What s New in LLDB. Debug your way to fame and glory #WWDC15. Developer Tools. Session 402
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1 Developer Tools #WWDC15 What s New in LLDB Debug your way to fame and glory Session 402 Kate Stone Software Behavioralist Sean Callanan Master of Expressions Enrico Granata Data Wizard 2015 Apple Inc. All rights reserved. Redistribution or public display not permitted without written permission from Apple.
2 The Year s Highlights Changes big and small
3 Since WWDC 2014
4 Since WWDC 2014 Shipped Swift debugger
5 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL
6 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise
7 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements
8 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types show inherited Objective-C fields
9 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types Help includes command aliases
10 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types help Help includes command aliases
11 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types help Help includes command aliases
12 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types help Help includes command aliases expression -O --
13 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types help Help includes command aliases expression -O -- po
14 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types help Help includes command aliases Improved data formatting expression -O -- po
15 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types help Help includes command aliases Improved data formatting expression -O -- po - Set<T>, NSIndexPath
16 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types help Help includes command aliases Improved data formatting expression -O -- po - Set<T>, NSIndexPath printf() prototype for expressions
17 Since WWDC 2014 Shipped Swift debugger Shipped Swift REPL LLDB in disguise Numerous improvements Swift types help Help includes command aliases Improved data formatting expression -O -- po - Set<T>, NSIndexPath printf() prototype for expressions Improved disassembly
18 Recent Breakpoint Enhancements Named breakpoints Multiple non-unique names allowed Other breakpoint commands take names
19 Recent Breakpoint Enhancements Named breakpoints breakpoint set -N name Multiple non-unique names allowed Other breakpoint commands take names
20 Recent Breakpoint Enhancements Named breakpoints breakpoint set -N name Multiple non-unique names allowed Other breakpoint commands take names breakpoint enable name breakpoint disable name breakpoint delete name
21 Recent Breakpoint Enhancements Named breakpoints breakpoint set -N name Multiple non-unique names allowed Other breakpoint commands take names breakpoint enable name Breakpoints in ~/.lldbinit Create default breakpoints when LLDB starts Inherited by all debug targets breakpoint disable name breakpoint delete name
22 Recent Breakpoint Enhancements Named breakpoints breakpoint set -N name Multiple non-unique names allowed Other breakpoint commands take names breakpoint enable name Breakpoints in ~/.lldbinit Create default breakpoints when LLDB starts Inherited by all debug targets breakpoint disable name breakpoint delete name breakpoint set -n malloc -N memory breakpoint set -n free -N memory breakpoint disable memory
23 Xcode 7
24 Xcode 7 Improvements in expression evaluation Swift 2 support Objective-C module support
25 Xcode 7 Improvements in expression evaluation Swift 2 support Objective-C module support Improved data formatters Vector types in Objective-C and Swift Custom data formatters written in Swift
26 Xcode 7 Improvements in expression evaluation Swift 2 support Objective-C module support Improved data formatters Vector types in Objective-C and Swift Custom data formatters written in Swift Address Sanitizer integration
27 Xcode 7 Improvements in expression evaluation memory history Swift 2 support Objective-C module support memory read Improved data formatters Vector types in Objective-C and Swift Custom data formatters written in Swift memory write memory find Address Sanitizer integration
28 Xcode 7 Improvements in expression evaluation memory history Swift 2 support Objective-C module support memory read Improved data formatters Vector types in Objective-C and Swift Custom data formatters written in Swift memory write memory find Address Sanitizer integration Type lookup command Built-in type documentation
29 Type Lookup
30 Type Lookup (lldb)
31 Type Lookup (lldb) type lookup ErrorType protocol ErrorType { var _domain: Swift.String { get } var _code: Swift.Int { get } } (lldb)
32 Type Lookup (lldb) type lookup ErrorType protocol ErrorType { var _domain: Swift.String { get } var _code: Swift.Int { get } } (lldb) type lookup Comparable protocol Comparable : _Comparable, Equatable { func <=(lhs: Self, rhs: Self) -> Swift.Bool func >=(lhs: Self, rhs: Self) -> Swift.Bool func >(lhs: Self, rhs: Self) -> Swift.Bool }
33 Type Lookup (lldb) type lookup ErrorType protocol ErrorType { var _domain: Swift.String { get } type lookup var _code: Swift.Int { get } } (lldb) type lookup Comparable protocol Comparable : _Comparable, Equatable { func <=(lhs: Self, rhs: Self) -> Swift.Bool func >=(lhs: Self, rhs: Self) -> Swift.Bool func >(lhs: Self, rhs: Self) -> Swift.Bool }
34 Compilers in LLDB Making Swift and Objective-C better and easier to debug
35 Overview Objective-C expression improvements Swift error-handling support
36 Overview Objective-C expression improvements Swift error-handling support
37 Objective-C and Swift in LLDB Obj-C
38 Objective-C and Swift in LLDB Obj-C
39 Objective-C and Swift in LLDB Obj-C
40 Objective-C and Swift in LLDB Obj-C
41 How Swift Works in LLDB (lldb)
42 How Swift Works in LLDB (lldb) p for i in (0..<5) { print(i) }
43 How Swift Works in LLDB (lldb) p for i in (0..<5) { print(i) } expression -- p
44 How Swift Works in LLDB (lldb) p for i in (0..<5) { print(i) } expression -- p
45 How Swift Works in LLDB LLDB Your Program (lldb) p for i in (0..<5) { print(i) } expression -- p
46 How Swift Works in LLDB Swift LLDB Your Program (lldb) p for i in (0..<5) { print(i) } expression -- p
47 How Swift Works in LLDB Swift LLDB Added Code Your Program (lldb) p for i in (0..<5) { print(i) } expression -- p
48 How Swift Works with Your Variables Swift LLDB Added Code Your Program (lldb)
49 How Swift Works with Your Variables Swift LLDB Added Code Your Program (lldb) p for i in (0..<3) { print(names[i]) }
50 How Swift Works with Your Variables Swift LLDB Added Code Your Program (lldb) p for i in (0..<3) { print(names[i]) } Kate Sean Enrico
51 How Swift Works with Your Variables Swift Added Code Data LLDB Your Program (lldb) p for i in (0..<3) { print( names[i]) } Kate Sean Enrico
52 How Swift Works with the SDK Swift Added Code Data LLDB Your Program (lldb)
53 How Swift Works with the SDK Swift Added Code Data LLDB Your Program (lldb) p NSApplication.sharedApplication()
54 How Swift Works with the SDK Swift Added Code Data LLDB Your Program (lldb) p NSApplication.sharedApplication() (NSApplication) $R1 = 0x { AppKit.NSResponder = { NSObject = { isa = NSApplication } _nextresponder = nil } }
55 How Swift Works with the SDK Swift Added Code Data LLDB Your Program SDK Module (lldb) p NSApplication.sharedApplication() (NSApplication) $R1 = 0x { AppKit.NSResponder = { NSObject = { isa = NSApplication } _nextresponder = nil } }
56 How Swift Works with the SDK Swift Added Code Data Class LLDB Your Program SDK Module (lldb) p NSApplication.sharedApplication() (NSApplication) $R1 = 0x { AppKit.NSResponder = { NSObject = { isa = NSApplication } _nextresponder = nil } }
57 It s All Automatic!
58 It s All Automatic! in Swift
59 Let s Try the Same Thing in Objective-C! (lldb)
60 Let s Try the Same Thing in Objective-C! (lldb) p NSLog(@ %d, i)
61 Let s Try the Same Thing in Objective-C! (lldb) p NSLog(@ %d, i) error: 'NSLog' has unknown return type; cast the call to its declared return type error: 1 errors parsing expression
62 Let s Try the Same Thing in Objective-C! (lldb) p NSLog(@ %d, i) error: 'NSLog' has unknown return type; cast the call to its declared return type error: 1 errors parsing expression How it s defined What LLDB sees void NSLog(NSString *format,...)??? NSLog(...)
63 Let s Try the Same Thing in Objective-C! (lldb) p NSLog(@ %d, i) :50: DemoApp[58380: ] 0
64 Let s Try the Same Thing in Objective-C! (lldb)
65 Let s Try the Same Thing in Objective-C! (lldb) p NSMakeRect(0, 0, 10, 10)
66 Let s Try the Same Thing in Objective-C! (lldb) p NSMakeRect(0, 0, 10, 10) error: use of undeclared identifier NSMakeRect error: 1 errors parsing expression
67 Let s Try the Same Thing in Objective-C! (lldb) p NSMakeRect(0, 0, 10, 10) error: use of undeclared identifier NSMakeRect error: 1 errors parsing expression NS_INLINE NSRect NSMakeRect( How it s defined CGFloat, CGFloat, CGFloat, CGFloat) What LLDB sees
68 Let s Try the Same Thing in Objective-C! (lldb) p NSMakeRect(0, 0, 10, 10) (NSRect) $0 = (origin = (x = 0, y = 0), size = (width = 10, height = 10))
69 Let s Try the Same Thing in Objective-C! (lldb)
70 Let s Try the Same Thing in Objective-C! (lldb) p [NSApplication sharedapplication].undomanager
71 Let s Try the Same Thing in Objective-C! (lldb) p [NSApplication sharedapplication].undomanager error: property undomanager not found on object of type id error: 1 errors parsing expression
72 Let s Try the Same Thing in Objective-C! (lldb) p [NSApplication sharedapplication].undomanager error: property undomanager not found on object of type id error: 1 errors parsing expression How it s defined What LLDB sees -(NSApplication*)sharedApplication -(id)sharedapplication
73 Let s Try the Same Thing in Objective-C! (lldb) p [NSApplication sharedapplication].undomanager (NSUndoManager * nullable) $1 = nil
74 The Information Is Right There!
75 The Information Is Right There! Your Code names, MyFunc(), MyView
76 The Information Is Right There! Your Code names, MyFunc(), MyView SDK Functions NSLog, NSMakeRect
77 The Information Is Right There! Your Code names, MyFunc(), MyView SDK Functions NSLog, NSMakeRect SDK Classes NSView, NSApplication *
78 The Information Is Right There! Your Code names, MyFunc(), MyView SDK Functions NSLog, NSMakeRect SDK Classes NSView, NSApplication * SDK Constants NSASCIIStringEncoding
79 The Information Is Right There! Your Code names, MyFunc(), MyView SDK Functions NSLog, NSMakeRect SDK Classes NSView, NSApplication * SDK Constants NSASCIIStringEncoding Macros INT_MAX, MAX()
80 The Information Is Right There! Your Code names, MyFunc(), MyView SDK Functions NSLog, NSMakeRect SDK Classes NSView, NSApplication * SDK Constants NSASCIIStringEncoding Macros INT_MAX, MAX()
81 The Information Is Right There! Your Code names, MyFunc(), MyView SDK Functions NSLog, NSMakeRect SDK Classes NSView, NSApplication SDK Constants NSASCIIStringEncoding Macros INT_MAX, MAX()
82 AppKit
83 UIKit
84 Overview Objective-C expression improvements Swift error-handling support
85 Handling Errors in Swift Expressions
86 Handling Errors in Swift Expressions Expressions can handle Swift errors
87 Handling Errors in Swift Expressions Expressions can handle Swift errors No need to try in LLDB
88 Handling Errors in Swift Expressions Expressions can handle Swift errors No need to try in LLDB (lldb)
89 Handling Errors in Swift Expressions Expressions can handle Swift errors No need to try in LLDB (lldb) expr ThisFunctionThrows()
90 Handling Errors in Swift Expressions Expressions can handle Swift errors No need to try in LLDB (lldb) expr ThisFunctionThrows() (a.enumerror) $E0 = SeriousError
91 Handling Errors in Swift Expressions Expressions can handle Swift errors No need to try in LLDB (lldb) expr ThisFunctionThrows() (a.enumerror) $E0 = SeriousError Works in the REPL, too!
92 Handling Errors in Swift Expressions Expressions can handle Swift errors No need to try in LLDB (lldb) expr ThisFunctionThrows() (a.enumerror) $E0 = SeriousError Works in the REPL, too! 1>
93 Handling Errors in Swift Expressions Expressions can handle Swift errors No need to try in LLDB (lldb) expr ThisFunctionThrows() (a.enumerror) $E0 = SeriousError Works in the REPL, too! 1> ThisFunctionThrows()
94 Handling Errors in Swift Expressions Expressions can handle Swift errors No need to try in LLDB (lldb) expr ThisFunctionThrows() (a.enumerror) $E0 = SeriousError Works in the REPL, too! 1> ThisFunctionThrows() $E0: EnumError = MyError
95 Stopping When Swift Errors Occur
96 Stopping When Swift Errors Occur Use breakpoints
97 Stopping When Swift Errors Occur Use breakpoints On Objective-C exceptions
98 Stopping When Swift Errors Occur Use breakpoints On Objective-C exceptions (lldb)
99 Stopping When Swift Errors Occur Use breakpoints On Objective-C exceptions (lldb) br s -E objc
100 Stopping When Swift Errors Occur Use breakpoints On Objective-C exceptions breakpoint set -E language (lldb) br s -E objc
101 Stopping When Swift Errors Occur Use breakpoints On Objective-C exceptions breakpoint set -E language (lldb) br s -E objc Breakpoint 1: where = libobjc.a.dylib`objc_exception_throw, address = 0x00007fff9046bd18
102 Stopping When Swift Errors Occur Use breakpoints On Objective-C exceptions breakpoint set -E language (lldb) br s -E objc Breakpoint 1: where = libobjc.a.dylib`objc_exception_throw, address = 0x00007fff9046bd18 On Swift errors
103 Stopping When Swift Errors Occur Use breakpoints On Objective-C exceptions breakpoint set -E language (lldb) br s -E objc Breakpoint 1: where = libobjc.a.dylib`objc_exception_throw, address = 0x00007fff9046bd18 On Swift errors (lldb)
104 Stopping When Swift Errors Occur Use breakpoints On Objective-C exceptions breakpoint set -E language (lldb) br s -E objc Breakpoint 1: where = libobjc.a.dylib`objc_exception_throw, address = 0x00007fff9046bd18 On Swift errors (lldb) br s -E swift
105 Stopping When Swift Errors Occur Use breakpoints On Objective-C exceptions breakpoint set -E language (lldb) br s -E objc Breakpoint 1: where = libobjc.a.dylib`objc_exception_throw, address = 0x00007fff9046bd18 On Swift errors (lldb) br s -E swift Breakpoint 1: where = libswiftcore.dylib`swift_willthrow, address = 0x f71e0
106 Stopping on Specific Errors
107 Stopping on Specific Errors Supported for Swift
108 Stopping on Specific Errors Supported for Swift (lldb)
109 Stopping on Specific Errors Supported for Swift (lldb) br s -E swift -O EnumError Breakpoint 1: where = libswiftcore.dylib`swift_willthrow, (lldb) address = 0x f71e0
110 Stopping on Specific Errors Supported for Swift (lldb) br s -E swift -O EnumError Breakpoint 1: where = libswiftcore.dylib`swift_willthrow, (lldb) address = 0x f71e0 breakpoint set -E language -O type-name
111 Stopping on Specific Errors Supported for Swift (lldb) br s -E swift -O EnumError Breakpoint 1: where = libswiftcore.dylib`swift_willthrow, (lldb) address = 0x f71e0 continue 25 if input > { -> 27 throw EnumError.ImportantError 28 } 29 else if input > { breakpoint set -E language -O type-name
112 Of Course, You Can Still Catch Them 1>
113 Of Course, You Can Still Catch Them 1> import Foundation 2>
114 Of Course, You Can Still Catch Them 1> import Foundation 2> do { throw NSError(domain: My domain, code: 0, userinfo:nil) } catch let x { print(x) }
115 Of Course, You Can Still Catch Them 1> import Foundation 2> do { throw NSError(domain: My domain, code: 0, userinfo:nil) } catch let x { print(x) } Error Domain=My domain Code=0 The operation couldn t be completed. (My domain error 0.)
116 Presentation Is Everything Formatted data is comprehended data
117 Examining Data
118 Examining Data frame variable
119 Examining Data frame variable expression --
120 Examining Data frame variable expression -- p
121 Examining Data frame variable expression -- p expression -O --
122 Examining Data frame variable expression -- p expression -O -- po
123 The Frame Variable Command
124 The Frame Variable Command frame variable
125 The Frame Variable Command (lldb) frame variable (Int, String) mytuple = (0 = 12, 1 = Hello World ) (Int) theyear = 1984 frame variable
126 The Frame Variable Command (lldb) frame variable (Int, String) mytuple = (0 = 12, 1 = Hello World ) (Int) theyear = 1984 (lldb) frame variable theyear (Int) theyear = 1984 frame variable
127 The Frame Variable Command (lldb) frame variable (Int, String) mytuple = (0 = 12, 1 = Hello World ) (Int) theyear = 1984 (lldb) frame variable theyear (Int) theyear = 1984 frame variable (lldb) frame variable -format hex theyear (Int) theyear = 0x c0
128 The Frame Variable Command (lldb) frame variable (Int, String) mytuple = (0 = 12, 1 = Hello World ) (Int) theyear = 1984 children (lldb) frame variable theyear (Int) theyear = 1984 frame variable (lldb) frame variable -format hex theyear (Int) theyear = 0x c0
129 The Expression Command
130 The Expression Command expression -- p
131 The Expression Command (lldb) p theyear + 1 (Int) $R0 = 1985 expression -- p
132 The Expression Command (lldb) p theyear + 1 (Int) $R0 = 1985 (lldb) p String($R0 + 1) (String) $R1 = 1986 expression -- p
133 The Expression Command (lldb) p theyear + 1 (Int) $R0 = 1985 (lldb) p String($R0 + 1) (String) $R1 = 1986 expression -- p (lldb) expr -format hex - [1,2,3] ([Int]) $R0 = 3 values { [0] = 0x [1] = 0x [2] = 0x }
134 The Expression Command (lldb) p theyear + 1 (Int) $R0 = 1985 (lldb) p String($R0 + 1) (String) $R1 = 1986 expression -- p (lldb) expr -format hex - [1,2,3] ([Int]) $R0 = 3 values { [0] = 0x [1] = 0x [2] = 0x } children
135 The po Command
136 The po Command expression -O -- po
137 The po Command (lldb) po [[MyView alloc] initwithframe: myframe] <MyView: 0x > expression -O -- po
138 The po Command (lldb) po [[MyView alloc] initwithframe: myframe] <MyView: 0x > < NSArrayI 0x10050b2a0>( 1, 2, 3 ) expression -O -- po
139 The po Command (lldb) po [[MyView alloc] initwithframe: myframe] <MyView: 0x > < NSArrayI 0x10050b2a0>( 1, 2, 3 ) expression -O -- po (lldb) Hello World Hello World
140 Formatting Models
141 Formatting Models frame variable expression -- p expression -O -- po does not run code runs your code runs your code uses LLDB formatters uses LLDB formatters + code to format object
142 Formatting Models frame variable expression -- p expression -O -- po does not run code runs your code runs your code uses LLDB formatters uses LLDB formatters + code to format object
143 Formatting Models frame variable expression -- p expression -O -- po does not run code runs your code runs your code uses LLDB formatters uses LLDB formatters + code to format object
144 Formatting Models
145 Formatting Models Out-of-process formatting Data and formatter are separate Easy access to debugger s object model Easier to keep program state intact
146 Formatting Models Out-of-process formatting Data and formatter are separate Easy access to debugger s object model Easier to keep program state intact In-process formatting Data and formatter live together Easy access to your object model Care required to keep program state intact
147 In-Process Swift Formatting
148 In-Process Swift Formatting Powers playgrounds since day one
149 In-Process Swift Formatting Powers playgrounds since day one Now Public API Also powers LLDB po command
150 In-Process Swift Formatting
151 In-Process Swift Formatting Four Swift protocols
152 In-Process Swift Formatting Four Swift protocols CustomStringConvertible CustomDebugStringConvertible CustomPlaygroundQuickLookable CustomReflectable
153 In-Process Swift Formatting Four Swift protocols CustomStringConvertible CustomDebugStringConvertible CustomPlaygroundQuickLookable CustomReflectable Partial opt-in possible
154 CustomStringConvertible String representation of the object Used by the print() function, and string interpolation
155 CustomStringConvertible String representation of the object Used by the print() function, and string interpolation struct BottlesOfBeer : CustomStringConvertible { var Count: Int var description: String { return \(Count) bottles of beer on the wall } }
156 CustomDebugStringConvertible Debugger-specific String representation of the object Used by debugprint() (and print() if necessary)
157 CustomDebugStringConvertible Debugger-specific String representation of the object Used by debugprint() (and print() if necessary) extension BottlesOfBeer : CustomDebugStringConvertible { var debugdescription: String { return \(Count) bottles of stout on the wall. } }
158 CustomPlaygroundQuickLookable Graphical representation for display in playgrounds
159 CustomPlaygroundQuickLookable
160 CustomReflectable
161 CustomReflectable Allows vending an entirely custom children hierarchy
162 CustomReflectable Allows vending an entirely custom children hierarchy Returns a Mirror for an object Representation of an object s structure
163 Temperature Data
164 Temperature Data struct Timestamp { var Hour: Int var Minute: Int } struct TemperatureData { var Time: Timestamp var Temperature: Float }
165 Temperature Data struct Timestamp { var Hour: Int var Minute: Int } struct TemperatureData { var Time: Timestamp var Temperature: Float } let Temps = [ TemperatureData(Time: Timestamp(Hour: 6, Minute: 30), Temperature: 10), TemperatureData(Time: Timestamp(Hour: 18, Minute: 30), Temperature: 34) ]
166 Temperature Data
167 Temperature Data (lldb) po Temps
168 Temperature Data (lldb) po Temps 2 elements [0] : TemperatureData Time : Timestamp - Hour : 6 - Minute : 30 - Temperature : 10 [1] : TemperatureData Time : Timestamp - Hour : 18 - Minute : 30 - Temperature : 34
169 Temperature Data (lldb) po Temps 2 elements [0] : TemperatureData Time : Timestamp - Hour : 6 - Minute : 30 - Temperature : 10 [1] : TemperatureData Time : Timestamp - Hour : 18 - Minute : 30 - Temperature : 34 Time on one line, AM/PM format
170 Temperature Data (lldb) po Temps 2 elements [0] : TemperatureData Time : Timestamp - Hour : 6 - Minute : 30 - Temperature : 10 [1] : TemperatureData Time : Timestamp - Hour : 18 - Minute : 30 - Temperature : 34 Temperature in F Time on one line, AM/PM format
171 Step 1: Time on One Line
172 Step 1: Time on One Line extension Timestamp : CustomStringConvertible { var description: String { let formatter = NSDateFormatter() formatter.datestyle = NSDateFormatterStyle.NoStyle formatter.timestyle = NSDateFormatterStyle.ShortStyle formatter.timezone = NSTimeZone(forSecondsFromGMT: 0) let date = NSDate(timeIntervalSince1970: NSTimeInterval(60 * (Minute + (60*Hour)))) return formatter.stringfromdate(date) } }
173 Step 2: Fahrenheit Degrees
174 Step 2: Fahrenheit Degrees extension TemperatureData : CustomReflectable { func custommirror() -> Mirror { return Mirror(self, children: [ Time : \(Time), Temp C : Temperature, Temp F : 1.8*Temperature+32 } } ])
175 Step 2: Fahrenheit Degrees extension TemperatureData : CustomReflectable { func custommirror() -> Mirror { return Mirror(self, children: [ Time : \(Time), CustomStringConvertible from previous slide Temp C : Temperature, Temp F : 1.8*Temperature+32 } } ])
176 Temperature Data
177 Temperature Data (lldb) po Temps
178 Temperature Data (lldb) po Temps 2 elements [0] : TemperatureData - Time : 6:30 AM - Temp C : 10 - Temp F : 50 [1] : TemperatureData - Time : 6:30 PM - Temp C : 34 - Temp F : 93.2
179 Temperature Data (lldb) po Temps 2 elements [0] : TemperatureData - Time : 6:30 AM - Temp C : 10 - Temp F : 50 [1] : TemperatureData - Time : 6:30 PM - Temp C : 34 - Temp F : 93.2 That s hot!
180 At Runtime Too! Conformances can also be added while debugging
181 At Runtime Too! Conformances can also be added while debugging but not changed
182 At Runtime Too! Conformances can also be added while debugging but not changed They can also be added in the REPL
183 And in Playgrounds!
184 And in Playgrounds!
185 Summary
186 Summary More information available more often
187 Summary More information available more often Objective-C runtime
188 Summary More information available more often Objective-C runtime SDK modules
189 Summary More information available more often Objective-C runtime SDK modules In-process formatting
190 More Information LLDB Documentation Swift Language Documentation Apple Developer Forums Stefan Lesser Developer Tools Evangelist
191 Related Sessions Authoring Rich Playgrounds Presidio Wednesday 10:00AM Advanced Debugging and the Address Sanitizer Mission Friday 9:00AM
192
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