request for structure documentation

request for structure documentation

[NZG]

get_prev_register appears to depend on the value of frame_unwind->this_id,
but I can't find any documentation for what this element represents.
Could somebody point me to some documentation or elaborate a bit?

struct frame_unwind
{
  /* The frame's type.  Should this instead be a collection of
     predicates that test the frame for various attributes?  */
  enum frame_type type;
  /* Should an attribute indicating the frame's address-in-block go
     here?  */
  frame_this_id_ftype *this_id;
  frame_prev_register_ftype *prev_register;
};


thx,
NZG

Re: request for structure documentation

[NZG]

A more specific question:

My code appears to be fixable by either causing the architecture specific 
unwind code to return null in frame 0, or by allowing unwind to occur here, 
but then setting the id to invalid on the unwound frame, thus preventing it 
from printing and stopping the chain of get_prev_frames.

But which is correct? This seems unclear from the comments 

thx,
NZG

On Tuesday 24 January 2006 4:29 pm, NZG wrote:
> get_prev_register appears to depend on the value of frame_unwind->this_id,
> but I can't find any documentation for what this element represents.
> Could somebody point me to some documentation or elaborate a bit?
>
> struct frame_unwind
> {
>   /* The frame's type.  Should this instead be a collection of
>      predicates that test the frame for various attributes?  */
>   enum frame_type type;
>   /* Should an attribute indicating the frame's address-in-block go
>      here?  */
>   frame_this_id_ftype *this_id;
>   frame_prev_register_ftype *prev_register;
> };
>
>
> thx,
> NZG

Re: request for structure documentation

[Daniel Jacobowitz]

On Tue, Jan 24, 2006 at 04:51:16PM -0600, NZG wrote:
> A more specific question:
> 
> My code appears to be fixable by either causing the architecture specific 
> unwind code to return null in frame 0, or by allowing unwind to occur here, 
> but then setting the id to invalid on the unwound frame, thus preventing it 
> from printing and stopping the chain of get_prev_frames.
> 
> But which is correct? This seems unclear from the comments 

When you look at a frame, and determine that it is the last frame
(unwinding should stop), return an invalid this_id.  The problem is
presumably that you're failing to make that decision.

-- 
Daniel Jacobowitz
CodeSourcery