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Fix missing write barrier through M_TBL

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When creating a new origin in ensure_origin, we need to fire a write
barrier after RCLASS_WRITE_ORIGIN. rb_class_set_super allocates, so GC
could happen there, either incrementally marking or promoting the newly
allocated class, and only after RCLASS_WRITE_ORIGIN will origin mark
object in the M_TBL.
This commit is contained in:
John Hawthorn 2025-06-09 11:26:49 -07:00
parent 54a578e72a
commit d67eb07f75
1 changed files with 5 additions and 0 deletions
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5
class.c
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@ -1931,6 +1931,11 @@ ensure_origin(VALUE klass)
rb_class_set_super(origin, RCLASS_SUPER(klass));
rb_class_set_super(klass, origin); // writes origin into RCLASS_SUPER(klass)
RCLASS_WRITE_ORIGIN(klass, origin);
// RCLASS_WRITE_ORIGIN marks origin as an origin, so this is the first
// point that it sees M_TBL and may mark it
rb_gc_writebarrier_remember(origin);
class_clear_method_table(klass);
rb_id_table_foreach(RCLASS_M_TBL(origin), cache_clear_refined_method, (void *)klass);
rb_id_table_foreach(RCLASS_M_TBL(origin), move_refined_method, (void *)klass);