code: public final void pushPair(int v1, int v2)
    {
  
      if (null == m_map)
      {
        m_map = new int[m_blocksize];
        m_mapSize = m_blocksize;
      }
      else
      {
        if ((m_firstFree + 2) >= m_mapSize)
        {
          m_mapSize += m_blocksize;
  
          int newMap[] = new int[m_mapSize];
  
          System.arraycopy(m_map, 0, newMap, 0, m_firstFree);
  
          m_map = newMap;
        }
      }
  
      m_map[m_firstFree] = v1;
      m_map[m_firstFree + 1] = v2;
      m_firstFree += 2;
    }
docs: Push a pair of nodes into the stack.
  Special purpose method for TransformerImpl, pushElemTemplateElement.
  Performance critical.
  
  @param v1 First node to add to vector
  @param v2 Second node to add to vector