[llvm-dev] print signature of function from dwarf info in file?

[via llvm-dev]

> -----Original Message-----
> From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of
> incertia via llvm-dev
> Sent: Thursday, April 05, 2018 4:30 PM
> To: llvm-dev at lists.llvm.org
> Subject: Re: [llvm-dev] print signature of function from dwarf info in
> file?
> 
> From my understanding, the LLVM classes are just representing the DWARF
> information without doing any extra work, so I am afraid that you will
> have to explicitly chase through all the DWARF information yourself.

That's mostly true.  The only exception is if the function was written
in C++, and the subprogram entry has a DW_AT_linkage_name attribute, that 
will be the C++ mangled name, and you could demangle that.

Aside from that case, you would need to troll through the DWARF to find
the function's return type and parameters, and pretty-print those.

> 
> On 4/5/2018 3:22 PM, Bill O'Hara via llvm-dev wrote:
> > Hi
> >
> > I'm using llvm-5. Browsing the source of llvm-dwarfdump and trying it on
> > some shared libraries, I see I can print the debug info (assuming it
> > exists). For some function, I'm wondering if there's a short cut to
> > prettyprinting the signature of a function in the library? I think,
> > looking at the output, that enough information exists but it seems to
> > involve looking at the subprogram and then chasing references to
> > parameters elsewhere in the debug info and so on.
> >
> > Browsing the llvm headers, I see classes like DISubprogram which appear
> > to represent a function. But no obvious way to get to a string for the
> > function signature.

DISubprogram and friends are internal structures built by the front-end
to pass information to the back-end; the back-end converts those into
DWARF, and DWARF is what you'll see in an object file.  (Or CodeView, in
a Windows object.)
--paulr

> >
> > Can someone point me in the right direction?
> >
> > TIA!
> > bill
> >
> >
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >
> 
> --
> Will
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev