freepascal.compiler/compiler/ngtcon.pp

{
    Copyright (c) 1998-2011 by Florian Klaempfl, Jonas Maebe

    Generates code/nodes for typed constant declarations

    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 ngtcon;

{$i fpcdefs.inc}

interface

    uses
      globtype,
      aasmdata,
      node,nbas,
      symtype, symbase, symdef,symsym;


    type
      ttypedconstbuilder = class
       protected
        current_old_block_type : tblock_type;
        tcsym: tstaticvarsym;

        { this procedure reads typed constants }
        procedure read_typed_const_data(def:tdef);

        procedure parse_orddef(def: torddef);
        procedure parse_floatdef(def: tfloatdef);
        procedure parse_classrefdef(def: tclassrefdef);
        procedure parse_pointerdef(def: tpointerdef);
        procedure parse_setdef(def: tsetdef);
        procedure parse_enumdef(def: tenumdef);
        procedure parse_stringdef(def: tstringdef);
        procedure parse_arraydef(def:tarraydef);virtual;abstract;
        procedure parse_procvardef(def:tprocvardef);virtual;abstract;
        procedure parse_recorddef(def:trecorddef);virtual;abstract;
        procedure parse_objectdef(def:tobjectdef);virtual;abstract;

        procedure tc_emit_orddef(def: torddef; var node: tnode);virtual;abstract;
        procedure tc_emit_floatdef(def: tfloatdef; var node: tnode);virtual;abstract;
        procedure tc_emit_classrefdef(def: tclassrefdef; var node: tnode);virtual;abstract;
        procedure tc_emit_pointerdef(def: tpointerdef; var node: tnode);virtual;abstract;
        procedure tc_emit_setdef(def: tsetdef; var node: tnode);virtual;abstract;
        procedure tc_emit_enumdef(def: tenumdef; var node: tnode);virtual;abstract;
        procedure tc_emit_stringdef(def: tstringdef; var node: tnode);virtual;abstract;
       public
        constructor create(sym: tstaticvarsym);
//        function parse_into_nodetree: tnode;
      end;

      { should be changed into nested type of tasmlisttypedconstbuilder when
        possible }
      tbitpackedval = record
        curval, nextval: aword;
        curbitoffset: smallint;
        loadbitsize,packedbitsize: byte;
      end;

      tasmlisttypedconstbuilder = class(ttypedconstbuilder)
       private
        list: tasmlist;
        curoffset: asizeint;

        function parse_single_packed_const(def: tdef; var bp: tbitpackedval): boolean;
       protected

        procedure parse_packed_array_def(def: tarraydef);
        procedure parse_arraydef(def:tarraydef);override;
        procedure parse_procvardef(def:tprocvardef);override;
        procedure parse_recorddef(def:trecorddef);override;
        procedure parse_objectdef(def:tobjectdef);override;

        procedure tc_emit_orddef(def: torddef; var node: tnode);override;
        procedure tc_emit_floatdef(def: tfloatdef; var node: tnode); override;
        procedure tc_emit_classrefdef(def: tclassrefdef; var node: tnode);override;
        procedure tc_emit_pointerdef(def: tpointerdef; var node: tnode);override;
        procedure tc_emit_setdef(def: tsetdef; var node: tnode);override;
        procedure tc_emit_enumdef(def: tenumdef; var node: tnode);override;
        procedure tc_emit_stringdef(def: tstringdef; var node: tnode);override;
       public
        constructor create(sym: tstaticvarsym);
        function parse_into_asmlist: tasmlist;
      end;

      tnodetreetypedconstbuilder = class(ttypedconstbuilder)
       private
        resultblock: tblocknode;
        statmnt: tstatementnode;

        { when parsing a record, the base nade becomes a loadnode of the record,
          etc. }
        basenode: tnode;

       protected
        procedure parse_arraydef(def:tarraydef);override;
        procedure parse_procvardef(def:tprocvardef);override;
        procedure parse_recorddef(def:trecorddef);override;
        procedure parse_objectdef(def:tobjectdef);override;

        procedure tc_emit_orddef(def: torddef; var node: tnode);override;
        procedure tc_emit_floatdef(def: tfloatdef; var node: tnode); override;
        procedure tc_emit_classrefdef(def: tclassrefdef; var node: tnode);override;
        procedure tc_emit_pointerdef(def: tpointerdef; var node: tnode);override;
        procedure tc_emit_setdef(def: tsetdef; var node: tnode);override;
        procedure tc_emit_enumdef(def: tenumdef; var node: tnode);override;
        procedure tc_emit_stringdef(def: tstringdef; var node: tnode);override;
       public
        constructor create(sym: tstaticvarsym; previnit: tnode);
        destructor destroy;override;
        function parse_into_nodetree: tnode;
      end;
implementation

uses
   SysUtils,
   systems,tokens,verbose,constexp,
   cutils,globals,widestr,scanner,
   symconst,symtable,
   aasmbase,aasmtai,aasmcpu,defutil,defcmp,
   { pass 1 }
   htypechk,procinfo,
   nmat,nadd,ncal,nmem,nset,ncnv,ninl,ncon,nld,nflw,
   { parser specific stuff }
   pbase,pexpr,pdecvar,
   { codegen }
   cpuinfo,cgbase,dbgbase,
   wpobase,asmutils
   ;

{$maxfpuregisters 0}

{*****************************************************************************
                             read typed const
*****************************************************************************}

      procedure ttypedconstbuilder.parse_orddef(def:torddef);
        var
          n : tnode;
        begin
           n:=comp_expr(true,false);
           { for C-style booleans, true=-1 and false=0) }
           if is_cbool(def) then
             inserttypeconv(n,def);
           tc_emit_orddef(def,n);
           n.free;
        end;

      procedure ttypedconstbuilder.parse_floatdef(def:tfloatdef);
        var
          n : tnode;
        begin
          n:=comp_expr(true,false);
          tc_emit_floatdef(def,n);
          n.free;
        end;

      procedure ttypedconstbuilder.parse_classrefdef(def:tclassrefdef);
        var
          n : tnode;
        begin
          n:=comp_expr(true,false);
          case n.nodetype of
            loadvmtaddrn:
              begin
                { update wpo info }
                if not assigned(current_procinfo) or
                   (po_inline in current_procinfo.procdef.procoptions) or
                   wpoinfomanager.symbol_live(current_procinfo.procdef.mangledname) then
                  tobjectdef(tclassrefdef(n.resultdef).pointeddef).register_maybe_created_object_type;
              end;
          end;
          tc_emit_classrefdef(def,n);
          n.free;
        end;

      procedure ttypedconstbuilder.parse_pointerdef(def:tpointerdef);
        var
          p: tnode;
        begin
          p:=comp_expr(true,false);
          tc_emit_pointerdef(def,p);
          p.free;
        end;

      procedure ttypedconstbuilder.parse_setdef(def:tsetdef);
        var
          p : tnode;
        begin
          p:=comp_expr(true,false);
          tc_emit_setdef(def,p);
          p.free;
        end;

      procedure ttypedconstbuilder.parse_enumdef(def:tenumdef);
        var
          p : tnode;
        begin
          p:=comp_expr(true,false);
          tc_emit_enumdef(def,p);
          p.free;
        end;

      procedure ttypedconstbuilder.parse_stringdef(def:tstringdef);
        var
          n : tnode;
        begin
          n:=comp_expr(true,false);
          tc_emit_stringdef(def,n);
          n.free;
        end;

    { ttypedconstbuilder }

    procedure ttypedconstbuilder.read_typed_const_data(def:tdef);
      var
       prev_old_block_type,
       old_block_type: tblock_type;
      begin
        old_block_type:=block_type;
        prev_old_block_type:=current_old_block_type;
        current_old_block_type:=old_block_type;
        block_type:=bt_const;
        case def.typ of
          orddef :
            parse_orddef(torddef(def));
          floatdef :
            parse_floatdef(tfloatdef(def));
          classrefdef :
            parse_classrefdef(tclassrefdef(def));
          pointerdef :
            parse_pointerdef(tpointerdef(def));
          setdef :
            parse_setdef(tsetdef(def));
          enumdef :
            parse_enumdef(tenumdef(def));
          stringdef :
            parse_stringdef(tstringdef(def));
          arraydef :
            parse_arraydef(tarraydef(def));
          procvardef:
            parse_procvardef(tprocvardef(def));
          recorddef:
            parse_recorddef(trecorddef(def));
          objectdef:
            parse_objectdef(tobjectdef(def));
          errordef:
            begin
               { try to consume something useful }
               if token=_LKLAMMER then
                 consume_all_until(_RKLAMMER)
               else
                 consume_all_until(_SEMICOLON);
            end;
          else
            Message(parser_e_type_const_not_possible);
        end;
        block_type:=old_block_type;
        current_old_block_type:=prev_old_block_type;
      end;


    constructor ttypedconstbuilder.create(sym: tstaticvarsym);
      begin
        tcsym:=sym;
      end;


{*****************************************************************************
                          Bitpacked value helpers
*****************************************************************************}

    procedure initbitpackval(out bp: tbitpackedval; packedbitsize: byte);
      begin
        bp.curval:=0;
        bp.nextval:=0;
        bp.curbitoffset:=0;
        bp.packedbitsize:=packedbitsize;
        bp.loadbitsize:=packedbitsloadsize(bp.packedbitsize)*8;
      end;


{$ifopt r+}
{$define rangeon}
{$r-}
{$endif}

{$ifopt q+}
{$define overflowon}
{$q-}
{$endif}
    { (values between quotes below refer to fields of bp; fields not         }
    {  mentioned are unused by this routine)                                 }
    { bitpacks "value" as bitpacked value of bitsize "packedbitsize" into    }
    { "curval", which has already been filled up to "curbitoffset", and      }
    { stores the spillover if any into "nextval". It also updates            }
    { curbitoffset to reflect how many bits of currval are now used (can be  }
    { > AIntBits in case of spillover)                                       }
    procedure bitpackval(value: aword; var bp: tbitpackedval);
      var
        shiftcount: longint;
      begin
        if (target_info.endian=endian_big) then
          begin
            { bitpacked format: left-aligned (i.e., "big endian bitness") }
            bp.curval:=bp.curval or ((value shl (AIntBits-bp.packedbitsize)) shr bp.curbitoffset);
            shiftcount:=((AIntBits-bp.packedbitsize)-bp.curbitoffset);
            { carry-over to the next element? }
            if (shiftcount<0) then
              bp.nextval:=(value and ((aword(1) shl (-shiftcount))-1)) shl
                          (AIntBits+shiftcount)
          end
        else
          begin
            { bitpacked format: right aligned (i.e., "little endian bitness") }
            bp.curval:=bp.curval or (value shl bp.curbitoffset);
            { carry-over to the next element? }
            if (bp.curbitoffset+bp.packedbitsize>AIntBits) then
              bp.nextval:=value shr (AIntBits-bp.curbitoffset)
          end;
        inc(bp.curbitoffset,bp.packedbitsize);
      end;

{$ifdef rangeon}
{$r+}
{$undef rangeon}
{$endif}

{$ifdef overflowon}
{$q+}
{$undef overflowon}
{$endif}


    procedure flush_packed_value(list: tasmlist; var bp: tbitpackedval);
      var
        bitstowrite: longint;
        writeval : byte;
      begin
        if (bp.curbitoffset < AIntBits) then
          begin
            { forced flush -> write multiple of loadsize }
            bitstowrite:=align(bp.curbitoffset,bp.loadbitsize);
            bp.curbitoffset:=0;
          end
        else
          begin
            bitstowrite:=AIntBits;
            dec(bp.curbitoffset,AIntBits);
          end;
        while (bitstowrite>=8) do
          begin
            if (target_info.endian=endian_little) then
              begin
                { write lowest byte }
                writeval:=byte(bp.curval);
                bp.curval:=bp.curval shr 8;
              end
            else
              begin
                { write highest byte }
                writeval:=bp.curval shr (AIntBits-8);
                bp.curval:=(bp.curval and (not($ff shl (AIntBits-8)))) shl 8;
              end;
            list.concat(tai_const.create_8bit(writeval));
            dec(bitstowrite,8);
          end;
        bp.curval:=bp.nextval;
        bp.nextval:=0;
      end;



    { parses a packed array constant }
    procedure tasmlisttypedconstbuilder.parse_packed_array_def(def: tarraydef);
      var
        i  : aint;
        bp : tbitpackedval;
      begin
        if not(def.elementdef.typ in [orddef,enumdef]) then
          internalerror(2007022010);
        { begin of the array }
        consume(_LKLAMMER);
        initbitpackval(bp,def.elepackedbitsize);
        i:=def.lowrange;
        { can't use for-loop, fails when cross-compiling from }
        { 32 to 64 bit because i is then 64 bit               }
        while (i<def.highrange) do
          begin
            { get next item of the packed array }
            if not parse_single_packed_const(def.elementdef,bp) then
              exit;
            consume(_COMMA);
            inc(i);
          end;
        { final item }
        if not parse_single_packed_const(def.elementdef,bp) then
          exit;
        { flush final incomplete value if necessary }
        if (bp.curbitoffset <> 0) then
          flush_packed_value(list,bp);
        consume(_RKLAMMER);
      end;



    constructor tasmlisttypedconstbuilder.create(sym: tstaticvarsym);
      begin
        inherited;
        list:=tasmlist.create;
        curoffset:=0;
      end;


    procedure tasmlisttypedconstbuilder.tc_emit_stringdef(def: tstringdef; var node: tnode);
      var
        strlength : aint;
        strval    : pchar;
        strch     : char;
        ll        : tasmlabel;
        ca        : pchar;
        winlike   : boolean;
      begin
        { load strval and strlength of the constant tree }
        if (node.nodetype=stringconstn) or is_wide_or_unicode_string(def) or is_constwidecharnode(node) or
          ((node.nodetype=typen) and is_interfacecorba(ttypenode(node).typedef)) then
          begin
            { convert to the expected string type so that
              for widestrings strval is a pcompilerwidestring }
            inserttypeconv(node,def);
            if (not codegenerror) and
               (node.nodetype=stringconstn) then
              begin
                strlength:=tstringconstnode(node).len;
                strval:=tstringconstnode(node).value_str;
              end
            else
              begin
                { an error occurred trying to convert the result to a string }
                strlength:=-1;
                { it's possible that the type conversion could not be
                  evaluated at compile-time }
                if not codegenerror then
                  CGMessage(parser_e_widestring_to_ansi_compile_time);
              end;
          end
        else if is_constcharnode(node) then
          begin
            { strval:=pchar(@tordconstnode(node).value);
              THIS FAIL on BIG_ENDIAN MACHINES PM }
            strch:=chr(tordconstnode(node).value.svalue and $ff);
            strval:=@strch;
            strlength:=1
          end
        else if is_constresourcestringnode(node) then
          begin
            strval:=pchar(tconstsym(tloadnode(node).symtableentry).value.valueptr);
            strlength:=tconstsym(tloadnode(node).symtableentry).value.len;
          end
        else
          begin
            Message(parser_e_illegal_expression);
            strlength:=-1;
          end;
        if strlength>=0 then
          begin
            case def.stringtype of
              st_shortstring:
                begin
                  if strlength>=def.size then
                   begin
                     message2(parser_w_string_too_long,strpas(strval),tostr(def.size-1));
                     strlength:=def.size-1;
                   end;
                  list.concat(Tai_const.Create_8bit(strlength));
                  { this can also handle longer strings }
                  getmem(ca,strlength+1);
                  move(strval^,ca^,strlength);
                  ca[strlength]:=#0;
                  list.concat(Tai_string.Create_pchar(ca,strlength));
                  { fillup with spaces if size is shorter }
                  if def.size>strlength then
                   begin
                     getmem(ca,def.size-strlength);
                     { def.size contains also the leading length, so we }
                     { we have to subtract one                       }
                     fillchar(ca[0],def.size-strlength-1,' ');
                     ca[def.size-strlength-1]:=#0;
                     { this can also handle longer strings }
                     list.concat(Tai_string.Create_pchar(ca,def.size-strlength-1));
                   end;
                end;
              st_ansistring:
                begin
                   { an empty ansi string is nil! }
                   if (strlength=0) then
                     ll := nil
                   else
                     ll := emit_ansistring_const(current_asmdata.asmlists[al_const],strval,strlength);
                   list.concat(Tai_const.Create_sym(ll));
                end;
              st_unicodestring,
              st_widestring:
                begin
                   { an empty wide/unicode string is nil! }
                   if (strlength=0) then
                     ll := nil
                   else
                     begin
                       winlike := (def.stringtype=st_widestring) and (tf_winlikewidestring in target_info.flags);
                       ll := emit_unicodestring_const(current_asmdata.asmlists[al_const],
                              strval,
                              winlike);

                       { Collect Windows widestrings that need initialization at startup.
                         Local initialized vars are excluded because they are initialized
                         at function entry instead. }
                       if winlike and
                          ((tcsym.owner.symtablelevel <= main_program_level) or
                           (current_old_block_type=bt_const)) then
                         begin
                           current_asmdata.WideInits.Concat(
                              TTCInitItem.Create(tcsym, curoffset, ll)
                           );
                           ll := nil;
                           Include(tcsym.varoptions, vo_force_finalize);
                         end;
                     end;
                   list.concat(Tai_const.Create_sym(ll));
                end;
              else
                internalerror(200107081);
            end;
          end;
      end;


    procedure tasmlisttypedconstbuilder.tc_emit_orddef(def: torddef; var node: tnode);
      var
        intvalue: tconstexprint;

      procedure do_error;
        begin
          if is_constnode(node) then
            IncompatibleTypes(node.resultdef, def)
          else
            Message(parser_e_illegal_expression);
        end;

      begin
        case def.ordtype of
           pasbool8,
           bool8bit :
             begin
                if is_constboolnode(node) then
                  list.concat(Tai_const.Create_8bit(byte(tordconstnode(node).value.svalue)))
                else
                  do_error;
             end;
           pasbool16,
           bool16bit :
             begin
                if is_constboolnode(node) then
                  list.concat(Tai_const.Create_16bit(word(tordconstnode(node).value.svalue)))
                else
                  do_error;
             end;
           pasbool32,
           bool32bit :
             begin
                if is_constboolnode(node) then
                  list.concat(Tai_const.Create_32bit(longint(tordconstnode(node).value.svalue)))
                else
                  do_error;
             end;
           pasbool64,
           bool64bit :
             begin
                if is_constboolnode(node) then
                  list.concat(Tai_const.Create_64bit(int64(tordconstnode(node).value.svalue)))
                else
                  do_error;
             end;
           uchar :
             begin
                if is_constcharnode(node) or
                  ((m_delphi in current_settings.modeswitches) and
                   is_constwidecharnode(node) and
                   (tordconstnode(node).value <= 255)) then
                  list.concat(Tai_const.Create_8bit(byte(tordconstnode(node).value.svalue)))
                else
                  do_error;
             end;
           uwidechar :
             begin
                if is_constcharnode(node) then
                  inserttypeconv(node,cwidechartype);
                if is_constwidecharnode(node) then
                  list.concat(Tai_const.Create_16bit(word(tordconstnode(node).value.svalue)))
                else
                  do_error;
             end;
           s8bit,u8bit,
           u16bit,s16bit,
           s32bit,u32bit,
           s64bit,u64bit :
             begin
                if is_constintnode(node) then
                  begin
                    testrange(def,tordconstnode(node).value,false,false);
                    case def.size of
                      1 :
                        list.concat(Tai_const.Create_8bit(byte(tordconstnode(node).value.svalue)));
                      2 :
                        list.concat(Tai_const.Create_16bit(word(tordconstnode(node).value.svalue)));
                      4 :
                        list.concat(Tai_const.Create_32bit(longint(tordconstnode(node).value.svalue)));
                      8 :
                        list.concat(Tai_const.Create_64bit(tordconstnode(node).value.svalue));
                    end;
                  end
                else
                  do_error;
             end;
           scurrency:
             begin
                if is_constintnode(node) then
                  intvalue := tordconstnode(node).value
                { allow bootstrapping }
                else if is_constrealnode(node) then
                  intvalue:=PInt64(@trealconstnode(node).value_currency)^
                else
                  begin
                    intvalue:=0;
                    IncompatibleTypes(node.resultdef, def);
                  end;
               list.concat(Tai_const.Create_64bit(intvalue));
             end;
           else
             internalerror(200611052);
        end;
      end;


    procedure tasmlisttypedconstbuilder.tc_emit_floatdef(def: tfloatdef; var node: tnode);
      var
        value : bestreal;
      begin
        if is_constrealnode(node) then
          value:=trealconstnode(node).value_real
        else if is_constintnode(node) then
          value:=tordconstnode(node).value
        else if is_constnode(node) then
          IncompatibleTypes(node.resultdef, def)
        else
          Message(parser_e_illegal_expression);

        case def.floattype of
           s32real :
             list.concat(Tai_real_32bit.Create(ts32real(value)));
           s64real :
{$ifdef ARM}
             if is_double_hilo_swapped then
               list.concat(Tai_real_64bit.Create_hiloswapped(ts64real(value)))
             else
{$endif ARM}
               list.concat(Tai_real_64bit.Create(ts64real(value)));
           s80real :
             list.concat(Tai_real_80bit.Create(value,s80floattype.size));
           sc80real :
             list.concat(Tai_real_80bit.Create(value,sc80floattype.size));
           s64comp :
             { the round is necessary for native compilers where comp isn't a float }
             list.concat(Tai_comp_64bit.Create(round(value)));
           s64currency:
             list.concat(Tai_comp_64bit.Create(round(value*10000)));
           s128real:
             list.concat(Tai_real_128bit.Create(value));
           else
             internalerror(200611053);
        end;
      end;


    procedure tasmlisttypedconstbuilder.tc_emit_classrefdef(def: tclassrefdef; var node: tnode);
      begin
        case node.nodetype of
          loadvmtaddrn:
            begin
              if not Tobjectdef(tclassrefdef(node.resultdef).pointeddef).is_related(tobjectdef(def.pointeddef)) then
                IncompatibleTypes(node.resultdef, def);
              list.concat(Tai_const.Create_sym(current_asmdata.RefAsmSymbol(Tobjectdef(tclassrefdef(node.resultdef).pointeddef).vmt_mangledname)));
            end;
           niln:
             list.concat(Tai_const.Create_sym(nil));
           else if is_constnode(node) then
             IncompatibleTypes(node.resultdef, def)
           else
             Message(parser_e_illegal_expression);
        end;
      end;


    procedure tasmlisttypedconstbuilder.tc_emit_pointerdef(def: tpointerdef; var node: tnode);
      var
        hp        : tnode;
        srsym     : tsym;
        pd        : tprocdef;
        ca        : pchar;
        pw        : pcompilerwidestring;
        i,len     : longint;
        base,
        offset    : aint;
        v         : Tconstexprint;
        ll        : tasmlabel;
        varalign  : shortint;
      begin
        { remove equal typecasts for pointer/nil addresses }
        if (node.nodetype=typeconvn) then
          with Ttypeconvnode(node) do
            if (left.nodetype in [addrn,niln]) and equal_defs(def,node.resultdef) then
              begin
                hp:=left;
                left:=nil;
                node.free;
                node:=hp;
              end;
        { allows horrible ofs(typeof(TButton)^) code !! }
        if (node.nodetype=addrn) then
          with Taddrnode(node) do
            if left.nodetype=derefn then
              begin
                hp:=tderefnode(left).left;
                tderefnode(left).left:=nil;
                node.free;
                node:=hp;
             end;
        { const pointer ? }
        if (node.nodetype = pointerconstn) then
          begin
            {$if sizeof(TConstPtrUInt)=8}
              list.concat(Tai_const.Create_64bit(int64(tpointerconstnode(node).value)));
            {$else}
              {$if sizeof(TConstPtrUInt)=4}
                list.concat(Tai_const.Create_32bit(longint(tpointerconstnode(node).value)));
              {$else}
                internalerror(200404122);
            {$endif} {$endif}
          end
        { nil pointer ? }
        else if node.nodetype=niln then
          list.concat(Tai_const.Create_sym(nil))
        { maybe pchar ? }
        else
          if is_char(def.pointeddef) and
             (node.nodetype<>addrn) then
            begin
              current_asmdata.getdatalabel(ll);
              list.concat(Tai_const.Create_sym(ll));
              if node.nodetype=stringconstn then
               varalign:=size_2_align(tstringconstnode(node).len)
              else
               varalign:=0;
              varalign:=const_align(varalign);
              new_section(current_asmdata.asmlists[al_const], sec_rodata, ll.name, varalign);
              current_asmdata.asmlists[al_const].concat(Tai_label.Create(ll));
              if node.nodetype=stringconstn then
                begin
                  len:=tstringconstnode(node).len;
                  { For tp7 the maximum lentgh can be 255 }
                  if (m_tp7 in current_settings.modeswitches) and
                     (len>255) then
                   len:=255;
                  getmem(ca,len+2);
                  move(tstringconstnode(node).value_str^,ca^,len+1);
                  current_asmdata.asmlists[al_const].concat(Tai_string.Create_pchar(ca,len+1));
                end
              else
                if is_constcharnode(node) then
                  current_asmdata.asmlists[al_const].concat(Tai_string.Create(char(byte(tordconstnode(node).value.svalue))+#0))
              else
                IncompatibleTypes(node.resultdef, def);
          end
        { maybe pwidechar ? }
        else
          if is_widechar(def.pointeddef) and
             (node.nodetype<>addrn) then
            begin
              current_asmdata.getdatalabel(ll);
              list.concat(Tai_const.Create_sym(ll));
              current_asmdata.asmlists[al_typedconsts].concat(tai_align.create(const_align(sizeof(pint))));
              current_asmdata.asmlists[al_typedconsts].concat(Tai_label.Create(ll));
              if (node.nodetype in [stringconstn,ordconstn]) then
                begin
                  { convert to widestring stringconstn }
                  inserttypeconv(node,cwidestringtype);
                  if (node.nodetype=stringconstn) and
                     (tstringconstnode(node).cst_type in [cst_widestring,cst_unicodestring]) then
                   begin
                     pw:=pcompilerwidestring(tstringconstnode(node).value_str);
                     for i:=0 to tstringconstnode(node).len-1 do
                       current_asmdata.asmlists[al_typedconsts].concat(Tai_const.Create_16bit(pw^.data[i]));
                     { ending #0 }
                     current_asmdata.asmlists[al_typedconsts].concat(Tai_const.Create_16bit(0))
                   end;
                end
              else
                IncompatibleTypes(node.resultdef, def);
          end
        else
          if (node.nodetype=addrn) or
             is_proc2procvar_load(node,pd) then
            begin
              { insert typeconv }
              inserttypeconv(node,def);
              hp:=node;
              while assigned(hp) and (hp.nodetype in [addrn,typeconvn,subscriptn,vecn]) do
                hp:=tunarynode(hp).left;
              if (hp.nodetype=loadn) then
                begin
                  hp:=node;
                  offset:=0;
                  while assigned(hp) and (hp.nodetype<>loadn) do
                    begin
                       case hp.nodetype of
                         vecn :
                           begin
                             case tvecnode(hp).left.resultdef.typ of
                               stringdef :
                                 begin
                                    { this seems OK for shortstring and ansistrings PM }
                                    { it is wrong for widestrings !! }
                                    len:=1;
                                    base:=0;
                                 end;
                               arraydef :
                                 begin
                                    if not is_packed_array(tvecnode(hp).left.resultdef) then
                                      begin
                                        len:=tarraydef(tvecnode(hp).left.resultdef).elesize;
                                        base:=tarraydef(tvecnode(hp).left.resultdef).lowrange;
                                      end
                                    else
                                      begin
                                        Message(parser_e_packed_dynamic_open_array);
                                        len:=1;
                                        base:=0;
                                      end;
                                 end
                               else
                                 Message(parser_e_illegal_expression);
                             end;
                             if is_constintnode(tvecnode(hp).right) then
                               begin
                                 {Prevent overflow.}
                                 v:=get_ordinal_value(tvecnode(hp).right)-base;
                                 if (v<int64(low(offset))) or (v>int64(high(offset))) then
                                   message(parser_e_range_check_error);
                                 if high(offset)-offset div len>v then
                                   inc(offset,len*v.svalue)
                                 else
                                   message(parser_e_range_check_error);
                               end
                             else
                               Message(parser_e_illegal_expression);
                           end;
                         subscriptn :
                           inc(offset,tsubscriptnode(hp).vs.fieldoffset);
                         typeconvn :
                           begin
                             if not(ttypeconvnode(hp).convtype in [tc_equal,tc_proc_2_procvar]) then
                               Message(parser_e_illegal_expression);
                           end;
                         addrn :
                           ;
                         else
                           Message(parser_e_illegal_expression);
                       end;
                       hp:=tunarynode(hp).left;
                    end;
                  srsym:=tloadnode(hp).symtableentry;
                  case srsym.typ of
                    procsym :
                      begin
                        pd:=tprocdef(tprocsym(srsym).ProcdefList[0]);
                        if Tprocsym(srsym).ProcdefList.Count>1 then
                          Message(parser_e_no_overloaded_procvars);
                        if po_abstractmethod in pd.procoptions then
                          Message(type_e_cant_take_address_of_abstract_method)
                        else
                          list.concat(Tai_const.Createname(pd.mangledname,offset));
                      end;
                    staticvarsym :
                      list.concat(Tai_const.Createname(tstaticvarsym(srsym).mangledname,offset));
                    labelsym :
                      list.concat(Tai_const.Createname(tlabelsym(srsym).mangledname,offset));
                    constsym :
                      if tconstsym(srsym).consttyp=constresourcestring then
                        list.concat(Tai_const.Createname(make_mangledname('RESSTR',tconstsym(srsym).owner,tconstsym(srsym).name),sizeof(pint)))
                      else
                        Message(type_e_variable_id_expected);
                    else
                      Message(type_e_variable_id_expected);
                  end;
                end
              else
                Message(parser_e_illegal_expression);
            end
        else
        { allow typeof(Object type)}
          if (node.nodetype=inlinen) and
             (tinlinenode(node).inlinenumber=in_typeof_x) then
            begin
              if (tinlinenode(node).left.nodetype=typen) then
                begin
                  list.concat(Tai_const.createname(
                    tobjectdef(tinlinenode(node).left.resultdef).vmt_mangledname,0));
                end
              else
                Message(parser_e_illegal_expression);
            end
        else
          Message(parser_e_illegal_expression);
      end;


    procedure tasmlisttypedconstbuilder.tc_emit_setdef(def: tsetdef; var node: tnode);
      type
         setbytes = array[0..31] of byte;
         Psetbytes = ^setbytes;
      var
        i: longint;
      begin
        if node.nodetype=setconstn then
          begin
            { be sure to convert to the correct result, else
              it can generate smallset data instead of normalset (PFV) }
            inserttypeconv(node,def);
            { we only allow const sets }
            if (node.nodetype<>setconstn) or
               assigned(tsetconstnode(node).left) then
              Message(parser_e_illegal_expression)
            else
              begin
                tsetconstnode(node).adjustforsetbase;
                { this writing is endian-dependant   }
                if source_info.endian = target_info.endian then
                  begin
                    for i:=0 to node.resultdef.size-1 do
                      list.concat(tai_const.create_8bit(Psetbytes(tsetconstnode(node).value_set)^[i]));
                  end
                else
                  begin
                    for i:=0 to node.resultdef.size-1 do
                      list.concat(tai_const.create_8bit(reverse_byte(Psetbytes(tsetconstnode(node).value_set)^[i])));
                  end;
              end;
          end
        else
          Message(parser_e_illegal_expression);
      end;


    procedure tasmlisttypedconstbuilder.tc_emit_enumdef(def: tenumdef; var node: tnode);
      begin
        if node.nodetype=ordconstn then
          begin
            if equal_defs(node.resultdef,def) or
               is_subequal(node.resultdef,def) then
              begin
                case longint(node.resultdef.size) of
                  1 : list.concat(Tai_const.Create_8bit(Byte(tordconstnode(node).value.svalue)));
                  2 : list.concat(Tai_const.Create_16bit(Word(tordconstnode(node).value.svalue)));
                  4 : list.concat(Tai_const.Create_32bit(Longint(tordconstnode(node).value.svalue)));
                end;
              end
            else
              IncompatibleTypes(node.resultdef,def);
          end
        else
          Message(parser_e_illegal_expression);
      end;


    { parse a single constant and add it to the packed const info  }
    { represented by curval etc (see explanation of bitpackval for }
    { what the different parameters mean)                          }
    function tasmlisttypedconstbuilder.parse_single_packed_const(def: tdef; var bp: tbitpackedval): boolean;
      var
        node: tnode;
      begin
        result:=true;
        node:=comp_expr(true,false);
        if (node.nodetype <> ordconstn) or
           (not equal_defs(node.resultdef,def) and
            not is_subequal(node.resultdef,def)) then
          begin
            node.free;
            incompatibletypes(node.resultdef,def);
            consume_all_until(_SEMICOLON);
            result:=false;
            exit;
          end;
        if (Tordconstnode(node).value<qword(low(Aword))) or (Tordconstnode(node).value>qword(high(Aword))) then
          message(parser_e_range_check_error)
        else
          bitpackval(Tordconstnode(node).value.uvalue,bp);
        if (bp.curbitoffset>=AIntBits) then
          flush_packed_value(list,bp);
        node.free;
      end;


    procedure tasmlisttypedconstbuilder.parse_arraydef(def:tarraydef);
      var
        n : tnode;
        i : longint;
        len : asizeint;
        ch  : array[0..1] of char;
        ca  : pbyte;
        int_const: tai_const;
        char_size: integer;
        oldoffset: asizeint;
      begin
        { dynamic array nil }
        if is_dynamic_array(def) then
          begin
            { Only allow nil initialization }
            consume(_NIL);
            list.concat(Tai_const.Create_sym(nil));
          end
        { packed array constant }
        else if is_packed_array(def) and
                ((def.elepackedbitsize mod 8 <> 0) or
                 not ispowerof2(def.elepackedbitsize div 8,i)) then
          begin
            parse_packed_array_def(def);
          end
        { normal array const between brackets }
        else if try_to_consume(_LKLAMMER) then
          begin
            oldoffset:=curoffset;
            curoffset:=0;
            for i:=def.lowrange to def.highrange-1 do
              begin
                read_typed_const_data(def.elementdef);
                Inc(curoffset,def.elementdef.size);
                if token=_RKLAMMER then
                  begin
                    Message1(parser_e_more_array_elements_expected,tostr(def.highrange-i));
                    consume(_RKLAMMER);
                    exit;
                  end
                else
                  consume(_COMMA);
              end;
            read_typed_const_data(def.elementdef);
            consume(_RKLAMMER);
            curoffset:=oldoffset;
          end
        { if array of char then we allow also a string }
        else if is_anychar(def.elementdef) then
          begin
             char_size:=def.elementdef.size;
             n:=comp_expr(true,false);
             if n.nodetype=stringconstn then
               begin
                 len:=tstringconstnode(n).len;
                  case char_size of
                    1:
                      ca:=pointer(tstringconstnode(n).value_str);
                    2:
                      begin
                        inserttypeconv(n,cwidestringtype);
                        if n.nodetype<>stringconstn then
                          internalerror(2010033003);
                        ca:=pointer(pcompilerwidestring(tstringconstnode(n).value_str)^.data)
                      end;
                    else
                      internalerror(2010033005);
                  end;
                 { For tp7 the maximum lentgh can be 255 }
                 if (m_tp7 in current_settings.modeswitches) and
                    (len>255) then
                  len:=255;
               end
             else if is_constcharnode(n) then
                begin
                  case char_size of
                    1:
                      ch[0]:=chr(tordconstnode(n).value.uvalue and $ff);
                    2:
                      begin
                        inserttypeconv(n,cwidechartype);
                        if not is_constwidecharnode(n) then
                          internalerror(2010033001);
                        widechar(ch):=widechar(tordconstnode(n).value.uvalue and $ffff);
                      end;
                    else
                      internalerror(2010033002);
                  end;
                  ca:=@ch;
                  len:=1;
                end
             else
               begin
                 Message(parser_e_illegal_expression);
                 len:=0;
               end;
             if len>(def.highrange-def.lowrange+1) then
               Message(parser_e_string_larger_array);
             for i:=0 to def.highrange-def.lowrange do
               begin
                 if i<len then
                   begin
                     case char_size of
                       1:
                        int_const:=Tai_const.Create_char(char_size,pbyte(ca)^);
                       2:
                        int_const:=Tai_const.Create_char(char_size,pword(ca)^);
                       else
                         internalerror(2010033004);
                     end;
                     inc(ca, char_size);
                   end
                 else
                   {Fill the remaining positions with #0.}
                   int_const:=Tai_const.Create_char(char_size,0);
                 list.concat(int_const)
               end;
             n.free;
          end
        else
          begin
            { we want the ( }
            consume(_LKLAMMER);
          end;
      end;


    procedure tasmlisttypedconstbuilder.parse_procvardef(def:tprocvardef);
      var
        tmpn,n : tnode;
        pd   : tprocdef;
      begin
        { Procvars and pointers are no longer compatible.  }
        { under tp:  =nil or =var under fpc: =nil or =@var }
        if try_to_consume(_NIL) then
          begin
             list.concat(Tai_const.Create_sym(nil));
             if not def.is_addressonly then
               list.concat(Tai_const.Create_sym(nil));
             exit;
          end;
        { you can't assign a value other than NIL to a typed constant  }
        { which is a "procedure of object", because this also requires }
        { address of an object/class instance, which is not known at   }
        { compile time (JM)                                            }
        if (po_methodpointer in def.procoptions) then
          Message(parser_e_no_procvarobj_const);
        { parse the rest too, so we can continue with error checking }
        getprocvardef:=def;
        n:=comp_expr(true,false);
        getprocvardef:=nil;
        if codegenerror then
          begin
            n.free;
            exit;
          end;
        { let type conversion check everything needed }
        inserttypeconv(n,def);
        if codegenerror then
          begin
            n.free;
            exit;
          end;
        { remove typeconvs, that will normally insert a lea
          instruction which is not necessary for us }
        while n.nodetype=typeconvn do
          begin
            tmpn:=ttypeconvnode(n).left;
            ttypeconvnode(n).left:=nil;
            n.free;
            n:=tmpn;
          end;
        { remove addrn which we also don't need here }
        if n.nodetype=addrn then
          begin
            tmpn:=taddrnode(n).left;
            taddrnode(n).left:=nil;
            n.free;
            n:=tmpn;
          end;
        { we now need to have a loadn with a procsym }
        if (n.nodetype=loadn) and
           (tloadnode(n).symtableentry.typ=procsym) then
          begin
            pd:=tloadnode(n).procdef;
            list.concat(Tai_const.createname(pd.mangledname,0));
            { nested procvar typed consts can only be initialised with nil
              (checked above) or with a global procedure (checked here),
              because in other cases we need a valid frame pointer }
            if is_nested_pd(def) then
              begin
                if is_nested_pd(pd) then
                  Message(parser_e_no_procvarnested_const);
                list.concat(Tai_const.Create_sym(nil));
              end
          end
        else
          Message(parser_e_illegal_expression);
        n.free;
      end;


    procedure tasmlisttypedconstbuilder.parse_recorddef(def:trecorddef);
      var
        n       : tnode;
        symidx  : longint;
        recsym,
        srsym   : tsym;
        hs      : string;
        sorg,s  : TIDString;
        tmpguid : tguid;
        recoffset,
        fillbytes  : aint;
        bp   : tbitpackedval;
        error,
        is_packed: boolean;
        startoffset: aint;

      procedure handle_stringconstn;
        var
          i       : longint;
        begin
          hs:=strpas(tstringconstnode(n).value_str);
          if string2guid(hs,tmpguid) then
            begin
              list.concat(Tai_const.Create_32bit(longint(tmpguid.D1)));
              list.concat(Tai_const.Create_16bit(tmpguid.D2));
              list.concat(Tai_const.Create_16bit(tmpguid.D3));
              for i:=Low(tmpguid.D4) to High(tmpguid.D4) do
                list.concat(Tai_const.Create_8bit(tmpguid.D4[i]));
            end
          else
            Message(parser_e_improper_guid_syntax);
        end;

      var
        i : longint;

      begin
        { GUID }
        if (def=rec_tguid) and (token=_ID) then
          begin
            n:=comp_expr(true,false);
            if n.nodetype=stringconstn then
              handle_stringconstn
            else
              begin
                inserttypeconv(n,rec_tguid);
                if n.nodetype=guidconstn then
                  begin
                    tmpguid:=tguidconstnode(n).value;
                    list.concat(Tai_const.Create_32bit(longint(tmpguid.D1)));
                    list.concat(Tai_const.Create_16bit(tmpguid.D2));
                    list.concat(Tai_const.Create_16bit(tmpguid.D3));
                    for i:=Low(tmpguid.D4) to High(tmpguid.D4) do
                      list.concat(Tai_const.Create_8bit(tmpguid.D4[i]));
                  end
                else
                  Message(parser_e_illegal_expression);
              end;
            n.free;
            exit;
          end;
        if (def=rec_tguid) and ((token=_CSTRING) or (token=_CCHAR)) then
          begin
            n:=comp_expr(true,false);
            inserttypeconv(n,cshortstringtype);
            if n.nodetype=stringconstn then
              handle_stringconstn
            else
              Message(parser_e_illegal_expression);
            n.free;
            exit;
          end;
        { bitpacked record? }
        is_packed:=is_packed_record_or_object(def);
        if (is_packed) then
          begin
            { loadbitsize = 8, bitpacked records are always padded to    }
            { a multiple of a byte. packedbitsize will be set separately }
            { for each field                                             }
            initbitpackval(bp,0);
            bp.loadbitsize:=8;
          end;
        { normal record }
        consume(_LKLAMMER);
        recoffset:=0;
        symidx:=0;
        sorg:='';
        srsym:=tsym(def.symtable.SymList[symidx]);
        recsym := nil;
        startoffset:=curoffset;
        while token<>_RKLAMMER do
          begin
            s:=pattern;
            sorg:=orgpattern;
            consume(_ID);
            consume(_COLON);
            error := false;
            recsym := tsym(def.symtable.Find(s));
            if not assigned(recsym) then
              begin
                Message1(sym_e_illegal_field,sorg);
                error := true;
              end;
            if (not error) and
               (not assigned(srsym) or
                (s <> srsym.name)) then
              { possible variant record (JM) }
              begin
                { All parts of a variant start at the same offset      }
                { Also allow jumping from one variant part to another, }
                { as long as the offsets match                         }
                if (assigned(srsym) and
                    (tfieldvarsym(recsym).fieldoffset = tfieldvarsym(srsym).fieldoffset)) or
                   { srsym is not assigned after parsing w2 in the      }
                   { typed const in the next example:                   }
                   {   type tr = record case byte of                    }
                   {          1: (l1,l2: dword);                        }
                   {          2: (w1,w2: word);                         }
                   {        end;                                        }
                   {   const r: tr = (w1:1;w2:1;l2:5);                  }
                   (tfieldvarsym(recsym).fieldoffset = recoffset) then
                  begin
                    srsym := recsym;
                    symidx := def.symtable.SymList.indexof(srsym)
                  end
                { going backwards isn't allowed in any mode }
                else if (tfieldvarsym(recsym).fieldoffset<recoffset) then
                  begin
                    Message(parser_e_invalid_record_const);
                    error := true;
                  end
                { Delphi allows you to skip fields }
                else if (m_delphi in current_settings.modeswitches) then
                  begin
                    Message1(parser_w_skipped_fields_before,sorg);
                    srsym := recsym;
                  end
                { FPC and TP don't }
                else
                  begin
                    Message1(parser_e_skipped_fields_before,sorg);
                    error := true;
                  end;
              end;
            if error then
              consume_all_until(_SEMICOLON)
            else
              begin
                { if needed fill (alignment) }
                if tfieldvarsym(srsym).fieldoffset>recoffset then
                  begin
                    if not(is_packed) then
                      fillbytes:=tfieldvarsym(srsym).fieldoffset-recoffset
                    else
                      begin
                        flush_packed_value(list,bp);
                        { curoffset is now aligned to the next byte }
                        recoffset:=align(recoffset,8);
                        { offsets are in bits in this case }
                        fillbytes:=(tfieldvarsym(srsym).fieldoffset-recoffset) div 8;
                      end;
                    for i:=1 to fillbytes do
                      list.concat(Tai_const.Create_8bit(0))
                  end;

                { new position }
                recoffset:=tfieldvarsym(srsym).fieldoffset;
                if not(is_packed) then
                  inc(recoffset,tfieldvarsym(srsym).vardef.size)
                 else
                   inc(recoffset,tfieldvarsym(srsym).vardef.packedbitsize);

                { read the data }
                if not(is_packed) or
                   { only orddefs and enumdefs are bitpacked, as in gcc/gpc }
                   not(tfieldvarsym(srsym).vardef.typ in [orddef,enumdef]) then
                  begin
                    if is_packed then
                      begin
                        flush_packed_value(list,bp);
                        recoffset:=align(recoffset,8);
                      end;
                    curoffset:=startoffset+tfieldvarsym(srsym).fieldoffset;
                    read_typed_const_data(tfieldvarsym(srsym).vardef);
                  end
                else
                  begin
                    bp.packedbitsize:=tfieldvarsym(srsym).vardef.packedbitsize;
                    parse_single_packed_const(tfieldvarsym(srsym).vardef,bp);
                  end;

                { keep previous field for checking whether whole }
                { record was initialized (JM)                    }
                recsym := srsym;
                { goto next field }
                inc(symidx);
                if symidx<def.symtable.SymList.Count then
                  srsym:=tsym(def.symtable.SymList[symidx])
                else
                  srsym:=nil;

                if token=_SEMICOLON then
                  consume(_SEMICOLON)
                else if (token=_COMMA) and (m_mac in current_settings.modeswitches) then
                  consume(_COMMA)
                else
                  break;
              end;
          end;
        curoffset:=startoffset;

        { are there any fields left, but don't complain if there only
          come other variant parts after the last initialized field }
        if assigned(srsym) and
           (
            (recsym=nil) or
            (tfieldvarsym(srsym).fieldoffset > tfieldvarsym(recsym).fieldoffset)
           ) then
          Message1(parser_w_skipped_fields_after,sorg);

        if not(is_packed) then
          fillbytes:=def.size-recoffset
        else
          begin
            flush_packed_value(list,bp);
            recoffset:=align(recoffset,8);
            fillbytes:=def.size-(recoffset div 8);
          end;
        for i:=1 to fillbytes do
          list.concat(Tai_const.Create_8bit(0));

        consume(_RKLAMMER);
      end;


    procedure tasmlisttypedconstbuilder.parse_objectdef(def:tobjectdef);
      var
        n      : tnode;
        i      : longint;
        obj    : tobjectdef;
        srsym  : tsym;
        st     : tsymtable;
        objoffset : aint;
        s,sorg : TIDString;
        vmtwritten : boolean;
        startoffset:aint;
      begin
        { no support for packed object }
        if is_packed_record_or_object(def) then
          begin
            Message(type_e_no_const_packed_record);
            exit;
          end;

        { only allow nil for implicit pointer object types }
        if is_implicit_pointer_object_type(def) then
          begin
            n:=comp_expr(true,false);
            if n.nodetype<>niln then
              begin
                Message(parser_e_type_const_not_possible);
                consume_all_until(_SEMICOLON);
              end
            else
              list.concat(Tai_const.Create_sym(nil));
            n.free;
            exit;
          end;

        { for objects we allow it only if it doesn't contain a vmt }
        if (oo_has_vmt in def.objectoptions) and
           (m_fpc in current_settings.modeswitches) then
          begin
            Message(parser_e_type_object_constants);
            exit;
          end;

        consume(_LKLAMMER);
        startoffset:=curoffset;
        objoffset:=0;
        vmtwritten:=false;
        while token<>_RKLAMMER do
          begin
            s:=pattern;
            sorg:=orgpattern;
            consume(_ID);
            consume(_COLON);
            srsym:=nil;
            obj:=tobjectdef(def);
            st:=obj.symtable;
            while (srsym=nil) and assigned(st) do
              begin
                srsym:=tsym(st.Find(s));
                if assigned(obj) then
                  obj:=obj.childof;
                if assigned(obj) then
                  st:=obj.symtable
                else
                  st:=nil;
              end;

            if (srsym=nil) or
               (srsym.typ<>fieldvarsym) then
              begin
                if (srsym=nil) then
                  Message1(sym_e_id_not_found,sorg)
                else
                  Message1(sym_e_illegal_field,sorg);
                consume_all_until(_RKLAMMER);
                break;
              end
            else
              with tfieldvarsym(srsym) do
                begin
                  { check position }
                  if fieldoffset<objoffset then
                    message(parser_e_invalid_record_const);

                  { check in VMT needs to be added for TP mode }
                  if not(vmtwritten) and
                     not(m_fpc in current_settings.modeswitches) and
                     (oo_has_vmt in def.objectoptions) and
                     (def.vmt_offset<fieldoffset) then
                    begin
                      for i:=1 to def.vmt_offset-objoffset do
                        list.concat(tai_const.create_8bit(0));
                      list.concat(tai_const.createname(def.vmt_mangledname,0));
                      { this is more general }
                      objoffset:=def.vmt_offset + sizeof(pint);
                      vmtwritten:=true;
                    end;

                  { if needed fill }
                  if fieldoffset>objoffset then
                    for i:=1 to fieldoffset-objoffset do
                      list.concat(Tai_const.Create_8bit(0));

                  { new position }
                  objoffset:=fieldoffset+vardef.size;

                  { read the data }
                  curoffset:=startoffset+fieldoffset;
                  read_typed_const_data(vardef);

                  if not try_to_consume(_SEMICOLON) then
                    break;
                end;
          end;
        curoffset:=startoffset;
        if not(m_fpc in current_settings.modeswitches) and
           (oo_has_vmt in def.objectoptions) and
           (def.vmt_offset>=objoffset) then
          begin
            for i:=1 to def.vmt_offset-objoffset do
              list.concat(tai_const.create_8bit(0));
            list.concat(tai_const.createname(def.vmt_mangledname,0));
            { this is more general }
            objoffset:=def.vmt_offset + sizeof(pint);
          end;
        for i:=1 to def.size-objoffset do
          list.concat(Tai_const.Create_8bit(0));
        consume(_RKLAMMER);
      end;


    function tasmlisttypedconstbuilder.parse_into_asmlist: tasmlist;
      begin
        read_typed_const_data(tcsym.vardef);
        result:=list;
      end;


    { tnodetreetypedconstbuilder }

    procedure tnodetreetypedconstbuilder.parse_arraydef(def: tarraydef);
      var
        n : tnode;
        i : longint;
        orgbase: tnode;
      begin
        { dynamic array nil }
        if is_dynamic_array(def) then
          begin
            { Only allow nil initialization }
            consume(_NIL);
            addstatement(statmnt,cassignmentnode.create_internal(basenode,cnilnode.create));
            basenode:=nil;
          end
        { array const between brackets }
        else if try_to_consume(_LKLAMMER) then
          begin
            orgbase:=basenode;
            for i:=def.lowrange to def.highrange-1 do
              begin
                basenode:=cvecnode.create(orgbase.getcopy,genintconstnode(i));
                read_typed_const_data(def.elementdef);
                if token=_RKLAMMER then
                  begin
                    Message1(parser_e_more_array_elements_expected,tostr(def.highrange-i));
                    consume(_RKLAMMER);
                    exit;
                  end
                else
                  consume(_COMMA);
              end;
            basenode:=cvecnode.create(orgbase,genintconstnode(def.highrange));
            read_typed_const_data(def.elementdef);
            consume(_RKLAMMER);
          end
        { if array of char then we allow also a string }
        else if is_anychar(def.elementdef) then
          begin
             n:=comp_expr(true,false);
             addstatement(statmnt,cassignmentnode.create_internal(basenode,n));
             basenode:=nil;
          end
        else
          begin
            { we want the ( }
            consume(_LKLAMMER);
          end;
      end;


    procedure tnodetreetypedconstbuilder.parse_procvardef(def: tprocvardef);
      begin
        addstatement(statmnt,cassignmentnode.create_internal(basenode,comp_expr(true,false)));
        basenode:=nil;
      end;


    procedure tnodetreetypedconstbuilder.parse_recorddef(def: trecorddef);
      var
        n,n2    : tnode;
        orgbasenode : tnode;
        symidx  : longint;
        recsym,
        srsym   : tsym;
        sorg,s  : TIDString;
        recoffset : aint;
        error,
        is_packed: boolean;

      procedure handle_stringconstn;
        begin
          addstatement(statmnt,cassignmentnode.create_internal(basenode,n));
          basenode:=nil;
          n:=nil;
        end;

      begin
        { GUID }
        if (def=rec_tguid) and (token=_ID) then
          begin
            n:=comp_expr(true,false);
            if n.nodetype=stringconstn then
              handle_stringconstn
            else
              begin
                inserttypeconv(n,rec_tguid);
                if n.nodetype=guidconstn then
                  begin
                    n2:=cstringconstnode.createstr(guid2string(tguidconstnode(n).value));
                    n.free;
                    n:=n2;
                    handle_stringconstn;
                  end
                else
                  Message(parser_e_illegal_expression);
              end;
            n.free;
            exit;
          end;
        if (def=rec_tguid) and ((token=_CSTRING) or (token=_CCHAR)) then
          begin
            n:=comp_expr(true,false);
            inserttypeconv(n,cshortstringtype);
            if n.nodetype=stringconstn then
              handle_stringconstn
            else
              Message(parser_e_illegal_expression);
            n.free;
            exit;
          end;
        { bitpacked record? }
        is_packed:=is_packed_record_or_object(def);
        { normal record }
        consume(_LKLAMMER);
        recoffset:=0;
        symidx:=0;
        sorg:='';
        srsym:=tsym(def.symtable.SymList[symidx]);
        recsym := nil;
        orgbasenode:=basenode;
        basenode:=nil;
        while token<>_RKLAMMER do
          begin
            s:=pattern;
            sorg:=orgpattern;
            consume(_ID);
            consume(_COLON);
            error := false;
            recsym := tsym(def.symtable.Find(s));
            if not assigned(recsym) then
              begin
                Message1(sym_e_illegal_field,sorg);
                error := true;
              end;
            if (not error) and
               (not assigned(srsym) or
                (s <> srsym.name)) then
              { possible variant record (JM) }
              begin
                { All parts of a variant start at the same offset      }
                { Also allow jumping from one variant part to another, }
                { as long as the offsets match                         }
                if (assigned(srsym) and
                    (tfieldvarsym(recsym).fieldoffset = tfieldvarsym(srsym).fieldoffset)) or
                   { srsym is not assigned after parsing w2 in the      }
                   { typed const in the next example:                   }
                   {   type tr = record case byte of                    }
                   {          1: (l1,l2: dword);                        }
                   {          2: (w1,w2: word);                         }
                   {        end;                                        }
                   {   const r: tr = (w1:1;w2:1;l2:5);                  }
                   (tfieldvarsym(recsym).fieldoffset = recoffset) then
                  begin
                    srsym := recsym;
                    symidx := def.symtable.SymList.indexof(srsym)
                  end
                { going backwards isn't allowed in any mode }
                else if (tfieldvarsym(recsym).fieldoffset<recoffset) then
                  begin
                    Message(parser_e_invalid_record_const);
                    error := true;
                  end
                { Delphi allows you to skip fields }
                else if (m_delphi in current_settings.modeswitches) then
                  begin
                    Message1(parser_w_skipped_fields_before,sorg);
                    srsym := recsym;
                  end
                { FPC and TP don't }
                else
                  begin
                    Message1(parser_e_skipped_fields_before,sorg);
                    error := true;
                  end;
              end;
            if error then
              consume_all_until(_SEMICOLON)
            else
              begin
                { skipping fill bytes happens automatically, since we only
                  initialize the defined fields }
                { new position }
                recoffset:=tfieldvarsym(srsym).fieldoffset;
                if not(is_packed) then
                  inc(recoffset,tfieldvarsym(srsym).vardef.size)
                 else
                   inc(recoffset,tfieldvarsym(srsym).vardef.packedbitsize);

                { read the data }
                if is_packed and
                   { only orddefs and enumdefs are bitpacked, as in gcc/gpc }
                   not(tfieldvarsym(srsym).vardef.typ in [orddef,enumdef]) then
                  recoffset:=align(recoffset,8);
                basenode:=csubscriptnode.create(srsym,orgbasenode.getcopy);
                read_typed_const_data(tfieldvarsym(srsym).vardef);

                { keep previous field for checking whether whole }
                { record was initialized (JM)                    }
                recsym := srsym;
                { goto next field }
                repeat
                  inc(symidx);
                  if symidx<def.symtable.SymList.Count then
                    srsym:=tsym(def.symtable.SymList[symidx])
                  else
                    srsym:=nil;
                until (srsym=nil) or
                      (srsym.typ=fieldvarsym);

                if token=_SEMICOLON then
                  consume(_SEMICOLON)
                else if (token=_COMMA) and (m_mac in current_settings.modeswitches) then
                  consume(_COMMA)
                else
                  break;
              end;
          end;

        { are there any fields left, but don't complain if there only
          come other variant parts after the last initialized field }
        if assigned(srsym) and
           (
            (recsym=nil) or
            (tfieldvarsym(srsym).fieldoffset > tfieldvarsym(recsym).fieldoffset)
           ) then
          Message1(parser_w_skipped_fields_after,sorg);
        orgbasenode.free;
        basenode:=nil;

        consume(_RKLAMMER);
      end;


    procedure tnodetreetypedconstbuilder.parse_objectdef(def: tobjectdef);
      var
        n,
        orgbasenode : tnode;
        obj    : tobjectdef;
        srsym  : tsym;
        st     : tsymtable;
        objoffset : aint;
        s,sorg : TIDString;
      begin
        { no support for packed object }
        if is_packed_record_or_object(def) then
          begin
            Message(type_e_no_const_packed_record);
            exit;
          end;

        { only allow nil for implicit pointer object types }
        if is_implicit_pointer_object_type(def) then
          begin
            n:=comp_expr(true,false);
            if n.nodetype<>niln then
              begin
                Message(parser_e_type_const_not_possible);
                consume_all_until(_SEMICOLON);
              end
            else
              begin
                addstatement(statmnt,cassignmentnode.create_internal(basenode,n));
                n:=nil;
                basenode:=nil;
              end;
            n.free;
            exit;
          end;

        { for objects we allow it only if it doesn't contain a vmt }
        if (oo_has_vmt in def.objectoptions) and
           (m_fpc in current_settings.modeswitches) then
          begin
            Message(parser_e_type_object_constants);
            exit;
          end;

        consume(_LKLAMMER);
        objoffset:=0;
        orgbasenode:=basenode;
        basenode:=nil;
        while token<>_RKLAMMER do
          begin
            s:=pattern;
            sorg:=orgpattern;
            consume(_ID);
            consume(_COLON);
            srsym:=nil;
            obj:=tobjectdef(def);
            st:=obj.symtable;
            while (srsym=nil) and assigned(st) do
              begin
                srsym:=tsym(st.Find(s));
                if assigned(obj) then
                  obj:=obj.childof;
                if assigned(obj) then
                  st:=obj.symtable
                else
                  st:=nil;
              end;

            if (srsym=nil) or
               (srsym.typ<>fieldvarsym) then
              begin
                if (srsym=nil) then
                  Message1(sym_e_id_not_found,sorg)
                else
                  Message1(sym_e_illegal_field,sorg);
                consume_all_until(_RKLAMMER);
                break;
              end
            else
              with tfieldvarsym(srsym) do
                begin
                  { check position }
                  if fieldoffset<objoffset then
                    message(parser_e_invalid_record_const);

                  { new position }
                  objoffset:=fieldoffset+vardef.size;

                  { read the data }
                  basenode:=csubscriptnode.create(srsym,orgbasenode.getcopy);
                  read_typed_const_data(vardef);

                  if not try_to_consume(_SEMICOLON) then
                    break;
                end;
          end;
        consume(_RKLAMMER);
      end;


    procedure tnodetreetypedconstbuilder.tc_emit_orddef(def: torddef; var node: tnode);
      begin
        addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
        basenode:=nil;
        node:=nil;
      end;


    procedure tnodetreetypedconstbuilder.tc_emit_floatdef(def: tfloatdef; var node: tnode);
      begin
        addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
        basenode:=nil;
        node:=nil;
      end;


    procedure tnodetreetypedconstbuilder.tc_emit_classrefdef(def: tclassrefdef; var node: tnode);
      begin
        addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
        basenode:=nil;
        node:=nil;
      end;


    procedure tnodetreetypedconstbuilder.tc_emit_pointerdef(def: tpointerdef; var node: tnode);
      begin
        addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
        basenode:=nil;
        node:=nil;
      end;


    procedure tnodetreetypedconstbuilder.tc_emit_setdef(def: tsetdef; var node: tnode);
      begin
        addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
        basenode:=nil;
        node:=nil;
      end;


    procedure tnodetreetypedconstbuilder.tc_emit_enumdef(def: tenumdef; var node: tnode);
      begin
        addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
        basenode:=nil;
        node:=nil;
      end;


    procedure tnodetreetypedconstbuilder.tc_emit_stringdef(def: tstringdef; var node: tnode);
      begin
        addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
        basenode:=nil;
        node:=nil;
      end;


    constructor tnodetreetypedconstbuilder.create(sym: tstaticvarsym; previnit: tnode);
      begin
        inherited create(sym);
        basenode:=cloadnode.create(sym,sym.owner);
        resultblock:=internalstatements(statmnt);
        if assigned(previnit) then
          addstatement(statmnt,previnit);
      end;


    destructor tnodetreetypedconstbuilder.destroy;
      begin
        freeandnil(basenode);
        freeandnil(resultblock);
        inherited destroy;
      end;


    function tnodetreetypedconstbuilder.parse_into_nodetree: tnode;
      begin
        read_typed_const_data(tcsym.vardef);
        result:=self.resultblock;
        self.resultblock:=nil;
      end;


end.