[cfe-dev] can Clang Plugin modify the AST and send it back to the next step of compliation?

[Yafei Liu via cfe-dev]

Hi Miklos, I think applying replacements to original source file is not
what I expect, it does not act as a "dialect" to me.

What I want to do gives a feeling of "AST programming" (I just made up this
term).

On Wed, Sep 2, 2020 at 5:24 PM Miklos Vajna <vmiklos at vmiklos.hu> wrote:

> Hi,
>
> On Wed, Sep 02, 2020 at 02:36:38PM +0800, Yafei Liu via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
> > All the examples of Clang plugin and FrontendActions I've read are to get
> > the AST and print some information, I'm curious if I can modify the AST
> to
> > make some dialect C++ language?
> >
> > I got some examples I think is easy to do if AST could be modified:
> > 1. make all subclasses inherit baseclasses' friend class
> > 2. make all method virtual (like Java)
>
> The typical workflow is to emit fixits/replacements and then apply them,
> rather than modifying the AST. clang-tidy has plenty of checks which do
> this already.
>
> Regards,
>
> Miklos
>
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