Bug 1483036 - Add MaybeResolveWithClone and MaybeRejectWithClone to Promise. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D24385

--HG--
extra : moz-landing-system : lando

dom/promise/Promise.cpp

@@ -41,6 +41,7 @@
 #include "PromiseWorkerProxy.h"
 #include "WrapperFactory.h"
 #include "xpcpublic.h"
+#include "xpcprivate.h"
 
 namespace mozilla {
 namespace dom {
@@ -548,6 +549,32 @@ void Promise::ReportRejectedPromise(JSContext* aCx, JS::HandleObject aPromise) {
   }
 }
 
+void Promise::MaybeResolveWithClone(JSContext* aCx,
+                                    JS::Handle<JS::Value> aValue) {
+  JS::Rooted<JSObject*> sourceScope(aCx, JS::CurrentGlobalOrNull(aCx));
+  AutoEntryScript aes(GetParentObject(), "Promise resolution");
+  JSContext* cx = aes.cx();
+  JS::Rooted<JS::Value> value(cx, aValue);
+
+  xpc::StackScopedCloneOptions options;
+  options.wrapReflectors = true;
+  StackScopedClone(cx, options, sourceScope, &value);
+  MaybeResolve(aCx, value);
+}
+
+void Promise::MaybeRejectWithClone(JSContext* aCx,
+                                   JS::Handle<JS::Value> aValue) {
+  JS::Rooted<JSObject*> sourceScope(aCx, JS::CurrentGlobalOrNull(aCx));
+  AutoEntryScript aes(GetParentObject(), "Promise rejection");
+  JSContext* cx = aes.cx();
+  JS::Rooted<JS::Value> value(cx, aValue);
+
+  xpc::StackScopedCloneOptions options;
+  options.wrapReflectors = true;
+  StackScopedClone(cx, options, sourceScope, &value);
+  MaybeReject(aCx, value);
+}
+
 JSObject* Promise::GlobalJSObject() const {
   return mGlobal->GetGlobalJSObject();
 }

dom/promise/Promise.h

@@ -103,6 +103,9 @@ class Promise : public nsISupports, public SupportsWeakPtr<Promise> {
 
   void MaybeRejectWithUndefined();
 
+  void MaybeResolveWithClone(JSContext* aCx, JS::Handle<JS::Value> aValue);
+  void MaybeRejectWithClone(JSContext* aCx, JS::Handle<JS::Value> aValue);
+
   // DO NOT USE MaybeRejectBrokenly with in new code.  Promises should be
   // rejected with Error instances.
   // Note: MaybeRejectBrokenly is a template so we can use it with DOMException

dom/promise/moz.build

@@ -23,6 +23,7 @@ UNIFIED_SOURCES += [
 LOCAL_INCLUDES += [
     '../base',
     '../ipc',
+    '/js/xpconnect/src',
 ]
 
 include('/ipc/chromium/chromium-config.mozbuild')