[llvm-dev] How to implement function pointer?

[Yafei Liu via llvm-dev]

Hi, I'm learning to use llvm api to generate IR code, I got two good
tutorials, https://llvm.org/docs/tutorial/ and
https://www.ibm.com/developerworks/library/os-createcompilerllvm1/index.html,
but non of those showed how to implement a function pointer(or at least
there is but I didn't find out).

For example I got a c style code like this:

int foo(int i) {
  return ++i;
}

int (*p)(int);

int main() {
  p = foo;
  p(3);
}

I turn it into IR code and found the sytex of a function pointer is:
@p = global i32 (i32)* null, align 8
I tried play with llvm::PointerType but I cannot get the sytex, so could
anyone teach me how to do this?
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