Xcode debugger stopped displaying local and self variables

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Xcode debugger stopped displaying local and self variables

I don't understand this at all, but I can no longer see any locals or ivars when debugging my iPhone app with Xcode 3.2.3. Everything seemed normal until yesterday afternoon, and now I just see the globals and registers, which are not of much interest to me.

HAs anyone else had this experience? I feel like I have gone crazy. How can the debugger "forget" to show me variables? Its the debug build, non-optimized code generation, breakpoints work, where are the variables?

I am so sorry I upgraded to Xcode 3.2.3. What a mistake that was. I am so not impressed.

Oh, yeah, I built a template app just to see if THAT one would debug normally and it does, so I am looking at the differences in the project settings to see if that holds a clue.

Close the project, open Terminal, cd into the <project>.xcodeproj directory, delete all <username>.* files (i.e. delete everything except project.pbxproj), then try opening your project again.

(Note: don't worry about the files you are deleting - they are just per-user setting files for things like window positions, saved breakpoints, etc - the important stuff is all in project.pbxproj.)

One other thing that has also solved problems for me in the past is to trash the entire build folder.

Paul R 2010-07-23 20:57:54

Yeah, I tried that (via the Finder, but same idea). I set three breakpoints at various points in the code. The first two I get to, I see locals/self/arguments. When I get to the last (the deepest into the app), all I see are the globals/registers. There is a local var right there in the code, and its value has been printed out to the console via a NSLog call, but the debugger does not show it. Another odd thing is that Xcode no longer seems to have tooltips for the variables. Anyone notice that?

Paul 2010-07-23 21:35:23

Try deleting the build folder too - that can sometimes clear problems that a "clean" doesn't fix.

Paul R 2010-07-24 08:37:52

Did that too.After much head scratching, I am thinking that something is seriously wrong with my code. If I set a breakpoint early in the lifecycle of the app, I see the vars. Its only farther along that lifecycle that the vars disappear, and now I am finding that very soon thereafter the app crashes. So, What I am thinking now is that I have some major stack corruption going on, and that I need to deal with that.

Paul 2010-07-24 16:42:11

@Paul: yes, that makes sense - if your stack is hosed then that may well confuse gdb.

Paul R 2010-07-24 17:02:52

I just had the same problem and it turned out to be which compiler I had set in the project settings. Switched it to GCC 4.2 and they started showing up again.

Rob 2010-08-18 22:13:22

I upgraded from Xcode 3.2.3 to 3.2.4 and changed the SDK version to 4.1 and this problem went away. Other work arounds didn't work for me.

Rn222 2010-09-16 01:15:30

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Xcode debugger stopped displaying local and self variables

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