JPH0644081A - System for outputting error message of compiler - Google Patents

Abstract

PURPOSE:To aid in resolving a compile error at an early stage when a program is developed. CONSTITUTION:A syntax analizing means 2 input an inputs source program which is described in a PASCAL language and analizes syntax in accordance with the syntax rule of the PASCAL language. A symbol table registering means 3 registers information of a variable name and a type name in a symbol table 8. At the time of the error which is detected by the noncoincidence, etc., of the variable name and the type name, an index registered in the symbol table 8 as the corresponding variable name and the type name, information of an error table 10, information of an error message table and information of the symbol table 8 are edited and an error message outputting means 6 outputs a result to an output list 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a related variable when an error is detected when parsing a source program written in the PASCAL language, or when an error is detected due to a mismatch between a variable name and a type name. The present invention relates to an error message output method of a compiler that enables the output of a name, a type name, and a source line together with an error message.

[0002]

2. Description of the Related Art Conventionally, when a compilation error detected as a result of compiling a source program written in the PASCAL language is output, the error line and the position of the line where the error is found are detected. The error message is output with a symbol indicating whether it is high, an error number indicating the type of error, and an error message as one unit.

[0003]

[Problems to be Solved by the Invention] However, in the past,
When a detected compilation error is output as a result of compiling a source program written in the PASCAL language, the line in which the error occurred, a symbol indicating where in the line the error was found, and the error Since the error message indicating the type and the error message is output with the error message as one unit, in order to solve one compilation error, the work of having to refer to the variable and type declaration parts occurs. There are drawbacks. Therefore, the technical problem of the present invention, in view of the above drawbacks,
At the position where a compile error is detected, if there is an error related to variable and type mismatch, etc., the variable name, type name and its source line can be displayed together with the error message. Therefore, provide an error message output method of the compiler. Is.

[0004]

According to the present invention, a PAS
In the error message output method output at the time of compiling a source program written in the CAL language, the syntax of the source program is analyzed and the PASCA is analyzed.
When the syntax rule of the L language is different, a syntax analysis unit that recognizes as a compilation error, a symbol table registration unit that registers the information analyzed by the syntax analysis unit in a symbol table, and error information related to the compilation error. The error table registering means for registering in the error table, the error message table for pre-storing the error message corresponding to the compilation error, the information registered in the symbol table, and the information registered in the error table are cited. An error message output method of a compiler is provided, which has an error message editing unit that edits an error message corresponding to a compile error from the error message table into a predetermined format.

According to the present invention, in the error message output method of the compiler, the information registered in the symbol table includes a variable name and a type name of the source program. A message output method is obtained.

According to the present invention, in the error message output method of the compiler, the error information includes the number of lines having a compile error, the column position, and the compile error number, and In the case of a compile error related to the variable name and the type name, an error message output method of the compiler is obtained which includes the index number defined in the symbol table.

That is, in the error message output method of the compiler of the present invention, the syntax analysis means for analyzing the input source program syntax and the information such as the variable name and the type name declared in the declaration section in the source program are created. Symbol table registration means, a symbol table created by the symbol table registration means, an error message table containing an error message of the compiler, an error detected by the syntax analysis means of the compiler, and a symbol table registered by the symbol table registration means Error table registration means for registering
An error table in which information is registered by the error table registration means, an error message editing means for editing the contents of the error table registered by the error table registration means, and an error message for outputting the error message edited by the error message editing means And output means.

[0008]

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

FIG. 1 is a block diagram showing an embodiment for implementing the error message output system of the compiler according to this embodiment.

In the figure, the error message output method of the compiler is as follows: input source program 1, syntax analysis means 2, symbol table registration means 3, error table registration means 4, error message editing means 5, error message output means 6, output list. 7, a symbol table 8, an error message table 9, and an error table 10.

The syntactic analysis means 2 inputs the input source program 1 described in the PASCAL language, and then PASCA
Parsing is performed according to the syntax rules of the L language. If the syntax rules are not followed, it is recognized as a compilation error, and the source line and column position of the input source program 1 in which the compilation error occurred and the number of the compilation error are output.

Further, the symbol table registration means 3 registers the variable name, the type name and the source line thereof in the symbol table 8.

In the case of an error detected due to a mismatch between the variable name and the type name, the index registered in the symbol table 8 as the information of the corresponding variable name or type name is stored in the error table 10 by the error table registration means 4.
Register with.

The error message editing means 5 refers to the error message corresponding to the information registered in the error table 10 and the compile error number from the error message table 9, and symbolizes the information corresponding to the variable name and the type name. Quoting from Table 8 and editing the results.

The edited result is output to the output list 7 by the error message output means 6.

FIG. 2 is an example 11 of an input source program.

FIG. 3 is an error message table 12 in which a compile error message output when a compile error is detected is stored.

FIG. 4 shows a symbol table 13 in which information on variable names and type names is stored.

FIG. 5 is an explanatory diagram of the internal format of the error table 10 generated as a result of registering the information generated by the syntax analysis unit 2 in the error table 10 by the error table registration unit 4.

The number of lines having a compile error, the column position, and the number of the compile error generated by the syntax analysis unit 2 are stored in the lin of the error table 14, respectively.
Register in the fields e, column, and error message No.

Further, in the case of a compile error related to the variable name and the type name, the index number of the symbol table 8 is registered in the symbol table No field of the error table 14.

FIG. 6 shows an output list output as a result of inputting the example 11 of the input source program to the syntax analysis means 2 and processing it by the error table registration means 4, the error message editing means 5 and the error message output means 6. This is Example 15.

[0023]

As described above, according to the present invention, the PA
For source programs written in SCAL language,
At the position where a compile error is detected, if the error is related to the variable name and the type name, the variable name and the type name and the information of the source line can be displayed along with the error message. There is an advantage that the source program can be easily corrected for the detected compilation error.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration diagram of the present invention.

FIG. 2 is an example of a program written in PASCAL language.

FIG. 3 is an explanatory diagram of an error message table.

FIG. 4 is an explanatory diagram of a symbol table.

FIG. 5 is an explanatory diagram of an error table.

FIG. 6 is an example of an output result output as a result of execution.

[Explanation of symbols]

 1 input source program 2 syntax analysis means 3 symbol table registration means 4 error table registration means 5 error message editing means 6 error message output means 7 output list 8 symbol table 9 error message table 10 error table 11 input source program example 12 error message Table 13 Symbol table 14 Error table 15 Example of output list

Claims (3)

[Claims] 1. An error message output method output at the time of compiling a source program written in the PASCAL language, wherein the syntax of the source program is analyzed and the PASC is used.
When the syntax rule differs from the AL language, a syntax analysis unit that recognizes as a compilation error, a symbol table registration unit that registers the information analyzed by the syntax analysis unit in a symbol table, and error information related to the compilation error. An error table registration unit that registers in an error table, an error message table that stores in advance an error message corresponding to the compilation error, a reference to information registered in the symbol table, and the information registered in the error table. An error message output method for a compiler, comprising: an error message editing unit that edits an error message corresponding to a compilation error from the error message table into a predetermined format. 2. The compiler error message output method according to claim 1, wherein the information registered in the symbol table includes a variable name and a type name of the source program. . 3. The compiler error message output method according to claim 2, wherein the error information includes the number of lines having a compile error, the column position and the compile error number, and the variable name of the source program and In the case of a compile error related to a type name, an error message output method of a compiler including an index number defined in the symbol table.