Mirror of forum.nim-lang.org

7683 :: Manually initializing exception handling

• vitreo12 (orginal) [2021-03-22T20:35:22+01:00] view original

  Hello everyone!

  I am trying to use Nim's try / raise / except in a shared library, but it crashes.

  My hunch is that I must initialize it somehow. Is there a manual way to initialize it?

  Thanks!

---

• ynfle (orginal) [2021-03-22T23:49:00+01:00] view original

  I don't think you can use seq with --gc:none, it's a GC'ed type

---

• vitreo12 (orginal) [2021-03-23T00:00:55+01:00] view original

  I know that, but since it is coming from the exception handler, I thought maybe there was a way to use custom memory with that, by initializing it somehow.

---

• leorize (orginal) [2021-03-23T00:21:45+01:00] view original

  You should call NimMain(), which will initialize the GC (yes, --gc:none's seq/string still uses the GC, even if the GC doesn't collect).

  Alternatively you can use --gc:arc or --gc:orc instead.

---

• vitreo12 (orginal) [2021-03-23T01:03:26+01:00] view original

  That was what I assumed, thanks!

  For others that eventually might be having the same problem, I ended up wrapping C's setjmp and longjmp to implement a very basic custom try / except behavior.

---

• Araq (orginal) [2021-03-23T09:19:46+01:00] view original

  You also should try -d:noSignalHandler which removes the exception seq handling code altogether.

---

• vitreo12 (orginal) [2021-03-23T11:48:38+01:00] view original

  Thanks a lot! I'll give it a go :)

---