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Re: [PATCH] S390: Add use of unavailable-stack frame ID


On 03/07/2016 10:19 AM, Andreas Arnez wrote:
When determining the frame ID of an inline frame, GDB currently asserts
that a valid ID of the underlying real frame is found, and that it does
not match outer_frame_id.  From inline_frame_this_id():

   /* For now, require we don't match outer_frame_id either (see
      comment above).  */
   gdb_assert (!frame_id_eq (*this_id, outer_frame_id));

However, this assertion may fail when the real frame's unwinder can not
determine the frame ID.  This happened on an s390x target with a binary
that lacked call frame information and also confused the prologue
analyzer, because then s390_frame_this_id() left the frame ID at its
default.

To fix this, this change enhances s390_frame_this_id such that an
unavailable-stack frame ID is built if no frame base can be determined
but the function address is available.


Seeing all these makes me want this:

 https://sourceware.org/ml/gdb-patches/2016-02/msg00778.html

even more.  :-)

Thanks,
Pedro Alves


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