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

    This unit implements support import,export,link routines
    for the (i386) Go32v2 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 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 t_go32v2;

  interface
  uses
    link;

  type
    plinkergo32v2=^tlinkergo32v2;
    tlinkergo32v2=object(tlinker)
    private
       Function  WriteResponseFile(isdll:boolean) : Boolean;
    public
       constructor Init;
       procedure SetDefaultInfo;virtual;
       function  MakeExecutable:boolean;virtual;
    end;


  implementation

    uses
       strings,globtype,globals,cobjects,systems,verbose,script,files;


{****************************************************************************
                               TLinkerGo32v2
****************************************************************************}

Constructor TLinkerGo32v2.Init;
begin
  Inherited Init;
  { allow duplicated libs (PM) }
  SharedLibFiles.doubles:=true;
  StaticLibFiles.doubles:=true;
end;


procedure TLinkerGo32v2.SetDefaultInfo;
begin
  with Info do
   begin
     ExeCmd[1]:='ld -oformat coff-go32-exe $OPT $STRIP -o $EXE @$RES';
   end;
end;


Function TLinkerGo32v2.WriteResponseFile(isdll:boolean) : Boolean;
Var
  linkres  : TLinkRes;
  i        : longint;
{$IFDEF NEWST}
  HPath    : PStringItem;
{$ELSE}
  HPath    : PStringQueueItem;
{$ENDIF NEWST}
  s        : string;
  linklibc : boolean;
begin
  WriteResponseFile:=False;

  { Open link.res file }
  LinkRes.Init(outputexedir+Info.ResName);

  { Write path to search libraries }
  HPath:=current_module^.locallibrarysearchpath.First;
  while assigned(HPath) do
   begin
     LinkRes.Add('-L'+GetShortName(HPath^.Data^));
     HPath:=HPath^.Next;
   end;
  HPath:=LibrarySearchPath.First;
  while assigned(HPath) do
   begin
     LinkRes.Add('-L'+GetShortName(HPath^.Data^));
     HPath:=HPath^.Next;
   end;

  { add objectfiles, start with prt0 always }
  LinkRes.AddFileName(GetShortName(FindObjectFile('prt0')));
  while not ObjectFiles.Empty do
   begin
     s:=ObjectFiles.Get;
     if s<>'' then
      LinkRes.AddFileName(GetShortName(s));
   end;

  { Write staticlibraries }
  if not StaticLibFiles.Empty then
   begin
     LinkRes.Add('-(');
     While not StaticLibFiles.Empty do
      begin
        S:=StaticLibFiles.Get;
        LinkRes.AddFileName(GetShortName(s))
      end;
     LinkRes.Add('-)');
   end;

  { Write sharedlibraries like -l<lib>, also add the needed dynamic linker
    here to be sure that it gets linked this is needed for glibc2 systems (PFV) }
  linklibc:=false;
  While not SharedLibFiles.Empty do
   begin
     S:=SharedLibFiles.Get;
     if s<>'c' then
      begin
        i:=Pos(target_os.sharedlibext,S);
        if i>0 then
         Delete(S,i,255);
        LinkRes.Add('-l'+s);
      end
     else
      begin
        LinkRes.Add('-l'+s);
        linklibc:=true;
      end;
   end;
  { be sure that libc&libgcc is the last lib }
  if linklibc then
   begin
     LinkRes.Add('-lc');
     LinkRes.Add('-lgcc');
   end;

{ Write and Close response }
  linkres.writetodisk;
  linkres.done;

  WriteResponseFile:=True;
end;


function TLinkerGo32v2.MakeExecutable:boolean;
var
  binstr,
  cmdstr  : string;
  success : boolean;
  StripStr : string[40];
begin
  if not(cs_link_extern in aktglobalswitches) then
   Message1(exec_i_linking,current_module^.exefilename^);

{ Create some replacements }
  StripStr:='';
  if (cs_link_strip in aktglobalswitches) then
   StripStr:='-s';

{ Write used files and libraries }
  WriteResponseFile(false);

{ Call linker }
  SplitBinCmd(Info.ExeCmd[1],binstr,cmdstr);
  Replace(cmdstr,'$EXE',current_module^.exefilename^);
  Replace(cmdstr,'$OPT',Info.ExtraOptions);
  Replace(cmdstr,'$RES',outputexedir+Info.ResName);
  Replace(cmdstr,'$STRIP',StripStr);
  success:=DoExec(FindUtil(BinStr),cmdstr,true,false);

{ Remove ReponseFile }
  if (success) and not(cs_link_extern in aktglobalswitches) then
   RemoveFile(outputexedir+Info.ResName);

  MakeExecutable:=success;   { otherwise a recursive call to link method }
end;


{$ifdef notnecessary}
procedure tlinkergo32v2.postprocessexecutable(const n : string);
type
  tcoffheader=packed record
    mach   : word;
    nsects : word;
    time   : longint;
    sympos : longint;
    syms   : longint;
    opthdr : word;
    flag   : word;
  end;
  tcoffsechdr=packed record
    name     : array[0..7] of char;
    vsize    : longint;
    rvaofs   : longint;
    datalen  : longint;
    datapos  : longint;
    relocpos : longint;
    lineno1  : longint;
    nrelocs  : word;
    lineno2  : word;
    flags    : longint;
  end;
  psecfill=^tsecfill;
  tsecfill=record
    fillpos,
    fillsize : longint;
    next : psecfill;
  end;
var
  f : file;
  coffheader : tcoffheader;
  firstsecpos,
  maxfillsize,
  l : longint;
  coffsec : tcoffsechdr;
  secroot,hsecroot : psecfill;
  zerobuf : pointer;
begin
  { when -s is used quit, because there is no .exe }
  if cs_link_extern in aktglobalswitches then
   exit;
  { open file }
  assign(f,n);
  {$I-}
   reset(f,1);
  if ioresult<>0 then
    Message1(execinfo_f_cant_open_executable,n);
  { read headers }
  seek(f,2048);
  blockread(f,coffheader,sizeof(tcoffheader));
  { read section info }
  maxfillsize:=0;
  firstsecpos:=0;
  secroot:=nil;
  for l:=1to coffheader.nSects do
   begin
     blockread(f,coffsec,sizeof(tcoffsechdr));
     if coffsec.datapos>0 then
      begin
        if secroot=nil then
         firstsecpos:=coffsec.datapos;
        new(hsecroot);
        hsecroot^.fillpos:=coffsec.datapos+coffsec.vsize;
        hsecroot^.fillsize:=coffsec.datalen-coffsec.vsize;
        hsecroot^.next:=secroot;
        secroot:=hsecroot;
        if secroot^.fillsize>maxfillsize then
         maxfillsize:=secroot^.fillsize;
      end;
   end;
  if firstsecpos>0 then
   begin
     l:=firstsecpos-filepos(f);
     if l>maxfillsize then
      maxfillsize:=l;
   end
  else
   l:=0;
  { get zero buffer }
  getmem(zerobuf,maxfillsize);
  fillchar(zerobuf^,maxfillsize,0);
  { zero from sectioninfo until first section }
  blockwrite(f,zerobuf^,l);
  { zero section alignments }
  while assigned(secroot) do
   begin
     seek(f,secroot^.fillpos);
     blockwrite(f,zerobuf^,secroot^.fillsize);
     hsecroot:=secroot;
     secroot:=secroot^.next;
     dispose(hsecroot);
   end;
  freemem(zerobuf,maxfillsize);
  close(f);
  {$I+}
  i:=ioresult;
  postprocessexecutable:=true;
end;
{$endif}

end.
{
  $Log$
  Revision 1.10  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 1.9  2000/02/09 13:23:06  peter
    * log truncated

  Revision 1.8  2000/01/09 00:55:51  pierre
    * GROUP of smartlink units put before the C libraries
      to allow for smartlinking code that uses C code.

  Revision 1.7  2000/01/07 01:14:42  peter
    * updated copyright to 2000

  Revision 1.6  1999/12/06 18:21:04  peter
    * support !ENVVAR for long commandlines
    * win32/go32v2 write short pathnames to link.res so c:\Program Files\ is
      finally supported as installdir.

  Revision 1.5  1999/11/16 23:39:04  peter
    * use outputexedir for link.res location

  Revision 1.4  1999/11/12 11:03:50  peter
    * searchpaths changed to stringqueue object

  Revision 1.3  1999/11/04 10:55:31  peter
    * TSearchPathString for the string type of the searchpaths, which is
      ansistring under FPC/Delphi

  Revision 1.2  1999/10/22 14:42:40  peter
    * reset linklibc

  Revision 1.1  1999/10/21 14:29:38  peter
    * redesigned linker object
    + library support for linux (only procedures can be exported)

}