[llvm-dev] Subclassing LLVM Type

[陳韋任 via llvm-dev]

This [1] might worth reading, Malhar.

[1] http://llvm.org/docs/HowToSetUpLLVMStyleRTTI.html

2017-06-10 4:12 GMT+08:00 Tim Northover via llvm-dev <
llvm-dev at lists.llvm.org>:

> On 9 June 2017 at 12:03, Jajoo, Malhar via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > Is there some way around this ( without suggesting a change to my entire
> AST ) ?
>
> LLVM has its own lightweight dynamic casting infrastructure which the
> Type hierarchy already makes use of.
>
> You have to implement a "classof" function in your DummyType
> definition. That means you'll need a new type ID. Appropriating an
> unused one is slightly dodgy, but probably OK in practice if you're
> careful.
>
> After that you'd write "dyn_cast" instead of "dynamic_cast", since
> that's what the LLVM version is called.
>
> Cheers.
>
> Tim.
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-- 
Wei-Ren Chen (陳韋任)
Homepage: https://people.cs.nctu.edu.tw/~chenwj
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