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https://github.com/LadybirdBrowser/ladybird.git
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7002c47ce1
The additional data being passed will be used in an upcoming commit. Allows splitting the churn of modified function signatures from the logically meaningful code change. No behavior change.
114 lines
3.8 KiB
C++
114 lines
3.8 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 <LibGC/DeferGC.h>
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#include <LibJS/Runtime/DeclarativeEnvironment.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/NativeFunction.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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GC_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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GC::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<Realm>();
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// 2. Perform CreateIntrinsics(realm).
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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(0, ReadonlySpan<Value> {}, 0);
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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<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->set_global_environment(vm.heap().allocate<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::set_global_environment(GC::Ref<GlobalEnvironment> environment)
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{
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m_global_environment = environment;
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m_global_declarative_environment = &environment->declarative_record();
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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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visitor.visit(m_global_declarative_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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