0ff29349e6
This change introduces a very basic GC graph dumper. The `dump_graph()`
function outputs JSON data that contains information about all nodes in
the graph, including their class types and edges.
Root nodes will have a property indicating their root type or source
location if the root is captured by a SafeFunction. It would be useful
to add source location for other types of roots in the future.
Output JSON dump have following format:
```json
"4908721208": {
"class_name": "Accessor",
"edges": [
"4909298232",
"4909297976"
]
},
"4907520440": {
"root": "SafeFunction Optional Optional.h:137",
"class_name": "Realm",
"edges": [
"4908269624",
"4924821560",
"4908409240",
"4908483960",
"4924527672"
]
},
"4908251320": {
"class_name": "CSSStyleRule",
"edges": [
"4908302648",
"4925101656",
"4908251192"
]
},
```
81 lines
2 KiB
C++
81 lines
2 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/HashMap.h>
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#include <AK/IntrusiveList.h>
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#include <AK/Vector.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Heap/HeapRootTypeOrLocation.h>
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namespace JS {
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class MarkedVectorBase {
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public:
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virtual void gather_roots(HashMap<Cell*, JS::HeapRootTypeOrLocation>&) const = 0;
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protected:
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explicit MarkedVectorBase(Heap&);
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~MarkedVectorBase();
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MarkedVectorBase& operator=(MarkedVectorBase const&);
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Heap* m_heap { nullptr };
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IntrusiveListNode<MarkedVectorBase> m_list_node;
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public:
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using List = IntrusiveList<&MarkedVectorBase::m_list_node>;
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};
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template<typename T, size_t inline_capacity>
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class MarkedVector final
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: public MarkedVectorBase
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, public Vector<T, inline_capacity> {
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public:
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explicit MarkedVector(Heap& heap)
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: MarkedVectorBase(heap)
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{
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}
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virtual ~MarkedVector() = default;
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MarkedVector(MarkedVector const& other)
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: MarkedVectorBase(*other.m_heap)
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, Vector<T, inline_capacity>(other)
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{
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}
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MarkedVector(MarkedVector&& other)
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: MarkedVectorBase(*other.m_heap)
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, Vector<T, inline_capacity>(move(static_cast<Vector<T, inline_capacity>&>(other)))
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{
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}
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MarkedVector& operator=(MarkedVector const& other)
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{
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Vector<T, inline_capacity>::operator=(other);
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MarkedVectorBase::operator=(other);
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return *this;
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}
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virtual void gather_roots(HashMap<Cell*, JS::HeapRootTypeOrLocation>& roots) const override
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{
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for (auto& value : *this) {
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if constexpr (IsSame<Value, T>) {
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if (value.is_cell())
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roots.set(&const_cast<T&>(value).as_cell(), HeapRootType::MarkedVector);
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} else {
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roots.set(value, HeapRootType::MarkedVector);
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}
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}
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}
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};
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}
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