JP2002132544A - Output method for information of program variable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem, in a conventional system, that it is difficult to extract names of other variables necessary to change simultaneously to detect dropouts, to find errors and to prevent errors of variables if there are other variables necessary to change simultaneously together with changes of variable names specified by the variables that are not having nothing to do with transmitting relations, not having similar names and not existing on the same lines. SOLUTION: An output method for information of program variable comprises a means to specify the variable names of analyzing objects by inputting a source program, a means to specify a range to extract the names of other variables, a means to extract using points of the names of the objects, a means to extract other variable names used within the specified range and a means to output the extracted other variable names.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for judging a logic omission in program creation and for indicating and preventing errors, and more particularly to a system for outputting program variable information for preventing omissions and errors relating to variables.

[0002]

2. Description of the Related Art In program development, there is an increasing tendency to develop a program at a lower cost than modifying a part of an existing program to change specifications and add functions. For this reason, it has become important to understand existing programs, determine logic omissions in corrections, and point out and prevent errors.

A conventional method is disclosed in Japanese Patent Laid-Open No. 5-1199.
In Japanese Patent Publication No.8, when a program specification change or a function addition is corrected, in order to check other variables affected, a variable name used in a source program to be analyzed is specified.
This is a method of extracting another variable that has a propagation (assignment, comparison, operation) relationship of the variable.

Japanese Patent Application Laid-Open No. H11-327879 discloses a method in which a variable having a similar variable name is regarded as another related variable, or a variable existing on the same line is regarded as another related variable.

[0005]

In the conventional method, another variable having a propagation (assignment, comparison, operation) relationship of the variable with a designated variable name is extracted, or a variable having a similar variable name is related. It is possible to extract the names of other affected variables by considering other variables that are related to each other or as variables related to the same line, but it is not a variable or similar name that has no propagation relation If a variable or a variable that does not exist on the same line has another variable that needs to be changed along with the change of the specified variable name, it needs to be changed together to judge whether the variable is missing or to detect and prevent mistakes. Extraction of other variable names was difficult.

[0006]

In order to solve the above-mentioned problem, the present invention finds relevance by the frequency of a variable used before and after the use of a variable to be analyzed. For this reason,
Extract related variables without being restricted by propagation relations, etc.
It is possible to extract variables that do not have a propagation relationship but need to be changed at the same time.

According to the present invention, there is provided a means for inputting a source program to specify a variable name to be analyzed, a means for specifying a range from which other variable names are to be extracted, and a means for extracting a use location of a variable name to be analyzed. And a means for extracting a used other variable name and a means for outputting the extracted other variable name within a range in which a specified other variable name is extracted from the extracted use location.

For the extracted other variable names, the number of appearances,
By outputting information such as the appearance probability together, it is easy to confirm other related variable names.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIG.

FIG. 1 is a diagram showing a program variable information output method according to the present invention. Here, analysis target variable name specifying means 1, other variable name extraction range specifying means 2, analysis target variable name use location extraction means 3, and other variable name extraction means 4
And other variable name output means 5.

In FIG. 1, an analysis target variable name use point extracting means 3 inputs a source program 6 and converts an analysis target variable name 8 specified by the analysis target variable name specifying means 1 from the source program 6. The position of a line or statement in the function using the analysis target variable name is extracted, and a target variable name use location list 9 is generated. The other variable name extracting means 4 inputs the generated target variable name use location list 9, and the extraction range 7 specified by the other variable name extraction range designation means 2 defines the use location of the analysis target variable name as a starting point. Depending on the number of lines before and after the line to be analyzed, the number of statements before and after the statement starting from the location where the analysis target variable name is used, or the number of lines or statements in the function where the analysis target variable name is used. The other variable name is extracted and the other variable name output means 5 outputs the other variable name list 10 or displays the other variable name list 10 on the CRT 11. Based on the contents of the other variable name list 10, it is determined that the variables need to be changed at the same time.

<Embodiment 1> The source program 6 shown in FIG.
1 and the flow of processing will be described using the analysis target source program gc31 in FIG.

The analysis target variable name specifying means 1 specifies an analysis target variable name 8.

Here, the analysis target variable name 8 is x22 (42)
And

With respect to the analysis target variable name x22 (42) specified by the analysis target variable name specifying means 1, the source programs 21 and 31 are input and the positions of function lines and statements using the analysis target variable name are determined. Extract. At this time, the position of the line or statement in the function as the position for extracting the analysis target variable name is the same as the assignment statement excluding the variable or function declaration statement, or the execution line of the conditional statement, repetition statement, function call statement, etc. I do.

The extracted result is generated as a target variable name use location list. FIG. 4 shows a target variable name use point list 41 for x22 (32).

In the present embodiment, a description will be given of a case where the other variable extraction range 7 specified by the other variable name extraction range designating means 2 is the number of lines before and after the line starting from the location where the analysis target variable name is used.

The other variable extraction range 7 is designated to the other variable name extraction range designating means 2. For example, analysis target variable name x22
(42) Extraction is performed using the number of lines, and five lines before and after are specified as an extraction range.

For other variable names used in the specified range, the position of the line or statement in the function is determined by the assignment statement excluding the variable or function declaration statement, conditional statement, repetition statement, function call statement, etc. And execution.

In FIG. 5, another variable name 5 within the analysis range of the target source program when five lines before and after are specified
In FIG. 1 and FIG. 6, extraction is performed like other variable names 61 within the analysis target range of the target source program when five lines before and after are specified.

FIG. 7 shows an output example of another variable name extracted by the other variable name output means 5 based on the number of lines based on the information shown in FIGS.

<Embodiment 2> A description will be given of a case where the extraction range of the first embodiment is specified by the number of rows and the number of appearances of other extracted variables is output together.

Based on the information shown in FIGS. 5 and 6, the other variable name output means 5 calculates the number of appearances as shown in FIG. 8 and the output example of the variable name and the number of appearances, and the analysis target variable name x in the analysis target source program (both fc and gc). Is measured as in the other variable name and appearance count measurement example 81 for.

For example, looking at a as another extracted variable, in the function f () of the fc source program,
Appeared twice. gc source program function g ()
It appears 0 times in. The number of appearances of “a” in the analysis target source programs fc and gc is 2 + 2 = 2.

Based on the result, the other variable name output means 5 outputs another variable name and the number of appearances for the analysis target variable name x in the analysis target source program (both fc and gc).
Output as

<Embodiment 3> A description will be given of a case where the extraction range of the first embodiment is specified by the number of lines and the appearance probability of another extracted variable is also output.

Based on the information shown in FIGS. 5 and 6, the other variable name output means 5 calculates the appearance probability as shown in FIG. I do. The appearance probability is defined as the probability that the analysis target variable name is used simultaneously depending on whether or not the analysis target variable name appears in the analysis target source program. The appearance probability calculation formula is Σ (presence / absence of other variables (presence = 1, absence = 0) / number of appearances of analysis target variable).

For example, the number of appearances of the analysis target variable name x is
Once in the function f () of the source program fc and once in the function g () of the source program gc, the number of appearances in the analysis target source programs fc and gc is 2
Times. Looking at the extracted other variable name p, it appears once in the function f () of the source program fc and once in the function g () of the source program gc. Therefore, the appearance probability of the other variable p is Σ (1/2 + 1/2) =
1.0.

The result is output to the other variable name output means 5 as shown in FIG.
In the case of 0, the variable name and the appearance probability output example, and another variable name and the appearance probability output example 101 for the analysis target variable name x in the analysis target source program (both fc and gc) are output.

In the output example 101, the other variable names, p, q, and y of the analysis target variable name x are very different from the analysis target variable name x. It is highly relevant, and it is highly likely that it should be changed along with the change of x.

<Embodiment 4> Another embodiment in which designation by the number of lines in Embodiments 1, 2, and 3 will be described.

In this embodiment, a case will be described in which the other variable extraction range 7 specified by the other variable name extraction range designating means 2 is the number of sentences before and after the sentence starting from the use location of the analysis target variable name. .

In FIG. 1, the other variable extraction range 7 is designated to the other variable name extraction range designating means 2. For example, the analysis target variable name x21 (2) is extracted by the number of sentences, and the extraction range is
Is specified.

FIG. 11 shows another variable name 1 in the analysis target range of the target source program when five sentences before and after are specified.
In FIG. 11 and FIG. 12, other variable names 12 within the analysis target range of the target source program when five pre- and post- sentence are specified
Extract as in 1. Based on the extracted result, it is easy to output the output of the other variable name, the output of the other variable name and the number of appearances, and the output of the other variable name and the occurrence probability, similarly to the first and third embodiments.

<Embodiment 5> When the range specified by the number of lines or the number of statements exceeds the range of a function, if the range is before the call line or statement of the function calling the function, Extract the remaining lines in the specified number of ranges or other variables used in the statement before the call, and then use the remaining lines in the specified number of ranges or the statements in the statement after the call. By extracting other variables that are out of range of the function,
It can be easily implemented.

However, from the source program to be analyzed,
If the source program of the calling function is excluded, no extraction beyond the function is performed.

<Embodiment 6> Source program 6 to be input
Can be easily implemented based on the above embodiment, for example, even when the range of fc and the source program is specified.

<Embodiment 7> Further, a range of a source program to be output is specified, and other variable names extracted by the used variable names of the analysis target are output within the specified source program range. In the case, all the input source programs are analyzed, and only the other variable names extracted by the analysis target variable names used within the specified source program range are changed. Outputs the probability of occurrence. Other variable names used only outside the specified source program range will not be output.

[0039]

As described above, according to the present invention, it is possible to efficiently extract other variable names which are difficult to extract from the analysis of propagation relations and the like and need to be changed together with the change of the target variable name. , Logic omission judgment, and error can be pointed out and prevented.

[Brief description of the drawings]

FIG. 1 is a diagram of a program variable information output method according to the present invention.

FIG. 2 is a diagram showing an analysis target source program fc of the present invention.

FIG. 3 is a diagram showing an analysis target source program gc of the present invention.

FIG. 4 is a diagram showing a target variable name use location list according to the present invention;

FIG. 5 is a diagram showing other variable names within the analysis target range of the target source program when five lines before and after the present invention are specified.

FIG. 6 is a diagram showing other variable names within the analysis target range of the target source program when five lines before and after the present invention are specified.

FIG. 7 is a diagram illustrating an output example of another variable name according to the present invention.

FIG. 8 is a diagram showing an example of outputting variable names and appearance counts according to the present invention.

FIG. 9 is a diagram showing another variable name and an example of appearance probability calculation for the analysis target variable name x of the present invention.

FIG. 10 is a diagram illustrating an example of output of variable names and appearance probabilities according to the present invention.

FIG. 11 is a diagram illustrating other variable names within the analysis target range of the target source program when five sentences before and after the sentence of the present invention are specified.

FIG. 12 is a diagram showing other variable names within the analysis target range of the target source program when five sentences before and after the sentence of the present invention are specified.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Analysis target variable name designation means, 2 ... Other variable name extraction range designation means, 3 ... Analysis target variable name use location extraction means, 4 ... Other variable name extraction means, 5 ... Other variable name output means, 6 ... Source program , 7: Other variable name extraction range, 8: Analysis target variable name, 9: Target variable name use location list, 10: Other variable name list, 11: CRT, 21: Analysis target source program, 22: Analysis target variable name x , 23 ... number of lines in the function, 24
... Number of statements in function, 31 ... Source program to be analyzed, 32
... Analyzed variable name x, 33 ... Number of lines in the function, 34 ... Number of statements in the function, 41 ... List of locations where the target variable name is used, 51 ... In the analysis range of the target source program when 5 lines before and after are specified Other variable names, 61: Other variable names within the analysis target range of the target source program when five lines before and after are specified, 71: Source program to be analyzed (both fc and gc)
Output example of other variable names for the analysis target variable name x in 81, source program to be analyzed (both fc and gc)
, Other variable names and occurrence count measurement examples of the analysis target variable name x in 82, the analysis target source program (fc,
gc), an output example of another variable name and the number of appearances for the analysis target variable name x, 91 ... another variable name and an occurrence probability calculation example for the analysis target variable name x, 101 ... an analysis target source program (fc, gc In both cases), output examples of other variable names and appearance probabilities for the analysis target variable name x, 111.
Other variable names in the analysis target range of the target source program when five surrounding sentences are specified, 121... Other variable names in the analysis target range of the target source program when five surrounding sentences are specified.

Claims (8)

[Claims] A means for inputting a source program to be analyzed; a means for specifying a variable name to be analyzed in the source program; a means for extracting a use location of the specified variable name; Means for designating the range of the analysis target starting from the use location, means for extracting other variable names used in the specified analysis target range, and means for outputting the extracted other variable names. A program variable information output method, comprising: 2. The program variable information output method according to claim 1, wherein the means for designating a range of an analysis target starting from the extracted use location includes setting the analysis target range as a start point of the use location. A program variable information output method, wherein the number of lines before and after the line to be specified is specified. 3. The program variable information output method according to claim 1, wherein the means for designating a range of an analysis target starting from the extracted use location is defined as the analysis target range defined by the use location as a start point. A program variable information output method characterized by designating the number of statements before and after a statement to be executed. 4. The program variable information output method according to claim 1, wherein the means for designating a range of an analysis target starting from the extracted use location includes the analysis range within a function of the use location. And extracting by the number of lines or the number of sentences. 5. The program variable information output method according to any one of claims 1, 2, 3, or 4, wherein the program variable information output method is used within a specified analysis target range. The means for outputting another variable name extracted by the means for extracting another variable name has means for measuring the number of appearances of the variable name, and outputs the variable name and the number of appearances of the variable name. And a program variable information output method. 6. The program variable information output method according to any one of claims 1, 2, 3, or 4, wherein the program variable information output method is used in a designated analysis target range. The means for outputting another variable name extracted by the means for extracting another variable name has means for calculating the occurrence probability of the variable name, and outputs the variable name and the occurrence probability of the variable name. And a program variable information output method. 7. The program variable information output method according to claim 1, wherein the means for inputting a source program to be analyzed specifies a range of a source program to be analyzed, and a range of the source program to be specified is specified. , And a program variable information output method. 8. The program variable information output method according to any one of claims 1, 2, 3, or 4, or 5, or 6, Means for outputting the other variable names that have been output, specify the range of the output target, and within the specified source program range, output the other variable names extracted by the used variable names of the analysis target; A program variable information output method characterized by the following.