Early return in gc_mark_children

for types Float, Bignum and Symbol as they do not have references
and singleton classes.

[Fix GH-2091]

From: Lourens Naudé <lourens@bearmetal.eu>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67195 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 5 deletions

diff --git a/gc.c b/gc.c
index 9f6dd75400..1331ef21dc 100644
--- a/gc.c
+++ b/gc.c
@@ -4694,6 +4694,13 @@ gc_mark_children(rb_objspace_t *objspace, VALUE obj)
     }
 
     switch (BUILTIN_TYPE(obj)) {
+      case T_FLOAT:
+      case T_BIGNUM:
+      case T_SYMBOL:
+        /* Not immediates, but does not have references and singleton
+         * class */
+        return;
+
       case T_NIL:
       case T_FIXNUM:
 	rb_bug("rb_gc_mark() called for broken object");
@@ -4805,11 +4812,6 @@ gc_mark_children(rb_objspace_t *objspace, VALUE obj)
         gc_mark(objspace, any->as.regexp.src);
 	break;
 
-      case T_FLOAT:
-      case T_BIGNUM:
-      case T_SYMBOL:
-	break;
-
       case T_MATCH:
 	gc_mark(objspace, any->as.match.regexp);
 	if (any->as.match.str) {