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

    This unit contains the CPU specific part of tprocinfo

    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 contains the CPU specific part of tprocinfo. }
unit cpupi;

{$i fpcdefs.inc}

  interface

    uses
       cutils,
       cgbase,cpuinfo;

    type
       tppcprocinfo = class(tprocinfo)
          { overall size of allocated stack space, currently this is used for the PowerPC only }
          localsize : aword;

          { max. of space need for parameters, currently used by the PowerPC port only }
          maxpushedparasize : aword;

          constructor create;override;
          procedure after_header;override;
          procedure after_pass1;override;
       end;


  implementation

    uses
       globtype,globals,
       cpubase,
       aasmtai,
       tgobj,
       symconst, symsym,paramgr;

    constructor tppcprocinfo.create;

      begin
         inherited create;
         maxpushedparasize:=0;
         localsize:=0;
      end;

    procedure tppcprocinfo.after_header;
      begin
         procdef.parast.address_fixup:=0;
         if assigned(procdef.localst) and (procdef.localst.symtablelevel>1) then
           begin
              procinfo.framepointer_offset:=procdef.parast.address_fixup;
              inc(procdef.parast.address_fixup,4);
           end;
         if paramanager.ret_in_param(procdef.rettype.def,procdef.proccalloption) then
           begin
              procinfo.return_offset:=procdef.parast.address_fixup;
              inc(procdef.parast.address_fixup,4);
           end;
         if assigned(_class) then
           begin
              procinfo.selfpointer_offset:=procdef.parast.address_fixup;
              inc(procdef.parast.address_fixup,4);
           end;
         { this value is necessary for nested procedures }
         if assigned(procdef.localst) then
           procdef.localst.address_fixup:=align(procdef.parast.address_fixup+procdef.parast.datasize,16);

{
         procdef.funcretsym isn't set here yet and besides,
         symtable.insertvardata() already sets procinfo.return_offset! (JM)
         if assigned(procdef.funcretsym) and
           not(paramanager.ret_in_param(procdef.rettype.def,procdef.proccalloption)) then
           procinfo.return_offset:=tg.direction*tfuncretsym(procdef.funcretsym).address+procdef.localst.address_fixup;
}
     end;

    procedure tppcprocinfo.after_pass1;
      var
         ofs : aword;
      begin
         if not(po_assembler in procdef.procoptions) then
           begin
             ofs:=align(maxpushedparasize+LinkageAreaSize,16);
             inc(procdef.parast.address_fixup,ofs);
             inc(procinfo.return_offset,ofs);
             inc(procinfo.framepointer_offset,ofs);
             inc(procinfo.selfpointer_offset,ofs);
             if cs_asm_source in aktglobalswitches then
               aktproccode.insert(Tai_comment.Create(strpnew('Parameter copies start at: r1+'+tostr(procdef.parast.address_fixup))));

//             Already done with an "inc" above now, not sure if it's correct (JM)
             procdef.localst.address_fixup:=procdef.parast.address_fixup+procdef.parast.datasize;

{ 
             Already done with an "inc" above, should be correct (JM)
             if assigned(procdef.funcretsym) and
               not(paramanager.ret_in_param(procdef.rettype.def,procdef.proccalloption)) then
               procinfo.return_offset:=tg.direction*tfuncretsym(procdef.funcretsym).address+procdef.localst.address_fixup;
}

             if cs_asm_source in aktglobalswitches then
               aktproccode.insert(Tai_comment.Create(strpnew('Locals start at: r1+'+tostr(procdef.localst.address_fixup))));

             procinfo.firsttemp_offset:=align(procdef.localst.address_fixup+procdef.localst.datasize,16);
             if cs_asm_source in aktglobalswitches then
               aktproccode.insert(Tai_comment.Create(strpnew('Temp. space start: r1+'+tostr(procinfo.firsttemp_offset))));

             //!!!! tg.setfirsttemp(procinfo.firsttemp_offset);
             tg.firsttemp:=procinfo.firsttemp_offset;
             tg.lasttemp:=procinfo.firsttemp_offset;
           end;
      end;

begin
   cprocinfo:=tppcprocinfo;
end.
{
  $Log$
  Revision 1.8  2003-04-06 16:39:11  jonas
    * don't generate entry/exit code for assembler procedures

  Revision 1.7  2003/04/05 21:09:32  jonas
    * several ppc/generic result offset related fixes. The "normal" result
      offset seems now to be calculated correctly and a lot of duplicate
      calculations have been removed. Nested functions accessing the parent's
      function result don't work at all though :(

  Revision 1.6  2002/12/15 19:22:01  florian
    * fixed some crashes and a rte 201

  Revision 1.5  2002/11/18 17:32:01  peter
    * pass proccalloption to ret_in_xxx and push_xxx functions

  Revision 1.4  2002/09/10 20:30:42  florian
    * fixed offset calculation for symtables etc.

  Revision 1.3  2002/09/07 17:54:59  florian
    * first part of PowerPC fixes

  Revision 1.2  2002/08/18 20:06:30  peter
    * inlining is now also allowed in interface
    * renamed write/load to ppuwrite/ppuload
    * tnode storing in ppu
    * nld,ncon,nbas are already updated for storing in ppu

  Revision 1.1  2002/08/17 09:23:49  florian
    * first part of procinfo rewrite
}