JPH02247734A - Optimizing system for accessing input/output procedure - Google Patents

Abstract

PURPOSE:To shorten a processing execution time for transferring an argument and a processing execution time for preprocessing and post processing by reducing the number of times of accessing I/O procedure in a system for accessing the I/O procedure. CONSTITUTION:A compiler 6 is driven by external start and a program analyzing means 4 reads in a source program 1 and detects repeating structure including an I/O sentence in the program 1. The means 4 analyzes the repeating structure, extracts information relating to the repeating structure including the leading address of I/O array, the increment of subscripts in the array and the repeating frequency and transfers the extracted information to an objective program forming means 5. At the time of translating the program 1 and forming an objective program 2, the means 5 forms the program 2 based upon the information relating to the repeating structure. Namely, the objective program 2 is formed by one I/O procedure accessing frequency by using the control information, the leading address of the I/O array, the increment of subscripts and the repeating frequency to be the number of times of executing the I/O processing as an argument group 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optimization method for input/output procedure calls in a computer program.

(Prior Art) A computer program includes a process of successively inputting or outputting elements of an array. Conventionally, in such cases, a source program is created that repeatedly executes an input/output statement that calls an input/output procedure (repetition structure), and this source program is translated by a compiler to generate a target program. This target program is then executed by an executor Pi (for example, a computer).

FIG. 2 is an example of a source program that includes input/output statements in a repeating structure written in FORTRAN. This source program consists of statements 5T21 to 5
T23 constitutes a repeating structure, and statement 5T2
The input/output statement of 2 is WRITE (6, *) A
(I) rDIMENSION A(100)J of statement 5T20 by repeating J 100 times
Outputs all elements of the array defined in succession. When this program is translated by a compiler, the target program is generated.

FIG. 4 shows an example of processing when the execution means processes this objective program. In step 810, preprocessing of the Do loop corresponding to statement 5T21 is performed, and in step Sll, the input processing corresponding to statement 5T22 is performed. Call the output procedure execution means (output processing in this case) and pass the argument.

The called input/output procedure execution means executes step 320.
An argument is received in step S21, and preprocessing for input/output processing is performed in step S21. Then, in step S22, the receiver performs output processing based on the received argument, performs input/output post-processing in step 323, and returns to step Sll.

Then, in step S12, it is determined whether the repetition has ended. If not completed, the input/output procedure (ie, steps 820 to 523) is repeated. When the iteration is finished, in step 313 statement 57
The input/output procedure execution means is called every time the input/output statement (statement 5T22.corresponding to step S11) is executed, which performs the post-processing corresponding to step S11.

(Problem to be solved by the invention) As mentioned above, each time an input/output statement is repeatedly executed,
In conventional technology that calls input/output procedures, as the number of repetitions increases, ■ the processing execution time for passing arguments to the input/output procedure increases, and ■ the input/output preprocessing and postprocessing in the input/output procedure increases. This increases processing execution time. Therefore, the execution time of the entire program also increases. As described above, there are problems that need to be solved with the conventional input/output procedure calling method.

The present invention has been made in view of these circumstances, and its purpose is to shorten the processing execution time for passing arguments and the processing execution time for input/output pre-processing and post-processing. Its purpose is to provide an input/output procedure calling method.

(Means for Solving the Problem) In order to achieve the above object, the input/output procedure calling method of the present invention uses a compiler to translate a source program that calls an input/output procedure in response to an input/output statement. In a computer system that generates a program and in which an execution means executes the target program, a program analysis means detects a repeating structure including an input/output statement in the source program and extracts information regarding the repeating structure. , the compiler has object program generation means for generating a group of arguments for the input/output procedure based on the information regarding the repetition structure extracted by the program analysis means, and the compiler has an argument generated by the object program generation means. The execution means has an input/output execution means for executing the input/output procedure based on the group.

(Operation) In the input/output procedure calling method of the present invention, the program analysis means of the compiler detects a repeating structure containing input/output statements in the source program, extracts information regarding this repeating structure, and extracts information about the repeating structure from the target program. A generation means generates a group of arguments for the input/output procedure based on information regarding the repetition structure extracted by the program analysis means. Then, the input/output execution means of the execution means executes the input/output procedure based on the argument group generated by the object program generation means.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, 1 is a source program, 2 is an objective program including an argument n3 including control information, the start address of an input/output list, an increment in an array subscript, the number of repetitions, etc., and 6 is a program analysis means 4 and an objective program generator. 7 includes an input/output execution means 8, which executes the objective program 2 and executes input/output processing from the output device 9 or the input device 10; It is an execution means that performs processing.

Next, the operation of the embodiment of FIG. 1 constructed in this way will be explained. When started from the outside, the compiler 6 operates first. The program analysis means 4 of the compiler 6 reads the source program 1 and detects a repetitive structure including input/output statements in the source program 1. Then, the detected repeating structure is analyzed and information about the repeating structure is extracted (calculated), including the start address of the input/output sequence (starting address of the array), the increment of the array subscript, and the number of repetitions.
Then, it is passed to the target program generation means 5.

When generating the target program by translating the source program 1, the target program generating means 5 generates control information, the start address of the input/output sequence, the increment of the subscript, and the input/output process based on the information regarding the repetition structure. A target program 2 is generated in which the number of repetitions, which is the number of executions, is set as the argument group 3, and the number of calls to the input/output means procedure is set to 1.

Next, the operation of the execution means 7 including the input/output execution means 8 will be explained based on the case where the target program of the source program shown in FIG. 3 is executed. The execution means 7 inputs the target program 2 and executes the target program 2. Then, a repeating structure including input/output statements (statement 5T21
~ST23>, the DO small loop preprocessing corresponding to statement ST21 is performed in step 330, and the input/output execution means 8 is called in step S31, and the argument group 6 is passed.

The called input/output execution means 8 receives the argument group 3 in step S40, performs input/output preprocessing in step S41, and executes the input/output in step 342. That is, data is extracted from the address indicated by the start address of the input/output sequence and output to the output device 9. Then, in step 343, the value obtained by adding the value indicated by the increment of the subscript to the start address of the input/output list is set as the new start address of the input/output list, and the value of the number of repetitions specified in argument group 3 is set as " The value obtained by subtracting ``1'' is set as the new number of repetitions.Next, it is determined in step S44 whether the specified number of repetitions has ended, that is, whether the value of the number of repetitions is ``0''. If the value of the number of repetitions is not "0", the process returns to step 342 and the above-described process is repeated.

On the other hand, when the value of the number of repetitions is "0", step S
Input/output post-processing is performed in step 45, and the execution means 7 returns.

The execution means 7 performs DO small loop post-processing in step S32 and continues execution of the target program 2.

In this way, in this embodiment, even if the input/output statement is repeatedly executed in the source program, the input/output procedure can be called only once.

(Effects of the Invention) As explained above, according to the input/output procedure calling method of the present invention, it is possible to reduce the number of times the input/output procedure is called. 1) It is possible to shorten the execution time of input/output pre-processing and post-processing. Therefore, by adopting the input/output procedure calling method of the present invention, the execution time of the entire program can be shortened.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the embodiment of Fig. 1, Fig. 3 is a diagram showing an example of a program with a repetitive structure, and Fig. 4 is an explanatory diagram of the conventional operation. It is. 1... Source program, 2... Target program, 3
... Argument group, 4... Program analysis means, 5...
Objective program generation means, 6... compiler, 7...
- Execution means, 8... Input/output execution means, 9... Output device, 10... Input device.

Claims (1)

[Scope of Claims] In a computer system in which a source program that calls an input/output procedure corresponding to an input/output statement is translated by a compiler to generate a target program, and an execution means executes the target program, a program analysis means for detecting a repetition structure including an input/output statement in a source program and extracting information regarding the repetition structure; and executing the input/output procedure based on the information regarding the repetition structure extracted by the program analysis means. The compiler is provided with an object program generation means for generating a group of arguments for the object program, and the execution means is provided with an input/output execution means for executing the input/output procedure based on the argument group generated by the object program generation means. An optimization method for input/output procedure calls characterized by the following.