晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/opt/alt/ruby33/share/ruby/ruby_vm/rjit/
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module RubyVM::RJIT
  class CodeBlock
    # @param mem_block [Integer] JIT buffer address
    # @param mem_size  [Integer] JIT buffer size
    # @param outliend  [TrueClass,FalseClass] true for outlined CodeBlock
    def initialize(mem_block:, mem_size:, outlined: false)
      @comments  = Hash.new { |h, k| h[k] = [] } if dump_disasm?
      @mem_block = mem_block
      @mem_size  = mem_size
      @write_pos = 0
      @outlined  = outlined
    end

    # @param asm [RubyVM::RJIT::Assembler]
    def write(asm)
      return 0 if @write_pos + asm.size >= @mem_size

      start_addr = write_addr

      # Write machine code
      C.mprotect_write(@mem_block, @mem_size)
      @write_pos += asm.assemble(start_addr)
      C.mprotect_exec(@mem_block, @mem_size)

      end_addr = write_addr

      # Convert comment indexes to addresses
      asm.comments.each do |index, comments|
        @comments[start_addr + index] += comments if dump_disasm?
      end
      asm.comments.clear

      # Dump disasm if --rjit-dump-disasm
      if C.rjit_opts.dump_disasm && start_addr < end_addr
        dump_disasm(start_addr, end_addr)
      end
      start_addr
    end

    def set_write_addr(addr)
      @write_pos = addr - @mem_block
      @comments.delete(addr) if dump_disasm?
    end

    def with_write_addr(addr)
      old_write_pos = @write_pos
      set_write_addr(addr)
      yield
    ensure
      @write_pos = old_write_pos
    end

    def write_addr
      @mem_block + @write_pos
    end

    def include?(addr)
      (@mem_block...(@mem_block + @mem_size)).include?(addr)
    end

    def dump_disasm(from, to, io: STDOUT, color: true, test: false)
      C.dump_disasm(from, to, test:).each do |address, mnemonic, op_str|
        @comments.fetch(address, []).each do |comment|
          io.puts colorize("  # #{comment}", bold: true, color:)
        end
        io.puts colorize("  0x#{format("%x", address)}: #{mnemonic} #{op_str}", color:)
      end
      io.puts
    end

    private

    def colorize(text, bold: false, color:)
      return text unless color
      buf = +''
      buf << "\e[1m" if bold
      buf << "\e[34m" if @outlined
      buf << text
      buf << "\e[0m"
      buf
    end

    def bold(text)
      "\e[1m#{text}\e[0m"
    end

    def dump_disasm?
      C.rjit_opts.dump_disasm
    end
  end
end