fe9dc47320
As the name implies (and the spec confirms), this is only ever going to be an object or "nothing", or "undefined" in the spec. By taking this literally and updating a check to check for `is_undefined()`, we introduced a bug - the value was still initialized as an empty value. Instead, use a pointer to an Object - either we have one, or we don't. Fixes #8448.
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/FunctionEnvironment.h>
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#include <LibJS/Runtime/FunctionObject.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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FunctionEnvironment::FunctionEnvironment(Environment* parent_scope, HashMap<FlyString, Variable> variables)
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: DeclarativeEnvironment(variables, parent_scope)
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{
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}
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FunctionEnvironment::~FunctionEnvironment()
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{
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}
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void FunctionEnvironment::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_this_value);
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visitor.visit(m_new_target);
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visitor.visit(m_function_object);
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}
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// 9.1.1.3.5 GetSuperBase ( ), https://tc39.es/ecma262/#sec-getsuperbase
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Value FunctionEnvironment::get_super_base() const
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{
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VERIFY(m_function_object);
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auto home_object = m_function_object->home_object();
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if (!home_object)
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return js_undefined();
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return home_object->internal_get_prototype_of();
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}
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// 9.1.1.3.2 HasThisBinding ( ), https://tc39.es/ecma262/#sec-function-environment-records-hasthisbinding
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bool FunctionEnvironment::has_this_binding() const
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{
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if (this_binding_status() == ThisBindingStatus::Lexical)
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return false;
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return true;
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}
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// 9.1.1.3.3 HasSuperBinding ( ), https://tc39.es/ecma262/#sec-function-environment-records-hassuperbinding
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bool FunctionEnvironment::has_super_binding() const
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{
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if (this_binding_status() == ThisBindingStatus::Lexical)
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return false;
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if (!function_object().home_object())
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return false;
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return true;
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}
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// 9.1.1.3.4 GetThisBinding ( ), https://tc39.es/ecma262/#sec-function-environment-records-getthisbinding
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Value FunctionEnvironment::get_this_binding(GlobalObject& global_object) const
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{
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VERIFY(has_this_binding());
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if (this_binding_status() == ThisBindingStatus::Uninitialized) {
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vm().throw_exception<ReferenceError>(global_object, ErrorType::ThisHasNotBeenInitialized);
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return {};
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}
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return m_this_value;
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}
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// 9.1.1.3.1 BindThisValue ( V ), https://tc39.es/ecma262/#sec-bindthisvalue
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Value FunctionEnvironment::bind_this_value(GlobalObject& global_object, Value this_value)
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{
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VERIFY(this_binding_status() != ThisBindingStatus::Lexical);
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if (this_binding_status() == ThisBindingStatus::Initialized) {
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vm().throw_exception<ReferenceError>(global_object, ErrorType::ThisIsAlreadyInitialized);
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return {};
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}
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m_this_value = this_value;
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m_this_binding_status = ThisBindingStatus::Initialized;
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return this_value;
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}
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}
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