c++ - How to get the arguments of a function pointer from a CallExpr in Clang? -

i trying analyse c source code function calls within them. able analyse normal function calls arguments without problem using source code below ce callexpr object:

1.  if(ce != null) {             2.      qualtype q = ce->gettype(); 3.      const type *t = q.gettypeptrornull(); 4. 5.      if (t != null) { 6.          llvm::errs() << "type: " << t->isfunctionpointertype() << " " << q.getasstring() << " " << t->ispointertype() << "\n"; 7.      } else { 8.          llvm::errs() << "function ce has no type?\n"; 9.      } 10. 11. 12.     const decl* d = ce ->getcalleedecl(); 13.     while(d->getpreviousdecl() != null)  14.         d = d->getpreviousdecl(); 15.          16.     llvm::errs() << "kind:  " << d->getdeclkindname() << "\n"; 17.      18.     functiondecl* fd = (functiondecl*) llvm::dyn_cast<functiondecl>(d); 19.     for(int x = 0; x< fd ->getnumparams(); x++) { 20.         if(fd ->getparamdecl(x)->gettype()->isanypointertype()) { 21.             // stuff here 22.         }  23.     } 24. } 

the problem above source code comes on line 18, when try typecast decl callexpr functiondecl, results in fd becoming null if callexpr function pointer call.

i tried debug trying print kind on line 16. function pointers, specifies decl on 12 vardecl, not functiondecl normal function calls.

i tried using isfunctionpointertype(), returning false.

here piece of source code results in segfault:

#include <stdio.h> #include <stdlib.h>  int main(int argc, char *argv[]) {     void* (*mp)(size_t size);     void *mpp;      mp = &malloc;     mpp = mp(30);      free(mpp);     return (0); } 

is there way using clang detect whether callexpr function pointer call? , if so, how list of arguments?

i using clang 3.1

thanks

use getdirectcallee() function (i not sure if available in clang 3.1 or not) functiondecl *func = ce->getdirectcallee();

if (func != null){     for(int = 0; < func->getnumparams(); i++){         if(func->getparamdecl(i)->gettype()->isfunctionpointertype()){             // stuff here         }     } }