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Fix wrong write barrier on fields copy

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Previously this write barrier was using the destination object as the
new parent, rather than the fields object.

Found by wbcheck
This commit is contained in:
John Hawthorn 2025-07-04 11:58:39 -07:00
parent 32453560de
commit 8cd5832694
1 changed files with 1 additions and 1 deletions
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2
variable.c
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@ -2331,7 +2331,7 @@ rb_copy_generic_ivar(VALUE dest, VALUE obj)
new_fields_obj = rb_imemo_fields_new(rb_obj_class(dest), RSHAPE_CAPACITY(dest_shape_id));
VALUE *src_buf = rb_imemo_fields_ptr(fields_obj);
VALUE *dest_buf = rb_imemo_fields_ptr(new_fields_obj);
rb_shape_copy_fields(dest, dest_buf, dest_shape_id, obj, src_buf, src_shape_id);
rb_shape_copy_fields(new_fields_obj, dest_buf, dest_shape_id, obj, src_buf, src_shape_id);
RBASIC_SET_SHAPE_ID(new_fields_obj, dest_shape_id);
RB_VM_LOCKING() {