selfie VS swieros

this sort of exists at https://github.com/cksystemsteaching/selfie

> Selfie is a self-contained 64-bit, 12KLOC C implementation of: (...) a tiny (...) subset of C called C Star (C) (...) to a tiny (...) subset of RISC-V called RISC-U[;] a[n] (...) emulator (...) that executes RISC-U code[;] (...) a (...) hypervisor (...) that provides RISC-U virtual machines*

so they have an instruction set architecture, a compiler, and an operating system, though it's much simpler than xv6. because the instruction set is a subset of risc-v you can run its code on actual risc-v hardware (or qemu-system-riscv), but presumably you could also design risc-u hardware in verilog that was simpler than a full implementation of rv64i with whatever extensions the hypervisor needs

There's a very interesting C interpreter/compiler there as well [1]. From the header:

"c is the c compiler. It takes a single source file and creates an executable file or else executes the compiled code immediately. The compiler does not reach full standards compliance, so some programs need minor adjustment.

There is no preprocessor, although the #include keyword is allowed supporting a single level of file inclusion."

[1] https://github.com/rswier/swieros/blob/master/root/bin/c.c

swierosc