nobu	2019-03-09 09:00:26 +0900 (Sat, 09 Mar 2019)

  New Revision: 67195

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=67195

  Log:
    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 Naud?\195?\169 <lourens@b...>

  Modified files:
    trunk/gc.c
Index: gc.c
===================================================================
--- gc.c	(revision 67194)
+++ gc.c	(revision 67195)
@@ -4694,6 +4694,13 @@ gc_mark_children(rb_objspace_t *objspace https://github.com/ruby/ruby/blob/trunk/gc.c#L4694
     }
 
     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 https://github.com/ruby/ruby/blob/trunk/gc.c#L4812
         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) {

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