fpc/compiler/import.pas

{
    $Id$
    Copyright (c) 1998-2000 by Peter Vreman

    This unit implements an uniform import object

    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 import;
interface

uses
  cobjects{$IFDEF NEWST},objects{$ENDIF NEWST};

type
   pimported_item = ^timported_item;
   timported_item = object(tlinkedlist_item)
      ordnr  : word;
      name,
      func   : pstring;
      lab    : pointer; { should be plabel, but this gaves problems with circular units }
      is_var : boolean;
      constructor init(const n,s : string;o : word);
      constructor init_var(const n,s : string);
      destructor done;virtual;
   end;

   pimportlist = ^timportlist;
   timportlist = object(tlinkedlist_item)
      dllname : pstring;
      imported_items : plinkedlist;
      constructor init(const n : string);
      destructor done;virtual;
   end;

   pimportlib=^timportlib;
   timportlib=object
   private
      notsupmsg : boolean;
      procedure NotSupported;
   public
      constructor Init;
      destructor Done;
      procedure preparelib(const s:string);virtual;
      procedure importprocedure(const func,module:string;index:longint;const name:string);virtual;
      procedure importvariable(const varname,module:string;const name:string);virtual;
      procedure generatelib;virtual;
      procedure generatesmartlib;virtual;
   end;

var
  importlib : pimportlib;

procedure InitImport;
procedure DoneImport;

implementation

uses
  systems,verbose,globals
{$ifdef i386}
  {$ifndef NOTARGETLINUX}
    ,t_linux
  {$endif}
  {$ifndef NOTARGETOS2}
    ,t_os2
  {$endif}
  {$ifndef NOTARGETWIN32}
    ,t_win32
  {$endif}
  {$ifndef NOTARGETGO32V2}
    ,t_go32v2
  {$endif}
{$endif}
{$ifdef m68k}
  {$ifndef NOTARGETLINUX}
    ,t_linux
  {$endif}
{$endif}
{$ifdef powerpc}
  {$ifndef NOTARGETLINUX}
    ,t_linux
  {$endif}
{$endif}
{$ifdef alpha}
  {$ifndef NOTARGETLINUX}
    ,t_linux
  {$endif}
{$endif}
  ;

{****************************************************************************
                           Timported_item
****************************************************************************}

constructor timported_item.init(const n,s : string;o : word);
begin
  inherited init;
  func:=stringdup(n);
  name:=stringdup(s);
  ordnr:=o;
  lab:=nil;
  is_var:=false;
end;


constructor timported_item.init_var(const n,s : string);
begin
  inherited init;
  func:=stringdup(n);
  name:=stringdup(s);
  ordnr:=0;
  lab:=nil;
  is_var:=true;
end;


destructor timported_item.done;
begin
  stringdispose(name);
  stringdispose(func);
  inherited done;
end;


{****************************************************************************
                              TImportlist
****************************************************************************}

constructor timportlist.init(const n : string);
begin
  inherited init;
  dllname:=stringdup(n);
  imported_items:=new(plinkedlist,init);
end;


destructor timportlist.done;
begin
  dispose(imported_items,done);
  stringdispose(dllname);
end;


{****************************************************************************
                              TImportLib
****************************************************************************}

constructor timportlib.Init;
begin
  notsupmsg:=false;
end;


destructor timportlib.Done;
begin
end;


procedure timportlib.NotSupported;
begin
  { show the message only once }
  if not notsupmsg then
   begin
     Message(exec_e_dll_not_supported);
     notsupmsg:=true;
   end;
end;


procedure timportlib.preparelib(const s:string);
begin
  NotSupported;
end;


procedure timportlib.importprocedure(const func,module:string;index:longint;const name:string);
begin
  NotSupported;
end;


procedure timportlib.importvariable(const varname,module:string;const name:string);
begin
  NotSupported;
end;


procedure timportlib.generatelib;
begin
  NotSupported;
end;


procedure timportlib.generatesmartlib;
begin
  NotSupported;
end;


procedure DoneImport;
begin
  if assigned(importlib) then
    dispose(importlib,done);
end;


procedure InitImport;
begin
  case target_info.target of
{$ifdef i386}
    target_i386_Linux :
      importlib:=new(pimportliblinux,Init);
    target_i386_Win32 :
      importlib:=new(pimportlibwin32,Init);
    target_i386_OS2 :
      importlib:=new(pimportlibos2,Init);
{$endif i386}
{$ifdef m68k}
    target_m68k_Linux :
      importlib:=new(pimportliblinux,Init);
{$endif m68k}
{$ifdef alpha}
    target_alpha_Linux :
      importlib:=new(pimportliblinux,Init);
{$endif alpha}
{$ifdef powerpc}
    target_alpha_Linux :
      importlib:=new(pimportliblinux,Init);
{$endif powerpc}
    else
      importlib:=new(pimportlib,Init);
  end;
end;


end.
{
  $Log$
  Revision 1.19  2000-02-28 17:23:57  daniel
  * Current work of symtable integration committed. The symtable can be
    activated by defining 'newst', but doesn't compile yet. Changes in type
    checking and oop are completed. What is left is to write a new
    symtablestack and adapt the parser to use it.

  Revision 1.18  2000/02/09 13:22:54  peter
    * log truncated

  Revision 1.17  2000/01/12 10:34:29  peter
    * only give unsupported error once

  Revision 1.16  2000/01/07 01:14:27  peter
    * updated copyright to 2000

  Revision 1.15  1999/11/06 14:34:21  peter
    * truncated log to 20 revs

  Revision 1.14  1999/11/02 15:06:57  peter
    * import library fixes for win32
    * alignment works again

  Revision 1.13  1999/10/21 14:29:34  peter
    * redesigned linker object
    + library support for linux (only procedures can be exported)

  Revision 1.12  1999/08/04 13:02:44  jonas
    * all tokens now start with an underscore
    * PowerPC compiles!!

  Revision 1.11  1999/08/03 13:50:16  michael
  + Changes for alpha

}