JPH0216644A - System for preventing endless loop in microprocessor - Google Patents

Abstract

PURPOSE:To eliminate the useless cost of a microprocessor produced by wasteful CPU time by counting the number of passing times of a label pass counting field corresponding to a label name appearing in a micro-source and, when the count value exceeds a pass limit value previously set by a user, stopping the operation of an endless loop. CONSTITUTION:A microprocessor 5 prepares a micro-text train 22 by analyzing a micro-source 1 and a label pass count array 12 is constituted of an array field 30 composed of label name fields and label pass count fields 13. The processor 5 is actuated by means of the operation of a user of a macro-processing kind 3 and a macro-source analyzing section 7 detects a label 25 by analyzing the source 1. Moreover, when a text interpreting section 16 is actuated, each section is controlled and, at the same time, a text interpretation controlling section 17 measures the number of label passing times, compares the number with a pass limit value, and controls the operation of the loop by analyzing and executing each text in the macro-text train 22.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an infinite loop prevention method in a macro processor.

[Conventional technology]

A conventional macro processor that analyzes a macro source to generate a macro text string, and interprets and executes the generated macro text string does not have a built-in mechanism to prevent infinite loops.

[Problem to be solved by the invention]

As mentioned above, conventional macro processors do not have a built-in mechanism to prevent infinite loops, so if a user accidentally creates a macro source that includes an infinite loop and causes the macro processor to execute it, the operating system The disadvantage is that the macro processor continues to operate until the time allowed by the system, resulting in wasted CPU time and unnecessary costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide an infinite loop prevention method for a macro processor that prevents the macro processor from falling into an infinite loop.

[Means for Solving the Problem] In order to achieve the above object, the infinite loop prevention method in the macro processor of the present invention analyzes a macro source to generate a macro text string, and then uses the generated macro text string to generate a macro text string. A macro processor that executes interpretation analyzes a label path count array having a plurality of array fields consisting of a label name field and a label path count field, a label path limit field that holds a label path limit value, and the macro source. is provided in a macro source analysis unit that generates a macro text string by setting a label name of a label appearing in the macro source to a label name field in an array field of the label path count array;
A label processing means for generating a label path text including an index indicating the set array field at a corresponding location of the macro text string; and a text interpretation section for interpreting the macro text string; interpreting the label path text included in the macro text string and updating the value of the label path count field in the array field pointed to by the index included in this label path text; A label path that determines whether to continue the operation or to interrupt the operation by outputting the label name set in the label name field that is paired with the label pass count field that has been compared. It consists of a text interpretation means.

[Effect]

In the infinite loop prevention method in the macro processor of the present invention, the label path limit field holds a label path limit value specified from the outside, and macro source analysis generates a macro text string by analyzing the user's macro source. A label processing means provided in the section sets the label name of the label that appears in the macro source in the label name field of one array field of the label pass count array, and also sets an index indicating the array field that has undergone this setting processing. Generates the containing label path text at the corresponding location in the macro text string. At the time of subsequent interpretation and execution of the macro text string, the label path text interpretation means provided in the text interpretation section that interprets the macro text string interprets the label path text included in the macro text string by the label processing means, The operation continues by updating the value of the label pass count field in the array field indicated by the index included in this label path text, and comparing that value with the label pass limit value held in the label pass limit field, or the above comparison is performed. It is determined whether to output the label name set in the label name field that is paired with the label pass count field for which the operation was performed and to interrupt the operation.

[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, the macro processor 5 includes a macro processor control section 6.
．． Macro source analysis department? , text interpretation section 16. Label pass count array 12° Label pass count array valid entry field 11. This macro processor 5, which includes a macro text string 22, receives a macro source 1. Macro processing type 3. A label bus limit value of 4 is given. Furthermore, when the macro processor 5 falls into an infinite loop, it outputs the label 25 to the outside and stops its operation.

The macro processor control unit 6 in the macro processor 5 is
When the macro processor 5 starts up, the value of the macro processing type 3 is determined, and if the value is "0", the macro source analysis unit 7
If it is "1", the text interpretation section 16 is started.

The macro source analysis unit 7 activated by the macro processor control unit 6 controls each unit at the time of activation, and also includes a macro source analysis control unit 8 that analyzes the macro source l and outputs the corresponding macro text to the macro text string 22.
．． Label pass count array initialization text output means 24 for generating label pass count array initialization text 23 and outputting it to macro text string 22. Label pass count array valid entry field initialization means 9 for initializing the label pass count array valid end 4 field 11. It is comprised of label processing means 10 that performs processing regarding labels 2 appearing in macro source 1.

On the other hand, the text interpretation section 16 controls each section at startup, and also includes a text interpretation control section 17° macro text string 2 that interprets and executes each text in the macro text string 22.
label pass count array initialization text interpretation means 18 for initializing the label pass count array 12 according to the contents of the label pass count array initialization text 23 and the label pass count array valid entry field 11 stored in the label pass count array initialization text 23 stored in the label pass count array initialization text 23; Label path limit field 20
, a label path limit field setting means 19 for setting a label path limit value 4 inputted from the outside into a label path limit field 20, and a macro text string 2.
Interpret the label path text 14 included in step 2 and measure the number of times the label passes.

Compare with label bus limit value 4 and interrupt execution.

It is composed of a label path text interpretation means 21 that outputs a label 25 and the like.

The macro text string 22 includes, in addition to the normal macro text generated based on the macro source l, the pass count array initialization text 23. generated by the macro source analysis unit 7. Label path text 14 is included. This label path text 14 includes a label path count array index field 15.

The label pass count array 12 is an array type array composed of array fields 30 consisting of a label pass count field 13 and a label name field 26, and is arranged in order from the first array field to rlJ, rlJ,
r2J, . . . , numbers “n” are assigned.

In FIG. 1, thin arrows indicate the flow of w control, and thick arrows indicate the flow of data.

Next, the operation of this embodiment configured as described above will be explained.

When the user starts the macro processor 5 by giving the macro processing type 3 having the value rOJ, the macro processor control section 6 starts the macro source analysis control section 8 of the macro source analysis section 7 .

When the macro source analysis control unit 8 is activated, the label path count array valid entry field initialization means 99
Next, after activating the label path count array initialization text output means 24, analysis of the macro source 1 is started, and when label 2 is detected, this label 2 is passed and the label processing means 10 is activated.

The label pass count array valid entry field initializing means 9 initializes the label pass count array valid entry field 11 by placing rOJ, and the label pass count array initialization text output means 24 initializes the label pass count array valid entry field 11. The initialization text 23 is output at the beginning of the macro text string 22.

Further, the label processing means 10 activated when the label 2 is detected performs the following processing.

■Label pass count array valid entry field 1
Increase the value of 1 by 1.

■Among the plurality of array fields 30 of the label pass count array 12, the currently detected label 2 is placed in the label name field 26 of the array field 30 with the same number as the value rN of the counted up label pass count array valid entry field 11. Set the label name.

■ Generate a label path text 14 that has the value "i" of the above label path count array valid entry field 11 in the label path count array index field 15, and add this to the corresponding 8 in the macro text string 2.2.
Output immediately before or after the macro text generated based on the source sentence corresponding to the Pig label.

The above processes ① to ② are performed every time a label appears in the macro source 1. Therefore, when m labels appear in the macro source 1, the value of the label pass count array valid entry field 11 becomes rmJ, and the labels of the array field 30 from number r I J to number rmJ of the label pass count array 12 Each label name is registered in the name field 26, and the label bus text 14 is incorporated into each corresponding location of the macro text string 22.

Now, after the necessary macro text is stored in the macro text column 22, the label bus limit value 4 has the value rLTMITJ and the macro processing type 3 has the value "1".
When the macro processor 5 is activated by giving the following, the macro processor control unit 6 activates the text interpretation control unit 17 of the text interpretation unit 16.

When activated, the text interpretation control unit 17 activates the label path limit field setting means 19 and then starts interpreting the text in the macro text string 22. and,
When label pass count array initialization text 23 is detected in text interpretation, label pass count play initialization text interpretation means 18 is activated, and when label bus text 14 is detected, label path text interpretation means 21 is activated.

When activated, the label path limit field setting means 19 sets an external label path limit value 4 in the label path limit field 20.

Further, when the label pass count array initialization text interpretation means 18 is activated, it determines whether the value of the label pass count array valid entry field 11 is "0" or not, and r
If it is OJ, the process ends, but if the value rmJ is other than "0"
If so, the values of the label pass count fields 13 included in the first to mth array fields 30 of the label pass count array 12 are each initialized to "0".

After this, the text interpretation control unit 17 reads the macro text string 2.
When the label bus text 14 is detected and the label path text interpreting means 21 is started, the label path text interpreting means 21 performs the following processing. Here, the index value included in the label pass count array index field 15 of the label bus text 14 detected this time is "j", and this value "j" is stored in the label pass count field 13 of the label pass count array 12 pointed to. Assume that the current count value rcouNTjJ.

Note that the label bus limit value 4 held in the label path limit field 20 is rLIMITJ.

■Compare C0UNTj and LIMIT, C0UNTJ<
It is determined whether LIMIT is established.

■ (1) If the above conditions are met, C0UNTj is +1
Then, the processing is returned to the text interpretation control section 17.

(2) If the above conditions are not met, the index value r
The label name set in the label name field 26 of the label pass count array 12 pointed to by JJ is set to label 2.
Output as 5 and stop the operation.

The text interpretation control unit 17 to which control has been returned proceeds to interpret the next text included in the macro text string 22.
Macro processor 5 will continue its operation. However, if the above conditions are not satisfied, the label path text interpretation means 21 outputs the label 25 and stops its operation, so the macro processor 5 also stops its operation.

In this way, according to this embodiment, the macro text string 22
When the text corresponding to the label included in the macro processor 5 is repeatedly interpreted until the label path limit value 4 specified from the outside is reached, the macro processor 5 outputs the corresponding label name as the label 25 and stops the operation. do.

Generally, the user who created macro source 1 knows the approximate value of the maximum number of loops included in macro source 1, so specify a value slightly larger than that for label path limit value 4. This prevents the macro processor 5 from continuing to operate in an infinite loop.

〔Effect of the invention〕

As explained above, the infinite loop prevention method in the macro processor of the present invention sets the label name of the label included in the macro source in the label name field of the label path count array when generating a macro text string from the macro source. At the same time, the label path text is included in the macro text string at the location corresponding to the label definition position, and when the macro text string is interpreted and executed, each time the label path text is interpreted, the execution passes through the label definition position. Each time, the number of times the label is passed is measured by counting up the value of the label pass count field corresponding to the label name of that label, and the number of times this measurement is greater than or equal to the label pass limit value set by the user in advance. Therefore, even if a user accidentally creates a macro source containing an infinite loop and inputs it to the macro processor, the macro processor will not continue operating. Therefore, unnecessary cost consumption due to wasted CPU time can be eliminated.

In addition, when the operation is interrupted, the label name of the label that has passed the label path limit value or more is output, so the user can easily determine the cause of the infinite loop that exists in the macro source based on this label name. can.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, 1... Macro source 2... Label 3... Macro processing type 4... Label path limit value 5... Macro processor 6... Macro processor control unit 7... Macro source analysis Part 10...Label processing means 11...Label pass count array Valid entry field 12...Label pass count array 13...Label pass count field 14...Label pass text 15...Label pass count array Index field 16...Text interpreter 21...Label path text interpreter 22...Macro text string 23...Label pass count array initialization text 25...Label 26...Label name field 30...・Array field

Claims (1)

[Scope of Claim] A macro processor that analyzes a macro source to generate a macro text string, and interprets and executes the generated macro text string, includes a plurality of array fields each including a label name field and a label pass count field. a label path count array having a label path count array having a label path limit value, a label path limit field holding a label path limit value, and a macro source analysis unit that analyzes the macro source to generate a macro text string, label processing means for setting a label name in a label name field in an array field of the label path count array, and generating a label path text including an index indicating the array field subjected to the setting processing at a corresponding location in the macro text string; , provided in a text interpretation unit that interprets the macro text string, interprets the label path text included in the macro text string by the label processing means, and in the array field indicated by the index included in the label path text. The operation continues by updating the value of the label pass count field and comparing the value with the label pass limit value held in the label pass limit field, or the label name field that is paired with the label pass count field that performed the comparison. A method for preventing an infinite loop in a macro processor, comprising label path text interpreting means for determining whether to output a label name set to and interrupt operation.