CrashReportTransformer.java
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/*
* This file is part of LiteLoader.
* Copyright (C) 2012-16 Adam Mummery-Smith
* All Rights Reserved.
*/
package com.mumfrey.liteloader.client.transformers;
import java.util.ListIterator;
import org.spongepowered.asm.lib.Opcodes;
import org.spongepowered.asm.lib.tree.AbstractInsnNode;
import org.spongepowered.asm.lib.tree.ClassNode;
import org.spongepowered.asm.lib.tree.InsnList;
import org.spongepowered.asm.lib.tree.MethodInsnNode;
import org.spongepowered.asm.lib.tree.MethodNode;
import org.spongepowered.asm.lib.tree.VarInsnNode;
import com.mumfrey.liteloader.core.runtime.Obf;
import com.mumfrey.liteloader.transformers.ClassTransformer;
public class CrashReportTransformer extends ClassTransformer
{
@Override
public byte[] transform(String name, String transformedName, byte[] basicClass)
{
if (basicClass != null && (Obf.CrashReport$6.name.equals(name) || Obf.CrashReport$6.obf.equals(name)))
{
try
{
return this.transformCallableJVMFlags(basicClass);
}
catch (Exception ex) {}
}
return basicClass;
}
/**
* Inject the additional callback for populating the crash report into the
* CallableJVMFlags class.
*
* @param basicClass basic class
* @return transformed class
*/
private byte[] transformCallableJVMFlags(byte[] basicClass)
{
ClassNode classNode = this.readClass(basicClass, true);
for (MethodNode method : classNode.methods)
{
if ("<init>".equals(method.name))
{
this.transformCallableJVMFlagsConstructor(method);
}
}
return this.writeClass(classNode);
}
/**
* @param ctor
*/
public void transformCallableJVMFlagsConstructor(MethodNode ctor)
{
InsnList code = new InsnList();
code.add(new VarInsnNode(Opcodes.ALOAD, 1));
code.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "com/mumfrey/liteloader/core/LiteLoader", "populateCrashReport",
"(Ljava/lang/Object;)V", false));
ListIterator<AbstractInsnNode> insns = ctor.instructions.iterator();
while (insns.hasNext())
{
AbstractInsnNode insnNode = insns.next();
if (insnNode.getOpcode() == Opcodes.RETURN)
{
ctor.instructions.insertBefore(insnNode, code);
}
}
}
}