Some part of a big code base is printing out weird NSLog statements, and I'm trying to detect where it's coming from. Is there a way to put 1 breakpoint at the start of every NSLog call so I can see where it's being called from, rather than manually have to put breakpoints on all places that call NSLog?
In Xcode 6:
Step 1:
On the Navigator on the left, go to Breakpoint Navigator (command ⌘ + 7):
Step 2:
Click the + button on the bottom left (Add a new breakpoint),
then choose Add Symbolic Breakpoint...:
Step 3:
In Symbol, type NSLog.
Alternatively, you can do the same thing in Debug → Breakpoints → Create Symbolic Breakpoint.
Fo Xcode 5, see this.
If you want to break on a certain log message you can use:
This example will break on every log containing the word "Warning".
Update: On newer devices use $x0. Simulator and older use $r0. $arg0 should do for all cases.
In the breakpoint navigator (command+6) add (on the bottom, there is a Plus symbol) a symbolic breakpoint and use NSLog as symbol.
According to this you can set that kind of breakpoint by doing so in the lldb console:
breakpoint set --name NSLog
One way to do this using Xcode could be to put a breakpoint in the main function or on you AppDelegate applicationDidFinishLaunchin (read: as soon as possible).
Then, you run your app, and when it pauses on said breakpoint, you have access to the lldb console: you type the above line and hit return, and lldb prints something like this:
Breakpoint 3: where = Foundation`NSLog, address = 0x32a3da08
At this point, you resume your app, and it will pause again when NSLog is called (pay attention to the call stack using the Debug Navigator).
来源：https://stackoverflow.com/questions/17240698/is-there-a-way-to-set-a-breakpoint-at-the-start-of-any-nslog-statement