[LLVMdev] How do you determine whether a function is defined externally to a module ?

[Chris Lattner]

On Sun, 3 Jul 2005, Aaron Gray wrote:
> How do you determine whether a function is defined externally ?
> Basically I want a list of external functions but cannot seem to get one.
>
> e.g. I want to create the following list for a module
>
> EXTERN _printf : NEAR
> EXTERN _malloc : NEAR
> EXTERN _an_external_fn : NEAR
>
> I have tried all the obvious permutations but cannot seem to get only the extrnally defined symbols.

Something like this should work:

for (Module::iterator F = M->begin(), E = M->end(); F != E; ++F)
   if (F->isExternal())
     ... Function* F is external! ...

If you take a look at the PowerPC asm printer, it has to do some special 
things for external functions as well, it might give you some ideas.

-Chris

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