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author | Father Chrysostomos <sprout@cpan.org> | 2013-08-10 16:28:40 -0700 |
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committer | Father Chrysostomos <sprout@cpan.org> | 2013-08-11 07:41:25 -0700 |
commit | 56e04a766185949119c93e963353f9a8712b8ec1 (patch) | |
tree | be9f3be0c5e777ed58ddbbd3633e8730d812a201 /universal.c | |
parent | 53f2736e93810ee2954fb2a08b4d43366caae935 (diff) | |
download | perl-56e04a766185949119c93e963353f9a8712b8ec1.tar.gz |
op.c:ck_svconst: Don’t allow ro COWs under old COW
Under PERL_OLD_COPY_ON_WRITE, allowing COWs to become read-only will
complicate things elsewhere. It uses the IV slot of an SV to point
to a loop of SVs sharing the same buffer. sv_2iv cannot cache the IV
without running the SV through sv_force_normal, but that will croak on
read-only values. I could change it to S_sv_uncow, but there are more
cases elsewhere that would have to be audited, I don’t think it’s
worth spending time on improving PERL_OLD_COPY_ON_WRITE as it’s ‘dead
code, never intended to go live’ according to its author. I am
bothering with at least this much because I don’t want to break it
knowingly.
Diffstat (limited to 'universal.c')
0 files changed, 0 insertions, 0 deletions