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/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/AST.h>
#include <LibJS/Runtime/DeclarativeEnvironmentRecord.h>
#include <LibJS/Runtime/GlobalEnvironmentRecord.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/ObjectEnvironmentRecord.h>
namespace JS {
GlobalEnvironmentRecord::GlobalEnvironmentRecord(GlobalObject& global_object)
: EnvironmentRecord(nullptr)
, m_global_object(global_object)
{
m_object_record = global_object.heap().allocate<ObjectEnvironmentRecord>(global_object, global_object, nullptr);
m_declarative_record = global_object.heap().allocate<DeclarativeEnvironmentRecord>(global_object);
}
void GlobalEnvironmentRecord::visit_edges(Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_object_record);
visitor.visit(m_declarative_record);
}
Optional<Variable> GlobalEnvironmentRecord::get_from_environment_record(FlyString const& name) const
{
// FIXME: This should be a "composite" of the object record and the declarative record.
return m_object_record->get_from_environment_record(name);
}
void GlobalEnvironmentRecord::put_into_environment_record(FlyString const& name, Variable variable)
{
// FIXME: This should be a "composite" of the object record and the declarative record.
m_object_record->put_into_environment_record(name, variable);
}
bool GlobalEnvironmentRecord::delete_from_environment_record(FlyString const& name)
{
// FIXME: This should be a "composite" of the object record and the declarative record.
return object_record().delete_from_environment_record(name);
}
Value GlobalEnvironmentRecord::get_this_binding(GlobalObject&) const
{
return &m_global_object;
}
Value GlobalEnvironmentRecord::global_this_value() const
{
return &m_global_object;
}
// 9.1.1.4.1 HasBinding ( N ), https://tc39.es/ecma262/#sec-global-environment-records-hasbinding-n
bool GlobalEnvironmentRecord::has_binding(FlyString const& name) const
{
if (m_declarative_record->has_binding(name))
return true;
return m_object_record->has_binding(name);
}
// 9.1.1.4.2 CreateMutableBinding ( N, D ), https://tc39.es/ecma262/#sec-global-environment-records-createmutablebinding-n-d
void GlobalEnvironmentRecord::create_mutable_binding(GlobalObject& global_object, FlyString const& name, bool can_be_deleted)
{
if (m_declarative_record->has_binding(name)) {
global_object.vm().throw_exception<TypeError>(global_object, ErrorType::FixmeAddAnErrorString);
return;
}
m_declarative_record->create_mutable_binding(global_object, name, can_be_deleted);
}
// 9.1.1.4.3 CreateImmutableBinding ( N, S ), https://tc39.es/ecma262/#sec-global-environment-records-createimmutablebinding-n-s
void GlobalEnvironmentRecord::create_immutable_binding(GlobalObject& global_object, FlyString const& name, bool strict)
{
if (m_declarative_record->has_binding(name)) {
global_object.vm().throw_exception<TypeError>(global_object, ErrorType::FixmeAddAnErrorString);
return;
}
m_declarative_record->create_immutable_binding(global_object, name, strict);
}
// 9.1.1.4.4 InitializeBinding ( N, V ), https://tc39.es/ecma262/#sec-global-environment-records-initializebinding-n-v
void GlobalEnvironmentRecord::initialize_binding(GlobalObject& global_object, FlyString const& name, Value value)
{
if (m_declarative_record->has_binding(name)) {
m_declarative_record->initialize_binding(global_object, name, value);
return;
}
m_object_record->initialize_binding(global_object, name, value);
}
// 9.1.1.4.5 SetMutableBinding ( N, V, S ), https://tc39.es/ecma262/#sec-global-environment-records-setmutablebinding-n-v-s
void GlobalEnvironmentRecord::set_mutable_binding(GlobalObject& global_object, FlyString const& name, Value value, bool strict)
{
if (m_declarative_record->has_binding(name)) {
m_declarative_record->set_mutable_binding(global_object, name, value, strict);
return;
}
m_object_record->set_mutable_binding(global_object, name, value, strict);
}
// 9.1.1.4.6 GetBindingValue ( N, S ), https://tc39.es/ecma262/#sec-global-environment-records-getbindingvalue-n-s
Value GlobalEnvironmentRecord::get_binding_value(GlobalObject& global_object, FlyString const& name, bool strict)
{
if (m_declarative_record->has_binding(name))
return m_declarative_record->get_binding_value(global_object, name, strict);
return m_object_record->get_binding_value(global_object, name, strict);
}
// 9.1.1.4.7 DeleteBinding ( N ), https://tc39.es/ecma262/#sec-global-environment-records-deletebinding-n
bool GlobalEnvironmentRecord::delete_binding(GlobalObject& global_object, FlyString const& name)
{
if (m_declarative_record->has_binding(name))
return m_declarative_record->delete_binding(global_object, name);
bool existing_prop = m_object_record->object().has_own_property(name);
if (existing_prop) {
bool status = m_object_record->delete_binding(global_object, name);
if (status) {
m_var_names.remove_all_matching([&](auto& entry) { return entry == name; });
}
return status;
}
return true;
}
// 9.1.1.4.12 HasVarDeclaration ( N ), https://tc39.es/ecma262/#sec-hasvardeclaration
bool GlobalEnvironmentRecord::has_var_declaration(FlyString const& name) const
{
return m_var_names.contains_slow(name);
}
// 9.1.1.4.13 HasLexicalDeclaration ( N ), https://tc39.es/ecma262/#sec-haslexicaldeclaration
bool GlobalEnvironmentRecord::has_lexical_declaration(FlyString const& name) const
{
return m_declarative_record->has_binding(name);
}
// 9.1.1.4.14 HasRestrictedGlobalProperty ( N ), https://tc39.es/ecma262/#sec-hasrestrictedglobalproperty
bool GlobalEnvironmentRecord::has_restricted_global_property(FlyString const& name) const
{
auto existing_prop = m_global_object.get_own_property_descriptor(name);
if (!existing_prop.has_value() || existing_prop.value().value.is_undefined())
return false;
if (existing_prop.value().attributes.is_configurable())
return false;
return true;
}
// 9.1.1.4.15 CanDeclareGlobalVar ( N ), https://tc39.es/ecma262/#sec-candeclareglobalvar
bool GlobalEnvironmentRecord::can_declare_global_var(FlyString const& name) const
{
bool has_property = m_object_record->object().has_own_property(name);
if (has_property)
return true;
return m_object_record->object().is_extensible();
}
// 9.1.1.4.16 CanDeclareGlobalFunction ( N ), https://tc39.es/ecma262/#sec-candeclareglobalfunction
bool GlobalEnvironmentRecord::can_declare_global_function(FlyString const& name) const
{
auto existing_prop = m_object_record->object().get_own_property_descriptor(name);
if (!existing_prop.has_value() || existing_prop.value().value.is_undefined())
return m_object_record->object().is_extensible();
if (existing_prop.value().attributes.is_configurable())
return true;
if (existing_prop.value().is_data_descriptor() && existing_prop.value().attributes.is_writable() && existing_prop.value().attributes.is_enumerable())
return true;
return false;
}
// 9.1.1.4.17 CreateGlobalVarBinding ( N, D ), https://tc39.es/ecma262/#sec-createglobalvarbinding
void GlobalEnvironmentRecord::create_global_var_binding(FlyString const& name, bool can_be_deleted)
{
bool has_property = m_object_record->object().has_own_property(name);
bool extensible = m_object_record->object().is_extensible();
if (!has_property && extensible) {
m_object_record->create_mutable_binding(static_cast<GlobalObject&>(m_object_record->object()), name, can_be_deleted);
m_object_record->initialize_binding(m_object_record->global_object(), name, js_undefined());
}
if (!m_var_names.contains_slow(name))
m_var_names.append(name);
}
// 9.1.1.4.18 CreateGlobalFunctionBinding ( N, V, D ), https://tc39.es/ecma262/#sec-createglobalfunctionbinding
void GlobalEnvironmentRecord::create_global_function_binding(FlyString const& name, Value value, bool can_be_deleted)
{
auto existing_prop = m_object_record->object().get_own_property_descriptor(name);
PropertyDescriptor desc;
if (!existing_prop.has_value() || existing_prop.value().value.is_undefined() || existing_prop.value().attributes.is_configurable()) {
desc.value = value;
desc.attributes.set_has_writable();
desc.attributes.set_writable();
desc.attributes.set_has_enumerable();
desc.attributes.set_enumerable();
desc.attributes.set_has_configurable();
if (can_be_deleted)
desc.attributes.set_configurable();
} else {
desc.value = value;
}
// FIXME: This should be DefinePropertyOrThrow, followed by Set
m_object_record->object().define_property(name, value, desc.attributes);
if (vm().exception())
return;
if (!m_var_names.contains_slow(name))
m_var_names.append(name);
}
}
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