Branch: refs/heads/blead
Home: https://github.com/Perl/perl5
Commit: a2b66c25985f6e0bb428250eaa31ef1d288f7785
https://github.com/Perl/perl5/commit/a2b66c25985f6e0bb428250eaa31ef1d288f7785
Author: Tony Cook <t...@develop-help.com>
Date: 2024-03-25 (Mon, 25 Mar 2024)
Changed paths:
M builtin.c
M lib/builtin.t
Log Message:
-----------
prepare_export_lexical: save PL_comppad safely
When the pad being saved and the pad for PL_compcv is the same,
in some cases the actual exports would result in reallocating the
AvARRAY() for the saved PL_comppad.
The LEAVE in finish_export_lexical() would restore the old PL_comppad
(which is fine) and the pre-reallocation PL_curpad (which isn't fine).
This would later panic.
SAVECOMPPAD; restores PL_comppad on LEAVE and then restores PL_curpad
from PL_comppad, preventing the desync between those values.
It's unclear to me why only the save_BEGINs; causes this, but the fix
does fix a real problem and prevents the panics that I'm aware of
here.
Fixes #21981
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