fpc/compiler/psystem.pas

{
    Copyright (c) 1998-2002 by Florian Klaempfl

    Load the system unit, create required defs for systemunit

    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 psystem;

{$i fpcdefs.inc}

interface

    uses
      symbase;

    procedure create_intern_symbols;
    procedure create_intern_types;

    procedure load_intern_types;

    procedure registernodes;
    procedure registertais;


implementation

    uses
      globals,globtype,verbose,constexp,cpuinfo,
      systems,
      symconst,symtype,symsym,symdef,symtable,
      aasmtai,aasmdata,aasmcpu,
      ncgutil,ncgrtti,fmodule,
      node,nbas,nflw,nset,ncon,ncnv,nld,nmem,ncal,nmat,nadd,ninl,nopt
      ;


    procedure create_intern_symbols;
      {
        all intern procedures for the system unit
      }
      begin
        systemunit.insert(tsyssym.create('Concat',in_concat_x));
        systemunit.insert(tsyssym.create('Write',in_write_x));
        systemunit.insert(tsyssym.create('WriteLn',in_writeln_x));
        systemunit.insert(tsyssym.create('WriteStr',in_writestr_x));
        systemunit.insert(tsyssym.create('Assigned',in_assigned_x));
        systemunit.insert(tsyssym.create('Read',in_read_x));
        systemunit.insert(tsyssym.create('ReadLn',in_readln_x));
        systemunit.insert(tsyssym.create('ReadStr',in_readstr_x));
        systemunit.insert(tsyssym.create('Ofs',in_ofs_x));
        systemunit.insert(tsyssym.create('SizeOf',in_sizeof_x));
        systemunit.insert(tsyssym.create('BitSizeOf',in_bitsizeof_x));
        systemunit.insert(tsyssym.create('TypeOf',in_typeof_x));
        systemunit.insert(tsyssym.create('Low',in_low_x));
        systemunit.insert(tsyssym.create('High',in_high_x));
        systemunit.insert(tsyssym.create('Slice',in_slice_x));
        systemunit.insert(tsyssym.create('Seg',in_seg_x));
        systemunit.insert(tsyssym.create('Ord',in_ord_x));
        systemunit.insert(tsyssym.create('Pred',in_pred_x));
        systemunit.insert(tsyssym.create('Succ',in_succ_x));
        systemunit.insert(tsyssym.create('Exclude',in_exclude_x_y));
        systemunit.insert(tsyssym.create('Include',in_include_x_y));
        systemunit.insert(tsyssym.create('Pack',in_pack_x_y_z));
        systemunit.insert(tsyssym.create('Unpack',in_unpack_x_y_z));
        systemunit.insert(tsyssym.create('Break',in_break));
        systemunit.insert(tsyssym.create('Exit',in_exit));
        systemunit.insert(tsyssym.create('Continue',in_continue));
        systemunit.insert(tsyssym.create('Leave',in_leave)); {macpas only}
        systemunit.insert(tsyssym.create('Cycle',in_cycle)); {macpas only}
        systemunit.insert(tsyssym.create('Dec',in_dec_x));
        systemunit.insert(tsyssym.create('Inc',in_inc_x));
        systemunit.insert(tsyssym.create('Str',in_str_x_string));
        systemunit.insert(tsyssym.create('Assert',in_assert_x_y));
        systemunit.insert(tsyssym.create('Val',in_val_x));
        systemunit.insert(tsyssym.create('Addr',in_addr_x));
        systemunit.insert(tsyssym.create('TypeInfo',in_typeinfo_x));
        systemunit.insert(tsyssym.create('SetLength',in_setlength_x));
        systemunit.insert(tsyssym.create('Copy',in_copy_x));
        systemunit.insert(tsyssym.create('Initialize',in_initialize_x));
        systemunit.insert(tsyssym.create('Finalize',in_finalize_x));
        systemunit.insert(tsyssym.create('Length',in_length_x));
        systemunit.insert(tsyssym.create('New',in_new_x));
        systemunit.insert(tsyssym.create('Dispose',in_dispose_x));
{$if defined(x86) or defined(arm)}
        systemunit.insert(tsyssym.create('Get_Frame',in_get_frame));
{$endif defined(x86) or defined(arm)}
{$ifdef SUPPORT_UNALIGNED}
        systemunit.insert(tsyssym.create('Unaligned',in_unaligned_x));
{$endif SUPPORT_UNALIGNED}
      end;


    procedure create_intern_types;
      {
        all the types inserted into the system unit
      }

        function addtype(const s:string;def:tdef):ttypesym;
        begin
          result:=ttypesym.create(s,def);
          systemunit.insert(result);
        end;

        procedure create_fpu_types;
        begin
          if init_settings.fputype<>fpu_none then
            begin
              s32floattype:=tfloatdef.create(s32real);
              s64floattype:=tfloatdef.create(s64real);
              s80floattype:=tfloatdef.create(s80real);
            end else begin
              s32floattype:=nil;
              s64floattype:=nil;
              s80floattype:=nil;
            end;
        end;

      var
        hrecst : trecordsymtable;
      begin
        symtablestack.push(systemunit);
        cundefinedtype:=tundefineddef.create;
        cformaltype:=tformaldef.create(false);
        ctypedformaltype:=tformaldef.create(true);
        voidtype:=torddef.create(uvoid,0,0);
        u8inttype:=torddef.create(u8bit,0,255);
        s8inttype:=torddef.create(s8bit,int64(-128),127);
        u16inttype:=torddef.create(u16bit,0,65535);
        s16inttype:=torddef.create(s16bit,int64(-32768),32767);
        u32inttype:=torddef.create(u32bit,0,high(longword));
        s32inttype:=torddef.create(s32bit,int64(low(longint)),int64(high(longint)));
        u64inttype:=torddef.create(u64bit,low(qword),high(qword));
        s64inttype:=torddef.create(s64bit,low(int64),high(int64));
        booltype:=torddef.create(pasbool,0,1);
        bool8type:=torddef.create(bool8bit,low(int64),high(int64));
        bool16type:=torddef.create(bool16bit,low(int64),high(int64));
        bool32type:=torddef.create(bool32bit,low(int64),high(int64));
        bool64type:=torddef.create(bool64bit,low(int64),high(int64));
        cchartype:=torddef.create(uchar,0,255);
        cwidechartype:=torddef.create(uwidechar,0,65535);
        cshortstringtype:=tstringdef.createshort(255);
        { should we give a length to the default long and ansi string definition ?? }
        clongstringtype:=tstringdef.createlong(-1);
        cansistringtype:=tstringdef.createansi;
        if target_info.system in system_windows then
          cwidestringtype:=tstringdef.createwide
        else
          cwidestringtype:=tstringdef.createunicode;
        cunicodestringtype:=tstringdef.createunicode;
        { length=0 for shortstring is open string (needed for readln(string) }
        openshortstringtype:=tstringdef.createshort(0);
        openchararraytype:=tarraydef.create(0,-1,s32inttype);
        tarraydef(openchararraytype).elementdef:=cchartype;
{$ifdef x86}
        create_fpu_types;
        if target_info.system<>system_x86_64_win64 then
          s64currencytype:=tfloatdef.create(s64currency)
        else
          begin
            s64currencytype:=torddef.create(scurrency,low(int64),high(int64));
            pbestrealtype:=@s64floattype;
          end;
{$endif x86}
{$ifdef powerpc}
        create_fpu_types;
        s64currencytype:=torddef.create(scurrency,low(int64),high(int64));
{$endif powerpc}
{$ifdef POWERPC64}
        create_fpu_types;
        s64currencytype:=torddef.create(scurrency,low(int64),high(int64));
{$endif POWERPC64}
{$ifdef sparc}
        create_fpu_types;
        s64currencytype:=torddef.create(scurrency,low(int64),high(int64));
{$endif sparc}
{$ifdef m68k}
        create_fpu_types;
        s64currencytype:=torddef.create(scurrency,low(int64),high(int64));
{$endif}
{$ifdef arm}
        create_fpu_types;
        s64currencytype:=torddef.create(scurrency,low(int64),high(int64));
{$endif arm}
{$ifdef avr}
        s32floattype:=tfloatdef.create(s32real);
        s64floattype:=tfloatdef.create(s64real);
        s80floattype:=tfloatdef.create(s80real);
        s64currencytype:=torddef.create(scurrency,low(int64),high(int64));
{$endif avr}
{$ifdef cpu64bitaddr}
        uinttype:=u64inttype;
        sinttype:=s64inttype;
        ptruinttype:=u64inttype;
        ptrsinttype:=s64inttype;
{$endif cpu64bitaddr}
{$ifdef cpu32bit}
        uinttype:=u32inttype;
        sinttype:=s32inttype;
        ptruinttype:=u32inttype;
        ptrsinttype:=s32inttype;
{$endif cpu32bit}
{$ifdef cpu16bit}
        uinttype:=u16inttype;
        sinttype:=s16inttype;
        ptruinttype:=u16inttype;
        ptrsinttype:=s16inttype;
{$endif cpu16bit}
        { some other definitions }
        voidpointertype:=tpointerdef.create(voidtype);
        charpointertype:=tpointerdef.create(cchartype);
        widecharpointertype:=tpointerdef.create(cwidechartype);
        voidfarpointertype:=tpointerdef.createfar(voidtype);
        cfiletype:=tfiledef.createuntyped;
        cvarianttype:=tvariantdef.create(vt_normalvariant);
        colevarianttype:=tvariantdef.create(vt_olevariant);

{$ifdef cpufpemu}
        { Normal types }
        (* we use the same types as without emulator, the only
          difference is that direct calls to the emulator are generated
        if (cs_fp_emulation in current_settings.moduleswitches) then
          begin
            addtype('Single',s32floattype);
            { extended size is the best real type for the target }
            addtype('Real',s32floattype);
            pbestrealtype:=@s32floattype;
            { extended size is the best real type for the target }
            addtype('Extended',pbestrealtype^);
          end
        else
        *)
{$endif cpufpemu}
        if init_settings.fputype <> fpu_none then
          begin
            addtype('Single',s32floattype);
            addtype('Double',s64floattype);
            { extended size is the best real type for the target }
            addtype('Extended',pbestrealtype^);
          end;
{$ifdef x86}
        if target_info.system<>system_x86_64_win64 then
          addtype('Comp',tfloatdef.create(s64comp));
{$endif x86}
        addtype('Currency',s64currencytype);
        addtype('Pointer',voidpointertype);
{$ifdef x86}
        addtype('FarPointer',voidfarpointertype);
{$endif x86}
        addtype('ShortString',cshortstringtype);
{$ifdef support_longstring}
        addtype('LongString',clongstringtype);
{$endif support_longstring}
        addtype('AnsiString',cansistringtype);
        addtype('WideString',cwidestringtype);
        addtype('UnicodeString',cunicodestringtype);

        addtype('OpenString',openshortstringtype);
        addtype('Boolean',booltype);
        addtype('ByteBool',bool8type);
        addtype('WordBool',bool16type);
        addtype('LongBool',bool32type);
        addtype('QWordBool',bool64type);
        addtype('Byte',u8inttype);
        addtype('ShortInt',s8inttype);
        addtype('Word',u16inttype);
        addtype('SmallInt',s16inttype);
        addtype('LongWord',u32inttype);
        addtype('LongInt',s32inttype);
        addtype('QWord',u64inttype);
        addtype('Int64',s64inttype);
        addtype('Char',cchartype);
        addtype('WideChar',cwidechartype);
        addtype('Text',tfiledef.createtext);
        addtype('TypedFile',tfiledef.createtyped(voidtype));
        addtype('Variant',cvarianttype);
        addtype('OleVariant',colevarianttype);
        { Internal types }
        addtype('$undefined',cundefinedtype);
        addtype('$formal',cformaltype);
        addtype('$typedformal',ctypedformaltype);
        addtype('$void',voidtype);
        addtype('$byte',u8inttype);
        addtype('$shortint',s8inttype);
        addtype('$word',u16inttype);
        addtype('$smallint',s16inttype);
        addtype('$ulong',u32inttype);
        addtype('$longint',s32inttype);
        addtype('$qword',u64inttype);
        addtype('$int64',s64inttype);
        addtype('$char',cchartype);
        addtype('$widechar',cwidechartype);
        addtype('$shortstring',cshortstringtype);
        addtype('$longstring',clongstringtype);
        addtype('$ansistring',cansistringtype);
        addtype('$widestring',cwidestringtype);
        addtype('$unicodestring',cwidestringtype);
        addtype('$openshortstring',openshortstringtype);
        addtype('$boolean',booltype);
        addtype('$boolean8',bool8type);
        addtype('$boolean16',bool16type);
        addtype('$boolean32',bool32type);
        addtype('$boolean64',bool64type);
        addtype('$void_pointer',voidpointertype);
        addtype('$char_pointer',charpointertype);
        addtype('$widechar_pointer',widecharpointertype);
        addtype('$void_farpointer',voidfarpointertype);
        addtype('$openchararray',openchararraytype);
        addtype('$file',cfiletype);
        addtype('$variant',cvarianttype);
        addtype('$olevariant',cvarianttype);
        if init_settings.fputype<>fpu_none then
          begin
            addtype('$s32real',s32floattype);
            addtype('$s64real',s64floattype);
            addtype('$s80real',s80floattype);
          end;
        addtype('$s64currency',s64currencytype);
        { Add a type for virtual method tables }
        hrecst:=trecordsymtable.create(current_settings.packrecords);
        vmttype:=trecorddef.create(hrecst);
        pvmttype:=tpointerdef.create(vmttype);
        { can't use addtype for pvmt because the rtti of the pointed
          type is not available. The rtti for pvmt will be written implicitly
          by thev tblarray below }
        systemunit.insert(ttypesym.create('$pvmt',pvmttype));
        hrecst.insertfield(tfieldvarsym.create('$length',vs_value,ptrsinttype,[]));
        hrecst.insertfield(tfieldvarsym.create('$mlength',vs_value,ptrsinttype,[]));
        hrecst.insertfield(tfieldvarsym.create('$parent',vs_value,pvmttype,[]));
        { it seems vmttype is used both for TP objects and Delphi classes,
          so the next entry could either be the first virtual method (vm1)
          (object) or the class name (class). We can't easily create separate
          vtable formats for both, as gdb is hard coded to search for
          __vtbl_ptr_type in all cases (JM) }
        hrecst.insertfield(tfieldvarsym.create('$vm1_or_classname',vs_value,tpointerdef.create(cshortstringtype),[]));
        vmtarraytype:=tarraydef.create(0,0,s32inttype);
        tarraydef(vmtarraytype).elementdef:=voidpointertype;
        hrecst.insertfield(tfieldvarsym.create('$__pfn',vs_value,vmtarraytype,[]));
        addtype('$__vtbl_ptr_type',vmttype);
        vmtarraytype:=tarraydef.create(0,1,s32inttype);
        tarraydef(vmtarraytype).elementdef:=pvmttype;
        addtype('$vtblarray',vmtarraytype);
        { Add a type for methodpointers }
        hrecst:=trecordsymtable.create(1);
        hrecst.insertfield(tfieldvarsym.create('$proc',vs_value,voidpointertype,[]));
        hrecst.insertfield(tfieldvarsym.create('$self',vs_value,voidpointertype,[]));
        methodpointertype:=trecorddef.create(hrecst);
        addtype('$methodpointer',methodpointertype);
        symtablestack.pop(systemunit);
      end;


    procedure load_intern_types;
      {
        Load all default definitions for consts from the system unit
      }

        procedure loadtype(const s:string;var def:tdef);
        var
          srsym : ttypesym;
        begin
          srsym:=search_system_type(s);
          def:=srsym.typedef;
        end;

      var
        oldcurrentmodule : tmodule;
      begin
        if target_info.system=system_x86_64_win64 then
          pbestrealtype:=@s64floattype;

        oldcurrentmodule:=current_module;
        set_current_module(nil);
        loadtype('byte',u8inttype);
        loadtype('shortint',s8inttype);
        loadtype('word',u16inttype);
        loadtype('smallint',s16inttype);
        loadtype('ulong',u32inttype);
        loadtype('longint',s32inttype);
        loadtype('qword',u64inttype);
        loadtype('int64',s64inttype);
        loadtype('undefined',cundefinedtype);
        loadtype('formal',cformaltype);
        loadtype('typedformal',ctypedformaltype);
        loadtype('void',voidtype);
        loadtype('char',cchartype);
        loadtype('widechar',cwidechartype);
        loadtype('shortstring',cshortstringtype);
        loadtype('longstring',clongstringtype);
        loadtype('ansistring',cansistringtype);
        loadtype('widestring',cwidestringtype);
        loadtype('unicodestring',cunicodestringtype);
        loadtype('openshortstring',openshortstringtype);
        loadtype('openchararray',openchararraytype);
        if init_settings.fputype <> fpu_none then
          begin
            loadtype('s32real',s32floattype);
            loadtype('s64real',s64floattype);
            loadtype('s80real',s80floattype);
          end;
        loadtype('s64currency',s64currencytype);
        loadtype('boolean',booltype);
        loadtype('boolean8',bool8type);
        loadtype('boolean16',bool16type);
        loadtype('boolean32',bool32type);
        loadtype('boolean64',bool64type);
        loadtype('void_pointer',voidpointertype);
        loadtype('char_pointer',charpointertype);
        loadtype('widechar_pointer',widecharpointertype);
        loadtype('void_farpointer',voidfarpointertype);
        loadtype('file',cfiletype);
        loadtype('pvmt',pvmttype);
        loadtype('vtblarray',vmtarraytype);
        loadtype('__vtbl_ptr_type',vmttype);
        loadtype('variant',cvarianttype);
        loadtype('olevariant',colevarianttype);
        loadtype('methodpointer',methodpointertype);
        loadtype('HRESULT',hresultdef);
{$ifdef cpu64bitaddr}
        uinttype:=u64inttype;
        sinttype:=s64inttype;
        ptruinttype:=u64inttype;
        ptrsinttype:=s64inttype;
{$endif cpu64bitaddr}
{$ifdef cpu32bit}
        uinttype:=u32inttype;
        sinttype:=s32inttype;
        ptruinttype:=u32inttype;
        ptrsinttype:=s32inttype;
{$endif cpu32bit}
{$ifdef cpu16bit}
        uinttype:=u16inttype;
        sinttype:=s16inttype;
        ptruinttype:=u16inttype;
        ptrsinttype:=s16inttype;
{$endif cpu16bit}
        set_current_module(oldcurrentmodule);
      end;


    procedure registernodes;
      {
        Register all possible nodes in the nodeclass array that
        will be used for loading the nodes from a ppu
      }
      begin
        nodeclass[addn]:=caddnode;
        nodeclass[muln]:=caddnode;
        nodeclass[subn]:=caddnode;
        nodeclass[divn]:=cmoddivnode;
        nodeclass[symdifn]:=caddnode;
        nodeclass[modn]:=cmoddivnode;
        nodeclass[assignn]:=cassignmentnode;
        nodeclass[loadn]:=cloadnode;
        nodeclass[rangen]:=crangenode;
        nodeclass[ltn]:=caddnode;
        nodeclass[lten]:=caddnode;
        nodeclass[gtn]:=caddnode;
        nodeclass[gten]:=caddnode;
        nodeclass[equaln]:=caddnode;
        nodeclass[unequaln]:=caddnode;
        nodeclass[inn]:=cinnode;
        nodeclass[orn]:=caddnode;
        nodeclass[xorn]:=caddnode;
        nodeclass[shrn]:=cshlshrnode;
        nodeclass[shln]:=cshlshrnode;
        nodeclass[slashn]:=caddnode;
        nodeclass[andn]:=caddnode;
        nodeclass[subscriptn]:=csubscriptnode;
        nodeclass[derefn]:=cderefnode;
        nodeclass[addrn]:=caddrnode;
        nodeclass[ordconstn]:=cordconstnode;
        nodeclass[typeconvn]:=ctypeconvnode;
        nodeclass[calln]:=ccallnode;
        nodeclass[callparan]:=ccallparanode;
        nodeclass[realconstn]:=crealconstnode;
        nodeclass[unaryminusn]:=cunaryminusnode;
        nodeclass[asmn]:=casmnode;
        nodeclass[vecn]:=cvecnode;
        nodeclass[pointerconstn]:=cpointerconstnode;
        nodeclass[stringconstn]:=cstringconstnode;
        nodeclass[notn]:=cnotnode;
        nodeclass[inlinen]:=cinlinenode;
        nodeclass[niln]:=cnilnode;
        nodeclass[errorn]:=cerrornode;
        nodeclass[typen]:=ctypenode;
        nodeclass[setelementn]:=csetelementnode;
        nodeclass[setconstn]:=csetconstnode;
        nodeclass[blockn]:=cblocknode;
        nodeclass[statementn]:=cstatementnode;
        nodeclass[ifn]:=cifnode;
        nodeclass[breakn]:=cbreaknode;
        nodeclass[continuen]:=ccontinuenode;
        nodeclass[whilerepeatn]:=cwhilerepeatnode;
        nodeclass[forn]:=cfornode;
        nodeclass[exitn]:=cexitnode;
        nodeclass[withn]:=cwithnode;
        nodeclass[casen]:=ccasenode;
        nodeclass[labeln]:=clabelnode;
        nodeclass[goton]:=cgotonode;
        nodeclass[tryexceptn]:=ctryexceptnode;
        nodeclass[raisen]:=craisenode;
        nodeclass[tryfinallyn]:=ctryfinallynode;
        nodeclass[onn]:=connode;
        nodeclass[isn]:=cisnode;
        nodeclass[asn]:=casnode;
        nodeclass[starstarn]:=caddnode;
        nodeclass[arrayconstructorn]:=carrayconstructornode;
        nodeclass[arrayconstructorrangen]:=carrayconstructorrangenode;
        nodeclass[tempcreaten]:=ctempcreatenode;
        nodeclass[temprefn]:=ctemprefnode;
        nodeclass[tempdeleten]:=ctempdeletenode;
        nodeclass[addoptn]:=caddnode;
        nodeclass[nothingn]:=cnothingnode;
        nodeclass[loadvmtaddrn]:=cloadvmtaddrnode;
        nodeclass[guidconstn]:=cguidconstnode;
        nodeclass[rttin]:=crttinode;
        nodeclass[loadparentfpn]:=cloadparentfpnode;
      end;


    procedure registertais;
      {
        Register all possible tais in the taiclass array that
        will be used for loading the tais from a ppu
      }
      begin
        aiclass[ait_none]:=nil;
        aiclass[ait_align]:=tai_align;
        aiclass[ait_section]:=tai_section;
        aiclass[ait_comment]:=tai_comment;
        aiclass[ait_string]:=tai_string;
        aiclass[ait_instruction]:=taicpu;
        aiclass[ait_datablock]:=tai_datablock;
        aiclass[ait_symbol]:=tai_symbol;
        aiclass[ait_symbol_end]:=tai_symbol_end;
        aiclass[ait_directive]:=tai_directive;
        aiclass[ait_label]:=tai_label;
        aiclass[ait_const]:=tai_const;
        aiclass[ait_real_32bit]:=tai_real_32bit;
        aiclass[ait_real_64bit]:=tai_real_64bit;
        aiclass[ait_real_80bit]:=tai_real_80bit;
        aiclass[ait_comp_64bit]:=tai_comp_64bit;
        aiclass[ait_stab]:=tai_stab;
        aiclass[ait_force_line]:=tai_force_line;
        aiclass[ait_function_name]:=tai_function_name;
{$ifdef alpha}
          { the follow is for the DEC Alpha }
        aiclass[ait_frame]:=tai_frame;
        aiclass[ait_ent]:=tai_ent;
{$endif alpha}
{$ifdef m68k}
{ TODO: FIXME: tai_labeled_instruction doesn't exists}
//        aiclass[ait_labeled_instruction]:=tai_labeled_instruction;
{$endif m68k}
{$ifdef ia64}
        aiclass[ait_bundle]:=tai_bundle;
        aiclass[ait_stop]:=tai_stop;
{$endif ia64}
{$ifdef SPARC}
//        aiclass[ait_labeled_instruction]:=tai_labeled_instruction;
{$endif SPARC}
        aiclass[ait_cutobject]:=tai_cutobject;
        aiclass[ait_regalloc]:=tai_regalloc;
        aiclass[ait_tempalloc]:=tai_tempalloc;
        aiclass[ait_marker]:=tai_marker;
      end;

end.