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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/FunctionEnvironment.h>
#include <LibJS/Runtime/FunctionObject.h>
#include <LibJS/Runtime/GlobalObject.h>
namespace JS {
FunctionEnvironment::FunctionEnvironment(Environment* parent_scope, HashMap<FlyString, Variable> variables)
: DeclarativeEnvironment(variables, parent_scope)
{
}
FunctionEnvironment::~FunctionEnvironment()
{
}
void FunctionEnvironment::visit_edges(Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_this_value);
visitor.visit(m_new_target);
visitor.visit(m_function_object);
}
// 9.1.1.3.5 GetSuperBase ( ), https://tc39.es/ecma262/#sec-getsuperbase
Value FunctionEnvironment::get_super_base() const
{
VERIFY(m_function_object);
auto home_object = m_function_object->home_object();
if (home_object.is_undefined())
return js_undefined();
return home_object.as_object().internal_get_prototype_of();
}
// 9.1.1.3.2 HasThisBinding ( ), https://tc39.es/ecma262/#sec-function-environment-records-hasthisbinding
bool FunctionEnvironment::has_this_binding() const
{
if (this_binding_status() == ThisBindingStatus::Lexical)
return false;
return true;
}
// 9.1.1.3.3 HasSuperBinding ( ), https://tc39.es/ecma262/#sec-function-environment-records-hassuperbinding
bool FunctionEnvironment::has_super_binding() const
{
if (this_binding_status() == ThisBindingStatus::Lexical)
return false;
if (function_object().home_object().is_undefined())
return false;
return true;
}
// 9.1.1.3.4 GetThisBinding ( ), https://tc39.es/ecma262/#sec-function-environment-records-getthisbinding
Value FunctionEnvironment::get_this_binding(GlobalObject& global_object) const
{
VERIFY(has_this_binding());
if (this_binding_status() == ThisBindingStatus::Uninitialized) {
vm().throw_exception<ReferenceError>(global_object, ErrorType::ThisHasNotBeenInitialized);
return {};
}
return m_this_value;
}
// 9.1.1.3.1 BindThisValue ( V ), https://tc39.es/ecma262/#sec-bindthisvalue
Value FunctionEnvironment::bind_this_value(GlobalObject& global_object, Value this_value)
{
VERIFY(this_binding_status() != ThisBindingStatus::Lexical);
if (this_binding_status() == ThisBindingStatus::Initialized) {
vm().throw_exception<ReferenceError>(global_object, ErrorType::ThisIsAlreadyInitialized);
return {};
}
m_this_value = this_value;
m_this_binding_status = ThisBindingStatus::Initialized;
return this_value;
}
}
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