stackwalker.cpp

Go to the documentation of this file.

 
//  Copyright (c) 2003-2021 Xsens Technologies B.V. or subsidiaries worldwide.
//  All rights reserved.
//  
//  Redistribution and use in source and binary forms, with or without modification,
//  are permitted provided that the following conditions are met:
//  
//  1.  Redistributions of source code must retain the above copyright notice,
//      this list of conditions, and the following disclaimer.
//  
//  2.  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.
//  
//  3.  Neither the names of the copyright holders nor the names of their 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 HOLDERS 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.THE LAWS OF THE NETHERLANDS 
//  SHALL BE EXCLUSIVELY APPLICABLE AND ANY DISPUTES SHALL BE FINALLY SETTLED UNDER THE RULES 
//  OF ARBITRATION OF THE INTERNATIONAL CHAMBER OF COMMERCE IN THE HAGUE BY ONE OR MORE 
//  ARBITRATORS APPOINTED IN ACCORDANCE WITH SAID RULES.
//  
 
 
//  Copyright (c) 2003-2021 Xsens Technologies B.V. or subsidiaries worldwide.
//  All rights reserved.
//  
//  Redistribution and use in source and binary forms, with or without modification,
//  are permitted provided that the following conditions are met:
//  
//  1.  Redistributions of source code must retain the above copyright notice,
//      this list of conditions, and the following disclaimer.
//  
//  2.  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.
//  
//  3.  Neither the names of the copyright holders nor the names of their 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 HOLDERS 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.THE LAWS OF THE NETHERLANDS 
//  SHALL BE EXCLUSIVELY APPLICABLE AND ANY DISPUTES SHALL BE FINALLY SETTLED UNDER THE RULES 
//  OF ARBITRATION OF THE INTERNATIONAL CHAMBER OF COMMERCE IN THE HAGUE BY ONE OR MORE 
//  ARBITRATORS APPOINTED IN ACCORDANCE WITH SAID RULES.
//  
 
/**********************************************************************
 
         StackWalker.cpp
 
 
         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 paremeter)
                             - 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!
 
        **********************************************************************/
 
#ifndef __GNUC__
 
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#pragma comment(lib, "version.lib")  // for "VerQueryValue"
 
#include "stackwalker.h"
 
 
// If VC7 and later, then use the shipped 'dbghelp.h'-file
#if _MSC_VER >= 1300
#pragma warning(push)
#pragma warning(disable: 4091)
#include <dbghelp.h>
#pragma warning(pop)
#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
);
 
#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;
#endif  // _MSC_VER < 1300
 
// 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 strcpy
        #define strcat_s(dst, len, src) strcat(dst, src)
        #define _snprintf_s _snprintf
        #define _tcscat_s _tcscat
#endif
 
// 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)
        {
                m_parent = parent;
                m_hDbhHelp = NULL;
                pSC = NULL;
                m_hProcess = hProcess;
                m_szSymPath = NULL;
                pSFTA = NULL;
                pSGLFA = NULL;
                pSGMB = NULL;
                pSGMI = NULL;
                pSGO = NULL;
                pSGSFA = NULL;
                pSI = NULL;
                pSLM = NULL;
                pSSO = NULL;
                pSW = NULL;
                pUDSN = NULL;
                pSGSP = NULL;
        }
 
        ~StackWalkerInternal()
        {
                if (pSC != NULL)
                        pSC(m_hProcess);  // SymCleanup
                if (m_hDbhHelp != NULL)
                        FreeLibrary(m_hDbhHelp);
                m_hDbhHelp = NULL;
                m_parent = NULL;
                if (m_szSymPath != NULL)
                        free(m_szSymPath);
                m_szSymPath = NULL;
        }
 
        BOOL Init(LPCSTR szSymPath)
        {
                if (m_parent == NULL)
                        return FALSE;
                // Dynamically load the Entry-Points for dbghelp.dll:
                // First try to load the newsest one from
                TCHAR szTemp[4096];
                // But before wqe 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"
                                if (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);
                                }
                                // Still not found? Then try to load the 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);
                                }
                        }
                }
                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");
                //pSGMI_V3 = (tSGMI_V3) 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 (szSymPath != NULL)
                        m_szSymPath = _strdup(szSymPath);
                if (pSI(m_hProcess, m_szSymPath, FALSE) == FALSE)
                        m_parent->OnDbgHelpErr("SymInitialize", GetLastError(), 0);
 
                DWORD symOptions = pSGO();  // SymGetOptions
                symOptions |= SYMOPT_LOAD_LINES;
                symOptions |= SYMOPT_FAIL_CRITICAL_ERRORS;
                //symOptions |= SYMOPT_NO_PROMPTS;
                // SymSetOptions
                symOptions = pSSO(symOptions);
 
                char buf[StackWalker::STACKWALK_MAX_NAMELEN] = {0};
                if (pSGSP != NULL)
                {
                        if (!pSGSP(m_hProcess, buf, StackWalker::STACKWALK_MAX_NAMELEN))
                                m_parent->OnDbgHelpErr("SymGetSearchPath", GetLastError(), 0);
                }
                char szUserName[1024] = {0};
                DWORD dwSize = 1024;
                GetUserNameA(szUserName, &dwSize);
                m_parent->OnSymInit(buf, symOptions, szUserName);
 
                return TRUE;
        }
 
        StackWalker* m_parent;
 
        HMODULE m_hDbhHelp;
        HANDLE m_hProcess;
        LPSTR m_szSymPath;
 
        /*  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
                // new elements: 07-Jun-2002
                CHAR     LoadedImageName[256];   // symbol file name
                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
            };
        */
        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
        };
 
 
        // 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_V2* ModuleInfo);
        tSGMI pSGMI;
 
        //  // SymGetModuleInfo64()
        //  typedef BOOL (__stdcall *tSGMI_V3)( IN HANDLE hProcess, IN DWORD64 dwAddr, OUT IMAGEHLP_MODULE64_V3 *ModuleInfo );
        //  tSGMI_V3 pSGMI_V3;
 
        // 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 PSTR UserSearchPath, IN BOOL fInvadeProcess);
        tSI pSI;
 
        // SymLoadModule64()
        typedef DWORD64(__stdcall* tSLM)(IN HANDLE hProcess, IN HANDLE hFile,
                IN PSTR ImageName, IN PSTR 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* tUDSN)(PCSTR DecoratedName, PSTR UnDecoratedName,
                DWORD UndecoratedLength, DWORD Flags);
        tUDSN pUDSN;
 
        typedef BOOL (__stdcall* 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)
                        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;
                char* tt;
                char* tt2;
                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 couldnt 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)
                                m_parent->OnDbgHelpErr("LoadModule", dwRes, 0);
                        cnt++;
                }
 
cleanup:
                FreeLibrary(hPsapi);
                if (tt2 != NULL)
                        free(tt2);
                if (tt != NULL)
                        free(tt);
                if (hMods != NULL)
                        free(hMods);
 
                return (cnt != 0) ? TRUE : FALSE;
        }  // 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 retrive the file-version:
                        if ((m_parent->m_options & (int) 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)
                                                                fileVersion = ((ULONGLONG)fInfo->dwFileVersionLS) + ((ULONGLONG)fInfo->dwFileVersionMS << 32);
                                                }
                                                free(vData);
                                        }
                                }
                        }
 
                        // Retrieve some additional-infos about the module
                        IMAGEHLP_MODULE64_V2 Module;
                        const char* szSymType = "-unknown-";
                        if (this->GetModuleInfo(hProcess, baseAddr, &Module) != FALSE)
                        {
                                switch (Module.SymType)
                                {
                                        case SymNone:
                                                szSymType = "-nosymbols-";
                                                break;
                                        case SymCoff:
                                                szSymType = "COFF";
                                                break;
                                        case SymCv:
                                                szSymType = "CV";
                                                break;
                                        case SymPdb:
                                                szSymType = "PDB";
                                                break;
                                        case SymExport:
                                                szSymType = "-exported-";
                                                break;
                                        case SymDeferred:
                                                szSymType = "-deferred-";
                                                break;
                                        case SymSym:
                                                szSymType = "SYM";
                                                break;
                                        case SymVirtual:
                                                szSymType = "Virtual";
                                                break;
                                        case SymDia:
                                                szSymType = "DIA";
                                                break;
                                }
                        }
                        m_parent->OnLoadModule(img, mod, baseAddr, size, result, szSymType, Module.LoadedImageName, 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_V2* pModuleInfo)
        {
                if (pSGMI == NULL)
                {
                        SetLastError(ERROR_DLL_INIT_FAILED);
                        return FALSE;
                }
                // First try to use the larger ModuleInfo-Structure
                //    memset(pModuleInfo, 0, sizeof(IMAGEHLP_MODULE64_V3));
                //    pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V3);
                //    if (this->pSGMI_V3 != NULL)
                //    {
                //      if (this->pSGMI_V3(hProcess, baseAddr, pModuleInfo) != FALSE)
                //        return TRUE;
                //      // check if the parameter was wrong (size is bad...)
                //      if (GetLastError() != ERROR_INVALID_PARAMETER)
                //        return FALSE;
                //    }
                // could not retrive the bigger structure, try with the smaller one (as defined in VC7.1)...
                pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
                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_V2));
                if (pSGMI(hProcess, baseAddr, (IMAGEHLP_MODULE64_V2*) 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;
        }
};
 
// #############################################################
StackWalker::StackWalker(DWORD dwProcessId, HANDLE hProcess)
{
        m_options = (int) OptionsAll;
        m_modulesLoaded = FALSE;
        m_hProcess = hProcess;
        m_sw = new StackWalkerInternal(this, m_hProcess);
        m_dwProcessId = dwProcessId;
        m_szSymPath = NULL;
}
StackWalker::StackWalker(int options, LPCSTR szSymPath, DWORD dwProcessId, HANDLE hProcess)
{
        m_options = options;
        m_modulesLoaded = FALSE;
        m_hProcess = hProcess;
        m_sw = new StackWalkerInternal(this, m_hProcess);
        m_dwProcessId = dwProcessId;
        if (szSymPath != NULL)
        {
                m_szSymPath = _strdup(szSymPath);
                m_options |= (int) SymBuildPath;
        }
        else
                m_szSymPath = NULL;
}
 
StackWalker::~StackWalker()
{
        if (m_szSymPath != NULL)
                free(m_szSymPath);
        m_szSymPath = NULL;
        if (m_sw != NULL)
                delete m_sw;
        m_sw = NULL;
}
 
BOOL StackWalker::LoadModules()
{
        if (m_sw == NULL)
        {
                SetLastError(ERROR_DLL_INIT_FAILED);
                return FALSE;
        }
        if (m_modulesLoaded != FALSE)
                return TRUE;
 
        // Build the sym-path:
        char* szSymPath = NULL;
        if ((m_options & (int) 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 (m_szSymPath != NULL)
                {
                        strcat_s(szSymPath, nSymPathLen, 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 ((m_options & (int) SymBuildPath) != 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, "*http://msdl.microsoft.com/download/symbols;");
                        }
                        else
                                strcat_s(szSymPath, nSymPathLen, "SRV*c:\\websymbols*http://msdl.microsoft.com/download/symbols;");
                }
        }
 
        // First Init the whole stuff...
        BOOL bRet = 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 = m_sw->LoadModules(m_hProcess, 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;
 
#ifdef _MSC_VER
        #pragma warning(disable : 4748)
#endif
 
BOOL StackWalker::ShowCallstack(HANDLE hThread, const CONTEXT* context, PReadProcessMemoryRoutine readMemoryFunction, LPVOID pUserData)
{
        CONTEXT c;;
        CallstackEntry csEntry;
        IMAGEHLP_SYMBOL64* pSym = NULL;
        StackWalkerInternal::IMAGEHLP_MODULE64_V2 Module;
        IMAGEHLP_LINE64 Line;
        int frameNum;
 
        if (m_modulesLoaded == FALSE)
        {
                OnOutput("************* Loaded Modules *************");
                this->LoadModules();  // ignore the result...
                OnOutput("************* Callstack *************");
        }
 
        if (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
                if (hThread == GetCurrentThread())
                        GET_CURRENT_CONTEXT(c, USED_CONTEXT_FLAGS);
                else
                {
                        SuspendThread(hThread);
                        memset(&c, 0, sizeof(CONTEXT));
                        c.ContextFlags = USED_CONTEXT_FLAGS;
                        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;
#if defined(_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 defined(_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 defined(_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;
#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 suplied if imageTyp is IMAGE_FILE_MACHINE_I386!
                if (! m_sw->pSW(imageType, m_hProcess, hThread, &s, &c, myReadProcMem, m_sw->pSFTA, m_sw->pSGMB, NULL))
                {
                        this->OnDbgHelpErr("StackWalk64", GetLastError(), 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)
                {
                        this->OnDbgHelpErr("StackWalk64-Endless-Callstack!", 0, s.AddrPC.Offset);
                        break;
                }
                if (s.AddrPC.Offset != 0)
                {
                        // we seem to have a valid PC
                        // show procedure info (SymGetSymFromAddr64())
                        if (m_sw->pSGSFA(m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromSmybol), pSym) != FALSE)
                        {
                                strcpy_s(csEntry.name, pSym->Name);
                                // UnDecorateSymbolName()
                                m_sw->pUDSN(pSym->Name, csEntry.undName, STACKWALK_MAX_NAMELEN, UNDNAME_NAME_ONLY);
                                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 (m_sw->pSGLFA != NULL)
                        {
                                // yes, we have SymGetLineFromAddr64()
                                if (m_sw->pSGLFA(m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromLine), &Line) != FALSE)
                                {
                                        csEntry.lineNumber = Line.LineNumber;
                                        strcpy_s(csEntry.lineFileName, Line.FileName);
                                }
                                else
                                        this->OnDbgHelpErr("SymGetLineFromAddr64", GetLastError(), s.AddrPC.Offset);
                        } // yes, we have SymGetLineFromAddr64()
 
                        // show module info (SymGetModuleInfo64())
                        if (m_sw->GetModuleInfo(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 SymVirtual:
                                                csEntry.symTypeString = "Virtual";
                                                break;
                                        default:
                                                //_snprintf( ty, sizeof ty, "symtype=%ld", (long) Module.SymType );
                                                csEntry.symTypeString = NULL;
                                                break;
                                }
 
                                strcpy_s(csEntry.moduleName, Module.ModuleName);
                                csEntry.baseOfImage = Module.BaseOfImage;
                                strcpy_s(csEntry.loadedImageName, 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;
                this->OnCallstackEntry(et, csEntry);
 
                if (s.AddrReturn.Offset == 0)
                {
                        this->OnCallstackEntry(lastEntry, csEntry);
                        SetLastError(ERROR_SUCCESS);
                        break;
                }
        } // for ( frameNum )
 
cleanup:
        if (pSym)
                free(pSym);
 
        if (context == NULL)
                ResumeThread(hThread);
 
        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];
        if (fileVersion == 0)
                _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s'", 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, STACKWALK_MAX_NAMELEN, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s', fileVersion: %d.%d.%d.%d", img, mod, (LPVOID) baseAddr, size, result, symType, pdbName, v1, v2, v3, v4);
        }
        OnOutput(buffer);
}
 
void StackWalker::OnCallstackEntry(CallstackEntryType eType, CallstackEntry& entry)
{
        CHAR buffer[STACKWALK_MAX_NAMELEN];
        if ((eType != lastEntry) && (entry.offset != 0))
        {
                if (entry.name[0] == 0)
                        strcpy_s(entry.name, "(function-name not available)");
                if (entry.undName[0] != 0)
                        strcpy_s(entry.name, entry.undName);
                if (entry.undFullName[0] != 0)
                        strcpy_s(entry.name, entry.undFullName);
                if (entry.lineFileName[0] == 0)
                {
                        strcpy_s(entry.lineFileName, "(filename not available)");
                        if (entry.moduleName[0] == 0)
                                strcpy_s(entry.moduleName, "(module-name not available)");
                        _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%p (%s): %s: %s", (LPVOID) entry.offset, entry.moduleName, entry.lineFileName, entry.name);
                }
                else
                        _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s (%d): %s", entry.lineFileName, entry.lineNumber, entry.name);
                OnOutput(buffer);
        }
}
 
void StackWalker::OnDbgHelpErr(LPCSTR /*szFuncName*/, DWORD /*gle*/, DWORD64 /*addr*/)
{
        //CHAR buffer[STACKWALK_MAX_NAMELEN];
        //_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "ERROR: %s, GetLastError: %d (Address: %p)", szFuncName, gle, (LPVOID) addr);
        //OnOutput(buffer);
}
 
void StackWalker::OnSymInit(LPCSTR szSearchPath, DWORD symOptions, LPCSTR szUserName)
{
        CHAR buffer[STACKWALK_MAX_NAMELEN];
        _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "SymInit: Symbol-SearchPath: '%s', symOptions: %d, UserName: '%s'", szSearchPath, symOptions, szUserName);
        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, STACKWALK_MAX_NAMELEN, "OS-Version: %d.%d.%d (%s)",
                        ver.dwMajorVersion, ver.dwMinorVersion, ver.dwBuildNumber,
                        ver.szCSDVersion);
                OnOutput(buffer);
        }
#else
        OSVERSIONINFOEXA ver;
        ZeroMemory(&ver, sizeof(OSVERSIONINFOEXA));
        ver.dwOSVersionInfoSize = sizeof(ver);
#pragma warning(suppress: 4996)
        if (GetVersionExA((OSVERSIONINFOA*) &ver) != FALSE)
        {
                _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "OS-Version: %d.%d.%d (%s) 0x%x-0x%x",
                        ver.dwMajorVersion, ver.dwMinorVersion, ver.dwBuildNumber,
                        ver.szCSDVersion, ver.wSuiteMask, ver.wProductType);
                OnOutput(buffer);
        }
#endif
}
 
void StackWalker::OnOutput(LPCSTR /*buffer*/)
{
        //  OutputDebugStringA(buffer);
}
#endif