JPH0740236B2 - Main memory contents saving method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a save control method of main memory contents when a program ends abnormally in a data processing system, and more particularly to a save control method of main memory contents of a huge program.

[Prior art]

Conventionally, a method of outputting the entire program or the entire writable portion of the program to an auxiliary storage device is generally adopted as one of the methods of saving the main storage contents when the program ends abnormally.

[Problems to be solved by the invention]

In the conventional method described above, when a program terminates abnormally in a huge program whose program space reaches several megabytes, it takes a long time to output the entire program or the entire writable part of the program to the auxiliary storage device. In addition, there is a disadvantage that the amount of information output to the auxiliary storage device becomes huge when it is output to the line printer.

[Means for solving problems]

According to the save control method of the main memory contents of the present invention, when a program is loaded, a sub program name and a space address on the main memory of the sub program, which is space information of a plurality of sub programs constituting the program, are displayed in a program management list. Program space management means to be registered, and when control is transferred from the caller subprogram to the callee subprogram, the callee subprogram name is registered in the program control transfer list, and the callee subprogram is controlled by the caller subprogram. Returns from this program control transfer list, deletes the called subprogram name from the subprogram control transfer means, and selects the subprogram registered in the program control transfer list when the program ends abnormally. And for each selected subprogram There by referring to the program management table, and a main memory save control means for outputting the contents of the main memory of these sub programs on an auxiliary storage device.

That is, according to the present invention, the contents of the main memory of a huge program composed of a plurality of subprograms are limited to the contents of the subprograms related to the abnormal termination of the program and output to the auxiliary storage device. Therefore, the evacuation time is shortened.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of a save control method of the main memory contents of the present invention, and FIG. 2 is a time chart showing an example of its operation.

The data processing device 2 includes a plurality of independent programs Mi loaded from the program file group 1 on the secondary storage device.
(I = 1,2, ..., n) exists.

Each of these programs Mi is a program that is created by the program space management means 3 when the program is loaded from the program file, and that consists of the subprogram name that constitutes each program Mi and the space address information on the main memory of the subprogram. Management table Pi (i = 1,
2, ..., n), and a subprogram caller created by the intersubprogram control transfer means 4 when each subprogram constituting the program transfers control to another subprogram or a control program such as an OS. Control transition table between subprograms consisting of information about callees Si
(I = 1,2, ..., n). Main memory saving control means 5
Is a sub-program SiPi (i) which is related at that time based on the inter-sub-program control transfer list Si managed by the sub-program control transfer means 4 when one of the above-mentioned programs, for example, the program Mi is abnormally terminated. = 1,2, ..., n)
Group, that is, a subprogram group that is sequentially called from the main subprogram SiPi according to the logic of the subprogram, and each subprogram that is taken out
The space address of the subprogram SiPj is referred to from the program management list Pi managed by the program space management means 3 for each SiPi, and the contents of the main memory are output to the auxiliary storage device 6.

The inter-sub-program control transfer means 4 adds the sub-program Si to the inter-sub-program control transfer list Si when one sub-program SiPj calls another sub-program SiPk.
When Pj is registered, the subprogram SiPk finishes its processing and control is returned to the calling subprogram SiPj, the subprogram control transition table Si to the subprogram SiPk
Control to remove.

In this way, the control transition table Si between sub-programs stores information about the sub-program group sequentially called hierarchically from the sub-program SiP1 which first starts as the program Mi, and processes from the sub-programs hierarchically above. The inter-subprogram control transfer means 4 controls so that the information of the called subprogram from the intersubprogram control transfer list Si is canceled every time the subprogram which is called is sequentially returned.

Next, an operation example of this embodiment will be described with reference to the time chart of FIG.

The program Mi is composed of subprograms SiP1 to SiP20, and the subprograms SiP1.SiP5.SiP20.SiP11 are sequentially called from the subprogram SiP1 according to the logic of the subprograms as shown in FIG. S
An example will be described in which the iP11 is abnormally terminated during execution.

When the program Mi is executed, control is first transferred to the main subprogram SiP1 of the program Mi. At this time, the subprogram control transfer means 4 causes the subprogram
SiP1 is registered in the control transition table Si between subprograms,
After that, the control transfer between subprograms is changed from SiP1 to SiP3.
Every time control passes from SiP3 to SiP5, from SiP5 to SiP20, and from SiP20 to SiP11, information about the caller and callee of these subprograms is transferred one after another by the inter-subprogram control transfer means 4. It will be stored in the list Si.

Next, if the program abnormally ends during execution of the subprogram SiP11, the main memory save control means 5 takes out the subprogram SiP1 from the inter-subprogram control transition list Si created as described above, and then the subprogram SiP1
By referring to the program space management list Pi by name, the space address information on the main memory of SiP1 is obtained, the contents of the main memory are output to the auxiliary memory device 6, and then the subprograms SiP3, SiP5, Auxiliary storage device 6 on the main memory of SiP20, SiP11
Output to.

〔The invention's effect〕

As described above, the present invention prevents the wasteful main memory from being saved on the auxiliary storage device by introducing the concept of a subprogram group that is being executed into the conventional main storage saving technique at the time of abnormal program termination. With this, there is an effect that the saving time can be shortened and the output amount when the program information saved in the auxiliary storage device thereafter is output to the line printer paper.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the save control method of the main memory contents of the present invention, and FIG. 2 is a time chart showing an operation example of this embodiment. 1 ... Program file group on secondary storage device, 2 ... Data processing device, 8 ... Program space management means, 4 ... Sub-program control transfer means, 5 ... Main memory save control means, 6 ... Auxiliary Memory, Mi ... Program space on main memory (i = 1,2, ..., n), Pi ... Program management list (I = 1,2, ..., n), Si ... Control between sub programs Transition list (i = 1,2, ...,
n), SiPj ... Names of subprograms that make up one program (i = 1,2, ..., nj = 1,2, ..., m) SBAj ... Start address of main program in subprogram (j
= 1,2, ..., m) SBEj ...... End address in main memory of subprogram (j
= 1,2, ..., m)

Claims (1)

[Claims] 1. A program space management means for registering a subprogram name and a space address on a main memory of the subprogram, which is space information of a plurality of subprograms constituting the program, in a program management list when the program is loaded. , When control is transferred from the calling subprogram to the called subprogram, the called subprogram name is registered in the program control transfer list, and when the called subprogram returns control to the calling subprogram, this program is registered. Inter-subprogram control transfer means for deleting a callee subprogram name from the control transfer list, and a subprogram registered in the program control transfer list when the program ends abnormally, and each selected subprogram About the program Referring to table, saving control method of the memory contents, characterized in that a main memory save control means for outputting the contents of the main memory of these sub programs on an auxiliary storage device.