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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/BoundFunction.h>
#include <LibJS/Runtime/FunctionObject.h>
#include <LibJS/Runtime/GlobalObject.h>
namespace JS {
FunctionObject::FunctionObject(Object& prototype)
: FunctionObject({}, {}, prototype)
{
}
FunctionObject::FunctionObject(Value bound_this, Vector<Value> bound_arguments, Object& prototype)
: Object(prototype)
, m_bound_this(bound_this)
, m_bound_arguments(move(bound_arguments))
{
}
FunctionObject::~FunctionObject()
{
}
BoundFunction* FunctionObject::bind(Value bound_this_value, Vector<Value> arguments)
{
auto& vm = this->vm();
FunctionObject& target_function = is<BoundFunction>(*this) ? static_cast<BoundFunction&>(*this).target_function() : *this;
auto bound_this_object = [&vm, bound_this_value, this]() -> Value {
if (!m_bound_this.is_empty())
return m_bound_this;
switch (bound_this_value.type()) {
case Value::Type::Undefined:
case Value::Type::Null:
if (vm.in_strict_mode())
return bound_this_value;
return &global_object();
default:
return bound_this_value.to_object(global_object());
}
}();
i32 computed_length = 0;
auto length_property = get(vm.names.length);
if (vm.exception())
return nullptr;
if (length_property.is_number())
computed_length = max(0, length_property.as_i32() - static_cast<i32>(arguments.size()));
Object* constructor_prototype = nullptr;
auto prototype_property = target_function.get(vm.names.prototype);
if (vm.exception())
return nullptr;
if (prototype_property.is_object())
constructor_prototype = &prototype_property.as_object();
auto all_bound_arguments = bound_arguments();
all_bound_arguments.extend(move(arguments));
return heap().allocate<BoundFunction>(global_object(), global_object(), target_function, bound_this_object, move(all_bound_arguments), computed_length, constructor_prototype);
}
void FunctionObject::visit_edges(Visitor& visitor)
{
Object::visit_edges(visitor);
visitor.visit(m_home_object);
visitor.visit(m_bound_this);
for (auto argument : m_bound_arguments)
visitor.visit(argument);
}
}
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