freepascal.compiler/compiler/symtable.pas

{
    $Id$
    Copyright (c) 1993-98 by Florian Klaempfl, Pierre Muller

    This unit handles the symbol tables

    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.
 ****************************************************************************
}
{$ifdef TP}
  {$N+,E+,F+,D-}
{$endif}
unit symtable;

  interface

    uses
{$ifdef TP}
{$ifndef Delphi}
       objects,
{$endif Delphi}
{$endif}
       strings,cobjects,
       globtype,globals,tokens,systems,verbose,
       symconst,
       aasm
       ,cpubase
       ,cpuinfo
{$ifdef GDB}
       ,gdb
{$endif}
       ;

{************************************************
           Some internal constants
************************************************}

   const
       hasharraysize    = 256;
  {$ifdef TP}
       indexgrowsize    = 16;
  {$else}
       indexgrowsize    = 64;
  {$endif}


{************************************************
            Needed forward pointers
************************************************}

    type
       { needed for owner (table) of symbol }
       psymtable     = ^tsymtable;
       punitsymtable = ^tunitsymtable;

       { needed for names by the definitions }
       ptypesym = ^ttypesym;
       penumsym = ^tenumsym;
       pprocsym = ^tprocsym;

       pref = ^tref;
       tref = object
         nextref     : pref;
         posinfo     : tfileposinfo;
         moduleindex : word;
         is_written  : boolean;
         constructor init(ref:pref;pos:pfileposinfo);
         destructor  done; virtual;
       end;

      { Deref entry options }
      tdereftype = (derefnil,derefaktrecordindex,derefaktstaticindex,
                    derefunit,derefrecord,derefindex,
                    dereflocal,derefpara,derefaktlocal);

      pderef = ^tderef;
      tderef = object
        dereftype : tdereftype;
        index     : word;
        next      : pderef;
        constructor init(typ:tdereftype;i:word);
        destructor  done;
      end;

      psymtableentry = ^tsymtableentry;
      tsymtableentry = object(tnamedindexobject)
        owner      : psymtable;
      end;

{************************************************
                    TDef
************************************************}

{$i symdefh.inc}

{************************************************
                   TSym
************************************************}

{$i symsymh.inc}

{************************************************
                 TSymtable
************************************************}

       tsymtabletype = (invalidsymtable,withsymtable,staticsymtable,
                        globalsymtable,unitsymtable,
                        objectsymtable,recordsymtable,
                        macrosymtable,localsymtable,
                        parasymtable,inlineparasymtable,
                        inlinelocalsymtable,stt_exceptsymtable,
                        { only used for PPU reading of static part
                          of a unit }
                        staticppusymtable);

       tcallback = procedure(p : psym);

       tsearchhasharray = array[0..hasharraysize-1] of psym;
       psearchhasharray = ^tsearchhasharray;

       tsymtable = object
          symtabletype : tsymtabletype;
          { each symtable gets a number }
          unitid    : word{integer give range check errors PM};
          name      : pstring;
          datasize  : longint;
          dataalignment : longint;
          symindex,
          defindex  : pindexarray;
          symsearch : pdictionary;
          next      : psymtable;
          defowner  : pdef; { for records and objects }
          { alignment used in this symtable }
          alignment : longint;
          { only used for parameter symtable to determine the offset relative }
          { to the frame pointer and for local inline }
          address_fixup : longint;
          { this saves all definition to allow a proper clean up }
          { separate lexlevel from symtable type }
          symtablelevel : byte;
          constructor init(t : tsymtabletype);
          destructor  done;virtual;
          { access }
          function getdefnr(l : longint) : pdef;
          function getsymnr(l : longint) : psym;
          { load/write }
          constructor load;
          procedure write;
          constructor loadas(typ : tsymtabletype);
          procedure writeas;
          procedure loaddefs;
          procedure loadsyms;
          procedure writedefs;
          procedure writesyms;
          procedure deref;
          procedure clear;
          function  rename(const olds,news : stringid):psym;
          procedure foreach(proc2call : tnamedindexcallback);
          function  insert(sym : psym):psym;
          function  search(const s : stringid) : psym;
          function  speedsearch(const s : stringid;speedvalue : longint) : psym;
          procedure registerdef(p : pdef);
          procedure allsymbolsused;
          procedure allunitsused;
          procedure check_forwards;
          procedure checklabels;
          { change alignment for args  only parasymtable }
          procedure set_alignment(_alignment : byte);
          { find arg having offset  only parasymtable }
          function  find_at_offset(l : longint) : pvarsym;
{$ifdef CHAINPROCSYMS}
          procedure chainprocsyms;
{$endif CHAINPROCSYMS}
          procedure load_browser;
          procedure write_browser;
{$ifdef BrowserLog}
          procedure writebrowserlog;
{$endif BrowserLog}
{$ifdef GDB}
          procedure concatstabto(asmlist : paasmoutput);virtual;
{$endif GDB}
          function getnewtypecount : word; virtual;
       end;

       tunitsymtable = object(tsymtable)
          unittypecount  : word;
          unitsym       : punitsym;
{$ifdef GDB}
          dbx_count : longint;
          prev_dbx_counter : plongint;
          dbx_count_ok : boolean;
          is_stab_written : boolean;
{$endif GDB}
          constructor init(t : tsymtabletype;const n : string);
          constructor loadasunit;
          destructor done;virtual;
          procedure writeasunit;
{$ifdef GDB}
          procedure concattypestabto(asmlist : paasmoutput);
{$endif GDB}
          procedure load_symtable_refs;
          function getnewtypecount : word; virtual;
       end;

       pwithsymtable = ^twithsymtable;
       twithsymtable = object(tsymtable)
          { used for withsymtable for allowing constructors }
          direct_with : boolean;
          { in fact it is a ptree }
          withnode : pointer;
          { ptree to load of direct with var }
          { already usable before firstwith
            needed for firstpass of function parameters PM }
          withrefnode : pointer;
          constructor init;
          destructor  done;virtual;
        end;

{****************************************************************************
                              Var / Consts
****************************************************************************}

    const
       systemunit           : punitsymtable = nil; { pointer to the system unit }
       current_object_option : tsymoptions = [sp_public];

    var
       { for STAB debugging }
       globaltypecount  : word;
       pglobaltypecount : pword;

       registerdef : boolean;      { true, when defs should be registered }

       defaultsymtablestack,       { symtablestack after default units
                                     have been loaded }
       symtablestack : psymtable;  { linked list of symtables }

       srsym : psym;           { result of the last search }
       srsymtable : psymtable;
       lastsrsym : psym;           { last sym found in statement }
       lastsrsymtable : psymtable;
       lastsymknown : boolean;

       constsymtable : psymtable;  { symtable were the constants can be
                                     inserted }

       voidpointerdef : ppointerdef; { pointer for Void-Pointerdef      }
       charpointerdef : ppointerdef; { pointer for Char-Pointerdef      }
       voidfarpointerdef : ppointerdef;

       cformaldef : pformaldef;    { unique formal definition     }
       voiddef   : porddef;     { Pointer to Void (procedure)       }
       cchardef  : porddef;     { Pointer to Char                  }
       booldef   : porddef;     { pointer to boolean type          }
       u8bitdef  : porddef;     { Pointer to 8-Bit unsigned      }
       u16bitdef : porddef;     { Pointer to 16-Bit unsigned    }
       u32bitdef : porddef;     { Pointer to 32-Bit unsigned    }
       s32bitdef : porddef;     { Pointer to 32-Bit signed        }

       cu64bitdef : porddef;       { pointer to 64 bit unsigned def }
       cs64bitdef : porddef;    { pointer to 64 bit signed def, }
                                   { calculated by the int unit on i386 }

       s32floatdef : pfloatdef;    { pointer for realconstn         }
       s64floatdef : pfloatdef;    { pointer for realconstn         }
       s80floatdef : pfloatdef;    { pointer to type of temp. floats   }
       s32fixeddef : pfloatdef;    { pointer to type of temp. fixed    }

       cshortstringdef : pstringdef;  { pointer to type of short string const   }
       clongstringdef  : pstringdef;  { pointer to type of long string const   }
       cansistringdef  : pstringdef;  { pointer to type of ansi string const  }
       cwidestringdef  : pstringdef;  { pointer to type of wide string const  }
       openshortstringdef : pstringdef;  { pointer to type of an open shortstring,
                                            needed for readln() }
       openchararraydef : parraydef;     { pointer to type of an open array of char,
                                            needed for readln() }

       cfiledef : pfiledef;       { get the same definition for all file }
                                  { uses for stabs }

       firstglobaldef,   { linked list of all globals defs }
       lastglobaldef : pdef;   { used to reset stabs/ranges }

       class_tobject : pobjectdef; { pointer to the anchestor of all   }
                                   { clases                         }
       pvmtdef     : ppointerdef;  { type of classrefs }

       aktprocsym : pprocsym;      { pointer to the symbol for the
                                     currently be parsed procedure }

       aktcallprocsym : pprocsym;  { pointer to the symbol for the
                                     currently be called procedure,
                                     only set/unset in firstcall }

       aktvarsym : pvarsym;     { pointer to the symbol for the
                                     currently read var, only used
                                     for variable directives }

       procprefix : string;     { eindeutige Namen bei geschachtel- }
                                   { ten Unterprogrammen erzeugen      }

       lexlevel : longint;       { level of code                     }
                                   { 1 for main procedure             }
                                   { 2 for normal function or proc     }
                                   { higher for locals           }
    const
       main_program_level = 1;
       unit_init_level = 1;
       normal_function_level = 2;
       in_loading : boolean = false;

{$ifdef i386}
       bestrealdef : ^pfloatdef = @s80floatdef;
{$endif}
{$ifdef m68k}
       bestrealdef : ^pfloatdef = @s64floatdef;
{$endif}
{$ifdef alpha}
       bestrealdef : ^pfloatdef = @s64floatdef;
{$endif}
{$ifdef powerpc}
       bestrealdef : ^pfloatdef = @s64floatdef;
{$endif}

    var

       macros : psymtable;       { pointer for die Symboltabelle mit  }
                                   { Makros                         }

       read_member : boolean;      { true, wenn Members aus einer PPU-  }
                                   { Datei gelesen werden, d.h. ein     }
                                   { varsym seine Adresse einlesen soll }

       generrorsym : psym;       { Jokersymbol, wenn das richtige    }
                                   { Symbol nicht gefunden wird }

       generrordef : pdef;       { Jokersymbol for eine fehlerhafte  }
                                   { Typdefinition                   }

       aktobjectdef : pobjectdef;  { used for private functions check !! }

    const
       { last operator which can be overloaded }
       first_overloaded = _PLUS;
       last_overloaded  = _ASSIGNMENT;
    var
       overloaded_operators : array[first_overloaded..last_overloaded] of pprocsym;
       { unequal is not equal}
    const
       overloaded_names : array [first_overloaded..last_overloaded] of string[16] =
         ('plus','minus','star','slash','equal',
          'greater','lower','greater_or_equal',
          'lower_or_equal','as','is','in','sym_diff',
          'starstar','assign');

{$ifdef UNITALIASES}
    type
       punit_alias = ^tunit_alias;
       tunit_alias = object(tnamedindexobject)
          newname : pstring;
          constructor init(const n:string);
          destructor  done;virtual;
       end;
    var
       unitaliases : pdictionary;

    procedure addunitalias(const n:string);
    function getunitalias(const n:string):string;
{$endif UNITALIASES}


{****************************************************************************
                             Functions
****************************************************************************}

{*** Misc ***}
    function  globaldef(const s : string) : pdef;
    function  findunitsymtable(st:psymtable):psymtable;
    procedure duplicatesym(sym:psym);

{*** Search ***}
    function  search_a_symtable(const symbol:string;symtabletype:tsymtabletype):Psym;
    procedure getsym(const s : stringid;notfounderror : boolean);
    procedure getsymonlyin(p : psymtable;const s : stringid);

{*** PPU Write/Loading ***}
    procedure writeunitas(const s : string;unittable : punitsymtable;only_crc : boolean);
    procedure closecurrentppu;
    procedure numberunits;
    procedure load_interface;

{*** GDB ***}
{$ifdef GDB}
    function  typeglobalnumber(const s : string) : string;
{$endif}

{*** Definition ***}
   procedure reset_global_defs;

{*** Object Helpers ***}
    function search_class_member(pd : pobjectdef;const n : string) : psym;
    function search_default_property(pd : pobjectdef) : ppropertysym;

{*** Macro ***}
    procedure def_macro(const s : string);
    procedure set_macro(const s : string;value : string);

{*** symtable stack ***}
    procedure dellexlevel;
{$ifdef DEBUG}
    procedure test_symtablestack;
    procedure list_symtablestack;
{$endif DEBUG}

{*** Init / Done ***}
    procedure InitSymtable;
    procedure DoneSymtable;


implementation

  uses
     version,
     types,ppu,
     gendef,files
     ,tree
     ,cresstr
{$ifdef newcg}
     ,cgbase
{$else}
     ,hcodegen
{$endif}
{$ifdef BrowserLog}
     ,browlog
{$endif BrowserLog}
     ;

  var
     aktrecordsymtable : psymtable; { current record read from ppu symtable }
     aktstaticsymtable : psymtable; { current static for local ppu symtable }
     aktlocalsymtable  : psymtable; { current proc local for local ppu symtable }
{$ifdef GDB}
     asmoutput : paasmoutput;
{$endif GDB}
{$ifdef TP}
{$ifndef Delphi}
   {$ifndef dpmi}
       symbolstream : temsstream;  { stream which is used to store some info }
   {$else}
       symbolstream : tmemorystream;
   {$endif}
{$endif Delphi}
{$endif}

   {to dispose the global symtable of a unit }
  const
     dispose_global : boolean = false;
     memsizeinc = 2048; { for long stabstrings }
     tagtypes : Set of tdeftype =
       [recorddef,enumdef,
       {$IfNDef GDBKnowsStrings}
       stringdef,
       {$EndIf not GDBKnowsStrings}
       {$IfNDef GDBKnowsFiles}
       filedef,
       {$EndIf not GDBKnowsFiles}
       objectdef];

{*****************************************************************************
                             Helper Routines
*****************************************************************************}

{$ifdef unused}
    function demangledparas(s : string) : string;
      var
         r : string;
         l : longint;
      begin
         demangledparas:='';
         r:=',';
         { delete leading $$'s }
         l:=pos('$$',s);
         while l<>0 do
           begin
              delete(s,1,l+1);
              l:=pos('$$',s);
           end;
         { delete leading _$'s }
         l:=pos('_$',s);
         while l<>0 do
           begin
              delete(s,1,l+1);
              l:=pos('_$',s);
           end;
         l:=pos('$',s);
         if l=0 then
           exit;
         delete(s,1,l);
         while s<>'' do
          begin
            l:=pos('$',s);
            if l=0 then
             l:=length(s)+1;
            r:=r+copy(s,1,l-1)+',';
            delete(s,1,l);
          end;
         delete(r,1,1);
         delete(r,length(r),1);
         demangledparas:=r;
      end;
{$endif}


    procedure numberunits;
      var
        counter : longint;
        hp      : pused_unit;
        hp1     : pmodule;
      begin
        { Reset all numbers to -1 }
        hp1:=pmodule(loaded_units.first);
        while assigned(hp1) do
         begin
           if assigned(hp1^.globalsymtable) then
             psymtable(hp1^.globalsymtable)^.unitid:=$ffff;
           hp1:=pmodule(hp1^.next);
         end;
        { Our own symtable gets unitid 0, for a program there is
          no globalsymtable }
        if assigned(current_module^.globalsymtable) then
          psymtable(current_module^.globalsymtable)^.unitid:=0;
        { number units }
        counter:=1;
        hp:=pused_unit(current_module^.used_units.first);
        while assigned(hp) do
         begin
           psymtable(hp^.u^.globalsymtable)^.unitid:=counter;
           inc(counter);
           hp:=pused_unit(hp^.next);
         end;
      end;


    function findunitsymtable(st:psymtable):psymtable;
      begin
        findunitsymtable:=nil;
        repeat
          if not assigned(st) then
           internalerror(5566561);
          case st^.symtabletype of
            localsymtable,
            parasymtable,
            staticsymtable :
              break;
            globalsymtable,
            unitsymtable :
              begin
                findunitsymtable:=st;
                break;
              end;
            objectsymtable,
            recordsymtable :
              st:=st^.defowner^.owner;
            else
              internalerror(5566562);
          end;
        until false;
      end;


   procedure setstring(var p : pchar;const s : string);
     begin
{$ifndef Delphi}
{$ifdef TP}

       if use_big then
        begin
          p:=pchar(symbolstream.getsize);
          symbolstream.seek(longint(p));
          symbolstream.writestr(@s);
        end
       else
{$endif TP}
{$endif Delphi}
        p:=strpnew(s);
     end;


     procedure duplicatesym(sym:psym);
       var
         st : psymtable;
       begin
         Message1(sym_e_duplicate_id,sym^.name);
         st:=findunitsymtable(sym^.owner);
         if assigned(st) then
          begin
            with sym^.fileinfo do
             begin
               if st^.unitid=0 then
                Message2(sym_h_duplicate_id_where,current_module^.sourcefiles^.get_file_name(fileindex),tostr(line))
               else
                Message2(sym_h_duplicate_id_where,'unit '+st^.name^,tostr(line));
             end;
          end;
       end;


{****************************************************************************
                               TRef
****************************************************************************}

    constructor tref.init(ref :pref;pos : pfileposinfo);
      begin
        nextref:=nil;
        if pos<>nil then
          posinfo:=pos^;
        if assigned(current_module) then
          moduleindex:=current_module^.unit_index;
        if assigned(ref) then
          ref^.nextref:=@self;
        is_written:=false;
      end;


    destructor tref.done;
      var
         inputfile : pinputfile;
      begin
         inputfile:=get_source_file(moduleindex,posinfo.fileindex);
         if inputfile<>nil then
           dec(inputfile^.ref_count);
         if assigned(nextref) then
          dispose(nextref,done);
         nextref:=nil;
      end;


{****************************************************************************
                               TDeref
****************************************************************************}

    constructor tderef.init(typ:tdereftype;i:word);
      begin
        dereftype:=typ;
        index:=i;
        next:=nil;
      end;


    destructor tderef.done;
      begin
      end;


{*****************************************************************************
                           PPU Reading Writing
*****************************************************************************}

{$I symppu.inc}


{*****************************************************************************
                            Definition Helpers
*****************************************************************************}

    function globaldef(const s : string) : pdef;

      var st : string;
          symt : psymtable;
      begin
         srsym := nil;
         if pos('.',s) > 0 then
           begin
           st := copy(s,1,pos('.',s)-1);
           getsym(st,false);
           st := copy(s,pos('.',s)+1,255);
           if assigned(srsym) then
             begin
             if srsym^.typ = unitsym then
               begin
               symt := punitsym(srsym)^.unitsymtable;
               srsym := symt^.search(st);
               end else srsym := nil;
             end;
           end else st := s;
         if srsym = nil then getsym(st,false);
         if srsym = nil then
           getsymonlyin(systemunit,st);
         if srsym^.typ<>typesym then
           begin
             Message(type_e_type_id_expected);
             exit;
           end;
         globaldef := ptypesym(srsym)^.definition;
      end;

{*****************************************************************************
                        Symbol / Definition Resolving
*****************************************************************************}

    procedure resolvederef(var p:pderef;var st:psymtable;var idx:word);
      var
        hp : pderef;
        pd : pdef;
      begin
        st:=nil;
        idx:=0;
        while assigned(p) do
         begin
           case p^.dereftype of
             derefaktrecordindex :
               begin
                 st:=aktrecordsymtable;
                 idx:=p^.index;
               end;
             derefaktstaticindex :
               begin
                 st:=aktstaticsymtable;
                 idx:=p^.index;
               end;
             derefaktlocal :
               begin
                 st:=aktlocalsymtable;
                 idx:=p^.index;
               end;
             derefunit :
               begin
{$ifdef NEWMAP}
                 st:=psymtable(current_module^.map^[p^.index]^.globalsymtable);
{$else NEWMAP}
                 st:=psymtable(current_module^.map^[p^.index]);
{$endif NEWMAP}
               end;
             derefrecord :
               begin
                 pd:=st^.getdefnr(p^.index);
                 case pd^.deftype of
                   recorddef :
                     st:=precorddef(pd)^.symtable;
                   objectdef :
                     st:=pobjectdef(pd)^.symtable;
                 else
                   internalerror(556658);
                 end;
               end;
             dereflocal :
               begin
                  pd:=st^.getdefnr(p^.index);
                  case pd^.deftype of
                    procdef :
                      st:=pprocdef(pd)^.localst;
                    else
                   internalerror(556658);
                 end;
               end;
             derefpara :
               begin
                  pd:=st^.getdefnr(p^.index);
                  case pd^.deftype of
                    procdef :
                      st:=pprocdef(pd)^.parast;
                    else
                   internalerror(556658);
                 end;
               end;
             derefindex :
               begin
                 idx:=p^.index;
               end;
             else
               internalerror(556658);
           end;
           hp:=p;
           p:=p^.next;
           dispose(hp,done);
         end;
      end;


    procedure resolvedef(var def:pdef);
      var
        st   : psymtable;
        idx  : word;
      begin
        resolvederef(pderef(def),st,idx);
        if assigned(st) then
         def:=st^.getdefnr(idx)
        else
         def:=nil;
      end;

    procedure resolvesym(var sym:psym);
      var
        st   : psymtable;
        idx  : word;
      begin
        resolvederef(pderef(sym),st,idx);
        if assigned(st) then
         sym:=st^.getsymnr(idx)
        else
         sym:=nil;
      end;


{*****************************************************************************
                        Symbol Call Back Functions
*****************************************************************************}

    procedure derefsym(p : pnamedindexobject);
      begin
         psym(p)^.deref;
      end;

    procedure derefsymsdelayed(p : pnamedindexobject);
      begin
         if psym(p)^.typ in [absolutesym,propertysym] then
           psym(p)^.deref;
      end;

    procedure check_forward(sym : pnamedindexobject);
      begin
         if psym(sym)^.typ=procsym then
           pprocsym(sym)^.check_forward
         { check also object method table            }
         { we needn't to test the def list          }
         { because each object has to have a type sym }
         else
          if (psym(sym)^.typ=typesym) and
             assigned(ptypesym(sym)^.definition) and
             (ptypesym(sym)^.definition^.deftype=objectdef) then
           pobjectdef(ptypesym(sym)^.definition)^.check_forwards;
      end;

    procedure labeldefined(p : pnamedindexobject);
      begin
        if (psym(p)^.typ=labelsym) and
           not(plabelsym(p)^.defined) then
          Message1(sym_w_label_not_defined,p^.name);
      end;

    procedure unitsymbolused(p : pnamedindexobject);
      begin
         if (psym(p)^.typ=unitsym) and
            (punitsym(p)^.refs=0) then
           comment(V_info,'Unit '+p^.name+' is not used');
      end;

    procedure varsymbolused(p : pnamedindexobject);
      begin
         if (psym(p)^.typ=varsym) and
            ((psym(p)^.owner^.symtabletype in [parasymtable,localsymtable,staticsymtable])) then
           { unused symbol should be reported only if no }
           { error is reported                     }
           { if the symbol is in a register it is used   }
           { also don't count the value parameters which have local copies }
           { also don't claim for high param of open parameters (PM) }
           if (pvarsym(p)^.refs=0) and
              (Errorcount=0) and
              (copy(p^.name,1,3)<>'val') and
              (copy(p^.name,1,4)<>'high') then
             begin
                if (psym(p)^.owner^.symtabletype=parasymtable) or pvarsym(p)^.islocalcopy then
                  MessagePos1(psym(p)^.fileinfo,sym_h_para_identifier_not_used,p^.name)
                else
                  MessagePos1(psym(p)^.fileinfo,sym_n_local_identifier_not_used,p^.name);
             end;
      end;

{$ifdef GDB}
    procedure concatstab(p : pnamedindexobject);
      begin
        if psym(p)^.typ <> procsym then
          psym(p)^.concatstabto(asmoutput);
      end;

    procedure concattypestab(p : pnamedindexobject);
      begin
        if psym(p)^.typ = typesym then
         begin
           psym(p)^.isstabwritten:=false;
           psym(p)^.concatstabto(asmoutput);
         end;
      end;

    procedure forcestabto(asmlist : paasmoutput; pd : pdef);
      begin
        if not pd^.is_def_stab_written then
         begin
           if assigned(pd^.sym) then
            pd^.sym^.isusedinstab := true;
           pd^.concatstabto(asmlist);
         end;
      end;
{$endif}

{$ifdef CHAINPROCSYMS}
    procedure chainprocsym(p : psym);
      var
         storesymtablestack : psymtable;
      begin
         if p^.typ=procsym then
           begin
              storesymtablestack:=symtablestack;
              symtablestack:=p^.owner^.next;
              while assigned(symtablestack) do
                begin
                  { search for same procsym in other units }
                  getsym(p^.name,false);
                  if assigned(srsym) and (srsym^.typ=procsym) then
                    begin
                       pprocsym(p)^.nextprocsym:=pprocsym(srsym);
                       symtablestack:=storesymtablestack;
                       exit;
                    end
                  else if srsym=nil then
                    symtablestack:=nil
                  else
                    symtablestack:=srsymtable^.next;
                end;
              symtablestack:=storesymtablestack;
           end;
      end;
{$endif}

    procedure write_refs(sym : pnamedindexobject);
      begin
         psym(sym)^.write_references;
      end;

{$ifdef BrowserLog}
    procedure add_to_browserlog(sym : pnamedindexobject);
      begin
         psym(sym)^.add_to_browserlog;
      end;
{$endif UseBrowser}


{*****************************************************************************
                          Search Symtables for Syms
*****************************************************************************}

    procedure getsym(const s : stringid;notfounderror : boolean);
      var
        speedvalue : longint;
      begin
         speedvalue:=getspeedvalue(s);
         lastsrsym:=nil;
         srsymtable:=symtablestack;
         while assigned(srsymtable) do
           begin
              srsym:=srsymtable^.speedsearch(s,speedvalue);
              if assigned(srsym) then
                exit
              else
                srsymtable:=srsymtable^.next;
           end;
         if notfounderror then
           begin
              Message1(sym_e_id_not_found,s);
              srsym:=generrorsym;
           end
         else
           srsym:=nil;
      end;


    procedure getsymonlyin(p : psymtable;const s : stringid);
      begin
         { the caller have to take care if srsym=nil (FK) }
         srsym:=nil;
         if assigned(p) then
           begin
              srsymtable:=p;
              srsym:=srsymtable^.search(s);
              if assigned(srsym) then
                exit
              else
               begin
                  if (punitsymtable(srsymtable)=punitsymtable(current_module^.globalsymtable)) then
                    begin
                       getsymonlyin(psymtable(current_module^.localsymtable),s);
                       if assigned(srsym) then
                         srsymtable:=psymtable(current_module^.localsymtable)
                       else
                         Message1(sym_e_id_not_found,s);
                    end
                  else
                    Message1(sym_e_id_not_found,s);
               end;
           end;
      end;


    function search_a_symtable(const symbol:string;symtabletype:tsymtabletype):Psym;
    {Search for a symbol in a specified symbol table. Returns nil if
     the symtable is not found, and also if the symbol cannot be found
     in the desired symtable }
    var hsymtab:Psymtable;
        res:Psym;
    begin
        res:=nil;
        hsymtab:=symtablestack;
        while (hsymtab<>nil) and (hsymtab^.symtabletype<>symtabletype) do
            hsymtab:=hsymtab^.next;
        if hsymtab<>nil then
            {We found the desired symtable. Now check if the symbol we
             search for is defined in it }
            res:=hsymtab^.search(symbol);
        search_a_symtable:=res;
    end;


{****************************************************************************
                                TSYMTABLE
****************************************************************************}

    constructor tsymtable.init(t : tsymtabletype);
      begin
         symtabletype:=t;
         symtablelevel:=0;
         defowner:=nil;
         unitid:=0;
         next:=nil;
         name:=nil;
         address_fixup:=0;
         datasize:=0;
         dataalignment:=1;
         new(symindex,init(indexgrowsize));
         new(defindex,init(indexgrowsize));
         if symtabletype<>withsymtable then
           begin
              new(symsearch,init);
              symsearch^.noclear:=true;
           end
         else
           symsearch:=nil;
         alignment:=def_alignment;
      end;


    destructor tsymtable.done;
      begin
        stringdispose(name);
        dispose(symindex,done);
        dispose(defindex,done);
        { symsearch can already be disposed or set to nil for withsymtable }
        if assigned(symsearch) then
         begin
           dispose(symsearch,done);
           symsearch:=nil;
         end;
      end;


    constructor twithsymtable.init;
      begin
         inherited init(withsymtable);
         direct_with:=false;
         withnode:=nil;
         withrefnode:=nil;
      end;


    destructor twithsymtable.done;
      begin
        symsearch:=nil;
        inherited done;
      end;


{***********************************************
                Helpers
***********************************************}

   function tsymtable.getnewtypecount : word;
      begin
         getnewtypecount:=pglobaltypecount^;
         inc(pglobaltypecount^);
      end;

    procedure tsymtable.registerdef(p : pdef);
      begin
         defindex^.insert(p);
         { set def owner and indexnb }
         p^.owner:=@self;
      end;


    procedure tsymtable.foreach(proc2call : tnamedindexcallback);
      begin
        symindex^.foreach(proc2call);
      end;


{***********************************************
       LOAD / WRITE SYMTABLE FROM PPU
***********************************************}

    procedure tsymtable.loaddefs;
      var
        hp : pdef;
        b  : byte;
      begin
      { load start of definition section, which holds the amount of defs }
         if current_ppu^.readentry<>ibstartdefs then
          Message(unit_f_ppu_read_error);
         current_ppu^.getlongint;
      { read definitions }
         repeat
           b:=current_ppu^.readentry;
           case b of
              ibpointerdef : hp:=new(ppointerdef,load);
                ibarraydef : hp:=new(parraydef,load);
                  iborddef : hp:=new(porddef,load);
                ibfloatdef : hp:=new(pfloatdef,load);
                 ibprocdef : hp:=new(pprocdef,load);
          ibshortstringdef : hp:=new(pstringdef,shortload);
           iblongstringdef : hp:=new(pstringdef,longload);
           ibansistringdef : hp:=new(pstringdef,ansiload);
           ibwidestringdef : hp:=new(pstringdef,wideload);
               ibrecorddef : hp:=new(precorddef,load);
               ibobjectdef : hp:=new(pobjectdef,load);
                 ibenumdef : hp:=new(penumdef,load);
                  ibsetdef : hp:=new(psetdef,load);
              ibprocvardef : hp:=new(pprocvardef,load);
                 ibfiledef : hp:=new(pfiledef,load);
             ibclassrefdef : hp:=new(pclassrefdef,load);
               ibformaldef : hp:=new(pformaldef,load);
                 ibenddefs : break;
                     ibend : Message(unit_f_ppu_read_error);
           else
             Message1(unit_f_ppu_invalid_entry,tostr(b));
           end;
           hp^.owner:=@self;
           defindex^.insert(hp);
         until false;
      end;


    procedure tsymtable.loadsyms;
      var
        b   : byte;
        sym : psym;
      begin
      { load start of definition section, which holds the amount of defs }
         if current_ppu^.readentry<>ibstartsyms then
          Message(unit_f_ppu_read_error);
         { skip amount of symbols, not used currently }
         current_ppu^.getlongint;
         { load datasize,dataalignment of this symboltable }
         datasize:=current_ppu^.getlongint;
         dataalignment:=current_ppu^.getlongint;
      { now read the symbols }
         repeat
           b:=current_ppu^.readentry;
           case b of
                ibtypesym : sym:=new(ptypesym,load);
                ibprocsym : sym:=new(pprocsym,load);
               ibconstsym : sym:=new(pconstsym,load);
                 ibvarsym : sym:=new(pvarsym,load);
             ibfuncretsym : sym:=new(pfuncretsym,load);
            ibabsolutesym : sym:=new(pabsolutesym,load);
                ibenumsym : sym:=new(penumsym,load);
          ibtypedconstsym : sym:=new(ptypedconstsym,load);
            ibpropertysym : sym:=new(ppropertysym,load);
                ibunitsym : sym:=new(punitsym,load);
               iblabelsym : sym:=new(plabelsym,load);
                 ibsyssym : sym:=new(psyssym,load);
                ibendsyms : break;
                    ibend : Message(unit_f_ppu_read_error);
           else
             Message1(unit_f_ppu_invalid_entry,tostr(b));
           end;
           sym^.owner:=@self;
           symindex^.insert(sym);
           symsearch^.insert(sym);
         until false;
      end;


    procedure tsymtable.writedefs;
      var
         pd : pdef;
      begin
      { each definition get a number, write then the amount of defs to the
         ibstartdef entry }
         current_ppu^.putlongint(defindex^.count);
         current_ppu^.writeentry(ibstartdefs);
      { now write the definition }
         pd:=pdef(defindex^.first);
         while assigned(pd) do
           begin
              pd^.write;
              pd:=pdef(pd^.next);
           end;
      { write end of definitions }
         current_ppu^.writeentry(ibenddefs);
      end;


    procedure tsymtable.writesyms;
      var
        pd : psym;
      begin
       { each definition get a number, write then the amount of syms and the
         datasize to the ibsymdef entry }
         current_ppu^.putlongint(symindex^.count);
         current_ppu^.putlongint(datasize);
         current_ppu^.putlongint(dataalignment);
         current_ppu^.writeentry(ibstartsyms);
       { foreach is used to write all symbols }
         pd:=psym(symindex^.first);
         while assigned(pd) do
           begin
              pd^.write;
              pd:=psym(pd^.next);
           end;
       { end of symbols }
         current_ppu^.writeentry(ibendsyms);
      end;


    procedure tsymtable.deref;
      var
        hp : pdef;
        hs : psym;
      begin
        hp:=pdef(defindex^.first);
        while assigned(hp) do
         begin
           hp^.deref;
           hp^.symderef;
           hp:=pdef(hp^.next);
         end;

        hs:=psym(symindex^.first);
        while assigned(hs) do
         begin
           hs^.deref;
           hs:=psym(hs^.next);
         end;
      end;


    constructor tsymtable.load;
      var
         st_loading : boolean;
      begin
        st_loading:=in_loading;
        in_loading:=true;
{$ifndef NEWMAP}
        current_module^.map^[0]:=@self;
{$else NEWMAP}
        current_module^.globalsymtable:=@self;
{$endif NEWMAP}

        symtabletype:=unitsymtable;
        symtablelevel:=0;

        { unused for units }
        address_fixup:=0;

        datasize:=0;
        defowner:=nil;
        name:=nil;
        unitid:=0;
        defowner:=nil;
        new(symindex,init(indexgrowsize));
        new(defindex,init(indexgrowsize));
        new(symsearch,init);
        symsearch^.usehash;
        symsearch^.noclear:=true;
        alignment:=def_alignment;

      { load definitions }
        loaddefs;

      { load symbols }
        loadsyms;

      { Now we can deref the symbols and definitions }
        if not(symtabletype in [objectsymtable,recordsymtable]) then
          deref;

{$ifdef NEWMAP}
        { necessary for dependencies }
        current_module^.globalsymtable:=nil;
{$endif NEWMAP}
        in_loading:=st_loading;
      end;


    procedure tsymtable.write;
      begin
      { write definitions }
         writedefs;
      { write symbols }
         writesyms;
      end;


    constructor tsymtable.loadas(typ : tsymtabletype);
      var
         storesymtable : psymtable;
         st_loading : boolean;
      begin
         st_loading:=in_loading;
         in_loading:=true;
         symtabletype:=typ;
         new(symindex,init(indexgrowsize));
         new(defindex,init(indexgrowsize));
         new(symsearch,init);
         symsearch^.noclear:=true;
         defowner:=nil;
         if typ in [recordsymtable,objectsymtable] then
           begin
             storesymtable:=aktrecordsymtable;
             aktrecordsymtable:=@self;
           end;
         if typ in [parasymtable,localsymtable] then
           begin
             storesymtable:=aktlocalsymtable;
             aktlocalsymtable:=@self;
           end;
         { used for local browser }
         if typ=staticppusymtable then
           begin
              aktstaticsymtable:=@self;
              symsearch^.usehash;
           end;
         name:=nil;
         alignment:=def_alignment;
         { isn't used there }
         datasize:=0;
         address_fixup:= 0;
         { also unused }
         unitid:=0;

      { load definitions }
      { we need the correct symtable for registering }
         if not (typ in [localsymtable,parasymtable,recordsymtable,objectsymtable]) then
           begin
             next:=symtablestack;
             symtablestack:=@self;
           end;

      { load definitions }
         loaddefs;

      { load symbols }
         loadsyms;

      { now we can deref the syms and defs }
         if not (typ in [localsymtable,parasymtable,
                         recordsymtable,objectsymtable]) then
           deref;

         if typ in [recordsymtable,objectsymtable] then
           aktrecordsymtable:=storesymtable;
         if typ in [localsymtable,parasymtable] then
           aktlocalsymtable:=storesymtable;
         if not (typ in [localsymtable,parasymtable,recordsymtable,objectsymtable]) then
           begin
             symtablestack:=next;
           end;
        in_loading:=st_loading;
      end;


    procedure tsymtable.writeas;
      var
         oldtyp : byte;
         storesymtable : psymtable;
      begin
         oldtyp:=current_ppu^.entrytyp;
         storesymtable:=aktrecordsymtable;
         if symtabletype in [recordsymtable,objectsymtable] then
           begin
             storesymtable:=aktrecordsymtable;
             aktrecordsymtable:=@self;
           end;
         if symtabletype in [parasymtable,localsymtable] then
           begin
             storesymtable:=aktlocalsymtable;
             aktlocalsymtable:=@self;
           end;
         if (symtabletype in [recordsymtable,objectsymtable]) then
         current_ppu^.entrytyp:=subentryid;
         { write definitions }
         writedefs;
         { write symbols }
         writesyms;
         current_ppu^.entrytyp:=oldtyp;
         if symtabletype in [recordsymtable,objectsymtable] then
           aktrecordsymtable:=storesymtable;
         if symtabletype in [localsymtable,parasymtable] then
           aktlocalsymtable:=storesymtable;
      end;


{***********************************************
          Get Symbol / Def by Number
***********************************************}

    function tsymtable.getsymnr(l : longint) : psym;
      var
        hp : psym;
      begin
        hp:=psym(symindex^.search(l));
        if hp=nil then
         internalerror(10999);
        getsymnr:=hp;
      end;

    function tsymtable.getdefnr(l : longint) : pdef;
      var
        hp : pdef;
      begin
        hp:=pdef(defindex^.search(l));
        if hp=nil then
         internalerror(10998);
        getdefnr:=hp;
      end;


{***********************************************
                Table Access
***********************************************}

    procedure tsymtable.clear;
      begin
         { remove no entry from a withsymtable as it is only a pointer to the
         recorddef  or objectdef symtable }
         if symtabletype=withsymtable then
           exit;
         symindex^.clear;
         defindex^.clear;
      end;


    function tsymtable.insert(sym:psym):psym;
      var
         hp : psymtable;
         hsym : psym;
      begin
         { set owner and sym indexnb }
         sym^.owner:=@self;
{$ifdef CHAINPROCSYMS}
         { set the nextprocsym field }
         if sym^.typ=procsym then
           chainprocsym(sym);
{$endif CHAINPROCSYMS}
         { writes the symbol in data segment if required }
         { also sets the datasize of owner             }
         if not in_loading then
           sym^.insert_in_data;
         if (symtabletype in [staticsymtable,globalsymtable]) then
           begin
              hp:=symtablestack;
              while assigned(hp) do
                begin
                   if hp^.symtabletype in [staticsymtable,globalsymtable] then
                    begin
                       hsym:=hp^.search(sym^.name);
                       if assigned(hsym) then
                         DuplicateSym(hsym);
                    end;
                  hp:=hp^.next;
                end;
           end;

         { check for duplicate id in local and parsymtable symtable }
         if (symtabletype=localsymtable) then
           { to be on the sure side: }
           begin
              if assigned(next) and
                (next^.symtabletype=parasymtable) then
                begin
                   hsym:=next^.search(sym^.name);
                   if assigned(hsym) then
                     DuplicateSym(hsym);
                end
              else if (current_module^.flags and uf_local_browser)=0 then
                internalerror(43789);
           end;

         { check for duplicate id in local symtable of methods }
         if (symtabletype=localsymtable) and
           assigned(next) and
           assigned(next^.next) and
          { funcretsym is allowed !! }
           (sym^.typ <> funcretsym) and
           (next^.next^.symtabletype=objectsymtable) then
           begin
              hsym:=search_class_member(pobjectdef(next^.next^.defowner),sym^.name);
              { but private ids can be reused }
              if assigned(hsym) and
                (not(sp_private in hsym^.symoptions) or
                 (hsym^.owner^.defowner^.owner^.symtabletype<>unitsymtable)) then
                DuplicateSym(hsym);
           end;
         { check for duplicate id in para symtable of methods }
         if (symtabletype=parasymtable) and
           assigned(procinfo^._class) and
         { but not in nested procedures !}
            (not(assigned(procinfo^.parent)) or
             (assigned(procinfo^.parent) and
              not(assigned(procinfo^.parent^._class)))
            ) and
          { funcretsym is allowed !! }
           (sym^.typ <> funcretsym) then
           begin
              hsym:=search_class_member(procinfo^._class,sym^.name);
              { but private ids can be reused }
              if assigned(hsym) and
                (not(sp_private in hsym^.symoptions) or
                 (hsym^.owner^.defowner^.owner^.symtabletype<>unitsymtable)) then
                DuplicateSym(hsym);
           end;
         { check for duplicate field id in inherited classes }
         if (sym^.typ=varsym) and
            (symtabletype=objectsymtable) and
            assigned(defowner) then
           begin
              hsym:=search_class_member(pobjectdef(defowner),sym^.name);
              { but private ids can be reused }
              if assigned(hsym) and
                (not(sp_private in hsym^.symoptions) or
                 (hsym^.owner^.defowner^.owner^.symtabletype<>unitsymtable)) then
                DuplicateSym(hsym);
           end;
         { register definition of typesym }
         if (sym^.typ = typesym) and
            assigned(ptypesym(sym)^.definition) then
          begin
            if not(assigned(ptypesym(sym)^.definition^.owner)) and
               (ptypesym(sym)^.definition^.deftype<>errordef) then
              registerdef(ptypesym(sym)^.definition);
{$ifdef GDB}
            if (cs_debuginfo in aktmoduleswitches) and assigned(debuglist) and
               (symtabletype in [globalsymtable,staticsymtable]) then
              begin
                ptypesym(sym)^.isusedinstab := true;
                sym^.concatstabto(debuglist);
              end;
{$endif GDB}
          end;
         { insert in index and search hash }
         symindex^.insert(sym);
         symsearch^.insert(sym);
         insert:=sym;
      end;


    function tsymtable.search(const s : stringid) : psym;
      begin
        {search:=psym(symsearch^.search(s));
         this bypasses the ref generation (PM) }
        search:=speedsearch(s,getspeedvalue(s));
      end;


    function tsymtable.speedsearch(const s : stringid;speedvalue : longint) : psym;
      var
        hp : psym;
      begin
        hp:=psym(symsearch^.speedsearch(s,speedvalue));
        if assigned(hp) then
         begin
           { reject non static members in static procedures,
             be carefull aktprocsym^.definition is not allways
             loaded already (PFV) }
           if (symtabletype=objectsymtable) and
              not(sp_static in hp^.symoptions) and
              allow_only_static
              {assigned(aktprocsym) and
              assigned(aktprocsym^.definition) and
              ((aktprocsym^.definition^.options and postaticmethod)<>0)} then
                  Message(sym_e_only_static_in_static);
           if (symtabletype=unitsymtable) and
              assigned(punitsymtable(@self)^.unitsym) then
             inc(punitsymtable(@self)^.unitsym^.refs);
           { unitsym are only loaded for browsing PM    }
           { this was buggy anyway because we could use }
           { unitsyms from other units in _USES !!      }
           if (symtabletype=unitsymtable) and (hp^.typ=unitsym) and
              assigned(current_module) and (current_module^.globalsymtable<>@self) then
             hp:=nil;
           if assigned(hp) and
              (cs_browser in aktmoduleswitches) and make_ref then
             begin
                hp^.lastref:=new(pref,init(hp^.lastref,@tokenpos));
                { for symbols that are in tables without
                browser info or syssyms (PM) }
                if hp^.refcount=0 then
                  hp^.defref:=hp^.lastref;
                inc(hp^.refcount);
             end;
         end;
        speedsearch:=hp;
      end;


    function tsymtable.rename(const olds,news : stringid):psym;
      begin
        rename:=psym(symsearch^.rename(olds,news));
      end;


{***********************************************
                Browser
***********************************************}

    procedure tsymtable.load_browser;
      var
        b     : byte;
        sym   : psym;
        prdef : pdef;
        oldrecsyms : psymtable;
      begin
         if symtabletype in [recordsymtable,objectsymtable] then
           begin
              oldrecsyms:=aktrecordsymtable;
              aktrecordsymtable:=@self;
           end;
         if symtabletype in [parasymtable,localsymtable] then
           begin
              oldrecsyms:=aktlocalsymtable;
              aktlocalsymtable:=@self;
           end;
         if symtabletype=staticppusymtable then
           aktstaticsymtable:=@self;
         b:=current_ppu^.readentry;
         if b <> ibbeginsymtablebrowser then
           Message1(unit_f_ppu_invalid_entry,tostr(b));
         repeat
           b:=current_ppu^.readentry;
           case b of
           ibsymref : begin
                        sym:=readsymref;
                        resolvesym(sym);
                        if assigned(sym) then
                          sym^.load_references;
                      end;
           ibdefref : begin
                        prdef:=readdefref;
                        resolvedef(prdef);
                        if assigned(prdef) then
                         begin
                           if prdef^.deftype<>procdef then
                            Message(unit_f_ppu_read_error);
                           pprocdef(prdef)^.load_references;
                         end;
                      end;
            ibendsymtablebrowser : break;
           else
             Message1(unit_f_ppu_invalid_entry,tostr(b));
           end;
         until false;
        if symtabletype in [recordsymtable,objectsymtable] then
          aktrecordsymtable:=oldrecsyms;
        if symtabletype in [parasymtable,localsymtable] then
          aktlocalsymtable:=oldrecsyms;
      end;


    procedure tsymtable.write_browser;
      var
         oldrecsyms : psymtable;
      begin
         { symbol numbering for references
           should have been done in write PM
         number_symbols;
         number_defs;   }

         if symtabletype in [recordsymtable,objectsymtable] then
           begin
              oldrecsyms:=aktrecordsymtable;
              aktrecordsymtable:=@self;
           end;
         if symtabletype in [parasymtable,localsymtable] then
           begin
              oldrecsyms:=aktlocalsymtable;
              aktlocalsymtable:=@self;
           end;
         current_ppu^.writeentry(ibbeginsymtablebrowser);
         foreach({$ifndef TP}@{$endif}write_refs);
         current_ppu^.writeentry(ibendsymtablebrowser);
        if symtabletype in [recordsymtable,objectsymtable] then
          aktrecordsymtable:=oldrecsyms;
        if symtabletype in [parasymtable,localsymtable] then
          aktlocalsymtable:=oldrecsyms;
      end;


{$ifdef BrowserLog}
    procedure tsymtable.writebrowserlog;
      begin
        if cs_browser in aktmoduleswitches then
         begin
           if assigned(name) then
             Browserlog.AddLog('---Symtable '+name^)
           else
             begin
                if (symtabletype=recordsymtable) and
                  assigned(defowner^.sym) then
                  Browserlog.AddLog('---Symtable '+defowner^.sym^.name)
                else
                  Browserlog.AddLog('---Symtable with no name');
             end;
           Browserlog.Ident;
           foreach({$ifndef TP}@{$endif}add_to_browserlog);
           browserlog.Unident;
         end;
      end;
{$endif BrowserLog}


{***********************************************
           Process all entries
***********************************************}

    { checks, if all procsyms and methods are defined }
    procedure tsymtable.check_forwards;
      begin
         foreach({$ifndef TP}@{$endif}check_forward);
      end;

    procedure tsymtable.checklabels;
      begin
         foreach({$ifndef TP}@{$endif}labeldefined);
      end;

    procedure tsymtable.set_alignment(_alignment : byte);
      var
         sym : pvarsym;
         l : longint;
      begin
        { this can not be done if there is an
          hasharray ! }
        alignment:=_alignment;
        if (symtabletype<>parasymtable) then
          internalerror(1111);
        sym:=pvarsym(symindex^.first);
        datasize:=0;
        { there can be only varsyms }
        while assigned(sym) do
          begin
             l:=sym^.getpushsize;
             sym^.address:=datasize;
             datasize:=align(datasize+l,alignment);
             sym:=pvarsym(sym^.next);
          end;
      end;

    function tsymtable.find_at_offset(l : longint) : pvarsym;
      var
         sym : pvarsym;
      begin
        find_at_offset:=nil;
        { this can not be done if there is an
          hasharray ! }
        if (symtabletype<>parasymtable) then
          internalerror(1111);
        sym:=pvarsym(symindex^.first);
        while assigned(sym) do
          begin
             if sym^.address+address_fixup=l then
               begin
                 find_at_offset:=sym;
                 exit;
               end;
             sym:=pvarsym(sym^.next);
          end;
      end;

    procedure tsymtable.allunitsused;
      begin
         foreach({$ifndef TP}@{$endif}unitsymbolused);
      end;

    procedure tsymtable.allsymbolsused;
      begin
         foreach({$ifndef TP}@{$endif}varsymbolused);
      end;

{$ifdef CHAINPROCSYMS}
    procedure tsymtable.chainprocsyms;
      begin
         foreach({$ifndef TP}@{$endif}chainprocsym);
      end;
{$endif CHAINPROCSYMS}

{$ifdef GDB}
      procedure tsymtable.concatstabto(asmlist : paasmoutput);
      begin
        asmoutput:=asmlist;
        foreach({$ifndef TP}@{$endif}concatstab);
      end;
{$endif}


{****************************************************************************
                              TUNITSYMTABLE
****************************************************************************}

    constructor tunitsymtable.init(t : tsymtabletype; const n : string);
      begin
         inherited init(t);
         name:=stringdup(upper(n));
         unitid:=0;
         unitsym:=nil;
         symsearch^.usehash;
       { reset GDB things }
{$ifdef GDB}
         if (t = globalsymtable) then
           begin
              prev_dbx_counter := dbx_counter;
              dbx_counter := nil;
           end;
         is_stab_written:=false;
         dbx_count := -1;
         if cs_gdb_dbx in aktglobalswitches then
           begin
             dbx_count := 0;
             unittypecount:=1;
             if (symtabletype=globalsymtable) then
               pglobaltypecount := @unittypecount;
             unitid:=current_module^.unitcount;
             debuglist^.concat(new(pai_asm_comment,init(strpnew('Global '+name^+' has index '+tostr(unitid)))));
             debuglist^.concat(new(pai_stabs,init(strpnew('"'+name^+'",'+tostr(N_BINCL)+',0,0,0'))));
             inc(current_module^.unitcount);
             dbx_count_ok:=false;
             dbx_counter:=@dbx_count;
             do_count_dbx:=true;
           end;
{$endif GDB}
      end;


    constructor tunitsymtable.loadasunit;
      var
        storeGlobalTypeCount : pword;
        b : byte;
      begin
         unitsym:=nil;
         unitid:=0;
{$ifdef GDB}
         if cs_gdb_dbx in aktglobalswitches then
           begin
              UnitTypeCount:=1;
              storeGlobalTypeCount:=PGlobalTypeCount;
              PglobalTypeCount:=@UnitTypeCount;
           end;
{$endif GDB}

       { load symtables }
         inherited load;
       { set the name after because it is set to nil in tsymtable.load !! }
         name:=stringdup(current_module^.modulename^);

       { dbx count }
{$ifdef GDB}
         if (current_module^.flags and uf_has_dbx)<>0 then
           begin
              b := current_ppu^.readentry;
              if b <> ibdbxcount then
               Message(unit_f_ppu_dbx_count_problem)
              else
               dbx_count := readlong;
              dbx_count_ok := true;
           end
         else
           begin
             dbx_count := -1;
             dbx_count_ok:=false;
           end;
         if cs_gdb_dbx in aktglobalswitches then
           PGlobalTypeCount:=storeGlobalTypeCount;
         is_stab_written:=false;
{$endif GDB}

         b:=current_ppu^.readentry;
         if b<>ibendimplementation then
           Message1(unit_f_ppu_invalid_entry,tostr(b));
      end;


     destructor tunitsymtable.done;
       var
          pus : punitsym;
       begin
          pus:=unitsym;
          while assigned(pus) do
            begin
               unitsym:=pus^.prevsym;
               pus^.prevsym:=nil;
               pus^.unitsymtable:=nil;
               pus:=unitsym;
            end;
          inherited done;
       end;

       procedure tunitsymtable.load_symtable_refs;
         var
            b : byte;
            unitindex : word;
         begin
         if ((current_module^.flags and uf_local_browser)<>0) then
           begin
              current_module^.localsymtable:=new(punitsymtable,loadas(staticppusymtable));
              psymtable(current_module^.localsymtable)^.name:=
                stringdup('implementation of '+psymtable(current_module^.globalsymtable)^.name^);
           end;
         { load browser }
         if (current_module^.flags and uf_has_browser)<>0 then
           begin
              {if not (cs_browser in aktmoduleswitches) then
                current_ppu^.skipuntilentry(ibendbrowser)
              else }
                begin
                   load_browser;
                   unitindex:=1;
                   while assigned(current_module^.map^[unitindex]) do
                     begin
                        {each unit wrote one browser entry }
                        load_browser;
                        inc(unitindex);
                     end;
                   b:=current_ppu^.readentry;
                   if b<>ibendbrowser then
                     Message1(unit_f_ppu_invalid_entry,tostr(b));
                end;
           end;
         if ((current_module^.flags and uf_local_browser)<>0) then
           psymtable(current_module^.localsymtable)^.load_browser;
         end;


    procedure tunitsymtable.writeasunit;
      var
         pu        : pused_unit;
      begin
      { first the unitname }
        current_ppu^.putstring(name^);
        current_ppu^.writeentry(ibmodulename);

        writesourcefiles;
        writeusedmacros;

        writeusedunit;

      { write the objectfiles and libraries that come for this unit,
        preserve the containers becuase they are still needed to load
        the link.res. All doesn't depend on the crc! It doesn't matter
        if a unit is in a .o or .a file }
        current_ppu^.do_crc:=false;
        writelinkcontainer(current_module^.linkunitofiles,iblinkunitofiles,true);
        writelinkcontainer(current_module^.linkunitstaticlibs,iblinkunitstaticlibs,true);
        writelinkcontainer(current_module^.linkunitsharedlibs,iblinkunitsharedlibs,true);
        writelinkcontainer(current_module^.linkotherofiles,iblinkotherofiles,false);
        writelinkcontainer(current_module^.linkotherstaticlibs,iblinkotherstaticlibs,true);
        writelinkcontainer(current_module^.linkothersharedlibs,iblinkothersharedlibs,true);
        current_ppu^.do_crc:=true;

        current_ppu^.writeentry(ibendinterface);

      { write the symtable entries }
        inherited write;

      { all after doesn't affect crc }
        current_ppu^.do_crc:=false;

      { write dbx count }
{$ifdef GDB}
        if cs_gdb_dbx in aktglobalswitches then
         begin
{$IfDef EXTDEBUG}
           writeln('Writing dbx_count ',dbx_count,' in unit ',name^,'.ppu');
{$ENDIF EXTDEBUG}
           current_ppu^.putlongint(dbx_count);
           current_ppu^.writeentry(ibdbxcount);
         end;
{$endif GDB}

        current_ppu^.writeentry(ibendimplementation);

         { write static symtable
           needed for local debugging of unit functions }
        if ((current_module^.flags and uf_local_browser)<>0) and
           assigned(current_module^.localsymtable) then
          psymtable(current_module^.localsymtable)^.write;
      { write all browser section }
        if (current_module^.flags and uf_has_browser)<>0 then
         begin
           write_browser;
           pu:=pused_unit(current_module^.used_units.first);
           while assigned(pu) do
            begin
              psymtable(pu^.u^.globalsymtable)^.write_browser;
              pu:=pused_unit(pu^.next);
            end;
           current_ppu^.writeentry(ibendbrowser);
         end;
        if ((current_module^.flags and uf_local_browser)<>0) and
           assigned(current_module^.localsymtable) then
          psymtable(current_module^.localsymtable)^.write_browser;

      { the last entry ibend is written automaticly }
      end;


   function tunitsymtable.getnewtypecount : word;

      begin
{$ifdef GDB}
         if not (cs_gdb_dbx in aktglobalswitches) then
           getnewtypecount:=tsymtable.getnewtypecount
         else
{$endif GDB}
           if symtabletype = staticsymtable then
           getnewtypecount:=tsymtable.getnewtypecount
         else
           begin
              getnewtypecount:=unittypecount;
              inc(unittypecount);
           end;
      end;


{$ifdef GDB}

      procedure tunitsymtable.concattypestabto(asmlist : paasmoutput);
        var prev_dbx_count : plongint;
        begin
           if is_stab_written then exit;
           if not assigned(name) then name := stringdup('Main_program');
           if (symtabletype = unitsymtable) and
              (current_module^.globalsymtable<>@Self) then
             begin
                unitid:=current_module^.unitcount;
                inc(current_module^.unitcount);
             end;
           asmlist^.concat(new(pai_asm_comment,init(strpnew('Begin unit '+name^
                  +' has index '+tostr(unitid)))));
           if cs_gdb_dbx in aktglobalswitches then
             begin
                if dbx_count_ok then
                  begin
                     asmlist^.concat(new(pai_asm_comment,init(strpnew('"repeated" unit '+name^
                              +' has index '+tostr(unitid)+' dbx count = '+tostr(dbx_count)))));
                     asmlist^.concat(new(pai_stabs,init(strpnew('"'+name^+'",'
                       +tostr(N_EXCL)+',0,0,'+tostr(dbx_count)))));
                     exit;
                  end
                else if (current_module^.globalsymtable<>@Self) then
                  begin
                    prev_dbx_count := dbx_counter;
                    dbx_counter := nil;
                    do_count_dbx:=false;
                    if symtabletype = unitsymtable then
                      asmlist^.concat(new(pai_stabs,init(strpnew('"'+name^+'",'
                        +tostr(N_BINCL)+',0,0,0'))));
                    dbx_counter := @dbx_count;
                    dbx_count:=0;
                    do_count_dbx:=assigned(dbx_counter);
                  end;
             end;
           asmoutput:=asmlist;
           foreach({$ifndef TP}@{$endif}concattypestab);
           if cs_gdb_dbx in aktglobalswitches then
             begin
                if (current_module^.globalsymtable<>@Self) then
                  begin
                    dbx_counter := prev_dbx_count;
                    do_count_dbx:=false;
                    asmlist^.concat(new(pai_asm_comment,init(strpnew('End unit '+name^
                      +' has index '+tostr(unitid)))));
                    asmlist^.concat(new(pai_stabs,init(strpnew('"'+name^+'",'
                      +tostr(N_EINCL)+',0,0,0'))));
                    do_count_dbx:=assigned(dbx_counter);
                    dbx_count_ok := true;
                  end;
             end;
           is_stab_written:=true;
        end;
{$endif}

{****************************************************************************
                              Definitions
****************************************************************************}

{$I symdef.inc}

{****************************************************************************
                                Symbols
****************************************************************************}

{$I symsym.inc}

{****************************************************************************
                               GDB Helpers
****************************************************************************}

{$ifdef GDB}
    function typeglobalnumber(const s : string) : string;

      var st : string;
          symt : psymtable;
          old_make_ref : boolean;
      begin
         old_make_ref:=make_ref;
         make_ref:=false;
         typeglobalnumber := '0';
         srsym := nil;
         if pos('.',s) > 0 then
           begin
           st := copy(s,1,pos('.',s)-1);
           getsym(st,false);
           st := copy(s,pos('.',s)+1,255);
           if assigned(srsym) then
             begin
             if srsym^.typ = unitsym then
               begin
               symt := punitsym(srsym)^.unitsymtable;
               srsym := symt^.search(st);
               end else srsym := nil;
             end;
           end else st := s;
         if srsym = nil then getsym(st,true);
         if srsym^.typ<>typesym then
           begin
             Message(type_e_type_id_expected);
             exit;
           end;
         typeglobalnumber := ptypesym(srsym)^.definition^.numberstring;
         make_ref:=old_make_ref;
      end;
{$endif GDB}


{****************************************************************************
                           Definition Helpers
****************************************************************************}

   procedure reset_global_defs;
     var
       def     : pdef;
{$ifdef debug}
       prevdef : pdef;
{$endif debug}
     begin
{$ifdef debug}
        prevdef:=nil;
{$endif debug}
{$ifdef GDB}
        pglobaltypecount:=@globaltypecount;
{$endif GDB}
        def:=firstglobaldef;
        while assigned(def) do
          begin
{$ifdef GDB}
            if assigned(def^.sym) then
              def^.sym^.isusedinstab:=false;
            def^.is_def_stab_written:=false;
{$endif GDB}
            {if not current_module^.in_implementation then}
              begin
                { reset rangenr's }
                case def^.deftype of
                  orddef   : porddef(def)^.rangenr:=0;
                  enumdef  : penumdef(def)^.rangenr:=0;
                  arraydef : parraydef(def)^.rangenr:=0;
                end;
                if def^.deftype<>objectdef then
                  def^.has_rtti:=false;
                def^.has_inittable:=false;
              end;
{$ifdef debug}
            prevdef:=def;
{$endif debug}
            def:=def^.nextglobal;
          end;
     end;


{****************************************************************************
                              Object Helpers
****************************************************************************}

    function search_class_member(pd : pobjectdef;const n : string) : psym;
    { searches n in symtable of pd and all anchestors }
      var
         sym : psym;
      begin
         sym:=nil;
         while assigned(pd) do
           begin
              sym:=pd^.symtable^.search(n);
              if assigned(sym) then
                break;
              pd:=pd^.childof;
           end;
         { this is needed for static methods in do_member_read pexpr unit PM
           caused bug0214 }
         if assigned(sym) then
           begin
             srsymtable:=pd^.symtable;
           end;
         search_class_member:=sym;
      end;

   var
      _defaultprop : ppropertysym;

   procedure testfordefaultproperty(p : pnamedindexobject);
     begin
        if (psym(p)^.typ=propertysym) and
           (ppo_defaultproperty in ppropertysym(p)^.propoptions) then
          _defaultprop:=ppropertysym(p);
     end;


   function search_default_property(pd : pobjectdef) : ppropertysym;
   { returns the default property of a class, searches also anchestors }
     begin
        _defaultprop:=nil;
        while assigned(pd) do
          begin
             pd^.symtable^.foreach({$ifndef TP}@{$endif}testfordefaultproperty);
             if assigned(_defaultprop) then
               break;
             pd:=pd^.childof;
          end;
        search_default_property:=_defaultprop;
     end;


{****************************************************************************
                               Macro's
****************************************************************************}

      procedure def_macro(const s : string);
        var
          mac : pmacrosym;
        begin
           mac:=pmacrosym(macros^.search(s));
           if mac=nil then
             begin
               mac:=new(pmacrosym,init(s));
               Message1(parser_m_macro_defined,mac^.name);
               macros^.insert(mac);
             end;
           mac^.defined:=true;
           mac^.defined_at_startup:=true;
        end;


      procedure set_macro(const s : string;value : string);
        var
          mac : pmacrosym;
        begin
           mac:=pmacrosym(macros^.search(s));
           if mac=nil then
             begin
               mac:=new(pmacrosym,init(s));
               macros^.insert(mac);
             end
           else
             begin
                if assigned(mac^.buftext) then
                  freemem(mac^.buftext,mac^.buflen);
             end;
           Message2(parser_m_macro_set_to,mac^.name,value);
           mac^.buflen:=length(value);
           getmem(mac^.buftext,mac^.buflen);
           move(value[1],mac^.buftext^,mac^.buflen);
           mac^.defined:=true;
           mac^.defined_at_startup:=true;
        end;


{$ifdef UNITALIASES}
{****************************************************************************
                              TUNIT_ALIAS
 ****************************************************************************}

    constructor tunit_alias.init(const n:string);
      var
        i : longint;
      begin
        i:=pos('=',n);
        if i=0 then
         fail;
        inherited initname(Copy(n,1,i-1));
        newname:=stringdup(Copy(n,i+1,255));
      end;


    destructor tunit_alias.done;
      begin
        stringdispose(newname);
        inherited done;
      end;


    procedure addunitalias(const n:string);
      begin
        unitaliases^.insert(new(punit_alias,init(Upper(n))));
      end;


    function getunitalias(const n:string):string;
      var
        p : punit_alias;
      begin
        p:=punit_alias(unitaliases^.search(Upper(n)));
        if assigned(p) then
         getunitalias:=punit_alias(p)^.newname^
        else
         getunitalias:=n;
      end;
{$endif UNITALIASES}


{****************************************************************************
                            Symtable Stack
****************************************************************************}

    procedure dellexlevel;
      var
         p : psymtable;
      begin
         p:=symtablestack;
         symtablestack:=p^.next;
         { symbol tables of unit interfaces are never disposed }
         { this is handle by the unit unitm                 }
         if not(p^.symtabletype in [unitsymtable,globalsymtable,stt_exceptsymtable]) or dispose_global then
          dispose(p,done);
      end;

{$ifdef DEBUG}
    procedure test_symtablestack;
      var
         p : psymtable;
         i : longint;
      begin
         p:=symtablestack;
         i:=0;
         while assigned(p) do
           begin
              inc(i);
              p:=p^.next;
              if i>500 then
               Message(sym_f_internal_error_in_symtablestack);
           end;
      end;

    procedure list_symtablestack;
      var
         p : psymtable;
         i : longint;
      begin
         p:=symtablestack;
         i:=0;
         while assigned(p) do
           begin
              inc(i);
              writeln(i,' ',p^.name^);
              p:=p^.next;
              if i>500 then
               Message(sym_f_internal_error_in_symtablestack);
           end;
      end;
{$endif DEBUG}


{****************************************************************************
                           Init/Done Symtable
****************************************************************************}

{$ifndef Delphi}
{$ifdef tp}
   procedure do_streamerror;
     begin
       if symbolstream.status=-2 then
        WriteLn('Error: Not enough EMS memory')
       else
        WriteLn('Error: EMS Error ',symbolstream.status);
       halt(1);
     end;
{$endif TP}
{$endif Delphi}

   procedure InitSymtable;
     begin
{$ifndef Delphi}
{$ifdef TP}
     { Allocate stream }
        if use_big then
         begin
           streamerror:=@do_streamerror;
         { symbolstream.init('TMPFILE',stcreate,16000); }
         {$ifndef dpmi}
           symbolstream.init(10000,4000000); {using ems streams}
         {$else}
           symbolstream.init(1000000,16000); {using memory streams}
         {$endif}
           if symbolstream.errorinfo=stiniterror then
            do_streamerror;
         { write something, because pos 0 means nil pointer }
           symbolstream.writestr(@inputfile);
         end;
{$endif tp}
{$endif Delphi}
      { Reset symbolstack }
        registerdef:=false;
        read_member:=false;
        symtablestack:=nil;
        systemunit:=nil;
{$ifdef GDB}
        firstglobaldef:=nil;
        lastglobaldef:=nil;
{$endif GDB}
        globaltypecount:=1;
        pglobaltypecount:=@globaltypecount;
     { create error syms and def }
        generrorsym:=new(perrorsym,init);
        generrordef:=new(perrordef,init);
{$ifdef UNITALIASES}
     { unit aliases }
        unitaliases:=new(pdictionary,init);
{$endif}
     end;


   procedure DoneSymtable;
      begin
        dispose(generrorsym,done);
        dispose(generrordef,done);
{$ifdef UNITALIASES}
        dispose(unitaliases,done);
{$endif}
{$ifndef Delphi}
{$ifdef TP}
      { close the stream }
        if use_big then
         symbolstream.done;
{$endif}
{$endif Delphi}
     end;

end.
{
  $Log$
  Revision 1.58  1999-11-06 14:34:28  peter
    * truncated log to 20 revs

  Revision 1.57  1999/11/05 17:18:03  pierre
    * local browsing works at first level
      ie for function defined in interface or implementation
      not yet for functions inside other functions

  Revision 1.56  1999/11/04 23:13:25  peter
    * moved unit alias support into ifdef

  Revision 1.55  1999/11/04 10:54:02  peter
    + -Ua<oldname>=<newname> unit alias support

  Revision 1.54  1999/10/26 12:30:46  peter
    * const parameter is now checked
    * better and generic check if a node can be used for assigning
    * export fixes
    * procvar equal works now (it never had worked at least from 0.99.8)
    * defcoll changed to linkedlist with pparaitem so it can easily be
      walked both directions

  Revision 1.53  1999/10/06 17:39:15  peter
    * fixed stabs writting for forward types

  Revision 1.52  1999/10/03 19:44:42  peter
    * removed objpasunit reference, tvarrec is now searched in systemunit
      where it already was located

  Revision 1.51  1999/10/01 08:02:49  peter
    * forward type declaration rewritten

  Revision 1.50  1999/09/28 20:48:25  florian
    * fixed bug 610
    + added $D- for TP in symtable.pas else it can't be compiled anymore
      (too much symbols :()

  Revision 1.49  1999/09/27 23:44:59  peter
    * procinfo is now a pointer
    * support for result setting in sub procedure

  Revision 1.48  1999/09/12 21:35:38  florian
    * fixed a crash under Linux. Why doesn't have the damned Windows DPMI nil pointer
      protection???

  Revision 1.47  1999/09/12 08:48:09  florian
    * bugs 593 and 607 fixed
    * some other potential bugs with array constructors fixed
    * for classes compiled in $M+ and it's childs, the default access method
      is now published
    * fixed copyright message (it is now 1993-99)

  Revision 1.46  1999/09/10 18:48:10  florian
    * some bug fixes (e.g. must_be_valid and procinfo^.funcret_is_valid)
    * most things for stored properties fixed

  Revision 1.45  1999/09/08 08:05:44  peter
    * fixed bug 248

  Revision 1.44  1999/08/31 15:46:21  pierre
    * do_crc must be false for all browser stuff
    + tmacrosym defined_at_startup set in def_macro and set_macro

  Revision 1.43  1999/08/27 10:39:24  pierre
   * uf_local_browser made problem when computing interface CRC

  Revision 1.42  1999/08/13 21:33:13  peter
    * support for array constructors extended and more error checking

  Revision 1.41  1999/08/13 14:24:22  pierre
    + stabs for classes and classref working,
      a class still needs an ^ to get that content of it,
      but the class fields inside a class don't result into an
      infinite loop anymore!

  Revision 1.40  1999/08/10 16:25:42  pierre
   * unitid changed to word

  Revision 1.39  1999/08/10 12:33:36  pierre
   * pprocsym defined earlier for use in tprocdef

  Revision 1.38  1999/08/05 16:53:18  peter
    * V_Fatal=1, all other V_ are also increased
    * Check for local procedure when assigning procvar
    * fixed comment parsing because directives
    * oldtp mode directives better supported
    * added some messages to errore.msg

}