JPH02126329A - Symbol processing system for language processing program - Google Patents

Abstract

PURPOSE:To continue a source program processing with the number of many symbols without stopping a language processing program processing by extending the area to a secondary memory when the holding area of symbol information is insufficient in a main memory. CONSTITUTION:When symbol information is necessary for object code preparation, a symbol processing part 7 refers to the symbol information registered to a symbol table and prepares an object code. Namely, the symbol processing part 7 investigates whether or not the symbol information can be registered to the symbol table in a main memory. When the capacity is not present at the main memory and the symbol information cannot be registered to the symbol table, the message of the input request of a floppy disk designation for symbol table extension is outputted onto a console 9. The processing part 7 receives this, obtains the input, and then, a file for a symbol table is opened to a designated floppy disk and the symbol is registered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a symbol processing method for a language processing program running on a computer system.

[Conventional technology]

Conventionally, the symbol information of a language processing program running on a computer system was registered in the main memory of the computer system. [Problem to be Solved by the Invention] The conventional symbol processing method described above is , since the area for holding symbol information is limited in main memory,
If the number of symbols to be registered is large and the main memory has insufficient capacity to hold the symbol information, it becomes impossible to hold the symbol information, and the processing of the language processing program must be stopped. The programmer has to modify the source program again and reduce the number of symbols.
Furthermore, the number of symbols must be taken into consideration when writing the source program, which has the disadvantage of reducing program development efficiency.

[Means to solve the problem]

The symbol processing method of the present invention includes means for holding symbol information, means for determining whether or not an area for holding symbol information exists in the main memory, and an area for holding symbol information. There is a means for expanding the data into a secondary storage device.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the entire flow of the language processing program including the processing method according to the first embodiment of the present invention, and includes a source program file 1, a language processing program 2, and an input processing section 3. and a lexical analysis processing unit 4,
It has an object code generation section 5, an output processing section 6, a symbol processing section 7, an output file 8, and a console 9.

The entire flow of a language processing program including a processing method according to a first embodiment of the present invention will be explained with reference to FIG. The language processing program 2 is executed on a console 9 in the input processing section 3.
Parse the input from source program file 1
Load. The lexical analysis processing section 4 receives the source program information read by the input processing section 3, and analyzes the source program.
Analyze statements in a program. If symbol registration is required at this time, the symbol processing unit 7 registers the symbol in a symbol table in the format shown in FIG. The object code generation section 5 receives information obtained by analyzing the sentences in the source program by the lexical analysis processing section 4, and converts the sentences in the source program into object code. At this time, if symbol information is required to generate the object code, the symbol processing section 7 refers to the symbol information registered in the symbol table and generates the object code. The output processing unit 6 receives information from the object code generation unit 5 and creates an output file 8.
Output to.

Next, the processing of the symbol processing section 7 will be explained using FIG. 2. The symbol processing unit 7 determines in step A1 whether symbol information can be registered in the symbol table in the main storage device. If there is no capacity in the main memory and symbol information cannot be registered in the symbol table, a message is output on the console in step A2 requesting input of a floppy disk device designation for expanding the symbol table. In step A3, it is determined whether the input specifying the floppy disk device has been received from the console, and if the input has been obtained, the file for the symbol table is opened on the specified floppy disk in step A4, and the symbol is registered in step A5. do.

In the second embodiment of the present invention, as data from the console 9 input when starting the language processing program,
By inputting the floppy disk device specification when expanding the symbol table and passing that information to the symbol processing section 7, the symbol processing section 7 does not wait for the input of the floppy disk specification from the console 9 when expanding the symbol table. That's fine.

The processing of the symbol processing section 7 in this second embodiment will be explained using FIG. 4. In FIG. 4, the symbol processing unit 7 determines in step B1 whether symbol information can be registered in the symbol table in the main storage device. At this point, there is no capacity in the main memory, and the symbol information is stored as a symbol.
If it cannot be registered in the table, in step B2 the floppy disk device specification for symbol table expansion inputted from the console 9 when the language processing program is started is checked, and in step B3 the floppy disk device specified for symbol table expansion is open the file,
In step B4, symbols are registered.

〔Effect of the invention〕

As explained above, the present invention enables language processing programs to be processed even in source programs with a large number of symbols by expanding the area necessary to hold symbol information not only in the main memory but also in the secondary memory. It has the effect of allowing you to continue without stopping.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the entire language processing program according to the first embodiment of the present invention, Fig. 2 is a flowchart of the present processing method in the first embodiment, and Fig. 3 shows symbol information in the first embodiment. FIG. 4 is a flowchart of the present processing method in the second embodiment of the present invention, which is a diagram showing a daple that realizes the holding means. DESCRIPTION OF SYMBOLS 1... Source program file, 2... Language processing program, 3... Input processing section, 4... Lexical analysis processing section, 5... Object code generation section, 6.
... Output processing unit, 7... Symbol processing unit, 8... Output file, 9... Console, 10... Symbol name, 11... Symbol value, 12... Symbol disallowance information.

Claims (1)

[Claims] In a symbol processing method for a language processing program running on a computer system, means for holding symbol information; means for determining whether an area for holding symbol information exists in a main memory; and means for expanding an area for holding symbol information to a secondary storage device, and expands the area to the secondary storage device when the area for holding symbol information is insufficient in the main storage device. A symbol processing method for a language processing program characterized by: