[LLVMdev] clang change function name

Haopeng Liu hyliuhp at gmail.com
Mon Mar 2 11:18:35 PST 2015

Thanks for all your help.

"__cxa_demangle" can decode the mangled function name as expected.

Another question is that given an unmangled function name, how to get 
the corresponding mangled name in llvm?


On 3/2/15 3:22 AM, mats petersson wrote:
> Depending on what you want to achieve, one possibility is wrapping
> function declaration with
>     extern "C" void somefunction(void);
> or
>    extern "C" {
>     void somefunction();
>     int otherfunction();
>    }
> will make those functions have their name unmangled - this is used
> when interfacing between C and C++ functions, since the C compiler
> will NOT name-mangle.
> This does however also affect some other aspects of the code e.g.
> linker can't check parameter passing and you can't have more than one
> function with the same name, with different function argument types -
> like you can in C++ [in fact these are the two main reasons for using
> name-mangling]. I can't remember if it also affects the ability for
> example to handle exceptions from C++.
> --
> Mats
> On 2 March 2015 at 09:03, serge guelton <sguelton at quarkslab.com> wrote:
>> On Mon, Mar 02, 2015 at 12:12:34AM -0500, John Criswell wrote:
>>> On 3/2/15 12:07 AM, Haopeng Liu wrote:
>>>> Got it, thanks. But in my pass, I use function name to locate. Can I
>>>> disable mangling in clang?
>>> No, but you can probably fine a library that can either mangle the original
>>> name or demangle the name you're seeing in the LLVM bitcode.
>>> As an FYI, on Unix, the c++filt program will demangle names (although
>>> sometimes you have to remove an extra '_' from the front of the name to get
>>> it to work).
>> there's also a __cxa_demangle function in
>> http://llvm.org/svn/llvm-project/libcxxabi/trunk/include/cxxabi.h
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