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/*
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/TypeCasts.h>
#include <LibJS/Heap/DeferGC.h>
#include <LibJS/Runtime/GlobalEnvironment.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/VM.h>
namespace JS {
// 9.3.1 CreateRealm ( ), https://tc39.es/ecma262/#sec-createrealm
NonnullGCPtr<Realm> Realm::create(VM& vm)
{
// 1. Let realmRec be a new Realm Record.
auto realm = vm.heap().allocate_without_realm<Realm>();
// 2. Perform CreateIntrinsics(realmRec).
Intrinsics::create(*realm);
// 3. Set realmRec.[[GlobalObject]] to undefined.
// 4. Set realmRec.[[GlobalEnv]] to undefined.
// 5. Set realmRec.[[TemplateMap]] to a new empty List.
// 6. Return realmRec.
return realm;
}
// 9.6 InitializeHostDefinedRealm ( ), https://tc39.es/ecma262/#sec-initializehostdefinedrealm
ThrowCompletionOr<NonnullOwnPtr<ExecutionContext>> Realm::initialize_host_defined_realm(VM& vm, Function<Object*(Realm&)> create_global_object, Function<Object*(Realm&)> create_global_this_value)
{
DeferGC defer_gc(vm.heap());
// 1. Let realm be CreateRealm().
auto realm = Realm::create(vm);
// 2. Let newContext be a new execution context.
auto new_context = make<ExecutionContext>(vm.heap());
// 3. Set the Function of newContext to null.
new_context->function = nullptr;
// 4. Set the Realm of newContext to realm.
new_context->realm = realm;
// 5. Set the ScriptOrModule of newContext to null.
new_context->script_or_module = {};
// 6. Push newContext onto the execution context stack; newContext is now the running execution context.
vm.push_execution_context(*new_context);
// 7. If the host requires use of an exotic object to serve as realm's global object,
// let global be such an object created in a host-defined manner.
// Otherwise, let global be undefined, indicating that an ordinary object should be created as the global object.
Object* global = nullptr;
if (create_global_object)
global = create_global_object(*realm);
// 8. If the host requires that the this binding in realm's global scope return an object other than the global object,
// let thisValue be such an object created in a host-defined manner.
// Otherwise, let thisValue be undefined, indicating that realm's global this binding should be the global object.
Object* this_value = nullptr;
if (create_global_this_value)
this_value = create_global_this_value(*realm);
// 9. Perform SetRealmGlobalObject(realm, global, thisValue).
realm->set_global_object(global, this_value);
// 10. Let globalObj be ? SetDefaultGlobalBindings(realm).
auto& global_object = set_default_global_bindings(*realm);
// 11. Create any host-defined global object properties on globalObj.
global_object.initialize(*realm);
// 12. Return unused.
return new_context;
}
// 9.3.3 SetRealmGlobalObject ( realmRec, globalObj, thisValue ), https://tc39.es/ecma262/#sec-setrealmglobalobject
void Realm::set_global_object(Object* global_object, Object* this_value)
{
// 1. If globalObj is undefined, then
if (global_object == nullptr) {
// a. Let intrinsics be realmRec.[[Intrinsics]].
// b. Set globalObj to OrdinaryObjectCreate(intrinsics.[[%Object.prototype%]]).
// NOTE: We allocate a proper GlobalObject directly as this plain object is
// turned into one via SetDefaultGlobalBindings in the spec.
global_object = heap().allocate_without_realm<GlobalObject>(*this);
}
// 2. Assert: Type(globalObj) is Object.
VERIFY(global_object);
// 3. If thisValue is undefined, set thisValue to globalObj.
if (this_value == nullptr)
this_value = global_object;
// Non-standard
VERIFY(this_value);
// 4. Set realmRec.[[GlobalObject]] to globalObj.
m_global_object = global_object;
// 5. Let newGlobalEnv be NewGlobalEnvironment(globalObj, thisValue).
// 6. Set realmRec.[[GlobalEnv]] to newGlobalEnv.
m_global_environment = m_global_object->heap().allocate_without_realm<GlobalEnvironment>(*global_object, *this_value);
// 7. Return unused.
}
void Realm::visit_edges(Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_intrinsics);
visitor.visit(m_global_object);
visitor.visit(m_global_environment);
if (m_host_defined)
m_host_defined->visit_edges(visitor);
}
}
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