[Dwarf-Discuss] Possible ambiguity with DW_CFA_remember_state/store_state

Jakub Jelinek jakub at redhat.com
Fri Jun 12 16:56:14 PDT 2009


On Fri, Jun 12, 2009 at 07:46:34PM -0400, John DelSignore wrote: FWIW,
> TotalView saves the CFA along with the explicitly-numbered registers. So,
> it seems that TotalView and GDB agree, and that GCC is the outlier. IMHO,
> it's two against one, so GCC should be fixed.

If TotalView saves CFA along with explicitly-numbered registers on
DW_CFA_remember_state and restores CFA state in DW_CFA_restore_state, then
it matches what GCC expects and what GCC unwinder does, it is GDB that
wasn't saving/restoring CFA state (and GCC unwinder before 2006-10-26,
but GCC really started emitting these two unwind ops last month).

	Jakub



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