Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Debugging in Swift
Search
Carola Nitz
March 22, 2015
Technology
19
23k
Debugging in Swift
This talk will give you some helpful tips and tricks when you struggle with Debugging
Carola Nitz
March 22, 2015
Tweet
Share
More Decks by Carola Nitz
See All by Carola Nitz
Beware of the legacy! The one you inherit and the one you create
carola
0
210
Debugging - Things your senior hasn't told you about
carola
6
1.8k
Code Snippets for Debugging
carola
1
260
Other Decks in Technology
See All in Technology
プロダクトエンジニアを支えるための開発生産性向上施策
tsukakei
0
140
Mocking in Rust Applications
taiki45
1
380
スタッフエンジニアの道: The Staff Engineer’s Path
snoozer05
PRO
41
13k
Optuna: a Black-Box Optimization Framework
pfn
PRO
1
110
なにもしてないのにNew Relicのデータ転送量が増えていたときに確認したこと
tk3fftk
2
200
20240912 JJUGナイトセミナー
mii1004
0
130
20240906_JAWS_Yamanashi_#1_leap_beyond_the_AWS_all_certifications
tsumita
1
280
eBPFのこれまでとこれから
yutarohayakawa
5
380
「家族アルバム みてね」における運用管理・ オブザーバビリティの全貌 / Overview of Operation Management and Observability in FamilyAlbum
isaoshimizu
4
150
エンジニア向け会社紹介資料
caddi_eng
15
250k
React Aria で実現する次世代のアクセシビリティ
ryo_manba
4
1.2k
自社サービスのための独自リリース版Redmine「RedMica」の取り組み
vividtone
0
1.1k
Featured
See All Featured
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
278
13k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
166
48k
Why You Should Never Use an ORM
jnunemaker
PRO
53
8.9k
Raft: Consensus for Rubyists
vanstee
135
6.5k
How to name files
jennybc
75
98k
In The Pink: A Labor of Love
frogandcode
139
22k
Done Done
chrislema
180
16k
Build your cross-platform service in a week with App Engine
jlugia
228
18k
The MySQL Ecosystem @ GitHub 2015
samlambert
250
12k
Designing the Hi-DPI Web
ddemaree
278
34k
Building a Modern Day E-commerce SEO Strategy
aleyda
36
6.8k
How GitHub Uses GitHub to Build GitHub
holman
472
290k
Transcript
Debugging in Swift how hard can it be @_Caro _N,
22/3/2015
Why do we struggle with debugging? @_Caro _N, 22/3/2015
Output is not helpful (lldb) po objectiveCString 0x00007fbaa1f24910 (ObjectiveC.NSObject =
{}) @_Caro _N, 22/3/2015
Error messages make no sense @_Caro _N, 22/3/2015
What?! That tool exists? @_Caro _N, 22/3/2015
How debugging should be like • Get to the content
of interest @_Caro _N, 22/3/2015
How debugging should be like • Get to the content
of interest • Get helpful error messages @_Caro _N, 22/3/2015
How debugging should be like • Get to the content
of interest • Get helpful error messages • Display additional information where needed @_Caro _N, 22/3/2015
How debugging should be like • Get to the content
of interest • Get helpful error messages • Display additional information where needed • Know about debugging tools @_Caro _N, 22/3/2015
LLDB @_Caro _N, 22/3/2015
Expression (lldb) po objectiveCString 0x00007fbaa1f24910 (ObjectiveC.NSObject = {}) @_Caro _N,
22/3/2015
Expression (lldb) expression -O -- objectiveCString 0x00007fbaa1f24910 (ObjectiveC.NSObject = {})
@_Caro _N, 22/3/2015
Magic command (lldb) expression -l objc -O -- (id) 0x00007fbaa1f24910
@_Caro _N, 22/3/2015
Magic command (lldb) expression -l objc -O -- (id) 0x00007fbaa1f24910
I'm a fancy Objective-C String @_Caro _N, 22/3/2015
Breakpoints @_Caro _N, 22/3/2015
Editing Breakpoints @_Caro _N, 22/3/2015
Editing Breakpoints @_Caro _N, 22/3/2015
Editing Breakpoints @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch • Catch OpenGL ES errors @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch • Catch OpenGL ES errors • Stop when executing a specific function or method @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch • Catch OpenGL ES errors • Stop when executing a specific function or method • Stop when test Assertions fail @_Caro _N, 22/3/2015
Symbolic Breakpoints @_Caro _N, 22/3/2015
Symbolic Breakpoints @_Caro _N, 22/3/2015
Compiler errors @_Caro _N, 22/3/2015
Approach? @_Caro _N, 22/3/2015
1. Remove variables @_Caro _N, 22/3/2015
2. Split instructions @_Caro _N, 22/3/2015
Add return type @_Caro _N, 22/3/2015
Launch arguments @_Caro _N, 22/3/2015
Adding arguments in the scheme editor @_Caro _N, 22/3/2015
Concurrency -com.apple.CoreData.ConcurrencyDebug 1 @_Caro _N, 22/3/2015
SQL Statements -com.apple.CoreData.SQLDebug 3 @_Caro _N, 22/3/2015
Many more -com.apple.CoreData.MigrationDebug -com.apple.CoreData.SQLiteDebugSynchronous [0,1,2] -com.apple.CoreData.SQLiteIntegrityCheck 1 -com.apple.CoreData.ThreadingDebug [1,2,3] http://matthewmorey.com/tools-for-core-data/
@_Caro _N, 22/3/2015
Localization • -NSDoubleLocalizedStrings 1 @_Caro _N, 22/3/2015
Localization • -NSDoubleLocalizedStrings 1 • -NSShowNonLocalizedStrings 1 @_Caro _N, 22/3/2015
Localization • -NSDoubleLocalizedStrings 1 • -NSShowNonLocalizedStrings 1 • -AppleLanguages (es
de) Technical Note TN2239 iOS Debugging Magic @_Caro _N, 22/3/2015
Debugging tools @_Caro _N, 22/3/2015
Charles • Debug http/https requests • Throttle traffic • Record
download statistics @_Caro _N, 22/3/2015
Swift REPL • Test and interact with your app •
Add new code • Clean slate xcrun swift in the terminal @_Caro _N, 22/3/2015
Activity Tracing Trace crashes in asynchonous code os_activity_t activity =
os_activity_start("activity name", OS_ACTIVITY_FLAG_DEFAULT); // [...] os_activity_set_breadcrumb("event description"); // [...] os_trace("Received %d creates, %d updates, %d deletes", created, updated, deleted); // [...] os_activity_end(activity); @_Caro _N, 22/3/2015
Activity Tracing @_Caro _N, 22/3/2015
Activity Tracing http://www.objc.io/issue-19/activity-tracing.html @_Caro _N, 22/3/2015
Summary • expression -l objc -O -- (id) 0x00007fbaa1f24910 •
Edit Breakpoints, add symbolic and exception breakpoints • Tackle incomprehensive compiler errors • Launch arguments • Charles, REPL, Activity tracing @_Caro _N, 22/3/2015
Thanks @_Caro _N, 22/3/2015