When is an opcode's ->seq empty?
In [cpan://B::Utils]::parent I read that Simon is not sure how to find the parent of nodes where ->seq is false. When does this happen?
sub B::OP::parent {
my $target = shift;
die "I'm not sure how to do this yet. I'm sure there is a way. If you know, please email me."
if (!$target->seq);
...
Re: When is an opcode's ->seq empty?
created: 2004-06-14 16:53:24
Some source code reading revealed the answer. I thought that this was a deeper thing than it is. op_seq is zero before the peep-hole optimizer runs on some code and non-zero afterwards as a flag to prevent the optimizer from running again.
I now wonder how Simon got a handle to some code before the optimizer took hold of it. Hmm...