fpc/compiler/pexpr.pas

{
    Copyright (c) 1998-2002 by Florian Klaempfl

    Does parsing of expression for Free Pascal

    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 pexpr;

{$i fpcdefs.inc}

interface

    uses
      symtype,symdef,symbase,
      node,ncal,
      tokens,globtype,globals,constexp;

    { reads a whole expression }
    function expr(dotypecheck:boolean) : tnode;

    { reads an expression without assignements and .. }
    function comp_expr(accept_equal,typeonly:boolean):tnode;

    { reads a single factor }
    function factor(getaddr,typeonly:boolean) : tnode;

    procedure string_dec(var def: tdef; allowtypedef: boolean);

    function parse_paras(__colon,__namedpara : boolean;end_of_paras : ttoken) : tnode;

    { the ID token has to be consumed before calling this function }
    procedure do_member_read(structh:tabstractrecorddef;getaddr:boolean;sym:tsym;var p1:tnode;var again:boolean;callflags:tcallnodeflags);

    function get_intconst:TConstExprInt;
    function get_stringconst:string;

    { Does some postprocessing for a generic type (especially when nested types
      of the specialization are used) }
    procedure post_comp_expr_gendef(var def: tdef);

implementation

    uses
       { common }
       cutils,
       { global }
       verbose,
       systems,widestr,
       { symtable }
       symconst,symtable,symsym,defutil,defcmp,
       { module }
       fmodule,ppu,
       { pass 1 }
       pass_1,htypechk,
       nmat,nadd,nmem,nset,ncnv,ninl,ncon,nld,nflw,nbas,nutils,
       { parser }
       scanner,
       pbase,pinline,ptype,pgenutil,
       { codegen }
       cgbase,procinfo,cpuinfo
       ;

    { sub_expr(opmultiply) is need to get -1 ** 4 to be
      read as - (1**4) and not (-1)**4 PM }
    type
      Toperator_precedence=(opcompare,opaddition,opmultiply,oppower);

    const
      highest_precedence = oppower;

    function sub_expr(pred_level:Toperator_precedence;accept_equal,typeonly:boolean;factornode:tnode):tnode;forward;

    const
       { true, if the inherited call is anonymous }
       anon_inherited : boolean = false;
       { last def found, only used by anon. inherited calls to insert proper type casts }
       srdef : tdef = nil;

    procedure string_dec(var def:tdef; allowtypedef: boolean);
    { reads a string type with optional length }
    { and returns a pointer to the string      }
    { definition                               }
      var
         p : tnode;
      begin
         def:=cshortstringtype;
         consume(_STRING);
         if token=_LECKKLAMMER then
           begin
             if not(allowtypedef) then
               Message(parser_e_no_local_para_def);
             consume(_LECKKLAMMER);
             p:=comp_expr(true,false);
             if not is_constintnode(p) then
               begin
                 Message(parser_e_illegal_expression);
                 { error recovery }
                 consume(_RECKKLAMMER);
               end
             else
               begin
                if (tordconstnode(p).value<=0) then
                  begin
                     Message(parser_e_invalid_string_size);
                     tordconstnode(p).value:=255;
                  end;
                if tordconstnode(p).value>255 then
                  begin
                    { longstring is currently unsupported (CEC)! }
{                    t:=tstringdef.createlong(tordconstnode(p).value))}
                    Message(parser_e_invalid_string_size);
                    tordconstnode(p).value:=255;
                    def:=tstringdef.createshort(int64(tordconstnode(p).value));
                  end
                else
                  if tordconstnode(p).value<>255 then
                    def:=tstringdef.createshort(int64(tordconstnode(p).value));
                consume(_RECKKLAMMER);
              end;
             p.free;
           end
         else
           begin
             if cs_ansistrings in current_settings.localswitches then
               def:=getansistringdef
             else
               def:=cshortstringtype;
           end;
       end;


    function parse_paras(__colon,__namedpara : boolean;end_of_paras : ttoken) : tnode;
      var
         p1,p2,argname : tnode;
         prev_in_args,
         old_named_args_allowed,
         old_allow_array_constructor : boolean;
      begin
         if token=end_of_paras then
           begin
              parse_paras:=nil;
              exit;
           end;
         { save old values }
         prev_in_args:=in_args;
         old_allow_array_constructor:=allow_array_constructor;
         old_named_args_allowed:=named_args_allowed;
         { set para parsing values }
         in_args:=true;
         named_args_allowed:=false;
         allow_array_constructor:=true;
         p2:=nil;
         repeat
           if __namedpara then
             begin
               if token=_COMMA then
                 begin
                   { empty parameter }
                   p2:=ccallparanode.create(cnothingnode.create,p2);
                 end
               else
                 begin
                   named_args_allowed:=true;
                   p1:=comp_expr(true,false);
                   named_args_allowed:=false;
                   if found_arg_name then
                     begin
                       argname:=p1;
                       p1:=comp_expr(true,false);
                       p2:=ccallparanode.create(p1,p2);
                       tcallparanode(p2).parametername:=argname;
                     end
                   else
                     p2:=ccallparanode.create(p1,p2);
                   found_arg_name:=false;
                 end;
             end
           else
             begin
               p1:=comp_expr(true,false);
               p2:=ccallparanode.create(p1,p2);
             end;
           { it's for the str(l:5,s); }
           if __colon and (token=_COLON) then
             begin
               consume(_COLON);
               p1:=comp_expr(true,false);
               p2:=ccallparanode.create(p1,p2);
               include(tcallparanode(p2).callparaflags,cpf_is_colon_para);
               if try_to_consume(_COLON) then
                 begin
                   p1:=comp_expr(true,false);
                   p2:=ccallparanode.create(p1,p2);
                   include(tcallparanode(p2).callparaflags,cpf_is_colon_para);
                 end
             end;
         until not try_to_consume(_COMMA);
         allow_array_constructor:=old_allow_array_constructor;
         in_args:=prev_in_args;
         named_args_allowed:=old_named_args_allowed;
         parse_paras:=p2;
      end;


     function gen_c_style_operator(ntyp:tnodetype;p1,p2:tnode) : tnode;
       var
         hp    : tnode;
         hdef  : tdef;
         temp  : ttempcreatenode;
         newstatement : tstatementnode;
       begin
         { Properties are not allowed, because the write can
           be different from the read }
         if (nf_isproperty in p1.flags) then
           begin
             Message(type_e_variable_id_expected);
             { We can continue with the loading,
               it'll not create errors. Only the expected
               result can be wrong }
           end;

         hp:=p1;
         while assigned(hp) and
               (hp.nodetype in [derefn,subscriptn,vecn,typeconvn]) do
           hp:=tunarynode(hp).left;
         if not assigned(hp) then
           internalerror(200410121);
         if (hp.nodetype=calln) then
           begin
             typecheckpass(p1);
             result:=internalstatements(newstatement);
             hdef:=tpointerdef.create(p1.resultdef);
             temp:=ctempcreatenode.create(hdef,sizeof(pint),tt_persistent,false);
             addstatement(newstatement,temp);
             addstatement(newstatement,cassignmentnode.create(ctemprefnode.create(temp),caddrnode.create_internal(p1)));
             addstatement(newstatement,cassignmentnode.create(
                 cderefnode.create(ctemprefnode.create(temp)),
                 caddnode.create(ntyp,
                     cderefnode.create(ctemprefnode.create(temp)),
                     p2)));
             addstatement(newstatement,ctempdeletenode.create(temp));
           end
         else
           result:=cassignmentnode.create(p1,caddnode.create(ntyp,p1.getcopy,p2));
       end;


     function statement_syssym(l : byte) : tnode;
      var
        p1,p2,paras  : tnode;
        err,
        prev_in_args : boolean;
      begin
        prev_in_args:=in_args;
        case l of

          in_new_x :
            begin
              if afterassignment or in_args then
               statement_syssym:=new_function
              else
               statement_syssym:=new_dispose_statement(true);
            end;

          in_dispose_x :
            begin
              statement_syssym:=new_dispose_statement(false);
            end;

          in_ord_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              consume(_RKLAMMER);
              p1:=geninlinenode(in_ord_x,false,p1);
              statement_syssym := p1;
            end;

          in_exit :
            begin
              if try_to_consume(_LKLAMMER) then
                begin
                  if not (m_mac in current_settings.modeswitches) then
                    begin
                      if not(try_to_consume(_RKLAMMER)) then
                        begin
                          p1:=comp_expr(true,false);
                          consume(_RKLAMMER);
                          if (not assigned(current_procinfo) or
                              is_void(current_procinfo.procdef.returndef)) then
                            begin
                              Message(parser_e_void_function);
                              { recovery }
                              p1.free;
                              p1:=nil;
                            end;
                        end
                      else
                        p1:=nil;
                    end
                  else
                    begin
                      if not (current_procinfo.procdef.procsym.name = pattern) then
                        Message(parser_e_macpas_exit_wrong_param);
                      consume(_ID);
                      consume(_RKLAMMER);
                      p1:=nil;
                    end
                end
              else
                p1:=nil;
              statement_syssym:=cexitnode.create(p1);
            end;

          in_break :
            begin
              statement_syssym:=cbreaknode.create
            end;

          in_continue :
            begin
              statement_syssym:=ccontinuenode.create
            end;

          in_leave :
            begin
              if m_mac in current_settings.modeswitches then
                statement_syssym:=cbreaknode.create
              else
                begin
                  Message1(sym_e_id_not_found, orgpattern);
                  statement_syssym:=cerrornode.create;
                end;
            end;

          in_cycle :
            begin
              if m_mac in current_settings.modeswitches then
                statement_syssym:=ccontinuenode.create
              else
                begin
                  Message1(sym_e_id_not_found, orgpattern);
                  statement_syssym:=cerrornode.create;
                end;
            end;

          in_typeof_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              consume(_RKLAMMER);
              if p1.nodetype=typen then
                ttypenode(p1).allowed:=true;
              { Allow classrefdef, which is required for
                Typeof(self) in static class methods }
              if not(is_objc_class_or_protocol(p1.resultdef)) and
                 ((p1.resultdef.typ = objectdef) or
                  (assigned(current_procinfo) and
                   ((po_classmethod in current_procinfo.procdef.procoptions) or
                    (po_staticmethod in current_procinfo.procdef.procoptions)) and
                   (p1.resultdef.typ=classrefdef))) then
               statement_syssym:=geninlinenode(in_typeof_x,false,p1)
              else
               begin
                 Message(parser_e_class_id_expected);
                 p1.destroy;
                 statement_syssym:=cerrornode.create;
               end;
            end;

          in_sizeof_x,
          in_bitsizeof_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              consume(_RKLAMMER);
              if ((p1.nodetype<>typen) and

                 (
                  (is_object(p1.resultdef) and
                   (oo_has_constructor in tobjectdef(p1.resultdef).objectoptions)) or
                  is_open_array(p1.resultdef) or
                  is_array_of_const(p1.resultdef) or
                  is_open_string(p1.resultdef)
                 )) or
                 { keep the function call if it is a type parameter to avoid arithmetic errors due to constant folding }
                 (p1.resultdef.typ=undefineddef) then
                begin
                  statement_syssym:=geninlinenode(in_sizeof_x,false,p1);
                  { no packed bit support for these things }
                  if (l = in_bitsizeof_x) then
                    statement_syssym:=caddnode.create(muln,statement_syssym,cordconstnode.create(8,sinttype,true));
                end
              else
               begin
                 { allow helpers for SizeOf and BitSizeOf }
                 if p1.nodetype=typen then
                   ttypenode(p1).helperallowed:=true;
                 if (p1.resultdef.typ=forwarddef) then
                   Message1(type_e_type_is_not_completly_defined,tforwarddef(p1.resultdef).tosymname^);
                 if (l = in_sizeof_x) or
                    (not((p1.nodetype = vecn) and
                         is_packed_array(tvecnode(p1).left.resultdef)) and
                     not((p1.nodetype = subscriptn) and
                         is_packed_record_or_object(tsubscriptnode(p1).left.resultdef))) then
                   begin
                     statement_syssym:=cordconstnode.create(p1.resultdef.size,sinttype,true);
                     if (l = in_bitsizeof_x) then
                       statement_syssym:=caddnode.create(muln,statement_syssym,cordconstnode.create(8,sinttype,true));
                   end
                 else
                   statement_syssym:=cordconstnode.create(p1.resultdef.packedbitsize,sinttype,true);
                 { p1 not needed !}
                 p1.destroy;
               end;
            end;

          in_typeinfo_x,
          in_objc_encode_x :
            begin
              if (l=in_typeinfo_x) or
                 (m_objectivec1 in current_settings.modeswitches) then
                begin
                  consume(_LKLAMMER);
                  in_args:=true;
                  p1:=comp_expr(true,false);
                  { When reading a class type it is parsed as loadvmtaddrn,
                    typeinfo only needs the type so we remove the loadvmtaddrn }
                  if p1.nodetype=loadvmtaddrn then
                    begin
                      p2:=tloadvmtaddrnode(p1).left;
                      tloadvmtaddrnode(p1).left:=nil;
                      p1.free;
                      p1:=p2;
                    end;
                  if p1.nodetype=typen then
                  begin
                    ttypenode(p1).allowed:=true;
                    { allow helpers for TypeInfo }
                    if l=in_typeinfo_x then
                      ttypenode(p1).helperallowed:=true;
                  end;
    {              else
                    begin
                       p1.destroy;
                       p1:=cerrornode.create;
                       Message(parser_e_illegal_parameter_list);
                    end;}
                  consume(_RKLAMMER);
                  p2:=geninlinenode(l,false,p1);
                  statement_syssym:=p2;
                end
              else
                begin
                  Message1(sym_e_id_not_found, orgpattern);
                  statement_syssym:=cerrornode.create;
                end;
            end;

          in_unaligned_x :
            begin
              err:=false;
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              p2:=ccallparanode.create(p1,nil);
              p2:=geninlinenode(in_unaligned_x,false,p2);
              consume(_RKLAMMER);
              statement_syssym:=p2;
            end;

          in_assigned_x :
            begin
              err:=false;
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              { When reading a class type it is parsed as loadvmtaddrn,
                typeinfo only needs the type so we remove the loadvmtaddrn }
              if p1.nodetype=loadvmtaddrn then
                begin
                  p2:=tloadvmtaddrnode(p1).left;
                  tloadvmtaddrnode(p1).left:=nil;
                  p1.free;
                  p1:=p2;
                end;
              if not codegenerror then
               begin
                 case p1.resultdef.typ of
                   procdef, { procvar }
                   pointerdef,
                   procvardef,
                   classrefdef : ;
                   objectdef :
                     if not is_implicit_pointer_object_type(p1.resultdef) then
                       begin
                         Message(parser_e_illegal_parameter_list);
                         err:=true;
                       end;
                   arraydef :
                     if not is_dynamic_array(p1.resultdef) then
                       begin
                         Message(parser_e_illegal_parameter_list);
                         err:=true;
                       end;
                   else
                     if p1.resultdef.typ<>undefineddef then
                       begin
                         Message(parser_e_illegal_parameter_list);
                         err:=true;
                       end;
                 end;
               end
              else
               err:=true;
              if not err then
               begin
                 p2:=ccallparanode.create(p1,nil);
                 p2:=geninlinenode(in_assigned_x,false,p2);
               end
              else
               begin
                 p1.free;
                 p2:=cerrornode.create;
               end;
              consume(_RKLAMMER);
              statement_syssym:=p2;
            end;

          in_addr_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              p1:=caddrnode.create(p1);
              consume(_RKLAMMER);
              statement_syssym:=p1;
            end;

          in_ofs_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              p1:=caddrnode.create(p1);
              do_typecheckpass(p1);
              { Ofs() returns a cardinal/qword, not a pointer }
              p1.resultdef:=uinttype;
              consume(_RKLAMMER);
              statement_syssym:=p1;
            end;

          in_seg_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              p1:=geninlinenode(in_seg_x,false,p1);
              consume(_RKLAMMER);
              statement_syssym:=p1;
            end;

          in_high_x,
          in_low_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              p2:=geninlinenode(l,false,p1);
              consume(_RKLAMMER);
              statement_syssym:=p2;
            end;

          in_succ_x,
          in_pred_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              p2:=geninlinenode(l,false,p1);
              consume(_RKLAMMER);
              statement_syssym:=p2;
            end;

          in_inc_x,
          in_dec_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              if try_to_consume(_COMMA) then
                p2:=ccallparanode.create(comp_expr(true,false),nil)
              else
                p2:=nil;
              p2:=ccallparanode.create(p1,p2);
              statement_syssym:=geninlinenode(l,false,p2);
              consume(_RKLAMMER);
            end;

          in_slice_x:
            begin
              if not(in_args) then
                begin
                  message(parser_e_illegal_slice);
                  consume(_LKLAMMER);
                  in_args:=true;
                  comp_expr(true,false).free;
                  if try_to_consume(_COMMA) then
                    comp_expr(true,false).free;
                  statement_syssym:=cerrornode.create;
                  consume(_RKLAMMER);
                end
              else
                begin
                  consume(_LKLAMMER);
                  in_args:=true;
                  p1:=comp_expr(true,false);
                  Consume(_COMMA);
                  if not(codegenerror) then
                    p2:=ccallparanode.create(comp_expr(true,false),nil)
                  else
                    p2:=cerrornode.create;
                  p2:=ccallparanode.create(p1,p2);
                  statement_syssym:=geninlinenode(l,false,p2);
                  consume(_RKLAMMER);
                end;
            end;

          in_initialize_x:
            begin
              statement_syssym:=inline_initialize;
            end;

          in_finalize_x:
            begin
              statement_syssym:=inline_finalize;
            end;

          in_copy_x:
            begin
              statement_syssym:=inline_copy;
            end;

          in_concat_x :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              { Translate to x:=x+y[+z]. The addnode will do the
                type checking }
              p2:=nil;
              repeat
                p1:=comp_expr(true,false);
                if p2<>nil then
                  p2:=caddnode.create(addn,p2,p1)
                else
                  begin
                    { Force string type if it isn't yet }
                    if not(
                           (p1.resultdef.typ=stringdef) or
                           is_chararray(p1.resultdef) or
                           is_char(p1.resultdef)
                          ) then
                      inserttypeconv(p1,cshortstringtype);
                    p2:=p1;
                  end;
              until not try_to_consume(_COMMA);
              consume(_RKLAMMER);
              statement_syssym:=p2;
            end;

          in_read_x,
          in_readln_x,
          in_readstr_x:
            begin
              if try_to_consume(_LKLAMMER) then
               begin
                 paras:=parse_paras(false,false,_RKLAMMER);
                 consume(_RKLAMMER);
               end
              else
               paras:=nil;
              p1:=geninlinenode(l,false,paras);
              statement_syssym := p1;
            end;

          in_setlength_x:
            begin
              statement_syssym := inline_setlength;
            end;

          in_objc_selector_x:
            begin
              if (m_objectivec1 in current_settings.modeswitches) then
                begin
                  consume(_LKLAMMER);
                  in_args:=true;
                  { don't turn procsyms into calls (getaddr = true) }
                  p1:=factor(true,false);
                  p2:=geninlinenode(l,false,p1);
                  consume(_RKLAMMER);
                  statement_syssym:=p2;
                end
              else
                begin
                  Message1(sym_e_id_not_found, orgpattern);
                  statement_syssym:=cerrornode.create;
                end;
            end;
          in_length_x:
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              p2:=geninlinenode(l,false,p1);
              consume(_RKLAMMER);
              statement_syssym:=p2;
            end;

          in_write_x,
          in_writeln_x,
          in_writestr_x :
            begin
              if try_to_consume(_LKLAMMER) then
               begin
                 paras:=parse_paras(true,false,_RKLAMMER);
                 consume(_RKLAMMER);
               end
              else
               paras:=nil;
              p1 := geninlinenode(l,false,paras);
              statement_syssym := p1;
            end;

          in_str_x_string :
            begin
              consume(_LKLAMMER);
              paras:=parse_paras(true,false,_RKLAMMER);
              consume(_RKLAMMER);
              p1 := geninlinenode(l,false,paras);
              statement_syssym := p1;
            end;

          in_val_x:
            Begin
              consume(_LKLAMMER);
              in_args := true;
              p1:= ccallparanode.create(comp_expr(true,false), nil);
              consume(_COMMA);
              p2 := ccallparanode.create(comp_expr(true,false),p1);
              if try_to_consume(_COMMA) then
                p2 := ccallparanode.create(comp_expr(true,false),p2);
              consume(_RKLAMMER);
              p2 := geninlinenode(l,false,p2);
              statement_syssym := p2;
            End;

          in_include_x_y,
          in_exclude_x_y :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              consume(_COMMA);
              p2:=comp_expr(true,false);
              statement_syssym:=geninlinenode(l,false,ccallparanode.create(p1,ccallparanode.create(p2,nil)));
              consume(_RKLAMMER);
            end;

          in_pack_x_y_z,
          in_unpack_x_y_z :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              consume(_COMMA);
              p2:=comp_expr(true,false);
              consume(_COMMA);
              paras:=comp_expr(true,false);
              statement_syssym:=geninlinenode(l,false,ccallparanode.create(p1,ccallparanode.create(p2,ccallparanode.create(paras,nil))));
              consume(_RKLAMMER);
            end;

          in_assert_x_y :
            begin
              consume(_LKLAMMER);
              in_args:=true;
              p1:=comp_expr(true,false);
              if try_to_consume(_COMMA) then
                 p2:=comp_expr(true,false)
              else
               begin
                 { then insert an empty string }
                 p2:=cstringconstnode.createstr('');
               end;
              statement_syssym:=geninlinenode(l,false,ccallparanode.create(p1,ccallparanode.create(p2,nil)));
              consume(_RKLAMMER);
            end;
          in_get_frame:
            begin
              statement_syssym:=geninlinenode(l,false,nil);
            end;
(*
          in_get_caller_frame:
            begin
              if try_to_consume(_LKLAMMER) then
                begin
                  {You used to call get_caller_frame as get_caller_frame(get_frame),
                   however, as a stack frame may not exist, it does more harm than
                   good, so ignore it.}
                  in_args:=true;
                  p1:=comp_expr(true,false);
                  p1.destroy;
                  consume(_RKLAMMER);
                end;
              statement_syssym:=geninlinenode(l,false,nil);
            end;
*)
          else
            internalerror(15);

        end;
        in_args:=prev_in_args;
      end;


    function maybe_load_methodpointer(st:TSymtable;var p1:tnode):boolean;
      begin
        maybe_load_methodpointer:=false;
        if not assigned(p1) then
         begin
           case st.symtabletype of
             withsymtable :
               begin
                 if (st.defowner.typ=objectdef) then
                   p1:=tnode(twithsymtable(st).withrefnode).getcopy;
               end;
             ObjectSymtable,
             recordsymtable:
               begin
                 { We are calling from the static class method which has no self node }
                 if assigned(current_procinfo) and current_procinfo.procdef.no_self_node then
                   p1:=cloadvmtaddrnode.create(ctypenode.create(current_procinfo.procdef.struct))
                 else
                   p1:=load_self_node;
                 { We are calling a member }
                 maybe_load_methodpointer:=true;
               end;
           end;
         end;
      end;


    { reads the parameter for a subroutine call }
    procedure do_proc_call(sym:tsym;st:TSymtable;obj:tabstractrecorddef;getaddr:boolean;var again : boolean;var p1:tnode;callflags:tcallnodeflags);
      var
         membercall,
         prevafterassn : boolean;
         i        : integer;
         para,p2  : tnode;
         currpara : tparavarsym;
         aprocdef : tprocdef;
      begin
         prevafterassn:=afterassignment;
         afterassignment:=false;
         membercall:=false;
         aprocdef:=nil;

         { when it is a call to a member we need to load the
           methodpointer first
         }
         membercall:=maybe_load_methodpointer(st,p1);

         { When we are expecting a procvar we also need
           to get the address in some cases }
         if assigned(getprocvardef) then
          begin
            if (block_type=bt_const) or
               getaddr then
             begin
               aprocdef:=Tprocsym(sym).Find_procdef_byprocvardef(getprocvardef);
               getaddr:=true;
             end
            else
             if ((m_tp_procvar in current_settings.modeswitches) or
                 (m_mac_procvar in current_settings.modeswitches)) and
                not(token in [_CARET,_POINT,_LKLAMMER]) then
              begin
                aprocdef:=Tprocsym(sym).Find_procdef_byprocvardef(getprocvardef);
                if assigned(aprocdef) then
                 getaddr:=true;
              end;
          end;

         { only need to get the address of the procedure? }
         if getaddr then
           begin
             { Retrieve info which procvar to call. For tp_procvar the
               aprocdef is already loaded above so we can reuse it }
             if not assigned(aprocdef) and
                assigned(getprocvardef) then
               aprocdef:=Tprocsym(sym).Find_procdef_byprocvardef(getprocvardef);

             { generate a methodcallnode or proccallnode }
             { we shouldn't convert things like @tcollection.load }
             p2:=cloadnode.create_procvar(sym,aprocdef,st);
             if assigned(p1) then
              begin
                { for loading methodpointer of an inherited function
                  we use self as instance and load the address of
                  the function directly and not through the vmt (PFV) }
                if (cnf_inherited in callflags) then
                  begin
                    include(tloadnode(p2).loadnodeflags,loadnf_inherited);
                    p1.free;
                    p1:=load_self_node;
                  end;
                if (p1.nodetype<>typen) then
                  tloadnode(p2).set_mp(p1)
                else
                  p1.free;
              end;
             p1:=p2;

             { no postfix operators }
             again:=false;
           end
         else
           begin
             para:=nil;
             if anon_inherited then
              begin
                if not assigned(current_procinfo) then
                  internalerror(200305054);
                for i:=0 to current_procinfo.procdef.paras.count-1 do
                  begin
                    currpara:=tparavarsym(current_procinfo.procdef.paras[i]);
                    if not(vo_is_hidden_para in currpara.varoptions) then
                      begin
                        { inheritance by msgint? }
                        if assigned(srdef) then
                          { anonymous inherited via msgid calls only require a var parameter for
                            both methods, so we need some type casting here }
                          para:=ccallparanode.create(ctypeconvnode.create_internal(ctypeconvnode.create_internal(
                            cloadnode.create(currpara,currpara.owner),cformaltype),tparavarsym(tprocdef(srdef).paras[i]).vardef),
                          para)
                        else
                          para:=ccallparanode.create(cloadnode.create(currpara,currpara.owner),para);
                      end;
                 end;
              end
             else
              begin
                if try_to_consume(_LKLAMMER) then
                 begin
                   para:=parse_paras(false,false,_RKLAMMER);
                   consume(_RKLAMMER);
                 end;
              end;
             { indicate if this call was generated by a member and
               no explicit self is used, this is needed to determine
               how to handle a destructor call (PFV) }
             if membercall then
               include(callflags,cnf_member_call);
             if assigned(obj) then
               begin
                 if not (st.symtabletype in [ObjectSymtable,recordsymtable]) then
                   internalerror(200310031);
                 p1:=ccallnode.create(para,tprocsym(sym),obj.symtable,p1,callflags);
               end
             else
               p1:=ccallnode.create(para,tprocsym(sym),st,p1,callflags);
           end;
         afterassignment:=prevafterassn;
      end;


    procedure handle_procvar(pv : tprocvardef;var p2 : tnode);
      var
        hp,hp2 : tnode;
        hpp    : ^tnode;
        currprocdef : tprocdef;
      begin
        if not assigned(pv) then
         internalerror(200301121);
        if (m_tp_procvar in current_settings.modeswitches) or
           (m_mac_procvar in current_settings.modeswitches) then
         begin
           hp:=p2;
           hpp:=@p2;
           while assigned(hp) and
                 (hp.nodetype=typeconvn) do
            begin
              hp:=ttypeconvnode(hp).left;
              { save orignal address of the old tree so we can replace the node }
              hpp:=@hp;
            end;
           if (hp.nodetype=calln) and
              { a procvar can't have parameters! }
              not assigned(tcallnode(hp).left) then
            begin
              currprocdef:=tcallnode(hp).symtableprocentry.Find_procdef_byprocvardef(pv);
              if assigned(currprocdef) then
               begin
                 hp2:=cloadnode.create_procvar(tprocsym(tcallnode(hp).symtableprocentry),currprocdef,tcallnode(hp).symtableproc);
                 if (po_methodpointer in pv.procoptions) then
                   tloadnode(hp2).set_mp(tcallnode(hp).methodpointer.getcopy);
                 hp.destroy;
                 { replace the old callnode with the new loadnode }
                 hpp^:=hp2;
               end;
            end;
         end;
      end;


    { checks whether sym is a static field and if so, translates the access
      to the appropriate node tree }
    function handle_staticfield_access(sym: tsym; nested: boolean; var p1: tnode): boolean;
      var
        static_name: shortstring;
        srsymtable: tsymtable;
      begin
        result:=false;
        { generate access code }
        if (sp_static in sym.symoptions) then
          begin
            result:=true;
            if not nested then
              static_name:=lower(sym.owner.name^)+'_'+sym.name
            else
             static_name:=lower(generate_nested_name(sym.owner,'_'))+'_'+sym.name;
            if sym.owner.defowner.typ=objectdef then
              searchsym_in_class(tobjectdef(sym.owner.defowner),tobjectdef(sym.owner.defowner),static_name,sym,srsymtable,true)
            else
              searchsym_in_record(trecorddef(sym.owner.defowner),static_name,sym,srsymtable);
            if assigned(sym) then
              check_hints(sym,sym.symoptions,sym.deprecatedmsg);
            p1.free;
            p1:=nil;
            { static syms are always stored as absolutevarsym to handle scope and storage properly }
            propaccesslist_to_node(p1,nil,tabsolutevarsym(sym).ref);
          end;
      end;


    { the following procedure handles the access to a property symbol }
    procedure handle_propertysym(propsym : tpropertysym;st : TSymtable;var p1 : tnode);
      var
         paras : tnode;
         p2    : tnode;
         membercall : boolean;
         callflags  : tcallnodeflags;
         propaccesslist : tpropaccesslist;
         sym: tsym;
      begin
         { property parameters? read them only if the property really }
         { has parameters                                             }
         paras:=nil;
         if (ppo_hasparameters in propsym.propoptions) then
           begin
             if try_to_consume(_LECKKLAMMER) then
               begin
                 paras:=parse_paras(false,false,_RECKKLAMMER);
                 consume(_RECKKLAMMER);
               end;
           end;
         { indexed property }
         if (ppo_indexed in propsym.propoptions) then
           begin
             p2:=cordconstnode.create(propsym.index,propsym.indexdef,true);
             paras:=ccallparanode.create(p2,paras);
           end;
         { we need only a write property if a := follows }
         { if not(afterassignment) and not(in_args) then }
         if token=_ASSIGNMENT then
           begin
              if getpropaccesslist(propsym,palt_write,propaccesslist) then
                begin
                   sym:=propaccesslist.firstsym^.sym;
                   case sym.typ of
                     procsym :
                       begin
                         callflags:=[];
                         { generate the method call }
                         membercall:=maybe_load_methodpointer(st,p1);
                         if membercall then
                           include(callflags,cnf_member_call);
                         p1:=ccallnode.create(paras,tprocsym(sym),st,p1,callflags);
                         addsymref(sym);
                         paras:=nil;
                         consume(_ASSIGNMENT);
                         { read the expression }
                         if propsym.propdef.typ=procvardef then
                           getprocvardef:=tprocvardef(propsym.propdef);
                         p2:=comp_expr(true,false);
                         if assigned(getprocvardef) then
                           handle_procvar(getprocvardef,p2);
                         tcallnode(p1).left:=ccallparanode.create(p2,tcallnode(p1).left);
                         { mark as property, both the tcallnode and the real call block }
                         include(p1.flags,nf_isproperty);
                         getprocvardef:=nil;
                       end;
                     fieldvarsym :
                       begin
                         { generate access code }
                         if not handle_staticfield_access(sym,false,p1) then
                           propaccesslist_to_node(p1,st,propaccesslist);
                         include(p1.flags,nf_isproperty);
                         consume(_ASSIGNMENT);
                         { read the expression }
                         p2:=comp_expr(true,false);
                         p1:=cassignmentnode.create(p1,p2);
                      end
                    else
                      begin
                        p1:=cerrornode.create;
                        Message(parser_e_no_procedure_to_access_property);
                      end;
                  end;
                end
              else
                begin
                   p1:=cerrornode.create;
                   Message(parser_e_no_procedure_to_access_property);
                end;
           end
         else
           begin
              if getpropaccesslist(propsym,palt_read,propaccesslist) then
                begin
                   sym := propaccesslist.firstsym^.sym;
                   case sym.typ of
                     fieldvarsym :
                       begin
                         { generate access code }
                         if not handle_staticfield_access(sym,false,p1) then
                           propaccesslist_to_node(p1,st,propaccesslist);
                         include(p1.flags,nf_isproperty);
                         { catch expressions like "(propx):=1;" }
                         include(p1.flags,nf_no_lvalue);
                       end;
                     procsym :
                       begin
                          callflags:=[];
                          { generate the method call }
                          membercall:=maybe_load_methodpointer(st,p1);
                          if membercall then
                            include(callflags,cnf_member_call);
                          p1:=ccallnode.create(paras,tprocsym(sym),st,p1,callflags);
                          paras:=nil;
                          include(p1.flags,nf_isproperty);
                          include(p1.flags,nf_no_lvalue);
                       end
                     else
                       begin
                          p1:=cerrornode.create;
                          Message(type_e_mismatch);
                       end;
                  end;
                end
              else
                begin
                   { error, no function to read property }
                   p1:=cerrornode.create;
                   Message(parser_e_no_procedure_to_access_property);
                end;
           end;
        { release paras if not used }
        if assigned(paras) then
         paras.free;
      end;


    { the ID token has to be consumed before calling this function }
    procedure do_member_read(structh:tabstractrecorddef;getaddr:boolean;sym:tsym;var p1:tnode;var again:boolean;callflags:tcallnodeflags);
      var
        isclassref:boolean;
      begin
         if sym=nil then
           begin
              { pattern is still valid unless
              there is another ID just after the ID of sym }
              Message1(sym_e_id_no_member,orgpattern);
              p1.free;
              p1:=cerrornode.create;
              { try to clean up }
              again:=false;
           end
         else
           begin
              if assigned(p1) then
               begin
                 if not assigned(p1.resultdef) then
                   do_typecheckpass(p1);
                 isclassref:=(p1.resultdef.typ=classrefdef);
               end
              else
                isclassref:=false;

              { we assume, that only procsyms and varsyms are in an object }
              { symbol table, for classes, properties are allowed          }
              case sym.typ of
                 procsym:
                   begin
                      do_proc_call(sym,sym.owner,structh,
                                   (getaddr and not(token in [_CARET,_POINT])),
                                   again,p1,callflags);
                      { we need to know which procedure is called }
                      do_typecheckpass(p1);
                      { calling using classref? }
                      if isclassref and
                         (p1.nodetype=calln) and
                         assigned(tcallnode(p1).procdefinition) and
                         not(po_classmethod in tcallnode(p1).procdefinition.procoptions) and
                         not(tcallnode(p1).procdefinition.proctypeoption=potype_constructor) then
                        Message(parser_e_only_class_members_via_class_ref);
                   end;
                 fieldvarsym:
                   begin
                      if not handle_staticfield_access(sym,true,p1) then
                        begin
                          if isclassref then
                            if assigned(p1) and
                              (
                                is_self_node(p1) or
                                (assigned(current_procinfo) and (current_procinfo.procdef.no_self_node) and
                                (current_procinfo.procdef.struct=structh))) then
                              Message(parser_e_only_class_members)
                            else
                              Message(parser_e_only_class_members_via_class_ref);
                          p1:=csubscriptnode.create(sym,p1);
                        end;
                   end;
                 propertysym:
                   begin
                      if isclassref and not (sp_static in sym.symoptions) then
                        Message(parser_e_only_class_members_via_class_ref);
                      handle_propertysym(tpropertysym(sym),sym.owner,p1);
                   end;
                 typesym:
                   begin
                     p1.free;
                     if try_to_consume(_LKLAMMER) then
                      begin
                        p1:=comp_expr(true,false);
                        consume(_RKLAMMER);
                        p1:=ctypeconvnode.create_explicit(p1,ttypesym(sym).typedef);
                      end
                     else
                       begin
                         p1:=ctypenode.create(ttypesym(sym).typedef);
                         if (is_class(ttypesym(sym).typedef) or is_objcclass(ttypesym(sym).typedef)) and
                            not(block_type in [bt_type,bt_const_type,bt_var_type]) then
                           p1:=cloadvmtaddrnode.create(p1);
                       end;
                   end;
                 constsym:
                   begin
                     p1.free;
                     p1:=genconstsymtree(tconstsym(sym));
                   end;
                 staticvarsym:
                   begin
                     { typed constant is a staticvarsym
                       now they are absolutevarsym }
                     p1.free;
                     p1:=cloadnode.create(sym,sym.Owner);
                   end;
                 absolutevarsym:
                   begin
                     p1.free;
                     p1:=nil;
                     { typed constants are absolutebarsyms now to handle storage properly }
                     propaccesslist_to_node(p1,nil,tabsolutevarsym(sym).ref);
                   end
                 else
                   internalerror(16);
              end;
           end;
      end;

    function handle_factor_typenode(hdef:tdef;getaddr:boolean;var again:boolean;sym:tsym;typeonly:boolean):tnode;
      var
        srsym : tsym;
        srsymtable : tsymtable;
      begin
         if sym=nil then
           sym:=hdef.typesym;
         { allow Ordinal(Value) for type declarations since it
           can be an enummeration declaration or a set lke:
           (OrdinalType(const1)..OrdinalType(const2) }
         if (not typeonly or is_ordinal(hdef))and try_to_consume(_LKLAMMER) then
          begin
            result:=comp_expr(true,false);
            consume(_RKLAMMER);
            { type casts to class helpers aren't allowed }
            if is_objectpascal_helper(hdef) then
              Message(parser_e_no_category_as_types)
              { recovery by not creating a conversion node }
            else
              result:=ctypeconvnode.create_explicit(result,hdef);
          end
         else { not LKLAMMER }
          if (token=_POINT) and
             (is_object(hdef) or is_record(hdef)) then
           begin
             consume(_POINT);
             { handles calling methods declared in parent objects
               using "parentobject.methodname()" }
             if assigned(current_structdef) and
                not(getaddr) and
                current_structdef.is_related(hdef) then
               begin
                 result:=ctypenode.create(hdef);
                 ttypenode(result).typesym:=sym;
                 { search also in inherited methods }
                 searchsym_in_class(tobjectdef(hdef),tobjectdef(current_structdef),pattern,srsym,srsymtable,true);
                 if assigned(srsym) then
                   check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
                 consume(_ID);
                 do_member_read(tabstractrecorddef(hdef),false,srsym,result,again,[]);
               end
             else
              begin
                { handles:
                    * @TObject.Load
                    * static methods and variables }
                result:=ctypenode.create(hdef);
                ttypenode(result).typesym:=sym;
                { TP allows also @TMenu.Load if Load is only }
                { defined in an anchestor class              }
                srsym:=search_struct_member(tabstractrecorddef(hdef),pattern);
                if assigned(srsym) then
                  begin
                    check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
                        consume(_ID);
                        do_member_read(tabstractrecorddef(hdef),getaddr,srsym,result,again,[]);
                  end
                else
                  Message1(sym_e_id_no_member,orgpattern);
              end;
           end
         else
          begin
            { Normally here would be the check against the usage
              of "TClassHelper.Something", but as that might be
              used inside of system symbols like sizeof and
              typeinfo this check is put into ttypenode.pass_1
              (for "TClassHelper" alone) and tcallnode.pass_1
              (for "TClassHelper.Something") }
            { class reference ? }
            if is_class(hdef) or
               is_objcclass(hdef) then
             begin
               if getaddr and (token=_POINT) then
                begin
                  consume(_POINT);
                  { allows @Object.Method }
                  { also allows static methods and variables }
                  result:=ctypenode.create(hdef);
                  ttypenode(result).typesym:=sym;
                  { TP allows also @TMenu.Load if Load is only }
                  { defined in an anchestor class              }
                  srsym:=search_struct_member(tobjectdef(hdef),pattern);
                  if assigned(srsym) then
                   begin
                     check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
                     consume(_ID);
                     do_member_read(tabstractrecorddef(hdef),getaddr,srsym,result,again,[]);
                   end
                  else
                   begin
                     Message1(sym_e_id_no_member,orgpattern);
                     consume(_ID);
                   end;
                end
               else
                begin
                  result:=ctypenode.create(hdef);
                  ttypenode(result).typesym:=sym;
                  { For a type block we simply return only
                    the type. For all other blocks we return
                    a loadvmt node }
                  if not(block_type in [bt_type,bt_const_type,bt_var_type]) then
                    result:=cloadvmtaddrnode.create(result);
                end;
             end
            else
              begin
                result:=ctypenode.create(hdef);
                ttypenode(result).typesym:=sym;
              end;
          end;
      end;

{****************************************************************************
                               Factor
****************************************************************************}


{---------------------------------------------
               PostFixOperators
---------------------------------------------}

    { returns whether or not p1 has been changed }
    function postfixoperators(var p1:tnode;var again:boolean;getaddr:boolean): boolean;

      { tries to avoid syntax errors after invalid qualifiers }
      procedure recoverconsume_postfixops;
       begin
         repeat
           if not try_to_consume(_CARET) then
             if try_to_consume(_POINT) then
               try_to_consume(_ID)
             else if try_to_consume(_LECKKLAMMER) then
               begin
                 repeat
                   comp_expr(true,false);
                 until not try_to_consume(_COMMA);
                 consume(_RECKKLAMMER);
               end
             else if try_to_consume(_LKLAMMER) then
               begin
                 repeat
                   comp_expr(true,false);
                 until not try_to_consume(_COMMA);
                 consume(_RKLAMMER);
               end
             else
               break;
         until false;
       end;


      procedure handle_variantarray;
       var
         p4 : tnode;
         newstatement : tstatementnode;
         tempresultvariant,
         temp    : ttempcreatenode;
         paras : tcallparanode;
         newblock : tnode;
         countindices : aint;
       begin
         { create statements with call initialize the arguments and
           call fpc_dynarr_setlength }
         newblock:=internalstatements(newstatement);

         { get temp for array of indicies,
           we set the real size later }
         temp:=ctempcreatenode.create(s32inttype,4,tt_persistent,false);
         addstatement(newstatement,temp);

         countindices:=0;
         repeat
           p4:=comp_expr(true,false);

           addstatement(newstatement,cassignmentnode.create(
             ctemprefnode.create_offset(temp,countindices*s32inttype.size),p4));
            inc(countindices);
         until not try_to_consume(_COMMA);

         { set real size }
         temp.size:=countindices*s32inttype.size;

         consume(_RECKKLAMMER);

         { we need only a write access if a := follows }
         if token=_ASSIGNMENT then
           begin
             consume(_ASSIGNMENT);
             p4:=comp_expr(true,false);

             { create call to fpc_vararray_put }
             paras:=ccallparanode.create(cordconstnode.create
                   (countindices,s32inttype,true),
                ccallparanode.create(caddrnode.create_internal
               (ctemprefnode.create(temp)),
                ccallparanode.create(ctypeconvnode.create_internal(p4,cvarianttype),
                ccallparanode.create(ctypeconvnode.create_internal(p1,cvarianttype)
                  ,nil))));

             addstatement(newstatement,ccallnode.createintern('fpc_vararray_put',paras));
             addstatement(newstatement,ctempdeletenode.create(temp));
           end
         else
           begin
             { create temp for result }
             tempresultvariant:=ctempcreatenode.create(cvarianttype,cvarianttype.size,tt_persistent,true);
             addstatement(newstatement,tempresultvariant);

             { create call to fpc_vararray_get }
             paras:=ccallparanode.create(cordconstnode.create
                   (countindices,s32inttype,true),
                ccallparanode.create(caddrnode.create_internal
               (ctemprefnode.create(temp)),
                ccallparanode.create(p1,
                ccallparanode.create(
                    ctemprefnode.create(tempresultvariant)
                  ,nil))));

             addstatement(newstatement,ccallnode.createintern('fpc_vararray_get',paras));
             addstatement(newstatement,ctempdeletenode.create(temp));
             { the last statement should return the value as
               location and type, this is done be referencing the
               temp and converting it first from a persistent temp to
               normal temp }
             addstatement(newstatement,ctempdeletenode.create_normal_temp(tempresultvariant));
             addstatement(newstatement,ctemprefnode.create(tempresultvariant));
           end;
         p1:=newblock;
       end;

      function parse_array_constructor(arrdef:tarraydef): tnode;
        var
          newstatement,assstatement:tstatementnode;
          arrnode:ttempcreatenode;
          temp2:ttempcreatenode;
          assnode:tnode;
          paracount:integer;
        begin
          result:=internalstatements(newstatement);
          { create temp for result }
          arrnode:=ctempcreatenode.create(arrdef,arrdef.size,tt_persistent,true);
          addstatement(newstatement,arrnode);

          paracount:=0;
          { check arguments and create an assignment calls }
          if try_to_consume(_LKLAMMER) then
            begin
              assnode:=internalstatements(assstatement);
              repeat
                { arr[i] := param_i }
                addstatement(assstatement,
                  cassignmentnode.create(
                    cvecnode.create(
                      ctemprefnode.create(arrnode),
                      cordconstnode.create(paracount,arrdef.rangedef,false)),
                    comp_expr(true,false)));
                inc(paracount);
              until not try_to_consume(_COMMA);
              consume(_RKLAMMER);
            end
          else
            assnode:=nil;

          { get temp for array of lengths }
          temp2:=ctempcreatenode.create(sinttype,sinttype.size,tt_persistent,false);
          addstatement(newstatement,temp2);

          { one dimensional }
          addstatement(newstatement,cassignmentnode.create(
              ctemprefnode.create_offset(temp2,0),
              cordconstnode.create
                 (paracount,s32inttype,true)));
          { create call to fpc_dynarr_setlength }
          addstatement(newstatement,ccallnode.createintern('fpc_dynarray_setlength',
              ccallparanode.create(caddrnode.create_internal
                    (ctemprefnode.create(temp2)),
                 ccallparanode.create(cordconstnode.create
                    (1,s32inttype,true),
                 ccallparanode.create(caddrnode.create_internal
                    (crttinode.create(tstoreddef(arrdef),initrtti,rdt_normal)),
                 ccallparanode.create(
                   ctypeconvnode.create_internal(
                     ctemprefnode.create(arrnode),voidpointertype),
                   nil))))

            ));
          { add assignment statememnts }
          addstatement(newstatement,ctempdeletenode.create(temp2));
          if assigned(assnode) then
            addstatement(newstatement,assnode);
          { the last statement should return the value as
            location and type, this is done be referencing the
            temp and converting it first from a persistent temp to
            normal temp }
          addstatement(newstatement,ctempdeletenode.create_normal_temp(arrnode));
          addstatement(newstatement,ctemprefnode.create(arrnode));
        end;

    var
     protsym  : tpropertysym;
     p2,p3  : tnode;
     srsym  : tsym;
     srsymtable : TSymtable;
     structh    : tabstractrecorddef;
     { shouldn't be used that often, so the extra overhead is ok to save
       stack space }
     dispatchstring : ansistring;
     nodechanged    : boolean;
     calltype: tdispcalltype;
    label
     skipreckklammercheck;
    begin
     result:=false;
     again:=true;
     while again do
      begin
        { we need the resultdef }
        do_typecheckpass_changed(p1,nodechanged);
        result:=result or nodechanged;

        if codegenerror then
         begin
           recoverconsume_postfixops;
           exit;
         end;
        { handle token }
        case token of
          _CARET:
             begin
               consume(_CARET);

               { support tp/mac procvar^ if the procvar returns a
                 pointer type }
               if ((m_tp_procvar in current_settings.modeswitches) or
                   (m_mac_procvar in current_settings.modeswitches)) and
                  (p1.resultdef.typ=procvardef) and
                  (tprocvardef(p1.resultdef).returndef.typ=pointerdef) then
                 begin
                   p1:=ccallnode.create_procvar(nil,p1);
                   typecheckpass(p1);
                 end;

               if (p1.resultdef.typ<>pointerdef) then
                 begin
                    { ^ as binary operator is a problem!!!! (FK) }
                    again:=false;
                    Message(parser_e_invalid_qualifier);
                    recoverconsume_postfixops;
                    p1.destroy;
                    p1:=cerrornode.create;
                 end
               else
                 p1:=cderefnode.create(p1);
             end;

          _LECKKLAMMER:
             begin
               if is_class_or_interface_or_object(p1.resultdef) or
                 is_dispinterface(p1.resultdef) or is_record(p1.resultdef) then
                 begin
                   { default property }
                   protsym:=search_default_property(tabstractrecorddef(p1.resultdef));
                   if not(assigned(protsym)) then
                     begin
                        p1.destroy;
                        p1:=cerrornode.create;
                        again:=false;
                        message(parser_e_no_default_property_available);
                     end
                   else
                     begin
                       { The property symbol is referenced indirect }
                       protsym.IncRefCount;
                       handle_propertysym(protsym,protsym.owner,p1);
                     end;
                 end
               else
                 begin
                   consume(_LECKKLAMMER);
                   repeat
                     { in all of the cases below, p1 is changed }
                     case p1.resultdef.typ of
                       pointerdef:
                         begin
                            { support delphi autoderef }
                            if (tpointerdef(p1.resultdef).pointeddef.typ=arraydef) and
                               (m_autoderef in current_settings.modeswitches) then
                              p1:=cderefnode.create(p1);
                            p2:=comp_expr(true,false);
                            { Support Pbytevar[0..9] which returns array [0..9].}
                            if try_to_consume(_POINTPOINT) then
                              p2:=crangenode.create(p2,comp_expr(true,false));
                            p1:=cvecnode.create(p1,p2);
                         end;
                       variantdef:
                         begin
                           handle_variantarray;
                           { the RECKKLAMMER is already read }
                           goto skipreckklammercheck;
                         end;
                       stringdef :
                         begin
                           p2:=comp_expr(true,false);
                           { Support string[0..9] which returns array [0..9] of char.}
                           if try_to_consume(_POINTPOINT) then
                             p2:=crangenode.create(p2,comp_expr(true,false));
                           p1:=cvecnode.create(p1,p2);
                         end;
                       arraydef:
                         begin
                           p2:=comp_expr(true,false);
                           { support SEG:OFS for go32v2 Mem[] }
                           if (target_info.system in [system_i386_go32v2,system_i386_watcom]) and
                              (p1.nodetype=loadn) and
                              assigned(tloadnode(p1).symtableentry) and
                              assigned(tloadnode(p1).symtableentry.owner.name) and
                              (tloadnode(p1).symtableentry.owner.name^='SYSTEM') and
                              ((tloadnode(p1).symtableentry.name='MEM') or
                               (tloadnode(p1).symtableentry.name='MEMW') or
                               (tloadnode(p1).symtableentry.name='MEML')) then
                             begin
                               if try_to_consume(_COLON) then
                                begin
                                  p3:=caddnode.create(muln,cordconstnode.create($10,s32inttype,false),p2);
                                  p2:=comp_expr(true,false);
                                  p2:=caddnode.create(addn,p2,p3);
                                  if try_to_consume(_POINTPOINT) then
                                    { Support mem[$a000:$0000..$07ff] which returns array [0..$7ff] of memtype.}
                                    p2:=crangenode.create(p2,caddnode.create(addn,comp_expr(true,false),p3.getcopy));
                                  p1:=cvecnode.create(p1,p2);
                                  include(tvecnode(p1).flags,nf_memseg);
                                  include(tvecnode(p1).flags,nf_memindex);
                                end
                               else
                                begin
                                  if try_to_consume(_POINTPOINT) then
                                    { Support mem[$80000000..$80000002] which returns array [0..2] of memtype.}
                                    p2:=crangenode.create(p2,comp_expr(true,false));
                                  p1:=cvecnode.create(p1,p2);
                                  include(tvecnode(p1).flags,nf_memindex);
                                end;
                             end
                           else
                             begin
                               if try_to_consume(_POINTPOINT) then
                                 { Support arrayvar[0..9] which returns array [0..9] of arraytype.}
                                 p2:=crangenode.create(p2,comp_expr(true,false));
                               p1:=cvecnode.create(p1,p2);
                             end;
                         end;
                       else
                         begin
                           if p1.resultdef.typ<>undefineddef then
                             Message(parser_e_invalid_qualifier);
                           p1.destroy;
                           p1:=cerrornode.create;
                           comp_expr(true,false);
                           again:=false;
                         end;
                     end;
                     do_typecheckpass(p1);
                   until not try_to_consume(_COMMA);
                   consume(_RECKKLAMMER);
                   { handle_variantarray eats the RECKKLAMMER and jumps here }
                 skipreckklammercheck:
                 end;
             end;

          _POINT :
             begin
               consume(_POINT);
               if (p1.resultdef.typ=pointerdef) and
                  (m_autoderef in current_settings.modeswitches) and
                  { don't auto-deref objc.id, because then the code
                    below for supporting id.anyobjcmethod isn't triggered }
                  (p1.resultdef<>objc_idtype) then
                 begin
                   p1:=cderefnode.create(p1);
                   do_typecheckpass(p1);
                 end;
               { procvar.<something> can never mean anything so always
                 try to call it in case it returns a record/object/... }
               maybe_call_procvar(p1,false);

               case p1.resultdef.typ of
                 recorddef:
                   begin
                     if token=_ID then
                       begin
                         structh:=tabstractrecorddef(p1.resultdef);
                         searchsym_in_record(structh,pattern,srsym,srsymtable);
                         if assigned(srsym) then
                           begin
                             check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
                             consume(_ID);
                             do_member_read(structh,getaddr,srsym,p1,again,[]);
                           end
                         else
                           begin
                             Message1(sym_e_id_no_member,orgpattern);
                             p1.destroy;
                             p1:=cerrornode.create;
                             { try to clean up }
                             consume(_ID);
                           end;
                       end
                     else
                     consume(_ID);
                   end;
                 enumdef:
                   begin
                     if token=_ID then
                       begin
                         srsym:=tsym(tenumdef(p1.resultdef).symtable.Find(pattern));
                         p1.destroy;
                         if assigned(srsym) and (srsym.typ=enumsym) then
                           begin
                             check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
                             p1:=genenumnode(tenumsym(srsym));
                           end
                         else
                           begin
                             Message1(sym_e_id_no_member,orgpattern);
                             p1:=cerrornode.create;
                           end;
                       end;
                     consume(_ID);
                   end;
                 arraydef:
                   begin
                     if is_dynamic_array(p1.resultdef) then
                       begin
                         if token=_ID then
                           begin
                             if pattern='CREATE' then
                               begin
                                 consume(_ID);
                                 p2:=parse_array_constructor(tarraydef(p1.resultdef));
                                 p1.destroy;
                                 p1:=p2;
                               end
                             else
                               begin
                                 Message2(scan_f_syn_expected,'CREATE',pattern);
                                 p1.destroy;
                                 p1:=cerrornode.create;
                                 consume(_ID);
                               end;
                           end;
                       end
                     else
                       begin
                         Message(parser_e_invalid_qualifier);
                         p1.destroy;
                         p1:=cerrornode.create;
                         consume(_ID);
                       end;
                   end;
                  variantdef:
                    begin
                      { dispatch call? }
                      { lhs := v.ident[parameters] -> property get
                        lhs := v.ident(parameters) -> method call
                        v.ident[parameters] := rhs -> property put
                        v.ident(parameters) := rhs -> also property put }
                      if token=_ID then
                        begin
                          dispatchstring:=orgpattern;
                          consume(_ID);
                          calltype:=dct_method;
                          if try_to_consume(_LKLAMMER) then
                            begin
                              p2:=parse_paras(false,true,_RKLAMMER);
                              consume(_RKLAMMER);
                            end
                          else if try_to_consume(_LECKKLAMMER) then
                            begin
                              p2:=parse_paras(false,true,_RECKKLAMMER);
                              consume(_RECKKLAMMER);
                              calltype:=dct_propget;
                            end
                          else
                            p2:=nil;
                          { property setter? }
                          if (token=_ASSIGNMENT) and not(afterassignment) then
                            begin
                              consume(_ASSIGNMENT);
                              { read the expression }
                              p3:=comp_expr(true,false);
                              { concat value parameter too }
                              p2:=ccallparanode.create(p3,p2);
                              p1:=translate_disp_call(p1,p2,dct_propput,dispatchstring,0,voidtype);
                            end
                          else
                          { this is only an approximation
                            setting useresult if not necessary is only a waste of time, no more, no less (FK) }
                          if afterassignment or in_args or (token<>_SEMICOLON) then
                            p1:=translate_disp_call(p1,p2,calltype,dispatchstring,0,cvarianttype)
                          else
                            p1:=translate_disp_call(p1,p2,calltype,dispatchstring,0,voidtype);
                        end
                      else { Error }
                        Consume(_ID);
                     end;
                  classrefdef:
                    begin
                      if token=_ID then
                        begin
                          structh:=tobjectdef(tclassrefdef(p1.resultdef).pointeddef);
                          searchsym_in_class(tobjectdef(structh),tobjectdef(structh),pattern,srsym,srsymtable,true);
                          if assigned(srsym) then
                            begin
                              check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
                              consume(_ID);
                              do_member_read(structh,getaddr,srsym,p1,again,[]);
                            end
                          else
                            begin
                              Message1(sym_e_id_no_member,orgpattern);
                              p1.destroy;
                              p1:=cerrornode.create;
                              { try to clean up }
                              consume(_ID);
                            end;
                        end
                      else { Error }
                        Consume(_ID);
                    end;
                  objectdef:
                    begin
                      if token=_ID then
                        begin
                          structh:=tobjectdef(p1.resultdef);
                          searchsym_in_class(tobjectdef(structh),tobjectdef(structh),pattern,srsym,srsymtable,true);
                          if assigned(srsym) then
                            begin
                               check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
                               consume(_ID);
                               do_member_read(structh,getaddr,srsym,p1,again,[]);
                            end
                          else
                            begin
                               Message1(sym_e_id_no_member,orgpattern);
                               p1.destroy;
                               p1:=cerrornode.create;
                               { try to clean up }
                               consume(_ID);
                            end;
                        end
                      else { Error }
                        Consume(_ID);
                    end;
                  pointerdef:
                    begin
                      if (p1.resultdef=objc_idtype) then
                        begin
                          { objc's id type can be used to call any
                            Objective-C method of any Objective-C class
                            type that's currently in scope }
                          if search_objc_method(pattern,srsym,srsymtable) then
                            begin
                              consume(_ID);
                              do_proc_call(srsym,srsymtable,nil,
                                (getaddr and not(token in [_CARET,_POINT])),
                                again,p1,[cnf_objc_id_call]);
                              { we need to know which procedure is called }
                              do_typecheckpass(p1);
                            end
                          else
                            begin
                              consume(_ID);
                              Message(parser_e_methode_id_expected);
                            end;
                        end
                      else
                        begin
                          Message(parser_e_invalid_qualifier);
                          if tpointerdef(p1.resultdef).pointeddef.typ in [recorddef,objectdef,classrefdef] then
                            Message(parser_h_maybe_deref_caret_missing);
                        end
                    end;
                  else
                    begin
                      if p1.resultdef.typ<>undefineddef then
                        Message(parser_e_invalid_qualifier);
                      p1.destroy;
                      p1:=cerrornode.create;
                      { Error }
                      consume(_ID);
                    end;
               end;
             end;

          else
            begin
              { is this a procedure variable ? }
              if assigned(p1.resultdef) and
                 (p1.resultdef.typ=procvardef) then
                begin
                  { Typenode for typecasting or expecting a procvar }
                  if (p1.nodetype=typen) or
                     (
                      assigned(getprocvardef) and
                      equal_defs(p1.resultdef,getprocvardef)
                     ) then
                    begin
                      if try_to_consume(_LKLAMMER) then
                        begin
                          p1:=comp_expr(true,false);
                          consume(_RKLAMMER);
                          p1:=ctypeconvnode.create_explicit(p1,p1.resultdef);
                        end
                      else
                        again:=false
                    end
                  else
                    begin
                      if try_to_consume(_LKLAMMER) then
                        begin
                          p2:=parse_paras(false,false,_RKLAMMER);
                          consume(_RKLAMMER);
                          p1:=ccallnode.create_procvar(p2,p1);
                          { proc():= is never possible }
                          if token=_ASSIGNMENT then
                            begin
                              Message(parser_e_illegal_expression);
                              p1.free;
                              p1:=cerrornode.create;
                              again:=false;
                            end;
                        end
                      else
                        again:=false;
                    end;
                end
              else
                again:=false;
             end;
        end;

        { we only try again if p1 was changed }
        if again or
           (p1.nodetype=errorn) then
          result:=true;
      end; { while again }
    end;

    function is_member_read(sym: tsym; st: tsymtable; var p1: tnode;
                            out memberparentdef: tdef): boolean;
      var
        hdef : tdef;
      begin
        result:=true;
        memberparentdef:=nil;

        case st.symtabletype of
          ObjectSymtable,
          recordsymtable:
            begin
              memberparentdef:=tdef(st.defowner);
              exit;
            end;
          WithSymtable:
            begin
              if assigned(p1) then
               internalerror(2007012002);

              hdef:=tnode(twithsymtable(st).withrefnode).resultdef;
              p1:=tnode(twithsymtable(st).withrefnode).getcopy;

              if not(hdef.typ in [objectdef,classrefdef]) then
                exit;

              if (hdef.typ=classrefdef) then
                hdef:=tclassrefdef(hdef).pointeddef;
              memberparentdef:=hdef;
            end;
          else
            result:=false;
        end;
      end;

  {$maxfpuregisters 0}

    function factor(getaddr,typeonly:boolean) : tnode;

         {---------------------------------------------
                         Factor_read_id
         ---------------------------------------------}

       procedure factor_read_id(out p1:tnode;var again:boolean);
         var
           srsym : tsym;
           srsymtable : TSymtable;
           hdef  : tdef;
           orgstoredpattern,
           storedpattern : string;
           callflags: tcallnodeflags;
           t : ttoken;
           unit_found : boolean;
         begin
           { allow post fix operators }
           again:=true;

           { first check for identifier }
           if token<>_ID then
             begin
               srsym:=generrorsym;
               srsymtable:=nil;
               consume(_ID);
             end
           else
             begin
               if typeonly then
                 searchsym_type(pattern,srsym,srsymtable)
               else
                 searchsym(pattern,srsym,srsymtable);

               { handle unit specification like System.Writeln }
               unit_found:=try_consume_unitsym(srsym,srsymtable,t,true);
               storedpattern:=pattern;
               orgstoredpattern:=orgpattern;
               consume(t);

               { named parameter support }
               found_arg_name:=false;

               if not(unit_found) and
                  named_args_allowed and
                  (token=_ASSIGNMENT) then
                  begin
                    found_arg_name:=true;
                    p1:=cstringconstnode.createstr(storedpattern);
                    consume(_ASSIGNMENT);
                    exit;
                  end;

               { check hints, but only if it isn't a potential generic symbol;
                 that is checked in sub_expr if it isn't a generic }
               if assigned(srsym) and
                   not (
                     (srsym.typ=typesym) and
                     (ttypesym(srsym).typedef.typ in [recorddef,objectdef,arraydef,procvardef,undefineddef]) and
                     not (sp_generic_para in srsym.symoptions) and
                     (token in [_LT, _LSHARPBRACKET])
                   ) then
                 check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);

               { if nothing found give error and return errorsym }
               if not assigned(srsym) or
                   { is this a generic dummy symbol? }
                   ((srsym.typ=typesym) and
                   assigned(ttypesym(srsym).typedef) and
                   (ttypesym(srsym).typedef.typ=undefineddef) and
                   not (sp_generic_para in srsym.symoptions) and
                   not (token in [_LT, _LSHARPBRACKET]) and
                   not (
                     { in non-Delphi modes the generic class' name without a
                       "specialization" or "<T>" may be used to identify the
                       current class }
                     (sp_generic_dummy in srsym.symoptions) and
                     assigned(current_structdef) and
                     (df_generic in current_structdef.defoptions) and
                     not (m_delphi in current_settings.modeswitches) and
                     (upper(srsym.realname)=copy(current_structdef.objname^,1,pos('$',current_structdef.objname^)-1))
                   )) and
                   { it could be a rename of a generic para }
                   { Note: if this generates false positives we'll need to
                           include a "basesym" to tsym to track the original
                           symbol }
                   not (sp_explicitrename in srsym.symoptions) then
                 begin
                   identifier_not_found(orgstoredpattern);
                   srsym:=generrorsym;
                   srsymtable:=nil;
                 end;
             end;

           { Access to funcret or need to call the function? }
           if (srsym.typ in [absolutevarsym,localvarsym,paravarsym]) and
              (vo_is_funcret in tabstractvarsym(srsym).varoptions) and
              { result(x) is not allowed }
              not(vo_is_result in tabstractvarsym(srsym).varoptions) and
              (
               (token=_LKLAMMER) or
               (
                (
                 (m_tp7 in current_settings.modeswitches) or
                 (m_delphi in current_settings.modeswitches)
                ) and
                (afterassignment or in_args)
               )
              ) then
            begin
              hdef:=tdef(srsym.owner.defowner);
              if assigned(hdef) and
                 (hdef.typ=procdef) then
                srsym:=tprocdef(hdef).procsym
              else
                begin
                  Message(parser_e_illegal_expression);
                  srsym:=generrorsym;
                end;
              srsymtable:=srsym.owner;
            end;

            begin
              case srsym.typ of
                absolutevarsym :
                  begin
                    if (tabsolutevarsym(srsym).abstyp=tovar) then
                      begin
                        p1:=nil;
                        propaccesslist_to_node(p1,nil,tabsolutevarsym(srsym).ref);
                        p1:=ctypeconvnode.create(p1,tabsolutevarsym(srsym).vardef);
                        include(p1.flags,nf_absolute);
                      end
                    else
                      p1:=cloadnode.create(srsym,srsymtable);
                  end;

                staticvarsym,
                localvarsym,
                paravarsym,
                fieldvarsym :
                  begin
                    { check if we are reading a field of an object/class/   }
                    { record. is_member_read() will deal with withsymtables }
                    { if needed.                                            }
                    p1:=nil;
                    if is_member_read(srsym,srsymtable,p1,hdef) then
                      begin
                        { if the field was originally found in an     }
                        { objectsymtable, it means it's part of self  }
                        { if only method from which it was called is  }
                        { not class static                            }
                        if (srsymtable.symtabletype in [ObjectSymtable,recordsymtable]) then
                          { if we are accessing a owner procsym from the nested }
                          { class we need to call it as a class member          }
                          if assigned(current_structdef) and (current_structdef<>hdef) and is_owned_by(current_structdef,hdef) then
                            p1:=cloadvmtaddrnode.create(ctypenode.create(hdef))
                          else
                          if assigned(current_procinfo) and current_procinfo.procdef.no_self_node then
                            p1:=cloadvmtaddrnode.create(ctypenode.create(current_procinfo.procdef.struct))
                          else
                            p1:=load_self_node;
                        { now, if the field itself is part of an objectsymtab }
                        { (it can be even if it was found in a withsymtable,  }
                        {  e.g., "with classinstance do field := 5"), then    }
                        { let do_member_read handle it                        }
                        if (srsym.owner.symtabletype in [ObjectSymtable,recordsymtable]) then
                          do_member_read(tabstractrecorddef(hdef),getaddr,srsym,p1,again,[])
                        else
                          { otherwise it's a regular record subscript }
                          p1:=csubscriptnode.create(srsym,p1);
                      end
                    else
                      { regular non-field load }
                      p1:=cloadnode.create(srsym,srsymtable);
                  end;

                syssym :
                  begin
                    p1:=statement_syssym(tsyssym(srsym).number);
                  end;

                typesym :
                  begin
                    hdef:=ttypesym(srsym).typedef;
                    if not assigned(hdef) then
                     begin
                       again:=false;
                     end
                    else
                     begin
                       { We need to know if this unit uses Variants }
                       if (hdef=cvarianttype) and
                          not(cs_compilesystem in current_settings.moduleswitches) then
                         current_module.flags:=current_module.flags or uf_uses_variants;
                       p1:=handle_factor_typenode(hdef,getaddr,again,srsym,typeonly);
                     end;
                  end;

                enumsym :
                  begin
                    p1:=genenumnode(tenumsym(srsym));
                  end;

                constsym :
                  begin
                    if tconstsym(srsym).consttyp=constresourcestring then
                      begin
                        p1:=cloadnode.create(srsym,srsymtable);
                        do_typecheckpass(p1);
                        p1.resultdef:=getansistringdef;
                      end
                    else
                      p1:=genconstsymtree(tconstsym(srsym));
                  end;

                procsym :
                  begin
                    p1:=nil;
                    { check if it's a method/class method }
                    if is_member_read(srsym,srsymtable,p1,hdef) then
                      begin
                        { if we are accessing a owner procsym from the nested }
                        { class we need to call it as a class member          }
                        if (srsymtable.symtabletype in [ObjectSymtable,recordsymtable]) and
                          assigned(current_structdef) and (current_structdef<>hdef) and is_owned_by(current_structdef,hdef) then
                          p1:=cloadvmtaddrnode.create(ctypenode.create(hdef));
                        { not srsymtable.symtabletype since that can be }
                        { withsymtable as well                          }
                        if (srsym.owner.symtabletype in [ObjectSymtable,recordsymtable]) then
                          do_member_read(tabstractrecorddef(hdef),getaddr,srsym,p1,again,[])
                        else
                          { no procsyms in records (yet) }
                          internalerror(2007012006);
                      end
                    else
                      begin
                        { regular procedure/function call }
                        if not unit_found then
                          callflags:=[]
                        else
                          callflags:=[cnf_unit_specified];
                        do_proc_call(srsym,srsymtable,nil,
                                     (getaddr and not(token in [_CARET,_POINT,_LECKKLAMMER])),
                                     again,p1,callflags);
                      end;
                  end;

                propertysym :
                  begin
                    p1:=nil;
                    { property of a class/object? }
                    if is_member_read(srsym,srsymtable,p1,hdef) then
                      begin
                        if (srsymtable.symtabletype in [ObjectSymtable,recordsymtable]) then
                          { if we are accessing a owner procsym from the nested }
                          { class we need to call it as a class member          }
                          if assigned(current_structdef) and (current_structdef<>hdef) and is_owned_by(current_structdef,hdef) then
                            p1:=cloadvmtaddrnode.create(ctypenode.create(hdef))
                          else
                          if assigned(current_procinfo) and current_procinfo.procdef.no_self_node then
                          { no self node in static class methods }
                            p1:=cloadvmtaddrnode.create(ctypenode.create(hdef))
                          else
                            p1:=load_self_node;
                        { not srsymtable.symtabletype since that can be }
                        { withsymtable as well                          }
                        if (srsym.owner.symtabletype in [ObjectSymtable,recordsymtable]) then
                          do_member_read(tabstractrecorddef(hdef),getaddr,srsym,p1,again,[])
                        else
                          { no propertysyms in records (yet) }
                          internalerror(2009111510);
                      end
                    else
                    { no method pointer }
                      begin
                        handle_propertysym(tpropertysym(srsym),srsymtable,p1);
                      end;
                  end;

                labelsym :
                  begin
                    { Support @label }
                    if getaddr then
                      begin
                        if srsym.owner<>current_procinfo.procdef.localst then
                          CGMessage(parser_e_label_outside_proc);
                        p1:=cloadnode.create(srsym,srsym.owner)
                      end
                    else
                      begin
                        consume(_COLON);
                        if tlabelsym(srsym).defined then
                          Message(sym_e_label_already_defined);
                        if symtablestack.top.symtablelevel<>srsymtable.symtablelevel then
                          begin
                            tlabelsym(srsym).nonlocal:=true;
                            exclude(current_procinfo.procdef.procoptions,po_inline);
                          end;
                        if tlabelsym(srsym).nonlocal and
                          (current_procinfo.procdef.proctypeoption in [potype_unitinit,potype_unitfinalize]) then
                          Message(sym_e_interprocgoto_into_init_final_code_not_allowed);
                        tlabelsym(srsym).defined:=true;
                        p1:=clabelnode.create(nil,tlabelsym(srsym));
                        tlabelsym(srsym).code:=p1;
                      end;
                  end;

                errorsym :
                  begin
                    p1:=cerrornode.create;
                    if try_to_consume(_LKLAMMER) then
                     begin
                       parse_paras(false,false,_RKLAMMER);
                       consume(_RKLAMMER);
                     end;
                  end;

                else
                  begin
                    p1:=cerrornode.create;
                    Message(parser_e_illegal_expression);
                  end;
              end; { end case }
            end;
         end;

         {---------------------------------------------
                         Factor_Read_Set
         ---------------------------------------------}

         { Read a set between [] }
         function factor_read_set:tnode;
         var
           p1,p2 : tnode;
           lastp,
           buildp : tarrayconstructornode;
           old_allow_array_constructor : boolean;
         begin
           buildp:=nil;
         { be sure that a least one arrayconstructn is used, also for an
           empty [] }
           if token=_RECKKLAMMER then
             buildp:=carrayconstructornode.create(nil,buildp)
           else
            repeat
              { nested array constructors are not allowed, see also tests/webtbs/tw17213.pp }
              old_allow_array_constructor:=allow_array_constructor;
              allow_array_constructor:=false;
              p1:=comp_expr(true,false);
              if try_to_consume(_POINTPOINT) then
                begin
                  p2:=comp_expr(true,false);
                  p1:=carrayconstructorrangenode.create(p1,p2);
                end;
               { insert at the end of the tree, to get the correct order }
             if not assigned(buildp) then
               begin
                 buildp:=carrayconstructornode.create(p1,nil);
                 lastp:=buildp;
               end
             else
               begin
                 lastp.right:=carrayconstructornode.create(p1,nil);
                 lastp:=tarrayconstructornode(lastp.right);
               end;
             allow_array_constructor:=old_allow_array_constructor;
           { there could be more elements }
           until not try_to_consume(_COMMA);
           factor_read_set:=buildp;
         end;


      {---------------------------------------------
                      Factor (Main)
      ---------------------------------------------}

      var
         l          : longint;
         ic         : int64;
         qc         : qword;
         p1         : tnode;
         code       : integer;
         srsym      : tsym;
         srsymtable : TSymtable;
         pd         : tprocdef;
         hclassdef  : tobjectdef;
         d          : bestreal;
         cur        : currency;
         hs,hsorg   : string;
         hdef       : tdef;
         filepos    : tfileposinfo;
         callflags  : tcallnodeflags;
         again,
         updatefpos,
         nodechanged  : boolean;
      begin
        { can't keep a copy of p1 and compare pointers afterwards, because
          p1 may be freed and reallocated in the same place!  }
        updatefpos:=false;
        p1:=nil;
        filepos:=current_tokenpos;
        again:=false;
        if token=_ID then
         begin
           again:=true;
           { Handle references to self }
           if (idtoken=_SELF) and
              not(block_type in [bt_const,bt_type,bt_const_type,bt_var_type]) and
              assigned(current_structdef) then
             begin
               p1:=load_self_node;
               consume(_ID);
               again:=true;
             end
           else
             factor_read_id(p1,again);

           if assigned(p1) then
            begin
              { factor_read_id will set the filepos to after the id,
                and in case of _SELF the filepos will already be the
                same as filepos (so setting it again doesn't hurt).  }
              p1.fileinfo:=filepos;
              filepos:=current_tokenpos;
            end;
           { handle post fix operators }
           updatefpos:=postfixoperators(p1,again,getaddr);
         end
        else
         begin
           updatefpos:=true;
           case token of
             _RETURN :
                begin
                  consume(_RETURN);
                  if not(token in [_SEMICOLON,_ELSE,_END]) then
                    p1 := cexitnode.create(comp_expr(true,false))
                  else
                    p1 := cexitnode.create(nil);
                end;
             _INHERITED :
               begin
                 again:=true;
                 consume(_INHERITED);
                 if assigned(current_procinfo) and
                    assigned(current_structdef) and
                    (current_structdef.typ=objectdef) then
                  begin
                    { for record helpers in mode Delphi "inherited" is not
                      allowed }
                    if is_objectpascal_helper(current_structdef) and
                        (m_delphi in current_settings.modeswitches) and
                        is_record(tobjectdef(current_structdef).extendeddef) then
                      Message(parser_e_inherited_not_in_record);
                    hclassdef:=tobjectdef(current_structdef).childof;
                    { Objective-C categories *replace* methods in the class
                      they extend, or add methods to it. So calling an
                      inherited method always calls the method inherited from
                      the parent of the extended class }
                    if is_objccategory(current_structdef) then
                      hclassdef:=hclassdef.childof;
                    { if inherited; only then we need the method with
                      the same name }
                    if token <> _ID then
                     begin
                       hs:=current_procinfo.procdef.procsym.name;
                       hsorg:=current_procinfo.procdef.procsym.realname;
                       anon_inherited:=true;
                       { For message methods we need to search using the message
                         number or string }
                       pd:=tprocdef(tprocsym(current_procinfo.procdef.procsym).ProcdefList[0]);
                       srdef:=nil;
                       if (po_msgint in pd.procoptions) then
                         searchsym_in_class_by_msgint(hclassdef,pd.messageinf.i,srdef,srsym,srsymtable)
                       else
                        if (po_msgstr in pd.procoptions) then
                          searchsym_in_class_by_msgstr(hclassdef,pd.messageinf.str^,srsym,srsymtable)
                       else
                       { helpers have their own ways of dealing with inherited }
                       if is_objectpascal_helper(current_structdef) then
                         searchsym_in_helper(tobjectdef(current_structdef),tobjectdef(current_structdef),hs,srsym,srsymtable,true)
                       else
                         searchsym_in_class(hclassdef,tobjectdef(current_structdef),hs,srsym,srsymtable,true);
                     end
                    else
                     begin
                       hs:=pattern;
                       hsorg:=orgpattern;
                       consume(_ID);
                       anon_inherited:=false;
                       { helpers have their own ways of dealing with inherited }
                       if is_objectpascal_helper(current_structdef) then
                         searchsym_in_helper(tobjectdef(current_structdef),tobjectdef(current_structdef),hs,srsym,srsymtable,true)
                       else
                         searchsym_in_class(hclassdef,tobjectdef(current_structdef),hs,srsym,srsymtable,true);
                     end;
                    if assigned(srsym) then
                     begin
                       check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
                       { load the procdef from the inherited class and
                         not from self }
                       case srsym.typ of
                         procsym:
                           begin
                             if is_objectpascal_helper(current_structdef) then
                               begin
                                 { for a helper load the procdef either from the
                                   extended type, from the parent helper or from
                                   the extended type of the parent helper
                                   depending on the def the found symbol belongs
                                   to }
                                 if (srsym.Owner.defowner.typ=objectdef) and
                                     is_objectpascal_helper(tobjectdef(srsym.Owner.defowner)) then
                                   if current_structdef.is_related(tdef(srsym.Owner.defowner)) and
                                       assigned(tobjectdef(current_structdef).childof) then
                                     hdef:=tobjectdef(current_structdef).childof
                                   else
                                     hdef:=tobjectdef(srsym.Owner.defowner).extendeddef
                                 else
                                   hdef:=tdef(srsym.Owner.defowner);
                               end
                             else
                               hdef:=hclassdef;
                             if (po_classmethod in current_procinfo.procdef.procoptions) or
                                (po_staticmethod in current_procinfo.procdef.procoptions) then
                               hdef:=tclassrefdef.create(hdef);
                             p1:=ctypenode.create(hdef);
                             { we need to allow helpers here }
                             ttypenode(p1).helperallowed:=true;
                           end;
                         propertysym:
                           ;
                         else
                           begin
                             Message(parser_e_methode_id_expected);
                             p1:=cerrornode.create;
                           end;
                       end;
                       callflags:=[cnf_inherited];
                       if anon_inherited then
                         include(callflags,cnf_anon_inherited);
                       do_member_read(hclassdef,getaddr,srsym,p1,again,callflags);
                     end
                    else
                     begin
                       if anon_inherited then
                        begin
                          { For message methods we need to call DefaultHandler }
                          if (po_msgint in pd.procoptions) or
                             (po_msgstr in pd.procoptions) then
                            begin
                              searchsym_in_class(hclassdef,hclassdef,'DEFAULTHANDLER',srsym,srsymtable,true);
                              if not assigned(srsym) or
                                 (srsym.typ<>procsym) then
                                internalerror(200303171);
                              p1:=nil;
                              do_proc_call(srsym,srsym.owner,hclassdef,false,again,p1,[]);
                            end
                          else
                            begin
                              { we need to ignore the inherited; }
                              p1:=cnothingnode.create;
                            end;
                        end
                       else
                        begin
                          Message1(sym_e_id_no_member,hsorg);
                          p1:=cerrornode.create;
                        end;
                       again:=false;
                     end;
                    { turn auto inheriting off }
                    anon_inherited:=false;
                  end
                 else
                   begin
                     { in case of records we use a more clear error message }
                     if assigned(current_structdef) and
                         (current_structdef.typ=recorddef) then
                       Message(parser_e_inherited_not_in_record)
                     else
                       Message(parser_e_generic_methods_only_in_methods);
                     again:=false;
                     p1:=cerrornode.create;
                   end;
                 postfixoperators(p1,again,getaddr);
               end;

             _INTCONST :
               begin
                 {Try first wether the value fits in an int64.}
                 val(pattern,ic,code);
                 if code=0 then
                   begin
                      consume(_INTCONST);
                      int_to_type(ic,hdef);
                      p1:=cordconstnode.create(ic,hdef,true);
                   end
                 else
                   begin
                     { try qword next }
                     val(pattern,qc,code);
                     if code=0 then
                       begin
                          consume(_INTCONST);
                          int_to_type(qc,hdef);
                          p1:=cordconstnode.create(qc,hdef,true);
                       end;
                   end;
                 if code<>0 then
                   begin
                     { finally float }
                     val(pattern,d,code);
                     if code<>0 then
                       begin
                          Message(parser_e_invalid_integer);
                          consume(_INTCONST);
                          l:=1;
                          p1:=cordconstnode.create(l,sinttype,true);
                       end
                     else
                       begin
                          consume(_INTCONST);
                          p1:=crealconstnode.create(d,pbestrealtype^);
                       end;
                   end
                 else
                   { the necessary range checking has already been done by val }
                   tordconstnode(p1).rangecheck:=false;
               end;

             _REALNUMBER :
               begin
                 val(pattern,d,code);
                 if code<>0 then
                  begin
                    Message(parser_e_error_in_real);
                    d:=1.0;
                  end;
                 consume(_REALNUMBER);
{$ifdef FPC_REAL2REAL_FIXED}
                 if current_settings.fputype=fpu_none then
                   Message(parser_e_unsupported_real);
                 if (current_settings.minfpconstprec=s32real) and
                    (d = single(d)) then
                   p1:=crealconstnode.create(d,s32floattype)
                 else if (current_settings.minfpconstprec=s64real) and
                         (d = double(d)) then
                   p1:=crealconstnode.create(d,s64floattype)
                 else
{$endif FPC_REAL2REAL_FIXED}
                   p1:=crealconstnode.create(d,pbestrealtype^);
{$ifdef FPC_HAS_STR_CURRENCY}
                 val(pattern,cur,code);
                 if code=0 then
                   trealconstnode(p1).value_currency:=cur;
{$endif FPC_HAS_STR_CURRENCY}
               end;

             _STRING :
               begin
                 string_dec(hdef,true);
                 { STRING can be also a type cast }
                 if try_to_consume(_LKLAMMER) then
                  begin
                    p1:=comp_expr(true,false);
                    consume(_RKLAMMER);
                    p1:=ctypeconvnode.create_explicit(p1,hdef);
                    { handle postfix operators here e.g. string(a)[10] }
                    again:=true;
                    postfixoperators(p1,again,getaddr);
                  end
                 else
                  p1:=ctypenode.create(hdef);
               end;

             _FILE :
               begin
                 hdef:=cfiletype;
                 consume(_FILE);
                 { FILE can be also a type cast }
                 if try_to_consume(_LKLAMMER) then
                  begin
                    p1:=comp_expr(true,false);
                    consume(_RKLAMMER);
                    p1:=ctypeconvnode.create_explicit(p1,hdef);
                    { handle postfix operators here e.g. string(a)[10] }
                    again:=true;
                    postfixoperators(p1,again,getaddr);
                  end
                 else
                  begin
                    p1:=ctypenode.create(hdef);
                  end;
               end;

             _CSTRING :
               begin
                 p1:=cstringconstnode.createpchar(ansistring2pchar(cstringpattern),length(cstringpattern));
                 consume(_CSTRING);
               end;

             _CCHAR :
               begin
                 p1:=cordconstnode.create(ord(pattern[1]),cchartype,true);
                 consume(_CCHAR);
               end;

             _CWSTRING:
               begin
                 p1:=cstringconstnode.createwstr(patternw);
                 consume(_CWSTRING);
               end;

             _CWCHAR:
               begin
                 p1:=cordconstnode.create(ord(getcharwidestring(patternw,0)),cwidechartype,true);
                 consume(_CWCHAR);
               end;

             _KLAMMERAFFE :
               begin
                 consume(_KLAMMERAFFE);
                 got_addrn:=true;
                 { support both @<x> and @(<x>) }
                 if try_to_consume(_LKLAMMER) then
                  begin
                    p1:=factor(true,false);
                    if token in [_CARET,_POINT,_LECKKLAMMER] then
                     begin
                       again:=true;
                       postfixoperators(p1,again,getaddr);
                     end
                    else
                    consume(_RKLAMMER);
                  end
                 else
                  p1:=factor(true,false);
                 if token in [_CARET,_POINT,_LECKKLAMMER] then
                  begin
                    again:=true;
                    postfixoperators(p1,again,getaddr);
                  end;
                 got_addrn:=false;
                 p1:=caddrnode.create(p1);
                 p1.fileinfo:=filepos;
                 if cs_typed_addresses in current_settings.localswitches then
                   include(p1.flags,nf_typedaddr);
                 { Store the procvar that we are expecting, the
                   addrn will use the information to find the correct
                   procdef or it will return an error }
                 if assigned(getprocvardef) and
                    (taddrnode(p1).left.nodetype = loadn) then
                   taddrnode(p1).getprocvardef:=getprocvardef;
               end;

             _LKLAMMER :
               begin
                 consume(_LKLAMMER);
                 p1:=comp_expr(true,false);
                 consume(_RKLAMMER);
                 { it's not a good solution     }
                 { but (a+b)^ makes some problems  }
                 if token in [_CARET,_POINT,_LECKKLAMMER] then
                  begin
                    again:=true;
                    postfixoperators(p1,again,getaddr);
                  end;
               end;

             _LECKKLAMMER :
               begin
                 consume(_LECKKLAMMER);
                 p1:=factor_read_set;
                 consume(_RECKKLAMMER);
               end;

             _PLUS :
               begin
                 consume(_PLUS);
                 p1:=factor(false,false);
                 p1:=cunaryplusnode.create(p1);
               end;

             _MINUS :
               begin
                 consume(_MINUS);
                 if (token = _INTCONST) and not(m_isolike_unary_minus in current_settings.modeswitches) then
                    begin
                      { ugly hack, but necessary to be able to parse }
                      { -9223372036854775808 as int64 (JM)           }
                      pattern := '-'+pattern;
                      p1:=sub_expr(oppower,false,false,nil);
                      {  -1 ** 4 should be - (1 ** 4) and not
                         (-1) ** 4
                         This was the reason of tw0869.pp test failure PM }
                      if p1.nodetype=starstarn then
                        begin
                          if tbinarynode(p1).left.nodetype=ordconstn then
                            begin
                              tordconstnode(tbinarynode(p1).left).value:=-tordconstnode(tbinarynode(p1).left).value;
                              p1:=cunaryminusnode.create(p1);
                            end
                          else if tbinarynode(p1).left.nodetype=realconstn then
                            begin
                              trealconstnode(tbinarynode(p1).left).value_real:=-trealconstnode(tbinarynode(p1).left).value_real;
                              trealconstnode(tbinarynode(p1).left).value_currency:=-trealconstnode(tbinarynode(p1).left).value_currency;
                              p1:=cunaryminusnode.create(p1);
                            end
                          else
                            internalerror(20021029);
                        end;
                    end
                 else
                   begin
                     if m_isolike_unary_minus in current_settings.modeswitches then
                       p1:=sub_expr(opmultiply,false,false,nil)
                     else
                       p1:=sub_expr(oppower,false,false,nil);

                     p1:=cunaryminusnode.create(p1);
                   end;
               end;

             _OP_NOT :
               begin
                 consume(_OP_NOT);
                 p1:=factor(false,false);
                 p1:=cnotnode.create(p1);
               end;

             _TRUE :
               begin
                 consume(_TRUE);
                 p1:=cordconstnode.create(1,pasbool8type,false);
               end;

             _FALSE :
               begin
                 consume(_FALSE);
                 p1:=cordconstnode.create(0,pasbool8type,false);
               end;

             _NIL :
               begin
                 consume(_NIL);
                 p1:=cnilnode.create;
                 { It's really ugly code nil^, but delphi allows it }
                 if token in [_CARET] then
                  begin
                    again:=true;
                    postfixoperators(p1,again,getaddr);
                  end;
               end;
           _OBJCPROTOCOL:
             begin
               { The @protocol keyword is used in two ways in Objective-C:
                   1) to declare protocols (~ Object Pascal interfaces)
                   2) to obtain the metaclass (~ Object Pascal) "class of")
                      of a declared protocol
                 This code is for handling the second case. Because of 1),
                 we cannot simply use a system unit symbol.
               }
               consume(_OBJCPROTOCOL);
               consume(_LKLAMMER);
               p1:=factor(false,false);
               consume(_RKLAMMER);
               p1:=cinlinenode.create(in_objc_protocol_x,false,p1);
             end;

             else
               begin
                 Message(parser_e_illegal_expression);
                 p1:=cerrornode.create;
                 { recover }
                 consume(token);
               end;
           end;
        end;

        { generate error node if no node is created }
        if not assigned(p1) then
         begin
{$ifdef EXTDEBUG}
           Comment(V_Warning,'factor: p1=nil');
{$endif}
           p1:=cerrornode.create;
           updatefpos:=true;
         end;

        { get the resultdef for the node }
        if (not assigned(p1.resultdef)) then
          begin
            do_typecheckpass_changed(p1,nodechanged);
            updatefpos:=updatefpos or nodechanged;
          end;

        if assigned(p1) and
           updatefpos then
          p1.fileinfo:=filepos;
        factor:=p1;
      end;
  {$maxfpuregisters default}

    procedure post_comp_expr_gendef(var def: tdef);
      var
        p1 : tnode;
        again : boolean;
      begin
        if not assigned(def) then
          internalerror(2011053001);
        again:=false;
        { handle potential typecasts, etc }
        p1:=handle_factor_typenode(def,false,again,nil,false);
        { parse postfix operators }
        postfixoperators(p1,again,false);
        if assigned(p1) and (p1.nodetype=typen) then
          def:=ttypenode(p1).typedef
        else
          def:=generrordef;
      end;

{****************************************************************************
                             Sub_Expr
****************************************************************************}
   const
      { Warning these stay be ordered !! }
      operator_levels:array[Toperator_precedence] of set of NOTOKEN..last_operator=
         ([_LT,_LTE,_GT,_GTE,_EQ,_NE,_OP_IN],
          [_PLUS,_MINUS,_OP_OR,_PIPE,_OP_XOR],
          [_CARET,_SYMDIF,_STARSTAR,_STAR,_SLASH,
           _OP_AS,_OP_IS,_OP_AND,_AMPERSAND,_OP_DIV,_OP_MOD,_OP_SHL,_OP_SHR],
          [_STARSTAR] );

    function sub_expr(pred_level:Toperator_precedence;accept_equal,typeonly:boolean;factornode:tnode):tnode;
    {Reads a subexpression while the operators are of the current precedence
     level, or any higher level. Replaces the old term, simpl_expr and
     simpl2_expr.}

      function istypenode(n:tnode):boolean;inline;
      { Checks whether the given node is a type node or a VMT node containing a
        typenode. This is used in the code for inline specializations in the
        _LT branch below }
        begin
          result:=assigned(n) and
                    (
                      (n.nodetype=typen) or
                      (
                        (n.nodetype=loadvmtaddrn) and
                        (tloadvmtaddrnode(n).left.nodetype=typen)
                      )
                    );
        end;

      function gettypedef(n:tnode):tdef;inline;
      { This returns the typedef that belongs to the given typenode or
        loadvmtaddrnode. n must not be Nil! }
        begin
          if n.nodetype=typen then
            result:=ttypenode(n).typedef
          else
            result:=ttypenode(tloadvmtaddrnode(n).left).typedef;
        end;

      function getgenericsym(n:tnode;out srsym:tsym):boolean;
        var
          srsymtable : tsymtable;
        begin
          srsym:=nil;
          case n.nodetype of
            typen:
              srsym:=ttypenode(n).typedef.typesym;
            loadvmtaddrn:
              srsym:=ttypenode(tloadvmtaddrnode(n).left).typedef.typesym;
            loadn:
              if not searchsym_with_symoption(tloadnode(n).symtableentry.Name,srsym,srsymtable,sp_generic_dummy) then
                srsym:=nil;
            { TODO : handle const nodes }
          end;
          result:=assigned(srsym);
        end;

      label
        SubExprStart;
      var
        p1,p2   : tnode;
        oldt    : Ttoken;
        filepos : tfileposinfo;
        again   : boolean;
        gendef,parseddef : tdef;
        gensym : tsym;
      begin
        SubExprStart:
        if pred_level=highest_precedence then
          begin
            if factornode=nil then
              p1:=factor(false,typeonly)
            else
              p1:=factornode;
          end
        else
          p1:=sub_expr(succ(pred_level),true,typeonly,factornode);
        repeat
          if (token in [NOTOKEN..last_operator]) and
             (token in operator_levels[pred_level]) and
             ((token<>_EQ) or accept_equal) then
           begin
             oldt:=token;
             filepos:=current_tokenpos;
             consume(token);
             if pred_level=highest_precedence then
               p2:=factor(false,false)
             else
               p2:=sub_expr(succ(pred_level),true,typeonly,nil);
             case oldt of
               _PLUS :
                 p1:=caddnode.create(addn,p1,p2);
               _MINUS :
                 p1:=caddnode.create(subn,p1,p2);
               _STAR :
                 p1:=caddnode.create(muln,p1,p2);
               _SLASH :
                 p1:=caddnode.create(slashn,p1,p2);
               _EQ:
                 p1:=caddnode.create(equaln,p1,p2);
               _GT :
                 p1:=caddnode.create(gtn,p1,p2);
               _LT :
                 begin
                   { we need to decice whether we have an inline specialization
                     (type nodes to the left and right of "<", mode Delphi and
                     ">" or "," following) or a normal "<" comparison }
                   { TODO : p1 could be a non type if e.g. a variable with the
                            same name is defined in the same unit where the
                            generic is defined (though "same unit" is not
                            necessarily needed) }
                   if getgenericsym(p1,gensym) and
                      { Attention: when nested specializations are supported
                                   p2 could be a loadn if a "<" follows }
                      istypenode(p2) and
                       (m_delphi in current_settings.modeswitches) and
                       { TODO : add _LT, _LSHARPBRACKET for nested specializations }
                       (token in [_GT,_RSHARPBRACKET,_COMMA]) then
                     begin
                       { this is an inline specialization }

                       { retrieve the defs of two nodes }
                       gendef:=nil;
                       parseddef:=gettypedef(p2);

                       if parseddef.typesym.typ<>typesym then
                         Internalerror(2011051001);

                       { check the hints for parseddef }
                       check_hints(parseddef.typesym,parseddef.typesym.symoptions,parseddef.typesym.deprecatedmsg);

                       { generate the specialization }
                       generate_specialization(gendef,false,'',parseddef,gensym.RealName);

                       { we don't need the old left and right nodes anymore }
                       p1.Free;
                       p2.Free;
                       { in case of a class or a record the specialized generic
                         is always a classrefdef }
                       again:=false;
                       { handle potential typecasts, etc }
                       p1:=handle_factor_typenode(gendef,false,again,nil,false);
                       { parse postfix operators }
                       if postfixoperators(p1,again,false) then
                         if assigned(p1) then
                           p1.fileinfo:=filepos
                         else
                           p1:=cerrornode.create;

                       { with p1 now set we are in reality directly behind the
                         call to "factor" thus we need to call down to that
                         again }
                       { This is disabled until specializations on the right
                         hand side work as well, because
                         "not working expressions" is better than "half working
                         expressions" }
                       {factornode:=p1;
                       goto SubExprStart;}
                     end
                   else
                     begin
                       { this is a normal "<" comparison }

                       { potential generic types that are followed by a "<" }

                       { a) are not checked whether they are an undefined def,
                            but not a generic parameter }
                       if (p1.nodetype=typen) and
                           (ttypenode(p1).typedef.typ=undefineddef) and
                           assigned(ttypenode(p1).typedef.typesym) and
                           not (sp_generic_para in ttypenode(p1).typedef.typesym.symoptions) then
                         begin
                           identifier_not_found(ttypenode(p1).typedef.typesym.RealName);
                           p1.Free;
                           p1:=cerrornode.create;
                         end;

                       { b) don't have their hints checked }
                       if istypenode(p1) then
                         begin
                           gendef:=gettypedef(p1);
                           if gendef.typ in [objectdef,recorddef,arraydef,procvardef] then
                             check_hints(gendef.typesym,gendef.typesym.symoptions,gendef.typesym.deprecatedmsg);
                         end;

                       { Note: the second part of the expression will be needed
                               for nested specializations }
                       if istypenode(p2) {and
                           not (token in [_LT, _LSHARPBRACKET])} then
                         begin
                           gendef:=gettypedef(p2);
                           if gendef.typ in [objectdef,recorddef,arraydef,procvardef] then
                             check_hints(gendef.typesym,gendef.typesym.symoptions,gendef.typesym.deprecatedmsg);
                         end;

                       { create the comparison node for "<" }
                       p1:=caddnode.create(ltn,p1,p2)
                     end;
                 end;
               _GTE :
                 p1:=caddnode.create(gten,p1,p2);
               _LTE :
                 p1:=caddnode.create(lten,p1,p2);
               _SYMDIF :
                 p1:=caddnode.create(symdifn,p1,p2);
               _STARSTAR :
                 p1:=caddnode.create(starstarn,p1,p2);
               _OP_AS,
               _OP_IS :
                 begin
                   if token in [_LT, _LSHARPBRACKET] then
                     begin
                       { for now we're handling this as a generic declaration;
                         there could be cases though (because of operator
                         overloading) where this is the wrong decision... }
                       { TODO : here the same note as in _LT applies as p2 could
                                point to a variable, etc }
                       gendef:=gettypedef(p2);

                       if gendef.typesym.typ<>typesym then
                         Internalerror(2011071401);

                       { generate the specialization }
                       generate_specialization(gendef,false,'',nil,'');

                       { we don't need the old p2 anymore }
                       p2.Free;

                       again:=false;
                       { handle potential typecasts, etc }
                       p2:=handle_factor_typenode(gendef,false,again,nil,false);
                       { parse postfix operators }
                       if postfixoperators(p2,again,false) then
                         if assigned(p2) then
                           p2.fileinfo:=filepos
                         else
                           p2:=cerrornode.create;

                       { here we don't need to call back down to "factor", thus
                         no "goto" }
                     end;

                   { now generate the "is" or "as" node }
                   case oldt of
                     _OP_AS:
                       p1:=casnode.create(p1,p2);
                     _OP_IS:
                       p1:=cisnode.create(p1,p2);
                   end;
                 end;
               _OP_IN :
                 p1:=cinnode.create(p1,p2);
               _OP_OR,
               _PIPE {macpas only} :
                 begin
                   p1:=caddnode.create(orn,p1,p2);
                   if (oldt = _PIPE) then
                     include(p1.flags,nf_short_bool);
                 end;
               _OP_AND,
               _AMPERSAND {macpas only} :
                 begin
                   p1:=caddnode.create(andn,p1,p2);
                   if (oldt = _AMPERSAND) then
                     include(p1.flags,nf_short_bool);
                 end;
               _OP_DIV :
                 p1:=cmoddivnode.create(divn,p1,p2);
               _OP_NOT :
                 p1:=cnotnode.create(p1);
               _OP_MOD :
                 begin
                   p1:=cmoddivnode.create(modn,p1,p2);
                   if m_iso in current_settings.modeswitches then
                     include(p1.flags,nf_isomod);
                 end;
               _OP_SHL :
                 p1:=cshlshrnode.create(shln,p1,p2);
               _OP_SHR :
                 p1:=cshlshrnode.create(shrn,p1,p2);
               _OP_XOR :
                 p1:=caddnode.create(xorn,p1,p2);
               _ASSIGNMENT :
                 p1:=cassignmentnode.create(p1,p2);
               _NE :
                 p1:=caddnode.create(unequaln,p1,p2);
             end;
             p1.fileinfo:=filepos;
           end
          else
           break;
        until false;
        sub_expr:=p1;
      end;


    function comp_expr(accept_equal,typeonly:boolean):tnode;
      var
         oldafterassignment : boolean;
         p1 : tnode;
      begin
         oldafterassignment:=afterassignment;
         afterassignment:=true;
         p1:=sub_expr(opcompare,accept_equal,typeonly,nil);
         { get the resultdef for this expression }
         if not assigned(p1.resultdef) then
          do_typecheckpass(p1);
         afterassignment:=oldafterassignment;
         comp_expr:=p1;
      end;


    function expr(dotypecheck : boolean) : tnode;

      var
         p1,p2 : tnode;
         filepos : tfileposinfo;
         oldafterassignment,
         updatefpos          : boolean;

      begin
         oldafterassignment:=afterassignment;
         p1:=sub_expr(opcompare,true,false,nil);
         { get the resultdef for this expression }
         if not assigned(p1.resultdef) and
            dotypecheck then
          do_typecheckpass(p1);
         filepos:=current_tokenpos;
         if token in [_ASSIGNMENT,_PLUSASN,_MINUSASN,_STARASN,_SLASHASN] then
           afterassignment:=true;
         updatefpos:=true;
         case token of
           _POINTPOINT :
             begin
                consume(_POINTPOINT);
                p2:=sub_expr(opcompare,true,false,nil);
                p1:=crangenode.create(p1,p2);
             end;
           _ASSIGNMENT :
             begin
                consume(_ASSIGNMENT);
                if assigned(p1.resultdef) and (p1.resultdef.typ=procvardef) then
                  getprocvardef:=tprocvardef(p1.resultdef);
                p2:=sub_expr(opcompare,true,false,nil);
                if assigned(getprocvardef) then
                  handle_procvar(getprocvardef,p2);
                getprocvardef:=nil;
                p1:=cassignmentnode.create(p1,p2);
             end;
           _PLUSASN :
             begin
               consume(_PLUSASN);
               p2:=sub_expr(opcompare,true,false,nil);
               p1:=gen_c_style_operator(addn,p1,p2);
            end;
          _MINUSASN :
            begin
               consume(_MINUSASN);
               p2:=sub_expr(opcompare,true,false,nil);
               p1:=gen_c_style_operator(subn,p1,p2);
            end;
          _STARASN :
            begin
               consume(_STARASN  );
               p2:=sub_expr(opcompare,true,false,nil);
               p1:=gen_c_style_operator(muln,p1,p2);
            end;
          _SLASHASN :
            begin
               consume(_SLASHASN  );
               p2:=sub_expr(opcompare,true,false,nil);
               p1:=gen_c_style_operator(slashn,p1,p2);
            end;
          else
            updatefpos:=false;
         end;
         { get the resultdef for this expression }
         if not assigned(p1.resultdef) and
            dotypecheck then
          do_typecheckpass(p1);
         afterassignment:=oldafterassignment;
         if updatefpos then
           p1.fileinfo:=filepos;
         expr:=p1;
      end;

    function get_intconst:TConstExprInt;
    {Reads an expression, tries to evalute it and check if it is an integer
     constant. Then the constant is returned.}
    var
      p:tnode;
    begin
      result:=0;
      p:=comp_expr(true,false);
      if not codegenerror then
       begin
         if (p.nodetype<>ordconstn) or
            not(is_integer(p.resultdef)) then
          Message(parser_e_illegal_expression)
         else
          result:=tordconstnode(p).value;
       end;
      p.free;
    end;


    function get_stringconst:string;
    {Reads an expression, tries to evaluate it and checks if it is a string
     constant. Then the constant is returned.}
    var
      p:tnode;
    begin
      get_stringconst:='';
      p:=comp_expr(true,false);
      if p.nodetype<>stringconstn then
        begin
          if (p.nodetype=ordconstn) and is_char(p.resultdef) then
            get_stringconst:=char(int64(tordconstnode(p).value))
          else
            Message(parser_e_illegal_expression);
        end
      else
        get_stringconst:=strpas(tstringconstnode(p).value_str);
      p.free;
    end;

end.