site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Thread-index: AcmBkKyHb4EqD9+PTTu05qaW/Mq9DgAjGxxg Thread-topic: Easiest way to get function name/offset from a hex address? Terry Lambert wrote on Wednesday, January 28, 2009 4:37 PM

On Jan 28, 2009, at 11:15 AM, Karan, Cem (Civ, ARL/CISD) wrote:

...

I'm using -finstrument-functions to figure out what the stream of calls is that causes my program to crash. Since -finstrument- functions instruments everything with calls to __cyg_profile_func_enter() & __cyg_profile_func_enter(), I have the hex address of the function that is being called, and the site where it is being called from. I'd like to convert that information to printable strings so I know the name of the function and the offset from the start of the function (or, better yet, the line number, but I'll live with the offset). Is there a simple way of doing this lookup? I looked into nlist(), and it appears to have some of the information I need, but I don't see how to get the function names from the information it gives me.

Any help is appreciated.

Within the program itself:

man dladdr

Outside the program itself:

man atos

The debugger, gdb, also has multiple modes in which it operates, two of which can be programmatically controlled (to permit things like GUIs that still use gdb internally). You could open the binary with gdb in one of these modes and interactively query gdb for the information.

Can you tell me what these modes are? Or at least what to look for in the manual?

If the intention is from within the instrumentation, dladdr will be your best bet.

Funnily enough, that was one of the things I tried. Earlier, I couldn't get my program to link when I had it in there. Now it linked. I'm starting to think someone is trying to drive me crazy...

If the intention is post-mortem analysys, your best bet is going to be atos.

If the intention is interactive external analysis (for example, if you are recording non-statistical profiling arcs in shared memory and analyzing them on the fly), your best bet is going to be gdb.

My first choice is GDB, if I can get it to launch GUI apps correctly. However, for alpha/beta testing, the dladdr trick is probably what I'll need. Crash reports just don't give enough info on how I got into the state I'm currently in. Thanks, Cem Karan _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... This email sent to site_archiver@lists.apple.com