Re: [Valgrind-developers] valgrind: r12180 - trunk/tests

[Julian S. <js...@ac...>]

On Thursday, October 20, 2011, Florian Krohm wrote:
> On 10/20/2011 04:45 PM, Christian Borntraeger wrote:
> >> +# Suppress warnings from Dwarf reader
> >> +sed '/warning: evaluate_Dwarf3_Expr: unhandled DW_OP_/d'
> > 
> > Hmmm, isnt this actually a bug, if gcc generated dwarf Ops that valgrind
> > doesnt handle?
> 
> Yes, it is. However, Julian looked at it and concluded that this would
> be difficult to fix given the current dwarf infrastructure.
> Suppressing these warnings is clearly less than ideal, but helps
> filtering the regression that matter out of the noise.

IIRC it was failing on DW_OP_piece (0x93 I think). This is related to
variables that are partly in memory and partly in registers, eg a 64-bit
value that has been partially spilled on a 32-bit CPU.  The current
infrastructure cannot represent them.  For sure, hiding error messages
with other DW_OP_ values isn't good, since we'll need to support them
at some point (as Christian implies).

J