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/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/AST.h>
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/GlobalEnvironment.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/ObjectEnvironment.h>
namespace JS {
// 9.1.2.5 NewGlobalEnvironment ( G, thisValue ), https://tc39.es/ecma262/#sec-newglobalenvironment
GlobalEnvironment::GlobalEnvironment(GlobalObject& global_object, Object& this_value)
: Environment(nullptr)
, m_global_this_value(&this_value)
{
m_object_record = global_object.heap().allocate<ObjectEnvironment>(global_object, global_object, ObjectEnvironment::IsWithEnvironment::No, nullptr);
m_declarative_record = global_object.heap().allocate<DeclarativeEnvironment>(global_object);
}
void GlobalEnvironment::visit_edges(Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_object_record);
visitor.visit(m_global_this_value);
visitor.visit(m_declarative_record);
}
Value GlobalEnvironment::get_this_binding(GlobalObject&) const
{
return m_global_this_value;
}
// 9.1.1.4.1 HasBinding ( N ), https://tc39.es/ecma262/#sec-global-environment-records-hasbinding-n
bool GlobalEnvironment::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 GlobalEnvironment::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 GlobalEnvironment::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 GlobalEnvironment::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 GlobalEnvironment::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 GlobalEnvironment::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 GlobalEnvironment::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->binding_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 GlobalEnvironment::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 GlobalEnvironment::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 GlobalEnvironment::has_restricted_global_property(FlyString const& name) const
{
auto& global_object = m_object_record->binding_object();
auto existing_prop = TRY_OR_DISCARD(global_object.internal_get_own_property(name));
if (!existing_prop.has_value())
return false;
if (*existing_prop->configurable)
return false;
return true;
}
// 9.1.1.4.15 CanDeclareGlobalVar ( N ), https://tc39.es/ecma262/#sec-candeclareglobalvar
bool GlobalEnvironment::can_declare_global_var(FlyString const& name) const
{
auto& vm = this->vm();
auto& global_object = m_object_record->binding_object();
bool has_property = global_object.has_own_property(name);
if (vm.exception())
return {};
if (has_property)
return true;
return TRY_OR_DISCARD(global_object.is_extensible());
}
// 9.1.1.4.16 CanDeclareGlobalFunction ( N ), https://tc39.es/ecma262/#sec-candeclareglobalfunction
bool GlobalEnvironment::can_declare_global_function(FlyString const& name) const
{
auto& global_object = m_object_record->binding_object();
auto existing_prop = TRY_OR_DISCARD(global_object.internal_get_own_property(name));
if (!existing_prop.has_value())
return TRY_OR_DISCARD(global_object.is_extensible());
if (*existing_prop->configurable)
return true;
if (existing_prop->is_data_descriptor() && *existing_prop->writable && *existing_prop->enumerable)
return true;
return false;
}
// 9.1.1.4.17 CreateGlobalVarBinding ( N, D ), https://tc39.es/ecma262/#sec-createglobalvarbinding
void GlobalEnvironment::create_global_var_binding(FlyString const& name, bool can_be_deleted)
{
auto& vm = this->vm();
auto& global_object = m_object_record->binding_object();
bool has_property = global_object.has_own_property(name);
if (vm.exception())
return;
auto extensible_or_error = global_object.is_extensible();
if (extensible_or_error.is_error())
return;
auto extensible = extensible_or_error.release_value();
if (!has_property && extensible) {
m_object_record->create_mutable_binding(m_object_record->global_object(), name, can_be_deleted);
if (vm.exception())
return;
m_object_record->initialize_binding(m_object_record->global_object(), name, js_undefined());
if (vm.exception())
return;
}
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 GlobalEnvironment::create_global_function_binding(FlyString const& name, Value value, bool can_be_deleted)
{
auto& global_object = m_object_record->binding_object();
auto existing_prop_or_error = global_object.internal_get_own_property(name);
if (existing_prop_or_error.is_error())
return;
auto existing_prop = existing_prop_or_error.release_value();
PropertyDescriptor desc;
if (!existing_prop.has_value() || *existing_prop->configurable)
desc = { .value = value, .writable = true, .enumerable = true, .configurable = can_be_deleted };
else
desc = { .value = value };
auto result_or_error = global_object.define_property_or_throw(name, desc);
if (result_or_error.is_error())
return;
result_or_error = global_object.set(name, value, Object::ShouldThrowExceptions::Yes);
if (result_or_error.is_error())
return;
if (!m_var_names.contains_slow(name))
m_var_names.append(name);
}
}
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