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diff --git a/src/vm/eventreporter.h b/src/vm/eventreporter.h
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+//
+
+//
+//*****************************************************************************
+// EventReporter.h:
+// A utility to log an entry in event log.
+//*****************************************************************************
+
+
+#ifndef _eventreporter_h_
+#define _eventreporter_h_
+
+#include "contract.h"
+#include "sstring.h"
+
+// Maximum size for a string in event log entry
+#define MAX_SIZE_EVENTLOG_ENTRY_STRING 0x8000 // decimal 32768
+
+// The (approx.) maximum size that Vista appears to allow. Post discussion with the OS event log team,
+// it has been identified that Vista has taken a breaking change in ReportEventW API implementation
+// without getting it publicly documented.
+//
+// An event entry comprises of string to be written and event header information. Prior to Vista,
+// 32K length strings were allowed and event header size was over it. Vista onwards, the total
+// permissible length of the string and event header became 32K, resulting in strings becoming
+// shorter in length. Hence, the change in size.
+#define MAX_SIZE_EVENTLOG_ENTRY_STRING_WINVISTA 0x7C62 // decimal 31842 
+
+class EventReporter
+{
+public:
+    enum EventReporterType
+    {
+        ERT_UnhandledException,
+        ERT_ManagedFailFast,
+        ERT_UnmanagedFailFast,
+        ERT_StackOverflow,
+        ERT_CodeContractFailed,
+    };
+private:
+    EventReporterType m_eventType;
+    // We use 2048 which is large enough for most task.  This allows us to avoid
+    // unnecessary memory allocation.
+    InlineSString<2048> m_Description;
+
+    // Flag to indicate if the buffer is full
+    BOOL fBufferFull;
+
+#ifdef FEATURE_CORECLR
+    static void GetCoreCLRInstanceProductVersion(DWORD * pdwMajor, DWORD * pdwMinor, DWORD * pdwBuild, DWORD * pdwRevision);
+#endif // FEATURE_CORECLR
+
+public:
+    // Construct 
+    EventReporter(EventReporterType type);
+    // Add extra info into description part of the log
+    void AddDescription(__in WCHAR *pString);
+    void AddDescription(SString& s);
+    // Start callstack record
+    void BeginStackTrace();
+    // Add one frame to the callstack part
+    void AddStackTrace(SString& s);
+    // Report to the EventLog
+    void Report();
+};
+
+// return TRUE if we need to log in EventLog.
+BOOL ShouldLogInEventLog();
+// Record managed callstack in EventReporter.
+void LogCallstackForEventReporter(EventReporter& reporter);
+// Generate a report in EventLog for unhandled exception for both managed and unmanaged.
+void DoReportForUnhandledException(PEXCEPTION_POINTERS pExceptionInfo);
+
+#endif // _eventreporter_h_