[llvm-dev] VC C++ demangler

[Rui Ueyama via llvm-dev]

We have clang/lib/AST/MicrosoftMangle.cpp, so looks like what I should do
is to write code that do the reverse of it. One thing I should be careful
is to produce the exact same outputs as Microsoft's UnDecorateSymbolName
function would output so that the behavior doesn't change between Windows
and non-Windows platforms, but it probably shouldn't be hard.

On Mon, Jun 19, 2017 at 12:34 PM, Martin J. O'Riordan <
martin.oriordan at movidius.com> wrote:

> A long time ago, when I devised the grammar and structure of the Microsoft
> C++ name mangling scheme (decorated names), the document describing the
> object model and the name decoration scheme were made publically
> available.  Perhaps this is still available publically, or perhaps
> Microsoft might be willing to share an up to date definition of the
> name-decoration grammar, especially in light of the integration of CodeView
> debugging information into LLVM, which somewhat ties in with this.
>
>
>
> This was expressed as a regular BNF grammar, so it should be possible to
> create a clean-room implementation of both the “mangler” and “de-mangler”
> from that BNF definition if it still exists in that form.  Does the
> recently added CodeView debug information not provide this description (I
> admit I haven’t looked)?
>
>
>
> Certainly tools like ‘c++filt’ do not know about the Microsoft name
> decoration scheme, but LLVM does know how to mangle the names using the
> VC++ ABI, and since the mangling follows a regular grammar, the de-mangling
> should be relatively straight-forward to implement.
>
>
>
> All the best,
>
>
>
>             MartinO
>
>
>
> -----Original Message-----
> From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of
> Davide Italiano via llvm-dev
> Sent: 19 June 2017 19:00
> To: Rui Ueyama <ruiu at google.com>
> Cc: llvm-dev <llvm-dev at lists.llvm.org>
> Subject: Re: [llvm-dev] VC C++ demangler
>
>
>
> On Mon, Jun 19, 2017 at 10:53 AM, Rui Ueyama via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> > Hi,
>
> >
>
> > We have a demangler for the Itanium ABI, but looks like we don't have
>
> > one for the MSVC-style symbols. Is there any good demangler we can
>
> > import to LLVM?
>
> >
>
> > If there's no suitable demangler, I'd like to write one. Currently, we
>
> > are using `UnDecorateSymbolName` function, but the function is
>
> > available only on Windows (which is problematic when you are doing a
>
> > cross-build), and the function is not thread-safe. These two seem to
>
> > be an enough reason to have our own demanler.
>
> >
>
>
>
> I'm not aware of a suitable one, currently. I agree it would be very
> useful to have.
>
>
>
> --
>
> Davide
>
>
>
> "There are no solved problems; there are only problems that are more or
> less solved" -- Henri Poincare ______________________________
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