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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /widget/windows/WidgetTraceEvent.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'widget/windows/WidgetTraceEvent.cpp')
-rw-r--r--widget/windows/WidgetTraceEvent.cpp132
1 files changed, 132 insertions, 0 deletions
diff --git a/widget/windows/WidgetTraceEvent.cpp b/widget/windows/WidgetTraceEvent.cpp
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+++ b/widget/windows/WidgetTraceEvent.cpp
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+/* 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/. */
+
+/*
+ * Windows widget support for event loop instrumentation.
+ * See toolkit/xre/EventTracer.cpp for more details.
+ */
+
+#include <stdio.h>
+#include <windows.h>
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/WidgetTraceEvent.h"
+#include "nsAppShellCID.h"
+#include "nsComponentManagerUtils.h"
+#include "nsCOMPtr.h"
+#include "nsIAppShellService.h"
+#include "nsIBaseWindow.h"
+#include "nsIDocShell.h"
+#include "nsISupportsImpl.h"
+#include "nsIWidget.h"
+#include "nsIXULWindow.h"
+#include "nsServiceManagerUtils.h"
+#include "nsThreadUtils.h"
+#include "nsWindowDefs.h"
+
+namespace {
+
+// Used for signaling the background thread from the main thread.
+HANDLE sEventHandle = nullptr;
+
+// We need a runnable in order to find the hidden window on the main
+// thread.
+class HWNDGetter : public mozilla::Runnable {
+public:
+ HWNDGetter() : hidden_window_hwnd(nullptr) {
+ MOZ_COUNT_CTOR(HWNDGetter);
+ }
+ ~HWNDGetter() {
+ MOZ_COUNT_DTOR(HWNDGetter);
+ }
+
+ HWND hidden_window_hwnd;
+
+ NS_IMETHOD Run() override {
+ // Jump through some hoops to locate the hidden window.
+ nsCOMPtr<nsIAppShellService> appShell(do_GetService(NS_APPSHELLSERVICE_CONTRACTID));
+ nsCOMPtr<nsIXULWindow> hiddenWindow;
+
+ nsresult rv = appShell->GetHiddenWindow(getter_AddRefs(hiddenWindow));
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ nsCOMPtr<nsIDocShell> docShell;
+ rv = hiddenWindow->GetDocShell(getter_AddRefs(docShell));
+ if (NS_FAILED(rv) || !docShell) {
+ return rv;
+ }
+
+ nsCOMPtr<nsIBaseWindow> baseWindow(do_QueryInterface(docShell));
+
+ if (!baseWindow)
+ return NS_ERROR_FAILURE;
+
+ nsCOMPtr<nsIWidget> widget;
+ baseWindow->GetMainWidget(getter_AddRefs(widget));
+
+ if (!widget)
+ return NS_ERROR_FAILURE;
+
+ hidden_window_hwnd = (HWND)widget->GetNativeData(NS_NATIVE_WINDOW);
+
+ return NS_OK;
+ }
+};
+
+HWND GetHiddenWindowHWND()
+{
+ // Need to dispatch this to the main thread because plenty of
+ // the things it wants to access are main-thread-only.
+ RefPtr<HWNDGetter> getter = new HWNDGetter();
+ NS_DispatchToMainThread(getter, NS_DISPATCH_SYNC);
+ return getter->hidden_window_hwnd;
+}
+
+} // namespace
+
+namespace mozilla {
+
+bool InitWidgetTracing()
+{
+ sEventHandle = CreateEventW(nullptr, FALSE, FALSE, nullptr);
+ return sEventHandle != nullptr;
+}
+
+void CleanUpWidgetTracing()
+{
+ CloseHandle(sEventHandle);
+ sEventHandle = nullptr;
+}
+
+// This function is called from the main (UI) thread.
+void SignalTracerThread()
+{
+ if (sEventHandle != nullptr)
+ SetEvent(sEventHandle);
+}
+
+// This function is called from the background tracer thread.
+bool FireAndWaitForTracerEvent()
+{
+ MOZ_ASSERT(sEventHandle, "Tracing not initialized!");
+
+ // First, try to find the hidden window.
+ static HWND hidden_window = nullptr;
+ if (hidden_window == nullptr) {
+ hidden_window = GetHiddenWindowHWND();
+ }
+
+ if (hidden_window == nullptr)
+ return false;
+
+ // Post the tracer message into the hidden window's message queue,
+ // and then block until it's processed.
+ PostMessage(hidden_window, MOZ_WM_TRACE, 0, 0);
+ WaitForSingleObject(sEventHandle, INFINITE);
+ return true;
+}
+
+} // namespace mozilla