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0a1c9e4038
Aligning with the editorial change in the spec of: https://github.com/tc39/ecma262/commit/977a6c
105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
/*
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* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2022, Andreas Kling <andreas@ladybird.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/TypeCasts.h>
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#include <LibJS/Heap/DeferGC.h>
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#include <LibJS/Runtime/GlobalEnvironment.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Realm.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS {
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JS_DEFINE_ALLOCATOR(Realm);
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// 9.3.1 InitializeHostDefinedRealm ( ), https://tc39.es/ecma262/#sec-initializehostdefinedrealm
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ThrowCompletionOr<NonnullOwnPtr<ExecutionContext>> Realm::initialize_host_defined_realm(VM& vm, Function<Object*(Realm&)> create_global_object, Function<Object*(Realm&)> create_global_this_value)
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{
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DeferGC defer_gc(vm.heap());
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// 1. Let realm be a new Realm Record
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auto realm = vm.heap().allocate_without_realm<Realm>();
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// 2. Perform CreateIntrinsics(realm).
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MUST(Intrinsics::create(*realm));
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// FIXME: 3. Set realm.[[AgentSignifier]] to AgentSignifier().
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// NOTE: Done on step 1.
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// 4. Set realm.[[GlobalObject]] to undefined.
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// 5. Set realm.[[GlobalEnv]] to undefined.
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// FIXME: 6. Set realm.[[TemplateMap]] to a new empty List.
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// 7. Let newContext be a new execution context.
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auto new_context = ExecutionContext::create();
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// 8. Set the Function of newContext to null.
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new_context->function = nullptr;
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// 9. Set the Realm of newContext to realm.
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new_context->realm = realm;
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// 10. Set the ScriptOrModule of newContext to null.
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new_context->script_or_module = {};
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// 11. Push newContext onto the execution context stack; newContext is now the running execution context.
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vm.push_execution_context(*new_context);
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// 12. If the host requires use of an exotic object to serve as realm's global object, then
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Object* global = nullptr;
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if (create_global_object) {
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// a. Let global be such an object created in a host-defined manner.
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global = create_global_object(*realm);
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}
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// 13. Else,
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else {
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// a. Let global be OrdinaryObjectCreate(realm.[[Intrinsics]].[[%Object.prototype%]]).
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// NOTE: We allocate a proper GlobalObject directly as this plain object is
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// turned into one via SetDefaultGlobalBindings in the spec.
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global = vm.heap().allocate_without_realm<GlobalObject>(realm);
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}
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// 14. If the host requires that the this binding in realm's global scope return an object other than the global object, then
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Object* this_value = nullptr;
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if (create_global_this_value) {
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// a. Let thisValue be such an object created in a host-defined manner.
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this_value = create_global_this_value(*realm);
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}
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// 15. Else,
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else {
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// a. Let thisValue be global.
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this_value = global;
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}
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// 16. Set realm.[[GlobalObject]] to global.
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realm->m_global_object = global;
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// 17. Set realm.[[GlobalEnv]] to NewGlobalEnvironment(global, thisValue).
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realm->m_global_environment = vm.heap().allocate_without_realm<GlobalEnvironment>(*global, *this_value);
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// 18. Perform ? SetDefaultGlobalBindings(realm).
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set_default_global_bindings(*realm);
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// 19. Create any host-defined global object properties on global.
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global->initialize(*realm);
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// 20. Return unused.
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return new_context;
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}
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void Realm::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_intrinsics);
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visitor.visit(m_global_object);
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visitor.visit(m_global_environment);
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if (m_host_defined)
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m_host_defined->visit_edges(visitor);
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}
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}
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