--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/os/windows/vm/windbghelp.hpp	Fri Aug 18 09:05:42 2017 +0200
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef OS_WINDOWS_VM_DBGHELPLOADER_HPP
+#define OS_WINDOWS_VM_DBGHELPLOADER_HPP
+
+#include <windows.h>
+#include <imagehlp.h>
+
+// This is a very plain wrapper for loading dbghelp.dll. It does not offer
+//  any additional functionality. It takes care of locking.
+
+class outputStream;
+
+// Please note: dbghelp.dll may not have been loaded, or it may have been loaded but not
+//  all functions may be available (because on the target system dbghelp.dll is of an
+//  older version).
+// In all these cases we return an error from the WindowsDbgHelp::symXXXX() wrapper. We never
+//  assert. It should always be safe to call these functions, but caller has to process the
+//  return code (which he would have to do anyway).
+namespace WindowsDbgHelp {
+
+  DWORD symSetOptions(DWORD);
+  DWORD symGetOptions(void);
+  BOOL symInitialize(HANDLE, PCTSTR, BOOL);
+  BOOL symGetSymFromAddr64(HANDLE, DWORD64, PDWORD64, PIMAGEHLP_SYMBOL64);
+  DWORD unDecorateSymbolName(const char*, char*, DWORD, DWORD);
+  BOOL symSetSearchPath(HANDLE, PCTSTR);
+  BOOL symGetSearchPath(HANDLE, PTSTR, int);
+  BOOL stackWalk64(DWORD MachineType,
+                   HANDLE hProcess,
+                   HANDLE hThread,
+                   LPSTACKFRAME64 StackFrame,
+                   PVOID ContextRecord);
+  PVOID symFunctionTableAccess64(HANDLE hProcess, DWORD64 AddrBase);
+  DWORD64 symGetModuleBase64(HANDLE hProcess, DWORD64 dwAddr);
+  BOOL miniDumpWriteDump(HANDLE hProcess, DWORD ProcessId, HANDLE hFile,
+                         MINIDUMP_TYPE DumpType, PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam,
+                         PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam,
+                         PMINIDUMP_CALLBACK_INFORMATION CallbackParam);
+  BOOL symGetLineFromAddr64 (HANDLE hProcess, DWORD64 dwAddr,
+                             PDWORD pdwDisplacement, PIMAGEHLP_LINE64 Line);
+
+  // Print one liner describing state (if library loaded, which functions are
+  // missing - if any, and the dbhelp API version)
+  void print_state_on(outputStream* st);
+
+};
+
+
+#endif // OS_WINDOWS_VM_DBGHELPLOADER_HPP
+