InputTracer: Create tracker for tracing synthetic events
Allow the creation of a trace tracker for a synthetic event that does
not stem from an inbound input event. This is used for any dispatching
cycle that has a non-input event root, such as ANR timers, window
removals, API interactions (e.g. pilfer pointers), etc.
Any key or motion events generated for this synthetic event should be
traced as a derived event. We achieve this by passing the trace tracker
through the dispatching pipeline, and tracing all of the synthesized
events for that root using the same tracker.
Since all synthetic events can now be traced, we can now enforce that
all dispatched events have been previously traced as either an inbound
or derived event. This makes the event cookie non-nullable.
Bug: 210460522
Test: atest inputflinger_tests
Change-Id: I3417aee300edc251e2f7cb76c1f719502a5f5b8b
diff --git a/services/inputflinger/dispatcher/CancelationOptions.h b/services/inputflinger/dispatcher/CancelationOptions.h
index 83e6a60..9c73f03 100644
--- a/services/inputflinger/dispatcher/CancelationOptions.h
+++ b/services/inputflinger/dispatcher/CancelationOptions.h
@@ -16,6 +16,8 @@
#pragma once
+#include "trace/EventTrackerInterface.h"
+
#include <input/Input.h>
#include <bitset>
#include <optional>
@@ -51,7 +53,13 @@
// The specific pointers to cancel, or nullopt to cancel all pointer events
std::optional<std::bitset<MAX_POINTER_ID + 1>> pointerIds = std::nullopt;
- CancelationOptions(Mode mode, const char* reason) : mode(mode), reason(reason) {}
+ const std::unique_ptr<trace::EventTrackerInterface>& traceTracker;
+
+ explicit CancelationOptions(Mode mode, const char* reason,
+ const std::unique_ptr<trace::EventTrackerInterface>& traceTracker)
+ : mode(mode), reason(reason), traceTracker(traceTracker) {}
+ CancelationOptions(const CancelationOptions&) = delete;
+ CancelationOptions operator=(const CancelationOptions&) = delete;
};
} // namespace inputdispatcher
diff --git a/services/inputflinger/dispatcher/InputDispatcher.cpp b/services/inputflinger/dispatcher/InputDispatcher.cpp
index 56b0c8f..f06caa6 100644
--- a/services/inputflinger/dispatcher/InputDispatcher.cpp
+++ b/services/inputflinger/dispatcher/InputDispatcher.cpp
@@ -862,6 +862,30 @@
}
}
+class ScopedSyntheticEventTracer {
+public:
+ ScopedSyntheticEventTracer(std::unique_ptr<trace::InputTracerInterface>& tracer)
+ : mTracer(tracer) {
+ if (mTracer) {
+ mEventTracker = mTracer->createTrackerForSyntheticEvent();
+ }
+ }
+
+ ~ScopedSyntheticEventTracer() {
+ if (mTracer) {
+ mTracer->eventProcessingComplete(*mEventTracker);
+ }
+ }
+
+ const std::unique_ptr<trace::EventTrackerInterface>& getTracker() const {
+ return mEventTracker;
+ }
+
+private:
+ std::unique_ptr<trace::InputTracerInterface>& mTracer;
+ std::unique_ptr<trace::EventTrackerInterface> mEventTracker;
+};
+
} // namespace
// --- InputDispatcher ---
@@ -1479,8 +1503,9 @@
switch (entry.type) {
case EventEntry::Type::KEY: {
- CancelationOptions options(CancelationOptions::Mode::CANCEL_NON_POINTER_EVENTS, reason);
const KeyEntry& keyEntry = static_cast<const KeyEntry&>(entry);
+ CancelationOptions options(CancelationOptions::Mode::CANCEL_NON_POINTER_EVENTS, reason,
+ keyEntry.traceTracker);
options.displayId = keyEntry.displayId;
options.deviceId = keyEntry.deviceId;
synthesizeCancelationEventsForAllConnectionsLocked(options);
@@ -1489,13 +1514,14 @@
case EventEntry::Type::MOTION: {
const MotionEntry& motionEntry = static_cast<const MotionEntry&>(entry);
if (motionEntry.source & AINPUT_SOURCE_CLASS_POINTER) {
- CancelationOptions options(CancelationOptions::Mode::CANCEL_POINTER_EVENTS, reason);
+ CancelationOptions options(CancelationOptions::Mode::CANCEL_POINTER_EVENTS, reason,
+ motionEntry.traceTracker);
options.displayId = motionEntry.displayId;
options.deviceId = motionEntry.deviceId;
synthesizeCancelationEventsForAllConnectionsLocked(options);
} else {
CancelationOptions options(CancelationOptions::Mode::CANCEL_NON_POINTER_EVENTS,
- reason);
+ reason, motionEntry.traceTracker);
options.displayId = motionEntry.displayId;
options.deviceId = motionEntry.deviceId;
synthesizeCancelationEventsForAllConnectionsLocked(options);
@@ -1630,7 +1656,9 @@
resetKeyRepeatLocked();
}
- CancelationOptions options(CancelationOptions::Mode::CANCEL_ALL_EVENTS, "device was reset");
+ ScopedSyntheticEventTracer traceContext(mTracer);
+ CancelationOptions options(CancelationOptions::Mode::CANCEL_ALL_EVENTS, "device was reset",
+ traceContext.getTracker());
options.deviceId = entry.deviceId;
synthesizeCancelationEventsForAllConnectionsLocked(options);
@@ -2019,7 +2047,7 @@
CancelationOptions::Mode mode(
isPointerEvent ? CancelationOptions::Mode::CANCEL_POINTER_EVENTS
: CancelationOptions::Mode::CANCEL_NON_POINTER_EVENTS);
- CancelationOptions options(mode, "input event injection failed");
+ CancelationOptions options(mode, "input event injection failed", entry->traceTracker);
options.displayId = entry->displayId;
synthesizeCancelationEventsForMonitorsLocked(options);
return true;
@@ -2125,8 +2153,9 @@
if (connection->status != Connection::Status::NORMAL) {
return;
}
+ ScopedSyntheticEventTracer traceContext(mTracer);
CancelationOptions options(CancelationOptions::Mode::CANCEL_ALL_EVENTS,
- "application not responding");
+ "application not responding", traceContext.getTracker());
sp<WindowInfoHandle> windowHandle;
if (!connection->monitor) {
@@ -3521,6 +3550,10 @@
LOG(INFO) << "Canceling pointers for device " << resolvedMotion->deviceId << " in "
<< connection->getInputChannelName() << " with event "
<< cancelEvent->getDescription();
+ if (mTracer) {
+ static_cast<MotionEntry&>(*cancelEvent).traceTracker =
+ mTracer->traceDerivedEvent(*cancelEvent, *resolvedMotion->traceTracker);
+ }
std::unique_ptr<DispatchEntry> cancelDispatchEntry =
createDispatchEntry(mIdGenerator, inputTarget, std::move(cancelEvent),
ftl::Flags<InputTarget::Flags>(), mWindowInfosVsyncId,
@@ -3758,7 +3791,8 @@
keyEntry.metaState, keyEntry.repeatCount,
keyEntry.downTime, keyEntry.eventTime);
if (mTracer) {
- mTracer->traceEventDispatch(*dispatchEntry, keyEntry.traceTracker.get());
+ ensureEventTraced(keyEntry);
+ mTracer->traceEventDispatch(*dispatchEntry, *keyEntry.traceTracker);
}
break;
}
@@ -3771,7 +3805,8 @@
const MotionEntry& motionEntry = static_cast<const MotionEntry&>(eventEntry);
status = publishMotionEvent(*connection, *dispatchEntry);
if (mTracer) {
- mTracer->traceEventDispatch(*dispatchEntry, motionEntry.traceTracker.get());
+ ensureEventTraced(motionEntry);
+ mTracer->traceEventDispatch(*dispatchEntry, *motionEntry.traceTracker);
}
break;
}
@@ -4150,6 +4185,11 @@
switch (cancelationEventEntry->type) {
case EventEntry::Type::KEY: {
+ if (mTracer) {
+ static_cast<KeyEntry&>(*cancelationEventEntry).traceTracker =
+ mTracer->traceDerivedEvent(*cancelationEventEntry,
+ *options.traceTracker);
+ }
const auto& keyEntry = static_cast<const KeyEntry&>(*cancelationEventEntry);
if (window) {
addWindowTargetLocked(window, InputTarget::DispatchMode::AS_IS,
@@ -4161,6 +4201,11 @@
break;
}
case EventEntry::Type::MOTION: {
+ if (mTracer) {
+ static_cast<MotionEntry&>(*cancelationEventEntry).traceTracker =
+ mTracer->traceDerivedEvent(*cancelationEventEntry,
+ *options.traceTracker);
+ }
const auto& motionEntry = static_cast<const MotionEntry&>(*cancelationEventEntry);
if (window) {
std::bitset<MAX_POINTER_ID + 1> pointerIds;
@@ -4208,6 +4253,9 @@
}
if (targets.size() != 1) LOG(FATAL) << __func__ << ": InputTarget not created";
+ if (mTracer) {
+ mTracer->dispatchToTargetHint(*options.traceTracker, targets[0]);
+ }
enqueueDispatchEntryLocked(connection, std::move(cancelationEventEntry), targets[0]);
}
@@ -4219,7 +4267,8 @@
void InputDispatcher::synthesizePointerDownEventsForConnectionLocked(
const nsecs_t downTime, const std::shared_ptr<Connection>& connection,
- ftl::Flags<InputTarget::Flags> targetFlags) {
+ ftl::Flags<InputTarget::Flags> targetFlags,
+ const std::unique_ptr<trace::EventTrackerInterface>& traceTracker) {
if (connection->status != Connection::Status::NORMAL) {
return;
}
@@ -4248,6 +4297,10 @@
std::vector<InputTarget> targets{};
switch (downEventEntry->type) {
case EventEntry::Type::MOTION: {
+ if (mTracer) {
+ static_cast<MotionEntry&>(*downEventEntry).traceTracker =
+ mTracer->traceDerivedEvent(*downEventEntry, *traceTracker);
+ }
const auto& motionEntry = static_cast<const MotionEntry&>(*downEventEntry);
if (windowHandle != nullptr) {
std::bitset<MAX_POINTER_ID + 1> pointerIds;
@@ -4285,6 +4338,9 @@
}
if (targets.size() != 1) LOG(FATAL) << __func__ << ": InputTarget not created";
+ if (mTracer) {
+ mTracer->dispatchToTargetHint(*traceTracker, targets[0]);
+ }
enqueueDispatchEntryLocked(connection, std::move(downEventEntry), targets[0]);
}
@@ -5222,6 +5278,7 @@
}
LOG(INFO) << "setInputWindows displayId=" << displayId << " " << windowList;
}
+ ScopedSyntheticEventTracer traceContext(mTracer);
// Check preconditions for new input windows
for (const sp<WindowInfoHandle>& window : windowInfoHandles) {
@@ -5261,7 +5318,7 @@
std::optional<FocusResolver::FocusChanges> changes =
mFocusResolver.setInputWindows(displayId, windowHandles);
if (changes) {
- onFocusChangedLocked(*changes, removedFocusedWindowHandle);
+ onFocusChangedLocked(*changes, traceContext.getTracker(), removedFocusedWindowHandle);
}
std::unordered_map<int32_t, TouchState>::iterator stateIt =
@@ -5274,7 +5331,7 @@
LOG(INFO) << "Touched window was removed: " << touchedWindow.windowHandle->getName()
<< " in display %" << displayId;
CancelationOptions options(CancelationOptions::Mode::CANCEL_POINTER_EVENTS,
- "touched window was removed");
+ "touched window was removed", traceContext.getTracker());
synthesizeCancelationEventsForWindowLocked(touchedWindow.windowHandle, options);
// Since we are about to drop the touch, cancel the events for the wallpaper as
// well.
@@ -5375,6 +5432,7 @@
}
{ // acquire lock
std::scoped_lock _l(mLock);
+ ScopedSyntheticEventTracer traceContext(mTracer);
if (mFocusedDisplayId != displayId) {
sp<IBinder> oldFocusedWindowToken =
@@ -5387,7 +5445,8 @@
}
CancelationOptions
options(CancelationOptions::Mode::CANCEL_NON_POINTER_EVENTS,
- "The display which contains this window no longer has focus.");
+ "The display which contains this window no longer has focus.",
+ traceContext.getTracker());
options.displayId = ADISPLAY_ID_NONE;
synthesizeCancelationEventsForWindowLocked(windowHandle, options);
}
@@ -5612,19 +5671,22 @@
}
// Synthesize cancel for old window and down for new window.
+ ScopedSyntheticEventTracer traceContext(mTracer);
std::shared_ptr<Connection> fromConnection = getConnectionLocked(fromToken);
std::shared_ptr<Connection> toConnection = getConnectionLocked(toToken);
if (fromConnection != nullptr && toConnection != nullptr) {
fromConnection->inputState.mergePointerStateTo(toConnection->inputState);
CancelationOptions options(CancelationOptions::Mode::CANCEL_POINTER_EVENTS,
- "transferring touch from this window to another window");
+ "transferring touch from this window to another window",
+ traceContext.getTracker());
synthesizeCancelationEventsForWindowLocked(fromWindowHandle, options, fromConnection);
synthesizePointerDownEventsForConnectionLocked(downTimeInTarget, toConnection,
- newTargetFlags);
+ newTargetFlags,
+ traceContext.getTracker());
// Check if the wallpaper window should deliver the corresponding event.
transferWallpaperTouch(oldTargetFlags, newTargetFlags, fromWindowHandle, toWindowHandle,
- *state, deviceId, pointers);
+ *state, deviceId, pointers, traceContext.getTracker());
}
} // release lock
@@ -5692,7 +5754,9 @@
ALOGD("Resetting and dropping all events (%s).", reason);
}
- CancelationOptions options(CancelationOptions::Mode::CANCEL_ALL_EVENTS, reason);
+ ScopedSyntheticEventTracer traceContext(mTracer);
+ CancelationOptions options(CancelationOptions::Mode::CANCEL_ALL_EVENTS, reason,
+ traceContext.getTracker());
synthesizeCancelationEventsForAllConnectionsLocked(options);
resetKeyRepeatLocked();
@@ -6087,12 +6151,13 @@
return BAD_VALUE;
}
+ ScopedSyntheticEventTracer traceContext(mTracer);
for (const DeviceId deviceId : deviceIds) {
TouchState& state = *statePtr;
TouchedWindow& window = *windowPtr;
// Send cancel events to all the input channels we're stealing from.
CancelationOptions options(CancelationOptions::Mode::CANCEL_POINTER_EVENTS,
- "input channel stole pointer stream");
+ "input channel stole pointer stream", traceContext.getTracker());
options.deviceId = deviceId;
options.displayId = displayId;
std::vector<PointerProperties> pointers = window.getTouchingPointers(deviceId);
@@ -6516,7 +6581,8 @@
CancelationOptions options(CancelationOptions::Mode::CANCEL_FALLBACK_EVENTS,
"application handled the original non-fallback key "
"or is no longer a foreground target, "
- "canceling previously dispatched fallback key");
+ "canceling previously dispatched fallback key",
+ keyEntry.traceTracker);
options.keyCode = *fallbackKeyCode;
synthesizeCancelationEventsForWindowLocked(windowHandle, options, connection);
}
@@ -6598,7 +6664,8 @@
const auto windowHandle = getWindowHandleLocked(connection->getToken());
if (windowHandle != nullptr) {
CancelationOptions options(CancelationOptions::Mode::CANCEL_FALLBACK_EVENTS,
- "canceling fallback, policy no longer desires it");
+ "canceling fallback, policy no longer desires it",
+ keyEntry.traceTracker);
options.keyCode = *fallbackKeyCode;
synthesizeCancelationEventsForWindowLocked(windowHandle, options, connection);
}
@@ -6736,16 +6803,19 @@
std::scoped_lock _l(mLock);
std::optional<FocusResolver::FocusChanges> changes =
mFocusResolver.setFocusedWindow(request, getWindowHandlesLocked(request.displayId));
+ ScopedSyntheticEventTracer traceContext(mTracer);
if (changes) {
- onFocusChangedLocked(*changes);
+ onFocusChangedLocked(*changes, traceContext.getTracker());
}
} // release lock
// Wake up poll loop since it may need to make new input dispatching choices.
mLooper->wake();
}
-void InputDispatcher::onFocusChangedLocked(const FocusResolver::FocusChanges& changes,
- const sp<WindowInfoHandle> removedFocusedWindowHandle) {
+void InputDispatcher::onFocusChangedLocked(
+ const FocusResolver::FocusChanges& changes,
+ const std::unique_ptr<trace::EventTrackerInterface>& traceTracker,
+ const sp<WindowInfoHandle> removedFocusedWindowHandle) {
if (changes.oldFocus) {
const auto resolvedWindow = removedFocusedWindowHandle != nullptr
? removedFocusedWindowHandle
@@ -6754,7 +6824,7 @@
LOG(FATAL) << __func__ << ": Previously focused token did not have a window";
}
CancelationOptions options(CancelationOptions::Mode::CANCEL_NON_POINTER_EVENTS,
- "focus left window");
+ "focus left window", traceTracker);
synthesizeCancelationEventsForWindowLocked(resolvedWindow, options);
enqueueFocusEventLocked(changes.oldFocus, /*hasFocus=*/false, changes.reason);
}
@@ -6907,9 +6977,10 @@
void InputDispatcher::cancelCurrentTouch() {
{
std::scoped_lock _l(mLock);
+ ScopedSyntheticEventTracer traceContext(mTracer);
ALOGD("Canceling all ongoing pointer gestures on all displays.");
CancelationOptions options(CancelationOptions::Mode::CANCEL_POINTER_EVENTS,
- "cancel current touch");
+ "cancel current touch", traceContext.getTracker());
synthesizeCancelationEventsForAllConnectionsLocked(options);
mTouchStatesByDisplay.clear();
@@ -6959,12 +7030,12 @@
}
}
-void InputDispatcher::transferWallpaperTouch(ftl::Flags<InputTarget::Flags> oldTargetFlags,
- ftl::Flags<InputTarget::Flags> newTargetFlags,
- const sp<WindowInfoHandle> fromWindowHandle,
- const sp<WindowInfoHandle> toWindowHandle,
- TouchState& state, int32_t deviceId,
- const std::vector<PointerProperties>& pointers) {
+void InputDispatcher::transferWallpaperTouch(
+ ftl::Flags<InputTarget::Flags> oldTargetFlags,
+ ftl::Flags<InputTarget::Flags> newTargetFlags, const sp<WindowInfoHandle> fromWindowHandle,
+ const sp<WindowInfoHandle> toWindowHandle, TouchState& state, int32_t deviceId,
+ const std::vector<PointerProperties>& pointers,
+ const std::unique_ptr<trace::EventTrackerInterface>& traceTracker) {
const bool oldHasWallpaper = oldTargetFlags.test(InputTarget::Flags::FOREGROUND) &&
fromWindowHandle->getInfo()->inputConfig.test(
gui::WindowInfo::InputConfig::DUPLICATE_TOUCH_TO_WALLPAPER);
@@ -6982,7 +7053,7 @@
if (oldWallpaper != nullptr) {
CancelationOptions options(CancelationOptions::Mode::CANCEL_POINTER_EVENTS,
- "transferring touch focus to another window");
+ "transferring touch focus to another window", traceTracker);
state.removeWindowByToken(oldWallpaper->getToken());
synthesizeCancelationEventsForWindowLocked(oldWallpaper, options);
}
@@ -7002,7 +7073,7 @@
getConnectionLocked(toWindowHandle->getToken());
toConnection->inputState.mergePointerStateTo(wallpaperConnection->inputState);
synthesizePointerDownEventsForConnectionLocked(downTimeInTarget, wallpaperConnection,
- wallpaperFlags);
+ wallpaperFlags, traceTracker);
}
}
}
diff --git a/services/inputflinger/dispatcher/InputDispatcher.h b/services/inputflinger/dispatcher/InputDispatcher.h
index 269bfdd..d6eba64 100644
--- a/services/inputflinger/dispatcher/InputDispatcher.h
+++ b/services/inputflinger/dispatcher/InputDispatcher.h
@@ -628,7 +628,8 @@
void synthesizePointerDownEventsForConnectionLocked(
const nsecs_t downTime, const std::shared_ptr<Connection>& connection,
- ftl::Flags<InputTarget::Flags> targetFlags) REQUIRES(mLock);
+ ftl::Flags<InputTarget::Flags> targetFlags,
+ const std::unique_ptr<trace::EventTrackerInterface>& traceTracker) REQUIRES(mLock);
// Splitting motion events across windows. When splitting motion event for a target,
// splitDownTime refers to the time of first 'down' event on that particular target
@@ -657,6 +658,7 @@
void doInterceptKeyBeforeDispatchingCommand(const sp<IBinder>& focusedWindowToken,
const KeyEntry& entry) REQUIRES(mLock);
void onFocusChangedLocked(const FocusResolver::FocusChanges& changes,
+ const std::unique_ptr<trace::EventTrackerInterface>& traceTracker,
const sp<gui::WindowInfoHandle> removedFocusedWindowHandle = nullptr)
REQUIRES(mLock);
void sendFocusChangedCommandLocked(const sp<IBinder>& oldToken, const sp<IBinder>& newToken)
@@ -704,7 +706,9 @@
const sp<android::gui::WindowInfoHandle> fromWindowHandle,
const sp<android::gui::WindowInfoHandle> toWindowHandle,
TouchState& state, int32_t deviceId,
- const std::vector<PointerProperties>& pointers) REQUIRES(mLock);
+ const std::vector<PointerProperties>& pointers,
+ const std::unique_ptr<trace::EventTrackerInterface>& traceTracker)
+ REQUIRES(mLock);
sp<android::gui::WindowInfoHandle> findWallpaperWindowBelow(
const sp<android::gui::WindowInfoHandle>& windowHandle) const REQUIRES(mLock);
diff --git a/services/inputflinger/dispatcher/trace/InputTracer.cpp b/services/inputflinger/dispatcher/trace/InputTracer.cpp
index d16cbf7..83ed452 100644
--- a/services/inputflinger/dispatcher/trace/InputTracer.cpp
+++ b/services/inputflinger/dispatcher/trace/InputTracer.cpp
@@ -65,6 +65,10 @@
event);
}
+inline auto getId(const trace::TracedEvent& v) {
+ return std::visit([](const auto& event) { return event.id; }, v);
+}
+
} // namespace
// --- InputTracer ---
@@ -89,6 +93,12 @@
return std::make_unique<EventTrackerImpl>(std::move(eventState), /*isDerived=*/false);
}
+std::unique_ptr<EventTrackerInterface> InputTracer::createTrackerForSyntheticEvent() {
+ // Create a new EventState to track events derived from this tracker.
+ return std::make_unique<EventTrackerImpl>(std::make_shared<EventState>(*this),
+ /*isDerived=*/false);
+}
+
void InputTracer::dispatchToTargetHint(const EventTrackerInterface& cookie,
const InputTarget& target) {
if (isDerivedCookie(cookie)) {
@@ -140,7 +150,8 @@
}
void InputTracer::traceEventDispatch(const DispatchEntry& dispatchEntry,
- const EventTrackerInterface* cookie) {
+ const EventTrackerInterface& cookie) {
+ auto& eventState = getState(cookie);
const EventEntry& entry = *dispatchEntry.eventEntry;
// TODO(b/328618922): Remove resolved key repeats after making repeatCount non-mutable.
// The KeyEntry's repeatCount is mutable and can be modified after an event is initially traced,
@@ -159,9 +170,13 @@
LOG(FATAL) << "Cannot trace EventEntry of type: " << ftl::enum_string(entry.type);
}
- if (!cookie) {
- // This event was not tracked as an inbound event, so trace it now.
- writeEventToBackend(traced, *mBackend);
+ auto tracedEventIt =
+ std::find_if(eventState->events.begin(), eventState->events.end(),
+ [&traced](const auto& event) { return getId(traced) == getId(event); });
+ if (tracedEventIt == eventState->events.end()) {
+ LOG(FATAL)
+ << __func__
+ << ": Failed to find a previously traced event that matches the dispatched event";
}
// The vsyncId only has meaning if the event is targeting a window.
diff --git a/services/inputflinger/dispatcher/trace/InputTracer.h b/services/inputflinger/dispatcher/trace/InputTracer.h
index 25a5651..529c0fa 100644
--- a/services/inputflinger/dispatcher/trace/InputTracer.h
+++ b/services/inputflinger/dispatcher/trace/InputTracer.h
@@ -42,11 +42,12 @@
InputTracer& operator=(const InputTracer&) = delete;
std::unique_ptr<EventTrackerInterface> traceInboundEvent(const EventEntry&) override;
+ std::unique_ptr<EventTrackerInterface> createTrackerForSyntheticEvent() override;
void dispatchToTargetHint(const EventTrackerInterface&, const InputTarget&) override;
void eventProcessingComplete(const EventTrackerInterface&) override;
std::unique_ptr<EventTrackerInterface> traceDerivedEvent(const EventEntry&,
const EventTrackerInterface&) override;
- void traceEventDispatch(const DispatchEntry&, const EventTrackerInterface*) override;
+ void traceEventDispatch(const DispatchEntry&, const EventTrackerInterface&) override;
private:
std::unique_ptr<InputTracingBackendInterface> mBackend;
diff --git a/services/inputflinger/dispatcher/trace/InputTracerInterface.h b/services/inputflinger/dispatcher/trace/InputTracerInterface.h
index daf716f..609d10c 100644
--- a/services/inputflinger/dispatcher/trace/InputTracerInterface.h
+++ b/services/inputflinger/dispatcher/trace/InputTracerInterface.h
@@ -52,6 +52,15 @@
* to track the event's lifecycle inside InputDispatcher.
*/
virtual std::unique_ptr<EventTrackerInterface> traceInboundEvent(const EventEntry&) = 0;
+
+ /**
+ * Create a trace tracker for a synthetic event that does not stem from an inbound input event.
+ * This includes things like generating cancellations or down events for various reasons,
+ * such as ANR, pilfering, transfer touch, etc. Any key or motion events generated for this
+ * synthetic event should be traced as a derived event using {@link #traceDerivedEvent}.
+ */
+ virtual std::unique_ptr<EventTrackerInterface> createTrackerForSyntheticEvent() = 0;
+
/**
* Notify the tracer that the traced event will be sent to the given InputTarget.
* The tracer may change how the event is logged depending on the target. For example,
@@ -89,11 +98,11 @@
/**
* Trace an input event being successfully dispatched to a window. The dispatched event may
- * be a previously traced inbound event, or it may be a synthesized event that has not been
- * previously traced. For inbound events that were previously traced, the EventTracker cookie
- * must be provided. For events that were not previously traced, the cookie must be null.
+ * be a previously traced inbound event, or it may be a synthesized event. All dispatched events
+ * must have been previously traced, so the trace tracker associated with the event must be
+ * provided.
*/
- virtual void traceEventDispatch(const DispatchEntry&, const EventTrackerInterface*) = 0;
+ virtual void traceEventDispatch(const DispatchEntry&, const EventTrackerInterface&) = 0;
};
} // namespace android::inputdispatcher::trace