code: @Override
      public void visitCode(Code obj) {
          Method method = getMethod();
          if (prescreen(method)) {
              stack.resetForMethodEntry(this);
              regPriorities.clear();
              int[] parmRegs = RegisterUtils.getParameterRegisters(method);
              for (int reg : parmRegs) {
                  regPriorities.put(Integer.valueOf(reg), Values.NORMAL_BUG_PRIORITY);
              }
              if (!method.isStatic()) {
                  regPriorities.put(Values.ZERO, Values.LOW_BUG_PRIORITY);
              }
              super.visitCode(obj);
          }
      }
docs: implements the visitor to reset the opcode stack
  
  @param obj
  the context object of the currently parsed code block