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Re: RFA: Improvements to libiberty v3 demangler

On Tue, Nov 18, 2003 at 11:06:12PM -0500, Ian Lance Taylor wrote:
> Daniel Jacobowitz <> writes:
> > On Tue, Nov 18, 2003 at 10:24:22PM -0500, Ian Lance Taylor wrote:
> > > Here are some patches which improve the libiberty v3 demangler.  These
> > > mostly improve the handling of CV qualifiers.  Previously these would
> > > tend to appear at the end of the string.  This patch attempts to put
> > > them in the right place.  This fixes some of the errors caught by the
> > > testsuite, and does not introduce any new errors.
> > > 
> > > After getting this far, I've realized that the whole approach used by
> > > this code is fundamentally broken.  Thie approach taken by this code
> > > can not handle substitutions correctly, because demangling pointers
> > > and references to substitutions, to say nothing of qualifiers,
> > > requires knowing the structure of the substitution source, and this
> > > code does not have that information.
> > > 
> > > Still, this patch is an improvement over what is there now, and does
> > > fix some bugs.
> > 
> > I don't suppose you've run the GDB testsuite with these changes? 
> > Something which moves CV qualifiers around is likely to break it.  Not
> > badly, but enough to need to tweak the regexes again.
> Thanks for the suggestion.
> I just checked the gdb testsuite, and it doesn't appear to make any
> difference.  I'm not sure the gdb testsuite really tests the v3
> demangler code at all.  At least, I don't see any tests for it in
> gdb.cp/demangle.exp.

We don't check the demangler in demangle.exp, because it has its own
testsuite.  It does, however, affect output in a number of other C++

Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

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