CN104881274B - The method for identifying dead code - Google Patents
The method for identifying dead code Download PDFInfo
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- CN104881274B CN104881274B CN201410072475.1A CN201410072475A CN104881274B CN 104881274 B CN104881274 B CN 104881274B CN 201410072475 A CN201410072475 A CN 201410072475A CN 104881274 B CN104881274 B CN 104881274B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000006870 function Effects 0.000 description 5
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The present invention proposes a kind of method for identifying dead code, comprises the following steps：To source file compiling, link generation image file；To image file compiling, link generation map files；Entrance function main is specified, then by carrying out dis-assembling parsing to image file, obtains entrance function main symbolic reference tree；The symbol that map files are listed is searched in the symbolic reference tree, search less than symbol be useless symbol.The present invention provides a kind of method for identifying dead code, identifies that dead code can be cleared up, so as to reduce software maintenance difficulty, reduces the hardware space of occupancy, finally reduces product cost, improves product competitiveness.
Description
Technical field
The present invention relates to a kind of method for identifying dead code.
Background technology
During software development and maintenance, always some useless codes are inadvertently left（That is, rubbish code）,
These dead codes accumulate over a long period, cumulative, take the ROM Space and memory source of preciousness.
The content of the invention
The technical problem that the present invention need to solve is to provide a kind of method for identifying dead code, identifies dead code
Cleared up so as to reduce software maintenance difficulty and reduce required hardware space.
To solve above-mentioned technical problem, the present invention devises a kind of method for identifying dead code, it is characterised in that bag
Include following steps：
Step 1：To source file compiling, link generation image file；
Step 2：To image file compiling, link generation map files, or to source file compiling, link generation map texts
Part；
Step 3：Entrance function main is specified, then by carrying out dis-assembling parsing to image file, obtains entrance function
Main symbolic reference tree；
Step 4：The symbol that map files are listed is searched in the symbolic reference tree, search less than symbol be nothing
Use symbol.
Further improved as of the invention, the image file is executable file a.out.
The present invention provides a kind of method for identifying dead code, identifies that dead code can be cleared up, so as to drop
Low software maintenance difficulty, the hardware space of occupancy is reduced, finally reduce product cost, improve product competitiveness.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the embodiment of the method for present invention identification dead code.
Embodiment
In order that relevant technical staff in the field more fully understands technical scheme, below in conjunction with of the invention real
The accompanying drawing of mode is applied, the technical scheme in embodiment of the present invention is clearly and completely described, it is clear that described reality
Apply mode only a part of embodiment of the present invention, rather than whole embodiments.
, can be by the dead code of source file the invention provides a kind of method for identifying dead code（That is rubbish code）Know
Do not come out.Identify dead code, you can carry out the deletion of next step.Dead code is deleted, software maintenance hardly possible can be reduced
Degree and the hardware space for reducing occupancy.
As shown in figure 1, it is specific embodiment of the present invention, source file includes many codes, including useless generation
Code and useful code.
In order to identify dead code, including following four step：
Step 1：First, to source file compiling, link generation image file, in the present embodiment, the image file is
Executable file a.out.
Step 2：The image file a.out is compiled again, links generation map files.In other realities of the present invention
Apply in example, source file can be compiled, link generation map files, be i.e. map files can also be generated by source file direct compilation, link.
The symbol and symbol address information of all codes of source file are contained in map files, that is, includes dead code
The symbol of symbol and useful code.
Step 3：Entrance function main is specified, then by carrying out dis-assembling parsing to image file, obtains entrance function
Main symbolic reference tree.Entrance function main is specified, that is, recalls the code that can be called, the code that can be called is useful generation
Code, thus, what the symbolic reference tree included is the symbol of useful code.
Step 4：The symbol that map files are listed is searched in the symbolic reference tree, search less than symbol be nothing
With the symbol of code.As embodiment is shown in Fig. 1, " main, test_2, test_1 " can accorded with the symbol in map files
Number quote tree in find, be useful code symbol, and " test_3 " symbolic reference tree search less than, " test_3 " be it is useless
The symbol of code.Thus, symbolic reference tree search less than symbol be to be considered as the symbol of dead code.
The present invention provides a kind of method for identifying dead code, identifies that dead code can be cleared up, so as to drop
Low software maintenance difficulty, the hardware space of occupancy is reduced, finally reduce product cost, improve product competitiveness.
Only express one embodiment of the present invention above, its describe it is more specific and in detail, but can not therefore and
It is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, do not taking off
On the premise of present inventive concept, various modifications and improvements can be made, these belong to protection scope of the present invention.Cause
This, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (1)
- A kind of 1. method for identifying dead code, it is characterised in that comprise the following steps：Step 1：To source file compiling, link generation image file, the image file is executable file a.out；Step 2：To image file compiling, link generation map files, or to source file compiling, link generation map files； The symbol and symbol address information of all codes of source file are contained in the map files；Step 3：Entrance function main is specified, then by carrying out dis-assembling parsing to image file, obtains entrance function main's Symbolic reference tree；Step 4：The symbol that map files are listed is searched in the symbolic reference tree, search less than symbol be useless symbol Number.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410072475.1A CN104881274B (en) | 2014-02-28 | 2014-02-28 | The method for identifying dead code |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410072475.1A CN104881274B (en) | 2014-02-28 | 2014-02-28 | The method for identifying dead code |
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| Publication Number | Publication Date |
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| CN104881274A CN104881274A (en) | 2015-09-02 |
| CN104881274B true CN104881274B (en) | 2018-02-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106598828B (en) * | 2015-10-14 | 2018-11-30 | 阿里巴巴集团控股有限公司 | A kind of invalid class in source code determines method and device |
| CN105511934B (en) * | 2015-12-08 | 2018-11-13 | 贵阳朗玛信息技术股份有限公司 | Method for processing resource in application development and device |
| CN107358099B (en) * | 2017-06-09 | 2020-05-05 | 南京邮电大学 | Useless variable detection method based on LLVM intermediate representation program slicing technology |
| CN110389764A (en) * | 2019-06-19 | 2019-10-29 | 平安普惠企业管理有限公司 | Dead code method for cleaning, equipment, storage medium and device |
| CN110879709A (en) * | 2019-11-29 | 2020-03-13 | 五八有限公司 | Detection method and device of useless codes, terminal equipment and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2090983A1 (en) * | 2008-02-15 | 2009-08-19 | Siemens Aktiengesellschaft | Determining an architecture for executing code in a multi architecture environment |
| CN103049304A (en) * | 2013-01-21 | 2013-04-17 | 中国人民解放军国防科学技术大学 | Method for accelerating operating speed of graphics processing unit (GPU) through dead code removal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6925639B2 (en) * | 2001-02-23 | 2005-08-02 | Microsoft Corporation | Method and system for register allocation |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2090983A1 (en) * | 2008-02-15 | 2009-08-19 | Siemens Aktiengesellschaft | Determining an architecture for executing code in a multi architecture environment |
| CN103049304A (en) * | 2013-01-21 | 2013-04-17 | 中国人民解放军国防科学技术大学 | Method for accelerating operating speed of graphics processing unit (GPU) through dead code removal |
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| CN104881274A (en) | 2015-09-02 |
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Effective date of registration: 20201113 Address after: Room 10242, No. 260, Jiangshu Road, Xixing street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Jiji Intellectual Property Operation Co.,Ltd. Address before: 201616 Shanghai city Songjiang District Guangfulin road 4855 Lane 20, No. 90 Patentee before: Phicomm (Shanghai) Co.,Ltd. |
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Application publication date: 20150902 Assignee: Hangzhou xiaobuzhixue Information Technology Co.,Ltd. Assignor: Hangzhou Jiji Intellectual Property Operation Co.,Ltd. Contract record no.: X2021330000454 Denomination of invention: Method for identifying useless code Granted publication date: 20180213 License type: Common License Record date: 20211019 |
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Application publication date: 20150902 Assignee: Hangzhou national software industry base Co.,Ltd. Assignor: Hangzhou Jiji Intellectual Property Operation Co.,Ltd. Contract record no.: X2021330000669 Denomination of invention: Method for identifying useless code Granted publication date: 20180213 License type: Common License Record date: 20211103 |
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Effective date of registration: 20230925 Address after: Room 1701-1706, Feili Center, No. 72 Daxing Street, Binhai Community, Donghai Street, Fengze District, Quanzhou City, Fujian Province, 362000 Patentee after: Yuanzhiuniverse (Fujian) Technology Group Co.,Ltd. Address before: Room 10242, No. 260, Jiangshu Road, Xixing street, Binjiang District, Hangzhou City, Zhejiang Province Patentee before: Hangzhou Jiji Intellectual Property Operation Co.,Ltd. |