freepascal.compiler/compiler/i386/ra386dir.pas

{
    $Id$
    Copyright (c) 1998-2000 by Florian Klaempfl

    Reads inline assembler and writes the lines direct to the output

    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 Ra386dir;

{$i defines.inc}

interface

    uses
      node;

     function assemble : tnode;

  implementation

    uses
       { common }
       cutils,
       { global }
       globals,verbose,
       systems,
       { aasm }
       cpubase,aasm,
       { symtable }
       symconst,symtype,symdef,symsym,symtable,types,
       { pass 1 }
       nbas,
       { parser }
       scanner,
       ra386,
       { codegen }
{$ifdef newcg}
       cgbase
{$else}
       hcodegen
{$endif}
       ;

    function assemble : tnode;

      var
         retstr,s,hs : string;
         c : char;
         ende : boolean;
         sym : psym;
         code : TAAsmoutput;
         i,l : longint;

       procedure writeasmline;
         var
           i : longint;
         begin
           i:=length(s);
           while (i>0) and (s[i] in [' ',#9]) do
            dec(i);
           s[0]:=chr(i);
           if s<>'' then
            code.concat(Tai_direct.Create(strpnew(s)));
            { consider it set function set if the offset was loaded }
           if assigned(procinfo^.returntype.def) and
              (pos(retstr,upper(s))>0) then
              procinfo^.funcret_state:=vs_assigned;
           s:='';
         end;

     begin
       ende:=false;
       s:='';
       if assigned(procinfo^.returntype.def) and
          is_fpu(procinfo^.returntype.def) then
         procinfo^.funcret_state:=vs_assigned;
       if assigned(procinfo^.returntype.def) and
          (procinfo^.returntype.def<>pdef(voiddef)) then
         retstr:=upper(tostr(procinfo^.return_offset)+'('+att_reg2str[procinfo^.framepointer]+')')
       else
         retstr:='';
         c:=current_scanner^.asmgetchar;
         code:=TAAsmoutput.Create;
         while not(ende) do
           begin
              { wrong placement
              current_scanner^.gettokenpos; }
              case c of
                 'A'..'Z','a'..'z','_' : begin
                      current_scanner^.gettokenpos;
                      i:=0;
                      hs:='';
                      while ((ord(c)>=ord('A')) and (ord(c)<=ord('Z')))
                         or ((ord(c)>=ord('a')) and (ord(c)<=ord('z')))
                         or ((ord(c)>=ord('0')) and (ord(c)<=ord('9')))
                         or (c='_') do
                        begin
                           inc(i);
                           hs[i]:=c;
                           c:=current_scanner^.asmgetchar;
                        end;
                      hs[0]:=chr(i);
                      if upper(hs)='END' then
                         ende:=true
                      else
                         begin
                            if c=':' then
                              begin
                                getsym(upper(hs),false);
                                if srsym<>nil then
                                  if (srsym^.typ = labelsym) then
                                    Begin
                                       hs:=plabelsym(srsym)^.lab^.name;
                                       plabelsym(srsym)^.lab^.is_set:=true;
                                    end
                                  else
                                    Message(asmr_w_using_defined_as_local);
                              end
                            else if upper(hs)='FWAIT' then
                             FwaitWarning
                            else
                            { access to local variables }
                            if assigned(aktprocsym) then
                              begin
                                 { is the last written character an special }
                                 { char ?                                   }
                                 if (s[length(s)]='%') and
                                    ret_in_acc(procinfo^.returntype.def) and
                                    ((pos('AX',upper(hs))>0) or
                                    (pos('AL',upper(hs))>0)) then
                                   procinfo^.funcret_state:=vs_assigned;
                                 if (s[length(s)]<>'%') and
                                   (s[length(s)]<>'$') and
                                   ((s[length(s)]<>'0') or (hs[1]<>'x')) then
                                   begin
                                      if assigned(aktprocsym^.definition^.localst) and
                                         (lexlevel >= normal_function_level) then
                                        sym:=psym(aktprocsym^.definition^.localst^.search(upper(hs)))
                                      else
                                        sym:=nil;
                                      if assigned(sym) then
                                        begin
                                           if (sym^.typ = labelsym) then
                                             Begin
                                                hs:=plabelsym(sym)^.lab^.name;
                                             end
                                           else if sym^.typ=varsym then
                                             begin
                                             {variables set are after a comma }
                                             {like in movl %eax,I }
                                             if pos(',',s) > 0 then
                                               pvarsym(sym)^.varstate:=vs_used
                                             else
                                             if (pos('MOV',upper(s)) > 0) and (pvarsym(sym)^.varstate=vs_declared) then
                                              Message1(sym_n_uninitialized_local_variable,hs);
                                             if (vo_is_external in pvarsym(sym)^.varoptions) then
                                               hs:=pvarsym(sym)^.mangledname
                                             else
                                               hs:='-'+tostr(pvarsym(sym)^.address)+
                                                   '('+att_reg2str[procinfo^.framepointer]+')';
                                             end
                                           else
                                           { call to local function }
                                           if (sym^.typ=procsym) and ((pos('CALL',upper(s))>0) or
                                              (pos('LEA',upper(s))>0)) then
                                             begin
                                                hs:=pprocsym(sym)^.definition^.mangledname;
                                             end;
                                        end
                                      else
                                        begin
                                           if assigned(aktprocsym^.definition^.parast) then
                                             sym:=psym(aktprocsym^.definition^.parast^.search(upper(hs)))
                                           else
                                             sym:=nil;
                                           if assigned(sym) then
                                             begin
                                                if sym^.typ=varsym then
                                                  begin
                                                     l:=pvarsym(sym)^.address;
                                                     { set offset }
                                                     inc(l,aktprocsym^.definition^.parast^.address_fixup);
                                                     hs:=tostr(l)+'('+att_reg2str[procinfo^.framepointer]+')';
                                                     if pos(',',s) > 0 then
                                                       pvarsym(sym)^.varstate:=vs_used;
                                                  end;
                                             end
                                      { I added that but it creates a problem in line.ppi
                                      because there is a local label wbuffer and
                                      a static variable WBUFFER ...
                                      what would you decide, florian ?}
                                      else

                                        begin
{$ifndef IGNOREGLOBALVAR}
                                           getsym(upper(hs),false);
                                           sym:=srsym;
                                           if assigned(sym) and (sym^.owner^.symtabletype in [unitsymtable,
                                             globalsymtable,staticsymtable]) then
                                             begin
                                                if (sym^.typ = varsym) or (sym^.typ = typedconstsym) then
                                                  begin
                                                     Message2(asmr_h_direct_global_to_mangled,hs,sym^.mangledname);
                                                     hs:=sym^.mangledname;
                                                     if sym^.typ=varsym then
                                                       inc(pvarsym(sym)^.refs);
                                                  end;
                                                { procs can be called or the address can be loaded }
                                                if (sym^.typ=procsym) and
                                                   ((pos('CALL',upper(s))>0) or (pos('LEA',upper(s))>0)) then
                                                  begin
                                                     if assigned(pprocsym(sym)^.definition^.nextoverloaded) then
                                                       Message1(asmr_w_direct_global_is_overloaded_func,hs);
                                                     Message2(asmr_h_direct_global_to_mangled,hs,sym^.mangledname);
                                                     hs:=sym^.mangledname;
                                                  end;
                                             end
                                           else
{$endif TESTGLOBALVAR}
                                           if upper(hs)='__SELF' then
                                             begin
                                                if assigned(procinfo^._class) then
                                                  hs:=tostr(procinfo^.selfpointer_offset)+
                                                      '('+att_reg2str[procinfo^.framepointer]+')'
                                                else
                                                 Message(asmr_e_cannot_use_SELF_outside_a_method);
                                             end
                                           else if upper(hs)='__RESULT' then
                                             begin
                                                if assigned(procinfo^.returntype.def) and
                                                  (procinfo^.returntype.def<>pdef(voiddef)) then
                                                  hs:=retstr
                                                else
                                                  Message(asmr_e_void_function);
                                             end
                                           else if upper(hs)='__OLDEBP' then
                                             begin
                                                { complicate to check there }
                                                { we do it: }
                                                if lexlevel>normal_function_level then
                                                  hs:=tostr(procinfo^.framepointer_offset)+
                                                    '('+att_reg2str[procinfo^.framepointer]+')'
                                                else
                                                  Message(asmr_e_cannot_use_OLDEBP_outside_nested_procedure);
                                             end;
                                           end;
                                        end;
                                   end;
                              end;
                            s:=s+hs;
                         end;
                   end;
 '{',';',#10,#13 : begin
                      if pos(retstr,s) > 0 then
                        procinfo^.funcret_state:=vs_assigned;
                     writeasmline;
                     c:=current_scanner^.asmgetchar;
                   end;
             #26 : Message(scan_f_end_of_file);
             else
               begin
                 current_scanner^.gettokenpos;
                 inc(byte(s[0]));
                 s[length(s)]:=c;
                 c:=current_scanner^.asmgetchar;
               end;
           end;
         end;
       writeasmline;
       assemble:=casmnode.create(code);
     end;

end.
{
  $Log$
  Revision 1.4  2000-12-25 00:07:34  peter
    + new tlinkedlist class (merge of old tstringqueue,tcontainer and
      tlinkedlist objects)

  Revision 1.3  2000/11/29 00:30:50  florian
    * unused units removed from uses clause
    * some changes for widestrings

  Revision 1.2  2000/10/31 22:02:57  peter
    * symtable splitted, no real code changes

  Revision 1.1  2000/10/15 09:47:43  peter
    * moved to i386/

  Revision 1.5  2000/10/14 10:14:52  peter
    * moehrendorf oct 2000 rewrite

  Revision 1.4  2000/09/24 15:06:26  peter
    * use defines.inc

  Revision 1.3  2000/08/27 16:11:52  peter
    * moved some util functions from globals,cobjects to cutils
    * splitted files into finput,fmodule

  Revision 1.2  2000/07/13 11:32:48  michael
  + removed logs

}