JPH08166895A - Method and device for controlling memory - Google Patents

Abstract

PURPOSE: To facilitate the discovery of the presence or absence of the forgetting of the free processing of a used transaction memory and the trace of the process leading to a problem when the forgetting is discovered by analyzing a trace result at the stage of the verification of a program operation so as to prevent a program operation from being led to a stack state by the deficiency of a free transaction memory. CONSTITUTION: This device is provided with a memory address conversion table 4 where ID and flag are imparted for every trace portion of a program to be traced and the leading address of a trace information storage area and a counter can be stored, a trace information storage area 5 for storing the ID and flag, an ID record control part 3 storing the ID and flag delivered as parameters and an ID record processing part 2 calling the record control part 3 by defining the ID and flag as the parameters.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program trace method, and more particularly to a memory management method capable of arbitrarily setting a portion to be traced and collecting and setting the set trace portions for each specific condition range. And equipment.

[0002]

2. Description of the Related Art As one of program configuration methods, when defining a processing procedure by defining a task in a certain processing range as a unit, reference or rewriting of data in one task processing or handing over to another task processing is performed. A method of using a transaction memory as a dedicated memory area when referring to or rewriting data is generally known. In this case, in order to secure the required amount of transaction memory at the beginning of the task process, "hunt process" is performed to take out one by one from the idle memory group in the free state, and when the task is completed, the transaction memory is used for other tasks. As a general rule, the "free process" is returned to the idle memory group at the end of the same tax process so that it can be reused, or in the subsequent task process.

However, when the program is created with a bug of forgetting to incorporate the free processing of the transaction memory in the process of creating the program, the transaction memory amount which should be in the free state decreases each time the corresponding task processing is started. Eventually, there will be no transaction memory that can handle hunting, and the program will be stuck.

Conventionally, the pursuit of a bug location where the memory free processing of the transaction memory is forgotten begins by checking the shortage of the number of transaction memories based on the counter value for each management type, and when the shortage is found, each management type is detected. The procedure was to find a transaction memory that does not belong to a group, investigate the memory contents, find the last task used from the result, and trace the processing procedure to find the memory-free processing forgetting point.

[0005]

As described above, in the conventional method, the labor required for tracing the cause of the problem is large, and the transaction memory area to be investigated should increase as the amount of memory used increases. However, there is a drawback in that the labor to find out the cause of the problem is further increased since the number of problems increases.

As described above, according to the present invention, when a program is created with a bug of forgetting to incorporate a free process in the program creation process, the program operation does not reach a stack state due to lack of free transaction memory. An object of the present invention is to provide a method and means for facilitating detection of whether or not free processing of a used transaction memory has been forgotten by analyzing a trace result in a verification stage, and tracing of a process leading to a problem when the processing is found.

[0007]

In order to solve the above-mentioned problems, an identifier composed of a common part having the same range classification and an individual part unique to each trace part of a program to be traced, and Beginning of range division, passing point,
A step of giving a flag for distinguishing the end, a step of executing the identifier and the flag as data by the identifier recording processing unit pre-installed in each trace location, and the identifier recording processing unit when the step is executed. , A step of calling an identifier recording management unit with the unique identifier and flag assigned to the trace location as parameters, and recording condition information in the memory address conversion table by indexing the recording condition flag for the recording condition of the identifier and flag A step of determining whether or not to record in the area, and if it is specified not to record, return to the identifier recording processing section without recording,
When it is designated to record, the identifier recording processing unit calculates the identifier storage address of the trace information storage area and stores the identifier and the flag in the storage memory.

[0008] Further, each trace portion is traced with an identifier consisting of a common part having the same range section and an individual part unique to each other, and a flag for distinguishing the head, passing point and end of the range section. A program to be stored, a recording condition flag associated with a common part of individual identifiers, a memory address conversion table capable of storing the start address and counter of the trace information storage area, and the identifier and flag are stored as trace information. If a trace information storage area is specified and the identifier and flag are called as parameters, the trace information recording condition is determined from the memory address conversion table based on the common part of the identifiers, and it is designated to record, Read the trace information storage area where the trace information is recorded, and set the parameters in the corresponding area. And an identifier record management unit for storing the identifier and the flag passed to each other, and an identifier record for calling the recording management unit with the identifier and the flag embedded at the tracing position in the program and given for each tracing position as parameters. And a processing unit.

[0009]

With the above-mentioned configuration, the transaction memory group identifiers (hereinafter referred to as "IDs") are recorded in the transaction memory group by simply looking at the recording area of the identifier (hereinafter referred to as "ID"). The presence or absence of the free process forgetting bug can be known, and the location of the free process forgetting bug part can be narrowed down to the range after each process corresponding to the ID left at the end of the ID recording area.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 are a flow chart and a block explanatory view of an embodiment using the memory management system of the present invention. This memory management device is configured to include a trace target program 1, an ID recording processing unit 2, an ID recording management unit 3, a memory address conversion table 4, and a trace information storage area 5. A portion to be traced is arbitrarily selected from the trace target program 1, and a unique ID and flag are given to each selected tracing portion. Particularly, in this example, a case of tracing the usage status of the transaction memory used in the task processing will be described.

For each trace location in the same task of the program to be traced, an ID consisting of the same common part indicating that the task divisions are the same and an individual part that is unique to each
Then, a hunt flag is given to the hunt processing unit at the beginning of the task process, a passage flag is given to the passing point, and a free flag is given to the free processing unit at the end. Further, the ID recording processing unit 2 is previously installed in each selected trace portion in the trace target program 1 with the ID and the flag as data. Further, in the memory address conversion table, when the ID recording processing unit 2 incorporated in the ID portion corresponding to the common portion of each ID is executed, a trace flag is recorded / not recorded, and a trace flag is recorded. A head address and a counter for recording the ID and the flag as trace information in the trace information storage area 5 are set and set.

When the ID recording processing unit 2 in the trace target program 1 is executed, the ID recording processing unit 2 calls the ID recording management unit 3 with the unique ID and the flag given to the trace location as parameters. The ID recording management unit 3 indexes the memory address conversion table by the common part of the IDs passed as parameters, and records the trace information storage area 5 in order to record that the trace location has been run.
It is determined whether or not the ID and flag assigned to the trace location are recorded. If it is specified not to record, the recording in the trace information storage area 5 is not performed.
The process returns to the D recording processing unit 2. When it is designated to record, the ID recording management unit 3 calculates the ID storage address of the trace information storage area 5 by referring to the address of the trace information storage area and the counter, and the above-mentioned ID and flag passed as parameters. Is stored in the storage memory, and the process returns to the ID processing unit 2. The condition for further recording is to overwrite each time and leave / all information as trace information is updated by sequentially updating the counter / leave as trace information once, but if free processing is normally performed, it is related to related tasks. Clears the trace information of, and controls the counter.

After the execution of the trace target program 1,
The trace of the program operation can be traced from the contents of the trace information storage area 5 to determine the normal / abnormal operation sequence of the hunt, passage, and free processing. It is easy to trace the sequence of program operations and find out whether or not free processing is forgotten.

[0015]

As described above, according to the present invention, it is possible to determine whether or not there is a free process forgetting bug in the transaction memory.
It can be said that by looking only at the ID recording area of each transaction memory group, it is sufficient to search for a specific condition in which the free flag and the corresponding ID are not written. Furthermore, the location of the free processing forgetting bug location can be narrowed down to the processing section corresponding to the ID left at the end of the ID recording area, and an effective bug countermeasure can be performed.

Further, by clearing the ID recording area during the memory-free processing of the transaction memory,
The check range is further narrowed to the uncleared range, and it is easy to distinguish, which improves efficiency.

Depending on the timing of the trace check, it happens that it is just before free processing,
It may be similar to the case where the memory free process is forgotten due to a bug, but this is because there is no memory free process execution record in the continuation part from the result of checking the program again and proceeding again. It can be judged as a bug case and can be resolved.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Trace target program 2 ID recording processing unit 3 ID recording management unit 4 Memory address conversion table 5l, 5n Trace information storage area 11, ID, flag addition process 12 ID recording processing unit execution process 13 ID recording management unit call process 14 Recording condition Flag index processing 15 ID, flag writing processing

Claims (2)

[Claims] 1. An identifier consisting of a common part having the same range section and an individual part unique to each area and a flag for distinguishing the beginning, passing point, and end of the range section for each trace location of the program to be traced. A step of giving, a step in which the identifier recording processing unit previously incorporated in each trace location executes the identifier and the flag as data, and when the step is executed, the identifier recording processing unit,
A step of calling an identifier recording management section using the unique identifier and flag given to the trace location as parameters, and a trace information storage area by indexing the recording condition flag in the memory address conversion table for the recording condition of the identifier and flag To determine whether or not to record, and if not to record, return to the identifier recording processing section without recording, and if to record, specify the identifier recording processing section. Calculating the identifier storage address of the trace information storage area and storing the identifier and the flag in the storage memory. 2. A trace which is provided with an identifier consisting of a common part having the same range division and an individual part which is unique to each trace location and a flag for distinguishing the start, the passing point and the end of the range division are traced. Program and recording condition flag corresponding to the common part of each identifier,
A memory address conversion table that can store the start address and counter of the trace information storage area, a trace information storage area for storing the identifier and flag as trace information, and a call using the identifier and flag as parameters. The recording condition of the trace information is judged from the memory address conversion table based on the common part of, and if it is specified to record, the trace information storage area for recording the trace information is read out and passed to the corresponding area as a parameter. An identifier recording management unit that stores the identifier and the flag, and an identifier recording processing unit that calls the recording management unit by using the identifier and the flag, which are embedded in the portion to be traced in the program to be traced and are given to each tracing position, as parameters. A memory management device comprising.