ah, found it. duh.

src/main/java/net/runelite/asm/attributes/code/Instruction.java

@@ -175,11 +175,6 @@ public abstract class Instruction implements Cloneable
 		return length;
 	}
 
-	public String getDesc(Frame frame)
-	{
-		return type.getName() + " at pc " + frame.getPc() + " in " + frame.getMethod().getName() + " " + frame.getMethod().getDescriptor() + " class " + frame.getMethod().getCode().getAttributes().getClassFile().getName();
-	}
-
 	public abstract InstructionContext execute(Frame e);
 	
 	/* does this terminate a block? */

src/main/java/net/runelite/asm/attributes/code/instructions/GetField.java

@@ -42,7 +42,7 @@ public class GetField extends Instruction implements GetFieldInstruction
 	public String toString()
 	{
 		Method m = this.getInstructions().getCode().getAttributes().getMethod();
-		return "getfield " + myField + " in " + m;
+		return "getfield " + myField + " in " + m + " at pc 0x" + Integer.toHexString(this.getPc());
 	}
 	
 	@Override

src/main/java/net/runelite/asm/attributes/code/instructions/InvokeSpecial.java

@@ -118,12 +118,6 @@ public class InvokeSpecial extends Instruction implements InvokeInstruction
 		return "invokespecial " + method + " in " + this.getInstructions().getCode().getAttributes().getMethod();
 	}
 	
-	@Override
-	public String getDesc(Frame frame)
-	{	
-		return "invokespecial " + method.getNameAndType().getDescriptor() + " on " + method.getClassEntry().getName();
-	}
-	
 	@Override
 	public void removeParameter(int idx)
 	{

src/main/java/net/runelite/asm/attributes/code/instructions/InvokeStatic.java

@@ -113,12 +113,6 @@ public class InvokeStatic extends Instruction implements InvokeInstruction
 		return ins;
 	}
 	
-	@Override
-	public String getDesc(Frame frame)
-	{	
-		return "invokestatic " + method.getNameAndType().getDescriptor() + " on " + method.getClassEntry().getName() + " return value " + method.getNameAndType().getDescriptor().getReturnValue();
-	}
-	
 	@Override
 	public void removeParameter(int idx)
 	{

src/main/java/net/runelite/asm/attributes/code/instructions/LDC_W.java

@@ -115,7 +115,7 @@ public class LDC_W extends Instruction implements PushConstantInstruction
 	
 	
 	@Override
-	public String getDesc(Frame frame)
+	public String toString()
 	{
 		return "ldc_w " + value;
 	}

src/main/java/net/runelite/asm/execution/Frame.java

@@ -220,7 +220,7 @@ public class Frame
 			}
 			catch (Throwable ex)
 			{
-				System.err.println("Error executing instruction " + cur.getDesc(this));
+				System.err.println("Error executing instruction " + cur);
 				System.err.println("Frame stack (grows downward):");
 				while (stack.getSize() > 0)
 				{
@@ -228,7 +228,7 @@ public class Frame
 					InstructionContext pushed = stacki.getPushed();
 					Frame frame = pushed.getFrame();
 					
-					System.err.println(pushed.getInstruction().getDesc(frame));
+					System.err.println(pushed.getInstruction());
 				}
 				System.err.println("end of stack");
 				ex.printStackTrace();

src/main/java/net/runelite/asm/execution/StackContext.java

@@ -48,7 +48,6 @@ public class StackContext
 
 	public void addPopped(InstructionContext popped)
 	{
-//		assert ParallellMappingExecutor.returnStacks.contains(this) == false;
 		if (!this.poppeds.contains(popped))
 			this.poppeds.add(popped);
 	}

src/main/java/net/runelite/deob/deobfuscators/UnusedParameters.java

@@ -64,6 +64,8 @@ public class UnusedParameters implements Deobfuscator
 
 	private int processUnused(Execution execution, ClassGroup group)
 	{
+		// XXX maybe only remove parameters at the very end, in the event i want to export a func?
+		
 		int count = 0;
 		
 		for (List<Method> m : unused.keySet())
@@ -163,19 +165,20 @@ public class UnusedParameters implements Deobfuscator
 					
 					ii.removeParameter(paramIndex); // remove parameter from instruction
 					
-					Collection<InstructionContext> ics = invokes.get(i);//execution.getInstructonContexts(i);
+					Collection<InstructionContext> ics = invokes.get(i);
 					assert ics != null;
 					if (ics != null)
 					{
-						InstructionContext ins = ics.toArray(new InstructionContext[0])[0];
+						for (InstructionContext ins : ics)
+						{
+							int pops = signature.size() - paramIndex - 1; // index from top of stack of parameter. 0 is the last parameter
 
-						int pops = signature.size() - paramIndex - 1; // index from top of stack of parameter. 0 is the last parameter
+							StackContext sctx = ins.getPops().get(pops);
+							if (sctx.getPushed().getInstruction().getInstructions() == null)
+								continue;
 
-						StackContext sctx = ins.getPops().get(pops);
+							ins.removeStack(pops); // remove parameter from stack
-						if (sctx.getPushed().getInstruction().getInstructions() == null)
+						}
-							continue;
-
-						ins.removeStack(pops); // remove parameter from stack
 					}
 				}
 			}