diff options
author | Fabian Kosmale <fabian.kosmale@qt.io> | 2021-06-25 21:08:35 +0200 |
---|---|---|
committer | Qt Cherry-pick Bot <cherrypick_bot@qt-project.org> | 2021-08-04 23:10:19 +0000 |
commit | 4ee4768caf2a5dd691ef961ac330baae3035e542 (patch) | |
tree | 21fb7fe4f4e8ff8aa926c369f92cffcec22e09ae /src/corelib/kernel | |
parent | 7aac325c3482089eb1441e91fe31672ce4f19f60 (diff) |
QProperty: micro optimizations
- Ensure that the allocateDependencyObserver fast path is inlined.
- Use addObserver instead of observerProperty; we know that a freshly
allocated observer does not have its prev pointer set. If prev weren't
a private member, we could simply use Q_ASSUME(ptr->prev == nullptr),
but making it public or befriending the class seems like a bad idea,
as it grants too much access to the internals.
Change-Id: Ia845f2807c70512563f7b9e1ecb85fe82b66208c
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
(cherry picked from commit 5d0095b1c2e60ecfb492c1910df70021128d663c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
Diffstat (limited to 'src/corelib/kernel')
-rw-r--r-- | src/corelib/kernel/qproperty.cpp | 2 | ||||
-rw-r--r-- | src/corelib/kernel/qproperty_p.h | 9 |
2 files changed, 8 insertions, 3 deletions
diff --git a/src/corelib/kernel/qproperty.cpp b/src/corelib/kernel/qproperty.cpp index db202ad725..5e9dfb0e2d 100644 --- a/src/corelib/kernel/qproperty.cpp +++ b/src/corelib/kernel/qproperty.cpp @@ -540,7 +540,7 @@ void QPropertyBindingData::registerWithCurrentlyEvaluatingBinding_helper(Binding QPropertyObserverPointer dependencyObserver = currentState->binding->allocateDependencyObserver(); dependencyObserver.setBindingToNotify(currentState->binding); - dependencyObserver.observeProperty(d); + d.addObserver(dependencyObserver.ptr); } void QPropertyBindingData::notifyObservers(QUntypedPropertyData *propertyDataPtr) const diff --git a/src/corelib/kernel/qproperty_p.h b/src/corelib/kernel/qproperty_p.h index 07f9099ee3..14dfd513f9 100644 --- a/src/corelib/kernel/qproperty_p.h +++ b/src/corelib/kernel/qproperty_p.h @@ -293,12 +293,17 @@ public: heapObservers->clear(); dependencyObserverCount = 0; } - QPropertyObserverPointer allocateDependencyObserver() - { + + Q_ALWAYS_INLINE QPropertyObserverPointer allocateDependencyObserver() { if (dependencyObserverCount < inlineDependencyObservers.size()) { ++dependencyObserverCount; return {&inlineDependencyObservers[dependencyObserverCount - 1]}; } + return allocateDependencyObserver_slow(); + } + + Q_NEVER_INLINE QPropertyObserverPointer allocateDependencyObserver_slow() + { ++dependencyObserverCount; if (!heapObservers) heapObservers.reset(new std::vector<QPropertyObserver>()); |