Auto merge of #22353 - jdm:runtime-parent, r=nox

Update rust-mozjs

These changes adjust our uses of the rust-mozjs APIs to accommodate the changes in https://github.com/servo/rust-mozjs/pull/450.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #22342.
- [x] There are tests for these changes

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/22353)
<!-- Reviewable:end -->

components/script/dom/bindings/codegen/CodegenRust.py

@@ -2592,7 +2592,7 @@ class CGConstructorEnabled(CGAbstractMethod):
         return CGList((CGGeneric(cond) for cond in conditions), " &&\n")
 
 
-def CreateBindingJSObject(descriptor, parent=None):
+def CreateBindingJSObject(descriptor):
     assert not descriptor.isGlobal()
     create = "let raw = Box::into_raw(object);\nlet _rt = RootedTraceable::new(&*raw);\n"
     if descriptor.proxy:
@@ -2601,12 +2601,11 @@ let handler = RegisterBindings::PROXY_HANDLERS[PrototypeList::Proxies::%s as usi
 rooted!(in(cx) let private = PrivateValue(raw as *const libc::c_void));
 let obj = NewProxyObject(cx, handler,
                          Handle::from_raw(UndefinedHandleValue),
-                         proto.get(), %s.get(),
-                         ptr::null_mut(), ptr::null_mut());
+                         proto.get());
 assert!(!obj.is_null());
 SetProxyReservedSlot(obj, 0, &private.get());
 rooted!(in(cx) let obj = obj);\
-""" % (descriptor.name, parent)
+""" % (descriptor.name)
     else:
         create += ("rooted!(in(cx) let obj = JS_NewObjectWithGivenProto(\n"
                    "    cx, &Class.base as *const JSClass, proto.handle()));\n"
@@ -2699,7 +2698,7 @@ class CGWrapMethod(CGAbstractMethod):
 
     def definition_body(self):
         unforgeable = CopyUnforgeablePropertiesToInstance(self.descriptor)
-        create = CreateBindingJSObject(self.descriptor, "scope")
+        create = CreateBindingJSObject(self.descriptor)
         return CGGeneric("""\
 let scope = scope.reflector().get_jsobject();
 assert!(!scope.get().is_null());

components/script/dom/dedicatedworkerglobalscope.rs

@@ -23,7 +23,7 @@ use crate::dom::messageevent::MessageEvent;
 use crate::dom::worker::{TrustedWorkerAddress, Worker};
 use crate::dom::workerglobalscope::WorkerGlobalScope;
 use crate::script_runtime::ScriptThreadEventCategory::WorkerEvent;
-use crate::script_runtime::{new_rt_and_cx, CommonScriptMsg, Runtime, ScriptChan, ScriptPort};
+use crate::script_runtime::{new_child_runtime, CommonScriptMsg, Runtime, ScriptChan, ScriptPort};
 use crate::task_queue::{QueuedTask, QueuedTaskConversion, TaskQueue};
 use crate::task_source::TaskSourceName;
 use crossbeam_channel::{unbounded, Receiver, Sender};
@@ -272,11 +272,9 @@ impl DedicatedWorkerGlobalScope {
         let serialized_worker_url = worker_url.to_string();
         let name = format!("WebWorker for {}", serialized_worker_url);
         let top_level_browsing_context_id = TopLevelBrowsingContextId::installed();
-        let origin = GlobalScope::current()
-            .expect("No current global object")
-            .origin()
-            .immutable()
-            .clone();
+        let current_global = GlobalScope::current().expect("No current global object");
+        let origin = current_global.origin().immutable().clone();
+        let parent = current_global.runtime_handle();
 
         thread::Builder::new()
             .name(name)
@@ -327,7 +325,7 @@ impl DedicatedWorkerGlobalScope {
                 let url = metadata.final_url;
                 let source = String::from_utf8_lossy(&bytes);
 
-                let runtime = unsafe { new_rt_and_cx() };
+                let runtime = unsafe { new_child_runtime(parent) };
 
                 let (devtools_mpsc_chan, devtools_mpsc_port) = unbounded();
                 ROUTER.route_ipc_receiver_to_crossbeam_sender(

components/script/dom/globalscope.rs

@@ -47,7 +47,7 @@ use js::jsapi::{HandleObject, Heap};
 use js::jsapi::{JSAutoCompartment, JSContext};
 use js::panic::maybe_resume_unwind;
 use js::rust::wrappers::Evaluate2;
-use js::rust::{get_object_class, CompileOptionsWrapper, Runtime};
+use js::rust::{get_object_class, CompileOptionsWrapper, ParentRuntime, Runtime};
 use js::rust::{HandleValue, MutableHandleValue};
 use js::{JSCLASS_IS_DOMJSCLASS, JSCLASS_IS_GLOBAL};
 use msg::constellation_msg::PipelineId;
@@ -711,6 +711,16 @@ impl GlobalScope {
         unreachable!();
     }
 
+    pub fn runtime_handle(&self) -> ParentRuntime {
+        if self.is::<Window>() {
+            ScriptThread::runtime_handle()
+        } else if let Some(worker) = self.downcast::<WorkerGlobalScope>() {
+            worker.runtime_handle()
+        } else {
+            unreachable!()
+        }
+    }
+
     /// Returns the ["current"] global object.
     ///
     /// ["current"]: https://html.spec.whatwg.org/multipage/#current

components/script/dom/serviceworkerglobalscope.rs

@@ -292,7 +292,7 @@ impl ServiceWorkerGlobalScope {
                         },
                     };
 
-                let runtime = unsafe { new_rt_and_cx() };
+                let runtime = new_rt_and_cx();
 
                 let (devtools_mpsc_chan, devtools_mpsc_port) = unbounded();
                 ROUTER

components/script/dom/workerglobalscope.rs

@@ -39,7 +39,7 @@ use ipc_channel::ipc::IpcSender;
 use js::jsapi::{JSAutoCompartment, JSContext};
 use js::jsval::UndefinedValue;
 use js::panic::maybe_resume_unwind;
-use js::rust::HandleValue;
+use js::rust::{HandleValue, ParentRuntime};
 use msg::constellation_msg::PipelineId;
 use net_traits::request::{CredentialsMode, Destination, RequestInit as NetRequestInit};
 use net_traits::{load_whole_resource, IpcSend};
@@ -135,6 +135,10 @@ impl WorkerGlobalScope {
         }
     }
 
+    pub fn runtime_handle(&self) -> ParentRuntime {
+        self.runtime.prepare_for_new_child()
+    }
+
     pub fn from_devtools_sender(&self) -> Option<IpcSender<DevtoolScriptControlMsg>> {
         self.from_devtools_sender.clone()
     }

components/script/dom/worklet.rs

@@ -470,7 +470,7 @@ impl WorkletThread {
                 global_init: init.global_init,
                 global_scopes: HashMap::new(),
                 control_buffer: None,
-                runtime: unsafe { new_rt_and_cx() },
+                runtime: new_rt_and_cx(),
                 should_gc: false,
                 gc_threshold: MIN_GC_THRESHOLD,
             });