alanzeino

LLDB Debugging Cheat Sheet

Commands

LLDB Commands

LLDB comes with a great set of commands for powerful debugging.

help

Your starting point for anything. Type help to get a list of all commands, plus any user installed ones. Type 'help for more information on a command. Type help to get help for a specific option in a command too.

jspahrsummers

/// Observes a run loop to detect any stalling or blocking that occurs.
///
/// This class is thread-safe.
@interface GHRunLoopWatchdog : NSObject

/// Initializes the receiver to watch the specified run loop, using a default
/// stalling threshold.
- (id)initWithRunLoop:(CFRunLoopRef)runLoop;

/// Initializes the receiver to detect when the specified run loop blocks for

0xc010d

- Copy the delivered ipa into a directory to work in. 

- export PlistBuddy="/usr/libexec/PlistBuddy" to get the PlistBuddy tool to your shell. If it is not added, all references to PlistBuddy
  will need to be written as the full path. 

- Take the delivered App.ipa and unzip it using the unzip command. This should produce a Payload directory containing the app and its 
  resources. 

- Enter the command "codesign -d --entitlements :enterprise.plist Payload/PathToApp.app/" This pulls the entitlements out of the app, and 
  prints them to a plist, without a leading "blob" of data. Pay particular attention to the colon before the enterprise.plist file name. 

mattt

Greetings, NSHipsters!

As we prepare to increment our NSDateComponents -year by 1, it's time once again for NSHipster end-of-the-year Reader Submissions! Last year, we got some mind-blowing tips and tricks. With the release of iOS 7 & Mavericks, and a year's worth of new developments in the Objective-C ecosystem, there should be a ton of new stuff to write up for this year.

Submit your favorite piece of Objective-C trivia, framework arcana, hidden Xcode feature, or anything else you think is cool, and you could have it featured in the year-end blowout article. Just comment on this gist below!

Here are a few examples of the kind of things I'd like to see:

• Using NSStringFromSelector(@selector()) as a safer way to do KVC / KVO / NSCoding.
• Panic's [rather surprising discovery about the internals of the Lightning Digital AV Adapter](http://www.panic.com/blog/the-lightning-di

friggog

#Loading Tweaks in the Simulator

With the latest updates to the simulator, this turns out to be pretty simple:

You need to be using kirb/theos

In order not to require MobileSubstrate to be loaded and your tweak to be compiled for i386/x86_64, add

In your makefile:

jk

#!/usr/bin/env perl
# objc_api_visibility.pl
#   by Ryan Petrich, inspired by Dustin Howett's Logos
# Reads all Objective-C method names from an installed SDK, determines their visibility and optionally compares against an iOS app binary

sub read_methods {
	my $cmd = shift;
	my $when_found = shift;
	my $current_class;
	open(LS_CMD, "$cmd |") or die "Can't run '$cmd'\n$!\n";

steipete

BOOL PSPDFSystemFunctionOverriddenInCategory(Class theClass, SEL selector, NSString *__autoreleasing* categoryName) {
    NSCParameterAssert(theClass);
    NSCParameterAssert(selector);

    Dl_info info;
    if (dladdr(class_getMethodImplementation(theClass, selector), &info)) {
        // /System/Library/Frameworks is a common denominator, some methods are in /usr/lib/libobjc.A.dylib
        // Custom app is in /private/var/mobile/Containers/Bundle/Application/<UID>/PSPDFCatalog.app/PSPDFCatalog
        if (!strstr(info.dli_fname, "/System/Library") && !strstr(info.dli_fname, "/usr/lib")) {
            if (categoryName) *categoryName = @(info.dli_sname);

mattt

Season's Greetings, NSHipsters!

As the year winds down, and we take a moment to reflect on our experiences over the past months, one thing is clear: 2014 has been an incredible year professionally for Apple developers. So much has happened in such a short timespan, and yet it's hard to remember our relationship to Objective-C before Swift, or what APIs could have captivated our imagination as much as iOS 8 or WatchKit.

It's an NSHipster tradition to ask you, dear readers, to send in your favorite tips and tricks from the past year for publication over the New Year's holiday. This year, with the deluge of new developments—both from Cupertino and the community at large—there should be no shortage of interesting tidbits to share.

Submit your favorite piece of Swift or Objective-C trivia, framework arcana, hidden Xcode feature, or anything else you think is cool, and you could have it featured in the year-end blowout article. Just comment on this gist below!

If you're wondering about what to post, look to

winocm

/*
 * Shadowmapping, a way of bypassing iOS 'kernel page bits protection'. 
 * (ARM32 only for now obviously.)
 *
 * Also a very nice and easy way of copying data in and out of kernel memory
 * by breaking the barrier entirely. Thank you TTBCR and split TTBR0/TTBR1!<3
 *
 * Control flow goes like this if you have a write anywhere exploit:
 *
 *  - Find location of kernel_pmap (dereference to get kernel_pmap_store.)

delebedev

#!/usr/bin/env ruby

require 'net/http'
require 'json'
require 'ostruct'
require 'fileutils'

PATH = "https://devimages.apple.com.edgekey.net/wwdc-services/ftzj8e4h/6rsxhod7fvdtnjnmgsun/videos.json"
WWDC_DIR = "#{Dir.home}/Downloads/wwdc"