Fix complex hash keys to work with compaction

For example when an array containing objects is a hash key, the contents
of the array may move which can cause the hash value for the array to
change.   This commit makes the default `hash` value based off the
object id, so the hash value will remain stable.

Fixes test/shell/test_command_processor.rb

1 files changed, 5 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index 000c39e178..b4b0415c84 100644
--- a/hash.c
+++ b/hash.c
@@ -272,7 +272,11 @@ rb_objid_hash(st_index_t index)
 static st_index_t
 objid_hash(VALUE obj)
 {
-    return (st_index_t)st_index_hash((st_index_t)obj);
+#if SIZEOF_LONG == SIZEOF_VOIDP
+    return (st_index_t)st_index_hash((st_index_t)NUM2LONG(rb_obj_id(obj)));
+#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
+    return (st_index_t)st_index_hash((st_index_t)NUM2LL(rb_obj_id(obj)));
+#endif
 }
 
 VALUE