Backside of coverage measurement of Go

Go Conference Tokyo 二次会のLTです！Goのカバレッジ計測の裏側について

Transcript

1. Backside of coverage measurement In Go Gopher Conference Tokyo 2019 Spring Second party May 20, 2019 @ po3rin
2. @po3rin Software Enginner @ Shiroyagi Corporation QBHF
    Golang / Python / Rust / Docker / AWS / Elasticsearch
3. QBHF
    (P
   $POGFSFODF
   5PLZP
   
   4QSJOH
   Ͱొஃ͠·ͨ͠ʂʂ IUUQTTQFBLFSEFDLDPNQPSJOEJWFJOUPCVJMELJUMMCXJUIHP
4. QBHF
    Introduction \
5. QBHF
    (P͸ඪ४ͰςετΧόϨοδΛऔΕΔ Coverage of Go Ὂ
6. QBHF
    What happened Ὂ ۀ຿Ͱ
   $PWFSBHF
   
   ͷؔ਺ͰΤϥʔ͕ɻɻͦ ͜Ͱؾ͍ͮͨ(PͷΧόϨοδͷ୲อ͢Δ΋ͷͱ͸Կ ͳͷ͔ΛΧόϨοδܭଌͷ࣮૷͔Βௐ΂ͯΈ·ͨ͠
7. QBHF
    ɾ(PͷΧόϨοδ͕ͲͷΑ͏ʹߦΘΕ͍ͯΔ ͍ͷ͔ΛཧղͰ͖Δ
   ɾ(PͷΧόϨοδͷܭଌํ๏͔Β։ൃ࣌ʹ஫ ҙ͢Δ΂͖͜ͱΛֶ΂Δ Ὂ the benefits of this talk
8. QBHF
    Reading Go source code of “cover” \
9. QBHF
    Reading Go source code of “cover” (1) Ὂ HJUIVCDPNHPMBOHHP TSDDNEDPWFS DPWFSHP
10. QBHF
     Reading Go source code of “cover” (2) Ὂ QBSTFS1BSTF'JMFͰ(PϑΝΠϧΛ੩తղੳ͍ͯ͠Δɻ FSS͸লུ
11. QBHF
     Reading Go source code of “cover” (3) Ὂ QBSTFS1BSTF'JMF
    Ͱಘͨ
    BTU'JMF
    Λ͞Βʹಠࣗͷ
    DPWFS'JMF
    ߏ଄ମʹ֨ೲ͍ͯ͠ ΔɻͦΕΛ
    BTU8BML
    ʹ౉ͯ͠ ͍Δɻͭ·Γ
    DPWFS'JMF
    ͸
    BTU7JTJU
    JOUFSGBDF
    Λ࣮૷ͯ͠ ͍Δͷ͕Θ͔Δ
12. QBHF
     Reading Go source code of “cover” (3) Ὂ BTU#MPDLʹͨͲΓண͘·Ͱ8BMLΛճ͠ଓ͚ɺϒϩοΫΛ ݟ͚ͭͨΒBEE$PVOUFSTΛಡΜͰ͍Δ
13. QBHF
     Reading Go source code of “cover” (3) Ὂ BEE$PVOUFST͕ίʔυʹΧ΢ϯλʔΛࠩ͠ࠐΜͰɺς ετதʹ͜͜Λ௨͔ͬͨΛه࿥͍ͯ͠Δɻ #PEZলུ
14. QBHF
     Show annotated source code Ὂ DPWFSBHFܭଌதʹΧ΢ϯ λʔ࢓ࠐΜͩίʔυ͕Ͳ͏ ͳ͍ͬͯΔͷ͔ΛݟΔͨΊ ͚ͩͷ୭ಘϚχΞ޲͚πʔ ϧɻ
15. QBHF
     Show annotated source code Ὂ
16. QBHF
     ΧόϨοδܭଌͷछྨ Ὂ ໋ྩ໢ཏ཰ɿTUBUFNFOU
    DPWFSBHFʣ
    ෼ذ໢ཏ཰ɿCSBODI
    DPWFSBHFʣ
    ৚݅໢ཏ཰ɿDPOEJUJPO
    DPWFSBHFʣ C0 C1 C2
17. QBHF
     ΧόϨοδܭଌͷछྨ Ὂ B
    
    C
    
    USVF
    ͷ̍έʔεΛ࣮ߦ͢Ε͹
    B
    
    C
    
    USVF
    
    B
    
    C
    
    GBMTF
    ͷέʔεΛ࣮ߦ͢Ε͹
    B
    ͱ
    C
    ͷ
    USVF
    PS
    GBMTF
    ͷ૊Έ߹Θͤ
    έʔεΛ࣮ߦ͢Ε͹ C0 C1 C2
18. QBHF
     ΧόϨοδܭଌͷछྨ Ὂ B
    
    C
    
    USVF
    ͷ̍έʔεΛ࣮ߦ͢Ε͹
    B
    
    C
    
    USVF
    
    B
    
    C
    
    GBMTF
    ͷέʔεΛ࣮ߦ͢Ε͹
    B
    ͱ
    C
    ͷ
    USVF
    PS
    GBMTF
    ͷ૊Έ߹Θͤ
    έʔεΛ࣮ߦ͢Ε͹ C0 C1 C2
19. QBHF
     ͭ·Γ(PͷΧόϨοδܭଌ͸ C0 !!!
20. QBHF
     ΧόϨοδͰ΋શύλʔϯΛ໢ཏͰ͖͍ͯΔ༁Ͱ͸ͳ͍ɻ ΧόϨοδ͚ͩʹཔΓ੾ΒͣʹɺͪΌΜͱࣗ෼Ͱ΋ύλʔϯΛ໢ ཏͰ͖͍ͯΔ͔஫ҙ࣮ͯ͠૷͍ͯ͘͠ඞཁ͕͋Δɻ
21. QBHF
     Additional Talk \
22. QBHF
     (Pͷ੩తղੳΛղઆͨ͠ബ͍ ຊʂ#PPUIͰൢച͞Εͯ·͢ɻ ੩తղੳʹڵຯΛ࣋ͬͨΒ͜Ε ΛಡΊ͹ྑ͍ɻ
23. QBHF
     (P
    $POGFSFODF
    5PLZP
    
    4QSJOH
    Ͱ΋ొஃ͠·͢ɻ Ὂ
24. Backside of coverage measurement In Go Gopher Conference Tokyo 2019 Spring Second party May 20, 2019 @ po3rin