Our great sponsors
-
-
-
WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Yeah, I know that trick. I implemented an identity hashmap[1] inside of V8 that uses that, because JS objects don't have an identity hash code[2]. It uses the object address as the basis of the hash code, which means the table needs to be reorganized when the GC moves objects, which is done with a post-GC hook. The identity maps in V8 are generally short-lived.
I am not aware of production JVMs that use this, because in the worst case they can use a lot more memory if a lot of objects end up needing hashcodes.
[1] https://github.com/v8/v8/blob/dc712da548c7fb433caed56af9a021...
