freepascal.compiler/compiler/psystem.pas

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

    Load the system unit, create required defs for systemunit

    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 psystem;

{$i defines.inc}

interface
uses
  symbase;

procedure insertinternsyms(p : psymtable);
procedure insert_intern_types(p : psymtable);

procedure readconstdefs;
procedure createconstdefs;


implementation

uses
  globals,
  symconst,symtype,symsym,symdef,symtable,
  ninl;

procedure insertinternsyms(p : psymtable);
{
  all intern procedures for the system unit
}
begin
  p^.insert(new(psyssym,init('Concat',in_concat_x)));
  p^.insert(new(psyssym,init('Write',in_write_x)));
  p^.insert(new(psyssym,init('WriteLn',in_writeln_x)));
  p^.insert(new(psyssym,init('Assigned',in_assigned_x)));
  p^.insert(new(psyssym,init('Read',in_read_x)));
  p^.insert(new(psyssym,init('ReadLn',in_readln_x)));
  p^.insert(new(psyssym,init('Ofs',in_ofs_x)));
  p^.insert(new(psyssym,init('SizeOf',in_sizeof_x)));
  p^.insert(new(psyssym,init('TypeOf',in_typeof_x)));
  p^.insert(new(psyssym,init('Low',in_low_x)));
  p^.insert(new(psyssym,init('High',in_high_x)));
  p^.insert(new(psyssym,init('Seg',in_seg_x)));
  p^.insert(new(psyssym,init('Ord',in_ord_x)));
  p^.insert(new(psyssym,init('Pred',in_pred_x)));
  p^.insert(new(psyssym,init('Succ',in_succ_x)));
  p^.insert(new(psyssym,init('Exclude',in_exclude_x_y)));
  p^.insert(new(psyssym,init('Include',in_include_x_y)));
  p^.insert(new(psyssym,init('Break',in_break)));
  p^.insert(new(psyssym,init('Continue',in_continue)));
  p^.insert(new(psyssym,init('Dec',in_dec_x)));
  p^.insert(new(psyssym,init('Inc',in_inc_x)));
  p^.insert(new(psyssym,init('Str',in_str_x_string)));
  p^.insert(new(psyssym,init('Assert',in_assert_x_y)));
  p^.insert(new(psyssym,init('Val',in_val_x)));
  p^.insert(new(psyssym,init('Addr',in_addr_x)));
  p^.insert(new(psyssym,init('TypeInfo',in_typeinfo_x)));
  p^.insert(new(psyssym,init('SetLength',in_setlength_x)));
  p^.insert(new(psyssym,init('Finalize',in_finalize_x)));
end;


procedure insert_intern_types(p : psymtable);
{
  all the types inserted into the system unit
}

  procedure addtype(const s:string;const t:ttype);
  begin
    p^.insert(new(ptypesym,init(s,t)));
  end;

  procedure adddef(const s:string;def:pdef);
  var
    t : ttype;
  begin
    t.setdef(def);
    p^.insert(new(ptypesym,init(s,t)));
  end;

var
  { several defs to simulate more or less C++ objects for GDB }
  vmttype,
  vmtarraytype : ttype;
  vmtsymtable  : psymtable;
begin
{ Internal types }
  addtype('$formal',cformaltype);
  addtype('$void',voidtype);
  addtype('$byte',u8bittype);
  addtype('$word',u16bittype);
  addtype('$ulong',u32bittype);
  addtype('$longint',s32bittype);
  addtype('$qword',cu64bittype);
  addtype('$int64',cs64bittype);
  addtype('$char',cchartype);
  addtype('$widechar',cwidechartype);
  addtype('$shortstring',cshortstringtype);
  addtype('$longstring',clongstringtype);
  addtype('$ansistring',cansistringtype);
  addtype('$widestring',cwidestringtype);
  addtype('$openshortstring',openshortstringtype);
  addtype('$boolean',booltype);
  addtype('$void_pointer',voidpointertype);
  addtype('$char_pointer',charpointertype);
  addtype('$void_farpointer',voidfarpointertype);
  addtype('$openchararray',openchararraytype);
  addtype('$file',cfiletype);
  addtype('$variant',cvarianttype);
  addtype('$s32real',s32floattype);
  addtype('$s64real',s64floattype);
  addtype('$s80real',s80floattype);
  { Add a type for virtual method tables in lowercase }
  { so it isn't reachable!                            }
  vmtsymtable:=new(pstoredsymtable,init(recordsymtable));
  vmttype.setdef(new(precorddef,init(vmtsymtable)));
  pvmttype.setdef(new(ppointerdef,init(vmttype)));
  vmtsymtable^.insert(new(pvarsym,init('$parent',pvmttype)));
  vmtsymtable^.insert(new(pvarsym,init('$length',s32bittype)));
  vmtsymtable^.insert(new(pvarsym,init('$mlength',s32bittype)));
  vmtarraytype.setdef(new(parraydef,init(0,1,s32bittype)));
  parraydef(vmtarraytype.def)^.elementtype:=voidpointertype;
  vmtsymtable^.insert(new(pvarsym,init('$__pfn',vmtarraytype)));
  addtype('$__vtbl_ptr_type',vmttype);
  addtype('$pvmt',pvmttype);
  vmtarraytype.setdef(new(parraydef,init(0,1,s32bittype)));
  parraydef(vmtarraytype.def)^.elementtype:=pvmttype;
  addtype('$vtblarray',vmtarraytype);
{ Add functions that require compiler magic }
  insertinternsyms(p);
{ Normal types }
  addtype('Single',s32floattype);
  addtype('Double',s64floattype);
  addtype('Extended',s80floattype);
  addtype('Real',s64floattype);
{$ifdef i386}
  adddef('Comp',new(pfloatdef,init(s64comp)));
{$endif}
  addtype('Pointer',voidpointertype);
  addtype('FarPointer',voidfarpointertype);
  addtype('ShortString',cshortstringtype);
  addtype('LongString',clongstringtype);
  addtype('AnsiString',cansistringtype);
  addtype('WideString',cwidestringtype);
  addtype('Boolean',booltype);
  addtype('ByteBool',booltype);
  adddef('WordBool',new(porddef,init(bool16bit,0,1)));
  adddef('LongBool',new(porddef,init(bool32bit,0,1)));
  addtype('Char',cchartype);
  addtype('WideChar',cwidechartype);
  adddef('Text',new(pfiledef,inittext));
  addtype('Cardinal',u32bittype);
  addtype('QWord',cu64bittype);
  addtype('Int64',cs64bittype);
  adddef('TypedFile',new(pfiledef,inittyped(voidtype)));
  addtype('Variant',cvarianttype);
end;


procedure readconstdefs;
{
  Load all default definitions for consts from the system unit
}
begin
  globaldef('byte',u8bittype);
  globaldef('word',u16bittype);
  globaldef('ulong',u32bittype);
  globaldef('longint',s32bittype);
  globaldef('qword',cu64bittype);
  globaldef('int64',cs64bittype);
  globaldef('formal',cformaltype);
  globaldef('void',voidtype);
  globaldef('char',cchartype);
  globaldef('widechar',cwidechartype);
  globaldef('shortstring',cshortstringtype);
  globaldef('longstring',clongstringtype);
  globaldef('ansistring',cansistringtype);
  globaldef('widestring',cwidestringtype);
  globaldef('openshortstring',openshortstringtype);
  globaldef('openchararray',openchararraytype);
  globaldef('s32real',s32floattype);
  globaldef('s64real',s64floattype);
  globaldef('s80real',s80floattype);
  globaldef('boolean',booltype);
  globaldef('void_pointer',voidpointertype);
  globaldef('char_pointer',charpointertype);
  globaldef('void_farpointer',voidfarpointertype);
  globaldef('file',cfiletype);
  globaldef('pvmt',pvmttype);
  globaldef('variant',cvarianttype);
end;


procedure createconstdefs;
{
  Create all default definitions for consts for the system unit
}
var
  oldregisterdef : boolean;
begin
  { create definitions for constants }
  oldregisterdef:=registerdef;
  registerdef:=false;
  cformaltype.setdef(new(pformaldef,init));
  voidtype.setdef(new(porddef,init(uvoid,0,0)));
  u8bittype.setdef(new(porddef,init(u8bit,0,255)));
  u16bittype.setdef(new(porddef,init(u16bit,0,65535)));
  u32bittype.setdef(new(porddef,init(u32bit,0,longint($ffffffff))));
  s32bittype.setdef(new(porddef,init(s32bit,longint($80000000),$7fffffff)));
  cu64bittype.setdef(new(porddef,init(u64bit,0,0)));
  cs64bittype.setdef(new(porddef,init(s64bit,0,0)));
  booltype.setdef(new(porddef,init(bool8bit,0,1)));
  cchartype.setdef(new(porddef,init(uchar,0,255)));
  cwidechartype.setdef(new(porddef,init(uwidechar,0,65535)));
  cshortstringtype.setdef(new(pstringdef,shortinit(255)));
  { should we give a length to the default long and ansi string definition ?? }
  clongstringtype.setdef(new(pstringdef,longinit(-1)));
  cansistringtype.setdef(new(pstringdef,ansiinit(-1)));
  cwidestringtype.setdef(new(pstringdef,wideinit(-1)));
  { length=0 for shortstring is open string (needed for readln(string) }
  openshortstringtype.setdef(new(pstringdef,shortinit(0)));
  openchararraytype.setdef(new(parraydef,init(0,-1,s32bittype)));
  parraydef(openchararraytype.def)^.elementtype:=cchartype;
{$ifdef i386}
  s32floattype.setdef(new(pfloatdef,init(s32real)));
  s64floattype.setdef(new(pfloatdef,init(s64real)));
  s80floattype.setdef(new(pfloatdef,init(s80real)));
{$endif}
{$ifdef m68k}
  s32floattype.setdef(new(pfloatdef,init(s32real)));
  s64floattype.setdef(new(pfloatdef,init(s64real)));
  if (cs_fp_emulation in aktmoduleswitches) then
   s80floattype.setdef(new(pfloatdef,init(s32real)))
  else
   s80floattype.setdef(new(pfloatdef,init(s80real)));
{$endif}
  { some other definitions }
  voidpointertype.setdef(new(ppointerdef,init(voidtype)));
  charpointertype.setdef(new(ppointerdef,init(cchartype)));
  voidfarpointertype.setdef(new(ppointerdef,initfar(voidtype)));
  cfiletype.setdef(new(pfiledef,inituntyped));
  cvarianttype.setdef(new(pvariantdef,init));
  registerdef:=oldregisterdef;
end;


end.
{
  $Log$
  Revision 1.14  2001-04-02 21:20:34  peter
    * resulttype rewrite

  Revision 1.13  2001/03/25 12:40:00  florian
    * cwidechar was loaded with a chardef, fixed

  Revision 1.12  2001/03/22 00:10:58  florian
    + basic variant type support in the compiler

  Revision 1.11  2000/12/07 17:19:43  jonas
    * new constant handling: from now on, hex constants >$7fffffff are
      parsed as unsigned constants (otherwise, $80000000 got sign extended
      and became $ffffffff80000000), all constants in the longint range
      become longints, all constants >$7fffffff and <=cardinal($ffffffff)
      are cardinals and the rest are int64's.
    * added lots of longint typecast to prevent range check errors in the
      compiler and rtl
    * type casts of symbolic ordinal constants are now preserved
    * fixed bug where the original resulttype.def wasn't restored correctly
      after doing a 64bit rangecheck

  Revision 1.10  2000/11/29 00:30:38  florian
    * unused units removed from uses clause
    * some changes for widestrings

  Revision 1.9  2000/11/09 17:46:56  florian
    * System.TypeInfo fixed
    + System.Finalize implemented
    + some new keywords for interface support added

  Revision 1.8  2000/10/31 22:02:51  peter
    * symtable splitted, no real code changes

  Revision 1.7  2000/10/21 18:16:12  florian
    * a lot of changes:
       - basic dyn. array support
       - basic C++ support
       - some work for interfaces done
       ....

  Revision 1.6  2000/10/14 10:14:52  peter
    * moehrendorf oct 2000 rewrite

  Revision 1.5  2000/09/24 15:06:24  peter
    * use defines.inc

  Revision 1.4  2000/08/27 20:19:39  peter
    * store strings with case in ppu, when an internal symbol is created
      a '$' is prefixed so it's not automatic uppercased

  Revision 1.3  2000/08/16 13:06:06  florian
    + support of 64 bit integer constants

  Revision 1.2  2000/07/13 11:32:47  michael
  + removed logs

}