freepascal.compiler/compiler/ag386int.pas

{
    $Id$
    Copyright (c) 1996,97 by Florian Klaempfl

    This unit implements an asmoutput class for Intel syntax with Intel i386+

    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 ag386int;

    interface

    uses aasm,assemble;

    type
      pi386intasmlist=^ti386intasmlist;
      ti386intasmlist = object(tasmlist)
        procedure WriteTree(p:paasmoutput);virtual;
        procedure WriteAsmList;virtual;
      end;

  implementation

    uses
      dos,globals,systems,cobjects,i386,
      strings,files,verbose
{$ifdef GDB}
      ,gdb
{$endif GDB}
      ;

    const
      line_length = 70;

      extstr : array[EXT_NEAR..EXT_ABS] of String[8] =
             ('NEAR','FAR','PROC','BYTE','WORD','DWORD',
              'CODEPTR','DATAPTR','FWORD','PWORD','QWORD','TBYTE','ABS');


    function double2str(d : double) : string;
      var
         hs : string;
         p : byte;
      begin
         str(d,hs);
      { nasm expects a lowercase e }
         p:=pos('E',hs);
         if p>0 then
          hs[p]:='e';
         p:=pos('+',hs);
         if p>0 then
          delete(hs,p,1);
         double2str:=lower(hs);
      end;


    function comp2str(d : bestreal) : string;
      type
        pdouble = ^double;
      var
        c  : comp;
        dd : pdouble;
      begin
      {$ifdef TP}
         c:=d;
      {$else}
         c:=comp(d);
       {$endif}
         dd:=pdouble(@c); { this makes a bitwise copy of c into a double }
         comp2str:=double2str(dd^);
      end;

    function getreferencestring(const ref : treference) : string;
    var
      s     : string;
      first : boolean;
    begin
      if ref.isintvalue then
       s:= tostr(ref.offset)
      else
      with ref do
        begin
          first:=true;
          if ref.segment<>R_DEFAULT_SEG then
           s:=int_reg2str[segment]+':['
          else
           s:='[';
         if assigned(symbol) then
          begin
            s:=s+symbol^;
            first:=false;
          end;
         if (base<>R_NO) then
          begin
            if not(first) then
             s:=s+'+'
            else
             first:=false;
             s:=s+int_reg2str[base];
          end;
         if (index<>R_NO) then
           begin
             if not(first) then
               s:=s+'+'
             else
               first:=false;
             s:=s+int_reg2str[index];
             if scalefactor<>0 then
               s:=s+'*'+tostr(scalefactor);
           end;
         if offset<0 then
           s:=s+tostr(offset)
         else if (offset>0) then
           s:=s+'+'+tostr(offset);
         s:=s+']';
        end;
       getreferencestring:=s;
     end;

    function getopstr(t : byte;o : pointer;s : topsize; _operator: tasmop;dest : boolean) : string;
    var
      hs : string;
    begin
      case t of
       top_reg : getopstr:=int_reg2str[tregister(o)];
     top_const,
       top_ref : begin
                   if t=top_const then
                     hs := tostr(longint(o))
                   else
                     hs:=getreferencestring(preference(o)^);
                   { can possibly give a range check error under tp }
                   { if using in...                                 }
                   if ((_operator <> A_LGS) and (_operator <> A_LSS) and
                       (_operator <> A_LFS) and (_operator <> A_LDS) and
                       (_operator <> A_LES)) then
                    Begin
                      case s of
                       S_B : hs:='byte ptr '+hs;
                       S_W : hs:='word ptr '+hs;
                       S_L : hs:='dword ptr '+hs;
                      S_IS : hs:='word ptr '+hs;
                      S_IL : hs:='dword ptr '+hs;
                      S_IQ : hs:='qword ptr '+hs;
                      S_FS : hs:='dword ptr '+hs;
                      S_FL : hs:='qword ptr '+hs;
                      S_FX : hs:='tbyte ptr '+hs;
                      S_BW : if dest then
                              hs:='word ptr '+hs
                             else
                              hs:='byte ptr '+hs;
                      S_BL : if dest then
                              hs:='dword ptr '+hs
                             else
                              hs:='byte ptr '+hs;
                      S_WL : if dest then
                              hs:='dword ptr '+hs
                             else
                              hs:='word ptr '+hs;
                      end;
                    end;
                   getopstr:=hs;
                 end;
    top_symbol : begin
                   hs[0]:=chr(strlen(pchar(pcsymbol(o)^.symbol)));
                   move(pchar(pcsymbol(o)^.symbol)^,hs[1],byte(hs[0]));
                   hs:='offset '+hs;
                   if pcsymbol(o)^.offset>0 then
                    hs:=hs+'+'+tostr(pcsymbol(o)^.offset)
                   else
                    if pcsymbol(o)^.offset<0 then
                     hs:=hs+tostr(pcsymbol(o)^.offset);
                   getopstr:=hs;
                 end;
      else
       internalerror(10001);
      end;
    end;

    function getopstr_jmp(t : byte;o : pointer) : string;
    var
      hs : string;
    begin
      case t of
         top_reg : getopstr_jmp:=int_reg2str[tregister(o)];
         top_ref : getopstr_jmp:=getreferencestring(preference(o)^);
       top_const : getopstr_jmp:=tostr(longint(o));
       top_symbol : begin
                      hs[0]:=chr(strlen(pchar(pcsymbol(o)^.symbol)));
                      move(pchar(pcsymbol(o)^.symbol)^,hs[1],byte(hs[0]));
                      if pcsymbol(o)^.offset>0 then
                        hs:=hs+'+'+tostr(pcsymbol(o)^.offset)
                      else
                        if pcsymbol(o)^.offset<0 then
                          hs:=hs+tostr(pcsymbol(o)^.offset);
                      getopstr_jmp:=hs;
                    end;
      else
       internalerror(10001);
      end;
    end;


{****************************************************************************
                               TI386INTASMLIST
 ****************************************************************************}

    var
      LastSec : tsection;

    const
      ait_const2str:array[ait_const_32bit..ait_const_8bit] of string[8]=
        (#9'DD'#9,'',#9'DW'#9,#9'DB'#9);

      ait_section2masmstr : array[tsection] of string[6]=
       ('','CODE','DATA','BSS','');


    Function PadTabs(p:pchar;addch:char):string;
    var
      s : string;
      i : longint;
    begin
      i:=strlen(p);
      if addch<>#0 then
       begin
         inc(i);
         s:=StrPas(p)+addch;
       end
      else
       s:=StrPas(p);
      if i<8 then
       PadTabs:=s+#9#9
      else
       PadTabs:=s+#9;
    end;

    procedure ti386intasmlist.WriteTree(p:paasmoutput);
    type
      twowords=record
        word1,word2:word;
      end;
    var
      s,
      prefix,
      suffix   : string;
      hp       : pai;
      counter,
      lines,
      i,j,l    : longint;
      consttyp : tait;
      found,
      quoted   : boolean;
    begin
      if not assigned(p) then
       exit;
      hp:=pai(p^.first);
      while assigned(hp) do
       begin
         case hp^.typ of
       ait_comment : Begin
                       AsmWrite(target_asm.comment);
                       AsmWritePChar(pai_asm_comment(hp)^.str);
                       AsmLn;
                     End;
       ait_section : begin
                       if LastSec<>sec_none then
                        AsmWriteLn('_'+ait_section2masmstr[LastSec]+#9#9'ENDS');
                       if pai_section(hp)^.sec<>sec_none then
                        begin
                          AsmLn;
                          AsmWriteLn('_'+ait_section2masmstr[pai_section(hp)^.sec]+#9#9+
                                     'SEGMENT'#9'PARA PUBLIC USE32 '''+
                                     ait_section2masmstr[pai_section(hp)^.sec]+'''');
                        end;
                       LastSec:=pai_section(hp)^.sec;
                     end;
         ait_align : begin
                     { CAUSES PROBLEMS WITH THE SEGMENT DEFINITION   }
                     { SEGMENT DEFINITION SHOULD MATCH TYPE OF ALIGN }
                     { HERE UNDER TASM!                              }
                       AsmWriteLn(#9'ALIGN '+tostr(pai_align(hp)^.aligntype));
                     end;
      ait_external : AsmWriteLn(#9'EXTRN'#9+StrPas(pai_external(hp)^.name)+
                                ' :'+extstr[pai_external(hp)^.exttyp]);
     ait_datablock : begin
                       if pai_datablock(hp)^.is_global then
                         AsmWriteLn(#9'PUBLIC'#9+StrPas(pai_datablock(hp)^.name));
                       AsmWriteLn(PadTabs(pai_datablock(hp)^.name,#0)+'DB'#9+tostr(pai_datablock(hp)^.size)+' DUP(?)');
                     end;
   ait_const_32bit,
    ait_const_8bit,
   ait_const_16bit : begin
                       AsmWrite(ait_const2str[hp^.typ]+tostr(pai_const(hp)^.value));
                       consttyp:=hp^.typ;
                       l:=0;
                       repeat
                         found:=(not (Pai(hp^.next)=nil)) and (Pai(hp^.next)^.typ=consttyp);
                         if found then
                          begin
                            hp:=Pai(hp^.next);
                            s:=','+tostr(pai_const(hp)^.value);
                            AsmWrite(s);
                            inc(l,length(s));
                          end;
                       until (not found) or (l>line_length);
                       AsmLn;
                     end;
  ait_const_symbol : begin
                       AsmWrite(#9#9+'DD '#9'offset ');
                       AsmWritePChar(pchar(pai_const(hp)^.value));
                       AsmLn;
                     end;
    ait_real_32bit : AsmWriteLn(#9#9'DD'#9+double2str(pai_single(hp)^.value));
    ait_real_64bit : AsmWriteLn(#9#9'DQ'#9+double2str(pai_double(hp)^.value));
 ait_real_extended : AsmWriteLn(#9#9'DT'#9+double2str(pai_extended(hp)^.value));
          ait_comp : AsmWriteLn(#9#9'DQ'#9+comp2str(pai_extended(hp)^.value));
        ait_string : begin
                       counter := 0;
                       lines := pai_string(hp)^.len div line_length;
                     { separate lines in different parts }
                       if pai_string(hp)^.len > 0 then
                        Begin
                          for j := 0 to lines-1 do
                           begin
                             AsmWrite(#9#9'DB'#9);
                             quoted:=false;
                             for i:=counter to counter+line_length do
                                begin
                                  { it is an ascii character. }
                                  if (ord(pai_string(hp)^.str[i])>31) and
                                     (ord(pai_string(hp)^.str[i])<128) and
                                     (pai_string(hp)^.str[i]<>'"') then
                                      begin
                                        if not(quoted) then
                                            begin
                                              if i>counter then
                                                AsmWrite(',');
                                              AsmWrite('"');
                                            end;
                                        AsmWrite(pai_string(hp)^.str[i]);
                                        quoted:=true;
                                      end { if > 31 and < 128 and ord('"') }
                                  else
                                      begin
                                          if quoted then
                                              AsmWrite('"');
                                          if i>counter then
                                              AsmWrite(',');
                                          quoted:=false;
                                          AsmWrite(tostr(ord(pai_string(hp)^.str[i])));
                                      end;
                               end; { end for i:=0 to... }
                             if quoted then AsmWrite('"');
                               AsmWrite(target_os.newline);
                             counter := counter+line_length;
                          end; { end for j:=0 ... }
                        { do last line of lines }
                        AsmWrite(#9#9'DB'#9);
                        quoted:=false;
                        for i:=counter to pai_string(hp)^.len-1 do
                          begin
                            { it is an ascii character. }
                            if (ord(pai_string(hp)^.str[i])>31) and
                               (ord(pai_string(hp)^.str[i])<128) and
                               (pai_string(hp)^.str[i]<>'"') then
                                begin
                                  if not(quoted) then
                                      begin
                                        if i>counter then
                                          AsmWrite(',');
                                        AsmWrite('"');
                                      end;
                                  AsmWrite(pai_string(hp)^.str[i]);
                                  quoted:=true;
                                end { if > 31 and < 128 and " }
                            else
                                begin
                                  if quoted then
                                    AsmWrite('"');
                                  if i>counter then
                                      AsmWrite(',');
                                  quoted:=false;
                                  AsmWrite(tostr(ord(pai_string(hp)^.str[i])));
                                end;
                          end; { end for i:=0 to... }
                        if quoted then
                          AsmWrite('"');
                        end;
                       AsmLn;
                     end;
         ait_label : begin
                       if pai_label(hp)^.l^.is_used then
                        begin
                          AsmWrite(lab2str(pai_label(hp)^.l));
                          if (assigned(hp^.next) and not(pai(hp^.next)^.typ in
                             [ait_const_32bit,ait_const_16bit,ait_const_8bit,ait_const_symbol,
                              ait_real_32bit,ait_real_64bit,ait_real_extended,ait_string])) then
                           AsmWriteLn(':');
                        end;
                     end;
        ait_direct : begin
                       AsmWritePChar(pai_direct(hp)^.str);
                       AsmLn;
                     end;
ait_labeled_instruction : AsmWriteLn(#9#9+int_op2str[pai_labeled(hp)^._operator]+#9+lab2str(pai_labeled(hp)^.lab));
        ait_symbol : begin
                       if pai_symbol(hp)^.is_global then
                         AsmWriteLn(#9'PUBLIC'#9+StrPas(pai_symbol(hp)^.name));
                       AsmWritePChar(pai_symbol(hp)^.name);
                       if assigned(hp^.next) and not(pai(hp^.next)^.typ in
                          [ait_const_32bit,ait_const_16bit,ait_const_8bit,ait_const_symbol,
                           ait_real_64bit,ait_real_extended,ait_string]) then
                        AsmWriteLn(':')
                     end;
   ait_instruction : begin
                       suffix:='';
                       prefix:= '';
                     { added prefix instructions, must be on same line as opcode }
                       if (pai386(hp)^.op1t = top_none) and
                          ((pai386(hp)^._operator = A_REP) or
                           (pai386(hp)^._operator = A_LOCK) or
                           (pai386(hp)^._operator =  A_REPE) or
                           (pai386(hp)^._operator = A_REPNE)) then
                        Begin
                          prefix:=int_op2str[pai386(hp)^._operator]+#9;
                          hp:=Pai(hp^.next);
                        { this is theorically impossible... }
                          if hp=nil then
                           begin
                             s:=#9#9+prefix;
                             AsmWriteLn(s);
                             break;
                           end;
                        end
                       else
                        prefix:= '';
                       if pai386(hp)^.op1t<>top_none then
                        begin
                          if pai386(hp)^._operator in [A_CALL] then
                           begin
                           { with tasm call near ptr [edi+12] does not
                             work but call near [edi+12] works ?? (PM)

                             It works with call dword ptr [], but you
                             need /m2 (2 passes) with tasm (PFV)
                           }
{                                    if pai386(hp)^.op1t=top_ref then
                              s:='near '+getopstr_jmp(pai386(hp)^.op1t,pai386(hp)^.op1)
                             else
                              s:='near ptr '+getopstr_jmp(pai386(hp)^.op1t,pai386(hp)^.op1);}
                             s:='dword ptr '+getopstr_jmp(pai386(hp)^.op1t,pai386(hp)^.op1);
                           end
                          else
                           begin
                             s:=getopstr(pai386(hp)^.op1t,pai386(hp)^.op1,pai386(hp)^.size,pai386(hp)^._operator,false);
                             if pai386(hp)^.op3t<>top_none then
                              begin
                                if pai386(hp)^.op2t<>top_none then
                                 s:=getopstr(pai386(hp)^.op2t,pointer(longint(twowords(pai386(hp)^.op2).word1)),
                                             pai386(hp)^.size,pai386(hp)^._operator,true)+','+s;
                                s:=getopstr(pai386(hp)^.op3t,pointer(longint(twowords(pai386(hp)^.op2).word2)),
                                            pai386(hp)^.size,pai386(hp)^._operator,false)+','+s;
                              end
                             else
                              if pai386(hp)^.op2t<>top_none then
                               s:=getopstr(pai386(hp)^.op2t,pai386(hp)^.op2,pai386(hp)^.size,
                                           pai386(hp)^._operator,true)+','+s;
                           end;
                          s:=#9+s;
                        end
                       else
                        begin
                          { check if string instruction }
                          { long form, otherwise may give range check errors }
                          { in turbo pascal...                               }
                          if ((pai386(hp)^._operator = A_CMPS) or
                             (pai386(hp)^._operator = A_INS) or
                             (pai386(hp)^._operator = A_OUTS) or
                             (pai386(hp)^._operator = A_SCAS) or
                             (pai386(hp)^._operator = A_STOS) or
                             (pai386(hp)^._operator = A_MOVS) or
                             (pai386(hp)^._operator = A_LODS) or
                             (pai386(hp)^._operator = A_XLAT)) then
                           Begin
                             case pai386(hp)^.size of
                              S_B: suffix:='b';
                              S_W: suffix:='w';
                              S_L: suffix:='d';
                             else
                              Message(assem_f_invalid_suffix_intel);
                             end;
                           end;
                          s:='';
                        end;
                       AsmWriteLn(#9#9+prefix+int_op2str[pai386(hp)^._operator]+suffix+s);
                     end;
{$ifdef GDB}
             ait_stabn,
             ait_stabs,
ait_stab_function_name : ;
{$endif GDB}
         else
          internalerror(10000);
         end;
         hp:=pai(hp^.next);
       end;
    end;


    procedure ti386intasmlist.WriteAsmList;

    begin
{$ifdef EXTDEBUG}
      if assigned(current_module^.mainsource) then
       comment(v_info,'Start writing intel-styled assembler output for '+current_module^.mainsource^);
{$endif}
      LastSec:=sec_none;
      AsmWriteLn(#9'.386p');
      AsmWriteLn(#9'LOCALS '+target_asm.labelprefix);
      AsmWriteLn('DGROUP'#9'GROUP'#9'_BSS,_DATA');
      AsmWriteLn(#9'ASSUME'#9'CS:_CODE,ES:DGROUP,DS:DGROUP,SS:DGROUP');
      AsmLn;

      WriteTree(externals);
    { INTEL ASM doesn't support stabs
      WriteTree(debuglist);}

      WriteTree(codesegment);
      WriteTree(datasegment);
      WriteTree(consts);
      WriteTree(rttilist);
      WriteTree(bsssegment);

      AsmWriteLn(#9'END');
      AsmLn;

{$ifdef EXTDEBUG}
      if assigned(current_module^.mainsource) then
       comment(v_info,'Done writing intel-styled assembler output for '+current_module^.mainsource^);
{$endif EXTDEBUG}
   end;

end.
{
  $Log$
  Revision 1.11  1998-06-05 17:46:02  peter
    * tp doesn't like comp() typecast

  Revision 1.10  1998/05/25 17:11:36  pierre
    * firstpasscount bug fixed
      now all is already set correctly the first time
      under EXTDEBUG try -gp to skip all other firstpasses
      it works !!
    * small bug fixes
      - for smallsets with -dTESTSMALLSET
      - some warnings removed (by correcting code !)

  Revision 1.9  1998/05/23 01:20:55  peter
    + aktasmmode, aktoptprocessor, aktoutputformat
    + smartlink per module $SMARTLINK-/+ (like MMX) and moved to aktswitches
    + $LIBNAME to set the library name where the unit will be put in
    * splitted cgi386 a bit (codeseg to large for bp7)
    * nasm, tasm works again. nasm moved to ag386nsm.pas

  Revision 1.8  1998/05/06 18:36:53  peter
    * tai_section extended with code,data,bss sections and enumerated type
    * ident 'compiled by FPC' moved to pmodules
    * small fix for smartlink

  Revision 1.7  1998/05/06 08:38:32  pierre
    * better position info with UseTokenInfo
      UseTokenInfo greatly simplified
    + added check for changed tree after first time firstpass
      (if we could remove all the cases were it happen
      we could skip all firstpass if firstpasscount > 1)
      Only with ExtDebug

  Revision 1.6  1998/05/04 17:54:24  peter
    + smartlinking works (only case jumptable left todo)
    * redesign of systems.pas to support assemblers and linkers
    + Unitname is now also in the PPU-file, increased version to 14

  Revision 1.5  1998/05/01 07:43:52  florian
    + basics for rtti implemented
    + switch $m (generate rtti for published sections)

  Revision 1.4  1998/04/29 10:33:41  pierre
    + added some code for ansistring (not complete nor working yet)
    * corrected operator overloading
    * corrected nasm output
    + started inline procedures
    + added starstarn : use ** for exponentiation (^ gave problems)
    + started UseTokenInfo cond to get accurate positions

  Revision 1.3  1998/04/08 16:58:01  pierre
    * several bugfixes
      ADD ADC and AND are also sign extended
      nasm output OK (program still crashes at end
      and creates wrong assembler files !!)
      procsym types sym in tdef removed !!

  Revision 1.2  1998/04/08 11:34:17  peter
    * nasm works (linux only tested)
}