illegal state exception deob, ff doesnt fully like it yet though

src/main/java/info/sigterm/deob/Method.java

@@ -230,6 +230,12 @@ public class Method
 			code.buildCallGraph();
 	}
 	
+	public void clearCallGraph()
+	{
+		callsTo.clear();
+		callsFrom.clear();
+	}
+	
 	public boolean isUsed()
 	{
 		if (!callsFrom.isEmpty())

src/main/java/info/sigterm/deob/attributes/code/Instructions.java

@@ -98,9 +98,7 @@ public class Instructions
 	
 	public void buildBlocks()
 	{
-		for (Instruction i : instructions)
-			i.block = null;
-		blocks.clear();
+		clearBlockGraph();
 		
 		Block current = null;
 		for (Instruction i : instructions)
@@ -122,6 +120,13 @@ public class Instructions
 		}
 	}
 	
+	public void clearBlockGraph()
+	{
+		for (Instruction i : instructions)
+			i.block = null;
+		blocks.clear();
+	}
+	
 	public void write(DataOutputStream out) throws IOException
 	{
 		// generate pool indexes

src/main/java/info/sigterm/deob/attributes/code/instructions/Goto.java

@@ -24,6 +24,13 @@ public class Goto extends Instruction implements JumpingInstruction
 		length += 2;
 	}
 	
+	public Goto(Instructions instructions, Instruction to)
+	{
+		super(instructions, InstructionType.GOTO, 0);
+		this.to = to;
+		length += 2;
+	}
+	
 	@Override
 	public void resolve()
 	{

src/main/java/info/sigterm/deob/attributes/code/instructions/If.java

@@ -67,4 +67,9 @@ public class If extends Instruction implements JumpingInstruction
 		if (to == oldi)
 			to = newi;
 	}
+	
+	public Instruction getTo()
+	{
+		return to;
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/If0.java

@@ -68,4 +68,9 @@ public class If0 extends Instruction implements JumpingInstruction
 		if (to == oldi)
 			to = newi;
 	}
+	
+	public Instruction getTo()
+	{
+		return to;
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/New.java

@@ -45,4 +45,9 @@ public class New extends Instruction
 		
 		frame.addInstructionContext(ins);
 	}
+	
+	public Class getNewClass()
+	{
+		return clazz;
+	}
 }

src/main/java/info/sigterm/deob/deobfuscators/IllegalStateExceptions.java

@@ -0,0 +1,78 @@
+package info.sigterm.deob.deobfuscators;
+
+import info.sigterm.deob.ClassFile;
+import info.sigterm.deob.ClassGroup;
+import info.sigterm.deob.Method;
+import info.sigterm.deob.attributes.Code;
+import info.sigterm.deob.attributes.code.Instruction;
+import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.attributes.code.instructions.AThrow;
+import info.sigterm.deob.attributes.code.instructions.Goto;
+import info.sigterm.deob.attributes.code.instructions.If;
+import info.sigterm.deob.attributes.code.instructions.If0;
+import info.sigterm.deob.attributes.code.instructions.New;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class IllegalStateExceptions
+{
+	/* find if, new, ..., athrow, replace with goto */
+	public void run(ClassGroup group)
+	{
+		int count = 0;
+		for (ClassFile cf : group.getClasses())
+		{
+			for (Method m : new ArrayList<>(cf.getMethods().getMethods()))
+			{
+				Code c = m.getCode();
+				if (c == null)
+					continue;
+				
+				Instructions instructions = c.getInstructions();
+				instructions.clearBlockGraph();
+				
+				List<Instruction> ilist = instructions.getInstructions();
+				for (int i = 0; i < ilist.size(); ++i)
+				{
+					Instruction ins = ilist.get(i);
+					
+					if (!(ins instanceof If) && !(ins instanceof If0))
+						continue;
+					
+					Instruction ins2 = ilist.get(i + 1);
+					if (!(ins2 instanceof New))
+						continue;
+					
+					New new2 = (New) ins2;
+					info.sigterm.deob.pool.Class clazz = new2.getNewClass();
+					if (!clazz.getName().equals("java/lang/IllegalStateException"))
+						continue;
+					
+					Instruction to = null;
+					if (ins instanceof If)
+						to = ((If) ins).getTo();
+					else if (ins instanceof If0)
+						to = ((If0) ins).getTo();
+					
+					// remove up to athrow
+					do
+					{
+						instructions.remove(ins);
+						ins = ilist.get(i); // don't need to ++i because 
+					}
+					while (!(ins instanceof AThrow));
+					
+					// remove athrow
+					instructions.remove(ins);
+					
+					// insert goto
+					ilist.add(i, new Goto(instructions, to));
+					
+					++count;
+				}
+			}
+		}
+		System.out.println("Removed " + count + " illegal state exceptions");
+	}
+}