1 files changed, 57 insertions, 15 deletions

diff --git a/dom/script/ModuleScript.cpp b/dom/script/ModuleScript.cpp
index bf02f522d..28b97a3cb 100644
--- a/dom/script/ModuleScript.cpp
+++ b/dom/script/ModuleScript.cpp
@@ -26,6 +26,7 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ModuleScript)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mLoader)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mBaseURL)
   tmp->UnlinkModuleRecord();
+  tmp->mError.setUndefined();
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ModuleScript)
@@ -34,25 +35,20 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ModuleScript)
   NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRecord)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mError)
 NS_IMPL_CYCLE_COLLECTION_TRACE_END
 
 NS_IMPL_CYCLE_COLLECTING_ADDREF(ModuleScript)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(ModuleScript)
 
-ModuleScript::ModuleScript(ScriptLoader *aLoader, nsIURI* aBaseURL,
-                           JS::Handle<JSObject*> aModuleRecord)
+ModuleScript::ModuleScript(ScriptLoader *aLoader, nsIURI* aBaseURL)
  : mLoader(aLoader),
-   mBaseURL(aBaseURL),
-   mModuleRecord(aModuleRecord)
+   mBaseURL(aBaseURL)
 {
   MOZ_ASSERT(mLoader);
   MOZ_ASSERT(mBaseURL);
-  MOZ_ASSERT(mModuleRecord);
-
-  // Make module's host defined field point to this module script object.
-  // This is cleared in the UnlinkModuleRecord().
-  JS::SetModuleHostDefinedField(mModuleRecord, JS::PrivateValue(this));
-  HoldJSObjects(this);
+  MOZ_ASSERT(!mModuleRecord);
+  MOZ_ASSERT(mError.isUndefined());
 }
 
 void
@@ -63,18 +59,64 @@ ModuleScript::UnlinkModuleRecord()
     MOZ_ASSERT(JS::GetModuleHostDefinedField(mModuleRecord).toPrivate() ==
                this);
     JS::SetModuleHostDefinedField(mModuleRecord, JS::UndefinedValue());
+    mModuleRecord = nullptr;
   }
-  mModuleRecord = nullptr;
 }
 
 ModuleScript::~ModuleScript()
 {
-  if (mModuleRecord) {
-    // The object may be destroyed without being unlinked first.
-    UnlinkModuleRecord();
-  }
+  // The object may be destroyed without being unlinked first.
+  UnlinkModuleRecord();
   DropJSObjects(this);
 }
 
+void
+ModuleScript::SetModuleRecord(JS::Handle<JSObject*> aModuleRecord)
+{
+  MOZ_ASSERT(!mModuleRecord);
+  MOZ_ASSERT(mError.isUndefined());
+
+  mModuleRecord = aModuleRecord;
+
+  // Make module's host defined field point to this module script object.
+  // This is cleared in the UnlinkModuleRecord().
+  JS::SetModuleHostDefinedField(mModuleRecord, JS::PrivateValue(this));
+  HoldJSObjects(this);
+}
+
+void
+ModuleScript::SetPreInstantiationError(const JS::Value& aError)
+{
+  MOZ_ASSERT(!aError.isUndefined());
+
+  UnlinkModuleRecord();
+  mError = aError;
+
+  HoldJSObjects(this);
+}
+
+bool
+ModuleScript::IsErrored() const
+{
+  if (!mModuleRecord) {
+    MOZ_ASSERT(!mError.isUndefined());
+    return true;
+  }
+
+  return JS::IsModuleErrored(mModuleRecord);
+}
+
+JS::Value
+ModuleScript::Error() const
+{
+  MOZ_ASSERT(IsErrored());
+
+  if (!mModuleRecord) {
+    return mError;
+  }
+
+  return JS::GetModuleError(mModuleRecord);
+}
+
 } // dom namespace
 } // mozilla namespace