freepascal.compiler/compiler/pmodules.pas

{
    Copyright (c) 1998-2008 by Florian Klaempfl

    Handles the parsing and loading of the modules (ppufiles)

    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 pmodules;

{$i fpcdefs.inc}

interface

    function proc_unit:boolean;
    procedure proc_package;
    procedure proc_program(islibrary : boolean);

implementation

    uses
       SysUtils,
       globtype,version,systems,tokens,
       cutils,cfileutl,cclasses,comphook,
       globals,verbose,fmodule,finput,fppu,globstat,fpcp,fpkg,
       symconst,symbase,symtype,symdef,symsym,symtable,symcreat,
       wpoinfo,
       aasmtai,aasmdata,aasmcpu,aasmbase,
       cgbase,cgobj,ngenutil,
       nbas,nutils,ncgutil,
       link,assemble,import,export,gendef,entfile,ppu,comprsrc,dbgbase,
       cresstr,procinfo,
       pexports,
       objcgutl,
       pkgutil,
       wpobase,
       scanner,pbase,pexpr,psystem,psub,pdecsub,pgenutil,ncgvmt,ncgrtti,
       cpuinfo;


    procedure create_objectfile;
      var
        DLLScanner      : TDLLScanner;
        s               : string;
        KeepShared      : TCmdStrList;
      begin
        { try to create import entries from system dlls }
        if (tf_has_dllscanner in target_info.flags) and
           (not current_module.linkOtherSharedLibs.Empty) then
         begin
           { Init DLLScanner }
           if assigned(CDLLScanner[target_info.system]) then
            DLLScanner:=CDLLScanner[target_info.system].Create
           else
            internalerror(200104121);
           KeepShared:=TCmdStrList.Create;
           { Walk all shared libs }
           While not current_module.linkOtherSharedLibs.Empty do
            begin
              S:=current_module.linkOtherSharedLibs.Getusemask(link_always);
              if not DLLScanner.scan(s) then
               KeepShared.Concat(s);
            end;
           DLLscanner.Free;
           { Recreate import section }
           if (target_info.system in [system_i386_win32,system_i386_wdosx]) then
            begin
              if assigned(current_asmdata.asmlists[al_imports]) then
               current_asmdata.asmlists[al_imports].clear
              else
               current_asmdata.asmlists[al_imports]:=TAsmList.Create;
              importlib.generatelib;
            end;
           { Readd the not processed files }
           while not KeepShared.Empty do
            begin
              s:=KeepShared.GetFirst;
              current_module.linkOtherSharedLibs.add(s,link_always);
            end;
           KeepShared.Free;
         end;

        { allow a target-specific pass over all assembler code (used by LLVM
          to insert type definitions }
        cnodeutils.InsertObjectInfo;

        { Start and end module debuginfo, at least required for stabs
          to insert n_sourcefile lines }
        if (cs_debuginfo in current_settings.moduleswitches) or
           (cs_use_lineinfo in current_settings.globalswitches) then
          current_debuginfo.insertmoduleinfo;

        { create the .s file and assemble it }
        if not(create_smartlink_library) or not(tf_no_objectfiles_when_smartlinking in target_info.flags) then
          GenerateAsm(false);

        { Also create a smartlinked version ? }
        if create_smartlink_library then
         begin
           GenerateAsm(true);
           if (af_needar in target_asm.flags) then
             Linker.MakeStaticLibrary;
         end;

        { resource files }
        CompileResourceFiles;
      end;


    procedure insertobjectfile;
    { Insert the used object file for this unit in the used list for this unit }
      begin
        current_module.linkunitofiles.add(current_module.objfilename,link_static);
        current_module.flags:=current_module.flags or uf_static_linked;

        if create_smartlink_library then
         begin
           current_module.linkunitstaticlibs.add(current_module.staticlibfilename ,link_smart);
           current_module.flags:=current_module.flags or uf_smart_linked;
         end;
      end;


    procedure create_dwarf_frame;
      begin
        { Dwarf conflicts with smartlinking in separate .a files }
        if create_smartlink_library then
          exit;
        { Call frame information }
        { MWE: we write our own info, so dwarf asm support is not really needed }
        { if (af_supports_dwarf in target_asm.flags) and }
        { CFI is currently broken for Darwin }
        if not(target_info.system in systems_darwin) and
           (
            (tf_needs_dwarf_cfi in target_info.flags) or
            (target_dbg.id in [dbg_dwarf2, dbg_dwarf3])
           ) then
          begin
            current_asmdata.asmlists[al_dwarf_frame].Free;
            current_asmdata.asmlists[al_dwarf_frame] := TAsmList.create;
            current_asmdata.asmcfi.generate_code(current_asmdata.asmlists[al_dwarf_frame]);
          end;
      end;

    Function CheckResourcesUsed : boolean;
      var
        hp           : tused_unit;
        found        : Boolean;
      begin
        CheckResourcesUsed:=tf_has_winlike_resources in target_info.flags;
        if not CheckResourcesUsed then exit;

        hp:=tused_unit(usedunits.first);
        found:=((current_module.flags and uf_has_resourcefiles)=uf_has_resourcefiles);
        If not found then
          While Assigned(hp) and not found do
            begin
            Found:=((hp.u.flags and uf_has_resourcefiles)=uf_has_resourcefiles);
            hp:=tused_unit(hp.next);
            end;
        CheckResourcesUsed:=found;
      end;

    function AddUnit(const s:string;addasused:boolean): tppumodule;
      var
        hp : tppumodule;
        unitsym : tunitsym;
      begin
        { load unit }
        hp:=registerunit(current_module,s,'');
        hp.loadppu;
        hp.adddependency(current_module);
        { add to symtable stack }
        symtablestack.push(hp.globalsymtable);
        if (m_mac in current_settings.modeswitches) and
           assigned(hp.globalmacrosymtable) then
          macrosymtablestack.push(hp.globalmacrosymtable);
        { insert unitsym }
        unitsym:=cunitsym.create(s,hp);
        inc(unitsym.refs);
        tabstractunitsymtable(current_module.localsymtable).insertunit(unitsym);
        if addasused then
          { add to used units }
          current_module.addusedunit(hp,false,unitsym);
        result:=hp;
      end;


    function AddUnit(const s:string):tppumodule;
      begin
        result:=AddUnit(s,true);
      end;


    procedure maybeloadvariantsunit;
      var
        hp : tmodule;
      begin
        { Do we need the variants unit? Skip this
          for VarUtils unit for bootstrapping }
        if (current_module.flags and uf_uses_variants=0) or
           (current_module.modulename^='VARUTILS') then
          exit;
        { Variants unit already loaded? }
        hp:=tmodule(loaded_units.first);
        while assigned(hp) do
          begin
            if hp.modulename^='VARIANTS' then
              exit;
            hp:=tmodule(hp.next);
          end;
        { Variants unit is not loaded yet, load it now }
        Message(parser_w_implicit_uses_of_variants_unit);
        AddUnit('variants');
      end;


    function MaybeRemoveResUnit : boolean;
      var
        resources_used : boolean;
        hp : tmodule;
        uu : tused_unit;
        unitname : shortstring;
      begin
        { We simply remove the unit from:
           - usedunit list, so that things like init/finalization table won't
              contain references to this unit
           - loaded_units list, so that the unit object file doesn't get linked
             with the executable. }
        { Note: on windows we always need resources! }
        resources_used:=(target_info.system in systems_all_windows)
                         or CheckResourcesUsed;
        if (not resources_used) and (tf_has_winlike_resources in target_info.flags) then
          begin
            { resources aren't used, so we don't need this unit }
            if target_res.id=res_ext then
              unitname:='FPEXTRES'
            else
              unitname:='FPINTRES';
            Message1(unit_u_unload_resunit,unitname);
            { find the module }
            hp:=tmodule(loaded_units.first);
            while assigned(hp) do
              begin
                if hp.is_unit and (hp.modulename^=unitname) then break;
                hp:=tmodule(hp.next);
              end;
            if not assigned(hp) then
              internalerror(200801071);
            { find its tused_unit in the global list }
            uu:=tused_unit(usedunits.first);
            while assigned(uu) do
              begin
                if uu.u=hp then break;
                uu:=tused_unit(uu.next);
              end;
            if not assigned(uu) then
              internalerror(200801072);
           { remove the tused_unit }
            usedunits.Remove(uu);
            uu.Free;
           { remove the module }
            loaded_units.Remove(hp);
            unloaded_units.Concat(hp);
          end;
        MaybeRemoveResUnit:=resources_used;
      end;


    procedure loaddefaultunits;
      begin
        { we are going to rebuild the symtablestack, clear it first }
        symtablestack.clear;
        macrosymtablestack.clear;

        { macro symtable }
        macrosymtablestack.push(initialmacrosymtable);

        { are we compiling the system unit? }
        if (cs_compilesystem in current_settings.moduleswitches) then
         begin
           systemunit:=tglobalsymtable(current_module.localsymtable);
           { create system defines }
           create_intern_types;
           create_intern_symbols;
           { Set the owner of errorsym and errortype to symtable to
             prevent crashes when accessing .owner }
           generrorsym.owner:=systemunit;
           generrordef.owner:=systemunit;
           exit;
         end;

        { insert the system unit, it is allways the first. Load also the
          internal types from the system unit }
        AddUnit('system');
        systemunit:=tglobalsymtable(symtablestack.top);
        load_intern_types;

        { Set the owner of errorsym and errortype to symtable to
          prevent crashes when accessing .owner }
        generrorsym.owner:=systemunit;
        generrordef.owner:=systemunit;

        { Units only required for main module }
        if not(current_module.is_unit) then
         begin
           { Heaptrc unit, load heaptrace before any other units especially objpas }
           if (cs_use_heaptrc in current_settings.globalswitches) then
             AddUnit('heaptrc');
           { Lineinfo unit }
           if (cs_use_lineinfo in current_settings.globalswitches) then begin
             case target_dbg.id of
               dbg_stabs:
                 AddUnit('lineinfo');
               dbg_stabx:
                 AddUnit('lnfogdb');
               else
                 AddUnit('lnfodwrf');
             end;
           end;
           { Valgrind requires c memory manager }
           if (cs_gdb_valgrind in current_settings.globalswitches) then
             AddUnit('cmem');
{$ifdef cpufpemu}
           { Floating point emulation unit?
             softfpu must be in the system unit anyways (FK)
           if (cs_fp_emulation in current_settings.moduleswitches) and not(target_info.system in system_wince) then
             AddUnit('softfpu');
           }
{$endif cpufpemu}
           { Which kind of resource support?
             Note: if resources aren't used this unit will be removed later,
             otherwise we need it here since it must be loaded quite early }
           if (tf_has_winlike_resources in target_info.flags) then
             if target_res.id=res_ext then
               AddUnit('fpextres')
             else
               AddUnit('fpintres');
         end
        else if (cs_checkpointer in current_settings.localswitches) then
          AddUnit('heaptrc');
        { Objpas unit? }
        if m_objpas in current_settings.modeswitches then
          AddUnit('objpas');

        { Macpas unit? }
        if m_mac in current_settings.modeswitches then
          AddUnit('macpas');

        if m_iso in current_settings.modeswitches then
          AddUnit('iso7185');

        if m_extpas in current_settings.modeswitches then
          begin
            { basic procedures for Extended Pascal are for now provided by the iso unit }
            AddUnit('iso7185');
            AddUnit('extpas');
          end;

        { blocks support? }
        if m_blocks in current_settings.modeswitches then
          AddUnit('blockrtl');

        { default char=widechar? }
        if m_default_unicodestring in current_settings.modeswitches then
          AddUnit('uuchar');

        { Objective-C support unit? }
        if (m_objectivec1 in current_settings.modeswitches) then
          begin
            { interface to Objective-C run time }
            AddUnit('objc');
            loadobjctypes;
            { NSObject }
            if not(current_module.is_unit) or
               (current_module.modulename^<>'OBJCBASE') then
              AddUnit('objcbase');
          end;
        { Profile unit? Needed for go32v2 only }
        if (cs_profile in current_settings.moduleswitches) and
           (target_info.system in [system_i386_go32v2,system_i386_watcom]) then
          AddUnit('profile');
        if (cs_load_fpcylix_unit in current_settings.globalswitches) then
          begin
            AddUnit('fpcylix');
            AddUnit('dynlibs');
          end;

        { CPU targets with microcontroller support can add a controller specific unit }
        if ControllerSupport and (target_info.system in systems_embedded) and
          (current_settings.controllertype<>ct_none) and
          (embedded_controllers[current_settings.controllertype].controllerunitstr<>'') then
          AddUnit(embedded_controllers[current_settings.controllertype].controllerunitstr);
      end;


    procedure loadautounits;
      var
        hs,s : string;
      begin
        hs:=autoloadunits;
        repeat
          s:=GetToken(hs,',');
          if s='' then
            break;
          AddUnit(s);
        until false;
      end;


    procedure loadunits(preservest:tsymtable);
      var
         s,sorg  : ansistring;
         fn      : string;
         pu      : tused_unit;
         hp2     : tmodule;
         unitsym : tunitsym;
         filepos : tfileposinfo;
      begin
         consume(_USES);
         repeat
           s:=pattern;
           sorg:=orgpattern;
           filepos:=current_tokenpos;
           consume(_ID);
           while token=_POINT do
             begin
               consume(_POINT);
               s:=s+'.'+pattern;
               sorg:=sorg+'.'+orgpattern;
               consume(_ID);
             end;
           { support "<unit> in '<file>'" construct, but not for tp7 }
           fn:='';
           if not(m_tp7 in current_settings.modeswitches) and
              try_to_consume(_OP_IN) then
             fn:=FixFileName(get_stringconst);
           { Give a warning if lineinfo is loaded }
           if s='LINEINFO' then
             begin
               Message(parser_w_no_lineinfo_use_switch);
               if (target_dbg.id in [dbg_dwarf2, dbg_dwarf3]) then
                s := 'LNFODWRF';
              sorg := s;
             end;
           { Give a warning if objpas is loaded }
           if s='OBJPAS' then
            Message(parser_w_no_objpas_use_mode);
           { Using the unit itself is not possible }
           if (s<>current_module.modulename^) then
            begin
              { check if the unit is already used }
              hp2:=nil;
              pu:=tused_unit(current_module.used_units.first);
              while assigned(pu) do
               begin
                 if (pu.u.modulename^=s) then
                  begin
                    hp2:=pu.u;
                    break;
                  end;
                 pu:=tused_unit(pu.next);
               end;
              if not assigned(hp2) then
                hp2:=registerunit(current_module,sorg,fn)
              else
                Message1(sym_e_duplicate_id,s);
              { Create unitsym, we need to use the name as specified, we
                can not use the modulename because that can be different
                when -Un is used }
              current_tokenpos:=filepos;
              unitsym:=cunitsym.create(sorg,nil);
              tabstractunitsymtable(current_module.localsymtable).insertunit(unitsym);
              { the current module uses the unit hp2 }
              current_module.addusedunit(hp2,true,unitsym);
            end
           else
            Message1(sym_e_duplicate_id,s);
           if token=_COMMA then
            begin
              pattern:='';
              consume(_COMMA);
            end
           else
            break;
         until false;

         { Load the units }
         pu:=tused_unit(current_module.used_units.first);
         while assigned(pu) do
          begin
            { Only load the units that are in the current
              (interface/implementation) uses clause }
            if pu.in_uses and
               (pu.in_interface=current_module.in_interface) then
             begin
               tppumodule(pu.u).loadppu;
               { is our module compiled? then we can stop }
               if current_module.state=ms_compiled then
                 exit;
               { add this unit to the dependencies }
               pu.u.adddependency(current_module);
               { save crc values }
               pu.checksum:=pu.u.crc;
               pu.interface_checksum:=pu.u.interface_crc;
               pu.indirect_checksum:=pu.u.indirect_crc;
               { connect unitsym to the module }
               pu.unitsym.module:=pu.u;
               { add to symtable stack }
               if assigned(preservest) then
                 symtablestack.pushafter(pu.u.globalsymtable,preservest)
               else
                 symtablestack.push(pu.u.globalsymtable);
               if (m_mac in current_settings.modeswitches) and
                  assigned(pu.u.globalmacrosymtable) then
                 macrosymtablestack.push(pu.u.globalmacrosymtable);
               { check hints }
               pu.check_hints;
             end;
            pu:=tused_unit(pu.next);
          end;
      end;


     procedure reset_all_defs;
       begin
         if assigned(current_module.wpoinfo) then
           current_module.wpoinfo.resetdefs;
       end;


    procedure free_localsymtables(st:TSymtable);
      var
        i   : longint;
        def : tstoreddef;
        pd  : tprocdef;
      begin
        for i:=0 to st.DefList.Count-1 do
          begin
            def:=tstoreddef(st.DefList[i]);
            if def.typ=procdef then
              begin
                pd:=tprocdef(def);
                if assigned(pd.localst) and
                   (pd.localst.symtabletype<>staticsymtable) and
                   not(po_inline in pd.procoptions) then
                  begin
                    free_localsymtables(pd.localst);
                    pd.localst.free;
                    pd.localst:=nil;
                  end;
                pd.freeimplprocdefinfo;
                pd.done_paraloc_info(calleeside);
              end;
          end;
      end;


    procedure free_unregistered_localsymtable_elements;
      var
        i: longint;
        def: tdef;
        sym: tsym;
      begin
        { from high to low so we hopefully have moves of less data }
        for i:=current_module.localsymtable.symlist.count-1 downto 0 do
          begin
            sym:=tsym(current_module.localsymtable.symlist[i]);
            { this also frees sym, as the symbols are owned by the symtable }
            if not sym.is_registered then
              current_module.localsymtable.Delete(sym);
          end;
        for i:=current_module.localsymtable.deflist.count-1 downto 0 do
          begin
            def:=tdef(current_module.localsymtable.deflist[i]);
            { this also frees def, as the defs are owned by the symtable }
            if not def.is_registered and
               not(df_not_registered_no_free in def.defoptions) then
              current_module.localsymtable.deletedef(def);
          end;
      end;


    procedure setupglobalswitches;
      begin
        if (cs_create_pic in current_settings.moduleswitches) then
          begin
            def_system_macro('FPC_PIC');
            def_system_macro('PIC');
          end;
      end;


    function create_main_proc(const name:string;potype:tproctypeoption;st:TSymtable):tcgprocinfo;
      var
        ps  : tprocsym;
        pd  : tprocdef;
      begin
        { there should be no current_procinfo available }
        if assigned(current_procinfo) then
         internalerror(200304275);
        {Generate a procsym for main}
        ps:=cprocsym.create('$'+name);
        { always register the symbol }
        ps.register_sym;
        { main are allways used }
        inc(ps.refs);
        st.insert(ps);
        pd:=tprocdef(cnodeutils.create_main_procdef(target_info.cprefix+name,potype,ps));
        { We don't need is a local symtable. Change it into the static
          symtable }
        if potype<>potype_mainstub then
          begin
            pd.localst.free;
            pd.localst:=st;
          end
        else
          pd.proccalloption:=pocall_cdecl;
        handle_calling_convention(pd);
        { set procinfo and current_procinfo.procdef }
        result:=tcgprocinfo(cprocinfo.create(nil));
        result.procdef:=pd;
        { main proc does always a call e.g. to init system unit }
        include(result.flags,pi_do_call);
      end;


    procedure release_main_proc(pi:tcgprocinfo);
      begin
        { remove localst as it was replaced by staticsymtable }
        pi.procdef.localst:=nil;
        { remove procinfo }
        current_module.procinfo:=nil;
        pi.free;
        pi:=nil;
      end;



    { Insert _GLOBAL_OFFSET_TABLE_ symbol if system uses it }

    procedure maybe_load_got;
{$if defined(i386) or defined (sparc)}
       var
         gotvarsym : tstaticvarsym;
{$endif i386 or sparc}
      begin
{$if defined(i386) or defined(sparc)}
         if (cs_create_pic in current_settings.moduleswitches) and
            (tf_pic_uses_got in target_info.flags) then
           begin
             { insert symbol for got access in assembler code}
             gotvarsym:=cstaticvarsym.create('_GLOBAL_OFFSET_TABLE_',
                          vs_value,voidpointertype,[vo_is_external],true);
             gotvarsym.set_mangledname('_GLOBAL_OFFSET_TABLE_');
             current_module.localsymtable.insert(gotvarsym);
             { avoid unnecessary warnings }
             gotvarsym.varstate:=vs_read;
             gotvarsym.refs:=1;
           end;
{$endif i386 or sparc}
      end;

    function gen_implicit_initfinal(flag:word;st:TSymtable):tcgprocinfo;
      begin
        { create procdef }
        case flag of
          uf_init :
            begin
              result:=create_main_proc(make_mangledname('',current_module.localsymtable,'init_implicit'),potype_unitinit,st);
              result.procdef.aliasnames.insert(make_mangledname('INIT$',current_module.localsymtable,''));
            end;
          uf_finalize :
            begin
              result:=create_main_proc(make_mangledname('',current_module.localsymtable,'finalize_implicit'),potype_unitfinalize,st);
              result.procdef.aliasnames.insert(make_mangledname('FINALIZE$',current_module.localsymtable,''));
              if (not current_module.is_unit) then
                result.procdef.aliasnames.insert('PASCALFINALIZE');
            end;
          else
            internalerror(200304253);
        end;
        result.code:=cnothingnode.create;
      end;


    procedure copy_macro(p:TObject; arg:pointer);
      begin
        current_module.globalmacrosymtable.insert(tmacro(p).getcopy);
      end;

    function try_consume_hintdirective(var moduleopt:tmoduleoptions; var deprecatedmsg:pshortstring):boolean;
      var
        deprecated_seen,
        last_is_deprecated:boolean;
      begin
        try_consume_hintdirective:=false;
        deprecated_seen:=false;
        repeat
          last_is_deprecated:=false;
          case idtoken of
            _LIBRARY :
              begin
                include(moduleopt,mo_hint_library);
                try_consume_hintdirective:=true;
              end;
            _DEPRECATED :
              begin
                { allow deprecated only once }
                if deprecated_seen then
                  break;
                include(moduleopt,mo_hint_deprecated);
                try_consume_hintdirective:=true;
                last_is_deprecated:=true;
                deprecated_seen:=true;
              end;
            _EXPERIMENTAL :
              begin
                include(moduleopt,mo_hint_experimental);
                try_consume_hintdirective:=true;
              end;
            _PLATFORM :
              begin
                include(moduleopt,mo_hint_platform);
                try_consume_hintdirective:=true;
              end;
            _UNIMPLEMENTED :
              begin
                include(moduleopt,mo_hint_unimplemented);
                try_consume_hintdirective:=true;
              end;
            else
              break;
          end;
          consume(Token);
          { handle deprecated message }
          if ((token=_CSTRING) or (token=_CCHAR)) and last_is_deprecated then
            begin
              if deprecatedmsg<>nil then
                internalerror(201001221);
              if token=_CSTRING then
                deprecatedmsg:=stringdup(cstringpattern)
              else
                deprecatedmsg:=stringdup(pattern);
              consume(token);
              include(moduleopt,mo_has_deprecated_msg);
            end;
        until false;
      end;


{$ifdef jvm}
      procedure addmoduleclass;
        var
          def: tobjectdef;
          typesym: ttypesym;
        begin
          { java_jlobject may not have been parsed yet (system unit); in any
            case, we only use this to refer to the class type, so inheritance
            does not matter }
          def:=cobjectdef.create(odt_javaclass,'__FPC_JVM_Module_Class_Alias$',nil,true);
          include(def.objectoptions,oo_is_external);
          include(def.objectoptions,oo_is_sealed);
          def.objextname:=stringdup(current_module.realmodulename^);
          typesym:=ctypesym.create('__FPC_JVM_Module_Class_Alias$',def,true);
          symtablestack.top.insert(typesym);
        end;
{$endif jvm}

type
    tfinishstate=record
      init_procinfo:tcgprocinfo;
    end;
    pfinishstate=^tfinishstate;

    procedure finish_unit(module:tmodule;immediate:boolean);forward;

    function proc_unit:boolean;
      var
         main_file: tinputfile;
         s1,s2  : ^string; {Saves stack space}
         init_procinfo : tcgprocinfo;
         unitname : ansistring;
         unitname8 : string[8];
         i,j : longint;
         finishstate:pfinishstate;
         globalstate:pglobalstate;
         consume_semicolon_after_uses:boolean;
      begin
         result:=true;

         init_procinfo:=nil;

         if m_mac in current_settings.modeswitches then
           current_module.mode_switch_allowed:= false;

         consume(_UNIT);
         if compile_level=1 then
          Status.IsExe:=false;

         unitname:=orgpattern;
         consume(_ID);
         while token=_POINT do
           begin
             consume(_POINT);
             unitname:=unitname+'.'+orgpattern;
             consume(_ID);
           end;

         { create filenames and unit name }
         main_file := current_scanner.inputfile;
         while assigned(main_file.next) do
           main_file := main_file.next;

         new(s1);
         s1^:=current_module.modulename^;
         current_module.SetFileName(main_file.path+main_file.name,true);
         current_module.SetModuleName(unitname);

         { check for system unit }
         new(s2);
         s2^:=upper(ChangeFileExt(ExtractFileName(main_file.name),''));
         unitname8:=copy(current_module.modulename^,1,8);
         if (cs_check_unit_name in current_settings.globalswitches) and
            (
             not(
                 (current_module.modulename^=s2^) or
                 (
                  (length(current_module.modulename^)>8) and
                  (unitname8=s2^)
                 )
                )
             or
             (
              (length(s1^)>8) and
              (s1^<>current_module.modulename^)
             )
            ) then
          Message1(unit_e_illegal_unit_name,current_module.realmodulename^);
         if (current_module.modulename^='SYSTEM') then
          include(current_settings.moduleswitches,cs_compilesystem);
         dispose(s2);
         dispose(s1);

         if (target_info.system in systems_unit_program_exports) then
           exportlib.preparelib(current_module.realmodulename^);

         { parse hint directives }
         try_consume_hintdirective(current_module.moduleoptions, current_module.deprecatedmsg);

         consume(_SEMICOLON);

         { handle the global switches, do this before interface, because after interface has been
           read, all following directives are parsed as well }
         setupglobalswitches;

         consume(_INTERFACE);

         { global switches are read, so further changes aren't allowed  }
         current_module.in_global:=false;

         message1(unit_u_loading_interface_units,current_module.modulename^);

         { update status }
         status.currentmodule:=current_module.realmodulename^;

         { maybe turn off m_objpas if we are compiling objpas }
         if (current_module.modulename^='OBJPAS') then
           exclude(current_settings.modeswitches,m_objpas);

         { maybe turn off m_mac if we are compiling macpas }
         if (current_module.modulename^='MACPAS') then
           exclude(current_settings.modeswitches,m_mac);

         parse_only:=true;

         { generate now the global symboltable,
           define first as local to overcome dependency conflicts }
         current_module.localsymtable:=tglobalsymtable.create(current_module.modulename^,current_module.moduleid);

         { insert unitsym of this unit to prevent other units having
           the same name }
         tabstractunitsymtable(current_module.localsymtable).insertunit(cunitsym.create(current_module.realmodulename^,current_module));

         { load default units, like the system unit }
         loaddefaultunits;

         { insert qualifier for the system unit (allows system.writeln) }
         if not(cs_compilesystem in current_settings.moduleswitches) and
            (token=_USES) then
           begin
             loadunits(nil);
             { has it been compiled at a higher level ?}
             if current_module.state=ms_compiled then
               begin
                 Message1(parser_u_already_compiled,current_module.realmodulename^);
                 exit;
               end;

             consume_semicolon_after_uses:=true;
           end
         else
           consume_semicolon_after_uses:=false;

         { move the global symtable from the temporary local to global }
         current_module.globalsymtable:=current_module.localsymtable;
         current_module.localsymtable:=nil;

         { number all units, so we know if a unit is used by this unit or
           needs to be added implicitly }
         current_module.updatemaps;

         { consume the semicolon after maps have been updated else conditional compiling expressions
           might cause internal errors, see tw8611 }
         if consume_semicolon_after_uses then
           consume(_SEMICOLON);

         { create whole program optimisation information (may already be
           updated in the interface, e.g., in case of classrefdef typed
           constants }
         current_module.wpoinfo:=tunitwpoinfo.create;

         { ... parse the declarations }
         Message1(parser_u_parsing_interface,current_module.realmodulename^);
         symtablestack.push(current_module.globalsymtable);
{$ifdef jvm}
         { fake classdef to represent the class corresponding to the unit }
         addmoduleclass;
{$endif}
         read_interface_declarations;

         { Export macros defined in the interface for macpas. The macros
           are put in the globalmacrosymtable that will only be used by other
           units. The current unit continues to use the localmacrosymtable }
         if (m_mac in current_settings.modeswitches) then
          begin
            current_module.globalmacrosymtable:=tmacrosymtable.create(true);
            current_module.localmacrosymtable.SymList.ForEachCall(@copy_macro,nil);
          end;

         { leave when we got an error }
         if (Errorcount>0) and not status.skip_error then
          begin
            Message1(unit_f_errors_in_unit,tostr(Errorcount));
            status.skip_error:=true;
            symtablestack.pop(current_module.globalsymtable);
            exit;
          end;

         { Our interface is compiled, generate CRC and switch to implementation }
         if not(cs_compilesystem in current_settings.moduleswitches) and
            (Errorcount=0) then
           tppumodule(current_module).getppucrc;
         current_module.in_interface:=false;
         current_module.interface_compiled:=true;

         { First reload all units depending on our interface, we need to do this
           in the implementation part to prevent erroneous circular references }
         tppumodule(current_module).setdefgeneration;
         tppumodule(current_module).reload_flagged_units;

         { Parse the implementation section }
         if (m_mac in current_settings.modeswitches) and try_to_consume(_END) then
           current_module.interface_only:=true
         else
           current_module.interface_only:=false;

         parse_only:=false;

         { create static symbol table }
         current_module.localsymtable:=tstaticsymtable.create(current_module.modulename^,current_module.moduleid);

         { Insert _GLOBAL_OFFSET_TABLE_ symbol if system uses it }
         maybe_load_got;

         if not current_module.interface_only then
           begin
             consume(_IMPLEMENTATION);
             Message1(unit_u_loading_implementation_units,current_module.modulename^);
             { Read the implementation units }
             if token=_USES then
               begin
                 loadunits(current_module.globalsymtable);
                 consume(_SEMICOLON);
               end;
           end;

         if current_module.state=ms_compiled then
           begin
             symtablestack.pop(current_module.globalsymtable);
             exit;
           end;

         { All units are read, now give them a number }
         current_module.updatemaps;

         { further, changing the globalsymtable is not allowed anymore }
         current_module.globalsymtable.sealed:=true;
         symtablestack.push(current_module.localsymtable);

         if not current_module.interface_only then
           begin
             Message1(parser_u_parsing_implementation,current_module.modulename^);
             if current_module.in_interface then
               internalerror(200212285);

             { Compile the unit }
             init_procinfo:=create_main_proc(make_mangledname('',current_module.localsymtable,'init'),potype_unitinit,current_module.localsymtable);
             init_procinfo.procdef.aliasnames.insert(make_mangledname('INIT$',current_module.localsymtable,''));
             init_procinfo.parse_body;
             { save file pos for debuginfo }
             current_module.mainfilepos:=init_procinfo.entrypos;
           end;

         { remove all units that we are waiting for that are already waiting for
           us => breaking up circles }
         for i:=0 to current_module.waitingunits.count-1 do
           for j:=current_module.waitingforunit.count-1 downto 0 do
             if current_module.waitingunits[i]=current_module.waitingforunit[j] then
               current_module.waitingforunit.delete(j);

{$ifdef DEBUG_UNITWAITING}
         Writeln('Units waiting for ', current_module.modulename^, ': ',
           current_module.waitingforunit.Count);
{$endif}
         result:=current_module.waitingforunit.count=0;

         { save all information that is needed for finishing the unit }
         New(finishstate);
         finishstate^.init_procinfo:=init_procinfo;
         current_module.finishstate:=finishstate;

         if result then
           finish_unit(current_module,true)
         else
           begin
             { save the current state, so the parsing can continue where we left
               of here }
             New(globalstate);
             save_global_state(globalstate^,true);
             current_module.globalstate:=globalstate;
           end;
      end;

    procedure finish_unit(module:tmodule;immediate:boolean);

      function is_assembler_generated:boolean;
      var
        hal : tasmlisttype;
      begin
        result:=false;
        if Errorcount=0 then
          begin
            for hal:=low(TasmlistType) to high(TasmlistType) do
              if not current_asmdata.asmlists[hal].empty then
                begin
                  result:=true;
                  exit;
                end;
          end;
      end;

      procedure module_is_done;inline;
        begin
          dispose(pglobalstate(current_module.globalstate));
          current_module.globalstate:=nil;
          dispose(pfinishstate(current_module.finishstate));
          current_module.finishstate:=nil;
        end;

      var
{$ifdef EXTDEBUG}
        store_crc,
{$endif EXTDEBUG}
        store_interface_crc,
        store_indirect_crc: cardinal;
        force_init_final : boolean;
        init_procinfo,
        finalize_procinfo : tcgprocinfo;
        i : longint;
        ag : boolean;
        finishstate : tfinishstate;
        globalstate : tglobalstate;
        waitingmodule : tmodule;
      begin
         fillchar(globalstate,sizeof(tglobalstate),0);
         if not immediate then
           begin
{$ifdef DEBUG_UNITWAITING}
             writeln('finishing waiting unit ''', module.modulename^, '''');
{$endif DEBUG_UNITWAITING}
             { restore the state when we stopped working on the unit }
             save_global_state(globalstate,true);
             if not assigned(module.globalstate) then
               internalerror(2012091802);
             restore_global_state(pglobalstate(module.globalstate)^,true);
           end;

         { current_module is now module }

         if not assigned(current_module.finishstate) then
           internalerror(2012091801);
         finishstate:=pfinishstate(current_module.finishstate)^;

         finalize_procinfo:=nil;

         init_procinfo:=finishstate.init_procinfo;

         { Generate specializations of objectdefs methods }
         generate_specialization_procs;

         { Generate VMTs }
         if Errorcount=0 then
           begin
             write_vmts(current_module.globalsymtable,true);
             write_vmts(current_module.localsymtable,false);
           end;

         { add implementations for synthetic method declarations added by
           the compiler }
         add_synthetic_method_implementations(current_module.globalsymtable);
         add_synthetic_method_implementations(current_module.localsymtable);

         { if the unit contains ansi/widestrings, initialization and
           finalization code must be forced }
         force_init_final:=tglobalsymtable(current_module.globalsymtable).needs_init_final or
                           tstaticsymtable(current_module.localsymtable).needs_init_final;

         { should we force unit initialization? }
         { this is a hack, but how can it be done better ? }
         { Now the sole purpose of this is to change 'init' to 'init_implicit',
           is it needed at all? (Sergei) }
         { it's needed in case cnodeutils.force_init = true }
         if (force_init_final or cnodeutils.force_init) and
            assigned(init_procinfo) and
            has_no_code(init_procinfo.code) then
           begin
             { first release the not used init procinfo }
             if assigned(init_procinfo) then
               begin
                 release_proc_symbol(init_procinfo.procdef);
                 release_main_proc(init_procinfo);
               end;
             init_procinfo:=gen_implicit_initfinal(uf_init,current_module.localsymtable);
           end;
         { finalize? }
         if not current_module.interface_only and (token=_FINALIZATION) then
           begin
              { Compile the finalize }
              finalize_procinfo:=create_main_proc(make_mangledname('',current_module.localsymtable,'finalize'),potype_unitfinalize,current_module.localsymtable);
              finalize_procinfo.procdef.aliasnames.insert(make_mangledname('FINALIZE$',current_module.localsymtable,''));
              finalize_procinfo.parse_body;
           end
         else if force_init_final or cnodeutils.force_final then
           finalize_procinfo:=gen_implicit_initfinal(uf_finalize,current_module.localsymtable);

         { Now both init and finalize bodies are read and it is known
           which variables are used in both init and finalize we can now
           generate the code. This is required to prevent putting a variable in
           a register that is also used in the finalize body (PFV) }
         if assigned(init_procinfo) then
           begin
             if (force_init_final or cnodeutils.force_init) or
                not(has_no_code(init_procinfo.code)) then
               begin
                 init_procinfo.code:=cnodeutils.wrap_proc_body(init_procinfo.procdef,init_procinfo.code);
                 init_procinfo.generate_code;
                 current_module.flags:=current_module.flags or uf_init;
               end
             else
               release_proc_symbol(init_procinfo.procdef);
             init_procinfo.resetprocdef;
             release_main_proc(init_procinfo);
           end;
         if assigned(finalize_procinfo) then
           begin
             if force_init_final or
                cnodeutils.force_init or
                not(has_no_code(finalize_procinfo.code)) then
               begin
                 finalize_procinfo.code:=cnodeutils.wrap_proc_body(finalize_procinfo.procdef,finalize_procinfo.code);
                 finalize_procinfo.generate_code;
                 current_module.flags:=current_module.flags or uf_finalize;
               end
             else
               release_proc_symbol(finalize_procinfo.procdef);
             finalize_procinfo.resetprocdef;
             release_main_proc(finalize_procinfo);
           end;

         symtablestack.pop(current_module.localsymtable);
         symtablestack.pop(current_module.globalsymtable);

         { the last char should always be a point }
         consume(_POINT);

         { reset wpo flags for all defs }
         reset_all_defs;

         if (Errorcount=0) then
           begin
             { tests, if all (interface) forwards are resolved }
             tstoredsymtable(current_module.globalsymtable).check_forwards;
             { check if all private fields are used }
             tstoredsymtable(current_module.globalsymtable).allprivatesused;

             { test static symtable }
             tstoredsymtable(current_module.localsymtable).allsymbolsused;
             tstoredsymtable(current_module.localsymtable).allprivatesused;
             tstoredsymtable(current_module.localsymtable).check_forwards;
             tstoredsymtable(current_module.localsymtable).checklabels;

             { used units }
             current_module.allunitsused;
           end;

         { leave when we got an error }
         if (Errorcount>0) and not status.skip_error then
          begin
            Message1(unit_f_errors_in_unit,tostr(Errorcount));
            status.skip_error:=true;
            module_is_done;
            if not immediate then
              restore_global_state(globalstate,true);
            exit;
          end;

         { if an Objective-C module, generate rtti and module info }
         MaybeGenerateObjectiveCImageInfo(current_module.globalsymtable,current_module.localsymtable);

         { do we need to add the variants unit? }
         maybeloadvariantsunit;

         { generate rtti/init tables }
         write_persistent_type_info(current_module.globalsymtable,true);
         write_persistent_type_info(current_module.localsymtable,false);

         { Tables }
         cnodeutils.InsertThreadvars;

         { Resource strings }
         GenerateResourceStrings;

         { Widestring typed constants }
         cnodeutils.InsertWideInits;

         { Resourcestring references }
         cnodeutils.InsertResStrInits;

         { generate debuginfo }
         if (cs_debuginfo in current_settings.moduleswitches) then
           current_debuginfo.inserttypeinfo;

         { generate imports }
         if current_module.ImportLibraryList.Count>0 then
           importlib.generatelib;

         { insert own objectfile, or say that it's in a library
           (no check for an .o when loading) }
         ag:=is_assembler_generated;
         if ag then
           insertobjectfile
         else
           begin
             current_module.flags:=current_module.flags or uf_no_link;
             current_module.flags:=current_module.flags and not (uf_has_stabs_debuginfo or uf_has_dwarf_debuginfo);
           end;

         if ag then
          begin
            { create callframe info }
            create_dwarf_frame;
            { assemble }
            create_objectfile;
          end;

         { Write out the ppufile after the object file has been created }
         store_interface_crc:=current_module.interface_crc;
         store_indirect_crc:=current_module.indirect_crc;
{$ifdef EXTDEBUG}
         store_crc:=current_module.crc;
{$endif EXTDEBUG}
         if (Errorcount=0) then
           tppumodule(current_module).writeppu;

         if not(cs_compilesystem in current_settings.moduleswitches) then
           begin
             if store_interface_crc<>current_module.interface_crc then
               Message1(unit_u_interface_crc_changed,current_module.ppufilename);
             if store_indirect_crc<>current_module.indirect_crc then
               Message1(unit_u_indirect_crc_changed,current_module.ppufilename);
           end;
{$ifdef EXTDEBUG}
         if not(cs_compilesystem in current_settings.moduleswitches) then
           if (store_crc<>current_module.crc) then
             Message1(unit_u_implementation_crc_changed,current_module.ppufilename);
{$endif EXTDEBUG}

         { release unregistered defs/syms from the localsymtable }
         free_unregistered_localsymtable_elements;
         { release local symtables that are not needed anymore }
         free_localsymtables(current_module.globalsymtable);
         free_localsymtables(current_module.localsymtable);

         { leave when we got an error }
         if (Errorcount>0) and not status.skip_error then
          begin
            Message1(unit_f_errors_in_unit,tostr(Errorcount));
            status.skip_error:=true;
            module_is_done;
            if not immediate then
              restore_global_state(globalstate,true);
            exit;
          end;

{$ifdef debug_devirt}
         { print out all instantiated class/object types }
         writeln('constructed object/class/classreftypes in ',current_module.realmodulename^);
         for i := 0 to current_module.wpoinfo.createdobjtypes.count-1 do
           begin
             write('  ',tdef(current_module.wpoinfo.createdobjtypes[i]).GetTypeName);
             case tdef(current_module.wpoinfo.createdobjtypes[i]).typ of
               objectdef:
                 case tobjectdef(current_module.wpoinfo.createdobjtypes[i]).objecttype of
                   odt_object:
                     writeln(' (object)');
                   odt_class:
                     writeln(' (class)');
                   else
                     internalerror(2008101103);
                 end;
               else
                 internalerror(2008101104);
             end;
           end;

         for i := 0 to current_module.wpoinfo.createdclassrefobjtypes.count-1 do
           begin
             write('  Class Of ',tdef(current_module.wpoinfo.createdclassrefobjtypes[i]).GetTypeName);
             case tdef(current_module.wpoinfo.createdclassrefobjtypes[i]).typ of
               objectdef:
                 case tobjectdef(current_module.wpoinfo.createdclassrefobjtypes[i]).objecttype of
                   odt_class:
                     writeln(' (classrefdef)');
                   else
                     internalerror(2008101105);
                 end
               else
                 internalerror(2008101102);
             end;
           end;
{$endif debug_devirt}

        Message1(unit_u_finished_compiling,current_module.modulename^);

        module_is_done;
        if not immediate then
          restore_global_state(globalstate,true);

        for i:=0 to module.waitingunits.count-1 do
          begin
            waitingmodule:=tmodule(module.waitingunits[i]);
            waitingmodule.waitingforunit.remove(module);
            { only finish the module if it isn't already finished }
            if (waitingmodule.waitingforunit.count=0) and
                assigned(waitingmodule.finishstate) then
              begin
                finish_unit(waitingmodule,false);
                waitingmodule.end_of_parsing;
              end;
          end;
      end;


    procedure proc_package;
      var
        main_file : tinputfile;
        hp,hp2    : tmodule;
        pkg : tpcppackage;
        {finalize_procinfo,
        init_procinfo,
        main_procinfo : tcgprocinfo;}
        force_init_final : boolean;
        uu : tused_unit;
        module_name: ansistring;
        pentry: ppackageentry;
      begin
         Status.IsPackage:=true;
         Status.IsExe:=true;
         parse_only:=false;
         {main_procinfo:=nil;
         init_procinfo:=nil;
         finalize_procinfo:=nil;}

         if not (tf_supports_packages in target_info.flags) then
           message1(parser_e_packages_not_supported,target_info.name);

         if not RelocSectionSetExplicitly then
           RelocSection:=true;

         { Relocation works only without stabs under Windows when }
         { external linker (LD) is used.  LD generates relocs for }
         { stab sections which is not loaded in memory. It causes }
         { AV error when DLL is loaded and relocation is needed.  }
         { Internal linker does not have this problem.            }
         if RelocSection and
            (target_info.system in systems_all_windows+[system_i386_wdosx]) and
            (cs_link_extern in current_settings.globalswitches) then
           begin
              include(current_settings.globalswitches,cs_link_strip);
              { Warning stabs info does not work with reloc section !! }
              if (cs_debuginfo in current_settings.moduleswitches) and
                 (target_dbg.id=dbg_stabs) then
                begin
                  Message1(parser_w_parser_reloc_no_debug,current_module.mainsource);
                  Message(parser_w_parser_win32_debug_needs_WN);
                  exclude(current_settings.moduleswitches,cs_debuginfo);
                end;
           end;
         { get correct output names }
         main_file := current_scanner.inputfile;
         while assigned(main_file.next) do
           main_file := main_file.next;

         current_module.SetFileName(main_file.path+main_file.name,true);

         { consume _PACKAGE word }
         consume(_ID);

         module_name:=orgpattern;
         consume(_ID);
         while token=_POINT do
           begin
             consume(_POINT);
             module_name:=module_name+'.'+orgpattern;
             consume(_ID);
           end;

         current_module.setmodulename(module_name);
         current_module.ispackage:=true;
         exportlib.preparelib(module_name);
         pkg:=tpcppackage.create(module_name);

         if tf_library_needs_pic in target_info.flags then
           include(current_settings.moduleswitches,cs_create_pic);

         { setup things using the switches, do this before the semicolon, because after the semicolon has been
           read, all following directives are parsed as well }

         setupglobalswitches;

         consume(_SEMICOLON);

         { global switches are read, so further changes aren't allowed }
         current_module.in_global:=false;

         { set implementation flag }
         current_module.in_interface:=false;
         current_module.interface_compiled:=true;

         { insert after the unit symbol tables the static symbol table }
         { of the program                                             }
         current_module.localsymtable:=tstaticsymtable.create(current_module.modulename^,current_module.moduleid);

         { ensure that no packages are picked up from the options }
         packagelist.clear;

         {Read the packages used by the package we compile.}
         if (token=_ID) and (idtoken=_REQUIRES) then
           begin
             { consume _REQUIRES word }
             consume(_ID);
             while true do
               begin
                 if token=_ID then
                   begin
                     module_name:=orgpattern;
                     consume(_ID);
                     while token=_POINT do
                       begin
                         consume(_POINT);
                         module_name:=module_name+'.'+orgpattern;
                         consume(_ID);
                       end;
                     add_package(module_name,false,true);
                   end
                 else
                   consume(_ID);
                 if token=_COMMA then
                   consume(_COMMA)
                 else
                   break;
               end;
             consume(_SEMICOLON);
           end;

         { now load all packages, so that we can determine whether a unit is
           already provided by one of the loaded packages }
         load_packages;

         if packagelist.Count>0 then
           begin
             { this means the SYSTEM unit *must* be part of one of the required
               packages, so load it }
             AddUnit('system',false);
             systemunit:=tglobalsymtable(symtablestack.top);
             load_intern_types;
           end;

         {Load the units used by the program we compile.}
         if (token=_ID) and (idtoken=_CONTAINS) then
           begin
             { consume _CONTAINS word }
             consume(_ID);
             while true do
               begin
                 if token=_ID then
                   begin
                     module_name:=orgpattern;
                     consume(_ID);
                     while token=_POINT do
                       begin
                         consume(_POINT);
                         module_name:=module_name+'.'+orgpattern;
                         consume(_ID);
                       end;
                     hp:=AddUnit(module_name);
                     if (hp.modulename^='SYSTEM') and not assigned(systemunit) then
                       begin
                         systemunit:=tglobalsymtable(hp.globalsymtable);
                         load_intern_types;
                       end;
                   end
                 else
                   consume(_ID);
                 if token=_COMMA then
                   consume(_COMMA)
                 else break;
               end;
             consume(_SEMICOLON);
           end;

         { All units are read, now give them a number }
         current_module.updatemaps;

         hp:=tmodule(loaded_units.first);
         while assigned(hp) do
           begin
             if (hp<>current_module) and not assigned(hp.package) then
               begin
                 if (hp.flags and uf_package_deny) <> 0 then
                   message1(package_e_unit_deny_package,hp.realmodulename^);
                 { part of the package's used, aka contained units? }
                 uu:=tused_unit(current_module.used_units.first);
                 while assigned(uu) do
                   begin
                     if uu.u=hp then
                       break;
                     uu:=tused_unit(uu.next);
                   end;
                 if not assigned(uu) then
                   message2(package_n_implicit_unit_import,hp.realmodulename^,current_module.realmodulename^);
               end;
             { was this unit listed as a contained unit? If so => error }
             if (hp<>current_module) and assigned(hp.package) then
               begin
                 uu:=tused_unit(current_module.used_units.first);
                 while assigned(uu) do
                   begin
                     if uu.u=hp then
                       break;
                     uu:=tused_unit(uu.next);
                   end;
                 if assigned(uu) then
                   message2(package_e_unit_already_contained_in_package,hp.realmodulename^,hp.package.realpackagename^);
               end;
             hp:=tmodule(hp.next);
           end;

         {Insert the name of the main program into the symbol table.}
         if current_module.realmodulename^<>'' then
           tabstractunitsymtable(current_module.localsymtable).insertunit(cunitsym.create(current_module.realmodulename^,current_module));

         Message1(parser_u_parsing_implementation,current_module.mainsource);

         symtablestack.push(current_module.localsymtable);

         { create whole program optimisation information }
         current_module.wpoinfo:=tunitwpoinfo.create;

         { should we force unit initialization? }
         force_init_final:=tstaticsymtable(current_module.localsymtable).needs_init_final;
         if force_init_final or cnodeutils.force_init then
           {init_procinfo:=gen_implicit_initfinal(uf_init,current_module.localsymtable)};

         { Add symbol to the exports section for win32 so smartlinking a
           DLL will include the edata section }
         if assigned(exportlib) and
            (target_info.system in [system_i386_win32,system_i386_wdosx]) and
            ((current_module.flags and uf_has_exports)<>0) then
           current_asmdata.asmlists[al_procedures].concat(tai_const.createname(make_mangledname('EDATA',current_module.localsymtable,''),0));

         { all labels must be defined before generating code }
         if Errorcount=0 then
           tstoredsymtable(current_module.localsymtable).checklabels;

         symtablestack.pop(current_module.localsymtable);

         { consume the last point }
         consume(_END);
         consume(_POINT);

         if (Errorcount=0) then
           begin
             { test static symtable }
             tstoredsymtable(current_module.localsymtable).allsymbolsused;
             tstoredsymtable(current_module.localsymtable).allprivatesused;
             tstoredsymtable(current_module.localsymtable).check_forwards;

             { Note: all contained units are considered as used }
           end;

         if target_info.system in systems_windows then
           begin
             { ToDo: generate an entry dummy using higher level functionality }
             new_section(current_asmdata.asmlists[al_procedures],sec_code,'',0);
             current_asmdata.asmlists[al_procedures].concat(tai_symbol.createname_global('_DLLMainCRTStartup',AT_FUNCTION,0,voidcodepointertype));
             gen_fpc_dummy(current_asmdata.asmlists[al_procedures]);
           end;

         { leave when we got an error }
         if (Errorcount>0) and not status.skip_error then
           begin
             Message1(unit_f_errors_in_unit,tostr(Errorcount));
             status.skip_error:=true;
             pkg.free;
             exit;
           end;

         { remove all unused units, this happends when units are removed
           from the uses clause in the source and the ppu was already being loaded }
         hp:=tmodule(loaded_units.first);
         while assigned(hp) do
          begin
            hp2:=hp;
            hp:=tmodule(hp.next);
            if assigned(hp2.package) then
              add_package_unit_ref(hp2.package);
            if hp2.is_unit and
               not assigned(hp2.globalsymtable) then
              loaded_units.remove(hp2);
          end;

         exportlib.ignoreduplicates:=true;

         { force exports }
         uu:=tused_unit(usedunits.first);
         while assigned(uu) do
           begin
             if not assigned(systemunit) and (uu.u.modulename^='SYSTEM') then
               begin
                 systemunit:=tglobalsymtable(uu.u.globalsymtable);
                 load_intern_types;
               end;
             if not assigned(uu.u.package) then
               export_unit(uu.u);

             uu:=tused_unit(uu.next);
           end;

{$ifdef arm}
         { Insert .pdata section for arm-wince.
           It is needed for exception handling. }
         if target_info.system in [system_arm_wince] then
           InsertPData;
{$endif arm}

         { generate debuginfo }
         if (cs_debuginfo in current_settings.moduleswitches) then
           current_debuginfo.inserttypeinfo;

         exportlib.generatelib;

         exportlib.ignoreduplicates:=false;

         { create import libraries for all packages }
         if packagelist.count>0 then
           createimportlibfromexternals;

         { generate imports }
         if current_module.ImportLibraryList.Count>0 then
           importlib.generatelib;

         { Reference all DEBUGINFO sections from the main .fpc section }
         if (cs_debuginfo in current_settings.moduleswitches) then
           current_debuginfo.referencesections(current_asmdata.asmlists[al_procedures]);

         { insert own objectfile }
         insertobjectfile;

         { assemble and link }
         create_objectfile;

         { We might need the symbols info if not using
           the default do_extractsymbolinfo
           which is a dummy function PM }
         needsymbolinfo:=do_extractsymbolinfo<>@def_extractsymbolinfo;
         { release all local symtables that are not needed anymore }
         if (not needsymbolinfo) then
           free_localsymtables(current_module.localsymtable);

         { leave when we got an error }
         if (Errorcount>0) and not status.skip_error then
          begin
            Message1(unit_f_errors_in_unit,tostr(Errorcount));
            status.skip_error:=true;
            pkg.free;
            exit;
          end;

         if (not current_module.is_unit) then
           begin
             { we add all loaded units that are not part of a package to the
               package; this includes units in the "contains" section as well
               as implicitely imported ones }
             hp:=tmodule(loaded_units.first);
             while assigned(hp) do
              begin
                if (hp<>current_module) then
                  begin
                    if not assigned(hp.package) then
                      begin
                        pkg.addunit(hp);
                        check_for_indirect_package_usages(hp.used_units);
                      end
                    else
                      begin
                        pentry:=ppackageentry(packagelist.find(hp.package.packagename^));
                        if not assigned(pentry) then
                          internalerror(2015112301);
                        pkg.add_required_package(hp.package);
                      end;
                  end;
                hp:=tmodule(hp.next);
              end;

             pkg.initmoduleinfo(current_module);

             { create the executable when we are at level 1 }
             if (compile_level=1) then
               begin
                 { create global resource file by collecting all resource files }
                 CollectResourceFiles;
                 { write .def file }
                 if (cs_link_deffile in current_settings.globalswitches) then
                   deffile.writefile;

                 { generate the pcp file }
                 pkg.savepcp;

                 { insert all .o files from all loaded units and
                   unload the units, we don't need them anymore.
                   Keep the current_module because that is still needed }
                 hp:=tmodule(loaded_units.first);
                 while assigned(hp) do
                  begin
                    { only link in those units which should become part of this
                      package }
                    if not assigned(hp.package) then
                      linker.AddModuleFiles(hp);
                    hp2:=tmodule(hp.next);
                    if (hp<>current_module) and
                       (not needsymbolinfo) then
                      begin
                        loaded_units.remove(hp);
                        hp.free;
                      end;
                    hp:=hp2;
                  end;
                 { add the library of directly used packages }
                 add_package_libs(linker);
                 { and now link the package library }
                 linker.MakeSharedLibrary
               end;

             { Give Fatal with error count for linker errors }
             if (Errorcount>0) and not status.skip_error then
              begin
                Message1(unit_f_errors_in_unit,tostr(Errorcount));
                status.skip_error:=true;
              end;

             pkg.free;
          end;
      end;


    procedure proc_program(islibrary : boolean);
      type
        TProgramParam = record
          name : ansistring;
          nr : dword;
        end;
      var
         main_file : tinputfile;
         hp,hp2    : tmodule;
         finalize_procinfo,
         init_procinfo,
         main_procinfo : tcgprocinfo;
         force_init_final : boolean;
         resources_used : boolean;
         initname,
         program_name : ansistring;
         consume_semicolon_after_uses : boolean;
         ps : tprogramparasym;
         paramnum : longint;
         textsym : ttypesym;
         sc : array of TProgramParam;
         i : Longint;
         sysinitmod: tmodule;
      begin
         Status.IsLibrary:=IsLibrary;
         Status.IsPackage:=false;
         Status.IsExe:=true;
         parse_only:=false;
         main_procinfo:=nil;
         init_procinfo:=nil;
         finalize_procinfo:=nil;
         resources_used:=false;
         { make the compiler happy and avoid an uninitialized variable warning on Setlength(sc,length(sc)+1); }
         sc:=nil;

         { DLL defaults to create reloc info }
         if islibrary then
           begin
             if not RelocSectionSetExplicitly then
               RelocSection:=true;
           end;

         { Relocation works only without stabs under Windows when }
         { external linker (LD) is used.  LD generates relocs for }
         { stab sections which is not loaded in memory. It causes }
         { AV error when DLL is loaded and relocation is needed.  }
         { Internal linker does not have this problem.            }
         if RelocSection and
            (target_info.system in systems_all_windows+[system_i386_wdosx]) and
            (cs_link_extern in current_settings.globalswitches) then
           begin
              include(current_settings.globalswitches,cs_link_strip);
              { Warning stabs info does not work with reloc section !! }
              if (cs_debuginfo in current_settings.moduleswitches) and
                 (target_dbg.id=dbg_stabs) then
                begin
                  Message1(parser_w_parser_reloc_no_debug,current_module.mainsource);
                  Message(parser_w_parser_win32_debug_needs_WN);
                  exclude(current_settings.moduleswitches,cs_debuginfo);
                end;
           end;
         { get correct output names }
         main_file := current_scanner.inputfile;
         while assigned(main_file.next) do
           main_file := main_file.next;

         current_module.SetFileName(main_file.path+main_file.name,true);

         if islibrary then
           begin
              consume(_LIBRARY);
              program_name:=orgpattern;
              consume(_ID);
              while token=_POINT do
                begin
                  consume(_POINT);
                  program_name:=program_name+'.'+orgpattern;
                  consume(_ID);
                end;
              current_module.setmodulename(program_name);
              current_module.islibrary:=true;
              exportlib.preparelib(program_name);

              if tf_library_needs_pic in target_info.flags then
                begin
                  include(current_settings.moduleswitches,cs_create_pic);
                  { also set create_pic for all unit compilation }
                  include(init_settings.moduleswitches,cs_create_pic);
                end;

              { setup things using the switches, do this before the semicolon, because after the semicolon has been
                read, all following directives are parsed as well }
              setupglobalswitches;

              consume(_SEMICOLON);
           end
         else
           { is there an program head ? }
           if token=_PROGRAM then
            begin
              consume(_PROGRAM);
              program_name:=orgpattern;
              consume(_ID);
              while token=_POINT do
                begin
                  consume(_POINT);
                  program_name:=program_name+'.'+orgpattern;
                  consume(_ID);
                end;
              current_module.setmodulename(program_name);
              if (target_info.system in systems_unit_program_exports) then
                exportlib.preparelib(program_name);
              if token=_LKLAMMER then
                begin
                   consume(_LKLAMMER);
                   paramnum:=1;
                   repeat
                     if m_isolike_program_para in current_settings.modeswitches then
                       begin
                         if (pattern<>'INPUT') and (pattern<>'OUTPUT') then
                           begin
                             { the symtablestack is not setup here, so text must be created later on }
                             Setlength(sc,length(sc)+1);
                             with sc[high(sc)] do
                               begin
                                 name:=pattern;
                                 nr:=paramnum;
                               end;
                             inc(paramnum);
                           end;
                       end;
                     consume(_ID);
                   until not try_to_consume(_COMMA);
                   consume(_RKLAMMER);
                end;

              { setup things using the switches, do this before the semicolon, because after the semicolon has been
                read, all following directives are parsed as well }
              setupglobalswitches;

              consume(_SEMICOLON);
            end
         else
           begin
             if (target_info.system in systems_unit_program_exports) then
               exportlib.preparelib(current_module.realmodulename^);

             { setup things using the switches }
             setupglobalswitches;
           end;

         { load all packages, so we know whether a unit is contained inside a
           package or not }
         load_packages;

         { global switches are read, so further changes aren't allowed }
         current_module.in_global:=false;

         { set implementation flag }
         current_module.in_interface:=false;
         current_module.interface_compiled:=true;

         { insert after the unit symbol tables the static symbol table
           of the program                                              }
         current_module.localsymtable:=tstaticsymtable.create(current_module.modulename^,current_module.moduleid);

         { load standard units (system,objpas,profile unit) }
         loaddefaultunits;

         { Load units provided on the command line }
         loadautounits;

         { insert iso program parameters }
         if length(sc)>0 then
           begin
             textsym:=search_system_type('TEXT');
             if not(assigned(textsym)) then
               internalerror(2013011201);
             for i:=0 to high(sc) do
               begin
                 ps:=cprogramparasym.create(sc[i].name,sc[i].nr);
                 current_module.localsymtable.insert(ps,true);
               end;
           end;

         { Load the units used by the program we compile. }
         if token=_USES then
           begin
             loadunits(nil);
             consume_semicolon_after_uses:=true;
           end
         else
           consume_semicolon_after_uses:=false;

         { All units are read, now give them a number }
         current_module.updatemaps;

         { consume the semicolon after maps have been updated else conditional compiling expressions
           might cause internal errors, see tw8611 }
         if consume_semicolon_after_uses then
           consume(_SEMICOLON);

         {Insert the name of the main program into the symbol table.}
         if current_module.realmodulename^<>'' then
           tabstractunitsymtable(current_module.localsymtable).insertunit(cunitsym.create(current_module.realmodulename^,current_module));

         Message1(parser_u_parsing_implementation,current_module.mainsource);

         symtablestack.push(current_module.localsymtable);

{$ifdef jvm}
         { fake classdef to represent the class corresponding to the unit }
         addmoduleclass;
{$endif}

         { Insert _GLOBAL_OFFSET_TABLE_ symbol if system uses it }
         maybe_load_got;

         { create whole program optimisation information }
         current_module.wpoinfo:=tunitwpoinfo.create;

         { The program intialization needs an alias, so it can be called
           from the bootstrap code.}
         if islibrary then
          begin
            main_procinfo:=create_main_proc(make_mangledname('',current_module.localsymtable,mainaliasname),potype_proginit,current_module.localsymtable);
            { Win32 startup code needs a single name }
            if not(target_info.system in (systems_darwin+systems_aix)) then
              main_procinfo.procdef.aliasnames.insert('PASCALMAIN')
            else
              main_procinfo.procdef.aliasnames.insert(target_info.Cprefix+'PASCALMAIN');

            { ToDo: systems that use indirect entry info, but check back with Windows! }
            if target_info.system in systems_darwin then
              { we need to call FPC_LIBMAIN in sysinit which in turn will call PascalMain }
              initname:=target_info.cprefix+'FPC_LIBMAIN'
            else
              initname:=main_procinfo.procdef.mangledname;
            { setinitname may generate a new section -> don't add to the
              current list, because we assume this remains a text section
              -- add to pure assembler section, so in case of special directives
                they are directly added to the assembler output by llvm }
            exportlib.setinitname(current_asmdata.AsmLists[al_pure_assembler],initname);
          end
         else if (target_info.system in ([system_i386_netware,system_i386_netwlibc,system_powerpc_macos]+systems_darwin+systems_aix)) then
           begin
             { create a stub with the name of the desired main routine, with
               the same signature as the C "main" function, and call through to
               FPC_SYSTEMMAIN, which will initialise everything based on its
               parameters. This function cannot be in the system unit, because
               its name can be configured on the command line (for use with e.g.
               SDL, where the main function should be called SDL_main) }
             main_procinfo:=create_main_proc(mainaliasname,potype_mainstub,current_module.localsymtable);
             call_through_new_name(main_procinfo.procdef,target_info.cprefix+'FPC_SYSTEMMAIN');
             main_procinfo.free;
             { now create the PASCALMAIN routine (which will be called from
               FPC_SYSTEMMAIN) }
             main_procinfo:=create_main_proc('PASCALMAIN',potype_proginit,current_module.localsymtable);
           end
         else
           begin
             main_procinfo:=create_main_proc(mainaliasname,potype_proginit,current_module.localsymtable);
             main_procinfo.procdef.aliasnames.insert('PASCALMAIN');
           end;
         main_procinfo.parse_body;
         { save file pos for debuginfo }
         current_module.mainfilepos:=main_procinfo.entrypos;

         { Generate specializations of objectdefs methods }
         generate_specialization_procs;

         { Generate VMTs }
         if Errorcount=0 then
           write_vmts(current_module.localsymtable,false);

         { add implementations for synthetic method declarations added by
           the compiler }
         add_synthetic_method_implementations(current_module.localsymtable);

         { should we force unit initialization? }
         force_init_final:=tstaticsymtable(current_module.localsymtable).needs_init_final;
         if force_init_final or cnodeutils.force_init then
           init_procinfo:=gen_implicit_initfinal(uf_init,current_module.localsymtable);

         { Add symbol to the exports section for win32 so smartlinking a
           DLL will include the edata section }
         if assigned(exportlib) and
            (target_info.system in [system_i386_win32,system_i386_wdosx]) and
            ((current_module.flags and uf_has_exports)<>0) then
           current_asmdata.asmlists[al_procedures].concat(tai_const.createname(make_mangledname('EDATA',current_module.localsymtable,''),0));

         { finalize? }
         if token=_FINALIZATION then
           begin
              { Parse the finalize }
              finalize_procinfo:=create_main_proc(make_mangledname('',current_module.localsymtable,'finalize'),potype_unitfinalize,current_module.localsymtable);
              finalize_procinfo.procdef.aliasnames.insert(make_mangledname('FINALIZE$',current_module.localsymtable,''));
              finalize_procinfo.procdef.aliasnames.insert('PASCALFINALIZE');
              finalize_procinfo.parse_body;
           end
         else
           if force_init_final or cnodeutils.force_final then
             finalize_procinfo:=gen_implicit_initfinal(uf_finalize,current_module.localsymtable);

          { the finalization routine of libraries is generic (and all libraries need to }
          { be finalized, so they can finalize any units they use                       }
          { Place in "pure assembler" list so that the llvm assembler writer
            directly emits the generated directives }
          if (islibrary) then
            exportlib.setfininame(current_asmdata.asmlists[al_pure_assembler],'FPC_LIB_EXIT');

         { all labels must be defined before generating code }
         if Errorcount=0 then
           tstoredsymtable(current_module.localsymtable).checklabels;

         { See remark in unit init/final }
         main_procinfo.generate_code;
         main_procinfo.resetprocdef;
         release_main_proc(main_procinfo);
         if assigned(init_procinfo) then
           begin
             { initialization can be implicit only }
             current_module.flags:=current_module.flags or uf_init;
             init_procinfo.code:=cnodeutils.wrap_proc_body(init_procinfo.procdef,init_procinfo.code);
             init_procinfo.generate_code;
             init_procinfo.resetprocdef;
             release_main_proc(init_procinfo);
           end;
         if assigned(finalize_procinfo) then
           begin
             if force_init_final or
                cnodeutils.force_init or
                not(has_no_code(finalize_procinfo.code)) then
               begin
                 finalize_procinfo.code:=cnodeutils.wrap_proc_body(finalize_procinfo.procdef,finalize_procinfo.code);
                 finalize_procinfo.generate_code;
                 current_module.flags:=current_module.flags or uf_finalize;
               end;
             finalize_procinfo.resetprocdef;
             release_main_proc(finalize_procinfo);
           end;

         symtablestack.pop(current_module.localsymtable);

         { consume the last point }
         consume(_POINT);

         { reset wpo flags for all defs }
         reset_all_defs;

         if (Errorcount=0) then
           begin
             { test static symtable }
             tstoredsymtable(current_module.localsymtable).allsymbolsused;
             tstoredsymtable(current_module.localsymtable).allprivatesused;
             tstoredsymtable(current_module.localsymtable).check_forwards;

             current_module.allunitsused;
           end;

         { leave when we got an error }
         if (Errorcount>0) and not status.skip_error then
           begin
             Message1(unit_f_errors_in_unit,tostr(Errorcount));
             status.skip_error:=true;
             exit;
           end;

         { remove all unused units, this happens when units are removed
           from the uses clause in the source and the ppu was already being loaded }
         hp:=tmodule(loaded_units.first);
         while assigned(hp) do
          begin
            hp2:=hp;
            hp:=tmodule(hp.next);
            if hp2.is_unit and
               not assigned(hp2.globalsymtable) then
                begin
                  loaded_units.remove(hp2);
                  unloaded_units.concat(hp2);
                end;
          end;

         { do we need to add the variants unit? }
         maybeloadvariantsunit;

         { Now that everything has been compiled we know if we need resource
           support. If not, remove the unit. }
         resources_used:=MaybeRemoveResUnit;

         linker.initsysinitunitname;
         if target_info.system in systems_internal_sysinit then
         begin
           { add start/halt unit }
           sysinitmod:=AddUnit(linker.sysinitunit);
         end
         else
           sysinitmod:=nil;

{$ifdef arm}
         { Insert .pdata section for arm-wince.
           It is needed for exception handling. }
         if target_info.system in [system_arm_wince] then
           InsertPData;
{$endif arm}

         cnodeutils.InsertThreadvars;

         { generate rtti/init tables }
         write_persistent_type_info(current_module.localsymtable,false);

         { if an Objective-C module, generate rtti and module info }
         MaybeGenerateObjectiveCImageInfo(nil,current_module.localsymtable);

         { generate debuginfo }
         if (cs_debuginfo in current_settings.moduleswitches) then
           current_debuginfo.inserttypeinfo;

         if islibrary or (target_info.system in systems_unit_program_exports) then
           exportlib.generatelib;

         { Reference all DEBUGINFO sections from the main .fpc section }
         if (cs_debuginfo in current_settings.moduleswitches) then
           current_debuginfo.referencesections(current_asmdata.asmlists[al_procedures]);

         { Resource strings }
         GenerateResourceStrings;

         { Windows widestring needing initialization }
         cnodeutils.InsertWideInits;

         { Resourcestring references (const foo:string=someresourcestring) }
         cnodeutils.InsertResStrInits;

         { insert Tables and StackLength }
         cnodeutils.InsertInitFinalTable;
         cnodeutils.InsertThreadvarTablesTable;
         cnodeutils.InsertResourceTablesTable;
         cnodeutils.InsertWideInitsTablesTable;
         cnodeutils.InsertResStrTablesTable;
         cnodeutils.InsertMemorySizes;

         { Insert symbol to resource info }
         cnodeutils.InsertResourceInfo(resources_used);

         { create callframe info }
         create_dwarf_frame;

         { create import library for all packages }
         if packagelist.count>0 then
           createimportlibfromexternals;

         { generate imports }
         if current_module.ImportLibraryList.Count>0 then
           importlib.generatelib;

         { insert own objectfile }
         insertobjectfile;

         { assemble and link }
         create_objectfile;

         { We might need the symbols info if not using
           the default do_extractsymbolinfo
           which is a dummy function PM }
         needsymbolinfo:=
           (do_extractsymbolinfo<>@def_extractsymbolinfo) or
           ((current_settings.genwpoptimizerswitches*WPOptimizationsNeedingAllUnitInfo)<>[]);

         { release all local symtables that are not needed anymore }
         if (not needsymbolinfo) then
           free_localsymtables(current_module.localsymtable);

         { leave when we got an error }
         if (Errorcount>0) and not status.skip_error then
          begin
            Message1(unit_f_errors_in_unit,tostr(Errorcount));
            status.skip_error:=true;
            exit;
          end;

         if (not current_module.is_unit) then
           begin
             { create the executable when we are at level 1 }
             if (compile_level=1) then
               begin
                 { create global resource file by collecting all resource files }
                 CollectResourceFiles;
                 { write .def file }
                 if (cs_link_deffile in current_settings.globalswitches) then
                  deffile.writefile;
                 { link SysInit (if any) first, to have behavior consistent with
                   assembler startup files }
                 if assigned(sysinitmod) then
                   linker.AddModuleFiles(sysinitmod);
                 { insert all .o files from all loaded units and
                   unload the units, we don't need them anymore.
                   Keep the current_module because that is still needed }
                 hp:=tmodule(loaded_units.first);
                 while assigned(hp) do
                  begin
                    if (hp<>sysinitmod) and (hp.flags and uf_in_library=0) then
                      linker.AddModuleFiles(hp);
                    hp2:=tmodule(hp.next);
                    if assigned(hp.package) then
                      add_package_unit_ref(hp.package);
                    if (hp<>current_module) and
                       (not needsymbolinfo) then
                      begin
                        loaded_units.remove(hp);
                        hp.free;
                      end;
                    hp:=hp2;
                  end;
                 { free also unneeded units we didn't free before }
                 if not needsymbolinfo then
                   unloaded_units.Clear;
                 { add all directly used packages as libraries }
                 add_package_libs(linker);
                 { finally we can create a executable }
                 if current_module.islibrary then
                   linker.MakeSharedLibrary
                 else
                   linker.MakeExecutable;

                 { collect all necessary information for whole-program optimization }
                 wpoinfomanager.extractwpoinfofromprogram;
               end;


             { Give Fatal with error count for linker errors }
             if (Errorcount>0) and not status.skip_error then
              begin
                Message1(unit_f_errors_in_unit,tostr(Errorcount));
                status.skip_error:=true;
              end;
          end;
      end;

end.