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These are confidential sessions—please refrain from streaming, blogging, or taking pictures Session 412 Debugging in Xcode Ken Orr Xcode Debugger UI Manager

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Control Flow Correctness

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Breakpoints Variables

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Breakpoints and Breakpoint Actions

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NSLog(@"%ld", foo);

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Creating and Deleting Breakpoints

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Creating and Deleting Breakpoints

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Creating and Deleting Breakpoints ⌘\ Add Or Remove Breakpoint At Current Line

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Creating and Deleting Breakpoints

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Managing Your Breakpoints

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Managing Your Breakpoints

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Managing Your Breakpoints ⌘6 Breakpoint Navigator

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Managing Your Breakpoints

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Managing Your Breakpoints Change a Breakpoint Group Control-click a breakpoint to move it to a different group

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Managing Your Breakpoints

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Managing Your Breakpoints Project Breakpoint Group Contains breakpoints that belong to the listed project

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Managing Your Breakpoints Project Breakpoint Group Contains breakpoints that belong to the listed project

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Managing Your Breakpoints

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Managing Your Breakpoints Shared Breakpoint Group Shared breakpoints are available to all users who open the project

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Managing Your Breakpoints

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Managing Your Breakpoints

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Managing Your Breakpoints User Breakpoint Group User breakpoints are available from all of your projects and workspaces

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Exception and Symbolic Breakpoints

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Exception and Symbolic Breakpoints Add Breakpoint Allows you to add an exception or symbolic breakpoint

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Exception and Symbolic Breakpoints Add Breakpoint Allows you to add an exception or symbolic breakpoint

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Exception and Symbolic Breakpoints

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Exception and Symbolic Breakpoints Type of Exception Breakpoint Allows you to stop on all exceptions, Objective-C exceptions, or C++ exceptions

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Exception and Symbolic Breakpoints When to Break Allows you to specify whether you want to break on catch or throw

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Exception and Symbolic Breakpoints

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Exception and Symbolic Breakpoints Symbol Name Execution will pause when a symbol with this name is called

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Exception and Symbolic Breakpoints Module Name Lets you restrict what libraries with the specified symbol name should result in a pause

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Editing Breakpoints

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Editing Breakpoints Edit Breakpoint ⌥⌘

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Editing Breakpoints Condition to Evaluate An expression to evaluate in order to determine if the breakpoint should be stopped at

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Editing Breakpoints Ignore Count The number of times to ignore the breakpoint before stopping

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Editing Breakpoints Automatically Continue Continues program execution after all of the breakpoint’s actions have completed

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Breakpoint Actions

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Breakpoint Actions

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Breakpoint Actions

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Breakpoint Actions

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Breakpoint Actions

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Debugger Command Breakpoint Action

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Debugger Command Breakpoint Action po myVariable

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Debugger Command Breakpoint Action po myVariable expr (void)NSLog(@“%f“, myVariable)

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Debugger Command Breakpoint Action po myVariable breakpoint set -f SKTWindowController.m -l 100 expr (void)NSLog(@“%f“, myVariable)

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Log Message Breakpoint Action

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Log Message Breakpoint Action myVariable = @myVariable@, hit %H times

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Shell Command Breakpoint Action

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Shell Command Breakpoint Action screencapture Command: /tmp/screenShot.png Arguments:

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Sound Breakpoint Action

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Sound Breakpoint Action ~/Library/Sounds Sounds put in your home directory show up in Xcode

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AppleScript Breakpoint Action

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AppleScript Breakpoint Action tell application "Mail" set myMessage to make new outgoing message with properties {visible:false, subject:"Test Failed", content:"The test failed"} tell myMessage make new to recipient at end of to recipients with properties {name:"Ken Orr", address:"[email protected]"} myMessage send end tell end tell

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Demo Breakpoints and breakpoint actions Alex Raftis Xcode Debugger UI Engineer

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The Variables View

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Viewing Your Variables

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Viewing Your Variables

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Viewing Your Variables Viewing Mode Auto - variables around the line of code you’re paused at Local - all variables in local scope All - all variables including globals and registers

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Viewing Your Variables Variable Kind Local Variable Argument Static Variable Global Variable Register Instance Variable Expression

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Viewing Your Variables Variable Name The name of the variable as it appears in your code

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Viewing Your Variables Dynamic Type Runtime type of the variable

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Viewing Your Variables Variable Value Current value of the variable

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Viewing Your Variables Variable Summary Summary for the variable, if there is one

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Return Value When Stepping Out - (void)updateLabel { [_textField setStringValue:[self currentProcessNameString]]; } - (NSString *)currentProcessNameString { return [NSString stringWithFormat:@"Current process is %@", [[NSProcessInfo processInfo] processName]]; }

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Return Value When Stepping Out - (void)updateLabel { [_textField setStringValue:[self currentProcessNameString]]; } - (NSString *)currentProcessNameString { return [NSString stringWithFormat:@"Current process is %@", [[NSProcessInfo processInfo] processName]]; }

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Return Value When Stepping Out - (void)updateLabel { [_textField setStringValue:[self currentProcessNameString]]; } - (NSString *)currentProcessNameString { return [NSString stringWithFormat:@"Current process is %@", [[NSProcessInfo processInfo] processName]]; } return [NSString stringWithFormat:@"Current process is %@", [[NSProcessInfo processInfo] processName]];

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Return Value When Stepping Out - (void)updateLabel { [_textField setStringValue:[self currentProcessNameString]]; } - (NSString *)currentProcessNameString { return [NSString stringWithFormat:@"Current process is %@", [[NSProcessInfo processInfo] processName]]; } return [NSString stringWithFormat:@"Current process is %@", [[NSProcessInfo processInfo] processName]];

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Return Value When Stepping Out - (void)updateLabel { [_textField setStringValue:[self currentProcessNameString]]; } - (NSString *)currentProcessNameString { return [NSString stringWithFormat:@"Current process is %@", [[NSProcessInfo processInfo] processName]]; } [_textField setStringValue:[self currentProcessNameString]];

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Return Value When Stepping Out - (void)updateLabel { [_textField setStringValue:[self currentProcessNameString]]; } - (NSString *)currentProcessNameString { return [NSString stringWithFormat:@"Current process is %@", [[NSProcessInfo processInfo] processName]]; } [_textField setStringValue:[self currentProcessNameString]];

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A Bit About Variable Summaries title = (__NSCFString *) 0x1234 @”WWDC12”

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A Bit About Variable Summaries title = (__NSCFString *) 0x1234 @”WWDC12” [title description] Previously implemented with expressions:

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A Bit About Variable Summaries NSCFString *) 0x1234 @”WWDC12” [title description] with expressions:

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A Bit About Variable Summaries

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A Bit About Variable Summaries Can change the state of your program

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A Bit About Variable Summaries Can change the state of your program May not always work

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A Bit About Variable Summaries LLDB Block of memory representing __NSCFString

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A Bit About Variable Summaries LLDB Block of memory representing __NSCFString Character Data LLDB looks inside the object and reads the memory of the specific data it wants

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Creating Custom Summaries import lldb LLDB

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Creating Custom Summaries import lldb LLDB

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Creating Custom Summaries import lldb LLDB

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Creating Custom Summaries import lldb def circle_summary(valueObject, dictionary): LLDB

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Creating Custom Summaries import lldb def circle_summary(valueObject, dictionary): # grab the bounds of the SKTCircle. bounds = valueObject.GetChildMemberWithName('_bounds') size = bounds.GetChildMemberWithName('size') … return 'Major Radius = ' + majorRadiusAsString + ', Minor Radius = ' + minorRadiusAsString + ', Area = ' + areaAsString LLDB

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Creating Custom Summaries import lldb def circle_summary(valueObject, dictionary): SBValue # grab the bounds of the SKTCircle. bounds = valueObject.GetChildMemberWithName('_bounds') size = bounds.GetChildMemberWithName('size') … return 'Major Radius = ' + majorRadiusAsString + ', Minor Radius = ' + minorRadiusAsString + ', Area = ' + areaAsString LLDB

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Creating Custom Summaries import lldb def circle_summary(valueObject, dictionary): Don’t use this parameter # grab the bounds of the SKTCircle. bounds = valueObject.GetChildMemberWithName('_bounds') size = bounds.GetChildMemberWithName('size') … return 'Major Radius = ' + majorRadiusAsString + ', Minor Radius = ' + minorRadiusAsString + ', Area = ' + areaAsString LLDB

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Creating Custom Summaries import lldb def circle_summary(valueObject, dictionary): # grab the bounds of the SKTCircle. bounds = valueObject.GetChildMemberWithName('_bounds') size = bounds.GetChildMemberWithName('size') … return 'Major Radius = ' + majorRadiusAsString + ', Minor Radius = ' + minorRadiusAsString + ', Area = ' + areaAsString LLDB

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Demo Variables view and custom LLDB summaries Troy Koelling Xcode Debugger UI Engineer

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Advanced Debugging

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Debugging as Root

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Debugging as Root Edit Scheme ⌘<

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Debugging as Root

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What Is an XPC Service Privileged Bits Your App Process App Logic Crashy Bits

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What Is an XPC Service Crashy Bits Privileged Bits Your App Process App Logic XPC Services (separate processes)

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Demo Advanced debugging Han Ming Ong Xcode Debugger UI Engineer

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More Information Michael Jurewitz Developer Tools Evangelist [email protected] Documentation LLDB Custom Summaries http://lldb.llvm.org/varformats.html Documentation LLDB Scripting http://lldb.llvm.org/scripting.html Apple Developer Forums http://devforums.apple.com

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Related Sessions Debugging with LLDB Presidio Friday 10:15AM Cocoa Interprocess Communication with XPC Russian Hill Thursday 4:30PM OpenGL ES Tools and Techniques Pacific Heights Wednesday 3:15PM Learning Instruments Presidio Wednesday 4:30PM

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Labs Xcode Lab Developer Tools Lab B Ongoing LLDB Lab Developer Tools Lab C Friday 11:30AM

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