Fix a bunch of memory leaks in feature 'class'

 * Free the attrlist OP fragment when applying class or field attribute
 * Free the OP_PADxV ops we only use to get the pad index out for
   fieldvar declarations
 * Add a refcount to the `struct padname_fieldinfo` to keep track of its
   capture in inner closures so it can be freed at the right time
 * Free the class-related fields out of HvAUX
 * Free the actual ObjectFIELDS() array when destroying an object instance
 * Dup fieldinfo->paramname at sv_dup() time / free it at free time

1 files changed, 1 insertions, 0 deletions

diff --git a/pad.h b/pad.h
index 53b27bb3bf..8f339ae6c4 100644
--- a/pad.h
+++ b/pad.h
@@ -94,6 +94,7 @@ struct padname_with_str {
  * own substructure, stored in ->xpadn_fieldinfo.
  */
 struct padname_fieldinfo {
+    U32        refcount;
     PADOFFSET  fieldix;    /* index of this field within ObjectFIELDS() array */
     HV        *fieldstash; /* original class package which added this field */
     OP        *defop;      /* optree fragment for defaulting expression */