JPH0264731A - Data area initializing and processing system - Google Patents

Abstract

PURPOSE:To make it unnecessary for an internal program itself to have an initial value data and to reduce a data area by providing an initialization processing part in a data processing part and loading partially only the data area again if necessary. CONSTITUTION:While a load module 51 in a data processing part 1 is executed, an internal program 61 calls another internal program 71 by a call instruction, and when a control is transferred to the program 71, a necessary processing is executed. When, for example, the contents of a data area 81 are rewritten and called again by the call instruction, the contents of the area 81 goes to ones different from tan initial value. When the program 71 is canceled by a cancel instruction after the control is returned to the program 61, the program 61 informs the initialization processing part 4 of the necessity to initialize the area 81. Thus, when the program 71 is called again, the processing part 4 loads the contents of a data area 82 having the initial value of the area 81 into the area 81 the contents of the area 81 are initialized. Thus, the area occupied by the internal program can be reduced.

Description

[Detailed description of the invention] 〔overview〕 Concerning the initialization processing method of the data area of the internal program.

The purpose is to reduce the area occupied by internal programs.

The external storage device stores load modules including a plurality of internal programs, at least one of which has a data area therein, and the load module is loaded into main memory as a load module including internal programs each having an internal data area. , in a data processing device in which the contents of the data area are changed as the load module is executed in the data processing unit, an initialization processing unit that initializes the contents of the data area is provided; The initialization processing unit is configured to load the contents of the data area of the external storage device into the data area of the main memory when initialization of the data area becomes necessary.

[Industrial Application Field] The present invention relates to a data area initialization processing method, and more particularly to a data area initialization processing method for an internal program.

In COBOL, there is a regulation that the contents of a data area included in a program must be referenced next time when a certain instruction is executed at a certain timing, and then be set to an initial value.

Note that even if the contents of the data area of the program in main memory are changed by executing the program.

Unlike normal data, it is inevitable that the data is output to the external storage device each time it is changed (the data area of the block in question on the external storage device is similarly changed).

[Prior Art] Conventionally, the process of setting the contents of a data area as an initial value (data area initialization process) has been performed using the following nine methods depending on the type of program.

(1) Initialization of data area of external program Initialization of data area of external program (one load module itself is considered as one program) was conventionally performed as shown in Figure 6. .

One external program 91 on main memory 3.

The command rCALL "A"J calls another external program called program A, which causes the external program 93 in the external storage device 2 to be loaded onto the main memory 3 and becomes an external block program 92. When control passes to external program 92, external program 92 performs the necessary processing, thereby causing one, e.g.
The contents of the data area 82 are rewritten. Therefore, once again, the command rcALL'A'' causes the external program 92 to
is called, the contents of data area 82 are not initial values.

Then, after control returns to external program 91.

Assume that the external program 91 cancels the external program 92 by the command rcANcEL"A"J. If this instruction exists, the next time the external program called program A is referenced, the contents of the data area must be the initial value, so the external program 92 is erased from the main memory 3. Ru.

Next, when the external program 91 calls an external program called program 8 again, the external program 93 in the external storage device 2 is loaded into the main memory 3 and becomes an external program 94. As a result, the contents of the data area 84 of program A are set to initial values.

(2) Initialization of the data area of an internal program The data area of an internal program (a separate program included in one load module) has conventionally been initialized as shown in FIG.

One load module 95 loaded onto the main memory 3 includes two internal programs 96 and 97 in separate units (which can be executed independently of each other).

One internal program 96, program M, has an instruction r
CALL "A" calls another internal program 97 called program A.

When control passes to internal program 97, internal program 9
7 performs the necessary processing.

For example, the contents of the data area 87 of the internal program 97 are
Can be rewritten. Therefore, once again, the command rCALL “A”
When the internal program 97 is called by ``, the contents of the data area 87 are not initial values.

Then, after control returns to internal program 96.

Assume that the internal program 96 cancels the internal program 97 by the command rCANCEL "A". When this instruction is issued, the contents of the data area 87 must be the initial value when the internal program 97, which is program A, is referenced. However, the data area 87 or the internal program 97 must be If you try to erase from the memory 3, the load module 95 will also be erased, so it cannot be erased.Therefore, for initialization, an area 88 for storing initial value data in the internal program 97 is created.
will be provided separately.

Next, when the internal program 96 calls the internal program 97 called program A again, the command rCANCEL''
I learned that there was a "A".

Initial value data is copied from area 8B to data area 87. As a result, the contents of the data area 87 are set to initial values.

[Problem to be solved by the invention]

As mentioned above, the internal program's data area is initialized in the same way as the external program.

In other words, it is not possible to initialize by deleting the (internal) program and then reloading it.
Therefore, the (internal) program needs to have initial value data within itself, and the area 88 is required.

Since an area 8B of the same size as the data area 87 is thus separately required, there is a problem in that the internal program (or load module) occupies a large area in the external storage device 2 and main memory 3.

SUMMARY OF THE INVENTION An object of the present invention is to provide an initialization processing method for a data area of an internal program that can reduce the area occupied by the internal program.

[Means to solve the problem]

FIG. 1 is a diagram illustrating the principle of the present invention and shows a data processing apparatus according to the present invention.

In FIG. 1, 1 is a data processing section, 2 is an external storage device, 3 is a main memory, 4 is an initialization processing section, 51 and 52 are load modules, 61, 62, 71 and 72 are internal programs, 81 and 82 is a data area.

The external storage device 2 stores a load module 52. The load mosier 52 is mutually independent (separate units).
Multiple (two in this case) internal programs 62 and 72
At least one internal program 72 includes a data area 82 therein.

The load module 52 is loaded from the external storage device 2 to the main memory 3 . Due to this.

A load module 51 having the same contents as the load module 52 is stored in the main memory 3 . Therefore.

The load module 51 has internal programs 62 and 72.
The internal program 71 includes the same internal programs 61 and 71, and the internal program 71 has a data area 81.

The data processing unit 1 is composed of a central processing unit (CPU) and a main memory 3, and executes processing of a load module 51 in the main memory 3.

The initialization processing unit 4 executes an internal program 71 in the main memory 3.
When it becomes necessary to initialize the data area 81, the contents of the data area 82 of the internal program 72 in the external storage device 2 are loaded into the data area 81.

[Effect]

While the load module 51 is being executed in the data processing unit 1, the internal program 61 calls another internal program 71 (program A) with the instruction rCALL "A". When control is passed to the internal program 71, the internal program 71 performs necessary processing, thereby rewriting, for example, the contents of the data area 81 of the internal program 71.

Therefore, when the internal program 71 is called again by the instruction rcALL "A'", the contents of the data area 81 are not the initial values.

Next, assume that after control returns to the internal program 61, the internal program 61 cancels the internal program 71 by using the command rcANcEL "A". If this command is issued, the internal program 7! When referenced, the contents of the data area 81 must be the initial value.

Therefore, the internal program 61 cancels the internal program 71 and requests the initialization processing unit 4 to
Notifies that 1 initialization is required.

Next, the internal program 61 again
When , the initialization processing unit 4 that received the above notification first
loads the contents of data area 82 into data area 81. As a result, the contents of the data area 81 are set to initial values.

In this way, only a necessary portion of the binary load module 52 (ie, the portion of the data area 81 that required initialization) is partially loaded again. This eliminates the need for the internal program itself to have initial M value data. Therefore.

The area occupied by internal programs can be reduced.

The internal program data area in main memory can be initialized.

〔Example〕

FIG. 2 is an explanatory diagram of the embodiment, in which 40 is an initialization flag, 41 is a flag setting section, 42 is a flag determination section,
Reference numeral 43 indicates that the partial loading processing units 85 and 86 are essential parameters.

When the internal program 61 (program M) calls another internal program 71 (program A) using the command rCANCEL "A", the flag setting unit 41 initializes the data area 81 of the canceled internal program 71. Set a flag to indicate that it is required. That is, the initialization flag 40 for the internal program 71 is set to "
Set "Initialization required".

When the internal program 61 calls another internal program 71 using the command rCALL''A''°, the flag determining unit 42 determines whether the called internal program 71 needs to be initialized. That is, the state of the initialization flag 40 for the internal program 71 is determined.

When the flag determining unit 42 determines that initialization is necessary, the partial loading processing unit 43 performs the initialization.

In response to this, the data area 81 is initialized. That is, the original load module 5 of the load module 51 being executed
2, only the data area 82 is partially loaded into the data area 81 using the essential parameter 86. 0 When the partial loading is completed, the 2 partial loading processing unit 43
sets the initialization flag 40 to “initialization not required”.

The required parameters 86 are included in the internal program 71 to be called, and include the name of the original load module (which must be the load module 52), the address and size of the data area 82 in the load module 52, and the information stored in the main memory 3. Contains the address of the data area 81 (in the load module 51) at the time of loading.

FIG. 3 is a flowchart of data area initialization processing.

■ The first CALL instruction (
When there is a CALL “A”), the internal program 71 is called and control passes to the internal program 71 (branches).
.

(2) In the population of the internal program 71, the state of the initialization flag 40 is first determined.

At this point, since the initialization flag 40 indicates that initialization is not necessary, each instruction of the internal program 71 is executed.

■ After control returns to the internal program 61, the internal program 61 issues a CANCEL command (CANCEL''A
″″), “initialization required” is set in the initialization flag 40.

■ After this, CALL again in internal program 61.
If there is an instruction, the program branches to an internal program 71.

(2) At the entrance of the internal program 71, the state of the initialization flag 40 is determined.

At this point, the initialization flag 40 has been set to "initialization required" by the previous CANCEL command, so the following processes (1) to (2) are performed.

That is, prior to execution of processing of each instruction of the internal program 71, the data area 81 is initialized; is the loader (
It is set in the partial loading processing section 43).

■ The contents of data area 82 are partially loaded into data area 81 according to mandatory parameters 86;

(2) When the partial loading is completed, the initialization flag 40 is set to "initialization not required."

After this, the initialized internal program 7 in the data area 81
The processing of each instruction of 1 is executed.

(2) Thereafter, when there is a CALL instruction in the internal program 61, the program branches to the internal program 71.

(2) At the entrance of the internal program 71, the state of the initialization flag 40 is determined.

At this point, since the initialization flag 40 is set to "initialization not required", each instruction of the internal program 71 is executed.

In order to enable the above processing, the load module 52
In the process of obtaining the target program, the following compilation process is performed when the source program is translated (compiled) to generate the target program.

Figure 4 shows an overview of coil pile processing.

In the figure, 101 is a compiler, 102 is a source program, and 103 is a target program.

The compiler 101 converts the instruction rCALL ``A'' that calls program A in the source program 102 into a ``subroutine call to the address of program A'' in the target program 103 .

Similarly, the instruction rCANCEL ``A'' is used to ``set a flag indicating that the data area needs to be initialized in program A.'' At this time, the compile process does not allow partial loading of the data area. This is not done.
After the instruction rcANcEL “A′″”, the instruction rCALL
This is because if "A" does not exist, partial loading of the data area becomes a wasteful process.

On the other hand, in the same source program 102, a program (in this case, program A) that is called from another program (in this case, program M) is made primary at the entrance of that program.

r at the entrance of program A in the source program 102
PROcEDURE DIVISIONJ is compiled by the compiler 101 as shown in FIG. That is, at this time, partial loading of the data area is performed. Also.

The data required for this purpose is as a required parameter.

It is added to the target program 103 by the compiler 101. The required parameter is 1. For example, the target program 1
03 is the load module 52 (load module name), data area 8 in the load module 52
2, including the address and size of data area 81 when loaded into main memory 3.

Incidentally, FIG. 5 shows the processing contents of the target program generated corresponding to each instruction.

The target program 103 generated as shown in FIG.
In the data processing section 1, the target program 103 actually performs the processing shown in FIG.

For example, it is combined with data in a linkage editor and made into an executable load module 52. This data is different from the data in data area 81.

Although the present invention has been described above with reference to embodiments, the present invention can be modified in various ways according to its gist.

For example, the partial loading for the initialization process of the 7'-event area 81 may be performed not at the entrance of the internal program 71, but in response to a CANCEL command in the internal program 61, that is.

Processing in Figure 3 ■ or ■ (excluding execution of each instruction process)
is made to correspond to the CANCEL command in the internal program 61. In this case.

Setting of the initialization flag 40 becomes unnecessary.

Also, by using the initialization flag 40.

The data area 81 may be initialized regardless of the presence or absence of a CANCEL command in the internal program 61. For example, at the exit of the internal program 71 (when returning control to the internal program 61), the initialization flag 40
can be flagged as "needs initialization". In this case, whenever the internal program 71 is called, its data area 81 is initialized. This is effective when initialization is required according to the language specifications, for example, when the internal program 71 has an INITIAL attribute with respect to the internal program 61.

(Effects of the Invention) As explained above, according to the present invention, in the initialization process of the data area of the internal program in COBOL,
By partially reloading only the data area as necessary, the internal program itself does not need to have initial value data, so the area occupied by the internal program can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the present invention. FIG. 2 is an explanatory diagram of the embodiment. FIG. 3 is an initialization process flow. FIG. 4 is a diagram showing a compile process. FIG. 5 shows the processing contents of the target program, and FIGS. 6 and 7 are explanatory diagrams of the prior art. 1 is a data processing unit, 2 is an external storage device, 3 is a main memory,
4 is an initialization processing section, 40 is an initialization flag 41 is a flag setting section, 42 is a flag determination section, 43 is a partial loading processing section, 51 and 52 are load modules, 61, 62 .
71 and 72 are internal programs, and 81 and 82 are data areas.

Claims (1)

[Scope of Claims] A load module (52) including a data processing unit (1) having a main memory (3) and a plurality of internal programs (72), at least one of which has a data area (82) therein; an external storage device (2) that stores a load module (52); an internal program (71) that loads the load module (52) into the main memory (3) and has a data area (81) therein; Load module (51) including
In a data processing device in which the contents of the data area (81) are changed with the execution of the load module (51) in the data processing unit (1), the contents of the data area (81) are initialized. An initialization processing unit (4) is provided to initialize the contents of the data area (81), and when it becomes necessary to initialize the contents of the data area (81), the initialization processing unit (4)
) of the data area (82) of the main memory (3).
) is loaded into the data area (81) of the data area (81).