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Re: DF mangling
On Tue, May 22, 2018 at 05:40:49PM +0000, Joseph Myers wrote:
> On Tue, 22 May 2018, Segher Boessenkool wrote:
>
> > Hi!
> >
> > The Itanium C++ ABI defines
> > https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling-builtin
> > DF<number>_ as the mangling for the <number> bit IEEE binary float type,
> > i.e. _Float<number>.
> >
> > But the libiberty unwinders decode DF<something> as fixed point type, see
> > https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libiberty/cp-demangle.c;h=3f2a097e7f2075e5750e40a31ce46589d4ab83d5;hb=HEAD#l2659
> >
> > This conflicts. How are we going to resolve it?
>
> I don't think there's any conflict between the mangling DF<number>_ for
> _FloatN, and DF<number>[ijstlmxy]<number>[sn] for fixed point. If DF is
> followed by a number, the following character is '_' for _FloatN and the
> code for an integer type for fixed point.
Ah! Sneaky. Yes that will work; I'll make a patch.
Segher