Extend the trace event API with instant events

As a preparetion for further work, refactor ProfileZone into a base
class TraceEvent and a derived class ProfileZone.

Change-Id: I3a93c79f46ffc5768ddaf338789fe2daa225ef4d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/114776
Tested-by: Tor Lillqvist <tml@collabora.com>
Reviewed-by: Tor Lillqvist <tml@collabora.com>

1 files changed, 125 insertions, 0 deletions

diff --git a/comphelper/source/misc/traceevent.cxx b/comphelper/source/misc/traceevent.cxx
new file mode 100644
index 000000000000..b1313271f89b
--- /dev/null
+++ b/comphelper/source/misc/traceevent.cxx
@@ -0,0 +1,125 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <sal/config.h>
+
+#include <atomic>
+#include <iostream>
+#include <string_view>
+
+#include <comphelper/profilezone.hxx>
+#include <comphelper/sequence.hxx>
+#include <comphelper/traceevent.hxx>
+
+#include <osl/time.h>
+#include <osl/thread.h>
+
+namespace comphelper
+{
+std::atomic<bool> TraceEvent::s_bRecording = false;
+
+int TraceEvent::s_nNesting = 0; // level of overlapped zones
+
+namespace
+{
+std::vector<OUString> g_aRecording; // recorded data
+::osl::Mutex g_aMutex;
+}
+
+void TraceEvent::addRecording(const OUString& sObject)
+{
+    ::osl::MutexGuard aGuard(g_aMutex);
+
+    g_aRecording.emplace_back(sObject);
+}
+
+void TraceEvent::addInstantEvent(const char* sProfileId)
+{
+    TimeValue aSystemTime;
+    osl_getSystemTime(&aSystemTime);
+    long long nNow
+        = static_cast<long long>(aSystemTime.Seconds) * 1000000 + aSystemTime.Nanosec / 1000;
+
+    int nPid = 0;
+    oslProcessInfo aProcessInfo;
+    aProcessInfo.Size = sizeof(oslProcessInfo);
+    if (osl_getProcessInfo(nullptr, osl_Process_IDENTIFIER, &aProcessInfo) == osl_Process_E_None)
+        nPid = aProcessInfo.Ident;
+
+    addRecording("{"
+                 "\"name:\""
+                 + OUString(sProfileId, strlen(sProfileId), RTL_TEXTENCODING_UTF8)
+                 + "\","
+                   "\"ph\":\"i\","
+                   "\"ts\":"
+                 + OUString::number(nNow)
+                 + ","
+                   "\"pid\":"
+                 + OUString::number(nPid)
+                 + ","
+                   "\"tid\":"
+                 + OUString::number(osl_getThreadIdentifier(nullptr)) + "},");
+}
+
+void ProfileZone::startRecording()
+{
+    ::osl::MutexGuard aGuard(g_aMutex);
+    s_nNesting = 0;
+    s_bRecording = true;
+}
+
+void ProfileZone::stopRecording() { s_bRecording = false; }
+
+void ProfileZone::addRecording()
+{
+    assert(s_bRecording);
+
+    TimeValue aSystemTime;
+    osl_getSystemTime(&aSystemTime);
+    long long nNow
+        = static_cast<long long>(aSystemTime.Seconds) * 1000000 + aSystemTime.Nanosec / 1000;
+
+    // Generate a single "Complete Event" (type X)
+    TraceEvent::addRecording("{"
+                             "\"name\":\""
+                             + OUString(m_sProfileId, strlen(m_sProfileId), RTL_TEXTENCODING_UTF8)
+                             + "\","
+                               "\"ph\":\"X\","
+                               "\"ts\":"
+                             + OUString::number(m_nCreateTime)
+                             + ","
+                               "\"dur\":"
+                             + OUString::number(nNow - m_nCreateTime)
+                             + ","
+                               "\"pid\":"
+                             + OUString::number(m_nPid)
+                             + ","
+                               "\"tid\":"
+                             + OUString::number(osl_getThreadIdentifier(nullptr)) + "},");
+}
+
+css::uno::Sequence<OUString> ProfileZone::getRecordingAndClear()
+{
+    bool bRecording;
+    std::vector<OUString> aRecording;
+    {
+        ::osl::MutexGuard aGuard(g_aMutex);
+        bRecording = s_bRecording;
+        stopRecording();
+        aRecording.swap(g_aRecording);
+    }
+    // reset start time and nesting level
+    if (bRecording)
+        startRecording();
+    return ::comphelper::containerToSequence(aRecording);
+}
+
+} // namespace comphelper
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */