JPS63217421A - Dynamic link system - Google Patents

Abstract

PURPOSE:To omit a complicated link job and to convert a program linked statically into a form that can be linked dynamically and replacing this dynamically linked program with another program for dynamic link. CONSTITUTION:A dynamic link system consists of a memory part 1 containing a hard disk HD, a memory part 2 containing a floppy disk FD, a memory part 3 opposite to a main memory, an input part 4, a display part 5 and a processing part 6. The part 1 stores an executing form program described in a high-class language via a compiler, etc. The part 2 stores an executing form program which is newly produced or corrected. Then, the part 3 stores a program including various types of processes and controls when it is executed. In other words, such a means is included to convert a statically linked program into a dynamically linked one. Then the result obtained through the part 6 is displayed at a display part 5 based on an instruction and data supplied from the part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dynamic link system, and particularly to a dynamic link system suitable for changing or modifying a program.

[Conventional technology]

In conventional dynamic linking, an executable program is created by instructing the program to be dynamically linked not to be statically linked. At this time, an unresolved external reference table is created in the executable program.

If an unresolved external reference is made during execution of the executable program created as described above, the dynamic linker wanders and performs external reference resolution and editing processing. Therefore, when such an executable program is executed for the second time or later, the dynamic linker will not work because the above external references have already been resolved. In other words, dynamic linking is not executed in an executable program that is in a static link state.

The above-mentioned dynamic link system has a drawback that if a subprogram name to be dynamically linked to an executable program exists in the executable program, the subprogram cannot be dynamically linked. That is, relinking must be performed in order to execute the above subprogram. Also, if the relinked subprogram must be modified during its execution, the button must be relinked.

[Problem that the invention seeks to solve]

The problem to be solved by the present invention, in other words, the purpose of the present invention is to perform dynamic linking even when the same subprogram name exists in an executable program that has already been created. It is an object of the present invention to provide a dynamic link system that avoids the drawbacks of Ilc.

[Means for solving problems]

The dynamic link system of the present invention statically links a first storage section that stores an executable program created in advance and a second storage section that stores a newly created or modified executable subprogram. Convert your program into a dynamically linkable program,
and a second means for dynamically linking the executable subprogram to the executable program, wherein the executable program stored in the first storage unit is linked by the first means. The program is changed to a dynamically linkable program, and the executable subprogram stored in the second storage section is dynamically linked to the dynamically linkable program by the second means.

〔Example〕

Hereinafter, a dynamic link system according to the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the same figure, the dynamic link system has a hard disk (HD) storage section l and a 70 disk (F) storage section.
D), a storage section 3 corresponding to a main memory, an input section 4, a display section 5, and a processing section 6.

The storage unit 1 stores executable programs created in a high-level language such as a compiler, and the storage unit 2 stores newly created or modified executable subprograms. Furthermore, the storage unit 3 stores programs including various processes and controls when they are executed. That is, it stores means for enabling statically linked programs to be dynamically linked.

Then, the processing section 6 performs processing according to instructions and data inputted from the input section 4, and displays the results on the display section 5.

FIG. 2 is a flowchart showing the operating procedure of the above dynamic link system. In the figure, step 11 starts up a system including dynamic links.

Step 12 searches for the program name read from storage unit 2 (FD), reads it, and step 13 searches for the program name read from storage unit 2 (FD).
) to search for the program name. Then, in step 14, it is determined whether or not the same program name as the program read from F and D exists in the HD. If it does not exist, the process moves to step 15, and if it exists, the process moves to step 16.

Step 15 shows the operation of executing the designated executable program.

Step 16 starts processing to change the program in the static link state to a dynamic linkable state, and in step 17 the corresponding program in the HD is made dynamic linkable. Then, the program is replaced with a program in the FD having the same name (step 18).

Step 19 executes the replaced program while dynamically linking it to the specified executable format program.

Note that the process of changing the statically linked program to a dynamically linkable state is performed by setting the external reference section created at the time of static linking to an initial state, that is, an unresolved external reference section. And what if you temporarily save the statically linked program and don't need to restore it afterwards? Divided by jtl.

Furthermore, although HD and FD are shown as storage units 1 and 2 in the above embodiments, other storage media such as magnetic tape may also be used.

〔Effect of the invention〕

As explained in detail above, according to the dynamic link system of the present invention, a statically linked program can be dynamically linked, and it can be replaced with another program and dynamically linked, so the entire executable program can be relinked. There's no need to. Therefore, when changing or modifying a part (subprogram) of a program, it can be executed without relinking the entire program, which has the effect of eliminating complicated ring work and making effective use of system resources. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an inventive dynamic link system. Figure 2 is a flow chart. 1 to 3...Storage section, 4...Input section, 5
・・・・・・Display 7～3---Ikkari Memories 4---Hitori Rikibu 6-Zujitsuji---Ichisho Mail

Claims (1)

[Claims] A statically linked program is dynamically linked to a first storage section storing an executable program created in advance and a second storage section storing a newly created or modified executable subprogram. a first means for changing the executable program into a linkable program; and a second means for dynamically linking the executable subprogram to the executable program; Dynamically changing the program into a dynamically linkable program by the first means, and dynamically linking the executable subprogram stored in the second storage unit to the dynamically linkable program by the second means. link system.