[ruby-core:75689] Re: [Ruby trunk Bug#12416] struct rb_id_table lacks mark function

On 05/23/2016 05:07 PM, Eric Wong wrote:
> Do you have plans to hold arbitrary VALUE objects?

Yes. I plan to post a feature request with a patch, that has a
hunk to store an array into an rb_id_table.

>> +++ b/iseq.c
>> @@ -128,6 +128,7 @@ rb_iseq_mark(const rb_iseq_t *iseq)
>>  	RUBY_MARK_UNLESS_NULL(compile_data->mark_ary);
>>  	RUBY_MARK_UNLESS_NULL(compile_data->err_info);
>>  	RUBY_MARK_UNLESS_NULL(compile_data->catch_table_ary);
>> +	rb_id_table_mark(compile_data->ivar_cache_table);
> 
> Right now, ivar_cache_table only holds Fixnum which does
> not need marking.   Even with generational GC, I still prefer
> we not waste CPU cycles walking through tables for noops.

OK then, I give up this iseq.c hunk.

Given the ability for this struct to hold GC-managed objects, I
guess it is only a matter of time if someone actually do. People
can use id tables that way now already with a custom mark
function. I think it is a good idea to provide a default one for
them, even if it has no actual usage today.

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