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Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 31 |
1 files changed, 31 insertions, 0 deletions
@@ -1,5 +1,36 @@ 2014-10-21 Kaz Kylheku <kaz@kylheku.com> + Ensure that a hash reorganization doesn't take place + during a traversal, which could cause items to be visited + twice or skipped. + + * gc.c (full_gc): Changed from static to exter (full_gc): Changed to + internal linkage. + + * gc.h (full_gc): Declared. + + * hash.c (struct hash): New member, usecount. + (struct hash_iter): New member, next. + (reachable_iters): New static variable. + (hash_mark): Reset the usecount of every reachable hash table. + (hash_iter_mark): Add every reachable iterator to reachable_iters + list. + (make_hash, make_similar_hash, copy_hash): Initialize usecount. + (gethash_c): Do not call hash_grow if usecount is nonzero. + (hash_begin): Initialize next field of hash_iter to null. + Increment use count on hash table. + (hash_next): When traversal ends, release use count, and + null out the hash table reference. + (do_weak_tables): New static function. + (do_iters): New static function. + (hash_process_weak): Weak hash processing logic moved + to do_weak_tables. Also calls do_iters. + + * txr.1: Describe hash table traversal, and the assurances + and caveats about inserting and deleting items. + +2014-10-21 Kaz Kylheku <kaz@kylheku.com> + * eval.c (interp_fun): If the function doesn't have specials, then don't bother saving and restoring dynamic env around the argument binding and evaluation. |