It might due to DW_CFA_expression: r6 (esi) (DW_OP_breg5: -8) DW_CFA_expression: r3 (ebx) (DW_OP_breg5: -12) After defining reg via CFA instead of r5, we got less failure.
Thanks - Joey -----Original Message----- From: Daniel Jacobowitz [mailto:[EMAIL PROTECTED] Sent: Wednesday, June 25, 2008 10:00 PM To: H.J. Lu Cc: Ye, Joey; gcc@gcc.gnu.org; Guo, Xuepeng Subject: Re: CFA expression failure On Tue, Jun 24, 2008 at 08:40:18PM -0700, H.J. Lu wrote: > I think the problem is in uw_update_context_1. REG_SAVED_EXP > and REG_SAVED_VAL_EXP may use other registers as shown above: > > DW_CFA_expression: r6 (esi) (DW_OP_breg5: -8) > > They should be handle last. I am testing this patch. Does it > make senses? I think that rather than delaying such expressions, you need to evaluate into a temporary context. DW_OP_breg5 means the current frame's %ebp; DW_CFA_expression: r5 describes the location of the previous frame's %ebp. They're different registers. Otherwise this is going to be too order-sensitive. -- Daniel Jacobowitz CodeSourcery
