[Type] Can rename py dataclass structs when calling sub functions

[hughperkins]

Issue: #

Brief Summary

Key concept is that we need to store, during compilation:

• the used parameters per func, not just globally
• the relationship between parameters in one func, and in each func that it is calling

We do this in the new pruning.py file, with each dict indexed first by func_id, which is unique per function.

We assume that the parameters used for a func are consistent across all calls to that func within the same compiled kernel. However, different calls to the same kernel can have different used parameters for each func in that kernel call, compared to other calls into the same kernel.

We only need to store the used parameters during the compilation of the kernel. Once the kernel is compiled, we throw away the function-specific lists of parameters - by discarding the ASTTransformer*Context objects - and store only the parametesr needed on entry to the top level kernel. We store these parameters in the Kernel object, indexed by calling key.

Old arch:

New arch:

copilot:summary

Walkthrough

copilot:walkthrough

[duburcqa]

• Make sure we do not call the same func with different template parameters in the same high-level taichi kernel, because this is not supported
• Add proper exception with clean guideline instead of assert for *arg being required to be the last input argument

[hughperkins]

• Make sure we do not call the same func with different template parameters in the same high-level taichi kernel, because this is not supported
• Add proper exception with clean guideline instead of assert for *arg being required to be the last input argument

Addressed both these points.