freepascal.compiler/compiler/ncgrtti.pas

{
    Copyright (c) 1998-2002 by Florian Klaempfl

    Routines for the code generation of RTTI data structures

    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 ncgrtti;

{$i fpcdefs.inc}

interface

    uses
      cclasses,constexp,
      aasmbase,
      symbase,symconst,symtype,symdef;

    type

      { TRTTIWriter }

      TRTTIWriter=class
      private
        function  fields_count(st:tsymtable;rt:trttitype):longint;
        procedure fields_write_rtti(st:tsymtable;rt:trttitype);
        procedure fields_write_rtti_data(st:tsymtable;rt:trttitype);
        procedure write_rtti_extrasyms(def:Tdef;rt:Trttitype;mainrtti:Tasmsymbol);
        procedure published_write_rtti(st:tsymtable;rt:trttitype);
        function  published_properties_count(st:tsymtable):longint;
        procedure published_properties_write_rtti_data(propnamelist:TFPHashObjectList;st:tsymtable);
        procedure collect_propnamelist(propnamelist:TFPHashObjectList;objdef:tobjectdef);
        procedure write_rtti_name(def:tdef);
        procedure write_rtti_data(def:tdef;rt:trttitype);
        procedure write_child_rtti_data(def:tdef;rt:trttitype);
        function  ref_rtti(def:tdef;rt:trttitype):tasmsymbol;
      public
        procedure write_rtti(def:tdef;rt:trttitype);
        function  get_rtti_label(def:tdef;rt:trttitype):tasmsymbol;
        function  get_rtti_label_ord2str(def:tdef;rt:trttitype):tasmsymbol;
        function  get_rtti_label_str2ord(def:tdef;rt:trttitype):tasmsymbol;
      end;

    var
      RTTIWriter : TRTTIWriter;


implementation

    uses
       cutils,
       globals,globtype,verbose,systems,
       fmodule,
       symsym,
       aasmtai,aasmdata,
       defutil
       ;


    const
       rttidefstate : array[trttitype] of tdefstate = (ds_rtti_table_written,ds_init_table_written);

    type
       TPropNameListItem = class(TFPHashObject)
         propindex : longint;
         propowner : TSymtable;
       end;


{***************************************************************************
                              TRTTIWriter
***************************************************************************}

    procedure TRTTIWriter.write_rtti_name(def:tdef);
      var
         hs : string;
      begin
         if is_open_array(def) then
           { open arrays never have a typesym with a name, since you cannot
             define an "open array type". Kylix prints the type of the
             elements in the array in this case (so together with the pfArray
             flag, you can reconstruct the full typename, I assume (JM))
           }
           def:=tarraydef(def).elementdef;
         { name }
         if assigned(def.typesym) then
           begin
              hs:=ttypesym(def.typesym).realname;
              current_asmdata.asmlists[al_rtti].concat(Tai_string.Create(chr(length(hs))+hs));
           end
         else
           current_asmdata.asmlists[al_rtti].concat(Tai_string.Create(#0));
      end;


    function TRTTIWriter.fields_count(st:tsymtable;rt:trttitype):longint;
      var
        i   : longint;
        sym : tsym;
      begin
        result:=0;
        for i:=0 to st.SymList.Count-1 do
          begin
            sym:=tsym(st.SymList[i]);
            if (rt=fullrtti) or
               (
                (tsym(sym).typ=fieldvarsym) and
                tfieldvarsym(sym).vardef.needs_inittable
               ) then
              inc(result);
          end;
      end;


    procedure TRTTIWriter.fields_write_rtti_data(st:tsymtable;rt:trttitype);
      var
        i   : longint;
        sym : tsym;
      begin
        for i:=0 to st.SymList.Count-1 do
          begin
            sym:=tsym(st.SymList[i]);
            if (rt=fullrtti) or
               (
                (tsym(sym).typ=fieldvarsym) and
                tfieldvarsym(sym).vardef.needs_inittable
               ) then
              begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_sym(ref_rtti(tfieldvarsym(sym).vardef,rt)));
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(tfieldvarsym(sym).fieldoffset));
              end;
          end;
      end;


    procedure TRTTIWriter.fields_write_rtti(st:tsymtable;rt:trttitype);
      var
        i   : longint;
        sym : tsym;
      begin
        for i:=0 to st.SymList.Count-1 do
          begin
            sym:=tsym(st.SymList[i]);
            if (rt=fullrtti) or
               (
                (tsym(sym).typ=fieldvarsym) and
                tfieldvarsym(sym).vardef.needs_inittable
               ) then
              write_rtti(tfieldvarsym(sym).vardef,rt);
          end;
      end;


    procedure TRTTIWriter.published_write_rtti(st:tsymtable;rt:trttitype);
      var
        i   : longint;
        sym : tsym;
      begin
        for i:=0 to st.SymList.Count-1 do
          begin
            sym:=tsym(st.SymList[i]);
            if (sym.visibility=vis_published) then
              begin
                case tsym(sym).typ of
                  propertysym:
                    write_rtti(tpropertysym(sym).propdef,rt);
                  fieldvarsym:
                    write_rtti(tfieldvarsym(sym).vardef,rt);
                end;
              end;
          end;
      end;


    function TRTTIWriter.published_properties_count(st:tsymtable):longint;
      var
        i   : longint;
        sym : tsym;
      begin
        result:=0;
        for i:=0 to st.SymList.Count-1 do
          begin
            sym:=tsym(st.SymList[i]);
            if (tsym(sym).typ=propertysym) and
               (sym.visibility=vis_published) then
              inc(result);
          end;
      end;


    procedure TRTTIWriter.collect_propnamelist(propnamelist:TFPHashObjectList;objdef:tobjectdef);
      var
        i   : longint;
        sym : tsym;
        pn  : tpropnamelistitem;
      begin
        if assigned(objdef.childof) then
          collect_propnamelist(propnamelist,objdef.childof);
        for i:=0 to objdef.symtable.SymList.Count-1 do
          begin
            sym:=tsym(objdef.symtable.SymList[i]);
            if (tsym(sym).typ=propertysym) and
               (sym.visibility=vis_published) then
              begin
                pn:=TPropNameListItem(propnamelist.Find(tsym(sym).name));
                if not assigned(pn) then
                  begin
                     pn:=tpropnamelistitem.create(propnamelist,tsym(sym).name);
                     pn.propindex:=propnamelist.count-1;
                     pn.propowner:=tsym(sym).owner;
                  end;
             end;
          end;
      end;


    procedure TRTTIWriter.published_properties_write_rtti_data(propnamelist:TFPHashObjectList;st:tsymtable);
      var
        i : longint;
        sym : tsym;
        proctypesinfo : byte;
        propnameitem  : tpropnamelistitem;

        procedure writeaccessproc(pap:tpropaccesslisttypes; shiftvalue : byte; unsetvalue: byte);
        var
           typvalue : byte;
           hp : ppropaccesslistitem;
           address,space : longint;
           def : tdef;
           hpropsym : tpropertysym;
           propaccesslist : tpropaccesslist;
        begin
           hpropsym:=tpropertysym(sym);
           repeat
             propaccesslist:=hpropsym.propaccesslist[pap];
             if not propaccesslist.empty then
               break;
             hpropsym:=hpropsym.overridenpropsym;
           until not assigned(hpropsym);
           if not(assigned(propaccesslist) and assigned(propaccesslist.firstsym))  then
             begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.create(aitconst_ptr,unsetvalue));
                typvalue:=3;
             end
           else if propaccesslist.firstsym^.sym.typ=fieldvarsym then
             begin
                address:=0;
                hp:=propaccesslist.firstsym;
                def:=nil;
                while assigned(hp) do
                  begin
                     case hp^.sltype of
                       sl_load :
                         begin
                           def:=tfieldvarsym(hp^.sym).vardef;
                           inc(address,tfieldvarsym(hp^.sym).fieldoffset);
                         end;
                       sl_subscript :
                         begin
                           if not(assigned(def) and (def.typ=recorddef)) then
                             internalerror(200402171);
                           inc(address,tfieldvarsym(hp^.sym).fieldoffset);
                           def:=tfieldvarsym(hp^.sym).vardef;
                         end;
                       sl_vec :
                         begin
                           if not(assigned(def) and (def.typ=arraydef)) then
                             internalerror(200402172);
                           def:=tarraydef(def).elementdef;
                           {Hp.value is a Tconstexprint, which can be rather large,
                            sanity check for longint overflow.}
                           space:=(high(address)-address) div def.size;
                           if int64(space)<hp^.value then
                             internalerror(200706101);
                           inc(address,int64(def.size*hp^.value));
                         end;
                     end;
                     hp:=hp^.next;
                  end;
                current_asmdata.asmlists[al_rtti].concat(Tai_const.create(aitconst_ptr,address));
                typvalue:=0;
             end
           else
             begin
                { When there was an error then procdef is not assigned }
                if not assigned(propaccesslist.procdef) then
                  exit;
                if not(po_virtualmethod in tprocdef(propaccesslist.procdef).procoptions) then
                  begin
                     current_asmdata.asmlists[al_rtti].concat(Tai_const.createname(tprocdef(propaccesslist.procdef).mangledname,0));
                     typvalue:=1;
                  end
                else
                  begin
                     { virtual method, write vmt offset }
                     current_asmdata.asmlists[al_rtti].concat(Tai_const.create(aitconst_ptr,
                       tprocdef(propaccesslist.procdef)._class.vmtmethodoffset(tprocdef(propaccesslist.procdef).extnumber)));
                     typvalue:=2;
                  end;
             end;
           proctypesinfo:=proctypesinfo or (typvalue shl shiftvalue);
        end;

      begin
        for i:=0 to st.SymList.Count-1 do
          begin
            sym:=tsym(st.SymList[i]);
            if (sym.typ=propertysym) and
               (sym.visibility=vis_published) then
              begin
                if ppo_indexed in tpropertysym(sym).propoptions then
                  proctypesinfo:=$40
                else
                  proctypesinfo:=0;
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_sym(ref_rtti(tpropertysym(sym).propdef,fullrtti)));
                writeaccessproc(palt_read,0,0);
                writeaccessproc(palt_write,2,0);
                { is it stored ? }
                if not(ppo_stored in tpropertysym(sym).propoptions) then
                  begin
                    { no, so put a constant zero }
                    current_asmdata.asmlists[al_rtti].concat(Tai_const.create(aitconst_ptr,0));
                    proctypesinfo:=proctypesinfo or (3 shl 4);
                  end
                else
                  writeaccessproc(palt_stored,4,1); { maybe; if no procedure put a constant 1 (=true) }
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(tpropertysym(sym).index));
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(tpropertysym(sym).default));
                propnameitem:=TPropNameListItem(propnamelist.Find(tpropertysym(sym).name));
                if not assigned(propnameitem) then
                  internalerror(200512201);
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_16bit(propnameitem.propindex));
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(proctypesinfo));
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(length(tpropertysym(sym).realname)));
                current_asmdata.asmlists[al_rtti].concat(Tai_string.Create(tpropertysym(sym).realname));
                if (tf_requires_proper_alignment in target_info.flags) then
                  current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
             end;
          end;
      end;


    procedure TRTTIWriter.write_rtti_data(def:tdef;rt:trttitype);

        procedure unknown_rtti(def:tstoreddef);
        begin
          current_asmdata.asmlists[al_rtti].concat(tai_const.create_8bit(tkUnknown));
          write_rtti_name(def);
        end;

        procedure variantdef_rtti(def:tvariantdef);
        begin
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkVariant));
        end;

        procedure stringdef_rtti(def:tstringdef);
        begin
          case def.stringtype of
            st_ansistring:
              begin
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkAString));
                 write_rtti_name(def);
              end;
            st_widestring:
              begin
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkWString));
                 write_rtti_name(def);
              end;
            st_unicodestring:
              begin
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkUString));
                 write_rtti_name(def);
              end;
            st_longstring:
              begin
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkLString));
                 write_rtti_name(def);
              end;
            st_shortstring:
              begin
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkSString));
                 write_rtti_name(def);
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(def.len));
                 if (tf_requires_proper_alignment in target_info.flags) then
                   current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
              end;
          end;
        end;

        procedure enumdef_rtti(def:tenumdef);
        var
           hp : tenumsym;
        begin
          current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkEnumeration));
          write_rtti_name(def);
          if (tf_requires_proper_alignment in target_info.flags) then
            current_asmdata.asmlists[al_rtti].concat(Cai_align.Create(sizeof(TConstPtrUInt)));
          case longint(def.size) of
            1 :
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(otUByte));
            2 :
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(otUWord));
            4 :
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(otULong));
          end;
          if (tf_requires_proper_alignment in target_info.flags) then
            current_asmdata.asmlists[al_rtti].concat(Cai_align.Create(longint(def.size)));
          current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(def.min));
          current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(def.max));
          if (tf_requires_proper_alignment in target_info.flags) then
            current_asmdata.asmlists[al_rtti].concat(Cai_align.Create(sizeof(TConstPtrUint)));
          if assigned(def.basedef) then
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_sym(ref_rtti(def.basedef,rt)))
          else
            current_asmdata.asmlists[al_rtti].concat(Tai_const.create_sym(nil));
          hp:=tenumsym(def.firstenum);
          while assigned(hp) do
            begin
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(length(hp.realname)));
              current_asmdata.asmlists[al_rtti].concat(Tai_string.Create(hp.realname));
              hp:=hp.nextenum;
            end;
          current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(0));
        end;

        procedure orddef_rtti(def:torddef);

          procedure dointeger;
          const
            trans : array[tordtype] of byte =
              (otUByte{otNone},
               otUByte,otUWord,otULong,otUByte{otNone},
               otSByte,otSWord,otSLong,otUByte{otNone},
               otUByte,otSByte,otSWord,otSLong,otSByte,
               otUByte,otUWord,otUByte);
          begin
            write_rtti_name(def);
            if (tf_requires_proper_alignment in target_info.flags) then
              current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(byte(trans[def.ordtype])));
            if (tf_requires_proper_alignment in target_info.flags) then
              current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
            {Convert to longint to smuggle values in high(longint)+1..high(cardinal) into asmlist.}
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(longint(def.low.svalue)));
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(longint(def.high.svalue)));
          end;

        begin
          case def.ordtype of
            s64bit :
              begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkInt64));
                write_rtti_name(def);
                if (tf_requires_proper_alignment in target_info.flags) then
                  current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
                { low }
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_64bit(def.low.svalue));
                { high }
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_64bit(def.high.svalue));
              end;
            u64bit :
              begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkQWord));
                write_rtti_name(def);
                if (tf_requires_proper_alignment in target_info.flags) then
                  current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
                {use svalue because Create_64bit accepts int64, prevents range checks}
                { low }
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_64bit(def.low.svalue));
                { high }
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_64bit(def.high.svalue));
              end;
            pasbool:
              begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkBool));
                dointeger;
              end;
            uchar:
              begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkChar));
                dointeger;
              end;
            uwidechar:
              begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkWChar));
                dointeger;
              end;
            scurrency:
              begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkFloat));
                write_rtti_name(def);
                if (tf_requires_proper_alignment in target_info.flags) then
                  current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(ftCurr));
              end;
            else
              begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkInteger));
                dointeger;
              end;
          end;
        end;


        procedure floatdef_rtti(def:tfloatdef);
        const
          {tfloattype = (s32real,s64real,s80real,s64bit,s128bit);}
          translate : array[tfloattype] of byte =
             (ftSingle,ftDouble,ftExtended,ftComp,ftCurr,ftFloat128);
        begin
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkFloat));
           write_rtti_name(def);
           if (tf_requires_proper_alignment in target_info.flags) then
             current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(translate[def.floattype]));
        end;


        procedure setdef_rtti(def:tsetdef);
        begin
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkSet));
           write_rtti_name(def);
           if (tf_requires_proper_alignment in target_info.flags) then
             current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
           case def.size of
             1:
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(otUByte));
             2:
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(otUWord));
             4:
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(otULong));
             else
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(otUByte));
           end;
           if (tf_requires_proper_alignment in target_info.flags) then
             current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_sym(ref_rtti(def.elementdef,rt)));
        end;


        procedure arraydef_rtti(def:tarraydef);
        begin
           if ado_IsDynamicArray in def.arrayoptions then
             current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkdynarray))
           else
             current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkarray));
           write_rtti_name(def);
           if (tf_requires_proper_alignment in target_info.flags) then
             current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
           { size of elements }
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_pint(def.elesize));

           if not(ado_IsDynamicArray in def.arrayoptions) then
             begin
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_pint(pint(def.elecount)));
               { element type }
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_sym(ref_rtti(def.elementdef,rt)));
             end
           else
             { write a delphi almost compatible dyn. array entry:
               there are two types, eltype and eltype2, the latter is nil if the element type needs
               no finalization, the former is always valid, delphi has this swapped, but for
               compatibility with older fpc versions we do it different, to be delphi compatible,
               the names are swapped in typinfo.pp
             }
             begin
               { element type }
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_sym(ref_rtti(def.elementdef,rt)));
             end;
           { variant type }
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(tstoreddef(def.elementdef).getvardef));
           if ado_IsDynamicArray in def.arrayoptions then
             begin
               { element type }
               if def.elementdef.needs_inittable then
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_sym(ref_rtti(def.elementdef,rt)))
               else
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_pint(0));
               { dummy DynUnitName }
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(0));
             end;
        end;

        procedure recorddef_rtti(def:trecorddef);
        var
          fieldcnt : longint;
        begin
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkrecord));
           write_rtti_name(def);
           if (tf_requires_proper_alignment in target_info.flags) then
             current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(def.size));
           fieldcnt:=fields_count(def.symtable,rt);
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(fieldcnt));
           fields_write_rtti_data(def.symtable,rt);
        end;


        procedure procvardef_rtti(def:tprocvardef);

           procedure write_para(parasym:tparavarsym);
           var
             paraspec : byte;
           begin
             { only store user visible parameters }
             if not(vo_is_hidden_para in parasym.varoptions) then
               begin
                 case parasym.varspez of
                   vs_value: paraspec := 0;
                   vs_const: paraspec := pfConst;
                   vs_var  : paraspec := pfVar;
                   vs_out  : paraspec := pfOut;
                 end;
                 { Kylix also seems to always add both pfArray and pfReference
                   in this case
                 }
                 if is_open_array(parasym.vardef) then
                   paraspec:=paraspec or pfArray or pfReference;
                 { and these for classes and interfaces (maybe because they
                   are themselves addresses?)
                 }
                 if is_class_or_interface(parasym.vardef) then
                   paraspec:=paraspec or pfAddress;
                 { set bits run from the highest to the lowest bit on
                   big endian systems
                 }
                 if (target_info.endian = endian_big) then
                   paraspec:=reverse_byte(paraspec);
                 { write flags for current parameter }
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(paraspec));
                 { write name of current parameter }
                 current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(length(parasym.realname)));
                 current_asmdata.asmlists[al_rtti].concat(Tai_string.Create(parasym.realname));
                 { write name of type of current parameter }
                 write_rtti_name(parasym.vardef);
               end;
           end;

        var
          methodkind : byte;
          i : integer;
        begin
          if po_methodpointer in def.procoptions then
            begin
               { write method id and name }
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkmethod));
               write_rtti_name(def);
               if (tf_requires_proper_alignment in target_info.flags) then
                 current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));

               { write kind of method (can only be function or procedure)}
               if def.returndef = voidtype then
                 methodkind := mkProcedure
               else
                 methodkind := mkFunction;
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(methodkind));

               { write parameter info. The parameters must be written in reverse order
                 if this method uses right to left parameter pushing! }
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(def.maxparacount));
{$ifdef i386}
               if def.proccalloption in pushleftright_pocalls then
                 begin
                   for i:=0 to def.paras.count-1 do
                     write_para(tparavarsym(def.paras[i]));
                 end
               else
{$endif}
                 begin
                   for i:=def.paras.count-1 downto 0 do
                     write_para(tparavarsym(def.paras[i]));
                 end;

               { write name of result type }
               write_rtti_name(def.returndef);
            end
          else
            begin
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkprocvar));
              write_rtti_name(def);
            end;
        end;


        procedure objectdef_rtti(def:tobjectdef);

          procedure objectdef_rtti_class_init(def:tobjectdef);
          begin
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(def.size));
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(fields_count(def.symtable,rt)));
            fields_write_rtti_data(def.symtable,rt);
          end;

          procedure objectdef_rtti_interface_init(def:tobjectdef);
          begin
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(def.size));
          end;

          procedure objectdef_rtti_class_full(def:tobjectdef);
          var
            propnamelist : TFPHashObjectList;
          begin
            { Collect unique property names with nameindex }
            propnamelist:=TFPHashObjectList.Create;
            collect_propnamelist(propnamelist,def);

            if (oo_has_vmt in def.objectoptions) then
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Createname(def.vmt_mangledname,0))
            else
              current_asmdata.asmlists[al_rtti].concat(Tai_const.create_sym(nil));

            { write parent typeinfo }
            if assigned(def.childof) and
               (oo_can_have_published in def.childof.objectoptions) then
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_sym(ref_rtti(def.childof,fullrtti)))
            else
              current_asmdata.asmlists[al_rtti].concat(Tai_const.create_sym(nil));

            { total number of unique properties }
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_16bit(propnamelist.count));

            { write unit name }
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(length(current_module.realmodulename^)));
            current_asmdata.asmlists[al_rtti].concat(Tai_string.Create(current_module.realmodulename^));
            if (tf_requires_proper_alignment in target_info.flags) then
              current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));

            { write published properties for this object }
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_16bit(published_properties_count(def.symtable)));
            if (tf_requires_proper_alignment in target_info.flags) then
              current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
            published_properties_write_rtti_data(propnamelist,def.symtable);

            propnamelist.free;
          end;

          procedure objectdef_rtti_interface_full(def:tobjectdef);
          var
            i : longint;
            propnamelist : TFPHashObjectList;
            { if changed to a set, make sure it's still a byte large, and
              swap appropriately when cross-compiling
            }
            IntfFlags: byte;
          begin
            { Collect unique property names with nameindex }
            propnamelist:=TFPHashObjectList.Create;
            collect_propnamelist(propnamelist,def);

            { write parent typeinfo }
            if assigned(def.childof) then
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_sym(ref_rtti(def.childof,fullrtti)))
            else
              current_asmdata.asmlists[al_rtti].concat(Tai_const.create_sym(nil));

            { interface: write flags, iid and iidstr }
            IntfFlags:=0;
            if assigned(def.iidguid) then
              IntfFlags:=IntfFlags or (1 shl ord(ifHasGuid));
            if assigned(def.iidstr) then
              IntfFlags:=IntfFlags or (1 shl ord(ifHasStrGUID));
            if (def.objecttype=odt_dispinterface) then
              IntfFlags:=IntfFlags or (1 shl ord(ifDispInterface));
            if (target_info.endian=endian_big) then
              IntfFlags:=reverse_byte(IntfFlags);
              {
              ifDispatch, }
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(IntfFlags));
            if (tf_requires_proper_alignment in target_info.flags) then
              current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_32bit(longint(def.iidguid^.D1)));
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_16bit(def.iidguid^.D2));
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_16bit(def.iidguid^.D3));
            for i:=Low(def.iidguid^.D4) to High(def.iidguid^.D4) do
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(def.iidguid^.D4[i]));

            { write unit name }
            current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(length(current_module.realmodulename^)));
            current_asmdata.asmlists[al_rtti].concat(Tai_string.Create(current_module.realmodulename^));
            if (tf_requires_proper_alignment in target_info.flags) then
              current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));

            { write iidstr }
            if assigned(def.iidstr) then
              begin
                current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(length(def.iidstr^)));
                current_asmdata.asmlists[al_rtti].concat(Tai_string.Create(def.iidstr^));
              end
            else
              current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(0));
            if (tf_requires_proper_alignment in target_info.flags) then
              current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));

            { write published properties for this object }
            published_properties_write_rtti_data(propnamelist,def.symtable);

            propnamelist.free;
          end;

        begin
           case def.objecttype of
             odt_class:
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkclass));
             odt_object:
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkobject));
             odt_dispinterface,
             odt_interfacecom:
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkinterface));
             odt_interfacecorba:
               current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(tkinterfaceCorba));
             else
               internalerror(200611034);
           end;

           { generate the name }
           current_asmdata.asmlists[al_rtti].concat(Tai_const.Create_8bit(length(def.objrealname^)));
           current_asmdata.asmlists[al_rtti].concat(Tai_string.Create(def.objrealname^));
           if (tf_requires_proper_alignment in target_info.flags) then
             current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));

           case rt of
             initrtti :
               begin
                 if def.objecttype in [odt_class,odt_object] then
                   objectdef_rtti_class_init(def)
                 else
                   objectdef_rtti_interface_init(def);
               end;
             fullrtti :
               begin
                 if def.objecttype in [odt_class,odt_object] then
                   objectdef_rtti_class_full(def)
                 else
                   objectdef_rtti_interface_full(def);
               end;
           end;
        end;

      begin
        case def.typ of
          variantdef :
            variantdef_rtti(tvariantdef(def));
          stringdef :
            stringdef_rtti(tstringdef(def));
          enumdef :
            enumdef_rtti(tenumdef(def));
          orddef :
            orddef_rtti(torddef(def));
          floatdef :
            floatdef_rtti(tfloatdef(def));
          setdef :
            setdef_rtti(tsetdef(def));
          procvardef :
            procvardef_rtti(tprocvardef(def));
          arraydef :
            begin
              if ado_IsBitPacked in tarraydef(def).arrayoptions then
                unknown_rtti(tstoreddef(def))
              else
                arraydef_rtti(tarraydef(def));
            end;
          recorddef :
            begin
              if trecorddef(def).is_packed then
                unknown_rtti(tstoreddef(def))
              else
                recorddef_rtti(trecorddef(def));
            end;
          objectdef :
            objectdef_rtti(tobjectdef(def));
          else
            unknown_rtti(tstoreddef(def));
        end;
      end;

    procedure TRTTIWriter.write_rtti_extrasyms(def:Tdef;rt:Trttitype;mainrtti:Tasmsymbol);

        procedure enumdef_rtti_ord2stringindex(def:Tenumdef);

        var rttilab:Tasmsymbol;
            t:Tenumsym;
            syms:^Tenumsym;
            offsets:^longint;
            sym_count,sym_alloc:longint;
            h,i,p,o,st:longint;
            mode:(lookup,search); {Modify with care, ordinal value of enum is written.}
            r:single;             {Must be real type because of integer overflow risk.}

        begin
          {Random access needed, put in array.}
          getmem(syms,64*sizeof(Tenumsym));
          getmem(offsets,64*sizeof(longint));
          sym_count:=0;
          sym_alloc:=64;
          st:=0;
          t:=Tenumsym(def.firstenum);
          while assigned(t) do
            begin
              if sym_count>=sym_alloc then
                begin
                  reallocmem(syms,2*sym_alloc*sizeof(Tenumsym));
                  reallocmem(offsets,2*sym_alloc*sizeof(longint));
                  sym_alloc:=sym_alloc*2;
                end;
              syms[sym_count]:=t;
              offsets[sym_count]:=st;
              inc(sym_count);
              st:=st+length(t.realname)+1;
              t:=t.nextenum;
            end;
          {Sort the syms by enum value}
          if sym_count>=2 then
            begin
              p:=1;
              while 2*p<sym_count do
                p:=2*p;
              while p<>0 do
                begin
                  for h:=p to sym_count-1 do
                    begin
                      i:=h;
                      t:=syms[i];
                      o:=offsets[i];
                      repeat
                        if syms[i-p].value<=t.value then
                          break;
                        syms[i]:=syms[i-p];
                        offsets[i]:=offsets[i-p];
                        dec(i,p);
                      until i<p;
                      syms[i]:=t;
                      offsets[i]:=o;
                    end;
                  p:=p shr 1;
                end;
            end;
          {Decide wether a lookup array is size efficient.}
          mode:=lookup;
          if sym_count>0 then
            begin
              i:=1;
              r:=0;
              h:=syms[0].value; {Next expected enum value is min.}
              while i<sym_count do
                begin
                  {Calculate size of hole between values. Avoid integer overflows.}
                  r:=r+(single(syms[i].value)-single(h))-1;
                  h:=syms[i].value;
                  inc(i);
                end;
              if r>sym_count then
                mode:=search; {Don't waste more than 50% space.}
            end;
          {Calculate start of string table.}
          st:=1;
          if assigned(def.typesym) then
            inc(st,length(def.typesym.realname)+1)
          else
            inc(st);
          if (tf_requires_proper_alignment in target_info.flags) then
            st:=align(st,sizeof(Tconstptruint));
          inc(st);
          if (tf_requires_proper_alignment in target_info.flags) then
            st:=align(st,sizeof(Tconstptruint));
          inc(st,8+sizeof(pint));
          { write rtti data }
          with current_asmdata do
            begin
              rttilab:=defineasmsymbol(Tstoreddef(def).rtti_mangledname(rt)+'_o2s',AB_GLOBAL,AT_DATA);
              maybe_new_object_file(asmlists[al_rtti]);
              new_section(asmlists[al_rtti],sec_rodata,rttilab.name,const_align(sizeof(pint)));
              asmlists[al_rtti].concat(Tai_symbol.create_global(rttilab,0));
              asmlists[al_rtti].concat(Tai_const.create_32bit(longint(mode)));
              if mode=lookup then
                begin
                  if (tf_requires_proper_alignment in target_info.flags) then
                    current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));
                  o:=syms[0].value;  {Start with min value.}
                  for i:=0 to sym_count-1 do
                    begin
                      while o<syms[i].value do
                        begin
                          asmlists[al_rtti].concat(Tai_const.create_pint(0));
                          inc(o);
                        end;
                      inc(o);
                      asmlists[al_rtti].concat(Tai_const.create_sym_offset(mainrtti,st+offsets[i]));
                    end;
                end
              else
                begin
                  asmlists[al_rtti].concat(Tai_const.create_32bit(sym_count));
                  for i:=0 to sym_count-1 do
                    begin
                      if (tf_requires_proper_alignment in target_info.flags) then
                        current_asmdata.asmlists[al_rtti].concat(cai_align.Create(4));
                      asmlists[al_rtti].concat(Tai_const.create_32bit(syms[i].value));
                      if (tf_requires_proper_alignment in target_info.flags) then
                        current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));	
                      asmlists[al_rtti].concat(Tai_const.create_sym_offset(mainrtti,st+offsets[i]));
                    end;
                end;
              asmlists[al_rtti].concat(Tai_symbol_end.create(rttilab));
            end;
          freemem(syms);
          freemem(offsets);
        end;

        procedure enumdef_rtti_string2ordindex(def:Tenumdef);

        var rttilab:Tasmsymbol;
            t:Tenumsym;
            syms:^Tenumsym;
            offsets:^longint;
            sym_count,sym_alloc:longint;
            h,i,p,o,st:longint;

        begin
          {Random access needed, put in array.}
          getmem(syms,64*sizeof(Tenumsym));
          getmem(offsets,64*sizeof(longint));
          sym_count:=0;
          sym_alloc:=64;
          st:=0;
          t:=Tenumsym(def.firstenum);
          while assigned(t) do
            begin
              if sym_count>=sym_alloc then
                begin
                  reallocmem(syms,2*sym_alloc*sizeof(Tenumsym));
                  reallocmem(offsets,2*sym_alloc*sizeof(longint));
                  sym_alloc:=sym_alloc*2;
                end;
              syms[sym_count]:=t;
              offsets[sym_count]:=st;
              inc(sym_count);
              st:=st+length(t.realname)+1;
              t:=t.nextenum;
            end;
          {Sort the syms by enum name}
          if sym_count>=2 then
            begin
              p:=1;
              while 2*p<sym_count do
                p:=2*p;
              while p<>0 do
                begin
                  for h:=p to sym_count-1 do
                    begin
                      i:=h;
                      t:=syms[i];
                      o:=offsets[i];
                      repeat
                        if syms[i-p].name<=t.name then
                          break;
                        syms[i]:=syms[i-p];
                        offsets[i]:=offsets[i-p];
                        dec(i,p);
                      until i<p;
                      syms[i]:=t;
                      offsets[i]:=o;
                    end;
                  p:=p shr 1;
                end;
            end;
          {Calculate start of string table.}
          st:=1;
          if assigned(def.typesym) then
            inc(st,length(def.typesym.realname)+1)
          else
            inc(st);
          if (tf_requires_proper_alignment in target_info.flags) then
            st:=align(st,sizeof(Tconstptruint));
          inc(st);
          if (tf_requires_proper_alignment in target_info.flags) then
            st:=align(st,sizeof(Tconstptruint));
          inc(st,8+sizeof(pint));
          { write rtti data }
          with current_asmdata do
            begin
              rttilab:=defineasmsymbol(Tstoreddef(def).rtti_mangledname(rt)+'_s2o',AB_GLOBAL,AT_DATA);
              maybe_new_object_file(asmlists[al_rtti]);
              new_section(asmlists[al_rtti],sec_rodata,rttilab.name,const_align(sizeof(pint)));
              asmlists[al_rtti].concat(Tai_symbol.create_global(rttilab,0));
              asmlists[al_rtti].concat(Tai_const.create_32bit(sym_count));
              for i:=0 to sym_count-1 do
                begin
                  if (tf_requires_proper_alignment in target_info.flags) then
                    current_asmdata.asmlists[al_rtti].concat(cai_align.Create(4));
                  asmlists[al_rtti].concat(Tai_const.create_32bit(syms[i].value));
                  if (tf_requires_proper_alignment in target_info.flags) then
                    current_asmdata.asmlists[al_rtti].concat(cai_align.Create(sizeof(TConstPtrUInt)));	
                  asmlists[al_rtti].concat(Tai_const.create_sym_offset(mainrtti,st+offsets[i]));
                end;
              asmlists[al_rtti].concat(Tai_symbol_end.create(rttilab));
            end;
          freemem(syms);
          freemem(offsets);
        end;

    begin
      case def.typ of
        enumdef:
          if rt=fullrtti then
            begin
              enumdef_rtti_ord2stringindex(Tenumdef(def));
              enumdef_rtti_string2ordindex(Tenumdef(def));
            end;
      end;
    end;

    procedure TRTTIWriter.write_child_rtti_data(def:tdef;rt:trttitype);
      begin
        case def.typ of
          enumdef :
            if assigned(tenumdef(def).basedef) then
              write_rtti(tenumdef(def).basedef,rt);
          setdef :
            write_rtti(tsetdef(def).elementdef,rt);
          arraydef :
            write_rtti(tarraydef(def).elementdef,rt);
          recorddef :
            fields_write_rtti(trecorddef(def).symtable,rt);
          objectdef :
            begin
              if assigned(tobjectdef(def).childof) then
                write_rtti(tobjectdef(def).childof,rt);
              if rt=initrtti then
                fields_write_rtti(tobjectdef(def).symtable,rt)
              else
                published_write_rtti(tobjectdef(def).symtable,rt);
            end;
        end;
      end;


    function TRTTIWriter.ref_rtti(def:tdef;rt:trttitype):tasmsymbol;
      begin
        result:=current_asmdata.RefAsmSymbol(def.rtti_mangledname(rt));
      end;


    procedure TRTTIWriter.write_rtti(def:tdef;rt:trttitype);
      var
        rttilab : tasmsymbol;
      begin
        { only write rtti of definitions from the current module }
        if not findunitsymtable(def.owner).iscurrentunit then
          exit;
        { prevent recursion }
        if rttidefstate[rt] in def.defstates then
          exit;
        include(def.defstates,rttidefstate[rt]);
        { write first all dependencies }
        write_child_rtti_data(def,rt);
        { write rtti data }
        rttilab:=current_asmdata.DefineAsmSymbol(tstoreddef(def).rtti_mangledname(rt),AB_GLOBAL,AT_DATA);
        maybe_new_object_file(current_asmdata.asmlists[al_rtti]);
        new_section(current_asmdata.asmlists[al_rtti],sec_rodata,rttilab.name,const_align(sizeof(pint)));
        current_asmdata.asmlists[al_rtti].concat(Tai_symbol.Create_global(rttilab,0));
        write_rtti_data(def,rt);
        current_asmdata.asmlists[al_rtti].concat(Tai_symbol_end.Create(rttilab));
        write_rtti_extrasyms(def,rt,rttilab);
      end;


    function TRTTIWriter.get_rtti_label(def:tdef;rt:trttitype):tasmsymbol;
      begin
        result:=current_asmdata.RefAsmSymbol(def.rtti_mangledname(rt));
      end;

    function TRTTIWriter.get_rtti_label_ord2str(def:tdef;rt:trttitype):tasmsymbol;
      begin
        result:=current_asmdata.RefAsmSymbol(def.rtti_mangledname(rt)+'_o2s');
      end;

    function TRTTIWriter.get_rtti_label_str2ord(def:tdef;rt:trttitype):tasmsymbol;
      begin
        result:=current_asmdata.RefAsmSymbol(def.rtti_mangledname(rt)+'_s2o');
      end;

end.