Core dump from PyChapel when returning string

[buddha314]

This seems rather "dramatic"...

call.py

import os
from pych.extern import Chapel
currentloc = os.path.dirname(os.path.realpath(__file__))

@Chapel(sfile=os.path.join(currentloc + '/response.chpl'))
def flip_bit():
    return str

if __name__=="__main__":
    w = flip_bit()
    print(w)

and response.chpl

export
proc flip_bit() :string {
  var m : string = "no way";
  return m;
}

Yields the rather impressive error:

> python call.py
Segmentation fault (core dumped)

This is probably the least work I've ever had to do to cause a core dump. Kinda proud of myself right now.

BTW: This was on the way to sending in a string to be manipulated and returned. So that will be my NEXT ticket if you have advice.

[buddha314]

I tried going the other way around, just passing a string in to chpl and I get this error

call.py

import os
from pych.extern import Chapel

currentloc = os.path.dirname(os.path.realpath(__file__))

@Chapel(sfile=os.path.join(currentloc + '/response.chpl'))
def flip_bit(msg=str):
    return None
if __name__=="__main__":
    w = flip_bit('your mama')

with response.chpl

export
proc flip_bit(in msg: string) {
   writeln(msg);
}

producing

> python call.py
/tmp/temp-40P_GZ.chpl:2: error: Out of memory allocating "_ic_these__ref_list_BaseArr"

[lydia-duncan]

Well, I knew returning strings wouldn't be supported, but we should really just error when we don't understand the type instead of reaching that point :(

[lydia-duncan]

Verified that the argument example also gives the same error for me. I tried removing the "in" intent and it ended up freezing my machine for 10-15 minutes before I forcibly rebooted. I intend to try again on a different box to see if I can get it to run to completion or kill it in a kinder manner.

[lydia-duncan]

With the in intent removed from the argument, we still get an out of memory error, but at a different location:
/tmp/temp-wEn84y.chpl:3: error: Cannot allocate memory in channel.write(a:string, b:ioNewline)

Modified response.chpl:

export
proc flip_bit(msg: string) {
  writeln(msg);
}