[llvm-dev] Extending TableGen's 'foreach' to work with 'multiclass' and 'defm'

[Matthias Braun via llvm-dev]

For what it's worth: I also had very good experiences with python "specifications" to generate code [1].

Of course it's hard to justify switching all the infrastructure just because of one missing tablegen feature...

- Matthias

[1] Example spec + template: https://github.com/libfirm/libfirm/blob/master/scripts/ir_spec.py <https://github.com/libfirm/libfirm/blob/master/scripts/ir_spec.py>
  https://github.com/libfirm/libfirm/blob/master/scripts/templates/gen_irio.c

> On Aug 23, 2017, at 9:35 AM, Jakob Stoklund Olesen via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> 
>> On Aug 22, 2017, at 14:15, Hal Finkel via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>> 
>> For situations well beyond TableGen's current language capabilities, we have a decision to make. We can continue extending TableGen until it can meet those needs. Alternatively, we can enable the use of some more-powerful input language. For example, we could allow TableGen to embed Python, and then use Python in order to generate record definitions.
> 
> For a project that’s not LLVM, I recently had the opportunity to replace both TableGen and *.td files with Python scripts. I found that TableGen’s features were easily matched by Python’s for loops and the ability to define functions. I am pretty happy with the approach so far. AMA
> 
> This is a lot easier to do in a green field project than in an old project like LLVM, of course.
> 
> Example “.td” file: https://github.com/stoklund/cretonne/blob/master/lib/cretonne/meta/isa/riscv/encodings.py <https://github.com/stoklund/cretonne/blob/master/lib/cretonne/meta/isa/riscv/encodings.py>
> 
> Thanks,
> /jakob
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