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Postings from February 2012
Father Chrysostomos via RT wrote:
>As of commit d164302a58, the constant gets copied under threads+mad, so
>the 'no Lexical::Var' doesn't work, as \$foo is no longer returning a
>reference to the same scalar that Lexical::Var tried to make it return.
Sounds like it's more fundamentally broken if \$foo doesn't give a
consistent result. I'll add that to the test suite.
>Then again, why does it need to be marked PADTMP? If it's marked
>PADTMP, it means that taking a reference to it will copy it. Isn't the
>readonliness sufficient?
Readonliness should be sufficient. I think we can skip the copying in
that case.
>Why cannot XS modules create ops that return specific scalars?
They can, but it takes two ops: const yielding an RV, and rv2sv to get to
the specific scalar. The RV can be pushed, shoved, copied, and so on,
without breaking the effect. L:V does this in the non-readonly case.
Guess I'll have to extend that to the readonly case on problematic Perls,
but then it won't get to take part in constant folding. Sigh.
> && cSVOPo->op_sv == &PL_sv_undef) {
Bah. I'll have to special-case that.
-zefram
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