lldb cheat sheet. Execution Commands start lld (prefix with xcrun on os x). >lldb [ ]. >lldb — arg1 load program. >file LLDB Cheat Sheet. A complete gdb to lldb command map. Print out. Print object. (lldb) po responseObject (lldb) po [responseObject [email protected]”state”]. LLDB Debugger commands. GitHub Gist: instantly share code, notes, and snippets.
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This article will showcase the end product of some of the awesome tools you can and hopefully will build in the book. Download the starter package here.
Custom LLDB Commands in Practice
LLDB will load content by searching in several predefined locations on your lldh. Use your favorite text editor and open this file. In addition, it looks for any.
llb This means the LLDB commands were not successfully installed. Make sure you have no spaces in the directories you installed the LLDB commands in or surround your path in quotes.
I often like to see how developers have created something while in production. By exploring what others have done, I can learn from their implementations and write better code myself.
GDB and LLDB Command Examples
A lot of people seem to think normal debugging and reverse engineering applications use a different set of debugging skills. This means you can use Xcode to attach to SpringBoard and use all the shortcuts and commands you are accustomed to.
Open up any Xcode application — yes, any. Stop the process by clicking on the pause button in the LLDB console.
LLDB to GDB Command Map
This will dump every single Objective-C class available to the SpringBoard process. Why not filter the dclass command a bit? This will limit your query to only the UIView subclasses implemented inside commands SpringBoard executable. This will not only dump the class methods and instance methods, but also the properties implemented by this class and the address in memory of where this code is loaded in memory. If you wanted to privately use this SBIconImageView class in your own code, you can use dclass to create an Objective-C header for this private class.
Type the following in LLDB:. This will generate an Objective-C header file you can plug into your own app to utilize this class.
Well, with the search LLDB command, you can dynamically hunt for all instances of a class on the heap. In LLDB, type the following:.
This is nice, but where are these classes in SpringBoard? You can easily query all these classes and perform a custom action on them with an option from the search command. Using the methods command, you can search through interesting code that can help you determine how to uniquely identify a particular SBIconImageView.
Dump the methods implemented by this class. Inside of this class is a property called displayName. Toggle the view off with cojmands tv command:.
The ivars as well as the methods command are built off of code already compiled into an iOS executable. This command will search for all code inside an executable for a particular regular expression name. This will spit out a LOT of code.
LLDB Quick Start Guide
You can actually just get the summary of where this code is with the –summary option instead:. I can use the lookup command to filter queries based upon a module:. This is different for Frameworks, because they need to keep around this information so when loaded, it knows the correct address.
Try this code out:. You might find some amusing things there. If you want to learn the logic behind this, check out Chapter 21 in the book: