diff options
author | Ulf Hermann <ulf.hermann@qt.io> | 2016-04-18 15:14:26 +0200 |
---|---|---|
committer | Ulf Hermann <ulf.hermann@qt.io> | 2016-04-19 08:09:21 +0000 |
commit | 23e0e26ce652cf360310ebb1e2de8283502eba2e (patch) | |
tree | e07a5078f8021daca56ba7efca0b5f672e7b2f4a | |
parent | cf28f909da1145b8f4fbb92a3bf8353d5f397f97 (diff) |
Occasionally trim the type cache
As loaded components are kept in a cache, they are never removed by the
garbage collector. So, if you periodically create new components, they
leak. This change adds a floating threshold for the number of
components. When that threshold is surpassed trimCache() is called and
unneeded components are removed.
Task-number: QTBUG-42055
Change-Id: I30e3e4ee287f6d34376713668009c67614a50e0c
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
-rw-r--r-- | src/qml/qml/qqmltypeloader.cpp | 20 | ||||
-rw-r--r-- | src/qml/qml/qqmltypeloader_p.h | 2 | ||||
-rw-r--r-- | tests/auto/qml/qqmltypeloader/data/trim_cache.qml | 8 | ||||
-rw-r--r-- | tests/auto/qml/qqmltypeloader/tst_qqmltypeloader.cpp | 30 |
4 files changed, 59 insertions, 1 deletions
diff --git a/src/qml/qml/qqmltypeloader.cpp b/src/qml/qml/qqmltypeloader.cpp index 1e671542be..0e0efcf753 100644 --- a/src/qml/qml/qqmltypeloader.cpp +++ b/src/qml/qml/qqmltypeloader.cpp @@ -1113,6 +1113,7 @@ void QQmlTypeLoader::loadThread(QQmlDataBlob *blob) } #define DATALOADER_MAXIMUM_REDIRECT_RECURSION 16 +#define TYPELOADER_MINIMUM_TRIM_THRESHOLD 64 void QQmlTypeLoader::networkReplyFinished(QNetworkReply *reply) { @@ -1592,7 +1593,8 @@ bool QQmlTypeLoader::QmldirContent::designerSupported() const Constructs a new type loader that uses the given \a engine. */ QQmlTypeLoader::QQmlTypeLoader(QQmlEngine *engine) - : m_engine(engine), m_thread(new QQmlTypeLoaderThread(this)) + : m_engine(engine), m_thread(new QQmlTypeLoaderThread(this)), + m_typeCacheTrimThreshold(TYPELOADER_MINIMUM_TRIM_THRESHOLD) { } @@ -1629,6 +1631,10 @@ QQmlTypeData *QQmlTypeLoader::getType(const QUrl &url, Mode mode) QQmlTypeData *typeData = m_typeCache.value(url); if (!typeData) { + // Trim before adding the new type, so that we don't immediately trim it away + if (m_typeCache.size() >= m_typeCacheTrimThreshold) + trimCache(); + typeData = new QQmlTypeData(url, this); // TODO: if (compiledData == 0), is it safe to omit this insertion? m_typeCache.insert(url, typeData); @@ -1933,12 +1939,22 @@ void QQmlTypeLoader::clearCache() qDeleteAll(m_importQmlDirCache); m_typeCache.clear(); + m_typeCacheTrimThreshold = TYPELOADER_MINIMUM_TRIM_THRESHOLD; m_scriptCache.clear(); m_qmldirCache.clear(); m_importDirCache.clear(); m_importQmlDirCache.clear(); } +void QQmlTypeLoader::updateTypeCacheTrimThreshold() +{ + int size = m_typeCache.size(); + if (size > m_typeCacheTrimThreshold) + m_typeCacheTrimThreshold = size * 2; + if (size < m_typeCacheTrimThreshold / 2) + m_typeCacheTrimThreshold = qMax(size * 2, TYPELOADER_MINIMUM_TRIM_THRESHOLD); +} + void QQmlTypeLoader::trimCache() { while (true) { @@ -1963,6 +1979,8 @@ void QQmlTypeLoader::trimCache() } } + updateTypeCacheTrimThreshold(); + // TODO: release any scripts which are no longer referenced by any types } diff --git a/src/qml/qml/qqmltypeloader_p.h b/src/qml/qml/qqmltypeloader_p.h index 6433601ba8..f565bcd31f 100644 --- a/src/qml/qml/qqmltypeloader_p.h +++ b/src/qml/qml/qqmltypeloader_p.h @@ -358,6 +358,7 @@ private: QQmlTypeLoaderThread *m_thread; NetworkReplies m_networkReplies; TypeCache m_typeCache; + int m_typeCacheTrimThreshold; ScriptCache m_scriptCache; QmldirCache m_qmldirCache; ImportDirCache m_importDirCache; @@ -365,6 +366,7 @@ private: template<typename Loader> void doLoad(const Loader &loader, QQmlDataBlob *blob, Mode mode); + void updateTypeCacheTrimThreshold(); friend struct PlainLoader; friend struct CachedLoader; diff --git a/tests/auto/qml/qqmltypeloader/data/trim_cache.qml b/tests/auto/qml/qqmltypeloader/data/trim_cache.qml new file mode 100644 index 0000000000..74303977dd --- /dev/null +++ b/tests/auto/qml/qqmltypeloader/data/trim_cache.qml @@ -0,0 +1,8 @@ +import QtQuick 2.2 +Rectangle +{ + objectName: "dings" + width: 100 + height: 100 + color: "blue" +} diff --git a/tests/auto/qml/qqmltypeloader/tst_qqmltypeloader.cpp b/tests/auto/qml/qqmltypeloader/tst_qqmltypeloader.cpp index 4c5b1f7e63..7045c7cbd4 100644 --- a/tests/auto/qml/qqmltypeloader/tst_qqmltypeloader.cpp +++ b/tests/auto/qml/qqmltypeloader/tst_qqmltypeloader.cpp @@ -35,6 +35,9 @@ #include <QtQml/qqmlengine.h> #include <QtQuick/qquickview.h> #include <QtQuick/qquickitem.h> +#include <QtQml/private/qqmlengine_p.h> +#include <QtQml/private/qqmltypeloader_p.h> +#include <QtQml/private/qqmlcompiler_p.h> #include "../../shared/util.h" class tst_QQMLTypeLoader : public QQmlDataTest @@ -44,6 +47,7 @@ class tst_QQMLTypeLoader : public QQmlDataTest private slots: void testLoadComplete(); void loadComponentSynchronously(); + void trimCache(); }; void tst_QQMLTypeLoader::testLoadComplete() @@ -73,6 +77,32 @@ void tst_QQMLTypeLoader::loadComponentSynchronously() QVERIFY(o); } +void tst_QQMLTypeLoader::trimCache() +{ + QQmlEngine engine; + QQmlTypeLoader &loader = QQmlEnginePrivate::get(&engine)->typeLoader; + for (int i = 0; i < 256; ++i) { + QUrl url = testFileUrl("trim_cache.qml"); + url.setQuery(QString::number(i)); + + QQmlTypeData *data = loader.getType(url); + if (i % 5 == 0) // keep references to some of them so that they aren't trimmed + data->compiledData()->addref(); + + data->release(); + } + + for (int i = 0; i < 256; ++i) { + QUrl url = testFileUrl("trim_cache.qml"); + url.setQuery(QString::number(i)); + if (i % 5 == 0) + QVERIFY(loader.isTypeLoaded(url)); + else if (i < 128) + QVERIFY(!loader.isTypeLoaded(url)); + // The cache is free to keep the others. + } +} + QTEST_MAIN(tst_QQMLTypeLoader) #include "tst_qqmltypeloader.moc" |