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/*******************************************************************************
* Copyright (c) 2014 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Public License v3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/gpl.html
*
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.analysis;
import java.util.List;
import javassist.CannotCompileException;
import javassist.CtClass;
import javassist.CtMethod;
import javassist.NotFoundException;
import javassist.bytecode.AccessFlag;
import javassist.expr.ExprEditor;
import javassist.expr.MethodCall;
import com.beust.jcommander.internal.Lists;
public class BridgeFixer
{
public void fixBridges( CtClass c )
{
// bridge methods are scrubbed and marked as synthetic methods by the obfuscator
// need to figure out which synthetics are bridge methods and restore them
for( CtMethod method : c.getDeclaredMethods() )
{
// skip non-synthetic methods
if( ( method.getModifiers() & AccessFlag.SYNTHETIC ) == 0 )
{
continue;
}
CtMethod bridgedMethod = getBridgedMethod( method );
if( bridgedMethod != null )
{
bridgedMethod.setName( method.getName() );
method.setModifiers( method.getModifiers() | AccessFlag.BRIDGE );
}
}
}
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
// 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
ex.printStackTrace( System.err );
return null;
}
}
}
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