Fix rb_gc_impl_copy_finalizer
#13350
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casperisfine
commented
May 15, 2025
- Add missing VM_LOCK
- Generate a new object_id when copying finalizers
- Dup the finalizer entry so adding a finalizer on a cloned object doesn't impact the source object.
casperisfine
commented
May 15, 2025
| assert_in_out_err(["-e", <<-END], "", %w(:ok :ok :ok :ok), []) | ||
| assert_in_out_err(["-e", <<-END], "", %w(:ok :ok :ok), []) |
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My understanding is that this assertion was incorrect.
- We define 1 finalizer on the source object
- Clone the source object, so 1+1 => 2
- Add another finalizer on the copied object, so 2 + 1 => 3.
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Fix a regression introduced by: ruby#13155
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gc/default/default.c
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| @@ -2832,16 +2835,22 @@ run_final(rb_objspace_t *objspace, VALUE zombie) | |||
| if (FL_TEST_RAW(zombie, FL_FINALIZE)) { | |||
| FL_UNSET(zombie, FL_FINALIZE); | |||
| st_data_t table; | |||
| unsigned int lev = rb_gc_vm_lock(); | |||
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I think we should do the locking in finalize_list instead. We lock the VM in finalize_list to add the slot back to the freelist, so we're just doing locking and unlocking twice for every zombie object instead of once total, which would be bad for performance.
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Good catch, I just had to move the lock up by one line.
The finalizer table can't be read nor modified without the VM lock.
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peterzhu2118
approved these changes
May 16, 2025
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