forked from Imagelibrary/littlefs
fc45af3f6e
stack.py actually already had a simple cycle detector, since we needed
one to calculate stack limits without getting stuck.
Copying this simple cycle detector into the actual table rendering code
lets us print a nice little "cycle detected" message, instead of just
vomiting to stdout forever:
$ ./scripts/stack.py lfs.ci lfs_util.ci -z -s
function frame limit
lfsr_format 320 ∞
|-> lfsr_mountinited 304 ∞
| |-> lfsr_mountmroot 80 ∞
| | |-> lfsr_mountmroot 80 ∞ (cycle detected)
| | |-> lfsr_mdir_lookup 48 576
... snip ...
The cycle detector is a bit naive, just building a new set each step,
but it gets the job done.
As for perf.py and perfbd.py, it turns out they can't actually create
cycles, so no need for a cycle detector. This is good because I didn't
really want to test these scripts again :)