Intrducing debug in WWDC2016

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Intrducing debug in WWDC2016 2016/07/01 WWDC.next @dealforest Toshihro Morimoto

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ࣗݾ঺հ

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No content

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WWDC2016 Debug Session 1. #410 - Visual Debugging with Xcode 2. #412 - Thread Sanitizer and Static Analysis 3. #417 - Debugging Tips and Tricks

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WWDC2016 Debug Session 1. #410 - Visual Debugging with Xcode (100P) 2. #412 - Thread Sanitizer and Static Analysis (64P) 3. #417 - Debugging Tips and Tricks (494P)

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WWDC2016 Debug Session 1. #410 - Visual Debugging with Xcode (100P) 2. #412 - Thread Sanitizer and Static Analysis (64P) 3. #417 - Debugging Tips and Tricks (494P)

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͜Μͳͷ 10 ෼Ͱ ঺հͰ͖ΔΘ͚ͳ͍Ͱ͢ΑͶwww

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ͱ͍͏Θ͚Ͱૣ଎͍͖·͢

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LLDB ͜ͱ͸͡Ί

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LLDB ͜ͱ͸͡Ί

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ม਺Λग़ྗ͢Δ • p • po • frame variable

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your app LLDB Swift Compiler inject

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your app LLDB Swift Compiler inject p, po ͸͜ͷλΠϓ

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your app LLDB Swift Compiler inject p: ΞϓϦଆͰ LLDB ͷ৘ใΛग़ྗ po: ΞϓϦଆͰఆٛͨ͠৘ใ(description)Λग़ྗ

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ͨͩ͠ʂʂʂʂ

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inject ʹࣦഊ͢Δέʔε͕ Swift Ͱ͸ͨ·ʹൃੜ͠·͢

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LLDB ͷΤϥʔϝοηʔδͷΈ දࣔ͞Ε·͢

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ͭ·Γ͸࣮ߦ݁Ռ͕ ಘΒΕͳ͍Θ͚Ͱ͢Ͷ

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ͦΜͳ࣌͸ frame variable Λ ࢖͍·͠ΐ͏

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LLDB Swift Compiler frame variable ͸ LLDB ͷதͰ׬݁͠·͢

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͜ΕͰͲΜͳঢ়گͰ΋ ม਺ͷग़ྗ͕ಘΒΕΔΑ͏ʹͳΓ·͢

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͜Ε͚ͩ஌ͬͱ͍ͯ΋Β͑Ε͹ ࠷௿ݶ࢖͑Δ͔ͳͱࢥ͍·͢

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Ͱ͸͜Ε͔Βۦ͚଍Ͱ ൃද͞Εͨ಺༰Λ ΩϟνΞοϓ͍͖ͯ͠·͠ΐ͏

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ม਺Λग़ྗ͢Δ • p • po • frame variable • parray • poarray

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ม਺Λग़ྗ͢Δ • p • po • frame variable • parray • poarray parray, poarray ͸ C ϙΠϯλ ͷ഑ྻΛදࣔ

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ม਺Λग़ྗ͢Δ int count = 5; int data[5] = { 1000, 2, 3, 17, 50 }; int *dataset = data; (lldb) p dataset (int *) $1 = 0x00007fff5a5bedb0 (lldb) po dataset 0x00007fff5a5bedb0 (lldb) parray 5 dataset (int *) $3 = 0x00007fff5a5bedb0 { (int) [0] = 1000 (int) [1] = 2 (int) [2] = 3 (int) [3] = 17 (int) [4] = 50 }

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ม਺Λग़ྗ͢Δ int count = 5; int data[5] = { 1000, 2, 3, 17, 50 }; int *dataset = data;

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ม਺Λग़ྗ͢Δ int count = 5; int data[5] = { 1000, 2, 3, 17, 50 }; int *dataset = data; (lldb) poarray `count` dataset { 1000 2 3 17 50 }

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Objective-C ͷΠϯελϯεΛग़ྗ Objective-C Ͱ࡞ΒΕͨΠϯελϯε (lldb) po 0x1003183e0 Enrico, 700 Swift Street, Mountain View, CA

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Objective-C ͷΠϯελϯεΛग़ྗ Objective-C Ͱ࡞ΒΕͨΠϯελϯε (lldb) po 0x1003183e0 Enrico, 700 Swift Street, Mountain View, CA Swift ͷίʔυ (lldb) po 0x1003183e0 4298212320

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Objective-C ͷΠϯελϯεΛग़ྗ Objective-C Ͱ࡞ΒΕͨΠϯελϯε (lldb) po 0x1003183e0 Enrico, 700 Swift Street, Mountain View, CA Swift ͷίʔυ (lldb) po 0x1003183e0 4298212320 (lldb) expr -O --language objc -- 0x1003183e0 Enrico, 700 Swift Street, Mountain View, CA po ͱ expr -O ͸ಉٛͰ͢

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import module (lldb) p [NSApplication sharedApplication].undoManager error: property ‘undoManager’ not found on object of type ‘id’

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import module (lldb) p [NSApplication sharedApplication].undoManager error: property ‘undoManager’ not found on object of type ‘id’ (lldb) p @import AppKit (lldb) p [NSApplication sharedApplication].undoManager (NSUndoManager * __nullable) $1 = 0x00007fb399629cd0

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auto import module (lldb) p [NSApplication sharedApplication].undoManager (NSUndoManager * __nullable) $1 = 0x00007fb399629cd0

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auto import module (lldb) p [NSApplication sharedApplication].undoManager (NSUndoManager * __nullable) $1 = 0x00007fb399629cd0 ͜ͷػೳΛແޮʹ͢Δ͜ͱ΋Ͱ͖·͢ (lldb) settings show target.auto-import-clang-modules false

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ΧελϚΠζΛӬଓԽ • ~/.lldbinit or ~/.lldbinit-Xcode ʹίϚϯυΛॻ͍ ͓͚ͯ͹ىಈ࣌ʹ࣮ߦ͞ΕΔ • Python ͷϥΠϒϥϦΛ import ͓͚ͯ͠͹ LLDB ͕ attach ͞Εͨ࣌ʹ͙͢࢖͑Δ

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REPL $ swift Welcome to Apple Swift version 3.0. Type :help for assistance. 1> po "Welcome to WWDC.next!!" error: repl.swift:2:3: error: consecutive statements on a line must be separated by ';' po "Welcome to WWDC.next!!" ^ ; 1> :po "Welcome to WWDC.next!!" "Welcome to WWDC.next!!"

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REPL $ swift Welcome to Apple Swift version 3.0. Type :help for assistance. 1> :type lookup Comparable protocol Comparable : Equatable { @warn_unused_result func <(lhs: Self, rhs: Self) -> Swift.Bool @warn_unused_result func <=(lhs: Self, rhs: Self) -> Swift.Bool @warn_unused_result func >=(lhs: Self, rhs: Self) -> Swift.Bool @warn_unused_result func >(lhs: Self, rhs: Self) -> Swift.Bool }

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breakpoint ΋࢖͑·͢

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צͷ͍͍ਓ͸ؾ෇͍͔ͨ΋͠Ε·ͤΜ

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Playgroud Ͱ΋ LLDB ͕ಈ͘ͷ͔ʂʂʂ

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ͱࢥͬͨਓ΋͍ΔͰ͠ΐ͏

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࢒೦ͳ͕ΒμϝͰͨ͠

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ͨͩ͠࢖͑Δະདྷ͕ ΍ͬͯ͘Δ͔΋͠Ε·ͤΜͶ

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REPL let value: Int? = 10 value + 10 ⚠Value of optional type 'Optional' not unwrapped; did you mean to use '!' or '?'?

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REPL let value: Int? = 10 value + 10 ⚠Value of optional type 'Optional' not unwrapped; did you mean to use '!' or '?'? (lldb) p Optional(10) + 10 (Int) $R0 = 20 Fixit applied, ﬁxed expression was: Optional(10)! + 10

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Breakpoint • Symbolic Breakpoints • ಛఆͷ method, property ʹ step-in ͢Δ sif • ͲͷόΠφϦ͕ϩʔυ͞Ε͍ͯΔͷ͔ image list • --queue-name (or -q) Ͱಛఆͷ queue ͕ dequeue ͞ΕΔλ ΠϛϯάͰ attach Ͱ͖Δ

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Breakpoint • ύλʔϯϚονϯάͰ attach ͢Δ͜ͱ͕Ͱ͖Δ function໊, ಛఆͷιʔείʔυͳͲ

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Breakpoint • ύλʔϯϚονϯάͰ attach ͢Δ͜ͱ͕Ͱ͖Δ function໊, ಛఆͷιʔείʔυͳͲ // Break here (lldb) break set --source-regexp "// Break here" -f main.swift

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Low-Level Debugging • Optimized code • Third-party code with no debug info

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Low-Level Debugging • Optimized code • Third-party code with no debug info ୭͠΋Ұ౓͸ܦݧ͋Δ͔ͱ͸ࢥ͍·͢

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Low-Level Debugging • Optimized code • Third-party code with no debug info ͭΒ͍Ͱ͢ΑͶ…

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͜͜Ͱ͸;Ε·ͤΜ͕ 417 - Debugging Tips and Tricks ʹৄࡉ͕͋Γ·͢

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State Machine Quick Look

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Thread Sanitizer (TSan)

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only support • 64-bit macOS • 64-bit iOS and tvOS simulators

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Low-Level Debugging • Optimized code • Third-party code with no debug info FPS Performance Gauge

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Low-Level Debugging • Optimized code • Third-party code with no debug info Memory Graph Debugging

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iOSDC Ͱ͜ͷลΓͷࣄΛ࿩͔͢΋͠Ε·ͤΜ

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·ͱΊ ػೳ௥Ճ΋͞Δ͜ͱͳ͕Β ࢿྉʹ͸طଘͷ؀ڥͰ΋ ͙͢ʹ࢖͑Δϊ΢ϋ΢͕ ͨ͘͞Μॻ͔Ε͍ͯ·͢

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·ͱΊ ࠓ͙͢ʹͰ΋࢖͑ΔͷͰ ಡΉͱσόοάϥΠϑ͕ ޾ͤʹͳΔ͔΋͠Ε·ͤΜͶ

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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠