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Re: [PATCH] Preliminary DW_OP_{implicit,stack}_value support (take 2)


On Thu, Jun 11, 2009 at 11:51:38PM -0700, Richard Henderson wrote:
> Both this and simplify-rtx.c could benefit from an rtl version of
> the native_encode_expr/native_interpret_expr tree routines.

Perpahs just native_encode_rtx would be needed.  Can look into it...

> And of course we can't have this going out in gcc 4.5 until the
> dwarf4 spec is released.  Is there an eta on dwarf4?  If not,
> perhaps this code should simply stay on a branch somewhere...

I'd say we have a precedent of using DWARF3 draft features years before
DWARF3 has been released (say DW_CFA_def_cfa_expression), but if you want to
be cautious this time...
Cary, can you find out if there is an approx. eta on DWAF4?  This year, in
2 years, within next decade?
If it would take too long, perhaps using DW_OP_GNU_stack_value (0xf2?)
would be the way to go.

	Jakub


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