133 lines
5.3 KiB
C++
133 lines
5.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021-2022, Linus Groh <linusg@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/Completion.h>
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#include <LibJS/Runtime/FunctionObject.h>
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namespace JS {
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FunctionObject::FunctionObject(Object& prototype)
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: Object(prototype)
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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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// 10.2.9 SetFunctionName ( F, name [ , prefix ] ), https://tc39.es/ecma262/#sec-setfunctionname
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void FunctionObject::set_function_name(Variant<PropertyKey, PrivateName> const& name_arg, Optional<StringView> const& prefix)
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{
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auto& vm = this->vm();
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// 1. Assert: F is an extensible object that does not have a "name" own property.
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VERIFY(m_is_extensible);
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VERIFY(!storage_has(vm.names.name));
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String name;
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// 2. If Type(name) is Symbol, then
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if (auto const* property_key = name_arg.get_pointer<PropertyKey>(); property_key && property_key->is_symbol()) {
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// a. Let description be name's [[Description]] value.
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auto const& description = property_key->as_symbol()->raw_description();
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// b. If description is undefined, set name to the empty String.
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if (!description.has_value())
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name = String::empty();
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// c. Else, set name to the string-concatenation of "[", description, and "]".
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else
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name = String::formatted("[{}]", *description);
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}
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// 3. Else if name is a Private Name, then
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else if (auto const* private_name = name_arg.get_pointer<PrivateName>()) {
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// a. Set name to name.[[Description]].
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name = private_name->description;
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}
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// NOTE: This is necessary as we use a different parameter name.
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else {
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name = name_arg.get<PropertyKey>().to_string();
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}
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// 4. If F has an [[InitialName]] internal slot, then
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if (is<NativeFunction>(this)) {
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// a. Set F.[[InitialName]] to name.
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// TODO: Remove FunctionObject::name(), implement NativeFunction::initial_name(), and then do this.
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}
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// 5. If prefix is present, then
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if (prefix.has_value()) {
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// a. Set name to the string-concatenation of prefix, the code unit 0x0020 (SPACE), and name.
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name = String::formatted("{} {}", *prefix, name);
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// b. If F has an [[InitialName]] internal slot, then
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if (is<NativeFunction>(this)) {
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// i. Optionally, set F.[[InitialName]] to name.
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// TODO: See above.
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}
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}
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// 6. Return ! DefinePropertyOrThrow(F, "name", PropertyDescriptor { [[Value]]: name, [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
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MUST(define_property_or_throw(vm.names.name, PropertyDescriptor { .value = js_string(vm, move(name)), .writable = false, .enumerable = false, .configurable = true }));
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}
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// 10.2.10 SetFunctionLength ( F, length ), https://tc39.es/ecma262/#sec-setfunctionlength
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void FunctionObject::set_function_length(double length)
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{
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auto& vm = this->vm();
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// "length (a non-negative integer or +∞)"
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VERIFY(trunc(length) == length || __builtin_isinf_sign(length) == 1);
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// 1. Assert: F is an extensible object that does not have a "length" own property.
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VERIFY(m_is_extensible);
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VERIFY(!storage_has(vm.names.length));
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// 2. Return ! DefinePropertyOrThrow(F, "length", PropertyDescriptor { [[Value]]: 𝔽(length), [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
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MUST(define_property_or_throw(vm.names.length, PropertyDescriptor { .value = Value { length }, .writable = false, .enumerable = false, .configurable = true }));
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}
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ThrowCompletionOr<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).bound_target_function() : *this;
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auto get_bound_this_object = [&vm, bound_this_value, this]() -> ThrowCompletionOr<Value> {
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if (is<BoundFunction>(*this) && !static_cast<BoundFunction&>(*this).bound_this().is_empty())
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return static_cast<BoundFunction&>(*this).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 TRY(bound_this_value.to_object(global_object()));
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}
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};
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auto bound_this_object = TRY(get_bound_this_object());
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i32 computed_length = 0;
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auto length_property = TRY(get(vm.names.length));
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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 = TRY(target_function.get(vm.names.prototype));
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if (prototype_property.is_object())
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constructor_prototype = &prototype_property.as_object();
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Vector<Value> all_bound_arguments;
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if (is<BoundFunction>(*this))
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all_bound_arguments.extend(static_cast<BoundFunction&>(*this).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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}
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