Add a tracing API for the QML engine

Change-Id: Ic03583444d586f275897d765be8e1b5e69fdd5d4
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/declarative/qml/ftw/ftw.pri

@@ -14,11 +14,13 @@ HEADERS +=  \
     $$PWD/qdeletewatcher_p.h \
     $$PWD/qrecyclepool_p.h \
     $$PWD/qflagpointer_p.h \
+    $$PWD/qdeclarativetrace_p.h \
 
 SOURCES += \
     $$PWD/qintrusivelist.cpp \
     $$PWD/qhashedstring.cpp \
     $$PWD/qdeclarativepool.cpp \
     $$PWD/qfastmetabuilder.cpp \
     $$PWD/qdeclarativethread.cpp \
+    $$PWD/qdeclarativetrace.cpp \
 

src/declarative/qml/ftw/qdeclarativepool_p.h

@@ -55,6 +55,7 @@
 
 #include <QtCore/qglobal.h>
 #include <QtCore/qstring.h>
+#include <QtCore/qurl.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -105,6 +106,7 @@ class Q_DECLARATIVE_EXPORT QDeclarativePool
 
     inline QString *NewString(const QString &);
     inline QByteArray *NewByteArray(const QByteArray &);
+    inline QUrl *NewUrl(const QUrl &);
 
     template<typename T>
     struct List {
@@ -145,6 +147,8 @@ class Q_DECLARATIVE_EXPORT QDeclarativePool
     };
     struct ByteArrayClass : public QByteArray, public Class {
     };
+    struct UrlClass : public QUrl, public Class {
+    };
 
     inline void *allocate(int size);
     void newpage();
@@ -222,6 +226,13 @@ QByteArray *QDeclarativePool::NewByteArray(const QByteArray &s)
     return rv;
 }
 
+QUrl *QDeclarativePool::NewUrl(const QUrl &s)
+{
+    QUrl *rv = New<UrlClass>();
+    *rv = s;
+    return rv;
+}
+
 void *QDeclarativePool::allocate(int size)
 {
     if (!_page || (_page->header.free + size) > (_page->memory + Page::pageSize))

src/declarative/qml/ftw/qdeclarativetrace.cpp

@@ -0,0 +1,154 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative 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 "qdeclarativetrace_p.h"
+
+#ifdef QML_ENABLE_TRACE
+#include <stdio.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+#ifdef QML_ENABLE_TRACE
+
+QDeclarativeTrace::Pool QDeclarativeTrace::logPool;
+QDeclarativeTrace::Entry *QDeclarativeTrace::first = 0;
+QDeclarativeTrace::Entry *QDeclarativeTrace::last = 0;
+
+static qint64 toNsecs(QDeclarativeTrace::TimeType time)
+{
+#ifdef Q_OS_MAC
+    static mach_timebase_info_data_t info = {0,0};
+    if (info.denom == 0)
+        mach_timebase_info(&info);
+    return time * info.numer / info.denom;
+#else
+    qint64 rv = time.tv_sec * 1000000000 + time.tv_nsec;
+    return rv;
+#endif
+}
+
+QDeclarativeTrace::Pool::Pool()
+{
+    first = New<Entry>();
+    last = first;
+}
+
+QDeclarativeTrace::Pool::~Pool()
+{
+    char buffer[128];
+    sprintf(buffer, "qml.%d.log", ::getpid());
+    FILE *out = fopen(buffer, "w");
+    if (!out) {
+        fprintf (stderr, "QML Log: Could not open %s\n", buffer);
+        return;
+    } else {
+        fprintf (stderr, "QML Log: Writing log to %s\n", buffer);
+    }
+
+    QDeclarativeTrace::Entry *cur = QDeclarativeTrace::first;
+    QByteArray indent;
+    int depth = -1;
+
+    qint64 firstTime = -1;
+
+    while (cur) {
+
+        switch (cur->type) {
+        case QDeclarativeTrace::Entry::RangeStart: {
+            RangeStart *rs = static_cast<QDeclarativeTrace::RangeStart *>(cur);
+
+            qint64 nsecs = toNsecs(rs->time);
+
+            if (firstTime == -1)
+                firstTime = nsecs;
+
+            nsecs -= firstTime;
+
+            depth++;
+            indent = QByteArray(depth * 4, ' ');
+            fprintf(out, "%s%s @%lld (%lld ns)\n", indent.constData(),
+                    rs->description, nsecs, toNsecs(rs->end->time) - nsecs - firstTime);
+            } break;
+        case QDeclarativeTrace::Entry::RangeEnd:
+            depth--;
+            indent = QByteArray(depth * 4, ' ');
+            break;
+        case QDeclarativeTrace::Entry::Detail:
+            fprintf(out, "%s  %s\n", indent.constData(),
+                    static_cast<QDeclarativeTrace::Detail *>(cur)->description);
+            break;
+        case QDeclarativeTrace::Entry::IntDetail:
+            fprintf(out, "%s  %s: %d\n", indent.constData(),
+                    static_cast<QDeclarativeTrace::Detail *>(cur)->description,
+                    static_cast<QDeclarativeTrace::IntDetail *>(cur)->value);
+            break;
+        case QDeclarativeTrace::Entry::StringDetail: {
+            QByteArray vLatin1 = static_cast<QDeclarativeTrace::StringDetail *>(cur)->value->toLatin1();
+            fprintf(out, "%s  %s: %s\n", indent.constData(),
+                    static_cast<QDeclarativeTrace::Detail *>(cur)->description,
+                    vLatin1.constData());
+            } break;
+        case QDeclarativeTrace::Entry::UrlDetail: {
+            QByteArray vLatin1 = static_cast<QDeclarativeTrace::UrlDetail *>(cur)->value->toString().toLatin1();
+            fprintf(out, "%s  %s: %s\n", indent.constData(),
+                    static_cast<QDeclarativeTrace::Detail *>(cur)->description,
+                    vLatin1.constData());
+            } break;
+        case QDeclarativeTrace::Entry::Event: {
+            Event *ev = static_cast<QDeclarativeTrace::Event *>(cur);
+            qint64 nsecs = toNsecs(ev->time) - firstTime;
+            fprintf(out, "%s  + %s @%lld +%lld ns\n", indent.constData(),
+                    ev->description, nsecs, nsecs - (toNsecs(ev->start->time) - firstTime));
+            } break;
+        case QDeclarativeTrace::Entry::Null:
+        default:
+            break;
+        }
+        cur = cur->next;
+    }
+    fclose(out);
+}
+
+#endif
+
+QT_END_NAMESPACE
+