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LibJS: Notify WeakSets when heap cells are sweeped

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This is an implementation of the following optional optimization:
https://tc39.es/ecma262/#sec-weakref-execution
This commit is contained in:
Idan Horowitz 2021-06-09 20:10:47 +03:00 • committed by Linus Groh
parent fb63aeae4d
commit a00d154522
7 changed files with 62 additions and 3 deletions
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20
Userland/Libraries/LibJS/Heap/Heap.cpp
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@ -16,6 +16,7 @@
#include <LibJS/Heap/HeapBlock.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/WeakSet.h>
#include <setjmp.h>
namespace JS {
@ -182,18 +183,22 @@ void Heap::sweep_dead_cells(bool print_report, const Core::ElapsedTimer& measure
dbgln_if(HEAP_DEBUG, "sweep_dead_cells:");
Vector<HeapBlock*, 32> empty_blocks;
Vector<HeapBlock*, 32> full_blocks_that_became_usable;
Vector<Cell*> sweeped_cells;
size_t collected_cells = 0;
size_t live_cells = 0;
size_t collected_cell_bytes = 0;
size_t live_cell_bytes = 0;
auto should_store_sweeped_cells = !m_weak_sets.is_empty();
for_each_block([&](auto& block) {
bool block_has_live_cells = false;
bool block_was_full = block.is_full();
block.template for_each_cell_in_state<Cell::State::Live>([&](Cell* cell) {
if (!cell->is_marked()) {
dbgln_if(HEAP_DEBUG, " ~ {}", cell);
if (should_store_sweeped_cells)
sweeped_cells.append(cell);
block.deallocate(cell);
++collected_cells;
collected_cell_bytes += block.cell_size();
@ -221,6 +226,9 @@ void Heap::sweep_dead_cells(bool print_report, const Core::ElapsedTimer& measure
allocator_for_size(block->cell_size()).block_did_become_usable({}, *block);
}
for (auto* weak_set : m_weak_sets)
weak_set->remove_sweeped_cells({}, sweeped_cells);
if constexpr (HEAP_DEBUG) {
for_each_block([&](auto& block) {
dbgln(" > Live HeapBlock @ {}: cell_size={}", &block, block.cell_size());
@ -272,6 +280,18 @@ void Heap::did_destroy_marked_value_list(Badge<MarkedValueList>, MarkedValueList
m_marked_value_lists.remove(&list);
}
void Heap::did_create_weak_set(Badge<WeakSet>, WeakSet& set)
{
VERIFY(!m_weak_sets.contains(&set));
m_weak_sets.set(&set);
}
void Heap::did_destroy_weak_set(Badge<WeakSet>, WeakSet& set)
{
VERIFY(m_weak_sets.contains(&set));
m_weak_sets.remove(&set);
}
void Heap::defer_gc(Badge<DeferGC>)
{
++m_gc_deferrals;