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LibJS: Convert get_this_binding() to ThrowCompletionOr

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Also add spec step comments to it while we're here.
This commit is contained in:
Linus Groh 2021-10-09 16:52:34 +01:00
parent 4f03138971
commit 0aa24f4ce5
8 changed files with 21 additions and 16 deletions
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15
Userland/Libraries/LibJS/Runtime/FunctionEnvironment.cpp
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@ -65,13 +65,16 @@ bool FunctionEnvironment::has_super_binding() const
}
// 9.1.1.3.4 GetThisBinding ( ), https://tc39.es/ecma262/#sec-function-environment-records-getthisbinding
Value FunctionEnvironment::get_this_binding(GlobalObject& global_object) const
ThrowCompletionOr<Value> FunctionEnvironment::get_this_binding(GlobalObject& global_object) const
{
VERIFY(has_this_binding());
if (this_binding_status() == ThisBindingStatus::Uninitialized) {
vm().throw_exception<ReferenceError>(global_object, ErrorType::ThisHasNotBeenInitialized);
return {};
}
// 1. Assert: envRec.[[ThisBindingStatus]] is not lexical.
VERIFY(m_this_binding_status != ThisBindingStatus::Lexical);
// 2. If envRec.[[ThisBindingStatus]] is uninitialized, throw a ReferenceError exception.
if (m_this_binding_status == ThisBindingStatus::Uninitialized)
return vm().throw_completion<ReferenceError>(global_object, ErrorType::ThisHasNotBeenInitialized);
// 3. Return envRec.[[ThisValue]].
return m_this_value;
}