JPS63201721A - Program linking system - Google Patents

Abstract

PURPOSE:To collect a rewritable page, and to reduce the capacity of a backing store file separating a rewritable segment group and an unrewritable segment group at the time of link processing, and allocating an address. CONSTITUTION:A linker 1 consists of a segment input means 11 for inputting a segment in an object module, and a segment attribute discriminating means 12 for discriminating the attribute of an inputted segment. Moreover, said linker consists of a segment attribute managing means 13 for classifying the inputted segment by the attribute and managing it, a segment arranging means 14 for allocating a virtual address to the segment which is classified at every attribute, and a page generating means 15 for generating a page from the virtual address. A loader 3 contains a BS generating means 31 for shifting a rewritable page of a page of a load module to a backing store file BS 8, and constituted by being connected to a load module IM and the BS 8. In such a way, the BS 8 does not become large.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a program linking method in a computer system.

(Prior art) In the case of a virtual memory control method called the segmentation baging method, processing such as address allocation is performed in logical units called segments, and correspondence with real memory is performed in fixed-size units called pages. .

When a page on a load module is linked, it is converted from an object module to a load module, and when executed, it is moved to a file called a packing store file, from which page input/output processing is executed. However, even if a page consisting only of non-rewritable segments is input from the packing store file, it will not be written back, and only the page from the load module can be input. In other words, by moving only pages containing rewritable segments to the packing store file, the capacity of the packing store file can be used effectively.

In the segmentation baging method, as shown in FIG. 2, the linker allocates addresses to segments included in input object modules in the order of input.

In Figure @2, 4 is a linker, 41 is a segment input process, 42 is a segment placement process, 43 is a page creation process, 5 is an object file, 51 is an object module, and 61 is a load module.

Conventional link processing will be explained with reference to FIG.

When the linker 4 processes the object module (OM) Sl in the object file 5, the segment input means 41 inputs the segment 5fe-
When there are no more segments to input, the page creation means 43 creates a page on the load module 52.

(Problems to be Solved by the Invention) In the conventional linking method described above, even if only pages containing rewritable segments are transferred to the packing store file, the size of each rewritable segment is small. Therefore, if each is distributed in separate pages, those pages must be moved to a packing store file, which creates the problem that the packing store file becomes extremely large compared to the size of the rewriteable segment.

An object of the present invention is to identify the attributes of segments in an input object module in link processing, manage the attributes of the identified segments, and create a page from the segments by consecutively arranging segments with the same attributes. At the same time, the above disadvantages are eliminated by creating only rewritable pages among the pages created by the above page creation process in the packing store file during execution, and the packing store file is configured to not grow large. There are K that provide linking methods.

(Means for Solving Problems) The program linking method according to the present invention includes a segment attribute identification means, a segment a property management means, a segment arrangement means, a page creation means, and a packing store file creation means. It is composed of

The segment attribute identifying means is for identifying attributes of segments within the input object module during link processing.

The segment attribute management means is for managing attributes of the identified segment.

The segment placement means is for consecutively arranging segments of the same attribute.

The page creation means is for creating pages from segments.

The packing store file creation means is for creating, in a packing store file, only rewritable pages among the pages created by the page creation means at the time of execution.

(Example) Next, the configuration of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the program linking method according to the present invention. In Figure 1,
1 is the linker, 2 is the object file, 3 is the loader,
8 is a packing store file. Further, 11 is a segment input means, 12 is a segment attribute identification means, 1
3 is a segment attribute management means, 14 is a segment arrangement means, 15 is a page creation means, 21 to 2n are respectively object modules, 711d load module, 81
is a page.

Referring to FIG. 1, in an embodiment of the program linking method according to the present invention, a linker 1 includes a segment input means 11 for inputting a segment in an object module, and a segment attribute for identifying the attribute of the input segment. Identification means 12 and segment attribute management means 13 for classifying and managing input segments by attribute.
, segment arrangement means 14 for allocating virtual addresses to segments classified by attribute, and page creation means 15 for creating pages from virtual addresses. Object file 2 is an object module 21 that exists in object file 2.
(OMl--OMn), and segments S1...Sn are placed inside the object module OM1.

The loader 3 is connected to the load modules I, M and the packing store file BS, and includes a packing store file creation means 31 for transferring only rewriteable pages of the load module to a packing store file. There is. The load module LM is connected not only to the packing store file creation means 31 but also to the page creation means 1S.

Next, the operation of the linker 1 shown in FIG. 1 will be explained in detail.

When processing the object module OM1 in the object file 2, first the segment S1 is input by the segment input means 11. The input segment is judged by the next segment attribute identifying means 12 as to whether it is rewritable or not based on various attributes of the segment. The results of the determination as to whether the segment is writable or rewritable are classified and managed by the segment attribute management means 13 into rewritable segments and non-rewritable segments. When the processing of one segment is completed, the next segment is inputted by the segment input means 11 and the processing is repeated.

When all segments in all object modules to be input on the object file have been input, proceed to the next step. The segment placement means 14 selects segments that are classified and managed by the attribute of rewritable or non-rewritable in the segment attribute management means 13 and have the same attribute, that is, either the rewritable or non-rewritable attribute. Place only the segments at consecutive virtual addresses, and then place the remaining segments at consecutive virtual addresses. In other words, a rewritable segment and
It will be arranged separately from a non-rewritable segment. Thereafter, a page is created on the load module by the page creation means 15 from the segment to which the virtual address is assigned.

At this time, each page is provided with information as to whether it is rewritable or not.

Next, during one execution, the loader 3 uses the packing store file creation means 31 to create the load module LM.
Among the pages within the page, only those pages that include rewritable segments are determined based on information on whether the page is rewritable or not, and are moved to the packing store file to execute the program.

(Effects of the Invention) As explained above, in the present invention, rewritable pages can be grouped together by assigning addresses to rewritable segment groups and non-rewritable segment groups in link processing separately. , the effect is that the capacity of the packing store file is small.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the program linking method according to the present invention. FIG. 2 is a block diagram showing an example of link processing according to the prior art. 1.4...S/force 2.5.Fist/Object file 3...Loader 8...Packing store file 11.41...Segment input means 12...Segment attribute identification means 13... Segment attribute management means 14.42, fist/segment arrangement means 15.43...page creation means 31...packing store file creation means 51.2
1-2ne...Object module S, 81-Sn...Segment 61.71...Load module 81...Page

Claims (1)

[Claims] segment attribute identification means for identifying attributes of segments in an input object module in link processing; segment attribute management means for managing attributes of the identified segments; and segments with the same attribute for the attributes. A segment arrangement means for arranging the segments consecutively, a page creation means for creating pages from the segments, and a packing store file that stores only rewritable pages among the pages created by the page creation means at the time of execution. A program linking method characterized in that it comprises a packing store file creation means for creating a packing store file.