code: public void addEntry(LocalVariable localVar) {
          String varName = localVar.getName();
          if (varName == null) {
              int num = localVar.getNumber();
              varName = num < 0 ? "_" : ("v" + num + '$');
          }
  
          ConstantUTFInfo name = getConstantPool().addConstantUTF(varName);
          ConstantUTFInfo descriptor = 
              getConstantPool().addConstantUTF(localVar.getType().getDescriptor());
          mEntries.add(new Entry(localVar, name, descriptor));
  
          mCleanEntries = null;
      }
docs: Add an entry into the LocalVariableTableAttr.