//{$DEFINE ASM_VERSION}
//{$DEFINE VARIANT_USED}

{$IFDEF ASM_VERSION}
  {$IFDEF PAS_VERSION}
    {$UNDEF ASM_VERSION}
  {$ENDIF}
{$ENDIF}

{=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

        KKKKK    KKKKK    OOOOOOOOO    LLLLL
        KKKKK    KKKKK  OOOOOOOOOOOOO  LLLLL
        KKKKK    KKKKK  OOOOO   OOOOO  LLLLL
        KKKKK  KKKKK    OOOOO   OOOOO  LLLLL
        KKKKKKKKKK      OOOOO   OOOOO  LLLLL
        KKKKK  KKKKK    OOOOO   OOOOO  LLLLL
        KKKKK    KKKKK  OOOOO   OOOOO  LLLLL
        KKKKK    KKKKK  OOOOOOOOOOOOO  LLLLLLLLLLLLL
        KKKKK    KKKKK    OOOOOOOOO    LLLLLLLLLLLLL

  Key Objects Library (C) 2000 by Kladov Vladimir.

  mailto: bonanzas@xcl.cjb.net
  Home: http://kol.nm.ru
        http://xcl.cjb.net
        http://xcl.nm.ru

 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-}
{
  This code is grabbed mainly from standard SysUtils.pas unit,
  provided by Borland Delphi. This unit is for handling exceptions,
  and to use it just place a reference to exceptions unit in
  uses clause of any of your unit or dpr-file.
}

{       Copyright (C) 1995,99 Inprise Corporation       }
{       Copyright (C) 2001, Kladov Vladimir             }

unit err;
{* Unit to provide error handling for KOL programs using efficient
   exceptions mechanism. To use it, just place a reference to it into
   uses clause of any unit of the project (or dpr-file).
   |<br><br>
   It is possible to use standard SysUtils instead, but it increases
   size of executable at least by 10K. Using this unit to handle exceptions
   increases executable only by 6,5K.
}

interface

uses Windows, KOL;

{$I KOLDEF.INC}
{$IFDEF _D6orHigher}
  {$WARN SYMBOL_DEPRECATED OFF}
{$ENDIF}
{$IFDEF _D7orHigher}
  {$WARN UNSAFE_TYPE OFF}
  {$WARN UNSAFE_CODE OFF}
{$ENDIF}

{+} // These resource strings are grabbed from SysConst and changed a bit to make it smaller.

//{$DEFINE USE_RESOURCESTRING}
{$IFDEF _D2orD3}
  {$IFDEF USE_RESOURCESTRING}
    {$UNDEF USE_RESOURCESTRING}
  {$ENDIF}
{$ENDIF}

{$IFDEF _D2orD3}
type
  LongWord = DWORD;
{$ENDIF}
{$IFNDEF USE_RESOURCESTRING}
const
{$ELSE}
resourcestring
{$ENDIF}
  SUnknown = '<unknown>';
  //SInvalidInteger = '''%s'' is not a valid integer value';
  //SInvalidFloat = '''%s'' is not a valid floating point value';
  //SInvalidDate = '''%s'' is not a valid date';
  //SInvalidTime = '''%s'' is not a valid time';
  //SInvalidDateTime = '''%s'' is not a valid date and time';
  //STimeEncodeError = 'Invalid argument to time encode';
  //SDateEncodeError = 'Invalid argument to date encode';
  SOutOfMemory = 'Out of memory';
  SInOutError = 'I/O error %d';
  SFileNotFound = 'File not found';
  SInvalidFilename = 'Invalid filename';
  STooManyOpenFiles = 'Too many open files';
  SAccessDenied = 'File access denied';
  SEndOfFile = //'Read beyond end of file';
               'End of file';
  SDiskFull = 'Disk full';
  //SInvalidInput = 'Invalid numeric input'; // {-} Seems for console input only
  SDivByZero = 'Division by zero';
  SRangeError = 'Range check error';
  SIntOverflow = 'Integer overflow';
  SInvalidOp = 'Invalid floating point operation';
  SZeroDivide = 'Floating point division by zero';
  SOverflow = 'Floating point overflow';
  SUnderflow = 'Floating point underflow';
  SInvalidPointer = 'Invalid pointer operation';
  SInvalidCast = 'Invalid class typecast';
  SAccessViolation = 'Access violation at address %p. %s of address %p';
  SStackOverflow = 'Stack overflow';
  SControlC = //'Control-C hit';
              '^C'; // {-} for console applications only
  SPrivilege = 'Privileged instruction';
  SOperationAborted = 'Operation aborted';
  SException = 'Exception %s in module %s at %p.'#10'%s%s';
  //SExceptTitle = 'Application Error';
  //SInvalidFormat = 'Format ''%s'' invalid or incompatible with argument';
  //SArgumentMissing = 'No argument for format ''%s''';
  SInvalidVarCast = 'Invalid variant type conversion';
  SInvalidVarOp = 'Invalid variant operation';
  SDispatchError = 'Variant method calls not supported';
  SVarArrayCreate = 'Error creating variant array';
  SVarNotArray = 'Variant is not an array';
  SVarArrayBounds = 'Variant array index out of bounds';
  SVar = 'EVariant';
  SReadAccess = 'Read';
  SWriteAccess = 'Write';
  //SResultTooLong = 'Format result longer than 4096 characters';
  //SFormatTooLong = 'Format string too long';
  SExternalException = 'External exception %x';
  SAssertionFailed = 'Assertion failed';
  SIntfCastError = 'Interface not supported';
  SSafecallException = 'Exception in safecall method';
  SAssertError = '%s (%s, line %d)';
  SAbstractError = 'Abstract Error';
  SModuleAccessViolation = 'Access violation at address %p in module ''%s''. %s of address %p';
  {SCannotReadPackageInfo = 'Cannot access package information for package ''%s''';
  sErrorLoadingPackage = 'Can''t load package %s.'#13#10'%s';
  SInvalidPackageFile = 'Invalid package file ''%s''';
  SInvalidPackageHandle = 'Invalid package handle';
  SDuplicatePackageUnit = 'Cannot load package ''%s.''  It contains unit ''%s,''' +
    ';which is also contained in package ''%s''';}
  SWin32Error = 'Win32 Error.  Code: %d.'#10'%s';
  SUnkWin32Error = 'A Win32 API function failed';
  SNL = 'Application is not licensed to use this feature';
{-}

type

{ Generic procedure pointer }

  TProcedure = procedure;

{ Generic filename type }

  TFileName = type string;

{ Exceptions }
  Exception = class;
  TDestroyException = procedure( Sender: Exception ) of object;

  TError = ( e_Abort, e_Heap, e_OutOfMem, e_InOut, e_External, e_Int,
             e_DivBy0, e_Range, e_IntOverflow, e_Math, e_Math_InvalidArgument,
             e_InvalidOp, e_ZeroDivide, e_Overflow, e_Underflow, e_InvalidPointer,
             e_InvalidCast, e_Convert, e_AccessViolation, e_Privilege,
             e_StackOverflow, e_CtrlC, e_Variant, e_PropReadOnly,
             e_PropWriteOnly, e_Assertion, e_Abstract, e_IntfCast,
             e_InvalidContainer, e_InvalidInsert, e_Package, e_Win32,
             e_SafeCall, e_License, e_Custom, e_Com, e_Ole, e_Registry );
  {* Main error codes. These are to determine which exception occure. You
     can use e_Custom code for your own exceptions. }

  Exception = class(TObject)
  {* Exception class. In KOL, there is a single exception class is used.
     Instead of inheriting new exception classes from this ancestor, an
     instance of the same Exception class should be used. The difference
     is only in Code property, which contains a kind of exception.  }
  protected
    FCode: TError;
    FErrorCode: DWORD;
    FMessage: KOLString;
    FExceptionRecord: PExceptionRecord;
    FData: Pointer;
    FOnDestroy: TDestroyException;
    procedure SetData(const Value: Pointer);
  public
    constructor Create(ACode: TError; const Msg: string);
    {* Use this constructor to raise exception, which does not require of
       argument formatting. }
    constructor CreateFmt(ACode: TError; const Msg: string; const Args: array of const);
    {* Use this constructor to raise an exception with formatted Message string.
       Take into attention, that Format procedure defined in KOL, uses API wvsprintf
       function, which can understand a restricted set of format specifications. }
    constructor CreateCustom(AError: DWORD; const Msg: String);
    {* Use this constructor to create e_Custom exception and to assign AError to
       its ErrorCode property. }
    constructor CreateCustomFmt(AError: DWORD; const Msg: String; const Args: array of const);
    {* Use this constructor to create e_Custom exception with formatted message
       string and to assign AError to its ErrorCode property. }
    constructor CreateResFmt(ACode: TError; Ident: Integer; const Args: array of const);
    {* }    
    destructor Destroy; override;
    {* destructor }
    property Message: KOLString read FMessage; // write FMessage;
    {* Text string, containing descriptive message about the exception. }
    property Code: TError read FCode;
    {* Main exception code. This property can be used to determine, which exception
       occure. }
    property ErrorCode: DWORD read FErrorCode write FErrorCode;
    {* This code is to detailize error. For Code = e_InOut, ErrorCode contains
       more detail description of input/output error. For e_Custom, You can
       assign it to any value You want. }
    property ExceptionRecord: PExceptionRecord read FExceptionRecord;
    {* This property is only for e_External exception. }
    property Data: Pointer read FData write SetData;
    {* Custom defined pointer. Use it in your custom exceptions. }
    property OnDestroy: TDestroyException read FOnDestroy write FOnDestroy;
    {* This event is to allow to do something when custom Exception is
       released. }
  end;
  {*
    With err unit, it is possible to use all capabilities of Delphi exception
    handling almost in the same way as usual. The difference only in that the
    single exception class should be used. To determine which exception occure,
    use property Code. So, code to handle exception can be written like follow:
    ! try
    ! ...
    ! except on E: Exception do
    !   case E.Code of
    !   e_DivBy0: HandleDivideByZero;
    !   e_Overflow: HandleOverflow;
    !   ...
    !   end;
    ! end;
    To raise an error, create an instance of Exception class object, but
    pass a Code to its constructor:
    ! var E: Exception;
    ! ...
    ! E := Exception.Create( e_Custom, 'My custom exception' );
    ! E.ErrorCode := MY_MAGIC_CODE_FOR_CUSTOM_EXCEPTION;
    ! raise E;
  }

  ExceptClass = class of Exception;

{ Exit procedure handling }

{ AddExitProc adds the given procedure to the run-time library's exit
  procedure list. When an application terminates, its exit procedures are
  executed in reverse order of definition, i.e. the last procedure passed
  to AddExitProc is the first one to get executed upon termination. }

procedure AddExitProc(Proc: TProcedure);

{ System error messages }

function SysErrorMessage(ErrorCode: Integer): string;

{ Exception handling routines }

function ExceptObject: TObject;
function ExceptAddr: Pointer;

function ExceptionErrorMessage(ExceptObject: TObject; ExceptAddr: Pointer;
  Buffer: PKOLChar; Size: Integer): Integer;

procedure ShowException(ExceptObject: TObject; ExceptAddr: Pointer);

procedure Abort;

//procedure OutOfMemoryError;

{ RaiseLastWin32Error calls the GetLastError API to retrieve the code for }
{ the last occuring Win32 error.  If GetLastError returns an error code,  }
{ RaiseLastWin32Error then raises an exception with the error code and    }
{ message associated with with error. }

procedure RaiseLastWin32Error;

{ Win32Check is used to check the return value of a Win32 API function     }
{ which returns a BOOL to indicate success.  If the Win32 API function     }
{ returns False (indicating failure), Win32Check calls RaiseLastWin32Error }
{ to raise an exception.  If the Win32 API function returns True,          }
{ Win32Check returns True. }

function Win32Check(RetVal: BOOL): BOOL;

{ Termination procedure support }

type
  TTerminateProc = function: Boolean;

{ Call AddTerminateProc to add a terminate procedure to the system list of }
{ termination procedures.  Delphi will call all of the function in the     }
{ termination procedure list before an application terminates.  The user-  }
{ defined TermProc function should return True if the application can      }
{ safely terminate or False if the application cannot safely terminate.    }
{ If one of the functions in the termination procedure list returns False, }
{ the application will not terminate. }

procedure AddTerminateProc(TermProc: TTerminateProc);

{ CallTerminateProcs is called by VCL when an application is about to }
{ terminate.  It returns True only if all of the functions in the     }
{ system's terminate procedure list return True.  This function is    }
{ intended only to be called by Delphi, and it should not be called   }
{ directly. }

function CallTerminateProcs: Boolean;

{$IFNDEF _D2}
function GDAL: LongWord;
procedure RCS;
procedure RPR;
{$ENDIF}


{ SafeLoadLibrary calls LoadLibrary, disabling normal Win32 error message
  popup dialogs if the requested file can't be loaded.  SafeLoadLibrary also
  preserves the current FPU control word (precision, exception masks) across
  the LoadLibrary call (in case the DLL you're loading hammers the FPU control
  word in its initialization, as many MS DLLs do)}

{$IFNDEF _D2orD3}
function SafeLoadLibrary(const Filename: KOLString;
  ErrorMode: UINT = SEM_NOOPENFILEERRORBOX): HMODULE;
{$ENDIF}

implementation

{procedure ConvertError(const Ident: string);
begin
  raise Exception.Create(e_Convert, Ident);
end;

procedure ConvertErrorFmt(ResString: PResStringRec; const Args: array of const);
begin
  raise Exception.CreateFmt(e_Convert, LoadResString(ResString), Args);
end;}

{ Memory management routines }

function AllocMem(Size: Cardinal): Pointer;
begin
  GetMem(Result, Size);
  FillChar(Result^, Size, 0);
end;

{ Exit procedure handling }

type
  PExitProcInfo = ^TExitProcInfo;
  TExitProcInfo = record
    Next: PExitProcInfo;
    SaveExit: Pointer;
    Proc: TProcedure;
  end;

var
  ExitProcList: PExitProcInfo = nil;

procedure DoExitProc;
var
  P: PExitProcInfo;
  Proc: TProcedure;
begin
  P := ExitProcList;
  ExitProcList := P^.Next;
  ExitProc := P^.SaveExit;
  Proc := P^.Proc;
  Dispose(P);
  Proc;
end;

procedure AddExitProc(Proc: TProcedure);
var
  P: PExitProcInfo;
begin
  New(P);
  P^.Next := ExitProcList;
  P^.SaveExit := ExitProc;
  P^.Proc := Proc;
  ExitProcList := P;
  ExitProc := @DoExitProc;
end;

{ System error messages }

function SysErrorMessage(ErrorCode: Integer): string;
var
  Len: Integer;
  Buffer: array[0..255] of KOLChar;
begin
  Len := FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM or
    FORMAT_MESSAGE_ARGUMENT_ARRAY, nil, ErrorCode, 0, Buffer,
    SizeOf(Buffer), nil);
  while (Len > 0) and ((Buffer[Len - 1] <= ' ') or
                       (Buffer[Len - 1] = '.')) do Dec(Len);
  SetString(Result, Buffer, Len);
end;

{ Exception handling routines }

{var
  OutOfMemory: EOutOfMemory;
  InvalidPointer: EInvalidPointer;}

type
  PRaiseFrame = ^TRaiseFrame;
  TRaiseFrame = record
    NextRaise: PRaiseFrame;
    ExceptAddr: Pointer;
    ExceptObject: TObject;
    ExceptionRecord: PExceptionRecord;
  end;

{ Return current exception object }

function ExceptObject: TObject;
begin
  if RaiseList <> nil then
    Result := PRaiseFrame(RaiseList)^.ExceptObject else
    Result := nil;
end;

{ Return current exception address }

function ExceptAddr: Pointer;
begin
  if RaiseList <> nil then
    Result := PRaiseFrame(RaiseList)^.ExceptAddr else
    Result := nil;
end;

{ Convert physical address to logical address }

function ConvertAddr(Address: Pointer): Pointer; assembler;
asm
        TEST    EAX,EAX         { Always convert nil to nil }
        JE      @@1
        SUB     EAX, $1000      { offset from code start; code start set by linker to $1000 }
@@1:
end;

{ Format and return an exception error message }

{$IFDEF _D2} // this code is luck in D2 system.pas
{type
  PLibModule = ^TLibModule;
  TLibModule = record
    Next: PLibModule;
    Instance: Longint;
    ResInstance: Longint;
    Reserved: Integer;
  end;}

function FindResourceHInstance(Instance: Longint): Longint;
begin
  Result := Instance;
end;
{$ENDIF}

type
  PStrData = ^TStrData;
  TStrData = record
    Ident: Integer;
    Buffer: PKOLChar;
    BufSize: Integer;
    nChars: Integer;
  end;

function EnumStringModules(Instance: THANDLE; Data: Pointer): Boolean;
begin
  with PStrData(Data)^ do
  begin
    nChars := LoadString(Instance, Ident, Buffer, BufSize);
    Result := nChars = 0;
  end;
end;

{$IFNDEF _D2}
function FindStringResource(Ident: Integer; Buffer: PKOLChar; BufSize: Integer): Integer;
var
  StrData: TStrData;
begin
  StrData.Ident := Ident;
  StrData.Buffer := Buffer;
  StrData.BufSize := BufSize;
  StrData.nChars := 0;
  EnumResourceModules(EnumStringModules, @StrData);
  Result := StrData.nChars;
end;
{$ENDIF}

{$IFDEF _D2}
function LoadStr(Ident: Integer): string;
var
  Buffer: array[0..1023] of Char;
begin
  SetString(Result, Buffer, LoadString(HInstance, Ident, Buffer,
    SizeOf(Buffer)));
end;
{$ELSE}
function LoadStr(Ident: Integer): string;
var
  Buffer: array[0..1023] of KOLChar;
begin
  SetString(Result, Buffer, FindStringResource(Ident, Buffer, SizeOf(Buffer)));
end;
{$ENDIF}

function FmtLoadStr(Ident: Integer; const Args: array of const): string;
begin
  //FmtStr(Result, LoadStr(Ident), Args);
  Result := Format(LoadStr(Ident), Args);
end;

function ExceptionErrorMessage(ExceptObject: TObject; ExceptAddr: Pointer;
  Buffer: PKOLChar; Size: Integer): Integer;
var
  ex: Exception;
  MsgPtr: PKOLChar;
  //MsgEnd: PChar;
  //MsgLen: Integer;
  ModuleName: array[0..MAX_PATH] of KOLChar;
  //Temp: array[0..MAX_PATH] of Char;
  Fmt: array[0..255] of KOLChar;
  Info: TMemoryBasicInformation;
  ConvertedAddress: Pointer;
begin
  VirtualQuery(ExceptAddr, Info, sizeof(Info));
  if (Info.State <> MEM_COMMIT) or
    (GetModuleFilename( THandle(Info.AllocationBase), {Temp} ModuleName,
                        SizeOf({Temp} ModuleName)) = 0) then
  begin
    GetModuleFileName(HInstance, {Temp} ModuleName, SizeOf({Temp} ModuleName));
    ConvertedAddress := ConvertAddr(ExceptAddr);
  end
  else
    Integer(ConvertedAddress) := Integer(ExceptAddr) - Integer(Info.AllocationBase);
  //StrLCopy(ModuleName, AnsiStrRScan(Temp, '\') + 1, SizeOf(ModuleName) - 1);
  {-} // Why to extract unit name from a path? Isn't it well to show complete path
      // and to economy code for the extraction.
  MsgPtr := '';
  //MsgEnd := '';
  if ExceptObject is Exception then
  begin
    ex := Exception(ExceptObject);
    MsgPtr := PKOLChar(ex.Message);
    //MsgLen := StrLen(MsgPtr);
    //if (MsgLen <> 0) and (MsgPtr[MsgLen - 1] <> '.') then MsgEnd := '.';
    {-} // Isn't it too beautiful - devote ~40 bytes of code just to decide,
        // add or not a point at the end of the message.
  end;
  {$IFNDEF USE_RESOURCESTRING}
  {$IFDEF UNICODE_CTRLS} WStrCopy {$ELSE} StrCopy {$ENDIF}( Fmt, SException );
  {$ELSE}
  LoadString(FindResourceHInstance(HInstance),
    PResStringRec(@SException).Identifier, Fmt, SizeOf(Fmt));
  {$ENDIF}
  //MsgOK( ModuleName );
  {$IFDEF UNICODE_CTRLS} WStrCopy {$ELSE} StrCopy {$ENDIF}
    ( Buffer, PKOLChar( Format( Fmt, [ ExceptObject.ClassName,
      ModuleName, ConvertedAddress, MsgPtr, '' {MsgEnd}]) ) );
  Result := {$IFDEF UNICODE_CTRLS} WStrLen {$ELSE} StrLen {$ENDIF}(Buffer);
end;

{ Display exception message box }

procedure ShowException(ExceptObject: TObject; ExceptAddr: Pointer);
var
  Buffer: array[0..1023] of KOLChar;
begin
  ExceptionErrorMessage(ExceptObject, ExceptAddr, Buffer, SizeOf(Buffer));
  {if IsConsole then
    WriteLn(Buffer)
  else}
  begin
    {LoadString(FindResourceHInstance(HInstance), PResStringRec(@SExceptTitle).Identifier,
      Title, SizeOf(Title));}
    MessageBox(0, Buffer, {Title} nil, MB_OK {or MB_ICONSTOP} or MB_SYSTEMMODAL);
  end;
end;

{ Raise abort exception }

procedure Abort;

  function ReturnAddr: Pointer;
  asm
//          MOV     EAX,[ESP + 4] !!! codegen dependant
          MOV     EAX,[EBP - 4]
  end;

begin
  raise Exception.Create(e_Abort, SOperationAborted) at ReturnAddr;
end;

{ Raise out of memory exception }

{procedure OutOfMemoryError;
begin
  raise OutOfMemory;
end;}

{ Exception class }

constructor Exception.CreateResFmt(ACode: TError; Ident: Integer;
  const Args: array of const);
begin
  FMessage := Format(LoadStr(Ident), Args);
end;

destructor Exception.Destroy;
begin
  if Assigned( FOnDestroy ) then
    FOnDestroy( Self );
  inherited;
end;

procedure Exception.SetData(const Value: Pointer);
begin
  FData := Value;
end;

constructor Exception.Create(ACode: TError; const Msg: string);
begin
  FCode := ACode;
  FMessage := Msg;
  //FAllowFree := TRUE;
end;

constructor Exception.CreateCustom(AError: DWORD; const Msg: String);
begin
  FCode := e_Custom;
  FMessage := Msg;
  FErrorCode := AError;
end;

constructor Exception.CreateCustomFmt(AError: DWORD; const Msg: String;
  const Args: array of const);
begin
  FCode := e_Custom;
  FErrorCode := AError;
  FMessage := Format(Msg, Args);
end;

constructor Exception.CreateFmt(ACode: TError; const Msg: string;
  const Args: array of const);
begin
  FCode := ACode;
  FMessage := Format(Msg, Args);
end;

{ EHeapException class }

{procedure EHeapException.FreeInstance;
begin
  if AllowFree then
    inherited FreeInstance;
end;}

{ Create I/O exception }

function CreateInOutError: Exception;
type
  TErrorRec = record
    Code: Integer;
    Ident: string;
  end;
const
  ErrorMap: array[0..5] of TErrorRec = (
    (Code: 2; Ident: SFileNotFound),
    (Code: 3; Ident: SInvalidFilename),
    (Code: 4; Ident: STooManyOpenFiles),
    (Code: 5; Ident: SAccessDenied),
    (Code: 100; Ident: SEndOfFile),
    (Code: 101; Ident: SDiskFull){,
    (Code: 106; Ident: SInvalidInput)} );
var
  I: Integer;
  InOutRes: Integer;
begin
  I := Low(ErrorMap);
  InOutRes := IOResult;  // resets IOResult to zero
  while (I <= High(ErrorMap)) and (ErrorMap[I].Code <> InOutRes) do Inc(I);
  if I <= High(ErrorMap) then
    Result := Exception.Create(e_InOut, ErrorMap[I].Ident)
  else
    Result := Exception.CreateFmt(e_InOut, SInOutError, [InOutRes]);
    //Result := Exception.Create(e_InOut, SInOutError + Int2Str( InOutRes ) );
  Result.ErrorCode := InOutRes;
end;

{ RTL error handler }

type
  TExceptMapRec = packed record
    ECode: TError;
    EIdent: String;
  end;

const
  ExceptMap: array[1..24] of TExceptMapRec = (
    (ECode: e_OutOfMem;       EIdent: SOutOfMemory),
    (ECode: e_InvalidPointer; EIdent: SInvalidPointer),
    (ECode: e_DivBy0;         EIdent: SDivByZero),
    (ECode: e_Range;          EIdent: SRangeError),
    (ECode: e_IntOverflow;    EIdent: SIntOverflow),
    (ECode: e_InvalidOp;      EIdent: SInvalidOp),
    (ECode: e_ZeroDivide;     EIdent: SDivByZero),
    (ECode: e_Overflow;       EIdent: SOverflow),
    (ECode: e_Underflow;      EIdent: SUnderflow),
    (ECode: e_InvalidCast;    EIdent: SInvalidCast),
    (ECode: e_AccessViolation;EIdent: SAccessViolation),
    (ECode: e_Privilege;      EIdent: SPrivilege),
    (ECode: e_CtrlC;          EIdent: SControlC),
             // {-} Only for console applications
    (ECode: e_StackOverflow;  EIdent: SStackOverflow),
    {$IFDEF VARIANT_USED}
    (ECode: e_Variant;        EIdent: SInvalidVarCast),
    (ECode: e_Variant;        EIdent: SInvalidVarOp),
    (ECode: e_Variant;        EIdent: SDispatchError),
    (ECode: e_Variant;        EIdent: SVarArrayCreate),
    (ECode: e_Variant;        EIdent: SVarNotArray),
    (ECode: e_Variant;        EIdent: SVarArrayBounds),
    {$ELSE}
    (ECode: e_Variant;        EIdent: SVar),
    (ECode: e_Variant;        EIdent: SVar),
    (ECode: e_Variant;        EIdent: SVar),
    (ECode: e_Variant;        EIdent: SVar),
    (ECode: e_Variant;        EIdent: SVar),
    (ECode: e_Variant;        EIdent: SVar),
    {$ENDIF}
    (ECode: e_Assertion;      EIdent: SAssertionFailed),
    (ECode: e_External;       EIdent: SExternalException),
    (ECode: e_IntfCast;       EIdent: SIntfCastError),
    (ECode: e_SafeCall;       EIdent: SSafecallException));

procedure ErrorHandler(ErrorCode: Integer; ErrorAddr: Pointer);
var
  E: Exception;
begin
  {case ErrorCode of
    1: E := OutOfMemory;
    2: E := InvalidPointer;
    3..24: with ExceptMap[ErrorCode] do E := EClass.Create(EIdent);
  else
    E := CreateInOutError;
  end;}

  { + }
  if ErrorCode <= 24 then
    with ExceptMap[ErrorCode] do E := Exception.Create(ECode, EIdent)
  else E := CreateInOutError;
  { - }

  raise E at ErrorAddr;
end;

{ Assertion error handler }

{ This is complicated by the desire to make it look like the exception     }
{ happened in the user routine, so the debugger can give a decent stack    }
{ trace. To make that feasible, AssertErrorHandler calls a helper function }
{ to create the exception object, so that AssertErrorHandler itself does   }
{ not need any temps. After the exception object is created, the asm       }
{ routine RaiseAssertException sets up the registers just as if the user   }
{ code itself had raised the exception.                                    }

function CreateAssertException(const Message, Filename: string;
  LineNumber: Integer): Exception;
var
  S: string;
begin
  if Message <> '' then S := Message else S := SAssertionFailed;
  Result := Exception.CreateFmt(e_Assertion, SAssertError,
         [S, Filename, LineNumber]);
end;

{ This code is based on the following assumptions:                         }
{  - Our direct caller (AssertErrorHandler) has an EBP frame               }
{  - ErrorStack points to where the return address would be if the         }
{    user program had called System.@RaiseExcept directly                  }
procedure RaiseAssertException(const E: Exception; const ErrorAddr, ErrorStack: Pointer);
asm
        MOV     ESP,ECX
        MOV     [ESP],EDX
        MOV     EBP,[EBP]
        JMP     System.@RaiseExcept
end;

{ If you change this procedure, make sure it does not have any local variables }
{ or temps that need cleanup - they won't get cleaned up due to the way        }
{ RaiseAssertException frame works. Also, it can not have an exception frame.  }
procedure AssertErrorHandler(const Message, Filename: string;
  LineNumber: Integer; ErrorAddr: Pointer);
var
  E: Exception;
begin
   E := CreateAssertException(Message, Filename, LineNumber);
   RaiseAssertException(E, ErrorAddr, PChar(@ErrorAddr)+4);
end;

{ Abstract method invoke error handler }

procedure AbstractErrorHandler;
begin
  raise Exception.Create(e_Abstract, SAbstractError);
end;

{$IFDEF ASM_VERSION}
function MapException(P: PExceptionRecord): Byte;
asm     //cmd    //opd
        MOV      EAX, [EAX].TExceptionRecord.ExceptionCode
        SUB      EAX, $C0000000
        CMP      EAX, $FD
        JA       @@code22

        XOR      ECX, ECX
        MOV      EDX, offset @@cvTable - 1
@@loo:
        INC      EDX
        MOV      CL, [EDX]
        JECXZ    @@code22
        INC      EDX
        CMP      AL, [EDX]
        JNE      @@loo

        MOV      AL, CL
        RET

@@cvTable:
        DB       3, $94
        DB       4, $8C
        DB       5, $95
        DB       6, $8F, 6, $90, 6, $92
        DB       7, $8E
        DB       8, $91
        DB       9, $8D, 9, $93
        DB       11, $05
        DB       12, $96
        DB       14, $FD
        DB       0

@@code22:
        MOV      AL, 22
end;
{$ELSE} //Pascal
function MapException(P: PExceptionRecord): Byte;
begin
  case P.ExceptionCode of
    STATUS_INTEGER_DIVIDE_BY_ZERO:
      Result := 3;
    STATUS_ARRAY_BOUNDS_EXCEEDED:
      Result := 4;
    STATUS_INTEGER_OVERFLOW:
      Result := 5;
    STATUS_FLOAT_INEXACT_RESULT,
    STATUS_FLOAT_INVALID_OPERATION,
    STATUS_FLOAT_STACK_CHECK:
      Result := 6;
    STATUS_FLOAT_DIVIDE_BY_ZERO:
      Result := 7;
    STATUS_FLOAT_OVERFLOW:
      Result := 8;
    STATUS_FLOAT_UNDERFLOW,
    STATUS_FLOAT_DENORMAL_OPERAND:
      Result := 9;
    STATUS_ACCESS_VIOLATION:
      Result := 11;
    STATUS_PRIVILEGED_INSTRUCTION:
      Result := 12;
    STATUS_CONTROL_C_EXIT:
      Result := 13;
    STATUS_STACK_OVERFLOW:
      Result := 14;
  else
    Result := 22; { must match System.reExternalException }
  end;
end;
{$ENDIF}

function GetExceptionClass(P: PExceptionRecord): ExceptClass;
//var ErrorCode: Byte;
begin
  //ErrorCode := MapException(P);
  Result := Exception; {ExceptMap[ErrorCode].EClass;}
end;

function GetExceptionObject(P: PExceptionRecord): Exception;
var
  ErrorCode: Integer;

  function CreateAVObject: Exception;
  var
    AccessOp: string; // string ID indicating the access type READ or WRITE
    AccessAddress: Pointer;
    MemInfo: TMemoryBasicInformation;
    ModName: array[0..MAX_PATH] of KOLChar;
  begin
    with P^ do
    begin
      if ExceptionInformation[0] = 0 then
        AccessOp := SReadAccess else
        AccessOp := SWriteAccess;
      AccessAddress := Pointer(ExceptionInformation[1]);
      VirtualQuery(ExceptionAddress, MemInfo, SizeOf(MemInfo));
      if (MemInfo.State = MEM_COMMIT) and (GetModuleFileName(THandle(MemInfo.AllocationBase),
        ModName, SizeOf(ModName)) <> 0) then
        Result := Exception.CreateFmt(e_AccessViolation, sModuleAccessViolation,
          [ExceptionAddress, ExtractFileName(ModName), AccessOp,
          AccessAddress])
      else Result := Exception.CreateFmt(e_AccessViolation, sAccessViolation,
          [ExceptionAddress, AccessOp, AccessAddress]);
    end;
  end;

begin
  ErrorCode := MapException(P);
  case ErrorCode of
    3..10, 12..21:
      with ExceptMap[ErrorCode] do Result := Exception.Create(ECode, EIdent);
    11: Result := CreateAVObject;
  else
    begin
      Result := Exception.CreateFmt(e_External, SExternalException, [P.ExceptionCode]);
      //Result.FExceptionRecord := P;
    end;
  end;
  Result.FExceptionRecord := P;
end;

{ RTL exception handler }

procedure ExceptHandler(ExceptObject: TObject; ExceptAddr: Pointer); far;
begin
  ShowException(ExceptObject, ExceptAddr);
  Halt(1);
end;

{+}
function InitAssertErrorProc: Boolean;
begin
  AssertErrorProc := @AssertErrorHandler;
  Result := TRUE;
end;
{-}

procedure InitExceptions;
begin
  {OutOfMemory := EOutOfMemory.Create(SOutOfMemory);
  InvalidPointer := EInvalidPointer.Create(SInvalidPointer);}
  ErrorProc := @ErrorHandler;
  ExceptProc := @ExceptHandler;
  ExceptionClass := Exception;

  ExceptClsProc := @GetExceptionClass;

  ExceptObjProc := @GetExceptionObject;

  {AssertErrorProc := @AssertErrorHandler;}
  {+} // Initialize Assert only when "Assertions" option is turned on in Compiler:
  Assert( InitAssertErrorProc, '' );
  {-}

  //AbstractErrorProc := @AbstractErrorHandler;
  // {-} KOL does not use classes, so EAbstractError should never be raised.

end;

procedure DoneExceptions;
begin
  {OutOfMemory.AllowFree := True;
  OutOfMemory.FreeInstance;
  OutOfMemory := nil;
  InvalidPointer.AllowFree := True;
  InvalidPointer.Free;
  InvalidPointer := nil;}
  ErrorProc := nil;
  ExceptProc := nil;
  ExceptionClass := nil;
  //ExceptClsProc := nil; --see InitExceptions
  ExceptObjProc := nil;
  AssertErrorProc := nil;
end;

{ RaiseLastWin32Error }

procedure RaiseLastWin32Error;
var
  LastError: DWORD;
  Error: Exception;
begin
  LastError := GetLastError;
  if LastError <> ERROR_SUCCESS then
    Error := Exception.CreateFmt(e_Win32, SWin32Error, [LastError,
      SysErrorMessage(LastError)])
  else
    Error := Exception.Create(e_Win32, SUnkWin32Error );
  Error.ErrorCode := LastError;
  raise Error;
end;

{ Win32Check }

function Win32Check(RetVal: BOOL): BOOL;
begin
  if not RetVal then RaiseLastWin32Error;
  Result := RetVal;
end;

type
  PTerminateProcInfo = ^TTerminateProcInfo;
  TTerminateProcInfo = record
    Next: PTerminateProcInfo;
    Proc: TTerminateProc;
  end;

var
  TerminateProcList: PTerminateProcInfo = nil;

procedure AddTerminateProc(TermProc: TTerminateProc);
var
  P: PTerminateProcInfo;
begin
  New(P);
  P^.Next := TerminateProcList;
  P^.Proc := TermProc;
  TerminateProcList := P;
end;

function CallTerminateProcs: Boolean;
var
  PI: PTerminateProcInfo;
begin
  Result := True;
  PI := TerminateProcList;
  while Result and (PI <> nil) do
  begin
    Result := PI^.Proc;
    PI := PI^.Next;
  end;
end;

procedure FreeTerminateProcs;
var
  PI: PTerminateProcInfo;
begin
  while TerminateProcList <> nil do
  begin
    PI := TerminateProcList;
    TerminateProcList := PI^.Next;
    Dispose(PI);
  end;
end;

{ --- }

function AL1(const P): LongWord;
asm
        MOV     EDX,DWORD PTR [P]
        XOR     EDX,DWORD PTR [P+4]
        XOR     EDX,DWORD PTR [P+8]
        XOR     EDX,DWORD PTR [P+12]
        MOV     EAX,EDX
end;

function AL2(const P): LongWord;
asm
        MOV     EDX,DWORD PTR [P]
        ROR     EDX,5
        XOR     EDX,DWORD PTR [P+4]
        ROR     EDX,5
        XOR     EDX,DWORD PTR [P+8]
        ROR     EDX,5
        XOR     EDX,DWORD PTR [P+12]
        MOV     EAX,EDX
end;

const
  AL1s: array[0..2] of LongWord = ($FFFFFFF0, $FFFFEBF0, 0);
  AL2s: array[0..2] of LongWord = ($42C3ECEF, $20F7AEB6, $D1C2F74E);

procedure ALV;
begin
  raise Exception.Create(e_License, SNL);
end;

{$IFNDEF _D2}
function ALR: Pointer;
var
  LibModule: PLibModule;
begin
  if MainInstance <> 0 then
    Result := Pointer(LoadResource(MainInstance, FindResource(MainInstance, 'DVCLAL',
      PKOLChar( RT_RCDATA ))))
  else
  begin
    Result := nil;
    LibModule := LibModuleList;
    while LibModule <> nil do
    begin
      with LibModule^ do
      begin
        Result := Pointer(LoadResource(Instance, FindResource(Instance, 'DVCLAL',
          PKOLChar( RT_RCDATA ))));
        if Result <> nil then Break;
      end;
      LibModule := LibModule.Next;
    end;
  end;
  if Result = nil then ALV;
end;

function GDAL: LongWord;
type
  TDVCLAL = array[0..3] of LongWord;
  PDVCLAL = ^TDVCLAL;
var
  P: Pointer;
  A1, A2: LongWord;
  PAL1s, PAL2s: PDVCLAL;
  ALOK: Boolean;
begin
  P := ALR;
  A1 := AL1(P^);
  A2 := AL2(P^);
  Result := A1;
  PAL1s := @AL1s;
  PAL2s := @AL2s;
  ALOK := ((A1 = PAL1s[0]) and (A2 = PAL2s[0])) or
          ((A1 = PAL1s[1]) and (A2 = PAL2s[1])) or
          ((A1 = PAL1s[2]) and (A2 = PAL2s[2]));
  FreeResource(Integer(P));
  if not ALOK then ALV;
end;

procedure RCS;
var
  P: Pointer;
  ALOK: Boolean;
begin
  P := ALR;
  ALOK := (AL1(P^) = AL1s[2]) and (AL2(P^) = AL2s[2]);
  FreeResource(Integer(P));
  if not ALOK then ALV;
end;

procedure RPR;
var
  AL: LongWord;
begin
  AL := GDAL;
  if (AL <> AL1s[1]) and (AL <> AL1s[2]) then ALV;
end;
{$ENDIF}

{$IFNDEF _D2orD3}
function SafeLoadLibrary(const Filename: KOLString; ErrorMode: UINT): HMODULE;
var
  OldMode: UINT;
  FPUControlWord: Word;
begin
  OldMode := SetErrorMode(ErrorMode);
  try
    asm
      FNSTCW  FPUControlWord
    end;
    try
      Result := LoadLibrary(PKOLChar(Filename));
    finally
      asm
        FNCLEX
        FLDCW FPUControlWord
      end;
    end;
  finally
    SetErrorMode(OldMode);
  end;
end;
{$ENDIF}

{procedure Exception.FreeInstance;
begin
  if FAllowFree then
    inherited;
end;}



initialization
  InitExceptions;

finalization
  FreeTerminateProcs;
  DoneExceptions;

end.