How to add a breakpoint to objc_exception_throw?

Question

this was the answer from the brad larson on this SO question

If you add two breakpoints, you should be able to debug these exceptions. To do this, go to Run | Show | Breakpoints and create two global breakpoints (I do them globally because they are so useful in all my applications). The first should be named "objc_exception_throw" and its location should be "libobjc.A.dylib". The second should be "-[NSException raise]" and its location should be "CoreFoundation".

Now, if you start debugging your application with breakpoints enabled, it should break on the throw of these exceptions. You should then be able to see the chain of events that led to the exception within the debugger.

now in this answer i want to ask how do i add location mentioned???

Check out this thread on the Apple Dev Forums for instructions on how to do this in XCode 4: https://devforums.apple.com/thread/68421 — Andy Sinclair, Oct 18 '11 at 19:12

score 81 · Accepted Answer · edited Jun 20 '15 at 02:00

81

I think Brad's answer is pretty clear; hopefully this can help if you're not finding it clear.

In Xcode, from the top menu click on Run > Show > Breakpoints. A new window pops up.

Select "global breakpoints" in the left hand menu. There should be a box on the right under the "Breakpoint" column with the text "Double-Click for symbol". Single-click in this box and type in "objc_exception_throw".

Then, single-click in the space next to "objc_exception_throw" under the "location" column. A box will appear for you to type in the location (in this case, "libobjc.A.dylib"). I've made a screenshot that will hopefully help:

alt text

edited Jun 20 '15 at 02:00

Spooky

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answered Jul 22 '09 at 11:38

h4xxr

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In Xcode 4, there is a breakpoint navigator where you can add these. – Don Apr 07 '11 at 18:14
Also you can install [script that prints exception description in console](http://stackoverflow.com/a/29671227/991816), must have! – DanSkeel Apr 16 '15 at 10:11

score 45 · Answer 2 · answered Feb 08 '13 at 06:38

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In Xcode 4 this great breakpoint can be added via "+" button on Breakpoints section (⌘ + 6)

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answered Feb 08 '13 at 06:38

Valerii Pavlov

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This same approach can be used in XCode 5 – Ameer Sheikh Oct 02 '13 at 12:02
Also you can install [script that prints exception description in console](http://stackoverflow.com/a/29671227/991816), must have! – DanSkeel Apr 16 '15 at 10:10

score 6 · Answer 3 · edited Jun 30 '15 at 13:19

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in Xcode 6 -- from top menu

Debug > Breakpoints > Create Exception Breakpoint

edited Jun 30 '15 at 13:19

Alex Cio

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answered Apr 07 '15 at 08:02

user3812138

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The other answers have changed, this answer is the correct one as of April 2017/Xcode8 – Josh Apr 26 '17 at 07:59

score 4 · Answer 4 · edited Apr 25 '12 at 07:28

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I would also like to recommend adding the +[NSException raise:format:arguments:] breakpoint and its location should be CoreFoundation.

edited Apr 25 '12 at 07:28

El Developer

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answered Sep 03 '10 at 07:54

Ameer Sheikh

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How to add a breakpoint to objc_exception_throw?

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