Add an inCompartments config for bindings

components/script/compartments.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 use crate::dom::globalscope::GlobalScope;
-use js::jsapi::{GetCurrentRealmOrNull, JSAutoRealm};
+use js::jsapi::{GetCurrentRealmOrNull, JSAutoRealm, JSContext};
 
 pub struct AlreadyInCompartment(());
 
@@ -15,6 +15,13 @@ impl AlreadyInCompartment {
         }
         AlreadyInCompartment(())
     }
+
+    pub fn assert_for_cx(cx: *mut JSContext) -> AlreadyInCompartment {
+        unsafe {
+            assert!(!GetCurrentRealmOrNull(cx).is_null());
+        }
+        AlreadyInCompartment(())
+    }
 }
 
 #[derive(Clone, Copy)]

components/script/dom/bindings/codegen/Bindings.conf

@@ -40,6 +40,14 @@ DOMInterfaces = {
 'WindowProxy' : {
     'path': 'crate::dom::windowproxy::WindowProxy',
     'register': False,
+},
+
+'Window': {
+    'inCompartments': ['Fetch'],
+},
+
+'WorkerGlobalScope': {
+    'inCompartments': ['Fetch'],
 }
 
 }

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

@@ -3316,6 +3316,8 @@ class CGCallGenerator(CGThing):
 
         if "cx" not in argsPre and needsCx:
             args.prepend(CGGeneric("cx"))
+        if nativeMethodName in descriptor.inCompartmentMethods:
+            args.append(CGGeneric("InCompartment::in_compartment(&AlreadyInCompartment::assert_for_cx(cx))"));
 
         # Build up our actual call
         self.cgRoot = CGList([], "\n")
@@ -5640,7 +5642,7 @@ class CGInterfaceTrait(CGThing):
                     name = CGSpecializedMethod.makeNativeName(descriptor, m)
                     infallible = 'infallible' in descriptor.getExtendedAttributes(m)
                     for idx, (rettype, arguments) in enumerate(m.signatures()):
-                        arguments = method_arguments(descriptor, rettype, arguments)
+                        arguments = method_arguments(descriptor, rettype, arguments, inCompartment=name in descriptor.inCompartmentMethods)
                         rettype = return_type(descriptor, rettype, infallible)
                         yield name + ('_' * idx), arguments, rettype
                 elif m.isAttr() and not m.isStatic():
@@ -5671,7 +5673,7 @@ class CGInterfaceTrait(CGThing):
                     if operation.isGetter():
                         if not rettype.nullable():
                             rettype = IDLNullableType(rettype.location, rettype)
-                        arguments = method_arguments(descriptor, rettype, arguments)
+                        arguments = method_arguments(descriptor, rettype, arguments, inCompartment=name in descriptor.inCompartmentMethods)
 
                         # If this interface 'supports named properties', then we
                         # should be able to access 'supported property names'
@@ -5681,7 +5683,7 @@ class CGInterfaceTrait(CGThing):
                         if operation.isNamed():
                             yield "SupportedPropertyNames", [], "Vec<DOMString>"
                     else:
-                        arguments = method_arguments(descriptor, rettype, arguments)
+                        arguments = method_arguments(descriptor, rettype, arguments, inCompartment=name in descriptor.inCompartmentMethods)
                     rettype = return_type(descriptor, rettype, infallible)
                     yield name, arguments, rettype
 
@@ -5975,6 +5977,8 @@ def generate_imports(config, cgthings, descriptors, callbacks=None, dictionaries
         'crate::dom::windowproxy::WindowProxy',
         'crate::dom::globalscope::GlobalScope',
         'crate::mem::malloc_size_of_including_raw_self',
+        'crate::compartments::InCompartment',
+        'crate::compartments::AlreadyInCompartment',
         'libc',
         'servo_config::pref',
         'servo_config::prefs',
@@ -6676,7 +6680,7 @@ def argument_type(descriptorProvider, ty, optional=False, defaultValue=None, var
     return declType.define()
 
 
-def method_arguments(descriptorProvider, returnType, arguments, passJSBits=True, trailing=None):
+def method_arguments(descriptorProvider, returnType, arguments, passJSBits=True, trailing=None, inCompartment=False):
     if needCx(returnType, arguments, passJSBits):
         yield "cx", "*mut JSContext"
 
@@ -6688,6 +6692,9 @@ def method_arguments(descriptorProvider, returnType, arguments, passJSBits=True,
     if trailing:
         yield trailing
 
+    if inCompartment:
+        yield "_comp", "InCompartment"
+
 
 def return_type(descriptorProvider, rettype, infallible):
     result = getRetvalDeclarationForType(rettype, descriptorProvider)

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

@@ -223,6 +223,7 @@ class Descriptor(DescriptorProvider):
         self.concreteType = typeName
         self.register = desc.get('register', True)
         self.path = desc.get('path', pathDefault)
+        self.inCompartmentMethods = [name for name in desc.get('inCompartments', [])]
         self.bindingPath = 'crate::dom::bindings::codegen::Bindings::%s' % ('::'.join([ifaceName + 'Binding'] * 2))
         self.outerObjectHook = desc.get('outerObjectHook', 'None')
         self.proxy = False

components/script/dom/window.rs

@@ -2,6 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+use crate::compartments::InCompartment;
 use crate::dom::bindings::cell::DomRefCell;
 use crate::dom::bindings::codegen::Bindings::DocumentBinding::{
     DocumentMethods, DocumentReadyState,
@@ -1144,8 +1145,9 @@ impl WindowMethods for Window {
         &self,
         input: RequestOrUSVString,
         init: RootedTraceableBox<RequestInit>,
+        comp: InCompartment,
     ) -> Rc<Promise> {
-        fetch::Fetch(&self.upcast(), input, init)
+        fetch::Fetch(&self.upcast(), input, init, comp)
     }
 
     fn TestRunner(&self) -> DomRoot<TestRunner> {

components/script/dom/workerglobalscope.rs

@@ -2,6 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+use crate::compartments::InCompartment;
 use crate::dom::bindings::cell::DomRefCell;
 use crate::dom::bindings::codegen::Bindings::FunctionBinding::Function;
 use crate::dom::bindings::codegen::Bindings::RequestBinding::RequestInit;
@@ -368,8 +369,9 @@ impl WorkerGlobalScopeMethods for WorkerGlobalScope {
         &self,
         input: RequestOrUSVString,
         init: RootedTraceableBox<RequestInit>,
+        comp: InCompartment,
     ) -> Rc<Promise> {
-        fetch::Fetch(self.upcast(), input, init)
+        fetch::Fetch(self.upcast(), input, init, comp)
     }
 
     // https://w3c.github.io/hr-time/#the-performance-attribute

components/script/fetch.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::compartments::{AlreadyInCompartment, InCompartment};
+use crate::compartments::InCompartment;
 use crate::dom::bindings::codegen::Bindings::RequestBinding::RequestInfo;
 use crate::dom::bindings::codegen::Bindings::RequestBinding::RequestInit;
 use crate::dom::bindings::codegen::Bindings::ResponseBinding::ResponseBinding::ResponseMethods;
@@ -134,12 +134,12 @@ pub fn Fetch(
     global: &GlobalScope,
     input: RequestInfo,
     init: RootedTraceableBox<RequestInit>,
+    comp: InCompartment,
 ) -> Rc<Promise> {
     let core_resource_thread = global.core_resource_thread();
 
     // Step 1
-    let aic = AlreadyInCompartment::assert(global);
+    let promise = Promise::new_in_current_compartment(global, comp);
-    let promise = Promise::new_in_current_compartment(global, InCompartment::Already(&aic));
     let response = Response::new(global);
 
     // Step 2