Make sure the Simulator is alive and running the VCTransitions project.
Make a DTrace one-liner in Terminal to ensure that you can see these methods getting hit. Jump over to OjbCViewController.m and take a look at the IBAction methods implemented by this class. If you tap Execute Methods, it will call anEmptyMethod as well as all the getters for the overridden properties, since all of those methods don’t require parameters. If the method takes no parameters, it executes it.įor example, the first view controller displayed is ObjCViewController. There are buttons to perform the two navigation pushes, and there’s also a button named Execute Methods that will loop through all known Objective-C methods which are implemented/overriden by a given Class. You’ll be exploring some assembly in this chapter, and I can’t guarantee it’s unchanged in a new iOS version that I’ve not viewed (at the time of writing). This time, however, I insist you run iOS 12.1.x (or earlier) since you’ll be viewing assembly that could change in a future release.
ITRACE FOR APPLE SOFTWARE
Note: Normally I don’t care about the exact version of the software you’re running, so long as it’s iOS 12. We’ll talk more about the Stripped VCTransitions scheme in a second. Make sure to select the VCTransitions scheme when running. It’s important to note, there are two schemes inside this application: VCTransitions and Stripped VCTransitions. Open up this Xcode project, build and run on the iPhone XS Simulator and take a quick look around. Included in the starter folder is an app called VCTransitions, which is a very basic Objective-C/Swift application that showcases a normal UINavigationController push transition, as well as a custom push transition.
ITRACE FOR APPLE CODE
In this chapter you’ll use DTrace to hook objc_msgSend’s entry probe and pull out the class name along with the Objective-C selector for that class.īy the end of this chapter, you’ll have LLDB generating a DTrace script which only generates tracing info for code implemented within the main executable that calls objc_msgSend. However, when exploring Apple code, you still have one very powerful ally on your side: objc_msgSend. Unfortunately, when DTrace is put up against a stripped executable, it is unable to create any probes to dynamically inspect those functions. You’ve used DTrace to trace this code and make interesting tweaks all while performing zero modifications to already compiled source code. You’ve seen how powerful DTrace is against Objective-C and Swift code which you have the source for, or code that resides in a Framework like UIKit. 27.1 So how are you doing this, exactly?.SB Examples, Resymbolicating a Stripped ObjC Binary 26.2 lldbinit directory structure suggestions.24.5 Passing parameters into the breakpoint callback function.23.3 Creating the BreakAfterRegex command.23.2 Learning & finding documentation on script bridging classes.22.1 Debugging your debugging scripts with pdb.21.3 Creating your first LLDB Python script.Section IV: Custom LLDB Commands Section 4: 8 chapters 18.5 Programmatically finding segments and sections.17.2 Sidestepping checks in prepareDebuggingOverlay.Exploring & Method Swizzling Objective-C Frameworks Hooking & Executing Code with dlopen & dlsym 15.6 Loading frameworks on an actual iOS device.15.2 Statically inspecting an executable’s frameworks.14.2 The foundation of attachment, ptrace.Section III: Low Level Section 3: 7 chapters 8.4 The Xcode GUI watchpoint equivalent.5.2 Swift vs Objective-C debugging contexts.Section I: Beginning LLDB Commands Section 1: 10 chapters
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