code: @Override
      public void visitCode(Code obj) {
          stack.resetForMethodEntry(this);
          localLabels.clear();
          super.visitCode(obj);
          for (SourceLineAnnotation sla : localLabels.values()) {
              BugInstance bug = new BugInstance(this, BugType.S508C_NO_SETLABELFOR.name(), NORMAL_PRIORITY).addClass(this).addMethod(this);
  
              if (sla != null) {
                  bug.addSourceLine(sla);
              }
  
              bugReporter.reportBug(bug);
          }
      }
docs: implements the visitor to reset the stack
  
  @param obj
  the context object for the currently visited code block