JPS6252641A - Program trace device - Google Patents

Abstract

PURPOSE:To refer to trace data in a still state by providing two sets of trace data memory circuits and transferring the trace data to the other trace data memory circuit only when the state requiring trace occurs. CONSTITUTION:When the trace data is generated, a trace activating circuit 1 activates, and a trace control circuit 4 checks the contents of a trace control data memory circuit 8. When said contents show the trace validity and a transfer command, a trace validity/invalidity connection point 5 is turned ON, and the data is outputted to a trace data control circuit 2 and registered in the trace data memory circuit 3. Simultaneously counter's value in the memory circuit 8 is transferred to a counter in the circuit 4. After the transfer command is outputted, the counter's value is subtracted only when the trace is valid. When said value comes to zero, a trace data connection point 7 is turned ON, and the data similar to the memory circuit 3 is generated in a still trace data memory circuit 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a program tracing device for tracing the execution state of a computer.

[Conventional technology]

A conventional device of this type is shown in FIG. In the figure, 1 is a trace activation circuit, 2 is a trace data management circuit, and 3 is a trace data storage circuit.

Next, the operation will be explained. First, when some trace data is generated while the computer is running, the trace starting circuit 1 creates data that serves as a guide for tracing. The trace data management circuit 2 receives this data and registers it in the trace data storage circuit 3. The trace data storage circuit 3 has a queue structure, and when the stored data becomes full, old data is automatically deleted and new trace data is registered.

[Problem that the invention seeks to solve]

Conventional program trace devices are configured as described above, and their main function is to collect data when the computer executes abnormal processing and stops, so the trace activation circuit operates frequently during normal execution. There have been problems in that it is very difficult to refer to the trace data storage device because the

The present invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a program tracing device that can easily refer to trace data even when a computer is running.

[Means for solving problems]

The program tracing device according to the present invention includes two sets of trace data storage circuits, and refers to the trace data in a static state by transferring the trace data to the other trace data storage circuit only when a state to be traced occurs. This is what I made it possible to do.

[For production]

The trace data transfer timing according to the present invention is performed by a trace activation circuit, and the trace activation circuit has a flag indicating whether it is a normal trace or involves data transfer,
This flag can be changed even during computer execution to transfer trace data.

Further, by providing a counter, the timing of the trace can be known by controlling the number of transfers after the trace transfer timing.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, parts that are the same as those in FIG. 2 are designated by the same reference numerals. In FIG. It is distinctive in that it exists. The output signal of the trace control circuit 4 is output to a trace enable/disable contact 5 and a trace data transfer contact 7, and its control is determined by the contents of the trace control data storage circuit 8. Reference numeral 9 denotes a static trace data storage circuit, into which the contents of the trace data storage circuit 3 are written in response to a trace data transfer command.

10 is a trace data reference circuit.

Next, the operation will be explained. First, when trace data is generated, the computer activates the trace activation circuit 1. At this time, the trace control data storage circuit 8
Specify which of the multiple types to use. Next, the trace control circuit 4 checks the contents of the trace control data storage circuit 8 based on this type, and checks whether the trace is valid/invalid or a transfer command. Here, if the above data is invalid, the output signal of the trace starting circuit 1 is transferred to the trace valid/invalid contact 5.
is not turned on, so it is not output to the trace data management circuit 2. Next, trace control data storage circuit 8
When a transfer command is received for the contents of The value of the counter in the trace control data storage circuit 8 is transferred. The counter value is decremented only when tracing is enabled from when the transfer command is output until the stationary trace data storage device 9 is created, and when the counter value becomes zero, the trace data transfer contact 7 of the transfer command is decremented. When turned ON, the same data as in the trace data storage circuit 3 is created in the stationary trace data storage circuit 9.

In addition to this operation, a trace data reference circuit 10 is prepared and is used when changing the contents of the trace control data storage circuit 8 or referring to the stationary trace data storage circuit 9. The program trace device of the invention is mainly O8 (operation system)
It was used to trace the state transitions of multiple tasks running on the computer, but it was also used to trace the data transmission/reception history between computers, P
It can be used to trace hardware signals such as IO.

〔Effect of the invention〕

As described above, according to the present invention, when trace data is generated in a computer, the circuit is configured so that the trace data is stored in the stationary trace data storage circuit and can be referenced in the stationary state. Alternatively, even when the program is stopped, trace data can be analyzed using the same program trace device. Furthermore, since the trace counter allows checking the context of traces, it has the effect of allowing more detailed data collection.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a program tracing device showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional program tracing device. In the figure, 1 is a trace activation circuit, 2 is a trace data management circuit, 3 is a trace data storage circuit, 4 is a trace control circuit, 8 is a storage circuit for trace control data, 9 is a storage circuit for static trace data, 1
0 is a trace data reference circuit. Patent applicant: Mitsubishi Electric Corporation 1. Agent: Patent attorney 1) Hiroshi Sawa (2 others)

Claims (1)

[Claims] When trace data is generated while the computer is running, the data is transferred from the trace start circuit to the trace data management circuit.
In a program tracing device that registers data in a trace data storage circuit, when trace data is generated from the trace starting circuit, the trace data is transmitted to the trace control circuit, checked against the type command of the trace control data storage circuit, and then traced. Only when enabled, data is output to the trace data management circuit and registered in the trace data storage circuit, and the count value of the trace control data storage circuit is transferred to a counter in the trace control circuit, and the transfer command is output. counting the count value until data is created in the stationary trace data storage device, and when a predetermined value is reached, creating the same data as the trace data storage circuit in the stationary trace data storage circuit according to the transfer command; A program tracing device characterized in that the trace data reference circuit is capable of changing the contents of the trace data storage circuit and checking the contents of the static trace data storage circuit.