frame addr usage

[Andrew Cagney]

Bob Weber wrote:
> The gdb documentation lists the ability to access a frame by it's address
> frame addr
> 
> Can anyone tell me how to use this command?  
> Does it work on the x86 platform?
> Is there special syntax required?
> 
> If I type the 
> info frame
> 
> I get 
>  
> (gdb) info frame
> Stack level 14, frame at 0xbfeff568:
>  eip = 0x40127db9 in task_internals::allocate(unsigned) (file.cxx:134); saved eip 0x40127db9
>  called by frame at 0xbfeff728, caller of frame at 0xbfeff3a8
>  source language c++.
>  Arglist at 0xbfeff568, args: this=0xbffff490, requested_stack_size=1056768
>  Locals at 0xbfeff568, Previous frame's sp in esp
>  Saved registers:
>   ebp at 0xbfeff568, eip at 0xbfeff56c
> 
> I would think I could reference the previous from with  the address 0xbfeff728 like so
> 
> (gdb) frame 0xbfeff728
> 
> But this is the result returned
> 
> #0  0x00000000 in ?? ()

Your use looks right, however it's clearly not working (which isn't 
suprising as the feature lacks automated test coverage :-().

Interested in helping with this?

Andrew