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aabd82d508
This patch adds FunctionEnvironmentRecord as a subclass of the existing DeclarativeEnvironmentRecord. Things that are specific to function environment records move into there, simplifying the base. Most of the abstract operations related to function environment records are rewritten to match the spec exactly. I also had to implement GetThisEnvironment() and GetSuperConstructor() to keep tests working after the changes, so that's nice as well. :^)
83 lines
2.7 KiB
C++
83 lines
2.7 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/Function.h>
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#include <LibJS/Runtime/FunctionEnvironmentRecord.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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FunctionEnvironmentRecord::FunctionEnvironmentRecord(EnvironmentRecord* parent_scope, HashMap<FlyString, Variable> variables)
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: DeclarativeEnvironmentRecord(variables, parent_scope, DeclarativeEnvironmentRecord::EnvironmentRecordType::Function)
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{
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}
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FunctionEnvironmentRecord::~FunctionEnvironmentRecord()
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{
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}
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void FunctionEnvironmentRecord::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 FunctionEnvironmentRecord::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.is_undefined())
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return js_undefined();
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return home_object.as_object().prototype();
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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 FunctionEnvironmentRecord::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 FunctionEnvironmentRecord::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().is_undefined())
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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 FunctionEnvironmentRecord::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 FunctionEnvironmentRecord::bind_this_value(GlobalObject& global_object, Value this_value)
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{
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VERIFY(has_this_binding());
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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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