New Feature & Tips in LLDB 2015/07/07 WWDC2015 ৘ใڞ༗ձ @dealforest Toshihiro Morimoto

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Crying DFTDebugScreenshot cocoapods-browser Tuna

͓ئ͍

LLDB ͷ࿩Λ͢Δͱ λΠϜϥΠϯ͕͓ͱͳ͘͠ͳΓ ޙͰ΁͜Ή͜ͱʹͳΔͷͰ ͳΜͰ΋͍͍ͷͰͭͿ΍͍͍ͯͩ͘͞

402 Whats's new in LLDB Έ·͔ͨ͠ʁʁ

ຖ೥ LLVM ͷ࠷దԽͷ࿩͕ ͸͍͍ͬͯͨɻɻɻ (ڈ೥ͩͱ PGO)

ͱ͜Ζ͕ɺࠓ೥͸ ηογϣϯͱ͓ͯ͠ LLDB ͷ࿩

ૉ੖Β͍͠ʂʂʂ

·ͣ཈͓͑ͯ͘ϙΠϯτʂ p, po ͸ alias Έ͍ͨͳ΋ͷ

breakpoint breakpoint set -E swift -N allThrows • ݴޠαϙʔτ • lldbinit ͰॳظઃఆͰ͖ΔΑ͏ʹͳͬͨ

breakpoint ~/.lldbinit breakpoint set -n malloc -N memory breakpoint set -n free -N memory breakpoint disable memory (lldb) breakpoint enable memory

formatter i = 10 (lldb) p/x i (lldb) expression -format hex -- i (lldb) frame variable --format hex i (Int) $R2 = 0x000000000000000a

formatting models

formatting models • `frame variable` ͸ pure LLDB ͷ৘ใΛग़ྗ • `p` ͸ eval ͨ݁͠ՌΛ LLDB format Ͱग़ྗ • `po` ͸ eval ͨ݁͠ՌΛݴޠຖʹΑͬͯ ࠷దͳ΋ͷΛग़ྗ (objc Ͱ͍͏ description)

runtime (lldb) po for i in 1...3 { print(i) } 1 2 3

It’s All Automatic!!

It’s All Automatic!! in Swift…

҆৺͍ͯͩ͘͠͞

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Xcode 6.x :PVS$PEF OBNFT .Z'VOD .Z7JFX ✔ 4%,'VODUJPOT /4-PH /4.BLF3FDU ✘ 4%,$MBTTFT /47JFX /4"QQMJDBUJPO ✔ 4%,$POTUBOUT /4"4$**4USJOH&ODPEJOH ✔ .BDSPT */5@."9 ."9 ✘

Xcode 7.x :PVS$PEF OBNFT .Z'VOD .Z7JFX ✔ 4%,'VODUJPOT /4-PH /4.BLF3FDU ✔ 4%,$MBTTFT /47JFX /4"QQMJDBUJPO ✔ 4%,$POTUBOUT /4"4$**4USJOH&ODPEJOH ✔ .BDSPT */5@."9 ."9 ✔

only Swift

type lookup protocol HogeProtocol { func hoge() -> String } struct Hoge: HogeProtocol { let a: String internal let b: String private let c: String func aa() { } internal func ab() { } private func ac() { } func hoge() -> String { return "hoge" } }

type lookup protocol HogeProtocol { func hoge() -> String } struct Hoge: HogeProtocol { let a: String internal let b: String private let c: String func aa() { } internal func ab() { } private func ac() { } func hoge() -> String { return "hoge" } } (lldb) type lookup Hoge struct Hoge : HogeProtocol { let a: Swift.String let b: Swift.String let c: Swift.String func aa() func ab() func ac() func hoge() -> Swift.String init(a: Swift.String, b: Swift.String, c: Swift.String) } (lldb) type lookup HogeProtocol protocol HogeProtocol { func hoge() -> Swift.String } protocol extension ΋͋Ε͹Ͱ·͢

protocol 4XJGU 4XJGU 1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF %FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF $VTUPN3FqFDUBCMF

protocol 4XJGU 4XJGU 1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF QSJOU %FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF EFCVH1SJOU $VTUPN3FqFDUBCMF --%# QP

protocol 4XJGU 4XJGU 1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF QSJOU %FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF EFCVH1SJOU $VTUPN3FqFDUBCMF --%# QP

ͦΕͧΕݟ͍͖ͯ·͠ΐ͏

print protocol HogeProtocol { func hoge() -> String } struct Hoge: HogeProtocol { let a: String internal let b: String private let c: String func aa() { } internal func ab() { } private func ac() { } func hoge() -> String { return "hoge" } }

print protocol HogeProtocol { func hoge() -> String } struct Hoge: HogeProtocol { let a: String internal let b: String private let c: String func aa() { } internal func ab() { } private func ac() { } func hoge() -> String { return "hoge" } } let hoge = Hoge( a: “aaaaa", b: “bbbbb", c: “ccccccccc" ) print(hoge) —————————————————————————————— > Sample.Hoge(a: "aaaaa", b: "bbbbb", c: “ccccccccc")

debugPrint protocol HogeProtocol { func hoge() -> String } struct Hoge: HogeProtocol { let a: String internal let b: String private let c: String func aa() { } internal func ab() { } private func ac() { } func hoge() -> String { return "hoge" } }

debugPrint protocol HogeProtocol { func hoge() -> String } struct Hoge: HogeProtocol { let a: String internal let b: String private let c: String func aa() { } internal func ab() { } private func ac() { } func hoge() -> String { return "hoge" } } let hoge = Hoge( a: “aaaaa", b: “bbbbb", c: “ccccccccc" ) debugPrint(hoge) —————————————————————————————— > Sample.Hoge(a: "aaaaa", b: "bbbbb", c: “ccccccccc") ΧελϚΠζ͠ͳ͍ݶΓجຊಉ͡

(lldb) po protocol HogeProtocol { func hoge() -> String } struct Hoge: HogeProtocol { let a: String internal let b: String private let c: String func aa() { } internal func ab() { } private func ac() { } func hoge() -> String { return "hoge" } }

(lldb) po protocol HogeProtocol { func hoge() -> String } struct Hoge: HogeProtocol { let a: String internal let b: String private let c: String func aa() { } internal func ab() { } private func ac() { } func hoge() -> String { return "hoge" } } let hoge = Hoge( a: “aaaaa", b: “bbbbb", c: “ccccccccc" ) —————————————————————————————— (lldb) po hoge ▿ Sample.Hoge - a : "aaaaa" - b : "bbbbb" - c : "ccccccccc"

(lldb) po protocol HogeProtocol { func hoge() -> String } struct Hoge: HogeProtocol { let a: String internal let b: String private let c: String func aa() { } internal func ab() { } private func ac() { } func hoge() -> String { return "hoge" } } let hoge = Hoge( a: “aaaaa", b: “bbbbb", c: “ccccccccc" ) —————————————————————————————— (lldb) po hoge ▿ Sample.Hoge - a : "aaaaa" - b : "bbbbb" - c : "ccccccccc" human readable!!!!

ͱ͸͍͑ LLDB ্Ͱ͔͠࢖͑ͳ͍

ͱ͍͏͜ͱ͸…

break ͠ͳ͍ͱ࢖͑ͳ͍ͱ͔…(ry

https://github.com/dealforest/Tuna

break ͠ͳ͍ breakpoint Λ ؆୯ʹઃఆͰ͖·͢

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Swift 2 Λར༻͢Δࡍ͸ɹɹɹɹɹɹ ͔ͳΓ޾ͤʹͳΕΔΑ

Objective-C Ͱ΋޾ͤʹͳΕ·͢

Tips • ηογϣϯຖͷ hisotry ͩͬͨͷ͕ stop / start ͯ͠΋࢒ΔΑ͏ʹͳͬͨ • ~/.lldbinit-Xcode ΛΈͳ͘ͳͬͨ • all exception breakpoint Debugger command `po $arg1`Λ͠ͱ͚͹ fatal error message ͕ΈΕΔΑ http://natashatherobot.com/xcode-debugging-trick/

·ͱΊ LLDB ΋৭ʑਐԽͯ͠ΔͷͰ ৮ͬͯΈΔͱͨͷ͍͠Α

·ͱΊ Tuna Λ࢖ͬͯ human readable ͳ ग़ྗͰσόοάΛ͠·ͤΜ͔ʁ

͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠