Scavenging the Young Generation: How V8 Copies Live Objects in Milliseconds
V8’s scavenger copies live young objects between two semi-spaces with Cheney’s algorithm and promotes survivors by age.
V8
The Write Barrier: How V8 Knows Where a Moved Object Used to Live
V8’s write barrier has four tiers and three jobs: remembering old-to-new references, preserving the tri-colour invariant during marking, and recording slots so a compacting GC can …
Five Kinds of String: How V8 Keeps Strings Cheap
V8 stores strings as sequential, cons, sliced, thin or external representations, so concatenation, slicing and interning can avoid copying characters.
How V8 Gives Every Object a Hidden Class
V8 gives every object a Map that describes its shape, and adding a property walks a tree of Maps shared between all objects with the same history.