Qqwy / roc-bf_example

A simple (and incomplete) example of a BrainFukc interpreter in the Roc programming language.

To run

roc build --optimize ./main.roc
./brainroc ./examples/helloworld.bf

To debug

roc dev ./main.roc -- ./examples/helloworld.bf

which will print dbg statements

Problems

Simple programs like helloworld.bf and print0to999.bf run to completion.

But any longer programs result in a segfault.

When running in debug-mode, the state is printed after each instruction, which contains iter that counts for how many iterations the program has been running. It seems like after 249 iterations, regardless of which program is run(!) the program exits. (249 on roc nightly, 244 on roc from-source, in both cases originating from commit 8d2bcf7) Is this a stack-overflow? If so, that's very weird since unless I'm mistaken, both in the source and when looking at the IR, it seems like the program should tail-recurse correctly.

But maybe it might be the case that the 244 iterations limit only happens when running in dev mode and that the program stopping there does not coincide with the segfault that happens when you do not?