freepascal.compiler/compiler/ptconst.pas

{
    $Id$
    Copyright (c) 1998-2001 by Florian Klaempfl

    Reads typed constants

    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 ptconst;

{$i defines.inc}

interface

   uses symtype,symsym;

    { this procedure reads typed constants }
    { sym is only needed for ansi strings  }
    { the assembler label is in the middle (PM) }
    procedure readtypedconst(const t:ttype;sym : ttypedconstsym;writable : boolean);

implementation

    uses
{$ifdef Delphi}
       sysutils,
{$else}
       strings,
{$endif Delphi}
       globtype,systems,tokens,cpuinfo,
       cutils,globals,widestr,scanner,
       symconst,symbase,symdef,aasm,cpuasm,types,verbose,
       { pass 1 }
       node,pass_1,
       nmat,nadd,ncal,nmem,nset,ncnv,ninl,ncon,nld,nflw,
       { parser specific stuff }
       pbase,pexpr,
       { codegen }
       cgbase
       ;

{$ifdef fpc}
  {$maxfpuregisters 0}
{$endif fpc}
    { this procedure reads typed constants }
    procedure readtypedconst(const t:ttype;sym : ttypedconstsym;writable : boolean);

      var
         len,base  : longint;
         p,hp,hpstart : tnode;
         i,j,l,offset,
         varalign,
         strlength : longint;
         curconstsegment : TAAsmoutput;
         ll        : tasmlabel;
         s,sorg    : string;
         c         : char;
         ca        : pchar;
         tmpguid   : tguid;
         aktpos    : longint;
         obj       : tobjectdef;
         recsym,
         srsym     : tsym;
         symt      : tsymtable;
         value     : bestreal;
         strval    : pchar;
         pw        : pcompilerwidestring;
         error     : boolean;

      procedure check_range(def:torddef);
        begin
           if ((tordconstnode(p).value>def.high) or
               (tordconstnode(p).value<def.low)) then
             begin
                if (cs_check_range in aktlocalswitches) then
                  Message(parser_e_range_check_error)
                else
                  Message(parser_w_range_check_error);
             end;
        end;

{$R-}  {Range check creates problem with init_8bit(-1) !!}
      begin
         if writable then
           curconstsegment:=datasegment
         else
           curconstsegment:=consts;
         case t.def.deftype of
            orddef:
              begin
                 p:=comp_expr(true);
                 case torddef(t.def).typ of
                    bool8bit :
                      begin
                         if is_constboolnode(p) then
                           curconstSegment.concat(Tai_const.Create_8bit(tordconstnode(p).value))
                         else
                           Message(cg_e_illegal_expression);
                      end;
                    bool16bit :
                      begin
                         if is_constboolnode(p) then
                           curconstSegment.concat(Tai_const.Create_16bit(tordconstnode(p).value))
                         else
                           Message(cg_e_illegal_expression);
                      end;
                    bool32bit :
                      begin
                         if is_constboolnode(p) then
                           curconstSegment.concat(Tai_const.Create_32bit(tordconstnode(p).value))
                         else
                           Message(cg_e_illegal_expression);
                      end;
                    uchar :
                      begin
                         if is_constcharnode(p) then
                           curconstSegment.concat(Tai_const.Create_8bit(tordconstnode(p).value))
                         else
                           Message(cg_e_illegal_expression);
                      end;
                    uwidechar :
                      begin
                         if is_constcharnode(p) then
                           curconstSegment.concat(Tai_const.Create_16bit(tordconstnode(p).value))
                         else
                           Message(cg_e_illegal_expression);
                      end;
                    s8bit,
                    u8bit :
                      begin
                         if is_constintnode(p) then
                           begin
                              curconstSegment.concat(Tai_const.Create_8bit(tordconstnode(p).value));
                              check_range(torddef(t.def));
                           end
                         else
                           Message(cg_e_illegal_expression);
                      end;
                    u16bit,
                    s16bit :
                      begin
                         if is_constintnode(p) then
                           begin
                             curconstSegment.concat(Tai_const.Create_16bit(tordconstnode(p).value));
                             check_range(torddef(t.def));
                           end
                         else
                           Message(cg_e_illegal_expression);
                     end;
                    s32bit,
                    u32bit :
                      begin
                         if is_constintnode(p) then
                           begin
                              curconstSegment.concat(Tai_const.Create_32bit(tordconstnode(p).value));
                              if torddef(t.def).typ<>u32bit then
                               check_range(torddef(t.def));
                           end
                         else
                           Message(cg_e_illegal_expression);
                      end;
                    s64bit,
                    u64bit:
                      begin
                         if is_constintnode(p) then
                           begin
                              if target_info.endian = endian_little then
                                begin
                                  curconstSegment.concat(Tai_const.Create_32bit(tordconstnode(p).value));
                                  if (tordconstnode(p).value<0) and (torddef(t.def).typ = s64bit) then
                                    curconstSegment.concat(Tai_const.Create_32bit(-1))
                                  else
                                    curconstSegment.concat(Tai_const.Create_32bit(0));
                                end
                              else
                                begin
                                  if (tordconstnode(p).value<0) and (torddef(t.def).typ = s64bit) then
                                    curconstSegment.concat(Tai_const.Create_32bit(-1))
                                  else
                                    curconstSegment.concat(Tai_const.Create_32bit(0));
                                  curconstSegment.concat(Tai_const.Create_32bit(tordconstnode(p).value));
                                end;
                           end
                         else
                           Message(cg_e_illegal_expression);
                      end;
                    else
                      internalerror(3799);
                 end;
                 p.free;
              end;
         floatdef:
           begin
              p:=comp_expr(true);
              if is_constrealnode(p) then
                value:=trealconstnode(p).value_real
              else if is_constintnode(p) then
                value:=tordconstnode(p).value
              else
                Message(cg_e_illegal_expression);

              case tfloatdef(t.def).typ of
                 s32real :
                   curconstSegment.concat(Tai_real_32bit.Create(value));
                 s64real :
                   curconstSegment.concat(Tai_real_64bit.Create(value));
                 s80real :
                   curconstSegment.concat(Tai_real_80bit.Create(value));
                 s64comp :
                   curconstSegment.concat(Tai_comp_64bit.Create(value));
                 else
                   internalerror(18);
              end;
              p.free;
           end;
         classrefdef:
           begin
              p:=comp_expr(true);
              case p.nodetype of
                 loadvmtn:
                   begin
                      if not(tobjectdef(tclassrefdef(p.resulttype.def).pointertype.def).is_related(
                        tobjectdef(tclassrefdef(t.def).pointertype.def))) then
                        Message(cg_e_illegal_expression);
                      curconstSegment.concat(Tai_const_symbol.Create(newasmsymbol(tobjectdef(
                        tclassrefdef(p.resulttype.def).pointertype.def).vmt_mangledname)));
                   end;
                 niln:
                   curconstSegment.concat(Tai_const.Create_32bit(0));
                 else Message(cg_e_illegal_expression);
              end;
              p.free;
           end;
         pointerdef:
           begin
              p:=comp_expr(true);
              if (p.nodetype=typeconvn) and
                 (ttypeconvnode(p).left.nodetype in [addrn,niln]) and
                 is_equal(t.def,p.resulttype.def) then
                begin
                   hp:=ttypeconvnode(p).left;
                   ttypeconvnode(p).left:=nil;
                   p.free;
                   p:=hp;
                end;
              { allows horrible ofs(typeof(TButton)^) code !! }
              if (p.nodetype=addrn) and
                 (taddrnode(p).left.nodetype=derefn) then
                begin
                   hp:=tderefnode(taddrnode(p).left).left;
                   tderefnode(taddrnode(p).left).left:=nil;
                   p.free;
                   p:=hp;
                end;
              { const pointer ? }
              if (p.nodetype = pointerconstn) then
                curconstsegment.concat(Tai_const.Create_32bit(
                  tpointerconstnode(p).value))
              { nil pointer ? }
              else if p.nodetype=niln then
                curconstSegment.concat(Tai_const.Create_32bit(0))
              { maybe pchar ? }
              else
                if is_char(tpointerdef(t.def).pointertype.def) and
                   (p.nodetype<>addrn) then
                  begin
                    getdatalabel(ll);
                    curconstSegment.concat(Tai_const_symbol.Create(ll));
                    if p.nodetype=stringconstn then
                     varalign:=size_2_align(tstringconstnode(p).len)
                    else
                     varalign:=0;
                    varalign:=used_align(varalign,aktalignment.varalignmin,aktalignment.varalignmax);
                    Consts.concat(Tai_align.Create(varalign));
                    Consts.concat(Tai_label.Create(ll));
                    if p.nodetype=stringconstn then
                      begin
                        len:=tstringconstnode(p).len;
                        { For tp7 the maximum lentgh can be 255 }
                        if (m_tp in aktmodeswitches) and
                           (len>255) then
                         len:=255;
                        getmem(ca,len+2);
                        move(tstringconstnode(p).value_str^,ca^,len+1);
                        Consts.concat(Tai_string.Create_length_pchar(ca,len+1));
                      end
                    else
                      if is_constcharnode(p) then
                        Consts.concat(Tai_string.Create(char(byte(tordconstnode(p).value))+#0))
                    else
                      Message(cg_e_illegal_expression);
                end
              { maybe pwidechar ? }
              else
                if is_widechar(tpointerdef(t.def).pointertype.def) and
                   (p.nodetype<>addrn) then
                  begin
                    getdatalabel(ll);
                    curconstSegment.concat(Tai_const_symbol.Create(ll));
                    Consts.concat(Tai_label.Create(ll));
                    if (p.nodetype in [stringconstn,ordconstn]) then
                      begin
                        { convert to widestring stringconstn }
                        inserttypeconv(p,cwidestringtype);
                        if (p.nodetype=stringconstn) and
                           (tstringconstnode(p).st_type=st_widestring) then
                         begin
                           pw:=pcompilerwidestring(tstringconstnode(p).value_str);
                           for i:=0 to tstringconstnode(p).len-1 do
                            Consts.concat(Tai_const.Create_16bit(pw^.data[i]));
                           { ending #0 }
                           Consts.concat(Tai_const.Create_16bit(0))
                         end;
                      end
                    else
                      Message(cg_e_illegal_expression);
                end
              else
                if p.nodetype=addrn then
                  begin
                    inserttypeconv(p,t);
                    { if a typeconv node was inserted then check if it was an tc_equal. If
                      true then we remove the node. If not tc_equal then we leave the typeconvn
                      and the nodetype=loadn will always be false and generate the error (PFV) }
                    if (p.nodetype=typeconvn) then
                     begin
                       if (ttypeconvnode(p).convtype=tc_equal) then
                        hpstart:=taddrnode(ttypeconvnode(p).left).left
                       else
                        hpstart:=p;
                     end
                    else
                     hpstart:=taddrnode(p).left;
                    hp:=hpstart;
                    while assigned(hp) and (hp.nodetype in [subscriptn,vecn]) do
                      hp:=tbinarynode(hp).left;
                    if (hp.nodetype=loadn) then
                      begin
                        hp:=hpstart;
                        offset:=0;
                        while assigned(hp) and (hp.nodetype<>loadn) do
                          begin
                             case hp.nodetype of
                               vecn :
                                 begin
                                   case tvecnode(hp).left.resulttype.def.deftype of
                                     stringdef :
                                       begin
                                          { this seems OK for shortstring and ansistrings PM }
                                          { it is wrong for widestrings !! }
                                          len:=1;
                                          base:=0;
                                       end;
                                     arraydef :
                                       begin
                                          len:=tarraydef(tvecnode(hp).left.resulttype.def).elesize;
                                          base:=tarraydef(tvecnode(hp).left.resulttype.def).lowrange;
                                       end
                                     else
                                       Message(cg_e_illegal_expression);
                                   end;
                                   if is_constintnode(tvecnode(hp).right) then
                                     inc(offset,len*(get_ordinal_value(tvecnode(hp).right)-base))
                                   else
                                     Message(cg_e_illegal_expression);
                                 end;
                               subscriptn :
                                 inc(offset,tsubscriptnode(hp).vs.address)
                               else
                                 Message(cg_e_illegal_expression);
                             end;
                             hp:=tbinarynode(hp).left;
                          end;
                        srsym:=tloadnode(hp).symtableentry;
                        case srsym.typ of
                          procsym :
                            begin
                              if assigned(tprocsym(srsym).defs^.next) then
                                Message(parser_e_no_overloaded_procvars);
                              curconstSegment.concat(Tai_const_symbol.Createname_offset(tprocsym(srsym).defs^.def.mangledname,offset));
                            end;
                          varsym :
                            curconstSegment.concat(Tai_const_symbol.Createname_offset(tvarsym(srsym).mangledname,offset));
                          typedconstsym :
                            curconstSegment.concat(Tai_const_symbol.Createname_offset(ttypedconstsym(srsym).mangledname,offset));
                          else
                            Message(type_e_variable_id_expected);
                        end;
                      end
                    else
                      Message(cg_e_illegal_expression);
                  end
              else
              { allow typeof(Object type)}
                if (p.nodetype=inlinen) and
                   (tinlinenode(p).inlinenumber=in_typeof_x) then
                  begin
                    if (tinlinenode(p).left.nodetype=typen) then
                      begin
                        curconstSegment.concat(Tai_const_symbol.createname(
                          tobjectdef(tinlinenode(p).left.resulttype.def).vmt_mangledname));
                      end
                    else
                      Message(cg_e_illegal_expression);
                  end
              else
                Message(cg_e_illegal_expression);
              p.free;
           end;
         setdef:
           begin
              p:=comp_expr(true);
              if p.nodetype=setconstn then
                begin
                   { be sure to convert to the correct result, else
                     it can generate smallset data instead of normalset (PFV) }
                   inserttypeconv(p,t);
                   { we only allow const sets }
                   if assigned(tsetconstnode(p).left) then
                     Message(cg_e_illegal_expression)
                   else
                     begin
                        { this writing is endian independant   }
                        { untrue - because they are considered }
                        { arrays of 32-bit values CEC          }

                        if source_info.endian = target_info.endian then
                          begin
                            for l:= 0 to p.resulttype.def.size-1 do
                               curconstsegment.concat(tai_const.create_8bit(tsetconstnode(p).value_set^[l]));
                          end
                        else
                          begin
                            { store as longint values in swaped format }
                            j:=0;
                            for l:=0 to ((p.resulttype.def.size-1) div 4) do
                              begin
                                curconstsegment.concat(tai_const.create_8bit(tsetconstnode(p).value_set^[j+3]));
                                curconstsegment.concat(tai_const.create_8bit(tsetconstnode(p).value_set^[j+2]));
                                curconstsegment.concat(tai_const.create_8bit(tsetconstnode(p).value_set^[j+1]));
                                curconstsegment.concat(tai_const.create_8bit(tsetconstnode(p).value_set^[j]));
                                Inc(j,4);
                              end;
                          end;
                     end;
                end
              else
                Message(cg_e_illegal_expression);
              p.free;
           end;
         enumdef:
           begin
              p:=comp_expr(true);
              if p.nodetype=ordconstn then
                begin
                  if is_equal(p.resulttype.def,t.def) or
                     is_subequal(p.resulttype.def,t.def) then
                   begin
                     case p.resulttype.def.size of
                       1 : curconstSegment.concat(Tai_const.Create_8bit(tordconstnode(p).value));
                       2 : curconstSegment.concat(Tai_const.Create_16bit(tordconstnode(p).value));
                       4 : curconstSegment.concat(Tai_const.Create_32bit(tordconstnode(p).value));
                     end;
                   end
                  else
                   Message2(type_e_incompatible_types,t.def.typename,p.resulttype.def.typename);
                end
              else
                Message(cg_e_illegal_expression);
              p.free;
           end;
         stringdef:
           begin
              p:=comp_expr(true);
              { load strval and strlength of the constant tree }
              if p.nodetype=stringconstn then
                begin
                  { convert to the expected string type so that
                    for widestrings strval is a pcompilerwidestring }
                  inserttypeconv(p,t);
                  strlength:=tstringconstnode(p).len;
                  strval:=tstringconstnode(p).value_str;
                end
              else if is_constcharnode(p) then
                begin
                  { strval:=pchar(@tordconstnode(p).value);
                    THIS FAIL on BIG_ENDIAN MACHINES PM }
                  c:=chr(tordconstnode(p).value and $ff);
                  strval:=@c;
                  strlength:=1
                end
              else if is_constresourcestringnode(p) then
                begin
                  strval:=pchar(tconstsym(tloadnode(p).symtableentry).valueptr);
                  strlength:=tconstsym(tloadnode(p).symtableentry).len;
                end
              else
                begin
                  Message(cg_e_illegal_expression);
                  strlength:=-1;
                end;
              if strlength>=0 then
               begin
                 case tstringdef(t.def).string_typ of
                   st_shortstring:
                     begin
                       if strlength>=t.def.size then
                        begin
                          message2(parser_w_string_too_long,strpas(strval),tostr(t.def.size-1));
                          strlength:=t.def.size-1;
                        end;
                       curconstSegment.concat(Tai_const.Create_8bit(strlength));
                       { this can also handle longer strings }
                       getmem(ca,strlength+1);
                       move(strval^,ca^,strlength);
                       ca[strlength]:=#0;
                       curconstSegment.concat(Tai_string.Create_length_pchar(ca,strlength));
                       { fillup with spaces if size is shorter }
                       if t.def.size>strlength then
                        begin
                          getmem(ca,t.def.size-strlength);
                          { def.size contains also the leading length, so we }
                          { we have to subtract one                       }
                          fillchar(ca[0],t.def.size-strlength-1,' ');
                          ca[t.def.size-strlength-1]:=#0;
                          { this can also handle longer strings }
                          curconstSegment.concat(Tai_string.Create_length_pchar(ca,t.def.size-strlength-1));
                        end;
                     end;
                   st_ansistring:
                     begin
                        { an empty ansi string is nil! }
                        if (strlength=0) then
                          curconstSegment.concat(Tai_const.Create_32bit(0))
                        else
                          begin
                            getdatalabel(ll);
                            curconstSegment.concat(Tai_const_symbol.Create(ll));
                            { first write the maximum size }
                            Consts.concat(Tai_const.Create_32bit(strlength));
                            { second write the real length }
                            Consts.concat(Tai_const.Create_32bit(strlength));
                            { redondent with maxlength but who knows ... (PM) }
                            { third write use count (set to -1 for safety ) }
                            Consts.concat(Tai_const.Create_32bit(-1));
                            Consts.concat(Tai_label.Create(ll));
                            getmem(ca,strlength+2);
                            move(strval^,ca^,strlength);
                            { The terminating #0 to be stored in the .data section (JM) }
                            ca[strlength]:=#0;
                            { End of the PChar. The memory has to be allocated because in }
                            { tai_string.done, there is a freemem(len+1) (JM)             }
                            ca[strlength+1]:=#0;
                            Consts.concat(Tai_string.Create_length_pchar(ca,strlength+1));
                          end;
                     end;
                   st_widestring:
                     begin
                        { an empty ansi string is nil! }
                        if (strlength=0) then
                          curconstSegment.concat(Tai_const.Create_32bit(0))
                        else
                          begin
                            getdatalabel(ll);
                            curconstSegment.concat(Tai_const_symbol.Create(ll));
                            Consts.concat(Tai_const.Create_32bit(strlength));
                            Consts.concat(Tai_const.Create_32bit(strlength));
                            Consts.concat(Tai_const.Create_32bit(-1));
                            Consts.concat(Tai_label.Create(ll));
                            for i:=0 to strlength-1 do
                              Consts.concat(Tai_const.Create_16bit(pcompilerwidestring(strval)^.data[i]));
                            { ending #0 }
                            Consts.concat(Tai_const.Create_16bit(0))
                          end;
                     end;
                   st_longstring:
                     begin
                       internalerror(200107081);
                       {curconstSegment.concat(Tai_const.Create_32bit(strlength))));
                       curconstSegment.concat(Tai_const.Create_8bit(0));
                       getmem(ca,strlength+1);
                       move(strval^,ca^,strlength);
                       ca[strlength]:=#0;
                       generate_pascii(consts,ca,strlength);
                       curconstSegment.concat(Tai_const.Create_8bit(0));}
                     end;
                 end;
               end;
              p.free;
           end;
         arraydef:
           begin
              if token=_LKLAMMER then
                begin
                    consume(_LKLAMMER);
                    for l:=tarraydef(t.def).lowrange to tarraydef(t.def).highrange-1 do
                      begin
                         readtypedconst(tarraydef(t.def).elementtype,nil,writable);
                         consume(_COMMA);
                      end;
                    readtypedconst(tarraydef(t.def).elementtype,nil,writable);
                    consume(_RKLAMMER);
                 end
              else
              { if array of char then we allow also a string }
               if is_char(tarraydef(t.def).elementtype.def) then
                begin
                   p:=comp_expr(true);
                   if p.nodetype=stringconstn then
                    begin
                      len:=tstringconstnode(p).len;
                      { For tp7 the maximum lentgh can be 255 }
                      if (m_tp in aktmodeswitches) and
                         (len>255) then
                       len:=255;
                      ca:=tstringconstnode(p).value_str;
                    end
                   else
                     if is_constcharnode(p) then
                      begin
                        c:=chr(tordconstnode(p).value and $ff);
                        ca:=@c;
                        len:=1;
                      end
                   else
                     begin
                       Message(cg_e_illegal_expression);
                       len:=0;
                     end;
                   if len>(tarraydef(t.def).highrange-tarraydef(t.def).lowrange+1) then
                     Message(parser_e_string_larger_array);
                   for i:=tarraydef(t.def).lowrange to tarraydef(t.def).highrange do
                     begin
                        if i+1-tarraydef(t.def).lowrange<=len then
                          begin
                             curconstSegment.concat(Tai_const.Create_8bit(byte(ca^)));
                             inc(ca);
                          end
                        else
                          {Fill the remaining positions with #0.}
                          curconstSegment.concat(Tai_const.Create_8bit(0));
                     end;
                   p.free;
                end
              else
                begin
                  { we want the ( }
                  consume(_LKLAMMER);
                end;
           end;
         procvardef:
           begin
              { Procvars and pointers are no longer compatible.  }
              { under tp:  =nil or =var under fpc: =nil or =@var }
              if token=_NIL then
                begin
                   curconstSegment.concat(Tai_const.Create_32bit(0));
                   if (po_methodpointer in tprocvardef(t.def).procoptions) then
                     curconstSegment.concat(Tai_const.Create_32bit(0));
                   consume(_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 tprocvardef(t.def).procoptions) then
                Message(parser_e_no_procvarobj_const);
                { parse the rest too, so we can continue with error checking }
              getprocvar:=true;
              getprocvardef:=tprocvardef(t.def);
              p:=comp_expr(true);
              getprocvar:=false;
              if codegenerror then
               begin
                 p.free;
                 exit;
               end;
              { let type conversion check everything needed }
              inserttypeconv(p,t);
              if codegenerror then
               begin
                 p.free;
                 exit;
               end;
              { remove typeconvn, that will normally insert a lea
                instruction which is not necessary for us }
              if p.nodetype=typeconvn then
               begin
                 hp:=ttypeconvnode(p).left;
                 ttypeconvnode(p).left:=nil;
                 p.free;
                 p:=hp;
               end;
              { remove addrn which we also don't need here }
              if p.nodetype=addrn then
               begin
                 hp:=taddrnode(p).left;
                 taddrnode(p).left:=nil;
                 p.free;
                 p:=hp;
               end;
              { we now need to have a loadn with a procsym }
              if (p.nodetype=loadn) and
                 (tloadnode(p).symtableentry.typ=procsym) then
               begin
                 curconstSegment.concat(Tai_const_symbol.createname(
                   tprocsym(tloadnode(p).symtableentry).defs^.def.mangledname));
               end
              else
               Message(cg_e_illegal_expression);
              p.free;
           end;
         { reads a typed constant record }
         recorddef:
           begin
              { KAZ }
              if (trecorddef(t.def)=rec_tguid) and
                 ((token=_CSTRING) or (token=_CCHAR) or (token=_ID)) then
                begin
                  p:=comp_expr(true);
                  inserttypeconv(p,cshortstringtype);
                  if p.nodetype=stringconstn then
                    begin
                      s:=strpas(tstringconstnode(p).value_str);
                      p.free;
                      if string2guid(s,tmpguid) then
                        begin
                          curconstSegment.concat(Tai_const.Create_32bit(tmpguid.D1));
                          curconstSegment.concat(Tai_const.Create_16bit(tmpguid.D2));
                          curconstSegment.concat(Tai_const.Create_16bit(tmpguid.D3));
                          for i:=Low(tmpguid.D4) to High(tmpguid.D4) do
                            curconstSegment.concat(Tai_const.Create_8bit(tmpguid.D4[i]));
                        end
                      else
                        Message(parser_e_improper_guid_syntax);
                    end
                  else
                    begin
                      p.free;
                      Message(cg_e_illegal_expression);
                      exit;
                    end;
                end
              else
                begin
                   consume(_LKLAMMER);
                   aktpos:=0;
                   srsym := tsym(trecorddef(t.def).symtable.symindex.first);
                   recsym := nil;
                   while token<>_RKLAMMER do
                     begin
                        s:=pattern;
                        sorg:=orgpattern;
                        consume(_ID);
                        consume(_COLON);
                        error := false;
                        recsym := tsym(trecorddef(t.def).symtable.search(s));
                        if not assigned(recsym) then
                          begin
                            Message1(sym_e_illegal_field,s);
                            error := true;
                          end;
                        if 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
                               (tvarsym(recsym).address = tvarsym(srsym).address)) 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);                  }
                               (tvarsym(recsym).address = aktpos) then
                              srsym := recsym
                            { going backwards isn't allowed in any mode }
                            else if (tvarsym(recsym).address<aktpos) then
                              begin
                                Message(parser_e_invalid_record_const);
                                error := true;
                              end
                            { Delphi allows you to skip fields }
                            else if (m_delphi in aktmodeswitches) 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 tvarsym(srsym).address>aktpos then
                               for i:=1 to tvarsym(srsym).address-aktpos do
                                 curconstSegment.concat(Tai_const.Create_8bit(0));

                             { new position }
                             aktpos:=tvarsym(srsym).address+tvarsym(srsym).vartype.def.size;

                             { read the data }
                             readtypedconst(tvarsym(srsym).vartype,nil,writable);

                             { keep previous field for checking whether whole }
                             { record was initialized (JM)                    }
                             recsym := srsym;
                             { goto next field }
                             srsym := tsym(srsym.indexnext);

                             if token=_SEMICOLON then
                               consume(_SEMICOLON)
                             else break;
                          end;
                   end;

                 { are there any fields left?                            }
                 if assigned(srsym) and
                    { don't complain if there only come other variant parts }
                    { after the last initialized field                      }
                    ((recsym=nil) or
                     (tvarsym(srsym).address > tvarsym(recsym).address)) then
                   Message1(parser_h_skipped_fields_after,s);

                 for i:=1 to t.def.size-aktpos do
                   curconstSegment.concat(Tai_const.Create_8bit(0));

                 consume(_RKLAMMER);
              end;
           end;
         { reads a typed object }
         objectdef:
           begin
              if is_class_or_interface(t.def) then
                begin
                  p:=comp_expr(true);
                  if p.nodetype<>niln then
                    begin
                      Message(parser_e_type_const_not_possible);
                      consume_all_until(_RKLAMMER);
                    end
                  else
                    begin
                      curconstSegment.concat(Tai_const.Create_32bit(0));
                    end;
                  p.free;
                end
              { for objects we allow it only if it doesn't contain a vmt }
              else if (oo_has_vmt in tobjectdef(t.def).objectoptions) and
                      not(m_tp in aktmodeswitches) then
                 Message(parser_e_type_const_not_possible)
              else
                begin
                   consume(_LKLAMMER);
                   aktpos:=0;
                   while token<>_RKLAMMER do
                     begin
                        s:=pattern;
                        sorg:=orgpattern;
                        consume(_ID);
                        consume(_COLON);
                        srsym:=nil;
                        obj:=tobjectdef(t.def);
                        symt:=obj.symtable;
                        while (srsym=nil) and assigned(symt) do
                          begin
                             srsym:=tsym(symt.search(s));
                             if assigned(obj) then
                               obj:=obj.childof;
                             if assigned(obj) then
                               symt:=obj.symtable
                             else
                               symt:=nil;
                          end;

                        if srsym=nil then
                          begin
                             Message1(sym_e_id_not_found,sorg);
                             consume_all_until(_SEMICOLON);
                          end
                        else
                          begin
                             { check position }
                             if tvarsym(srsym).address<aktpos then
                               Message(parser_e_invalid_record_const);

                             { check in VMT needs to be added for TP mode }
                             if (m_tp in aktmodeswitches) and
                                (oo_has_vmt in tobjectdef(t.def).objectoptions) and
                                (tobjectdef(t.def).vmt_offset<tvarsym(srsym).address) then
                               begin
                                 for i:=1 to tobjectdef(t.def).vmt_offset-aktpos do
                                   curconstsegment.concat(tai_const.create_8bit(0));
                                 curconstsegment.concat(tai_const_symbol.createname(tobjectdef(t.def).vmt_mangledname));
                                 { this is more general }
                                 aktpos:=tobjectdef(t.def).vmt_offset + target_info.size_of_pointer;
                               end;

                             { if needed fill }
                             if tvarsym(srsym).address>aktpos then
                               for i:=1 to tvarsym(srsym).address-aktpos do
                                 curconstSegment.concat(Tai_const.Create_8bit(0));

                             { new position }
                             aktpos:=tvarsym(srsym).address+tvarsym(srsym).vartype.def.size;

                             { read the data }
                             readtypedconst(tvarsym(srsym).vartype,nil,writable);

                             if token=_SEMICOLON then
                               consume(_SEMICOLON)
                             else break;
                          end;
                     end;
                   if (m_tp in aktmodeswitches) and
                      (oo_has_vmt in tobjectdef(t.def).objectoptions) and
                      (tobjectdef(t.def).vmt_offset>=aktpos) then
                     begin
                       for i:=1 to tobjectdef(t.def).vmt_offset-aktpos do
                         curconstsegment.concat(tai_const.create_8bit(0));
                       curconstsegment.concat(tai_const_symbol.createname(tobjectdef(t.def).vmt_mangledname));
                       { this is more general }
                       aktpos:=tobjectdef(t.def).vmt_offset + target_info.size_of_pointer;
                     end;
                   for i:=1 to t.def.size-aktpos do
                     curconstSegment.concat(Tai_const.Create_8bit(0));
                   consume(_RKLAMMER);
                end;
           end;
         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;
      end;
{$ifdef fpc}
  {$maxfpuregisters default}
{$endif fpc}

end.
{
  $Log$
  Revision 1.39  2001-12-06 17:57:38  florian
    + parasym to tparaitem added

  Revision 1.38  2001/11/02 22:58:06  peter
    * procsym definition rewrite

  Revision 1.37  2001/10/29 14:59:48  jonas
    * typed constants that are "procedure of object" and which are assigned
      nil require 8 bytes of "0" (not 4)
    * fixed web bug 1655 (reject the code)

  Revision 1.36  2001/10/20 20:30:21  peter
    * read only typed const support, switch $J-

  Revision 1.35  2001/10/20 17:24:26  peter
    * make all sets equal when reading an array of sets. Before it could
      mix normal and small sets in the same array!

  Revision 1.34  2001/09/19 11:06:03  michael
  * realname updated for some hints
  * realname used for consts,labels

  Revision 1.33  2001/09/17 21:29:12  peter
    * merged netbsd, fpu-overflow from fixes branch

  Revision 1.32  2001/09/02 21:18:28  peter
    * split constsym.value in valueord,valueordptr,valueptr. The valueordptr
      is used for holding target platform pointer values. As those can be
      bigger than the source platform.

  Revision 1.31  2001/08/26 13:36:47  florian
    * some cg reorganisation
    * some PPC updates

  Revision 1.30  2001/08/01 21:46:41  peter
    * support pwidechar in typed const

  Revision 1.29  2001/07/30 21:39:26  peter
    * declare fpu in rtl for m68k linux

  Revision 1.28  2001/07/30 20:59:27  peter
    * m68k updates from v10 merged

  Revision 1.27  2001/07/08 21:00:15  peter
    * various widestring updates, it works now mostly without charset
      mapping supported

  Revision 1.26  2001/06/29 14:16:57  jonas
    * fixed inconsistent handling of procvars in FPC mode (sometimes @ was
      required to assign the address of a procedure to a procvar, sometimes
      not. Now it is always required) (merged)

  Revision 1.25  2001/06/27 21:37:36  peter
    * v10 merges

  Revision 1.24  2001/06/18 20:36:25  peter
    * -Ur switch (merged)
    * masm fixes (merged)
    * quoted filenames for go32v2 and win32

  Revision 1.23  2001/05/06 17:15:00  jonas
    + detect incomplete typed constant records

  Revision 1.22  2001/04/18 22:01:57  peter
    * registration of targets and assemblers

  Revision 1.21  2001/04/13 01:22:13  peter
    * symtable change to classes
    * range check generation and errors fixed, make cycle DEBUG=1 works
    * memory leaks fixed

  Revision 1.20  2001/04/04 22:43:53  peter
    * remove unnecessary calls to firstpass

  Revision 1.19  2001/04/02 21:20:34  peter
    * resulttype rewrite

  Revision 1.18  2001/03/11 22:58:50  peter
    * getsym redesign, removed the globals srsym,srsymtable

  Revision 1.17  2001/02/04 11:12:16  jonas
    * fixed web bug 1377 & const pointer arithmtic

  Revision 1.16  2001/02/03 00:26:35  peter
    * merged fix for bug 1365

  Revision 1.15  2000/12/25 00:07:28  peter
    + new tlinkedlist class (merge of old tstringqueue,tcontainer and
      tlinkedlist objects)

  Revision 1.14  2000/12/10 20:24:18  peter
    * allow subtypes for enums

  Revision 1.13  2000/11/29 00:30:38  florian
    * unused units removed from uses clause
    * some changes for widestrings

  Revision 1.12  2000/11/06 15:54:15  florian
    * fixed two bugs to get make cycle work, but it's not enough

  Revision 1.11  2000/11/04 14:25:21  florian
    + merged Attila's changes for interfaces, not tested yet

  Revision 1.10  2000/10/31 22:02:51  peter
    * symtable splitted, no real code changes

  Revision 1.9  2000/10/14 10:14:52  peter
    * moehrendorf oct 2000 rewrite

  Revision 1.8  2000/09/30 13:23:04  peter
    * const array of char and pchar length fixed (merged)

  Revision 1.7  2000/09/24 15:06:25  peter
    * use defines.inc

  Revision 1.6  2000/08/27 16:11:52  peter
    * moved some util functions from globals,cobjects to cutils
    * splitted files into finput,fmodule

  Revision 1.5  2000/08/24 19:13:18  peter
    * allow nil for class typed consts (merged)

  Revision 1.4  2000/08/16 13:06:06  florian
    + support of 64 bit integer constants

  Revision 1.3  2000/08/05 13:25:06  peter
    * packenum 1 fixes (merged)

  Revision 1.2  2000/07/13 11:32:47  michael
  + removed logs

}