seq_iter: fix gc issues.

* lib.h (struct seq_iter_ops): New operation, mark.
(seq_iter_ops_init): Default the mark operation to
seq_iter_mark_op.
(seq_iter_ops_init_nomark): New macro.

* lib.c (seq_iter_mark_op): New static function.
(si_range_cnum_ops, si_range_chr_ops, si_rev_range_cnum_ops,
si_rev_range_chr_ops, si_chr_ops): Initialize with
seq_iter_ops_init_nomark so that the iterator has no mark
operation. All other iterator types have the above new static
function as their mark op.
(seq_iter_mark): Simplified: if the iterator has a mark op,
call it.
(seq_next, iter_step): If the iterator has a mark op, that
means that the seq_get operation is likely replacing one heap
object with another, and so mut(iter) must be called to inform
the garbage collector of the assignment.

0 files changed, 0 insertions, 0 deletions