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LibJS+Clients: Add JS::VM object, separate Heap from Interpreter
Taking a big step towards a world of multiple global object, this patch adds a new JS::VM object that houses the JS::Heap. This means that the Heap moves out of Interpreter, and the same Heap can now be used by multiple Interpreters, and can also outlive them. The VM keeps a stack of Interpreter pointers. We push/pop on this stack when entering/exiting execution with a given Interpreter. This allows us to make this change without disturbing too much of the existing code. There is still a 1-to-1 relationship between Interpreter and the global object. This will change in the future. Ultimately, the goal here is to make Interpreter a transient object that only needs to exist while you execute some code. Getting there will take a lot more work though. :^) Note that in LibWeb, the global JS::VM is called main_thread_vm(), to distinguish it from future worker VM's.
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13 changed files with 218 additions and 27 deletions
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@ -43,7 +43,7 @@ class 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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explicit Heap(VM&);
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~Heap();
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template<typename T, typename... Args>
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@ -71,7 +71,8 @@ public:
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void collect_garbage(CollectionType = CollectionType::CollectGarbage, bool print_report = false);
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Interpreter& interpreter() { return m_interpreter; }
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Interpreter& interpreter();
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VM& vm() { return m_vm; }
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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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@ -100,7 +101,7 @@ private:
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bool m_should_collect_on_every_allocation { false };
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Interpreter& m_interpreter;
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VM& m_vm;
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Vector<NonnullOwnPtr<HeapBlock>> m_blocks;
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HashTable<HandleImpl*> m_handles;
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