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diff --git a/lib/xray/xray_basic_logging.h b/lib/xray/xray_basic_logging.h
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+++ b/lib/xray/xray_basic_logging.h
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+//===-- xray_basic_logging.h ----------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of XRay, a function call tracing system.
+//
+//===----------------------------------------------------------------------===//
+#ifndef XRAY_XRAY_INMEMORY_LOG_H
+#define XRAY_XRAY_INMEMORY_LOG_H
+
+#include "xray/xray_log_interface.h"
+
+/// Basic (Naive) Mode
+/// ==================
+///
+/// This implementation hooks in through the XRay logging implementation
+/// framework. The Basic Mode implementation will keep appending to a file as
+/// soon as the thread-local buffers are full. It keeps minimal in-memory state
+/// and does the minimum filtering required to keep log files smaller.
+
+namespace __xray {
+
+XRayLogInitStatus basicLoggingInit(size_t BufferSize, size_t BufferMax,
+                                   void *Options, size_t OptionsSize);
+XRayLogInitStatus basicLoggingFinalize();
+
+void basicLoggingHandleArg0RealTSC(int32_t FuncId, XRayEntryType Entry);
+void basicLoggingHandleArg0EmulateTSC(int32_t FuncId, XRayEntryType Entry);
+void basicLoggingHandleArg1RealTSC(int32_t FuncId, XRayEntryType Entry,
+                                   uint64_t Arg1);
+void basicLoggingHandleArg1EmulateTSC(int32_t FuncId, XRayEntryType Entry,
+                                      uint64_t Arg1);
+XRayLogFlushStatus basicLoggingFlush();
+XRayLogInitStatus basicLoggingReset();
+
+} // namespace __xray
+
+#endif // XRAY_XRAY_INMEMORY_LOG_H