diff --git a/dom/events/IMEContentObserver.cpp b/dom/events/IMEContentObserver.cpp
index dccdfdceb93..0984b2aae6f 100644
--- a/dom/events/IMEContentObserver.cpp
+++ b/dom/events/IMEContentObserver.cpp
@@ -47,33 +47,6 @@ ToChar(bool aBool)
   return aBool ? "true" : "false";
 }
 
-static const char*
-ToChar(EventMessage aEventMessage)
-{
-  switch (aEventMessage) {
-    case eQuerySelectedText:
-      return "eQuerySelectedText";
-    case eQueryTextContent:
-      return "eQueryTextContent";
-    case eQueryCaretRect:
-      return "eQueryCaretRect";
-    case eQueryTextRect:
-      return "eQueryTextRect";
-    case eQueryEditorRect:
-      return "eQueryEditorRect";
-    case eQueryContentState:
-      return "eQueryContentState";
-    case eQuerySelectionAsTransferable:
-      return "eQuerySelectionAsTransferable";
-    case eQueryCharacterAtPoint:
-      return "eQueryCharacterAtPoint";
-    case eQueryDOMWidgetHittest:
-      return "eQueryDOMWidgetHittest";
-    default:
-      return "Unsupported message";
-  }
-}
-
 static const char*
 ToChar(IMEMessage aIMEMessage)
 {
diff --git a/dom/events/IMEStateManager.cpp b/dom/events/IMEStateManager.cpp
index 1a116851df2..8a0f28f63ac 100644
--- a/dom/events/IMEStateManager.cpp
+++ b/dom/events/IMEStateManager.cpp
@@ -133,29 +133,6 @@ GetIMEStateSetOpenName(IMEState::Open aOpen)
   }
 }
 
-static const char*
-GetEventMessageName(EventMessage aMessage)
-{
-  switch (aMessage) {
-    case eCompositionStart:
-      return "eCompositionStart";
-    case eCompositionEnd:
-      return "eCompositionEnd";
-    case eCompositionUpdate:
-      return "eCompositionUpdate";
-    case eCompositionChange:
-      return "eCompositionChange";
-    case eCompositionCommitAsIs:
-      return "eCompositionCommitAsIs";
-    case eCompositionCommit:
-      return "eCompositionCommit";
-    case eSetSelection:
-      return "eSetSelection";
-    default:
-      return "unacceptable event message";
-  }
-}
-
 static const char*
 GetNotifyIMEMessageName(IMEMessage aMessage)
 {
@@ -1137,7 +1114,7 @@ IMEStateManager::DispatchCompositionEvent(
      "mFlags={ mIsTrusted=%s, mPropagationStopped=%s } }, "
      "aIsSynthesized=%s), tabParent=%p",
      aEventTargetNode, aPresContext,
-     GetEventMessageName(aCompositionEvent->mMessage),
+     ToChar(aCompositionEvent->mMessage),
      GetBoolName(aCompositionEvent->mFlags.mIsTrusted),
      GetBoolName(aCompositionEvent->mFlags.mPropagationStopped),
      GetBoolName(aIsSynthesized), tabParent.get()));
@@ -1235,7 +1212,7 @@ IMEStateManager::HandleSelectionEvent(nsPresContext* aPresContext,
      "aEventTargetContent=0x%p, aSelectionEvent={ mMessage=%s, "
      "mFlags={ mIsTrusted=%s } }), tabParent=%p",
      aPresContext, aEventTargetContent,
-     GetEventMessageName(aSelectionEvent->mMessage),
+     ToChar(aSelectionEvent->mMessage),
      GetBoolName(aSelectionEvent->mFlags.mIsTrusted),
      tabParent.get()));
 
@@ -1268,7 +1245,7 @@ IMEStateManager::OnCompositionEventDiscarded(
   MOZ_LOG(sISMLog, LogLevel::Info,
     ("ISM: IMEStateManager::OnCompositionEventDiscarded(aCompositionEvent={ "
      "mMessage=%s, mFlags={ mIsTrusted=%s } })",
-     GetEventMessageName(aCompositionEvent->mMessage),
+     ToChar(aCompositionEvent->mMessage),
      GetBoolName(aCompositionEvent->mFlags.mIsTrusted)));
 
   if (!aCompositionEvent->mFlags.mIsTrusted) {
diff --git a/widget/ContentCache.cpp b/widget/ContentCache.cpp
index 4b67b35ec42..fddbf847d75 100644
--- a/widget/ContentCache.cpp
+++ b/widget/ContentCache.cpp
@@ -23,29 +23,6 @@ GetBoolName(bool aBool)
   return aBool ? "true" : "false";
 }
 
-static const char*
-GetEventMessageName(EventMessage aMessage)
-{
-  switch (aMessage) {
-    case eCompositionStart:
-      return "eCompositionStart";
-    case eCompositionEnd:
-      return "eCompositionEnd";
-    case eCompositionUpdate:
-      return "eCompositionUpdate";
-    case eCompositionChange:
-      return "eCompositionChange";
-    case eCompositionCommitAsIs:
-      return "eCompositionCommitAsIs";
-    case eCompositionCommit:
-      return "eCompositionCommit";
-    case eSetSelection:
-      return "eSetSelection";
-    default:
-      return "unacceptable event message";
-  }
-}
-
 static const char*
 GetNotificationName(const IMENotification* aNotification)
 {
@@ -851,7 +828,7 @@ ContentCacheInParent::OnCompositionEvent(const WidgetCompositionEvent& aEvent)
      "mMessage=%s, mData=\"%s\" (Length()=%u), mRanges->Length()=%u }), "
      "mPendingEventsNeedingAck=%u, mIsComposing=%s, "
      "mRequestedToCommitOrCancelComposition=%s",
-     this, GetEventMessageName(aEvent.mMessage),
+     this, ToChar(aEvent.mMessage),
      NS_ConvertUTF16toUTF8(aEvent.mData).get(), aEvent.mData.Length(),
      aEvent.mRanges ? aEvent.mRanges->Length() : 0, mPendingEventsNeedingAck,
      GetBoolName(mIsComposing),
@@ -905,7 +882,7 @@ ContentCacheInParent::OnSelectionEvent(
      "mMessage=%s, mOffset=%u, mLength=%u, mReversed=%s, "
      "mExpandToClusterBoundary=%s, mUseNativeLineBreak=%s }), "
      "mPendingEventsNeedingAck=%u, mIsComposing=%s",
-     this, GetEventMessageName(aSelectionEvent.mMessage),
+     this, ToChar(aSelectionEvent.mMessage),
      aSelectionEvent.mOffset, aSelectionEvent.mLength,
      GetBoolName(aSelectionEvent.mReversed),
      GetBoolName(aSelectionEvent.mExpandToClusterBoundary),
@@ -925,7 +902,7 @@ ContentCacheInParent::OnEventNeedingAckHandled(nsIWidget* aWidget,
   MOZ_LOG(sContentCacheLog, LogLevel::Info,
     ("ContentCacheInParent: 0x%p OnEventNeedingAckHandled(aWidget=0x%p, "
      "aMessage=%s), mPendingEventsNeedingAck=%u",
-     this, aWidget, GetEventMessageName(aMessage), mPendingEventsNeedingAck));
+     this, aWidget, ToChar(aMessage), mPendingEventsNeedingAck));
 
   MOZ_RELEASE_ASSERT(mPendingEventsNeedingAck > 0);
   if (--mPendingEventsNeedingAck) {
diff --git a/widget/EventForwards.h b/widget/EventForwards.h
index dbce89f9377..82b6f985344 100644
--- a/widget/EventForwards.h
+++ b/widget/EventForwards.h
@@ -52,6 +52,8 @@ enum EventMessage : EventMessageType
   eEventMessage_MaxValue
 };
 
+const char* ToChar(EventMessage aEventMessage);
+
 /**
  * Event class IDs
  */
@@ -72,6 +74,8 @@ enum EventClassID : EventClassIDType
 #undef NS_ROOT_EVENT_CLASS
 };
 
+const char* ToChar(EventClassID aEventClassID);
+
 typedef uint16_t Modifiers;
 
 #define NS_DEFINE_KEYNAME(aCPPName, aDOMKeyName) \
diff --git a/widget/WidgetEventImpl.cpp b/widget/WidgetEventImpl.cpp
index 381982250f5..6850a612cb0 100644
--- a/widget/WidgetEventImpl.cpp
+++ b/widget/WidgetEventImpl.cpp
@@ -14,6 +14,49 @@
 
 namespace mozilla {
 
+/******************************************************************************
+ * Global helper methods
+ ******************************************************************************/
+
+const char*
+ToChar(EventMessage aEventMessage)
+{
+  switch (aEventMessage) {
+
+#define NS_EVENT_MESSAGE(aMessage) \
+    case aMessage: \
+      return #aMessage;
+
+#include "mozilla/EventMessageList.h"
+
+#undef NS_EVENT_MESSAGE
+    default:
+      return "illegal event message";
+  }
+}
+
+const char*
+ToChar(EventClassID aEventClassID)
+{
+  switch (aEventClassID) {
+
+#define NS_ROOT_EVENT_CLASS(aPrefix, aName) \
+    case eBasic##aName##Class: \
+      return "eBasic" #aName "Class";
+
+#define NS_EVENT_CLASS(aPrefix, aName) \
+    case e##aName##Class: \
+      return "e" #aName "Class";
+
+#include "mozilla/EventClassList.h"
+
+#undef NS_EVENT_CLASS
+#undef NS_ROOT_EVENT_CLASS
+    default:
+      return "illegal event class ID";
+  }
+}
+
 /******************************************************************************
  * As*Event() implementation
  ******************************************************************************/
diff --git a/widget/windows/TSFTextStore.cpp b/widget/windows/TSFTextStore.cpp
index 6e34a456634..fc11fdc521e 100644
--- a/widget/windows/TSFTextStore.cpp
+++ b/widget/windows/TSFTextStore.cpp
@@ -534,19 +534,6 @@ GetDisplayAttrStr(const TF_DISPLAYATTRIBUTE& aDispAttr)
   return str;
 }
 
-static const char*
-GetEventMessageName(uint32_t aMessage)
-{
-  switch (aMessage) {
-    case eMouseDown:
-      return "eMouseDown";
-    case eMouseUp:
-      return "eMouseUp";
-    default:
-      return "Unknown";
-  }
-}
-
 static const char*
 GetMouseButtonName(int16_t aButton)
 {
@@ -4744,8 +4731,7 @@ TSFTextStore::OnMouseButtonEventInternal(
           "aIMENotification={ mEventMessage=%s, mOffset=%u, mCursorPos={ "
           "mX=%d, mY=%d }, mCharRect={ mX=%d, mY=%d, mWidth=%d, mHeight=%d }, "
           "mButton=%s, mButtons=%s, mModifiers=%s })",
-          this, GetEventMessageName(
-                  aIMENotification.mMouseButtonEventData.mEventMessage),
+          this, ToChar(aIMENotification.mMouseButtonEventData.mEventMessage),
           aIMENotification.mMouseButtonEventData.mOffset,
           aIMENotification.mMouseButtonEventData.mCursorPos.mX,
           aIMENotification.mMouseButtonEventData.mCursorPos.mY,