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New Feature & Tips in LLDB
2015/07/07 WWDC2015 ใڞ༗ձ
@dealforest
Toshihiro Morimoto
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ࣗݾհ
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Crying
DFTDebugScreenshot
cocoapods-browser
Tuna
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͓ئ͍
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LLDB ͷΛ͢Δͱ
λΠϜϥΠϯ͕͓ͱͳ͘͠ͳΓ
ޙͰ͜Ή͜ͱʹͳΔͷͰ
ͳΜͰ͍͍ͷͰͭͿ͍͍ͯͩ͘͞
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402 Whats's new in LLDB
Έ·͔ͨ͠ʁʁ
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ຖ LLVM ͷ࠷దԽͷ͕
͍͍ͬͯͨɻɻɻ
(ڈͩͱ PGO)
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ͱ͜Ζ͕ɺࠓ
ηογϣϯͱ͓ͯ͠ LLDB ͷ
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ૉΒ͍͠ʂʂʂ
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·͓ͣ͑ͯ͘ϙΠϯτʂ
p, po alias Έ͍ͨͳͷ
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breakpoint
breakpoint set -E swift -N allThrows
• ݴޠαϙʔτ
• lldbinit ͰॳظઃఆͰ͖ΔΑ͏ʹͳͬͨ
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breakpoint
~/.lldbinit
breakpoint set -n malloc -N memory
breakpoint set -n free -N memory
breakpoint disable memory
(lldb) breakpoint enable memory
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formatter
i = 10
(lldb) p/x i
(lldb) expression -format hex -- i
(lldb) frame variable --format hex i
(Int) $R2 = 0x000000000000000a
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formatting models
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formatting models
• `frame variable` pure LLDB ͷใΛग़ྗ
• `p` eval ͨ݁͠ՌΛ LLDB format Ͱग़ྗ
• `po` eval ͨ݁͠ՌΛݴޠຖʹΑͬͯ
࠷దͳͷΛग़ྗ (objc Ͱ͍͏ description)
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runtime
(lldb) po for i in 1...3 { print(i) }
1
2
3
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It’s All Automatic!!
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It’s All Automatic!!
in Swift…
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҆৺͍ͯͩ͘͠͞
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No content
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Xcode 6.x
:PVS$PEF OBNFT
.Z'VOD
.Z7JFX ✔
4%,'VODUJPOT /4-PH
/4.BLF3FDU ✘
4%,$MBTTFT /47JFX
/4"QQMJDBUJPO ✔
4%,$POTUBOUT /4"4$**4USJOH&ODPEJOH ✔
.BDSPT */5@."9
."9
✘
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Xcode 7.x
:PVS$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
✔
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only Swift
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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"
}
}
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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 ͋ΕͰ·͢
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protocol
4XJGU 4XJGU
1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF
%FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF
$VTUPN3FqFDUBCMF
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protocol
4XJGU 4XJGU
1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF QSJOU
%FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF EFCVH1SJOU
$VTUPN3FqFDUBCMF --%# QP
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protocol
4XJGU 4XJGU
1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF QSJOU
%FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF EFCVH1SJOU
$VTUPN3FqFDUBCMF --%# QP
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ͦΕͧΕݟ͍͖ͯ·͠ΐ͏
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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"
}
}
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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")
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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"
}
}
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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
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(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"
}
}
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(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"
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(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!!!!
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ͱ͍͑ LLDB ্Ͱ͔͑͠ͳ͍
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ͱ͍͏͜ͱ…
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break ͠ͳ͍ͱ͑ͳ͍ͱ͔…(ry
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https://github.com/dealforest/Tuna
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break ͠ͳ͍ breakpoint Λ
؆୯ʹઃఆͰ͖·͢
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No content
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Swift 2 Λར༻͢Δࡍɹɹɹɹɹɹ
͔ͳΓͤʹͳΕΔΑ
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Objective-C ͰͤʹͳΕ·͢
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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/
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·ͱΊ
LLDB ৭ʑਐԽͯ͠ΔͷͰ
৮ͬͯΈΔͱͨͷ͍͠Α
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·ͱΊ
Tuna Λͬͯ human readable ͳ
ग़ྗͰσόοάΛ͠·ͤΜ͔ʁ
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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠