[Issue 11586] New: core.demangle should understand _D16TypeInfo_HAyayAa6__initZ etc.

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11586

           Summary: core.demangle should understand
                    _D16TypeInfo_HAyayAa6__initZ etc.
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: druntime
        AssignedTo: nobody at puremagic.com
        ReportedBy: destructionator at gmail.com


--- Comment #0 from Adam D. Ruppe <destructionator at gmail.com> 2013-11-23 19:47:24 PST ---
I talked about it in detail here:

http://forum.dlang.org/thread/gmwlbnwwtszgueogikjy@forum.dlang.org?page=2#post-vcafquufzkrpuaqktqbr:40forum.dlang.org

shorter version:

I think the reason that "_D16TypeInfo_HAyayAa6__initZ" couldn't 
get automatically demangled is because it is a special name that 
doesn't actually follow the ABI spec. It's compiler generated 
info whose mangle looks kinda like a function, but it lacks the 
calling convention or return value that core.demangle requires to 
be there to consider a valid name.

[...]


So that crazy name "TypeInfo_HAyayAa" actually follows the very 
same pattern. This might be the one time outside eyeball 
debugging when knowing your mangles by hand is actually useful!

On the other hand, perhaps it'd be a good idea to add recognition 
of this pattern to core.demangle, so it can print out the much 
prettier

typeid(immutable char[][immutable(char)[]])

cuz that's how you'd likely refer to it in code anyway.

* * *

The underlying bug that produces the linker error in the first place ought to
be fixed too (though over the years, I've been unable to produce a reliable
test case! it seems to come and go at random, I think presence of other code
that uses it or compile command line order may affect it, but have never
isolated the problem).

Anyway, at least adding support for the name here will help future people debug
it without having to know all the mangling rules.

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