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LibJS: Protect function call "this" and arguments from GC

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This patch adds a CallFrame stack to Interpreter, which keeps track of
the "this" value and all argument values passed in function calls.

Interpreter::gather_roots() scans the call stack, making sure that all
argument values get marked. :^)
This commit is contained in:
Andreas Kling
2020-03-17 11:00:09 +01:00
parent 666f84b933
commit bf9912cc59
3 changed files with 22 additions and 19 deletions
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10
Libraries/LibJS/Interpreter.cpp
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@@ -151,9 +151,13 @@ void Interpreter::gather_roots(Badge<Heap>, HashTable<Cell*>& roots)
}
}
for (auto& this_value : m_this_stack) {
if (this_value.is_cell())
roots.set(this_value.as_cell());
for (auto& call_frame : m_call_stack) {
if (call_frame.this_value.is_cell())
roots.set(call_frame.this_value.as_cell());
for (auto& argument : call_frame.arguments) {
if (argument.is_cell())
roots.set(argument.as_cell());
}
}
}