Stop padlists from being AVs

In order to fix a bug, I need to add new fields to padlists.  But I
cannot easily do that as long as they are AVs.

So I have created a new padlist struct.

This not only allows me to extend the padlist struct with new members
as necessary, but also saves memory, as we now have a three-pointer
struct where before we had a whole SV head (3-4 pointers) + XPVAV (5
pointers).

This will unfortunately break half of CPAN, but the pad API docs
clearly say this:

    NOTE: this function is experimental and may change or be
    removed without notice.

This would have broken B::Debug, but a patch sent upstream has already
been integrated into blead with commit 9d2d23d981.

1 files changed, 1 insertions, 1 deletions

diff --git a/ext/XS-APItest/APItest.xs b/ext/XS-APItest/APItest.xs
index ffe0c43a68..05199208e6 100644
--- a/ext/XS-APItest/APItest.xs
+++ b/ext/XS-APItest/APItest.xs
@@ -3290,7 +3290,7 @@ CV* cv
   AV *pad_namelist;
   AV *retav = newAV();
  CODE:
-  pad_namelist = (AV*) *av_fetch(CvPADLIST(cv), 0, FALSE);
+  pad_namelist = *PADLIST_ARRAY(CvPADLIST(cv));
 
   for ( i = av_len(pad_namelist); i >= 0; i-- ) {
     SV** name_ptr = av_fetch(pad_namelist, i, 0);