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