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Debugging in Swift
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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
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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