JPH05204710A - Event tracer - Google Patents

Abstract

PURPOSE:To realize an event trace function reducing influences exerted upon the performance or quality of a program itself subject to debugging. CONSTITUTION:When a user does not activates the trace function, while referring to an event processing address 201, an event processing address recognizing means 101 executes a normal processing by moving execution control to an event processing program 301. When activating the trace function, an event processing address changing means 103 saves the contents of the event processing address 201 to an event processing address 202 before change, and the execution control is moved to an event trace information output means 102 at the time point of generating an event by setting an entry address to the event trace information output means 102. After trace information is outputted, an event processing address recognizing means 104 before change moves the execution control to the contents of the event processing address 202 before change so that event trace information can be collected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program debugging method, and more particularly to its event trace function.

[0002]

2. Description of the Related Art Conventionally, an operation of a program of the entire system including an OS-like program that operates by using a function provided by the OS such as an OS system call and a program that operates in response to an external event such as an interrupt As a method for confirming the above, there has been known a method of collecting execution trace data such as a history of system call issuance and a situation of occurrence of an external event with expensive hardware such as an emulator, and analyzing based on the data. However, this method has a quantitative limitation in collecting execution trace data,
Further, since extra information is collected in the execution trace data, it is difficult to search for necessary information from the extra information. In particular, the amount of data collected was not sufficient to confirm the operation of the program of the entire system as described above, which was not efficient.

On the other hand, in order to realize the above-mentioned collection function by software, the following method is used by grasping the time when an event such as the issuance of an OS system call or an external event occurs and the time when the event occurs. ..
That is, first, at that point, a program that displays a trace message is embedded, or secondly, the debug system is used to activate the break function (set a breakpoint) at that point, and after a break at the breakpoint, By displaying information by using a debugger command, the above-mentioned collection function was realized.

However, the above method has the following problems. In the first method, it is necessary to remove the embedded program for displaying the trace message at the time when the debugging is completed, and generate the code again, so that the recheck is also required. Also, the memory capacity in the trace target program is consumed by the program for displaying the trace message. On the other hand, in order to obtain one trace information by the second method, after setting the breakpoint,
It is necessary to execute the debugger command in the sequence of resuming the execution by the execution command, stopping the execution by the breakpoint and displaying the trace information by the display command. Therefore, when it is desired to obtain the required amount of trace information from the required time, it takes a long time to reach the required time, or the debugger command is activated many times. In the second method, the processing time for collecting trace information is long, and the execution speed when the trace function is used is higher than the execution speed when the trace function is not used.

[0005]

[Problems to be solved] The problems to be solved are
In order to obtain one trace information by the first method, it is necessary to repeat a plurality of steps after setting a breakpoint, resulting in a long processing time and a large number of debugger command invocations. In the second method, the processing time is long and the execution speed is low.

[0006]

The event trace device of the present invention is a debug system having a function of tracing the event occurrence status of a program to be debugged as a debug function, and when an event occurs, an event processing address recognition means is provided. Holds an event processing address indicating the entry address of the event processing program for the event, recognizes the event processing address, transfers execution control to the event processing address, and the event processing address changing means changes the event processing address before the change. Is stored, the event processing address is changed to an entry address to the event trace information output program, and the pre-change event processing address recognition means executes the event trace information output program and then changes the event processing address. Recognizes the conserved pre-change event processing address stage, and controlling the transfer of the execution control to the pre-change event processing addresses.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an event trace device according to the present invention. In FIG. 1, 101 is an event processing address recognition means, 102 is an event information output means, 103 is an event processing address changing means, 1
Reference numeral 04 is a pre-change event processing address recognition means, 201 is an event processing address, 202 is a pre-change event processing address, and 301 is an event processing program.

In FIG. 1, the event processing recognition address recognition means 101 recognizes the event processing address 201 and transfers execution control to the event processing address 201.
The event information output means 102 outputs information that an event has occurred. Event processing address changing means 1
03 saves the contents of the event processing address 201 in the pre-change event processing address 202, and refers to the event processing address recognition means 101 to change the contents of the event processing address 201 which is the entry address to which execution control is transferred. The event processing address recognition unit 104 refers to the contents of the pre-change event processing address 202 and transfers control to the address. Event processing program 301
Is a processing program for an event.

The operation of the present invention will be described in detail below with reference to FIG. In this embodiment, when an event occurs, the occurrence of the event is collected as trace data. First, the processing when the trace function is not activated will be described. When an event occurs, the event processing address recognition means 101 refers to the event processing address 201 and transfers execution control to the event processing 301. Next, when activating the trace function,
The event processing address changing means 103 saves the contents of the event processing address 201 to the pre-change event processing address 202, and the event trace information output means 1
The entry address value of 02 is the event processing address 20
Change to the contents of 1.

When an event occurs, the event processing address recognition means 101 causes the event processing address 20
Refer to 1. Since the entry address to the event trace information output means 102 is stored in the event processing address 201, execution control is transferred to the event trace information output means 102 and the event trace information is output. Further, the pre-change event processing address recognizing means 104 transfers execution control with reference to the pre-change event processing address 202 saved by the event processing address changing means 103. Since the entry address to the event processing 301 is stored in the pre-change event processing address 202, the pre-change event processing address recognition means 1
Event processing 301 is executed by 04.

In order to prevent the trace function from being activated from being activated, the event processing address changing means 103 causes the pre-change event processing address 2 to be changed.
The contents of 02 can be achieved by setting the contents of the event processing address 201, and the trace function can be easily controlled.

[0012]

As described above, according to the present invention, it is possible to provide an event tracing function without a great influence on the performance and quality of the debug target program by a relatively simple operation. There is an advantage that the debugging efficiency of can be improved. Further, since the program to be debugged and the trace function can exist independently of each other, there is an advantage that the trace function can be easily removed without burdening the memory capacity. The event processing address recognition means 101 can be used to define the event processing address 201 so that the event processing program 301 can be present in the program to be traced. In addition, the event information output means 102,
When the pre-change event processing address recognition means 104 and the event processing address changing means 103 are used to define the pre-change event processing address 202 to realize the trace function in the debugger, the program capacity of the debug target program itself and the trace function are reduced. There is an advantage that the processing performance when not in use is small.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an event trace device according to the present invention.

[Explanation of symbols]

 101 event processing address recognition means 102 event information output means 103 event processing address changing means 104 pre-change event processing address recognition means 201 event processing address 202 pre-change event processing address 301 event processing program

Claims (3)

[Claims] 1. An event for holding an event processing address indicating an entry address of an event processing program for the event when the event occurs, recognizing the event processing address, and transferring execution control to the event processing address. A processing address recognition means, an event processing address changing means for saving the event processing address before the change and changing the event processing address to an entry address to the event trace information output program, and the event trace information output program After execution, the pre-change event processing address recognition means for recognizing the pre-change event processing address stored by the event processing address changing means, and controlling the execution control to be transferred to the pre-change event processing address, and the event Event tracing device and an event trace information output means for outputting the information when an error occurs. 2. When the event occurs, the event processing address is recognized by the event processing address recognition means, and the event trace information is recorded by the entry address of the event trace information output means stored at the event processing address. The event trace device according to claim 1, wherein the event trace device is configured to output. 3. When the trace function is not activated, the execution control is transferred from the event processing address recognition means directly to the event processing program, and when the trace function is activated, a predetermined trace function is executed. After that, the execution control is transferred to the event processing program, and the value of the pre-change event processing address is replaced with the value of the event processing address in order to shift the trace function from the activated state to the inactivated state. The event trace device according to claim 1, wherein the event trace device is configured to perform.