one/zero? obs arent handling stuff right, add test. now im setting null on instructions some places they fail

src/main/java/net/runelite/deob/Deob.java

@@ -92,9 +92,9 @@ public class Deob
 		{	
 			new MultiplicationDeobfuscator().run(group);
 
-			new MultiplyOneDeobfuscator().run(group);
+			//new MultiplyOneDeobfuscator().run(group);
 
-			new MultiplyZeroDeobfuscator().run(group);
+			//new MultiplyZeroDeobfuscator().run(group);
 			
 			if (last == cur)
 			{

src/main/java/net/runelite/deob/attributes/code/Instructions.java

@@ -84,17 +84,10 @@ public class Instructions
 	
 	public void remove(Instruction ins)
 	{
-//		for (Instruction i : instructions)
-//		{
-//			if (i instanceof JumpingInstruction)
-//			{
-//				JumpingInstruction j = (JumpingInstruction) i;
-//				assert !j.getJumps().contains(ins);
-//			}
-//		}
-		
+		assert ins.getInstructions() == this;
 		ins.remove();
 		instructions.remove(ins);
+		ins.setInstructions(null);
 	}
 	
 	public void remove(Block block)
@@ -293,5 +286,7 @@ public class Instructions
 		
 		for (net.runelite.deob.attributes.code.Exception e : code.getExceptions().getExceptions())
 			e.replace(oldi, newi);
+		
+		oldi.setInstructions(null);
 	}
 }

src/main/java/net/runelite/deob/attributes/code/instructions/SiPush.java

@@ -23,6 +23,12 @@ public class SiPush extends Instruction implements PushConstantInstruction
 		super(instructions, type, pc);
 	}
 	
+	public SiPush(Instructions instructions, short value)
+	{
+		super(instructions, InstructionType.SIPUSH, -1);
+		s = value;
+	}
+	
 	@Override
 	public void load(DataInputStream is) throws IOException
 	{

src/main/java/net/runelite/deob/deobfuscators/arithmetic/ModArith.java

@@ -474,7 +474,15 @@ public class ModArith implements Deobfuscator
 				
 					Pair p = this.guess2(f, col2, set);
 					if (p != null)
+					{
+				
+						if (this.deobfuscatedFields.contains(f))
+							continue;
+						
 						pairs.add(p);
+						
+						this.deobfuscatedFields.add(f);
+					}
 				}
 			}
 	}

src/test/java/net/runelite/deob/deobfuscators/arithmetic/MultiplyOneDeobfuscatorTest.java

@@ -0,0 +1,80 @@
+package net.runelite.deob.deobfuscators.arithmetic;
+
+import net.runelite.deob.ClassGroup;
+import net.runelite.deob.ClassGroupFactory;
+import net.runelite.deob.Deobfuscator;
+import net.runelite.deob.attributes.Code;
+import net.runelite.deob.attributes.code.Instruction;
+import net.runelite.deob.attributes.code.Instructions;
+import net.runelite.deob.attributes.code.instructions.Goto;
+import net.runelite.deob.attributes.code.instructions.IConst_1;
+import net.runelite.deob.attributes.code.instructions.IConst_2;
+import net.runelite.deob.attributes.code.instructions.IConst_3;
+import net.runelite.deob.attributes.code.instructions.ILoad;
+import net.runelite.deob.attributes.code.instructions.IMul;
+import net.runelite.deob.attributes.code.instructions.IStore_0;
+import net.runelite.deob.attributes.code.instructions.If0;
+import net.runelite.deob.attributes.code.instructions.NOP;
+import net.runelite.deob.attributes.code.instructions.SiPush;
+import net.runelite.deob.attributes.code.instructions.VReturn;
+import net.runelite.deob.execution.Execution;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class MultiplyOneDeobfuscatorTest
+{
+	@Test
+	public void test()
+	{
+		ClassGroup group = ClassGroupFactory.generateGroup();
+		Code code = group.findClass("test").findMethod("func").getCode();
+		Instructions ins = code.getInstructions();
+		
+		code.setMaxStack(2);
+		
+		// vars[0] = 3
+		Instruction[] prepareVariables = {
+			new IConst_3(ins),
+			new IStore_0(ins)
+		};
+		
+		for (Instruction i : prepareVariables)
+			ins.addInstruction(i);
+		
+		NOP label = new NOP(ins),
+		    label2 = new NOP(ins);
+		
+		IConst_1 one = new IConst_1(ins);
+		
+		Instruction body[] = {
+			new SiPush(ins, (short) 256),
+			
+			new ILoad(ins, 0),
+			new If0(ins, label),
+			
+			new IConst_2(ins),
+			new Goto(ins, label2),
+			
+			label,
+			one,
+			
+			label2,
+			new IMul(ins),
+			
+			new VReturn(ins)
+		};
+		
+		for (Instruction i : body)
+			ins.addInstruction(i);
+		
+		// check execution runs ok
+		Execution e = new Execution(group);
+		e.populateInitialMethods();
+		e.run();
+		
+		Deobfuscator d = new MultiplyOneDeobfuscator();
+		d.run(group);
+		
+		Assert.assertTrue(one.getInstructions() != null);
+	}
+}