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Khoa Pham
August 27, 2015
Programming
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420
LLDB
Tips on using LLDB
Khoa Pham
August 27, 2015
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Transcript
LLDB Khoa Pham - 2359 Media
LLDB Home page http://lldb.llvm.org/ LLDB is an open-source debugger that
features a REPL, along with C++ and Python plugins
Menu - Command - Use cases - Python - Chisel
- Standalone
Command
Command - help Information on any command help print help
thread continue help help
Command - print Print value print a print self
Command Prefix matching print, prin, pri, p expression, e Can’t
use pr (print or process?)
Command $ variable Anything starting with a dollar sign is
in LLDB’ s namespace and exists to help you print $0 + 7
Command - expression Evaluate an expression (ObjC++ or Swift) in
the current program context, Modify values in the program expression $0 = 10 e $0 = 10
Command - print 'print' is an abbreviation for 'expression --'.
Use -- to signify the end of the flags and the beginning of the input e --location -- -count
Command - print object See the description method of an
object e -O -- aString po aString
Command - variable The variable must start with a dollar
sign e NSInteger $b = 10; p $b + a
Command - flow Continue process continue, continue, c Step over
thread step-over, next, n
Command - flow Step into thread step-in, step, s Step
out thread step-out, finish
Command - thread return Executes the return command, jumping out
of the current stack frame thread return YES
Breakpoint List breakpoints br li Create breakpoints br set -f
ViewController.m 39
Use cases Find targets of a button po [self.myButton allTargets]
Use cases See the frame po self.view.frame e @import UIKit
po self.view.frame
Use cases Change background color without continue e self.view.backgroundColor =
[UIColor greenColor] e (void)[CATransaction flush]
Use cases Watch variable wivar self _number
Python LLDB has full, built-in Python support. If you type
script in LLDB, it will open a Python REPL
.lldbinit Executed every time LLDB starts command script import /path/to/fblldb.py
Chisel brew update brew install chisel # ~/.lldbinit command script
import /path/to/fblldb.py
Standalone Using LLDB as a Standalone Debugger
References - Getting Started with LLDB - Dancing in the
Debugger — A Waltz with LLDB - Video Tutorial: Using LLDB in iOS - Navigating and discovering an iOS codebase using lldb - chisel