[llvm-dev] Function name demangling in llvm ir

[sangeeta chowdhary via llvm-dev]

Hello,

I am doing some program analysis with C++ programs. I need to check if some particular function is called in the program, for that I need the name of the function being called in the call instruction. Since C++ mangles the name of the function, I need a way to demangle the function name in llvm IR. Is there any way to achieve that in llvm pass?

Regards,

Sangeeta

[Johannes Doerfert via llvm-dev]

I have not tried it but maybe

`std::string llvm::demangle(const std::string &MangledName)`

in `llvm/Demangle/Demangle.h`

is already what you want.

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[David Blaikie via llvm-dev]

(though, usual caveat: you /usually/ shouldn't be doing that - instead
relying only on whatever semantics the IR actually carries, rather
than implying extra semantics based on the demangled name)

[sangeeta chowdhary via llvm-dev]

Any particular reason to avoid demangling?

[David Blaikie via llvm-dev]

On Wed, Jun 24, 2020 at 1:26 PM sangeeta chowdhary
<sangitac...@gmail.com> wrote:
>
> Any particular reason to avoid demangling?

It's not part of the semantics of LLVM IR - so optimization should not
rely on it (different mangling schemes might be used on different
platforms - breaking the analysis/optimizations based on them - other
optimizations might not preserve the properties you're looking
for/assuming exist because of the mangled name, etc)