RGBCube/serenity
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3 commits

Author SHA1 Message Date
Andreas Kling
05c80cac20 LibJS: Make the GC marking phase cycle-proof 
Don't visit cells that are already marked. This prevents the marking
phase from looping forever when two cells refer to each other.

Also do the marking directly from the CellVisitor, removing another
unnecessary phase of the collector. :^)
 2020-03-09 22:18:03 +01:00
Stephan Unverwerth
1207187e97 LibJS: GC: Remove clear_all_mark_bits() 
Clearing all marked flags has been integrated into the sweep function,
saving an additional full iteration over the heap.
 2020-03-09 07:32:09 +01:00
Andreas Kling
63e4b744ed LibJS: Add a basic mark&sweep garbage collector :^) 
Objects can now be allocated via the interpreter's heap. Objects that
are allocated in this way will need to be provably reachable from at
least one of the known object graph roots.

The roots are currently determined by Heap::collect_roots().

Anything that wants be collectable garbage should inherit from Cell,
the fundamental atom of the GC heap.

This is pretty neat! :^)
 2020-03-08 19:23:58 +01:00