vmgc

A GC for a VM in Rust

Hopefully eventually for github.com/rubberduckeng/safe_wren

Inspired in part by https://rust-hosted-langs.github.io/book/introduction.html

TODO

• Add tests for various allocation failures.
• Alignment for allocations
• Shrink object header
• Generational collection
• Thread safety
• Provide allocator for Heap?
• Consider making a HandleScope like AutoReleasePool?
• Give examples/docs to make clear which Handle types are nullable vs. not.
• Guidance on the prefered order of LocalHandle vs &LocalHandle vs &HeapHandle as passing types.
• How can we share more code (e.g. is_of_type, try_downcast, etc.) between LocalHandle and HeapHandle?
• Some sort of Guard and Temporary which refers back to a Guard. Could just assert if you try to allocate?
• Map and List are footguns (they can't be easily extended, and you don't want to is_type_of or List depending on your setup) and should be separated out into some sort of easy example.