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https://github.com/RGBCube/serenity
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b2f005125d
When the Heap is going down, it's our last chance to run destructors, so add a separate collector mode where we simply skip over the marking phase and go directly to sweeping. This causes everything to get swept and all live cells get destroyed. This way, valgrind reports 0 leaks on exit. :^)
88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/HashTable.h>
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#include <AK/Noncopyable.h>
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#include <AK/NonnullOwnPtr.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Heap/Handle.h>
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#include <LibJS/Runtime/Cell.h>
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namespace JS {
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class Heap {
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AK_MAKE_NONCOPYABLE(Heap);
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AK_MAKE_NONMOVABLE(Heap);
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public:
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explicit Heap(Interpreter&);
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~Heap();
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template<typename T, typename... Args>
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T* allocate(Args&&... args)
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{
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auto* memory = allocate_cell(sizeof(T));
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new (memory) T(forward<Args>(args)...);
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return static_cast<T*>(memory);
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}
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enum class CollectionType {
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CollectGarbage,
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CollectEverything,
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};
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void collect_garbage(CollectionType = CollectionType::CollectGarbage);
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Interpreter& interpreter() { return m_interpreter; }
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bool should_collect_on_every_allocation() const { return m_should_collect_on_every_allocation; }
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void set_should_collect_on_every_allocation(bool b) { m_should_collect_on_every_allocation = b; }
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void did_create_handle(Badge<HandleImpl>, HandleImpl&);
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void did_destroy_handle(Badge<HandleImpl>, HandleImpl&);
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private:
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Cell* allocate_cell(size_t);
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void gather_roots(HashTable<Cell*>&);
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void gather_conservative_roots(HashTable<Cell*>&);
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void mark_live_cells(const HashTable<Cell*>& live_cells);
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void sweep_dead_cells();
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Cell* cell_from_possible_pointer(FlatPtr);
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bool m_should_collect_on_every_allocation { false };
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Interpreter& m_interpreter;
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Vector<NonnullOwnPtr<HeapBlock>> m_blocks;
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HashTable<HandleImpl*> m_handles;
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};
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}
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