How does HCL interact with C/C++ and DSLs

[0xB4demeister]

Hi,
I was reviewing the code and wondering, how the current hcl dialect interacts with the C/C++ and PyTorch/Tensorflow flow from ScaleHLS.
As I am new to MLIR and there are currently no tutorials/code examples, I couldnt fully understand, if HeteroCL simply supports
C/C++ and these DSLs due to MLIR or if you can apply optimization specifications,.. for functions specified in C/C++,...
Thanks for your help in advance.