Replace NonZero<*mut JSObject> with a wrapper to enable local trait impls.

Cargo.lock

@@ -2618,6 +2618,7 @@ dependencies = [
  "mitochondria 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "net_traits 0.0.1",
+ "nonzero 0.0.1",
  "num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "offscreen_gl_context 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "open 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",

components/script/Cargo.toml

@@ -61,6 +61,7 @@ mime = "0.2.1"
 mime_guess = "1.8.0"
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
+nonzero = {path = "../nonzero"}
 num-traits = "0.1.32"
 offscreen_gl_context = { version = "0.11", features = ["serde"] }
 open = "1.1.1"

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

@@ -1407,7 +1407,7 @@ def getRetvalDeclarationForType(returnType, descriptorProvider):
     if returnType.isAny():
         return CGGeneric("JSVal")
     if returnType.isObject() or returnType.isSpiderMonkeyInterface():
-        result = CGGeneric("NonZero<*mut JSObject>")
+        result = CGGeneric("NonNullJSObjectPtr")
         if returnType.nullable():
             result = CGWrapper(result, pre="Option<", post=">")
         return result
@@ -2253,6 +2253,7 @@ def UnionTypes(descriptors, dictionaries, callbacks, typedefs, config):
         'dom::bindings::conversions::StringificationBehavior',
         'dom::bindings::conversions::root_from_handlevalue',
         'dom::bindings::error::throw_not_in_union',
+        'dom::bindings::nonnull::NonNullJSObjectPtr',
         'dom::bindings::mozmap::MozMap',
         'dom::bindings::root::DomRoot',
         'dom::bindings::str::ByteString',
@@ -5785,6 +5786,7 @@ def generate_imports(config, cgthings, descriptors, callbacks=None, dictionaries
         'dom::bindings::proxyhandler::get_expando_object',
         'dom::bindings::proxyhandler::get_property_descriptor',
         'dom::bindings::mozmap::MozMap',
+        'dom::bindings::nonnull::NonNullJSObjectPtr',
         'dom::bindings::num::Finite',
         'dom::bindings::str::ByteString',
         'dom::bindings::str::DOMString',

components/script/dom/bindings/conversions.rs

@@ -34,6 +34,7 @@
 
 use dom::bindings::error::{Error, Fallible};
 use dom::bindings::inheritance::Castable;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::num::Finite;
 use dom::bindings::reflector::{DomObject, Reflector};
 use dom::bindings::root::DomRoot;
@@ -53,7 +54,7 @@ use js::jsapi::{JS_GetLatin1StringCharsAndLength, JS_GetProperty, JS_GetReserved
 use js::jsapi::{JS_GetTwoByteStringCharsAndLength, JS_IsArrayObject, JS_IsExceptionPending};
 use js::jsapi::{JS_NewStringCopyN, JS_StringHasLatin1Chars, MutableHandleValue};
 use js::jsval::{ObjectValue, StringValue, UndefinedValue};
-use js::rust::{ToString, get_object_class, is_dom_class, is_dom_object, maybe_wrap_value};
+use js::rust::{ToString, get_object_class, is_dom_class, is_dom_object, maybe_wrap_value, maybe_wrap_object_value};
 use libc;
 use num_traits::Float;
 use servo_config::opts;
@@ -69,6 +70,15 @@ pub trait IDLInterface {
 #[rustc_on_unimplemented = "The IDL interface `{Self}` is not derived from `{T}`."]
 pub trait DerivedFrom<T: Castable>: Castable {}
 
+// https://heycam.github.io/webidl/#es-object
+impl ToJSValConvertible for NonNullJSObjectPtr {
+    #[inline]
+    unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
+        rval.set(ObjectValue(self.get()));
+        maybe_wrap_object_value(cx, rval);
+    }
+}
+
 impl<T: Float + ToJSValConvertible> ToJSValConvertible for Finite<T> {
     #[inline]
     unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {

components/script/dom/bindings/iterable.rs

@@ -6,17 +6,17 @@
 
 //! Implementation of `iterable<...>` and `iterable<..., ...>` WebIDL declarations.
 
-use core::nonzero::NonZero;
 use dom::bindings::codegen::Bindings::IterableIteratorBinding::IterableKeyAndValueResult;
 use dom::bindings::codegen::Bindings::IterableIteratorBinding::IterableKeyOrValueResult;
 use dom::bindings::error::Fallible;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::root::{Dom, DomRoot};
 use dom::bindings::trace::JSTraceable;
 use dom::globalscope::GlobalScope;
 use dom_struct::dom_struct;
 use js::conversions::ToJSValConvertible;
-use js::jsapi::{HandleValue, Heap, JSContext, JSObject, MutableHandleObject};
+use js::jsapi::{HandleValue, Heap, JSContext, MutableHandleObject};
 use js::jsval::UndefinedValue;
 use std::cell::Cell;
 use std::ptr;
@@ -73,7 +73,7 @@ impl<T: DomObject + JSTraceable + Iterable> IterableIterator<T> {
 
     /// Return the next value from the iterable object.
     #[allow(non_snake_case)]
-    pub fn Next(&self, cx: *mut JSContext) -> Fallible<NonZero<*mut JSObject>> {
+    pub fn Next(&self, cx: *mut JSContext) -> Fallible<NonNullJSObjectPtr> {
         let index = self.index.get();
         rooted!(in(cx) let mut value = UndefinedValue());
         rooted!(in(cx) let mut rval = ptr::null_mut());
@@ -106,7 +106,7 @@ impl<T: DomObject + JSTraceable + Iterable> IterableIterator<T> {
         self.index.set(index + 1);
         result.map(|_| {
             assert!(!rval.is_null());
-            unsafe { NonZero::new_unchecked(rval.get()) }
+            unsafe { NonNullJSObjectPtr::new_unchecked(rval.get()) }
         })
     }
 }

components/script/dom/bindings/mod.rs

@@ -144,6 +144,7 @@ pub mod interface;
 pub mod iterable;
 pub mod mozmap;
 pub mod namespace;
+pub mod nonnull;
 pub mod num;
 pub mod proxyhandler;
 pub mod refcounted;

components/script/dom/bindings/nonnull.rs

@@ -0,0 +1,24 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! A wrapper type for `NonZero<*mut JSObject>`, to enable local trait impls
+
+use js::jsapi::JSObject;
+use nonzero::NonZero;
+
+/// A wrapper type for `NonZero<*mut JSObject>`, to enable local trait impls
+#[derive(Clone, Copy)]
+pub struct NonNullJSObjectPtr(NonZero<*mut JSObject>);
+
+impl NonNullJSObjectPtr {
+    #[inline]
+    pub unsafe fn new_unchecked(ptr: *mut JSObject) -> Self {
+        NonNullJSObjectPtr(NonZero::new_unchecked(ptr))
+    }
+
+    #[inline]
+    pub fn get(self) -> *mut JSObject {
+        self.0.get()
+    }
+}

components/script/dom/crypto.rs

@@ -2,11 +2,11 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
 use dom::bindings::cell::DomRefCell;
 use dom::bindings::codegen::Bindings::CryptoBinding;
 use dom::bindings::codegen::Bindings::CryptoBinding::CryptoMethods;
 use dom::bindings::error::{Error, Fallible};
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::reflector::{Reflector, reflect_dom_object};
 use dom::bindings::root::DomRoot;
 use dom::globalscope::GlobalScope;
@@ -44,7 +44,7 @@ impl CryptoMethods for Crypto {
     unsafe fn GetRandomValues(&self,
                        _cx: *mut JSContext,
                        input: *mut JSObject)
-                       -> Fallible<NonZero<*mut JSObject>> {
+                       -> Fallible<NonNullJSObjectPtr> {
         assert!(!input.is_null());
         typedarray!(in(_cx) let mut array_buffer_view: ArrayBufferView = input);
         let (array_type, mut data) = match array_buffer_view.as_mut() {
@@ -65,7 +65,7 @@ impl CryptoMethods for Crypto {
 
         self.rng.borrow_mut().fill_bytes(&mut data);
 
-        Ok(NonZero::new_unchecked(input))
+        Ok(NonNullJSObjectPtr::new_unchecked(input))
     }
 }
 

components/script/dom/document.rs

@@ -3,7 +3,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use cookie_rs;
-use core::nonzero::NonZero;
 use devtools_traits::ScriptToDevtoolsControlMsg;
 use document_loader::{DocumentLoader, LoadType};
 use dom::activation::{ActivationSource, synthetic_click_activation};
@@ -24,6 +23,7 @@ use dom::bindings::codegen::Bindings::WindowBinding::{FrameRequestCallback, Scro
 use dom::bindings::codegen::UnionTypes::NodeOrString;
 use dom::bindings::error::{Error, ErrorResult, Fallible};
 use dom::bindings::inheritance::{Castable, ElementTypeId, HTMLElementTypeId, NodeTypeId};
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::num::Finite;
 use dom::bindings::refcounted::{Trusted, TrustedPromise};
 use dom::bindings::reflector::{DomObject, reflect_dom_object};
@@ -99,7 +99,7 @@ use html5ever::{LocalName, Namespace, QualName};
 use hyper::header::{Header, SetCookie};
 use hyper_serde::Serde;
 use ipc_channel::ipc::{self, IpcSender};
-use js::jsapi::{JSContext, JSObject, JSRuntime};
+use js::jsapi::{JSContext, JSRuntime};
 use js::jsapi::JS_GetRuntime;
 use msg::constellation_msg::{ALT, CONTROL, SHIFT, SUPER};
 use msg::constellation_msg::{BrowsingContextId, Key, KeyModifiers, KeyState, TopLevelBrowsingContextId};
@@ -3536,7 +3536,7 @@ impl DocumentMethods for Document {
 
     #[allow(unsafe_code)]
     // https://html.spec.whatwg.org/multipage/#dom-tree-accessors:dom-document-nameditem-filter
-    unsafe fn NamedGetter(&self, _cx: *mut JSContext, name: DOMString) -> Option<NonZero<*mut JSObject>> {
+    unsafe fn NamedGetter(&self, _cx: *mut JSContext, name: DOMString) -> Option<NonNullJSObjectPtr> {
         #[derive(HeapSizeOf, JSTraceable)]
         struct NamedElementFilter {
             name: Atom,
@@ -3604,7 +3604,7 @@ impl DocumentMethods for Document {
                 if elements.peek().is_none() {
                     // TODO: Step 2.
                     // Step 3.
-                    return Some(NonZero::new_unchecked(first.reflector().get_jsobject().get()));
+                    return Some(NonNullJSObjectPtr::new_unchecked(first.reflector().get_jsobject().get()));
                 }
             } else {
                 return None;
@@ -3615,7 +3615,7 @@ impl DocumentMethods for Document {
             name: name,
         };
         let collection = HTMLCollection::create(self.window(), root, Box::new(filter));
-        Some(NonZero::new_unchecked(collection.reflector().get_jsobject().get()))
+        Some(NonNullJSObjectPtr::new_unchecked(collection.reflector().get_jsobject().get()))
     }
 
     // https://html.spec.whatwg.org/multipage/#dom-tree-accessors:supported-property-names

components/script/dom/gamepad.rs

@@ -2,10 +2,10 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
 use dom::bindings::codegen::Bindings::GamepadBinding;
 use dom::bindings::codegen::Bindings::GamepadBinding::GamepadMethods;
 use dom::bindings::inheritance::Castable;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::num::Finite;
 use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::root::{Dom, DomRoot};
@@ -131,8 +131,8 @@ impl GamepadMethods for Gamepad {
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/gamepad/#dom-gamepad-axes
-    unsafe fn Axes(&self, _cx: *mut JSContext) -> NonZero<*mut JSObject> {
-        NonZero::new_unchecked(self.axes.get())
+    unsafe fn Axes(&self, _cx: *mut JSContext) -> NonNullJSObjectPtr {
+        NonNullJSObjectPtr::new_unchecked(self.axes.get())
     }
 
     // https://w3c.github.io/gamepad/#dom-gamepad-buttons

components/script/dom/imagedata.rs

@@ -2,10 +2,10 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
 use dom::bindings::codegen::Bindings::ImageDataBinding;
 use dom::bindings::codegen::Bindings::ImageDataBinding::ImageDataMethods;
 use dom::bindings::error::{Fallible, Error};
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::reflector::{Reflector, reflect_dom_object};
 use dom::bindings::root::DomRoot;
 use dom::globalscope::GlobalScope;
@@ -159,8 +159,8 @@ impl ImageDataMethods for ImageData {
 
     #[allow(unsafe_code)]
     // https://html.spec.whatwg.org/multipage/#dom-imagedata-data
-    unsafe fn Data(&self, _: *mut JSContext) -> NonZero<*mut JSObject> {
+    unsafe fn Data(&self, _: *mut JSContext) -> NonNullJSObjectPtr {
         assert!(!self.data.get().is_null());
-        NonZero::new_unchecked(self.data.get())
+        NonNullJSObjectPtr::new_unchecked(self.data.get())
     }
 }

components/script/dom/testbinding.rs

@@ -4,7 +4,6 @@
 
 // check-tidy: no specs after this line
 
-use core::nonzero::NonZero;
 use dom::bindings::callback::ExceptionHandling;
 use dom::bindings::codegen::Bindings::EventListenerBinding::EventListener;
 use dom::bindings::codegen::Bindings::FunctionBinding::Function;
@@ -22,6 +21,7 @@ use dom::bindings::codegen::UnionTypes::{StringOrLongSequence, StringOrStringSeq
 use dom::bindings::codegen::UnionTypes::{StringOrUnsignedLong, StringOrBoolean, UnsignedLongOrBoolean};
 use dom::bindings::error::{Error, Fallible};
 use dom::bindings::mozmap::MozMap;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::num::Finite;
 use dom::bindings::refcounted::TrustedPromise;
 use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
@@ -151,20 +151,20 @@ impl TestBindingMethods for TestBinding {
     }
     fn SetUnion9Attribute(&self, _: ByteStringOrLong) {}
     #[allow(unsafe_code)]
-    unsafe fn ArrayAttribute(&self, cx: *mut JSContext) -> NonZero<*mut JSObject> {
+    unsafe fn ArrayAttribute(&self, cx: *mut JSContext) -> NonNullJSObjectPtr {
         rooted!(in(cx) let array = JS_NewUint8ClampedArray(cx, 16));
         assert!(!array.is_null());
-        NonZero::new_unchecked(array.get())
+        NonNullJSObjectPtr::new_unchecked(array.get())
     }
     #[allow(unsafe_code)]
     unsafe fn AnyAttribute(&self, _: *mut JSContext) -> JSVal { NullValue() }
     #[allow(unsafe_code)]
     unsafe fn SetAnyAttribute(&self, _: *mut JSContext, _: HandleValue) {}
     #[allow(unsafe_code)]
-    unsafe fn ObjectAttribute(&self, cx: *mut JSContext) -> NonZero<*mut JSObject> {
+    unsafe fn ObjectAttribute(&self, cx: *mut JSContext) -> NonNullJSObjectPtr {
         rooted!(in(cx) let obj = JS_NewPlainObject(cx));
         assert!(!obj.is_null());
-        NonZero::new_unchecked(obj.get())
+        NonNullJSObjectPtr::new_unchecked(obj.get())
     }
     #[allow(unsafe_code)]
     unsafe fn SetObjectAttribute(&self, _: *mut JSContext, _: *mut JSObject) {}
@@ -220,7 +220,7 @@ impl TestBindingMethods for TestBinding {
         self.url.set(url);
     }
     #[allow(unsafe_code)]
-    unsafe fn GetObjectAttributeNullable(&self, _: *mut JSContext) -> Option<NonZero<*mut JSObject>> { None }
+    unsafe fn GetObjectAttributeNullable(&self, _: *mut JSContext) -> Option<NonNullJSObjectPtr> { None }
     #[allow(unsafe_code)]
     unsafe fn SetObjectAttributeNullable(&self, _: *mut JSContext, _: *mut JSObject) {}
     fn GetUnionAttributeNullable(&self) -> Option<HTMLElementOrLong> {
@@ -272,7 +272,7 @@ impl TestBindingMethods for TestBinding {
     #[allow(unsafe_code)]
     unsafe fn ReceiveAny(&self, _: *mut JSContext) -> JSVal { NullValue() }
     #[allow(unsafe_code)]
-    unsafe fn ReceiveObject(&self, cx: *mut JSContext) -> NonZero<*mut JSObject> {
+    unsafe fn ReceiveObject(&self, cx: *mut JSContext) -> NonNullJSObjectPtr {
         self.ObjectAttribute(cx)
     }
     fn ReceiveUnion(&self) -> HTMLElementOrLong { HTMLElementOrLong::Long(0) }
@@ -316,7 +316,7 @@ impl TestBindingMethods for TestBinding {
         Some(Blob::new(&self.global(), BlobImpl::new_from_bytes(vec![]), "".to_owned()))
     }
     #[allow(unsafe_code)]
-    unsafe fn ReceiveNullableObject(&self, cx: *mut JSContext) -> Option<NonZero<*mut JSObject>> {
+    unsafe fn ReceiveNullableObject(&self, cx: *mut JSContext) -> Option<NonNullJSObjectPtr> {
         self.GetObjectAttributeNullable(cx)
     }
     fn ReceiveNullableUnion(&self) -> Option<HTMLElementOrLong> {

components/script/dom/textencoder.rs

@@ -2,16 +2,16 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
 use dom::bindings::codegen::Bindings::TextEncoderBinding;
 use dom::bindings::codegen::Bindings::TextEncoderBinding::TextEncoderMethods;
 use dom::bindings::error::Fallible;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::reflector::{Reflector, reflect_dom_object};
 use dom::bindings::root::DomRoot;
 use dom::bindings::str::{DOMString, USVString};
 use dom::globalscope::GlobalScope;
 use dom_struct::dom_struct;
-use js::jsapi::{JSContext, JSObject};
+use js::jsapi::JSContext;
 use js::typedarray::{Uint8Array, CreateWith};
 use std::ptr;
 
@@ -47,12 +47,12 @@ impl TextEncoderMethods for TextEncoder {
 
     #[allow(unsafe_code)]
     // https://encoding.spec.whatwg.org/#dom-textencoder-encode
-    unsafe fn Encode(&self, cx: *mut JSContext, input: USVString) -> NonZero<*mut JSObject> {
+    unsafe fn Encode(&self, cx: *mut JSContext, input: USVString) -> NonNullJSObjectPtr {
         let encoded = input.0.as_bytes();
 
         rooted!(in(cx) let mut js_object = ptr::null_mut());
         assert!(Uint8Array::create(cx, CreateWith::Slice(&encoded), js_object.handle_mut()).is_ok());
 
-        NonZero::new_unchecked(js_object.get())
+        NonNullJSObjectPtr::new_unchecked(js_object.get())
     }
 }

components/script/dom/vreyeparameters.rs

@@ -2,10 +2,10 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
 use dom::bindings::cell::DomRefCell;
 use dom::bindings::codegen::Bindings::VREyeParametersBinding;
 use dom::bindings::codegen::Bindings::VREyeParametersBinding::VREyeParametersMethods;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::reflector::{Reflector, reflect_dom_object};
 use dom::bindings::root::{Dom, DomRoot};
 use dom::globalscope::GlobalScope;
@@ -60,8 +60,8 @@ impl VREyeParameters {
 impl VREyeParametersMethods for VREyeParameters {
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vreyeparameters-offset
-    unsafe fn Offset(&self, _cx: *mut JSContext) -> NonZero<*mut JSObject> {
-        NonZero::new_unchecked(self.offset.get())
+    unsafe fn Offset(&self, _cx: *mut JSContext) -> NonNullJSObjectPtr {
+        NonNullJSObjectPtr::new_unchecked(self.offset.get())
     }
 
     // https://w3c.github.io/webvr/#dom-vreyeparameters-fieldofview

components/script/dom/vrframedata.rs

@@ -2,10 +2,10 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
 use dom::bindings::codegen::Bindings::VRFrameDataBinding;
 use dom::bindings::codegen::Bindings::VRFrameDataBinding::VRFrameDataMethods;
 use dom::bindings::error::Fallible;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::num::Finite;
 use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::root::{Dom, DomRoot};
@@ -118,26 +118,26 @@ impl VRFrameDataMethods for VRFrameData {
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrframedata-leftprojectionmatrix
-    unsafe fn LeftProjectionMatrix(&self, _cx: *mut JSContext) -> NonZero<*mut JSObject> {
-        NonZero::new_unchecked(self.left_proj.get())
+    unsafe fn LeftProjectionMatrix(&self, _cx: *mut JSContext) -> NonNullJSObjectPtr {
+        NonNullJSObjectPtr::new_unchecked(self.left_proj.get())
     }
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrframedata-leftviewmatrix
-    unsafe fn LeftViewMatrix(&self, _cx: *mut JSContext) -> NonZero<*mut JSObject> {
-        NonZero::new_unchecked(self.left_view.get())
+    unsafe fn LeftViewMatrix(&self, _cx: *mut JSContext) -> NonNullJSObjectPtr {
+        NonNullJSObjectPtr::new_unchecked(self.left_view.get())
     }
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrframedata-rightprojectionmatrix
-    unsafe fn RightProjectionMatrix(&self, _cx: *mut JSContext) -> NonZero<*mut JSObject> {
-        NonZero::new_unchecked(self.right_proj.get())
+    unsafe fn RightProjectionMatrix(&self, _cx: *mut JSContext) -> NonNullJSObjectPtr {
+        NonNullJSObjectPtr::new_unchecked(self.right_proj.get())
     }
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrframedata-rightviewmatrix
-    unsafe fn RightViewMatrix(&self, _cx: *mut JSContext) -> NonZero<*mut JSObject> {
-        NonZero::new_unchecked(self.right_view.get())
+    unsafe fn RightViewMatrix(&self, _cx: *mut JSContext) -> NonNullJSObjectPtr {
+        NonNullJSObjectPtr::new_unchecked(self.right_view.get())
     }
 
     // https://w3c.github.io/webvr/#dom-vrframedata-pose

components/script/dom/vrpose.rs

@@ -2,9 +2,9 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
 use dom::bindings::codegen::Bindings::VRPoseBinding;
 use dom::bindings::codegen::Bindings::VRPoseBinding::VRPoseMethods;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::root::DomRoot;
 use dom::globalscope::GlobalScope;
@@ -52,13 +52,13 @@ unsafe fn update_or_create_typed_array(cx: *mut JSContext,
 
 #[inline]
 #[allow(unsafe_code)]
-fn heap_to_option(heap: &Heap<*mut JSObject>) -> Option<NonZero<*mut JSObject>> {
+fn heap_to_option(heap: &Heap<*mut JSObject>) -> Option<NonNullJSObjectPtr> {
     let js_object = heap.get();
     if js_object.is_null() {
         None
     } else {
         unsafe {
-            Some(NonZero::new_unchecked(js_object))
+            Some(NonNullJSObjectPtr::new_unchecked(js_object))
         }
     }
 }
@@ -101,37 +101,37 @@ impl VRPose {
 impl VRPoseMethods for VRPose {
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrpose-position
-    unsafe fn GetPosition(&self, _cx: *mut JSContext) -> Option<NonZero<*mut JSObject>> {
+    unsafe fn GetPosition(&self, _cx: *mut JSContext) -> Option<NonNullJSObjectPtr> {
         heap_to_option(&self.position)
     }
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrpose-linearvelocity
-    unsafe fn GetLinearVelocity(&self, _cx: *mut JSContext) -> Option<NonZero<*mut JSObject>> {
+    unsafe fn GetLinearVelocity(&self, _cx: *mut JSContext) -> Option<NonNullJSObjectPtr> {
         heap_to_option(&self.linear_vel)
     }
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrpose-linearacceleration
-    unsafe fn GetLinearAcceleration(&self, _cx: *mut JSContext) -> Option<NonZero<*mut JSObject>> {
+    unsafe fn GetLinearAcceleration(&self, _cx: *mut JSContext) -> Option<NonNullJSObjectPtr> {
         heap_to_option(&self.linear_acc)
     }
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrpose-orientation
-    unsafe fn GetOrientation(&self, _cx: *mut JSContext) -> Option<NonZero<*mut JSObject>> {
+    unsafe fn GetOrientation(&self, _cx: *mut JSContext) -> Option<NonNullJSObjectPtr> {
         heap_to_option(&self.orientation)
     }
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrpose-angularvelocity
-    unsafe fn GetAngularVelocity(&self, _cx: *mut JSContext) -> Option<NonZero<*mut JSObject>> {
+    unsafe fn GetAngularVelocity(&self, _cx: *mut JSContext) -> Option<NonNullJSObjectPtr> {
         heap_to_option(&self.angular_vel)
     }
 
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrpose-angularacceleration
-    unsafe fn GetAngularAcceleration(&self, _cx: *mut JSContext) -> Option<NonZero<*mut JSObject>> {
+    unsafe fn GetAngularAcceleration(&self, _cx: *mut JSContext) -> Option<NonNullJSObjectPtr> {
         heap_to_option(&self.angular_acc)
     }
 }

components/script/dom/vrstageparameters.rs

@@ -2,10 +2,10 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
 use dom::bindings::cell::DomRefCell;
 use dom::bindings::codegen::Bindings::VRStageParametersBinding;
 use dom::bindings::codegen::Bindings::VRStageParametersBinding::VRStageParametersMethods;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::num::Finite;
 use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::root::DomRoot;
@@ -69,8 +69,8 @@ impl VRStageParameters {
 impl VRStageParametersMethods for VRStageParameters {
     #[allow(unsafe_code)]
     // https://w3c.github.io/webvr/#dom-vrstageparameters-sittingtostandingtransform
-    unsafe fn SittingToStandingTransform(&self, _cx: *mut JSContext) -> NonZero<*mut JSObject> {
-        NonZero::new_unchecked(self.transform.get())
+    unsafe fn SittingToStandingTransform(&self, _cx: *mut JSContext) -> NonNullJSObjectPtr {
+        NonNullJSObjectPtr::new_unchecked(self.transform.get())
     }
 
     // https://w3c.github.io/webvr/#dom-vrstageparameters-sizex

components/script/dom/webgl_extensions/extensions.rs

@@ -4,18 +4,18 @@
 
 use canvas_traits::webgl::WebGLError;
 use core::iter::FromIterator;
-use core::nonzero::NonZero;
 use dom::bindings::cell::DomRefCell;
 use dom::bindings::codegen::Bindings::OESStandardDerivativesBinding::OESStandardDerivativesConstants;
 use dom::bindings::codegen::Bindings::OESTextureHalfFloatBinding::OESTextureHalfFloatConstants;
 use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::root::DomRoot;
 use dom::bindings::trace::JSTraceable;
 use dom::webglrenderingcontext::WebGLRenderingContext;
 use fnv::{FnvHashMap, FnvHashSet};
 use gleam::gl::GLenum;
 use heapsize::HeapSizeOf;
-use js::jsapi::{JSContext, JSObject};
+use js::jsapi::JSContext;
 use js::jsval::JSVal;
 use ref_filter_map::ref_filter_map;
 use std::cell::Ref;
@@ -109,7 +109,7 @@ impl WebGLExtensions {
                                 .collect()
     }
 
-    pub fn get_or_init_extension(&self, name: &str, ctx: &WebGLRenderingContext) -> Option<NonZero<*mut JSObject>> {
+    pub fn get_or_init_extension(&self, name: &str, ctx: &WebGLRenderingContext) -> Option<NonNullJSObjectPtr> {
         let name = name.to_uppercase();
         self.extensions.borrow().get(&name).and_then(|extension| {
             if extension.is_supported(self) {

components/script/dom/webgl_extensions/wrapper.rs

@@ -2,13 +2,12 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::reflector::DomObject;
 use dom::bindings::root::{DomRoot, MutNullableDom};
 use dom::bindings::trace::JSTraceable;
 use dom::webglrenderingcontext::WebGLRenderingContext;
 use heapsize::HeapSizeOf;
-use js::jsapi::JSObject;
 use std::any::Any;
 use super::{WebGLExtension, WebGLExtensions};
 
@@ -18,7 +17,7 @@ pub trait WebGLExtensionWrapper: JSTraceable + HeapSizeOf {
     fn instance_or_init(&self,
                         ctx: &WebGLRenderingContext,
                         ext: &WebGLExtensions)
-                        -> NonZero<*mut JSObject>;
+                        -> NonNullJSObjectPtr;
     fn is_supported(&self, &WebGLExtensions) -> bool;
     fn is_enabled(&self) -> bool;
     fn enable(&self, ext: &WebGLExtensions);
@@ -48,7 +47,7 @@ impl<T> WebGLExtensionWrapper for TypedWebGLExtensionWrapper<T>
     fn instance_or_init(&self,
                         ctx: &WebGLRenderingContext,
                         ext: &WebGLExtensions)
-                        -> NonZero<*mut JSObject> {
+                        -> NonNullJSObjectPtr {
         let mut enabled = true;
         let extension = self.extension.or_init(|| {
             enabled = false;
@@ -58,7 +57,7 @@ impl<T> WebGLExtensionWrapper for TypedWebGLExtensionWrapper<T>
             self.enable(ext);
         }
         unsafe {
-            NonZero::new_unchecked(extension.reflector().get_jsobject().get())
+            NonNullJSObjectPtr::new_unchecked(extension.reflector().get_jsobject().get())
         }
     }
 

components/script/dom/webglrenderingcontext.rs

@@ -10,7 +10,6 @@ use canvas_traits::webgl::WebGLError::*;
 use canvas_traits::webgl::webgl_channel;
 use core::cell::Ref;
 use core::iter::FromIterator;
-use core::nonzero::NonZero;
 use dom::bindings::cell::DomRefCell;
 use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::{self, WebGLContextAttributes};
 use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
@@ -19,6 +18,7 @@ use dom::bindings::codegen::UnionTypes::ImageDataOrHTMLImageElementOrHTMLCanvasE
 use dom::bindings::conversions::{ConversionResult, FromJSValConvertible, ToJSValConvertible};
 use dom::bindings::error::{Error, Fallible};
 use dom::bindings::inheritance::Castable;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::root::{Dom, DomRoot, LayoutDom, MutNullableDom};
 use dom::bindings::str::DOMString;
@@ -1377,7 +1377,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
     #[allow(unsafe_code)]
     // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.14
     unsafe fn GetExtension(&self, _cx: *mut JSContext, name: DOMString)
-                    -> Option<NonZero<*mut JSObject>> {
+                    -> Option<NonNullJSObjectPtr> {
         self.extension_manager.init_once(|| {
             self.get_gl_extensions()
         });

components/script/dom/xmldocument.rs

@@ -2,11 +2,11 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use core::nonzero::NonZero;
 use document_loader::DocumentLoader;
 use dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods;
 use dom::bindings::codegen::Bindings::XMLDocumentBinding::{self, XMLDocumentMethods};
 use dom::bindings::inheritance::Castable;
+use dom::bindings::nonnull::NonNullJSObjectPtr;
 use dom::bindings::reflector::reflect_dom_object;
 use dom::bindings::root::DomRoot;
 use dom::bindings::str::DOMString;
@@ -15,7 +15,7 @@ use dom::location::Location;
 use dom::node::Node;
 use dom::window::Window;
 use dom_struct::dom_struct;
-use js::jsapi::{JSContext, JSObject};
+use js::jsapi::JSContext;
 use script_traits::DocumentActivity;
 use servo_url::{MutableOrigin, ServoUrl};
 
@@ -100,7 +100,7 @@ impl XMLDocumentMethods for XMLDocument {
 
     #[allow(unsafe_code)]
     // https://html.spec.whatwg.org/multipage/#dom-tree-accessors:dom-document-nameditem-filter
-    unsafe fn NamedGetter(&self, _cx: *mut JSContext, name: DOMString) -> Option<NonZero<*mut JSObject>> {
+    unsafe fn NamedGetter(&self, _cx: *mut JSContext, name: DOMString) -> Option<NonNullJSObjectPtr> {
         self.upcast::<Document>().NamedGetter(_cx, name)
     }
 }

components/script/lib.rs

@@ -67,6 +67,7 @@ extern crate mime_guess;
 extern crate mitochondria;
 extern crate msg;
 extern crate net_traits;
+extern crate nonzero;
 extern crate num_traits;
 extern crate offscreen_gl_context;
 extern crate open;