code: @Override
      public void visitCode(Code obj) {
          stack.resetForMethodEntry(this);
          super.visitCode(obj);
  
          for (Map.Entry<Integer, RegisterInfo> entry : suspectLocals.entrySet()) {
              RegisterInfo cri = entry.getValue();
              if (!cri.getIgnore()) {
                  reportBug(cri);
              }
  
          }
      }
docs: implements the visitor to reset the stack
  
  @param obj
  the context object of the currently parsed code block