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 secondsetcons(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;
         found : boolean;
      begin
         clear_reference(p^.location.reference);
         lastlabel:=nil;
         found:=false;
         { const already used ? }
         if p^.labnumber=-1 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^.valued)) or
                               ((p^.realtyp=ait_real_extended) and (pai_extended(hp1)^.value=p^.valued)) or
                               ((p^.realtyp=ait_real_32bit) and (pai_single(hp1)^.value=p^.valued)) then
                               begin
                                  { found! }
                                  p^.labnumber:=lastlabel^.nb;
                                  break;
                               end;
                          end;
                        lastlabel:=nil;
                     end;
                   hp1:=pai(hp1^.next);
                end;
              { :-(, we must generate a new entry }
              if p^.labnumber=-1 then
                begin
                   getlabel(lastlabel);
                   p^.labnumber:=lastlabel^.nb;
                   concat_constlabel(lastlabel,constreal);
                   case p^.realtyp of
                     ait_real_64bit : consts^.concat(new(pai_double,init(p^.valued)));
                     ait_real_32bit : consts^.concat(new(pai_single,init(p^.valued)));
                  ait_real_extended : consts^.concat(new(pai_extended,init(p^.valued)));
                   else
                     internalerror(10120);
                   end;
                end;
           end;
         stringdispose(p^.location.reference.symbol);
         if assigned(lastlabel) then
           p^.location.reference.symbol:=stringdup(constlabel2str(lastlabel,constreal))
         else
           p^.location.reference.symbol:=stringdup(constlabelnb2str(p^.labnumber,constreal));
      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^.valuef;
      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 : word;

      begin
         clear_reference(p^.location.reference);
         lastlabel:=nil;
         { const already used ? }
         if p^.labstrnumber=-1 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^.values^)+2) then
{$endif UseAnsiString}

                          begin
                             same_string:=true;
{$ifndef UseAnsiString}
                             { weird error here !!!   }
                             { pchar ' ' was found equal to string '' !!!! }
                             { gave strange output in exceptions !! PM }
                             for i:=0 to length(p^.values^) do
                               if pai_string(hp1)^.str[i]<>p^.values^[i] then
{$else}
                             for i:=0 to p^.length do
                               if pai_string(hp1)^.str[i]<>p^.values[i] then
{$endif}
                                 begin
                                    same_string:=false;
                                    break;
                                 end;
                             if same_string then
                               begin
                                  { found! }
                                  p^.labstrnumber:=lastlabel^.nb;
                                  break;
                               end;
                          end;
                        lastlabel:=nil;
                     end;
                   hp1:=pai(hp1^.next);
                end;
              { :-(, we must generate a new entry }
              if p^.labstrnumber=-1 then
                begin
                   getlabel(lastlabel);
                   p^.labstrnumber:=lastlabel^.nb;
{$ifndef UseAnsiString}
                   getmem(pc,length(p^.values^)+3);
                   move(p^.values^,pc^,length(p^.values^)+1);
                   pc[length(p^.values^)+1]:=#0;
                   concat_constlabel(lastlabel,conststring);
                   { 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^.values^)+2)));
{$else UseAnsiString}

                   { generate an ansi string ? }
                   case p^.stringtype of
                      st_ansistring:
                        begin
                           { an empty ansi string is nil! }
                           concat_constlabel(lastlabel,conststring);
                           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^.values^,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^.values^,pc[1],p^.length+1);
                           pc[0]:=chr(p^.length);
                           concat_constlabel(lastlabel,conststring);
                           { 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;
         stringdispose(p^.location.reference.symbol);
         if assigned(lastlabel) then
           p^.location.reference.symbol:=stringdup(constlabel2str(lastlabel,conststring))
         else
           p^.location.reference.symbol:=stringdup(constlabelnb2str(p^.labstrnumber,conststring));
         p^.location.loc := LOC_MEM;
      end;


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

    procedure secondsetcons(var p : ptree);
      var
         l    : plabel;
         i    : longint;
         href : treference;
      begin
{$ifdef SMALLSETORD}
        if psetdef(p^.resulttype)^.settype=smallset then
         begin
           p^.location.loc:=LOC_MEM;
           p^.location.reference.isintvalue:=true;
           p^.location.reference.offset:=p^.constset^[0];
         end
        else
         begin
           reset_reference(href);
           getlabel(l);
           stringdispose(p^.location.reference.symbol);
           href.symbol:=stringdup(constlabel2str(l,constseta));
           concat_constlabel(l,constseta);
           for i:=0 to 31 do
             consts^.concat(new(pai_const,init_8bit(p^.constset^[i])));
           p^.location.reference:=href;
         end;
{$else}
        reset_reference(href);
        getlabel(l);
        stringdispose(p^.location.reference.symbol);
        href.symbol:=stringdup(constlabel2str(l,constseta));
        concat_constlabel(l,constseta);
        if psetdef(p^.resulttype)^.settype=smallset then
         begin
           move(p^.constset^,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^.constset^[i])));
         end;
        p^.location.reference:=href;
{$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 1.1  1998-09-01 09:07:09  peter
    * m68k fixes, splitted cg68k like cgi386

}