[llvm-dev] I want to update WritingAnLLVMBackend document

[Leslie Zhai via llvm-dev]

您好 Chen :)

I'm the maintainer for LLVM AVR backend wanted to update 
WritingAnLLVMBackend document. My apologies for the delay in responding.

I respect the document's original authors! Sorry for breaking consistent.

At the very beginning: SparcV8 skeleton 
https://github.com/llvm-mirror/llvm/commit/e785e531f4495068ee46cabd926939eec15a565a#diff-6998035da03f58a8c7e0ac3de7d21276

It was very close to the SPARC target example:

- similar constructor's variables

- similar get*Info methods

But the structure of backends and related components often be changed:

- https://reviews.llvm.org/D30879

- https://reviews.llvm.org/D31875

So doc might be out-of-date, but never mind, I can read the source code 
directly :)


在 2017年05月03日 20:36, 陳韋任 写道:
>
> 2017-05-03 17:23 GMT+08:00 Leslie Zhai via llvm-dev 
> <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>:
>
>     Hi LLVM developers,
>
>     As one of the maintainers of AVR target, I want to update
>     WritingAnLLVMBackend document to be familiar with the development
>     of backend, because:
>
>     1. The structure of LLVMTargetMachine
>     https://github.com/llvm-mirror/llvm/blob/master/docs/WritingAnLLVMBackend.rst#target-machine
>     <https://github.com/llvm-mirror/llvm/blob/master/docs/WritingAnLLVMBackend.rst#target-machine>
>     has been changed a lot!
>
>     2. LLVMInitializeSparcTargetInfo
>     https://github.com/llvm-mirror/llvm/blob/master/docs/WritingAnLLVMBackend.rst#target-registration
>     <https://github.com/llvm-mirror/llvm/blob/master/docs/WritingAnLLVMBackend.rst#target-registration>
>     not mentioned the directory structure: TargetInfo/SparcTargetInfo.cpp
>
>     3. There is the Sparc target example in the document, but we could
>     add AVR target as another example
>
>     Please give me some advice, thanks a lot!
>
>
> ​Although contribution always welcome, personally I prefer making the 
> document as consistent as possible.
> I don't know if it's a good idea interleaving different backend 
> implementation
> ​s​
> in
> ​one​
>  document.
>
> ​Anyway, I think you can write a RFC (request for comment)​
> ​
> ​ mail, describing what/where you feel unsatisfied
> about current document, giving a draft to show us how you would 
> improve the document. I think that will make
> the discussion more concrete.
>
> HTH,
> chenwj
>
> -- 
> Wei-Ren Chen (陳韋任)
> Homepage: https://people.cs.nctu.edu.tw/~chenwj 
> <https://people.cs.nctu.edu.tw/%7Echenwj>

-- 
Regards,
Leslie Zhai - a LLVM hacker https://reviews.llvm.org/p/xiangzhai/
Ù)