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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.
This commit is contained in:
Andreas Kling 2021-09-11 16:44:40 +02:00
parent 57371f7608
commit c364520c24
10 changed files with 33 additions and 1 deletions

View file

@ -24,9 +24,12 @@ public:
bool is_marked() const { return m_mark; }
void set_marked(bool b) { m_mark = b; }
virtual void did_become_zombie() { }
enum class State {
Live,
Dead,
Zombie,
};
State state() const { return m_state; }