code: @Override
  	public void sawOpcode(final int seen) {
  		try {
  			stack.precomputation(this);
  
  			if (seen == Const.INVOKEINTERFACE) {
  				processInvokeInterface();
  			} else if (seen == Const.INVOKEVIRTUAL) {
  				processInvokeVirtual();
  			} else if ((seen == Const.ARETURN) && (stack.getStackDepth() > 0)) {
  				OpcodeStack.Item item = stack.getStackItem(0);
  				XField field = item.getXField();
  				if (field != null) {
  					String fieldName = field.getName();
  					fieldsReported.remove(fieldName);
  					if (fieldsReported.isEmpty()) {
  						throw new StopOpcodeParsingException();
  					}
  				}
  			}
  		} finally {
  			stack.sawOpcode(this, seen);
  		}
  	}
docs: overrides the visitor to record all method calls on List fields. If a method
  is not a set based method, remove it from further consideration
  
  @param seen the current opcode parsed.