summaryrefslogtreecommitdiffstats
path: root/docshell/base/timeline/TimelineConsumers.cpp
blob: 805a54979c736a6636949ae4f657bcfd603fc672 (plain)
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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "TimelineConsumers.h"

#include "mozilla/ClearOnShutdown.h"
#include "mozilla/ObservedDocShell.h"
#include "mozilla/Services.h"
#include "mozilla/TimelineMarker.h"
#include "jsapi.h"
#include "nsAppRunner.h"  // for XRE_IsContentProcess, XRE_IsParentProcess
#include "nsCRT.h"
#include "nsDocShell.h"
#include "nsIObserverService.h"

namespace mozilla {

NS_IMPL_ISUPPORTS(TimelineConsumers, nsIObserver);

StaticMutex TimelineConsumers::sMutex;

// Manually manage this singleton's lifetime and destroy it before shutdown.
// This avoids the leakchecker detecting false-positive memory leaks when
// using automatic memory management (i.e. statically instantiating this
// singleton inside the `Get` method), which would automatically destroy it on
// application shutdown, but too late for the leakchecker. Sigh...
StaticRefPtr<TimelineConsumers> TimelineConsumers::sInstance;

// This flag makes sure the singleton never gets instantiated while a shutdown
// is in progress. This can actually happen, and `ClearOnShutdown` doesn't work
// in these cases.
bool TimelineConsumers::sInShutdown = false;

already_AddRefed<TimelineConsumers> TimelineConsumers::Get() {
  // Using this class is not supported yet for other processes other than
  // parent or content. To avoid accidental checks to methods like `IsEmpty`,
  // which would probably always be true in those cases, assert here.
  // Remember, there will be different singletons available to each process.

  // TODO: we have to avoid calling this function in socket process.
  MOZ_ASSERT(XRE_IsContentProcess() || XRE_IsParentProcess());

  // If we are shutting down, don't bother doing anything. Note: we can only
  // know whether or not we're in shutdown if we're instantiated.
  if (sInShutdown) {
    return nullptr;
  }

  // Note: We don't simply check `sInstance` for null-ness here, since otherwise
  // this can resurrect the TimelineConsumers pretty late during shutdown.
  // We won't know if we're in shutdown or not though, because the singleton
  // could have been destroyed or just never instantiated, so in the previous
  // conditional `sInShutdown` would be false.
  static bool firstTime = true;
  if (firstTime) {
    firstTime = false;

    StaticMutexAutoLock lock(sMutex);
    sInstance = new TimelineConsumers();

    // Make sure the initialization actually suceeds, otherwise don't allow
    // access by destroying the instance immediately.
    if (sInstance->Init()) {
      ClearOnShutdown(&sInstance);
    } else {
      sInstance->RemoveObservers();
      sInstance = nullptr;
    }
  }

  RefPtr<TimelineConsumers> copy = sInstance.get();
  return copy.forget();
}

bool TimelineConsumers::Init() {
  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
  if (!obs) {
    return false;
  }
  if (NS_WARN_IF(NS_FAILED(
          obs->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false)))) {
    return false;
  }
  return true;
}

bool TimelineConsumers::RemoveObservers() {
  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
  if (!obs) {
    return false;
  }
  if (NS_WARN_IF(NS_FAILED(
          obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID)))) {
    return false;
  }
  return true;
}

nsresult TimelineConsumers::Observe(nsISupports* aSubject, const char* aTopic,
                                    const char16_t* aData) {
  if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
    sInShutdown = true;
    RemoveObservers();
    return NS_OK;
  }

  MOZ_ASSERT(false, "TimelineConsumers got unexpected topic!");
  return NS_ERROR_UNEXPECTED;
}

TimelineConsumers::TimelineConsumers() : mActiveConsumers(0) {}

void TimelineConsumers::AddConsumer(nsDocShell* aDocShell) {
  MOZ_ASSERT(NS_IsMainThread());
  StaticMutexAutoLock lock(
      sMutex);  // for `mActiveConsumers` and `mMarkersStores`.

  UniquePtr<ObservedDocShell>& observed = aDocShell->mObserved;
  MOZ_ASSERT(!observed);

  if (mActiveConsumers == 0) {
    JS::SetProfileTimelineRecordingEnabled(true);
  }
  mActiveConsumers++;

  ObservedDocShell* obsDocShell = new ObservedDocShell(aDocShell);
  MarkersStorage* storage = static_cast<MarkersStorage*>(obsDocShell);

  observed.reset(obsDocShell);
  mMarkersStores.insertFront(storage);
}

void TimelineConsumers::RemoveConsumer(nsDocShell* aDocShell) {
  MOZ_ASSERT(NS_IsMainThread());
  StaticMutexAutoLock lock(
      sMutex);  // for `mActiveConsumers` and `mMarkersStores`.

  UniquePtr<ObservedDocShell>& observed = aDocShell->mObserved;
  MOZ_ASSERT(observed);

  mActiveConsumers--;
  if (mActiveConsumers == 0) {
    JS::SetProfileTimelineRecordingEnabled(false);
  }

  // Clear all markers from the `mTimelineMarkers` store.
  observed.get()->ClearMarkers();
  // Remove self from the `mMarkersStores` store.
  observed.get()->remove();
  // Prepare for becoming a consumer later.
  observed.reset(nullptr);
}

bool TimelineConsumers::HasConsumer(nsIDocShell* aDocShell) {
  MOZ_ASSERT(NS_IsMainThread());
  return aDocShell ? aDocShell->GetRecordProfileTimelineMarkers() : false;
}

bool TimelineConsumers::IsEmpty() {
  StaticMutexAutoLock lock(sMutex);  // for `mActiveConsumers`.
  return mActiveConsumers == 0;
}

void TimelineConsumers::AddMarkerForDocShell(nsDocShell* aDocShell,
                                             const char* aName,
                                             MarkerTracingType aTracingType,
                                             MarkerStackRequest aStackRequest) {
  MOZ_ASSERT(NS_IsMainThread());
  if (HasConsumer(aDocShell)) {
    aDocShell->mObserved->AddMarker(
        MakeUnique<TimelineMarker>(aName, aTracingType, aStackRequest));
  }
}

void TimelineConsumers::AddMarkerForDocShell(nsDocShell* aDocShell,
                                             const char* aName,
                                             const TimeStamp& aTime,
                                             MarkerTracingType aTracingType,
                                             MarkerStackRequest aStackRequest) {
  MOZ_ASSERT(NS_IsMainThread());
  if (HasConsumer(aDocShell)) {
    aDocShell->mObserved->AddMarker(
        MakeUnique<TimelineMarker>(aName, aTime, aTracingType, aStackRequest));
  }
}

void TimelineConsumers::AddMarkerForDocShell(
    nsDocShell* aDocShell, UniquePtr<AbstractTimelineMarker>&& aMarker) {
  MOZ_ASSERT(NS_IsMainThread());
  if (HasConsumer(aDocShell)) {
    aDocShell->mObserved->AddMarker(std::move(aMarker));
  }
}

void TimelineConsumers::AddMarkerForDocShell(nsIDocShell* aDocShell,
                                             const char* aName,
                                             MarkerTracingType aTracingType,
                                             MarkerStackRequest aStackRequest) {
  MOZ_ASSERT(NS_IsMainThread());
  AddMarkerForDocShell(static_cast<nsDocShell*>(aDocShell), aName, aTracingType,
                       aStackRequest);
}

void TimelineConsumers::AddMarkerForDocShell(nsIDocShell* aDocShell,
                                             const char* aName,
                                             const TimeStamp& aTime,
                                             MarkerTracingType aTracingType,
                                             MarkerStackRequest aStackRequest) {
  MOZ_ASSERT(NS_IsMainThread());
  AddMarkerForDocShell(static_cast<nsDocShell*>(aDocShell), aName, aTime,
                       aTracingType, aStackRequest);
}

void TimelineConsumers::AddMarkerForDocShell(
    nsIDocShell* aDocShell, UniquePtr<AbstractTimelineMarker>&& aMarker) {
  MOZ_ASSERT(NS_IsMainThread());
  AddMarkerForDocShell(static_cast<nsDocShell*>(aDocShell), std::move(aMarker));
}

void TimelineConsumers::AddMarkerForAllObservedDocShells(
    const char* aName, MarkerTracingType aTracingType,
    MarkerStackRequest aStackRequest /* = STACK */) {
  bool isMainThread = NS_IsMainThread();
  StaticMutexAutoLock lock(sMutex);  // for `mMarkersStores`.

  for (MarkersStorage* storage = mMarkersStores.getFirst(); storage != nullptr;
       storage = storage->getNext()) {
    UniquePtr<AbstractTimelineMarker> marker =
        MakeUnique<TimelineMarker>(aName, aTracingType, aStackRequest);
    if (isMainThread) {
      storage->AddMarker(std::move(marker));
    } else {
      storage->AddOTMTMarker(std::move(marker));
    }
  }
}

void TimelineConsumers::AddMarkerForAllObservedDocShells(
    const char* aName, const TimeStamp& aTime, MarkerTracingType aTracingType,
    MarkerStackRequest aStackRequest /* = STACK */) {
  bool isMainThread = NS_IsMainThread();
  StaticMutexAutoLock lock(sMutex);  // for `mMarkersStores`.

  for (MarkersStorage* storage = mMarkersStores.getFirst(); storage != nullptr;
       storage = storage->getNext()) {
    UniquePtr<AbstractTimelineMarker> marker =
        MakeUnique<TimelineMarker>(aName, aTime, aTracingType, aStackRequest);
    if (isMainThread) {
      storage->AddMarker(std::move(marker));
    } else {
      storage->AddOTMTMarker(std::move(marker));
    }
  }
}

void TimelineConsumers::AddMarkerForAllObservedDocShells(
    UniquePtr<AbstractTimelineMarker>& aMarker) {
  bool isMainThread = NS_IsMainThread();
  StaticMutexAutoLock lock(sMutex);  // for `mMarkersStores`.

  for (MarkersStorage* storage = mMarkersStores.getFirst(); storage != nullptr;
       storage = storage->getNext()) {
    UniquePtr<AbstractTimelineMarker> clone = aMarker->Clone();
    if (isMainThread) {
      storage->AddMarker(std::move(clone));
    } else {
      storage->AddOTMTMarker(std::move(clone));
    }
  }
}

void TimelineConsumers::PopMarkers(
    nsDocShell* aDocShell, JSContext* aCx,
    nsTArray<dom::ProfileTimelineMarker>& aStore) {
  MOZ_ASSERT(NS_IsMainThread());

  if (!aDocShell || !aDocShell->mObserved) {
    return;
  }

  aDocShell->mObserved->PopMarkers(aCx, aStore);
}

}  // namespace mozilla