{******************************************************************************
    $Id$
    Copyright (c) 2002 by Florian Klaempfl

    PowerPC specific calling conventions

    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 cpupara;
{SPARC specific calling conventions are handled by this unit}
{$INCLUDE fpcdefs.inc}
interface
uses
  cpubase,
  symconst,symbase,symtype,symdef,paramgr;
type
  TSparcParaManager=class(TParaManager)
    function GetIntParaLoc(nr:longint):TParaLocation;override;
    procedure create_param_loc_info(p:TAbstractProcDef);override;
    function GetFuncRetParaLoc(p:TAbstractProcDef):TParaLocation;override;
  end;
implementation
uses
  verbose,
  globtype,
  cpuinfo,cginfo,cgbase,
  defbase;
function TSparcParaManager.GetIntParaLoc(nr:longint):TParaLocation;
  begin
    if nr<1
    then
      InternalError(2002100806);
    FillChar(GetIntParaLoc,SizeOf(TParaLocation),0);
    Dec(nr);
    with GetIntParaLoc do
      if nr<6
      then{The six first parameters are passed into registers}
        begin
          loc:=LOC_REGISTER;
          register:=TRegister(LongInt(R_i0)+nr);
        end
      else{The other parameters are passed into the frame}
        begin
          loc:=LOC_REFERENCE;
          reference.index:=frame_pointer_reg;
          reference.offset:=-68-nr*4;
        end;
  end;
function GetParaLoc(p:TDef):TLoc;
  begin
{Later, the LOC_REFERENCE is in most cases changed into LOC_REGISTER if
push_addr_param for the def is true}
    case p.DefType of
      OrdDef:
        GetParaLoc:=LOC_REGISTER;
      FloatDef:
        GetParaLoc:=LOC_FPUREGISTER;
      enumdef:
        getparaloc:=LOC_REGISTER;
      pointerdef:
        getparaloc:=LOC_REGISTER;
      formaldef:
        getparaloc:=LOC_REGISTER;
      classrefdef:
        getparaloc:=LOC_REGISTER;
      recorddef:
        getparaloc:=LOC_REFERENCE;
      objectdef:
        if is_object(p)
        then
          getparaloc:=LOC_REFERENCE
        else
          getparaloc:=LOC_REGISTER;
      stringdef:
        if is_shortstring(p) or is_longstring(p)
        then
          getparaloc:=LOC_REFERENCE
        else
          getparaloc:=LOC_REGISTER;
      procvardef:
        if (po_methodpointer in tprocvardef(p).procoptions)
        then
          getparaloc:=LOC_REFERENCE
        else
          getparaloc:=LOC_REGISTER;
      filedef:
        getparaloc:=LOC_REGISTER;
      arraydef:
        getparaloc:=LOC_REFERENCE;
      setdef:
        if is_smallset(p)
        then
          getparaloc:=LOC_REGISTER
        else
          getparaloc:=LOC_REFERENCE;
      variantdef:
        getparaloc:=LOC_REFERENCE;
      { avoid problems with errornous definitions }
      errordef:
        getparaloc:=LOC_REGISTER;
      else
        internalerror(2002071001);
    end;
  end;
procedure TSparcParaManager.create_param_loc_info(p:tabstractprocdef);
  var
    nextintreg,nextfloatreg:tregister;
    stack_offset : aword;
    hp : tparaitem;
    loc : tloc;
    is_64bit: boolean;
  begin
    nextintreg:=R_i0;
    nextfloatreg:=R_F0;
    stack_offset:=92;
WriteLn('***********************************************');
    hp:=TParaItem(p.para.First);
    while assigned(hp) do
      begin
        loc:=GetParaLoc(hp.paratype.def);
        case loc of
          LOC_REGISTER:
            begin
              hp.paraloc.size:=def_cgSize(hp.paratype.def);
              if hp.paraloc.size=OS_NO
              then
                hp.paraloc.size:=OS_ADDR;
              is_64bit:=hp.paraloc.size in [OS_64,OS_S64];
              if NextIntReg<=TRegister(ord(R_i5)-ord(is_64bit))
              then
                begin
                  WriteLn('Allocating ',std_reg2str[NextIntReg]);
                  hp.paraloc.loc:=LOC_REGISTER;
                  hp.paraloc.registerlow:=NextIntReg;
                  inc(NextIntReg);
                  if is_64bit
                  then
                    begin
                      hp.paraloc.registerhigh:=nextintreg;
                      inc(nextintreg);
                    end;
                end
              else
                begin
                  nextintreg:=R_i6;
                  hp.paraloc.loc:=LOC_REFERENCE;
                  hp.paraloc.reference.index:=stack_pointer_reg;
                  hp.paraloc.reference.offset:=stack_offset;
                  if not is_64bit
                  then
                    inc(stack_offset,4)
                  else
                    inc(stack_offset,8);
                end;
            end;
          LOC_FPUREGISTER:
            begin
                      if hp.paratyp in [vs_var,vs_out] then
                        begin
                            if nextintreg<=R_O5 then
                             begin
                                hp.paraloc.size:=OS_ADDR;
                                hp.paraloc.loc:=LOC_REGISTER;
                                hp.paraloc.register:=nextintreg;
                                inc(nextintreg);
                             end
                           else
                              begin
                                 {!!!!!!!}
                                 hp.paraloc.size:=def_cgsize(hp.paratype.def);
                                 internalerror(2002071006);
                             end;
                        end
                      else if nextfloatreg<=R_F10 then
                        begin
                           hp.paraloc.size:=def_cgsize(hp.paratype.def);
                           hp.paraloc.loc:=LOC_FPUREGISTER;
                           hp.paraloc.register:=nextfloatreg;
                           inc(nextfloatreg);
                        end
                      else
                         begin
                            {!!!!!!!}
                             hp.paraloc.size:=def_cgsize(hp.paratype.def);
                            internalerror(2002071004);
                        end;
                   end;
                 LOC_REFERENCE:
                   begin
                      hp.paraloc.size:=OS_ADDR;
                      if push_addr_param(hp.paratype.def,p.proccalloption in [pocall_cdecl,pocall_cppdecl]) or (hp.paratyp in [vs_var,vs_out]) then
                        begin
                           if nextintreg<=R_O5 then
                             begin
                                hp.paraloc.loc:=LOC_REGISTER;
                                hp.paraloc.register:=nextintreg;
                                inc(nextintreg);
                             end
                           else
                              begin
                                 hp.paraloc.loc:=LOC_REFERENCE;
                                 hp.paraloc.reference.index:=stack_pointer_reg;
                                 hp.paraloc.reference.offset:=stack_offset;
                                 inc(stack_offset,4);
                             end;
                        end
                      else
                        begin
                           hp.paraloc.loc:=LOC_REFERENCE;
                           hp.paraloc.reference.index:=stack_pointer_reg;
                           hp.paraloc.reference.offset:=stack_offset;
                           inc(stack_offset,hp.paratype.def.size);
                        end;
                   end;
                 else
                   internalerror(2002071002);
        end;
      hp:=TParaItem(hp.Next);
    end;
  end;
function tSparcParaManager.GetFuncRetParaLoc(p:TAbstractProcDef):TParaLocation;
  begin
    case p.rettype.def.deftype of
      orddef,enumdef:
        begin
          WriteLn('Allocating i0 as return register');
          GetFuncRetParaLoc.loc:=LOC_REGISTER;
          GetFuncRetParaLoc.register:=R_I0;
          GetFuncRetParaLoc.size:=def_cgsize(p.rettype.def);
          if GetFuncRetParaLoc.size in [OS_S64,OS_64]
          then
            GetFuncRetParaLoc.RegisterHigh:=R_I1;
        end;
      floatdef:
        begin
          GetFuncRetParaLoc.loc:=LOC_FPUREGISTER;
          GetFuncRetParaLoc.register:=R_F1;
          GetFuncRetParaLoc.size:=def_cgsize(p.rettype.def);
        end;
      setdef,
      variantdef,
      pointerdef,
      formaldef,
      classrefdef,
      recorddef,
      objectdef,
      stringdef,
      procvardef,
      filedef,
      arraydef,
      errordef:
        begin
          GetFuncRetParaLoc.loc:=LOC_REGISTER;
          GetFuncRetParaLoc.register:=R_I0;
          GetFuncRetParaLoc.size:=OS_ADDR;
        end;
      else
        internalerror(2002090903);
    end;
  end;
begin
   ParaManager:=TSparcParaManager.create;
end.
{
  $Log$
  Revision 1.7  2002-10-10 19:57:51  mazen
  * Just to update repsitory

  Revision 1.6  2002/10/10 15:10:39  mazen
  * Internal error fixed, but usually i386 parameter model used

  Revision 1.5  2002/10/09 13:52:19  mazen
  just incase some one wolud help me debugging that\!
  
  Revision 1.4  2002/10/08 21:02:22  mazen
  * debugging register allocation
  
  Revision 1.3  2002/10/07 20:33:05  mazen
  word alignement modified in g_stack_frame

  Revision 1.2  2002/10/04 21:57:42  mazen
  * register allocation for parameters now done in cpupara, but InternalError(200109223) in cgcpu.pas:1053 is still not fixed du to location_force problem in ncgutils.pas:419

  Revision 1.1  2002/08/21 13:30:07  mazen
  *** empty log message ***

  Revision 1.2  2002/07/11 14:41:34  florian
    * start of the new generic parameter handling

  Revision 1.1  2002/07/07 09:44:32  florian
    * powerpc target fixed, very simple units can be compiled
}