978 lines
44 KiB
C++
978 lines
44 KiB
C++
/*
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* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2021, 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 <AK/CharacterTypes.h>
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#include <AK/Function.h>
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#include <AK/Optional.h>
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#include <AK/TemporaryChange.h>
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#include <AK/Utf16View.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Parser.h>
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/Accessor.h>
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#include <LibJS/Runtime/ArgumentsObject.h>
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#include <LibJS/Runtime/Array.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/DeclarativeEnvironment.h>
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#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
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#include <LibJS/Runtime/ErrorTypes.h>
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#include <LibJS/Runtime/FunctionEnvironment.h>
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#include <LibJS/Runtime/FunctionObject.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Object.h>
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#include <LibJS/Runtime/ObjectEnvironment.h>
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#include <LibJS/Runtime/PropertyDescriptor.h>
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#include <LibJS/Runtime/PropertyKey.h>
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#include <LibJS/Runtime/ProxyObject.h>
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#include <LibJS/Runtime/Reference.h>
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namespace JS {
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// 7.2.1 RequireObjectCoercible ( argument ), https://tc39.es/ecma262/#sec-requireobjectcoercible
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ThrowCompletionOr<Value> require_object_coercible(GlobalObject& global_object, Value value)
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{
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auto& vm = global_object.vm();
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if (value.is_nullish())
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return vm.throw_completion<TypeError>(global_object, ErrorType::NotObjectCoercible, value.to_string_without_side_effects());
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return value;
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}
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// 7.3.13 Call ( F, V [ , argumentsList ] ), https://tc39.es/ecma262/#sec-call
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ThrowCompletionOr<Value> call_impl(GlobalObject& global_object, Value function, Value this_value, Optional<MarkedValueList> arguments_list)
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{
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auto& vm = global_object.vm();
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// 1. If argumentsList is not present, set argumentsList to a new empty List.
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if (!arguments_list.has_value())
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arguments_list = MarkedValueList { global_object.heap() };
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// 2. If IsCallable(F) is false, throw a TypeError exception.
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if (!function.is_function())
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return vm.throw_completion<TypeError>(global_object, ErrorType::NotAFunction, function.to_string_without_side_effects());
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// 3. Return ? F.[[Call]](V, argumentsList).
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return function.as_function().internal_call(this_value, move(*arguments_list));
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}
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// 7.3.14 Construct ( F [ , argumentsList [ , newTarget ] ] ), https://tc39.es/ecma262/#sec-construct
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ThrowCompletionOr<Object*> construct(GlobalObject& global_object, FunctionObject& function, Optional<MarkedValueList> arguments_list, FunctionObject* new_target)
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{
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// 1. If newTarget is not present, set newTarget to F.
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if (!new_target)
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new_target = &function;
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// 2. If argumentsList is not present, set argumentsList to a new empty List.
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if (!arguments_list.has_value())
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arguments_list = MarkedValueList { global_object.heap() };
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// 3. Return ? F.[[Construct]](argumentsList, newTarget).
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return function.internal_construct(move(*arguments_list), *new_target);
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}
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// 7.3.18 LengthOfArrayLike ( obj ), https://tc39.es/ecma262/#sec-lengthofarraylike
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ThrowCompletionOr<size_t> length_of_array_like(GlobalObject& global_object, Object const& object)
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{
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auto& vm = global_object.vm();
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auto result = TRY(object.get(vm.names.length));
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return result.to_length(global_object);
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}
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// 7.3.19 CreateListFromArrayLike ( obj [ , elementTypes ] ), https://tc39.es/ecma262/#sec-createlistfromarraylike
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ThrowCompletionOr<MarkedValueList> create_list_from_array_like(GlobalObject& global_object, Value value, Function<ThrowCompletionOr<void>(Value)> check_value)
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{
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auto& vm = global_object.vm();
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auto& heap = global_object.heap();
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// 1. If elementTypes is not present, set elementTypes to « Undefined, Null, Boolean, String, Symbol, Number, BigInt, Object ».
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// 2. If Type(obj) is not Object, throw a TypeError exception.
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if (!value.is_object())
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return vm.throw_completion<TypeError>(global_object, ErrorType::NotAnObject, value.to_string_without_side_effects());
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auto& array_like = value.as_object();
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// 3. Let len be ? LengthOfArrayLike(obj).
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auto length = TRY(length_of_array_like(global_object, array_like));
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// 4. Let list be a new empty List.
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auto list = MarkedValueList { heap };
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// 5. Let index be 0.
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// 6. Repeat, while index < len,
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for (size_t i = 0; i < length; ++i) {
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// a. Let indexName be ! ToString(𝔽(index)).
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auto index_name = PropertyKey { i };
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// b. Let next be ? Get(obj, indexName).
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auto next = TRY(array_like.get(index_name));
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// c. If Type(next) is not an element of elementTypes, throw a TypeError exception.
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if (check_value)
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TRY(check_value(next));
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// d. Append next as the last element of list.
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list.append(next);
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}
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// 7. Return list.
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return ThrowCompletionOr(move(list));
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}
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// 7.3.22 SpeciesConstructor ( O, defaultConstructor ), https://tc39.es/ecma262/#sec-speciesconstructor
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ThrowCompletionOr<FunctionObject*> species_constructor(GlobalObject& global_object, Object const& object, FunctionObject& default_constructor)
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{
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auto& vm = global_object.vm();
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// 1. Let C be ? Get(O, "constructor").
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auto constructor = TRY(object.get(vm.names.constructor));
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// 2. If C is undefined, return defaultConstructor.
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if (constructor.is_undefined())
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return &default_constructor;
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// 3. If Type(C) is not Object, throw a TypeError exception.
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if (!constructor.is_object())
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return vm.throw_completion<TypeError>(global_object, ErrorType::NotAConstructor, constructor.to_string_without_side_effects());
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// 4. Let S be ? Get(C, @@species).
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auto species = TRY(constructor.as_object().get(*vm.well_known_symbol_species()));
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// 5. If S is either undefined or null, return defaultConstructor.
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if (species.is_nullish())
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return &default_constructor;
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// 6. If IsConstructor(S) is true, return S.
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if (species.is_constructor())
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return &species.as_function();
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// 7. Throw a TypeError exception.
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return vm.throw_completion<TypeError>(global_object, ErrorType::NotAConstructor, species.to_string_without_side_effects());
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}
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// 7.3.24 GetFunctionRealm ( obj ), https://tc39.es/ecma262/#sec-getfunctionrealm
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ThrowCompletionOr<Realm*> get_function_realm(GlobalObject& global_object, FunctionObject const& function)
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{
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auto& vm = global_object.vm();
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// 1. Assert: ! IsCallable(obj) is true.
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// 2. If obj has a [[Realm]] internal slot, then
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if (function.realm()) {
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// a. Return obj.[[Realm]].
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return function.realm();
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}
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// 3. If obj is a bound function exotic object, then
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if (is<BoundFunction>(function)) {
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auto& bound_function = static_cast<BoundFunction const&>(function);
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// a. Let target be obj.[[BoundTargetFunction]].
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auto& target = bound_function.bound_target_function();
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// b. Return ? GetFunctionRealm(target).
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return get_function_realm(global_object, target);
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}
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// 4. If obj is a Proxy exotic object, then
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if (is<ProxyObject>(function)) {
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auto& proxy = static_cast<ProxyObject const&>(function);
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// a. If obj.[[ProxyHandler]] is null, throw a TypeError exception.
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if (proxy.is_revoked())
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return vm.throw_completion<TypeError>(global_object, ErrorType::ProxyRevoked);
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// b. Let proxyTarget be obj.[[ProxyTarget]].
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auto& proxy_target = proxy.target();
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// c. Return ? GetFunctionRealm(proxyTarget).
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VERIFY(proxy_target.is_function());
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return get_function_realm(global_object, static_cast<FunctionObject const&>(proxy_target));
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}
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// 5. Return the current Realm Record.
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return vm.current_realm();
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}
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// 10.1.6.2 IsCompatiblePropertyDescriptor ( Extensible, Desc, Current ), https://tc39.es/ecma262/#sec-iscompatiblepropertydescriptor
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bool is_compatible_property_descriptor(bool extensible, PropertyDescriptor const& descriptor, Optional<PropertyDescriptor> const& current)
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{
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// 1. Return ValidateAndApplyPropertyDescriptor(undefined, undefined, Extensible, Desc, Current).
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return validate_and_apply_property_descriptor(nullptr, {}, extensible, descriptor, current);
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}
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// 10.1.6.3 ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current ), https://tc39.es/ecma262/#sec-validateandapplypropertydescriptor
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bool validate_and_apply_property_descriptor(Object* object, PropertyKey const& property_name, bool extensible, PropertyDescriptor const& descriptor, Optional<PropertyDescriptor> const& current)
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{
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// 1. Assert: If O is not undefined, then IsPropertyKey(P) is true.
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if (object)
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VERIFY(property_name.is_valid());
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// 2. If current is undefined, then
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if (!current.has_value()) {
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// a. If extensible is false, return false.
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if (!extensible)
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return false;
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// b. Assert: extensible is true.
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// c. If IsGenericDescriptor(Desc) is true or IsDataDescriptor(Desc) is true, then
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if (descriptor.is_generic_descriptor() || descriptor.is_data_descriptor()) {
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// i. If O is not undefined, create an own data property named P of object O whose [[Value]], [[Writable]],
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// [[Enumerable]], and [[Configurable]] attribute values are described by Desc.
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// If the value of an attribute field of Desc is absent, the attribute of the newly created property is set
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// to its default value.
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if (object) {
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auto value = descriptor.value.value_or(js_undefined());
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object->storage_set(property_name, { value, descriptor.attributes() });
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}
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}
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// d. Else,
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else {
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// i. Assert: ! IsAccessorDescriptor(Desc) is true.
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VERIFY(descriptor.is_accessor_descriptor());
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// ii. If O is not undefined, create an own accessor property named P of object O whose [[Get]], [[Set]],
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// [[Enumerable]], and [[Configurable]] attribute values are described by Desc.
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// If the value of an attribute field of Desc is absent, the attribute of the newly created property is set
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// to its default value.
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if (object) {
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auto accessor = Accessor::create(object->vm(), descriptor.get.value_or(nullptr), descriptor.set.value_or(nullptr));
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object->storage_set(property_name, { accessor, descriptor.attributes() });
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}
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}
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// e. Return true.
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return true;
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}
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// 3. If every field in Desc is absent, return true.
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if (descriptor.is_empty())
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return true;
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// 4. If current.[[Configurable]] is false, then
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if (!*current->configurable) {
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// a. If Desc.[[Configurable]] is present and its value is true, return false.
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if (descriptor.configurable.has_value() && *descriptor.configurable)
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return false;
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// b. If Desc.[[Enumerable]] is present and ! SameValue(Desc.[[Enumerable]], current.[[Enumerable]]) is false, return false.
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if (descriptor.enumerable.has_value() && *descriptor.enumerable != *current->enumerable)
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return false;
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}
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// 5. If ! IsGenericDescriptor(Desc) is true, then
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if (descriptor.is_generic_descriptor()) {
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// a. NOTE: No further validation is required.
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}
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// 6. Else if ! SameValue(! IsDataDescriptor(current), ! IsDataDescriptor(Desc)) is false, then
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else if (current->is_data_descriptor() != descriptor.is_data_descriptor()) {
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// a. If current.[[Configurable]] is false, return false.
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if (!*current->configurable)
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return false;
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// b. If IsDataDescriptor(current) is true, then
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if (current->is_data_descriptor()) {
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// If O is not undefined, convert the property named P of object O from a data property to an accessor property.
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// Preserve the existing values of the converted property's [[Configurable]] and [[Enumerable]] attributes and
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// set the rest of the property's attributes to their default values.
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if (object) {
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auto accessor = Accessor::create(object->vm(), nullptr, nullptr);
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object->storage_set(property_name, { accessor, current->attributes() });
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}
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}
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// c. Else,
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else {
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// If O is not undefined, convert the property named P of object O from an accessor property to a data property.
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// Preserve the existing values of the converted property's [[Configurable]] and [[Enumerable]] attributes and
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// set the rest of the property's attributes to their default values.
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if (object) {
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auto value = js_undefined();
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object->storage_set(property_name, { value, current->attributes() });
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}
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}
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}
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// 7. Else if IsDataDescriptor(current) and IsDataDescriptor(Desc) are both true, then
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else if (current->is_data_descriptor() && descriptor.is_data_descriptor()) {
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// a. If current.[[Configurable]] is false and current.[[Writable]] is false, then
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if (!*current->configurable && !*current->writable) {
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// i. If Desc.[[Writable]] is present and Desc.[[Writable]] is true, return false.
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if (descriptor.writable.has_value() && *descriptor.writable)
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return false;
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// ii. If Desc.[[Value]] is present and SameValue(Desc.[[Value]], current.[[Value]]) is false, return false.
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if (descriptor.value.has_value() && !same_value(*descriptor.value, *current->value))
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return false;
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// iii. Return true.
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return true;
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}
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}
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// 8. Else,
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else {
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// a. Assert: ! IsAccessorDescriptor(current) and ! IsAccessorDescriptor(Desc) are both true.
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VERIFY(current->is_accessor_descriptor());
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VERIFY(descriptor.is_accessor_descriptor());
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// b. If current.[[Configurable]] is false, then
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if (!*current->configurable) {
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// i. If Desc.[[Set]] is present and SameValue(Desc.[[Set]], current.[[Set]]) is false, return false.
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if (descriptor.set.has_value() && *descriptor.set != *current->set)
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return false;
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// ii. If Desc.[[Get]] is present and SameValue(Desc.[[Get]], current.[[Get]]) is false, return false.
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if (descriptor.get.has_value() && *descriptor.get != *current->get)
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return false;
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// iii. Return true.
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return true;
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}
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}
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// 9. If O is not undefined, then
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if (object) {
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// a. For each field of Desc that is present, set the corresponding attribute of the property named P of object O to the value of the field.
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Value value;
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if (descriptor.is_accessor_descriptor() || (current->is_accessor_descriptor() && !descriptor.is_data_descriptor())) {
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auto* getter = descriptor.get.value_or(current->get.value_or(nullptr));
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auto* setter = descriptor.set.value_or(current->set.value_or(nullptr));
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value = Accessor::create(object->vm(), getter, setter);
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} else {
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value = descriptor.value.value_or(current->value.value_or({}));
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}
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PropertyAttributes attributes;
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attributes.set_writable(descriptor.writable.value_or(current->writable.value_or(false)));
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attributes.set_enumerable(descriptor.enumerable.value_or(current->enumerable.value_or(false)));
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attributes.set_configurable(descriptor.configurable.value_or(current->configurable.value_or(false)));
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object->storage_set(property_name, { value, attributes });
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}
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// 10. Return true.
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return true;
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}
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// 10.1.14 GetPrototypeFromConstructor ( constructor, intrinsicDefaultProto ), https://tc39.es/ecma262/#sec-getprototypefromconstructor
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ThrowCompletionOr<Object*> get_prototype_from_constructor(GlobalObject& global_object, FunctionObject const& constructor, Object* (GlobalObject::*intrinsic_default_prototype)())
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{
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auto& vm = global_object.vm();
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// 1. Assert: intrinsicDefaultProto is this specification's name of an intrinsic object. The corresponding object must be an intrinsic that is intended to be used as the [[Prototype]] value of an object.
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// 2. Let proto be ? Get(constructor, "prototype").
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auto prototype = TRY(constructor.get(vm.names.prototype));
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// 3. If Type(proto) is not Object, then
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if (!prototype.is_object()) {
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// a. Let realm be ? GetFunctionRealm(constructor).
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auto* realm = TRY(get_function_realm(global_object, constructor));
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// b. Set proto to realm's intrinsic object named intrinsicDefaultProto.
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prototype = (realm->global_object().*intrinsic_default_prototype)();
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}
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// 4. Return proto.
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return &prototype.as_object();
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}
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// 9.1.2.2 NewDeclarativeEnvironment ( E ), https://tc39.es/ecma262/#sec-newdeclarativeenvironment
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DeclarativeEnvironment* new_declarative_environment(Environment& environment)
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{
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auto& global_object = environment.global_object();
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return global_object.heap().allocate<DeclarativeEnvironment>(global_object, &environment);
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}
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// 9.1.2.3 NewObjectEnvironment ( O, W, E ), https://tc39.es/ecma262/#sec-newobjectenvironment
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ObjectEnvironment* new_object_environment(Object& object, bool is_with_environment, Environment* environment)
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{
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auto& global_object = object.global_object();
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return global_object.heap().allocate<ObjectEnvironment>(global_object, object, is_with_environment ? ObjectEnvironment::IsWithEnvironment::Yes : ObjectEnvironment::IsWithEnvironment::No, environment);
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}
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// 9.1.2.4 NewFunctionEnvironment ( F, newTarget ), https://tc39.es/ecma262/#sec-newfunctionenvironment
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FunctionEnvironment* new_function_environment(ECMAScriptFunctionObject& function, Object* new_target)
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{
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auto& global_object = function.global_object();
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// 1. Let env be a new function Environment Record containing no bindings.
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auto* env = global_object.heap().allocate<FunctionEnvironment>(global_object, function.environment());
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// 2. Set env.[[FunctionObject]] to F.
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env->set_function_object(function);
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// 3. If F.[[ThisMode]] is lexical, set env.[[ThisBindingStatus]] to lexical.
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if (function.this_mode() == ECMAScriptFunctionObject::ThisMode::Lexical)
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env->set_this_binding_status(FunctionEnvironment::ThisBindingStatus::Lexical);
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// 4. Else, set env.[[ThisBindingStatus]] to uninitialized.
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else
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env->set_this_binding_status(FunctionEnvironment::ThisBindingStatus::Uninitialized);
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// 5. Set env.[[NewTarget]] to newTarget.
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env->set_new_target(new_target ?: js_undefined());
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// 6. Set env.[[OuterEnv]] to F.[[Environment]].
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// NOTE: Done in step 1 via the FunctionEnvironment constructor.
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// 7. Return env.
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return env;
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}
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PrivateEnvironment* new_private_environment(VM& vm, PrivateEnvironment* outer)
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{
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return vm.heap().allocate<PrivateEnvironment>(vm.current_realm()->global_object(), outer);
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}
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// 9.4.3 GetThisEnvironment ( ), https://tc39.es/ecma262/#sec-getthisenvironment
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Environment& get_this_environment(VM& vm)
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{
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for (auto* env = vm.lexical_environment(); env; env = env->outer_environment()) {
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if (env->has_this_binding())
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return *env;
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}
|
||
VERIFY_NOT_REACHED();
|
||
}
|
||
|
||
// 13.3.7.2 GetSuperConstructor ( ), https://tc39.es/ecma262/#sec-getsuperconstructor
|
||
Object* get_super_constructor(VM& vm)
|
||
{
|
||
// 1. Let envRec be GetThisEnvironment().
|
||
auto& env = get_this_environment(vm);
|
||
|
||
// 2. Assert: envRec is a function Environment Record.
|
||
// 3. Let activeFunction be envRec.[[FunctionObject]].
|
||
// 4. Assert: activeFunction is an ECMAScript function object.
|
||
auto& active_function = verify_cast<FunctionEnvironment>(env).function_object();
|
||
|
||
// 5. Let superConstructor be ! activeFunction.[[GetPrototypeOf]]().
|
||
auto* super_constructor = MUST(active_function.internal_get_prototype_of());
|
||
|
||
// 6. Return superConstructor.
|
||
return super_constructor;
|
||
}
|
||
|
||
// 13.3.7.3 MakeSuperPropertyReference ( actualThis, propertyKey, strict ), https://tc39.es/ecma262/#sec-makesuperpropertyreference
|
||
ThrowCompletionOr<Reference> make_super_property_reference(GlobalObject& global_object, Value actual_this, PropertyKey const& property_key, bool strict)
|
||
{
|
||
auto& vm = global_object.vm();
|
||
// 1. Let env be GetThisEnvironment().
|
||
auto& env = verify_cast<FunctionEnvironment>(get_this_environment(vm));
|
||
// 2. Assert: env.HasSuperBinding() is true.
|
||
VERIFY(env.has_super_binding());
|
||
// 3. Let baseValue be ? env.GetSuperBase().
|
||
auto base_value = TRY(env.get_super_base());
|
||
// 4. Let bv be ? RequireObjectCoercible(baseValue).
|
||
auto bv = TRY(require_object_coercible(global_object, base_value));
|
||
// 5. Return the Reference Record { [[Base]]: bv, [[ReferencedName]]: propertyKey, [[Strict]]: strict, [[ThisValue]]: actualThis }.
|
||
// 6. NOTE: This returns a Super Reference Record.
|
||
return Reference { bv, property_key, actual_this, strict };
|
||
}
|
||
|
||
// 19.2.1.1 PerformEval ( x, callerRealm, strictCaller, direct ), https://tc39.es/ecma262/#sec-performeval
|
||
ThrowCompletionOr<Value> perform_eval(Value x, GlobalObject& caller_realm, CallerMode strict_caller, EvalMode direct)
|
||
{
|
||
VERIFY(direct == EvalMode::Direct || strict_caller == CallerMode::NonStrict);
|
||
if (!x.is_string())
|
||
return x;
|
||
|
||
auto& vm = caller_realm.vm();
|
||
auto& eval_realm = vm.running_execution_context().realm;
|
||
|
||
auto& code_string = x.as_string();
|
||
Parser parser { Lexer { code_string.string() } };
|
||
auto program = parser.parse_program(strict_caller == CallerMode::Strict);
|
||
|
||
if (parser.has_errors()) {
|
||
auto& error = parser.errors()[0];
|
||
return vm.throw_completion<SyntaxError>(caller_realm, error.to_string());
|
||
}
|
||
|
||
auto strict_eval = strict_caller == CallerMode::Strict;
|
||
if (program->is_strict_mode())
|
||
strict_eval = true;
|
||
|
||
auto& running_context = vm.running_execution_context();
|
||
|
||
Environment* lexical_environment;
|
||
Environment* variable_environment;
|
||
PrivateEnvironment* private_environment;
|
||
if (direct == EvalMode::Direct) {
|
||
lexical_environment = new_declarative_environment(*running_context.lexical_environment);
|
||
variable_environment = running_context.variable_environment;
|
||
private_environment = running_context.private_environment;
|
||
} else {
|
||
lexical_environment = new_declarative_environment(eval_realm->global_environment());
|
||
variable_environment = &eval_realm->global_environment();
|
||
private_environment = nullptr;
|
||
}
|
||
|
||
if (strict_eval)
|
||
variable_environment = lexical_environment;
|
||
|
||
if (direct == EvalMode::Direct && !strict_eval) {
|
||
// NOTE: Non-strict direct eval() forces us to deoptimize variable accesses.
|
||
// Mark the variable environment chain as screwed since we will not be able
|
||
// to rely on cached environment coordinates from this point on.
|
||
variable_environment->set_permanently_screwed_by_eval();
|
||
}
|
||
|
||
// 18. If runningContext is not already suspended, suspend runningContext.
|
||
// FIXME: We don't have this concept yet.
|
||
|
||
ExecutionContext eval_context(vm.heap());
|
||
eval_context.realm = eval_realm;
|
||
eval_context.variable_environment = variable_environment;
|
||
eval_context.lexical_environment = lexical_environment;
|
||
eval_context.private_environment = private_environment;
|
||
vm.push_execution_context(eval_context, eval_realm->global_object());
|
||
|
||
ScopeGuard pop_guard = [&] {
|
||
vm.pop_execution_context();
|
||
};
|
||
|
||
TRY(eval_declaration_instantiation(vm, eval_realm->global_object(), program, variable_environment, lexical_environment, private_environment, strict_eval));
|
||
|
||
auto& interpreter = vm.interpreter();
|
||
TemporaryChange scope_change_strict(vm.running_execution_context().is_strict_mode, strict_eval);
|
||
// FIXME: We need to use evaluate_statements() here because Program::execute() calls global_declaration_instantiation() when it shouldn't
|
||
auto eval_result = program->evaluate_statements(interpreter, caller_realm);
|
||
|
||
if (auto* exception = vm.exception())
|
||
return throw_completion(exception->value());
|
||
else
|
||
return eval_result.value_or(js_undefined());
|
||
}
|
||
|
||
// 19.2.1.3 EvalDeclarationInstantiation ( body, varEnv, lexEnv, privateEnv, strict ), https://tc39.es/ecma262/#sec-evaldeclarationinstantiation
|
||
ThrowCompletionOr<void> eval_declaration_instantiation(VM& vm, GlobalObject& global_object, Program const& program, Environment* variable_environment, Environment* lexical_environment, PrivateEnvironment* private_environment, bool strict)
|
||
{
|
||
// FIXME: I'm not sure if the global object is correct here. And this is quite a crucial spot!
|
||
GlobalEnvironment* global_var_environment = variable_environment->is_global_environment() ? static_cast<GlobalEnvironment*>(variable_environment) : nullptr;
|
||
|
||
if (!strict) {
|
||
if (global_var_environment) {
|
||
program.for_each_var_declared_name([&](auto const& name) {
|
||
if (global_var_environment->has_lexical_declaration(name)) {
|
||
vm.throw_exception<SyntaxError>(global_object, ErrorType::TopLevelVariableAlreadyDeclared, name);
|
||
return IterationDecision::Break;
|
||
}
|
||
return IterationDecision::Continue;
|
||
});
|
||
}
|
||
|
||
auto* this_environment = lexical_environment;
|
||
while (this_environment != variable_environment) {
|
||
if (!is<ObjectEnvironment>(*this_environment)) {
|
||
program.for_each_var_declared_name([&](auto const& name) {
|
||
if (MUST(this_environment->has_binding(name))) {
|
||
vm.throw_exception<SyntaxError>(global_object, ErrorType::TopLevelVariableAlreadyDeclared, name);
|
||
return IterationDecision::Break;
|
||
}
|
||
// FIXME: NOTE: Annex B.3.4 defines alternate semantics for the above step.
|
||
// In particular it only throw the syntax error if it is not an environment from a catchclause.
|
||
return IterationDecision::Continue;
|
||
});
|
||
if (auto* exception = vm.exception())
|
||
return throw_completion(exception->value());
|
||
}
|
||
|
||
this_environment = this_environment->outer_environment();
|
||
VERIFY(this_environment);
|
||
}
|
||
}
|
||
|
||
// FIXME: Add Private identifiers check here.
|
||
|
||
HashTable<FlyString> declared_function_names;
|
||
Vector<FunctionDeclaration const&> functions_to_initialize;
|
||
program.for_each_var_function_declaration_in_reverse_order([&](FunctionDeclaration const& function) {
|
||
if (declared_function_names.set(function.name()) != AK::HashSetResult::InsertedNewEntry)
|
||
return IterationDecision::Continue;
|
||
|
||
if (global_var_environment) {
|
||
auto function_definable = global_var_environment->can_declare_global_function(function.name());
|
||
if (vm.exception())
|
||
return IterationDecision::Break;
|
||
if (!function_definable) {
|
||
vm.throw_exception<TypeError>(global_object, ErrorType::CannotDeclareGlobalFunction, function.name());
|
||
return IterationDecision::Break;
|
||
}
|
||
}
|
||
functions_to_initialize.append(function);
|
||
return IterationDecision::Continue;
|
||
});
|
||
|
||
if (auto* exception = vm.exception())
|
||
return throw_completion(exception->value());
|
||
|
||
if (!strict) {
|
||
// The spec here uses 'declaredVarNames' but that has not been declared yet.
|
||
HashTable<FlyString> hoisted_functions;
|
||
program.for_each_function_hoistable_with_annexB_extension([&](FunctionDeclaration& function_declaration) {
|
||
auto& function_name = function_declaration.name();
|
||
auto* this_environment = lexical_environment;
|
||
|
||
while (this_environment != variable_environment) {
|
||
if (!is<ObjectEnvironment>(*this_environment) && MUST(this_environment->has_binding(function_name)))
|
||
return IterationDecision::Continue;
|
||
|
||
this_environment = this_environment->outer_environment();
|
||
VERIFY(this_environment);
|
||
}
|
||
|
||
if (global_var_environment) {
|
||
if (global_var_environment->has_lexical_declaration(function_name))
|
||
return IterationDecision::Continue;
|
||
auto var_definable = global_var_environment->can_declare_global_var(function_name);
|
||
if (vm.exception())
|
||
return IterationDecision::Break;
|
||
if (!var_definable)
|
||
return IterationDecision::Continue;
|
||
}
|
||
|
||
if (!declared_function_names.contains(function_name) && !hoisted_functions.contains(function_name)) {
|
||
if (global_var_environment) {
|
||
global_var_environment->create_global_var_binding(function_name, true);
|
||
if (vm.exception())
|
||
return IterationDecision::Break;
|
||
} else {
|
||
if (!MUST(variable_environment->has_binding(function_name))) {
|
||
MUST(variable_environment->create_mutable_binding(global_object, function_name, true));
|
||
MUST(variable_environment->initialize_binding(global_object, function_name, js_undefined()));
|
||
}
|
||
}
|
||
|
||
hoisted_functions.set(function_name);
|
||
}
|
||
|
||
function_declaration.set_should_do_additional_annexB_steps();
|
||
|
||
return IterationDecision::Continue;
|
||
});
|
||
|
||
if (auto* exception = vm.exception())
|
||
return throw_completion(exception->value());
|
||
}
|
||
|
||
HashTable<FlyString> declared_var_names;
|
||
|
||
program.for_each_var_scoped_variable_declaration([&](VariableDeclaration const& declaration) {
|
||
declaration.for_each_bound_name([&](auto const& name) {
|
||
if (!declared_function_names.contains(name)) {
|
||
if (global_var_environment) {
|
||
auto variable_definable = global_var_environment->can_declare_global_var(name);
|
||
if (vm.exception())
|
||
return IterationDecision::Break;
|
||
if (!variable_definable) {
|
||
vm.throw_exception<TypeError>(global_object, ErrorType::CannotDeclareGlobalVariable, name);
|
||
return IterationDecision::Break;
|
||
}
|
||
}
|
||
declared_var_names.set(name);
|
||
}
|
||
return IterationDecision::Continue;
|
||
});
|
||
if (vm.exception())
|
||
return IterationDecision::Break;
|
||
return IterationDecision::Continue;
|
||
});
|
||
|
||
if (auto* exception = vm.exception())
|
||
return throw_completion(exception->value());
|
||
|
||
// 14. NOTE: No abnormal terminations occur after this algorithm step unless varEnv is a global Environment Record and the global object is a Proxy exotic object.
|
||
|
||
program.for_each_lexically_scoped_declaration([&](Declaration const& declaration) {
|
||
declaration.for_each_bound_name([&](auto const& name) {
|
||
if (declaration.is_constant_declaration())
|
||
(void)lexical_environment->create_immutable_binding(global_object, name, true);
|
||
else
|
||
(void)lexical_environment->create_mutable_binding(global_object, name, false);
|
||
if (vm.exception())
|
||
return IterationDecision::Break;
|
||
return IterationDecision::Continue;
|
||
});
|
||
if (vm.exception())
|
||
return IterationDecision::Break;
|
||
return IterationDecision::Continue;
|
||
});
|
||
|
||
if (auto* exception = vm.exception())
|
||
return throw_completion(exception->value());
|
||
|
||
for (auto& declaration : functions_to_initialize) {
|
||
auto* function = ECMAScriptFunctionObject::create(global_object, declaration.name(), declaration.body(), declaration.parameters(), declaration.function_length(), lexical_environment, private_environment, declaration.kind(), declaration.is_strict_mode(), declaration.might_need_arguments_object());
|
||
if (global_var_environment) {
|
||
global_var_environment->create_global_function_binding(declaration.name(), function, true);
|
||
if (auto* exception = vm.exception())
|
||
return throw_completion(exception->value());
|
||
} else {
|
||
auto binding_exists = MUST(variable_environment->has_binding(declaration.name()));
|
||
|
||
if (!binding_exists) {
|
||
TRY(variable_environment->create_mutable_binding(global_object, declaration.name(), true));
|
||
TRY(variable_environment->initialize_binding(global_object, declaration.name(), function));
|
||
} else {
|
||
TRY(variable_environment->set_mutable_binding(global_object, declaration.name(), function, false));
|
||
}
|
||
}
|
||
}
|
||
|
||
for (auto& var_name : declared_var_names) {
|
||
if (global_var_environment) {
|
||
global_var_environment->create_global_var_binding(var_name, true);
|
||
if (auto* exception = vm.exception())
|
||
return throw_completion(exception->value());
|
||
} else {
|
||
auto binding_exists = MUST(variable_environment->has_binding(var_name));
|
||
|
||
if (!binding_exists) {
|
||
TRY(variable_environment->create_mutable_binding(global_object, var_name, true));
|
||
TRY(variable_environment->initialize_binding(global_object, var_name, js_undefined()));
|
||
}
|
||
}
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
// 10.4.4.6 CreateUnmappedArgumentsObject ( argumentsList ), https://tc39.es/ecma262/#sec-createunmappedargumentsobject
|
||
Object* create_unmapped_arguments_object(GlobalObject& global_object, Span<Value> arguments)
|
||
{
|
||
auto& vm = global_object.vm();
|
||
|
||
// 1. Let len be the number of elements in argumentsList.
|
||
auto length = arguments.size();
|
||
|
||
// 2. Let obj be ! OrdinaryObjectCreate(%Object.prototype%, « [[ParameterMap]] »).
|
||
// 3. Set obj.[[ParameterMap]] to undefined.
|
||
auto* object = Object::create(global_object, global_object.object_prototype());
|
||
object->set_has_parameter_map();
|
||
|
||
// 4. Perform DefinePropertyOrThrow(obj, "length", PropertyDescriptor { [[Value]]: 𝔽(len), [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true }).
|
||
MUST(object->define_property_or_throw(vm.names.length, { .value = Value(length), .writable = true, .enumerable = false, .configurable = true }));
|
||
|
||
// 5. Let index be 0.
|
||
// 6. Repeat, while index < len,
|
||
for (size_t index = 0; index < length; ++index) {
|
||
// a. Let val be argumentsList[index].
|
||
auto value = arguments[index];
|
||
|
||
// b. Perform ! CreateDataPropertyOrThrow(obj, ! ToString(𝔽(index)), val).
|
||
MUST(object->create_data_property_or_throw(index, value));
|
||
|
||
// c. Set index to index + 1.
|
||
}
|
||
|
||
// 7. Perform ! DefinePropertyOrThrow(obj, @@iterator, PropertyDescriptor { [[Value]]: %Array.prototype.values%, [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true }).
|
||
auto* array_prototype_values = global_object.array_prototype_values_function();
|
||
MUST(object->define_property_or_throw(*vm.well_known_symbol_iterator(), { .value = array_prototype_values, .writable = true, .enumerable = false, .configurable = true }));
|
||
|
||
// 8. Perform ! DefinePropertyOrThrow(obj, "callee", PropertyDescriptor { [[Get]]: %ThrowTypeError%, [[Set]]: %ThrowTypeError%, [[Enumerable]]: false, [[Configurable]]: false }).
|
||
auto* throw_type_error = global_object.throw_type_error_function();
|
||
MUST(object->define_property_or_throw(vm.names.callee, { .get = throw_type_error, .set = throw_type_error, .enumerable = false, .configurable = false }));
|
||
|
||
// 9. Return obj.
|
||
return object;
|
||
}
|
||
|
||
// 10.4.4.7 CreateMappedArgumentsObject ( func, formals, argumentsList, env ), https://tc39.es/ecma262/#sec-createmappedargumentsobject
|
||
Object* create_mapped_arguments_object(GlobalObject& global_object, FunctionObject& function, Vector<FunctionNode::Parameter> const& formals, Span<Value> arguments, Environment& environment)
|
||
{
|
||
auto& vm = global_object.vm();
|
||
|
||
// 1. Assert: formals does not contain a rest parameter, any binding patterns, or any initializers. It may contain duplicate identifiers.
|
||
|
||
// 2. Let len be the number of elements in argumentsList.
|
||
VERIFY(arguments.size() <= NumericLimits<i32>::max());
|
||
i32 length = static_cast<i32>(arguments.size());
|
||
|
||
// 3. Let obj be ! MakeBasicObject(« [[Prototype]], [[Extensible]], [[ParameterMap]] »).
|
||
// 4. Set obj.[[GetOwnProperty]] as specified in 10.4.4.1.
|
||
// 5. Set obj.[[DefineOwnProperty]] as specified in 10.4.4.2.
|
||
// 6. Set obj.[[Get]] as specified in 10.4.4.3.
|
||
// 7. Set obj.[[Set]] as specified in 10.4.4.4.
|
||
// 8. Set obj.[[Delete]] as specified in 10.4.4.5.
|
||
// 9. Set obj.[[Prototype]] to %Object.prototype%.
|
||
auto* object = vm.heap().allocate<ArgumentsObject>(global_object, global_object, environment);
|
||
VERIFY(!vm.exception());
|
||
|
||
// 14. Let index be 0.
|
||
// 15. Repeat, while index < len,
|
||
for (i32 index = 0; index < length; ++index) {
|
||
// a. Let val be argumentsList[index].
|
||
auto value = arguments[index];
|
||
|
||
// b. Perform ! CreateDataPropertyOrThrow(obj, ! ToString(𝔽(index)), val).
|
||
MUST(object->create_data_property_or_throw(index, value));
|
||
|
||
// c. Set index to index + 1.
|
||
}
|
||
|
||
// 16. Perform ! DefinePropertyOrThrow(obj, "length", PropertyDescriptor { [[Value]]: 𝔽(len), [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true }).
|
||
MUST(object->define_property_or_throw(vm.names.length, { .value = Value(length), .writable = true, .enumerable = false, .configurable = true }));
|
||
|
||
// 17. Let mappedNames be a new empty List.
|
||
HashTable<FlyString> mapped_names;
|
||
|
||
// 18. Set index to numberOfParameters - 1.
|
||
// 19. Repeat, while index ≥ 0,
|
||
VERIFY(formals.size() <= NumericLimits<i32>::max());
|
||
for (i32 index = static_cast<i32>(formals.size()) - 1; index >= 0; --index) {
|
||
// a. Let name be parameterNames[index].
|
||
auto const& name = formals[index].binding.get<FlyString>();
|
||
|
||
// b. If name is not an element of mappedNames, then
|
||
if (mapped_names.contains(name))
|
||
continue;
|
||
|
||
// i. Add name as an element of the list mappedNames.
|
||
mapped_names.set(name);
|
||
|
||
// ii. If index < len, then
|
||
if (index < length) {
|
||
// 1. Let g be MakeArgGetter(name, env).
|
||
// 2. Let p be MakeArgSetter(name, env).
|
||
// 3. Perform map.[[DefineOwnProperty]](! ToString(𝔽(index)), PropertyDescriptor { [[Set]]: p, [[Get]]: g, [[Enumerable]]: false, [[Configurable]]: true }).
|
||
object->parameter_map().define_old_native_accessor(
|
||
PropertyKey { index },
|
||
[&environment, name](VM&, GlobalObject& global_object_getter) -> Value {
|
||
return MUST(environment.get_binding_value(global_object_getter, name, false));
|
||
},
|
||
[&environment, name](VM& vm, GlobalObject& global_object_setter) {
|
||
MUST(environment.set_mutable_binding(global_object_setter, name, vm.argument(0), false));
|
||
return js_undefined();
|
||
},
|
||
Attribute::Configurable);
|
||
}
|
||
}
|
||
|
||
// 20. Perform ! DefinePropertyOrThrow(obj, @@iterator, PropertyDescriptor { [[Value]]: %Array.prototype.values%, [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true }).
|
||
auto* array_prototype_values = global_object.array_prototype_values_function();
|
||
MUST(object->define_property_or_throw(*vm.well_known_symbol_iterator(), { .value = array_prototype_values, .writable = true, .enumerable = false, .configurable = true }));
|
||
|
||
// 21. Perform ! DefinePropertyOrThrow(obj, "callee", PropertyDescriptor { [[Value]]: func, [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true }).
|
||
MUST(object->define_property_or_throw(vm.names.callee, { .value = &function, .writable = true, .enumerable = false, .configurable = true }));
|
||
|
||
// 22. Return obj.
|
||
return object;
|
||
}
|
||
|
||
// 7.1.21 CanonicalNumericIndexString ( argument ), https://tc39.es/ecma262/#sec-canonicalnumericindexstring
|
||
Value canonical_numeric_index_string(GlobalObject& global_object, PropertyKey const& property_name)
|
||
{
|
||
// NOTE: If the property name is a number type (An implementation-defined optimized
|
||
// property key type), it can be treated as a string property that has already been
|
||
// converted successfully into a canonical numeric index.
|
||
|
||
VERIFY(property_name.is_string() || property_name.is_number());
|
||
|
||
if (property_name.is_number())
|
||
return Value(property_name.as_number());
|
||
|
||
// 1. Assert: Type(argument) is String.
|
||
auto argument = Value(js_string(global_object.vm(), property_name.as_string()));
|
||
|
||
// 2. If argument is "-0", return -0𝔽.
|
||
if (argument.as_string().string() == "-0")
|
||
return Value(-0.0);
|
||
|
||
// 3. Let n be ! ToNumber(argument).
|
||
auto n = MUST(argument.to_number(global_object));
|
||
|
||
// 4. If SameValue(! ToString(n), argument) is false, return undefined.
|
||
if (!same_value(MUST(n.to_primitive_string(global_object)), argument))
|
||
return js_undefined();
|
||
|
||
// 5. Return n.
|
||
return n;
|
||
}
|
||
|
||
// 22.1.3.17.1 GetSubstitution ( matched, str, position, captures, namedCaptures, replacement ), https://tc39.es/ecma262/#sec-getsubstitution
|
||
ThrowCompletionOr<String> get_substitution(GlobalObject& global_object, Utf16View const& matched, Utf16View const& str, size_t position, Span<Value> captures, Value named_captures, Value replacement)
|
||
{
|
||
auto replace_string = TRY(replacement.to_utf16_string(global_object));
|
||
auto replace_view = replace_string.view();
|
||
|
||
StringBuilder result;
|
||
|
||
for (size_t i = 0; i < replace_view.length_in_code_units(); ++i) {
|
||
u16 curr = replace_view.code_unit_at(i);
|
||
|
||
if ((curr != '$') || (i + 1 >= replace_view.length_in_code_units())) {
|
||
result.append(curr);
|
||
continue;
|
||
}
|
||
|
||
u16 next = replace_view.code_unit_at(i + 1);
|
||
|
||
if (next == '$') {
|
||
result.append('$');
|
||
++i;
|
||
} else if (next == '&') {
|
||
result.append(matched);
|
||
++i;
|
||
} else if (next == '`') {
|
||
auto substring = str.substring_view(0, position);
|
||
result.append(substring);
|
||
++i;
|
||
} else if (next == '\'') {
|
||
auto tail_pos = position + matched.length_in_code_units();
|
||
if (tail_pos < str.length_in_code_units()) {
|
||
auto substring = str.substring_view(tail_pos);
|
||
result.append(substring);
|
||
}
|
||
++i;
|
||
} else if (is_ascii_digit(next)) {
|
||
bool is_two_digits = (i + 2 < replace_view.length_in_code_units()) && is_ascii_digit(replace_view.code_unit_at(i + 2));
|
||
|
||
auto capture_postition_string = replace_view.substring_view(i + 1, is_two_digits ? 2 : 1).to_utf8();
|
||
auto capture_position = capture_postition_string.to_uint();
|
||
|
||
if (capture_position.has_value() && (*capture_position > 0) && (*capture_position <= captures.size())) {
|
||
auto& value = captures[*capture_position - 1];
|
||
|
||
if (!value.is_undefined()) {
|
||
auto value_string = TRY(value.to_string(global_object));
|
||
result.append(value_string);
|
||
}
|
||
|
||
i += is_two_digits ? 2 : 1;
|
||
} else {
|
||
result.append(curr);
|
||
}
|
||
} else if (next == '<') {
|
||
auto start_position = i + 2;
|
||
Optional<size_t> end_position;
|
||
|
||
for (size_t j = start_position; j < replace_view.length_in_code_units(); ++j) {
|
||
if (replace_view.code_unit_at(j) == '>') {
|
||
end_position = j;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (named_captures.is_undefined() || !end_position.has_value()) {
|
||
result.append(curr);
|
||
} else {
|
||
auto group_name_view = replace_view.substring_view(start_position, *end_position - start_position);
|
||
auto group_name = group_name_view.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes);
|
||
|
||
auto capture = TRY(named_captures.as_object().get(group_name));
|
||
|
||
if (!capture.is_undefined()) {
|
||
auto capture_string = TRY(capture.to_string(global_object));
|
||
result.append(capture_string);
|
||
}
|
||
|
||
i = *end_position;
|
||
}
|
||
} else {
|
||
result.append(curr);
|
||
}
|
||
}
|
||
|
||
return result.build();
|
||
}
|
||
|
||
}
|