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LibJS: Replace Cell live bit with a cell state
So far we only have two states: Live and Dead. In the future, we can add additional states to support incremental sweeping and/or multi- stage cell destruction.
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4 changed files with 32 additions and 20 deletions
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@ -140,7 +140,7 @@ __attribute__((no_sanitize("address"))) void Heap::gather_conservative_roots(Has
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auto* possible_heap_block = HeapBlock::from_cell(reinterpret_cast<const Cell*>(possible_pointer));
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if (all_live_heap_blocks.contains(possible_heap_block)) {
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if (auto* cell = possible_heap_block->cell_from_possible_pointer(possible_pointer)) {
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if (cell->is_live()) {
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if (cell->state() == Cell::State::Live) {
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dbgln_if(HEAP_DEBUG, " ?-> {}", (const void*)cell);
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roots.set(cell);
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} else {
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@ -187,19 +187,17 @@ void Heap::sweep_dead_cells(bool print_report, const Core::ElapsedTimer& measure
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for_each_block([&](auto& block) {
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bool block_has_live_cells = false;
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bool block_was_full = block.is_full();
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block.for_each_cell([&](Cell* cell) {
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if (cell->is_live()) {
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if (!cell->is_marked()) {
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dbgln_if(HEAP_DEBUG, " ~ {}", cell);
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block.deallocate(cell);
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++collected_cells;
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collected_cell_bytes += block.cell_size();
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} else {
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cell->set_marked(false);
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block_has_live_cells = true;
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++live_cells;
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live_cell_bytes += block.cell_size();
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}
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block.template for_each_cell_in_state<Cell::State::Live>([&](Cell* cell) {
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if (!cell->is_marked()) {
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dbgln_if(HEAP_DEBUG, " ~ {}", cell);
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block.deallocate(cell);
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++collected_cells;
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collected_cell_bytes += block.cell_size();
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} else {
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cell->set_marked(false);
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block_has_live_cells = true;
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++live_cells;
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live_cell_bytes += block.cell_size();
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}
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});
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if (!block_has_live_cells)
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