// Modifications for WZ:
//	2019-03-25 - Modified to always use RtlCaptureContext when possible

#ifndef __STACKWALKER_H__
#define __STACKWALKER_H__

#if defined(_MSC_VER)

/**********************************************************************
 *
 * StackWalker.h
 *
 *
 *
 * LICENSE (http://www.opensource.org/licenses/bsd-license.php)
 *
 *   Copyright (c) 2005-2009, Jochen Kalmbach
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without modification,
 *   are permitted provided that the following conditions are met:
 *
 *   Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *   Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *   Neither the name of Jochen Kalmbach nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 *   THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 *   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * **********************************************************************/
// #pragma once is supported starting with _MSC_VER 1000,
// so we need not to check the version (because we only support _MSC_VER >= 1100)!
#pragma once

#include <windows.h>

#if _MSC_VER >= 1900
#pragma warning(disable : 4091)
#endif

// special defines for VC5/6 (if no actual PSDK is installed):
#if _MSC_VER < 1300
typedef unsigned __int64 DWORD64, *PDWORD64;
#if defined(_WIN64)
typedef unsigned __int64 SIZE_T, *PSIZE_T;
#else
typedef unsigned long SIZE_T, *PSIZE_T;
#endif
#endif // _MSC_VER < 1300

class StackWalkerInternal; // forward
class StackWalker
{
public:
  typedef enum StackWalkOptions
  {
    // No addition info will be retrieved
    // (only the address is available)
    RetrieveNone = 0,

    // Try to get the symbol-name
    RetrieveSymbol = 1,

    // Try to get the line for this symbol
    RetrieveLine = 2,

    // Try to retrieve the module-infos
    RetrieveModuleInfo = 4,

    // Also retrieve the version for the DLL/EXE
    RetrieveFileVersion = 8,

    // Contains all the above
    RetrieveVerbose = 0xF,

    // Generate a "good" symbol-search-path
    SymBuildPath = 0x10,

    // Also use the public Microsoft-Symbol-Server
    SymUseSymSrv = 0x20,

    // Contains all the above "Sym"-options
    SymAll = 0x30,

    // Contains all options (default)
    OptionsAll = 0x3F
  } StackWalkOptions;

  StackWalker(int    options = OptionsAll, // 'int' is by design, to combine the enum-flags
              LPCSTR szSymPath = NULL,
              DWORD  dwProcessId = GetCurrentProcessId(),
              HANDLE hProcess = GetCurrentProcess());
  StackWalker(DWORD dwProcessId, HANDLE hProcess);
  virtual ~StackWalker();

  typedef BOOL(__stdcall* PReadProcessMemoryRoutine)(
      HANDLE  hProcess,
      DWORD64 qwBaseAddress,
      PVOID   lpBuffer,
      DWORD   nSize,
      LPDWORD lpNumberOfBytesRead,
      LPVOID  pUserData // optional data, which was passed in "ShowCallstack"
  );

  BOOL LoadModules();

  BOOL ShowCallstack(
      HANDLE                    hThread = GetCurrentThread(),
      const CONTEXT*            context = NULL,
      PReadProcessMemoryRoutine readMemoryFunction = NULL,
      LPVOID pUserData = NULL // optional to identify some data in the 'readMemoryFunction'-callback
  );

  BOOL ShowObject(LPVOID pObject);

#if _MSC_VER >= 1300
  // due to some reasons, the "STACKWALK_MAX_NAMELEN" must be declared as "public"
  // in older compilers in order to use it... starting with VC7 we can declare it as "protected"
protected:
#endif
  enum
  {
    STACKWALK_MAX_NAMELEN = 1024
  }; // max name length for found symbols

protected:
  // Entry for each Callstack-Entry
  typedef struct CallstackEntry
  {
    DWORD64 offset; // if 0, we have no valid entry
    CHAR    name[STACKWALK_MAX_NAMELEN];
    CHAR    undName[STACKWALK_MAX_NAMELEN];
    CHAR    undFullName[STACKWALK_MAX_NAMELEN];
    DWORD64 offsetFromSmybol;
    DWORD   offsetFromLine;
    DWORD   lineNumber;
    CHAR    lineFileName[STACKWALK_MAX_NAMELEN];
    DWORD   symType;
    LPCSTR  symTypeString;
    CHAR    moduleName[STACKWALK_MAX_NAMELEN];
    DWORD64 baseOfImage;
    CHAR    loadedImageName[STACKWALK_MAX_NAMELEN];
  } CallstackEntry;

  typedef enum CallstackEntryType
  {
    firstEntry,
    nextEntry,
    lastEntry
  } CallstackEntryType;

  virtual void OnSymInit(LPCSTR szSearchPath, DWORD symOptions, LPCSTR szUserName);
  virtual void OnLoadModule(LPCSTR    img,
                            LPCSTR    mod,
                            DWORD64   baseAddr,
                            DWORD     size,
                            DWORD     result,
                            LPCSTR    symType,
                            LPCSTR    pdbName,
                            ULONGLONG fileVersion);
  virtual void OnCallstackEntry(CallstackEntryType eType, CallstackEntry& entry);
  virtual void OnDbgHelpErr(LPCSTR szFuncName, DWORD gle, DWORD64 addr);
  virtual void OnOutput(LPCSTR szText);

  virtual void BeforeLoadModules(); // WZ
  virtual void BeforeShowCallstack(); // WZ

  StackWalkerInternal* m_sw;
  HANDLE               m_hProcess;
  DWORD                m_dwProcessId;
  BOOL                 m_modulesLoaded;
  LPSTR                m_szSymPath;

  int m_options;
  int m_MaxRecursionCount;

  static BOOL __stdcall myReadProcMem(HANDLE  hProcess,
                                      DWORD64 qwBaseAddress,
                                      PVOID   lpBuffer,
                                      DWORD   nSize,
                                      LPDWORD lpNumberOfBytesRead);

  friend StackWalkerInternal;
}; // class StackWalker

// The "ugly" assembler-implementation is needed for systems before XP
// If you have a new PSDK and you only compile for XP and later, then you can use
// the "RtlCaptureContext"
// Currently there is no define which determines the PSDK-Version...
// So we just use the compiler-version (and assumes that the PSDK is
// the one which was installed by the VS-IDE)

// INFO: If you want, you can use the RtlCaptureContext if you only target XP and later...
//       But I currently use it in x64/IA64 environments...
//#if defined(_M_IX86) && (_WIN32_WINNT <= 0x0500) && (_MSC_VER < 1400)

#if defined(_M_IX86) && (_WIN32_WINNT <= 0x0500) && (_MSC_VER < 1400) //#if defined(_M_IX86) // WZ
#ifdef CURRENT_THREAD_VIA_EXCEPTION
// TODO: The following is not a "good" implementation,
// because the callstack is only valid in the "__except" block...
#define GET_CURRENT_CONTEXT_STACKWALKER_CODEPLEX(c, contextFlags)               \
  do                                                                            \
  {                                                                             \
    memset(&c, 0, sizeof(CONTEXT));                                             \
    EXCEPTION_POINTERS* pExp = NULL;                                            \
    __try                                                                       \
    {                                                                           \
      throw 0;                                                                  \
    }                                                                           \
    __except (((pExp = GetExceptionInformation()) ? EXCEPTION_EXECUTE_HANDLER   \
                                                  : EXCEPTION_EXECUTE_HANDLER)) \
    {                                                                           \
    }                                                                           \
    if (pExp != NULL)                                                           \
      memcpy(&c, pExp->ContextRecord, sizeof(CONTEXT));                         \
    c.ContextFlags = contextFlags;                                              \
  } while (0);
#else
// clang-format off
// The following should be enough for walking the callstack...
#define GET_CURRENT_CONTEXT_STACKWALKER_CODEPLEX(c, contextFlags) \
  do                                                              \
  {                                                               \
    memset(&c, 0, sizeof(CONTEXT));                               \
    c.ContextFlags = contextFlags;                                \
    __asm    call x                                               \
    __asm x: pop eax                                              \
    __asm    mov c.Eip, eax                                       \
    __asm    mov c.Ebp, ebp                                       \
    __asm    mov c.Esp, esp                                       \
  } while (0)
// clang-format on
#endif

#else

// The following is defined for x86 (XP and higher), x64 and IA64:
#define GET_CURRENT_CONTEXT_STACKWALKER_CODEPLEX(c, contextFlags) \
  do                                                              \
  {                                                               \
    memset(&c, 0, sizeof(CONTEXT));                               \
    c.ContextFlags = contextFlags;                                \
    RtlCaptureContext(&c);                                        \
  } while (0);
#endif

#endif //defined(_MSC_VER)

#endif // __STACKWALKER_H__
