freepascal.compiler/compiler/fmodule.pas

{
    $Id$
    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 watcom}
  {$define shortasmprefix}
{$endif}
{$ifdef tos}
  {$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,symsym,aasmbase;


    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;

      tmodule = class;
      tused_unit = class;

      tunitmaprec = record
        u : tmodule;
        unitsym : tunitsym;
      end;
      punitmap = ^tunitmaprec;

      tmodule = class(tmodulebase)
        do_reload,                { force reloading of the unit }
        do_compile,               { need to compile the sources }
        sources_avail,            { if all sources are reachable }
        interface_compiled,       { if the interface section has been parsed/compiled/loaded }
        is_stab_written,
        is_reset,
        is_unit,
        in_interface,             { processing the implementation part? }
        in_global     : boolean;  { allow global settings }
        mode_switch_allowed  : boolean;  { Whether a mode switch is still allowed at this point in the parsing.}
        mainfilepos   : tfileposinfo;
        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 }
        mapsize       : longint;  { number of units in the map }
        derefdataintflen : longint;
        derefdata     : tdynamicarray;
        globalsymtable,           { pointer to the global symtable of this unit }
        localsymtable : tsymtable;{ pointer to the local symtable of this unit }
        globalmacrosymtable,           { pointer to the global macro symtable of this unit }
        localmacrosymtable : tsymtable;{ pointer to the local macro symtable of this unit }
        scanner       : pointer;  { scanner object used }
        procinfo      : pointer;  { current procedure being compiled }
        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 }
        {create creates a new module which name is stored in 's'. LoadedFrom
        points to the module calling it. It is nil for the first compiled
        module. This allow inheritence of all path lists. MUST pay attention
        to that when creating link.res!!!!(mazen)}
        constructor create(LoadedFrom:TModule;const s:string;_is_unit:boolean);
        destructor destroy;override;
        procedure reset;virtual;
        procedure adddependency(callermodule:tmodule);
        procedure flagdependent(callermodule:tmodule);
        function  addusedunit(hp:tmodule;inuses:boolean;usym:tunitsym):tused_unit;
        procedure numberunits;
        procedure allunitsused;
        procedure setmodulename(const s:string);
      end;

       tused_unit = class(tlinkedlistitem)
          checksum,
          interface_checksum : cardinal;
          in_uses,
          in_interface    : boolean;
          u               : tmodule;
          unitsym         : tunitsym;
          constructor create(_u : tmodule;intface,inuses:boolean;usym:tunitsym);
       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
    {$IFDEF USE_SYSUTILS}
      SysUtils,
      GlobType,
    {$ELSE USE_SYSUTILS}
      dos,
    {$ENDIF USE_SYSUTILS}
      verbose,systems,
      scanner,
      procinfo;


{*****************************************************************************
                             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,inuses:boolean;usym:tunitsym);
      begin
        u:=_u;
        in_interface:=intface;
        in_uses:=inuses;
        unitsym:=usym;
        if _u.state=ms_compiled then
         begin
           checksum:=u.crc;
           interface_checksum:=u.interface_crc;
         end
        else
         begin
           checksum:=0;
           interface_checksum:=0;
         end;
      end;


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

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


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

    constructor tmodule.create(LoadedFrom:TModule;const s:string;_is_unit:boolean);
      var
        p : dirstr;
        n : namestr;
        e : extstr;
      begin
    {$IFDEF USE_SYSUTILS}
        p := SplitPath(s);
        n := SplitName(s);
        e := SplitExtension(s);
    {$ELSE USE_SYSUTILS}
        FSplit(s,p,n,e);
    {$ENDIF USE_SYSUTILS}
        { Programs have the name 'Program' to don't conflict with dup id's }
        if _is_unit then
         inherited create(n)
        else
         inherited create('Program');
        mainsource:=stringdup(s);
        { Dos has the famous 8.3 limit :( }
{$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;
        mapsize:=0;
        derefdata:=TDynamicArray.Create(1024);
        derefdataintflen:=0;
        globalsymtable:=nil;
        localsymtable:=nil;
        globalmacrosymtable:=nil;
        localmacrosymtable:=nil;
        loaded_from:=LoadedFrom;
        do_reload:=false;
        do_compile:=false;
        sources_avail:=true;
        mainfilepos.line:=0;
        mainfilepos.column:=0;
        mainfilepos.fileindex:=0;
        recompile_reason:=rr_unknown;
        in_interface:=true;
        in_global:=true;
        is_unit:=_is_unit;
        islibrary:=false;
        is_stab_written:=false;
        is_reset:=false;
        mode_switch_allowed:= true;
        uses_imports:=false;
        imports:=TLinkedList.Create;
        _exports:=TLinkedList.Create;
        externals:=TLinkedList.Create;
        librarydata:=tasmlibrarydata.create(realmodulename^);
      end;


    destructor tmodule.Destroy;
      var
{$ifdef MEMDEBUG}
        d : tmemdebug;
{$endif}
        hpi : tprocinfo;
      begin
        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;
        if assigned(procinfo) then
          begin
            if current_procinfo=tprocinfo(procinfo) then
             current_procinfo:=nil;
            { release procinfo tree }
            while assigned(procinfo) do
             begin
               hpi:=tprocinfo(procinfo).parent;
               tprocinfo(procinfo).free;
               procinfo:=hpi;
             end;
          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}
        derefdata.free;
        if assigned(globalsymtable) then
          globalsymtable.free;
        if assigned(localsymtable) then
          localsymtable.free;
        if assigned(globalmacrosymtable) then
          globalmacrosymtable.free;
        if assigned(localmacrosymtable) then
          localmacrosymtable.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
        hpi : tprocinfo;
      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(procinfo) then
          begin
            if current_procinfo=tprocinfo(procinfo) then
             current_procinfo:=nil;
            { release procinfo tree }
            while assigned(procinfo) do
             begin
               hpi:=tprocinfo(procinfo).parent;
               tprocinfo(procinfo).free;
               procinfo:=hpi;
             end;
          end;
        if assigned(globalsymtable) then
          begin
            globalsymtable.free;
            globalsymtable:=nil;
          end;
        if assigned(localsymtable) then
          begin
            localsymtable.free;
            localsymtable:=nil;
          end;
        if assigned(globalmacrosymtable) then
          begin
            globalmacrosymtable.free;
            globalmacrosymtable:=nil;
          end;
        if assigned(localmacrosymtable) then
          begin
            localmacrosymtable.free;
            localmacrosymtable:=nil;
          end;
        derefdata.free;
        derefdata:=TDynamicArray.Create(1024);
        if assigned(map) then
          begin
            freemem(map);
            map:=nil;
          end;
        derefdataintflen:=0;
        mapsize:=0;
        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;
        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;
        do_reload:=false;
        interface_compiled:=false;
        in_interface:=true;
        in_global:=true;
        mode_switch_allowed:=true;
        is_stab_written:=false;
        is_reset:=false;
        crc:=0;
        interface_crc:=0;
        flags:=0;
        mainfilepos.line:=0;
        mainfilepos.column:=0;
        mainfilepos.fileindex:=0;
        recompile_reason:=rr_unknown;
        {
          The following fields should not
          be reset:
           mainsource
           state
           loaded_from
           sources_avail
        }
      end;


    procedure tmodule.adddependency(callermodule:tmodule);
      begin
        { This is not needed for programs }
        if not callermodule.is_unit then
          exit;
        Message2(unit_u_add_depend_to,callermodule.modulename^,modulename^);
        dependent_units.concat(tdependent_unit.create(callermodule));
      end;


    procedure tmodule.flagdependent(callermodule:tmodule);
      var
        pm : tdependent_unit;
      begin
        { flag all units that depend on this unit for reloading }
        pm:=tdependent_unit(current_module.dependent_units.first);
        while assigned(pm) do
         begin
           { We do not have to reload the unit that wants to load
             this unit, unless this unit is already compiled during
             the loading }
           if (pm.u=callermodule) and
              (pm.u.state<>ms_compiled) then
             Message1(unit_u_no_reload_is_caller,pm.u.modulename^)
           else
            if pm.u.state=ms_second_compile then
              Message1(unit_u_no_reload_in_second_compile,pm.u.modulename^)
           else
            begin
              pm.u.do_reload:=true;
              Message1(unit_u_flag_for_reload,pm.u.modulename^);
            end;
           pm:=tdependent_unit(pm.next);
         end;
      end;


    function tmodule.addusedunit(hp:tmodule;inuses:boolean;usym:tunitsym):tused_unit;
      var
        pu : tused_unit;
      begin
        pu:=tused_unit.create(hp,in_interface,inuses,usym);
        used_units.concat(pu);
        addusedunit:=pu;
      end;


    procedure tmodule.numberunits;
      var
        pu : tused_unit;
        hp : tmodule;
        i  : integer;
      begin
        { Reset all numbers to -1 }
        hp:=tmodule(loaded_units.first);
        while assigned(hp) do
         begin
           if assigned(hp.globalsymtable) then
             hp.globalsymtable.unitid:=$ffff;
           hp:=tmodule(hp.next);
         end;
        { Allocate map }
        mapsize:=used_units.count+1;
        reallocmem(map,mapsize*sizeof(tunitmaprec));
        { Our own symtable gets unitid 0, for a program there is
          no globalsymtable }
        if assigned(globalsymtable) then
          globalsymtable.unitid:=0;
        map[0].u:=self;
        map[0].unitsym:=nil;
        { number units and map }
        i:=1;
        pu:=tused_unit(used_units.first);
        while assigned(pu) do
          begin
            if assigned(pu.u.globalsymtable) then
              begin
                tsymtable(pu.u.globalsymtable).unitid:=i;
                map[i].u:=pu.u;
                map[i].unitsym:=pu.unitsym;
                inc(i);
              end;
            pu:=tused_unit(pu.next);
          end;
      end;


    procedure tmodule.allunitsused;
      var
        i : longint;
      begin
        for i:=0 to mapsize-1 do
          begin
            if assigned(map[i].unitsym) and
               (map[i].unitsym.refs=0) then
              MessagePos2(map[i].unitsym.fileinfo,sym_n_unit_not_used,map[i].u.realmodulename^,realmodulename^);
          end;
      end;


    procedure tmodule.setmodulename(const s:string);
      begin
        stringdispose(modulename);
        stringdispose(realmodulename);
        modulename:=stringdup(upper(s));
        realmodulename:=stringdup(s);
        { also update asmlibrary names }
        librarydata.name:=modulename^;
        librarydata.realname:=realmodulename^;
      end;

end.
{
  $Log$
  Revision 1.51  2005-01-09 20:24:43  olle
    * rework of macro subsystem
    + exportable macros for mode macpas

  Revision 1.50  2004/12/28 20:43:01  hajny
    * 8.3 fixes (short target name in paths)

  Revision 1.49  2004/11/04 23:59:13  peter
  use filepos of main when generating the module stabs

  Revision 1.48  2004/10/14 18:16:17  mazen
  * USE_SYSUTILS merged successfully : cycles with and without defines
  * Need to be optimized in performance

  Revision 1.47  2004/10/14 17:30:09  mazen
  * use SysUtils unit instead of Dos Unit

  Revision 1.46  2004/08/30 20:23:33  peter
    * use realmodulename in unit not used msg

  Revision 1.45  2004/06/20 08:55:29  florian
    * logs truncated

  Revision 1.44  2004/03/08 22:07:46  peter
    * stabs updates to write stabs for def for all implictly used
      units

}