{
    Copyright (c) 1998-2002 by Florian Klaempfl

    This unit implements some support functions and global variables

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 ****************************************************************************
}
unit globals;

{$i fpcdefs.inc}

interface

    uses
{$ifdef windows}
      windows,
{$endif}
{$ifdef os2}
      dos,
{$endif os2}
{$ifdef hasunix}
      Baseunix,unix,
{$endif}

{$IFNDEF USE_FAKE_SYSUTILS}
      sysutils,
{$ELSE}
      fksysutl,
{$ENDIF}
      { comphook pulls in sysutils anyways }
      cutils,cclasses,cfileutl,
      cpuinfo,
      globtype,version,systems;

    const
       delphimodeswitches =
         [m_delphi,m_class,m_objpas,m_result,m_string_pchar,
          m_pointer_2_procedure,m_autoderef,m_tp_procvar,m_initfinal,m_default_ansistring,
          m_out,m_default_para,m_duplicate_names,m_hintdirective,
          m_property,m_default_inline,m_except,m_advanced_records,m_type_helpers];
       delphiunicodemodeswitches = delphimodeswitches + [m_systemcodepage,m_default_unicodestring];
       fpcmodeswitches =
         [m_fpc,m_string_pchar,m_nested_comment,m_repeat_forward,
          m_cvar_support,m_initfinal,m_hintdirective,
          m_property,m_default_inline];
       objfpcmodeswitches =
         [m_objfpc,m_fpc,m_class,m_objpas,m_result,m_string_pchar,m_nested_comment,
          m_repeat_forward,m_cvar_support,m_initfinal,m_out,m_default_para,m_hintdirective,
          m_property,m_default_inline,m_except];
       tpmodeswitches =
         [m_tp7,m_tp_procvar,m_duplicate_names];
{$ifdef gpc_mode}
       gpcmodeswitches =
         [m_gpc,m_tp_procvar];
{$endif}
       macmodeswitches =
         [m_mac,m_cvar_support,m_mac_procvar,m_nested_procvars,m_non_local_goto,m_isolike_unary_minus,m_default_inline];
       isomodeswitches =
         [m_iso,m_tp_procvar,m_duplicate_names,m_nested_procvars,m_non_local_goto,m_isolike_unary_minus];

       { maximum nesting of routines }
       maxnesting = 32;

       { Filenames and extensions }
       sourceext  = '.pp';
       pasext     = '.pas';
       pext       = '.p';

       treelogfilename = 'tree.log';

{$if defined(CPUARM) and defined(FPUFPA)}
       MathQNaN : tcompdoublerec = (bytes : (0,0,252,255,0,0,0,0));
       MathInf : tcompdoublerec = (bytes : (0,0,240,127,0,0,0,0));
       MathNegInf : tcompdoublerec = (bytes : (0,0,240,255,0,0,0,0));
       MathPi : tcompdoublerec =  (bytes : (251,33,9,64,24,45,68,84));
{$else}
{$ifdef FPC_LITTLE_ENDIAN}
       MathQNaN : tcompdoublerec = (bytes : (0,0,0,0,0,0,252,255));
       MathInf : tcompdoublerec = (bytes : (0,0,0,0,0,0,240,127));
       MathNegInf : tcompdoublerec = (bytes : (0,0,0,0,0,0,240,255));
       MathPi : tcompdoublerec = (bytes : (24,45,68,84,251,33,9,64));
       MathPiExtended : tcompextendedrec = (bytes : (53,194,104,33,162,218,15,201,0,64));
{$else FPC_LITTLE_ENDIAN}
       MathQNaN : tcompdoublerec = (bytes : (255,252,0,0,0,0,0,0));
       MathInf : tcompdoublerec = (bytes : (127,240,0,0,0,0,0,0));
       MathNegInf : tcompdoublerec = (bytes : (255,240,0,0,0,0,0,0));
       MathPi : tcompdoublerec =  (bytes : (64,9,33,251,84,68,45,24));
       MathPiExtended : tcompextendedrec = (bytes : (64,0,201,15,218,162,33,104,194,53));
{$endif FPC_LITTLE_ENDIAN}
{$endif}

       CP_UTF8 = 65001;
       CP_UTF16LE = 1200;
       CP_UTF16BE = 1201;
       CP_NONE  = 65535;

       { by default no local variable trashing }
       localvartrashing: longint = -1;

       nroftrashvalues = 4;
       trashintvalues: array[0..nroftrashvalues-1] of int64 = ($5555555555555555,$AAAAAAAAAAAAAAAA,$EFEFEFEFEFEFEFEF,0);


    type
       { this is written to ppus during token recording for generics,
         it used to required to be packed,
         but this requirement is now obsolete,
         as the fields are written one by one. PM 2012-06-13 }
       tsettings = record
         alignment       : talignmentinfo;
         globalswitches  : tglobalswitches;
         targetswitches  : ttargetswitches;
         moduleswitches  : tmoduleswitches;
         localswitches   : tlocalswitches;
         modeswitches    : tmodeswitches;
         optimizerswitches : toptimizerswitches;
         { generate information necessary to perform these wpo's during a subsequent compilation }
         genwpoptimizerswitches: twpoptimizerswitches;
         { perform these wpo's using information generated during a previous compilation }
         dowpoptimizerswitches: twpoptimizerswitches;
         debugswitches   : tdebugswitches;
         { 0: old behaviour for sets <=256 elements
           >0: round to this size }
         setalloc,
         packenum        : shortint;

         packrecords     : shortint;
         maxfpuregisters : shortint;

         cputype,
         optimizecputype : tcputype;
         fputype         : tfputype;
         asmmode         : tasmmode;
         interfacetype   : tinterfacetypes;
         defproccall     : tproccalloption;
         sourcecodepage  : tstringencoding;

         minfpconstprec  : tfloattype;

         disabledircache : boolean;

{$if defined(i8086)}
         x86memorymodel  : tx86memorymodel;
{$endif defined(i8086)}

{$if defined(ARM)}
         instructionset : tinstructionset;
{$endif defined(ARM)}

        { CPU targets with microcontroller support can add a controller specific unit }
         controllertype   : tcontrollertype;

         { WARNING: this pointer cannot be written as such in record token }
         pmessage : pmessagestaterecord;
       end;

    const
      LinkMapWeightDefault = 1000;

    type
      TLinkRec = record
        Key   : AnsiString;
        Value : AnsiString; // key expands to valuelist "value"
        Weight: longint;
      end;

      TLinkStrMap  = class
      private
        itemcnt : longint;
        fmap : Array Of TLinkRec;
        function  Lookup(key:Ansistring):longint;
        function getlinkrec(i:longint):TLinkRec;
      public
        procedure Add(key:ansistring;value:AnsiString='';weight:longint=LinkMapWeightDefault);
        procedure addseries(keys:AnsiString;weight:longint=LinkMapWeightDefault);
        function  AddDep(keyvalue:String):boolean;
        function  AddWeight(keyvalue:String):boolean;
        procedure SetValue(key:AnsiString;Weight:Integer);
        procedure SortonWeight;
        function Find(key:AnsiString):AnsiString;
        procedure Expand(src:TCmdStrList;dest: TLinkStrMap);
        procedure UpdateWeights(Weightmap:TLinkStrMap);
        constructor Create;
        property count : longint read itemcnt;
        property items[I:longint]:TLinkRec read getlinkrec; default;
      end;


      tpendingstate = record
        nextverbositystr : shortstring;
        nextlocalswitches : tlocalswitches;
        nextverbosityfullswitch: longint;
        nextcallingstr : shortstring;
        nextmessagerecord : pmessagestaterecord;
        verbosityfullswitched,
        localswitcheschanged : boolean;
      end;


    var
       { specified inputfile }
       inputfilepath     : string;
       inputfilename     : string;
       { specified outputfile with -o parameter }
       outputfilename    : string;
       outputprefix      : pshortstring;
       outputsuffix      : pshortstring;
       { specified with -FE or -FU }
       outputexedir      : TPathStr;
       outputunitdir     : TPathStr;
       { specified with -FW and -Fw }
       wpofeedbackinput,
       wpofeedbackoutput : TPathStr;

       { external assembler extra option }
       asmextraopt       : string;

       { things specified with parameters }
       paratarget        : tsystem;
       paratargetdbg     : tdbg;
       paratargetasm     : tasm;
       paralinkoptions   : TCmdStr;
       paradynamiclinker : string;
       paraprintnodetree : byte;
{$ifdef PREPROCWRITE}
       parapreprocess    : boolean;
{$endif PREPROCWRITE}
       printnodefile     : text;

       {  typical cross compiling params}

       { directory where the utils can be found (options -FD) }
       utilsdirectory : TPathStr;
       { targetname specific prefix used by these utils (options -XP<path>) }
       utilsprefix    : TCmdStr;
       cshared        : boolean;        { pass --shared to ld to link C libs shared}
       Dontlinkstdlibpath: Boolean;     { Don't add std paths to linkpath}
       rlinkpath      : TCmdStr;        { rpath-link linkdir override}
       sysrootpath    : TCmdStr;        { target system root to search dyn linker }

       { some flags for global compiler switches }
       do_build,
       do_release,
       do_make       : boolean;
       { Path to ppc }
       exepath       : TPathStr;
       { Path to unicode charmap/collation binaries }
       unicodepath   : TPathStr;
       { path for searching units, different paths can be seperated by ; }
       librarysearchpath,
       unitsearchpath,
       objectsearchpath,
       includesearchpath,
       frameworksearchpath  : TSearchPathList;
       autoloadunits      : string;

       { linking }
       usegnubinutils : boolean;
       forceforwardslash : boolean;
       usewindowapi  : boolean;
       description   : string;
       SetPEFlagsSetExplicity,
       SetPEOptFlagsSetExplicity,
       ImageBaseSetExplicity,
       MinStackSizeSetExplicity,
       MaxStackSizeSetExplicity,
       DescriptionSetExplicity : boolean;
       dllversion    : string;
       dllmajor,
       dllminor,
       dllrevision   : word;  { revision only for netware }
       { win pe  }
       peoptflags,
       peflags : longint;
       minstacksize,
       maxstacksize,
       imagebase     : puint;
       UseDeffileForExports    : boolean;
       UseDeffileForExportsSetExplicitly : boolean;
       GenerateImportSection,
       GenerateImportSectionSetExplicitly,
       RelocSection : boolean;
       MacOSXVersionMin,
       iPhoneOSVersionMin: string[15];
       RelocSectionSetExplicitly : boolean;
       LinkTypeSetExplicitly : boolean;

       current_tokenpos,                  { position of the last token }
       current_filepos : tfileposinfo;    { current position }

       nwscreenname : string;
       nwthreadname : string;
       nwcopyright  : string;

       codegenerror : boolean;           { true if there is an error reported }

       block_type : tblock_type;         { type of currently parsed block }

       compile_level : word;
       exceptblockcounter    : integer;  { each except block gets a unique number check gotos      }
       current_exceptblock        : integer;  { the exceptblock number of the current block (0 if none) }
       LinkLibraryAliases : TLinkStrMap;
       LinkLibraryOrder   : TLinkStrMap;

       init_settings,
       current_settings   : tsettings;

       pendingstate       : tpendingstate;
     { Memory sizes }
       heapsize,
       maxheapsize,
       stacksize,
       jmp_buf_size,
       jmp_buf_align : longint;

{$Ifdef EXTDEBUG}
     { parameter switches }
       debugstop : boolean;
{$EndIf EXTDEBUG}
       { Application type (platform specific)
         see globtype.pas for description }
       apptype : tapptype;

       features : tfeatures;

       { prefix added to automatically generated setters/getters. If empty,
         no getters/setters will be automatically generated except if required
         for visibility reasons (but in that case the names will be mangled so
         they are unique) }
       prop_auto_getter_prefix,
       prop_auto_setter_prefix : string;

    const
       DLLsource : boolean = false;

       { used to set all registers used for each global function
         this should dramatically decrease the number of
         recompilations needed PM }
       simplify_ppu : boolean = true;

       Inside_asm_statement : boolean = false;

       global_unit_count : word = 0;

       { for error info in pp.pas }
       parser_current_file : string = '';

{$if defined(m68k) or defined(arm)}
       { PalmOS resources }
       palmos_applicationname : string = 'FPC Application';
       palmos_applicationid : string[4] = 'FPCA';
{$endif defined(m68k) or defined(arm)}

{$ifdef powerpc}
       { default calling convention used on MorphOS }
       syscall_convention : string = 'LEGACY';
{$endif powerpc}

       { default name of the C-style "main" procedure of the library/program }
       { (this will be prefixed with the target_info.cprefix)                }
       defaultmainaliasname = 'main';
       mainaliasname : string = defaultmainaliasname;

    const
      default_settings : TSettings = (
        alignment : (
          procalign : 0;
          loopalign : 0;
          jumpalign : 0;
          constalignmin : 0;
          constalignmax : 0;
          varalignmin : 0;
          varalignmax : 0;
          localalignmin : 0;
          localalignmax : 0;
          recordalignmin : 0;
          recordalignmax : 0;
          maxCrecordalign : 0;
        );
        globalswitches : [cs_check_unit_name,cs_link_static];
        targetswitches : [];
        moduleswitches : [cs_extsyntax,cs_implicit_exceptions];
        localswitches : [cs_check_io,cs_typed_const_writable,cs_pointermath{$ifdef i8086},cs_force_far_calls{$endif}];
        modeswitches : fpcmodeswitches;
        optimizerswitches : [];
        genwpoptimizerswitches : [];
        dowpoptimizerswitches : [];
        debugswitches : [];

        setalloc : 0;
        packenum : 4;

{$ifdef i8086}
        packrecords     : 1;
{$else i8086}
        packrecords     : 0;
{$endif i8086}
        maxfpuregisters : 0;

{ Note: GENERIC_CPU is used together with generic subdirectory to
  be able to compile some of the units without any real CPU.
  This is used to generate a CPU independant PPUDUMP utility. PM }
{$ifdef GENERIC_CPU}
        cputype : cpu_none;
        optimizecputype : cpu_none;
        fputype : fpu_none;
{$else not GENERIC_CPU}
  {$ifdef i386}
        cputype : cpu_Pentium;
        optimizecputype : cpu_Pentium3;
        fputype : fpu_x87;
  {$endif i386}
  {$ifdef m68k}
        cputype : cpu_MC68020;
        optimizecputype : cpu_MC68020;
        fputype : fpu_soft;
  {$endif m68k}
  {$ifdef powerpc}
        cputype : cpu_PPC604;
        optimizecputype : cpu_ppc7400;
        fputype : fpu_standard;
  {$endif powerpc}
  {$ifdef POWERPC64}
        cputype : cpu_PPC970;
        optimizecputype : cpu_ppc970;
        fputype : fpu_standard;
  {$endif POWERPC64}
  {$ifdef sparc}
        cputype : cpu_SPARC_V9;
        optimizecputype : cpu_SPARC_V9;
        fputype : fpu_hard;
  {$endif sparc}
  {$ifdef arm}
        cputype : cpu_armv3;
        optimizecputype : cpu_armv3;
        fputype : fpu_fpa;
  {$endif arm}
  {$ifdef x86_64}
        cputype : cpu_athlon64;
        optimizecputype : cpu_athlon64;
        fputype : fpu_sse64;
  {$endif x86_64}
  {$ifdef ia64}
        cputype : cpu_itanium;
        optimizecputype : cpu_itanium;
        fputype : fpu_itanium;
  {$endif ia64}
  {$ifdef avr}
        cputype : cpuinfo.cpu_avr5;
        optimizecputype : cpuinfo.cpu_avr5;
        fputype : fpu_none;
  {$endif avr}
  {$ifdef mips}
        cputype : cpu_mips2;
        optimizecputype : cpu_mips2;
        fputype : fpu_mips2;
  {$endif mips}
  {$ifdef jvm}
        cputype : cpu_none;
        optimizecputype : cpu_none;
        fputype : fpu_standard;
  {$endif jvm}
  {$ifdef aarch64}
        cputype : cpu_armv8;
        optimizecputype : cpu_armv8;
        fputype : fpu_vfp;
  {$endif aarch64}
  {$ifdef i8086}
        cputype : cpu_8086;
        optimizecputype : cpu_8086;
        fputype : fpu_x87;
  {$endif i8086}
{$endif not GENERIC_CPU}
        asmmode : asmmode_standard;
{$ifndef jvm}
        interfacetype : it_interfacecom;
{$else jvm}
        interfacetype : it_interfacejava;
{$endif jvm}
        defproccall : pocall_default;
        sourcecodepage : 28591;
        minfpconstprec : s32real;

        disabledircache : false;
{$if defined(i8086)}
        x86memorymodel : mm_small;
{$endif defined(i8086)}
{$if defined(ARM)}
        instructionset : is_arm;
{$endif defined(ARM)}
        controllertype : ct_none;
        pmessage : nil;
      );

    var
      starttime  : real;

    function getdatestr:string;
    Function UnixToDateTime(const AValue: Int64): TDateTime;
    function gettimestr:string;
    function filetimestring( t : longint) : string;
    function getrealtime : real;

    procedure DefaultReplacements(var s:ansistring);

    function  GetEnvPChar(const envname:ansistring):pchar;
    procedure FreeEnvPChar(p:pchar);

    function is_number_float(d : double) : boolean;
    { discern +0.0 and -0.0 }
    function get_real_sign(r: bestreal): longint;

    procedure InitGlobals;
    procedure DoneGlobals;

    function  string2guid(const s: string; var GUID: TGUID): boolean;
    function  guid2string(const GUID: TGUID): string;

    function SetAktProcCall(const s:string; var a:tproccalloption):boolean;
    function Setabitype(const s:string;var a:tabi):boolean;
    function Setoptimizecputype(const s:string;var a:tcputype):boolean;
    function Setcputype(const s:string;var a:tsettings):boolean;
    function SetFpuType(const s:string;var a:tfputype):boolean;
    function SetControllerType(const s:string;var a:tcontrollertype):boolean;
    function IncludeFeature(const s : string) : boolean;
    function SetMinFPConstPrec(const s: string; var a: tfloattype) : boolean;

    {# Routine to get the required alignment for size of data, which will
       be placed in bss segment, according to the current alignment requirements }
    function var_align(want_align: longint): shortint;
    function var_align_size(siz: longint): shortint;
    {# Routine to get the required alignment for size of data, which will
       be placed in data/const segment, according to the current alignment requirements }
    function const_align(want_align: longint): shortint;
    function const_align_size(siz: longint): shortint;
{$ifdef ARM}
    function is_double_hilo_swapped: boolean;{$ifdef USEINLINE}inline;{$endif}
{$endif ARM}
    function floating_point_range_check_error : boolean;

  { hide Sysutils.ExecuteProcess in units using this one after SysUtils}
  const
    ExecuteProcess = 'Do not use' deprecated 'Use cfileutil.RequotedExecuteProcess instead, ExecuteProcess cannot deal with single quotes as used by Unix command lines';


implementation

    uses
{$ifdef macos}
      macutils,
{$endif}
{$ifdef mswindows}
      windirs,
{$endif}
      comphook;

{****************************************************************************
                                 TLinkStrMap
****************************************************************************}

    Constructor TLinkStrMap.create;
      begin
        inherited;
        itemcnt:=0;
      end;


    procedure TLinkStrMap.Add(key:ansistring;value:AnsiString='';weight:longint=LinkMapWeightDefault);
      begin
        if lookup(key)<>-1 Then
          exit;
        if itemcnt<=length(fmap) Then
          setlength(fmap,itemcnt+10);
        fmap[itemcnt].key:=key;
        fmap[itemcnt].value:=value;
        fmap[itemcnt].weight:=weight;
        inc(itemcnt);
      end;


    function  TLinkStrMap.AddDep(keyvalue:String):boolean;
      var
        i : Longint;
      begin
        AddDep:=false;
        i:=pos('=',keyvalue);
        if i=0 then
          exit;
        Add(Copy(KeyValue,1,i-1),Copy(KeyValue,i+1,length(KeyValue)-i));
        AddDep:=True;
      end;


    function  TLinkStrMap.AddWeight(keyvalue:String):boolean;
      var
        i,j    : Longint;
        Code : Word;
        s    : AnsiString;
      begin
        AddWeight:=false;
        i:=pos('=',keyvalue);
        if i=0 then
          exit;
        s:=Copy(KeyValue,i+1,length(KeyValue)-i);
        val(s,j,code);
        if code=0 Then
          begin
            Add(Copy(KeyValue,1,i-1),'',j);
            AddWeight:=True;
          end;
      end;


    procedure TLinkStrMap.addseries(keys:AnsiString;weight:longint);
      var
        i,j,k : longint;
      begin
       k:=length(keys);
       i:=1;
       while i<=k do
         begin
           j:=i;
           while (i<=k) and (keys[i]<>',') do
             inc(i);
           add(copy(keys,j,i-j),'',weight);
           inc(i);
         end;
      end;

    procedure TLinkStrMap.SetValue(Key:Ansistring;weight:Integer);
      var
        j : longint;
      begin
         j:=lookup(key);
         if j<>-1 then
          fmap[j].weight:=weight;
      end;


    function TLinkStrMap.find(key:Ansistring):Ansistring;
      var
        j : longint;
      begin
         find:='';
         j:=lookup(key);
         if j<>-1 then
          find:=fmap[j].value;
      end;


    function TLinkStrMap.lookup(key:Ansistring):longint;
      var
        i : longint;
      begin
         lookup:=-1;
         i:=0;
         while (i<itemcnt) and (fmap[i].key<>key) do
           inc(i);
         if i<>itemcnt then
            lookup:=i;
      end;


    procedure TLinkStrMap.SortOnWeight;
      var
        i, j : longint;
        m    : TLinkRec;
      begin
        if itemcnt <2 then exit;
        for i:=0 to itemcnt-1 do
          for j:=i+1 to itemcnt-1 do
            begin
            if fmap[i].weight>fmap[j].weight Then
              begin
                m:=fmap[i];
                fmap[i]:=fmap[j];
                fmap[j]:=m;
              end;
           end;
      end;


    function TLinkStrMap.getlinkrec(i:longint):TLinkRec;
      begin
        result:=fmap[i];
      end;


    procedure TLinkStrMap.Expand(Src:TCmdStrList;Dest:TLinkStrMap);
      // expands every thing in Src to Dest for linkorder purposes.
      var
        r  : longint;
        LibN    : TCmdStr;
      begin
        while not src.empty do
          begin
            LibN:=src.getfirst;
            r:=lookup (LibN);
            if r=-1 then
              dest.add(LibN)
            else
              dest.addseries(fmap[r].value);
          end;
      end;

    procedure TLinkStrMap.UpdateWeights(Weightmap:TLinkStrMap);
      var
        l,r : longint;
      begin
        for l := 0 to itemcnt-1 do
          begin
            r:=weightmap.lookup (fmap[l].key);
            if r<>-1 then
              fmap[l].weight:=weightmap[r].weight;
          end;
      end;


{****************************************************************************
                               Time Handling
****************************************************************************}

    Function L0(l:longint):string;
    {
      return the string of value l, if l<10 then insert a zero, so
      the string is always at least 2 chars '01','02',etc
    }
      var
        s : string;
      begin
        Str(l,s);
        if l<10 then
         s:='0'+s;
        L0:=s;
      end;


   function gettimestr:string;
   {
     get the current time in a string HH:MM:SS
   }
      var
        hour,min,sec,hsec : word;
      begin
        DecodeTime(Time,hour,min,sec,hsec);
        gettimestr:=L0(Hour)+':'+L0(min)+':'+L0(sec);
      end;


   function getdatestr:string;
   {
     get the current date in a string YY/MM/DD
   }
      var
        Year,Month,Day: Word;
        SourceDateEpoch: string;
      begin
        SourceDateEpoch := GetEnvironmentVariable('SOURCE_DATE_EPOCH');
        if Length(SourceDateEpoch)>0 then
           DecodeDate(UnixToDateTime(StrToInt64(SourceDateEpoch)),year,month,day)
        else
          DecodeDate(Date,year,month,day);
        getdatestr:=L0(Year)+'/'+L0(Month)+'/'+L0(Day);
      end;

   Function UnixToDateTime(const AValue: Int64): TDateTime;
   { Code copied from fpcsrc/packages/rtl-objpas/src/inc/dateutil.inc and
   fpcsrc/rtl/objpas/sysutils/datih.inc }
   const
      TDateTimeEpsilon = 2.2204460493e-16 ;
      UnixEpoch = TDateTime(-2415018.5) + TDateTime(2440587.5) ;
   begin
      Result:=UnixEpoch + AValue/SecsPerDay;
      if (UnixEpoch>=0) and (Result<-TDateTimeEpsilon) then
         Result:=int(Result-1.0+TDateTimeEpsilon)-frac(1.0+frac(Result))
      else if (UnixEpoch<=-1.0) and (Result>-1.0+TDateTimeEpsilon) then
         Result:=int(Result+1.0-TDateTimeEpsilon)+frac(1.0-abs(frac(1.0+Result)));
   end;

   function  filetimestring( t : longint) : string;
   {
     convert dos datetime t to a string YY/MM/DD HH:MM:SS
   }
     var
       DT : TDateTime;
       hsec : word;
       Year,Month,Day: Word;
       hour,min,sec : word;
     begin
       if t=-1 then
        begin
          Result := 'Not Found';
          exit;
        end;
       DT := FileDateToDateTime(t);
       DecodeTime(DT,hour,min,sec,hsec);
       DecodeDate(DT,year,month,day);
       Result := L0(Year)+'/'+L0(Month)+'/'+L0(Day)+' '+L0(Hour)+':'+L0(min)+':'+L0(sec);
     end;


   function getrealtime : real;
     var
       h,m,s,s1000 : word;
     begin
       DecodeTime(Time,h,m,s,s1000);
       result:=h*3600.0+m*60.0+s+s1000/1000.0;
     end;

{****************************************************************************
                          Default Macro Handling
****************************************************************************}


     procedure DefaultReplacements(var s:ansistring);
{$ifdef mswindows}
       procedure ReplaceSpecialFolder(const MacroName: string; const ID: integer);
         begin
           // Only try to receive the special folders (and thus dynamically
           // load shfolder.dll) when that's needed.
           if pos(MacroName,s)>0 then
             Replace(s,MacroName,GetWindowsSpecialDir(ID));
         end;

{$endif mswindows}
       var
         envstr: string;
         envvalue: pchar;
         i: integer;
       begin
         { Replace some macros }
         Replace(s,'$FPCVERSION',version_string);
         Replace(s,'$FPCFULLVERSION',full_version_string);
         Replace(s,'$FPCDATE',date_string);
         Replace(s,'$FPCCPU',target_cpu_string);
         Replace(s,'$FPCOS',target_os_string);
         if (tf_use_8_3 in Source_Info.Flags) or
            (tf_use_8_3 in Target_Info.Flags) then
           Replace(s,'$FPCTARGET',target_os_string)
         else
           Replace(s,'$FPCTARGET',target_full_string);
         Replace(s,'$FPCSUBARCH',lower(cputypestr[init_settings.cputype]));
         Replace(s,'$FPCABI',lower(abiinfo[target_info.abi].name));
{$ifdef i8086}
         Replace(s,'$FPCMEMORYMODEL',lower(x86memorymodelstr[init_settings.x86memorymodel]));
{$else i8086}
         Replace(s,'$FPCMEMORYMODEL','flat');
{$endif i8086}
{$ifdef mswindows}
         ReplaceSpecialFolder('$LOCAL_APPDATA',CSIDL_LOCAL_APPDATA);
         ReplaceSpecialFolder('$APPDATA',CSIDL_APPDATA);
         ReplaceSpecialFolder('$COMMON_APPDATA',CSIDL_COMMON_APPDATA);
         ReplaceSpecialFolder('$PERSONAL',CSIDL_PERSONAL);
         ReplaceSpecialFolder('$PROGRAM_FILES',CSIDL_PROGRAM_FILES);
         ReplaceSpecialFolder('$PROGRAM_FILES_COMMON',CSIDL_PROGRAM_FILES_COMMON);
         ReplaceSpecialFolder('$PROFILE',CSIDL_PROFILE);
{$endif mswindows}
         { Replace environment variables between dollar signs }
         i := pos('$',s);
         while i>0 do
          begin
            envstr:=copy(s,i+1,length(s)-i);
            i:=pos('$',envstr);
            if i>0 then
             begin
               envstr := copy(envstr,1,i-1);
               envvalue := GetEnvPChar(envstr);
               if assigned(envvalue) then
                 begin
                 Replace(s,'$'+envstr+'$',envvalue);
                 // Look if there is another env.var in the string
                 i:=pos('$',s);
                 end
               else
                 // if the env.var is not set, do not replace the env.variable
                 // and stop looking for more env.var within the string
                 i := 0;
              FreeEnvPChar(envvalue);
             end;
          end;
       end;


 {****************************************************************************
                               OS Dependent things
 ****************************************************************************}

    function GetEnvPChar(const envname:ansistring):pchar;
      {$ifdef mswindows}
      var
        s     : string;
        i,len : longint;
        hp,p,p2 : pchar;
      {$endif}
      begin
      {$ifdef hasunix}
        GetEnvPchar:=BaseUnix.fpGetEnv(pansichar(envname));
        {$define GETENVOK}
      {$endif}
      {$ifdef mswindows}
        GetEnvPchar:=nil;
        p:=GetEnvironmentStringsA;
        hp:=p;
        while hp^<>#0 do
         begin
           s:=strpas(hp);
           i:=pos('=',s);
           len:=strlen(hp);
           if upper(copy(s,1,i-1))=upper(envname) then
            begin
              GetMem(p2,len-length(envname));
              Move(hp[i],p2^,len-length(envname));
              GetEnvPchar:=p2;
              break;
            end;
           { next string entry}
           hp:=hp+len+1;
         end;
        FreeEnvironmentStrings(p);
        {$define GETENVOK}
      {$endif}
      {$ifdef os2}
        GetEnvPChar := Dos.GetEnvPChar (EnvName);
        {$define GETENVOK}
      {$endif}
      {$ifdef GETENVOK}
        {$undef GETENVOK}
      {$else}
        GetEnvPchar:=StrPNew(GetEnvironmentVariable(envname));
        if (length(GetEnvPChar)=0) then
          begin
            FreeEnvPChar(GetEnvPChar);
            GetEnvPChar:=nil;
          end;
      {$endif}
      end;


    procedure FreeEnvPChar(p:pchar);
      begin
      {$ifndef hasunix}
       {$ifndef os2}
        freemem(p);
       {$endif}
      {$endif}
      end;

      function is_number_float(d : double) : boolean;
        var
           bytearray : array[0..7] of byte;
        begin
          move(d,bytearray,8);
          { only 1.1 save, 1.0.x will use always little endian }
{$ifdef FPC_BIG_ENDIAN}
          result:=((bytearray[0] and $7f)<>$7f) or ((bytearray[1] and $f0)<>$f0);
{$else FPC_BIG_ENDIAN}
          result:=((bytearray[7] and $7f)<>$7f) or ((bytearray[6] and $f0)<>$f0);
{$endif FPC_BIG_ENDIAN}
        end;

    function get_real_sign(r: bestreal): longint;
      var
        p: pbyte;
      begin
        p := pbyte(@r);
{$ifdef CPU_ARM}
        inc(p,4);
{$else}
{$ifdef FPC_LITTLE_ENDIAN}
        inc(p,sizeof(r)-1);
{$endif}
{$endif}
        if (p^ and $80) = 0 then
          result := 1
        else
          result := -1;
      end;

    function convertdoublerec(d : tcompdoublerec) : tcompdoublerec;{$ifdef USEINLINE}inline;{$endif}
{$ifdef CPUARM}
      var
        i : longint;
      begin
        for i:=0 to 3 do
          begin
            result.bytes[i+4]:=d.bytes[i];
            result.bytes[i]:=d.bytes[i+4];
          end;
{$else CPUARM}
      begin
        result:=d;
{$endif CPUARM}
      end;


    { '('D1:'00000000-'D2:'0000-'D3:'0000-'D4:'0000-000000000000)' }
    function string2guid(const s: string; var GUID: TGUID): boolean;
        function ishexstr(const hs: string): boolean;
          var
            i: integer;
          begin
            ishexstr:=false;
            for i:=1 to Length(hs) do begin
              if not (hs[i] in ['0'..'9','A'..'F','a'..'f']) then
                exit;
            end;
            ishexstr:=true;
          end;
        function hexstr2longint(const hexs: string): longint;
          var
            i: integer;
            rl: longint;
          begin
            rl:=0;
            for i:=1 to length(hexs) do begin
              rl:=rl shl 4;
              case hexs[i] of
                '0'..'9' : inc(rl,ord(hexs[i])-ord('0'));
                'A'..'F' : inc(rl,ord(hexs[i])-ord('A')+10);
                'a'..'f' : inc(rl,ord(hexs[i])-ord('a')+10);
              end
            end;
            hexstr2longint:=rl;
          end;
      var
        i: integer;
      begin
        if (Length(s)=38) and (s[1]='{') and (s[38]='}') and
           (s[10]='-') and (s[15]='-') and (s[20]='-') and (s[25]='-') and
           ishexstr(copy(s,2,8)) and ishexstr(copy(s,11,4)) and
           ishexstr(copy(s,16,4)) and ishexstr(copy(s,21,4)) and
           ishexstr(copy(s,26,12)) then begin
          GUID.D1:=dword(hexstr2longint(copy(s,2,8)));
          { these values are arealdy in the correct range (4 chars = word) }
          GUID.D2:=word(hexstr2longint(copy(s,11,4)));
          GUID.D3:=word(hexstr2longint(copy(s,16,4)));
          for i:=0 to 1 do
            GUID.D4[i]:=byte(hexstr2longint(copy(s,21+i*2,2)));
          for i:=2 to 7 do
            GUID.D4[i]:=byte(hexstr2longint(copy(s,22+i*2,2)));
          string2guid:=true;
        end
        else if (length(s)=0) then
          begin
          FillChar(GUID,SizeOf(GUID),0);
          string2guid:=true;
          end
        else
          string2guid:=false;
      end;


    function guid2string(const GUID: TGUID): string;

      begin
        guid2string:=
          '{'+hexstr(GUID.D1,8)+
          '-'+hexstr(GUID.D2,4)+
          '-'+hexstr(GUID.D3,4)+
          '-'+hexstr(GUID.D4[0],2)+hexstr(GUID.D4[1],2)+
          '-'+hexstr(GUID.D4[2],2)+hexstr(GUID.D4[3],2)+
              hexstr(GUID.D4[4],2)+hexstr(GUID.D4[5],2)+
              hexstr(GUID.D4[6],2)+hexstr(GUID.D4[7],2)+
          '}';
      end;


    function SetAktProcCall(const s:string; var a:tproccalloption):boolean;
      const
        DefProcCallName : array[tproccalloption] of string[12] = ('',
         'CDECL',
         'CPPDECL',
         'FAR16',
         'OLDFPCCALL',
         '', { internproc }
         '', { syscall }
         'PASCAL',
         'REGISTER',
         'SAFECALL',
         'STDCALL',
         'SOFTFLOAT',
         'MWPASCAL',
         'INTERRUPT'
        );
      var
        t  : tproccalloption;
        hs : string;
      begin
        result:=false;
        if (s = '') then
          exit;
        hs:=upper(s);
        if (hs = 'DEFAULT') then
          begin
            a := pocall_default;
            result := true;
            exit;
          end;
        for t:=low(tproccalloption) to high(tproccalloption) do
         if DefProcCallName[t]=hs then
          begin
            a:=t;
            result:=true;
            break;
          end;
      end;


    function Setabitype(const s:string;var a:tabi):boolean;
      var
        t  : tabi;
        hs : string;
      begin
        result:=false;
        hs:=Upper(s);
        for t:=low(t) to high(t) do
          if abiinfo[t].supported and
             (abiinfo[t].name=hs) then
            begin
              a:=t;
              { abi_old_win32_gnu is a win32 i386 specific "feature" }
              if (t<>abi_old_win32_gnu) or (target_info.system=system_i386_win32) then
                result:=true;
              break;
            end;
      end;


    function Setoptimizecputype(const s:string;var a:tcputype):boolean;
      var
        t  : tcputype;
        hs : string;
      begin
        result:=false;
        hs:=Upper(s);
        for t:=low(tcputype) to high(tcputype) do
          if cputypestr[t]=hs then
            begin
              a:=t;
              result:=true;
              break;
            end;
      end;


    function Setcputype(const s:string;var a:tsettings):boolean;
      var
        t  : tcputype;
        hs : string;
      begin
        result:=false;
        hs:=Upper(s);
        for t:=low(tcputype) to high(tcputype) do
          if cputypestr[t]=hs then
            begin
              a.cputype:=t;
              result:=true;
              break;
            end;
{$ifdef arm}
        { set default instruction set for arm }
        if result then
          begin
            if a.cputype in [cpu_armv6m,cpu_armv6t2,cpu_armv7m,cpu_armv7em] then
              a.instructionset:=is_thumb
            else
              a.instructionset:=is_arm;
          end;
{$endif arm}
      end;


    function SetFpuType(const s:string;var a:tfputype):boolean;
      var
        t : tfputype;
      begin
        result:=false;
        for t:=low(tfputype) to high(tfputype) do
          if fputypestr[t]=s then
            begin
              a:=t;
              result:=true;
              break;
            end;
      end;


    function SetControllerType(const s:string;var a:tcontrollertype):boolean;
      var
        t  : tcontrollertype;
        hs : string;
      begin
{ The following check allows to reduce amount of code for platforms  }
{ not supporting microcontrollers due to evaluation at compile time. }
{$PUSH}
 {$WARN 6018 OFF} (* Unreachable code due to compile time evaluation *)
        if ControllerSupport then
         begin
          result:=false;
          hs:=Upper(s);
          for t:=low(tcontrollertype) to high(tcontrollertype) do
            if embedded_controllers[t].controllertypestr=hs then
              begin
                a:=t;
                result:=true;
                break;
              end;
         end
        else
         begin
          a := ct_none;
          Result := true;
         end;
{$POP}
      end;


    function IncludeFeature(const s : string) : boolean;
      var
        i : tfeature;
      begin
        result:=true;
        for i:=low(tfeature) to high(tfeature) do
          if s=featurestr[i] then
            begin
              include(features,i);
              exit;
            end;
        result:=false;
      end;


    function SetMinFPConstPrec(const s: string; var a: tfloattype) : boolean;
      var
        value, error: longint;
      begin
        if (upper(s)='DEFAULT') then
          begin
            a:=s32real;
            result:=true;
            exit;
          end;
        result:=false;
        val(s,value,error);
        if (error<>0) then
          exit;
        case value of
          32: a:=s32real;
          64: a:=s64real;
          { adding support for 80 bit here is tricky, since we can't really }
          { check whether the target cpu+OS actually supports it            }
          else
            exit;
        end;
        result:=true;
      end;


    function var_align(want_align: longint): shortint;
      begin
        var_align := used_align(want_align,current_settings.alignment.varalignmin,current_settings.alignment.varalignmax);
      end;


    function var_align_size(siz: longint): shortint;
      begin
        siz := size_2_align(siz);
        var_align_size := var_align(siz);
      end;


    function const_align(want_align: longint): shortint;
      begin
        const_align := used_align(want_align,current_settings.alignment.constalignmin,current_settings.alignment.constalignmax);
      end;


    function const_align_size(siz: longint): shortint;
      begin
        siz := size_2_align(siz);
        const_align_size := const_align(siz);
      end;


{$ifdef ARM}
    function is_double_hilo_swapped: boolean;{$ifdef USEINLINE}inline;{$endif}
      begin
        result := (current_settings.fputype in [fpu_fpa,fpu_fpa10,fpu_fpa11]) and
          not(cs_fp_emulation in current_settings.moduleswitches);
{$ifdef FPC_DOUBLE_HILO_SWAPPED}
        { inverse result if compiler was compiled with swapped hilo already }
        result := not result;
{$endif FPC_DOUBLE_HILO_SWAPPED}
      end;
{$endif ARM}


    function floating_point_range_check_error : boolean;
      begin
        result:=cs_ieee_errors in current_settings.localswitches;
      end;

{****************************************************************************
                                    Init
****************************************************************************}

{$ifdef unix}
  {$define need_path_search}
{$endif unix}
{$ifdef os2}
  {$define need_path_search}
{$endif os2}
{$ifdef macos}
  {$define need_path_search}
{$endif macos}

   procedure get_exepath;
     var
       localExepath : TCmdStr;
       exeName:TCmdStr;
{$ifdef need_path_search}
       hs1 : TPathStr;
{$endif need_path_search}
     begin
       localexepath:=GetEnvironmentVariable('PPC_EXEC_PATH');
       exeName := '';
       if localexepath='' then
         begin
           exeName := FixFileName(system.paramstr(0));
           localexepath := ExtractFilePath(exeName);
         end;
{$ifdef need_path_search}
       if localexepath='' then
        begin
          hs1 := ExtractFileName(exeName);
          ChangeFileExt(hs1,source_info.exeext);
{$ifdef macos}
          FindFile(hs1,GetEnvironmentVariable('Commands'),false,localExepath);
{$else macos}
          FindFile(hs1,GetEnvironmentVariable('PATH'),false,localExepath);
{$endif macos}
          localExepath:=ExtractFilePath(localExepath);
        end;
{$endif need_path_search}
       exepath:=FixPath(localExepath,false);
     end;



   procedure DoneGlobals;
     begin
       librarysearchpath.Free;
       unitsearchpath.Free;
       objectsearchpath.Free;
       includesearchpath.Free;
       frameworksearchpath.Free;
       LinkLibraryAliases.Free;
       LinkLibraryOrder.Free;
     end;

   procedure InitGlobals;
     begin
        get_exepath;

        { reset globals }
        do_build:=false;
        do_release:=false;
        do_make:=true;
        compile_level:=0;
        codegenerror:=false;
        DLLsource:=false;
        paratarget:=system_none;
        paratargetasm:=as_none;
        paratargetdbg:=dbg_none;

        { Output }
        OutputFileName:='';
        OutputPrefix:=Nil;
        OutputSuffix:=Nil;

        OutputExeDir:='';
        OutputUnitDir:='';

        { Utils directory }
        utilsdirectory:='';
        utilsprefix:='';
        cshared:=false;
        rlinkpath:='';
        sysrootpath:='';

        { Search Paths }
        unicodepath:='';
        librarysearchpath:=TSearchPathList.Create;
        unitsearchpath:=TSearchPathList.Create;
        includesearchpath:=TSearchPathList.Create;
        objectsearchpath:=TSearchPathList.Create;
        frameworksearchpath:=TSearchPathList.Create;

        { Def file }
        usewindowapi:=false;
        description:='Compiled by FPC '+version_string+' - '+target_cpu_string;
        DescriptionSetExplicity:=false;
        SetPEFlagsSetExplicity:=false;
        SetPEOptFlagsSetExplicity:=false;
        ImageBaseSetExplicity:=false;
        MinStackSizeSetExplicity:=false;
        MaxStackSizeSetExplicity:=false;

        dllversion:='';
        dllmajor:=1;
        dllminor:=0;
        dllrevision:=0;
        nwscreenname := '';
        nwthreadname := '';
        nwcopyright  := '';
        UseDeffileForExports:=false;
        UseDeffileForExportsSetExplicitly:=false;
        GenerateImportSection:=false;
        RelocSection:=false;
        RelocSectionSetExplicitly:=false;
        LinkTypeSetExplicitly:=false;
        MacOSXVersionMin:='';
        iPhoneOSVersionMin:='';
        { memory sizes, will be overridden by parameter or default for target
          in options or init_parser }
        stacksize:=0;
        { not initialized yet }
{$ifndef jvm}
        jmp_buf_size:=-1;
{$else}
        jmp_buf_size:=0;
{$endif}
        apptype:=app_cui;

        { Init values }
        init_settings:=default_settings;
        if init_settings.optimizecputype=cpu_none then
          init_settings.optimizecputype:=init_settings.cputype;

        LinkLibraryAliases :=TLinkStrMap.Create;
        LinkLibraryOrder   :=TLinkStrMap.Create;

        { enable all features by default }
        features:=[low(Tfeature)..high(Tfeature)];
     end;

end.