{
    Copyright (c) 2003 by Florian Klaempfl

    This unit implements an asm for the Z80

    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.

 ****************************************************************************
}
{ This unit implements the assembler writer for the z80asm assembler:
  http://savannah.nongnu.org/projects/z80asm
}

unit agz80asm;

{$i fpcdefs.inc}

  interface

    uses
       globtype,systems,
       aasmtai,aasmdata,
       assemble,
       cpubase;

    type
      TZ80AsmAssembler=class(TExternalAssembler)
        procedure WriteTree(p : TAsmList); override;
        procedure WriteAsmList;override;
        function MakeCmdLine: TCmdStr; override;
      end;

  implementation

    uses
       cutils,globals,verbose,
       aasmbase,aasmcpu,
       cpuinfo,
       cgbase,cgutils;

    const
      line_length = 70;

        procedure TZ80AsmAssembler.WriteTree(p: TAsmList);

      function getreferencestring(var ref : treference) : string;
        var
          s : string;
        begin
           s:='';
           with ref do
            begin
  {$ifdef extdebug}
              // if base=NR_NO then
              //   internalerror(200308292);

              // if ((index<>NR_NO) or (shiftmode<>SM_None)) and ((offset<>0) or (symbol<>nil)) then
              //   internalerror(200308293);
  {$endif extdebug}
              if index<>NR_NO then
                internalerror(2011021701)
              else if base<>NR_NO then
                begin
//                  if addressmode=AM_PREDRECEMENT then
//                    s:='-';

                  //case base of
                  //  NR_R26:
                  //    s:=s+'X';
                  //  NR_R28:
                  //    s:=s+'Y';
                  //  NR_R30:
                  //    s:=s+'Z';
                  //  else
                  //    s:=gas_regname(base);
                  //end;
                  //if addressmode=AM_POSTINCREMENT then
                  //  s:=s+'+';
                  //
                  //if offset>0 then
                  //  s:=s+'+'+tostr(offset)
                  //else if offset<0 then
                  //  s:=s+tostr(offset)
                end
              else if assigned(symbol) or (offset<>0) then
                begin
                  //if assigned(symbol) then
                  //  s:=ReplaceForbiddenAsmSymbolChars(symbol.name);
                  //
                  //if offset<0 then
                  //  s:=s+tostr(offset)
                  //else if offset>0 then
                  //  s:=s+'+'+tostr(offset);
                  //case refaddr of
                  //  addr_hi8:
                  //    s:='hi8('+s+')';
                  //  addr_hi8_gs:
                  //    s:='hi8(gs('+s+'))';
                  //  addr_lo8:
                  //    s:='lo8('+s+')';
                  //  addr_lo8_gs:
                  //    s:='lo8(gs('+s+'))';
                  //  else
                  //    s:='('+s+')';
                  //end;
                end;
            end;
          getreferencestring:=s;
        end;


      function getopstr(const o:toper) : string;
        var
          hs : string;
          first : boolean;
          r : tsuperregister;
        begin
          //case o.typ of
          //  top_reg:
          //    getopstr:=gas_regname(o.reg);
          //  top_const:
          //    getopstr:=tostr(longint(o.val));
          //  top_ref:
          //    if o.ref^.refaddr=addr_full then
          //      begin
          //        hs:=ReplaceForbiddenAsmSymbolChars(o.ref^.symbol.name);
          //        if o.ref^.offset>0 then
          //         hs:=hs+'+'+tostr(o.ref^.offset)
          //        else
          //         if o.ref^.offset<0 then
          //          hs:=hs+tostr(o.ref^.offset);
          //        getopstr:=hs;
          //      end
          //    else
          //      getopstr:=getreferencestring(o.ref^);
          //  else
          //    internalerror(2002070604);
          //end;
        end;

    //var op: TAsmOp;
    //    s: string;
    //    i: byte;
    //    sep: string[3];
    var
      hp: tai;
      s: string;
      counter,lines,i,j: longint;
      quoted: Boolean;
    begin
      if not assigned(p) then
       exit;
      hp:=tai(p.first);
      while assigned(hp) do
        begin
          prefetch(pointer(hp.next)^);
          case hp.typ of
            ait_comment :
              begin
                writer.AsmWrite(asminfo^.comment);
                writer.AsmWritePChar(tai_comment(hp).str);
                writer.AsmLn;
              end;
            ait_label :
              begin
                if tai_label(hp).labsym.is_used then
                 begin
                   writer.AsmWrite(tai_label(hp).labsym.name);
                   writer.AsmWriteLn(':');
                 end;
              end;
            ait_string :
              begin
                counter := 0;
                lines := tai_string(hp).len div line_length;
                { separate lines in different parts }
                if tai_string(hp).len > 0 then
                 Begin
                   for j := 0 to lines-1 do
                    begin
                      writer.AsmWrite(#9#9'DB'#9);
                      quoted:=false;
                      for i:=counter to counter+line_length-1 do
                         begin
                           { it is an ascii character. }
                           if (ord(tai_string(hp).str[i])>31) and
                              (ord(tai_string(hp).str[i])<127) and
                              (tai_string(hp).str[i]<>'"') then
                               begin
                                 if not(quoted) then
                                     begin
                                       if i>counter then
                                         writer.AsmWrite(',');
                                       writer.AsmWrite('"');
                                     end;
                                 writer.AsmWrite(tai_string(hp).str[i]);
                                 quoted:=true;
                               end { if > 31 and < 127 and ord('"') }
                           else
                               begin
                                   if quoted then
                                       writer.AsmWrite('"');
                                   if i>counter then
                                       writer.AsmWrite(',');
                                   quoted:=false;
                                   writer.AsmWrite(tostr(ord(tai_string(hp).str[i])));
                               end;
                        end; { end for i:=0 to... }
                      if quoted then writer.AsmWrite('"');
                        writer.AsmWrite(target_info.newline);
                      counter := counter+line_length;
                   end; { end for j:=0 ... }
                 { do last line of lines }
                 if counter<tai_string(hp).len then
                   writer.AsmWrite(#9#9'DB'#9);
                 quoted:=false;
                 for i:=counter to tai_string(hp).len-1 do
                   begin
                     { it is an ascii character. }
                     if (ord(tai_string(hp).str[i])>31) and
                        (ord(tai_string(hp).str[i])<128) and
                        (tai_string(hp).str[i]<>'"') then
                         begin
                           if not(quoted) then
                               begin
                                 if i>counter then
                                   writer.AsmWrite(',');
                                 writer.AsmWrite('"');
                               end;
                           writer.AsmWrite(tai_string(hp).str[i]);
                           quoted:=true;
                         end { if > 31 and < 128 and " }
                     else
                         begin
                           if quoted then
                             writer.AsmWrite('"');
                           if i>counter then
                               writer.AsmWrite(',');
                           quoted:=false;
                           writer.AsmWrite(tostr(ord(tai_string(hp).str[i])));
                         end;
                   end; { end for i:=0 to... }
                 if quoted then
                   writer.AsmWrite('"');
                 end;
                writer.AsmLn;
              end;
            else
              begin
                writer.AsmWrite(asminfo^.comment);
                writer.AsmWrite('WARNING: not yet implemented in assembler output: ');
                Str(hp.typ,s);
                writer.AsmWriteLn(s);
              end;
          end;
          hp:=tai(hp.next);
        end;
      //op:=taicpu(hp).opcode;
      //s:=#9+gas_op2str[op]+cond2str[taicpu(hp).condition];
      //if taicpu(hp).ops<>0 then
      //  begin
      //    sep:=#9;
      //    for i:=0 to taicpu(hp).ops-1 do
      //      begin
      //        s:=s+sep+getopstr(taicpu(hp).oper[i]^);
      //        sep:=',';
      //      end;
      //  end;
      //owner.writer.AsmWriteLn(s);
    end;


    procedure TZ80AsmAssembler.WriteAsmList;
      var
        hal: TAsmListType;
      begin
        for hal:=low(TasmlistType) to high(TasmlistType) do
          begin
            writer.AsmWriteLn(asminfo^.comment+'Begin asmlist '+AsmListTypeStr[hal]);
            writetree(current_asmdata.asmlists[hal]);
            writer.AsmWriteLn(asminfo^.comment+'End asmlist '+AsmListTypeStr[hal]);
          end;
      end;


    function TZ80AsmAssembler.MakeCmdLine: TCmdStr;
      begin
        result := {'-mmcu='+lower(cputypestr[current_settings.cputype])+' '+}inherited MakeCmdLine;
      end;


    const
       as_Z80_asm_info : tasminfo =
          (
            id     : as_z80asm;

            idtxt  : 'Z80Asm';
            asmbin : 'z80asm';
            asmcmd : '-o $OBJ $EXTRAOPT $ASM';
            supported_targets : [system_Z80_embedded];
            flags : [af_needar,af_smartlink_sections];
            labelprefix : '.L';
            comment : '; ';
            dollarsign: 's';
          );


begin
  RegisterAssembler(as_Z80_asm_info,TZ80AsmAssembler);
end.