MicroPython Forum (Archive)

Posted: **Mon Feb 07, 2022 5:45 pm**

Forgive my potential ignorance, I'm trying to understand why

vstr_t line

doesn't get swept from the garbage collector? I'm making changes elsewhere in the function and I want to make sure I don't break something.

With the non MICROPY_REPL_EVENT_DRIVEN version of

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pyexec_friendly_repl

I can't see

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vstr_t line

being referenced from a root pointers. As such, why doesn't it get cleaned by the garbage collector?

In the event_driven version it is referenced:

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MP_STATE_VM(repl_line) = vstr_new(32);

Thanks -- I wanted to check before I introduced a bug!

Posted: **Mon Feb 07, 2022 7:45 pm**

Didn't check in detail, but the non-eventdriven version is one big loop hence line is on the stack as long as the program runs and as such doesn't get garbage collected because the mark phase will see it being on the stack?

MicroPython Forum (Archive)

vstr_t line avoiding a sweep from GC in pyexec

vstr_t line avoiding a sweep from GC in pyexec

Re: vstr_t line avoiding a sweep from GC in pyexec