libunwind-using-elfutils mail review

[Jan Kratochvil <jan dot kratochvil at redhat dot com>]

Hi Andrew,

please check the mail to <libunwind-devel@nongnu.org>.

I would like to suggest some frysk's libunwind changes merge upstream...

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Hi,

as there were various issues of resolving address->name by libunwind
src/elfxx.c I replaced it with the resolver from the package "elfutils".
The former src/elfxx.c updates are still available and ChangeLog described at:
	cvs -d :pserver:anoncvs@sources.redhat.com:/cvs/frysk co libunwind
Attached patch has been ported to the current GIT version of libunwind.

As elfutils does not support .eh_frame (unwinding) only the .symtab/.dynsym
based resolving - get_proc_name() - is supported.

dwarf_search_unwind_table() now also uses elfutils but only to verify the
libunwind's function range found in .eh_frame.  This part could be removed
resulting in an implementation only based on unw_accessors_t pointers change.

elfutils is available at:
ftp://sourceware.org/pub/systemtap/elfutils/elfutils-0.125.tar.gz (tested on 0.126)
http://download.fedora.redhat.com/pub/fedora/linux/core/development/source/SRPMS/elfutils-0.126-1.fc7.src.rpm
Recommended pending elfutils patch: https://bugzilla.redhat.com/bugzilla/attachment.cgi?id=149158

TODO:
 * ia64 fix (split dwarf_get_proc_name() from dwarf_search_unwind_table()).
 * Probably fix the UNW_LOCAL_ONLY mode where there is no way to store the
   current `unw_addr_space.dwfl'.
 * Profile the performance.
 * API to pass existing `Dwfl *' from the application (==debugger) down to
   libunwind for reusal by elfutils (currently new `Dwfl *' is created).


Regards,
Jan

Attachment: libunwind-using-elfutils-5upstream.patch
Description: Text document