[LLVMdev] Cloning a FunctionDecl?

[Eli Friedman]

On Tue, Mar 27, 2012 at 4:08 PM, Dillon Sharlet <dsharlet at gmail.com> wrote:
> Hello,
>
> Is there a way to clone a FunctionDecl, including the body Stmt if it
> exists? I want to add an entirely new decl to the AST with its own copy of
> the body. I would like to start with a completely identical Decl and body,
> and then modify it to produce a new overload, such that this cloned function
> would appear in overload resolution for calls to the original function.

There is code inside Sema to do something like this as part of
template instantiation; see TreeTransform.h . It isn't exposed outside
of Sema, though,

> What I want to do is somewhat similar to template instantiation, but I've
> been looking through this mechanism and it *appears* that function templates
> don't actually duplicate the body of the function until LLVM code gen, is
> that true?

No, the instantiated function exists independently in the AST.

cfe-dev would be a better list for followup questions.

-Eli