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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab

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• ( ) • " •

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? • Build • Build ! • ઁ؀۽ উؽ ݻ઴ Ҋஜ ࠽٘೧ࠆ !

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LLVM? LLDB?

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LLVM? • Low Level Virtual Machine , • Compiler Toolchain • Chris Lattner • Apple Compiler • , • LLVM Core, Clang, LLDB, libc++, compiler-rt ..

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LLVM? Front-end Optimizer Code Generator IR: Intermediate Representation Source Code Machine Code IR Objective-C: Clang Swift: Swiftc

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LLDB? • LLVM Debugger Component • C, C++, Objective-C, Swift • Xcode Debugger • LLVM • Clang Expression Parser, LLVM Disassembler

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Beyond “PO” LLDB

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint command apropo alias ivars type lookup sys frame variable image list pprotocol tv help keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint command apropo alias ivars type lookup sys frame variable image list pprotocol tv help keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab ? (lldb) help breakpoint (lldb) help breakpoint read

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watchpoint po breakpoint command apropo alias ivars type lookup sys frame variable image list pprotocol tv help keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab ? (lldb) apropo “reference count” The following commands may relate to 'reference count': refcount -- Inspect the reference count data for a Swift object

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Xcode IDE

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Breakpoint Custom Action ?

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Breakpoint Option Condition ݅઒ೡ ٸ݅ Break ౠ੿ പࣻ݅ఀ ޖद Action ࣻ೯ റ ೐۽Ӓ۔ ҅ࣘ प೯

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Custom Action

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Sharing git

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Swift Error Breakpoint

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Swift Error Breakpoint Swift Error Throw - Error Type

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Exception Breakpoint

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Exception Breakpoint Exception - Action po $arg1

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Symbolic Breakpoint

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Symbolic Breakpoint Break Symbol, Module

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Symbolic Breakpoint Constraint Conflict : UIViewAlertForUnsatisfiableConstraints 


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Symbolic Breakpoint Collection View Flow Layout Issue: UICollectionViewFlowLayoutBreakForInvalidSizes

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watchpoint po breakpoint help command alias ivars apropo type lookup sbt frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint help command alias ivars apropo type lookup sbt frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Breakpoint , Memory Read/Write Break Code

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Set (lldb) watchpoint set variable -w write user (lldb) w s v self Watchpoint created: Watchpoint 1: addr = 0x7 ee400b168 size = 8 state = enabled type = w declare @ ‘/Users/gaeun/ /ViewController.swift:25’ watchpoint spec = ‘user' new value: 0x00007 ba1506390 - ੌ߈੸ਵ۽ ୭؀ 4ѐө૑ ࢤࢿоמ - 8byteࠁ׮ ੘ইঠ Watch оמ

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Current watchpoints: Watchpoint 1: addr = 0x7 ee400b168 size = 8 state = enabled type = w declare @ ‘/Users/gaeun/ /DebuggingTest/ViewController.swift:25' watchpoint spec = 'self' new value: 0x00007 ba1506390 List (lldb) watchpoint list (lldb) w l

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab (lldb) watchpoint command add 1 Delete (lldb) watchpoint delete 1 1 watchpoints deleted Command प೯ೡ Command ୶оೞӝ

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Break Command • Backtrace • “bactrace ended”

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint help command alias ivars apropo type lookup sbt frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab (lldb) language swift refcount self (lldb) la s refcount self 
 refcount data: (strong = 1, unowned = 0, weak = 0) Swiftীࢲ݅ ࢎਊоמೠ ݺ۸য

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Module • Module : 
 Code / Plugin / Framework Dynamic Library Image Commandח “target modules”੄ SubCommand۽

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab • Module Symbol 
 • Private 
 Framework 
 Class, Method • Crash Report 
 Backtrace Symbolicating

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Dependency Module • UUID • Memory Address • Path

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. . .

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Module Symbol (lldb) image dump symtab Alamo re -s adress • Alamo re Symbol

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Symbol Filtering • UINavigationBar “set ” Method 
 (lldb) image lookup -rn ‘\[UINavigationBar\ set\’ 


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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Crash Log Backtrace Symbolicating Last Exception Backtrace: 0 CoreFoundation 0x000000018708b100 0x186f80000 + 1093888 1 libobjc.A.dylib 0x00000001939441fc 0x19393c000 + 33276 2 CoreFoundation 0x000000018708b040 0x186f80000 + 1093696 3 ExampleApp 0x000000010003acc4 0x10002c000 + 60612 StackAddress LoadAddress Offset SlideValue : 32-bitח 0x4000, 64-bitח 0x100000000 FileAddress = StackAddress - LoadAddress + Slide = O set + Slide

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab Crash Log Backtrace Symbolicating (lldb) target create --arch arm64 ExampleApp.dSYM Current executable set to ExampleApp.dSYM' (arm64). (lldb) image lookup --address 0x10000ECC4 Address: ExampleApp.dSYM[0x000000010000ecc4] (ExampleApp.dSYM.__TEXT.__text + 29916) Summary: ExampleApp.dSYM`-[ExampleClass buggyFunction] + 68 at ExampleClass.m:181

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab UI Debugging

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View Hierarchy AutoLayout Trace (lldb) po [[UIWindow keyWindow] _autolayoutTrace]

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ViewController Hierarchy (lldb) po [UIViewController _printHierarchy]

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watchpoint po breakpoint help command alias ivars apropo type lookup sbt frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup continue next rbreak image dump symtab (lldb) command alias pojc expr -l objc++ -O -- (lldb) command alias “ ”

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watchpoint po breakpoint help command alias ivars apropo type lookup sbt frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup continue next rbreak image dump symtab Command , ~/.lldbinit • Custom Command Alias • LLDB Script • Chisel (Facebook)
 https://github.com/facebook/chisel • DerekSelander
 https://github.com/DerekSelander/LLDB

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watchpoint po breakpoint help command alias ivars apropo type lookup sbt frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup continue next rbreak image dump symtab Derek Selander https://github.com/DerekSelander/LLDB

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watchpoint breakpoint help command alias ivars apropo type lookup sbt frame variable image list next pprotocol keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup tv continue rbreak image dump symtab

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list next pprotocol keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup tv continue rbreak image dump symtab Protocol Required/Optional Method (Objective-C Only)

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watchpoint breakpoint help command alias ivars apropo type lookup sbt frame variable image list next pprotocol keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup tv continue rbreak image dump symtab Backtrace Symbolicating (Objective-C Symbol only)

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watchpoint po breakpoint help command alias ivars apropo type lookup sbt frame variable image list next pprotocol keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup tv continue rbreak image dump symtab Keychain DataBase

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list next pprotocol keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup tv continue rbreak image dump symtab View isHidden Toggle

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watchpoint po breakpoint help command alias ivars apropo type lookup sbt frame variable image list pprotocol tv keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup continue next rbreak image dump symtab

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list next pprotocol keychain p backtrace jump expression refcount thread info step register read /.lldbinit image lookup tv continue rbreak image dump symtab Reference

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list next pprotocol keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup tv continue rbreak image dump symtab #WWDC16 Debugging Tips and Tricks #WWDC18 Advanced Debugging with Xcode and LLDB Advanced Apple Debugging & Reverse Engineering https://llvm.org/ https://github.com/DerekSelander/LLDB

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watchpoint po breakpoint help command alias ivars apropo type lookup sys frame variable image list next pprotocol keychain p backtrace jump expression refcount thread info step register read ./lldbinit image lookup tv continue rbreak image dump symtab