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    • 4. 发明授权
    • Program counter display device
    • 程序计数器显示装置
    • US5021948A
    • 1991-06-04
    • US31280
    • 1987-03-30
    • Yasuko NakayamaKazuo Aida
    • Yasuko NakayamaKazuo Aida
    • G06F11/32G06F11/36
    • G06F11/3664G06F11/3636
    • A program counter display device having a program memory which stores a source program. An interpreter reads out the source program from the program memory and executing it. A program list generator generates a program list of the program stored in the program memory, and a program flow monitor having knowledge of the program flow determines the program flow in accordance with the statement currently being executed. A control structure monitor correlates the current statement supplied from the interpreter with a program control structure, and checks the balance of the program control structure such as the existence of an end in a loop structure, the existence of a destination of a branch sentence, etc. A program counter-mark generator connected to the program flow monitor and the control structure monitor generates a program counter mark indicating the program counter function, the program flow, and the control sturcture. A display device connects to the program list generator and to the program counter mark generator and displays the program counter mark in association with the program list. The program counter mark is constituted by a box section which is displayed over the range of the program list included in the program control structure. A direction-indicating section is displayed within the box section, and indicates which statement is currently being executed, and also the direction of program flow. When the arrow of the direction-indicating section is pointing right, the arrow is pointing to the current statement; when the arrow is pointing upward or downward, the arrow is indicating the program flow.
    • 具有存储源程序的程序存储器的程序计数器显示装置。 解释器从程序存储器中读出源程序并执行它。 程序列表生成器生成存储在程序存储器中的程序的程序列表,具有程序流程知识的程序流程监视器根据当前执行的语句确定程序流程。 控制结构监视器将从解释器提供的当前语句与程序控制结构相关联,并且检查程序控制结构的平衡,例如循环结构中的结尾的存在,分支句的目的地的存在等 连接到程序流程监视器和控制结构监视器的程序计数器生成器产生指示程序计数器功能,程序流程和控制结构的程序计数器标记。 显示装置连接到程序列表发生器和程序计数器标记发生器,并与程序列表相关联地显示程序计数器标记。 程序计数器标记由在程序控制结构中包括的程序列表的范围上显示的框部分构成。 方向指示部分显示在框部分内,并指示当前正在执行的语句,以及程序流程的方向。 当方向指示部分的箭头指向右边时,箭头指向当前语句; 当箭头向上或向下指向时,箭头指示程序流。