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运行测试台时出现奇怪的错误，我以前从未见过。我正在尝试用 4 个寄存器模拟一个 8 位计算器。该计算器有 8 位指令，用于加、减、相等分支、立即加载和打印到监视器。我已经检查以确保我没有处于任何无限循环中。我在网上进行了研究，似乎没有任何具体原因导致我出现此错误。

我对循环、内存泄漏进行了三次检查，还尝试增加堆栈帧。到目前为止都没有成功。使用命令 ghdl -a、-e 和 -r 来分析、编译和运行。

'''

architecture structural of calculator_tb is
component calculator is
  port(
    I : in std_logic_vector(7 downto 0); --instruction input
    clk : in std_logic
  );
end component calculator;


signal I : std_logic_vector(7 downto 0);
signal clk : std_logic;


begin
  calculator_0 : calculator port map(I, clk);
    process
      file instruction_file : text is in "instructions.txt"; --Instructions in text(ASCII) file.
      variable instruction_line : line;
      variable intruction_vector : bit_vector(7 downto 0);
    begin
      while (not(endfile(instruction_file))) loop --Loop to the end of the text file.
        wait for 1 ns;
        clk <= '0';
        readline(instruction_file, instruction_line); --Read in instruction line
        read(instruction_line, intruction_vector); --merge instruction to bit vector
        I <= to_stdlogicvector(intruction_vector); --Convert bit vector to std_logic_vector and pass instruction to the calculator input.

        --Create a rising edge for the clock.
        wait for 1 ns;
        clk <= '1';
      end loop;
      assert false report "end of test" severity note;
    end process;
end architecture structural;
''''
The runtime error I receive is:

无效的内存访问（悬空访问或堆栈太小）

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