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LibJS: Implement the GetMethod() abstract operation as a Value method

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This was a standalone function previously (get_method()), but instead of
passing a Value to it, we can just make it a method.

Also add spec step comments and fix the receiver value by using GetV().
This commit is contained in:
Linus Groh 2021-06-26 19:24:35 +01:00
parent 31f5797e89
commit 337ad6d15c
Notes: sideshowbarker 2024-07-18 11:28:24 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/337ad6d15cf
8 changed files with 48 additions and 41 deletions
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19
Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
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@ -39,25 +39,6 @@ Value require_object_coercible(GlobalObject& global_object, Value value)
return value;
}
// 7.3.10 GetMethod ( V, P ), https://tc39.es/ecma262/#sec-getmethod
Function* get_method(GlobalObject& global_object, Value value, PropertyName const& property_name)
{
auto& vm = global_object.vm();
auto* object = value.to_object(global_object);
if (vm.exception())
return nullptr;
auto property_value = object->get(property_name);
if (vm.exception())
return nullptr;
if (property_value.is_empty() || property_value.is_nullish())
return nullptr;
if (!property_value.is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAFunction, property_value.to_string_without_side_effects());
return nullptr;
}
return &property_value.as_function();
}
// 7.3.18 LengthOfArrayLike ( obj ), https://tc39.es/ecma262/#sec-lengthofarraylike
size_t length_of_array_like(GlobalObject& global_object, Object const& object)
{

1
Userland/Libraries/LibJS/Runtime/AbstractOperations.h
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@ -18,7 +18,6 @@ ObjectEnvironmentRecord* new_object_environment(Object&, bool is_with_environmen
EnvironmentRecord& get_this_environment(VM&);
Object* get_super_constructor(VM&);
Value require_object_coercible(GlobalObject&, Value);
Function* get_method(GlobalObject& global_object, Value, PropertyName const&);
size_t length_of_array_like(GlobalObject&, Object const&);
MarkedValueList create_list_from_array_like(GlobalObject&, Value, AK::Function<Result<void, ErrorType>(Value)> = {});
Function* species_constructor(GlobalObject&, Object const&, Function& default_constructor);

2
Userland/Libraries/LibJS/Runtime/IteratorOperations.cpp
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@ -101,7 +101,7 @@ void iterator_close(Object& iterator)
vm.unwind(unwind_until, unwind_until_label);
};
auto return_method = get_method(global_object, &iterator, vm.names.return_);
auto return_method = Value(&iterator).get_method(global_object, vm.names.return_);
if (!return_method)
return restore_completion(); // If return is undefined, return Completion(completion).

24
Userland/Libraries/LibJS/Runtime/ProxyObject.cpp
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@ -62,7 +62,7 @@ Object* ProxyObject::prototype()
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return nullptr;
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.getPrototypeOf);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.getPrototypeOf);
if (vm.exception())
return nullptr;
if (!trap)
@ -108,7 +108,7 @@ bool ProxyObject::set_prototype(Object* object)
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return false;
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.setPrototypeOf);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.setPrototypeOf);
if (vm.exception())
return false;
if (!trap)
@ -135,7 +135,7 @@ bool ProxyObject::is_extensible() const
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return false;
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.isExtensible);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.isExtensible);
if (vm.exception())
return false;
if (!trap)
@ -158,7 +158,7 @@ bool ProxyObject::prevent_extensions()
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return false;
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.preventExtensions);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.preventExtensions);
if (vm.exception())
return false;
if (!trap)
@ -181,7 +181,7 @@ Optional<PropertyDescriptor> ProxyObject::get_own_property_descriptor(const Prop
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return {};
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.getOwnPropertyDescriptor);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.getOwnPropertyDescriptor);
if (vm.exception())
return {};
if (!trap)
@ -232,7 +232,7 @@ bool ProxyObject::define_property(const StringOrSymbol& property_name, const Obj
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return false;
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.defineProperty);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.defineProperty);
if (vm.exception())
return false;
if (!trap)
@ -279,7 +279,7 @@ bool ProxyObject::has_property(const PropertyName& name) const
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return false;
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.has);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.has);
if (vm.exception())
return false;
if (!trap)
@ -319,7 +319,7 @@ Value ProxyObject::get(const PropertyName& name, Value receiver, AllowSideEffect
}
if (receiver.is_empty())
receiver = Value(const_cast<ProxyObject*>(this));
auto trap = get_method(global_object(), Value(&m_handler), vm.names.get);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.get);
if (vm.exception())
return {};
if (!trap)
@ -352,7 +352,7 @@ bool ProxyObject::put(const PropertyName& name, Value value, Value receiver)
}
if (receiver.is_empty())
receiver = Value(const_cast<ProxyObject*>(this));
auto trap = get_method(global_object(), Value(&m_handler), vm.names.set);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.set);
if (vm.exception())
return false;
if (!trap)
@ -382,7 +382,7 @@ bool ProxyObject::delete_property(PropertyName const& name, bool force_throw_exc
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return false;
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.deleteProperty);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.deleteProperty);
if (vm.exception())
return false;
if (!trap)
@ -422,7 +422,7 @@ Value ProxyObject::call()
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return {};
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.apply);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.apply);
if (vm.exception())
return {};
if (!trap)
@ -451,7 +451,7 @@ Value ProxyObject::construct(Function& new_target)
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return {};
}
auto trap = get_method(global_object(), Value(&m_handler), vm.names.construct);
auto trap = Value(&m_handler).get_method(global_object(), vm.names.construct);
if (vm.exception())
return {};
if (!trap)

4
Userland/Libraries/LibJS/Runtime/RegExpPrototype.cpp
View File

@ -262,7 +262,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_match)
return {};
bool global = global_value.to_boolean();
// FIXME: Implement and use RegExpExec, this does something different - https://tc39.es/ecma262/#sec-regexpexec
auto* exec = get_method(global_object, rx, vm.names.exec);
auto* exec = Value(rx).get_method(global_object, vm.names.exec);
if (!exec)
return js_undefined();
// FIXME end
@ -295,7 +295,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_replace)
rx->regex().start_offset = 0;
// FIXME: Implement and use RegExpExec - https://tc39.es/ecma262/#sec-regexpexec
auto* exec = get_method(global_object, rx, vm.names.exec);
auto* exec = Value(rx).get_method(global_object, vm.names.exec);
if (!exec)
return {};

8
Userland/Libraries/LibJS/Runtime/StringPrototype.cpp
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@ -702,7 +702,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::match)
return {};
auto regexp = vm.argument(0);
if (!regexp.is_nullish()) {
if (auto* matcher = get_method(global_object, regexp, *vm.well_known_symbol_match()))
if (auto* matcher = regexp.get_method(global_object, *vm.well_known_symbol_match()))
return vm.call(*matcher, regexp, this_object);
}
auto s = this_object.to_string(global_object);
@ -740,7 +740,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::match_all)
return {};
}
}
if (auto* matcher = get_method(global_object, regexp, *vm.well_known_symbol_match_all()))
if (auto* matcher = regexp.get_method(global_object, *vm.well_known_symbol_match_all()))
return vm.call(*matcher, regexp, this_object);
if (vm.exception())
return {};
@ -764,7 +764,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::replace)
auto replace_value = vm.argument(1);
if (!search_value.is_nullish()) {
if (auto* replacer = get_method(global_object, search_value, *vm.well_known_symbol_replace()))
if (auto* replacer = search_value.get_method(global_object, *vm.well_known_symbol_replace()))
return vm.call(*replacer, search_value, this_object, replace_value);
}
@ -812,7 +812,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::search)
return {};
auto regexp = vm.argument(0);
if (!regexp.is_nullish()) {
if (auto* searcher = get_method(global_object, regexp, *vm.well_known_symbol_search()))
if (auto* searcher = regexp.get_method(global_object, *vm.well_known_symbol_search()))
return vm.call(*searcher, regexp, this_object);
if (vm.exception())
return {};

30
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -413,7 +413,7 @@ Value Value::to_primitive(GlobalObject& global_object, PreferredType preferred_t
};
if (is_object()) {
auto& vm = global_object.vm();
auto to_primitive_method = get_method(global_object, *this, *vm.well_known_symbol_to_primitive());
auto to_primitive_method = get_method(global_object, *vm.well_known_symbol_to_primitive());
if (vm.exception())
return {};
if (to_primitive_method) {
@ -805,6 +805,32 @@ Value Value::get(GlobalObject& global_object, PropertyName const& property_name)
return object->get(property_name, *this);
}
// 7.3.10 GetMethod ( V, P ), https://tc39.es/ecma262/#sec-getmethod
Function* Value::get_method(GlobalObject& global_object, PropertyName const& property_name) const
{
auto& vm = global_object.vm();
// 1. Assert: IsPropertyKey(P) is true.
// 2. Let func be ? GetV(V, P).
auto function = get(global_object, property_name).value_or(js_undefined());
if (vm.exception())
return nullptr;
// 3. If func is either undefined or null, return undefined.
if (function.is_nullish())
return nullptr;
// 4. If IsCallable(func) is false, throw a TypeError exception.
if (!function.is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAFunction, function.to_string_without_side_effects());
return nullptr;
}
// 5. Return func.
return &function.as_function();
}
// 13.10 Relational Operators, https://tc39.es/ecma262/#sec-relational-operators
Value greater_than(GlobalObject& global_object, Value lhs, Value rhs)
{
@ -1204,7 +1230,7 @@ Value instance_of(GlobalObject& global_object, Value lhs, Value rhs)
vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObject, rhs.to_string_without_side_effects());
return {};
}
auto has_instance_method = get_method(global_object, Value(&rhs.as_object()), *vm.well_known_symbol_has_instance());
auto has_instance_method = rhs.get_method(global_object, *vm.well_known_symbol_has_instance());
if (vm.exception())
return {};
if (has_instance_method) {

1
Userland/Libraries/LibJS/Runtime/Value.h
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@ -288,6 +288,7 @@ public:
bool to_boolean() const;
Value get(GlobalObject&, PropertyName const&) const;
Function* get_method(GlobalObject&, PropertyName const&) const;
String to_string_without_side_effects() const;