freepascal.compiler/compiler/aasmtai.pas

{
    $Id$
    Copyright (c) 1998-2002 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.

 ****************************************************************************
}
{ @abstract(This unit implements an abstract asm output class for all processor types)
  This unit implements an abstract assembler output class for all processors, these
  are then overriden for each assembler writer to actually write the data in these
  classes to an assembler file.
}

unit aasmtai;

{$i fpcdefs.inc}

interface

    uses
       cutils,cclasses,
       globtype,globals,systems,
       cpuinfo,cpubase,
       symppu,
       aasmbase;

    type
       taitype = (
          ait_none,
          ait_align,
          ait_section,
          ait_comment,
          ait_direct,
          ait_string,
          ait_instruction,
          ait_datablock,
          ait_symbol,
          ait_symbol_end, { needed to calc the size of a symbol }
          ait_label,
          ait_const_32bit,
          ait_const_16bit,
          ait_const_8bit,
          ait_const_symbol,
          { 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_real_32bit,
          ait_real_64bit,
          ait_real_80bit,
          ait_comp_64bit,
{$ifdef GDB}
          ait_stabn,
          ait_stabs,
          ait_force_line,
          ait_stab_function_name,
{$endif GDB}
{$ifdef alpha}
          { the follow is for the DEC Alpha }
          ait_frame,
          ait_ent,
{$endif alpha}
{$ifdef ia64}
          ait_bundle,
          ait_stop,
{$endif ia64}
{$ifdef m68k}
          ait_labeled_instruction,
{$endif m68k}
{$ifdef SPARC}
          ait_labeled_instruction,
{$endif SPARC}
          ait_cut, { used to split into tiny assembler files }
          ait_regalloc,
          ait_tempalloc,
          ait_marker { used to mark assembler blocks and inlined functions }
          );

    const
       taitypestr : array[taitype] of string[14] = (
          '<none>',
          'align',
          'section',
          'comment',
          'direct',
          'string',
          'instruction',
          'datablock',
          'symbol',
          'symbol_end',
          'label',
          'const_32bit',
          'const_16bit',
          'const_8bit',
          'const_symbol',
          'const_rva',
          'real_32bit',
          'real_64bit',
          'real_80bit',
          'comp_64bit',
{$ifdef GDB}
          'stabn',
          'stabs',
          'force_line',
          'stab_funcname',
{$endif GDB}
{$ifdef alpha}
          { the follow is for the DEC Alpha }
          'frame',
          'ent',
{$endif alpha}
{$ifdef ia64}
          'bundle',
          'stop',
{$endif ia64}
{$ifdef m68k}
          'labeled_instr',
{$endif m68k}
{$ifdef SPARC}
          'labeled_instr',
{$endif SPARC}
          'cut',
          'regalloc',
          'tempalloc',
          'marker'
          );

{ 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_section
{$ifdef GDB}
                   ,ait_stabs, ait_stabn, ait_stab_function_name, ait_force_line
{$endif GDB}
                   ,ait_regalloc, ait_tempalloc, ait_symbol_end];

{ ait_* types which do not have line information (and hence which are of type
  tai, otherwise, they are of type tailineinfo }
{ ait_* types which do not have line information (and hence which are of type
  tai, otherwise, they are of type tailineinfo }
      SkipLineInfo =[ait_label,
                     ait_regalloc,ait_tempalloc,
{$ifdef GDB}
                  ait_stabn,ait_stabs,ait_stab_function_name,
{$endif GDB}
                  ait_cut,ait_marker,ait_align,ait_section,ait_comment,
                  ait_const_8bit,ait_const_16bit,ait_const_32bit,
                  ait_real_32bit,ait_real_64bit,ait_real_80bit,ait_comp_64bit
                  ];


    type
       { cut type, required for alphanumeric ordering of the assembler filenames }
       TCutPlace=(cut_normal,cut_begin,cut_end);

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

       { Buffer type used for alignment }
       tfillbuffer = array[0..63] of char;

       { abstract assembler item }
       tai = class(TLinkedListItem)
{$ifndef NOOPT}
          { pointer to record with optimizer info about this tai object }
          optinfo  : pointer;
{$endif NOOPT}
          typ      : taitype;
          constructor Create;
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);virtual;
          procedure ppuwrite(ppufile:tcompilerppufile);virtual;
          procedure derefimpl;virtual;
          { helper for checking symbol redefines }
          procedure checkredefinesym(sym:tasmsymbol);
       end;

       { abstract assembler item with line information }
       tailineinfo = class(tai)
        fileinfo : tfileposinfo;
        constructor Create;
        constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
        procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;
    

       taiclass = class of tai;

       taiclassarray = array[taitype] of taiclass;

       { Generates an assembler string }
       tai_string = class(tailineinfo)
          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;
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          function getcopy:tlinkedlistitem;override;
       end;

       { Generates a common label }
       tai_symbol = class(tailineinfo)
          is_global : boolean;
          sym       : tasmsymbol;
          size      : longint;
          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);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          procedure derefimpl;override;
       end;

       tai_symbol_end = class(tailineinfo)
          sym : tasmsymbol;
          constructor Create(_sym:tasmsymbol);
          constructor Createname(const _name : string);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          procedure derefimpl;override;
       end;

       { Generates an assembler label }
       tai_label = class(tai)
          is_global : boolean;
          l         : tasmlabel;
          constructor Create(_l : tasmlabel);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          procedure derefimpl;override;
       end;

       { Directly output data to final assembler file }
       tai_direct = class(tailineinfo)
          str : pchar;
          constructor Create(_str : pchar);
          destructor Destroy; override;
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          function getcopy:tlinkedlistitem;override;
       end;

       { Generates an assembler comment }
       tai_comment = class(tai)
          str : pchar;
          constructor Create(_str : pchar);
          destructor Destroy; override;
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          function getcopy:tlinkedlistitem;override;
       end;


       { Generates a section / segment directive }
       tai_section = class(tai)
          sec : TSection;
          constructor Create(s : TSection);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;


       { Generates an uninitializised data block }
       tai_datablock = class(tailineinfo)
          is_global : boolean;
          sym       : tasmsymbol;
          size      : longint;
          constructor Create(const _name : string;_size : longint);
          constructor Create_global(const _name : string;_size : longint);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          procedure derefimpl;override;
       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);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;

       tai_const_symbol = class(tailineinfo)
          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);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          procedure derefimpl;override;
          function getcopy:tlinkedlistitem;override;
       end;

       { Generates a single float (32 bit real) }
       tai_real_32bit = class(tai)
          value : ts32real;
          constructor Create(_value : ts32real);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;

       { Generates a double float (64 bit real) }
       tai_real_64bit = class(tai)
          value : ts64real;
          constructor Create(_value : ts64real);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;

       { Generates an extended float (80 bit real) }
       tai_real_80bit = class(tai)
          value : ts80real;
          constructor Create(_value : ts80real);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;

       { Generates a comp int (integer over 64 bits)

          This is Intel 80x86 specific, and is not
          really supported on other processors.
       }
       tai_comp_64bit = class(tai)
          value : ts64comp;
          constructor Create(_value : ts64comp);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;

       { Insert a cut to split assembler into several smaller files }
       tai_cut = class(tai)
          place : tcutplace;
          constructor Create;
          constructor Create_begin;
          constructor Create_end;
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;

       { Insert a marker for assembler and inline blocks }
       tai_marker = class(tai)
          Kind: TMarker;
          Constructor Create(_Kind: TMarker);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;

       tai_tempalloc = class(tai)
          allocation : boolean;
{$ifdef EXTDEBUG}
          problem : pstring;
{$endif EXTDEBUG}
          temppos,
          tempsize   : longint;
          constructor alloc(pos,size:longint);
          constructor dealloc(pos,size:longint);
{$ifdef EXTDEBUG}
          constructor allocinfo(pos,size:longint;const st:string);
{$endif EXTDEBUG}
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;

       tai_regalloc = class(tai)
          allocation : boolean;
          reg        : tregister;
          constructor alloc(r : tregister);
          constructor dealloc(r : tregister);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
       end;

       { Class template for assembler instructions
       }
       taicpu_abstract = class(tailineinfo)
       protected
          procedure ppuloadoper(ppufile:tcompilerppufile;var o:toper);virtual;abstract;
          procedure ppuwriteoper(ppufile:tcompilerppufile;const o:toper);virtual;abstract;
          procedure ppuderefoper(var o:toper);virtual;abstract;
       public
          { Condition flags for instruction }
          condition : TAsmCond;
          { Number of operands to instruction }
          ops       : byte;
          { Operands of instruction }
          oper      : array[0..max_operands-1] of toper;
          { Actual opcode of instruction }
          opcode    : tasmop;
{$ifdef i386}
          segprefix : tregister;
{$endif i386}
          { true if instruction is a jmp }
          is_jmp    : boolean; { is this instruction a jump? (needed for optimizer) }
          Constructor Create(op : tasmop);
          Destructor Destroy;override;
          function getcopy:TLinkedListItem;override;
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          procedure derefimpl;override;
          procedure SetCondition(const c:TAsmCond);
          procedure loadconst(opidx:longint;l:aword);
          procedure loadsymbol(opidx:longint;s:tasmsymbol;sofs:longint);
          procedure loadref(opidx:longint;const r:treference);
          procedure loadreg(opidx:longint;r:tregister);
          procedure loadoper(opidx:longint;o:toper);
       end;

       { alignment for operator }
       tai_align_abstract = class(tai)
          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);
          constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
          procedure ppuwrite(ppufile:tcompilerppufile);override;
          function calculatefillbuf(var buf : tfillbuffer):pchar;virtual;
       end;

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


    var
      { array with all class types for tais }
      aiclass : taiclassarray;
      { temporary lists }
      exprasmlist,
      { default lists }
      datasegment,codesegment,bsssegment,
      debuglist,withdebuglist,consts,
      importssection,exportssection,
      resourcesection,rttilist,
      resourcestringlist         : taasmoutput;


    function ppuloadai(ppufile:tcompilerppufile):tai;
    procedure ppuwriteai(ppufile:tcompilerppufile;n:tai);


implementation

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

    const
      pputaimarker = 254;


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

    function ppuloadai(ppufile:tcompilerppufile):tai;
      var
        b : byte;
        t : taitype;
      begin
        { marker }
        b:=ppufile.getbyte;
        if b<>pputaimarker then
          internalerror(200208181);
        { load nodetype }
        t:=taitype(ppufile.getbyte);
        if t<>ait_none then
         begin
           if t>high(taitype) then
             internalerror(200208182);
           if not assigned(aiclass[t]) then
             internalerror(200208183);
           //writeln('taiload: ',taitypestr[t]);
           { generate tai of the correct class }
           ppuloadai:=aiclass[t].ppuload(t,ppufile);
         end
        else
         ppuloadai:=nil;
      end;


    procedure ppuwriteai(ppufile:tcompilerppufile;n:tai);
      begin
        { marker, read by ppuloadnode }
        ppufile.putbyte(pputaimarker);
        if assigned(n) then
         begin
           { type, read by ppuloadnode }
           ppufile.putbyte(byte(n.typ));
           //writeln('taiwrite: ',taitypestr[n.typ]);
           n.ppuwrite(ppufile);
         end
        else
         ppufile.putbyte(byte(ait_none));
      end;


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

    constructor tai.Create;
      begin
{$ifndef NOOPT}
        optinfo:=nil;
{$endif NOOPT}
      end;


    constructor tai.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        typ:=t;
{$ifndef NOOPT}
        optinfo:=nil;
{$endif}
      end;


    procedure tai.ppuwrite(ppufile:tcompilerppufile);
      begin
      end;


    procedure tai.derefimpl;
      begin
      end;


    procedure tai.checkredefinesym(sym:tasmsymbol);
      begin
{        if assigned(sym.taiowner) then
         begin
           Message1(asmw_e_redefined_label,sym.name);
         end
        else
         sym.taiowner:=self;}
      end;


{****************************************************************************
                              TAILINEINFO
 ****************************************************************************}

    constructor tailineinfo.create;
     begin
       inherited create;
       fileinfo:=aktfilepos;
     end;


    constructor tailineinfo.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        ppufile.getposinfo(fileinfo);
      end;


    procedure tailineinfo.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putposinfo(fileinfo);
      end;


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

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


    constructor tai_section.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        sec:=tsection(ppufile.getbyte);
      end;


    procedure tai_section.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putbyte(byte(sec));
      end;


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

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

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


    constructor tai_datablock.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited Create;
        sym:=ppufile.getasmsymbol;
        size:=ppufile.getlongint;
        is_global:=boolean(ppufile.getbyte);
      end;


    procedure tai_datablock.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putasmsymbol(sym);
        ppufile.putlongint(size);
        ppufile.putbyte(byte(is_global));
      end;


    procedure tai_datablock.derefimpl;
      begin
        objectlibrary.DerefAsmsymbol(sym);
      end;


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

    constructor tai_symbol.Create(_sym:tasmsymbol;siz:longint);
      begin
         inherited Create;
         typ:=ait_symbol;
         sym:=_sym;
{         checkredefinesym(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:=objectlibrary.newasmsymboltype(_name,AB_LOCAL,AT_FUNCTION);
{         checkredefinesym(sym);}
         size:=siz;
         is_global:=false;
      end;

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

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

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


    constructor tai_symbol.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        sym:=ppufile.getasmsymbol;
        size:=ppufile.getlongint;
        is_global:=boolean(ppufile.getbyte);
      end;


    procedure tai_symbol.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putasmsymbol(sym);
        ppufile.putlongint(size);
        ppufile.putbyte(byte(is_global));
      end;


    procedure tai_symbol.derefimpl;
      begin
        objectlibrary.DerefAsmsymbol(sym);
      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:=objectlibrary.newasmsymboltype(_name,AB_GLOBAL,AT_NONE);
      end;

    constructor tai_symbol_end.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        sym:=ppufile.getasmsymbol;
      end;


    procedure tai_symbol_end.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putasmsymbol(sym);
      end;


    procedure tai_symbol_end.derefimpl;
      begin
        objectlibrary.DerefAsmsymbol(sym);
      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;


    constructor tai_const.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        value:=ppufile.getlongint;
      end;


    procedure tai_const.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putlongint(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 }
         sym.increfs;
      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 }
         sym.increfs;
      end;

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

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

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

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


    constructor tai_const_symbol.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        sym:=ppufile.getasmsymbol;
        offset:=ppufile.getlongint;
      end;


    procedure tai_const_symbol.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putasmsymbol(sym);
        ppufile.putlongint(offset);
      end;


    procedure tai_const_symbol.derefimpl;
      begin
        objectlibrary.DerefAsmsymbol(sym);
      end;


    function tai_const_symbol.getcopy:tlinkedlistitem;
      begin
        getcopy:=inherited getcopy;
        { we need to increase the reference number }
        sym.increfs;
      end;


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

    constructor tai_real_32bit.Create(_value : ts32real);

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

    constructor tai_real_32bit.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        value:=ppufile.getreal;
      end;


    procedure tai_real_32bit.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putreal(value);
      end;


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

    constructor tai_real_64bit.Create(_value : ts64real);

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


    constructor tai_real_64bit.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        value:=ppufile.getreal;
      end;


    procedure tai_real_64bit.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putreal(value);
      end;


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

    constructor tai_real_80bit.Create(_value : ts80real);

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


    constructor tai_real_80bit.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        value:=ppufile.getreal;
      end;


    procedure tai_real_80bit.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putreal(value);
      end;


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

    constructor tai_comp_64bit.Create(_value : ts64comp);

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


    constructor tai_comp_64bit.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        value:=ppufile.getreal;
      end;


    procedure tai_comp_64bit.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putreal(value);
      end;


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

     constructor tai_string.Create(const _str : string);

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


    constructor tai_string.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        len:=ppufile.getlongint;
        getmem(str,len+1);
        ppufile.getdata(str^,len);
        str[len]:=#0;
      end;


    procedure tai_string.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putlongint(len);
        ppufile.putdata(str^,len);
      end;


    function tai_string.getcopy : tlinkedlistitem;
      var
        p : tlinkedlistitem;
      begin
        p:=inherited getcopy;
        getmem(tai_string(p).str,len+1);
        move(str^,tai_string(p).str^,len+1);
        getcopy:=p;
      end;


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

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


    constructor tai_label.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        l:=tasmlabel(ppufile.getasmsymbol);
        is_global:=boolean(ppufile.getbyte);
      end;


    procedure tai_label.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putasmsymbol(l);
        ppufile.putbyte(byte(is_global));
      end;


    procedure tai_label.derefimpl;
      begin
        objectlibrary.DerefAsmsymbol(tasmsymbol(l));
        l.is_set:=true;
      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;

    constructor tai_direct.ppuload(t:taitype;ppufile:tcompilerppufile);
      var
        len : longint;
      begin
        inherited ppuload(t,ppufile);
        len:=ppufile.getlongint;
        getmem(str,len+1);
        ppufile.getdata(str^,len);
        str[len]:=#0;
      end;


    procedure tai_direct.ppuwrite(ppufile:tcompilerppufile);
      var
        len : longint;
      begin
        inherited ppuwrite(ppufile);
        len:=strlen(str);
        ppufile.putlongint(len);
        ppufile.putdata(str^,len);
      end;


    function tai_direct.getcopy : tlinkedlistitem;
      var
        p : tlinkedlistitem;
      begin
        p:=inherited getcopy;
        getmem(tai_direct(p).str,strlen(str)+1);
        move(str^,tai_direct(p).str^,strlen(str)+1);
        getcopy:=p;
      end;


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

     constructor tai_comment.Create(_str : pchar);

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

    destructor tai_comment.destroy;

      begin
         strdispose(str);
         inherited Destroy;
      end;

    constructor tai_comment.ppuload(t:taitype;ppufile:tcompilerppufile);
      var
        len : longint;
      begin
        inherited ppuload(t,ppufile);
        len:=ppufile.getlongint;
        getmem(str,len+1);
        ppufile.getdata(str^,len);
        str[len]:=#0;
      end;


    procedure tai_comment.ppuwrite(ppufile:tcompilerppufile);
      var
        len : longint;
      begin
        inherited ppuwrite(ppufile);
        len:=strlen(str);
        ppufile.putlongint(len);
        ppufile.putdata(str^,len);
      end;


    function tai_comment.getcopy : tlinkedlistitem;
      var
        p : tlinkedlistitem;
      begin
        p:=inherited getcopy;
        getmem(tai_comment(p).str,strlen(str)+1);
        move(str^,tai_comment(p).str^,strlen(str)+1);
        getcopy:=p;
      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;


    constructor tai_cut.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        place:=TCutPlace(ppufile.getbyte);
      end;


    procedure tai_cut.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putbyte(byte(place));
      end;


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

    constructor Tai_Marker.Create(_Kind: TMarker);
      begin
        Inherited Create;
        typ := ait_marker;
        Kind := _Kind;
      end;


    constructor Tai_Marker.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        kind:=TMarker(ppufile.getbyte);
      end;


    procedure Tai_Marker.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putbyte(byte(kind));
      end;


{*****************************************************************************
                                tai_tempalloc
*****************************************************************************}

    constructor tai_tempalloc.alloc(pos,size:longint);
      begin
        inherited Create;
        typ:=ait_tempalloc;
        allocation:=true;
        temppos:=pos;
        tempsize:=size;
{$ifdef EXTDEBUG}
        problem:=nil;
{$endif EXTDEBUG}
      end;


    constructor tai_tempalloc.dealloc(pos,size:longint);
      begin
        inherited Create;
        typ:=ait_tempalloc;
        allocation:=false;
        temppos:=pos;
        tempsize:=size;
{$ifdef EXTDEBUG}
        problem:=nil;
{$endif EXTDEBUG}
      end;


{$ifdef EXTDEBUG}
    constructor tai_tempalloc.allocinfo(pos,size:longint;const st:string);
      begin
        inherited Create;
        typ:=ait_tempalloc;
        allocation:=false;
        temppos:=pos;
        tempsize:=size;
        problem:=stringdup(st);
      end;
{$endif EXTDEBUG}


    constructor tai_tempalloc.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        temppos:=ppufile.getlongint;
        tempsize:=ppufile.getlongint;
        allocation:=boolean(ppufile.getbyte);
{$ifdef EXTDEBUG}
        problem:=nil;
{$endif EXTDEBUG}
      end;


    procedure tai_tempalloc.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putlongint(temppos);
        ppufile.putlongint(tempsize);
        ppufile.putbyte(byte(allocation));
      end;


{*****************************************************************************
                                 tai_regalloc
*****************************************************************************}

    constructor tai_regalloc.alloc(r : tregister);
      begin
        inherited create;
        typ:=ait_regalloc;
        allocation:=true;
        reg:=r;
      end;


    constructor tai_regalloc.dealloc(r : tregister);
      begin
        inherited create;
        typ:=ait_regalloc;
        allocation:=false;
        reg:=r;
      end;


    constructor tai_regalloc.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        reg:=tregister(ppufile.getbyte);
        allocation:=boolean(ppufile.getbyte);
      end;


    procedure tai_regalloc.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putbyte(byte(reg));
        ppufile.putbyte(byte(allocation));
      end;


{*****************************************************************************
                               TaiInstruction
*****************************************************************************}

    constructor taicpu_abstract.Create(op : tasmop);

      begin
         inherited create;
         typ:=ait_instruction;
         is_jmp:=false;
         opcode:=op;
         ops:=0;
         fillchar(condition,sizeof(condition),0);
         fillchar(oper,sizeof(oper),0);
      end;


    destructor taicpu_abstract.Destroy;

      var
        i : longint;
      begin
        for i:=0 to ops-1 do
        case oper[i].typ of
          top_ref:
            dispose(oper[i].ref);
        end;
        inherited destroy;
      end;


{ ---------------------------------------------------------------------
    Loading of operands.
  ---------------------------------------------------------------------}

    procedure taicpu_abstract.loadconst(opidx:longint;l:aword);
      begin
        if opidx>=ops then
         ops:=opidx+1;
        with oper[opidx] do
         begin
           if typ=top_ref then
            dispose(ref);
           val:=l;
           typ:=top_const;
         end;
      end;


    procedure taicpu_abstract.loadsymbol(opidx:longint;s:tasmsymbol;sofs:longint);
      begin
        if not assigned(s) then
         internalerror(200204251);
        if opidx>=ops then
         ops:=opidx+1;
        with oper[opidx] do
         begin
           if typ=top_ref then
            dispose(ref);
           sym:=s;
           symofs:=sofs;
           typ:=top_symbol;
         end;
        s.increfs;
      end;


    procedure taicpu_abstract.loadref(opidx:longint;const r:treference);
      begin
        if opidx>=ops then
         ops:=opidx+1;
        with oper[opidx] do
         begin
           if typ<>top_ref then
            new(ref);
           ref^:=r;
{$ifdef i386}
           { We allow this exception for i386, since overloading this would be
             too much of a a speed penalty}
           if not(ref^.segment in [R_DS,R_NO]) then
            segprefix:=ref^.segment;
{$endif}
           typ:=top_ref;
           { mark symbol as used }
           if assigned(ref^.symbol) then
             ref^.symbol.increfs;
         end;
      end;


    procedure taicpu_abstract.loadreg(opidx:longint;r:tregister);
      begin
        if opidx>=ops then
         ops:=opidx+1;
        with oper[opidx] do
         begin
           if typ=top_ref then
            dispose(ref);
           reg:=r;
           typ:=top_reg;
         end;
      end;


    procedure taicpu_abstract.loadoper(opidx:longint;o:toper);
      begin
        if opidx>=ops then
         ops:=opidx+1;
        if oper[opidx].typ=top_ref then
         dispose(oper[opidx].ref);
        oper[opidx]:=o;
        { copy also the reference }
        if oper[opidx].typ=top_ref then
         begin
           new(oper[opidx].ref);
           oper[opidx].ref^:=o.ref^;
         end;
      end;


{ ---------------------------------------------------------------------
    Miscellaneous methods.
  ---------------------------------------------------------------------}

    procedure taicpu_abstract.SetCondition(const c:TAsmCond);
      begin
         condition:=c;
      end;


    Function taicpu_abstract.getcopy:TLinkedListItem;
      var
        i : longint;
        p : TLinkedListItem;
      begin
        p:=inherited getcopy;
        { make a copy of the references }
        for i:=1 to ops do
         if (taicpu_abstract(p).oper[i-1].typ=top_ref) then
          begin
            new(taicpu_abstract(p).oper[i-1].ref);
            taicpu_abstract(p).oper[i-1].ref^:=oper[i-1].ref^;
          end;
        getcopy:=p;
      end;


    constructor taicpu_abstract.ppuload(t:taitype;ppufile:tcompilerppufile);
      var
        i : integer;
      begin
        inherited ppuload(t,ppufile);
        { hopefully, we don't get problems with big/litte endian here when cross compiling :/ }
        ppufile.getdata(condition,sizeof(tasmcond));
        ops:=ppufile.getbyte;
        for i:=1 to ops do
          ppuloadoper(ppufile,oper[i-1]);
        opcode:=tasmop(ppufile.getword);
{$ifdef i386}
        segprefix:=tregister(ppufile.getbyte);
{$endif i386}
        is_jmp:=boolean(ppufile.getbyte);
      end;


    procedure taicpu_abstract.ppuwrite(ppufile:tcompilerppufile);
      var
        i : integer;
      begin
        inherited ppuwrite(ppufile);
        ppufile.putdata(condition,sizeof(tasmcond));
        ppufile.putbyte(ops);
        for i:=1 to ops do
          ppuwriteoper(ppufile,oper[i-1]);
        ppufile.putword(word(opcode));
{$ifdef i386}
        ppufile.putbyte(byte(segprefix));
{$endif i386}
        ppufile.putbyte(byte(is_jmp));
      end;


    procedure taicpu_abstract.derefimpl;
      var
        i : integer;
      begin
        for i:=1 to ops do
          ppuderefoper(oper[i-1]);
      end;


{****************************************************************************
                              tai_align_abstract
 ****************************************************************************}

     constructor tai_align_abstract.Create(b: byte);
       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;


     constructor tai_align_abstract.Create_op(b: byte; _op: byte);
       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;
       end;


     function tai_align_abstract.calculatefillbuf(var buf : tfillbuffer):pchar;
       begin
         fillchar(buf,high(buf),fillop);
         calculatefillbuf:=pchar(@buf);
       end;


    constructor tai_align_abstract.ppuload(t:taitype;ppufile:tcompilerppufile);
      begin
        inherited ppuload(t,ppufile);
        aligntype:=ppufile.getbyte;
        fillsize:=0;
        fillop:=ppufile.getbyte;
        use_op:=boolean(ppufile.getbyte);
      end;


    procedure tai_align_abstract.ppuwrite(ppufile:tcompilerppufile);
      begin
        inherited ppuwrite(ppufile);
        ppufile.putbyte(aligntype);
        ppufile.putbyte(fillop);
        ppufile.putbyte(byte(use_op));
      end;


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

    function taasmoutput.getlasttaifilepos : pfileposinfo;
      var
       hp : tlinkedlistitem;
      begin
         getlasttaifilepos := nil;
         if assigned(last) then
           begin
              { find the last file information record }
              if not (tai(last).typ in SkipLineInfo) then
                 getlasttaifilepos:=@tailineinfo(last).fileinfo
              else 
               { go through list backwards to find the first entry 
                 with line information
               }
               begin
                 hp:=tai(last);
                 while assigned(hp) and (tai(hp).typ in SkipLineInfo) do
                    hp:=hp.Previous;
                 { found entry }
                 if assigned(hp) then
                     getlasttaifilepos:=@tailineinfo(hp).fileinfo
               end;
           end;
      end;

end.
{
  $Log$
  Revision 1.13  2002-11-17 16:31:55  carl
    * memory optimization (3-4%) : cleanup of tai fields,
       cleanup of tdef and tsym fields.
    * make it work for m68k

  Revision 1.12  2002/11/15 16:29:30  peter
    * made tasmsymbol.refs private (merged)

  Revision 1.11  2002/11/15 01:58:45  peter
    * merged changes from 1.0.7 up to 04-11
      - -V option for generating bug report tracing
      - more tracing for option parsing
      - errors for cdecl and high()
      - win32 import stabs
      - win32 records<=8 are returned in eax:edx (turned off by default)
      - heaptrc update
      - more info for temp management in .s file with EXTDEBUG

  Revision 1.10  2002/11/09 15:38:03  carl
    + NOOPT removed the optinfo field

  Revision 1.9  2002/10/05 12:43:23  carl
    * fixes for Delphi 6 compilation
     (warning : Some features do not work under Delphi)

  Revision 1.8  2002/08/19 19:36:42  peter
    * More fixes for cross unit inlining, all tnodes are now implemented
    * Moved pocall_internconst to po_internconst because it is not a
      calling type at all and it conflicted when inlining of these small
      functions was requested

  Revision 1.7  2002/08/18 20:06:23  peter
    * inlining is now also allowed in interface
    * renamed write/load to ppuwrite/ppuload
    * tnode storing in ppu
    * nld,ncon,nbas are already updated for storing in ppu

  Revision 1.6  2002/08/16 05:21:09  florian
    * powerpc compilation fix

  Revision 1.5  2002/08/15 19:10:35  peter
    * first things tai,tnode storing in ppu

  Revision 1.4  2002/08/11 14:32:25  peter
    * renamed current_library to objectlibrary

  Revision 1.3  2002/08/11 13:24:10  peter
    * saving of asmsymbols in ppu supported
    * asmsymbollist global is removed and moved into a new class
      tasmlibrarydata that will hold the info of a .a file which
      corresponds with a single module. Added librarydata to tmodule
      to keep the library info stored for the module. In the future the
      objectfiles will also be stored to the tasmlibrarydata class
    * all getlabel/newasmsymbol and friends are moved to the new class

  Revision 1.2  2002/08/05 18:27:48  carl
    + more more more documentation
    + first version include/exclude (can't test though, not enough scratch for i386 :()...

  Revision 1.1  2002/07/01 18:46:20  peter
    * internal linker
    * reorganized aasm layer

  Revision 1.27  2002/05/18 13:34:04  peter
    * readded missing revisions

  Revision 1.25  2002/05/14 19:34:38  peter
    * removed old logs and updated copyright year

  Revision 1.24  2002/05/14 17:28:08  peter
    * synchronized cpubase between powerpc and i386
    * moved more tables from cpubase to cpuasm
    * tai_align_abstract moved to tainst, cpuasm must define
      the tai_align class now, which may be empty

  Revision 1.23  2002/04/15 18:54:34  carl
  - removed tcpuflags

  Revision 1.22  2002/04/07 13:18:19  carl
  + more documentation

  Revision 1.21  2002/04/07 10:17:40  carl
  - remove packenumfixed (requires version 1.0.2 or later to compile now!)
  + changing some comments so its commented automatically

  Revision 1.20  2002/03/24 19:04:31  carl
  + patch for SPARC from Mazen NEIFER

}