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LibJS: Don't directly teach the heap about the javascript VM or Realm

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Instead, smuggle it in as a `void*` private data and let Javascript
aware code cast out that pointer to a VM&.

In order to make this split, rename JS::Cell to JS::CellImpl. Once we
have a LibGC, this will become GC::Cell. CellImpl then has no specific
knowledge of the VM& and Realm&. That knowledge is instead put into
JS::Cell, which inherits from CellImpl. JS::Cell is responsible for
JavaScript's realm initialization, as well as converting of the void*
private data to what it knows should be the VM&.
This commit is contained in:
Shannon Booth 2024-11-14 20:22:33 +13:00 • committed by Andreas Kling
commit c2988a7dd5
Notes: github-actions[bot] 2024-11-14 14:39:37 +00:00
27 changed files with 346 additions and 296 deletions
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8
Libraries/LibJS/Runtime/VM.cpp
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@ -62,7 +62,7 @@ static constexpr auto make_single_ascii_character_strings(IndexSequence<code_poi
static constexpr auto single_ascii_character_strings = make_single_ascii_character_strings(MakeIndexSequence<128>());
VM::VM(OwnPtr<CustomData> custom_data, ErrorMessages error_messages)
: m_heap(*this, [this](HashMap<Cell*, JS::HeapRoot>& roots) {
: m_heap(this, [this](HashMap<CellImpl*, JS::HeapRoot>& roots) {
gather_roots(roots);
})
, m_error_messages(move(error_messages))
@ -204,7 +204,7 @@ Bytecode::Interpreter& VM::bytecode_interpreter()
}
struct ExecutionContextRootsCollector : public Cell::Visitor {
virtual void visit_impl(Cell& cell) override
virtual void visit_impl(CellImpl& cell) override
{
roots.set(&cell);
}
@ -214,10 +214,10 @@ struct ExecutionContextRootsCollector : public Cell::Visitor {
VERIFY_NOT_REACHED();
}
HashTable<GCPtr<Cell>> roots;
HashTable<GCPtr<CellImpl>> roots;
};
void VM::gather_roots(HashMap<Cell*, HeapRoot>& roots)
void VM::gather_roots(HashMap<CellImpl*, HeapRoot>& roots)
{
roots.set(m_empty_string, HeapRoot { .type = HeapRoot::Type::VM });
for (auto string : m_single_ascii_character_strings)