Places in code with 6 or more lines that are exactly the same.
Intro
- For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
- Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
- You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.
- To learn more about duplications and techniques for eliminating duplication, Sokrates recommends the following resources:
- Avoid Repetition, MartinFlower.com (IEEE Software article)
- Refactoring duplicated code, sourcemaking.com
- Beck Design Rules, MartinFowler.com
- DRY (Don't Repeat Yourself) Principle, Wikipedia
- The Cut-and-Paste Programming Software Development Anti-Pattern, sourcemaking.com
- Code Smells / Duplicated Code, Jeff Atwood, codinghorror.com:
- "Duplicated code is the bane of software development. Stamp out duplication whenever possible. You should always be on the lookout for more subtle cases of near-duplication, too. Don't Repeat Yourself!"
- Reducing Coupling, MartinFlower.com (IEEE Software article):
- "There are several ways to describe coupling, but it boils down to this: If changing one module in a program requires changing another module, then coupling exists. ... Duplication always implies coupling, because changing one piece of duplicate code implies changing the other."
Duplication Overall
- 19% duplication:
- 156,936 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 31,276 duplicated lines
- 3,949 duplicates
Duplication per Extension
Duplication per Component (primary)
Duplication Between Components (50+ lines)
Open 3D force graph...
Show more details on duplication between components...
From Component
--> To Component
Duplicated
Lines
File Pairs
Details
cavium-octeon (1%)
--> lib (8%)
352
2 file pairs
details...
loongson2ef (3%)
--> loongson64 (2%)
100
2 file pairs
details...
cobalt (10%)
--> vr41xx (2%)
63
12 file pairs
details...
dec (1%)
--> include (<1%)
62
1 file pair
details...
sgi-ip22 (2%)
--> sni (2%)
54
1 file pair
details...
kernel (<1%)
--> math-emu (<1%)
54
1 file pair
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| cavium-octeon (1%) --> lib (8%) |
352 | 2 file pairs | details... |
| loongson2ef (3%) --> loongson64 (2%) |
100 | 2 file pairs | details... |
| cobalt (10%) --> vr41xx (2%) |
63 | 12 file pairs | details... |
| dec (1%) --> include (<1%) |
62 | 1 file pair | details... |
| sgi-ip22 (2%) --> sni (2%) |
54 | 1 file pair | details... |
| kernel (<1%) --> math-emu (<1%) |
54 | 1 file pair | details... |
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 129 | x 2 | include/asm/octeoninclude/asm/octeon | 1516:1646 (3%)2327:2457 (3%) | view | |
| 127 | x 2 | include/asm/octeoninclude/asm/octeon | 664:792 (5%)1098:1226 (5%) | view | |
| 124 | x 2 | include/asm/octeoninclude/asm/octeon | 1518:1642 (3%)1918:2042 (3%) | view | |
| 124 | x 2 | include/asm/octeoninclude/asm/octeon | 1651:1775 (3%)2049:2173 (3%) | view | |
| 124 | x 2 | include/asm/octeoninclude/asm/octeon | 1918:2042 (3%)2329:2453 (3%) | view | |
| 122 | x 2 | include/asm/octeoninclude/asm/octeon | 2460:2582 (3%)2716:2838 (3%) | view | |
| 122 | x 2 | include/asm/octeoninclude/asm/octeon | 1784:1906 (3%)2180:2302 (3%) | view | |
| 109 | x 2 | include/asm/octeoninclude/asm/octeon | 890:1000 (5%)1324:1434 (5%) | view | |
| 102 | x 2 | include/asm/octeoninclude/asm/octeon | 599:701 (9%)710:812 (9%) | view | |
| 94 | x 2 | include/asm/octeoninclude/asm/octeon | 243:337 (8%)880:974 (8%) | view | |
| 91 | x 2 | include/asm/octeoninclude/asm/octeon | 504:596 (8%)979:1071 (8%) | view | |
| 91 | x 2 | include/asm/octeoninclude/asm/octeon | 795:887 (4%)1229:1321 (4%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 408:496 (8%)717:805 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 408:496 (8%)980:1068 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 717:805 (8%)980:1068 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 408:496 (8%)883:971 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 717:805 (8%)883:971 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 1003:1092 (4%)1437:1526 (4%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 408:496 (8%)606:694 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 408:496 (8%)505:593 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 606:694 (8%)883:971 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 606:694 (8%)980:1068 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 505:593 (8%)717:805 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 505:593 (8%)606:694 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 505:593 (8%)883:971 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 883:971 (8%)980:1068 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 246:334 (8%)717:805 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 246:334 (8%)980:1068 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 246:334 (8%)408:496 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 246:334 (8%)606:694 (8%) | view | |
| 88 | x 2 | include/asm/octeoninclude/asm/octeon | 246:334 (8%)505:593 (8%) | view | |
| 84 | x 2 | include/asm/octeoninclude/asm/octeon | 685:769 (3%)1004:1088 (3%) | view | |
| 84 | x 2 | include/asm/octeoninclude/asm/octeon | 685:769 (3%)1438:1522 (3%) | view | |
| 84 | x 2 | include/asm/octeoninclude/asm/octeon | 1004:1088 (3%)1119:1203 (3%) | view | |
| 84 | x 2 | include/asm/octeoninclude/asm/octeon | 1119:1203 (3%)1438:1522 (3%) | view | |
| 74 | x 2 | include/asm/octeoninclude/asm/octeon | 1634:1708 (3%)1800:1874 (3%) | view | |
| 72 | x 2 | include/asm/octeoninclude/asm/octeon | 288:360 (2%)509:581 (2%) | view | |
| 71 | x 2 | include/asm/octeoninclude/asm/octeon | 1369:1441 (4%)1586:1658 (4%) | view | |
| 68 | x 2 | include/asm/octeoninclude/asm/octeon | 1511:1580 (4%)1728:1797 (4%) | view | |
| 66 | x 2 | include/asm/octeoninclude/asm/octeon | 326:393 (13%)300:367 (14%) | view | |
| 66 | x 2 | include/asm/octeoninclude/asm/octeon | 326:393 (13%)373:440 (14%) | view | |
| 66 | x 2 | include/asm/octeoninclude/asm/octeon | 300:367 (14%)373:440 (14%) | view | |
| 66 | x 2 | include/asm/octeoninclude/asm/octeon | 253:320 (13%)326:393 (13%) | view | |
| 66 | x 2 | include/asm/octeoninclude/asm/octeon | 253:320 (13%)300:367 (14%) | view | |
| 66 | x 2 | include/asm/octeoninclude/asm/octeon | 253:320 (13%)373:440 (14%) | view | |
| 63 | x 2 | include/asm/octeoninclude/asm/octeon | 1444:1508 (3%)1661:1725 (3%) | view | |
| 61 | x 2 | include/asm/octeoninclude/asm/octeon | 812:874 (3%)1193:1255 (3%) | view | |
| 59 | x 2 | include/asm/octeoninclude/asm/octeon | 342:402 (5%)817:877 (5%) | view | |
| 56 | x 2 | include/asm/octeoninclude/asm/octeon | 343:399 (5%)996:1052 (5%) | view | |
| 56 | x 2 | include/asm/octeoninclude/asm/octeon | 343:399 (5%)899:955 (5%) | view |
Duplicated Units
The list of top 30 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 17 | x 3 | alchemy/devboardsalchemy/devboardsalchemy/devboards | 188:208 153:173 131:151 | view | |
| 15 | x 2 | include/asm/mach-loongson64include/asm/mach-loongson64 | 19:35 142:159 | view | |
| 14 | x 2 | loongson2ef/commonloongson64 | 21:40 21:40 | view | |
| 14 | x 2 | sibyte/sb1250sibyte/bcm1480 | 115:131 126:142 | view | |
| 14 | x 2 | kernelkernel | 72:91 71:90 | view | |
| 14 | x 2 | kernelkernel | 42:57 179:194 | view | |
| 13 | x 2 | include/asm/mach-loongson64include/asm/mach-loongson64 | 180:194 196:210 | view | |
| 13 | x 2 | kernelkernel | 824:842 851:869 | view | |
| 11 | x 2 | pcipci | 283:294 190:201 | view | |
| 11 | x 2 | include/uapi/asminclude/uapi/asm | 35:47 55:67 | view | |
| 11 | x 2 | sgi-ip32sgi-ip32 | 52:66 70:84 | view | |
| 11 | x 2 | kernelkernel | 775:790 800:815 | view | |
| 10 | x 2 | loongson2ef/commonloongson64 | 134:145 80:91 | view | |
| 10 | x 2 | include/asm/vdsokernel | 152:164 32:44 | view | |
| 10 | x 2 | kernelkernel | 31:43 41:54 | view | |
| 10 | x 2 | kernelkernel | 57:70 56:69 | view | |
| 9 | x 2 | loongson2ef/commonloongson64 | 14:23 20:29 | view | |
| 9 | x 2 | loongson2ef/commonloongson64 | 42:54 42:54 | view | |
| 9 | x 2 | include/asminclude/asm | 250:262 130:142 | view | |
| 9 | x 3 | include/asminclude/asmkernel | 255:264 265:274 199:208 | view | |
| 9 | x 2 | sibyte/sb1250sibyte/bcm1480 | 96:106 107:117 | view | |
| 7 | x 2 | loongson2ef/commonloongson64 | 55:62 46:53 | view | |
| 7 | x 2 | kernelkernel | 112:122 137:147 | view | |
| 7 | x 2 | alchemyalchemy | 40:47 44:51 | view | |
| 7 | x 2 | alchemy/devboardsalchemy/devboards | 411:418 522:529 | view | |
| 7 | x 2 | alchemy/devboardsalchemy/devboards | 483:490 589:596 | view | |
| 6 | x 2 | loongson2ef/commonloongson64 | 19:26 25:32 | view | |
| 6 | x 2 | include/asminclude/asm | 2761:2767 2806:2812 | view | |
| 6 | x 5 | ralinkralinkralinkralinkralink | 134:141 64:71 51:58 81:88 272:279 | view | |
| 6 | x 2 | sgi-ip32sgi-ip32 | 129:136 316:323 | view |