e992a9f469
This is a continuation of the previous three commits. Now that create() receives the allocating realm, we can simply forward that to allocate(), which accounts for the majority of these changes. Additionally, we can get rid of the realm_from_global_object() in one place, with one more remaining in VM::throw_completion().
114 lines
4.2 KiB
C++
114 lines
4.2 KiB
C++
/*
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* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2022, 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/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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// 9.3.1 CreateRealm ( ), https://tc39.es/ecma262/#sec-createrealm
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Realm* Realm::create(VM& vm)
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{
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return vm.heap().allocate_without_realm<Realm>();
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}
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// 9.6 InitializeHostDefinedRealm ( ), https://tc39.es/ecma262/#sec-initializehostdefinedrealm
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ThrowCompletionOr<NonnullOwnPtr<ExecutionContext>> Realm::initialize_host_defined_realm(VM& vm, Function<GlobalObject*(Realm&)> create_global_object, Function<GlobalObject*(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 CreateRealm().
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auto* realm = Realm::create(vm);
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// 2. Let newContext be a new execution context.
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auto new_context = make<ExecutionContext>(vm.heap());
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// 3. Set the Function of newContext to null.
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new_context->function = nullptr;
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// 4. Set the Realm of newContext to realm.
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new_context->realm = realm;
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// 5. Set the ScriptOrModule of newContext to null.
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new_context->script_or_module = {};
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// 6. 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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// 7. If the host requires use of an exotic object to serve as realm's global object,
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// let global be such an object created in a host-defined manner.
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// Otherwise, let global be undefined, indicating that an ordinary object should be created as the global object.
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GlobalObject* global = nullptr;
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if (create_global_object)
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global = create_global_object(*realm);
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// 8. If the host requires that the this binding in realm's global scope return an object other than the global object,
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// let thisValue be such an object created in a host-defined manner.
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// Otherwise, let thisValue be undefined, indicating that realm's global this binding should be the global object.
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GlobalObject* this_value = nullptr;
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if (create_global_this_value)
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this_value = create_global_this_value(*realm);
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// 9. Perform SetRealmGlobalObject(realm, global, thisValue).
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realm->set_global_object(global, this_value);
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// NOTE: Steps 10 & 11 are somewhat ad-hoc, since we store intrinsics on the global object.
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// 10. Let globalObj be ? SetDefaultGlobalBindings(realm).
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// 11. Create any host-defined global object properties on globalObj.
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realm->global_object().initialize_global_object();
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// 12. Return unused.
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return new_context;
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}
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// 9.3.3 SetRealmGlobalObject ( realmRec, globalObj, thisValue ), https://tc39.es/ecma262/#sec-setrealmglobalobject
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void Realm::set_global_object(GlobalObject* global_object, GlobalObject* this_value)
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{
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// 1. If globalObj is undefined, then
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if (global_object == nullptr) {
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// a. Let intrinsics be realmRec.[[Intrinsics]].
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// b. Set globalObj to OrdinaryObjectCreate(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_object = heap().allocate_without_realm<GlobalObject>(*this);
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}
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// 2. Assert: Type(globalObj) is Object.
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VERIFY(global_object);
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// Non-standard
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global_object->set_associated_realm(*this);
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// 3. If thisValue is undefined, set thisValue to globalObj.
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if (this_value == nullptr)
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this_value = global_object;
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// Non-standard
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VERIFY(this_value);
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// 4. Set realmRec.[[GlobalObject]] to globalObj.
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m_global_object = global_object;
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// 5. Let newGlobalEnv be NewGlobalEnvironment(globalObj, thisValue).
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// 6. Set realmRec.[[GlobalEnv]] to newGlobalEnv.
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m_global_environment = m_global_object->heap().allocate_without_realm<GlobalEnvironment>(*global_object, *this_value);
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// 7. Return unused.
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}
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void Realm::visit_edges(Visitor& visitor)
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{
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visitor.visit(m_global_object);
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visitor.visit(m_global_environment);
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}
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}
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