Swift ABI Stability Manifestoを読む

by Yad

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4XJGU"#*4UBCJMJUZ .BOJGFTUPΛಡΉ ҆ୡ༐Ұ Ϋϥεϝιουגࣜձࣾ ೥݄೔ ⡥$MBTTNFUIPE *OD

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҆ୡɹ༐Ұ • 2013/12 ೖࣾ • TwitterID: @UsrNameu1 • Github: https://github.com/ UsrNameu1 • Blog: http://dev.classmethod.jp/ author/yad • ObjC/Swift/Scala/Python(R)

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4XJGU"#*4UBCJMJUZ.BOJGFTUP ⡥$MBTTNFUIPE *OD IUUQTHJUIVCDPNBQQMFTXJGUCMPC NBTUFSEPDT"#*4UBCJMJUZ.BOJGFTUPNE

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ຊ೔ͷτϐοΫ w 4XJGUͷকདྷతͳޓ׵ੑରԠ w "#*ΛֶͿಈػ w "#*ͱ͸ w "#*҆ఆԽ ⡥$MBTTNFUIPE *OD

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ຊ೔ͷτϐοΫ w 4XJGUͷকདྷతͳޓ׵ੑରԠ w "#*ΛֶͿಈػ w "#*ͱ͸ w "#*҆ఆԽ ⡥$MBTTNFUIPE *OD

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4XJGUͷকདྷతͳޓ׵ੑରԠ w ݹ͍όʔδϣϯͷ4XJGUίʔυͰ΋৽͍͠όʔδϣϯ ͷίϯύΠϥ͕ίϯύΠϧͰ͖ΔΑ͏ʹ w ϞδϡʔϧϑΝΠϧͷϑΥʔϚοτͷ҆ఆԽ w "#*ͷ҆ఆԽ ⡥$MBTTNFUIPE *OD

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⡥$MBTTNFUIPE *OD

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ຊ೔ͷτϐοΫ w 4XJGUͷকདྷతͳޓ׵ੑରԠ w "#*ΛֶͿಈػ w "#*ͱ͸ w "#*҆ఆԽ ⡥$MBTTNFUIPE *OD

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"#*ΛֶͿಈػ w ඪ४ϥΠϒϥϦͷ஌ࣝΞοϓσʔτਏ͍ w Ұ೥ޙʹ஌͕ࣝݹ͘ͳͬͯΔͷਏ͍ ⡥$MBTTNFUIPE *OD 4XJGUͷΞοϓσʔτਏ͍

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"#*ΛֶͿಈػ ⡥$MBTTNFUIPE *OD $ISJT-BUUOFSͷ఩ֶ w $ISJT-BUUOFS 4XJGUͱಉ࣌ʹ--7.ͷ࡞ऀ w "04"ຊষ--7. w ๜ޠ༁ϦϯΫ ɹIUUQNUBLBHJHJUIVCJPBPTBKB

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"#*ΛֶͿಈػ ⡥$MBTTNFUIPE *OD $ISJT-BUUOFSͷ఩ֶ ΋͏ͻͱͭɺLLVMΛܰྔͳ··ʹอͪଓ͚͍ͯΔେ͖ͳಛ௃͕͋Δ (ϥΠϒϥϦΛ࢖͏ΫϥΠΞϯτଆ͔ΒݟΔͱࢍ൱྆࿦͕͋Δ)ɻ ͦΕ͸ɺաڈͷܾஅ΋ੵۃతʹݟ௚ͯ͠ɺաڈͱͷޓ׵ੑΛؾʹͤͣʹAPIΛ େ͖͘มߋ͍ͯ͘͠ͱ͍͏͜ͱͩɻ ͨͱ͑͹LLVM IRࣗମʹେ෯ͳมߋΛՃ͑Δʹ͸ɺ͢΂ͯͷ࠷దԽύεͷมߋ ͕ඞཁʹͳΔɻ ͦͯͦ͠Ε͸ɺC++ͷAPIʹ΋େ͖ͳӨڹΛٴ΅͢ɻ LLVMͰ͸աڈʹԿ౓͔ͦ͏͍͏͜ͱ͕͋ͬͨɻ ΫϥΠΞϯτଆʹͱͬͯ͸ਏ͔ͬͨͩΖ͏͕ɺࠓޙͷ։ൃΛॱௐʹਐΊ͍ͯ͘ ͨΊʹ͸ͦ͏͢΂͖ͩͬͨɻ

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΋͏ͻͱͭɺLLVMΛܰྔͳ··ʹอͪଓ͚͍ͯΔେ͖ͳಛ௃͕͋Δ (ϥΠϒϥϦΛ࢖͏ΫϥΠΞϯτଆ͔ΒݟΔͱࢍ൱྆࿦͕͋Δ)ɻ ͦΕ͸ɺաڈͷܾஅ΋ੵۃతʹݟ௚ͯ͠ɺաڈͱͷޓ׵ੑΛؾʹͤͣʹAPIΛ େ͖͘มߋ͍ͯ͘͠ͱ͍͏͜ͱͩɻ ͨͱ͑͹LLVM IRࣗମʹେ෯ͳมߋΛՃ͑Δʹ͸ɺ͢΂ͯͷ࠷దԽύεͷมߋ ͕ඞཁʹͳΔɻ ͦͯͦ͠Ε͸ɺC++ͷAPIʹ΋େ͖ͳӨڹΛٴ΅͢ɻ LLVMͰ͸աڈʹԿ౓͔ͦ͏͍͏͜ͱ͕͋ͬͨɻ ΫϥΠΞϯτଆʹͱͬͯ͸ਏ͔ͬͨͩΖ͏͕ɺࠓޙͷ։ൃΛॱௐʹਐΊ͍ͯ͘ ͨΊʹ͸ͦ͏͢΂͖ͩͬͨɻ "#*ΛֶͿಈػ ⡥$MBTTNFUIPE *OD $ISJT-BUUOFSͷ఩ֶ

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⡥$MBTTNFUIPE *OD ͱ͸͍͑ɺਏ͍

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"#*ΛֶͿಈػ w "#*ͷ҆ఆԽ w "#*෦෼͸ഁյతมߋ͕΄΅ͳ͘ͳΔ ⡥$MBTTNFUIPE *OD 4XJGUҎ߱

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"#*ΛֶͿಈػ w "#*·ΘΓͷ஌ࣝ͸Ḋͼͳ͍ w ଞͷਓ͕࿩ͯ͠ͳ͍ωλ͕र͍΍͘͢ͳΔ ⡥$MBTTNFUIPE *OD ओཁͳಈػ

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ຊ೔ͷτϐοΫ w 4XJGUͷকདྷతͳޓ׵ੑରԠ w "#*ΛֶͿಈػ w "#*ͱ͸ w "#*҆ఆԽ ⡥$MBTTNFUIPE *OD

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"#*ͱ͸ ⡥$MBTTNFUIPE *OD w ࣮ߦ࣌ͷόΠφϦ͕ผϥΠϒϥϦΛ ݺͼग़࣌͢ʹ༻͍ΔΠϯλʔϑΣʔε 4XJGU4PVSDF #JOBSZ ֎෦ʹެ։͞Εͨ*' ֎෦ʹެ։͞Εͨ*'

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"#*ͱ͸ ⡥$MBTTNFUIPE *OD w ͭ·Γಠཱͨ͠όΠφϦͱͯ͠ίϯύΠϧ͞ΕɺϦϯ Ϋ͞ΕΔ࣌ʹຬͨ͢΂͖όΠφϦ --7.*3 ͷ࢓༷ 4XJGU 4XJGU "#* #JOBSZ

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ຊ೔ͷτϐοΫ w 4XJGUͷকདྷతͳޓ׵ੑରԠ w "#*ΛֶͿಈػ w "#*ͱ͸ w "#*҆ఆԽ ⡥$MBTTNFUIPE *OD

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"#*҆ఆԽ ⡥$MBTTNFUIPE *OD w ৽͍͠όʔδϣϯͷίϯύΠϥ͕ޓ׵ੑΛอͪͳ͕Β "#*ʹ४ڌͨ͠όΠφϦΛੜ੒͢ΔΑ͏ʹ"#*ʹറΓ Λ༩͑Δ #FGPSF "#* #JOBSZ "GUFS

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"#*҆ఆԽ ⡥$MBTTNFUIPE *OD w ҆ఆԽͷޙ΋কདྷతʹ"#*BEEJUJWFͳ௥Ճ͕ߦΘΕ ΔՄೳੑ͋Γɻͨͩ͜͠ͷ௥Ճ͸ഁյతมߋͰ͸ͳ͍ ௥Ճલ "#* #JOBSZ ௥Ճޙ

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"#*҆ఆԽ ⡥$MBTTNFUIPE *OD w όʔδϣϯ͕ҧ͏ίϯύΠϥͰϏϧυͨ͠ΞϓϦʹ04 ඪ४ϥΠϒϥϦΛಉࠝ͢Δඞཁ͕ͳ͘ͳΔ #FGPSF "#* -JC #JOBSZ "GUFS "QQ #JOBSZ OFX04 PME04 ͇ ҟͳΔ7FSͷϥΠϒϥϦͰ͸ "#*ޓ׵ੑ͕ͳ͍ ɹɹɹɹɹɹɹˣ 04ͷΞοϓσʔτͰ-JCόΠφϦͷ *'Λҡ࣋Ͱ͖ͳ͘ͳΔ

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"#*҆ఆԽ ⡥$MBTTNFUIPE *OD w όʔδϣϯ͕ҧ͏ίϯύΠϥͰϏϧυͨ͠ΞϓϦʹ04 ඪ४ϥΠϒϥϦΛಉࠝ͢Δඞཁ͕ͳ͘ͳΔ #FGPSF "#* -JC #JOBSZ "GUFS "QQ #JOBSZ OFX04 PME04 0 OFX04 PME04

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"#*҆ఆԽ ⡥$MBTTNFUIPE *OD w όʔδϣϯ͕ҧ͏ίϯύΠϥͰϏϧυͨ͠ΞϓϦʹ04 ඪ४ϥΠϒϥϦΛಉࠝ͢Δඞཁ͕ͳ͘ͳΔ #FGPSF "GUFS 0 OFX04 PME04 ҟͳΔ7FSͷϥΠϒϥϦͰ͸ "#*ޓ׵ੑ͕͋Δ ɹɹɹɹɹɹɹɹˣ 04ͷΞοϓσʔτͰ-JCόΠφϦͷ *'͸ҡ࣋͞ΕΔ ɹɹɹɹɹɹɹɹˣ "QQόΠφϦ͔Β৽-JCόΠφϦΛ ݺͼग़ͯ͠΋໰୊ͳ͍

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"#*҆ఆԽ ⡥$MBTTNFUIPE *OD w όʔδϣϯ͕ҧ͏ίϯύΠϥͰϏϧυͨ͠ΞϓϦʹ04 ඪ४ϥΠϒϥϦΛಉࠝ͢Δඞཁ͕ͳ͘ͳΔ #FGPSF "#* -JC #JOBSZ "GUFS "QQ #JOBSZ OFX04 PME04 0 OFX04 PME04

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"#*҆ఆԽ ⡥$MBTTNFUIPE *OD w ଞʹ΋ϥϯλΠϜɺΠϯϥΠϯԽʹؔ͢Δ࢓༷͕҆ఆ Խͷ՝୊ʹͳ͍ͬͯΔ໛༷

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ࢀߟαΠτ ⡥$MBTTNFUIPE *OD w 4XJGU"#*4UBCJMJUZ.BOJGFTUPSFWGE IUUQTHJUIVCDPNBQQMFTXJGUCMPCNBTUFSEPDT"#*4UBCJMJUZ.BOJGFTUPNE w 4XJGUͷ։ൃͷৼΓฦΓͱ4XJGUͷܭը͕ه͞Εͨϝʔϧͷ঺հ IUUQRJJUBDPNNPOPJUFNTDCGBFFFEC w 4XJGUΛ͍·͔ΒֶͿ4XJGU&WPMVUJPO΢Υονϯά IUUQEFWFMPQFSIBUFOBTUB⒎DPNFOUSZMFBSOBCPVUTXJGUQPJOUGSPNTXJGUFWPMVUJPO

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ࢀߟαΠτ ⡥$MBTTNFUIPE *OD w 5IF4XJGU"#* IUUQTHJUIVCDPNBQQMFTXJGUCMPCNBTUFSEPDT"#*STU w 5IF4XJGU3VOUJNF IUUQTHJUIVCDPNBQQMFTXJGUCMPCNBTUFSEPDT3VOUJNFNE