/*
* Forge Mod Loader
* Copyright (c) 2012-2013 cpw.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Lesser Public License v2.1
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
* Contributors:
* cpw - implementation
*/
package cpw.mods.fml.common.asm.transformers.deobf;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
import net.minecraft.launchwrapper.LaunchClassLoader;
import org.apache.logging.log4j.Level;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.commons.Remapper;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.FieldNode;
import com.google.common.base.CharMatcher;
import com.google.common.base.Charsets;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.collect.BiMap;
import com.google.common.collect.ImmutableBiMap;
import com.google.common.collect.ImmutableBiMap.Builder;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.google.common.io.CharSource;
import cpw.mods.fml.relauncher.FMLRelaunchLog;
public class FMLDeobfuscatingRemapper extends Remapper {
public static final FMLDeobfuscatingRemapper INSTANCE = new FMLDeobfuscatingRemapper();
private BiMap<String, String> classNameBiMap;
private Map<String,Map<String,String>> rawFieldMaps;
private Map<String,Map<String,String>> rawMethodMaps;
private Map<String,Map<String,String>> fieldNameMaps;
private Map<String,Map<String,String>> methodNameMaps;
private LaunchClassLoader classLoader;
private static final boolean DEBUG_REMAPPING = Boolean.parseBoolean(System.getProperty("fml.remappingDebug", "false"));
private static final boolean DUMP_FIELD_MAPS = Boolean.parseBoolean(System.getProperty("fml.remappingDebug.dumpFieldMaps", "false")) && DEBUG_REMAPPING;
private static final boolean DUMP_METHOD_MAPS = Boolean.parseBoolean(System.getProperty("fml.remappingDebug.dumpMethodMaps", "false")) && DEBUG_REMAPPING;
private FMLDeobfuscatingRemapper()
{
classNameBiMap=ImmutableBiMap.of();
}
private void load(InputStream in, boolean loadAll) throws IOException {
CharSource srgSource = new LZMAInputSupplier(in).asCharSource(Charsets.UTF_8);
List<String> srgList = srgSource.readLines();
in.close();
rawMethodMaps = Maps.newHashMap();
rawFieldMaps = Maps.newHashMap();
Builder<String, String> builder = ImmutableBiMap.<String,String>builder();
Splitter splitter = Splitter.on(CharMatcher.anyOf(": ")).omitEmptyStrings().trimResults();
for (String line : srgList)
{
String[] parts = Iterables.toArray(splitter.split(line),String.class);
String typ = parts[0];
if ("CL".equals(typ))
{
parseClass(builder, parts);
}
else if ("MD".equals(typ) && loadAll)
{
parseMethod(parts);
}
else if ("FD".equals(typ) && loadAll)
{
parseField(parts);
}
}
classNameBiMap = builder.build();
methodNameMaps = Maps.newHashMapWithExpectedSize(rawMethodMaps.size());
fieldNameMaps = Maps.newHashMapWithExpectedSize(rawFieldMaps.size());
}
public void setup(File mcDir, LaunchClassLoader classLoader, String deobfFileName)
{
this.classLoader = classLoader;
try
{
load(getClass().getResourceAsStream(deobfFileName), true);
}
catch (IOException ioe)
{
throw new RuntimeException(ioe);
}
}
public boolean isRemappedClass(String className)
{
return !map(className).equals(className);
}
private void parseField(String[] parts)
{
String oldSrg = parts[1];
int lastOld = oldSrg.lastIndexOf('/');
String cl = oldSrg.substring(0,lastOld);
String oldName = oldSrg.substring(lastOld+1);
String newSrg = parts[2];
int lastNew = newSrg.lastIndexOf('/');
String newName = newSrg.substring(lastNew+1);
if (!rawFieldMaps.containsKey(cl))
{
rawFieldMaps.put(cl, Maps.<String,String>newHashMap());
}
rawFieldMaps.get(cl).put(oldName + ":null", newName);
}
/*
* Cache the field descriptions for classes so we don't repeatedly reload the same data again and again
*/
private Map<String,Map<String,String>> fieldDescriptions = Maps.newHashMap();
// Cache null values so we don't waste time trying to recompute classes with no field or method maps
private Set<String> negativeCacheMethods = Sets.newHashSet();
private Set<String> negativeCacheFields = Sets.newHashSet();
private void parseClass(Builder<String, String> builder, String[] parts)
{
builder.put(parts[1],parts[2]);
}
private void parseMethod(String[] parts)
{
String oldSrg = parts[1];
int lastOld = oldSrg.lastIndexOf('/');
String cl = oldSrg.substring(0,lastOld);
String oldName = oldSrg.substring(lastOld+1);
String sig = parts[2];
String newSrg = parts[3];
int lastNew = newSrg.lastIndexOf('/');
String newName = newSrg.substring(lastNew+1);
if (!rawMethodMaps.containsKey(cl))
{
rawMethodMaps.put(cl, Maps.<String,String>newHashMap());
}
rawMethodMaps.get(cl).put(oldName+sig, newName);
}
@Override
public String mapFieldName(String owner, String name, String desc)
{
if (classNameBiMap == null || classNameBiMap.isEmpty())
{
return name;
}
Map<String, String> fieldMap = getFieldMap(owner);
return fieldMap!=null && fieldMap.containsKey(name+":"+desc) ? fieldMap.get(name+":"+desc) : name;
}
@Override
public String map(String typeName)
{
if (classNameBiMap == null || classNameBiMap.isEmpty())
{
return typeName;
}
if (classNameBiMap.containsKey(typeName))
{
return classNameBiMap.get(typeName);
}
int dollarIdx = typeName.lastIndexOf('$');
if (dollarIdx > -1)
{
return map(typeName.substring(0, dollarIdx)) + "$" + typeName.substring(dollarIdx + 1);
}
return typeName;
}
public String unmap(String typeName)
{
return typeName;
}
@Override
public String mapMethodName(String owner, String name, String desc)
{
if (classNameBiMap==null || classNameBiMap.isEmpty())
{
return name;
}
Map<String, String> methodMap = getMethodMap(owner);
String methodDescriptor = name+desc;
return methodMap!=null && methodMap.containsKey(methodDescriptor) ? methodMap.get(methodDescriptor) : name;
}
private Map<String,String> getFieldMap(String className)
{
if (!fieldNameMaps.containsKey(className) && !negativeCacheFields.contains(className))
{
findAndMergeSuperMaps(className);
if (!fieldNameMaps.containsKey(className))
{
negativeCacheFields.add(className);
}
if (DUMP_FIELD_MAPS)
{
FMLRelaunchLog.finer("Field map for %s : %s", className, fieldNameMaps.get(className));
}
}
return fieldNameMaps.get(className);
}
private Map<String,String> getMethodMap(String className)
{
if (!methodNameMaps.containsKey(className) && !negativeCacheMethods.contains(className))
{
findAndMergeSuperMaps(className);
if (!methodNameMaps.containsKey(className))
{
negativeCacheMethods.add(className);
}
if (DUMP_METHOD_MAPS)
{
FMLRelaunchLog.finer("Method map for %s : %s", className, methodNameMaps.get(className));
}
}
return methodNameMaps.get(className);
}
private void findAndMergeSuperMaps(String name)
{
try
{
String superName = null;
String[] interfaces = new String[0];
byte[] classBytes = classLoader.getClassBytes(name);
if (classBytes != null)
{
ClassReader cr = new ClassReader(classBytes);
superName = cr.getSuperName();
interfaces = cr.getInterfaces();
}
mergeSuperMaps(name, superName, interfaces);
}
catch (IOException e)
{
e.printStackTrace();
}
}
public void mergeSuperMaps(String name, String superName, String[] interfaces)
{
// System.out.printf("Computing super maps for %s: %s %s\n", name, superName, Arrays.asList(interfaces));
if (classNameBiMap == null || classNameBiMap.isEmpty())
{
return;
}
// Skip Object
if (Strings.isNullOrEmpty(superName))
{
return;
}
List<String> allParents = ImmutableList.<String>builder().add(superName).addAll(Arrays.asList(interfaces)).build();
// generate maps for all parent objects
for (String parentThing : allParents)
{
if (!methodNameMaps.containsKey(parentThing))
{
findAndMergeSuperMaps(parentThing);
}
}
Map<String, String> methodMap = Maps.<String,String>newHashMap();
Map<String, String> fieldMap = Maps.<String,String>newHashMap();
for (String parentThing : allParents)
{
if (methodNameMaps.containsKey(parentThing))
{
methodMap.putAll(methodNameMaps.get(parentThing));
}
if (fieldNameMaps.containsKey(parentThing))
{
fieldMap.putAll(fieldNameMaps.get(parentThing));
}
}
if (rawMethodMaps.containsKey(name))
{
methodMap.putAll(rawMethodMaps.get(name));
}
if (rawFieldMaps.containsKey(name))
{
fieldMap.putAll(rawFieldMaps.get(name));
}
methodNameMaps.put(name, ImmutableMap.copyOf(methodMap));
fieldNameMaps.put(name, ImmutableMap.copyOf(fieldMap));
// System.out.printf("Maps: %s %s\n", name, methodMap);
}
public Set<String> getObfedClasses()
{
return ImmutableSet.copyOf(classNameBiMap.keySet());
}
}