Bug 790499 - Time API: Call JS_ClearDateCaches() to update Date object's timezone when the system timezone is reset, r=jlebar

dom/time/DateCacheCleaner.cpp

@@ -0,0 +1,64 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Hal.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "DateCacheCleaner.h"
+
+#include "nsIJSContextStack.h"
+#include "mozilla/StaticPtr.h"
+
+using namespace mozilla::hal;
+
+namespace mozilla {
+namespace dom {
+namespace time {
+
+class DateCacheCleaner : public SystemTimeChangeObserver
+{
+public:
+  DateCacheCleaner()
+  {
+    RegisterSystemTimeChangeObserver(this);
+  }
+
+  ~DateCacheCleaner()
+  {
+    UnregisterSystemTimeChangeObserver(this);
+  }
+  void Notify(const SystemTimeChange& aReason)
+  {
+    if (aReason == SYS_TIME_CHANGE_CLOCK) {
+      return;
+    }
+
+    nsCOMPtr<nsIThreadJSContextStack> stack =
+      do_GetService("@mozilla.org/js/xpc/ContextStack;1");
+    if (!stack) {
+      NS_WARNING("Failed to get JSContextStack");
+    }
+    JSContext *cx = stack->GetSafeJSContext();
+    if (!cx) {
+      NS_WARNING("Failed to GetSafeJSContext");
+    }
+    JS_ClearDateCaches(cx);
+  }
+
+};
+
+StaticAutoPtr<DateCacheCleaner> sDateCacheCleaner;
+
+void
+InitializeDateCacheCleaner()
+{
+  if (!sDateCacheCleaner) {
+    sDateCacheCleaner = new DateCacheCleaner();
+    ClearOnShutdown(&sDateCacheCleaner);
+  }
+}
+
+} // namespace time
+} // namespace dom
+} // namespace mozilla

dom/time/DateCacheCleaner.h

@@ -0,0 +1,18 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * InitializeDateCacheCleaner registers DateCacheCleaner to 
+ * SystemTimeChangeObserver. When time zone is changed, DateCacheCleaner calls
+ * JS_ClearDateCaches to update the time zone information.
+ */
+
+namespace mozilla {
+namespace dom {
+namespace time {
+void InitializeDateCacheCleaner();
+} //namespace time
+} //namespace dom
+} //namespace mozilla

dom/time/Makefile.in

@@ -24,11 +24,13 @@ CPPSRCS = \
   TimeManager.cpp \
   TimeService.cpp \
   TimeChangeObserver.cpp \
+  DateCacheCleaner.cpp \
   $(NULL)
 
 EXPORTS_mozilla/dom/time = \
   TimeService.h \
   TimeChangeObserver.h \
+  DateCacheCleaner.h \
   $(NULL)
 
 XPIDLSRCS = \

hal/HalTypes.h

@@ -167,6 +167,7 @@ enum FMRadioCountry {
 };
 
 typedef Observer<FMRadioOperationInformation> FMRadioObserver;
+typedef Observer<SystemTimeChange> SystemTimeChangeObserver;
 } // namespace hal
 } // namespace mozilla
 

layout/build/nsLayoutStatics.cpp

@@ -102,12 +102,14 @@
 #include "nsPermissionManager.h"
 #include "nsCookieService.h"
 #include "nsApplicationCacheService.h"
+#include "mozilla/dom/time/DateCacheCleaner.h"
 
 extern void NS_ShutdownChainItemPool();
 
 using namespace mozilla;
 using namespace mozilla::dom;
 using namespace mozilla::dom::ipc;
+using namespace mozilla::dom::time;
 
 nsrefcnt nsLayoutStatics::sLayoutStaticRefcnt = 0;
 
@@ -262,6 +264,8 @@ nsLayoutStatics::Initialize()
 
   nsDOMStorageBaseDB::Init();
 
+  InitializeDateCacheCleaner();
+
   return NS_OK;
 }