https://git.ruby-lang.org/ruby.git/commit/?id=ea3e7e2685

From ea3e7e268546599883b25d9a33d26e042461ac25 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Fri, 17 May 2019 17:08:31 +0300
Subject: Prevent Dynamic -> Static symbols from moving

If a dynamic symbol has been converted to a static symbol, it gets added
to the global ID list and should no longer move.  C extensions can pass
symbols to rb_sym2id and those symbols should no longer be movable.
When the symbol is passed to rb_sym2id, the `id` member is set, so we
can use its existence to prevent movement.

diff --git a/gc.c b/gc.c
index f344bb8..bf495ba 100644
--- a/gc.c
+++ b/gc.c
@@ -7256,6 +7256,10 @@ gc_is_moveable_obj(rb_objspace_t *objspace, VALUE obj) https://github.com/ruby/ruby/blob/trunk/gc.c#L7256
         case T_ZOMBIE:
             return FALSE;
             break;
+        case T_SYMBOL:
+            if (DYNAMIC_SYM_P(obj) && (RSYMBOL(obj)->id & ~ID_SCOPE_MASK)) {
+                return FALSE;
+            }
         case T_STRING:
         case T_OBJECT:
         case T_FLOAT:
@@ -7266,7 +7270,6 @@ gc_is_moveable_obj(rb_objspace_t *objspace, VALUE obj) https://github.com/ruby/ruby/blob/trunk/gc.c#L7270
         case T_MODULE:
         case T_REGEXP:
         case T_DATA:
-        case T_SYMBOL:
         case T_MATCH:
         case T_STRUCT:
         case T_HASH:
-- 
cgit v0.10.2


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