From e30ec8244e9f7ffb87ea64ebd9eb3b44838e119c Mon Sep 17 00:00:00 2001
From: Mirko Brodesser <mbrodesser@mozilla.com>
Date: Wed, 8 Sep 2021 10:34:58 +0000
Subject: [PATCH] Bug 1728955: part 3) Add logging to `nsBaseClipboard`.
 r=masayuki

Differential Revision: https://phabricator.services.mozilla.com/D124756
---
 widget/nsBaseClipboard.cpp     | 15 ++++++++++++++-
 widget/windows/nsClipboard.cpp |  2 ++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/widget/nsBaseClipboard.cpp b/widget/nsBaseClipboard.cpp
index 91da56d0ad98..0bb4500e77e5 100644
--- a/widget/nsBaseClipboard.cpp
+++ b/widget/nsBaseClipboard.cpp
@@ -5,10 +5,14 @@
 
 #include "nsBaseClipboard.h"
 
+#include "mozilla/Logging.h"
+
 #include "nsIClipboardOwner.h"
 #include "nsCOMPtr.h"
 #include "nsXPCOM.h"
 
+static mozilla::LazyLogModule sBaseClipboardLog("BaseClipboard");
+
 nsBaseClipboard::nsBaseClipboard()
     : mEmptyingForSetData(false), mIgnoreEmptyNotification(false) {}
 
@@ -29,8 +33,13 @@ NS_IMETHODIMP nsBaseClipboard::SetData(nsITransferable* aTransferable,
                                        int32_t aWhichClipboard) {
   NS_ASSERTION(aTransferable, "clipboard given a null transferable");
 
-  if (aTransferable == mTransferable && anOwner == mClipboardOwner)
+  MOZ_LOG(sBaseClipboardLog, mozilla::LogLevel::Debug, ("%s", __FUNCTION__));
+
+  if (aTransferable == mTransferable && anOwner == mClipboardOwner) {
+    MOZ_LOG(sBaseClipboardLog, mozilla::LogLevel::Debug,
+            ("%s: skipping update.", __FUNCTION__));
     return NS_OK;
+  }
   bool selectClipPresent;
   SupportsSelectionClipboard(&selectClipPresent);
   bool findClipPresent;
@@ -62,6 +71,8 @@ NS_IMETHODIMP nsBaseClipboard::GetData(nsITransferable* aTransferable,
                                        int32_t aWhichClipboard) {
   NS_ASSERTION(aTransferable, "clipboard given a null transferable");
 
+  MOZ_LOG(sBaseClipboardLog, mozilla::LogLevel::Debug, ("%s", __FUNCTION__));
+
   bool selectClipPresent;
   SupportsSelectionClipboard(&selectClipPresent);
   bool findClipPresent;
@@ -77,6 +88,8 @@ NS_IMETHODIMP nsBaseClipboard::GetData(nsITransferable* aTransferable,
 }
 
 NS_IMETHODIMP nsBaseClipboard::EmptyClipboard(int32_t aWhichClipboard) {
+  MOZ_LOG(sBaseClipboardLog, mozilla::LogLevel::Debug, ("%s: clipboard=%i", __FUNCTION__, aWhichClipboard));
+
   bool selectClipPresent;
   SupportsSelectionClipboard(&selectClipPresent);
   bool findClipPresent;
diff --git a/widget/windows/nsClipboard.cpp b/widget/windows/nsClipboard.cpp
index 12e58895fd8b..064a5afbbefc 100644
--- a/widget/windows/nsClipboard.cpp
+++ b/widget/windows/nsClipboard.cpp
@@ -253,6 +253,8 @@ nsresult nsClipboard::SetupNativeDataObject(nsITransferable* aTransferable,
 
 //-------------------------------------------------------------------------
 NS_IMETHODIMP nsClipboard::SetNativeClipboardData(int32_t aWhichClipboard) {
+  MOZ_LOG(gWin32ClipboardLog, LogLevel::Debug, ("%s", __FUNCTION__));
+
   if (aWhichClipboard != kGlobalClipboard) {
     return NS_ERROR_FAILURE;
   }
-- 
2.11.4.GIT