Async: add runtime executor tracing for easier debugging

1 files changed, 73 insertions, 0 deletions

diff --git a/async/src/debug.cpp b/async/src/debug.cpp
new file mode 100644
index 0000000..9dfad1a
--- /dev/null
+++ b/async/src/debug.cpp
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2015  Daniel Vrátil <dvratil@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "debug.h"
+#include "async.h"
+
+#include <QStringBuilder>
+
+#ifdef __GNUG__
+#include <cxxabi.h>
+#include <memory>
+#endif
+
+namespace Async
+{
+
+Q_LOGGING_CATEGORY(Debug, "org.kde.async", QtWarningMsg);
+Q_LOGGING_CATEGORY(Trace, "org.kde.async.trace", QtWarningMsg);
+
+QString demangleName(const char *name)
+{
+#ifdef __GNUG__
+    int status = 1; // uses -3 to 0 error codes
+    std::unique_ptr<char, void(*)(void*)> demangled(abi::__cxa_demangle(name, 0, 0, &status), std::free);
+    if (status == 0) {
+        return QString(demangled.get());
+    }
+#endif
+    return QString(name);
+}
+
+}
+
+using namespace Async;
+
+int Tracer::lastId = 0;
+
+Tracer::Tracer(Private::Execution *execution)
+    : mId(lastId++)
+    , mExecution(execution)
+{
+    msg(Async::Tracer::Start);
+}
+
+Tracer::~Tracer()
+{
+    msg(Async::Tracer::End);
+    // FIXME: Does this work on parallel executions?
+    --lastId;
+    --mId;
+}
+
+void Tracer::msg(Tracer::MsgType msgType)
+{
+    qCDebug(Trace).nospace() << (QString().fill(QLatin1Char(' '), mId * 2) % 
+                                 (msgType == Async::Tracer::Start ? " START " : " END   ") %
+                                 QString::number(mId) % " " %
+                                 mExecution->executor->mExecutorName);
+}