// Adapted from old version from http://stackwalker.codeplex.com/
// Newer version is now maintained at https://github.com/JochenKalmbach/StackWalker

/**********************************************************************
 *
 * 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!
 *
 **********************************************************************/

/**********************************************************************
 *
 * 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.
 *
 **********************************************************************/

#if !defined(_MSC_VER)

extern void StackWalker_dummy_function_to_avoid_linkage_warnings();
void StackWalker_dummy_function_to_avoid_linkage_warnings() {}

#else

#include "StackWalker.h"

#include <Windows.h>
#include <stdio.h>
#include <tchar.h>

#include <mutex>

#include "Hh.h"

HH_REFERENCE_LIB("version.lib");   // for "VerQueryValue"
HH_REFERENCE_LIB("advapi32.lib");  // for GetUserName() here and in StackWalker

namespace hh {

// To be able to obtain a valid stack trace after heap corruption, we override malloc()
// to use a statically allocated buffer.

#define malloc new_malloc
#define _strdup new_strdup
#define free new_free

namespace {

char local_malloc_buf[10 * 1000 * 1000];
char* pmalloc = local_malloc_buf;

void* new_malloc(size_t s) {
  char* ret = pmalloc;
  pmalloc += s;
  if (pmalloc > local_malloc_buf + sizeof(local_malloc_buf)) {
    std::cerr << "new_malloc overflow\n";
    _exit(1);
  }
  return ret;
}

char* new_strdup(const char* s) {
  char* ret = static_cast<char*>(new_malloc(strlen(s) + 1));
  strcpy(ret, s);  // NOLINT(clang-analyzer-security.insecureAPI.strcpy)
  return ret;
}
void new_free(void* /*unused*/) {}

const bool verbose = getenv_bool("STACKWALKER_VERBOSE");

}  // namespace

// If VC7 and later, then use the shipped 'dbghelp.h'-file
#if _MSC_VER >= 1300
#pragma warning(disable : 4091)  // C4091: 'typedef ': ignored on left of '' when no variable is declared
#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);
#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;
  }
  static void* operator new(size_t s) { return malloc(s); }
  static void operator delete(void*) {}

  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 (this->pSI(m_hProcess, m_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;

  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 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) return FALSE;

    keepGoing = !!pM32F(hSnap, &me);
    int cnt = 0;
    while (keepGoing) {
      this->LoadModule(hProcess, me.szExePath, me.szModule,
                       /*(DWORD64)*/ uintptr_t(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 = 0;
    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)*/ uintptr_t(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 retrive the file-version:
      if ((this->m_parent->m_options & StackWalker::RetrieveFileVersion) != 0) {
        VS_FIXEDFILEINFO* fInfo = NULL;
        DWORD dwHandle;
        DWORD dwSize = GetFileVersionInfoSizeA(szImg, &dwHandle);
        assertx(dwHandle == 0);
        HH_ASSUME(dwHandle == 0);
        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);
          }
        }
      }

      // Retrive 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 SymDia: szSymType = "DIA"; break;
          case SymVirtual: szSymType = "Virtual"; break;
          case NumSymTypes:
          default: abort();
        }
      }
      this->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 (this->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 (this->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) {
  this->m_options = OptionsAll;
  this->m_modulesLoaded = FALSE;
  this->m_hProcess = hProcess;
  this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
  this->m_dwProcessId = dwProcessId;
  this->m_szSymPath = NULL;
}

StackWalker::StackWalker(int options, LPCSTR szSymPath, DWORD dwProcessId, HANDLE hProcess) {
  this->m_options = options;
  this->m_modulesLoaded = FALSE;
  this->m_hProcess = hProcess;
  this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
  this->m_dwProcessId = dwProcessId;
  if (szSymPath != NULL) {
    this->m_szSymPath = _strdup(szSymPath);
    this->m_options |= SymBuildPath;
  } else
    this->m_szSymPath = NULL;
}

StackWalker::~StackWalker() {
  if (m_szSymPath != NULL) free(m_szSymPath);
  m_szSymPath = NULL;
  if (this->m_sw != NULL) delete this->m_sw;
  this->m_sw = NULL;
}

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 & 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 = 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;

#if defined(_MSC_VER)
#pragma warning(disable : 4740)  // flow in or out of inline asm code suppresses global optimization
#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) 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
    if (hThread == GetCurrentThread()) {
#pragma warning(disable : 4127)  // conditional expression is constant
      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;
#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;
#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);

  {
    static std::mutex mutex;
    std::lock_guard<std::mutex> lock(mutex);
    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 (!this->m_sw->pSW(imageType, this->m_hProcess, hThread, &s, &c, myReadProcMem, this->m_sw->pSFTA,
                           this->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 (this->m_sw->pSGSFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromSmybol), pSym) != FALSE) {
          // TODO: Mache dies sicher...!
          strcpy_s(csEntry.name, 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;
            // TODO: Mache dies sicher...!
            strcpy_s(csEntry.lineFileName, 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;
          }

          // TODO: Mache dies sicher...!
          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 = bRet ? (DWORD)st : 0;
    //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: %lu (result: %lu), 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, STACKWALK_MAX_NAMELEN,
                "%s:%s (%p), size: %lu (result: %lu), SymType: '%s', PDB: '%s', fileVersion: %lu.%lu.%lu.%lu\n", 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\n", (LPVOID)entry.offset, entry.moduleName,
                  entry.lineFileName, entry.name);
      if (!verbose) return;
    } else {
      //HH
      if (!verbose && strstr(entry.name, "hh::StackWalker::ShowCallstack")) return;
      if (!verbose && strstr(entry.name, "::show_call_stack")) return;  // hh::`anonymous namespace'::
      if (!verbose && strstr(entry.name, "hh::details::assertx_aux")) return;
      if (!verbose && strstr(entry.name, "hh::details::assertx_aux2")) return;
      if (!verbose && strstr(entry.name, "::my_top_level_exception_filter")) return;  // hh::`anonymous namespace'
      if (!verbose && strstr(entry.name, "CRTStartup")) return;                       // <=VS2013
      if (!verbose && strstr(entry.name, "__scrt_common_main_seh")) return;           // >=VS2015
      if (!verbose && strstr(entry.name, "crt\\vcstartup")) return;                   // VS2019
      // _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s (%d): %s\n", entry.lineFileName, entry.lineNumber, entry.name);
      _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s(%lu): %s\n", 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: %lu (Address: %p)\n", szFuncName, gle,
              (LPVOID)addr);
  if (verbose) 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: %lu, UserName: '%s'\n",
              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)\n", ver.dwMajorVersion, ver.dwMinorVersion,
                ver.dwBuildNumber, ver.szCSDVersion);
    OnOutput(buffer);
  }
#elif _MSC_VER >= 1800
  // deprecated
#else
  OSVERSIONINFOEXA ver;
  ZeroMemory(&ver, sizeof(OSVERSIONINFOEXA));
  ver.dwOSVersionInfoSize = sizeof(ver);
  if (GetVersionExA((OSVERSIONINFOA*)&ver) != FALSE) {
    _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "OS-Version: %d.%d.%d (%s) 0x%x-0x%x\n", ver.dwMajorVersion,
                ver.dwMinorVersion, ver.dwBuildNumber, ver.szCSDVersion, ver.wSuiteMask, ver.wProductType);
    OnOutput(buffer);
  }
#endif
}

void StackWalker::OnOutput(LPCSTR buffer) { OutputDebugStringA(buffer); }

}  // namespace hh

#endif  // defined(_MSC_VER)
