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

    Generates the argument location information for x86-64 target

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published bymethodpointer
    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.

 ****************************************************************************
}
{ Generates the argument location information for x86-64 target.
}
unit cpupara;

{$i fpcdefs.inc}

  interface

    uses
       cpubase,
       symconst,symbase,symtype,symdef,paramgr;

    type
       { Returns the location for the nr-st 32 Bit int parameter
         if every parameter before is an 32 Bit int parameter as well
         and if the calling conventions for the helper routines of the
         rtl are used.
       }
       tx86_64paramanager = class(tparamanager)
          function getintparaloc(nr : longint) : tparalocation;override;
          procedure create_param_loc_info(p : tabstractprocdef);override;
       end;

  implementation

    uses
       verbose,
       globtype,
       cpuinfo,cginfo,cgbase,
       defutil;

    function getparaloc(p : tdef) : tcgloc;

      begin
         { Later, the LOC_REFERENCE is in most cases changed into LOC_REGISTER
           if push_addr_param for the def is true
         }
         // !!!!! Fix aggregate types
         case p.deftype of
            orddef:
              getparaloc:=LOC_REGISTER;
            floatdef:
              case tfloatdef(p).typ of
                 s80real:
                   getparaloc:=LOC_REFERENCE;
                 s32real,
                 s64real,
                 s64comp,
                 s64currency,
                 s128real:
                   getparaloc:=LOC_MMREGISTER;
              end;
            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;

    function tx86_64paramanager.getintparaloc(nr : longint) : tparalocation;
      const
         nr2reg : array[1..6] of word = (NR_RDI,NR_RSI,NR_RDX,NR_RCX,NR_R8,NR_R9);
      begin
         fillchar(result,sizeof(tparalocation),0);
         if nr<1 then
           internalerror(200304303)
         else if nr<=6 then
           begin
              result.loc:=LOC_REGISTER;
              result.register.enum:=R_INTREGISTER;
              result.register.number:=nr2reg[nr];
           end
         else
           begin
              result.loc:=LOC_REFERENCE;
              result.reference.index.enum:=R_INTREGISTER;
              result.reference.index.number:=NR_STACK_POINTER_REG;
              result.reference.offset:=(nr-6)*8;
           end;
      end;

    procedure tx86_64paramanager.create_param_loc_info(p : tabstractprocdef);
      begin
         { set default para_alignment to target_info.stackalignment }
         { if para_alignment=0 then
           para_alignment:=aktalignment.paraalign;
         }
      end;


begin
   paramanager:=tx86_64paramanager.create;
end.
{
  $Log$
  Revision 1.4  2003-04-30 20:53:32  florian
    * error when address of an abstract method is taken
    * fixed some x86-64 problems
    * merged some more x86-64 and i386 code

  Revision 1.3  2002/04/25 16:12:09  florian
    * fixed more problems with cpubase and x86-64

  Revision 1.2  2003/01/05 13:36:54  florian
    * x86-64 compiles
    + very basic support for float128 type (x86-64 only)

  Revision 1.1  2002/07/24 22:38:15  florian
    + initial release of x86-64 target code
}