Generating function pointers in LLVM

I am writing my first LLVM sample. I am trying to build a small LLVM module consisting of a function which takes in a name of a function and returns a pointer to it. The problem is I don't know how to generate function pointers in LLVM. I have got a Function object by calling getDeclaration(...). Is there some way I can get a poi开发者_开发问答nter to it?

Function is a GlobalValue, so it is the pointer by itself. In the meantime, you can use LLVM's C++ backend to generate the C++ API calls which will recreate the IR you're feeding to llc.

For example, feed the following code into http://llvm.org/demo:

void foo(int (*bar)(int));

int factorial(int X);

int main(int argc, char **argv) {
  foo(factorial);
}

Make sure you have the "Show LLVM C++ API code" checkbox selected and you'll see the corresponding LLVM IR and the C++ API calls which will recreate it.