[LLVMdev] [lld] adding demangler for symbol resolution

[Sean Silva]

The simplest long-term solution would probably be to just add demangling in
a portable way to libSupport. Then we don't need to conditionalize or
anything. We just call llvm::demangle(). This is the only viable solution
for proper cross-linking anyway.

Given that there should be existing demanglers we can reuse, I'm not sure
that this long term solution is significantly more difficult than the short
term solution you are proposing.

-- Sean Silva

On Tue, Apr 1, 2014 at 9:19 PM, Shankar Easwaran <shankare at codeaurora.org>
wrote:
>
> Hi Nick, Bigcheese,
>
> When lld is used to link C++ code, it would be required to demangle symbol
> names by default/user driven option.
>
> The Gnu linker has the following options :-
>
> --demangle=[style]
> --no-demangle
>
> I found that clang/llvm-symbolizer use __cxx_demangle function.
>
> I would think that lld also need to call the same function, and I think
> the way we want to demangle is to have the function in LinkingContext as
> various flavors may choose to use different API's to demangle symbol names.
>
> The API's that would be in LinkingContext would be :-
>
>         * virtual bool canDemangle()  = 0; // Does the flavor provide a
> way to demangle symbol names ?
>         * virtual std::string demangle(StringRef symbolName) = 0; //
> demangle the symbol name
>
> Thoughts / Suggestions ?
>
> Thanks
>
> Shankar Easwaran
>
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