[LLVMdev] clang change function name

[mats petersson]

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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