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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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@ -408,10 +408,18 @@ Color Document::visited_link_color() const
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return frame()->page().palette().visited_link();
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}
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static JS::VM& main_thread_vm()
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{
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static RefPtr<JS::VM> vm;
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if (!vm)
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vm = JS::VM::create();
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return *vm;
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}
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JS::Interpreter& Document::interpreter()
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{
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if (!m_interpreter)
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m_interpreter = JS::Interpreter::create<Bindings::WindowObject>(*m_window);
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m_interpreter = JS::Interpreter::create<Bindings::WindowObject>(main_thread_vm(), *m_window);
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return *m_interpreter;
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}
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