mirror of
https://github.com/mozilla/gecko-dev.git
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128 lines
3.2 KiB
C++
128 lines
3.2 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Windows widget support for event loop instrumentation.
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* See toolkit/xre/EventTracer.cpp for more details.
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*/
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#include <stdio.h>
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#include <windows.h>
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#include "mozilla/RefPtr.h"
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#include "mozilla/WidgetTraceEvent.h"
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#include "nsAppShellCID.h"
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#include "nsComponentManagerUtils.h"
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#include "nsCOMPtr.h"
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#include "nsIAppShellService.h"
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#include "nsIBaseWindow.h"
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#include "nsIDocShell.h"
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#include "nsISupportsImpl.h"
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#include "nsIWidget.h"
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#include "nsIXULWindow.h"
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#include "nsServiceManagerUtils.h"
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#include "nsThreadUtils.h"
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#include "nsWindowDefs.h"
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namespace {
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// Used for signaling the background thread from the main thread.
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HANDLE sEventHandle = nullptr;
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// We need a runnable in order to find the hidden window on the main
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// thread.
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class HWNDGetter : public mozilla::Runnable {
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public:
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HWNDGetter() : Runnable("HWNDGetter"), hidden_window_hwnd(nullptr) {}
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HWND hidden_window_hwnd;
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NS_IMETHOD Run() override {
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// Jump through some hoops to locate the hidden window.
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nsCOMPtr<nsIAppShellService> appShell(do_GetService(NS_APPSHELLSERVICE_CONTRACTID));
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nsCOMPtr<nsIXULWindow> hiddenWindow;
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nsresult rv = appShell->GetHiddenWindow(getter_AddRefs(hiddenWindow));
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if (NS_FAILED(rv)) {
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return rv;
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}
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nsCOMPtr<nsIDocShell> docShell;
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rv = hiddenWindow->GetDocShell(getter_AddRefs(docShell));
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if (NS_FAILED(rv) || !docShell) {
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return rv;
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}
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nsCOMPtr<nsIBaseWindow> baseWindow(do_QueryInterface(docShell));
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if (!baseWindow)
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return NS_ERROR_FAILURE;
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nsCOMPtr<nsIWidget> widget;
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baseWindow->GetMainWidget(getter_AddRefs(widget));
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if (!widget)
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return NS_ERROR_FAILURE;
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hidden_window_hwnd = (HWND)widget->GetNativeData(NS_NATIVE_WINDOW);
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return NS_OK;
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}
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};
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HWND GetHiddenWindowHWND()
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{
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// Need to dispatch this to the main thread because plenty of
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// the things it wants to access are main-thread-only.
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RefPtr<HWNDGetter> getter = new HWNDGetter();
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NS_DispatchToMainThread(getter, NS_DISPATCH_SYNC);
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return getter->hidden_window_hwnd;
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}
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} // namespace
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namespace mozilla {
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bool InitWidgetTracing()
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{
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sEventHandle = CreateEventW(nullptr, FALSE, FALSE, nullptr);
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return sEventHandle != nullptr;
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}
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void CleanUpWidgetTracing()
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{
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CloseHandle(sEventHandle);
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sEventHandle = nullptr;
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}
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// This function is called from the main (UI) thread.
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void SignalTracerThread()
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{
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if (sEventHandle != nullptr)
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SetEvent(sEventHandle);
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}
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// This function is called from the background tracer thread.
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bool FireAndWaitForTracerEvent()
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{
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MOZ_ASSERT(sEventHandle, "Tracing not initialized!");
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// First, try to find the hidden window.
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static HWND hidden_window = nullptr;
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if (hidden_window == nullptr) {
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hidden_window = GetHiddenWindowHWND();
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}
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if (hidden_window == nullptr)
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return false;
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// Post the tracer message into the hidden window's message queue,
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// and then block until it's processed.
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PostMessage(hidden_window, MOZ_WM_TRACE, 0, 0);
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WaitForSingleObject(sEventHandle, INFINITE);
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return true;
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}
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} // namespace mozilla
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