freepascal.compiler/compiler/cg68kcon.pas

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

    Generate m68k assembler for constants

    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 cg68kcon;
interface

    uses
      tree;

{.$define SMALLSETORD}


    procedure secondrealconst(var p : ptree);
    procedure secondfixconst(var p : ptree);
    procedure secondordconst(var p : ptree);
    procedure secondstringconst(var p : ptree);
    procedure secondsetconst(var p : ptree);
    procedure secondniln(var p : ptree);


implementation

    uses
      cobjects,verbose,globals,
      symtable,aasm,types,
      hcodegen,temp_gen,pass_2,
      m68k,cga68k,tgen68k;

{*****************************************************************************
                             SecondRealConst
*****************************************************************************}

    procedure secondrealconst(var p : ptree);
      var
         hp1 : pai;
         lastlabel : plabel;
      begin
         lastlabel:=nil;
         { const already used ? }
         if not assigned(p^.lab_real) then
           begin
              { tries to found an old entry }
              hp1:=pai(consts^.first);
              while assigned(hp1) do
                begin
                   if hp1^.typ=ait_label then
                     lastlabel:=pai_label(hp1)^.l
                   else
                     begin
                        if (hp1^.typ=p^.realtyp) and (lastlabel<>nil) then
                          begin
                             if ((p^.realtyp=ait_real_64bit) and (pai_double(hp1)^.value=p^.value_real)) or
                               ((p^.realtyp=ait_real_extended) and (pai_extended(hp1)^.value=p^.value_real)) or
                               ((p^.realtyp=ait_real_32bit) and (pai_single(hp1)^.value=p^.value_real)) then
                               begin
                                  { found! }
                                  p^.lab_real:=lastlabel;
                                  break;
                               end;
                          end;
                        lastlabel:=nil;
                     end;
                   hp1:=pai(hp1^.next);
                end;
              { :-(, we must generate a new entry }
              if not assigned(p^.lab_real) then
                begin
                   getdatalabel(lastlabel);
                   p^.lab_real:=lastlabel;
                   if (cs_smartlink in aktmoduleswitches) then
                    consts^.concat(new(pai_cut,init));
                   consts^.concat(new(pai_label,init(lastlabel)));
                   case p^.realtyp of
                     ait_real_64bit : consts^.concat(new(pai_double,init(p^.value_real)));
                     ait_real_32bit : consts^.concat(new(pai_single,init(p^.value_real)));
                  ait_real_extended : consts^.concat(new(pai_extended,init(p^.value_real)));
                   else
                     internalerror(10120);
                   end;
                end;
           end;
         clear_reference(p^.location.reference);
         p^.location.reference.symbol:=stringdup(lab2str(p^.lab_real));
         p^.location.loc:=LOC_MEM;
      end;


{*****************************************************************************
                             SecondFixConst
*****************************************************************************}

    procedure secondfixconst(var p : ptree);
      begin
         { an fix comma const. behaves as a memory reference }
         p^.location.loc:=LOC_MEM;
         p^.location.reference.isintvalue:=true;
         p^.location.reference.offset:=p^.value_fix;
      end;


{*****************************************************************************
                             SecondOrdConst
*****************************************************************************}

    procedure secondordconst(var p : ptree);
      begin
         { an integer const. behaves as a memory reference }
         p^.location.loc:=LOC_MEM;
         p^.location.reference.isintvalue:=true;
         p^.location.reference.offset:=p^.value;
      end;


{*****************************************************************************
                             SecondStringConst
*****************************************************************************}

    procedure secondstringconst(var p : ptree);
      var
         hp1 : pai;
{$ifdef UseAnsiString}
         l1,
{$endif}
         lastlabel   : plabel;
         pc          : pchar;
         same_string : boolean;
         i           : longint;
      begin
         lastlabel:=nil;
         { const already used ? }
         if not assigned(p^.lab_str) then
           begin
              { tries to found an old entry }
              hp1:=pai(consts^.first);
              while assigned(hp1) do
                begin
                   if hp1^.typ=ait_label then
                     lastlabel:=pai_label(hp1)^.l
                   else
                     begin
                        { when changing that code, be careful that }
                        { you don't use typed consts, which are    }
                        { are also written to consts               }
                        { currently, this is no problem, because   }
                        { typed consts have no leading length or   }
                        { they have no trailing zero               }
{$ifdef UseAnsiString}
                        if (hp1^.typ=ait_string) and (lastlabel<>nil) and
                          (pai_string(hp1)^.len=p^.length+2) then
{$else UseAnsiString}
                        if (hp1^.typ=ait_string) and (lastlabel<>nil) and
                          (pai_string(hp1)^.len=length(p^.value_str^)+2) then
{$endif UseAnsiString}
                          begin
                             same_string:=true;
{$ifndef UseAnsiString}
                             for i:=0 to length(p^.value_str^) do
                               if pai_string(hp1)^.str[i]<>p^.value_str^[i] then
{$else}
                             for i:=0 to p^.length do
                               if pai_string(hp1)^.str[i]<>p^.value_str[i] then
{$endif}
                                 begin
                                    same_string:=false;
                                    break;
                                 end;
                             if same_string then
                               begin
                                  { found! }
                                  p^.lab_str:=lastlabel;
                                  break;
                               end;
                          end;
                        lastlabel:=nil;
                     end;
                   hp1:=pai(hp1^.next);
                end;
              { :-(, we must generate a new entry }
              if not assigned(p^.lab_str) then
                begin
                   getdatalabel(lastlabel);
                   p^.lab_str:=lastlabel;
                   if (cs_smartlink in aktmoduleswitches) then
                    consts^.concat(new(pai_cut,init));
                   consts^.concat(new(pai_label,init(lastlabel)));
{$ifndef UseAnsiString}
                   getmem(pc,length(p^.value_str^)+3);
                   move(p^.value_str^,pc^,length(p^.value_str^)+1);
                   pc[length(p^.value_str^)+1]:=#0;
                   { we still will have a problem if there is a #0 inside the pchar }
                   consts^.concat(new(pai_string,init_length_pchar(pc,length(p^.value_str^)+2)));
{$else UseAnsiString}
                   { generate an ansi string ? }
                   case p^.stringtype of
                      st_ansistring:
                        begin
                           { an empty ansi string is nil! }
                           if p^.length=0 then
                             consts^.concat(new(pai_const,init_32bit(0)))
                           else
                             begin
                                getlabel(l1);
                                consts^.concat(new(pai_const,init_symbol(strpnew(lab2str(l1)))));
                                consts^.concat(new(pai_const,init_32bit(p^.length)));
                                consts^.concat(new(pai_const,init_32bit(p^.length)));
                                consts^.concat(new(pai_const,init_32bit(-1)));
                                consts^.concat(new(pai_label,init(l1)));
                                getmem(pc,p^.length+1);
                                move(p^.value_str^,pc^,p^.length+1);
                                { to overcome this problem we set the length explicitly }
                                { with the ending null char }
                                consts^.concat(new(pai_string,init_length_pchar(pc,p^.length+1)));
                             end;
                        end;
                      st_shortstring:
                        begin
                           getmem(pc,p^.length+3);
                           move(p^.value_str^,pc[1],p^.length+1);
                           pc[0]:=chr(p^.length);
                           { to overcome this problem we set the length explicitly }
                           { with the ending null char }
                           consts^.concat(new(pai_string,init_length_pchar(pc,p^.length+2)));
                        end;
                   end;
{$endif UseAnsiString}
                end;
           end;
         clear_reference(p^.location.reference);
         p^.location.reference.symbol:=stringdup(lab2str(p^.lab_str));
         p^.location.loc:=LOC_MEM;
      end;


{*****************************************************************************
                             SecondSetCons
*****************************************************************************}

    procedure secondsetconst(var p : ptree);
      var
         lastlabel : plabel;
         i : longint;
      begin
{$ifdef SMALLSETORD}
        if psetdef(p^.resulttype)^.settype=smallset then
         begin
           p^.location.loc:=LOC_MEM;
           p^.location.reference.isintvalue:=true;
           p^.location.reference.offset:=p^.value_set^[0];
         end
        else
         begin
           getdatalabel(lastlabel);
           p^.lab_set:=lastlabel;
           if (cs_smartlink in aktmoduleswitches) then
            consts^.concat(new(pai_cut,init));
           consts^.concat(new(pai_label,init(duplabel(lastlabel))));
           for i:=0 to 31 do
             consts^.concat(new(pai_const,init_8bit(p^.value_set^[i])));
           clear_reference(p^.location.reference);
           p^.location.reference.symbol:=stringdup(lab2str(p^.lab_set));
           p^.location.loc:=LOC_MEM;
         end;
{$else}
        getdatalabel(lastlabel);
        p^.lab_set:=lastlabel;
        if (cs_smartlink in aktmoduleswitches) then
         consts^.concat(new(pai_cut,init));
        consts^.concat(new(pai_label,init(lastlabel)));
        if psetdef(p^.resulttype)^.settype=smallset then
         begin
           move(p^.value_set^,i,sizeof(longint));
           consts^.concat(new(pai_const,init_32bit(i)));
         end
        else
         begin
           for i:=0 to 31 do
             consts^.concat(new(pai_const,init_8bit(p^.value_set^[i])));
         end;
        clear_reference(p^.location.reference);
        p^.location.reference.symbol:=stringdup(lab2str(p^.lab_set));
        p^.location.loc:=LOC_MEM;
{$endif SMALLSETORD}
      end;


{*****************************************************************************
                             SecondNilN
*****************************************************************************}

    procedure secondniln(var p : ptree);
      begin
         p^.location.loc:=LOC_MEM;
         p^.location.reference.isintvalue:=true;
         p^.location.reference.offset:=0;
      end;


end.
{
  $Log$
  Revision 1.2  1998-09-07 18:45:56  peter
    * update smartlinking, uses getdatalabel
    * renamed ptree.value vars to value_str,value_real,value_set

}