[lldb] [llvm] [lldb]Implement LLDB Telemetry (PR #98528)

[Pavel Labath via llvm-commits]

================
@@ -0,0 +1,273 @@
+
+//===-- Telemetry.cpp -----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#include "lldb/Core/Telemetry.h"
+
+#include <chrono>
+#include <cstdlib>
+#include <ctime>
+#include <fstream>
+#include <memory>
+#include <string>
+#include <typeinfo>
+#include <utility>
+#include <vector>
+
+#include "lldb/API/SBDebugger.h"
+#include "lldb/API/SBProcess.h"
+#include "lldb/Core/Debugger.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/TelemetryVendor.h"
+#include "lldb/Host/FileSystem.h"
+#include "lldb/Host/HostInfo.h"
+#include "lldb/Interpreter/CommandInterpreter.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/Statistics.h"
+#include "lldb/Utility/ConstString.h"
+#include "lldb/Utility/FileSpec.h"
+#include "lldb/Utility/LLDBLog.h"
+#include "lldb/Utility/UUID.h"
+#include "lldb/Version/Version.h"
+#include "lldb/lldb-enumerations.h"
+#include "lldb/lldb-forward.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/JSON.h"
+#include "llvm/Support/LineIterator.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/RandomNumberGenerator.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Telemetry/Telemetry.h"
+
+namespace lldb_private {
+
+using ::llvm::telemetry::Destination;
+using ::llvm::telemetry::EventStats;
+using ::llvm::telemetry::ExitDescription;
+using ::llvm::telemetry::SteadyTimePoint;
+using ::llvm::telemetry::TelemetryInfo;
+
+static std::string
+ExitDescToString(const llvm::telemetry::ExitDescription *desc) {
+  return ("ExitCode:" + desc->ExitCode) +
+         (" ExixitDescription: " + desc->Description);
+}
+
+static std::string GetDuration(const EventStats &stats) {
+  if (stats.End.has_value())
+    return std::to_string((stats.End.value() - stats.Start).count()) +
+           "(nanosec)";
----------------
labath wrote:

```suggestion
    return llvm::formatv("{0:ns}", stats.End.value() - stats.Start).str();
```

(or maybe some other unit (ms/us) -- how small do we expect these to get)?

https://github.com/llvm/llvm-project/pull/98528