mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-20 09:49:15 +03:00
0881f8160f
Luckily this is not very widespread yet as most of it would happen in the various JS functions instead of AOs.
102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
/*
|
|
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <LibJS/Interpreter.h>
|
|
#include <LibJS/Runtime/Completion.h>
|
|
#include <LibJS/Runtime/FunctionEnvironment.h>
|
|
#include <LibJS/Runtime/GlobalObject.h>
|
|
|
|
namespace JS {
|
|
|
|
FunctionEnvironment::FunctionEnvironment(Environment* parent_scope)
|
|
: DeclarativeEnvironment(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
|
|
ThrowCompletionOr<Value> FunctionEnvironment::get_super_base() const
|
|
{
|
|
VERIFY(m_function_object);
|
|
|
|
// 1. Let home be envRec.[[FunctionObject]].[[HomeObject]].
|
|
auto home_object = m_function_object->home_object();
|
|
|
|
// 2. If home has the value undefined, return undefined.
|
|
if (!home_object)
|
|
return js_undefined();
|
|
|
|
// 3. Assert: Type(home) is Object.
|
|
|
|
// 4. Return ? home.[[GetPrototypeOf]]().
|
|
return TRY(home_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())
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
// 9.1.1.3.4 GetThisBinding ( ), https://tc39.es/ecma262/#sec-function-environment-records-getthisbinding
|
|
ThrowCompletionOr<Value> FunctionEnvironment::get_this_binding(GlobalObject& global_object) const
|
|
{
|
|
// 1. Assert: envRec.[[ThisBindingStatus]] is not lexical.
|
|
VERIFY(m_this_binding_status != ThisBindingStatus::Lexical);
|
|
|
|
// 2. If envRec.[[ThisBindingStatus]] is uninitialized, throw a ReferenceError exception.
|
|
if (m_this_binding_status == ThisBindingStatus::Uninitialized)
|
|
return vm().throw_completion<ReferenceError>(global_object, ErrorType::ThisHasNotBeenInitialized);
|
|
|
|
// 3. Return envRec.[[ThisValue]].
|
|
return m_this_value;
|
|
}
|
|
|
|
// 9.1.1.3.1 BindThisValue ( V ), https://tc39.es/ecma262/#sec-bindthisvalue
|
|
ThrowCompletionOr<Value> FunctionEnvironment::bind_this_value(GlobalObject& global_object, Value this_value)
|
|
{
|
|
// 1. Assert: envRec.[[ThisBindingStatus]] is not lexical.
|
|
VERIFY(m_this_binding_status != ThisBindingStatus::Lexical);
|
|
|
|
// 2. If envRec.[[ThisBindingStatus]] is initialized, throw a ReferenceError exception.
|
|
if (m_this_binding_status == ThisBindingStatus::Initialized)
|
|
return vm().throw_completion<ReferenceError>(global_object, ErrorType::ThisIsAlreadyInitialized);
|
|
|
|
// 3. Set envRec.[[ThisValue]] to V.
|
|
m_this_value = this_value;
|
|
|
|
// 4. Set envRec.[[ThisBindingStatus]] to initialized.
|
|
m_this_binding_status = ThisBindingStatus::Initialized;
|
|
|
|
// 5. Return V.
|
|
return this_value;
|
|
}
|
|
|
|
}
|