go generate と go/ast のざっくりとした話

HPHFOFSBUF"45΀5*14 .BTBTIJ4BMWBEPS.JUTV[BXB!FVSFLB

BCPVU8IP*BN .BTBTIJ4BMWBEPS.JUTV[BXB UXJUUFS!.BTBTIJ4BMWBEPS 4FSWFSTJEFFOHJOFFS!QBJSTEJWJTJPO ܦྺ ݄%F/"ೖࣾ ݄Τ΢ϨΧೖࣾ 1)1(P%BUB.JHSBUJPOQSPEVDU։ൃ ޷͖ͳݴޠ 3VCZ
(PMBOH +BWBTDSJQU )BTLFMM ݩʑͷઐ໳ ܭࢉ࿦తਆܦՊֶʢ೴ͷۭؒهԱʹؔ͢Δ਺ཧϞσϧͷݚڀʣ ػցֶशʢಛʹڧԽֶशʣ झຯ ஡ಓࣗసंΞ΢τυΞόοΫύοΧʔ  ΧϨʔ৯͏ͨΊʹੜ͖ͯΔ

(P΀ṽ͟ͼᖃ 4JNQMJDJUZ EPU(P3PC1JLF4JNQMJDJUZJT$PNQMJDBUFE 5IFTUBUFPG(P

HPHFOFSBUF HP͝ΛႳ᥍ 5IFHPDPNNBOEIBTBOFXTVCDPNNBOE HPHFOFSBUF UPBVUPNBUFUIFSVOOJOHPGUPPMTUPHFOFSBUFTPVSDFDPEFCFGPSFDPNQJMBUJPO  θϸϖΩϰ᧸ͽς⑲ξθ⑲ώΤᓺᕧͫΝͱΓ΀ω⑲ϰ΀࣮ḝΤᥦხặͫΝ -FUUIFNBDIJOFEPUIFXPSL 3PC1JLF (FOFSBUJOHDPEF
5IF(P#MPH 3FMFBTF/PUFΚΜ (P΀ς⑲ξθ⑲ώ΀θϦϸύͽ ᑿ͖ፖ Τᔉ͟

4USJOHFS΀ᆚď໋ᙚϛϲεΚΜĐ ᨷ਺ᨷᤅ የᥙᅾ͹ᶡᙎͩͱ͖ ͥΞΤბႷᗌ͹ᔉ͡΀΁ͶΛ͖ TUSJOHFSθϣϸώ͹ᥦხᓺᕧͫΝ

4USJOHFS΀ᆚď໋ᙚϛϲεΚΜĐ QJMMHP QJMM@TUSJOHHP ᥦხᓺᕧͧΞͱθ⑲ώĐ ᥦხᓺᕧ΁͖͖͞ 5IFSFTOPRVFTUJPOUIFHFOFSBUFENFUIPEJTVHMZ 5IBUT0, UIPVHI CFDBVTFIVNBOTEPOUOFFEUPXPSLPOJU 3PC1JLF
(FOFSBUJOHDPEF 5IF(P#MPH ຖỹTUSJOHFSθϣϸώΤຒ͡Ħ.BLFGJMFᄑͽ᪝ΑࠐΒĦ ᨷ਺ᨷᤅϚΦΩϰ͞૿͚ͱΛ

4USJOHFS΀ᆚď໋ᙚϛϲεΚΜĐ QJMMHPXJUIHPHFOFSBUF -FUTHPHFOFSBUF

HPHFOFSBUFͺᷯΡͭ͸ᑿ͚Νθ⑲ώᓺᕧω⑲ϰ DMJQQFSIPVTFHFO NPOPDISPNFHBOFBSHFO ཋ᪦ମͽ"DUJWF3FDPSEϮΩδͼϦςψώΤᓺᕧ ODXHPUFNQMBUF ᬥᨷͩͱUFNQMBUF 4FU )FBQ ಠᥦᨷᤅ൱ĐͽᷯΡͭ͸θ⑲ώΤᓺᕧ QRVFSOBGGKTPO
ᴢᓝΚΜᖩ͖.BSTIBM+40/6ONBSTIBM+40/Τᓺᕧ

ͯ΀᳔Κ͔͡Νᑿᠭ᎚ NPDL΀ᓺᕧ WFLUSBNPDLFSZ HPMBOHNPDL +40/ᄑϚΨ⑲ϰώτε΀ᓺᕧ GBWDMJQKXH XJUIHPCJOEBUB

FVSFLB͹΀ሆᠭᆚ ᧸ᘥ΀HPCJOEBUB SPVUJOH΀ᕓᨷϚΦΩϰ͝Λς⑲ξθ⑲ώ΀ᓺᕧ TFSWJDFGBDBEFXPSLFSᄑᥦხᓺᕧͩ͸͖ΝϯϢνύϯΔ ό⑲τมỐᠭ΀ΧϜϯζ⑲μϬϸ ϲνψδĤᤫ΀ᗌ͞ᶶ᠓ͼᐙᐠͲ࣮ͣ૷ͫΝ !.BTBTIJ4BMWBEPS෪ᤫͺͩ͸ YP͹%#͝ΛᬿᨭϧόϰΤᓺᕧ

ͥͥ͝Λ"45΀ề

HFOFSBUF͹ᑿ͘උ᪽θϣϸώ͵͸ͻ͘ხ͖͸ΝΥͲĦͺ͖͘ᤃዧ ᆚ͚΂+40/΀ϚΨ⑲ϰώτεᓺᕧ --᧣ͼൃᓡ ͹ͺΜ͔͚ͬᩆྥᶡḿ͹៬ᦐΝ ǹ ͶΛ͖ උ᪽θϣϸώ΀ς⑲ξΤಡΒͺ"45Τᑿ͵͸͖ΝΛ͖ͩ "45 ᱢᓯཋየኴ
θϸϖΩϮ͞࿖͘ϜϲεϮϥ΀ᬊණᶡḿ ďͼͻϜϲεϮϥ΀᣾ዳͽؔ๹΀ͼ͖ဒ߸΁ᕭᅊͧΞΝ ϜϲεϮϥª TDBOOFS ª5PLFO΀ᅾª QBSTFS ª"45 ᶝ᫿ϮΩϛϮϯHPBTU HPQBSTFS HPUPLFO᪰͞᦬ͩ͸͖Ν

HPBTU HPQBSTFS HPUPLFO΀ᑿ͖ፖ ཋየኴ᳼ᓷᠭ΀ؔ਺ *OTQFDU TXJUDIΔͩ͡΁ṞΧκ⑲μϬϸ͹኷᧣΀ϓ⑲ώΤᄌΝ 8BML
຾͵ͱΛ1SJOUຉ΀ؔ਺͹ኴᥦମΤ฼Ν 1SJOU 'QSJOU

ͯ΀᳔BTUΤᑿ͵͸͹͟Νͥͺ ੩᧣ḑᔡ ᘊỖᏝࡶႷ΀ຌᒿ IUUQRJJUBDPNLOTIJUFNTGEGCFDDB FYQPSUͧΞ͸͖Ν͞ዹᑿᠭ΀ม਺΀ݕᬰ KHBVUIFSPOVTFEFYQPSUT
Ჩͺͩ͸᪞ΜጿͧΞ͸͖Ν਺ᥙΖየᥙᅾ΀ݕᲇ

ΐͺΓ HPHFOFSBUF ཋ᪦ମ΀ቤΓࠐΑΤᑿ͘ͺͥΟͺᫍΑᐠͣͶͶ͘ΐ͡ᑿ͘ͺ ჯͪΚ͘ͼᶡဒ΀෶ᖃ΁UFNQMBUFͽᄢͺͩ͸ᥦხᓺᕧ͹͟Νͺ WTSFGMFDU
ϖϚή⑲ϣϸξďᖩႷĐ᧣ͽዧ᩼͞ပͥΜΖ͖ͫ ࣮ḝᙉͽQBOJD᧣ͼͥͺͽͼΜΖ͖ͫ JOUFSGBDF\^Ṟᙼ͖ HPBTU ᣾៷ͺඦ୯ BOOPUBUJPOΤ᳼ͫϚΨ⑲ϰώτεΤḑᔡͫΝᄑ΁ᷡΜͺၛᲝ͖ ၛᲝ͖͞Θ͚ͽಡΓΝᔉͣΝ SFBEBCJMJUZJTUIFNPTUJNQPSUBOUGFBUVSFPGQSPHSBNNJOHMBOHVBHF

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go generate と go/ast のざっくりとした話

go generate と go/ast のざっくりとした話

Masashi Salvador Mitsuzawa

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HPHFOFSBUF"45΀5*14 .BTBTIJ4BMWBEPS.JUTV[BXB!FVSFLB

BCPVU8IP*BN .BTBTIJ4BMWBEPS.JUTV[BXB UXJUUFS!.BTBTIJ4BMWBEPS 4FSWFSTJEFFOHJOFFS!QBJSTEJWJTJPO ܦྺ ݄%F/"ೖࣾ ݄Τ΢ϨΧೖࣾ 1)1(P%BUB.JHSBUJPOQSPEVDU։ൃ ޷͖ͳݴޠ 3VCZ

(P΀ṽ͟ͼᖃ 4JNQMJDJUZ EPU(P3PC1JLF4JNQMJDJUZJT$PNQMJDBUFE 5IFTUBUFPG(P

HPHFOFSBUF HP͝ΛႳ᥍ 5IFHPDPNNBOEIBTBOFXTVCDPNNBOE HPHFOFSBUF UPBVUPNBUFUIFSVOOJOHPGUPPMTUPHFOFSBUFTPVSDFDPEFCFGPSFDPNQJMBUJPO  θϸϖΩϰ᧸ͽς⑲ξθ⑲ώΤᓺᕧͫΝͱΓ΀ω⑲ϰ΀࣮ḝΤᥦხặͫΝ -FUUIFNBDIJOFEPUIFXPSL 3PC1JLF (FOFSBUJOHDPEF

4USJOHFS΀ᆚď໋ᙚϛϲεΚΜĐ ᨷ਺ᨷᤅ የᥙᅾ͹ᶡᙎͩͱ͖ ͥΞΤბႷᗌ͹ᔉ͡΀΁ͶΛ͖ TUSJOHFSθϣϸώ͹ᥦხᓺᕧͫΝ

4USJOHFS΀ᆚď໋ᙚϛϲεΚΜĐ QJMMHP QJMM@TUSJOHHP ᥦხᓺᕧͧΞͱθ⑲ώĐ ᥦხᓺᕧ΁͖͖͞ 5IFSFTOPRVFTUJPOUIFHFOFSBUFENFUIPEJTVHMZ 5IBUT0, UIPVHI CFDBVTFIVNBOTEPOUOFFEUPXPSLPOJU 3PC1JLF

4USJOHFS΀ᆚď໋ᙚϛϲεΚΜĐ QJMMHPXJUIHPHFOFSBUF -FUTHPHFOFSBUF

HPHFOFSBUFͺᷯΡͭ͸ᑿ͚Νθ⑲ώᓺᕧω⑲ϰ DMJQQFSIPVTFHFO NPOPDISPNFHBOFBSHFO ཋ᪦ମͽ"DUJWF3FDPSEϮΩδͼϦςψώΤᓺᕧ ODXHPUFNQMBUF ᬥᨷͩͱUFNQMBUF 4FU )FBQ ಠᥦᨷᤅ൱ĐͽᷯΡͭ͸θ⑲ώΤᓺᕧ QRVFSOBGGKTPO

ͯ΀᳔Κ͔͡Νᑿᠭ᎚ NPDL΀ᓺᕧ WFLUSBNPDLFSZ HPMBOHNPDL +40/ᄑϚΨ⑲ϰώτε΀ᓺᕧ GBWDMJQKXH XJUIHPCJOEBUB

FVSFLB͹΀ሆᠭᆚ ᧸ᘥ΀HPCJOEBUB SPVUJOH΀ᕓᨷϚΦΩϰ͝Λς⑲ξθ⑲ώ΀ᓺᕧ TFSWJDFGBDBEFXPSLFSᄑᥦხᓺᕧͩ͸͖ΝϯϢνύϯΔ ό⑲τมỐᠭ΀ΧϜϯζ⑲μϬϸ ϲνψδĤᤫ΀ᗌ͞ᶶ᠓ͼᐙᐠͲ࣮ͣ૷ͫΝ !.BTBTIJ4BMWBEPS෪ᤫͺͩ͸ YP͹%#͝ΛᬿᨭϧόϰΤᓺᕧ

FVSFLB͹΀ሆᠭᆚ ᧸ᘥ΀HPCJOEBUB SPVUJOH΀ᕓᨷϚΦΩϰ͝Λς⑲ξθ⑲ώ΀ᓺᕧ TFSWJDFGBDBEFXPSLFSᄑᥦხᓺᕧͩ͸͖ΝϯϢνύϯΔ ό⑲τมỐᠭ΀ΧϜϯζ⑲μϬϸ ϲνψδĤᤫ΀ᗌ͞ᶶ᠓ͼᐙᐠͲ࣮ͣ૷ͫΝ !.BTBTIJ4BMWBEPS෪ᤫͺͩ͸ YP͹%#͝ΛᬿᨭϧόϰΤᓺᕧ

ͥͥ͝Λ"45΀ề

HFOFSBUF͹ᑿ͘උ᪽θϣϸώ͵͸ͻ͘ხ͖͸ΝΥͲĦͺ͖͘ᤃዧ ᆚ͚΂+40/΀ϚΨ⑲ϰώτεᓺᕧ --᧣ͼൃᓡ ͹ͺΜ͔͚ͬᩆྥᶡḿ͹៬ᦐΝ ǹ ͶΛ͖ උ᪽θϣϸώ΀ς⑲ξΤಡΒͺ"45Τᑿ͵͸͖ΝΛ͖ͩ "45 ᱢᓯཋየኴ

HPBTU HPQBSTFS HPUPLFO΀ᑿ͖ፖ ཋየኴ᳼ᓷᠭ΀ؔ਺ *OTQFDU TXJUDIΔͩ͡΁ṞΧκ⑲μϬϸ͹኷᧣΀ϓ⑲ώΤᄌΝ 8BML

ᆚ

ͯ΀᳔BTUΤᑿ͵͸͹͟Νͥͺ ੩᧣ḑᔡ ᘊỖᏝࡶႷ΀ຌᒿ IUUQRJJUBDPNLOTIJUFNTGEGCFDDB FYQPSUͧΞ͸͖Ν͞ዹᑿᠭ΀ม਺΀ݕᬰ KHBVUIFSPOVTFEFYQPSUT

ΐͺΓ HPHFOFSBUF ཋ᪦ମ΀ቤΓࠐΑΤᑿ͘ͺͥΟͺᫍΑᐠͣͶͶ͘ΐ͡ᑿ͘ͺ ჯͪΚ͘ͼᶡဒ΀෶ᖃ΁UFNQMBUFͽᄢͺͩ͸ᥦხᓺᕧ͹͟Νͺ WTSFGMFDU

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