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d1fc76bffd
This implements the proposed update to the ShadowRealm proposal for integrating the ShadowRealm specification into the web platform.
89 lines
3.4 KiB
C++
89 lines
3.4 KiB
C++
/*
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* Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2024, Shannon Booth <shannon@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/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/ShadowRealm.h>
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#include <LibJS/Runtime/ShadowRealmConstructor.h>
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namespace JS {
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JS_DEFINE_ALLOCATOR(ShadowRealmConstructor);
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// 3.2 The ShadowRealm Constructor, https://tc39.es/proposal-shadowrealm/#sec-shadowrealm-constructor
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ShadowRealmConstructor::ShadowRealmConstructor(Realm& realm)
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: NativeFunction(realm.vm().names.ShadowRealm.as_string(), realm.intrinsics().function_prototype())
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{
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}
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void ShadowRealmConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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Base::initialize(realm);
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// 3.3.1 ShadowRealm.prototype, https://tc39.es/proposal-shadowrealm/#sec-shadowrealm.prototype
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define_direct_property(vm.names.prototype, realm.intrinsics().shadow_realm_prototype(), 0);
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define_direct_property(vm.names.length, Value(0), Attribute::Configurable);
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}
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// 3.2.1 ShadowRealm ( ), https://tc39.es/proposal-shadowrealm/#sec-shadowrealm
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ThrowCompletionOr<Value> ShadowRealmConstructor::call()
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{
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auto& vm = this->vm();
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// 1. If NewTarget is undefined, throw a TypeError exception.
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return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.ShadowRealm);
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}
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// https://github.com/tc39/proposal-shadowrealm/pull/392
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static ThrowCompletionOr<NonnullGCPtr<Object>> initialize_shadow_realm(ShadowRealm& object)
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{
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auto& vm = object.vm();
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// 1. Let context be the running Javascript execution context.
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auto& context = vm.running_execution_context();
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// 2. Let realm be the Realm of context.
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auto& realm = *context.realm;
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// 3. Return ? HostInitializeShadowRealm(realm, context, O).
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if (vm.host_initialize_shadow_realm)
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return TRY(vm.host_initialize_shadow_realm(realm, context.copy(), object));
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// AD-HOC: Fallback for when there is no host defined implementation.
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vm.pop_execution_context();
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object.set_execution_context(vm.running_execution_context().copy());
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object.set_shadow_realm(*vm.running_execution_context().realm);
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return Object::create(realm, realm.intrinsics().object_prototype());
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}
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// 3.2.1 ShadowRealm ( ), https://tc39.es/proposal-shadowrealm/#sec-shadowrealm
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// https://github.com/tc39/proposal-shadowrealm/pull/392
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ThrowCompletionOr<NonnullGCPtr<Object>> ShadowRealmConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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// 2. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%ShadowRealm.prototype%", « [[ShadowRealm]], [[ExecutionContext]] »).
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auto object = TRY(ordinary_create_from_constructor<ShadowRealm>(vm, new_target, &Intrinsics::shadow_realm_prototype));
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// 3. Perform ? InitializeHostDefinedRealm(). The customizations for creating the global object are to return ? InitializeShadowRealm().
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// 4. Let context be the running Javascript execution context.
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auto context = TRY(Realm::initialize_host_defined_realm(vm, [&object](JS::Realm&) -> JS::Object* { return MUST(initialize_shadow_realm(object)); }, nullptr));
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// 5. Set O.[[ExecutionContext]] to context.
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// 6. Let realmRec be the Realm of context.
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auto& realm_record = *context->realm;
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object->set_execution_context(move(context));
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// 7. Set O.[[ShadowRealm]] to realmRec.
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object->set_shadow_realm(realm_record);
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// 8. Return O.
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return object;
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}
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}
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