JPS62137640A - Interpreter execution control system - Google Patents

Abstract

PURPOSE:To save the memory capacity by placing conversion controlling information related to program unit in execution on a main memory, controlling other information by a data set, and replacing conversion controlling information on the main memory correspondingly when the execution program unit is changed. CONSTITUTION:Respective conversion controlling information 15, 16 of main and auxiliary program units A, B are placed on a main memory area 13 and the data set 14 of an external memory. The unit A is taken out successively by an interpreter 17 and converted to machine instruction string and put into execution. When a CALL statement that calls the unit B is detected, the information 15 on the area 13 is shunted to the data set 14, and information 16 of the unit B is read out from the data set 14 and placed on the area 13, and the unit B is executed by the interpreter 17.

Description

[Detailed Description of the Invention] [(Already required)] When a source program such as r'0RTRAN is executed by an interpreter, only the conversion control information for the program unit being executed is stored in the main memory, and the conversion control information for other program units is stored in the main memory. Conversion control information is managed in datasets and CAL
L.RIETUI? When the execution program unit changes due to N, the conversion control information on the main memory is replaced correspondingly to save the required storage capacity.

[Industrial application field]

The present invention provides FORTI? in an information processing device. This invention relates to an execution control method for an interpreter such as AN.

[Conventional technology]

In the 1n information processing device, when a source program written in, for example, FORTRAN is executed using an interpreter, the interpreter must place a table of variable information and procedure information necessary for conversion processing on the host y3.

By the way, a program generally consists of a main program and subprograms such as functions and subroutines.

If these individual programs are called program units, the interpreter will have conversion control information for variable information and procedure information for each program unit.

[Problem that the invention seeks to solve]

In conventional ink printer execution control, all conversion control information tables for each program unit are stored in the main memory or externally stored in 1. One of two methods was used: to store the necessary information on α and read it each time, but the former method required a considerably large capacity in the main memory, and the latter method required There was a problem in that it took a long time to output information to and from external memory, resulting in poor response.

(Means for Solving the Problem) The present invention makes it possible to reduce the area of the host 21,0 used when executing the interpreter without deteriorating the response time.

Therefore, in the present invention, when a program consisting of a plurality of program units is executed by an interpreter, only the conversion control information of one program unit being executed is always stored in the main memory, and the conversion control information of only other programs is stored. It is stored in the data center (file) of external storage, and whenever the program unit is replaced, the conversion side '41111i'
Control is performed so that the t-information is also replaced accordingly.

FIG. 1 is a conceptual diagram showing the principle of the present invention.

In the figure, 11 is a program unit A which is, for example, a main program, 12 is a program unit B which is, for example, a subroutine subprogram, 13 is a main storage area, and 14 is a data set on external storage.

15 is conversion ttIl control information into program units, 16
1 represents conversion control information of program unit B, and 17 represents an interpreter.

When the interpreter 17 is executing the program unit All, the conversion control information 15 is placed in a predetermined main storage area 13.

The interpreter 17 takes out the statements of the program unit Δ11 one after another, and converts the statements on the conversion side? Convert to a machine instruction sequence using the l[l information 15 and execute it. However, program unit B1
When a CALL statement that calls 2 is detected, as shown by Read the conversion control information 16 of the unit B12 and enter the main entry i+! Place it on area 13.

Next, the interpreter 17 executes the program unit B12, and after completion, as shown by ■, when returning to the program unit All, the interpreter 17 erases the program unit B12 from the main storage area 13.
The conversion control information 16 of the program unit All is saved to the data set 14, and the conversion control information 15 of the program unit All is saved to the main 24r.
<Restore to area 13. In this way, execution of the program unit All continues again.

[Effect]

According to the present invention, since the conversion control information placed in the main storage area is limited to information regarding the program unit being executed, the size of the main storage area can be reduced. It also saves and restores conversion control information between the main storage area and the data center.

Since it is only necessary to call and return each program at the entrance and exit of the program, the number of input/output operations can be reduced, and the decrease in processing speed can be kept relatively small.

〔Example〕

FIG. 2 shows the configuration of one embodiment of the present invention.

In the figure, 20 is a data processing device, 21 is a source program, and 22-1 to 22-3 are program units, of which 22-1 is a main program MAIN;
-2 is the sub/L/-cheer 5UB-1, 22-3 is the subroutine 5U13-2.

Also, 23 is the main 2=le a area, 24 is the data set, 2
5-1 is conversion control 1 of main program MAIN? t 9a
.

25-2 is a subroutine S [JB-1 conversion control report,
25-3 is conversion control information of subroutine 5UB-2, 2
7 is outside the inkburi, and 28 is the outgoing horn processing section.

The interpreter 27 performs the processing shown in the flow (steps ag> in FIG. 2) for each program unit constituting the source program 21.

To explain briefly.

a. Extract the statement in the program.

b. Identify whether the statement is a statement that calls an external procedure (subroutine, external function), for example, a CALL statement. In the case of an external procedure call, step f, which will be described later, is executed, and in other cases, the next step C is executed.

c, identify whether it is a 5TOP statement, and if it is a 5TOP statement, execute step g, which will be described later; otherwise, proceed to step d.
Execute the steps.

d. Identify whether it is a RETURN statement and
If there are N sentences, step f is executed; otherwise, step e is executed.

e. Convert and execute the statement. After execution, return to a.

r. In the case of an external procedure call, processing is performed to switch to the called subroutine or external function subprogram program unit (in the example of the source program 21 shown in the figure, subroutine 5 is added to the main program MAIN).
There is a CALT statement that calls UB-1 and subroutine S [JB-1 has a CALL statement that calls subroutine 5OB-2]. Also, in the case of a RETURN statement.

Performs processing to switch to the calling program unit (
In the illustrated example, subroutines 5tJ13-1 and 5U
IIETUI on B-2? There are N sentences). After switching the program unit, return to a.

g, s'rop statement is detected, the termination process is performed.

When the interpreter 27 performs the program unit switching process (step f), the input/output processing unit 28 saves the conversion control information of the current program unit in the main storage area 23 to the data set 24 according to the instruction, and then Input/output processing is performed to restore conversion control information for each program to be executed from the data set 24 to the main storage area 23.

Next, taking the source program 21 of FIG. 2 as an example, switching operations in program units will be specifically explained using FIG. 3. In addition, in Fig. 3.

"Conversion control information" is simply expressed as "information."

■ In the main program MA'IN, subroutine 5un-
This is the operation when calling t, and the main storage area has 5U
Conversion control information regarding B-1 is placed. The processing includes saving conversion control information regarding MAIN to a data set, and initial settings for executing 5UB-1.

■ is the operation when 5UB-2 is called from 5U) 3-1, and in the same way as in ■, the data set is the conversion side of 5UB-1? :III information is additionally saved.

■ is the operation when returning to 5UB-1 by the RETURN statement of 5UB-2, and the S[JB-2
The conversion control information related to 5UB-1 is saved to the data set, and instead, the conversion control information related to 5UB-1 is read from the data center to the main storage area (restored).

■ is the operation when returning to MAIN by the RETURN statement of 5UB-1, and in the same way as in ■, the conversion control information of 5UB-1 on the main storage area is saved to the data set, and 2 is returned to MAIN instead. The conversion control information is read from the data set into the main culprit ta area.

Such operations can be applied to any number of program units, and in that case there is little need to change the size of the main storage area depending on the number of program units.

Furthermore, the information saved from the to area to the data set does not have to be all information related to the program unit, and can be saved only for an area of a certain size.

As a result, only a certain size area on the main memory is shared between each program unit. Further data seso 1
Since input/output to - is limited to an area of a certain size, saving the same program unit can only be done by overwriting the area (.

Further, it is not necessary to be aware of the address constant area etc. for reading between a certain area and a data set.

(Effects of the Invention) According to the present invention, the interpreter can be executed efficiently even in a data processing device with a relatively small main memory capacity without significantly reducing the processing speed, thereby reducing costs for the user. be able to.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram for explaining the present invention in detail. FIG. 2 is a block diagram of one embodiment of the present invention, and FIG. 3 is an explanatory diagram of an example of program unit switching operation in the embodiment shown in FIG. In Figure 1, 11 nibogram position A 12; program unit B 13: main storage area 14: data set 15 conversion control information for nibogram unit A 16: conversion control information for program 11th position B tta17: ink printer

Claims (1)

[Claims] In a data processing device, when a source program including a plurality of program units (11, 12) consisting of a main program and a subprogram is converted and executed by an interpreter (17), the plurality of program units are The conversion control information (15, 16) of each of (11, 12) is managed in a data set (14), and only the conversion control information for each program being executed is stored in the main storage area (13). 1. An interpreter execution control system characterized in that when a switch is made by calling or returning, corresponding conversion control information is also switched between a main storage area (13) and a data set (14).