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LibJS: More properly implement scoping rules in bytecode codegen

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Now we emit CreateVariable and SetVariable with the appropriate
initialization/environment modes, much closer to the spec.
This makes a whole lot of things like let/const variables, function
and variable hoisting and some other things work :^)
This commit is contained in:
Ali Mohammad Pur 2022-02-12 19:48:45 +03:30 • committed by Linus Groh
parent c7e6b65fd2
commit 1bbfaf8627
12 changed files with 503 additions and 38 deletions
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4
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@ -67,7 +67,7 @@ Interpreter::ValueAndFrame Interpreter::run_and_return_frame(Executable const& e
if (!m_manually_entered_frames.is_empty() && m_manually_entered_frames.last()) {
m_register_windows.append(make<RegisterWindow>(m_register_windows.last()));
} else {
m_register_windows.append(make<RegisterWindow>());
m_register_windows.append(make<RegisterWindow>(MarkedVector<Value>(vm().heap()), MarkedVector<Environment*>(vm().heap()), MarkedVector<Environment*>(vm().heap())));
}
registers().resize(executable.number_of_registers);
@ -150,7 +150,7 @@ Interpreter::ValueAndFrame Interpreter::run_and_return_frame(Executable const& e
// NOTE: The return value from a called function is put into $0 in the caller context.
if (!m_register_windows.is_empty())
m_register_windows.last()[0] = return_value;
m_register_windows.last().registers[0] = return_value;
// At this point we may have already run any queued promise jobs via on_call_stack_emptied,
// in which case this is a no-op.