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Re: CFA expression failure

From: Daniel Jacobowitz <drow at false dot org>
To: "H.J. Lu" <hjl dot tools at gmail dot com>
Cc: "Ye, Joey" <joey dot ye at intel dot com>, gcc at gcc dot gnu dot org, "Guo, Xuepeng" <xuepeng dot guo at intel dot com>
Date: Wed, 25 Jun 2008 10:00:10 -0400
Subject: Re: CFA expression failure
References: <BB577BF501703042AD7E08EADD8E514FF5DE3D@pdsmsx415.ccr.corp.intel.com> <20080625034018.GA18541@lucon.org>

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

Follow-Ups:
- RE: CFA expression failure
  - From: Ye, Joey

References:
- CFA expression failure
  - From: Ye, Joey
- Re: CFA expression failure
  - From: H.J. Lu

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