringInfoAccessor {
-
-        private static Class<?> clazz;
-        private static Field stringIndex;
-
-        static {
-                try {
-                        clazz = Class.forName("javassist.bytecode.StringInfo");
-                        stringIndex = clazz.getDeclaredField("string");
-                        stringIndex.setAccessible(true);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        private Object item;
-
-        public StringInfoAccessor(Object item) {
-                this.item = item;
-        }
-
-        public static boolean isType(ConstInfoAccessor accessor) {
-                return clazz.isAssignableFrom(accessor.getItem().getClass());
-        }
-
-        public int getStringIndex() {
-                try {
-                        return (Integer) stringIndex.get(this.item);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public void setStringIndex(int val) {
-                try {
-                        stringIndex.set(this.item, val);
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/accessors/Utf8InfoAccessor.java b/src/main/java/cuchaz/enigma/bytecode/accessors/Utf8InfoAccessor.java
deleted file mode 100644
index cc3b41b..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/accessors/Utf8InfoAccessor.java
+++ /dev/null
@@ -1,29 +0,0 @@
-/*******************************************************************************
- * 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.accessors;
-
-public class Utf8InfoAccessor {
-
-        private static Class<?> clazz;
-
-        static {
-                try {
-                        clazz = Class.forName("javassist.bytecode.Utf8Info");
-                } catch (Exception ex) {
-                        throw new Error(ex);
-                }
-        }
-
-        public static boolean isType(ConstInfoAccessor accessor) {
-                return clazz.isAssignableFrom(accessor.getItem().getClass());
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/translators/ClassTranslator.java b/src/main/java/cuchaz/enigma/bytecode/translators/ClassTranslator.java
deleted file mode 100644
index 4ac5a8b..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/translators/ClassTranslator.java
+++ /dev/null
@@ -1,161 +0,0 @@
-/*******************************************************************************
- * 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.translators;
-
-import cuchaz.enigma.bytecode.ClassRenamer;
-import cuchaz.enigma.bytecode.ConstPoolEditor;
-import cuchaz.enigma.mapping.*;
-import javassist.CtBehavior;
-import javassist.CtClass;
-import javassist.CtField;
-import javassist.CtMethod;
-import javassist.bytecode.*;
-
-public class ClassTranslator {
-
-        public static void translate(Translator translator, 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 = 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 = translator.translateEntry(entry);
-                                        if (!entry.equals(translatedEntry)) {
-                                                editor.changeMemberrefNameAndType(i, translatedEntry.getName(), translatedEntry.getSignature().toString());
-                                        }
-                                }
-                                break;
-                                default:
-                                        break;
-                        }
-                }
-
-                ClassEntry classEntry = new ClassEntry(Descriptor.toJvmName(c.getName()));
-                Mappings.EntryModifier modifier = translator.getModifier(classEntry);
-                if (modifier != null && modifier != Mappings.EntryModifier.UNCHANGED)
-                        ClassRenamer.applyModifier(c, modifier);
-
-                // translate all the fields
-                for (CtField field : c.getDeclaredFields()) {
-
-                        // translate the name
-                        FieldEntry entry = EntryFactory.getFieldEntry(field);
-                        String translatedName = translator.translate(entry);
-                        modifier = translator.getModifier(entry);
-                        if (modifier != null && modifier != Mappings.EntryModifier.UNCHANGED)
-                                ClassRenamer.applyModifier(field, modifier);
-
-                        if (translatedName != null) {
-                                field.setName(translatedName);
-                        }
-
-                        // translate the type
-                        Type translatedType = 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);
-
-                        modifier = translator.getModifier(entry);
-                        if (modifier != null && modifier != Mappings.EntryModifier.UNCHANGED)
-                                ClassRenamer.applyModifier(behavior, modifier);
-
-                        if (behavior instanceof CtMethod) {
-                                CtMethod method = (CtMethod) behavior;
-
-                                // translate the name
-                                String translatedName = translator.translate(entry);
-                                if (translatedName != null) {
-                                        method.setName(translatedName);
-                                }
-                        }
-
-                        if (entry.getSignature() != null) {
-                                // translate the signature
-                                Signature translatedSignature = 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 = 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 = 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, translator);
-
-                // translate the source file attribute too
-                ClassEntry deobfClassEntry = translator.translateEntry(classEntry);
-                if (deobfClassEntry != null) {
-                        String sourceFile = Descriptor.toJvmName(deobfClassEntry.getOutermostClassEntry().getSimpleName()) + ".java";
-                        c.getClassFile().addAttribute(new SourceFileAttribute(constants, sourceFile));
-                }
-                InnerClassesAttribute attr = (InnerClassesAttribute) c.getClassFile().getAttribute(InnerClassesAttribute.tag);
-                if (attr != null)
-                        InnerClassWriter.changeModifier(c, attr, translator);
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/translators/InnerClassWriter.java b/src/main/java/cuchaz/enigma/bytecode/translators/InnerClassWriter.java
deleted file mode 100644
index 0e35938..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/translators/InnerClassWriter.java
+++ /dev/null
@@ -1,144 +0,0 @@
-/*******************************************************************************
- * 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.translators;
-
-import com.google.common.collect.Lists;
-import cuchaz.enigma.analysis.JarIndex;
-import cuchaz.enigma.bytecode.ClassRenamer;
-import cuchaz.enigma.mapping.*;
-import javassist.ClassPool;
-import javassist.CtClass;
-import javassist.NotFoundException;
-import javassist.bytecode.*;
-
-import java.util.Collection;
-import java.util.List;
-
-public class InnerClassWriter {
-
-        // FIXME: modifier is not applied to inner class
-        public static void changeModifier(CtClass c, InnerClassesAttribute attr, Translator translator) {
-                ClassPool pool = c.getClassPool();
-                for (int i = 0; i < attr.tableLength(); i++) {
-
-                        String innerName = attr.innerClass(i);
-                        // get the inner class full name (which has already been translated)
-                        ClassEntry classEntry = new ClassEntry(Descriptor.toJvmName(innerName));
-                        try {
-                                CtClass innerClass = pool.get(innerName);
-                                Mappings.EntryModifier modifier = translator.getModifier(classEntry);
-                                if (modifier != null && modifier != Mappings.EntryModifier.UNCHANGED)
-                                        ClassRenamer.applyModifier(innerClass, modifier);
-                        } catch (NotFoundException e) {
-                                // This shouldn't be possible in theory
-                                //e.printStackTrace();
-                        }
-                }
-        }
-
-        public static void write(JarIndex index, CtClass c) {
-
-                // don't change anything if there's already an attribute there
-                InnerClassesAttribute oldAttr = (InnerClassesAttribute) c.getClassFile().getAttribute(InnerClassesAttribute.tag);
-                if (oldAttr != null) {
-                        // bail!
-                        return;
-                }
-
-                ClassEntry obfClassEntry = EntryFactory.getClassEntry(c);
-                List<ClassEntry> obfClassChain = index.getObfClassChain(obfClassEntry);
-
-                boolean isInnerClass = obfClassChain.size() > 1;
-                if (isInnerClass) {
-
-                        // it's an inner class, rename it to the fully qualified name
-                        c.setName(obfClassEntry.buildClassEntry(obfClassChain).getName());
-
-                        BehaviorEntry caller = index.getAnonymousClassCaller(obfClassEntry);
-                        if (caller != null) {
-
-                                // write the enclosing method attribute
-                                if (caller.getName().equals("<clinit>")) {
-                                        c.getClassFile().addAttribute(new EnclosingMethodAttribute(c.getClassFile().getConstPool(), caller.getClassName()));
-                                } else {
-                                        c.getClassFile().addAttribute(new EnclosingMethodAttribute(c.getClassFile().getConstPool(), caller.getClassName(), caller.getName(), caller.getSignature().toString()));
-                                }
-                        }
-                }
-
-                // does this class have any inner classes?
-                Collection<ClassEntry> obfInnerClassEntries = index.getInnerClasses(obfClassEntry);
-
-                if (isInnerClass || !obfInnerClassEntries.isEmpty()) {
-
-                        // create an inner class attribute
-                        InnerClassesAttribute attr = new InnerClassesAttribute(c.getClassFile().getConstPool());
-                        c.getClassFile().addAttribute(attr);
-
-                        // write the ancestry, but not the outermost class
-                        for (int i = 1; i < obfClassChain.size(); i++) {
-                                ClassEntry obfInnerClassEntry = obfClassChain.get(i);
-                                writeInnerClass(index, attr, obfClassChain, obfInnerClassEntry);
-
-                                // update references to use the fully qualified inner class name
-                                c.replaceClassName(obfInnerClassEntry.getName(), obfInnerClassEntry.buildClassEntry(obfClassChain).getName());
-                        }
-
-                        // write the inner classes
-                        for (ClassEntry obfInnerClassEntry : obfInnerClassEntries) {
-
-                                // extend the class chain
-                                List<ClassEntry> extendedObfClassChain = Lists.newArrayList(obfClassChain);
-                                extendedObfClassChain.add(obfInnerClassEntry);
-
-                                writeInnerClass(index, attr, extendedObfClassChain, obfInnerClassEntry);
-
-                                // update references to use the fully qualified inner class name
-                                c.replaceClassName(obfInnerClassEntry.getName(), obfInnerClassEntry.buildClassEntry(extendedObfClassChain).getName());
-                        }
-                }
-        }
-
-        private static void writeInnerClass(JarIndex index, InnerClassesAttribute attr, List<ClassEntry> obfClassChain, ClassEntry obfClassEntry) {
-
-                // get the new inner class name
-                ClassEntry obfInnerClassEntry = obfClassEntry.buildClassEntry(obfClassChain);
-                ClassEntry obfOuterClassEntry = obfInnerClassEntry.getOuterClassEntry();
-
-                // here's what the JVM spec says about the InnerClasses attribute
-                // append(inner, parent, 0 if anonymous else simple name, flags);
-
-                // update the attribute with this inner class
-                ConstPool constPool = attr.getConstPool();
-                int innerClassIndex = constPool.addClassInfo(obfInnerClassEntry.getName());
-                int parentClassIndex = constPool.addClassInfo(obfOuterClassEntry.getName());
-                int innerClassNameIndex = 0;
-                int accessFlags = AccessFlag.PUBLIC;
-                // TODO: need to figure out if we can put static or not
-                if (!index.isAnonymousClass(obfClassEntry)) {
-                        innerClassNameIndex = constPool.addUtf8Info(obfInnerClassEntry.getInnermostClassName());
-                }
-
-                attr.append(innerClassIndex, parentClassIndex, innerClassNameIndex, accessFlags);
-
-                /* DEBUG 
-                System.out.println(String.format("\tOBF: %s -> ATTR: %s,%s,%s (replace %s with %s)",
-                        obfClassEntry,
-                        attr.innerClass(attr.tableLength() - 1),
-                        attr.outerClass(attr.tableLength() - 1),
-                        attr.innerName(attr.tableLength() - 1),
-                        Constants.NonePackage + "/" + obfInnerClassName,
-                        obfClassEntry.getName()
-                ));
-                */
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/translators/LocalVariableTranslator.java b/src/main/java/cuchaz/enigma/bytecode/translators/LocalVariableTranslator.java
deleted file mode 100644
index 51b3d2d..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/translators/LocalVariableTranslator.java
+++ /dev/null
@@ -1,142 +0,0 @@
-/*******************************************************************************
- * 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.translators;
-
-import cuchaz.enigma.mapping.*;
-import javassist.CtBehavior;
-import javassist.CtClass;
-import javassist.bytecode.*;
-
-public class LocalVariableTranslator {
-
-        public static void translate(Translator translator, CtClass c) {
-                for (CtBehavior behavior : c.getDeclaredBehaviors()) {
-
-                        // if there's a local variable table, just rename everything to v1, v2, v3, ... for now
-                        CodeAttribute codeAttribute = behavior.getMethodInfo().getCodeAttribute();
-                        if (codeAttribute == null) {
-                                continue;
-                        }
-
-                        BehaviorEntry behaviorEntry = EntryFactory.getBehaviorEntry(behavior);
-                        ConstPool constants = c.getClassFile().getConstPool();
-
-                        LocalVariableAttribute table = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
-                        if (table != null) {
-                                renameLVT(translator, behaviorEntry, constants, table, c);
-                        }
-
-                        LocalVariableTypeAttribute typeTable = (LocalVariableTypeAttribute) codeAttribute.getAttribute(LocalVariableAttribute.typeTag);
-                        if (typeTable != null) {
-                                renameLVTT(typeTable, table);
-                        }
-                }
-        }
-
-        // DEBUG
-        @SuppressWarnings("unused")
-        private static void dumpTable(LocalVariableAttribute table) {
-                for (int i = 0; i < table.tableLength(); i++) {
-                        System.out.println(String.format("\t%d (%d): %s %s",
-                                i, table.index(i), table.variableName(i), table.descriptor(i)
-                        ));
-                }
-        }
-
-        private static void renameLVT(Translator translator, BehaviorEntry behaviorEntry, ConstPool constants, LocalVariableAttribute table, CtClass ctClass) {
-
-                // skip empty tables
-                if (table.tableLength() <= 0) {
-                        return;
-                }
-
-                // where do we start counting variables?
-                int starti = 0;
-                if (table.variableName(0).equals("this")) {
-                        // skip the "this" variable
-                        starti++;
-                }
-
-                // rename method arguments first
-                int numArgs = 0;
-                if (behaviorEntry.getSignature() != null) {
-                        numArgs = behaviorEntry.getSignature().getArgumentTypes().size();
-                        boolean isNestedClassConstructor = false;
-
-                        // If the behavior is a constructor and if it have more than one arg, it's probably from a nested!
-                        if (behaviorEntry instanceof ConstructorEntry && behaviorEntry.getClassEntry() != null && behaviorEntry.getClassEntry().isInnerClass() && numArgs >= 1) {
-                                // Get the first arg type
-                                Type firstArg = behaviorEntry.getSignature().getArgumentTypes().get(0);
-
-                                // If the arg is a class and if the class name match the outer class name of the constructor, it's definitely a constructor of a nested class
-                                if (firstArg.isClass() && firstArg.getClassEntry().equals(behaviorEntry.getClassEntry().getOuterClassEntry())) {
-                                        isNestedClassConstructor = true;
-                                        numArgs--;
-                                }
-                        }
-
-                        for (int i = starti; i < starti + numArgs && i < table.tableLength(); i++) {
-                                int argi = i - starti;
-                                if (ctClass.isEnum())
-                                        argi += 2;
-                                String argName = translator.translate(new ArgumentEntry(behaviorEntry, argi, ""));
-                                if (argName == null) {
-                                        int argIndex = isNestedClassConstructor ? argi + 1 : argi;
-                                        if (ctClass.isEnum())
-                                                argIndex -= 2;
-                                        Type argType = behaviorEntry.getSignature().getArgumentTypes().get(argIndex);
-                                        // Unfortunately each of these have different name getters, so they have different code paths
-                                        if (argType.isPrimitive()) {
-                                                Type.Primitive argCls = argType.getPrimitive();
-                                                argName = "a" + argCls.name() + (argIndex + 1);
-                                        } else if (argType.isArray()) {
-                                                // List types would require this whole block again, so just go with aListx
-                                                argName = "aList" + (argIndex + 1);
-                                        } else if (argType.isClass()) {
-                                                ClassEntry argClsTrans = translator.translateEntry(argType.getClassEntry());
-                                                argName = "a" + argClsTrans.getSimpleName().replace("$", "") + (argIndex + 1);
-                                        } else {
-                                                argName = "a" + (argIndex + 1);
-                                        }
-                                }
-                                renameVariable(table, i, constants.addUtf8Info(argName));
-                        }
-                }
-
-                // then rename the rest of the args, if any
-                for (int i = starti + numArgs; i < table.tableLength(); i++) {
-                        int firstIndex = Math.min(table.index(starti + numArgs), table.index(i));
-                        renameVariable(table, i, constants.addUtf8Info("v" + (table.index(i) - firstIndex + 1)));
-                }
-        }
-
-        private static void renameLVTT(LocalVariableTypeAttribute typeTable, LocalVariableAttribute table) {
-                // rename args to the same names as in the LVT
-                for (int i = 0; i < typeTable.tableLength(); i++) {
-                        renameVariable(typeTable, i, getNameIndex(table, typeTable.index(i)));
-                }
-        }
-
-        private static void renameVariable(LocalVariableAttribute table, int i, int stringId) {
-                // based off of LocalVariableAttribute.nameIndex()
-                ByteArray.write16bit(stringId, table.get(), i * 10 + 6);
-        }
-
-        private static int getNameIndex(LocalVariableAttribute table, int index) {
-                for (int i = 0; i < table.tableLength(); i++) {
-                        if (table.index(i) == index) {
-                                return table.nameIndex(i);
-                        }
-                }
-                return 0;
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/translators/MethodParameterTranslator.java b/src/main/java/cuchaz/enigma/bytecode/translators/MethodParameterTranslator.java
deleted file mode 100644
index 4e632b9..0000000
--- a/src/main/java/cuchaz/enigma/bytecode/translators/MethodParameterTranslator.java
+++ /dev/null
@@ -1,62 +0,0 @@
-/*******************************************************************************
- * 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.translators;
-
-import cuchaz.enigma.bytecode.MethodParametersAttribute;
-import cuchaz.enigma.mapping.*;
-import javassist.CtBehavior;
-import javassist.CtClass;
-import javassist.bytecode.CodeAttribute;
-import javassist.bytecode.LocalVariableAttribute;
-
-import java.util.ArrayList;
-import java.util.List;
-
-public class MethodParameterTranslator {
-
-        public static void translate(Translator translator, CtClass c) {
-
-                // Procyon will read method arguments from the "MethodParameters" attribute, so write those
-                for (CtBehavior behavior : c.getDeclaredBehaviors()) {
-
-                        // if there's a local variable table here, don't write a MethodParameters attribute
-                        // let the local variable writer deal with it instead
-                        // procyon starts doing really weird things if we give it both attributes
-                        CodeAttribute codeAttribute = behavior.getMethodInfo().getCodeAttribute();
-                        if (codeAttribute != null && codeAttribute.getAttribute(LocalVariableAttribute.tag) != null) {
-                                continue;
-                        }
-
-                        BehaviorEntry behaviorEntry = EntryFactory.getBehaviorEntry(behavior);
-
-                        // get the number of arguments
-                        Signature signature = behaviorEntry.getSignature();
-                        if (signature == null) {
-                                // static initializers have no signatures, or arguments
-                                continue;
-                        }
-                        int numParams = signature.getArgumentTypes().size();
-                        if (numParams <= 0) {
-                                continue;
-                        }
-
-                        // get the list of argument names
-                        List<String> names = new ArrayList<>(numParams);
-                        for (int i = 0; i < numParams; i++) {
-                                names.add(translator.translate(new ArgumentEntry(behaviorEntry, i, "")));
-                        }
-
-                        // save the mappings to the class
-                        MethodParametersAttribute.updateClass(behavior.getMethodInfo(), names);
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/bytecode/translators/TranslationClassVisitor.java b/src/main/java/cuchaz/enigma/bytecode/translators/TranslationClassVisitor.java
new file mode 100644
index 0000000..24bfe24
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/bytecode/translators/TranslationClassVisitor.java
@@ -0,0 +1,106 @@
+/*******************************************************************************
+ * 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.translators;
+
+import cuchaz.enigma.analysis.JarIndex;
+import cuchaz.enigma.bytecode.AccessFlags;
+import cuchaz.enigma.mapping.*;
+import org.objectweb.asm.*;
+
+import java.util.regex.Pattern;
+
+public class TranslationClassVisitor extends ClassVisitor {
+        private static final Pattern OBJECT_PATTERN = Pattern.compile(".*:Ljava/lang/Object;:.*");
+
+        private final Translator translator;
+        private final JarIndex jarIndex;
+        private final ReferencedEntryPool entryPool;
+
+        private ClassDefEntry obfClassEntry;
+
+        public TranslationClassVisitor(Translator translator, JarIndex jarIndex, ReferencedEntryPool entryPool, int api, ClassVisitor cv) {
+                super(api, cv);
+                this.translator = translator;
+                this.jarIndex = jarIndex;
+                this.entryPool = entryPool;
+        }
+
+        @Override
+        public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
+                if (signature != null && OBJECT_PATTERN.matcher(signature).matches()) {
+                        signature = signature.replaceAll(":Ljava/lang/Object;:", "::");
+                }
+                obfClassEntry = new ClassDefEntry(name, new AccessFlags(access));
+                ClassDefEntry entry = translator.getTranslatedClassDef(obfClassEntry);
+                ClassEntry superEntry = translator.getTranslatedClass(entryPool.getClass(superName));
+                String[] translatedInterfaces = new String[interfaces.length];
+                for (int i = 0; i < interfaces.length; i++) {
+                        translatedInterfaces[i] = translator.getTranslatedClass(entryPool.getClass(interfaces[i])).getName();
+                }
+                super.visit(version, entry.getAccess().getFlags(), entry.getName(), signature, superEntry.getName(), translatedInterfaces);
+        }
+
+        @Override
+        public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
+                FieldDefEntry entry = new FieldDefEntry(obfClassEntry, name, new TypeDescriptor(desc), new AccessFlags(access));
+                FieldDefEntry translatedEntry = translator.getTranslatedFieldDef(entry);
+                return super.visitField(translatedEntry.getAccess().getFlags(), translatedEntry.getName(), translatedEntry.getDesc().toString(), signature, value);
+        }
+
+        @Override
+        public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
+                MethodDefEntry entry = new MethodDefEntry(obfClassEntry, name, new MethodDescriptor(desc), new AccessFlags(access));
+                MethodDefEntry translatedEntry = translator.getTranslatedMethodDef(entry);
+                if (jarIndex.getBridgedMethod(entry) != null) {
+                        translatedEntry.getAccess().setBridged();
+                }
+                MethodVisitor mv = super.visitMethod(translatedEntry.getAccess().getFlags(), name, desc, signature, exceptions);
+                return new TranslationMethodVisitor(translator, translatedEntry, api, mv);
+        }
+
+        @Override
+        public void visitOuterClass(String owner, String name, String desc) {
+                if (name != null) {
+                        ClassEntry ownerEntry = translator.getTranslatedClass(entryPool.getClass(owner));
+                        ClassEntry entry = translator.getTranslatedClass(entryPool.getClass(name));
+                        String translatedDesc = translator.getTranslatedTypeDesc(new TypeDescriptor(desc)).toString();
+                        super.visitOuterClass(ownerEntry.getName(), entry.getName(), translatedDesc);
+                } else {
+                        super.visitOuterClass(owner, name, desc);
+                }
+        }
+
+        @Override
+        public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
+                // TODO: Implement
+                return super.visitAnnotation(desc, visible);
+        }
+
+        @Override
+        public AnnotationVisitor visitTypeAnnotation(int typeRef, TypePath typePath, String desc, boolean visible) {
+                // TODO: Implement
+                return super.visitTypeAnnotation(typeRef, typePath, desc, visible);
+        }
+
+        @Override
+        public void visitInnerClass(String name, String outerName, String innerName, int access) {
+                // If this is not an anonymous class
+                if (innerName != null && outerName != null) {
+                        ClassDefEntry translatedEntry = translator.getTranslatedClassDef(new ClassDefEntry(innerName, new AccessFlags(access)));
+                        ClassEntry outerEntry = translator.getTranslatedClass(entryPool.getClass(outerName));
+                        ClassEntry innerEntry = translator.getTranslatedClass(entryPool.getClass(innerName));
+                        super.visitInnerClass(translatedEntry.getName(), outerEntry.getName(), innerEntry.getName(), translatedEntry.getAccess().getFlags());
+                } else {
+                        super.visitInnerClass(name, outerName, innerName, access);
+                }
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/bytecode/translators/TranslationMethodVisitor.java b/src/main/java/cuchaz/enigma/bytecode/translators/TranslationMethodVisitor.java
new file mode 100644
index 0000000..e40becc
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/bytecode/translators/TranslationMethodVisitor.java
@@ -0,0 +1,82 @@
+package cuchaz.enigma.bytecode.translators;
+
+import cuchaz.enigma.mapping.*;
+import org.objectweb.asm.*;
+
+import java.util.Locale;
+
+public class TranslationMethodVisitor extends MethodVisitor {
+        private final MethodDefEntry methodEntry;
+        private final Translator translator;
+
+        public TranslationMethodVisitor(Translator translator, MethodDefEntry methodEntry, int api, MethodVisitor mv) {
+                super(api, mv);
+                this.translator = translator;
+                this.methodEntry = methodEntry;
+        }
+
+        @Override
+        public void visitFieldInsn(int opcode, String owner, String name, String desc) {
+                FieldEntry entry = new FieldEntry(new ClassEntry(owner), name, new TypeDescriptor(desc));
+                FieldEntry translatedEntry = translator.getTranslatedField(entry);
+                if (translatedEntry != null) {
+                        super.visitFieldInsn(opcode, translatedEntry.getClassName(), translatedEntry.getName(), translatedEntry.getDesc().toString());
+                } else {
+                        super.visitFieldInsn(opcode, owner, name, desc);
+                }
+        }
+
+        @Override
+        public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean itf) {
+                MethodEntry entry = new MethodEntry(new ClassEntry(owner), name, new MethodDescriptor(desc));
+                MethodEntry translatedEntry = translator.getTranslatedMethod(entry);
+                if (translatedEntry != null) {
+                        super.visitMethodInsn(opcode, translatedEntry.getClassName(), translatedEntry.getName(), translatedEntry.getDesc().toString(), itf);
+                } else {
+                        super.visitMethodInsn(opcode, owner, name, desc, itf);
+                }
+        }
+
+        @Override
+        public void visitAttribute(Attribute attr) {
+                // TODO: Implement
+                super.visitAttribute(attr);
+        }
+
+        @Override
+        public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
+                // TODO: Implement
+                return super.visitAnnotation(desc, visible);
+        }
+
+        @Override
+        public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) {
+                LocalVariableDefEntry entry = new LocalVariableDefEntry(methodEntry, index, name, new TypeDescriptor(desc));
+                LocalVariableDefEntry translatedEntry = translator.getTranslatedVariableDef(entry);
+                String translatedName = translatedEntry.getName();
+                // TODO: Better name inference
+                if (translatedName.equals(entry.getName())) {
+                        TypeDescriptor argDesc = translatedEntry.getDesc();
+                        int nameIndex = translatedEntry.getNamedIndex() + 1;
+                        String prefix = translatedEntry.getNamedIndex() < methodEntry.getDesc().getArgumentDescs().size() ? "a" : "v";
+                        StringBuilder nameBuilder = new StringBuilder(prefix);
+                        // Unfortunately each of these have different name getters, so they have different code paths
+                        if (argDesc.isPrimitive()) {
+                                TypeDescriptor.Primitive argCls = argDesc.getPrimitive();
+                                nameBuilder.append(argCls.name());
+                        } else if (argDesc.isArray()) {
+                                // List types would require this whole block again, so just go with aListx
+                                nameBuilder.append(nameIndex);
+                        } else if (argDesc.isType()) {
+                                String typeName = argDesc.getOwnerEntry().getSimpleName().replace("$", "");
+                                typeName = typeName.substring(0, 1).toUpperCase(Locale.ROOT) + typeName.substring(1);
+                                nameBuilder.append(typeName);
+                        }
+                        if (methodEntry.getDesc().getArgumentDescs().size() > 1) {
+                                nameBuilder.append(nameIndex);
+                        }
+                        translatedName = nameBuilder.toString();
+                }
+                super.visitLocalVariable(translatedName, translatedEntry.getDesc().toString(), signature, start, end, index);
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/gui/CodeReader.java b/src/main/java/cuchaz/enigma/gui/CodeReader.java
index f76dc89..97deaf3 100644
--- a/src/main/java/cuchaz/enigma/gui/CodeReader.java
+++ b/src/main/java/cuchaz/enigma/gui/CodeReader.java
@@ -162,7 +162,7 @@ public class CodeReader extends JEditorPane {
                         // couldn't find the class declaration token, might be an anonymous class
                         // look for any declaration in that class instead
                         for (Entry entry : sourceIndex.declarations()) {
-                                if (entry.getClassEntry().equals(classEntry)) {
+                                if (entry.getOwnerClassEntry().equals(classEntry)) {
                                         token = sourceIndex.getDeclarationToken(entry);
                                         break;
                                 }
diff --git a/src/main/java/cuchaz/enigma/gui/Gui.java b/src/main/java/cuchaz/enigma/gui/Gui.java
index 4a891cf..5d9f7cb 100644
--- a/src/main/java/cuchaz/enigma/gui/Gui.java
+++ b/src/main/java/cuchaz/enigma/gui/Gui.java
@@ -35,7 +35,6 @@ import cuchaz.enigma.mapping.*;
 import cuchaz.enigma.throwables.IllegalNameException;
 import cuchaz.enigma.utils.Utils;
 import de.sciss.syntaxpane.DefaultSyntaxKit;
-import javassist.bytecode.Descriptor;
 
 import javax.swing.*;
 import javax.swing.text.BadLocationException;
@@ -48,8 +47,10 @@ import java.awt.*;
 import java.awt.event.*;
 import java.io.File;
 import java.io.IOException;
-import java.util.*;
+import java.util.Collection;
+import java.util.Collections;
 import java.util.List;
+import java.util.Vector;
 import java.util.function.Function;
 
 public class Gui {
@@ -438,14 +439,10 @@ public class Gui {
                         showFieldEntry((FieldEntry) this.reference.entry);
                 } else if (this.reference.entry instanceof MethodEntry) {
                         showMethodEntry((MethodEntry) this.reference.entry);
-                } else if (this.reference.entry instanceof ConstructorEntry) {
-                        showConstructorEntry((ConstructorEntry) this.reference.entry);
-                } else if (this.reference.entry instanceof ArgumentEntry) {
-                        showArgumentEntry((ArgumentEntry) this.reference.entry);
                 } else if (this.reference.entry instanceof LocalVariableEntry) {
                         showLocalVariableEntry((LocalVariableEntry) this.reference.entry);
                 } else {
-                        throw new Error("Unknown entry type: " + this.reference.entry.getClass().getName());
+                        throw new Error("Unknown entry desc: " + this.reference.entry.getClass().getName());
                 }
 
                 redraw();
@@ -453,10 +450,9 @@ public class Gui {
 
         private void showLocalVariableEntry(LocalVariableEntry entry) {
                 addNameValue(infoPanel, "Variable", entry.getName());
-                addNameValue(infoPanel, "Class", entry.getClassEntry().getName());
-                addNameValue(infoPanel, "Method", entry.getBehaviorEntry().getName());
+                addNameValue(infoPanel, "Class", entry.getOwnerClassEntry().getName());
+                addNameValue(infoPanel, "Method", entry.getOwnerEntry().getName());
                 addNameValue(infoPanel, "Index", Integer.toString(entry.getIndex()));
-                addNameValue(infoPanel, "Type", entry.getType().toString());
         }
 
         private void showClassEntry(ClassEntry entry) {
@@ -466,32 +462,20 @@ public class Gui {
 
         private void showFieldEntry(FieldEntry entry) {
                 addNameValue(infoPanel, "Field", entry.getName());
-                addNameValue(infoPanel, "Class", entry.getClassEntry().getName());
-                addNameValue(infoPanel, "Type", entry.getType().toString());
+                addNameValue(infoPanel, "Class", entry.getOwnerClassEntry().getName());
+                addNameValue(infoPanel, "TypeDescriptor", entry.getDesc().toString());
                 addModifierComboBox(infoPanel, "Modifier", entry);
         }
 
         private void showMethodEntry(MethodEntry entry) {
-                addNameValue(infoPanel, "Method", entry.getName());
-                addNameValue(infoPanel, "Class", entry.getClassEntry().getName());
-                addNameValue(infoPanel, "Signature", entry.getSignature().toString());
-                addModifierComboBox(infoPanel, "Modifier", entry);
-
-        }
-
-        private void showConstructorEntry(ConstructorEntry entry) {
-                addNameValue(infoPanel, "Constructor", entry.getClassEntry().getName());
-                if (!entry.isStatic()) {
-                        addNameValue(infoPanel, "Signature", entry.getSignature().toString());
-                        addModifierComboBox(infoPanel, "Modifier", entry);
+                if (entry.isConstructor()) {
+                        addNameValue(infoPanel, "Constructor", entry.getOwnerClassEntry().getName());
+                } else {
+                        addNameValue(infoPanel, "Method", entry.getName());
+                        addNameValue(infoPanel, "Class", entry.getOwnerClassEntry().getName());
                 }
-        }
-
-        private void showArgumentEntry(ArgumentEntry entry) {
-                addNameValue(infoPanel, "Argument", entry.getName());
-                addNameValue(infoPanel, "Class", entry.getClassEntry().getName());
-                addNameValue(infoPanel, "Method", entry.getBehaviorEntry().getName());
-                addNameValue(infoPanel, "Index", Integer.toString(entry.getIndex()));
+                addNameValue(infoPanel, "MethodDescriptor", entry.getDesc().toString());
+                addModifierComboBox(infoPanel, "Modifier", entry);
         }
 
         private void addNameValue(JPanel container, String name, String value) {
@@ -532,8 +516,8 @@ public class Gui {
                 reference = this.controller.getDeobfReference(token);
                 boolean isClassEntry = isToken && reference.entry instanceof ClassEntry;
                 boolean isFieldEntry = isToken && reference.entry instanceof FieldEntry;
-                boolean isMethodEntry = isToken && reference.entry instanceof MethodEntry;
-                boolean isConstructorEntry = isToken && reference.entry instanceof ConstructorEntry;
+                boolean isMethodEntry = isToken && reference.entry instanceof MethodEntry && !((MethodEntry) reference.entry).isConstructor();
+                boolean isConstructorEntry = isToken && reference.entry instanceof MethodEntry && ((MethodEntry) reference.entry).isConstructor();
                 boolean isInJar = isToken && this.controller.entryIsInJar(reference.entry);
                 boolean isRenameable = isToken && this.controller.referenceIsRenameable(reference);
 
@@ -710,16 +694,13 @@ public class Gui {
                 if (reference.entry instanceof ClassEntry) {
                         // look for calls to the default constructor
                         // TODO: get a list of all the constructors and find calls to all of them
-                        BehaviorReferenceTreeNode node = this.controller.getMethodReferences(new ConstructorEntry((ClassEntry) reference.entry, new Signature("()V")));
+                        MethodReferenceTreeNode node = this.controller.getMethodReferences(new MethodEntry((ClassEntry) reference.entry, "<init>", new MethodDescriptor("()V")));
                         callsTree.setModel(new DefaultTreeModel(node));
                 } else if (reference.entry instanceof FieldEntry) {
                         FieldReferenceTreeNode node = this.controller.getFieldReferences((FieldEntry) reference.entry);
                         callsTree.setModel(new DefaultTreeModel(node));
                 } else if (reference.entry instanceof MethodEntry) {
-                        BehaviorReferenceTreeNode node = this.controller.getMethodReferences((MethodEntry) reference.entry);
-                        callsTree.setModel(new DefaultTreeModel(node));
-                } else if (reference.entry instanceof ConstructorEntry) {
-                        BehaviorReferenceTreeNode node = this.controller.getMethodReferences((ConstructorEntry) reference.entry);
+                        MethodReferenceTreeNode node = this.controller.getMethodReferences((MethodEntry) reference.entry);
                         callsTree.setModel(new DefaultTreeModel(node));
                 }
 
@@ -790,7 +771,6 @@ public class Gui {
                 // package rename
                 if (data instanceof String) {
                         for (int i = 0; i < node.getChildCount(); i++) {
-                                data = Descriptor.toJvmName((String) data);
                                 DefaultMutableTreeNode childNode = (DefaultMutableTreeNode) node.getChildAt(i);
                                 ClassEntry prevDataChild = (ClassEntry) childNode.getUserObject();
                                 ClassEntry dataChild = new ClassEntry(data + "/" + prevDataChild.getSimpleName());
@@ -807,15 +787,15 @@ public class Gui {
         }
 
         public void moveClassTree(EntryReference<Entry, Entry> deobfReference, String newName) {
-                String oldEntry = deobfReference.entry.getClassEntry().getPackageName();
-                String newEntry = new ClassEntry(Descriptor.toJvmName(newName)).getPackageName();
+                String oldEntry = deobfReference.entry.getOwnerClassEntry().getPackageName();
+                String newEntry = new ClassEntry(newName).getPackageName();
                 moveClassTree(deobfReference, newName, oldEntry == null,
                         newEntry == null);
         }
 
         public void moveClassTree(EntryReference<Entry, Entry> deobfReference, String newName, boolean isOldOb, boolean isNewOb) {
-                ClassEntry oldEntry = deobfReference.entry.getClassEntry();
-                ClassEntry newEntry = new ClassEntry(Descriptor.toJvmName(newName));
+                ClassEntry oldEntry = deobfReference.entry.getOwnerClassEntry();
+                ClassEntry newEntry = new ClassEntry(newName);
 
                 // Ob -> deob
                 if (isOldOb && !isNewOb) {
diff --git a/src/main/java/cuchaz/enigma/gui/GuiController.java b/src/main/java/cuchaz/enigma/gui/GuiController.java
index 6d98743..a5528a7 100644
--- a/src/main/java/cuchaz/enigma/gui/GuiController.java
+++ b/src/main/java/cuchaz/enigma/gui/GuiController.java
@@ -51,7 +51,7 @@ public class GuiController {
                 return this.isDirty;
         }
 
-        public void openJar(final JarFile jar) {
+        public void openJar(final JarFile jar) throws IOException {
                 this.gui.onStartOpenJar();
                 this.deobfuscator = new Deobfuscator(jar);
                 this.gui.onFinishOpenJar(this.deobfuscator.getJarName());
@@ -161,24 +161,24 @@ public class GuiController {
 
         public ClassInheritanceTreeNode getClassInheritance(ClassEntry deobfClassEntry) {
                 ClassEntry obfClassEntry = this.deobfuscator.obfuscateEntry(deobfClassEntry);
-                ClassInheritanceTreeNode rootNode = this.deobfuscator.getJarIndex().getClassInheritance(this.deobfuscator.getTranslator(TranslationDirection.Deobfuscating), obfClassEntry);
+                ClassInheritanceTreeNode rootNode = this.deobfuscator.getJarIndex().getClassInheritance(this.deobfuscator.getTranslator(TranslationDirection.DEOBFUSCATING), obfClassEntry);
                 return ClassInheritanceTreeNode.findNode(rootNode, obfClassEntry);
         }
 
         public ClassImplementationsTreeNode getClassImplementations(ClassEntry deobfClassEntry) {
                 ClassEntry obfClassEntry = this.deobfuscator.obfuscateEntry(deobfClassEntry);
-                return this.deobfuscator.getJarIndex().getClassImplementations(this.deobfuscator.getTranslator(TranslationDirection.Deobfuscating), obfClassEntry);
+                return this.deobfuscator.getJarIndex().getClassImplementations(this.deobfuscator.getTranslator(TranslationDirection.DEOBFUSCATING), obfClassEntry);
         }
 
         public MethodInheritanceTreeNode getMethodInheritance(MethodEntry deobfMethodEntry) {
                 MethodEntry obfMethodEntry = this.deobfuscator.obfuscateEntry(deobfMethodEntry);
-                MethodInheritanceTreeNode rootNode = this.deobfuscator.getJarIndex().getMethodInheritance(this.deobfuscator.getTranslator(TranslationDirection.Deobfuscating), obfMethodEntry);
+                MethodInheritanceTreeNode rootNode = this.deobfuscator.getJarIndex().getMethodInheritance(this.deobfuscator.getTranslator(TranslationDirection.DEOBFUSCATING), obfMethodEntry);
                 return MethodInheritanceTreeNode.findNode(rootNode, obfMethodEntry);
         }
 
         public MethodImplementationsTreeNode getMethodImplementations(MethodEntry deobfMethodEntry) {
                 MethodEntry obfMethodEntry = this.deobfuscator.obfuscateEntry(deobfMethodEntry);
-                List<MethodImplementationsTreeNode> rootNodes = this.deobfuscator.getJarIndex().getMethodImplementations(this.deobfuscator.getTranslator(TranslationDirection.Deobfuscating), obfMethodEntry);
+                List<MethodImplementationsTreeNode> rootNodes = this.deobfuscator.getJarIndex().getMethodImplementations(this.deobfuscator.getTranslator(TranslationDirection.DEOBFUSCATING), obfMethodEntry);
                 if (rootNodes.isEmpty()) {
                         return null;
                 }
@@ -190,14 +190,14 @@ public class GuiController {
 
         public FieldReferenceTreeNode getFieldReferences(FieldEntry deobfFieldEntry) {
                 FieldEntry obfFieldEntry = this.deobfuscator.obfuscateEntry(deobfFieldEntry);
-                FieldReferenceTreeNode rootNode = new FieldReferenceTreeNode(this.deobfuscator.getTranslator(TranslationDirection.Deobfuscating), obfFieldEntry);
+                FieldReferenceTreeNode rootNode = new FieldReferenceTreeNode(this.deobfuscator.getTranslator(TranslationDirection.DEOBFUSCATING), obfFieldEntry);
                 rootNode.load(this.deobfuscator.getJarIndex(), true);
                 return rootNode;
         }
 
-        public BehaviorReferenceTreeNode getMethodReferences(BehaviorEntry deobfBehaviorEntry) {
-                BehaviorEntry obfBehaviorEntry = this.deobfuscator.obfuscateEntry(deobfBehaviorEntry);
-                BehaviorReferenceTreeNode rootNode = new BehaviorReferenceTreeNode(this.deobfuscator.getTranslator(TranslationDirection.Deobfuscating), obfBehaviorEntry);
+        public MethodReferenceTreeNode getMethodReferences(MethodEntry deobfMethodEntry) {
+                MethodEntry obfMethodEntry = this.deobfuscator.obfuscateEntry(deobfMethodEntry);
+                MethodReferenceTreeNode rootNode = new MethodReferenceTreeNode(this.deobfuscator.getTranslator(TranslationDirection.DEOBFUSCATING), obfMethodEntry);
                 rootNode.load(this.deobfuscator.getJarIndex(), true);
                 return rootNode;
         }
diff --git a/src/main/java/cuchaz/enigma/gui/node/ClassSelectorPackageNode.java b/src/main/java/cuchaz/enigma/gui/node/ClassSelectorPackageNode.java
index f80abba..caa985c 100644
--- a/src/main/java/cuchaz/enigma/gui/node/ClassSelectorPackageNode.java
+++ b/src/main/java/cuchaz/enigma/gui/node/ClassSelectorPackageNode.java
@@ -11,8 +11,6 @@
 
 package cuchaz.enigma.gui.node;
 
-import javassist.bytecode.Descriptor;
-
 import javax.swing.tree.DefaultMutableTreeNode;
 
 public class ClassSelectorPackageNode extends DefaultMutableTreeNode {
@@ -41,7 +39,7 @@ public class ClassSelectorPackageNode extends DefaultMutableTreeNode {
 
         @Override
         public String toString() {
-                return !packageName.equals("(none)") ? Descriptor.toJavaName(this.packageName) : "(none)";
+                return !packageName.equals("(none)") ? this.packageName : "(none)";
         }
 
         @Override
diff --git a/src/main/java/cuchaz/enigma/mapping/ArgumentEntry.java b/src/main/java/cuchaz/enigma/mapping/ArgumentEntry.java
deleted file mode 100644
index 9154cc2..0000000
--- a/src/main/java/cuchaz/enigma/mapping/ArgumentEntry.java
+++ /dev/null
@@ -1,110 +0,0 @@
-/*******************************************************************************
- * 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.mapping;
-
-import cuchaz.enigma.utils.Utils;
-
-public class ArgumentEntry implements Entry {
-
-        private BehaviorEntry behaviorEntry;
-        private int index;
-        private String name;
-
-        public ArgumentEntry(BehaviorEntry behaviorEntry, int index, String name) {
-                if (behaviorEntry == null) {
-                        throw new IllegalArgumentException("Behavior cannot be null!");
-                }
-                if (index < 0) {
-                        throw new IllegalArgumentException("Index must be non-negative!");
-                }
-                if (name == null) {
-                        throw new IllegalArgumentException("Argument name cannot be null!");
-                }
-
-                this.behaviorEntry = behaviorEntry;
-                this.index = index;
-                this.name = name;
-        }
-
-        public ArgumentEntry(ArgumentEntry other) {
-                this.behaviorEntry = other.getBehaviorEntry();
-                this.index = other.index;
-                this.name = other.name;
-        }
-
-        public ArgumentEntry(ArgumentEntry other, String newClassName) {
-                this.behaviorEntry = (BehaviorEntry) other.behaviorEntry.cloneToNewClass(new ClassEntry(newClassName));
-                this.index = other.index;
-                this.name = other.name;
-        }
-
-        public ArgumentEntry(ArgumentEntry other, BehaviorEntry entry) {
-                this.behaviorEntry = entry;
-                this.index = other.index;
-                this.name = other.name;
-        }
-
-        public BehaviorEntry getBehaviorEntry() {
-                return this.behaviorEntry;
-        }
-
-        public int getIndex() {
-                return this.index;
-        }
-
-        @Override
-        public String getName() {
-                return this.name;
-        }
-
-        @Override
-        public ClassEntry getClassEntry() {
-                return this.behaviorEntry.getClassEntry();
-        }
-
-        @Override
-        public String getClassName() {
-                return this.behaviorEntry.getClassName();
-        }
-
-        @Override
-        public ArgumentEntry cloneToNewClass(ClassEntry classEntry) {
-                return new ArgumentEntry(this, classEntry.getName());
-        }
-
-        public String getMethodName() {
-                return this.behaviorEntry.getName();
-        }
-
-        public Signature getMethodSignature() {
-                return this.behaviorEntry.getSignature();
-        }
-
-        @Override
-        public int hashCode() {
-                return Utils.combineHashesOrdered(this.behaviorEntry, Integer.valueOf(this.index).hashCode(), this.name.hashCode());
-        }
-
-        @Override
-        public boolean equals(Object other) {
-                return other instanceof ArgumentEntry && equals((ArgumentEntry) other);
-        }
-
-        public boolean equals(ArgumentEntry other) {
-                return this.behaviorEntry.equals(other.behaviorEntry) && this.index == other.index && this.name.equals(other.name);
-        }
-
-        @Override
-        public String toString() {
-                return this.behaviorEntry + "(" + this.index + ":" + this.name + ")";
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/mapping/BehaviorEntry.java b/src/main/java/cuchaz/enigma/mapping/ClassDefEntry.java
index 04b4ebc..dc1b02e 100644
--- a/src/main/java/cuchaz/enigma/mapping/BehaviorEntry.java
+++ b/src/main/java/cuchaz/enigma/mapping/ClassDefEntry.java
@@ -11,6 +11,19 @@
 
 package cuchaz.enigma.mapping;
 
-public interface BehaviorEntry extends Entry {
-        Signature getSignature();
+import com.google.common.base.Preconditions;
+import cuchaz.enigma.bytecode.AccessFlags;
+
+public class ClassDefEntry extends ClassEntry {
+        private final AccessFlags access;
+
+        public ClassDefEntry(String className, AccessFlags access) {
+                super(className);
+                Preconditions.checkNotNull(access, "Class access cannot be null");
+                this.access = access;
+        }
+
+        public AccessFlags getAccess() {
+                return access;
+        }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/ClassEntry.java b/src/main/java/cuchaz/enigma/mapping/ClassEntry.java
index 788811f..a49f8dd 100644
--- a/src/main/java/cuchaz/enigma/mapping/ClassEntry.java
+++ b/src/main/java/cuchaz/enigma/mapping/ClassEntry.java
@@ -11,18 +11,18 @@
 
 package cuchaz.enigma.mapping;
 
+import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
 
 import java.util.List;
 
 public class ClassEntry implements Entry {
 
-        private String name;
+        private final String name;
 
         public ClassEntry(String className) {
-                if (className == null) {
-                        throw new IllegalArgumentException("Class name cannot be null!");
-                }
+                Preconditions.checkNotNull(className, "Class name cannot be null");
+
                 if (className.indexOf('.') >= 0) {
                         throw new IllegalArgumentException("Class name must be in JVM format. ie, path/to/package/class$inner : " + className);
                 }
@@ -49,12 +49,12 @@ public class ClassEntry implements Entry {
         }
 
         @Override
-        public ClassEntry getClassEntry() {
+        public ClassEntry getOwnerClassEntry() {
                 return this;
         }
 
         @Override
-        public ClassEntry cloneToNewClass(ClassEntry classEntry) {
+        public ClassEntry updateOwnership(ClassEntry classEntry) {
                 return classEntry;
         }
 
@@ -132,11 +132,7 @@ public class ClassEntry implements Entry {
         }
 
         public String getPackageName() {
-                int pos = this.name.lastIndexOf('/');
-                if (pos > 0) {
-                        return this.name.substring(0, pos);
-                }
-                return null;
+                return getPackageName(this.name);
         }
 
         public String getSimpleName() {
@@ -147,6 +143,14 @@ public class ClassEntry implements Entry {
                 return this.name;
         }
 
+        public static String getPackageName(String name) {
+                int pos = name.lastIndexOf('/');
+                if (pos > 0) {
+                        return name.substring(0, pos);
+                }
+                return null;
+        }
+
         public ClassEntry buildClassEntry(List<ClassEntry> classChain) {
                 assert (classChain.contains(this));
                 StringBuilder buf = new StringBuilder();
diff --git a/src/main/java/cuchaz/enigma/mapping/ClassMapping.java b/src/main/java/cuchaz/enigma/mapping/ClassMapping.java
index 51751ca..c782250 100644
--- a/src/main/java/cuchaz/enigma/mapping/ClassMapping.java
+++ b/src/main/java/cuchaz/enigma/mapping/ClassMapping.java
@@ -34,7 +34,6 @@ public class ClassMapping implements Comparable<ClassMapping> {
         private Map<String, MethodMapping> methodsByDeobf;
         private boolean isDirty;
         private Mappings.EntryModifier modifier;
-        private boolean deobfInner;
 
         public ClassMapping(String obfFullName) {
                 this(obfFullName, null, Mappings.EntryModifier.UNCHANGED);
@@ -81,6 +80,10 @@ public class ClassMapping implements Comparable<ClassMapping> {
                 return deobfName;
         }
 
+        public String getTranslatedName(TranslationDirection direction) {
+                return direction.choose(deobfName, obfFullName);
+        }
+
         //// INNER CLASSES ////////
 
         public void setDeobfName(String val) {
@@ -191,21 +194,21 @@ public class ClassMapping implements Comparable<ClassMapping> {
                 return fieldsByObf.values();
         }
 
-        public boolean containsObfField(String obfName, Type obfType) {
-                return fieldsByObf.containsKey(getFieldKey(obfName, obfType));
+        public boolean containsObfField(String obfName, TypeDescriptor obfDesc) {
+                return fieldsByObf.containsKey(getFieldKey(obfName, obfDesc));
         }
 
-        public boolean containsDeobfField(String deobfName, Type deobfType) {
-                return fieldsByDeobf.containsKey(getFieldKey(deobfName, deobfType));
+        public boolean containsDeobfField(String deobfName, TypeDescriptor deobfDesc) {
+                return fieldsByDeobf.containsKey(getFieldKey(deobfName, deobfDesc));
         }
 
         public void addFieldMapping(FieldMapping fieldMapping) {
-                String obfKey = getFieldKey(fieldMapping.getObfName(), fieldMapping.getObfType());
+                String obfKey = getFieldKey(fieldMapping.getObfName(), fieldMapping.getObfDesc());
                 if (fieldsByObf.containsKey(obfKey)) {
                         throw new Error("Already have mapping for " + obfFullName + "." + obfKey);
                 }
                 if (fieldMapping.getDeobfName() != null) {
-                        String deobfKey = getFieldKey(fieldMapping.getDeobfName(), fieldMapping.getObfType());
+                        String deobfKey = getFieldKey(fieldMapping.getDeobfName(), fieldMapping.getObfDesc());
                         if (fieldsByDeobf.containsKey(deobfKey)) {
                                 throw new Error("Already have mapping for " + deobfName + "." + deobfKey);
                         }
@@ -218,63 +221,67 @@ public class ClassMapping implements Comparable<ClassMapping> {
         }
 
         public void removeFieldMapping(FieldMapping fieldMapping) {
-                boolean obfWasRemoved = fieldsByObf.remove(getFieldKey(fieldMapping.getObfName(), fieldMapping.getObfType())) != null;
+                boolean obfWasRemoved = fieldsByObf.remove(getFieldKey(fieldMapping.getObfName(), fieldMapping.getObfDesc())) != null;
                 assert (obfWasRemoved);
                 if (fieldMapping.getDeobfName() != null) {
-                        boolean deobfWasRemoved = fieldsByDeobf.remove(getFieldKey(fieldMapping.getDeobfName(), fieldMapping.getObfType())) != null;
+                        boolean deobfWasRemoved = fieldsByDeobf.remove(getFieldKey(fieldMapping.getDeobfName(), fieldMapping.getObfDesc())) != null;
                         assert (deobfWasRemoved);
                 }
                 this.isDirty = true;
         }
 
-        public FieldMapping getFieldByObf(String obfName, Type obfType) {
-                return fieldsByObf.get(getFieldKey(obfName, obfType));
+        public FieldMapping getFieldByObf(String obfName, TypeDescriptor obfDesc) {
+                return fieldsByObf.get(getFieldKey(obfName, obfDesc));
+        }
+
+        public FieldMapping getFieldByObf(FieldEntry field) {
+                return getFieldByObf(field.getName(), field.getDesc());
         }
 
-        public FieldMapping getFieldByDeobf(String deobfName, Type obfType) {
-                return fieldsByDeobf.get(getFieldKey(deobfName, obfType));
+        public FieldMapping getFieldByDeobf(String deobfName, TypeDescriptor obfDesc) {
+                return fieldsByDeobf.get(getFieldKey(deobfName, obfDesc));
         }
 
-        public String getObfFieldName(String deobfName, Type obfType) {
-                FieldMapping fieldMapping = fieldsByDeobf.get(getFieldKey(deobfName, obfType));
+        public String getObfFieldName(String deobfName, TypeDescriptor obfDesc) {
+                FieldMapping fieldMapping = fieldsByDeobf.get(getFieldKey(deobfName, obfDesc));
                 if (fieldMapping != null) {
                         return fieldMapping.getObfName();
                 }
                 return null;
         }
 
-        public String getDeobfFieldName(String obfName, Type obfType) {
-                FieldMapping fieldMapping = fieldsByObf.get(getFieldKey(obfName, obfType));
+        public String getDeobfFieldName(String obfName, TypeDescriptor obfDesc) {
+                FieldMapping fieldMapping = fieldsByObf.get(getFieldKey(obfName, obfDesc));
                 if (fieldMapping != null) {
                         return fieldMapping.getDeobfName();
                 }
                 return null;
         }
 
-        private String getFieldKey(String name, Type type) {
+        private String getFieldKey(String name, TypeDescriptor desc) {
                 if (name == null) {
                         throw new IllegalArgumentException("name cannot be null!");
                 }
-                if (type == null) {
-                        throw new IllegalArgumentException("type cannot be null!");
+                if (desc == null) {
+                        throw new IllegalArgumentException("desc cannot be null!");
                 }
-                return name + ":" + type;
+                return name + ":" + desc;
         }
 
-        public void setFieldName(String obfName, Type obfType, String deobfName) {
+        public void setFieldName(String obfName, TypeDescriptor obfDesc, String deobfName) {
                 assert (deobfName != null);
-                FieldMapping fieldMapping = fieldsByObf.get(getFieldKey(obfName, obfType));
+                FieldMapping fieldMapping = fieldsByObf.get(getFieldKey(obfName, obfDesc));
                 if (fieldMapping == null) {
-                        fieldMapping = new FieldMapping(obfName, obfType, deobfName, Mappings.EntryModifier.UNCHANGED);
-                        boolean obfWasAdded = fieldsByObf.put(getFieldKey(obfName, obfType), fieldMapping) == null;
+                        fieldMapping = new FieldMapping(obfName, obfDesc, deobfName, Mappings.EntryModifier.UNCHANGED);
+                        boolean obfWasAdded = fieldsByObf.put(getFieldKey(obfName, obfDesc), fieldMapping) == null;
                         assert (obfWasAdded);
                 } else {
-                        boolean wasRemoved = fieldsByDeobf.remove(getFieldKey(fieldMapping.getDeobfName(), obfType)) != null;
+                        boolean wasRemoved = fieldsByDeobf.remove(getFieldKey(fieldMapping.getDeobfName(), obfDesc)) != null;
                         assert (wasRemoved);
                 }
                 fieldMapping.setDeobfName(deobfName);
                 if (deobfName != null) {
-                        boolean wasAdded = fieldsByDeobf.put(getFieldKey(deobfName, obfType), fieldMapping) == null;
+                        boolean wasAdded = fieldsByDeobf.put(getFieldKey(deobfName, obfDesc), fieldMapping) == null;
                         assert (wasAdded);
                 }
                 this.isDirty = true;
@@ -282,13 +289,13 @@ public class ClassMapping implements Comparable<ClassMapping> {
 
         //// METHODS ////////
 
-        public void setFieldObfNameAndType(String oldObfName, Type obfType, String newObfName, Type newObfType) {
+        public void setFieldObfNameAndType(String oldObfName, TypeDescriptor obfDesc, String newObfName, TypeDescriptor newObfDesc) {
                 assert (newObfName != null);
-                FieldMapping fieldMapping = fieldsByObf.remove(getFieldKey(oldObfName, obfType));
+                FieldMapping fieldMapping = fieldsByObf.remove(getFieldKey(oldObfName, obfDesc));
                 assert (fieldMapping != null);
                 fieldMapping.setObfName(newObfName);
-                fieldMapping.setObfType(newObfType);
-                boolean obfWasAdded = fieldsByObf.put(getFieldKey(newObfName, newObfType), fieldMapping) == null;
+                fieldMapping.setObfDesc(newObfDesc);
+                boolean obfWasAdded = fieldsByObf.put(getFieldKey(newObfName, newObfDesc), fieldMapping) == null;
                 assert (obfWasAdded);
                 this.isDirty = true;
         }
@@ -298,23 +305,23 @@ public class ClassMapping implements Comparable<ClassMapping> {
                 return methodsByObf.values();
         }
 
-        public boolean containsObfMethod(String obfName, Signature obfSignature) {
-                return methodsByObf.containsKey(getMethodKey(obfName, obfSignature));
+        public boolean containsObfMethod(String obfName, MethodDescriptor obfDescriptor) {
+                return methodsByObf.containsKey(getMethodKey(obfName, obfDescriptor));
         }
 
-        public boolean containsDeobfMethod(String deobfName, Signature obfSignature) {
-                return methodsByDeobf.containsKey(getMethodKey(deobfName, obfSignature));
+        public boolean containsDeobfMethod(String deobfName, MethodDescriptor obfDescriptor) {
+                return methodsByDeobf.containsKey(getMethodKey(deobfName, obfDescriptor));
         }
 
         public void addMethodMapping(MethodMapping methodMapping) {
-                String obfKey = getMethodKey(methodMapping.getObfName(), methodMapping.getObfSignature());
+                String obfKey = getMethodKey(methodMapping.getObfName(), methodMapping.getObfDesc());
                 if (methodsByObf.containsKey(obfKey)) {
                         throw new Error("Already have mapping for " + obfFullName + "." + obfKey);
                 }
                 boolean wasAdded = methodsByObf.put(obfKey, methodMapping) == null;
                 assert (wasAdded);
                 if (methodMapping.getDeobfName() != null) {
-                        String deobfKey = getMethodKey(methodMapping.getDeobfName(), methodMapping.getObfSignature());
+                        String deobfKey = getMethodKey(methodMapping.getDeobfName(), methodMapping.getObfDesc());
                         if (methodsByDeobf.containsKey(deobfKey)) {
                                 throw new Error("Already have mapping for " + deobfName + "." + deobfKey);
                         }
@@ -326,44 +333,48 @@ public class ClassMapping implements Comparable<ClassMapping> {
         }
 
         public void removeMethodMapping(MethodMapping methodMapping) {
-                boolean obfWasRemoved = methodsByObf.remove(getMethodKey(methodMapping.getObfName(), methodMapping.getObfSignature())) != null;
+                boolean obfWasRemoved = methodsByObf.remove(getMethodKey(methodMapping.getObfName(), methodMapping.getObfDesc())) != null;
                 assert (obfWasRemoved);
                 if (methodMapping.getDeobfName() != null) {
-                        boolean deobfWasRemoved = methodsByDeobf.remove(getMethodKey(methodMapping.getDeobfName(), methodMapping.getObfSignature())) != null;
+                        boolean deobfWasRemoved = methodsByDeobf.remove(getMethodKey(methodMapping.getDeobfName(), methodMapping.getObfDesc())) != null;
                         assert (deobfWasRemoved);
                 }
                 this.isDirty = true;
         }
 
-        public MethodMapping getMethodByObf(String obfName, Signature obfSignature) {
-                return methodsByObf.get(getMethodKey(obfName, obfSignature));
+        public MethodMapping getMethodByObf(String obfName, MethodDescriptor obfDescriptor) {
+                return methodsByObf.get(getMethodKey(obfName, obfDescriptor));
+        }
+
+        public MethodMapping getMethodByObf(MethodEntry method) {
+                return getMethodByObf(method.getName(), method.getDesc());
         }
 
-        public MethodMapping getMethodByDeobf(String deobfName, Signature obfSignature) {
-                return methodsByDeobf.get(getMethodKey(deobfName, obfSignature));
+        public MethodMapping getMethodByDeobf(String deobfName, MethodDescriptor obfDescriptor) {
+                return methodsByDeobf.get(getMethodKey(deobfName, obfDescriptor));
         }
 
-        private String getMethodKey(String name, Signature signature) {
+        private String getMethodKey(String name, MethodDescriptor descriptor) {
                 if (name == null) {
                         throw new IllegalArgumentException("name cannot be null!");
                 }
-                if (signature == null) {
-                        throw new IllegalArgumentException("signature cannot be null!");
+                if (descriptor == null) {
+                        throw new IllegalArgumentException("descriptor cannot be null!");
                 }
-                return name + signature;
+                return name + descriptor;
         }
 
-        public void setMethodName(String obfName, Signature obfSignature, String deobfName) {
-                MethodMapping methodMapping = methodsByObf.get(getMethodKey(obfName, obfSignature));
+        public void setMethodName(String obfName, MethodDescriptor obfDescriptor, String deobfName) {
+                MethodMapping methodMapping = methodsByObf.get(getMethodKey(obfName, obfDescriptor));
                 if (methodMapping == null) {
-                        methodMapping = createMethodMapping(obfName, obfSignature);
+                        methodMapping = createMethodMapping(obfName, obfDescriptor);
                 } else if (methodMapping.getDeobfName() != null) {
-                        boolean wasRemoved = methodsByDeobf.remove(getMethodKey(methodMapping.getDeobfName(), methodMapping.getObfSignature())) != null;
+                        boolean wasRemoved = methodsByDeobf.remove(getMethodKey(methodMapping.getDeobfName(), methodMapping.getObfDesc())) != null;
                         assert (wasRemoved);
                 }
                 methodMapping.setDeobfName(deobfName);
                 if (deobfName != null) {
-                        boolean wasAdded = methodsByDeobf.put(getMethodKey(deobfName, obfSignature), methodMapping) == null;
+                        boolean wasAdded = methodsByDeobf.put(getMethodKey(deobfName, obfDescriptor), methodMapping) == null;
                         assert (wasAdded);
                 }
                 this.isDirty = true;
@@ -371,35 +382,35 @@ public class ClassMapping implements Comparable<ClassMapping> {
 
         //// ARGUMENTS ////////
 
-        public void setMethodObfNameAndSignature(String oldObfName, Signature obfSignature, String newObfName, Signature newObfSignature) {
+        public void setMethodObfNameAndSignature(String oldObfName, MethodDescriptor obfDescriptor, String newObfName, MethodDescriptor newObfDescriptor) {
                 assert (newObfName != null);
-                MethodMapping methodMapping = methodsByObf.remove(getMethodKey(oldObfName, obfSignature));
+                MethodMapping methodMapping = methodsByObf.remove(getMethodKey(oldObfName, obfDescriptor));
                 assert (methodMapping != null);
                 methodMapping.setObfName(newObfName);
-                methodMapping.setObfSignature(newObfSignature);
-                boolean obfWasAdded = methodsByObf.put(getMethodKey(newObfName, newObfSignature), methodMapping) == null;
+                methodMapping.setObfDescriptor(newObfDescriptor);
+                boolean obfWasAdded = methodsByObf.put(getMethodKey(newObfName, newObfDescriptor), methodMapping) == null;
                 assert (obfWasAdded);
                 this.isDirty = true;
         }
 
-        public void setArgumentName(String obfMethodName, Signature obfMethodSignature, int argumentIndex, String argumentName) {
+        public void setArgumentName(String obfMethodName, MethodDescriptor obfMethodDescriptor, int argumentIndex, String argumentName) {
                 assert (argumentName != null);
-                MethodMapping methodMapping = methodsByObf.get(getMethodKey(obfMethodName, obfMethodSignature));
+                MethodMapping methodMapping = methodsByObf.get(getMethodKey(obfMethodName, obfMethodDescriptor));
                 if (methodMapping == null) {
-                        methodMapping = createMethodMapping(obfMethodName, obfMethodSignature);
+                        methodMapping = createMethodMapping(obfMethodName, obfMethodDescriptor);
                 }
-                methodMapping.setArgumentName(argumentIndex, argumentName);
+                methodMapping.setLocalVariableName(argumentIndex, argumentName);
                 this.isDirty = true;
         }
 
-        public void removeArgumentName(String obfMethodName, Signature obfMethodSignature, int argumentIndex) {
-                methodsByObf.get(getMethodKey(obfMethodName, obfMethodSignature)).removeArgumentName(argumentIndex);
+        public void removeArgumentName(String obfMethodName, MethodDescriptor obfMethodDescriptor, int argumentIndex) {
+                methodsByObf.get(getMethodKey(obfMethodName, obfMethodDescriptor)).removeLocalVariableName(argumentIndex);
                 this.isDirty = true;
         }
 
-        private MethodMapping createMethodMapping(String obfName, Signature obfSignature) {
-                MethodMapping methodMapping = new MethodMapping(obfName, obfSignature);
-                boolean wasAdded = methodsByObf.put(getMethodKey(obfName, obfSignature), methodMapping) == null;
+        private MethodMapping createMethodMapping(String obfName, MethodDescriptor obfDescriptor) {
+                MethodMapping methodMapping = new MethodMapping(obfName, obfDescriptor);
+                boolean wasAdded = methodsByObf.put(getMethodKey(obfName, obfDescriptor), methodMapping) == null;
                 assert (wasAdded);
                 this.isDirty = true;
                 return methodMapping;
@@ -459,24 +470,24 @@ public class ClassMapping implements Comparable<ClassMapping> {
 
                 // rename field types
                 for (FieldMapping fieldMapping : new ArrayList<>(fieldsByObf.values())) {
-                        String oldFieldKey = getFieldKey(fieldMapping.getObfName(), fieldMapping.getObfType());
+                        String oldFieldKey = getFieldKey(fieldMapping.getObfName(), fieldMapping.getObfDesc());
                         if (fieldMapping.renameObfClass(oldObfClassName, newObfClassName)) {
                                 boolean wasRemoved = fieldsByObf.remove(oldFieldKey) != null;
                                 assert (wasRemoved);
                                 boolean wasAdded = fieldsByObf
-                                        .put(getFieldKey(fieldMapping.getObfName(), fieldMapping.getObfType()), fieldMapping) == null;
+                                        .put(getFieldKey(fieldMapping.getObfName(), fieldMapping.getObfDesc()), fieldMapping) == null;
                                 assert (wasAdded);
                         }
                 }
 
                 // rename method signatures
                 for (MethodMapping methodMapping : new ArrayList<>(methodsByObf.values())) {
-                        String oldMethodKey = getMethodKey(methodMapping.getObfName(), methodMapping.getObfSignature());
+                        String oldMethodKey = getMethodKey(methodMapping.getObfName(), methodMapping.getObfDesc());
                         if (methodMapping.renameObfClass(oldObfClassName, newObfClassName)) {
                                 boolean wasRemoved = methodsByObf.remove(oldMethodKey) != null;
                                 assert (wasRemoved);
                                 boolean wasAdded = methodsByObf
-                                        .put(getMethodKey(methodMapping.getObfName(), methodMapping.getObfSignature()), methodMapping) == null;
+                                        .put(getMethodKey(methodMapping.getObfName(), methodMapping.getObfDesc()), methodMapping) == null;
                                 assert (wasAdded);
                         }
                 }
@@ -490,9 +501,9 @@ public class ClassMapping implements Comparable<ClassMapping> {
                 return false;
         }
 
-        public boolean containsArgument(BehaviorEntry obfBehaviorEntry, String name) {
-                MethodMapping methodMapping = methodsByObf.get(getMethodKey(obfBehaviorEntry.getName(), obfBehaviorEntry.getSignature()));
-                return methodMapping != null && methodMapping.containsArgument(name);
+        public boolean containsArgument(MethodEntry obfMethodEntry, String name) {
+                MethodMapping methodMapping = methodsByObf.get(getMethodKey(obfMethodEntry.getName(), obfMethodEntry.getDesc()));
+                return methodMapping != null && methodMapping.containsLocalVariable(name);
         }
 
         public ClassEntry getObfEntry() {
@@ -521,9 +532,9 @@ public class ClassMapping implements Comparable<ClassMapping> {
                 this.modifier = modifier;
         }
 
-        public void setFieldModifier(String obfName, Type obfType, Mappings.EntryModifier modifier) {
-                FieldMapping fieldMapping = fieldsByObf.computeIfAbsent(getFieldKey(obfName, obfType),
-                        k -> new FieldMapping(obfName, obfType, null, Mappings.EntryModifier.UNCHANGED));
+        public void setFieldModifier(String obfName, TypeDescriptor obfDesc, Mappings.EntryModifier modifier) {
+                FieldMapping fieldMapping = fieldsByObf.computeIfAbsent(getFieldKey(obfName, obfDesc),
+                        k -> new FieldMapping(obfName, obfDesc, null, Mappings.EntryModifier.UNCHANGED));
 
                 if (fieldMapping.getModifier() != modifier) {
                         fieldMapping.setModifier(modifier);
@@ -531,7 +542,7 @@ public class ClassMapping implements Comparable<ClassMapping> {
                 }
         }
 
-        public void setMethodModifier(String obfName, Signature sig, Mappings.EntryModifier modifier) {
+        public void setMethodModifier(String obfName, MethodDescriptor sig, Mappings.EntryModifier modifier) {
                 MethodMapping methodMapping = methodsByObf.computeIfAbsent(getMethodKey(obfName, sig),
                         k -> new MethodMapping(obfName, sig, null, Mappings.EntryModifier.UNCHANGED));
 
diff --git a/src/main/java/cuchaz/enigma/mapping/ClassNameReplacer.java b/src/main/java/cuchaz/enigma/mapping/ClassNameReplacer.java
deleted file mode 100644
index 801c410..0000000
--- a/src/main/java/cuchaz/enigma/mapping/ClassNameReplacer.java
+++ /dev/null
@@ -1,16 +0,0 @@
-/*******************************************************************************
- * 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.mapping;
-
-public interface ClassNameReplacer {
-        String replace(String className);
-}
diff --git a/src/main/java/cuchaz/enigma/mapping/ConstructorEntry.java b/src/main/java/cuchaz/enigma/mapping/ConstructorEntry.java
deleted file mode 100644
index 20e5113..0000000
--- a/src/main/java/cuchaz/enigma/mapping/ConstructorEntry.java
+++ /dev/null
@@ -1,105 +0,0 @@
-/*******************************************************************************
- * 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.mapping;
-
-import cuchaz.enigma.utils.Utils;
-
-public class ConstructorEntry implements BehaviorEntry {
-
-        private ClassEntry classEntry;
-        private Signature signature;
-
-        public ConstructorEntry(ClassEntry classEntry) {
-                this(classEntry, null);
-        }
-
-        public ConstructorEntry(ClassEntry classEntry, Signature signature) {
-                if (classEntry == null) {
-                        throw new IllegalArgumentException("Class cannot be null!");
-                }
-
-                this.classEntry = classEntry;
-                this.signature = signature;
-        }
-
-        public ConstructorEntry(ConstructorEntry other, String newClassName) {
-                this.classEntry = new ClassEntry(newClassName);
-                this.signature = other.signature;
-        }
-
-        @Override
-        public ClassEntry getClassEntry() {
-                return this.classEntry;
-        }
-
-        @Override
-        public String getName() {
-                if (isStatic()) {
-                        return "<clinit>";
-                }
-                return "<init>";
-        }
-
-        public boolean isStatic() {
-                return this.signature == null;
-        }
-
-        @Override
-        public Signature getSignature() {
-                return this.signature;
-        }
-
-        @Override
-        public String getClassName() {
-                return this.classEntry.getName();
-        }
-
-        @Override
-        public ConstructorEntry cloneToNewClass(ClassEntry classEntry) {
-                return new ConstructorEntry(this, classEntry.getName());
-        }
-
-        @Override
-        public int hashCode() {
-                if (isStatic()) {
-                        return Utils.combineHashesOrdered(this.classEntry);
-                } else {
-                        return Utils.combineHashesOrdered(this.classEntry, this.signature);
-                }
-        }
-
-        @Override
-        public boolean equals(Object other) {
-                return other instanceof ConstructorEntry && equals((ConstructorEntry) other);
-        }
-
-        public boolean equals(ConstructorEntry other) {
-                if (isStatic() != other.isStatic()) {
-                        return false;
-                }
-
-                if (isStatic()) {
-                        return this.classEntry.equals(other.classEntry);
-                } else {
-                        return this.classEntry.equals(other.classEntry) && this.signature.equals(other.signature);
-                }
-        }
-
-        @Override
-        public String toString() {
-                if (isStatic()) {
-                        return this.classEntry.getName() + "." + getName();
-                } else {
-                        return this.classEntry.getName() + "." + getName() + this.signature;
-                }
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/mapping/DirectionalTranslator.java b/src/main/java/cuchaz/enigma/mapping/DirectionalTranslator.java
new file mode 100644
index 0000000..1283267
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/mapping/DirectionalTranslator.java
@@ -0,0 +1,319 @@
+/*******************************************************************************
+ * 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.mapping;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import cuchaz.enigma.analysis.TranslationIndex;
+import cuchaz.enigma.bytecode.AccessFlags;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class DirectionalTranslator implements Translator {
+
+        private final TranslationDirection direction;
+        private final Map<String, ClassMapping> classes;
+        private final TranslationIndex index;
+
+        public DirectionalTranslator(ReferencedEntryPool entryPool) {
+                this.direction = null;
+                this.classes = Maps.newHashMap();
+                this.index = new TranslationIndex(entryPool);
+        }
+
+        public DirectionalTranslator(TranslationDirection direction, Map<String, ClassMapping> classes, TranslationIndex index) {
+                this.direction = direction;
+                this.classes = classes;
+                this.index = index;
+        }
+
+        public TranslationDirection getDirection() {
+                return direction;
+        }
+
+        public TranslationIndex getTranslationIndex() {
+                return index;
+        }
+
+        @Override
+        public ClassEntry getTranslatedClass(ClassEntry entry) {
+                String className = entry.isInnerClass() ? translateInnerClassName(entry) : translateClassName(entry);
+                return new ClassEntry(className);
+        }
+
+        @Override
+        public ClassDefEntry getTranslatedClassDef(ClassDefEntry entry) {
+                String className = entry.isInnerClass() ? translateInnerClassName(entry) : translateClassName(entry);
+                return new ClassDefEntry(className, getClassModifier(entry).transform(entry.getAccess()));
+        }
+
+        private String translateClassName(ClassEntry entry) {
+                // normal classes are easy
+                ClassMapping classMapping = this.classes.get(entry.getName());
+                if (classMapping == null) {
+                        return entry.getName();
+                }
+                return classMapping.getTranslatedName(direction);
+        }
+
+        private String translateInnerClassName(ClassEntry entry) {
+                // translate as much of the class chain as we can
+                List<ClassMapping> mappingsChain = getClassMappingChain(entry);
+                String[] obfClassNames = entry.getName().split("\\$");
+                StringBuilder buf = new StringBuilder();
+                for (int i = 0; i < obfClassNames.length; i++) {
+                        boolean isFirstClass = buf.length() == 0;
+                        String className = null;
+                        ClassMapping classMapping = mappingsChain.get(i);
+                        if (classMapping != null) {
+                                className = this.direction.choose(
+                                                classMapping.getDeobfName(),
+                                                isFirstClass ? classMapping.getObfFullName() : classMapping.getObfSimpleName()
+                                );
+                        }
+                        if (className == null) {
+                                className = obfClassNames[i];
+                        }
+                        if (!isFirstClass) {
+                                buf.append("$");
+                        }
+                        buf.append(className);
+                }
+                return buf.toString();
+        }
+
+        @Override
+        public FieldDefEntry getTranslatedFieldDef(FieldDefEntry entry) {
+                String translatedName = translateFieldName(entry);
+                if (translatedName == null) {
+                        return entry;
+                }
+                ClassEntry translatedOwner = getTranslatedClass(entry.getOwnerClassEntry());
+                TypeDescriptor translatedDesc = getTranslatedTypeDesc(entry.getDesc());
+                AccessFlags translatedAccess = getFieldModifier(entry).transform(entry.getAccess());
+                return new FieldDefEntry(translatedOwner, translatedName, translatedDesc, translatedAccess);
+        }
+
+        @Override
+        public FieldEntry getTranslatedField(FieldEntry entry) {
+                String translatedName = translateFieldName(entry);
+                if (translatedName == null) {
+                        return null;
+                }
+                ClassEntry translatedOwner = getTranslatedClass(entry.getOwnerClassEntry());
+                TypeDescriptor translatedDesc = getTranslatedTypeDesc(entry.getDesc());
+                return new FieldEntry(translatedOwner, translatedName, translatedDesc);
+        }
+
+        private String translateFieldName(FieldEntry entry) {
+                // resolve the class entry
+                ClassEntry resolvedClassEntry = this.index.resolveEntryOwner(entry);
+                if (resolvedClassEntry != null) {
+                        // look for the class
+                        ClassMapping classMapping = findClassMapping(resolvedClassEntry);
+                        if (classMapping != null) {
+                                // look for the field
+                                FieldMapping mapping = classMapping.getFieldByObf(entry.getName(), entry.getDesc());
+                                if (mapping != null) {
+                                        return this.direction.choose(mapping.getDeobfName(), mapping.getObfName());
+                                }
+                        }
+                }
+                return null;
+        }
+
+        @Override
+        public MethodDefEntry getTranslatedMethodDef(MethodDefEntry entry) {
+                String translatedName = translateMethodName(entry);
+                if (translatedName == null) {
+                        return entry;
+                }
+                ClassEntry translatedOwner = getTranslatedClass(entry.getOwnerClassEntry());
+                MethodDescriptor translatedDesc = getTranslatedMethodDesc(entry.getDesc());
+                AccessFlags access = getMethodModifier(entry).transform(entry.getAccess());
+                return new MethodDefEntry(translatedOwner, translatedName, translatedDesc, access);
+        }
+
+        @Override
+        public MethodEntry getTranslatedMethod(MethodEntry entry) {
+                String translatedName = translateMethodName(entry);
+                if (translatedName == null) {
+                        return null;
+                }
+                ClassEntry translatedOwner = getTranslatedClass(entry.getOwnerClassEntry());
+                MethodDescriptor translatedDesc = getTranslatedMethodDesc(entry.getDesc());
+                return new MethodEntry(translatedOwner, translatedName, translatedDesc);
+        }
+
+        private String translateMethodName(MethodEntry entry) {
+                // resolve the class entry
+                ClassEntry resolvedOwner = this.index.resolveEntryOwner(entry, true);
+                if (resolvedOwner != null) {
+                        // look for class
+                        ClassMapping classMapping = findClassMapping(resolvedOwner);
+                        if (classMapping != null) {
+                                // look for the method
+                                MethodMapping mapping = classMapping.getMethodByObf(entry.getName(), entry.getDesc());
+                                if (mapping != null) {
+                                        return this.direction.choose(mapping.getDeobfName(), mapping.getObfName());
+                                }
+                        }
+                }
+                return null;
+        }
+
+        @Override
+        public LocalVariableEntry getTranslatedVariable(LocalVariableEntry entry) {
+                String translatedArgumentName = translateLocalVariableName(entry);
+                if (translatedArgumentName == null) {
+                        translatedArgumentName = inheritLocalVariableName(entry);
+                }
+                if (translatedArgumentName == null) {
+                        return null;
+                }
+                // TODO: Translating arguments calls method translation.. Can we refactor the code in such a way that we don't need this?
+                MethodEntry translatedOwner = getTranslatedMethod(entry.getOwnerEntry());
+                return new LocalVariableEntry(translatedOwner, entry.getIndex(), translatedArgumentName);
+        }
+
+        @Override
+        public LocalVariableDefEntry getTranslatedVariableDef(LocalVariableDefEntry entry) {
+                String translatedArgumentName = translateLocalVariableName(entry);
+                if (translatedArgumentName == null) {
+                        translatedArgumentName = inheritLocalVariableName(entry);
+                }
+                if (translatedArgumentName == null) {
+                        return entry;
+                }
+                // TODO: Translating arguments calls method translation.. Can we refactor the code in such a way that we don't need this?
+                MethodDefEntry translatedOwner = getTranslatedMethodDef(entry.getOwnerEntry());
+                TypeDescriptor translatedTypeDesc = getTranslatedTypeDesc(entry.getDesc());
+                return new LocalVariableDefEntry(translatedOwner, entry.getIndex(), translatedArgumentName, translatedTypeDesc);
+        }
+
+        // TODO: support not identical behavior (specific to constructor)
+        private String translateLocalVariableName(LocalVariableEntry entry) {
+                // look for identical behavior in superclasses
+                ClassEntry ownerEntry = entry.getOwnerClassEntry();
+                if (ownerEntry != null) {
+                        // look for the class
+                        ClassMapping classMapping = findClassMapping(ownerEntry);
+                        if (classMapping != null) {
+                                // look for the method
+                                MethodMapping methodMapping = classMapping.getMethodByObf(entry.getMethodName(), entry.getMethodDesc());
+                                if (methodMapping != null) {
+                                        int index = entry.getIndex();
+                                        return this.direction.choose(
+                                                        methodMapping.getDeobfLocalVariableName(index),
+                                                        methodMapping.getObfLocalVariableName(index)
+                                        );
+                                }
+                        }
+                }
+                return null;
+        }
+
+        private String inheritLocalVariableName(LocalVariableEntry entry) {
+                List<ClassEntry> ancestry = this.index.getAncestry(entry.getOwnerClassEntry());
+                // Check in mother class for the arg
+                for (ClassEntry ancestorEntry : ancestry) {
+                        LocalVariableEntry motherArg = entry.updateOwnership(ancestorEntry);
+                        if (this.index.entryExists(motherArg)) {
+                                String result = translateLocalVariableName(motherArg);
+                                if (result != null) {
+                                        return result;
+                                }
+                        }
+                }
+                return null;
+        }
+
+        @Override
+        public TypeDescriptor getTranslatedTypeDesc(TypeDescriptor desc) {
+                return desc.remap(name -> getTranslatedClass(new ClassEntry(name)).getName());
+        }
+
+        @Override
+        public MethodDescriptor getTranslatedMethodDesc(MethodDescriptor descriptor) {
+                List<TypeDescriptor> arguments = descriptor.getArgumentDescs();
+                List<TypeDescriptor> translatedArguments = new ArrayList<>(arguments.size());
+                for (TypeDescriptor argument : arguments) {
+                        translatedArguments.add(getTranslatedTypeDesc(argument));
+                }
+                return new MethodDescriptor(translatedArguments, getTranslatedTypeDesc(descriptor.getReturnDesc()));
+        }
+
+        private ClassMapping findClassMapping(ClassEntry entry) {
+                List<ClassMapping> mappingChain = getClassMappingChain(entry);
+                return mappingChain.get(mappingChain.size() - 1);
+        }
+
+        private List<ClassMapping> getClassMappingChain(ClassEntry entry) {
+
+                // get a list of all the classes in the hierarchy
+                String[] parts = entry.getName().split("\\$");
+                List<ClassMapping> mappingsChain = Lists.newArrayList();
+
+                // get mappings for the outer class
+                ClassMapping outerClassMapping = this.classes.get(parts[0]);
+                mappingsChain.add(outerClassMapping);
+
+                for (int i = 1; i < parts.length; i++) {
+
+                        // get mappings for the inner class
+                        ClassMapping innerClassMapping = null;
+                        if (outerClassMapping != null) {
+                                innerClassMapping = this.direction.choose(
+                                                outerClassMapping.getInnerClassByObfSimple(parts[i]),
+                                                outerClassMapping.getInnerClassByDeobfThenObfSimple(parts[i])
+                                );
+                        }
+                        mappingsChain.add(innerClassMapping);
+                        outerClassMapping = innerClassMapping;
+                }
+
+                assert (mappingsChain.size() == parts.length);
+                return mappingsChain;
+        }
+
+        private Mappings.EntryModifier getClassModifier(ClassEntry entry) {
+                ClassMapping classMapping = findClassMapping(entry);
+                if (classMapping != null) {
+                        return classMapping.getModifier();
+                }
+                return Mappings.EntryModifier.UNCHANGED;
+        }
+
+        private Mappings.EntryModifier getFieldModifier(FieldEntry entry) {
+                ClassMapping classMapping = findClassMapping(entry.getOwnerClassEntry());
+                if (classMapping != null) {
+                        FieldMapping fieldMapping = classMapping.getFieldByObf(entry);
+                        if (fieldMapping != null) {
+                                return fieldMapping.getModifier();
+                        }
+                }
+                return Mappings.EntryModifier.UNCHANGED;
+        }
+
+        private Mappings.EntryModifier getMethodModifier(MethodEntry entry) {
+                ClassMapping classMapping = findClassMapping(entry.getOwnerClassEntry());
+                if (classMapping != null) {
+                        MethodMapping methodMapping = classMapping.getMethodByObf(entry);
+                        if (methodMapping != null) {
+                                return methodMapping.getModifier();
+                        }
+                }
+                return Mappings.EntryModifier.UNCHANGED;
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/mapping/Entry.java b/src/main/java/cuchaz/enigma/mapping/Entry.java
index c79510b..eb783e9 100644
--- a/src/main/java/cuchaz/enigma/mapping/Entry.java
+++ b/src/main/java/cuchaz/enigma/mapping/Entry.java
@@ -16,7 +16,7 @@ public interface Entry {
 
         String getClassName();
 
-        ClassEntry getClassEntry();
+        ClassEntry getOwnerClassEntry();
 
-        Entry cloneToNewClass(ClassEntry classEntry);
+        Entry updateOwnership(ClassEntry classEntry);
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/EntryFactory.java b/src/main/java/cuchaz/enigma/mapping/EntryFactory.java
index 993bb64..c20f6f5 100644
--- a/src/main/java/cuchaz/enigma/mapping/EntryFactory.java
+++ b/src/main/java/cuchaz/enigma/mapping/EntryFactory.java
@@ -12,19 +12,8 @@
 package cuchaz.enigma.mapping;
 
 import cuchaz.enigma.analysis.JarIndex;
-import javassist.*;
-import javassist.bytecode.Descriptor;
-import javassist.expr.ConstructorCall;
-import javassist.expr.FieldAccess;
-import javassist.expr.MethodCall;
-import javassist.expr.NewExpr;
 
 public class EntryFactory {
-
-        public static ClassEntry getClassEntry(CtClass c) {
-                return new ClassEntry(Descriptor.toJvmName(c.getName()));
-        }
-
         public static ClassEntry getObfClassEntry(JarIndex jarIndex, ClassMapping classMapping) {
                 ClassEntry obfClassEntry = new ClassEntry(classMapping.getObfFullName());
                 return obfClassEntry.buildClassEntry(jarIndex.getObfClassChain(obfClassEntry));
@@ -38,95 +27,19 @@ public class EntryFactory {
                 return new ClassEntry(classMapping.getDeobfName());
         }
 
-        public static ClassEntry getSuperclassEntry(CtClass c) {
-                return new ClassEntry(Descriptor.toJvmName(c.getClassFile().getSuperclass()));
-        }
-
-        public static FieldEntry getFieldEntry(CtField field) {
-                return new FieldEntry(getClassEntry(field.getDeclaringClass()), field.getName(), new Type(field.getFieldInfo().getDescriptor()));
-        }
-
-        public static FieldEntry getFieldEntry(FieldAccess call) {
-                return new FieldEntry(new ClassEntry(Descriptor.toJvmName(call.getClassName())), call.getFieldName(), new Type(call.getSignature()));
-        }
-
-        public static FieldEntry getFieldEntry(String className, String name, String type) {
-                return new FieldEntry(new ClassEntry(className), name, new Type(type));
-        }
-
         public static FieldEntry getObfFieldEntry(ClassMapping classMapping, FieldMapping fieldMapping) {
-                return new FieldEntry(getObfClassEntry(classMapping), fieldMapping.getObfName(), fieldMapping.getObfType());
-        }
-
-        public static MethodEntry getMethodEntry(CtMethod method) {
-                return new MethodEntry(getClassEntry(method.getDeclaringClass()), method.getName(), new Signature(method.getMethodInfo().getDescriptor()));
-        }
-
-        public static MethodEntry getMethodEntry(MethodCall call) {
-                return new MethodEntry(new ClassEntry(Descriptor.toJvmName(call.getClassName())), call.getMethodName(), new Signature(call.getSignature()));
-        }
-
-        public static ConstructorEntry getConstructorEntry(CtConstructor constructor) {
-                if (constructor.isClassInitializer()) {
-                        return new ConstructorEntry(getClassEntry(constructor.getDeclaringClass()));
-                } else {
-                        return new ConstructorEntry(getClassEntry(constructor.getDeclaringClass()), new Signature(constructor.getMethodInfo().getDescriptor()));
-                }
-        }
-
-        public static ConstructorEntry getConstructorEntry(ConstructorCall call) {
-                return new ConstructorEntry(new ClassEntry(Descriptor.toJvmName(call.getClassName())), new Signature(call.getSignature()));
-        }
-
-        public static ConstructorEntry getConstructorEntry(NewExpr call) {
-                return new ConstructorEntry(new ClassEntry(Descriptor.toJvmName(call.getClassName())), new Signature(call.getSignature()));
-        }
-
-        public static BehaviorEntry getBehaviorEntry(CtBehavior behavior) {
-                if (behavior instanceof CtMethod) {
-                        return getMethodEntry((CtMethod) behavior);
-                } else if (behavior instanceof CtConstructor) {
-                        return getConstructorEntry((CtConstructor) behavior);
-                }
-                throw new Error("behavior is neither Method nor Constructor!");
-        }
-
-        public static BehaviorEntry getBehaviorEntry(String className, String behaviorName, String behaviorSignature) {
-                return getBehaviorEntry(new ClassEntry(className), behaviorName, new Signature(behaviorSignature));
-        }
-
-        public static BehaviorEntry getBehaviorEntry(String className, String behaviorName) {
-                return getBehaviorEntry(new ClassEntry(className), behaviorName);
-        }
-
-        public static BehaviorEntry getBehaviorEntry(String className) {
-                return new ConstructorEntry(new ClassEntry(className));
-        }
-
-        public static BehaviorEntry getBehaviorEntry(ClassEntry classEntry, String behaviorName, Signature behaviorSignature) {
-                switch (behaviorName) {
-                        case "<init>":
-                                return new ConstructorEntry(classEntry, behaviorSignature);
-                        case "<clinit>":
-                                return new ConstructorEntry(classEntry);
-                        default:
-                                return new MethodEntry(classEntry, behaviorName, behaviorSignature);
-                }
+                return new FieldEntry(getObfClassEntry(classMapping), fieldMapping.getObfName(), fieldMapping.getObfDesc());
         }
 
-        public static BehaviorEntry getBehaviorEntry(ClassEntry classEntry, String behaviorName) {
-                if (behaviorName.equals("<clinit>")) {
-                        return new ConstructorEntry(classEntry);
-                } else {
-                        throw new IllegalArgumentException("Only class initializers don't have signatures");
-                }
+        public static MethodEntry getMethodEntry(ClassEntry classEntry, String name, MethodDescriptor desc) {
+                return new MethodEntry(classEntry, name, desc);
         }
 
-        public static BehaviorEntry getObfBehaviorEntry(ClassEntry classEntry, MethodMapping methodMapping) {
-                return getBehaviorEntry(classEntry, methodMapping.getObfName(), methodMapping.getObfSignature());
+        public static MethodEntry getObfMethodEntry(ClassEntry classEntry, MethodMapping methodMapping) {
+                return getMethodEntry(classEntry, methodMapping.getObfName(), methodMapping.getObfDesc());
         }
 
-        public static BehaviorEntry getObfBehaviorEntry(ClassMapping classMapping, MethodMapping methodMapping) {
-                return getObfBehaviorEntry(getObfClassEntry(classMapping), methodMapping);
+        public static MethodEntry getObfMethodEntry(ClassMapping classMapping, MethodMapping methodMapping) {
+                return getObfMethodEntry(getObfClassEntry(classMapping), methodMapping);
         }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/FieldDefEntry.java b/src/main/java/cuchaz/enigma/mapping/FieldDefEntry.java
new file mode 100644
index 0000000..262c16c
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/mapping/FieldDefEntry.java
@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * 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.mapping;
+
+import com.google.common.base.Preconditions;
+import cuchaz.enigma.bytecode.AccessFlags;
+
+public class FieldDefEntry extends FieldEntry {
+        private final AccessFlags access;
+
+        public FieldDefEntry(ClassEntry ownerEntry, String name, TypeDescriptor desc, AccessFlags access) {
+                super(ownerEntry, name, desc);
+                Preconditions.checkNotNull(access, "Field access cannot be null");
+                this.access = access;
+        }
+
+        public AccessFlags getAccess() {
+                return access;
+        }
+
+        @Override
+        public FieldDefEntry updateOwnership(ClassEntry owner) {
+                return new FieldDefEntry(owner, this.name, this.desc, access);
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/mapping/FieldEntry.java b/src/main/java/cuchaz/enigma/mapping/FieldEntry.java
index 0f1f506..c118ac0 100644
--- a/src/main/java/cuchaz/enigma/mapping/FieldEntry.java
+++ b/src/main/java/cuchaz/enigma/mapping/FieldEntry.java
@@ -11,40 +11,29 @@
 
 package cuchaz.enigma.mapping;
 
+import com.google.common.base.Preconditions;
 import cuchaz.enigma.utils.Utils;
 
 public class FieldEntry implements Entry {
 
-        private ClassEntry classEntry;
-        private String name;
-        private Type type;
+        protected final ClassEntry ownerEntry;
+        protected final String name;
+        protected final TypeDescriptor desc;
 
         // NOTE: this argument order is important for the MethodReader/MethodWriter
-        public FieldEntry(ClassEntry classEntry, String name, Type type) {
-                if (classEntry == null) {
-                        throw new IllegalArgumentException("Class cannot be null!");
-                }
-                if (name == null) {
-                        throw new IllegalArgumentException("Field name cannot be null!");
-                }
-                if (type == null) {
-                        throw new IllegalArgumentException("Field type cannot be null!");
-                }
+        public FieldEntry(ClassEntry ownerEntry, String name, TypeDescriptor desc) {
+                Preconditions.checkNotNull(ownerEntry, "Owner cannot be null");
+                Preconditions.checkNotNull(name, "Field name cannot be null");
+                Preconditions.checkNotNull(desc, "Field descriptor cannot be null");
 
-                this.classEntry = classEntry;
+                this.ownerEntry = ownerEntry;
                 this.name = name;
-                this.type = type;
-        }
-
-        public FieldEntry(FieldEntry other, ClassEntry newClassEntry) {
-                this.classEntry = newClassEntry;
-                this.name = other.name;
-                this.type = other.type;
+                this.desc = desc;
         }
 
         @Override
-        public ClassEntry getClassEntry() {
-                return this.classEntry;
+        public ClassEntry getOwnerClassEntry() {
+                return this.ownerEntry;
         }
 
         @Override
@@ -54,21 +43,21 @@ public class FieldEntry implements Entry {
 
         @Override
         public String getClassName() {
-                return this.classEntry.getName();
+                return this.ownerEntry.getName();
         }
 
-        public Type getType() {
-                return this.type;
+        public TypeDescriptor getDesc() {
+                return this.desc;
         }
 
         @Override
-        public FieldEntry cloneToNewClass(ClassEntry classEntry) {
-                return new FieldEntry(this, classEntry);
+        public FieldEntry updateOwnership(ClassEntry owner) {
+                return new FieldEntry(owner, this.name, this.desc);
         }
 
         @Override
         public int hashCode() {
-                return Utils.combineHashesOrdered(this.classEntry, this.name, this.type);
+                return Utils.combineHashesOrdered(this.ownerEntry, this.name, this.desc);
         }
 
         @Override
@@ -77,11 +66,11 @@ public class FieldEntry implements Entry {
         }
 
         public boolean equals(FieldEntry other) {
-                return this.classEntry.equals(other.classEntry) && this.name.equals(other.name) && this.type.equals(other.type);
+                return this.ownerEntry.equals(other.ownerEntry) && this.name.equals(other.name) && this.desc.equals(other.desc);
         }
 
         @Override
         public String toString() {
-                return this.classEntry.getName() + "." + this.name + ":" + this.type;
+                return this.ownerEntry.getName() + "." + this.name + ":" + this.desc;
         }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/FieldMapping.java b/src/main/java/cuchaz/enigma/mapping/FieldMapping.java
index cd761b4..3c46a37 100644
--- a/src/main/java/cuchaz/enigma/mapping/FieldMapping.java
+++ b/src/main/java/cuchaz/enigma/mapping/FieldMapping.java
@@ -17,26 +17,19 @@ public class FieldMapping implements Comparable<FieldMapping>, MemberMapping<Fie
 
         private String obfName;
         private String deobfName;
-        private Type obfType;
+        private TypeDescriptor obfDesc;
         private Mappings.EntryModifier modifier;
 
-        public FieldMapping(String obfName, Type obfType, String deobfName, Mappings.EntryModifier modifier) {
+        public FieldMapping(String obfName, TypeDescriptor obfDesc, String deobfName, Mappings.EntryModifier modifier) {
                 this.obfName = obfName;
                 this.deobfName = NameValidator.validateFieldName(deobfName);
-                this.obfType = obfType;
+                this.obfDesc = obfDesc;
                 this.modifier = modifier;
         }
 
-        public FieldMapping(FieldMapping other, ClassNameReplacer obfClassNameReplacer) {
-                this.obfName = other.obfName;
-                this.deobfName = other.deobfName;
-                this.modifier = other.modifier;
-                this.obfType = new Type(other.obfType, obfClassNameReplacer);
-        }
-
         @Override
         public FieldEntry getObfEntry(ClassEntry classEntry) {
-                return new FieldEntry(classEntry, this.obfName, this.obfType);
+                return new FieldEntry(classEntry, this.obfName, this.obfDesc);
         }
 
         @Override
@@ -65,12 +58,12 @@ public class FieldMapping implements Comparable<FieldMapping>, MemberMapping<Fie
                 this.deobfName = NameValidator.validateFieldName(val);
         }
 
-        public Type getObfType() {
-                return this.obfType;
+        public TypeDescriptor getObfDesc() {
+                return this.obfDesc;
         }
 
-        public void setObfType(Type val) {
-                this.obfType = val;
+        public void setObfDesc(TypeDescriptor val) {
+                this.obfDesc = val;
         }
 
         public Mappings.EntryModifier getModifier() {
@@ -83,21 +76,20 @@ public class FieldMapping implements Comparable<FieldMapping>, MemberMapping<Fie
 
         @Override
         public int compareTo(FieldMapping other) {
-                return (this.obfName + this.obfType).compareTo(other.obfName + other.obfType);
+                return (this.obfName + this.obfDesc).compareTo(other.obfName + other.obfDesc);
         }
 
         public boolean renameObfClass(final String oldObfClassName, final String newObfClassName) {
-                // rename obf classes in the type
-                Type newType = new Type(this.obfType, className ->
-                {
+                // rename obf classes in the desc
+                TypeDescriptor newDesc = this.obfDesc.remap(className -> {
                         if (className.equals(oldObfClassName)) {
                                 return newObfClassName;
                         }
-                        return null;
+                        return className;
                 });
 
-                if (!newType.equals(this.obfType)) {
-                        this.obfType = newType;
+                if (!newDesc.equals(this.obfDesc)) {
+                        this.obfDesc = newDesc;
                         return true;
                 }
                 return false;
diff --git a/src/main/java/cuchaz/enigma/mapping/LocalVariableDefEntry.java b/src/main/java/cuchaz/enigma/mapping/LocalVariableDefEntry.java
new file mode 100644
index 0000000..cc677c5
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/mapping/LocalVariableDefEntry.java
@@ -0,0 +1,75 @@
+package cuchaz.enigma.mapping;
+
+import com.google.common.base.Preconditions;
+import cuchaz.enigma.utils.Utils;
+
+/**
+ * TypeDescriptor...
+ * Created by Thog
+ * 19/10/2016
+ */
+public class LocalVariableDefEntry extends LocalVariableEntry {
+
+        protected final MethodDefEntry ownerEntry;
+        protected final TypeDescriptor desc;
+
+        public LocalVariableDefEntry(MethodDefEntry ownerEntry, int index, String name, TypeDescriptor desc) {
+                super(ownerEntry, index, name);
+                Preconditions.checkNotNull(desc, "Variable desc cannot be null");
+
+                this.ownerEntry = ownerEntry;
+                this.desc = desc;
+        }
+
+        public LocalVariableDefEntry(MethodDefEntry ownerEntry, int index, String name) {
+                super(ownerEntry, index, name);
+
+                this.ownerEntry = ownerEntry;
+
+                int namedIndex = getNamedIndex();
+                if (namedIndex < 0) {
+                        this.desc = TypeDescriptor.of(ownerEntry.getOwnerClassEntry().getName());
+                } else {
+                        this.desc = ownerEntry.getDesc().getArgumentDescs().get(namedIndex);
+                }
+        }
+
+        @Override
+        public MethodDefEntry getOwnerEntry() {
+                return this.ownerEntry;
+        }
+
+        public TypeDescriptor getDesc() {
+                return desc;
+        }
+
+        public int getNamedIndex() {
+                // If we're not static, "this" is bound to index 0
+                int indexOffset = ownerEntry.getAccess().isStatic() ? 0 : 1;
+                return index - indexOffset;
+        }
+
+        @Override
+        public LocalVariableDefEntry updateOwnership(ClassEntry classEntry) {
+                return new LocalVariableDefEntry(ownerEntry.updateOwnership(classEntry), index, name, desc);
+        }
+
+        @Override
+        public int hashCode() {
+                return Utils.combineHashesOrdered(this.ownerEntry, this.desc.hashCode(), this.name.hashCode(), Integer.hashCode(this.index));
+        }
+
+        @Override
+        public boolean equals(Object other) {
+                return other instanceof LocalVariableDefEntry && equals((LocalVariableDefEntry) other);
+        }
+
+        public boolean equals(LocalVariableDefEntry other) {
+                return this.ownerEntry.equals(other.ownerEntry) && this.desc.equals(other.desc) && this.name.equals(other.name) && this.index == other.index;
+        }
+
+        @Override
+        public String toString() {
+                return this.ownerEntry + "(" + this.index + ":" + this.name + ":" + this.desc + ")";
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/mapping/LocalVariableEntry.java b/src/main/java/cuchaz/enigma/mapping/LocalVariableEntry.java
index 2bb5e3f..dcfd0ff 100644
--- a/src/main/java/cuchaz/enigma/mapping/LocalVariableEntry.java
+++ b/src/main/java/cuchaz/enigma/mapping/LocalVariableEntry.java
@@ -1,52 +1,31 @@
 package cuchaz.enigma.mapping;
 
+import com.google.common.base.Preconditions;
 import cuchaz.enigma.utils.Utils;
 
 /**
- * Desc...
+ * TypeDescriptor...
  * Created by Thog
  * 19/10/2016
  */
 public class LocalVariableEntry implements Entry {
 
-        protected final BehaviorEntry behaviorEntry;
+        protected final MethodEntry ownerEntry;
         protected final String name;
-        protected final Type type;
         protected final int index;
 
-        public LocalVariableEntry(BehaviorEntry behaviorEntry, int index, String name, Type type) {
-                if (behaviorEntry == null) {
-                        throw new IllegalArgumentException("Behavior cannot be null!");
-                }
-                if (index < 0) {
-                        throw new IllegalArgumentException("Index must be non-negative!");
-                }
-                if (name == null) {
-                        throw new IllegalArgumentException("Variable name cannot be null!");
-                }
-                if (type == null) {
-                        throw new IllegalArgumentException("Variable type cannot be null!");
-                }
-
-                this.behaviorEntry = behaviorEntry;
+        public LocalVariableEntry(MethodEntry ownerEntry, int index, String name) {
+                Preconditions.checkNotNull(ownerEntry, "Variable owner cannot be null");
+                Preconditions.checkNotNull(name, "Variable name cannot be null");
+                Preconditions.checkArgument(index >= 0, "Index must be positive");
+
+                this.ownerEntry = ownerEntry;
                 this.name = name;
-                this.type = type;
                 this.index = index;
         }
 
-        public LocalVariableEntry(LocalVariableEntry other, ClassEntry newClassEntry) {
-                this.behaviorEntry = (BehaviorEntry) other.behaviorEntry.cloneToNewClass(newClassEntry);
-                this.name = other.name;
-                this.type = other.type;
-                this.index = other.index;
-        }
-
-        public BehaviorEntry getBehaviorEntry() {
-                return this.behaviorEntry;
-        }
-
-        public Type getType() {
-                return type;
+        public MethodEntry getOwnerEntry() {
+                return this.ownerEntry;
         }
 
         public int getIndex() {
@@ -59,31 +38,31 @@ public class LocalVariableEntry implements Entry {
         }
 
         @Override
-        public ClassEntry getClassEntry() {
-                return this.behaviorEntry.getClassEntry();
+        public ClassEntry getOwnerClassEntry() {
+                return this.ownerEntry.getOwnerClassEntry();
         }
 
         @Override
         public String getClassName() {
-                return this.behaviorEntry.getClassName();
+                return this.ownerEntry.getClassName();
         }
 
         @Override
-        public LocalVariableEntry cloneToNewClass(ClassEntry classEntry) {
-                return new LocalVariableEntry(this, classEntry);
+        public LocalVariableEntry updateOwnership(ClassEntry classEntry) {
+                return new LocalVariableEntry(ownerEntry.updateOwnership(classEntry), index, name);
         }
 
         public String getMethodName() {
-                return this.behaviorEntry.getName();
+                return this.ownerEntry.getName();
         }
 
-        public Signature getMethodSignature() {
-                return this.behaviorEntry.getSignature();
+        public MethodDescriptor getMethodDesc() {
+                return this.ownerEntry.getDesc();
         }
 
         @Override
         public int hashCode() {
-                return Utils.combineHashesOrdered(this.behaviorEntry, this.type.hashCode(), this.name.hashCode(), Integer.hashCode(this.index));
+                return Utils.combineHashesOrdered(this.ownerEntry, this.name.hashCode(), Integer.hashCode(this.index));
         }
 
         @Override
@@ -92,11 +71,11 @@ public class LocalVariableEntry implements Entry {
         }
 
         public boolean equals(LocalVariableEntry other) {
-                return this.behaviorEntry.equals(other.behaviorEntry) && this.type.equals(other.type) && this.name.equals(other.name) && this.index == other.index;
+                return this.ownerEntry.equals(other.ownerEntry) && this.name.equals(other.name) && this.index == other.index;
         }
 
         @Override
         public String toString() {
-                return this.behaviorEntry + "(" + this.index + ":" + this.name + ":" + this.type + ")";
+                return this.ownerEntry + "(" + this.index + ":" + this.name + ")";
         }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/ArgumentMapping.java b/src/main/java/cuchaz/enigma/mapping/LocalVariableMapping.java
index 91ecd10..193c566 100644
--- a/src/main/java/cuchaz/enigma/mapping/ArgumentMapping.java
+++ b/src/main/java/cuchaz/enigma/mapping/LocalVariableMapping.java
@@ -11,18 +11,18 @@
 
 package cuchaz.enigma.mapping;
 
-public class ArgumentMapping implements Comparable<ArgumentMapping> {
+public class LocalVariableMapping implements Comparable<LocalVariableMapping> {
 
         private int index;
         private String name;
 
         // NOTE: this argument order is important for the MethodReader/MethodWriter
-        public ArgumentMapping(int index, String name) {
+        public LocalVariableMapping(int index, String name) {
                 this.index = index;
                 this.name = NameValidator.validateArgumentName(name);
         }
 
-        public ArgumentMapping(ArgumentMapping other) {
+        public LocalVariableMapping(LocalVariableMapping other) {
                 this.index = other.index;
                 this.name = other.name;
         }
@@ -39,12 +39,12 @@ public class ArgumentMapping implements Comparable<ArgumentMapping> {
                 this.name = NameValidator.validateArgumentName(val);
         }
 
-        public ArgumentEntry getObfEntry(BehaviorEntry behaviorEntry) {
-                return new ArgumentEntry(behaviorEntry, index, name);
+        public LocalVariableEntry getObfEntry(MethodEntry methodEntry) {
+                return new LocalVariableEntry(methodEntry, index, name);
         }
 
         @Override
-        public int compareTo(ArgumentMapping other) {
+        public int compareTo(LocalVariableMapping other) {
                 return Integer.compare(this.index, other.index);
         }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/Mappings.java b/src/main/java/cuchaz/enigma/mapping/Mappings.java
index cf78ca3..cc1ec9c 100644
--- a/src/main/java/cuchaz/enigma/mapping/Mappings.java
+++ b/src/main/java/cuchaz/enigma/mapping/Mappings.java
@@ -15,6 +15,7 @@ import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import cuchaz.enigma.analysis.TranslationIndex;
+import cuchaz.enigma.bytecode.AccessFlags;
 import cuchaz.enigma.throwables.MappingConflict;
 
 import java.io.File;
@@ -96,11 +97,11 @@ public class Mappings {
 
         public Translator getTranslator(TranslationDirection direction, TranslationIndex index) {
                 switch (direction) {
-                        case Deobfuscating:
+                        case DEOBFUSCATING:
 
-                                return new Translator(direction, this.classesByObf, index);
+                                return new DirectionalTranslator(direction, this.classesByObf, index);
 
-                        case Obfuscating:
+                        case OBFUSCATING:
 
                                 // fill in the missing deobf class entries with obf entries
                                 Map<String, ClassMapping> classes = Maps.newHashMap();
@@ -114,9 +115,9 @@ public class Mappings {
 
                                 // translate the translation index
                                 // NOTE: this isn't actually recursive
-                                TranslationIndex deobfIndex = new TranslationIndex(index, getTranslator(TranslationDirection.Deobfuscating, index));
+                                TranslationIndex deobfIndex = new TranslationIndex(index, getTranslator(TranslationDirection.DEOBFUSCATING, index));
 
-                                return new Translator(direction, classes, deobfIndex);
+                                return new DirectionalTranslator(direction, classes, deobfIndex);
 
                         default:
                                 throw new Error("Invalid translation direction!");
@@ -151,9 +152,9 @@ public class Mappings {
 
                         // add classes from method signatures
                         for (MethodMapping methodMapping : classMapping.methods()) {
-                                for (Type type : methodMapping.getObfSignature().types()) {
-                                        if (type.hasClass()) {
-                                                classNames.add(type.getClassEntry().getClassName());
+                                for (TypeDescriptor desc : methodMapping.getObfDesc().types()) {
+                                        if (desc.containsType()) {
+                                                classNames.add(desc.getOwnerEntry().getClassName());
                                         }
                                 }
                         }
@@ -165,9 +166,9 @@ public class Mappings {
                 return this.classesByDeobf.containsKey(deobfName);
         }
 
-        public boolean containsDeobfField(ClassEntry obfClassEntry, String deobfName, Type obfType) {
+        public boolean containsDeobfField(ClassEntry obfClassEntry, String deobfName, TypeDescriptor obfDesc) {
                 ClassMapping classMapping = this.classesByObf.get(obfClassEntry.getName());
-                return classMapping != null && classMapping.containsDeobfField(deobfName, obfType);
+                return classMapping != null && classMapping.containsDeobfField(deobfName, obfDesc);
         }
 
         public boolean containsDeobfField(ClassEntry obfClassEntry, String deobfName) {
@@ -180,14 +181,14 @@ public class Mappings {
                 return false;
         }
 
-        public boolean containsDeobfMethod(ClassEntry obfClassEntry, String deobfName, Signature obfSignature) {
+        public boolean containsDeobfMethod(ClassEntry obfClassEntry, String deobfName, MethodDescriptor obfDescriptor) {
                 ClassMapping classMapping = this.classesByObf.get(obfClassEntry.getName());
-                return classMapping != null && classMapping.containsDeobfMethod(deobfName, obfSignature);
+                return classMapping != null && classMapping.containsDeobfMethod(deobfName, obfDescriptor);
         }
 
-        public boolean containsArgument(BehaviorEntry obfBehaviorEntry, String name) {
-                ClassMapping classMapping = this.classesByObf.get(obfBehaviorEntry.getClassName());
-                return classMapping != null && classMapping.containsArgument(obfBehaviorEntry, name);
+        public boolean containsArgument(MethodEntry obfMethodEntry, String name) {
+                ClassMapping classMapping = this.classesByObf.get(obfMethodEntry.getClassName());
+                return classMapping != null && classMapping.containsArgument(obfMethodEntry, name);
         }
 
         public List<ClassMapping> getClassMappingChain(ClassEntry obfClass) {
@@ -239,5 +240,19 @@ public class Mappings {
                 public String getFormattedName() {
                         return " ACC:" + super.toString();
                 }
+
+                public AccessFlags transform(AccessFlags access) {
+                        switch (this) {
+                                case PUBLIC:
+                                        return access.setPublic();
+                                case PROTECTED:
+                                        return access.setProtected();
+                                case PRIVATE:
+                                        return access.setPrivate();
+                                case UNCHANGED:
+                                default:
+                                        return access;
+                        }
+                }
         }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/MappingsChecker.java b/src/main/java/cuchaz/enigma/mapping/MappingsChecker.java
index 172641b..4d5be2f 100644
--- a/src/main/java/cuchaz/enigma/mapping/MappingsChecker.java
+++ b/src/main/java/cuchaz/enigma/mapping/MappingsChecker.java
@@ -23,7 +23,7 @@ public class MappingsChecker {
         private Map<ClassEntry, ClassMapping> droppedClassMappings;
         private Map<ClassEntry, ClassMapping> droppedInnerClassMappings;
         private Map<FieldEntry, FieldMapping> droppedFieldMappings;
-        private Map<BehaviorEntry, MethodMapping> droppedMethodMappings;
+        private Map<MethodEntry, MethodMapping> droppedMethodMappings;
 
         public MappingsChecker(JarIndex index) {
                 this.index = index;
@@ -45,7 +45,7 @@ public class MappingsChecker {
                 return this.droppedFieldMappings;
         }
 
-        public Map<BehaviorEntry, MethodMapping> getDroppedMethodMappings() {
+        public Map<MethodEntry, MethodMapping> getDroppedMethodMappings() {
                 return this.droppedMethodMappings;
         }
 
@@ -77,10 +77,10 @@ public class MappingsChecker {
 
                 // check methods
                 for (MethodMapping methodMapping : Lists.newArrayList(classMapping.methods())) {
-                        BehaviorEntry obfBehaviorEntry = EntryFactory.getObfBehaviorEntry(classEntry, methodMapping);
-                        if (!this.index.containsObfBehavior(obfBehaviorEntry)) {
+                        MethodEntry obfMethodEntry = EntryFactory.getObfMethodEntry(classEntry, methodMapping);
+                        if (!this.index.containsObfMethod(obfMethodEntry)) {
                                 classMapping.removeMethodMapping(methodMapping);
-                                this.droppedMethodMappings.put(obfBehaviorEntry, methodMapping);
+                                this.droppedMethodMappings.put(obfMethodEntry, methodMapping);
                         }
                 }
 
diff --git a/src/main/java/cuchaz/enigma/mapping/MappingsEnigmaReader.java b/src/main/java/cuchaz/enigma/mapping/MappingsEnigmaReader.java
index a0d4313..d1d5634 100644
--- a/src/main/java/cuchaz/enigma/mapping/MappingsEnigmaReader.java
+++ b/src/main/java/cuchaz/enigma/mapping/MappingsEnigmaReader.java
@@ -123,8 +123,8 @@ public class MappingsEnigmaReader {
                 return mappings;
         }
 
-        private ArgumentMapping readArgument(String[] parts) {
-                return new ArgumentMapping(Integer.parseInt(parts[1]), parts[2]);
+        private LocalVariableMapping readArgument(String[] parts) {
+                return new LocalVariableMapping(Integer.parseInt(parts[1]), parts[2]);
         }
 
         private ClassMapping readClass(String[] parts, boolean makeSimple) {
@@ -150,27 +150,27 @@ public class MappingsEnigmaReader {
                 if (parts.length == 4) {
                         boolean access = parts[3].startsWith("ACC:");
                         if (access)
-                                mapping = new FieldMapping(parts[1], new Type(parts[2]), null,
+                                mapping = new FieldMapping(parts[1], new TypeDescriptor(parts[2]), null,
                                         Mappings.EntryModifier.valueOf(parts[3].substring(4)));
                         else
-                                mapping = new FieldMapping(parts[1], new Type(parts[3]), parts[2], Mappings.EntryModifier.UNCHANGED);
+                                mapping = new FieldMapping(parts[1], new TypeDescriptor(parts[3]), parts[2], Mappings.EntryModifier.UNCHANGED);
                 } else if (parts.length == 5)
-                        mapping = new FieldMapping(parts[1], new Type(parts[3]), parts[2], Mappings.EntryModifier.valueOf(parts[4].substring(4)));
+                        mapping = new FieldMapping(parts[1], new TypeDescriptor(parts[3]), parts[2], Mappings.EntryModifier.valueOf(parts[4].substring(4)));
                 return mapping;
         }
 
         private MethodMapping readMethod(String[] parts) {
                 MethodMapping mapping = null;
                 if (parts.length == 3)
-                        mapping = new MethodMapping(parts[1], new Signature(parts[2]));
+                        mapping = new MethodMapping(parts[1], new MethodDescriptor(parts[2]));
                 else if (parts.length == 4) {
                         boolean access = parts[3].startsWith("ACC:");
                         if (access)
-                                mapping = new MethodMapping(parts[1], new Signature(parts[2]), null, Mappings.EntryModifier.valueOf(parts[3].substring(4)));
+                                mapping = new MethodMapping(parts[1], new MethodDescriptor(parts[2]), null, Mappings.EntryModifier.valueOf(parts[3].substring(4)));
                         else
-                                mapping = new MethodMapping(parts[1], new Signature(parts[3]), parts[2]);
+                                mapping = new MethodMapping(parts[1], new MethodDescriptor(parts[3]), parts[2]);
                 } else if (parts.length == 5)
-                        mapping = new MethodMapping(parts[1], new Signature(parts[3]), parts[2],
+                        mapping = new MethodMapping(parts[1], new MethodDescriptor(parts[3]), parts[2],
                                 Mappings.EntryModifier.valueOf(parts[4].substring(4)));
                 return mapping;
         }
diff --git a/src/main/java/cuchaz/enigma/mapping/MappingsEnigmaWriter.java b/src/main/java/cuchaz/enigma/mapping/MappingsEnigmaWriter.java
index ba1b258..1929977 100644
--- a/src/main/java/cuchaz/enigma/mapping/MappingsEnigmaWriter.java
+++ b/src/main/java/cuchaz/enigma/mapping/MappingsEnigmaWriter.java
@@ -127,29 +127,29 @@ public class MappingsEnigmaWriter {
 
         private void write(PrintWriter out, FieldMapping fieldMapping, int depth) {
                 if (fieldMapping.getDeobfName() == null)
-                        out.format("%sFIELD %s %s%s\n", getIndent(depth), fieldMapping.getObfName(), fieldMapping.getObfType().toString(),
+                        out.format("%sFIELD %s %s%s\n", getIndent(depth), fieldMapping.getObfName(), fieldMapping.getObfDesc().toString(),
                                 fieldMapping.getModifier() == Mappings.EntryModifier.UNCHANGED ? "" : fieldMapping.getModifier().getFormattedName());
                 else
-                        out.format("%sFIELD %s %s %s%s\n", getIndent(depth), fieldMapping.getObfName(), fieldMapping.getDeobfName(), fieldMapping.getObfType().toString(),
+                        out.format("%sFIELD %s %s %s%s\n", getIndent(depth), fieldMapping.getObfName(), fieldMapping.getDeobfName(), fieldMapping.getObfDesc().toString(),
                                 fieldMapping.getModifier() == Mappings.EntryModifier.UNCHANGED ? "" : fieldMapping.getModifier().getFormattedName());
         }
 
         private void write(PrintWriter out, MethodMapping methodMapping, int depth) throws IOException {
                 if (methodMapping.getDeobfName() == null) {
-                        out.format("%sMETHOD %s %s%s\n", getIndent(depth), methodMapping.getObfName(), methodMapping.getObfSignature(),
+                        out.format("%sMETHOD %s %s%s\n", getIndent(depth), methodMapping.getObfName(), methodMapping.getObfDesc(),
                                 methodMapping.getModifier() == Mappings.EntryModifier.UNCHANGED ? "" : methodMapping.getModifier().getFormattedName());
                 } else {
-                        out.format("%sMETHOD %s %s %s%s\n", getIndent(depth), methodMapping.getObfName(), methodMapping.getDeobfName(), methodMapping.getObfSignature(),
+                        out.format("%sMETHOD %s %s %s%s\n", getIndent(depth), methodMapping.getObfName(), methodMapping.getDeobfName(), methodMapping.getObfDesc(),
                                 methodMapping.getModifier() == Mappings.EntryModifier.UNCHANGED ? "" : methodMapping.getModifier().getFormattedName());
                 }
 
-                for (ArgumentMapping argumentMapping : sorted(methodMapping.arguments())) {
-                        write(out, argumentMapping, depth + 1);
+                for (LocalVariableMapping localVariableMapping : sorted(methodMapping.arguments())) {
+                        write(out, localVariableMapping, depth + 1);
                 }
         }
 
-        private void write(PrintWriter out, ArgumentMapping argumentMapping, int depth) {
-                out.format("%sARG %d %s\n", getIndent(depth), argumentMapping.getIndex(), argumentMapping.getName());
+        private void write(PrintWriter out, LocalVariableMapping localVariableMapping, int depth) {
+                out.format("%sARG %d %s\n", getIndent(depth), localVariableMapping.getIndex(), localVariableMapping.getName());
         }
 
         private <T extends Comparable<T>> List<T> sorted(Iterable<T> classes) {
diff --git a/src/main/java/cuchaz/enigma/mapping/MappingsRenamer.java b/src/main/java/cuchaz/enigma/mapping/MappingsRenamer.java
index 7126d2b..e215a0f 100644
--- a/src/main/java/cuchaz/enigma/mapping/MappingsRenamer.java
+++ b/src/main/java/cuchaz/enigma/mapping/MappingsRenamer.java
@@ -25,12 +25,14 @@ import java.util.zip.GZIPOutputStream;
 
 public class MappingsRenamer {
 
-        private JarIndex index;
+        private final JarIndex index;
+        private final ReferencedEntryPool entryPool;
         private Mappings mappings;
 
-        public MappingsRenamer(JarIndex index, Mappings mappings) {
+        public MappingsRenamer(JarIndex index, Mappings mappings, ReferencedEntryPool entryPool) {
                 this.index = index;
                 this.mappings = mappings;
+                this.entryPool = entryPool;
         }
 
         public void setMappings(Mappings mappings) {
@@ -46,7 +48,7 @@ public class MappingsRenamer {
 
                         if (deobfName != null) {
                                 // make sure we don't rename to an existing obf or deobf class
-                                if (mappings.containsDeobfClass(deobfName) || index.containsObfClass(new ClassEntry(deobfName))) {
+                                if (mappings.containsDeobfClass(deobfName) || index.containsObfClass(entryPool.getClass(deobfName))) {
                                         throw new IllegalNameException(deobfName, "There is already a class with that name");
                                 }
                         }
@@ -87,13 +89,13 @@ public class MappingsRenamer {
 
         public void setFieldName(FieldEntry obf, String deobfName) {
                 deobfName = NameValidator.validateFieldName(deobfName);
-                FieldEntry targetEntry = new FieldEntry(obf.getClassEntry(), deobfName, obf.getType());
+                FieldEntry targetEntry = entryPool.getField(obf.getOwnerClassEntry(), deobfName, obf.getDesc());
                 ClassEntry definedClass = null;
-                if (mappings.containsDeobfField(obf.getClassEntry(), deobfName) || index.containsEntryWithSameName(targetEntry))
-                        definedClass = obf.getClassEntry();
+                if (mappings.containsDeobfField(obf.getOwnerClassEntry(), deobfName) || index.containsEntryWithSameName(targetEntry))
+                        definedClass = obf.getOwnerClassEntry();
                 else {
-                        for (ClassEntry ancestorEntry : this.index.getTranslationIndex().getAncestry(obf.getClassEntry())) {
-                                if (mappings.containsDeobfField(ancestorEntry, deobfName) || index.containsEntryWithSameName(targetEntry.cloneToNewClass(ancestorEntry))) {
+                        for (ClassEntry ancestorEntry : this.index.getTranslationIndex().getAncestry(obf.getOwnerClassEntry())) {
+                                if (mappings.containsDeobfField(ancestorEntry, deobfName) || index.containsEntryWithSameName(targetEntry.updateOwnership(ancestorEntry))) {
                                         definedClass = ancestorEntry;
                                         break;
                                 }
@@ -101,42 +103,44 @@ public class MappingsRenamer {
                 }
 
                 if (definedClass != null) {
-                        String className = mappings.getTranslator(TranslationDirection.Deobfuscating, index.getTranslationIndex()).translateClass(definedClass.getClassName());
+                        Translator translator = mappings.getTranslator(TranslationDirection.DEOBFUSCATING, index.getTranslationIndex());
+                        String className = translator.getTranslatedClass(entryPool.getClass(definedClass.getClassName())).getName();
                         if (className == null)
                                 className = definedClass.getClassName();
                         throw new IllegalNameException(deobfName, "There is already a field with that name in " + className);
                 }
 
-                ClassMapping classMapping = getOrCreateClassMapping(obf.getClassEntry());
-                classMapping.setFieldName(obf.getName(), obf.getType(), deobfName);
+                ClassMapping classMapping = getOrCreateClassMapping(obf.getOwnerClassEntry());
+                classMapping.setFieldName(obf.getName(), obf.getDesc(), deobfName);
         }
 
         public void removeFieldMapping(FieldEntry obf) {
-                ClassMapping classMapping = getOrCreateClassMapping(obf.getClassEntry());
-                classMapping.removeFieldMapping(classMapping.getFieldByObf(obf.getName(), obf.getType()));
+                ClassMapping classMapping = getOrCreateClassMapping(obf.getOwnerClassEntry());
+                classMapping.removeFieldMapping(classMapping.getFieldByObf(obf.getName(), obf.getDesc()));
         }
 
         public void markFieldAsDeobfuscated(FieldEntry obf) {
-                ClassMapping classMapping = getOrCreateClassMapping(obf.getClassEntry());
-                classMapping.setFieldName(obf.getName(), obf.getType(), obf.getName());
+                ClassMapping classMapping = getOrCreateClassMapping(obf.getOwnerClassEntry());
+                classMapping.setFieldName(obf.getName(), obf.getDesc(), obf.getName());
         }
 
         private void validateMethodTreeName(MethodEntry entry, String deobfName) {
-                MethodEntry targetEntry = new MethodEntry(entry.getClassEntry(), deobfName, entry.getSignature());
+                MethodEntry targetEntry = entryPool.getMethod(entry.getOwnerClassEntry(), deobfName, entry.getDesc());
 
                 // TODO: Verify if I don't break things
-                ClassMapping classMapping = mappings.getClassByObf(entry.getClassEntry());
-                if ((classMapping != null && classMapping.containsDeobfMethod(deobfName, entry.getSignature()) && classMapping.getMethodByObf(entry.getName(), entry.getSignature()) != classMapping.getMethodByDeobf(deobfName, entry.getSignature()))
-                        || index.containsObfBehavior(targetEntry)) {
-                        String deobfClassName = mappings.getTranslator(TranslationDirection.Deobfuscating, index.getTranslationIndex()).translateClass(entry.getClassName());
+                ClassMapping classMapping = mappings.getClassByObf(entry.getOwnerClassEntry());
+                if ((classMapping != null && classMapping.containsDeobfMethod(deobfName, entry.getDesc()) && classMapping.getMethodByObf(entry.getName(), entry.getDesc()) != classMapping.getMethodByDeobf(deobfName, entry.getDesc()))
+                                || index.containsObfMethod(targetEntry)) {
+                        Translator translator = mappings.getTranslator(TranslationDirection.DEOBFUSCATING, index.getTranslationIndex());
+                        String deobfClassName = translator.getTranslatedClass(entryPool.getClass(entry.getClassName())).getClassName();
                         if (deobfClassName == null) {
                                 deobfClassName = entry.getClassName();
                         }
                         throw new IllegalNameException(deobfName, "There is already a method with that name and signature in class " + deobfClassName);
                 }
 
-                for (ClassEntry child : index.getTranslationIndex().getSubclass(entry.getClassEntry())) {
-                        validateMethodTreeName(entry.cloneToNewClass(child), deobfName);
+                for (ClassEntry child : index.getTranslationIndex().getSubclass(entry.getOwnerClassEntry())) {
+                        validateMethodTreeName(entry.updateOwnership(child), deobfName);
                 }
         }
 
@@ -155,20 +159,21 @@ public class MappingsRenamer {
 
         public void setMethodName(MethodEntry obf, String deobfName) {
                 deobfName = NameValidator.validateMethodName(deobfName);
-                MethodEntry targetEntry = new MethodEntry(obf.getClassEntry(), deobfName, obf.getSignature());
-                ClassMapping classMapping = getOrCreateClassMapping(obf.getClassEntry());
+                MethodEntry targetEntry = entryPool.getMethod(obf.getOwnerClassEntry(), deobfName, obf.getDesc());
+                ClassMapping classMapping = getOrCreateClassMapping(obf.getOwnerClassEntry());
 
                 // TODO: Verify if I don't break things
-                if ((mappings.containsDeobfMethod(obf.getClassEntry(), deobfName, obf.getSignature()) && classMapping.getMethodByObf(obf.getName(), obf.getSignature()) != classMapping.getMethodByDeobf(deobfName, obf.getSignature()))
-                        || index.containsObfBehavior(targetEntry)) {
-                        String deobfClassName = mappings.getTranslator(TranslationDirection.Deobfuscating, index.getTranslationIndex()).translateClass(obf.getClassName());
+                if ((mappings.containsDeobfMethod(obf.getOwnerClassEntry(), deobfName, obf.getDesc()) && classMapping.getMethodByObf(obf.getName(), obf.getDesc()) != classMapping.getMethodByDeobf(deobfName, obf.getDesc()))
+                                || index.containsObfMethod(targetEntry)) {
+                        Translator translator = mappings.getTranslator(TranslationDirection.DEOBFUSCATING, index.getTranslationIndex());
+                        String deobfClassName = translator.getTranslatedClass(entryPool.getClass(obf.getClassName())).getClassName();
                         if (deobfClassName == null) {
                                 deobfClassName = obf.getClassName();
                         }
                         throw new IllegalNameException(deobfName, "There is already a method with that name and signature in class " + deobfClassName);
                 }
 
-                classMapping.setMethodName(obf.getName(), obf.getSignature(), deobfName);
+                classMapping.setMethodName(obf.getName(), obf.getDesc(), deobfName);
         }
 
         public void removeMethodTreeMapping(MethodEntry obf) {
@@ -176,8 +181,8 @@ public class MappingsRenamer {
         }
 
         public void removeMethodMapping(MethodEntry obf) {
-                ClassMapping classMapping = getOrCreateClassMapping(obf.getClassEntry());
-                classMapping.setMethodName(obf.getName(), obf.getSignature(), null);
+                ClassMapping classMapping = getOrCreateClassMapping(obf.getOwnerClassEntry());
+                classMapping.setMethodName(obf.getName(), obf.getDesc(), null);
         }
 
         public void markMethodTreeAsDeobfuscated(MethodEntry obf) {
@@ -185,30 +190,25 @@ public class MappingsRenamer {
         }
 
         public void markMethodAsDeobfuscated(MethodEntry obf) {
-                ClassMapping classMapping = getOrCreateClassMapping(obf.getClassEntry());
-                classMapping.setMethodName(obf.getName(), obf.getSignature(), obf.getName());
+                ClassMapping classMapping = getOrCreateClassMapping(obf.getOwnerClassEntry());
+                classMapping.setMethodName(obf.getName(), obf.getDesc(), obf.getName());
         }
 
-        public void setArgumentTreeName(ArgumentEntry obf, String deobfName) {
-                if (!(obf.getBehaviorEntry() instanceof MethodEntry)) {
-                        setArgumentName(obf, deobfName);
-                        return;
-                }
-
-                MethodEntry obfMethod = (MethodEntry) obf.getBehaviorEntry();
+        public void setLocalVariableTreeName(LocalVariableEntry obf, String deobfName) {
+                MethodEntry obfMethod = obf.getOwnerEntry();
 
                 Set<MethodEntry> implementations = index.getRelatedMethodImplementations(obfMethod);
                 for (MethodEntry entry : implementations) {
-                        ClassMapping classMapping = mappings.getClassByObf(entry.getClassEntry());
+                        ClassMapping classMapping = mappings.getClassByObf(entry.getOwnerClassEntry());
                         if (classMapping != null) {
-                                MethodMapping mapping = classMapping.getMethodByObf(entry.getName(), entry.getSignature());
+                                MethodMapping mapping = classMapping.getMethodByObf(entry.getName(), entry.getDesc());
                                 // NOTE: don't need to check arguments for name collisions with names determined by Procyon
                                 // TODO: Verify if I don't break things
                                 if (mapping != null) {
-                                        for (ArgumentMapping argumentMapping : Lists.newArrayList(mapping.arguments())) {
-                                                if (argumentMapping.getIndex() != obf.getIndex()) {
-                                                        if (mapping.getDeobfArgumentName(argumentMapping.getIndex()).equals(deobfName)
-                                                                || argumentMapping.getName().equals(deobfName)) {
+                                        for (LocalVariableMapping localVariableMapping : Lists.newArrayList(mapping.arguments())) {
+                                                if (localVariableMapping.getIndex() != obf.getIndex()) {
+                                                        if (mapping.getDeobfLocalVariableName(localVariableMapping.getIndex()).equals(deobfName)
+                                                                        || localVariableMapping.getName().equals(deobfName)) {
                                                                 throw new IllegalNameException(deobfName, "There is already an argument with that name");
                                                         }
                                                 }
@@ -218,45 +218,45 @@ public class MappingsRenamer {
                 }
 
                 for (MethodEntry entry : implementations) {
-                        setArgumentName(new ArgumentEntry(obf, entry), deobfName);
+                        setLocalVariableName(new LocalVariableEntry(entry, obf.getIndex(), obf.getName()), deobfName);
                 }
         }
 
-        public void setArgumentName(ArgumentEntry obf, String deobfName) {
+        public void setLocalVariableName(LocalVariableEntry obf, String deobfName) {
                 deobfName = NameValidator.validateArgumentName(deobfName);
-                ClassMapping classMapping = getOrCreateClassMapping(obf.getClassEntry());
-                MethodMapping mapping = classMapping.getMethodByObf(obf.getMethodName(), obf.getMethodSignature());
+                ClassMapping classMapping = getOrCreateClassMapping(obf.getOwnerClassEntry());
+                MethodMapping mapping = classMapping.getMethodByObf(obf.getMethodName(), obf.getMethodDesc());
                 // NOTE: don't need to check arguments for name collisions with names determined by Procyon
                 // TODO: Verify if I don't break things
                 if (mapping != null) {
-                        for (ArgumentMapping argumentMapping : Lists.newArrayList(mapping.arguments())) {
-                                if (argumentMapping.getIndex() != obf.getIndex()) {
-                                        if (mapping.getDeobfArgumentName(argumentMapping.getIndex()).equals(deobfName)
-                                                || argumentMapping.getName().equals(deobfName)) {
+                        for (LocalVariableMapping localVariableMapping : Lists.newArrayList(mapping.arguments())) {
+                                if (localVariableMapping.getIndex() != obf.getIndex()) {
+                                        if (mapping.getDeobfLocalVariableName(localVariableMapping.getIndex()).equals(deobfName)
+                                                        || localVariableMapping.getName().equals(deobfName)) {
                                                 throw new IllegalNameException(deobfName, "There is already an argument with that name");
                                         }
                                 }
                         }
                 }
 
-                classMapping.setArgumentName(obf.getMethodName(), obf.getMethodSignature(), obf.getIndex(), deobfName);
+                classMapping.setArgumentName(obf.getMethodName(), obf.getMethodDesc(), obf.getIndex(), deobfName);
         }
 
-        public void removeArgumentMapping(ArgumentEntry obf) {
-                ClassMapping classMapping = getOrCreateClassMapping(obf.getClassEntry());
-                classMapping.removeArgumentName(obf.getMethodName(), obf.getMethodSignature(), obf.getIndex());
+        public void removeLocalVariableMapping(LocalVariableEntry obf) {
+                ClassMapping classMapping = getOrCreateClassMapping(obf.getOwnerClassEntry());
+                classMapping.removeArgumentName(obf.getMethodName(), obf.getMethodDesc(), obf.getIndex());
         }
 
-        public void markArgumentAsDeobfuscated(ArgumentEntry obf) {
-                ClassMapping classMapping = getOrCreateClassMapping(obf.getClassEntry());
-                classMapping.setArgumentName(obf.getMethodName(), obf.getMethodSignature(), obf.getIndex(), obf.getName());
+        public void markArgumentAsDeobfuscated(LocalVariableEntry obf) {
+                ClassMapping classMapping = getOrCreateClassMapping(obf.getOwnerClassEntry());
+                classMapping.setArgumentName(obf.getMethodName(), obf.getMethodDesc(), obf.getIndex(), obf.getName());
         }
 
         public boolean moveFieldToObfClass(ClassMapping classMapping, FieldMapping fieldMapping, ClassEntry obfClass) {
                 classMapping.removeFieldMapping(fieldMapping);
                 ClassMapping targetClassMapping = getOrCreateClassMapping(obfClass);
-                if (!targetClassMapping.containsObfField(fieldMapping.getObfName(), fieldMapping.getObfType())) {
-                        if (!targetClassMapping.containsDeobfField(fieldMapping.getDeobfName(), fieldMapping.getObfType())) {
+                if (!targetClassMapping.containsObfField(fieldMapping.getObfName(), fieldMapping.getObfDesc())) {
+                        if (!targetClassMapping.containsDeobfField(fieldMapping.getDeobfName(), fieldMapping.getObfDesc())) {
                                 targetClassMapping.addFieldMapping(fieldMapping);
                                 return true;
                         } else {
@@ -269,12 +269,12 @@ public class MappingsRenamer {
         public boolean moveMethodToObfClass(ClassMapping classMapping, MethodMapping methodMapping, ClassEntry obfClass) {
                 classMapping.removeMethodMapping(methodMapping);
                 ClassMapping targetClassMapping = getOrCreateClassMapping(obfClass);
-                if (!targetClassMapping.containsObfMethod(methodMapping.getObfName(), methodMapping.getObfSignature())) {
-                        if (!targetClassMapping.containsDeobfMethod(methodMapping.getDeobfName(), methodMapping.getObfSignature())) {
+                if (!targetClassMapping.containsObfMethod(methodMapping.getObfName(), methodMapping.getObfDesc())) {
+                        if (!targetClassMapping.containsDeobfMethod(methodMapping.getDeobfName(), methodMapping.getObfDesc())) {
                                 targetClassMapping.addMethodMapping(methodMapping);
                                 return true;
                         } else {
-                                System.err.println("WARNING: deobf method was already there: " + obfClass + "." + methodMapping.getDeobfName() + methodMapping.getObfSignature());
+                                System.err.println("WARNING: deobf method was already there: " + obfClass + "." + methodMapping.getDeobfName() + methodMapping.getObfDesc());
                         }
                 }
                 return false;
@@ -326,12 +326,35 @@ public class MappingsRenamer {
         }
 
         public void setFieldModifier(FieldEntry obEntry, Mappings.EntryModifier modifier) {
-                ClassMapping classMapping = getOrCreateClassMapping(obEntry.getClassEntry());
-                classMapping.setFieldModifier(obEntry.getName(), obEntry.getType(), modifier);
+                ClassMapping classMapping = getOrCreateClassMapping(obEntry.getOwnerClassEntry());
+                classMapping.setFieldModifier(obEntry.getName(), obEntry.getDesc(), modifier);
+        }
+
+        public void setMethodModifier(MethodEntry obEntry, Mappings.EntryModifier modifier) {
+                ClassMapping classMapping = getOrCreateClassMapping(obEntry.getOwnerClassEntry());
+                classMapping.setMethodModifier(obEntry.getName(), obEntry.getDesc(), modifier);
+        }
+
+        public Mappings.EntryModifier getClassModifier(ClassEntry obfEntry) {
+                ClassMapping classMapping = getOrCreateClassMapping(obfEntry);
+                return classMapping.getModifier();
         }
 
-        public void setMethodModifier(BehaviorEntry obEntry, Mappings.EntryModifier modifier) {
-                ClassMapping classMapping = getOrCreateClassMapping(obEntry.getClassEntry());
-                classMapping.setMethodModifier(obEntry.getName(), obEntry.getSignature(), modifier);
+        public Mappings.EntryModifier getFieldModifier(FieldEntry obfEntry) {
+                ClassMapping classMapping = getOrCreateClassMapping(obfEntry.getOwnerClassEntry());
+                FieldMapping fieldMapping = classMapping.getFieldByObf(obfEntry);
+                if (fieldMapping == null) {
+                        return Mappings.EntryModifier.UNCHANGED;
+                }
+                return fieldMapping.getModifier();
+        }
+
+        public Mappings.EntryModifier getMethodModfifier(MethodEntry obfEntry) {
+                ClassMapping classMapping = getOrCreateClassMapping(obfEntry.getOwnerClassEntry());
+                MethodMapping methodMapping = classMapping.getMethodByObf(obfEntry);
+                if (methodMapping == null) {
+                        return Mappings.EntryModifier.UNCHANGED;
+                }
+                return methodMapping.getModifier();
         }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/MappingsSRGWriter.java b/src/main/java/cuchaz/enigma/mapping/MappingsSRGWriter.java
index b0eb826..95daa73 100644
--- a/src/main/java/cuchaz/enigma/mapping/MappingsSRGWriter.java
+++ b/src/main/java/cuchaz/enigma/mapping/MappingsSRGWriter.java
@@ -19,7 +19,7 @@ public class MappingsSRGWriter {
                 }
                 file.createNewFile();
 
-                TranslationIndex index = new TranslationIndex();
+                TranslationIndex index = new TranslationIndex(new ReferencedEntryPool());
 
                 PrintWriter writer = new PrintWriter(new OutputStreamWriter(new FileOutputStream(file), Charsets.UTF_8));
                 List<String> fieldMappings = new ArrayList<>();
@@ -43,7 +43,7 @@ public class MappingsSRGWriter {
                                 }
 
                                 for (MethodMapping methodMapping : sorted(innerClassMapping.methods())) {
-                                        methodMappings.add("MD: " + innerClassName + "/" + methodMapping.getObfName() + " " + methodMapping.getObfSignature() + " " + innerDeobfClassName + "/" + methodMapping.getDeobfName() + " " + mappings.getTranslator(TranslationDirection.Deobfuscating, index).translateSignature(methodMapping.getObfSignature()));
+                                        methodMappings.add("MD: " + innerClassName + "/" + methodMapping.getObfName() + " " + methodMapping.getObfDesc() + " " + innerDeobfClassName + "/" + methodMapping.getDeobfName() + " " + mappings.getTranslator(TranslationDirection.DEOBFUSCATING, index).getTranslatedMethodDesc(methodMapping.getObfDesc()));
                                 }
                         }
 
@@ -52,7 +52,7 @@ public class MappingsSRGWriter {
                         }
 
                         for (MethodMapping methodMapping : sorted(classMapping.methods())) {
-                                methodMappings.add("MD: " + classMapping.getObfFullName() + "/" + methodMapping.getObfName() + " " + methodMapping.getObfSignature() + " " + classMapping.getDeobfName() + "/" + methodMapping.getDeobfName() + " " + mappings.getTranslator(TranslationDirection.Deobfuscating, index).translateSignature(methodMapping.getObfSignature()));
+                                methodMappings.add("MD: " + classMapping.getObfFullName() + "/" + methodMapping.getObfName() + " " + methodMapping.getObfDesc() + " " + classMapping.getDeobfName() + "/" + methodMapping.getDeobfName() + " " + mappings.getTranslator(TranslationDirection.DEOBFUSCATING, index).getTranslatedMethodDesc(methodMapping.getObfDesc()));
                         }
                 }
                 for (String fd : fieldMappings) {
diff --git a/src/main/java/cuchaz/enigma/mapping/MappingsTinyReader.java b/src/main/java/cuchaz/enigma/mapping/MappingsTinyReader.java
index dfe9e88..e635fa1 100644
--- a/src/main/java/cuchaz/enigma/mapping/MappingsTinyReader.java
+++ b/src/main/java/cuchaz/enigma/mapping/MappingsTinyReader.java
@@ -20,11 +20,11 @@ public class MappingsTinyReader {
         }
 
         public FieldMapping readField(String[] parts) {
-                return new FieldMapping(parts[3], new Type(parts[2]), parts[4], Mappings.EntryModifier.UNCHANGED);
+                return new FieldMapping(parts[3], new TypeDescriptor(parts[2]), parts[4], Mappings.EntryModifier.UNCHANGED);
         }
 
         public MethodMapping readMethod(String[] parts) {
-                return new MethodMapping(parts[3], new Signature(parts[2]), parts[4]);
+                return new MethodMapping(parts[3], new MethodDescriptor(parts[2]), parts[4]);
         }
 
         public Mappings read(File file) throws IOException, MappingParseException {
diff --git a/src/main/java/cuchaz/enigma/mapping/MethodDefEntry.java b/src/main/java/cuchaz/enigma/mapping/MethodDefEntry.java
new file mode 100644
index 0000000..d6a160d
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/mapping/MethodDefEntry.java
@@ -0,0 +1,35 @@
+/*******************************************************************************
+ * 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.mapping;
+
+import com.google.common.base.Preconditions;
+import cuchaz.enigma.bytecode.AccessFlags;
+
+public class MethodDefEntry extends MethodEntry {
+
+        private final AccessFlags access;
+
+        public MethodDefEntry(ClassEntry classEntry, String name, MethodDescriptor descriptor, AccessFlags access) {
+                super(classEntry, name, descriptor);
+                Preconditions.checkNotNull(access, "Method access cannot be null");
+                this.access = access;
+        }
+
+        public AccessFlags getAccess() {
+                return access;
+        }
+
+        @Override
+        public MethodDefEntry updateOwnership(ClassEntry classEntry) {
+                return new MethodDefEntry(new ClassEntry(classEntry.getName()), name, descriptor, access);
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/mapping/MethodDescriptor.java b/src/main/java/cuchaz/enigma/mapping/MethodDescriptor.java
new file mode 100644
index 0000000..210ada0
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/mapping/MethodDescriptor.java
@@ -0,0 +1,113 @@
+/*******************************************************************************
+ * 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.mapping;
+
+import com.google.common.collect.Lists;
+import cuchaz.enigma.utils.Utils;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Function;
+
+public class MethodDescriptor {
+
+        private List<TypeDescriptor> argumentDescs;
+        private TypeDescriptor returnDesc;
+
+        public MethodDescriptor(String desc) {
+                try {
+                        this.argumentDescs = Lists.newArrayList();
+                        int i = 0;
+                        while (i < desc.length()) {
+                                char c = desc.charAt(i);
+                                if (c == '(') {
+                                        assert (this.argumentDescs.isEmpty());
+                                        assert (this.returnDesc == null);
+                                        i++;
+                                } else if (c == ')') {
+                                        i++;
+                                        break;
+                                } else {
+                                        String type = TypeDescriptor.parseFirst(desc.substring(i));
+                                        this.argumentDescs.add(new TypeDescriptor(type));
+                                        i += type.length();
+                                }
+                        }
+                        this.returnDesc = new TypeDescriptor(TypeDescriptor.parseFirst(desc.substring(i)));
+                } catch (Exception ex) {
+                        throw new IllegalArgumentException("Unable to parse method descriptor: " + desc, ex);
+                }
+        }
+
+        public MethodDescriptor(List<TypeDescriptor> argumentDescs, TypeDescriptor returnDesc) {
+                this.argumentDescs = argumentDescs;
+                this.returnDesc = returnDesc;
+        }
+
+        public List<TypeDescriptor> getArgumentDescs() {
+                return this.argumentDescs;
+        }
+
+        public TypeDescriptor getReturnDesc() {
+                return this.returnDesc;
+        }
+
+        @Override
+        public String toString() {
+                StringBuilder buf = new StringBuilder();
+                buf.append("(");
+                for (TypeDescriptor desc : this.argumentDescs) {
+                        buf.append(desc);
+                }
+                buf.append(")");
+                buf.append(this.returnDesc);
+                return buf.toString();
+        }
+
+        public Iterable<TypeDescriptor> types() {
+                List<TypeDescriptor> descs = Lists.newArrayList();
+                descs.addAll(this.argumentDescs);
+                descs.add(this.returnDesc);
+                return descs;
+        }
+
+        @Override
+        public boolean equals(Object other) {
+                return other instanceof MethodDescriptor && equals((MethodDescriptor) other);
+        }
+
+        public boolean equals(MethodDescriptor other) {
+                return this.argumentDescs.equals(other.argumentDescs) && this.returnDesc.equals(other.returnDesc);
+        }
+
+        @Override
+        public int hashCode() {
+                return Utils.combineHashesOrdered(this.argumentDescs.hashCode(), this.returnDesc.hashCode());
+        }
+
+        public boolean hasClass(ClassEntry classEntry) {
+                for (TypeDescriptor desc : types()) {
+                        if (desc.containsType() && desc.getOwnerEntry().equals(classEntry)) {
+                                return true;
+                        }
+                }
+                return false;
+        }
+
+        public MethodDescriptor remap(Function<String, String> remapper) {
+                List<TypeDescriptor> argumentDescs = new ArrayList<>(this.argumentDescs.size());
+                for (TypeDescriptor desc : this.argumentDescs) {
+                        argumentDescs.add(desc.remap(remapper));
+                }
+                return new MethodDescriptor(argumentDescs, returnDesc.remap(remapper));
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/mapping/MethodEntry.java b/src/main/java/cuchaz/enigma/mapping/MethodEntry.java
index 9c3058c..f8a5ff1 100644
--- a/src/main/java/cuchaz/enigma/mapping/MethodEntry.java
+++ b/src/main/java/cuchaz/enigma/mapping/MethodEntry.java
@@ -11,41 +11,27 @@
 
 package cuchaz.enigma.mapping;
 
+import com.google.common.base.Preconditions;
 import cuchaz.enigma.utils.Utils;
 
-public class MethodEntry implements BehaviorEntry {
-
-        private ClassEntry classEntry;
-        private String name;
-        private Signature signature;
-
-        public MethodEntry(ClassEntry classEntry, String name, Signature signature) {
-                if (classEntry == null) {
-                        throw new IllegalArgumentException("Class cannot be null!");
-                }
-                if (name == null) {
-                        throw new IllegalArgumentException("Method name cannot be null!");
-                }
-                if (signature == null) {
-                        throw new IllegalArgumentException("Method signature cannot be null!");
-                }
-                if (name.startsWith("<")) {
-                        throw new IllegalArgumentException("Don't use MethodEntry for a constructor!");
-                }
+public class MethodEntry implements Entry {
+
+        protected final ClassEntry classEntry;
+        protected final String name;
+        protected final MethodDescriptor descriptor;
+
+        public MethodEntry(ClassEntry classEntry, String name, MethodDescriptor descriptor) {
+                Preconditions.checkNotNull(classEntry, "Class cannot be null");
+                Preconditions.checkNotNull(name, "Method name cannot be null");
+                Preconditions.checkNotNull(descriptor, "Method descriptor cannot be null");
 
                 this.classEntry = classEntry;
                 this.name = name;
-                this.signature = signature;
-        }
-
-        public MethodEntry(MethodEntry other, String newClassName) {
-                this.classEntry = new ClassEntry(newClassName);
-                this.name = other.name;
-                this.signature = other.signature;
+                this.descriptor = descriptor;
         }
 
         @Override
-        public ClassEntry getClassEntry() {
+        public ClassEntry getOwnerClassEntry() {
                 return this.classEntry;
         }
 
@@ -54,9 +40,12 @@ public class MethodEntry implements BehaviorEntry {
                 return this.name;
         }
 
-        @Override
-        public Signature getSignature() {
-                return this.signature;
+        public MethodDescriptor getDesc() {
+                return this.descriptor;
+        }
+
+        public boolean isConstructor() {
+                return name.equals("<init>") || name.equals("<clinit>");
         }
 
         @Override
@@ -65,13 +54,13 @@ public class MethodEntry implements BehaviorEntry {
         }
 
         @Override
-        public MethodEntry cloneToNewClass(ClassEntry classEntry) {
-                return new MethodEntry(this, classEntry.getName());
+        public MethodEntry updateOwnership(ClassEntry classEntry) {
+                return new MethodEntry(new ClassEntry(classEntry.getName()), name, descriptor);
         }
 
         @Override
         public int hashCode() {
-                return Utils.combineHashesOrdered(this.classEntry, this.name, this.signature);
+                return Utils.combineHashesOrdered(this.classEntry, this.name, this.descriptor);
         }
 
         @Override
@@ -80,11 +69,11 @@ public class MethodEntry implements BehaviorEntry {
         }
 
         public boolean equals(MethodEntry other) {
-                return this.classEntry.equals(other.classEntry) && this.name.equals(other.name) && this.signature.equals(other.signature);
+                return this.classEntry.equals(other.getOwnerClassEntry()) && this.name.equals(other.getName()) && this.descriptor.equals(other.getDesc());
         }
 
         @Override
         public String toString() {
-                return this.classEntry.getName() + "." + this.name + this.signature;
+                return this.classEntry.getName() + "." + this.name + this.descriptor;
         }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/MethodMapping.java b/src/main/java/cuchaz/enigma/mapping/MethodMapping.java
index 1524ce6..2f7fe53 100644
--- a/src/main/java/cuchaz/enigma/mapping/MethodMapping.java
+++ b/src/main/java/cuchaz/enigma/mapping/MethodMapping.java
@@ -11,50 +11,47 @@
 
 package cuchaz.enigma.mapping;
 
+import com.google.common.base.Preconditions;
 import com.google.common.collect.Maps;
 import cuchaz.enigma.throwables.IllegalNameException;
 import cuchaz.enigma.throwables.MappingConflict;
 
 import java.util.Map;
 
-public class MethodMapping implements Comparable<MethodMapping>, MemberMapping<BehaviorEntry> {
+public class MethodMapping implements Comparable<MethodMapping>, MemberMapping<MethodEntry> {
 
         private String obfName;
         private String deobfName;
-        private Signature obfSignature;
-        private Map<Integer, ArgumentMapping> arguments;
+        private MethodDescriptor obfDescriptor;
+        private Map<Integer, LocalVariableMapping> localVariables;
         private Mappings.EntryModifier modifier;
 
-        public MethodMapping(String obfName, Signature obfSignature) {
-                this(obfName, obfSignature, null, Mappings.EntryModifier.UNCHANGED);
+        public MethodMapping(String obfName, MethodDescriptor obfDescriptor) {
+                this(obfName, obfDescriptor, null, Mappings.EntryModifier.UNCHANGED);
         }
 
-        public MethodMapping(String obfName, Signature obfSignature, String deobfName) {
-                this(obfName, obfSignature, deobfName, Mappings.EntryModifier.UNCHANGED);
+        public MethodMapping(String obfName, MethodDescriptor obfDescriptor, String deobfName) {
+                this(obfName, obfDescriptor, deobfName, Mappings.EntryModifier.UNCHANGED);
         }
 
-        public MethodMapping(String obfName, Signature obfSignature, String deobfName, Mappings.EntryModifier modifier) {
-                if (obfName == null) {
-                        throw new IllegalArgumentException("obf name cannot be null!");
-                }
-                if (obfSignature == null) {
-                        throw new IllegalArgumentException("obf signature cannot be null!");
-                }
+        public MethodMapping(String obfName, MethodDescriptor obfDescriptor, String deobfName, Mappings.EntryModifier modifier) {
+                Preconditions.checkNotNull(obfName, "Method obf name cannot be null");
+                Preconditions.checkNotNull(obfDescriptor, "Method obf desc cannot be null");
                 this.obfName = obfName;
                 this.deobfName = NameValidator.validateMethodName(deobfName);
-                this.obfSignature = obfSignature;
-                this.arguments = Maps.newTreeMap();
+                this.obfDescriptor = obfDescriptor;
+                this.localVariables = Maps.newTreeMap();
                 this.modifier = modifier;
         }
 
-        public MethodMapping(MethodMapping other, ClassNameReplacer obfClassNameReplacer) {
+        public MethodMapping(MethodMapping other, Translator translator) {
                 this.obfName = other.obfName;
                 this.deobfName = other.deobfName;
                 this.modifier = other.modifier;
-                this.obfSignature = new Signature(other.obfSignature, obfClassNameReplacer);
-                this.arguments = Maps.newTreeMap();
-                for (Map.Entry<Integer, ArgumentMapping> entry : other.arguments.entrySet()) {
-                        this.arguments.put(entry.getKey(), new ArgumentMapping(entry.getValue()));
+                this.obfDescriptor = translator.getTranslatedMethodDesc(other.obfDescriptor);
+                this.localVariables = Maps.newTreeMap();
+                for (Map.Entry<Integer, LocalVariableMapping> entry : other.localVariables.entrySet()) {
+                        this.localVariables.put(entry.getKey(), new LocalVariableMapping(entry.getValue()));
                 }
         }
 
@@ -84,56 +81,56 @@ public class MethodMapping implements Comparable<MethodMapping>, MemberMapping<B
                 this.deobfName = NameValidator.validateMethodName(val);
         }
 
-        public Signature getObfSignature() {
-                return this.obfSignature;
+        public MethodDescriptor getObfDesc() {
+                return this.obfDescriptor;
         }
 
-        public void setObfSignature(Signature val) {
-                this.obfSignature = val;
+        public void setObfDescriptor(MethodDescriptor val) {
+                this.obfDescriptor = val;
         }
 
-        public Iterable<ArgumentMapping> arguments() {
-                return this.arguments.values();
+        public Iterable<LocalVariableMapping> arguments() {
+                return this.localVariables.values();
         }
 
-        public void addArgumentMapping(ArgumentMapping argumentMapping) throws MappingConflict {
-                if (this.arguments.containsKey(argumentMapping.getIndex())) {
-                        throw new MappingConflict("argument", argumentMapping.getName(), this.arguments.get(argumentMapping.getIndex()).getName());
+        public void addArgumentMapping(LocalVariableMapping localVariableMapping) throws MappingConflict {
+                if (this.localVariables.containsKey(localVariableMapping.getIndex())) {
+                        throw new MappingConflict("argument", localVariableMapping.getName(), this.localVariables.get(localVariableMapping.getIndex()).getName());
                 }
-                this.arguments.put(argumentMapping.getIndex(), argumentMapping);
+                this.localVariables.put(localVariableMapping.getIndex(), localVariableMapping);
         }
 
-        public String getObfArgumentName(int index) {
-                ArgumentMapping argumentMapping = this.arguments.get(index);
-                if (argumentMapping != null) {
-                        return argumentMapping.getName();
+        public String getObfLocalVariableName(int index) {
+                LocalVariableMapping localVariableMapping = this.localVariables.get(index);
+                if (localVariableMapping != null) {
+                        return localVariableMapping.getName();
                 }
 
                 return null;
         }
 
-        public String getDeobfArgumentName(int index) {
-                ArgumentMapping argumentMapping = this.arguments.get(index);
-                if (argumentMapping != null) {
-                        return argumentMapping.getName();
+        public String getDeobfLocalVariableName(int index) {
+                LocalVariableMapping localVariableMapping = this.localVariables.get(index);
+                if (localVariableMapping != null) {
+                        return localVariableMapping.getName();
                 }
 
                 return null;
         }
 
-        public void setArgumentName(int index, String name) {
-                ArgumentMapping argumentMapping = this.arguments.get(index);
-                if (argumentMapping == null) {
-                        argumentMapping = new ArgumentMapping(index, name);
-                        boolean wasAdded = this.arguments.put(index, argumentMapping) == null;
+        public void setLocalVariableName(int index, String name) {
+                LocalVariableMapping localVariableMapping = this.localVariables.get(index);
+                if (localVariableMapping == null) {
+                        localVariableMapping = new LocalVariableMapping(index, name);
+                        boolean wasAdded = this.localVariables.put(index, localVariableMapping) == null;
                         assert (wasAdded);
                 } else {
-                        argumentMapping.setName(name);
+                        localVariableMapping.setName(name);
                 }
         }
 
-        public void removeArgumentName(int index) {
-                boolean wasRemoved = this.arguments.remove(index) != null;
+        public void removeLocalVariableName(int index) {
+                boolean wasRemoved = this.localVariables.remove(index) != null;
                 assert (wasRemoved);
         }
 
@@ -146,14 +143,14 @@ public class MethodMapping implements Comparable<MethodMapping>, MemberMapping<B
                 buf.append(this.deobfName);
                 buf.append("\n");
                 buf.append("\t");
-                buf.append(this.obfSignature);
+                buf.append(this.obfDescriptor);
                 buf.append("\n");
-                buf.append("\tArguments:\n");
-                for (ArgumentMapping argumentMapping : this.arguments.values()) {
+                buf.append("\tLocal Variables:\n");
+                for (LocalVariableMapping localVariableMapping : this.localVariables.values()) {
                         buf.append("\t\t");
-                        buf.append(argumentMapping.getIndex());
+                        buf.append(localVariableMapping.getIndex());
                         buf.append(" -> ");
-                        buf.append(argumentMapping.getName());
+                        buf.append(localVariableMapping.getName());
                         buf.append("\n");
                 }
                 return buf.toString();
@@ -161,12 +158,12 @@ public class MethodMapping implements Comparable<MethodMapping>, MemberMapping<B
 
         @Override
         public int compareTo(MethodMapping other) {
-                return (this.obfName + this.obfSignature).compareTo(other.obfName + other.obfSignature);
+                return (this.obfName + this.obfDescriptor).compareTo(other.obfName + other.obfDescriptor);
         }
 
-        public boolean containsArgument(String name) {
-                for (ArgumentMapping argumentMapping : this.arguments.values()) {
-                        if (argumentMapping.getName().equals(name)) {
+        public boolean containsLocalVariable(String name) {
+                for (LocalVariableMapping localVariableMapping : this.localVariables.values()) {
+                        if (localVariableMapping.getName().equals(name)) {
                                 return true;
                         }
                 }
@@ -175,32 +172,23 @@ public class MethodMapping implements Comparable<MethodMapping>, MemberMapping<B
 
         public boolean renameObfClass(final String oldObfClassName, final String newObfClassName) {
                 // rename obf classes in the signature
-                Signature newSignature = new Signature(this.obfSignature, className ->
-                {
+                MethodDescriptor newDescriptor = obfDescriptor.remap(className -> {
                         if (className.equals(oldObfClassName)) {
                                 return newObfClassName;
                         }
-                        return null;
+                        return className;
                 });
 
-                if (!newSignature.equals(this.obfSignature)) {
-                        this.obfSignature = newSignature;
+                if (!newDescriptor.equals(this.obfDescriptor)) {
+                        this.obfDescriptor = newDescriptor;
                         return true;
                 }
                 return false;
         }
 
-        public boolean isConstructor() {
-                return this.obfName.startsWith("<");
-        }
-
         @Override
-        public BehaviorEntry getObfEntry(ClassEntry classEntry) {
-                if (isConstructor()) {
-                        return new ConstructorEntry(classEntry, this.obfSignature);
-                } else {
-                        return new MethodEntry(classEntry, this.obfName, this.obfSignature);
-                }
+        public MethodEntry getObfEntry(ClassEntry classEntry) {
+                return new MethodEntry(classEntry, this.obfName, this.obfDescriptor);
         }
 
         public Mappings.EntryModifier getModifier() {
diff --git a/src/main/java/cuchaz/enigma/mapping/NameValidator.java b/src/main/java/cuchaz/enigma/mapping/NameValidator.java
index aa3dc4d..f178093 100644
--- a/src/main/java/cuchaz/enigma/mapping/NameValidator.java
+++ b/src/main/java/cuchaz/enigma/mapping/NameValidator.java
@@ -12,7 +12,6 @@
 package cuchaz.enigma.mapping;
 
 import cuchaz.enigma.throwables.IllegalNameException;
-import javassist.bytecode.Descriptor;
 
 import java.util.Arrays;
 import java.util.List;
@@ -23,11 +22,11 @@ public class NameValidator {
         private static final Pattern IdentifierPattern;
         private static final Pattern ClassPattern;
         private static final List<String> ReservedWords = Arrays.asList(
-                "abstract", "continue", "for", "new", "switch", "assert", "default", "goto", "package", "synchronized",
-                "boolean", "do", "if", "private", "this", "break", "double", "implements", "protected", "throw", "byte",
-                "else", "import", "public", "throws", "case", "enum", "instanceof", "return", "transient", "catch",
-                "extends", "int", "short", "try", "char", "final", "interface", "static", "void", "class", "finally",
-                "long", "strictfp", "volatile", "const", "float", "native", "super", "while"
+                        "abstract", "continue", "for", "new", "switch", "assert", "default", "goto", "package", "synchronized",
+                        "boolean", "do", "if", "private", "this", "break", "double", "implements", "protected", "throw", "byte",
+                        "else", "import", "public", "throws", "case", "enum", "instanceof", "return", "transient", "catch",
+                        "extends", "int", "short", "try", "char", "final", "interface", "static", "void", "class", "finally",
+                        "long", "strictfp", "volatile", "const", "float", "native", "super", "while"
         );
 
         static {
@@ -43,10 +42,10 @@ public class NameValidator {
                 if (!ClassPattern.matcher(name).matches() || ReservedWords.contains(name)) {
                         throw new IllegalNameException(name, "This doesn't look like a legal class name");
                 }
-                if (packageRequired && new ClassEntry(name).getPackageName() == null) {
+                if (packageRequired && ClassEntry.getPackageName(name) == null) {
                         throw new IllegalNameException(name, "Class must be in a package");
                 }
-                return Descriptor.toJvmName(name);
+                return name;
         }
 
         public static String validateFieldName(String name) {
diff --git a/src/main/java/cuchaz/enigma/mapping/ProcyonEntryFactory.java b/src/main/java/cuchaz/enigma/mapping/ProcyonEntryFactory.java
index 33d930d..9300656 100644
--- a/src/main/java/cuchaz/enigma/mapping/ProcyonEntryFactory.java
+++ b/src/main/java/cuchaz/enigma/mapping/ProcyonEntryFactory.java
@@ -12,12 +12,18 @@
 package cuchaz.enigma.mapping;
 
 import com.strobel.assembler.metadata.*;
+import cuchaz.enigma.bytecode.AccessFlags;
 
 import java.util.List;
 
 public class ProcyonEntryFactory {
+        private final ReferencedEntryPool entryPool;
 
-        private static String getErasedSignature(MemberReference def) {
+        public ProcyonEntryFactory(ReferencedEntryPool entryPool) {
+                this.entryPool = entryPool;
+        }
+
+        private String getErasedSignature(MemberReference def) {
                 if (!(def instanceof MethodReference))
                         return def.getErasedSignature();
                 MethodReference methodReference = (MethodReference) def;
@@ -41,27 +47,23 @@ public class ProcyonEntryFactory {
                 return builder.toString();
         }
 
-        public static FieldEntry getFieldEntry(MemberReference def) {
-                return new FieldEntry(new ClassEntry(def.getDeclaringType().getInternalName()), def.getName(), new Type(def.getErasedSignature()));
+        public FieldEntry getFieldEntry(MemberReference def) {
+                ClassEntry classEntry = entryPool.getClass(def.getDeclaringType().getInternalName());
+                return entryPool.getField(classEntry, def.getName(), def.getErasedSignature());
         }
 
-        public static MethodEntry getMethodEntry(MemberReference def) {
-                return new MethodEntry(new ClassEntry(def.getDeclaringType().getInternalName()), def.getName(), new Signature(getErasedSignature(def)));
+        public FieldDefEntry getFieldDefEntry(FieldDefinition def) {
+                ClassEntry classEntry = entryPool.getClass(def.getDeclaringType().getInternalName());
+                return new FieldDefEntry(classEntry, def.getName(), new TypeDescriptor(def.getErasedSignature()), new AccessFlags(def.getModifiers()));
         }
 
-        public static ConstructorEntry getConstructorEntry(MethodReference def) {
-                if (def.isTypeInitializer()) {
-                        return new ConstructorEntry(new ClassEntry(def.getDeclaringType().getInternalName()));
-                } else {
-                        return new ConstructorEntry(new ClassEntry(def.getDeclaringType().getInternalName()), new Signature(def.getErasedSignature()));
-                }
+        public MethodEntry getMethodEntry(MemberReference def) {
+                ClassEntry classEntry = entryPool.getClass(def.getDeclaringType().getInternalName());
+                return entryPool.getMethod(classEntry, def.getName(), getErasedSignature(def));
         }
 
-        public static BehaviorEntry getBehaviorEntry(MethodReference def) {
-                if (def.isConstructor() || def.isTypeInitializer()) {
-                        return getConstructorEntry(def);
-                } else {
-                        return getMethodEntry(def);
-                }
+        public MethodDefEntry getMethodDefEntry(MethodDefinition def) {
+                ClassEntry classEntry = entryPool.getClass(def.getDeclaringType().getInternalName());
+                return new MethodDefEntry(classEntry, def.getName(), new MethodDescriptor(def.getErasedSignature()), new AccessFlags(def.getModifiers()));
         }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/ReferencedEntryPool.java b/src/main/java/cuchaz/enigma/mapping/ReferencedEntryPool.java
new file mode 100644
index 0000000..2abc76c
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/mapping/ReferencedEntryPool.java
@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * 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.mapping;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class ReferencedEntryPool {
+        private final Map<String, ClassEntry> classEntries = new HashMap<>();
+        private final Map<String, Map<String, MethodEntry>> methodEntries = new HashMap<>();
+        private final Map<String, Map<String, FieldEntry>> fieldEntries = new HashMap<>();
+
+        public ClassEntry getClass(String name) {
+                return this.classEntries.computeIfAbsent(name, s -> new ClassEntry(name));
+        }
+
+        public MethodEntry getMethod(ClassEntry ownerEntry, String name, String desc) {
+                return getMethod(ownerEntry, name, new MethodDescriptor(desc));
+        }
+
+        public MethodEntry getMethod(ClassEntry ownerEntry, String name, MethodDescriptor desc) {
+                String key = name + desc.toString();
+                return getClassMethods(ownerEntry.getName()).computeIfAbsent(key, s -> new MethodEntry(ownerEntry, name, desc));
+        }
+
+        public FieldEntry getField(ClassEntry ownerEntry, String name, String desc) {
+                return getField(ownerEntry, name, new TypeDescriptor(desc));
+        }
+
+        public FieldEntry getField(ClassEntry ownerEntry, String name, TypeDescriptor desc) {
+                return getClassFields(ownerEntry.getName()).computeIfAbsent(name, s -> new FieldEntry(ownerEntry, name, desc));
+        }
+
+        private Map<String, MethodEntry> getClassMethods(String name) {
+                return methodEntries.computeIfAbsent(name, s -> new HashMap<>());
+        }
+
+        private Map<String, FieldEntry> getClassFields(String name) {
+                return fieldEntries.computeIfAbsent(name, s -> new HashMap<>());
+        }
+}
diff --git a/src/main/java/cuchaz/enigma/mapping/Signature.java b/src/main/java/cuchaz/enigma/mapping/Signature.java
deleted file mode 100644
index 78130d6..0000000
--- a/src/main/java/cuchaz/enigma/mapping/Signature.java
+++ /dev/null
@@ -1,106 +0,0 @@
-/*******************************************************************************
- * 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.mapping;
-
-import com.google.common.collect.Lists;
-import cuchaz.enigma.utils.Utils;
-
-import java.util.List;
-
-public class Signature {
-
-        private List<Type> argumentTypes;
-        private Type returnType;
-
-        public Signature(String signature) {
-                try {
-                        this.argumentTypes = Lists.newArrayList();
-                        int i = 0;
-                        while (i < signature.length()) {
-                                char c = signature.charAt(i);
-                                if (c == '(') {
-                                        assert (this.argumentTypes.isEmpty());
-                                        assert (this.returnType == null);
-                                        i++;
-                                } else if (c == ')') {
-                                        i++;
-                                        break;
-                                } else {
-                                        String type = Type.parseFirst(signature.substring(i));
-                                        this.argumentTypes.add(new Type(type));
-                                        i += type.length();
-                                }
-                        }
-                        this.returnType = new Type(Type.parseFirst(signature.substring(i)));
-                } catch (Exception ex) {
-                        throw new IllegalArgumentException("Unable to parse signature: " + signature, ex);
-                }
-        }
-
-        public Signature(Signature other, ClassNameReplacer replacer) {
-                this.argumentTypes = Lists.newArrayList(other.argumentTypes);
-                for (int i = 0; i < this.argumentTypes.size(); i++) {
-                        this.argumentTypes.set(i, new Type(this.argumentTypes.get(i), replacer));
-                }
-                this.returnType = new Type(other.returnType, replacer);
-        }
-
-        public List<Type> getArgumentTypes() {
-                return this.argumentTypes;
-        }
-
-        public Type getReturnType() {
-                return this.returnType;
-        }
-
-        @Override
-        public String toString() {
-                StringBuilder buf = new StringBuilder();
-                buf.append("(");
-                for (Type type : this.argumentTypes) {
-                        buf.append(type);
-                }
-                buf.append(")");
-                buf.append(this.returnType);
-                return buf.toString();
-        }
-
-        public Iterable<Type> types() {
-                List<Type> types = Lists.newArrayList();
-                types.addAll(this.argumentTypes);
-                types.add(this.returnType);
-                return types;
-        }
-
-        @Override
-        public boolean equals(Object other) {
-                return other instanceof Signature && equals((Signature) other);
-        }
-
-        public boolean equals(Signature other) {
-                return this.argumentTypes.equals(other.argumentTypes) && this.returnType.equals(other.returnType);
-        }
-
-        @Override
-        public int hashCode() {
-                return Utils.combineHashesOrdered(this.argumentTypes.hashCode(), this.returnType.hashCode());
-        }
-
-        public boolean hasClass(ClassEntry classEntry) {
-                for (Type type : types()) {
-                        if (type.hasClass() && type.getClassEntry().equals(classEntry)) {
-                                return true;
-                        }
-                }
-                return false;
-        }
-}
diff --git a/src/main/java/cuchaz/enigma/mapping/TranslationDirection.java b/src/main/java/cuchaz/enigma/mapping/TranslationDirection.java
index 17e3187..4bbde54 100644
--- a/src/main/java/cuchaz/enigma/mapping/TranslationDirection.java
+++ b/src/main/java/cuchaz/enigma/mapping/TranslationDirection.java
@@ -13,15 +13,21 @@ package cuchaz.enigma.mapping;
 
 public enum TranslationDirection {
 
-        Deobfuscating {
+        DEOBFUSCATING {
                 @Override
                 public <T> T choose(T deobfChoice, T obfChoice) {
+                        if (deobfChoice == null) {
+                                return obfChoice;
+                        }
                         return deobfChoice;
                 }
         },
-        Obfuscating {
+        OBFUSCATING {
                 @Override
                 public <T> T choose(T deobfChoice, T obfChoice) {
+                        if (obfChoice == null) {
+                                return deobfChoice;
+                        }
                         return obfChoice;
                 }
         };
diff --git a/src/main/java/cuchaz/enigma/mapping/Translator.java b/src/main/java/cuchaz/enigma/mapping/Translator.java
index 8d464fc..59bdf1a 100644
--- a/src/main/java/cuchaz/enigma/mapping/Translator.java
+++ b/src/main/java/cuchaz/enigma/mapping/Translator.java
@@ -11,332 +11,50 @@
 
 package cuchaz.enigma.mapping;
 
-import com.google.common.collect.Lists;
-import com.google.common.collect.Maps;
-import cuchaz.enigma.analysis.TranslationIndex;
+public interface Translator {
+        ClassEntry getTranslatedClass(ClassEntry entry);
 
-import java.util.List;
-import java.util.Map;
+        ClassDefEntry getTranslatedClassDef(ClassDefEntry entry);
 
-public class Translator {
+        FieldEntry getTranslatedField(FieldEntry entry);
 
-        private TranslationDirection direction;
-        private Map<String, ClassMapping> classes;
-        private TranslationIndex index;
+        FieldDefEntry getTranslatedFieldDef(FieldDefEntry entry);
 
-        private ClassNameReplacer classNameReplacer = className -> translateEntry(new ClassEntry(className)).getName();
+        MethodEntry getTranslatedMethod(MethodEntry entry);
 
-        public Translator() {
-                this.direction = null;
-                this.classes = Maps.newHashMap();
-                this.index = new TranslationIndex();
-        }
+        MethodDefEntry getTranslatedMethodDef(MethodDefEntry entry);
 
-        public Translator(TranslationDirection direction, Map<String, ClassMapping> classes, TranslationIndex index) {
-                this.direction = direction;
-                this.classes = classes;
-                this.index = index;
-        }
+        LocalVariableEntry getTranslatedVariable(LocalVariableEntry entry);
 
-        public TranslationDirection getDirection() {
-                return direction;
-        }
+        LocalVariableDefEntry getTranslatedVariableDef(LocalVariableDefEntry entry);
 
-        public TranslationIndex getTranslationIndex() {
-                return index;
-        }
+        TypeDescriptor getTranslatedTypeDesc(TypeDescriptor desc);
 
-        @SuppressWarnings("unchecked")
-        public <T extends Entry> T translateEntry(T entry) {
-                if (entry instanceof ClassEntry) {
-                        return (T) translateEntry((ClassEntry) entry);
-                } else if (entry instanceof FieldEntry) {
-                        return (T) translateEntry((FieldEntry) entry);
-                } else if (entry instanceof MethodEntry) {
-                        return (T) translateEntry((MethodEntry) entry);
-                } else if (entry instanceof ConstructorEntry) {
-                        return (T) translateEntry((ConstructorEntry) entry);
-                } else if (entry instanceof ArgumentEntry) {
-                        return (T) translateEntry((ArgumentEntry) entry);
-                } else if (entry instanceof LocalVariableEntry) {
-                        return (T) translateEntry((LocalVariableEntry) entry);
-                } else {
-                        throw new Error("Unknown entry type: " + entry.getClass().getName());
-                }
-        }
+        MethodDescriptor getTranslatedMethodDesc(MethodDescriptor descriptor);
 
-        public <T extends Entry> String translate(T entry) {
-                if (entry instanceof ClassEntry) {
-                        return translate((ClassEntry) entry);
+        @SuppressWarnings("unchecked")
+        default <T extends Entry> T getTranslatedEntry(T entry) {
+                if (entry instanceof ClassDefEntry) {
+                        return (T) getTranslatedClassDef((ClassDefEntry) entry);
+                } else if (entry instanceof ClassEntry) {
+                        return (T) getTranslatedClass((ClassEntry) entry);
+                } else if (entry instanceof FieldDefEntry) {
+                        return (T) getTranslatedFieldDef((FieldDefEntry) entry);
+                } else if (entry instanceof MethodDefEntry) {
+                        return (T) getTranslatedMethodDef((MethodDefEntry) entry);
                 } else if (entry instanceof FieldEntry) {
-                        return translate((FieldEntry) entry);
+                        return (T) getTranslatedField((FieldEntry) entry);
                 } else if (entry instanceof MethodEntry) {
-                        return translate((MethodEntry) entry);
-                } else if (entry instanceof ConstructorEntry) {
-                        return translate(entry);
-                } else if (entry instanceof ArgumentEntry) {
-                        return translate((ArgumentEntry) entry);
+                        return (T) getTranslatedMethod((MethodEntry) entry);
+                } else if (entry instanceof LocalVariableDefEntry) {
+                        return (T) getTranslatedVariableDef((LocalVariableDefEntry) entry);
                 } else if (entry instanceof LocalVariableEntry) {
-                        return translate((LocalVariableEntry) entry);
-                } else {
-                        throw new Error("Unknown entry type: " + entry.getClass().getName());
-                }
-        }
-
-        public String translate(LocalVariableEntry in) {
-                LocalVariableEntry translated = translateEntry(in);
-                if (translated.equals(in)) {
-                        return null;
-                }
-                return translated.getName();
-        }
-
-        public LocalVariableEntry translateEntry(LocalVariableEntry in) {
-                // TODO: Implement it
-                return in;
-        }
-
-        public String translate(ClassEntry in) {
-                ClassEntry translated = translateEntry(in);
-                if (translated.equals(in)) {
-                        return null;
-                }
-                return translated.getName();
-        }
-
-        public String translateClass(String className) {
-                return translate(new ClassEntry(className));
-        }
-
-        public ClassEntry translateEntry(ClassEntry in) {
-
-                if (in.isInnerClass()) {
-
-                        // translate as much of the class chain as we can
-                        List<ClassMapping> mappingsChain = getClassMappingChain(in);
-                        String[] obfClassNames = in.getName().split("\\$");
-                        StringBuilder buf = new StringBuilder();
-                        for (int i = 0; i < obfClassNames.length; i++) {
-                                boolean isFirstClass = buf.length() == 0;
-                                String className = null;
-                                ClassMapping classMapping = mappingsChain.get(i);
-                                if (classMapping != null) {
-                                        className = this.direction.choose(
-                                                classMapping.getDeobfName(),
-                                                isFirstClass ? classMapping.getObfFullName() : classMapping.getObfSimpleName()
-                                        );
-                                }
-                                if (className == null) {
-                                        className = obfClassNames[i];
-                                }
-                                if (!isFirstClass) {
-                                        buf.append("$");
-                                }
-                                buf.append(className);
-                        }
-                        return new ClassEntry(buf.toString());
-
-                } else {
-
-                        // normal classes are easy
-                        ClassMapping classMapping = this.classes.get(in.getName());
-                        if (classMapping == null) {
-                                return in;
-                        }
-                        return this.direction.choose(
-                                classMapping.getDeobfName() != null ? new ClassEntry(classMapping.getDeobfName()) : in,
-                                new ClassEntry(classMapping.getObfFullName())
-                        );
-                }
-        }
-
-        public String translate(FieldEntry in) {
-
-                // resolve the class entry
-                ClassEntry resolvedClassEntry = this.index.resolveEntryClass(in);
-                if (resolvedClassEntry != null) {
-
-                        // look for the class
-                        ClassMapping classMapping = findClassMapping(resolvedClassEntry);
-                        if (classMapping != null) {
-
-                                // look for the field
-                                String translatedName = this.direction.choose(
-                                        classMapping.getDeobfFieldName(in.getName(), in.getType()),
-                                        classMapping.getObfFieldName(in.getName(), translateType(in.getType()))
-                                );
-                                if (translatedName != null) {
-                                        return translatedName;
-                                }
-                        }
-                }
-                return null;
-        }
-
-        public FieldEntry translateEntry(FieldEntry in) {
-                String name = translate(in);
-                if (name == null) {
-                        name = in.getName();
-                }
-                return new FieldEntry(translateEntry(in.getClassEntry()), name, translateType(in.getType()));
-        }
-
-        public String translate(MethodEntry in) {
-                // resolve the class entry
-                ClassEntry resolvedClassEntry = this.index.resolveEntryClass(in, true);
-                if (resolvedClassEntry != null) {
-
-                        // look for class
-                        ClassMapping classMapping = findClassMapping(resolvedClassEntry);
-                        if (classMapping != null) {
-
-                                // look for the method
-                                MethodMapping methodMapping = this.direction.choose(
-                                        classMapping.getMethodByObf(in.getName(), in.getSignature()),
-                                        classMapping.getMethodByDeobf(in.getName(), translateSignature(in.getSignature()))
-                                );
-                                if (methodMapping != null) {
-                                        return this.direction.choose(methodMapping.getDeobfName(), methodMapping.getObfName());
-                                }
-                        }
-                }
-                return null;
-        }
-
-        public MethodEntry translateEntry(MethodEntry in) {
-                String name = translate(in);
-                if (name == null) {
-                        name = in.getName();
-                }
-                return new MethodEntry(translateEntry(in.getClassEntry()), name, translateSignature(in.getSignature()));
-        }
-
-        public ConstructorEntry translateEntry(ConstructorEntry in) {
-                if (in.isStatic()) {
-                        return new ConstructorEntry(translateEntry(in.getClassEntry()));
-                } else {
-                        return new ConstructorEntry(translateEntry(in.getClassEntry()), translateSignature(in.getSignature()));
-                }
-        }
-
-        public BehaviorEntry translateEntry(BehaviorEntry in) {
-                if (in instanceof MethodEntry) {
-                        return translateEntry((MethodEntry) in);
-                } else if (in instanceof ConstructorEntry) {
-                        return translateEntry((ConstructorEntry) in);
-                }
-                throw new Error("Wrong entry type!");
-        }
-
-        // TODO: support not identical behavior (specific to constructor)
-        public String translate(ArgumentEntry in) {
-                String classTranslate = translateArgument(in);
-
-                // Not found in this class
-                if (classTranslate == null) {
-                        List<ClassEntry> ancestry = this.index.getAncestry(in.getClassEntry());
-
-                        // Check in mother class for the arg
-                        for (ClassEntry entry : ancestry) {
-                                ArgumentEntry motherArg = in.cloneToNewClass(entry);
-                                if (this.index.entryExists(motherArg)) {
-                                        String result = translateArgument(motherArg);
-                                        if (result != null)
-                                                return result;
-                                }
-                        }
-                }
-                return classTranslate;
-        }
-
-        public String translateArgument(ArgumentEntry in) {
-                // look for identical behavior in superclasses
-                ClassEntry entry = in.getClassEntry();
-
-                if (entry != null) {
-                        // look for the class
-                        ClassMapping classMapping = findClassMapping(entry);
-                        if (classMapping != null) {
-
-                                // look for the method
-                                MethodMapping methodMapping = this.direction.choose(
-                                        classMapping.getMethodByObf(in.getMethodName(), in.getMethodSignature()),
-                                        classMapping.getMethodByDeobf(in.getMethodName(), translateSignature(in.getMethodSignature()))
-                                );
-                                if (methodMapping != null) {
-                                        return this.direction.choose(
-                                                methodMapping.getDeobfArgumentName(in.getIndex()),
-                                                methodMapping.getObfArgumentName(in.getIndex())
-                                        );
-                                }
-                        }
-                }
-                return null;
-        }
-
-        public ArgumentEntry translateEntry(ArgumentEntry in) {
-                String name = translate(in);
-                if (name == null) {
-                        name = in.getName();
-                }
-                return new ArgumentEntry(translateEntry(in.getBehaviorEntry()), in.getIndex(), name);
-        }
-
-        public Type translateType(Type type) {
-                return new Type(type, this.classNameReplacer);
-        }
-
-        public Signature translateSignature(Signature signature) {
-                return new Signature(signature, this.classNameReplacer);
-        }
-
-        private ClassMapping findClassMapping(ClassEntry in) {
-                List<ClassMapping> mappingChain = getClassMappingChain(in);
-                return mappingChain.get(mappingChain.size() - 1);
-        }
-
-        private List<ClassMapping> getClassMappingChain(ClassEntry in) {
-
-                // get a list of all the classes in the hierarchy
-                String[] parts = in.getName().split("\\$");
-                List<ClassMapping> mappingsChain = Lists.newArrayList();
-
-                // get mappings for the outer class
-                ClassMapping outerClassMapping = this.classes.get(parts[0]);
-                mappingsChain.add(outerClassMapping);
-
-                for (int i = 1; i < parts.length; i++) {
-
-                        // get mappings for the inner class
-                        ClassMapping innerClassMapping = null;
-                        if (outerClassMapping != null) {
-                                innerClassMapping = this.direction.choose(
-                                        outerClassMapping.getInnerClassByObfSimple(parts[i]),
-                                        outerClassMapping.getInnerClassByDeobfThenObfSimple(parts[i])
-                                );
-                        }
-                        mappingsChain.add(innerClassMapping);
-                        outerClassMapping = innerClassMapping;
-                }
-
-                assert (mappingsChain.size() == parts.length);
-                return mappingsChain;
-        }
-
-        public Mappings.EntryModifier getModifier(Entry entry) {
-                ClassMapping classMapping = findClassMapping(entry.getClassEntry());
-                if (classMapping != null && !entry.getName().equals("<clinit>")) {
-                        if (entry instanceof ClassEntry)
-                                return classMapping.getModifier();
-                        else if (entry instanceof FieldEntry) {
-                                FieldMapping fieldMapping = classMapping.getFieldByObf(entry.getName(), ((FieldEntry) entry).getType());
-                                return fieldMapping != null ? fieldMapping.getModifier() : Mappings.EntryModifier.UNCHANGED;
-                        } else if (entry instanceof BehaviorEntry) {
-                                MethodMapping methodMapping = classMapping.getMethodByObf(entry.getName(), ((BehaviorEntry) entry).getSignature());
-                                return methodMapping != null ? methodMapping.getModifier() : Mappings.EntryModifier.UNCHANGED;
-                        } else
-                                throw new Error("Unknown entry type: " + entry.getClass().getName());
+                        return (T) getTranslatedVariable((LocalVariableEntry) entry);
+                } else if (entry instanceof TypeDescriptor) {
+                        return (T) getTranslatedTypeDesc((TypeDescriptor) entry);
+                } else if (entry instanceof MethodDescriptor) {
+                        return (T) getTranslatedMethodDesc((MethodDescriptor) entry);
                 }
-                return Mappings.EntryModifier.UNCHANGED;
+                throw new IllegalArgumentException("Cannot translate unknown entry type");
         }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/TypeDescriptor.java b/src/main/java/cuchaz/enigma/mapping/TypeDescriptor.java
new file mode 100644
index 0000000..9c0fe6d
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/mapping/TypeDescriptor.java
@@ -0,0 +1,240 @@
+/*******************************************************************************
+ * 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.mapping;
+
+import com.google.common.collect.Maps;
+
+import java.util.Map;
+import java.util.function.Function;
+
+public class TypeDescriptor {
+
+        protected final String desc;
+
+        public TypeDescriptor(String desc) {
+                // don't deal with generics
+                // this is just for raw jvm types
+                if (desc.charAt(0) == 'T' || desc.indexOf('<') >= 0 || desc.indexOf('>') >= 0) {
+                        throw new IllegalArgumentException("don't use with generic types or templates: " + desc);
+                }
+
+                this.desc = desc;
+        }
+
+        public static String parseFirst(String in) {
+
+                if (in == null || in.length() <= 0) {
+                        throw new IllegalArgumentException("No desc to parse, input is empty!");
+                }
+
+                // read one desc from the input
+
+                char c = in.charAt(0);
+
+                // first check for void
+                if (c == 'V') {
+                        return "V";
+                }
+
+                // then check for primitives
+                Primitive primitive = Primitive.get(c);
+                if (primitive != null) {
+                        return in.substring(0, 1);
+                }
+
+                // then check for classes
+                if (c == 'L') {
+                        return readClass(in);
+                }
+
+                // then check for templates
+                if (c == 'T') {
+                        return readClass(in);
+                }
+
+                // then check for arrays
+                int dim = countArrayDimension(in);
+                if (dim > 0) {
+                        String arrayType = TypeDescriptor.parseFirst(in.substring(dim));
+                        return in.substring(0, dim + arrayType.length());
+                }
+
+                throw new IllegalArgumentException("don't know how to parse: " + in);
+        }
+
+        private static int countArrayDimension(String in) {
+                int i = 0;
+                while (i < in.length() && in.charAt(i) == '[')
+                        i++;
+                return i;
+        }
+
+        private static String readClass(String in) {
+                // read all the characters in the buffer until we hit a ';'
+                // include the parameters too
+                StringBuilder buf = new StringBuilder();
+                int depth = 0;
+                for (int i = 0; i < in.length(); i++) {
+                        char c = in.charAt(i);
+                        buf.append(c);
+
+                        if (c == '<') {
+                                depth++;
+                        } else if (c == '>') {
+                                depth--;
+                        } else if (depth == 0 && c == ';') {
+                                return buf.toString();
+                        }
+                }
+                return null;
+        }
+
+        public static TypeDescriptor of(String name) {
+                return new TypeDescriptor("L" + name + ";");
+        }
+
+        @Override
+        public String toString() {
+                return this.desc;
+        }
+
+        public boolean isVoid() {
+                return this.desc.length() == 1 && this.desc.charAt(0) == 'V';
+        }
+
+        public boolean isPrimitive() {
+                return this.desc.length() == 1 && Primitive.get(this.desc.charAt(0)) != null;
+        }
+
+        public Primitive getPrimitive() {
+                if (!isPrimitive()) {
+                        throw new IllegalStateException("not a primitive");
+                }
+                return Primitive.get(this.desc.charAt(0));
+        }
+
+        public boolean isType() {
+                return this.desc.charAt(0) == 'L' && this.desc.charAt(this.desc.length() - 1) == ';';
+        }
+
+        public ClassEntry getOwnerEntry() {
+                if (isType()) {
+                        String name = this.desc.substring(1, this.desc.length() - 1);
+
+                        int pos = name.indexOf('<');
+                        if (pos >= 0) {
+                                // remove the parameters from the class name
+                                name = name.substring(0, pos);
+                        }
+
+                        return new ClassEntry(name);
+
+                } else if (isArray() && getArrayType().isType()) {
+                        return getArrayType().getOwnerEntry();
+                } else {
+                        throw new IllegalStateException("desc doesn't have a class");
+                }
+        }
+
+        public boolean isArray() {
+                return this.desc.charAt(0) == '[';
+        }
+
+        public int getArrayDimension() {
+                if (!isArray()) {
+                        throw new IllegalStateException("not an array");
+                }
+                return countArrayDimension(this.desc);
+        }
+
+        public TypeDescriptor getArrayType() {
+                if (!isArray()) {
+                        throw new IllegalStateException("not an array");
+                }
+                return new TypeDescriptor(this.desc.substring(getArrayDimension(), this.desc.length()));
+        }
+
+        public boolean containsType() {
+                return isType() || (isArray() && getArrayType().containsType());
+        }
+
+        @Override
+        public boolean equals(Object other) {
+                return other instanceof TypeDescriptor && equals((TypeDescriptor) other);
+        }
+
+        public boolean equals(TypeDescriptor other) {
+                return this.desc.equals(other.desc);
+        }
+
+        @Override
+        public int hashCode() {
+                return this.desc.hashCode();
+        }
+
+        public TypeDescriptor remap(Function<String, String> remapper) {
+                String desc = this.desc;
+                if (isType() || (isArray() && containsType())) {
+                        String replacedName = remapper.apply(this.getOwnerEntry().getName());
+                        if (replacedName != null) {
+                                if (this.isType()) {
+                                        desc = "L" + replacedName + ";";
+                                } else {
+                                        desc = getArrayPrefix(this.getArrayDimension()) + "L" + replacedName + ";";
+                                }
+                        }
+                }
+                return new TypeDescriptor(desc);
+        }
+
+        private static String getArrayPrefix(int dimension) {
+                StringBuilder buf = new StringBuilder();
+                for (int i = 0; i < dimension; i++) {
+                        buf.append("[");
+                }
+                return buf.toString();
+        }
+
+        public enum Primitive {
+                Byte('B'),
+                Character('C'),
+                Short('S'),
+                Integer('I'),
+                Long('J'),
+                Float('F'),
+                Double('D'),
+                Boolean('Z');
+
+                private static final Map<Character, Primitive> lookup;
+
+                static {
+                        lookup = Maps.newTreeMap();
+                        for (Primitive val : values()) {
+                                lookup.put(val.getCode(), val);
+                        }
+                }
+
+                private char code;
+
+                Primitive(char code) {
+                        this.code = code;
+                }
+
+                public static Primitive get(char code) {
+                        return lookup.get(code);
+                }
+
+                public char getCode() {
+                        return this.code;
+                }
+        }
+}