Re: protection from dangling pointers in dwarf info when .so's go away

Daniel Jacobowitz
2007-12-13T03:27:34Z

On Wed, Dec 12, 2007 at 05:57:58PM -0800, Doug Evans wrote:
> Is it the case that vptr_basetype for myclass should never have gotten
> assigned a value pointing into a .so (or any other obstack)?

Sounds likely to me, but may not be practical.

> Or is
> gdb supposed to have cleaned up after itself when the .so data got
> freed?

We do this for user variables when their objfile goes away, by
recursively copying their type. We don't walk types from other
objfiles looking for pointers, so there really shouldn't be any.

> Or something else? Any guidance on where the fix should go is
> appreciated. I suppose an easy solution is to toss out all info, not
> just for .so's, though that will slow down re-runs.

No, that's impossible. Remember dlopen and dlclose.

--
Daniel Jacobowitz
CodeSourcery