fpc/compiler/psystem.pas

{
    $Id$
    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 insertinternsyms(p : tsymtable);
    procedure insert_intern_types(p : tsymtable);

    procedure readconstdefs;
    procedure createconstdefs;

    procedure registernodes;
    procedure registertais;


implementation

    uses
      globals,globtype,
      symconst,symtype,symsym,symdef,symtable,
      aasmtai,aasmcpu,
{$ifdef GDB}
      gdb,
{$endif GDB}
      node,nbas,nflw,nset,ncon,ncnv,nld,nmem,ncal,nmat,nadd,ninl,nopt
{$ifdef Delphi}
      ,dmisc
      ,sysutils
{$endif}
      ;


    procedure insertinternsyms(p : tsymtable);
      {
        all intern procedures for the system unit
      }
      begin
        p.insert(tsyssym.create('Concat',in_concat_x));
        p.insert(tsyssym.create('Write',in_write_x));
        p.insert(tsyssym.create('WriteLn',in_writeln_x));
        p.insert(tsyssym.create('Assigned',in_assigned_x));
        p.insert(tsyssym.create('Read',in_read_x));
        p.insert(tsyssym.create('ReadLn',in_readln_x));
        p.insert(tsyssym.create('Ofs',in_ofs_x));
        p.insert(tsyssym.create('SizeOf',in_sizeof_x));
        p.insert(tsyssym.create('TypeOf',in_typeof_x));
        p.insert(tsyssym.create('Low',in_low_x));
        p.insert(tsyssym.create('High',in_high_x));
        p.insert(tsyssym.create('Seg',in_seg_x));
        p.insert(tsyssym.create('Ord',in_ord_x));
        p.insert(tsyssym.create('Pred',in_pred_x));
        p.insert(tsyssym.create('Succ',in_succ_x));
        p.insert(tsyssym.create('Exclude',in_exclude_x_y));
        p.insert(tsyssym.create('Include',in_include_x_y));
        p.insert(tsyssym.create('Break',in_break));
        p.insert(tsyssym.create('Exit',in_exit));
        p.insert(tsyssym.create('Continue',in_continue));
        p.insert(tsyssym.create('Dec',in_dec_x));
        p.insert(tsyssym.create('Inc',in_inc_x));
        p.insert(tsyssym.create('Str',in_str_x_string));
        p.insert(tsyssym.create('Assert',in_assert_x_y));
        p.insert(tsyssym.create('Val',in_val_x));
        p.insert(tsyssym.create('Addr',in_addr_x));
        p.insert(tsyssym.create('TypeInfo',in_typeinfo_x));
        p.insert(tsyssym.create('SetLength',in_setlength_x));
        p.insert(tsyssym.create('Copy',in_copy_x));
        p.insert(tsyssym.create('Finalize',in_finalize_x));
        p.insert(tsyssym.create('Length',in_length_x));
        p.insert(tsyssym.create('New',in_new_x));
        p.insert(tsyssym.create('Dispose',in_dispose_x));
      end;


    procedure insert_intern_types(p : tsymtable);
      {
        all the types inserted into the system unit
      }

        function addtype(const s:string;const t:ttype):ttypesym;
        begin
          result:=ttypesym.create(s,t);
          p.insert(result);
          { add init/final table if required }
          if t.def.needs_inittable then
           generate_inittable(result);
        end;

        procedure adddef(const s:string;def:tdef);
        var
          t : ttype;
        begin
          t.setdef(def);
          p.insert(ttypesym.create(s,t));
        end;

      var
        { several defs to simulate more or less C++ objects for GDB }
        vmttype,
        vmtarraytype : ttype;
        hrecst : trecordsymtable;
      begin
{$ifdef cpufpemu}
        { Normal types }
        if (cs_fp_emulation in aktmoduleswitches) then
          begin
            addtype('Single',s32floattype);
            { extended size is the best real type for the target }
            addtype('Real',s32floattype);
            pbestrealtype:=@s32floattype;
            { extended size is the best real type for the target }
            addtype('Extended',pbestrealtype^);
          end
        else
{$endif cpufpemu}
          begin
            addtype('Single',s32floattype);
            addtype('Double',s64floattype);
            { extended size is the best real type for the target }
            addtype('Extended',pbestrealtype^);
            addtype('Real',s64floattype);
          end;
{$ifdef x86}
        adddef('Comp',tfloatdef.create(s64comp));
{$endif x86}
        addtype('Currency',s64currencytype);
        addtype('Pointer',voidpointertype);
        addtype('FarPointer',voidfarpointertype);
        addtype('ShortString',cshortstringtype);
        addtype('LongString',clongstringtype);
        addtype('AnsiString',cansistringtype);
        addtype('WideString',cwidestringtype);
        addtype('Boolean',booltype);
        addtype('ByteBool',booltype);
        adddef('WordBool',torddef.create(bool16bit,0,1));
        adddef('LongBool',torddef.create(bool32bit,0,1));
        addtype('Char',cchartype);
        addtype('WideChar',cwidechartype);
        adddef('Text',tfiledef.createtext);
        addtype('Longword',u32bittype);
        addtype('QWord',cu64bittype);
        addtype('Int64',cs64bittype);
        adddef('TypedFile',tfiledef.createtyped(voidtype));
        addtype('Variant',cvarianttype);
        { Internal types }
        addtype('$formal',cformaltype);
        addtype('$void',voidtype);
        addtype('$byte',u8bittype);
        addtype('$word',u16bittype);
        addtype('$ulong',u32bittype);
        addtype('$longint',s32bittype);
        addtype('$qword',cu64bittype);
        addtype('$int64',cs64bittype);
        addtype('$char',cchartype);
        addtype('$widechar',cwidechartype);
        addtype('$shortstring',cshortstringtype);
        addtype('$longstring',clongstringtype);
        addtype('$ansistring',cansistringtype);
        addtype('$widestring',cwidestringtype);
        addtype('$openshortstring',openshortstringtype);
        addtype('$boolean',booltype);
        addtype('$void_pointer',voidpointertype);
        addtype('$char_pointer',charpointertype);
        addtype('$void_farpointer',voidfarpointertype);
        addtype('$openchararray',openchararraytype);
        addtype('$file',cfiletype);
        addtype('$variant',cvarianttype);
        addtype('$s32real',s32floattype);
        addtype('$s64real',s64floattype);
        addtype('$s80real',s80floattype);
        addtype('$s64currency',s64currencytype);
        { Add a type for virtual method tables }
        hrecst:=trecordsymtable.create;
        vmttype.setdef(trecorddef.create(hrecst));
        pvmttype.setdef(tpointerdef.create(vmttype));
        hrecst.insertfield(tvarsym.create('$parent',vs_value,pvmttype));
        hrecst.insertfield(tvarsym.create('$length',vs_value,s32bittype));
        hrecst.insertfield(tvarsym.create('$mlength',vs_value,s32bittype));
        vmtarraytype.setdef(tarraydef.create(0,1,s32bittype));
        tarraydef(vmtarraytype.def).setelementtype(voidpointertype);
        hrecst.insertfield(tvarsym.create('$__pfn',vs_value,vmtarraytype));
        addtype('$__vtbl_ptr_type',vmttype);
        addtype('$pvmt',pvmttype);
        vmtarraytype.setdef(tarraydef.create(0,1,s32bittype));
        tarraydef(vmtarraytype.def).setelementtype(pvmttype);
        addtype('$vtblarray',vmtarraytype);
        { Add a type for methodpointers }
        hrecst:=trecordsymtable.create;
        hrecst.insertfield(tvarsym.create('$proc',vs_value,voidpointertype));
        hrecst.insertfield(tvarsym.create('$self',vs_value,voidpointertype));
        methodpointertype.setdef(trecorddef.create(hrecst));
        addtype('$methodpointer',methodpointertype);
      { Add functions that require compiler magic }
        insertinternsyms(p);
      end;


    procedure readconstdefs;
      {
        Load all default definitions for consts from the system unit
      }
      begin
        globaldef('byte',u8bittype);
        globaldef('word',u16bittype);
        globaldef('ulong',u32bittype);
        globaldef('longint',s32bittype);
        globaldef('qword',cu64bittype);
        globaldef('int64',cs64bittype);
        globaldef('formal',cformaltype);
        globaldef('void',voidtype);
        globaldef('char',cchartype);
        globaldef('widechar',cwidechartype);
        globaldef('shortstring',cshortstringtype);
        globaldef('longstring',clongstringtype);
        globaldef('ansistring',cansistringtype);
        globaldef('widestring',cwidestringtype);
        globaldef('openshortstring',openshortstringtype);
        globaldef('openchararray',openchararraytype);
        globaldef('s32real',s32floattype);
        globaldef('s64real',s64floattype);
        globaldef('s80real',s80floattype);
        globaldef('s64currency',s64currencytype);
        globaldef('boolean',booltype);
        globaldef('void_pointer',voidpointertype);
        globaldef('char_pointer',charpointertype);
        globaldef('void_farpointer',voidfarpointertype);
        globaldef('file',cfiletype);
        globaldef('pvmt',pvmttype);
        globaldef('variant',cvarianttype);
        globaldef('methodpointer',methodpointertype);
{$ifdef i386}
        ordpointertype:=u32bittype;
        defaultordconsttype:=s32bittype;
{$endif i386}
{$ifdef x86_64}
        ordpointertype:=cu64bittype;
        defaultordconsttype:=cs64bittype;
{$endif x86_64}
{$ifdef powerpc}
        ordpointertype:=u32bittype;
        defaultordconsttype:=s32bittype;
{$endif powerpc}
{$ifdef sparc}
        ordpointertype:=u32bittype;
        defaultordconsttype:=s32bittype;
{$endif sparc}
{$ifdef m68k}
        ordpointertype:=u32bittype;
        defaultordconsttype:=s32bittype;
{$endif}
      end;


    procedure createconstdefs;
      {
        Create all default definitions for consts for the system unit
      }
      var
        oldregisterdef : boolean;
      begin
        { create definitions for constants }
        oldregisterdef:=registerdef;
        registerdef:=false;
        cformaltype.setdef(tformaldef.create);
        voidtype.setdef(torddef.create(uvoid,0,0));
        u8bittype.setdef(torddef.create(u8bit,0,255));
        u16bittype.setdef(torddef.create(u16bit,0,65535));
        u32bittype.setdef(torddef.create(u32bit,0,high(longword)));
        s32bittype.setdef(torddef.create(s32bit,low(longint),high(longint)));
        cu64bittype.setdef(torddef.create(u64bit,low(qword),TConstExprInt(high(qword))));
        cs64bittype.setdef(torddef.create(s64bit,low(int64),high(int64)));
        booltype.setdef(torddef.create(bool8bit,0,1));
        cchartype.setdef(torddef.create(uchar,0,255));
        cwidechartype.setdef(torddef.create(uwidechar,0,65535));
        cshortstringtype.setdef(tstringdef.createshort(255));
        { should we give a length to the default long and ansi string definition ?? }
        clongstringtype.setdef(tstringdef.createlong(-1));
        cansistringtype.setdef(tstringdef.createansi(-1));
        cwidestringtype.setdef(tstringdef.createwide(-1));
        { length=0 for shortstring is open string (needed for readln(string) }
        openshortstringtype.setdef(tstringdef.createshort(0));
        openchararraytype.setdef(tarraydef.create(0,-1,s32bittype));
        tarraydef(openchararraytype.def).setelementtype(cchartype);
{$ifdef x86}
  {$ifdef i386}
        ordpointertype:=u32bittype;
        defaultordconsttype:=s32bittype;
  {$endif i386}
  {$ifdef x86_64}
        ordpointertype:=cu64bittype;
        defaultordconsttype:=cs64bittype;
  {$endif x86_64}
        s32floattype.setdef(tfloatdef.create(s32real));
        s64floattype.setdef(tfloatdef.create(s64real));
        s80floattype.setdef(tfloatdef.create(s80real));
        s64currencytype.setdef(tfloatdef.create(s64currency));
{$endif x86}
{$ifdef powerpc}
        ordpointertype:=u32bittype;
        defaultordconsttype:=s32bittype;
        s32floattype.setdef(tfloatdef.create(s32real));
        s64floattype.setdef(tfloatdef.create(s64real));
        s80floattype.setdef(tfloatdef.create(s80real));
        s64currencytype.setdef(torddef.create(scurrency,low(int64),high(int64)));
{$endif powerpc}
{$ifdef sparc}
        ordpointertype:=u32bittype;
        defaultordconsttype:=s32bittype;
        s32floattype.setdef(tfloatdef.create(s32real));
        s64floattype.setdef(tfloatdef.create(s64real));
        s80floattype.setdef(tfloatdef.create(s80real));
        s64currencytype.setdef(torddef.create(scurrency,low(int64),high(int64)));
{$endif sparc}
{$ifdef m68k}
        ordpointertype:=u32bittype;
        defaultordconsttype:=s32bittype;
        s32floattype.setdef(tfloatdef.create(s32real));
        s64floattype.setdef(tfloatdef.create(s64real));
        s80floattype.setdef(tfloatdef.create(s80real));
        s64currencytype.setdef(torddef.create(scurrency,low(int64),high(int64)));
{$endif}
        { some other definitions }
        voidpointertype.setdef(tpointerdef.create(voidtype));
        charpointertype.setdef(tpointerdef.create(cchartype));
        voidfarpointertype.setdef(tpointerdef.createfar(voidtype));
        cfiletype.setdef(tfiledef.createuntyped);
        cvarianttype.setdef(tvariantdef.create);
        registerdef:=oldregisterdef;
      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[doubleaddrn]:=cdoubleaddrnode;
        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[caretn]:=caddnode;
        nodeclass[starstarn]:=caddnode;
        nodeclass[procinlinen]:=cprocinlinenode;
        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;
      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_direct]:=tai_direct;
        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_label]:=tai_label;
        aiclass[ait_const_32bit]:=tai_const;
        aiclass[ait_const_16bit]:=tai_const;
        aiclass[ait_const_8bit]:=tai_const;
        aiclass[ait_const_symbol]:=tai_const_symbol;
        aiclass[ait_const_rva]:=tai_const_symbol;
        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;
{$ifdef GDB}
        aiclass[ait_stabn]:=tai_stabn;
        aiclass[ait_stabs]:=tai_stabs;
        aiclass[ait_force_line]:=tai_force_line;
        aiclass[ait_stab_function_name]:=tai_stab_function_name;
{$endif GDB}
{$ifdef alpha}
          { the follow is for the DEC Alpha }
        aiclass[ait_frame]:=tai_frame;
        aiclass[ait_ent]:=tai_ent;
{$endif alpha}
{$ifdef m68k}
{$warning 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_cut]:=tai_cut;
        aiclass[ait_regalloc]:=tai_regalloc;
        aiclass[ait_tempalloc]:=tai_tempalloc;
        aiclass[ait_marker]:=tai_marker;
      end;

end.
{
  $Log$
  Revision 1.51  2003-05-25 11:34:17  peter
    * methodpointer self pushing fixed

  Revision 1.50  2003/05/13 19:14:41  peter
    * failn removed
    * inherited result code check moven to pexpr

  Revision 1.49  2003/05/09 17:47:03  peter
    * self moved to hidden parameter
    * removed hdisposen,hnewn,selfn

  Revision 1.48  2003/05/01 07:59:42  florian
    * introduced defaultordconsttype to decribe the default size of ordinal constants
      on 64 bit CPUs it's equal to cs64bitdef while on 32 bit CPUs it's equal to s32bitdef
    + added defines CPU32 and CPU64 for 32 bit and 64 bit CPUs
    * int64s/qwords are allowed as for loop counter on 64 bit CPUs

  Revision 1.47  2003/04/25 20:59:34  peter
    * removed funcretn,funcretsym, function result is now in varsym
      and aliases for result and function name are added using absolutesym
    * vs_hidden parameter for funcret passed in parameter
    * vs_hidden fixes
    * writenode changed to printnode and released from extdebug
    * -vp option added to generate a tree.log with the nodetree
    * nicer printnode for statements, callnode

  Revision 1.46  2003/04/23 21:10:54  peter
    * fix compile for ppc,sparc,m68k

  Revision 1.45  2003/04/23 20:16:04  peter
    + added currency support based on int64
    + is_64bit for use in cg units instead of is_64bitint
    * removed cgmessage from n386add, replace with internalerrors

  Revision 1.44  2002/12/06 16:56:59  peter
    * only compile cs_fp_emulation support when cpufpuemu is defined
    * define cpufpuemu for m68k only

  Revision 1.43  2002/11/30 21:32:26  carl
    + Add loading of softfpu in emulation mode
    + Correct routine call for softfpu
    * Extended type must also be defined even with softfpu

  Revision 1.42  2002/10/05 12:43:27  carl
    * fixes for Delphi 6 compilation
     (warning : Some features do not work under Delphi)

  Revision 1.41  2002/10/02 18:20:53  peter
    * Copy() is now internal syssym that calls compilerprocs

  Revision 1.40  2002/09/27 21:13:29  carl
    * low-highval always checked if limit ober 2GB is reached (to avoid overflow)

  Revision 1.39  2002/09/07 20:46:10  carl
    * cardinal -> longword

  Revision 1.38  2002/08/23 13:11:11  mazen
  fixed compilation problem related to tai_labeled_instruction

  Revision 1.37  2002/08/18 20:06:25  peter
    * inlining is now also allowed in interface
    * renamed write/load to ppuwrite/ppuload
    * tnode storing in ppu
    * nld,ncon,nbas are already updated for storing in ppu

  Revision 1.36  2002/08/15 19:10:35  peter
    * first things tai,tnode storing in ppu

  Revision 1.35  2002/08/14 19:14:39  carl
    + fpu emulation support (generic and untested)

  Revision 1.34  2002/08/13 18:01:52  carl
    * rename swatoperands to swapoperands
    + m68k first compilable version (still needs a lot of testing):
        assembler generator, system information , inline
        assembler reader.

  Revision 1.33  2002/08/11 15:28:00  florian
    + support of explicit type case <any ordinal type>->pointer
      (delphi mode only)

  Revision 1.32  2002/07/25 17:54:24  carl
   + Extended is now CPU dependant (equal to bestrealtype)

  Revision 1.30  2002/07/07 09:52:32  florian
    * powerpc target fixed, very simple units can be compiled
    * some basic stuff for better callparanode handling, far from being finished

  Revision 1.29  2002/07/06 20:18:47  carl
  + more SPARC patches from Mazen

  Revision 1.28  2002/07/04 20:43:02  florian
    * first x86-64 patches

  Revision 1.27  2002/07/01 16:23:54  peter
    * cg64 patch
    * basics for currency
    * asnode updates for class and interface (not finished)

  Revision 1.26  2002/05/18 13:34:16  peter
    * readded missing revisions

  Revision 1.25  2002/05/16 19:46:44  carl
  + defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
  + try to fix temp allocation (still in ifdef)
  + generic constructor calls
  + start of tassembler / tmodulebase class cleanup

  Revision 1.23  2002/05/12 16:53:09  peter
    * moved entry and exitcode to ncgutil and cgobj
    * foreach gets extra argument for passing local data to the
      iterator function
    * -CR checks also class typecasts at runtime by changing them
      into as
    * fixed compiler to cycle with the -CR option
    * fixed stabs with elf writer, finally the global variables can
      be watched
    * removed a lot of routines from cga unit and replaced them by
      calls to cgobj
    * u32bit-s32bit updates for and,or,xor nodes. When one element is
      u32bit then the other is typecasted also to u32bit without giving
      a rangecheck warning/error.
    * fixed pascal calling method with reversing also the high tree in
      the parast, detected by tcalcst3 test

  Revision 1.22  2002/01/24 12:33:53  jonas
    * adapted ranges of native types to int64 (e.g. high cardinal is no
      longer longint($ffffffff), but just $fffffff in psystem)
    * small additional fix in 64bit rangecheck code generation for 32 bit
      processors
    * adaption of ranges required the matching talgorithm used for selecting
      which overloaded procedure to call to be adapted. It should now always
      select the closest match for ordinal parameters.
    + inttostr(qword) in sysstr.inc/sysstrh.inc
    + abs(int64), sqr(int64), sqr(qword) in systemh.inc/generic.inc (previous
      fixes were required to be able to add them)
    * is_in_limit() moved from ncal to types unit, should always be used
      instead of direct comparisons of low/high values of orddefs because
      qword is a special case

}