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LibJS: Only consider VM-accessible execution contexts as strong roots

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Partially reverts 3dc5f467a8 to fix
GC memory leak that happens because we treated all execution contexts
as strong roots.
This commit is contained in:
Aliaksandr Kalenik
2023-12-13 10:24:30 +01:00
committed by Andreas Kling
parent cbb660c756
commit b108d51c5b
Notes: sideshowbarker 2024-07-17 00:47:29 +09:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/SerenityOS/serenity/commit/b108d51c5b
Pull-request: https://github.com/SerenityOS/serenity/pull/22273
9 changed files with 32 additions and 18 deletions
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26
Userland/Libraries/LibJS/Runtime/VM.cpp
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@@ -153,6 +153,20 @@ Bytecode::Interpreter& VM::bytecode_interpreter()
return *m_bytecode_interpreter;
}
struct ExecutionContextRootsCollector : public Cell::Visitor {
virtual void visit_impl(Cell& cell) override
{
roots.set(&cell);
}
virtual void visit_possible_values(ReadonlyBytes) override
{
VERIFY_NOT_REACHED();
}
HashTable<Cell*> roots;
};
void VM::gather_roots(HashMap<Cell*, HeapRoot>& roots)
{
roots.set(m_empty_string, HeapRoot { .type = HeapRoot::Type::VM });
@@ -169,6 +183,18 @@ void VM::gather_roots(HashMap<Cell*, HeapRoot>& roots)
for (auto finalization_registry : m_finalization_registry_cleanup_jobs)
roots.set(finalization_registry, HeapRoot { .type = HeapRoot::Type::VM });
auto gather_roots_from_execution_context_stack = [&roots](Vector<ExecutionContext*> const& stack) {
for (auto const& execution_context : stack) {
ExecutionContextRootsCollector visitor;
execution_context->visit_edges(visitor);
for (auto* cell : visitor.roots)
roots.set(cell, HeapRoot { .type = HeapRoot::Type::VM });
}
};
gather_roots_from_execution_context_stack(m_execution_context_stack);
for (auto& saved_stack : m_saved_execution_context_stacks)
gather_roots_from_execution_context_stack(saved_stack);
}
ThrowCompletionOr<Value> VM::named_evaluation_if_anonymous_function(ASTNode const& expression, DeprecatedFlyString const& name)