Andreas Kling c364520c24 LibJS+js+test-js: Add GC debug mode that keeps cells "alive" as zombies ...

This patch adds a `-z` option to js and test-js. When run in this mode,
garbage cells are never actually destroyed. We instead keep them around
in a special zombie state.

This allows us to validate that zombies don't get marked in future GC
scans (since there were not supposed to be any more references!) :^)

Cells get notified when they become a zombie (via did_become_zombie())
and this is used by WeakContainer cells to deregister themselves from
the heap.

2021-09-11 16:52:03 +02:00

6.3 KiB

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