[LLVMdev] What is a FunctionType really?

[David Blaikie]

On Sun, Nov 18, 2012 at 6:40 AM, edA-qa mort-ora-y <eda-qa at disemia.com> wrote:
> This may sound weird, but what exactly is a FunctionType? That is, in
> terms of memory, or underlying value, what does the FunctionType
> actually represent. At first I though it might be a pointer, but it is
> not -- since you have to wrap a PointerType around it to use as such.
> Can a FunctionType value actually exist, or is strictly an abstract
> concept? In particular, can I actually directly define some type to be a
> function type, or must I always declare it as a pointer to that type?

Types, function or otherwise, have no in-memory representation. They
merely describe how bits should be interpreted.

- David

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