Add hooks for declarative memory profiler.

These macros effectively do nothing if the profiling library has not
been preloaded. However, if the library is loaded they provide some
additional context for each heap allocation, by tagging each
subsequent allocation with the QML file that caused the allocation
to occur.

Change-Id: Ib1f56d0df0664e118e04e53e22a6942317b1baed
Reviewed-by: Martin Jones <martin.jones@nokia.com>

1 files changed, 161 insertions, 0 deletions

diff --git a/src/qml/qml/qqmlmemoryprofiler.cpp b/src/qml/qml/qqmlmemoryprofiler.cpp
new file mode 100644
index 0000000000..b43ac86009
--- /dev/null
+++ b/src/qml/qml/qqmlmemoryprofiler.cpp
@@ -0,0 +1,161 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qqmlmemoryprofiler_p.h"
+#include <QUrl>
+
+QT_BEGIN_NAMESPACE
+
+enum LibraryState
+{
+    Unloaded,
+    Failed,
+    Loaded
+};
+
+static LibraryState state = Unloaded;
+
+typedef void (qmlmemprofile_stats)(int *allocCount, int *bytesAllocated);
+typedef void (qmlmemprofile_clear)();
+typedef void (qmlmemprofile_enable)();
+typedef void (qmlmemprofile_disable)();
+typedef void (qmlmemprofile_push_location)(const char *filename, int lineNumber);
+typedef void (qmlmemprofile_pop_location)();
+typedef void (qmlmemprofile_save)(const char *filename);
+typedef int (qmlmemprofile_is_enabled)();
+
+static qmlmemprofile_stats *memprofile_stats;
+static qmlmemprofile_clear *memprofile_clear;
+static qmlmemprofile_enable *memprofile_enable;
+static qmlmemprofile_disable *memprofile_disable;
+static qmlmemprofile_push_location *memprofile_push_location;
+static qmlmemprofile_pop_location *memprofile_pop_location;
+static qmlmemprofile_save *memprofile_save;
+static qmlmemprofile_is_enabled *memprofile_is_enabled;
+
+extern QFunctionPointer qt_linux_find_symbol_sys(const char *symbol);
+
+static bool openLibrary()
+{
+#if 0//def Q_OS_LINUX   [Disabled until qt_linux_find_symbol_sys is available in qtbase]
+    if (state == Unloaded) {
+        memprofile_stats = (qmlmemprofile_stats *) qt_linux_find_symbol_sys("qmlmemprofile_stats");
+        memprofile_clear = (qmlmemprofile_clear *) qt_linux_find_symbol_sys("qmlmemprofile_clear");
+        memprofile_enable = (qmlmemprofile_enable *) qt_linux_find_symbol_sys("qmlmemprofile_enable");
+        memprofile_disable = (qmlmemprofile_disable *) qt_linux_find_symbol_sys("qmlmemprofile_disable");
+        memprofile_push_location = (qmlmemprofile_push_location *) qt_linux_find_symbol_sys("qmlmemprofile_push_location");
+        memprofile_pop_location = (qmlmemprofile_pop_location *) qt_linux_find_symbol_sys("qmlmemprofile_pop_location");
+        memprofile_save = (qmlmemprofile_save *) qt_linux_find_symbol_sys("qmlmemprofile_save");
+        memprofile_is_enabled = (qmlmemprofile_is_enabled *) qt_linux_find_symbol_sys("qmlmemprofile_is_enabled");
+
+        if (memprofile_stats && memprofile_clear && memprofile_enable && memprofile_disable &&
+            memprofile_push_location && memprofile_pop_location && memprofile_save && memprofile_is_enabled)
+            state = Loaded;
+        else
+            state = Failed;
+    }
+#endif  // Q_OS_LINUX
+
+    return state == Loaded;
+}
+
+QQmlMemoryScope::QQmlMemoryScope(const QUrl &url) : pushed(false)
+{
+    if (openLibrary() && memprofile_is_enabled()) {
+        const char *location = url.path().toUtf8().constData();
+        memprofile_push_location(location, 0);
+        pushed = true;
+    }
+}
+
+QQmlMemoryScope::QQmlMemoryScope(const char *string) : pushed(false)
+{
+    if (openLibrary() && memprofile_is_enabled()) {
+        memprofile_push_location(string, 0);
+        pushed = true;
+    }
+}
+
+QQmlMemoryScope::~QQmlMemoryScope()
+{
+    if (pushed)
+        memprofile_pop_location();
+}
+
+bool QQmlMemoryProfiler::isEnabled()
+{
+    if (openLibrary())
+        return memprofile_is_enabled();
+
+    return false;
+}
+
+void QQmlMemoryProfiler::enable()
+{
+    if (openLibrary())
+        memprofile_enable();
+}
+
+void QQmlMemoryProfiler::disable()
+{
+    if (openLibrary())
+        memprofile_disable();
+}
+
+void QQmlMemoryProfiler::clear()
+{
+    if (openLibrary())
+        memprofile_clear();
+}
+
+void QQmlMemoryProfiler::stats(int *allocCount, int *bytesAllocated)
+{
+    if (openLibrary())
+        memprofile_stats(allocCount, bytesAllocated);
+}
+
+void QQmlMemoryProfiler::save(const char *filename)
+{
+    if (openLibrary())
+        memprofile_save(filename);
+}
+
+QT_END_NAMESPACE