{
    $Id$
    Copyright (c) 1998-2002 by Florian Klaempfl

    This unit implements the first loading and searching of the modules

    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 fmodule;

{$i fpcdefs.inc}

{$ifdef go32v2}
  {$define shortasmprefix}
{$endif}
{$ifdef OS2}
  { Allthough OS/2 supports long filenames I play it safe and
    use 8.3 filenames, because this allows the compiler to run
    on a FAT partition. (DM) }
  {$define shortasmprefix}
{$endif}

interface

    uses
       cutils,cclasses,
       globals,finput,
       symbase,aasmbase;

    const
       maxunits = 1024;

    type
       trecompile_reason = (rr_unknown,
         rr_noppu,rr_sourcenewer,rr_build,rr_crcchanged
       );

       TExternalsItem=class(TLinkedListItem)
       public
         found : longbool;
         data  : pstring;
         constructor Create(const s:string);
         Destructor Destroy;override;
       end;

       tlinkcontaineritem=class(tlinkedlistitem)
       public
          data : pstring;
          needlink : cardinal;
          constructor Create(const s:string;m:cardinal);
          destructor Destroy;override;
       end;

       tlinkcontainer=class(tlinkedlist)
          procedure add(const s : string;m:cardinal);
          function get(var m:cardinal) : string;
          function getusemask(mask:cardinal) : string;
          function find(const s:string):boolean;
       end;

{$ifndef NEWMAP}
       tunitmap = array[0..maxunits-1] of pointer;
       punitmap = ^tunitmap;
{$else NEWMAP}
       tunitmap = array[0..maxunits-1] of tmodule;
       punitmap = ^tunitmap;
{$endif NEWMAP}

       tmodule = class(tmodulebase)
          compiled,                 { unit is already compiled }
          do_reload,                { force reloading of the unit }
          do_compile,               { need to compile the sources }
          sources_avail,            { if all sources are reachable }
          sources_checked,          { if there is already done a check for the sources }
          is_unit,
          in_second_compile,        { is this unit being compiled for the 2nd time? }
          in_second_load,           { is this unit PPU loaded a 2nd time? }
          in_implementation,        { processing the implementation part? }
          in_global     : boolean;  { allow global settings }
          recompile_reason : trecompile_reason;  { the reason why the unit should be recompiled }
          crc,
          interface_crc : cardinal;
          flags         : cardinal;  { the PPU flags }
          islibrary     : boolean;  { if it is a library (win32 dll) }
          map           : punitmap; { mapping of all used units }
          unitcount     : longint;  { local unit counter }
          globalsymtable,           { pointer to the global symtable of this unit }
          localsymtable : tsymtable;{ pointer to the local symtable of this unit }
          scanner       : pointer;  { scanner object used }
          loaded_from   : tmodule;
          uses_imports  : boolean;  { Set if the module imports from DLL's.}
          imports       : tlinkedlist;
          _exports      : tlinkedlist;
          externals     : tlinkedlist; {Only for DLL scanners by using Unix-style $LINKLIB }
          resourcefiles : tstringlist;

          linkunitofiles,
          linkunitstaticlibs,
          linkunitsharedlibs,
          linkotherofiles,           { objects,libs loaded from the source }
          linkothersharedlibs,       { using $L or $LINKLIB or import lib (for linux) }
          linkotherstaticlibs  : tlinkcontainer;

          used_units           : tlinkedlist;
          dependent_units      : tlinkedlist;

          localunitsearchpath,           { local searchpaths }
          localobjectsearchpath,
          localincludesearchpath,
          locallibrarysearchpath : TSearchPathList;

          asmprefix     : pstring;  { prefix for the smartlink asmfiles }
          librarydata   : tasmlibrarydata;   { librarydata for this module }
          constructor create(const s:string;_is_unit:boolean);
          destructor destroy;override;
          procedure reset;virtual;
          procedure numberunits;
       end;

       tused_unit = class(tlinkedlistitem)
          unitid          : longint;
          name            : pstring;
          realname        : pstring;
          checksum,
          interface_checksum : cardinal;
          loaded          : boolean;
          in_uses,
          in_interface,
          is_stab_written : boolean;
          u               : tmodule;
          constructor create(_u : tmodule;intface:boolean);
          constructor create_to_load(const n:string;c,intfc:cardinal;intface:boolean);
          destructor destroy;override;
       end;

       tdependent_unit = class(tlinkedlistitem)
          u : tmodule;
          constructor create(_u : tmodule);
       end;

    var
       main_module       : tmodule;     { Main module of the program }
       current_module    : tmodule;     { Current module which is compiled or loaded }
       compiled_module   : tmodule;     { Current module which is compiled }
       usedunits         : tlinkedlist; { Used units for this program }
       loaded_units      : tlinkedlist; { All loaded units }
       SmartLinkOFiles   : TStringList; { List of .o files which are generated,
                                          used to delete them after linking }

function get_source_file(moduleindex,fileindex : longint) : tinputfile;


implementation

uses
{$ifdef delphi}
  dmisc,
{$else}
  dos,
{$endif}
  verbose,systems,
  scanner;


{*****************************************************************************
                             Global Functions
*****************************************************************************}

    function get_source_file(moduleindex,fileindex : longint) : tinputfile;
      var
         hp : tmodule;
      begin
         hp:=tmodule(loaded_units.first);
         while assigned(hp) and (hp.unit_index<>moduleindex) do
           hp:=tmodule(hp.next);
         if assigned(hp) then
          get_source_file:=hp.sourcefiles.get_file(fileindex)
         else
          get_source_file:=nil;
      end;


{****************************************************************************
                             TLinkContainerItem
 ****************************************************************************}

    constructor TLinkContainerItem.Create(const s:string;m:cardinal);
      begin
        inherited Create;
        data:=stringdup(s);
        needlink:=m;
      end;


    destructor TLinkContainerItem.Destroy;
      begin
        stringdispose(data);
      end;


{****************************************************************************
                           TLinkContainer
 ****************************************************************************}

    procedure TLinkContainer.add(const s : string;m:cardinal);
      begin
        inherited concat(TLinkContainerItem.Create(s,m));
      end;


    function TLinkContainer.get(var m:cardinal) : string;
      var
        p : tlinkcontaineritem;
      begin
        p:=tlinkcontaineritem(inherited getfirst);
        if p=nil then
         begin
           get:='';
           m:=0;
         end
        else
         begin
           get:=p.data^;
           m:=p.needlink;
           p.free;
         end;
      end;


    function TLinkContainer.getusemask(mask:cardinal) : string;
      var
         p : tlinkcontaineritem;
         found : boolean;
      begin
        found:=false;
        repeat
          p:=tlinkcontaineritem(inherited getfirst);
          if p=nil then
           begin
             getusemask:='';
             exit;
           end;
          getusemask:=p.data^;
          found:=(p.needlink and mask)<>0;
          p.free;
        until found;
      end;


    function TLinkContainer.find(const s:string):boolean;
      var
        newnode : tlinkcontaineritem;
      begin
        find:=false;
        newnode:=tlinkcontaineritem(First);
        while assigned(newnode) do
         begin
           if newnode.data^=s then
            begin
              find:=true;
              exit;
            end;
           newnode:=tlinkcontaineritem(newnode.next);
         end;
      end;


{****************************************************************************
                              TExternalsItem
 ****************************************************************************}

    constructor tExternalsItem.Create(const s:string);
      begin
        inherited Create;
        found:=false;
        data:=stringdup(s);
      end;


    destructor tExternalsItem.Destroy;
      begin
        stringdispose(data);
        inherited;
      end;


{****************************************************************************
                              TUSED_UNIT
 ****************************************************************************}

    constructor tused_unit.create(_u : tmodule;intface:boolean);
      begin
        u:=_u;
        in_interface:=intface;
        in_uses:=false;
        is_stab_written:=false;
        loaded:=true;
        name:=stringdup(_u.modulename^);
        realname:=stringdup(_u.realmodulename^);
        checksum:=_u.crc;
        interface_checksum:=_u.interface_crc;
        unitid:=0;
      end;


    constructor tused_unit.create_to_load(const n:string;c,intfc:cardinal;intface:boolean);
      begin
        u:=nil;
        in_interface:=intface;
        in_uses:=false;
        is_stab_written:=false;
        loaded:=false;
        name:=stringdup(upper(n));
        realname:=stringdup(n);
        checksum:=c;
        interface_checksum:=intfc;
        unitid:=0;
      end;


    destructor tused_unit.destroy;
      begin
        stringdispose(realname);
        stringdispose(name);
        inherited destroy;
      end;


{****************************************************************************
                            TDENPENDENT_UNIT
 ****************************************************************************}

    constructor tdependent_unit.create(_u : tmodule);
      begin
         u:=_u;
      end;


{****************************************************************************
                                  TMODULE
 ****************************************************************************}

    constructor tmodule.create(const s:string;_is_unit:boolean);
      var
        p : dirstr;
        n : namestr;
        e : extstr;
      begin
        FSplit(s,p,n,e);
        { Programs have the name 'Program' to don't conflict with dup id's }
        if _is_unit then
         inherited create(n)
        else
         inherited create('Program');
        mainsource:=stringdup(s);
        { Dos has the famous 8.3 limit :( }
{$ifdef shortasmprefix}
        asmprefix:=stringdup(FixFileName('as'));
{$else}
        asmprefix:=stringdup(FixFileName(n));
{$endif}
        setfilename(p+n,true);
        localunitsearchpath:=TSearchPathList.Create;
        localobjectsearchpath:=TSearchPathList.Create;
        localincludesearchpath:=TSearchPathList.Create;
        locallibrarysearchpath:=TSearchPathList.Create;
        used_units:=TLinkedList.Create;
        dependent_units:=TLinkedList.Create;
        resourcefiles:=TStringList.Create;
        linkunitofiles:=TLinkContainer.Create;
        linkunitstaticlibs:=TLinkContainer.Create;
        linkunitsharedlibs:=TLinkContainer.Create;
        linkotherofiles:=TLinkContainer.Create;
        linkotherstaticlibs:=TLinkContainer.Create;
        linkothersharedlibs:=TLinkContainer.Create;
        crc:=0;
        interface_crc:=0;
        flags:=0;
        scanner:=nil;
        map:=nil;
        globalsymtable:=nil;
        localsymtable:=nil;
        loaded_from:=nil;
        do_reload:=false;
        unitcount:=1;
        do_compile:=false;
        sources_avail:=true;
        sources_checked:=false;
        compiled:=false;
        recompile_reason:=rr_unknown;
        in_second_load:=false;
        in_second_compile:=false;
        in_implementation:=false;
        in_global:=true;
        is_unit:=_is_unit;
        islibrary:=false;
        uses_imports:=false;
        imports:=TLinkedList.Create;
        _exports:=TLinkedList.Create;
        externals:=TLinkedList.Create;
        librarydata:=tasmlibrarydata.create(realmodulename^);
      end;


    destructor tmodule.Destroy;
{$ifdef MEMDEBUG}
      var
        d : tmemdebug;
{$endif}
      begin
        if assigned(map) then
         dispose(map);
        if assigned(imports) then
         imports.free;
        if assigned(_exports) then
         _exports.free;
        if assigned(externals) then
         externals.free;
        if assigned(scanner) then
         begin
            { also update current_scanner if it was pointing
              to this module }
            if current_scanner=tscannerfile(scanner) then
             current_scanner:=nil;
            tscannerfile(scanner).free;
         end;
        used_units.free;
        dependent_units.free;
        resourcefiles.Free;
        linkunitofiles.Free;
        linkunitstaticlibs.Free;
        linkunitsharedlibs.Free;
        linkotherofiles.Free;
        linkotherstaticlibs.Free;
        linkothersharedlibs.Free;
        stringdispose(objfilename);
        stringdispose(newfilename);
        stringdispose(ppufilename);
        stringdispose(staticlibfilename);
        stringdispose(sharedlibfilename);
        stringdispose(exefilename);
        stringdispose(outputpath);
        stringdispose(path);
        stringdispose(realmodulename);
        stringdispose(mainsource);
        stringdispose(asmprefix);
        localunitsearchpath.Free;
        localobjectsearchpath.free;
        localincludesearchpath.free;
        locallibrarysearchpath.free;
{$ifdef MEMDEBUG}
        d:=tmemdebug.create(modulename^+' - symtable');
{$endif}
        if assigned(globalsymtable) then
          globalsymtable.free;
        if assigned(localsymtable) then
          localsymtable.free;
{$ifdef MEMDEBUG}
        d.free;
{$endif}
{$ifdef MEMDEBUG}
        d:=tmemdebug.create(modulename^+' - librarydata');
{$endif}
        librarydata.free;
{$ifdef MEMDEBUG}
        d.free;
{$endif}
        stringdispose(modulename);
        inherited Destroy;
      end;


    procedure tmodule.reset;
      var
         pm : tdependent_unit;
      begin
        if assigned(scanner) then
          begin
            { also update current_scanner if it was pointing
              to this module }
            if current_scanner=tscannerfile(scanner) then
             current_scanner:=nil;
            tscannerfile(scanner).free;
            scanner:=nil;
          end;
        if assigned(globalsymtable) then
          begin
            globalsymtable.free;
            globalsymtable:=nil;
          end;
        if assigned(localsymtable) then
          begin
            localsymtable.free;
            localsymtable:=nil;
          end;
        if assigned(map) then
         begin
           dispose(map);
           map:=nil;
         end;
        sourcefiles.free;
        sourcefiles:=tinputfilemanager.create;
        librarydata.free;
        librarydata:=tasmlibrarydata.create(realmodulename^);
        imports.free;
        imports:=tlinkedlist.create;
        _exports.free;
        _exports:=tlinkedlist.create;
        externals.free;
        externals:=tlinkedlist.create;
        used_units.free;
        used_units:=TLinkedList.Create;
        { all units that depend on this one must be recompiled ! }
        pm:=tdependent_unit(dependent_units.first);
        while assigned(pm) do
          begin
            if pm.u.in_second_compile then
             Comment(v_debug,'No reload already in second compile: '+pm.u.modulename^)
            else
             begin
               pm.u.do_reload:=true;
               Comment(v_debug,'Reloading '+pm.u.modulename^+' needed because '+modulename^+' is reloaded');
             end;
            pm:=tdependent_unit(pm.next);
          end;
        dependent_units.free;
        dependent_units:=TLinkedList.Create;
        resourcefiles.Free;
        resourcefiles:=TStringList.Create;
        linkunitofiles.Free;
        linkunitofiles:=TLinkContainer.Create;
        linkunitstaticlibs.Free;
        linkunitstaticlibs:=TLinkContainer.Create;
        linkunitsharedlibs.Free;
        linkunitsharedlibs:=TLinkContainer.Create;
        linkotherofiles.Free;
        linkotherofiles:=TLinkContainer.Create;
        linkotherstaticlibs.Free;
        linkotherstaticlibs:=TLinkContainer.Create;
        linkothersharedlibs.Free;
        linkothersharedlibs:=TLinkContainer.Create;
        uses_imports:=false;
        do_compile:=false;
        { sources_avail:=true;
        should not be changed PM }
        compiled:=false;
        in_implementation:=false;
        in_global:=true;
        crc:=0;
        interface_crc:=0;
        flags:=0;
        {loaded_from:=nil;
        should not be changed PFV }
        unitcount:=1;
        recompile_reason:=rr_unknown;
      end;


    procedure tmodule.numberunits;
      var
        counter : longint;
        hp      : tused_unit;
        hp1     : tmodule;
      begin
        { Reset all numbers to -1 }
        hp1:=tmodule(loaded_units.first);
        while assigned(hp1) do
         begin
           if assigned(hp1.globalsymtable) then
             hp1.globalsymtable.unitid:=$ffff;
           hp1:=tmodule(hp1.next);
         end;
        { Our own symtable gets unitid 0, for a program there is
          no globalsymtable }
        if assigned(globalsymtable) then
          globalsymtable.unitid:=0;
        { number units }
        counter:=1;
        hp:=tused_unit(used_units.first);
        while assigned(hp) do
         begin
           tsymtable(hp.u.globalsymtable).unitid:=counter;
           inc(counter);
           hp:=tused_unit(hp.next);
         end;
      end;


end.
{
  $Log$
  Revision 1.28  2002-09-05 19:29:42  peter
    * memdebug enhancements

  Revision 1.27  2002/08/16 15:31:08  peter
    * fixed possible crashes with current_scanner

  Revision 1.26  2002/08/12 16:46:04  peter
    * tscannerfile is now destroyed in tmodule.reset and current_scanner
      is updated accordingly. This removes all the loading and saving of
      the old scanner and the invalid flag marking

  Revision 1.25  2002/08/11 14:28:19  peter
    * TScannerFile.SetInvalid added that will also reset inputfile

  Revision 1.24  2002/08/11 13:24:11  peter
    * saving of asmsymbols in ppu supported
    * asmsymbollist global is removed and moved into a new class
      tasmlibrarydata that will hold the info of a .a file which
      corresponds with a single module. Added librarydata to tmodule
      to keep the library info stored for the module. In the future the
      objectfiles will also be stored to the tasmlibrarydata class
    * all getlabel/newasmsymbol and friends are moved to the new class

  Revision 1.23  2002/05/16 19:46:36  carl
  + defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
  + try to fix temp allocation (still in ifdef)
  + generic constructor calls
  + start of tassembler / tmodulebase class cleanup

  Revision 1.22  2002/05/14 19:34:41  peter
    * removed old logs and updated copyright year

  Revision 1.21  2002/04/04 19:05:55  peter
    * removed unused units
    * use tlocation.size in cg.a_*loc*() routines

  Revision 1.20  2002/03/28 20:46:59  carl
  - remove go32v1 support

}