freepascal.compiler/compiler/aasm.pas

{
    $Id$
    Copyright (c) 1998-2000 by Florian Klaempfl

    This unit implements an abstract asmoutput class for all processor types

    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 aasm;

{$i defines.inc}

interface

    uses
       cutils,cclasses,
       globtype,globals,systems;

    type
       tait = (
          ait_none,
          ait_direct,
          ait_string,
          ait_label,
          ait_comment,
          ait_instruction,
          ait_datablock,
          ait_symbol,
          ait_symbol_end, { needed to calc the size of a symbol }
          ait_const_32bit,
          ait_const_16bit,
          ait_const_8bit,
          ait_const_symbol,
          ait_real_80bit,
          ait_real_64bit,
          ait_real_32bit,
          ait_comp_64bit,
          ait_align,
          ait_section,
          { the following is only used by the win32 version of the compiler }
          { and only the GNU AS Win32 is able to write it                   }
          ait_const_rva,
          ait_stabn,
          ait_stabs,
          ait_force_line,
          ait_stab_function_name,
          ait_cut, { used to split into tiny assembler files }
          ait_regalloc, { for register,temp allocation debugging }
          ait_tempalloc,
          ait_marker,

          { the follow is for the DEC Alpha }
          ait_frame,
          ait_ent,
{$ifdef m68k}
          ait_labeled_instruction,
{$endif m68k}
{$ifdef ia64}
          ait_bundle,
          ait_stop,
{$endif ia64}
          { never used, makes insertation of new ait_ easier to type }
          { lazy guy !!!! ;-) (FK) }
          ait_dummy);

       tcpuflags = (cf_64bitaddr);
       tcpuflagset = set of tcpuflags;

{ ait_* types which don't result in executable code or which don't influence   }
{ the way the program runs/behaves, but which may be encountered by the        }
{ optimizer (= if it's sometimes added to the exprasm list). Update if you add }
{ a new ait type!                                                              }
    const
      SkipInstr = [ait_comment, ait_symbol,ait_force_line,ait_section
{$ifdef GDB}
                   ,ait_stabs, ait_stabn, ait_stab_function_name
{$endif GDB}
                   ,ait_regalloc, ait_tempalloc, ait_symbol_end
  ];


  { asm symbol functions }
    type
       TAsmsymbind=(AB_NONE,AB_EXTERNAL,AB_COMMON,AB_LOCAL,AB_GLOBAL);

       TAsmsymtype=(AT_NONE,AT_FUNCTION,AT_DATA,AT_SECTION);

       tasmsymbol = class(TNamedIndexItem)
         defbind,
         bind      : TAsmsymbind;
         typ       : TAsmsymtype;
         { the next fields are filled in the binary writer }
         section : tsection;
         idx     : longint;
         address,
         size    : longint;
         { this need to be incremented with every symbol loading into the
           paasmoutput, thus in loadsym/loadref/const_symbol (PFV) }
         refs    : longint;
         { alternate symbol which can be used for 'renaming' needed for
           inlining }
         altsymbol : tasmsymbol;
         { is the symbol local for a procedure/function }
         proclocal : boolean;
         { is the symbol in the used list }
         inusedlist : boolean;
         { assembler pass label is set, used for detecting multiple labels }
         pass : byte;
         constructor create(const s:string;_bind:TAsmsymbind;_typ:Tasmsymtype);
         procedure reset;
         function  is_used:boolean;
         procedure setaddress(_pass:byte;sec:tsection;offset,len:longint);
         procedure GenerateAltSymbol;
       end;

       tasmlabel = class(tasmsymbol)
{$ifdef PACKENUMFIXED}
         { this is set by the tai_label.Init }
         is_set,
         { is the label only there for getting an address (e.g. for i/o }
         { checks -> true) or is it a jump target (false)               }
         is_addr : boolean;
{$endif}
         labelnr : longint;
{$ifndef PACKENUMFIXED}
         is_set,
         is_addr : boolean;
{$endif}
         constructor create;
         constructor createdata;
         constructor createaddr;
         function getname:string;override;
       end;


       { the short name makes typing easier }
       tai = class(tlinkedlistitem)
{$ifndef PACKENUMFIXED}
          typ      : tait;
{$endif}
          { pointer to record with optimizer info about this tai object }
          optinfo  : pointer;
          fileinfo : tfileposinfo;
{$ifdef PACKENUMFIXED}
          { still 3 bytes left after the next field }
          typ      : tait;
{$endif}
          constructor Create;
       end;

       tai_string = class(tai)
          str : pchar;
          { extra len so the string can contain an \0 }
          len : longint;
          constructor Create(const _str : string);
          constructor Create_pchar(_str : pchar);
          constructor Create_length_pchar(_str : pchar;length : longint);
          destructor Destroy;override;
       end;

       { generates a common label }
       tai_symbol = class(tai)
{$ifdef PACKENUMFIXED}
          is_global : boolean;
{$endif}
          sym : tasmsymbol;
          size : longint;
{$ifndef PACKENUMFIXED}
          is_global : boolean;
{$endif}
          constructor Create(_sym:tasmsymbol;siz:longint);
          constructor Createname(const _name : string;siz:longint);
          constructor Createname_global(const _name : string;siz:longint);
          constructor Createdataname(const _name : string;siz:longint);
          constructor Createdataname_global(const _name : string;siz:longint);
       end;

       tai_symbol_end = class(tai)
          sym : tasmsymbol;
          constructor Create(_sym:tasmsymbol);
          constructor Createname(const _name : string);
       end;

       tai_label = class(tai)
{$ifdef PACKENUMFIXED}
          is_global : boolean;
{$endif}
          l : tasmlabel;
{$ifndef PACKENUMFIXED}
          is_global : boolean;
{$endif}
          constructor Create(_l : tasmlabel);
       end;

       tai_direct = class(tai)
          str : pchar;
          constructor Create(_str : pchar);
          destructor Destroy; override;
       end;

       { to insert a comment into the generated assembler file }
       tai_asm_comment = class(tai)
          str : pchar;
          constructor Create(_str : pchar);
          destructor Destroy; override;
       end;


       { alignment for operator }
{$ifdef i386}
       tai_align_abstract = class(tai)
{$else i386}
       tai_align = class(tai)
{$endif i386}
          buf       : array[0..63] of char; { buf used for fill }
          aligntype : byte;   { 1 = no align, 2 = word align, 4 = dword align }
          fillsize  : byte;   { real size to fill }
          fillop    : byte;   { value to fill with - optional }
          use_op    : boolean;
          constructor Create(b:byte);
          constructor Create_op(b: byte; _op: byte);
          function getfillbuf:pchar;
       end;

       { Insert a section/segment directive }
       tai_section = class(tai)
          sec : tsection;
          constructor Create(s : tsection);
       end;


       { generates an uninitializised data block }
       tai_datablock = class(tai)
{$ifdef PACKENUMFIXED}
          is_global : boolean;
{$endif}
          sym  : tasmsymbol;
          size : longint;
{$ifndef PACKENUMFIXED}
          is_global : boolean;
{$endif}
          constructor Create(const _name : string;_size : longint);
          constructor Create_global(const _name : string;_size : longint);
       end;


       { generates a long integer (32 bit) }
       tai_const = class(tai)
          value : longint;
          constructor Create_32bit(_value : longint);
          constructor Create_16bit(_value : word);
          constructor Create_8bit(_value : byte);
       end;

       tai_const_symbol = class(tai)
          sym    : tasmsymbol;
          offset : longint;
          constructor Create(_sym:tasmsymbol);
          constructor Create_offset(_sym:tasmsymbol;ofs:longint);
          constructor Create_rva(_sym:tasmsymbol);
          constructor Createname(const name:string);
          constructor Createname_offset(const name:string;ofs:longint);
          constructor Createname_rva(const name:string);
       end;

       { generates a single (32 bit real) }
       tai_real_32bit = class(tai)
          value : ts32real;
          constructor Create(_value : ts32real);
       end;

       { generates a double (64 bit real) }
       tai_real_64bit = class(tai)
          value : ts64real;
          constructor Create(_value : ts64real);
       end;

       { generates an extended (80 bit real) }
       tai_real_80bit = class(tai)
          value : ts80real;
          constructor Create(_value : ts80real);
       end;

       { generates an comp (integer over 64 bits) }
       tai_comp_64bit = class(tai)
          value : ts64comp;
          constructor Create(_value : ts64comp);
       end;

       { insert a cut to split into several smaller files }

       tcutplace=(cut_normal,cut_begin,cut_end);

       tai_cut = class(tai)
          place : tcutplace;
          constructor Create;
          constructor Create_begin;
          constructor Create_end;
       end;

       TMarker = (NoPropInfoStart, NoPropInfoEnd,
         AsmBlockStart, AsmBlockEnd,
         InlineStart,InlineEnd
       );

       tai_marker = class(tai)
         Kind: TMarker;
         Constructor Create(_Kind: TMarker);
       end;

       taitempalloc = class(tai)
{$ifdef PACKENUMFIXED}
          allocation : boolean;
{$endif}
          temppos,
          tempsize   : longint;
{$ifndef PACKENUMFIXED}
          allocation : boolean;
{$endif}
          constructor alloc(pos,size:longint);
          constructor dealloc(pos,size:longint);
       end;

{ for each processor define the best precision }
{ bestreal is defined in globals }
{$ifdef i386}
const
       ait_bestreal = ait_real_80bit;
type
       tai_bestreal = tai_real_80bit;
{$endif i386}
{$ifdef m68k}
const
       ait_bestreal = ait_real_32bit;
type
       tai_bestreal = tai_real_32bit;
{$endif m68k}

       taasmoutput = class(tlinkedlist)
         function getlasttaifilepos : pfileposinfo;
       end;

    const
    { maximum of aasmoutput lists there will be }
      maxoutputlists = 10;

    var
    { temporary lists }
      exprasmlist,
    { default lists }
      datasegment,codesegment,bsssegment,
      debuglist,withdebuglist,consts,
      importssection,exportssection,
      resourcesection,rttilist,
      resourcestringlist         : taasmoutput;
    { asm symbol list }
      asmsymbollist : tdictionary;
      usedasmsymbollist : tsinglelist;

    const
      nextaltnr   : longint = 1;
      nextlabelnr : longint = 1;
      countlabelref : boolean = true;

    { make l as a new label }
    procedure getlabel(var l : tasmlabel);
    { make l as a new label and flag is_addr }
    procedure getaddrlabel(var l : tasmlabel);
    { make l as a new label and flag is_data }
    procedure getdatalabel(var l : tasmlabel);
    {just get a label number }
    procedure getlabelnr(var l : longint);

    function  newasmsymbol(const s : string) : tasmsymbol;
    function  newasmsymboltype(const s : string;_bind:TAsmSymBind;_typ:TAsmsymtype) : tasmsymbol;
    function  getasmsymbol(const s : string) : tasmsymbol;
    function  renameasmsymbol(const sold, snew : string):tasmsymbol;

    procedure CreateUsedAsmSymbolList;
    procedure DestroyUsedAsmSymbolList;
    procedure UsedAsmSymbolListInsert(p:tasmsymbol);
    procedure UsedAsmSymbolListReset;
    procedure UsedAsmSymbolListResetAltSym;
    procedure UsedAsmSymbolListCheckUndefined;


implementation

uses
{$ifdef delphi}
  sysutils,
{$else}
  strings,
{$endif}
  fmodule,verbose;

{****************************************************************************
                             TAI
 ****************************************************************************}

    constructor tai.Create;
      begin
        optinfo := nil;
        fileinfo:=aktfilepos;
      end;

{****************************************************************************
                             TAI_SECTION
 ****************************************************************************}

    constructor tai_section.Create(s : tsection);
      begin
         inherited Create;
         typ:=ait_section;
         sec:=s;
      end;


{****************************************************************************
                             TAI_DATABLOCK
 ****************************************************************************}

    constructor tai_datablock.Create(const _name : string;_size : longint);

      begin
         inherited Create;
         typ:=ait_datablock;
         sym:=newasmsymboltype(_name,AB_LOCAL,AT_DATA);
         { keep things aligned }
         if _size<=0 then
           _size:=4;
         size:=_size;
         is_global:=false;
      end;


    constructor tai_datablock.Create_global(const _name : string;_size : longint);
      begin
         inherited Create;
         typ:=ait_datablock;
         sym:=newasmsymboltype(_name,AB_GLOBAL,AT_DATA);
         { keep things aligned }
         if _size<=0 then
           _size:=4;
         size:=_size;
         is_global:=true;
      end;


{****************************************************************************
                               TAI_SYMBOL
 ****************************************************************************}

    constructor tai_symbol.Create(_sym:tasmsymbol;siz:longint);
      begin
         inherited Create;
         typ:=ait_symbol;
         sym:=_sym;
         size:=siz;
         is_global:=(sym.defbind=AB_GLOBAL);
      end;

    constructor tai_symbol.Createname(const _name : string;siz:longint);
      begin
         inherited Create;
         typ:=ait_symbol;
         sym:=newasmsymboltype(_name,AB_LOCAL,AT_FUNCTION);
         size:=siz;
         is_global:=false;
      end;

    constructor tai_symbol.Createname_global(const _name : string;siz:longint);
      begin
         inherited Create;
         typ:=ait_symbol;
         sym:=newasmsymboltype(_name,AB_GLOBAL,AT_FUNCTION);
         size:=siz;
         is_global:=true;
      end;

    constructor tai_symbol.Createdataname(const _name : string;siz:longint);
      begin
         inherited Create;
         typ:=ait_symbol;
         sym:=newasmsymboltype(_name,AB_LOCAL,AT_DATA);
         size:=siz;
         is_global:=false;
      end;

    constructor tai_symbol.Createdataname_global(const _name : string;siz:longint);
      begin
         inherited Create;
         typ:=ait_symbol;
         sym:=newasmsymboltype(_name,AB_GLOBAL,AT_DATA);
         size:=siz;
         is_global:=true;
      end;


{****************************************************************************
                               TAI_SYMBOL
 ****************************************************************************}

    constructor tai_symbol_end.Create(_sym:tasmsymbol);
      begin
         inherited Create;
         typ:=ait_symbol_end;
         sym:=_sym;
      end;

    constructor tai_symbol_end.Createname(const _name : string);
      begin
         inherited Create;
         typ:=ait_symbol_end;
         sym:=newasmsymboltype(_name,AB_GLOBAL,AT_NONE);
      end;


{****************************************************************************
                               TAI_CONST
 ****************************************************************************}

    constructor tai_const.Create_32bit(_value : longint);

      begin
         inherited Create;
         typ:=ait_const_32bit;
         value:=_value;
      end;

    constructor tai_const.Create_16bit(_value : word);

      begin
         inherited Create;
         typ:=ait_const_16bit;
         value:=_value;
      end;

    constructor tai_const.Create_8bit(_value : byte);

      begin
         inherited Create;
         typ:=ait_const_8bit;
         value:=_value;
      end;


{****************************************************************************
                               TAI_CONST_SYMBOL_OFFSET
 ****************************************************************************}

    constructor tai_const_symbol.Create(_sym:tasmsymbol);
      begin
         inherited Create;
         typ:=ait_const_symbol;
         sym:=_sym;
         offset:=0;
         { update sym info }
         inc(sym.refs);
      end;

    constructor tai_const_symbol.Create_offset(_sym:tasmsymbol;ofs:longint);
      begin
         inherited Create;
         typ:=ait_const_symbol;
         sym:=_sym;
         offset:=ofs;
         { update sym info }
         inc(sym.refs);
      end;

    constructor tai_const_symbol.Create_rva(_sym:tasmsymbol);
      begin
         inherited Create;
         typ:=ait_const_rva;
         sym:=_sym;
         offset:=0;
         { update sym info }
         inc(sym.refs);
      end;

    constructor tai_const_symbol.Createname(const name:string);
      begin
         inherited Create;
         typ:=ait_const_symbol;
         sym:=newasmsymbol(name);
         offset:=0;
         { update sym info }
         inc(sym.refs);
      end;

    constructor tai_const_symbol.Createname_offset(const name:string;ofs:longint);
      begin
         inherited Create;
         typ:=ait_const_symbol;
         sym:=newasmsymbol(name);
         offset:=ofs;
         { update sym info }
         inc(sym.refs);
      end;

    constructor tai_const_symbol.Createname_rva(const name:string);
      begin
         inherited Create;
         typ:=ait_const_rva;
         sym:=newasmsymbol(name);
         offset:=0;
         { update sym info }
         inc(sym.refs);
      end;


{****************************************************************************
                               TAI_real_32bit
 ****************************************************************************}

    constructor tai_real_32bit.Create(_value : ts32real);

      begin
         inherited Create;
         typ:=ait_real_32bit;
         value:=_value;
      end;

{****************************************************************************
                               TAI_real_64bit
 ****************************************************************************}

    constructor tai_real_64bit.Create(_value : ts64real);

      begin
         inherited Create;
         typ:=ait_real_64bit;
         value:=_value;
      end;

{****************************************************************************
                               TAI_real_80bit
 ****************************************************************************}

    constructor tai_real_80bit.Create(_value : ts80real);

      begin
         inherited Create;
         typ:=ait_real_80bit;
         value:=_value;
      end;

{****************************************************************************
                               Tai_comp_64bit
 ****************************************************************************}

    constructor tai_comp_64bit.Create(_value : ts64comp);

      begin
         inherited Create;
         typ:=ait_comp_64bit;
         value:=_value;
      end;


{****************************************************************************
                               TAI_STRING
 ****************************************************************************}

     constructor tai_string.Create(const _str : string);

       begin
          inherited Create;
          typ:=ait_string;
          getmem(str,length(_str)+1);
          strpcopy(str,_str);
          len:=length(_str);
       end;

     constructor tai_string.Create_pchar(_str : pchar);

       begin
          inherited Create;
          typ:=ait_string;
          str:=_str;
          len:=strlen(_str);
       end;

    constructor tai_string.Create_length_pchar(_str : pchar;length : longint);

       begin
          inherited Create;
          typ:=ait_string;
          str:=_str;
          len:=length;
       end;

    destructor tai_string.destroy;

      begin
         { you can have #0 inside the strings so }
         if str<>nil then
           freemem(str,len+1);
         inherited Destroy;
      end;


{****************************************************************************
                               TAI_LABEL
 ****************************************************************************}

    constructor tai_label.create(_l : tasmlabel);
      begin
        inherited Create;
        typ:=ait_label;
        l:=_l;
        l.is_set:=true;
        is_global:=(l.defbind=AB_GLOBAL);
      end;


{****************************************************************************
                              TAI_DIRECT
 ****************************************************************************}

     constructor tai_direct.Create(_str : pchar);

       begin
          inherited Create;
          typ:=ait_direct;
          str:=_str;
       end;

    destructor tai_direct.destroy;

      begin
         strdispose(str);
         inherited Destroy;
      end;

{****************************************************************************
          TAI_ASM_COMMENT  comment to be inserted in the assembler file
 ****************************************************************************}

     constructor tai_asm_comment.Create(_str : pchar);

       begin
          inherited Create;
          typ:=ait_comment;
          str:=_str;
       end;

    destructor tai_asm_comment.destroy;

      begin
         strdispose(str);
         inherited Destroy;
      end;

{****************************************************************************
                              TAI_ALIGN
 ****************************************************************************}

{$ifdef i386}
     constructor tai_align_abstract.Create(b: byte);
{$else i386}
     constructor tai_align.Create(b: byte);
{$endif i386}
       begin
          inherited Create;
          typ:=ait_align;
          if b in [1,2,4,8,16,32] then
            aligntype := b
          else
            aligntype := 1;
          fillsize:=0;
          fillop:=0;
          use_op:=false;
       end;


{$ifdef i386}
     constructor tai_align_abstract.Create_op(b: byte; _op: byte);
{$else i386}
     constructor tai_align.Create_op(b: byte; _op: byte);
{$endif i386}
       begin
          inherited Create;
          typ:=ait_align;
          if b in [1,2,4,8,16,32] then
            aligntype := b
          else
            aligntype := 1;
          fillsize:=0;
          fillop:=_op;
          use_op:=true;
          fillchar(buf,sizeof(buf),_op)
       end;


{$ifdef i386}
     function tai_align_abstract.getfillbuf:pchar;
{$else i386}
     function tai_align.getfillbuf:pchar;
{$endif i386}
       begin
         getfillbuf:=@buf;
       end;

{****************************************************************************
                              TAI_CUT
 ****************************************************************************}

     constructor tai_cut.Create;
       begin
          inherited Create;
          typ:=ait_cut;
          place:=cut_normal;
       end;


     constructor tai_cut.Create_begin;
       begin
          inherited Create;
          typ:=ait_cut;
          place:=cut_begin;
       end;


     constructor tai_cut.Create_end;
       begin
          inherited Create;
          typ:=ait_cut;
          place:=cut_end;
       end;


{****************************************************************************
                             Tai_Marker
 ****************************************************************************}

     Constructor Tai_Marker.Create(_Kind: TMarker);
     Begin
       Inherited Create;
       typ := ait_marker;
       Kind := _Kind;
     End;

{*****************************************************************************
                                TaiTempAlloc
*****************************************************************************}

    constructor taitempalloc.alloc(pos,size:longint);
      begin
        inherited Create;
        typ:=ait_tempalloc;
        allocation:=true;
        temppos:=pos;
        tempsize:=size;
      end;


    constructor taitempalloc.dealloc(pos,size:longint);
      begin
        inherited Create;
        typ:=ait_tempalloc;
        allocation:=false;
        temppos:=pos;
        tempsize:=size;
      end;



{*****************************************************************************
                                  AsmSymbol
*****************************************************************************}

    constructor tasmsymbol.create(const s:string;_bind:TAsmsymbind;_typ:Tasmsymtype);
      begin;
        inherited createname(s);
        reset;
        defbind:=_bind;
        typ:=_typ;
        inusedlist:=false;
        pass:=255;
        { mainly used to remove unused labels from the codesegment }
        refs:=0;
      end;

    procedure tasmsymbol.GenerateAltSymbol;
      begin
        if not assigned(altsymbol) then
         begin
           altsymbol:=tasmsymbol.create(name+'_'+tostr(nextaltnr),bind,typ);
           { also copy the amount of references }
           altsymbol.refs:=refs;
           inc(nextaltnr);
         end;
      end;

    procedure tasmsymbol.reset;
      begin
        { reset section info }
        section:=sec_none;
        address:=0;
        size:=0;
        idx:=-1;
        pass:=255;
        bind:=AB_EXTERNAL;
        proclocal:=false;
      end;

    function tasmsymbol.is_used:boolean;
      begin
        is_used:=(refs>0);
      end;

    procedure tasmsymbol.setaddress(_pass:byte;sec:tsection;offset,len:longint);
      begin
        if (_pass=pass) then
         begin
           Message1(asmw_e_duplicate_label,name);
           exit;
         end;
        pass:=_pass;
        section:=sec;
        address:=offset;
        size:=len;
        { when the bind was reset to External, set it back to the default
          bind it got when defined }
        if (bind=AB_EXTERNAL) and (defbind<>AB_NONE) then
         bind:=defbind;
      end;


{*****************************************************************************
                                  AsmLabel
*****************************************************************************}

    constructor tasmlabel.create;
      begin;
        labelnr:=nextlabelnr;
        inc(nextlabelnr);
        inherited create(target_asm.labelprefix+tostr(labelnr),AB_LOCAL,AT_FUNCTION);
        proclocal:=true;
        is_set:=false;
        is_addr := false;
      end;


    constructor tasmlabel.createdata;
      begin;
        labelnr:=nextlabelnr;
        inc(nextlabelnr);
        if (cs_create_smart in aktmoduleswitches) or
           target_asm.labelprefix_only_inside_procedure then
          inherited create('_$'+current_module.modulename^+'$_L'+tostr(labelnr),AB_GLOBAL,AT_DATA)
        else
          inherited create(target_asm.labelprefix+tostr(labelnr),AB_LOCAL,AT_DATA);
        is_set:=false;
        is_addr := false;
        { write it always }
        refs:=1;
      end;

    constructor tasmlabel.createaddr;
      begin;
        create;
        is_addr := true;
      end;

    function tasmlabel.getname:string;
      begin
        getname:=inherited getname;
        inc(refs);
      end;


{*****************************************************************************
                              AsmSymbolList helpers
*****************************************************************************}

    function newasmsymbol(const s : string) : tasmsymbol;
      var
        hp : tasmsymbol;
      begin
        hp:=tasmsymbol(asmsymbollist.search(s));
        if not assigned(hp) then
         begin
           { Not found, insert it as an External }
           hp:=tasmsymbol.create(s,AB_EXTERNAL,AT_FUNCTION);
           asmsymbollist.insert(hp);
         end;
        newasmsymbol:=hp;
      end;


    function newasmsymboltype(const s : string;_bind:TAsmSymBind;_typ:Tasmsymtype) : tasmsymbol;
      var
        hp : tasmsymbol;
      begin
        hp:=tasmsymbol(asmsymbollist.search(s));
        if assigned(hp) then
         hp.defbind:=_bind
        else
         begin
           { Not found, insert it as an External }
           hp:=tasmsymbol.create(s,_bind,_typ);
           asmsymbollist.insert(hp);
         end;
        newasmsymboltype:=hp;
      end;


    function getasmsymbol(const s : string) : tasmsymbol;
      begin
        getasmsymbol:=tasmsymbol(asmsymbollist.search(s));
      end;


    { renames an asmsymbol }
    function renameasmsymbol(const sold, snew : string):tasmsymbol;
      begin
        renameasmsymbol:=tasmsymbol(asmsymbollist.rename(sold,snew));
      end;


{*****************************************************************************
                              Used AsmSymbolList
*****************************************************************************}

    procedure CreateUsedAsmSymbolList;
      begin
        if assigned(usedasmsymbollist) then
         internalerror(78455782);
        usedasmsymbollist:=TSingleList.create;
      end;


    procedure DestroyUsedAsmSymbolList;
      begin
        usedasmsymbollist.destroy;
        usedasmsymbollist:=nil;
      end;


    procedure UsedAsmSymbolListInsert(p:tasmsymbol);
      begin
        if not p.inusedlist then
         usedasmsymbollist.insert(p);
        p.inusedlist:=true;
      end;


    procedure UsedAsmSymbolListReset;
      var
        hp : tasmsymbol;
      begin
        hp:=tasmsymbol(usedasmsymbollist.first);
        while assigned(hp) do
         begin
           with hp do
            begin
              reset;
              inusedlist:=false;
            end;
           hp:=tasmsymbol(hp.listnext);
         end;
      end;


    procedure UsedAsmSymbolListResetAltSym;
      var
        hp : tasmsymbol;
      begin
        hp:=tasmsymbol(usedasmsymbollist.first);
        while assigned(hp) do
         begin
           with hp do
            begin
              altsymbol:=nil;
              inusedlist:=false;
            end;
           hp:=tasmsymbol(hp.listnext);
         end;
      end;


    procedure UsedAsmSymbolListCheckUndefined;
      var
        hp : tasmsymbol;
      begin
        hp:=tasmsymbol(usedasmsymbollist.first);
        while assigned(hp) do
         begin
           with hp do
            begin
              if (refs>0) and
                 (section=Sec_none) and
                 not(bind in [AB_EXTERNAL,AB_COMMON]) then
               Message1(asmw_e_undefined_label,name);
            end;
           hp:=tasmsymbol(hp.listnext);
         end;
      end;


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

    procedure getlabel(var l : tasmlabel);
      begin
        l:=tasmlabel.create;
        asmsymbollist.insert(l);
      end;


    procedure getdatalabel(var l : tasmlabel);
      begin
        l:=tasmlabel.createdata;
        asmsymbollist.insert(l);
      end;

    procedure getaddrlabel(var l : tasmlabel);
      begin
        l:=tasmlabel.createaddr;
        asmsymbollist.insert(l);
      end;

    procedure getlabelnr(var l : longint);
      begin
         l:=nextlabelnr;
         inc(nextlabelnr);
      end;


{*****************************************************************************
                                 TAAsmOutput
*****************************************************************************}

    function taasmoutput.getlasttaifilepos : pfileposinfo;
      begin
         if assigned(last) then
           getlasttaifilepos:=@tai(last).fileinfo
         else
           getlasttaifilepos:=nil;
      end;

end.
{
  $Log$
  Revision 1.18  2001-08-30 19:43:50  peter
    * detect duplicate labels

  Revision 1.17  2001/04/13 01:22:06  peter
    * symtable change to classes
    * range check generation and errors fixed, make cycle DEBUG=1 works
    * memory leaks fixed

  Revision 1.16  2001/02/20 21:36:39  peter
    * tasm/masm fixes merged

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

  Revision 1.14  2000/11/29 00:30:30  florian
    * unused units removed from uses clause
    * some changes for widestrings

  Revision 1.13  2000/09/24 15:06:10  peter
    * use defines.inc

  Revision 1.12  2000/08/27 20:19:38  peter
    * store strings with case in ppu, when an internal symbol is created
      a '$' is prefixed so it's not automatic uppercased

  Revision 1.11  2000/08/27 16:11:48  peter
    * moved some util functions from globals,cobjects to cutils
    * splitted files into finput,fmodule

  Revision 1.10  2000/08/20 17:38:21  peter
    * smartlinking fixed for linux (merged)

  Revision 1.9  2000/08/16 18:33:53  peter
    * splitted namedobjectitem.next into indexnext and listnext so it
      can be used in both lists
    * don't allow "word = word" type definitions (merged)

  Revision 1.8  2000/08/12 19:14:58  peter
    * ELF writer works now also with -g
    * ELF writer is default again for linux

  Revision 1.7  2000/08/12 15:34:21  peter
    + usedasmsymbollist to check and reset only the used symbols (merged)

  Revision 1.6  2000/08/09 19:49:44  peter
    * packenumfixed things so it compiles with 1.0.0 again

  Revision 1.5  2000/08/05 13:25:06  peter
    * packenum 1 fixes (merged)

  Revision 1.4  2000/07/21 15:14:01  jonas
    + added is_addr field for labels, if they are only used for getting the address
       (e.g. for io checks) and corresponding getaddrlabel() procedure

  Revision 1.3  2000/07/13 12:08:24  michael
  + patched to 1.1.0 with former 1.09patch from peter

  Revision 1.2  2000/07/13 11:32:28  michael
  + removed logs

}