JPH01201739A - Program execution trace controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a program execution trace control device that obtains trace data to investigate the cause of an abnormality when it occurs during program execution. It is.

(Prior Art) Generally, in a computer system, each instruction of a program is decoded one by one, and processes according to these instructions are sequentially executed.

If an abnormality occurs during program execution, the program will terminate abnormally, but in this case, it is necessary to clarify the cause of the abnormal termination.

Conventionally, when a program terminates abnormally, only the information at the time of the abnormal termination and the abnormal termination code are known, making it difficult to determine the cause of the abnormal termination or its progress, and it is difficult to determine the cause of the abnormal termination or its progress. It took a lot of effort and time to find the cause, such as relying on experience or using an offline debugger.

(Problem to be Solved by the Invention) The present invention cyclically saves the execution contents of the program that ran until the program terminated abnormally as trace data, starting from the latest one. It is an object of the present invention to provide a program execution trace control device that records the progress of the program and thereby facilitates the investigation of the cause of abnormal termination.

[Structure of the invention]

(Means and Effects for Solving the Problems) The present invention provides a trace data creation device that sequentially stores the execution contents of a program specified for tracing in a main memory as trace data, and a A trace data transfer device that transfers trace data on the memory to an external storage device, and a print output device that prints out the trace data on the external storage device in response to a request from an operator, and when a program terminates abnormally, This program execution trace control device allows the cause of an abnormality to be easily determined by analyzing the printed trace data.

(Example) An embodiment of the present invention is shown in FIG.

In FIG. 1, 1 is a program execution device that controls the execution of a program and determines whether or not to trace the program by specifying a program trace designation switch a; 2 is a program execution device that controls the execution of a program specified for tracing; A trace data creation device 3 constantly monitors the operating state of the program, cyclically editing the latest trace data onto area b of the main memory;
A program abnormality detection device detects when an abnormality occurs in a program due to some reason; 4 is a trace data transfer device that transfers trace data on the main memory to an external storage device C in response to the abnormality detection signal; 5 is an external device; This is a trace data print output device that prints out trace data on a storage device C as print information e in response to an operator operation d.

Figure 2 shows an example of trace data.
A) shows the structure of the program, FIG. 2(B) shows its operation flowchart, and FIG. 2(C) shows the structure of trace data.

In FIG. 2, depending on whether the condition of step
For example, if the condition of step (3) is "compensation", then one of the processes of step (3) is performed.

The processes ①, ②, ②, and ② are performed, and trace data as shown in FIG. 2(C) is created.

The above trace data is cyclically stored in the trace data area b of the main memory in sequence from a new step.

When a program abnormality occurs, the trace data on the main memory is transferred to the external storage device C, and at the same time, the trace data on the main memory is deleted.

The trace data on the external storage device is printed out as print information e by the print output device 5 in response to an operator's print request d.

As a result, when a program terminates abnormally, the contents of the most recently executed steps can be printed out and investigated, making it easier to investigate the cause of the abnormality.

〔Effect of the invention〕

As explained above, according to the present invention, the execution contents of a program are cyclically stored in the main memory as trace data, and when the program terminates abnormally, this trace data is transferred to an external storage device and is Since it can be printed out, by analyzing this trace data, you can understand the process progress of the program when the program terminates abnormally, and the cause of the program abnormality can be easily and clearly determined. This saves time and money spent investigating the cause. It becomes possible to significantly reduce labor.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram showing one embodiment of the present invention;
Figures (A), (B), and (C) are a program configuration diagram, an operation flowchart, and an operation flowchart for explaining the present invention in detail, respectively.
and a trace data configuration diagram. 1 Program execution device 2 Trace data creation device 3 Program abnormality detection device 4 Trace data transfer device 5 Trace data print output device a Program trace designation switch b Main memory trace data area C external storage device d Operator operation e Print information agent Patent attorney Noriyuki Chika Yudo Yamashita - Figure 1 (A) (C) Figure 2

Claims (1)

[Claims] A trace data creation device that sequentially stores the execution contents of a trace-specified program on main memory as trace data, and a trace data that transfers the trace data on the main memory to an external storage device when an abnormality is detected during program execution. A program execution trace control device comprising a transfer device and a printout device for printing out trace data on the external storage device in response to a request from an operator.