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LibJS: Implement basic conservative garbage collection

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We now scan the stack and CPU registers for potential pointers into the
GC heap, and include any valid Cell pointers in the set of roots.

This works pretty well but we'll also need to solve marking of things
passed to native functions, since those are currently in Vector<Value>
and the Vector storage is on the heap (not scanned.)
This commit is contained in:
Andreas Kling 2020-03-16 19:08:59 +01:00
parent ad92a1e4bc
commit ab404a2f88
3 changed files with 81 additions and 2 deletions
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3
Libraries/LibJS/Heap/Heap.h
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@ -59,9 +59,12 @@ private:
Cell* allocate_cell(size_t);
void gather_roots(HashTable<Cell*>&);
void gather_conservative_roots(HashTable<Cell*>&);
void mark_live_cells(const HashTable<Cell*>& live_cells);
void sweep_dead_cells();
Cell* cell_from_possible_pointer(FlatPtr);
Interpreter& m_interpreter;
Vector<NonnullOwnPtr<HeapBlock>> m_blocks;
};