119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
/*
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* Copyright (c) 2020-2021, 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/DeclarativeEnvironmentRecord.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/Function.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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DeclarativeEnvironmentRecord::DeclarativeEnvironmentRecord()
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: EnvironmentRecord(nullptr)
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{
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}
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DeclarativeEnvironmentRecord::DeclarativeEnvironmentRecord(EnvironmentRecordType environment_record_type)
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: EnvironmentRecord(nullptr)
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, m_environment_record_type(environment_record_type)
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{
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}
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DeclarativeEnvironmentRecord::DeclarativeEnvironmentRecord(HashMap<FlyString, Variable> variables, EnvironmentRecord* parent_scope)
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: EnvironmentRecord(parent_scope)
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, m_variables(move(variables))
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{
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}
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DeclarativeEnvironmentRecord::DeclarativeEnvironmentRecord(HashMap<FlyString, Variable> variables, EnvironmentRecord* parent_scope, EnvironmentRecordType environment_record_type)
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: EnvironmentRecord(parent_scope)
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, m_environment_record_type(environment_record_type)
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, m_variables(move(variables))
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{
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}
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DeclarativeEnvironmentRecord::~DeclarativeEnvironmentRecord()
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{
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}
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void DeclarativeEnvironmentRecord::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_home_object);
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visitor.visit(m_new_target);
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visitor.visit(m_current_function);
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for (auto& it : m_variables)
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visitor.visit(it.value.value);
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}
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Optional<Variable> DeclarativeEnvironmentRecord::get_from_scope(FlyString const& name) const
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{
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return m_variables.get(name);
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}
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void DeclarativeEnvironmentRecord::put_to_scope(FlyString const& name, Variable variable)
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{
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m_variables.set(name, variable);
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}
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bool DeclarativeEnvironmentRecord::delete_from_scope(FlyString const& name)
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{
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return m_variables.remove(name);
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}
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bool DeclarativeEnvironmentRecord::has_super_binding() const
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{
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return m_environment_record_type == EnvironmentRecordType::Function && this_binding_status() != ThisBindingStatus::Lexical && m_home_object.is_object();
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}
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Value DeclarativeEnvironmentRecord::get_super_base()
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{
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VERIFY(has_super_binding());
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if (m_home_object.is_object())
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return m_home_object.as_object().prototype();
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return {};
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}
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bool DeclarativeEnvironmentRecord::has_this_binding() const
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{
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// More like "is_capable_of_having_a_this_binding".
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switch (m_environment_record_type) {
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case EnvironmentRecordType::Declarative:
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case EnvironmentRecordType::Object:
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return false;
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case EnvironmentRecordType::Function:
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return this_binding_status() != ThisBindingStatus::Lexical;
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case EnvironmentRecordType::Module:
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return true;
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}
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VERIFY_NOT_REACHED();
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}
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Value DeclarativeEnvironmentRecord::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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void DeclarativeEnvironmentRecord::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 (m_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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}
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}
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