Module bf::rts

Minimal run-time system, which does I/O.

In Bendersky's first JIT, the program uses Linux system calls, but that's insufficiently portable. And maybe I could figure out Darwin system calls, but I’d rather not write retry loops anyway. The technique here is from the dynlib-rs tutorial. Instead, we store trait objects in a struct, pass a pointer to that struct to the generated program, and then have the generated program pass the pointer to that struct to the RTS’s read and write functions.

Structs

RtsState

Minimal state for our minimal run-time system.

Constants

OKAY	The object code terminated successfully.
OVERFLOW	The pointer would have pointed above the allocated buffer had the program continued.
UNDERFLOW	The pointer would have pointed below the allocated buffer had the program continued.