JP4033952B2 - Symbol name replacement device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a symbol name replacement device that replaces a C language symbol name with a C ++ language symbol name.
[0002]
BACKGROUND OF THE INVENTION
C (C language) is a language that has been developed with UNIX as a system description language, and has many operators, data types, and features that have control structures suitable for structured programming. Has been used. On the other hand, C ++ (C ++ language) is a new language obtained by improving the C language to be object-oriented, and is common to the C language in many respects but is not completely compatible. For example, although basic structures such as operators and data types are maintained, symbols after compilation (user-defined names indicating variables, constants, or functions) are different.
[0003]
Now, assuming that an integer type (int) variable a is described in the source list in C language and C ++ language,
int a (1)
(Initial value is omitted), but when this is compiled with a C compiler,
_A (2)
Then, when compiling with C ++ compiler,
_ △ _a (3)
It becomes. Here, _ (underbar) a is a symbol, and _Δ is a symbol representing an integer type (where Δ is a convenient symbol). The difference between (2) and (3) is the presence or absence of type information. Type information is one of the attributes (properties) in object orientation, and the inheritance of such attributes is a basic principle of object orientation. Therefore, the difference between (2) and (3) (the presence or absence of type information) depends solely on whether or not it is object-oriented.
[0004]
[Prior art]
When developing a system in the C ++ language, it is useless to make all the modules newly. This is because a large number of evaluated modules already created in C language already exist.
FIG. 2 is a simple example of linking a program created in C language to a program in C ++ language. In the figure, “int a” represents an integer type symbol a. In order to link this symbol, a special specification must be applied to the C ++ side. This is the notation “extern“ C ”” in the figure. If this notation is written in a C ++ language program, a large number of evaluated modules created in the C language can be used, and development efficiency can be greatly improved.
[0005]
[Problems to be solved by the invention]
However, in this conventional method, it is necessary to write a special notation on the C ++ side, which is troublesome and careless mistakes such as forgetting to enter cannot be avoided. There was a problem that reliability could not be improved.
[0006]
Therefore, the present invention aims to provide a technique that contributes to improving the reliability of the system without having to write special notation on the C ++ side.
[0007]
[Means for Solving the Problems]
The present invention is an apparatus for replacing a C language symbol name with a C ++ language symbol name, an extraction means for extracting type information from the C language symbol name, and the extracted type information as a symbol of C ++ language type information. A conversion means for converting to C ++ language, a generation means for generating a C ++ language symbol name by combining the converted C ++ language type information symbol and the C language symbol name, and the generated C ++ language symbol name Replacing means for replacing with a C language symbol name.
[0008]
In the present invention, when a C language symbol name is given, type information is extracted from the symbol name, the type information is converted into a C ++ language type information symbol, and the symbol, the C language symbol name, Are combined to generate a C ++ language symbol name, and the generated C ++ language symbol name is replaced with the C language symbol name. Therefore, since the C language symbol name is replaced with the C ++ language symbol name, the C language symbol can be linked without writing a special notation on the C ++ side, so that the reliability of the system can be improved. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of a symbol name replacement apparatus according to the present invention.
In FIG. 1, 1 is a source list written in C language, and an integer type (int) variable a is declared with an initial value 0 as an example in the list. 2 is a part of a module generated by compiling the list 1, and the C compiler 3 is described by adding an underscore (_) to the head of the symbol name (the variable a in this example) as described above. .
[0010]
Reference numeral 4 denotes a type information extracting unit (extracting unit) for extracting type information of the symbol name. This type information extraction means 4 can use, for example, a debug option of the C compiler 3. The debug option of a known C compiler (for example, fcc911: command name of the optimized C compiler for the FR family manufactured by Fujitsu Ltd.) includes a compiled symbol name (_a), an original symbol name (a ) And type information (int) and the like. Reference numeral 5 denotes a debug table including type information, which is generated by the type information extracting means 4. Note that 6 is a working register (generating means, replacing means), 7 is a conversion table (converting means), the former is a temporary work area for generating symbol names in the C ++ language, and the latter is all of the C ++ language. Is a table map of the type information and symbols corresponding to each type information.
[0011]
In such a configuration, first, the symbols in the source list 1 are compiled by the C compiler 3, and the type information (int) is extracted by the type information extraction unit 4. Then, (1) the conversion table 7 is searched using the type information in the debug table 5, and (2) a C ++ language symbol (_Vo) that matches the type information is taken out and a predetermined position (center of the working register 6) ) Is set. Next, (3) (4) after the compiled symbol name (_a) is set at the head and tail of the working register 6, (5) Module 2 is searched using the head symbol name, and the module 2 is searched. Are replaced by a concatenation of the center and trailing symbols of the working register 6 (_Vo_a).
[0012]
Therefore, according to this configuration, since the symbols (C language symbols) in the module 2 generated by the C compiler 3 are replaced with C ++ language symbols, for example, a large number of evaluated symbols made in the C language. If this apparatus is applied to a module, type information can be given to all compiled symbols, and compatibility with C ++ programs can be ensured. As a result, existing C language assets can be used effectively without applying special specifications to the C ++ language program side, and both improvement in development efficiency and improvement in reliability can be achieved.
[0013]
The symbol name replacement device of this embodiment may be a single device, or may be incorporated in a linkage editor, assembler, or C compiler. Also, since the linkage editor, assembler, C compiler, etc. are distributed in the form of a program stored in a storage medium, the symbol name replacement device of the present embodiment is a single unit or together with these programs, a floppy disk, MO It may be stored in a storage medium such as a CD-ROM, memory card, ROM chip, fixed storage device (hard disk).
[0014]
【The invention's effect】
According to the present invention, since the C language symbol name is replaced with the C ++ language symbol name, the C language symbol can be linked without writing special notation on the C ++ side, and the development efficiency and reliability of the system Can be improved together.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of an embodiment.
FIG. 2 is a conceptual diagram of a conventional example.
[Explanation of symbols]
4: Type information extraction means (extraction means)
6: Working register (generation means, replacement means)
7: Conversion table (conversion means)

Claims (2)

The first object obtained by compiling the first source code described in the C language can be linked to the second object obtained by compiling the second source code written in the C ++ language. In order to achieve the above, a symbol name replacement device that replaces a first symbol name included in the first object ,
Storage means for storing the first symbol name and the type information of the first symbol name in association with each other;
Extracting means for searching the storage means based on the first symbol name and extracting the type information from the storage means ;
Conversion means for converting the extracted the type information in a symbol indicating the type information of the C ++ language,
Generating means for generating a second symbol name by combining the symbol indicating the converted C ++ language type information and the first symbol name;
Replacing means for replacing the first symbol name with the second symbol name;
A symbol name replacement device characterized by comprising: A computer-readable recording medium recording a program for causing a computer to function as the storage means, extraction means, conversion means, generation means, and replacement means according to claim 1.

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