1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/* 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
|