JPH06119263A - Processing function calling system - Google Patents

Abstract

PURPOSE:To provide the processing function calling system in which a program is short and the memory occupancy quantity is small by increasing a processing speed at the time of calling the respective determined functions (programs) in accordance with a state variation in a communication control firmware. CONSTITUTION:The system is provided with a state transition table consisting of a two-dimensional matrix in which a state value 101 and an event number 102 are matrix elements, a retrieving means for retrieving this state transition table and obtaining function pointers 103, 104 and 105, and a function calling means for calling the corresponding functions 106, 107 and 108. In the function pointer in the state transition table, the function pointer the function to be called is stored as an initialized value in advance at the time of compiling. It is unnecessary to repeat a processing of plural steps by using a switch sentence, and a function call can be executed directly by only retrieving the table, therefore, the processing speed is improved, and the program is also shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing function calling system, and more particularly to a processing function calling system in communication control firmware.

[0002]

2. Description of the Related Art Conventionally, as a method of calling a processing function (program) determined corresponding to a state change in communication control firmware, for example, a switch statement or the like is used as a means for realizing in a high-level language such as C language. It was used to determine which of the many possible states the current state might be in and make a function call based on the result.

FIG. 3 is a flow chart showing a processing procedure of a conventional processing function calling method. Step 301 is a process of determining the current state value in the communication control firmware, which is processed by a switch statement. Step 302 is a process for determining the event that has occurred, and this is also processed by the switch statement. Step 303 is processing for calling a processing function by a function call statement.

Assuming that the current state value is the A state, the route in the A state is selected by the determination of the switch statement in step 301, and then the determination by the switch statement is performed again in step 302. By this determination, it is possible to determine the route that matches the event number "0" that has occurred, and proceed to step 303 for the first time to call the function.

Considering the processing efficiency of the switch statement, s
If all the case elements can be represented by a continuous number when the elements of the case statement appearing in the watch statement are integer types, or even if they are character types and that character is replaced with a code, the switch statement is a switch statement. Although it is possible to improve the processing efficiency by creating a table (one-dimensional), if the numbers are not consecutive, the determination is repeated by the number of case elements until they match.

[0006]

In the above-mentioned conventional processing function calling method, the judgment by the switch statement must be made twice in step 301 and step 302,
The processing efficiency becomes poor. Further, in the processing of each switch statement, the number of state values and events in the communication control firmware are generally relatively large, so sw
Since there are many case elements that appear in the "itch" sentence, the processing takes time. In particular, when the determined state value or event is described near the end of the case statement, it takes a long time to move to execution of the case statement. Therefore, although measures are taken such as describing the case element that occurs relatively frequently in the beginning, if the processing speed of data communication control is important,
It is a big problem that there are many se elements and it takes time to process a switch statement.

Further, since the description of the switch statement is increased, there are disadvantages that the number of processing steps is increased, the processing time is increased, and the memory amount occupied by the program is increased.

An object of the present invention is to provide a processing function calling system which has a high processing speed, a short program, and a small memory occupation amount.

[0009]

According to a first aspect of the present invention, there is provided a processing function calling method in which a matrix element is provided with a state value indicating an execution state of a process inside the communication control firmware and an event which is a factor for starting the process inside the communication control firmware. The state transition table storing the function pointer indicating the storage location of the program to be processed in each element of the two-dimensional matrix, and the state transition table by designating the state value and the event are searched to obtain the corresponding function pointer. It comprises a searching means and a function calling means for calling a corresponding program with the acquired function pointer.

According to a second aspect of the present invention, there is provided the processing function calling system according to the first aspect.
In addition to the respective means, the setting control means for dynamically changing the function pointer set in the state transition table under a predetermined condition inside the communication control firmware is configured.

[0011]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing an example of a state transition table used in the present invention.

The state transition table shown in FIG.
A two-dimensional matrix having 01 and the event number 102 as matrix elements is configured, and each element in this two-dimensional matrix indicates a storage location of one program in a plurality of programs (functions) in the communication control firmware. Function pointers 103, 104 and 105 are stored. Function 10 corresponding to each function pointer 103, 104, 105
The programs 6, 107, and 108 describe the contents to be processed when the event occurs at the state value. Note that the function pointer of the function to be called is stored as an initial setting value in advance in the function pointer in the state transition table during compilation.

FIG. 2 is a flow chart showing the operation of one embodiment of the present invention. Step 201 is a process of extracting a function pointer from the state transition table of FIG. This process is activated when any event occurs. Step 202 is a process of calling the function indicated by the function pointer extracted from the state transition table.

Next, the characteristic operation of the present invention will be specifically described. Now, let us consider a case where the state value 101 is the A state and the event number 102 is activated by the event of “0”. As described above, step 201 is started,
With reference to the state transition table, the function pointer 103 is fetched from the in-table element having the state value 101 of state A and the event number 102 of "0".

Since the function pointer 103 obtained here indicates the storage location of the function to be processed as described above, it is possible to directly call the function 106 in step 202 by using this value. The function 106 can be easily executed.

Similarly, when the state value 101 is the B state and the event with the event number 102 of "3" occurs, the function 107 outputs the event, and the state value 101 is the F state with the event number 1
When the event in which 02 is “3” occurs, the function 108
The process of is executed.

In the above description, the function pointer is stored as the initial setting value in the state transition table, but even if the same event occurs with the same state value, a plurality of processes are selected according to the progress of the process. It may be necessary to change the processing content depending on the start condition. In such a case, in addition to setting it as an initial value in advance at compile time, the communication control firmware itself detects the condition and dynamically changes the function pointer of the state transition table at the required timing and sets it. It can be configured to start over. By doing so, it is possible to execute different processes even with the same combination of state value and event as the start conditions differ or the process progresses.

[0019]

As described above, in the processing function calling method of the present invention, the processing function indicated by the function pointer can be directly called by setting the function pointer in the state transition table. , The processing speed can be improved much more than the conventional method.

Since the number of steps of the program can be described in several lines, the execution object can be made compact and the memory occupied by the program can be reduced. There is an effect that efficient processing can be realized in the above two aspects.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a state transition table used in the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of a conventional processing function calling method.

[Explanation of symbols]

 101 status value 102 event number 103, 104, 105 function pointer 106, 107, 108 function

Claims (2)

[Claims] 1. A program to be processed is stored in each element of a two-dimensional matrix having, as matrix elements, a state value indicating an execution state of processing inside the communication control firmware and an event that is a trigger factor of processing inside the communication control firmware. A state transition table that stores a function pointer indicating the location,
A process comprising a search means for searching the state transition table by designating the state value and the event and acquiring a corresponding function pointer, and a function calling means for calling a corresponding program with the acquired function pointer. Function call method. 2. The setting control means for dynamically changing the function pointer set in the state transition table when a predetermined condition is set inside the communication control firmware. Processing function call method of.