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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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12
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.cpp
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@ -196,15 +196,21 @@ ThrowCompletionOr<bool> DeclarativeEnvironment::delete_binding(GlobalObject&, Fl
return true;
}
void DeclarativeEnvironment::initialize_or_set_mutable_binding(Badge<ScopeNode>, GlobalObject& global_object, FlyString const& name, Value value)
ThrowCompletionOr<void> DeclarativeEnvironment::initialize_or_set_mutable_binding(GlobalObject& global_object, FlyString const& name, Value value)
{
auto it = m_names.find(name);
VERIFY(it != m_names.end());
auto& binding = m_bindings[it->value];
if (!binding.initialized)
MUST(initialize_binding(global_object, name, value));
TRY(initialize_binding(global_object, name, value));
else
MUST(set_mutable_binding(global_object, name, value, false));
TRY(set_mutable_binding(global_object, name, value, false));
return {};
}
void DeclarativeEnvironment::initialize_or_set_mutable_binding(Badge<ScopeNode>, GlobalObject& global_object, FlyString const& name, Value value)
{
MUST(initialize_or_set_mutable_binding(global_object, name, value));
}
Vector<String> DeclarativeEnvironment::bindings() const