# File lib/racc/statetransitiontable.rb, line 132
    def gen_goto_tables(t, grammar)
      t.goto_table   = yytable2  = []
      t.goto_check   = yycheck2  = []
      t.goto_pointer = yypgoto   = []
      t.goto_default = yydefgoto = []
      e1 = []
      e2 = []
      grammar.each_nonterminal do |tok|
        tmp = []

        # decide default
        freq = Array.new(@states.size, 0)
        @states.each do |state|
          st = state.goto_table[tok]
          if st
            st = st.ident
            freq[st] += 1
          end
          tmp[state.ident] = st
        end
        max = freq.max
        if max > 1
          default = freq.index(max)
          tmp.map! {|i| default == i ? nil : i }
        else
          default = nil
        end
        yydefgoto.push default

        # delete default value
        tmp.pop until tmp.last or tmp.empty?
        if tmp.compact.empty?
          # only default
          yypgoto.push nil
          next
        end

        addent e1, tmp, (tok.ident - grammar.nonterminal_base), yypgoto
      end
      set_table e1, e2, yytable2, yycheck2, yypgoto
    end