Blog Archives

Printing a C array in the debugger Console

I’m by no means a GDB expert.  I know the basics, but I just learned this gem today.  Say you have a C array with five items created with something like this:


int *array = malloc(5 * sizeof(int));

And you want to print it out in the debugger quickly.  You can’t just print the pointer because GDB doesn’t know to print it as an array, but this will:


p *array@5

Output:


$1 = {0, 0, 0, 0, 0, 1}

To use this the left hand side, before the ‘@’ should be an array, and the right hand side needs to be the length of the array.  Very handy.

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Most complete and polite error message ever

“An instance 0x2dd390 of class TipsImportOperation was deallocated while key value observers were still registered with it. Observation info was leaked, and may even become mistakenly attached to some other object. Set a breakpoint on NSKVODeallocateBreak to stop here in the debugger. Here’s the current observation info:”

Why can’t every error be so nice?