CN104881274A - Method for identifying useless codes - Google Patents
Method for identifying useless codes Download PDFInfo
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- CN104881274A CN104881274A CN201410072475.1A CN201410072475A CN104881274A CN 104881274 A CN104881274 A CN 104881274A CN 201410072475 A CN201410072475 A CN 201410072475A CN 104881274 A CN104881274 A CN 104881274A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 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
Abstract
The invention discloses a method for identifying useless codes. The method comprises following steps: compiling and linking a source file so as to generate an image file; compiling and linking the image file so as to generate a map file; assigning an entry function, and performing disassembling analysis on the image file so as to obtain a symbol reference tree; and searching for symbols listed in the map file from the symbol reference tree, wherein the symbols cannot found in the symbol reference tree are the useless symbols. By employing the method for identifying useless the codes, the identified useless codes can be cleaned, so that the software maintenance difficulty is reduced, the space occupied by hardware is reduced, the product cost is finally reduced, and the product competitiveness is improved.
Description
Technical field
The present invention relates to a kind of method identifying dead code.
Background technology
In software development and maintenance process, always leave some useless codes (that is, rubbish code) inadvertently, these dead codes accumulate over a long period, cumulative, take valuable ROM space and memory source.
Summary of the invention
The technical matters that the present invention need solve is to provide a kind of method identifying dead code, identifies dead code and can carry out clearing up thus reduce software maintenance difficulty and the hardware space needed for minimizing.
For solving above-mentioned technical matters, the present invention devises a kind of method identifying dead code, it is characterized in that, comprises the following steps:
Step 1: image file is generated to source file compiling, link;
Step 2: map file is generated to described image file compiling, link, or map file is generated to source file compiling, link;
Step 3: specify entrance function main, then by carrying out dis-assembling parsing to image file, obtain the symbolic reference tree of entrance function main;
Step 4: the symbol listed by map file is searched in described symbolic reference tree, search less than symbol be ignore character.
Improve further as the present invention, described image file is executable file a.out.
The invention provides a kind of method identifying dead code, identifying dead code can clear up, thus reduces software maintenance difficulty, reduces the hardware space taken, finally reduces cost of products, improves product competitiveness.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the method for identification dead code of the present invention.
Embodiment
Technical scheme of the present invention is understood better in order to make relevant technical staff in the field, below in conjunction with the accompanying drawing of embodiment of the present invention, technical scheme in embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.
The invention provides a kind of method identifying dead code, the dead code of source file (i.e. rubbish code) can be identified.Identify dead code, next step deletion can be carried out.Delete dead code, software maintenance difficulty can be reduced and reduce the hardware space taken.
As shown in Figure 1, be the embodiment that the present invention is concrete, source file comprises a lot of code, comprising dead code and useful code.
In order to identify dead code, comprise following four steps:
Step 1: first, generate image file to source file compiling, link, in the present embodiment, described image file is executable file a.out.
Step 2: more described image file a.out compiled, link generation map file.In other embodiments of the invention, can compile source file, link generation map file, namely map file also can be generated by source file direct compilation, link.Contain symbol and the symbol address information of all codes of source file in map file, namely include the symbol of dead code and the symbol of useful code.
Step 3: specify entrance function main, then by carrying out dis-assembling parsing to image file, obtain the symbolic reference tree of entrance function main.Specify entrance function main, namely recall the code that can call, the code that can call is useful code, thus, and the symbol of what described symbolic reference tree comprised is useful code.
Step 4: the symbol listed by map file is searched in described symbolic reference tree, search less than symbol be the symbol of dead code.As in Fig. 1, embodiment illustrates, symbol " main, test_2, test_1 " in map file can find in symbolic reference tree, for the symbol of useful code, and " test_3 " searches less than, the symbol that " test_3 " is dead code in symbolic reference tree.Thus, symbolic reference tree search less than symbol be namely considered as the symbol of dead code.
The invention provides a kind of method identifying dead code, identifying dead code can clear up, thus reduces software maintenance difficulty, reduces the hardware space taken, finally reduces cost of products, improves product competitiveness.
Below only have expressed one embodiment of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction 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, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (2)
1. identify a method for dead code, it is characterized in that, comprise the following steps:
Step 1: image file is generated to source file compiling, link;
Step 2: map file is generated to described image file compiling, link, or map file is generated to source file compiling, link;
Step 3: specify entrance function main, then by carrying out dis-assembling parsing to image file, obtain the symbolic reference tree of entrance function main;
Step 4: the symbol listed by map file is searched in described symbolic reference tree, search less than symbol be ignore character.
2. the method for identification dead code according to claim 1, is characterized in that, described image file is executable file a.out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN104881274A true CN104881274A (en) | 2015-09-02 |
| CN104881274B CN104881274B (en) | 2018-02-13 |
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| CN201410072475.1A Active CN104881274B (en) | 2014-02-28 | 2014-02-28 | The method for identifying dead code |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105511934A (en) * | 2015-12-08 | 2016-04-20 | 贵阳朗玛信息技术股份有限公司 | Resource processing method and device in application program development |
| CN106598828A (en) * | 2015-10-14 | 2017-04-26 | 阿里巴巴集团控股有限公司 | Method and device for determining invalid class in source code |
| CN107358099A (en) * | 2017-06-09 | 2017-11-17 | 南京邮电大学 | Useless change quantity measuring method based on LLVM intermediate representation program microtomies |
| 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 |
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| US20020170044A1 (en) * | 2001-02-23 | 2002-11-14 | Microsoft Corporation | Method and system for register allocation |
| 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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2014
- 2014-02-28 CN CN201410072475.1A patent/CN104881274B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020170044A1 (en) * | 2001-02-23 | 2002-11-14 | Microsoft Corporation | Method and system for register allocation |
| 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 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106598828A (en) * | 2015-10-14 | 2017-04-26 | 阿里巴巴集团控股有限公司 | Method and device for determining invalid class in source code |
| CN105511934A (en) * | 2015-12-08 | 2016-04-20 | 贵阳朗玛信息技术股份有限公司 | Resource processing method and device in application program development |
| 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 |
| CN107358099A (en) * | 2017-06-09 | 2017-11-17 | 南京邮电大学 | Useless change quantity measuring method based on LLVM intermediate representation program microtomies |
| 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 |
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| Publication number | Publication date |
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| CN104881274B (en) | 2018-02-13 |
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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. |