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

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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
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3
Userland/Libraries/LibJS/Heap/Heap.h
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@ -69,6 +69,8 @@ public:
bool should_collect_on_every_allocation() const { return m_should_collect_on_every_allocation; }
void set_should_collect_on_every_allocation(bool b) { m_should_collect_on_every_allocation = b; }
void set_zombify_dead_cells(bool b) { m_zombify_dead_cells = b; }
void did_create_handle(Badge<HandleImpl>, HandleImpl&);
void did_destroy_handle(Badge<HandleImpl>, HandleImpl&);
@ -127,6 +129,7 @@ private:
bool m_should_gc_when_deferral_ends { false };
bool m_collecting_garbage { false };
bool m_zombify_dead_cells { false };
};
}