Bug 1170760 part 2. Pass in the 'this' value to Promise static methods. r=peterv

dom/bindings/BindingUtils.cpp

@@ -2761,8 +2761,17 @@ ConvertExceptionToPromise(JSContext* cx,
   }
 
   JS_ClearPendingException(cx);
+
+  nsCOMPtr<nsIGlobalObject> globalObj =
+    do_QueryInterface(global.GetAsSupports());
+  if (!globalObj) {
+    ErrorResult rv;
+    rv.Throw(NS_ERROR_UNEXPECTED);
+    return !rv.MaybeSetPendingException(cx);
+  }
+
   ErrorResult rv;
-  RefPtr<Promise> promise = Promise::Reject(global, exn, rv);
+  RefPtr<Promise> promise = Promise::Reject(globalObj, cx, exn, rv);
   if (rv.MaybeSetPendingException(cx)) {
     // We just give up.  We put the exception from the ErrorResult on
     // the JSContext just to make sure to not leak memory on the

dom/bindings/Codegen.py

@@ -5085,12 +5085,19 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
                   // Might as well use CurrentGlobalOrNull here; that will at
                   // least give us the same behavior as if the caller just called
                   // Promise.resolve() themselves.
-                  GlobalObject promiseGlobal(cx, JS::CurrentGlobalOrNull(cx));
+                  JS::Rooted<JSObject*> globalObj(cx, JS::CurrentGlobalOrNull(cx));
+                  GlobalObject promiseGlobal(cx, globalObj);
                   if (promiseGlobal.Failed()) {
                     $*{exceptionCode}
                   }
                   ErrorResult promiseRv;
-                  $${declName} = Promise::Resolve(promiseGlobal, $${val}, promiseRv);
+                  JS::Handle<JSObject*> promiseCtor =
+                    PromiseBinding::GetConstructorObjectHandle(cx, globalObj);
+                  if (!promiseCtor) {
+                    $*{exceptionCode}
+                  }
+                  JS::Rooted<JS::Value> resolveThisv(cx, JS::ObjectValue(*promiseCtor));
+                  $${declName} = Promise::Resolve(promiseGlobal, resolveThisv, $${val}, promiseRv);
                   if (promiseRv.MaybeSetPendingException(cx)) {
                     $*{exceptionCode}
                   }
@@ -7054,6 +7061,11 @@ class CGPerSignatureCall(CGThing):
             needsUnwrappedVar = True
             argsPre.append("unwrappedObj ? *unwrappedObj : obj")
 
+        if static and not isConstructor and descriptor.name == "Promise":
+            # Hack for Promise for now: pass in the "this" value to
+            # Promise static methods.
+            argsPre.append("args.thisv()")
+
         if needsUnwrap and needsUnwrappedVar:
             # We cannot assign into obj because it's a Handle, not a
             # MutableHandle, so we need a separate Rooted.

dom/promise/Promise.cpp

@@ -813,7 +813,7 @@ Promise::CallInitFunction(const GlobalObject& aGlobal,
 }
 
 /* static */ already_AddRefed<Promise>
-Promise::Resolve(const GlobalObject& aGlobal,
+Promise::Resolve(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
                  JS::Handle<JS::Value> aValue, ErrorResult& aRv)
 {
   // If a Promise was passed, just return it.
@@ -856,7 +856,7 @@ Promise::Resolve(nsIGlobalObject* aGlobal, JSContext* aCx,
 }
 
 /* static */ already_AddRefed<Promise>
-Promise::Reject(const GlobalObject& aGlobal,
+Promise::Reject(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
                 JS::Handle<JS::Value> aValue, ErrorResult& aRv)
 {
   nsCOMPtr<nsIGlobalObject> global =
@@ -1057,7 +1057,7 @@ NS_INTERFACE_MAP_END
 NS_IMPL_CYCLE_COLLECTION(AllResolveElementFunction, mCountdownHolder)
 
 /* static */ already_AddRefed<Promise>
-Promise::All(const GlobalObject& aGlobal,
+Promise::All(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
              const Sequence<JS::Value>& aIterable, ErrorResult& aRv)
 {
   JSContext* cx = aGlobal.Context();
@@ -1066,7 +1066,7 @@ Promise::All(const GlobalObject& aGlobal,
 
   for (uint32_t i = 0; i < aIterable.Length(); ++i) {
     JS::Rooted<JS::Value> value(cx, aIterable.ElementAt(i));
-    RefPtr<Promise> nextPromise = Promise::Resolve(aGlobal, value, aRv);
+    RefPtr<Promise> nextPromise = Promise::Resolve(aGlobal, aThisv, value, aRv);
 
     MOZ_ASSERT(!aRv.Failed());
 
@@ -1132,7 +1132,7 @@ Promise::All(const GlobalObject& aGlobal,
 }
 
 /* static */ already_AddRefed<Promise>
-Promise::Race(const GlobalObject& aGlobal,
+Promise::Race(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
               const Sequence<JS::Value>& aIterable, ErrorResult& aRv)
 {
   nsCOMPtr<nsIGlobalObject> global =
@@ -1162,7 +1162,7 @@ Promise::Race(const GlobalObject& aGlobal,
 
   for (uint32_t i = 0; i < aIterable.Length(); ++i) {
     JS::Rooted<JS::Value> value(cx, aIterable.ElementAt(i));
-    RefPtr<Promise> nextPromise = Promise::Resolve(aGlobal, value, aRv);
+    RefPtr<Promise> nextPromise = Promise::Resolve(aGlobal, aThisv, value, aRv);
     // According to spec, Resolve can throw, but our implementation never does.
     // Well it does when window isn't passed on the main thread, but that is an
     // implementation detail which should never be reached since we are checking

dom/promise/Promise.h

@@ -164,7 +164,7 @@ public:
               ErrorResult& aRv, JS::Handle<JSObject*> aDesiredProto);
 
   static already_AddRefed<Promise>
-  Resolve(const GlobalObject& aGlobal,
+  Resolve(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
           JS::Handle<JS::Value> aValue, ErrorResult& aRv);
 
   static already_AddRefed<Promise>
@@ -172,7 +172,7 @@ public:
           JS::Handle<JS::Value> aValue, ErrorResult& aRv);
 
   static already_AddRefed<Promise>
-  Reject(const GlobalObject& aGlobal,
+  Reject(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
          JS::Handle<JS::Value> aValue, ErrorResult& aRv);
 
   static already_AddRefed<Promise>
@@ -187,7 +187,7 @@ public:
   Catch(JSContext* aCx, AnyCallback* aRejectCallback, ErrorResult& aRv);
 
   static already_AddRefed<Promise>
-  All(const GlobalObject& aGlobal,
+  All(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
       const Sequence<JS::Value>& aIterable, ErrorResult& aRv);
 
   static already_AddRefed<Promise>
@@ -195,7 +195,7 @@ public:
       const nsTArray<RefPtr<Promise>>& aPromiseList, ErrorResult& aRv);
 
   static already_AddRefed<Promise>
-  Race(const GlobalObject& aGlobal,
+  Race(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
        const Sequence<JS::Value>& aIterable, ErrorResult& aRv);
 
   void AppendNativeHandler(PromiseNativeHandler* aRunnable);