stackwalker for better log on exception on windows

4 files changed, 1873 insertions, 8 deletions

diff --git a/src/slic3r/CMakeLists.txt b/src/slic3r/CMakeLists.txt
index 4ab55390b..f71b809b3 100644
--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -290,6 +290,13 @@ if (APPLE)
     FIND_LIBRARY(DISKARBITRATION_LIBRARY DiskArbitration)
 endif ()
 
+if (MSVC)
+    list(APPEND SLIC3R_GUI_SOURCES
+            StackWalker.cpp
+            StackWalker.h
+        )
+endif ()
+
 add_library(libslic3r_gui STATIC ${SLIC3R_GUI_SOURCES})
 target_compile_definitions(libslic3r_gui PRIVATE $<$<BOOL:${SLIC3R_ALPHA}>:SLIC3R_ALPHA>)
 
diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.cpp b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
index 9135e4005..8f430c4ee 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.cpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
@@ -38,6 +38,11 @@
 
 #include "slic3r/GUI/Plater.hpp"
 
+#ifdef WIN32
+#include <windows.h>
+#include "../StackWalker.h"
+#endif
+
 namespace Slic3r {
 
 bool SlicingProcessCompletedEvent::critical_error() const
@@ -77,14 +82,21 @@ std::pair<std::string, bool> SlicingProcessCompletedEvent::format_error_message(
 	try {
 		this->rethrow_exception();
     } catch (const std::bad_alloc& ex) {
-        wxString errmsg = GUI::from_u8((boost::format(_utf8(L("%s has encountered an error. It was likely caused by running out of memory. "
+        std::string errmsg = GUI::format(_u8L("%1% has encountered an error. It was likely caused by running out of memory. "
                               "If you are sure you have enough RAM on your system, this may also be a bug and we would "
-                              "be glad if you reported it."))) % SLIC3R_APP_NAME).str());
-        error = std::string(errmsg.ToUTF8()) + "\n\n" + std::string(ex.what());
+                              "be glad if you reported it."), SLIC3R_APP_NAME);
+        error = errmsg + "\n\n" + std::string(ex.what());
+#ifdef WIN32
+        error += " \nPlease join the 'crash_log.txt' file (if it exists) content to your report.";
+#endif
     } catch (const HardCrash &ex) {
-        error = GUI::format(_L("PrusaSlicer has encountered a fatal error: \"%1%\""), ex.what()) + "\n\n" +
-        		_u8L("Please save your project and restart PrusaSlicer. "
-                     "We would be glad if you reported the issue.");
+        error = GUI::format(_L("%1% has encountered a fatal error: \"%2%\""), SLIC3R_APP_NAME, ex.what())
+                + "\n\n"
+                + GUI::format(_u8L("Please save your project and restart %1%. "
+                     "We would be glad if you reported the issue."), SLIC3R_APP_NAME);
+#ifdef WIN32
+        error += " \nPlease join the 'crash_log.txt' file (if it exists) content to your report.";
+#endif
     } catch (PlaceholderParserError &ex) {
 		error = ex.what();
 		monospace = true;
@@ -289,8 +301,10 @@ static void rethrow_seh_exception(unsigned long win32_seh_catched)
 {
 	if (win32_seh_catched) {
 		// Rethrow SEH exception as Slicer::HardCrash.
-		if (win32_seh_catched == STATUS_ACCESS_VIOLATION || win32_seh_catched == STATUS_DATATYPE_MISALIGNMENT)
-			throw Slic3r::HardCrash(_u8L("Access violation"));
+		if (win32_seh_catched == STATUS_ACCESS_VIOLATION)
+			throw Slic3r::HardCrash(_u8L("Access (status) violation"));
+		if (win32_seh_catched == STATUS_DATATYPE_MISALIGNMENT)
+			throw Slic3r::HardCrash(_u8L("Access violation (misalignement)"));
 		if (win32_seh_catched == STATUS_ILLEGAL_INSTRUCTION || win32_seh_catched == STATUS_PRIVILEGED_INSTRUCTION)
 			throw Slic3r::HardCrash(_u8L("Illegal instruction"));
 		if (win32_seh_catched == STATUS_FLOAT_DIVIDE_BY_ZERO || win32_seh_catched == STATUS_INTEGER_DIVIDE_BY_ZERO)
@@ -331,6 +345,16 @@ void BackgroundSlicingProcess::call_process_seh_throw(std::exception_ptr &ex) th
 		}
 	}
 }
+
+class StackWalker2 : public StackWalker {
+public:
+    StackWalker2(ExceptType extype) : StackWalker(extype) {}
+    std::string output;
+    void OnOutput(LPCSTR szText) override {
+        output += szText; //this will collect stack info in output string
+    }
+};
+
 #endif // _WIN32
 
 void BackgroundSlicingProcess::call_process(std::exception_ptr &ex) throw()
@@ -347,6 +371,19 @@ void BackgroundSlicingProcess::call_process(std::exception_ptr &ex) throw()
 		assert(m_print->canceled());
 		ex = std::current_exception();
 	} catch (...) {
+#ifdef _WIN32
+		StackWalker2 sw(StackWalker::AfterCatch);
+		sw.ShowCallstack();
+		BOOST_LOG_TRIVIAL(error) << "EXCEPTION during the print->process():" << sw.output;
+		// also wrote it on disk
+		try {
+			std::ofstream myfile;
+			myfile.open("crash_log.txt", std::ofstream::out | std::ofstream::app);
+			myfile << "\nEXCEPTION during the print->process():\n";
+			myfile << sw.output << "\n";
+			myfile.close();
+		} catch (...) {}
+#endif // _WIN32
 		ex = std::current_exception();
 	}
 }
diff --git a/src/slic3r/StackWalker.cpp b/src/slic3r/StackWalker.cpp
new file mode 100644
index 000000000..89545f861
--- /dev/null
+++ b/src/slic3r/StackWalker.cpp
@@ -0,0 +1,1548 @@
+/**********************************************************************
+ *
+ * StackWalker.cpp
+ * https://github.com/JochenKalmbach/StackWalker
+ *
+ * Old location: http://stackwalker.codeplex.com/
+ *
+ *
+ * History:
+ *  2005-07-27   v1    - First public release on http://www.codeproject.com/
+ *                       http://www.codeproject.com/threads/StackWalker.asp
+ *  2005-07-28   v2    - Changed the params of the constructor and ShowCallstack
+ *                       (to simplify the usage)
+ *  2005-08-01   v3    - Changed to use 'CONTEXT_FULL' instead of CONTEXT_ALL
+ *                       (should also be enough)
+ *                     - Changed to compile correctly with the PSDK of VC7.0
+ *                       (GetFileVersionInfoSizeA and GetFileVersionInfoA is wrongly defined:
+ *                        it uses LPSTR instead of LPCSTR as first parameter)
+ *                     - Added declarations to support VC5/6 without using 'dbghelp.h'
+ *                     - Added a 'pUserData' member to the ShowCallstack function and the
+ *                       PReadProcessMemoryRoutine declaration (to pass some user-defined data,
+ *                       which can be used in the readMemoryFunction-callback)
+ *  2005-08-02   v4    - OnSymInit now also outputs the OS-Version by default
+ *                     - Added example for doing an exception-callstack-walking in main.cpp
+ *                       (thanks to owillebo: http://www.codeproject.com/script/profile/whos_who.asp?id=536268)
+ *  2005-08-05   v5    - Removed most Lint (http://www.gimpel.com/) errors... thanks to Okko Willeboordse!
+ *  2008-08-04   v6    - Fixed Bug: Missing LEAK-end-tag
+ *                       http://www.codeproject.com/KB/applications/leakfinder.aspx?msg=2502890#xx2502890xx
+ *                       Fixed Bug: Compiled with "WIN32_LEAN_AND_MEAN"
+ *                       http://www.codeproject.com/KB/applications/leakfinder.aspx?msg=1824718#xx1824718xx
+ *                       Fixed Bug: Compiling with "/Wall"
+ *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=2638243#xx2638243xx
+ *                       Fixed Bug: Now checking SymUseSymSrv
+ *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=1388979#xx1388979xx
+ *                       Fixed Bug: Support for recursive function calls
+ *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=1434538#xx1434538xx
+ *                       Fixed Bug: Missing FreeLibrary call in "GetModuleListTH32"
+ *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=1326923#xx1326923xx
+ *                       Fixed Bug: SymDia is number 7, not 9!
+ *  2008-09-11   v7      For some (undocumented) reason, dbhelp.h is needing a packing of 8!
+ *                       Thanks to Teajay which reported the bug...
+ *                       http://www.codeproject.com/KB/applications/leakfinder.aspx?msg=2718933#xx2718933xx
+ *  2008-11-27   v8      Debugging Tools for Windows are now stored in a different directory
+ *                       Thanks to Luiz Salamon which reported this "bug"...
+ *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=2822736#xx2822736xx
+ *  2009-04-10   v9      License slightly corrected (<ORGANIZATION> replaced)
+ *  2009-11-01   v10     Moved to http://stackwalker.codeplex.com/
+ *  2009-11-02   v11     Now try to use IMAGEHLP_MODULE64_V3 if available
+ *  2010-04-15   v12     Added support for VS2010 RTM
+ *  2010-05-25   v13     Now using secure MyStrcCpy. Thanks to luke.simon:
+ *                       http://www.codeproject.com/KB/applications/leakfinder.aspx?msg=3477467#xx3477467xx
+ *  2013-01-07   v14     Runtime Check Error VS2010 Debug Builds fixed:
+ *                       http://stackwalker.codeplex.com/workitem/10511
+ *
+ *
+ * LICENSE (http://www.opensource.org/licenses/bsd-license.php)
+ *
+ *   Copyright (c) 2005-2013, Jochen Kalmbach
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without modification,
+ *   are permitted provided that the following conditions are met:
+ *
+ *   Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *   Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *   Neither the name of Jochen Kalmbach nor the names of its contributors may be
+ *   used to endorse or promote products derived from this software without
+ *   specific prior written permission.
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ *   THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ *   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ *   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ **********************************************************************/
+
+#include "StackWalker.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <tchar.h>
+#include <windows.h>
+#include <new>
+
+#pragma comment(lib, "version.lib") // for "VerQueryValue"
+
+#pragma warning(disable : 4826)
+#if _MSC_VER >= 1900
+#pragma warning(disable : 4091)   // For fix unnamed enums from DbgHelp.h
+#endif
+
+
+// If VC7 and later, then use the shipped 'dbghelp.h'-file
+#pragma pack(push, 8)
+#if _MSC_VER >= 1300
+#include <dbghelp.h>
+#else
+// inline the important dbghelp.h-declarations...
+typedef enum
+{
+  SymNone = 0,
+  SymCoff,
+  SymCv,
+  SymPdb,
+  SymExport,
+  SymDeferred,
+  SymSym,
+  SymDia,
+  SymVirtual,
+  NumSymTypes
+} SYM_TYPE;
+typedef struct _IMAGEHLP_LINE64
+{
+  DWORD   SizeOfStruct; // set to sizeof(IMAGEHLP_LINE64)
+  PVOID   Key;          // internal
+  DWORD   LineNumber;   // line number in file
+  PCHAR   FileName;     // full filename
+  DWORD64 Address;      // first instruction of line
+} IMAGEHLP_LINE64, *PIMAGEHLP_LINE64;
+typedef struct _IMAGEHLP_MODULE64
+{
+  DWORD    SizeOfStruct;         // set to sizeof(IMAGEHLP_MODULE64)
+  DWORD64  BaseOfImage;          // base load address of module
+  DWORD    ImageSize;            // virtual size of the loaded module
+  DWORD    TimeDateStamp;        // date/time stamp from pe header
+  DWORD    CheckSum;             // checksum from the pe header
+  DWORD    NumSyms;              // number of symbols in the symbol table
+  SYM_TYPE SymType;              // type of symbols loaded
+  CHAR     ModuleName[32];       // module name
+  CHAR     ImageName[256];       // image name
+  CHAR     LoadedImageName[256]; // symbol file name
+} IMAGEHLP_MODULE64, *PIMAGEHLP_MODULE64;
+typedef struct _IMAGEHLP_SYMBOL64
+{
+  DWORD   SizeOfStruct;  // set to sizeof(IMAGEHLP_SYMBOL64)
+  DWORD64 Address;       // virtual address including dll base address
+  DWORD   Size;          // estimated size of symbol, can be zero
+  DWORD   Flags;         // info about the symbols, see the SYMF defines
+  DWORD   MaxNameLength; // maximum size of symbol name in 'Name'
+  CHAR    Name[1];       // symbol name (null terminated string)
+} IMAGEHLP_SYMBOL64, *PIMAGEHLP_SYMBOL64;
+typedef enum
+{
+  AddrMode1616,
+  AddrMode1632,
+  AddrModeReal,
+  AddrModeFlat
+} ADDRESS_MODE;
+typedef struct _tagADDRESS64
+{
+  DWORD64      Offset;
+  WORD         Segment;
+  ADDRESS_MODE Mode;
+} ADDRESS64, *LPADDRESS64;
+typedef struct _KDHELP64
+{
+  DWORD64 Thread;
+  DWORD   ThCallbackStack;
+  DWORD   ThCallbackBStore;
+  DWORD   NextCallback;
+  DWORD   FramePointer;
+  DWORD64 KiCallUserMode;
+  DWORD64 KeUserCallbackDispatcher;
+  DWORD64 SystemRangeStart;
+  DWORD64 Reserved[8];
+} KDHELP64, *PKDHELP64;
+typedef struct _tagSTACKFRAME64
+{
+  ADDRESS64 AddrPC;         // program counter
+  ADDRESS64 AddrReturn;     // return address
+  ADDRESS64 AddrFrame;      // frame pointer
+  ADDRESS64 AddrStack;      // stack pointer
+  ADDRESS64 AddrBStore;     // backing store pointer
+  PVOID     FuncTableEntry; // pointer to pdata/fpo or NULL
+  DWORD64   Params[4];      // possible arguments to the function
+  BOOL      Far;            // WOW far call
+  BOOL      Virtual;        // is this a virtual frame?
+  DWORD64   Reserved[3];
+  KDHELP64  KdHelp;
+} STACKFRAME64, *LPSTACKFRAME64;
+typedef BOOL(__stdcall* PREAD_PROCESS_MEMORY_ROUTINE64)(HANDLE  hProcess,
+                                                        DWORD64 qwBaseAddress,
+                                                        PVOID   lpBuffer,
+                                                        DWORD   nSize,
+                                                        LPDWORD lpNumberOfBytesRead);
+typedef PVOID(__stdcall* PFUNCTION_TABLE_ACCESS_ROUTINE64)(HANDLE hProcess, DWORD64 AddrBase);
+typedef DWORD64(__stdcall* PGET_MODULE_BASE_ROUTINE64)(HANDLE hProcess, DWORD64 Address);
+typedef DWORD64(__stdcall* PTRANSLATE_ADDRESS_ROUTINE64)(HANDLE      hProcess,
+                                                         HANDLE      hThread,
+                                                         LPADDRESS64 lpaddr);
+
+// clang-format off
+#define SYMOPT_CASE_INSENSITIVE         0x00000001
+#define SYMOPT_UNDNAME                  0x00000002
+#define SYMOPT_DEFERRED_LOADS           0x00000004
+#define SYMOPT_NO_CPP                   0x00000008
+#define SYMOPT_LOAD_LINES               0x00000010
+#define SYMOPT_OMAP_FIND_NEAREST        0x00000020
+#define SYMOPT_LOAD_ANYTHING            0x00000040
+#define SYMOPT_IGNORE_CVREC             0x00000080
+#define SYMOPT_NO_UNQUALIFIED_LOADS     0x00000100
+#define SYMOPT_FAIL_CRITICAL_ERRORS     0x00000200
+#define SYMOPT_EXACT_SYMBOLS            0x00000400
+#define SYMOPT_ALLOW_ABSOLUTE_SYMBOLS   0x00000800
+#define SYMOPT_IGNORE_NT_SYMPATH        0x00001000
+#define SYMOPT_INCLUDE_32BIT_MODULES    0x00002000
+#define SYMOPT_PUBLICS_ONLY             0x00004000
+#define SYMOPT_NO_PUBLICS               0x00008000
+#define SYMOPT_AUTO_PUBLICS             0x00010000
+#define SYMOPT_NO_IMAGE_SEARCH          0x00020000
+#define SYMOPT_SECURE                   0x00040000
+#define SYMOPT_DEBUG                    0x80000000
+#define UNDNAME_COMPLETE                 (0x0000) // Enable full undecoration
+#define UNDNAME_NAME_ONLY                (0x1000) // Crack only the name for primary declaration;
+// clang-format on
+
+#endif // _MSC_VER < 1300
+#pragma pack(pop)
+
+// Some missing defines (for VC5/6):
+#ifndef INVALID_FILE_ATTRIBUTES
+#define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
+#endif
+
+// secure-CRT_functions are only available starting with VC8
+#if _MSC_VER < 1400
+#define strcpy_s(dst, len, src) strcpy(dst, src)
+#define strncpy_s(dst, len, src, maxLen) strncpy(dst, len, src)
+#define strcat_s(dst, len, src) strcat(dst, src)
+#define _snprintf_s _snprintf
+#define _tcscat_s _tcscat
+#endif
+
+static void MyStrCpy(char* szDest, size_t nMaxDestSize, const char* szSrc)
+{
+  if (nMaxDestSize <= 0)
+    return;
+  strncpy_s(szDest, nMaxDestSize, szSrc, _TRUNCATE);
+  // INFO: _TRUNCATE will ensure that it is null-terminated;
+  // but with older compilers (<1400) it uses "strncpy" and this does not!)
+  szDest[nMaxDestSize - 1] = 0;
+} // MyStrCpy
+
+// Normally it should be enough to use 'CONTEXT_FULL' (better would be 'CONTEXT_ALL')
+#define USED_CONTEXT_FLAGS CONTEXT_FULL
+
+class StackWalkerInternal
+{
+public:
+  StackWalkerInternal(StackWalker* parent, HANDLE hProcess, PCONTEXT ctx)
+  {
+    m_parent = parent;
+    m_hDbhHelp = NULL;
+    pSC = NULL;
+    m_hProcess = hProcess;
+    pSFTA = NULL;
+    pSGLFA = NULL;
+    pSGMB = NULL;
+    pSGMI = NULL;
+    pSGO = NULL;
+    pSGSFA = NULL;
+    pSI = NULL;
+    pSLM = NULL;
+    pSSO = NULL;
+    pSW = NULL;
+    pUDSN = NULL;
+    pSGSP = NULL;
+    m_ctx.ContextFlags = 0;
+    if (ctx != NULL)
+      m_ctx = *ctx;
+  }
+
+  ~StackWalkerInternal()
+  {
+    if (pSC != NULL)
+      pSC(m_hProcess); // SymCleanup
+    if (m_hDbhHelp != NULL)
+      FreeLibrary(m_hDbhHelp);
+    m_hDbhHelp = NULL;
+    m_parent = NULL;
+  }
+
+  BOOL Init(LPCSTR szSymPath)
+  {
+    if (m_parent == NULL)
+      return FALSE;
+    // Dynamically load the Entry-Points for dbghelp.dll:
+    // First try to load the newest one from
+    TCHAR szTemp[4096];
+    // But before we do this, we first check if the ".local" file exists
+    if (GetModuleFileName(NULL, szTemp, 4096) > 0)
+    {
+      _tcscat_s(szTemp, _T(".local"));
+      if (GetFileAttributes(szTemp) == INVALID_FILE_ATTRIBUTES)
+      {
+        // ".local" file does not exist, so we can try to load the dbghelp.dll from the "Debugging Tools for Windows"
+        // Ok, first try the new path according to the architecture:
+#ifdef _M_IX86
+        if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
+        {
+          _tcscat_s(szTemp, _T("\\Debugging Tools for Windows (x86)\\dbghelp.dll"));
+          // now check if the file exists:
+          if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
+          {
+            m_hDbhHelp = LoadLibrary(szTemp);
+          }
+        }
+#elif _M_X64
+        if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
+        {
+          _tcscat_s(szTemp, _T("\\Debugging Tools for Windows (x64)\\dbghelp.dll"));
+          // now check if the file exists:
+          if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
+          {
+            m_hDbhHelp = LoadLibrary(szTemp);
+          }
+        }
+#elif _M_IA64
+        if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
+        {
+          _tcscat_s(szTemp, _T("\\Debugging Tools for Windows (ia64)\\dbghelp.dll"));
+          // now check if the file exists:
+          if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
+          {
+            m_hDbhHelp = LoadLibrary(szTemp);
+          }
+        }
+#endif
+        // If still not found, try the old directories...
+        if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
+        {
+          _tcscat_s(szTemp, _T("\\Debugging Tools for Windows\\dbghelp.dll"));
+          // now check if the file exists:
+          if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
+          {
+            m_hDbhHelp = LoadLibrary(szTemp);
+          }
+        }
+#if defined _M_X64 || defined _M_IA64
+        // Still not found? Then try to load the (old) 64-Bit version:
+        if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
+        {
+          _tcscat_s(szTemp, _T("\\Debugging Tools for Windows 64-Bit\\dbghelp.dll"));
+          if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
+          {
+            m_hDbhHelp = LoadLibrary(szTemp);
+          }
+        }
+#endif
+      }
+    }
+    if (m_hDbhHelp == NULL) // if not already loaded, try to load a default-one
+      m_hDbhHelp = LoadLibrary(_T("dbghelp.dll"));
+    if (m_hDbhHelp == NULL)
+      return FALSE;
+    pSI = (tSI)GetProcAddress(m_hDbhHelp, "SymInitialize");
+    pSC = (tSC)GetProcAddress(m_hDbhHelp, "SymCleanup");
+
+    pSW = (tSW)GetProcAddress(m_hDbhHelp, "StackWalk64");
+    pSGO = (tSGO)GetProcAddress(m_hDbhHelp, "SymGetOptions");
+    pSSO = (tSSO)GetProcAddress(m_hDbhHelp, "SymSetOptions");
+
+    pSFTA = (tSFTA)GetProcAddress(m_hDbhHelp, "SymFunctionTableAccess64");
+    pSGLFA = (tSGLFA)GetProcAddress(m_hDbhHelp, "SymGetLineFromAddr64");
+    pSGMB = (tSGMB)GetProcAddress(m_hDbhHelp, "SymGetModuleBase64");
+    pSGMI = (tSGMI)GetProcAddress(m_hDbhHelp, "SymGetModuleInfo64");
+    pSGSFA = (tSGSFA)GetProcAddress(m_hDbhHelp, "SymGetSymFromAddr64");
+    pUDSN = (tUDSN)GetProcAddress(m_hDbhHelp, "UnDecorateSymbolName");
+    pSLM = (tSLM)GetProcAddress(m_hDbhHelp, "SymLoadModule64");
+    pSGSP = (tSGSP)GetProcAddress(m_hDbhHelp, "SymGetSearchPath");
+
+    if (pSC == NULL || pSFTA == NULL || pSGMB == NULL || pSGMI == NULL || pSGO == NULL ||
+        pSGSFA == NULL || pSI == NULL || pSSO == NULL || pSW == NULL || pUDSN == NULL ||
+        pSLM == NULL)
+    {
+      FreeLibrary(m_hDbhHelp);
+      m_hDbhHelp = NULL;
+      pSC = NULL;
+      return FALSE;
+    }
+
+    // SymInitialize
+    if (this->pSI(m_hProcess, szSymPath, FALSE) == FALSE)
+      this->m_parent->OnDbgHelpErr("SymInitialize", GetLastError(), 0);
+
+    DWORD symOptions = this->pSGO(); // SymGetOptions
+    symOptions |= SYMOPT_LOAD_LINES;
+    symOptions |= SYMOPT_FAIL_CRITICAL_ERRORS;
+    //symOptions |= SYMOPT_NO_PROMPTS;
+    // SymSetOptions
+    symOptions = this->pSSO(symOptions);
+
+    char buf[StackWalker::STACKWALK_MAX_NAMELEN] = {0};
+    if (this->pSGSP != NULL)
+    {
+      if (this->pSGSP(m_hProcess, buf, StackWalker::STACKWALK_MAX_NAMELEN) == FALSE)
+        this->m_parent->OnDbgHelpErr("SymGetSearchPath", GetLastError(), 0);
+    }
+    char  szUserName[1024] = {0};
+    DWORD dwSize = 1024;
+    GetUserNameA(szUserName, &dwSize);
+    this->m_parent->OnSymInit(buf, symOptions, szUserName);
+
+    return TRUE;
+  }
+
+  StackWalker* m_parent;
+
+  CONTEXT m_ctx;
+  HMODULE m_hDbhHelp;
+  HANDLE  m_hProcess;
+
+#pragma pack(push, 8)
+  typedef struct _IMAGEHLP_MODULE64_V3
+  {
+    DWORD    SizeOfStruct;         // set to sizeof(IMAGEHLP_MODULE64)
+    DWORD64  BaseOfImage;          // base load address of module
+    DWORD    ImageSize;            // virtual size of the loaded module
+    DWORD    TimeDateStamp;        // date/time stamp from pe header
+    DWORD    CheckSum;             // checksum from the pe header
+    DWORD    NumSyms;              // number of symbols in the symbol table
+    SYM_TYPE SymType;              // type of symbols loaded
+    CHAR     ModuleName[32];       // module name
+    CHAR     ImageName[256];       // image name
+    CHAR     LoadedImageName[256]; // symbol file name
+    // new elements: 07-Jun-2002
+    CHAR  LoadedPdbName[256];   // pdb file name
+    DWORD CVSig;                // Signature of the CV record in the debug directories
+    CHAR  CVData[MAX_PATH * 3]; // Contents of the CV record
+    DWORD PdbSig;               // Signature of PDB
+    GUID  PdbSig70;             // Signature of PDB (VC 7 and up)
+    DWORD PdbAge;               // DBI age of pdb
+    BOOL  PdbUnmatched;         // loaded an unmatched pdb
+    BOOL  DbgUnmatched;         // loaded an unmatched dbg
+    BOOL  LineNumbers;          // we have line number information
+    BOOL  GlobalSymbols;        // we have internal symbol information
+    BOOL  TypeInfo;             // we have type information
+    // new elements: 17-Dec-2003
+    BOOL SourceIndexed; // pdb supports source server
+    BOOL Publics;       // contains public symbols
+  } IMAGEHLP_MODULE64_V3, *PIMAGEHLP_MODULE64_V3;
+
+  typedef struct _IMAGEHLP_MODULE64_V2
+  {
+    DWORD    SizeOfStruct;         // set to sizeof(IMAGEHLP_MODULE64)
+    DWORD64  BaseOfImage;          // base load address of module
+    DWORD    ImageSize;            // virtual size of the loaded module
+    DWORD    TimeDateStamp;        // date/time stamp from pe header
+    DWORD    CheckSum;             // checksum from the pe header
+    DWORD    NumSyms;              // number of symbols in the symbol table
+    SYM_TYPE SymType;              // type of symbols loaded
+    CHAR     ModuleName[32];       // module name
+    CHAR     ImageName[256];       // image name
+    CHAR     LoadedImageName[256]; // symbol file name
+  } IMAGEHLP_MODULE64_V2, *PIMAGEHLP_MODULE64_V2;
+#pragma pack(pop)
+
+  // SymCleanup()
+  typedef BOOL(__stdcall* tSC)(IN HANDLE hProcess);
+  tSC pSC;
+
+  // SymFunctionTableAccess64()
+  typedef PVOID(__stdcall* tSFTA)(HANDLE hProcess, DWORD64 AddrBase);
+  tSFTA pSFTA;
+
+  // SymGetLineFromAddr64()
+  typedef BOOL(__stdcall* tSGLFA)(IN HANDLE hProcess,
+                                  IN DWORD64 dwAddr,
+                                  OUT PDWORD pdwDisplacement,
+                                  OUT PIMAGEHLP_LINE64 Line);
+  tSGLFA pSGLFA;
+
+  // SymGetModuleBase64()
+  typedef DWORD64(__stdcall* tSGMB)(IN HANDLE hProcess, IN DWORD64 dwAddr);
+  tSGMB pSGMB;
+
+  // SymGetModuleInfo64()
+  typedef BOOL(__stdcall* tSGMI)(IN HANDLE hProcess,
+                                 IN DWORD64 dwAddr,
+                                 OUT IMAGEHLP_MODULE64_V3* ModuleInfo);
+  tSGMI pSGMI;
+
+  // SymGetOptions()
+  typedef DWORD(__stdcall* tSGO)(VOID);
+  tSGO pSGO;
+
+  // SymGetSymFromAddr64()
+  typedef BOOL(__stdcall* tSGSFA)(IN HANDLE hProcess,
+                                  IN DWORD64 dwAddr,
+                                  OUT PDWORD64 pdwDisplacement,
+                                  OUT PIMAGEHLP_SYMBOL64 Symbol);
+  tSGSFA pSGSFA;
+
+  // SymInitialize()
+  typedef BOOL(__stdcall* tSI)(IN HANDLE hProcess, IN LPCSTR UserSearchPath, IN BOOL fInvadeProcess);
+  tSI pSI;
+
+  // SymLoadModule64()
+  typedef DWORD64(__stdcall* tSLM)(IN HANDLE hProcess,
+                                   IN HANDLE hFile,
+                                   IN LPCSTR ImageName,
+                                   IN LPCSTR ModuleName,
+                                   IN DWORD64 BaseOfDll,
+                                   IN DWORD SizeOfDll);
+  tSLM pSLM;
+
+  // SymSetOptions()
+  typedef DWORD(__stdcall* tSSO)(IN DWORD SymOptions);
+  tSSO pSSO;
+
+  // StackWalk64()
+  typedef BOOL(__stdcall* tSW)(DWORD                            MachineType,
+                               HANDLE                           hProcess,
+                               HANDLE                           hThread,
+                               LPSTACKFRAME64                   StackFrame,
+                               PVOID                            ContextRecord,
+                               PREAD_PROCESS_MEMORY_ROUTINE64   ReadMemoryRoutine,
+                               PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
+                               PGET_MODULE_BASE_ROUTINE64       GetModuleBaseRoutine,
+                               PTRANSLATE_ADDRESS_ROUTINE64     TranslateAddress);
+  tSW pSW;
+
+  // UnDecorateSymbolName()
+  typedef DWORD(__stdcall WINAPI* tUDSN)(PCSTR DecoratedName,
+                                         PSTR  UnDecoratedName,
+                                         DWORD UndecoratedLength,
+                                         DWORD Flags);
+  tUDSN pUDSN;
+
+  typedef BOOL(__stdcall WINAPI* tSGSP)(HANDLE hProcess, PSTR SearchPath, DWORD SearchPathLength);
+  tSGSP pSGSP;
+
+private:
+// **************************************** ToolHelp32 ************************
+#define MAX_MODULE_NAME32 255
+#define TH32CS_SNAPMODULE 0x00000008
+#pragma pack(push, 8)
+  typedef struct tagMODULEENTRY32
+  {
+    DWORD   dwSize;
+    DWORD   th32ModuleID;  // This module
+    DWORD   th32ProcessID; // owning process
+    DWORD   GlblcntUsage;  // Global usage count on the module
+    DWORD   ProccntUsage;  // Module usage count in th32ProcessID's context
+    BYTE*   modBaseAddr;   // Base address of module in th32ProcessID's context
+    DWORD   modBaseSize;   // Size in bytes of module starting at modBaseAddr
+    HMODULE hModule;       // The hModule of this module in th32ProcessID's context
+    char    szModule[MAX_MODULE_NAME32 + 1];
+    char    szExePath[MAX_PATH];
+  } MODULEENTRY32;
+  typedef MODULEENTRY32* PMODULEENTRY32;
+  typedef MODULEENTRY32* LPMODULEENTRY32;
+#pragma pack(pop)
+
+  BOOL GetModuleListTH32(HANDLE hProcess, DWORD pid)
+  {
+    // CreateToolhelp32Snapshot()
+    typedef HANDLE(__stdcall * tCT32S)(DWORD dwFlags, DWORD th32ProcessID);
+    // Module32First()
+    typedef BOOL(__stdcall * tM32F)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);
+    // Module32Next()
+    typedef BOOL(__stdcall * tM32N)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);
+
+    // try both dlls...
+    const TCHAR* dllname[] = {_T("kernel32.dll"), _T("tlhelp32.dll")};
+    HINSTANCE    hToolhelp = NULL;
+    tCT32S       pCT32S = NULL;
+    tM32F        pM32F = NULL;
+    tM32N        pM32N = NULL;
+
+    HANDLE        hSnap;
+    MODULEENTRY32 me;
+    me.dwSize = sizeof(me);
+    BOOL   keepGoing;
+    size_t i;
+
+    for (i = 0; i < (sizeof(dllname) / sizeof(dllname[0])); i++)
+    {
+      hToolhelp = LoadLibrary(dllname[i]);
+      if (hToolhelp == NULL)
+        continue;
+      pCT32S = (tCT32S)GetProcAddress(hToolhelp, "CreateToolhelp32Snapshot");
+      pM32F = (tM32F)GetProcAddress(hToolhelp, "Module32First");
+      pM32N = (tM32N)GetProcAddress(hToolhelp, "Module32Next");
+      if ((pCT32S != NULL) && (pM32F != NULL) && (pM32N != NULL))
+        break; // found the functions!
+      FreeLibrary(hToolhelp);
+      hToolhelp = NULL;
+    }
+
+    if (hToolhelp == NULL)
+      return FALSE;
+
+    hSnap = pCT32S(TH32CS_SNAPMODULE, pid);
+    if (hSnap == (HANDLE)-1)
+    {
+      FreeLibrary(hToolhelp);
+      return FALSE;
+    }
+
+    keepGoing = !!pM32F(hSnap, &me);
+    int cnt = 0;
+    while (keepGoing)
+    {
+      this->LoadModule(hProcess, me.szExePath, me.szModule, (DWORD64)me.modBaseAddr,
+                       me.modBaseSize);
+      cnt++;
+      keepGoing = !!pM32N(hSnap, &me);
+    }
+    CloseHandle(hSnap);
+    FreeLibrary(hToolhelp);
+    if (cnt <= 0)
+      return FALSE;
+    return TRUE;
+  } // GetModuleListTH32
+
+  // **************************************** PSAPI ************************
+  typedef struct _MODULEINFO
+  {
+    LPVOID lpBaseOfDll;
+    DWORD  SizeOfImage;
+    LPVOID EntryPoint;
+  } MODULEINFO, *LPMODULEINFO;
+
+  BOOL GetModuleListPSAPI(HANDLE hProcess)
+  {
+    // EnumProcessModules()
+    typedef BOOL(__stdcall * tEPM)(HANDLE hProcess, HMODULE * lphModule, DWORD cb,
+                                   LPDWORD lpcbNeeded);
+    // GetModuleFileNameEx()
+    typedef DWORD(__stdcall * tGMFNE)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename,
+                                      DWORD nSize);
+    // GetModuleBaseName()
+    typedef DWORD(__stdcall * tGMBN)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename,
+                                     DWORD nSize);
+    // GetModuleInformation()
+    typedef BOOL(__stdcall * tGMI)(HANDLE hProcess, HMODULE hModule, LPMODULEINFO pmi, DWORD nSize);
+
+    HINSTANCE hPsapi;
+    tEPM      pEPM;
+    tGMFNE    pGMFNE;
+    tGMBN     pGMBN;
+    tGMI      pGMI;
+
+    DWORD i;
+    //ModuleEntry e;
+    DWORD        cbNeeded;
+    MODULEINFO   mi;
+    HMODULE*     hMods = NULL;
+    char*        tt = NULL;
+    char*        tt2 = NULL;
+    const SIZE_T TTBUFLEN = 8096;
+    int          cnt = 0;
+
+    hPsapi = LoadLibrary(_T("psapi.dll"));
+    if (hPsapi == NULL)
+      return FALSE;
+
+    pEPM = (tEPM)GetProcAddress(hPsapi, "EnumProcessModules");
+    pGMFNE = (tGMFNE)GetProcAddress(hPsapi, "GetModuleFileNameExA");
+    pGMBN = (tGMFNE)GetProcAddress(hPsapi, "GetModuleBaseNameA");
+    pGMI = (tGMI)GetProcAddress(hPsapi, "GetModuleInformation");
+    if ((pEPM == NULL) || (pGMFNE == NULL) || (pGMBN == NULL) || (pGMI == NULL))
+    {
+      // we couldn't find all functions
+      FreeLibrary(hPsapi);
+      return FALSE;
+    }
+
+    hMods = (HMODULE*)malloc(sizeof(HMODULE) * (TTBUFLEN / sizeof(HMODULE)));
+    tt = (char*)malloc(sizeof(char) * TTBUFLEN);
+    tt2 = (char*)malloc(sizeof(char) * TTBUFLEN);
+    if ((hMods == NULL) || (tt == NULL) || (tt2 == NULL))
+      goto cleanup;
+
+    if (!pEPM(hProcess, hMods, TTBUFLEN, &cbNeeded))
+    {
+      //_ftprintf(fLogFile, _T("%lu: EPM failed, GetLastError = %lu\n"), g_dwShowCount, gle );
+      goto cleanup;
+    }
+
+    if (cbNeeded > TTBUFLEN)
+    {
+      //_ftprintf(fLogFile, _T("%lu: More than %lu module handles. Huh?\n"), g_dwShowCount, lenof( hMods ) );
+      goto cleanup;
+    }
+
+    for (i = 0; i < cbNeeded / sizeof(hMods[0]); i++)
+    {
+      // base address, size
+      pGMI(hProcess, hMods[i], &mi, sizeof(mi));
+      // image file name
+      tt[0] = 0;
+      pGMFNE(hProcess, hMods[i], tt, TTBUFLEN);
+      // module name
+      tt2[0] = 0;
+      pGMBN(hProcess, hMods[i], tt2, TTBUFLEN);
+
+      DWORD dwRes = this->LoadModule(hProcess, tt, tt2, (DWORD64)mi.lpBaseOfDll, mi.SizeOfImage);
+      if (dwRes != ERROR_SUCCESS)
+        this->m_parent->OnDbgHelpErr("LoadModule", dwRes, 0);
+      cnt++;
+    }
+
+  cleanup:
+    if (hPsapi != NULL)
+      FreeLibrary(hPsapi);
+    if (tt2 != NULL)
+      free(tt2);
+    if (tt != NULL)
+      free(tt);
+    if (hMods != NULL)
+      free(hMods);
+
+    return cnt != 0;
+  } // GetModuleListPSAPI
+
+  DWORD LoadModule(HANDLE hProcess, LPCSTR img, LPCSTR mod, DWORD64 baseAddr, DWORD size)
+  {
+    CHAR* szImg = _strdup(img);
+    CHAR* szMod = _strdup(mod);
+    DWORD result = ERROR_SUCCESS;
+    if ((szImg == NULL) || (szMod == NULL))
+      result = ERROR_NOT_ENOUGH_MEMORY;
+    else
+    {
+      if (pSLM(hProcess, 0, szImg, szMod, baseAddr, size) == 0)
+        result = GetLastError();
+    }
+    ULONGLONG fileVersion = 0;
+    if ((m_parent != NULL) && (szImg != NULL))
+    {
+      // try to retrieve the file-version:
+      if ((this->m_parent->m_options & StackWalker::RetrieveFileVersion) != 0)
+      {
+        VS_FIXEDFILEINFO* fInfo = NULL;
+        DWORD             dwHandle;
+        DWORD             dwSize = GetFileVersionInfoSizeA(szImg, &dwHandle);
+        if (dwSize > 0)
+        {
+          LPVOID vData = malloc(dwSize);
+          if (vData != NULL)
+          {
+            if (GetFileVersionInfoA(szImg, dwHandle, dwSize, vData) != 0)
+            {
+              UINT  len;
+              TCHAR szSubBlock[] = _T("\\");
+              if (VerQueryValue(vData, szSubBlock, (LPVOID*)&fInfo, &len) == 0)
+                fInfo = NULL;
+              else
+              {
+                fileVersion =
+                    ((ULONGLONG)fInfo->dwFileVersionLS) + ((ULONGLONG)fInfo->dwFileVersionMS << 32);
+              }
+            }
+            free(vData);
+          }
+        }
+      }
+
+      // Retrieve some additional-infos about the module
+      IMAGEHLP_MODULE64_V3 Module;
+      const char*          szSymType = "-unknown-";
+      if (this->GetModuleInfo(hProcess, baseAddr, &Module) != FALSE)
+      {
+        switch (Module.SymType)
+        {
+          case SymNone:
+            szSymType = "-nosymbols-";
+            break;
+          case SymCoff: // 1
+            szSymType = "COFF";
+            break;
+          case SymCv: // 2
+            szSymType = "CV";
+            break;
+          case SymPdb: // 3
+            szSymType = "PDB";
+            break;
+          case SymExport: // 4
+            szSymType = "-exported-";
+            break;
+          case SymDeferred: // 5
+            szSymType = "-deferred-";
+            break;
+          case SymSym: // 6
+            szSymType = "SYM";
+            break;
+          case 7: // SymDia:
+            szSymType = "DIA";
+            break;
+          case 8: //SymVirtual:
+            szSymType = "Virtual";
+            break;
+        }
+      }
+      LPCSTR pdbName = Module.LoadedImageName;
+      if (Module.LoadedPdbName[0] != 0)
+        pdbName = Module.LoadedPdbName;
+      this->m_parent->OnLoadModule(img, mod, baseAddr, size, result, szSymType, pdbName,
+                                   fileVersion);
+    }
+    if (szImg != NULL)
+      free(szImg);
+    if (szMod != NULL)
+      free(szMod);
+    return result;
+  }
+
+public:
+  BOOL LoadModules(HANDLE hProcess, DWORD dwProcessId)
+  {
+    // first try toolhelp32
+    if (GetModuleListTH32(hProcess, dwProcessId))
+      return true;
+    // then try psapi
+    return GetModuleListPSAPI(hProcess);
+  }
+
+  BOOL GetModuleInfo(HANDLE hProcess, DWORD64 baseAddr, IMAGEHLP_MODULE64_V3* pModuleInfo)
+  {
+    memset(pModuleInfo, 0, sizeof(IMAGEHLP_MODULE64_V3));
+    if (this->pSGMI == NULL)
+    {
+      SetLastError(ERROR_DLL_INIT_FAILED);
+      return FALSE;
+    }
+    // First try to use the larger ModuleInfo-Structure
+    pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V3);
+    void* pData = malloc(
+        4096); // reserve enough memory, so the bug in v6.3.5.1 does not lead to memory-overwrites...
+    if (pData == NULL)
+    {
+      SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+      return FALSE;
+    }
+    memcpy(pData, pModuleInfo, sizeof(IMAGEHLP_MODULE64_V3));
+    static bool s_useV3Version = true;
+    if (s_useV3Version)
+    {
+      if (this->pSGMI(hProcess, baseAddr, (IMAGEHLP_MODULE64_V3*)pData) != FALSE)
+      {
+        // only copy as much memory as is reserved...
+        memcpy(pModuleInfo, pData, sizeof(IMAGEHLP_MODULE64_V3));
+        pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V3);
+        free(pData);
+        return TRUE;
+      }
+      s_useV3Version = false; // to prevent unnecessary calls with the larger struct...
+    }
+
+    // could not retrieve the bigger structure, try with the smaller one (as defined in VC7.1)...
+    pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
+    memcpy(pData, pModuleInfo, sizeof(IMAGEHLP_MODULE64_V2));
+    if (this->pSGMI(hProcess, baseAddr, (IMAGEHLP_MODULE64_V3*)pData) != FALSE)
+    {
+      // only copy as much memory as is reserved...
+      memcpy(pModuleInfo, pData, sizeof(IMAGEHLP_MODULE64_V2));
+      pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
+      free(pData);
+      return TRUE;
+    }
+    free(pData);
+    SetLastError(ERROR_DLL_INIT_FAILED);
+    return FALSE;
+  }
+};
+
+// #############################################################
+
+#if defined(_MSC_VER) && _MSC_VER >= 1400 && _MSC_VER < 1900
+extern "C" void* __cdecl _getptd();
+#endif
+#if defined(_MSC_VER) && _MSC_VER >= 1900
+extern "C" void** __cdecl __current_exception_context();
+#endif
+
+static PCONTEXT get_current_exception_context()
+{
+  PCONTEXT * pctx = NULL;
+#if defined(_MSC_VER) && _MSC_VER >= 1400 && _MSC_VER < 1900  
+  LPSTR ptd = (LPSTR)_getptd();
+  if (ptd)
+    pctx = (PCONTEXT *)(ptd + (sizeof(void*) == 4 ? 0x8C : 0xF8));
+#endif
+#if defined(_MSC_VER) && _MSC_VER >= 1900
+  pctx = (PCONTEXT *)__current_exception_context();
+#endif
+  return pctx ? *pctx : NULL;
+}
+
+bool StackWalker::Init(ExceptType extype, int options, LPCSTR szSymPath, DWORD dwProcessId,
+                       HANDLE hProcess, PEXCEPTION_POINTERS exp)
+{
+  PCONTEXT ctx = NULL;
+  if (extype == AfterCatch)
+    ctx = get_current_exception_context();
+  if (extype == AfterExcept && exp)
+    ctx = exp->ContextRecord;
+  this->m_options = options;
+  this->m_modulesLoaded = FALSE;
+  this->m_szSymPath = NULL;
+  this->m_MaxRecursionCount = 1000;
+  this->m_sw = NULL;
+  SetTargetProcess(dwProcessId, hProcess);
+  SetSymPath(szSymPath);
+  /* MSVC ignore std::nothrow specifier for `new` operator */
+  LPVOID buf = malloc(sizeof(StackWalkerInternal));
+  if (!buf)
+    return false;
+  memset(buf, 0, sizeof(StackWalkerInternal));
+  this->m_sw = new(buf) StackWalkerInternal(this, this->m_hProcess, ctx);  // placement new
+  return true;
+}
+
+StackWalker::StackWalker(DWORD dwProcessId, HANDLE hProcess)
+{
+  Init(NonExcept, OptionsAll, NULL, dwProcessId, hProcess);
+}
+
+StackWalker::StackWalker(int options, LPCSTR szSymPath, DWORD dwProcessId, HANDLE hProcess)
+{
+  Init(NonExcept, options, szSymPath, dwProcessId, hProcess);
+}
+
+StackWalker::StackWalker(ExceptType extype, int options, PEXCEPTION_POINTERS exp)
+{
+  Init(extype, options, NULL, GetCurrentProcessId(), GetCurrentProcess(), exp);
+}
+
+StackWalker::~StackWalker()
+{
+  SetSymPath(NULL);
+  if (m_sw != NULL) {
+    m_sw->~StackWalkerInternal();  // call the object's destructor
+    free(m_sw);
+  }
+  m_sw = NULL;
+}
+
+bool StackWalker::SetSymPath(LPCSTR szSymPath)
+{
+  if (m_szSymPath)
+    free(m_szSymPath);
+  m_szSymPath = NULL;
+  if (szSymPath == NULL)
+    return true;
+  m_szSymPath = _strdup(szSymPath);
+  if (m_szSymPath)
+    m_options |= SymBuildPath;
+  return true;
+}
+
+bool StackWalker::SetTargetProcess(DWORD dwProcessId, HANDLE hProcess)
+{
+  m_dwProcessId = dwProcessId;
+  m_hProcess = hProcess;
+  if (m_sw)
+    m_sw->m_hProcess = hProcess;
+  return true;
+}
+
+PCONTEXT StackWalker::GetCurrentExceptionContext()
+{
+  return get_current_exception_context();
+}
+
+BOOL StackWalker::LoadModules()
+{
+  if (this->m_sw == NULL)
+  {
+    SetLastError(ERROR_DLL_INIT_FAILED);
+    return FALSE;
+  }
+  if (m_modulesLoaded != FALSE)
+    return TRUE;
+
+  // Build the sym-path:
+  char* szSymPath = NULL;
+  if ((this->m_options & SymBuildPath) != 0)
+  {
+    const size_t nSymPathLen = 4096;
+    szSymPath = (char*)malloc(nSymPathLen);
+    if (szSymPath == NULL)
+    {
+      SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+      return FALSE;
+    }
+    szSymPath[0] = 0;
+    // Now first add the (optional) provided sympath:
+    if (this->m_szSymPath != NULL)
+    {
+      strcat_s(szSymPath, nSymPathLen, this->m_szSymPath);
+      strcat_s(szSymPath, nSymPathLen, ";");
+    }
+
+    strcat_s(szSymPath, nSymPathLen, ".;");
+
+    const size_t nTempLen = 1024;
+    char         szTemp[nTempLen];
+    // Now add the current directory:
+    if (GetCurrentDirectoryA(nTempLen, szTemp) > 0)
+    {
+      szTemp[nTempLen - 1] = 0;
+      strcat_s(szSymPath, nSymPathLen, szTemp);
+      strcat_s(szSymPath, nSymPathLen, ";");
+    }
+
+    // Now add the path for the main-module:
+    if (GetModuleFileNameA(NULL, szTemp, nTempLen) > 0)
+    {
+      szTemp[nTempLen - 1] = 0;
+      for (char* p = (szTemp + strlen(szTemp) - 1); p >= szTemp; --p)
+      {
+        // locate the rightmost path separator
+        if ((*p == '\\') || (*p == '/') || (*p == ':'))
+        {
+          *p = 0;
+          break;
+        }
+      } // for (search for path separator...)
+      if (strlen(szTemp) > 0)
+      {
+        strcat_s(szSymPath, nSymPathLen, szTemp);
+        strcat_s(szSymPath, nSymPathLen, ";");
+      }
+    }
+    if (GetEnvironmentVariableA("_NT_SYMBOL_PATH", szTemp, nTempLen) > 0)
+    {
+      szTemp[nTempLen - 1] = 0;
+      strcat_s(szSymPath, nSymPathLen, szTemp);
+      strcat_s(szSymPath, nSymPathLen, ";");
+    }
+    if (GetEnvironmentVariableA("_NT_ALTERNATE_SYMBOL_PATH", szTemp, nTempLen) > 0)
+    {
+      szTemp[nTempLen - 1] = 0;
+      strcat_s(szSymPath, nSymPathLen, szTemp);
+      strcat_s(szSymPath, nSymPathLen, ";");
+    }
+    if (GetEnvironmentVariableA("SYSTEMROOT", szTemp, nTempLen) > 0)
+    {
+      szTemp[nTempLen - 1] = 0;
+      strcat_s(szSymPath, nSymPathLen, szTemp);
+      strcat_s(szSymPath, nSymPathLen, ";");
+      // also add the "system32"-directory:
+      strcat_s(szTemp, nTempLen, "\\system32");
+      strcat_s(szSymPath, nSymPathLen, szTemp);
+      strcat_s(szSymPath, nSymPathLen, ";");
+    }
+
+    if ((this->m_options & SymUseSymSrv) != 0)
+    {
+      if (GetEnvironmentVariableA("SYSTEMDRIVE", szTemp, nTempLen) > 0)
+      {
+        szTemp[nTempLen - 1] = 0;
+        strcat_s(szSymPath, nSymPathLen, "SRV*");
+        strcat_s(szSymPath, nSymPathLen, szTemp);
+        strcat_s(szSymPath, nSymPathLen, "\\websymbols");
+        strcat_s(szSymPath, nSymPathLen, "*https://msdl.microsoft.com/download/symbols;");
+      }
+      else
+        strcat_s(szSymPath, nSymPathLen,
+                 "SRV*c:\\websymbols*https://msdl.microsoft.com/download/symbols;");
+    }
+  } // if SymBuildPath
+
+  // First Init the whole stuff...
+  BOOL bRet = this->m_sw->Init(szSymPath);
+  if (szSymPath != NULL)
+    free(szSymPath);
+  szSymPath = NULL;
+  if (bRet == FALSE)
+  {
+    this->OnDbgHelpErr("Error while initializing dbghelp.dll", 0, 0);
+    SetLastError(ERROR_DLL_INIT_FAILED);
+    return FALSE;
+  }
+
+  bRet = this->m_sw->LoadModules(this->m_hProcess, this->m_dwProcessId);
+  if (bRet != FALSE)
+    m_modulesLoaded = TRUE;
+  return bRet;
+}
+
+// The following is used to pass the "userData"-Pointer to the user-provided readMemoryFunction
+// This has to be done due to a problem with the "hProcess"-parameter in x64...
+// Because this class is in no case multi-threading-enabled (because of the limitations
+// of dbghelp.dll) it is "safe" to use a static-variable
+static StackWalker::PReadProcessMemoryRoutine s_readMemoryFunction = NULL;
+static LPVOID                                 s_readMemoryFunction_UserData = NULL;
+
+BOOL StackWalker::ShowCallstack(HANDLE                    hThread,
+                                const CONTEXT*            context,
+                                PReadProcessMemoryRoutine readMemoryFunction,
+                                LPVOID                    pUserData)
+{
+  CONTEXT                                   c;
+  CallstackEntry                            csEntry;
+  IMAGEHLP_SYMBOL64*                        pSym = NULL;
+  StackWalkerInternal::IMAGEHLP_MODULE64_V3 Module;
+  IMAGEHLP_LINE64                           Line;
+  int                                       frameNum;
+  bool                                      bLastEntryCalled = true;
+  int                                       curRecursionCount = 0;
+
+  if (m_modulesLoaded == FALSE)
+    this->LoadModules(); // ignore the result...
+
+  if (this->m_sw->m_hDbhHelp == NULL)
+  {
+    SetLastError(ERROR_DLL_INIT_FAILED);
+    return FALSE;
+  }
+
+  s_readMemoryFunction = readMemoryFunction;
+  s_readMemoryFunction_UserData = pUserData;
+
+  if (context == NULL)
+  {
+    // If no context is provided, capture the context
+    // See: https://stackwalker.codeplex.com/discussions/446958
+#if _WIN32_WINNT <= 0x0501
+    // If we need to support XP, we need to use the "old way", because "GetThreadId" is not available!
+    if (hThread == GetCurrentThread())
+#else
+    if (GetThreadId(hThread) == GetCurrentThreadId())
+#endif
+    {
+      if (m_sw->m_ctx.ContextFlags != 0)
+        c = m_sw->m_ctx;   // context taken at Init
+      else
+        GET_CURRENT_CONTEXT_STACKWALKER_CODEPLEX(c, USED_CONTEXT_FLAGS);
+    }
+    else
+    {
+      SuspendThread(hThread);
+      memset(&c, 0, sizeof(CONTEXT));
+      c.ContextFlags = USED_CONTEXT_FLAGS;
+
+      // TODO: Detect if you want to get a thread context of a different process, which is running a different processor architecture...
+      // This does only work if we are x64 and the target process is x64 or x86;
+      // It cannot work, if this process is x64 and the target process is x64... this is not supported...
+      // See also: http://www.howzatt.demon.co.uk/articles/DebuggingInWin64.html
+      if (GetThreadContext(hThread, &c) == FALSE)
+      {
+        ResumeThread(hThread);
+        return FALSE;
+      }
+    }
+  }
+  else
+    c = *context;
+
+  // init STACKFRAME for first call
+  STACKFRAME64 s; // in/out stackframe
+  memset(&s, 0, sizeof(s));
+  DWORD imageType;
+#ifdef _M_IX86
+  // normally, call ImageNtHeader() and use machine info from PE header
+  imageType = IMAGE_FILE_MACHINE_I386;
+  s.AddrPC.Offset = c.Eip;
+  s.AddrPC.Mode = AddrModeFlat;
+  s.AddrFrame.Offset = c.Ebp;
+  s.AddrFrame.Mode = AddrModeFlat;
+  s.AddrStack.Offset = c.Esp;
+  s.AddrStack.Mode = AddrModeFlat;
+#elif _M_X64
+  imageType = IMAGE_FILE_MACHINE_AMD64;
+  s.AddrPC.Offset = c.Rip;
+  s.AddrPC.Mode = AddrModeFlat;
+  s.AddrFrame.Offset = c.Rsp;
+  s.AddrFrame.Mode = AddrModeFlat;
+  s.AddrStack.Offset = c.Rsp;
+  s.AddrStack.Mode = AddrModeFlat;
+#elif _M_IA64
+  imageType = IMAGE_FILE_MACHINE_IA64;
+  s.AddrPC.Offset = c.StIIP;
+  s.AddrPC.Mode = AddrModeFlat;
+  s.AddrFrame.Offset = c.IntSp;
+  s.AddrFrame.Mode = AddrModeFlat;
+  s.AddrBStore.Offset = c.RsBSP;
+  s.AddrBStore.Mode = AddrModeFlat;
+  s.AddrStack.Offset = c.IntSp;
+  s.AddrStack.Mode = AddrModeFlat;
+#elif _M_ARM64
+  imageType = IMAGE_FILE_MACHINE_ARM64;
+  s.AddrPC.Offset = c.Pc;
+  s.AddrPC.Mode = AddrModeFlat;
+  s.AddrFrame.Offset = c.Fp;
+  s.AddrFrame.Mode = AddrModeFlat;
+  s.AddrStack.Offset = c.Sp;
+  s.AddrStack.Mode = AddrModeFlat;
+#else
+#error "Platform not supported!"
+#endif
+
+  pSym = (IMAGEHLP_SYMBOL64*)malloc(sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
+  if (!pSym)
+    goto cleanup; // not enough memory...
+  memset(pSym, 0, sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
+  pSym->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
+  pSym->MaxNameLength = STACKWALK_MAX_NAMELEN;
+
+  memset(&Line, 0, sizeof(Line));
+  Line.SizeOfStruct = sizeof(Line);
+
+  memset(&Module, 0, sizeof(Module));
+  Module.SizeOfStruct = sizeof(Module);
+
+  for (frameNum = 0;; ++frameNum)
+  {
+    // get next stack frame (StackWalk64(), SymFunctionTableAccess64(), SymGetModuleBase64())
+    // if this returns ERROR_INVALID_ADDRESS (487) or ERROR_NOACCESS (998), you can
+    // assume that either you are done, or that the stack is so hosed that the next
+    // deeper frame could not be found.
+    // CONTEXT need not to be supplied if imageTyp is IMAGE_FILE_MACHINE_I386!
+    if (!this->m_sw->pSW(imageType, this->m_hProcess, hThread, &s, &c, myReadProcMem,
+                         this->m_sw->pSFTA, this->m_sw->pSGMB, NULL))
+    {
+      // INFO: "StackWalk64" does not set "GetLastError"...
+      this->OnDbgHelpErr("StackWalk64", 0, s.AddrPC.Offset);
+      break;
+    }
+
+    csEntry.offset = s.AddrPC.Offset;
+    csEntry.name[0] = 0;
+    csEntry.undName[0] = 0;
+    csEntry.undFullName[0] = 0;
+    csEntry.offsetFromSmybol = 0;
+    csEntry.offsetFromLine = 0;
+    csEntry.lineFileName[0] = 0;
+    csEntry.lineNumber = 0;
+    csEntry.loadedImageName[0] = 0;
+    csEntry.moduleName[0] = 0;
+    if (s.AddrPC.Offset == s.AddrReturn.Offset)
+    {
+      if ((this->m_MaxRecursionCount > 0) && (curRecursionCount > m_MaxRecursionCount))
+      {
+        this->OnDbgHelpErr("StackWalk64-Endless-Callstack!", 0, s.AddrPC.Offset);
+        break;
+      }
+      curRecursionCount++;
+    }
+    else
+      curRecursionCount = 0;
+    if (s.AddrPC.Offset != 0)
+    {
+      // we seem to have a valid PC
+      // show procedure info (SymGetSymFromAddr64())
+      if (this->m_sw->pSGSFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromSmybol),
+                             pSym) != FALSE)
+      {
+        MyStrCpy(csEntry.name, STACKWALK_MAX_NAMELEN, pSym->Name);
+        // UnDecorateSymbolName()
+        this->m_sw->pUDSN(pSym->Name, csEntry.undName, STACKWALK_MAX_NAMELEN, UNDNAME_NAME_ONLY);
+        this->m_sw->pUDSN(pSym->Name, csEntry.undFullName, STACKWALK_MAX_NAMELEN, UNDNAME_COMPLETE);
+      }
+      else
+      {
+        this->OnDbgHelpErr("SymGetSymFromAddr64", GetLastError(), s.AddrPC.Offset);
+      }
+
+      // show line number info, NT5.0-method (SymGetLineFromAddr64())
+      if (this->m_sw->pSGLFA != NULL)
+      { // yes, we have SymGetLineFromAddr64()
+        if (this->m_sw->pSGLFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromLine),
+                               &Line) != FALSE)
+        {
+          csEntry.lineNumber = Line.LineNumber;
+          MyStrCpy(csEntry.lineFileName, STACKWALK_MAX_NAMELEN, Line.FileName);
+        }
+        else
+        {
+          this->OnDbgHelpErr("SymGetLineFromAddr64", GetLastError(), s.AddrPC.Offset);
+        }
+      } // yes, we have SymGetLineFromAddr64()
+
+      // show module info (SymGetModuleInfo64())
+      if (this->m_sw->GetModuleInfo(this->m_hProcess, s.AddrPC.Offset, &Module) != FALSE)
+      { // got module info OK
+        switch (Module.SymType)
+        {
+          case SymNone:
+            csEntry.symTypeString = "-nosymbols-";
+            break;
+          case SymCoff:
+            csEntry.symTypeString = "COFF";
+            break;
+          case SymCv:
+            csEntry.symTypeString = "CV";
+            break;
+          case SymPdb:
+            csEntry.symTypeString = "PDB";
+            break;
+          case SymExport:
+            csEntry.symTypeString = "-exported-";
+            break;
+          case SymDeferred:
+            csEntry.symTypeString = "-deferred-";
+            break;
+          case SymSym:
+            csEntry.symTypeString = "SYM";
+            break;
+#if API_VERSION_NUMBER >= 9
+          case SymDia:
+            csEntry.symTypeString = "DIA";
+            break;
+#endif
+          case 8: //SymVirtual:
+            csEntry.symTypeString = "Virtual";
+            break;
+          default:
+            //_snprintf( ty, sizeof(ty), "symtype=%ld", (long) Module.SymType );
+            csEntry.symTypeString = NULL;
+            break;
+        }
+
+        MyStrCpy(csEntry.moduleName, STACKWALK_MAX_NAMELEN, Module.ModuleName);
+        csEntry.baseOfImage = Module.BaseOfImage;
+        MyStrCpy(csEntry.loadedImageName, STACKWALK_MAX_NAMELEN, Module.LoadedImageName);
+      } // got module info OK
+      else
+      {
+        this->OnDbgHelpErr("SymGetModuleInfo64", GetLastError(), s.AddrPC.Offset);
+      }
+    } // we seem to have a valid PC
+
+    CallstackEntryType et = nextEntry;
+    if (frameNum == 0)
+      et = firstEntry;
+    bLastEntryCalled = false;
+    this->OnCallstackEntry(et, csEntry);
+
+    if (s.AddrReturn.Offset == 0)
+    {
+      bLastEntryCalled = true;
+      this->OnCallstackEntry(lastEntry, csEntry);
+      SetLastError(ERROR_SUCCESS);
+      break;
+    }
+  } // for ( frameNum )
+
+cleanup:
+  if (pSym)
+    free(pSym);
+
+  if (bLastEntryCalled == false)
+    this->OnCallstackEntry(lastEntry, csEntry);
+
+  if (context == NULL)
+    ResumeThread(hThread);
+
+  return TRUE;
+}
+
+BOOL StackWalker::ShowObject(LPVOID pObject)
+{
+  // Load modules if not done yet
+  if (m_modulesLoaded == FALSE)
+    this->LoadModules(); // ignore the result...
+
+  // Verify that the DebugHelp.dll was actually found
+  if (this->m_sw->m_hDbhHelp == NULL)
+  {
+    SetLastError(ERROR_DLL_INIT_FAILED);
+    return FALSE;
+  }
+
+  // SymGetSymFromAddr64() is required
+  if (this->m_sw->pSGSFA == NULL)
+    return FALSE;
+
+  // Show object info (SymGetSymFromAddr64())
+  DWORD64            dwAddress = DWORD64(pObject);
+  DWORD64            dwDisplacement = 0;
+  const SIZE_T       symSize = sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN;
+  IMAGEHLP_SYMBOL64* pSym = (IMAGEHLP_SYMBOL64*) malloc(symSize);
+  if (!pSym)
+    return FALSE;
+  memset(pSym, 0, symSize);
+  pSym->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
+  pSym->MaxNameLength = STACKWALK_MAX_NAMELEN;
+  if (this->m_sw->pSGSFA(this->m_hProcess, dwAddress, &dwDisplacement, pSym) == FALSE)
+  {
+    this->OnDbgHelpErr("SymGetSymFromAddr64", GetLastError(), dwAddress);
+    return FALSE;
+  }
+  // Object name output
+  this->OnOutput(pSym->Name);
+
+  free(pSym);
+  return TRUE;
+};
+
+BOOL __stdcall StackWalker::myReadProcMem(HANDLE  hProcess,
+                                          DWORD64 qwBaseAddress,
+                                          PVOID   lpBuffer,
+                                          DWORD   nSize,
+                                          LPDWORD lpNumberOfBytesRead)
+{
+  if (s_readMemoryFunction == NULL)
+  {
+    SIZE_T st;
+    BOOL   bRet = ReadProcessMemory(hProcess, (LPVOID)qwBaseAddress, lpBuffer, nSize, &st);
+    *lpNumberOfBytesRead = (DWORD)st;
+    //printf("ReadMemory: hProcess: %p, baseAddr: %p, buffer: %p, size: %d, read: %d, result: %d\n", hProcess, (LPVOID) qwBaseAddress, lpBuffer, nSize, (DWORD) st, (DWORD) bRet);
+    return bRet;
+  }
+  else
+  {
+    return s_readMemoryFunction(hProcess, qwBaseAddress, lpBuffer, nSize, lpNumberOfBytesRead,
+                                s_readMemoryFunction_UserData);
+  }
+}
+
+void StackWalker::OnLoadModule(LPCSTR    img,
+                               LPCSTR    mod,
+                               DWORD64   baseAddr,
+                               DWORD     size,
+                               DWORD     result,
+                               LPCSTR    symType,
+                               LPCSTR    pdbName,
+                               ULONGLONG fileVersion)
+{
+  CHAR   buffer[STACKWALK_MAX_NAMELEN];
+  size_t maxLen = STACKWALK_MAX_NAMELEN;
+#if _MSC_VER >= 1400
+  maxLen = _TRUNCATE;
+#endif
+  if (fileVersion == 0)
+    _snprintf_s(buffer, maxLen, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s'\n",
+                img, mod, (LPVOID)baseAddr, size, result, symType, pdbName);
+  else
+  {
+    DWORD v4 = (DWORD)(fileVersion & 0xFFFF);
+    DWORD v3 = (DWORD)((fileVersion >> 16) & 0xFFFF);
+    DWORD v2 = (DWORD)((fileVersion >> 32) & 0xFFFF);
+    DWORD v1 = (DWORD)((fileVersion >> 48) & 0xFFFF);
+    _snprintf_s(
+        buffer, maxLen,
+        "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s', fileVersion: %d.%d.%d.%d\n",
+        img, mod, (LPVOID)baseAddr, size, result, symType, pdbName, v1, v2, v3, v4);
+  }
+  buffer[STACKWALK_MAX_NAMELEN - 1] = 0; // be sure it is NULL terminated
+  OnOutput(buffer);
+}
+
+void StackWalker::OnCallstackEntry(CallstackEntryType eType, CallstackEntry& entry)
+{
+  CHAR   buffer[STACKWALK_MAX_NAMELEN];
+  size_t maxLen = STACKWALK_MAX_NAMELEN;
+#if _MSC_VER >= 1400
+  maxLen = _TRUNCATE;
+#endif
+  if ((eType != lastEntry) && (entry.offset != 0))
+  {
+    if (entry.name[0] == 0)
+      MyStrCpy(entry.name, STACKWALK_MAX_NAMELEN, "(function-name not available)");
+    if (entry.undName[0] != 0)
+      MyStrCpy(entry.name, STACKWALK_MAX_NAMELEN, entry.undName);
+    if (entry.undFullName[0] != 0)
+      MyStrCpy(entry.name, STACKWALK_MAX_NAMELEN, entry.undFullName);
+    if (entry.lineFileName[0] == 0)
+    {
+      MyStrCpy(entry.lineFileName, STACKWALK_MAX_NAMELEN, "(filename not available)");
+      if (entry.moduleName[0] == 0)
+        MyStrCpy(entry.moduleName, STACKWALK_MAX_NAMELEN, "(module-name not available)");
+      _snprintf_s(buffer, maxLen, "%p (%s): %s: %s\n", (LPVOID)entry.offset, entry.moduleName,
+                  entry.lineFileName, entry.name);
+    }
+    else
+      _snprintf_s(buffer, maxLen, "%s (%d): %s\n", entry.lineFileName, entry.lineNumber,
+                  entry.name);
+    buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
+    OnOutput(buffer);
+  }
+}
+
+void StackWalker::OnDbgHelpErr(LPCSTR szFuncName, DWORD gle, DWORD64 addr)
+{
+  CHAR   buffer[STACKWALK_MAX_NAMELEN];
+  size_t maxLen = STACKWALK_MAX_NAMELEN;
+#if _MSC_VER >= 1400
+  maxLen = _TRUNCATE;
+#endif
+  _snprintf_s(buffer, maxLen, "ERROR: %s, GetLastError: %d (Address: %p)\n", szFuncName, gle,
+              (LPVOID)addr);
+  buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
+  OnOutput(buffer);
+}
+
+void StackWalker::OnSymInit(LPCSTR szSearchPath, DWORD symOptions, LPCSTR szUserName)
+{
+  CHAR   buffer[STACKWALK_MAX_NAMELEN];
+  size_t maxLen = STACKWALK_MAX_NAMELEN;
+#if _MSC_VER >= 1400
+  maxLen = _TRUNCATE;
+#endif
+  _snprintf_s(buffer, maxLen, "SymInit: Symbol-SearchPath: '%s', symOptions: %d, UserName: '%s'\n",
+              szSearchPath, symOptions, szUserName);
+  buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
+  OnOutput(buffer);
+  // Also display the OS-version
+#if _MSC_VER <= 1200
+  OSVERSIONINFOA ver;
+  ZeroMemory(&ver, sizeof(OSVERSIONINFOA));
+  ver.dwOSVersionInfoSize = sizeof(ver);
+  if (GetVersionExA(&ver) != FALSE)
+  {
+    _snprintf_s(buffer, maxLen, "OS-Version: %d.%d.%d (%s)\n", ver.dwMajorVersion,
+                ver.dwMinorVersion, ver.dwBuildNumber, ver.szCSDVersion);
+    buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
+    OnOutput(buffer);
+  }
+#else
+  OSVERSIONINFOEXA ver;
+  ZeroMemory(&ver, sizeof(OSVERSIONINFOEXA));
+  ver.dwOSVersionInfoSize = sizeof(ver);
+#if _MSC_VER >= 1900
+#pragma warning(push)
+#pragma warning(disable : 4996)
+#endif
+  if (GetVersionExA((OSVERSIONINFOA*)&ver) != FALSE)
+  {
+    _snprintf_s(buffer, maxLen, "OS-Version: %d.%d.%d (%s) 0x%x-0x%x\n", ver.dwMajorVersion,
+                ver.dwMinorVersion, ver.dwBuildNumber, ver.szCSDVersion, ver.wSuiteMask,
+                ver.wProductType);
+    buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
+    OnOutput(buffer);
+  }
+#if _MSC_VER >= 1900
+#pragma warning(pop)
+#endif
+#endif
+}
+
+void StackWalker::OnOutput(LPCSTR buffer)
+{
+  OutputDebugStringA(buffer);
+}
diff --git a/src/slic3r/StackWalker.h b/src/slic3r/StackWalker.h
new file mode 100644
index 000000000..5ab241ec1
--- /dev/null
+++ b/src/slic3r/StackWalker.h
@@ -0,0 +1,273 @@
+#ifndef __STACKWALKER_H__
+#define __STACKWALKER_H__
+
+#if defined(_MSC_VER)
+
+/**********************************************************************
+ *
+ * StackWalker.h
+ *
+ *
+ *
+ * LICENSE (http://www.opensource.org/licenses/bsd-license.php)
+ *
+ *   Copyright (c) 2005-2009, Jochen Kalmbach
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without modification,
+ *   are permitted provided that the following conditions are met:
+ *
+ *   Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *   Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *   Neither the name of Jochen Kalmbach nor the names of its contributors may be
+ *   used to endorse or promote products derived from this software without
+ *   specific prior written permission.
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ *   THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ *   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ *   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * **********************************************************************/
+// #pragma once is supported starting with _MSC_VER 1000,
+// so we need not to check the version (because we only support _MSC_VER >= 1100)!
+#pragma once
+
+#include <windows.h>
+
+// special defines for VC5/6 (if no actual PSDK is installed):
+#if _MSC_VER < 1300
+typedef unsigned __int64 DWORD64, *PDWORD64;
+#if defined(_WIN64)
+typedef unsigned __int64 SIZE_T, *PSIZE_T;
+#else
+typedef unsigned long SIZE_T, *PSIZE_T;
+#endif
+#endif // _MSC_VER < 1300
+
+class StackWalkerInternal; // forward
+class StackWalker
+{
+public:
+  typedef enum ExceptType
+  {
+    NonExcept   = 0,     // RtlCaptureContext
+    AfterExcept = 1,
+    AfterCatch  = 2,     // get_current_exception_context
+  } ExceptType;
+
+  typedef enum StackWalkOptions
+  {
+    // No addition info will be retrieved
+    // (only the address is available)
+    RetrieveNone = 0,
+
+    // Try to get the symbol-name
+    RetrieveSymbol = 1,
+
+    // Try to get the line for this symbol
+    RetrieveLine = 2,
+
+    // Try to retrieve the module-infos
+    RetrieveModuleInfo = 4,
+
+    // Also retrieve the version for the DLL/EXE
+    RetrieveFileVersion = 8,
+
+    // Contains all the above
+    RetrieveVerbose = 0xF,
+
+    // Generate a "good" symbol-search-path
+    SymBuildPath = 0x10,
+
+    // Also use the public Microsoft-Symbol-Server
+    SymUseSymSrv = 0x20,
+
+    // Contains all the above "Sym"-options
+    SymAll = 0x30,
+
+    // Contains all options (default)
+    OptionsAll = 0x3F
+  } StackWalkOptions;
+
+  StackWalker(ExceptType extype, int options = OptionsAll, PEXCEPTION_POINTERS exp = NULL);
+
+  StackWalker(int    options = OptionsAll, // 'int' is by design, to combine the enum-flags
+              LPCSTR szSymPath = NULL,
+              DWORD  dwProcessId = GetCurrentProcessId(),
+              HANDLE hProcess = GetCurrentProcess());
+
+  StackWalker(DWORD dwProcessId, HANDLE hProcess);
+
+  virtual ~StackWalker();
+
+  bool SetSymPath(LPCSTR szSymPath);
+
+  bool SetTargetProcess(DWORD dwProcessId, HANDLE hProcess);
+
+  PCONTEXT GetCurrentExceptionContext();
+
+private:
+  bool Init(ExceptType extype, int options, LPCSTR szSymPath, DWORD dwProcessId,
+            HANDLE hProcess, PEXCEPTION_POINTERS exp = NULL);
+
+public:
+  typedef BOOL(__stdcall* PReadProcessMemoryRoutine)(
+      HANDLE  hProcess,
+      DWORD64 qwBaseAddress,
+      PVOID   lpBuffer,
+      DWORD   nSize,
+      LPDWORD lpNumberOfBytesRead,
+      LPVOID  pUserData // optional data, which was passed in "ShowCallstack"
+  );
+
+  BOOL LoadModules();
+
+  BOOL ShowCallstack(
+      HANDLE                    hThread = GetCurrentThread(),
+      const CONTEXT*            context = NULL,
+      PReadProcessMemoryRoutine readMemoryFunction = NULL,
+      LPVOID pUserData = NULL // optional to identify some data in the 'readMemoryFunction'-callback
+  );
+
+  BOOL ShowObject(LPVOID pObject);
+
+#if _MSC_VER >= 1300
+  // due to some reasons, the "STACKWALK_MAX_NAMELEN" must be declared as "public"
+  // in older compilers in order to use it... starting with VC7 we can declare it as "protected"
+protected:
+#endif
+  enum
+  {
+    STACKWALK_MAX_NAMELEN = 1024
+  }; // max name length for found symbols
+
+protected:
+  // Entry for each Callstack-Entry
+  typedef struct CallstackEntry
+  {
+    DWORD64 offset; // if 0, we have no valid entry
+    CHAR    name[STACKWALK_MAX_NAMELEN];
+    CHAR    undName[STACKWALK_MAX_NAMELEN];
+    CHAR    undFullName[STACKWALK_MAX_NAMELEN];
+    DWORD64 offsetFromSmybol;
+    DWORD   offsetFromLine;
+    DWORD   lineNumber;
+    CHAR    lineFileName[STACKWALK_MAX_NAMELEN];
+    DWORD   symType;
+    LPCSTR  symTypeString;
+    CHAR    moduleName[STACKWALK_MAX_NAMELEN];
+    DWORD64 baseOfImage;
+    CHAR    loadedImageName[STACKWALK_MAX_NAMELEN];
+  } CallstackEntry;
+
+  typedef enum CallstackEntryType
+  {
+    firstEntry,
+    nextEntry,
+    lastEntry
+  } CallstackEntryType;
+
+  virtual void OnSymInit(LPCSTR szSearchPath, DWORD symOptions, LPCSTR szUserName);
+  virtual void OnLoadModule(LPCSTR    img,
+                            LPCSTR    mod,
+                            DWORD64   baseAddr,
+                            DWORD     size,
+                            DWORD     result,
+                            LPCSTR    symType,
+                            LPCSTR    pdbName,
+                            ULONGLONG fileVersion);
+  virtual void OnCallstackEntry(CallstackEntryType eType, CallstackEntry& entry);
+  virtual void OnDbgHelpErr(LPCSTR szFuncName, DWORD gle, DWORD64 addr);
+  virtual void OnOutput(LPCSTR szText);
+
+  StackWalkerInternal* m_sw;
+  HANDLE               m_hProcess;
+  DWORD                m_dwProcessId;
+  BOOL                 m_modulesLoaded;
+  LPSTR                m_szSymPath;
+
+  int m_options;
+  int m_MaxRecursionCount;
+
+  static BOOL __stdcall myReadProcMem(HANDLE  hProcess,
+                                      DWORD64 qwBaseAddress,
+                                      PVOID   lpBuffer,
+                                      DWORD   nSize,
+                                      LPDWORD lpNumberOfBytesRead);
+
+  friend StackWalkerInternal;
+}; // class StackWalker
+
+// The "ugly" assembler-implementation is needed for systems before XP
+// If you have a new PSDK and you only compile for XP and later, then you can use
+// the "RtlCaptureContext"
+// Currently there is no define which determines the PSDK-Version...
+// So we just use the compiler-version (and assumes that the PSDK is
+// the one which was installed by the VS-IDE)
+
+// INFO: If you want, you can use the RtlCaptureContext if you only target XP and later...
+//       But I currently use it in x64/IA64 environments...
+//#if defined(_M_IX86) && (_WIN32_WINNT <= 0x0500) && (_MSC_VER < 1400)
+
+#if defined(_M_IX86)
+#ifdef CURRENT_THREAD_VIA_EXCEPTION
+// TODO: The following is not a "good" implementation,
+// because the callstack is only valid in the "__except" block...
+#define GET_CURRENT_CONTEXT_STACKWALKER_CODEPLEX(c, contextFlags)               \
+  do                                                                            \
+  {                                                                             \
+    memset(&c, 0, sizeof(CONTEXT));                                             \
+    EXCEPTION_POINTERS* pExp = NULL;                                            \
+    __try                                                                       \
+    {                                                                           \
+      throw 0;                                                                  \
+    }                                                                           \
+    __except (((pExp = GetExceptionInformation()) ? EXCEPTION_EXECUTE_HANDLER   \
+                                                  : EXCEPTION_EXECUTE_HANDLER)) \
+    {                                                                           \
+    }                                                                           \
+    if (pExp != NULL)                                                           \
+      memcpy(&c, pExp->ContextRecord, sizeof(CONTEXT));                         \
+    c.ContextFlags = contextFlags;                                              \
+  } while (0);
+#else
+// clang-format off
+// The following should be enough for walking the callstack...
+#define GET_CURRENT_CONTEXT_STACKWALKER_CODEPLEX(c, contextFlags) \
+  do                                                              \
+  {                                                               \
+    memset(&c, 0, sizeof(CONTEXT));                               \
+    c.ContextFlags = contextFlags;                                \
+    __asm    call x                                               \
+    __asm x: pop eax                                              \
+    __asm    mov c.Eip, eax                                       \
+    __asm    mov c.Ebp, ebp                                       \
+    __asm    mov c.Esp, esp                                       \
+  } while (0)
+// clang-format on
+#endif
+
+#else
+
+// The following is defined for x86 (XP and higher), x64 and IA64:
+#define GET_CURRENT_CONTEXT_STACKWALKER_CODEPLEX(c, contextFlags) \
+  do                                                              \
+  {                                                               \
+    memset(&c, 0, sizeof(CONTEXT));                               \
+    c.ContextFlags = contextFlags;                                \
+    RtlCaptureContext(&c);                                        \
+  } while (0);
+#endif
+
+#endif //defined(_MSC_VER)
+
+#endif // __STACKWALKER_H__