freepascal.compiler/compiler/assemble.pas

{
    $Id$
    Copyright (c) 1998-2002 by Peter Vreman

    This unit handles the assemblerfile write and assembler calls of FPC

    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.

 ****************************************************************************
}
{# @abstract(This unit handles the assembler file write and assembler calls of FPC)
   Handles the calls to the actual external assemblers, as well as the generation
   of object files for smart linking. Also contains the base class for writing
   the assembler statements to file.
}
unit assemble;

{$i fpcdefs.inc}

interface


    uses
{$ifdef Delphi}
      sysutils,
      dmisc,
{$else Delphi}
      strings,
      dos,
{$endif Delphi}
      systems,globtype,globals,aasmbase,aasmtai,ogbase;

    const
       { maximum of aasmoutput lists there will be }
       maxoutputlists = 10;
       { buffer size for writing the .s file }
       AsmOutSize=32768;

    type
      TAssembler=class(TAbstractAssembler)
      public
      {filenames}
        path     : pathstr;
        name     : namestr;
        asmfile,         { current .s and .o file }
        objfile  : string;
        ppufilename : string;
        asmprefix : string;
        SmartAsm : boolean;
        SmartFilesCount,
        SmartHeaderCount : longint;
        Constructor Create(smart:boolean);virtual;
        Destructor Destroy;override;
        procedure NextSmartName(place:tcutplace);
        procedure MakeObject;virtual;abstract;
      end;

      {# This is the base class which should be overriden for each each
         assembler writer. It is used to actually assembler a file,
         and write the output to the assembler file.
      }
      TExternalAssembler=class(TAssembler)
      private
        procedure CreateSmartLinkPath(const s:string);
      protected
      {outfile}
        AsmSize,
        AsmStartSize,
        outcnt   : longint;
        outbuf   : array[0..AsmOutSize-1] of char;
        outfile  : file;
      public
        {# Returns the complete path and executable name of the assembler
           program.

           It first tries looking in the UTIL directory if specified,
           otherwise it searches in the free pascal binary directory, in
           the current working directory and then in the  directories
           in the $PATH environment.}
        Function  FindAssembler:string;

        {# Actually does the call to the assembler file. Returns false
           if the assembling of the file failed.}
        Function  CallAssembler(const command,para:string):Boolean;

        Function  DoAssemble:boolean;virtual;
        Procedure RemoveAsm;
        Procedure AsmFlush;
        Procedure AsmClear;

        {# Write a string to the assembler file }
        Procedure AsmWrite(const s:string);

        {# Write a string to the assembler file }
        Procedure AsmWritePChar(p:pchar);

        {# Write a string to the assembler file followed by a new line }
        Procedure AsmWriteLn(const s:string);

        {# Write a new line to the assembler file }
        Procedure AsmLn;

        procedure AsmCreate(Aplace:tcutplace);
        procedure AsmClose;

        {# This routine should be overriden for each assembler, it is used
           to actually write the abstract assembler stream to file.}
        procedure WriteTree(p:TAAsmoutput);virtual;

        {# This routine should be overriden for each assembler, it is used
           to actually write all the different abstract assembler streams
           by calling for each stream type, the @var(WriteTree) method.}
        procedure WriteAsmList;virtual;
      public
        Constructor Create(smart:boolean);override;
        procedure MakeObject;override;
      end;

      TInternalAssembler=class(TAssembler)
      public
        constructor create(smart:boolean);override;
        destructor  destroy;override;
        procedure MakeObject;override;
      protected
        { object alloc and output }
        objectalloc  : TAsmObjectAlloc;
        objectdata   : TAsmObjectData;
        objectoutput : tobjectoutput;
      private
        { the aasmoutput lists that need to be processed }
        lists        : byte;
        list         : array[1..maxoutputlists] of TAAsmoutput;
        { current processing }
        currlistidx  : byte;
        currlist     : TAAsmoutput;
        currpass     : byte;
{$ifdef GDB}
        n_line       : byte;     { different types of source lines }
        linecount,
        includecount : longint;
        funcname     : tasmsymbol;
        stabslastfileinfo : tfileposinfo;
        procedure convertstabs(p:pchar);
        procedure emitlineinfostabs(nidx,line : longint);
        procedure emitstabs(s:string);
        procedure WriteFileLineInfo(var fileinfo : tfileposinfo);
        procedure StartFileLineInfo;
        procedure EndFileLineInfo;
{$endif}
        function  MaybeNextList(var hp:Tai):boolean;
        function  TreePass0(hp:Tai):Tai;
        function  TreePass1(hp:Tai):Tai;
        function  TreePass2(hp:Tai):Tai;
        procedure writetree;
        procedure writetreesmart;
      end;

    TAssemblerClass = class of TAssembler;

    Procedure GenerateAsm(smart:boolean);
    Procedure OnlyAsm;

    procedure RegisterAssembler(const r:tasminfo;c:TAssemblerClass);
    procedure InitAssembler;
    procedure DoneAssembler;


Implementation

    uses
{$ifdef hasunix}
  {$ifdef ver1_0}
      linux,
  {$else}
      unix,
  {$endif}
{$endif}
      cutils,script,fmodule,verbose,
{$ifdef memdebug}
      cclasses,
{$endif memdebug}
{$ifdef GDB}
      finput,
      gdb,
{$endif GDB}
{$ifdef m68k}
      cpuinfo,
{$endif m68k}
      cpubase,aasmcpu
      ;

    var
      CAssembler : array[tasm] of TAssemblerClass;


{*****************************************************************************
                                   TAssembler
*****************************************************************************}

    Constructor TAssembler.Create(smart:boolean);
      begin
      { load start values }
        asmfile:=current_module.get_asmfilename;
        objfile:=current_module.objfilename^;
        name:=Lower(current_module.modulename^);
        path:=current_module.outputpath^;
        asmprefix := current_module.asmprefix^;
        if not assigned(current_module.outputpath) then
          ppufilename := ''
        else
          ppufilename := current_module.ppufilename^;
        SmartAsm:=smart;
        SmartFilesCount:=0;
        SmartHeaderCount:=0;
        SmartLinkOFiles.Clear;
      end;


    Destructor TAssembler.Destroy;
      begin
      end;


    procedure TAssembler.NextSmartName(place:tcutplace);
      var
        s : string;
      begin
        inc(SmartFilesCount);
        if SmartFilesCount>999999 then
         Message(asmw_f_too_many_asm_files);
        case place of
          cut_begin :
            begin
              inc(SmartHeaderCount);
              s:=asmprefix+tostr(SmartHeaderCount)+'h';
            end;
          cut_normal :
            s:=asmprefix+tostr(SmartHeaderCount)+'s';
          cut_end :
            s:=asmprefix+tostr(SmartHeaderCount)+'t';
        end;
        AsmFile:=Path+FixFileName(s+tostr(SmartFilesCount)+target_info.asmext);
        ObjFile:=Path+FixFileName(s+tostr(SmartFilesCount)+target_info.objext);
        { insert in container so it can be cleared after the linking }
        SmartLinkOFiles.Insert(Objfile);
      end;


{*****************************************************************************
                                 TExternalAssembler
*****************************************************************************}

    Function DoPipe:boolean;
      begin
        DoPipe:=(cs_asm_pipe in aktglobalswitches) and
                not(cs_asm_leave in aktglobalswitches)
                and ((aktoutputformat=as_gas));
      end;


    Constructor TExternalAssembler.Create(smart:boolean);
      begin
        inherited Create(smart);
        if SmartAsm then
         begin
           path:=FixPath(path+FixFileName(name)+target_info.smartext,false);
           CreateSmartLinkPath(path);
         end;
        Outcnt:=0;
      end;


    procedure TExternalAssembler.CreateSmartLinkPath(const s:string);
      var
        dir : searchrec;
        hs  : string;
      begin
        if PathExists(s) then
         begin
           { the path exists, now we clean only all the .o and .s files }
           { .o files }
           findfirst(s+source_info.dirsep+'*'+target_info.objext,anyfile,dir);
           while (doserror=0) do
            begin
              RemoveFile(s+source_info.dirsep+dir.name);
              findnext(dir);
            end;
           findclose(dir);
           { .s files }
           findfirst(s+source_info.dirsep+'*'+target_info.asmext,anyfile,dir);
           while (doserror=0) do
            begin
              RemoveFile(s+source_info.dirsep+dir.name);
              findnext(dir);
            end;
           findclose(dir);
         end
        else
         begin
           hs:=s;
           if hs[length(hs)] in ['/','\'] then
            delete(hs,length(hs),1);
           {$I-}
            mkdir(hs);
           {$I+}
           if ioresult<>0 then;
         end;
      end;


    const
      lastas  : byte=255;
    var
      LastASBin : pathstr;
    Function TExternalAssembler.FindAssembler:string;
      var
        asfound : boolean;
        UtilExe  : string;
      begin
        asfound:=false;
        if cs_link_on_target in aktglobalswitches then
         begin
           { If linking on target, don't add any path PM }
           FindAssembler:=AddExtension(target_asm.asmbin,target_info.exeext);
           exit;
         end
        else
         UtilExe:=AddExtension(target_asm.asmbin,source_info.exeext);
        if lastas<>ord(target_asm.id) then
         begin
           lastas:=ord(target_asm.id);
           { is an assembler passed ? }
           if utilsdirectory<>'' then
             asfound:=FindFile(UtilExe,utilsdirectory,LastASBin);
           if not AsFound then
             asfound:=FindExe(UtilExe,LastASBin);
           if (not asfound) and not(cs_asm_extern in aktglobalswitches) then
            begin
              Message1(exec_e_assembler_not_found,LastASBin);
              aktglobalswitches:=aktglobalswitches+[cs_asm_extern];
            end;
           if asfound then
            Message1(exec_t_using_assembler,LastASBin);
         end;
        FindAssembler:=LastASBin;
      end;


    Function TExternalAssembler.CallAssembler(const command,para:string):Boolean;
      begin
        callassembler:=true;
        if not(cs_asm_extern in aktglobalswitches) then
         begin
           swapvectors;
           exec(command,para);
           swapvectors;
           if (doserror<>0) then
            begin
              Message1(exec_e_cant_call_assembler,tostr(doserror));
              aktglobalswitches:=aktglobalswitches+[cs_asm_extern];
              callassembler:=false;
            end
           else
            if (dosexitcode<>0) then
             begin
              Message1(exec_e_error_while_assembling,tostr(dosexitcode));
              callassembler:=false;
             end;
         end
        else
         AsmRes.AddAsmCommand(command,para,name);
      end;


    procedure TExternalAssembler.RemoveAsm;
      var
        g : file;
      begin
        if cs_asm_leave in aktglobalswitches then
         exit;
        if cs_asm_extern in aktglobalswitches then
         AsmRes.AddDeleteCommand(AsmFile)
        else
         begin
           assign(g,AsmFile);
           {$I-}
            erase(g);
           {$I+}
           if ioresult<>0 then;
         end;
      end;


    Function TExternalAssembler.DoAssemble:boolean;
      var
        s : string;
      begin
        DoAssemble:=true;
        if DoPipe then
         exit;
        if not(cs_asm_extern in aktglobalswitches) then
         begin
           if SmartAsm then
            begin
              if (SmartFilesCount<=1) then
               Message1(exec_i_assembling_smart,name);
            end
           else
           Message1(exec_i_assembling,name);
         end;
        s:=target_asm.asmcmd;
{$ifdef m68k}
        if aktoptprocessor = MC68020 then
          s:='-m68020 '+s
        else
          s:='-m68000 '+s;
{$endif}
        if (cs_link_on_target in aktglobalswitches) then
         begin
           Replace(s,'$ASM',ScriptFixFileName(AsmFile));
           Replace(s,'$OBJ',ScriptFixFileName(ObjFile));
         end
        else
         begin
           Replace(s,'$ASM',AsmFile);
           Replace(s,'$OBJ',ObjFile);
         end;
        if CallAssembler(FindAssembler,s) then
         RemoveAsm
        else
         begin
            DoAssemble:=false;
            GenerateError;
         end;
      end;


    Procedure TExternalAssembler.AsmFlush;
      begin
        if outcnt>0 then
         begin
           BlockWrite(outfile,outbuf,outcnt);
           outcnt:=0;
         end;
      end;


    Procedure TExternalAssembler.AsmClear;
      begin
        outcnt:=0;
      end;


    Procedure TExternalAssembler.AsmWrite(const s:string);
      begin
        if OutCnt+length(s)>=AsmOutSize then
         AsmFlush;
        Move(s[1],OutBuf[OutCnt],length(s));
        inc(OutCnt,length(s));
        inc(AsmSize,length(s));
      end;


    Procedure TExternalAssembler.AsmWriteLn(const s:string);
      begin
        AsmWrite(s);
        AsmLn;
      end;


    Procedure TExternalAssembler.AsmWritePChar(p:pchar);
      var
        i,j : longint;
      begin
        i:=StrLen(p);
        j:=i;
        while j>0 do
         begin
           i:=min(j,AsmOutSize);
           if OutCnt+i>=AsmOutSize then
            AsmFlush;
           Move(p[0],OutBuf[OutCnt],i);
           inc(OutCnt,i);
           inc(AsmSize,i);
           dec(j,i);
           p:=pchar(@p[i]);
         end;
      end;


    Procedure TExternalAssembler.AsmLn;
      begin
        if OutCnt>=AsmOutSize-2 then
         AsmFlush;
        OutBuf[OutCnt]:=target_info.newline[1];
        inc(OutCnt);
        inc(AsmSize);
        if length(target_info.newline)>1 then
         begin
           OutBuf[OutCnt]:=target_info.newline[2];
           inc(OutCnt);
           inc(AsmSize);
         end;
      end;


    procedure TExternalAssembler.AsmCreate(Aplace:tcutplace);
      begin
        if SmartAsm then
         NextSmartName(Aplace);
{$ifdef hasunix}
        if DoPipe then
         begin
           Message1(exec_i_assembling_pipe,asmfile);
           POpen(outfile,'as -o '+objfile,'W');
         end
        else
{$endif}
         begin
           Assign(outfile,asmfile);
           {$I-}
            Rewrite(outfile,1);
           {$I+}
           if ioresult<>0 then
            Message1(exec_d_cant_create_asmfile,asmfile);
         end;
        outcnt:=0;
        AsmSize:=0;
        AsmStartSize:=0;
      end;


    procedure TExternalAssembler.AsmClose;
      var
        f : file;
        l : longint;
      begin
        AsmFlush;
{$ifdef hasunix}
        if DoPipe then
         PClose(outfile)
        else
{$endif}
         begin
         {Touch Assembler time to ppu time is there is a ppufilename}
           if ppufilename<>'' then
            begin
              Assign(f,ppufilename);
              {$I-}
               reset(f,1);
              {$I+}
              if ioresult=0 then
               begin
                 getftime(f,l);
                 close(f);
                 reset(outfile,1);
                 setftime(outfile,l);
               end;
            end;
           close(outfile);
         end;
      end;


    procedure TExternalAssembler.WriteTree(p:TAAsmoutput);
      begin
      end;


    procedure TExternalAssembler.WriteAsmList;
      begin
      end;


    procedure TExternalAssembler.MakeObject;
      begin
        AsmCreate(cut_normal);
        WriteAsmList;
        AsmClose;
        DoAssemble;
      end;


{*****************************************************************************
                                  TInternalAssembler
*****************************************************************************}

    constructor TInternalAssembler.create(smart:boolean);
      begin
        inherited create(smart);
        objectoutput:=nil;
        objectdata:=nil;
        objectalloc:=TAsmObjectAlloc.create;
        SmartAsm:=smart;
        currpass:=0;
      end;


   destructor TInternalAssembler.destroy;
{$ifdef MEMDEBUG}
      var
        d : tmemdebug;
{$endif}
      begin
{$ifdef MEMDEBUG}
        d := tmemdebug.create(name+' - agbin');
{$endif}
        objectdata.free;
        objectoutput.free;
        objectalloc.free;
{$ifdef MEMDEBUG}
        d.free;
{$endif}
      end;


{$ifdef GDB}
    procedure TInternalAssembler.convertstabs(p:pchar);
      var
        ofs,
        nidx,nother,ii,i,line,j : longint;
        code : integer;
        hp : pchar;
        reloc : boolean;
        sec : TSection;
        ps : tasmsymbol;
        s : string;
      begin
        ofs:=0;
        reloc:=true;
        ps:=nil;
        sec:=sec_none;
        if p[0]='"' then
         begin
           i:=1;
           { we can have \" inside the string !! PM }
           while not ((p[i]='"') and (p[i-1]<>'\')) do
            inc(i);
           p[i]:=#0;
           ii:=i;
           hp:=@p[1];
           s:=StrPas(@P[i+2]);
         end
        else
         begin
           hp:=nil;
           s:=StrPas(P);
           i:=-2; {needed below (PM) }
         end;
      { When in pass 1 then only alloc and leave }
        if currpass=1 then
         begin
           objectalloc.staballoc(hp);
           if assigned(hp) then
            p[i]:='"';
           exit;
         end;
      { Parse the rest of the stabs }
        if s='' then
         internalerror(33000);
        j:=pos(',',s);
        if j=0 then
         internalerror(33001);
        Val(Copy(s,1,j-1),nidx,code);
        if code<>0 then
         internalerror(33002);
        i:=i+2+j;
        Delete(s,1,j);
        j:=pos(',',s);
        if (j=0) then
         internalerror(33003);
        Val(Copy(s,1,j-1),nother,code);
        if code<>0 then
         internalerror(33004);
        i:=i+j;
        Delete(s,1,j);
        j:=pos(',',s);
        if j=0 then
         begin
           j:=256;
           ofs:=-1;
         end;
        Val(Copy(s,1,j-1),line,code);
        if code<>0 then
          internalerror(33005);
        if ofs=0 then
          begin
            Delete(s,1,j);
            i:=i+j;
            Val(s,ofs,code);
            if code=0 then
              reloc:=false
            else
              begin
                ofs:=0;
                s:=strpas(@p[i]);
                { handle asmsymbol or
                    asmsymbol - asmsymbol }
                j:=pos(' ',s);
                if j=0 then
                  j:=pos('-',s);
                { single asmsymbol }
                if j=0 then
                  j:=256;
                { the symbol can be external
                  so we must use newasmsymbol and
                  not getasmsymbol !! PM }
                ps:=objectlibrary.newasmsymbol(copy(s,1,j-1));
                if not assigned(ps) then
                  internalerror(33006)
                else
                  begin
                    sec:=ps.section;
                    ofs:=ps.address;
                    reloc:=true;
                    objectlibrary.UsedAsmSymbolListInsert(ps);
                  end;
                if j<256 then
                  begin
                    i:=i+j;
                    s:=strpas(@p[i]);
                    if (s<>'') and (s[1]=' ') then
                      begin
                         j:=0;
                         while (s[j+1]=' ') do
                           inc(j);
                         i:=i+j;
                         s:=strpas(@p[i]);
                      end;
                    ps:=objectlibrary.getasmsymbol(s);
                    if not assigned(ps) then
                      internalerror(33007)
                    else
                      begin
                        if ps.section<>sec then
                          internalerror(33008);
                        ofs:=ofs-ps.address;
                        reloc:=false;
                        objectlibrary.UsedAsmSymbolListInsert(ps);
                      end;
                  end;
              end;
          end;
        { external bss need speical handling (PM) }
        if assigned(ps) and (ps.section=sec_none) then
          begin
            if currpass=2 then
              begin
                objectdata.writesymbol(ps);
                objectoutput.exportsymbol(ps);
              end;
            objectdata.writeSymStabs(sec,ofs,hp,ps,nidx,nother,line,reloc)
          end
        else
          objectdata.writeStabs(sec,ofs,hp,nidx,nother,line,reloc);
        if assigned(hp) then
         p[ii]:='"';
      end;


    procedure TInternalAssembler.emitlineinfostabs(nidx,line : longint);
      var
         sec : TSection;
      begin
        if currpass=1 then
          begin
            objectalloc.staballoc(nil);
            exit;
          end;

        if (nidx=n_textline) and assigned(funcname) and
           (target_info.use_function_relative_addresses) then
          objectdata.writeStabs(sec_code,objectdata.sectionsize(sec_code)-funcname.address,
              nil,nidx,0,line,false)
        else
          begin
            if nidx=n_textline then
              sec:=sec_code
            else if nidx=n_dataline then
              sec:=sec_data
            else
              sec:=sec_bss;
            objectdata.writeStabs(sec,objectdata.sectionsize(sec),
              nil,nidx,0,line,true);
          end;
      end;


    procedure TInternalAssembler.emitstabs(s:string);
      begin
        s:=s+#0;
        ConvertStabs(@s[1]);
      end;


    procedure TInternalAssembler.WriteFileLineInfo(var fileinfo : tfileposinfo);
      var
        curr_n : byte;
        hp : tasmsymbol;
        infile : tinputfile;
      begin
        if not ((cs_debuginfo in aktmoduleswitches) or
           (cs_gdb_lineinfo in aktglobalswitches)) then
         exit;

        { file changed ? (must be before line info) }
        if (fileinfo.fileindex<>0) and
           (stabslastfileinfo.fileindex<>fileinfo.fileindex) then
         begin
           infile:=current_module.sourcefiles.get_file(fileinfo.fileindex);
           if assigned(infile) then
            begin
              if includecount=0 then
               curr_n:=n_sourcefile
              else
               curr_n:=n_includefile;
              { get symbol for this includefile }
              hp:=objectlibrary.newasmsymboltype('Ltext'+ToStr(IncludeCount),AB_LOCAL,AT_FUNCTION);
              if currpass=1 then
                begin
                  hp.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
                  objectlibrary.UsedAsmSymbolListInsert(hp);
                end
              else
                objectdata.writesymbol(hp);
              { emit stabs }
              if (infile.path^<>'') then
                EmitStabs('"'+lower(BsToSlash(FixPath(infile.path^,false)))+'",'+tostr(curr_n)+
                          ',0,0,Ltext'+ToStr(IncludeCount));
              EmitStabs('"'+lower(FixFileName(infile.name^))+'",'+tostr(curr_n)+
                        ',0,0,Ltext'+ToStr(IncludeCount));
              inc(includecount);
              { force new line info }
              stabslastfileinfo.line:=-1;
            end;
         end;

        { line changed ? }
        if (stabslastfileinfo.line<>fileinfo.line) and (fileinfo.line<>0) then
          emitlineinfostabs(n_line,fileinfo.line);
        stabslastfileinfo:=fileinfo;
      end;


    procedure TInternalAssembler.StartFileLineInfo;
      var
        fileinfo : tfileposinfo;
      begin
        FillChar(stabslastfileinfo,sizeof(stabslastfileinfo),0);
        n_line:=n_textline;
        funcname:=nil;
        linecount:=1;
        includecount:=0;
        fileinfo.fileindex:=1;
        fileinfo.line:=1;
        WriteFileLineInfo(fileinfo);
      end;


    procedure TInternalAssembler.EndFileLineInfo;
      var
        hp : tasmsymbol;
        store_sec : TSection;
      begin
          if not ((cs_debuginfo in aktmoduleswitches) or
             (cs_gdb_lineinfo in aktglobalswitches)) then
           exit;
        store_sec:=objectalloc.currsec;
        objectalloc.seTSection(sec_code);
        hp:=objectlibrary.newasmsymboltype('Letext',AB_LOCAL,AT_FUNCTION);
        if currpass=1 then
          begin
            hp.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
            objectlibrary.UsedAsmSymbolListInsert(hp);
          end
        else
          objectdata.writesymbol(hp);
        EmitStabs('"",'+tostr(n_sourcefile)+',0,0,Letext');
        objectalloc.seTSection(store_sec);
      end;
{$endif GDB}


    function TInternalAssembler.MaybeNextList(var hp:Tai):boolean;
      begin
        { maybe end of list }
        while not assigned(hp) do
         begin
           if currlistidx<lists then
            begin
              inc(currlistidx);
              currlist:=list[currlistidx];
              hp:=Tai(currList.first);
            end
           else
            begin
              MaybeNextList:=false;
              exit;
            end;
         end;
        MaybeNextList:=true;
      end;


    function TInternalAssembler.TreePass0(hp:Tai):Tai;
      var
        l : longint;
      begin
        while assigned(hp) do
         begin
           case hp.typ of
             ait_align :
               begin
                 { always use the maximum fillsize in this pass to avoid possible
                   short jumps to become out of range }
                 Tai_align(hp).fillsize:=Tai_align(hp).aligntype;
                 objectalloc.sectionalloc(Tai_align(hp).fillsize);
               end;
             ait_datablock :
               begin
                 if not SmartAsm then
                  begin
                    if not Tai_datablock(hp).is_global then
                     begin
                        l:=Tai_datablock(hp).size;
                        if l>2 then
                          objectalloc.sectionalign(4)
                        else if l>1 then
                          objectalloc.sectionalign(2);
                        objectalloc.sectionalloc(Tai_datablock(hp).size);
                     end;
                  end
                 else
                  begin
                    l:=Tai_datablock(hp).size;
                    if l>2 then
                      objectalloc.sectionalign(4)
                    else if l>1 then
                      objectalloc.sectionalign(2);
                    objectalloc.sectionalloc(Tai_datablock(hp).size);
                  end;
               end;
             ait_const_32bit :
               objectalloc.sectionalloc(4);
             ait_const_16bit :
               objectalloc.sectionalloc(2);
             ait_const_8bit :
               objectalloc.sectionalloc(1);
             ait_real_80bit :
               objectalloc.sectionalloc(10);
             ait_real_64bit :
               objectalloc.sectionalloc(8);
             ait_real_32bit :
               objectalloc.sectionalloc(4);
             ait_comp_64bit :
               objectalloc.sectionalloc(8);
             ait_const_rva,
             ait_const_symbol :
               objectalloc.sectionalloc(4);
             ait_section:
               objectalloc.seTSection(Tai_section(hp).sec);
             ait_symbol :
               Tai_symbol(hp).sym.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
             ait_label :
               Tai_label(hp).l.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
             ait_string :
               objectalloc.sectionalloc(Tai_string(hp).len);
             ait_instruction :
               begin
{$ifdef i386}
{$ifndef NOAG386BIN}
                 { reset instructions which could change in pass 2 }
                 Taicpu(hp).resetpass2;
                 objectalloc.sectionalloc(Taicpu(hp).Pass1(objectalloc.sectionsize));
{$endif NOAG386BIN}
{$endif i386}
               end;
             ait_cut :
               if SmartAsm then
                break;
           end;
           hp:=Tai(hp.next);
         end;
        TreePass0:=hp;
      end;


    function TInternalAssembler.TreePass1(hp:Tai):Tai;
      var
        InlineLevel,
        i,l : longint;
      begin
        inlinelevel:=0;
        while assigned(hp) do
         begin
{$ifdef GDB}
           { write stabs, no line info for inlined code }
           if (inlinelevel=0) and
              ((cs_debuginfo in aktmoduleswitches) or
               (cs_gdb_lineinfo in aktglobalswitches)) then
            begin
              if (objectalloc.currsec<>sec_none) and
                 not(hp.typ in SkipLineInfo) then
               WriteFileLineInfo(tailineinfo(hp).fileinfo);
            end;
{$endif GDB}
           case hp.typ of
             ait_align :
               begin
                 { here we must determine the fillsize which is used in pass2 }
                 Tai_align(hp).fillsize:=align(objectalloc.sectionsize,Tai_align(hp).aligntype)-
                   objectalloc.sectionsize;
                 objectalloc.sectionalloc(Tai_align(hp).fillsize);
               end;
             ait_datablock :
               begin
                 if objectalloc.currsec<>sec_bss then
                  Message(asmw_e_alloc_data_only_in_bss);
                 if not SmartAsm then
                  begin
                    if Tai_datablock(hp).is_global then
                     begin
                       Tai_datablock(hp).sym.setaddress(currpass,sec_none,Tai_datablock(hp).size,Tai_datablock(hp).size);
                       { force to be common/external, must be after setaddress as that would
                         set it to AS_GLOBAL }
                       Tai_datablock(hp).sym.currbind:=AB_COMMON;
                     end
                    else
                     begin
                       l:=Tai_datablock(hp).size;
                       if l>2 then
                         objectalloc.sectionalign(4)
                       else if l>1 then
                         objectalloc.sectionalign(2);
                       Tai_datablock(hp).sym.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,
                         Tai_datablock(hp).size);
                       objectalloc.sectionalloc(Tai_datablock(hp).size);
                     end;
                   end
                  else
                   begin
                     l:=Tai_datablock(hp).size;
                     if l>2 then
                       objectalloc.sectionalign(4)
                     else if l>1 then
                       objectalloc.sectionalign(2);
                     Tai_datablock(hp).sym.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,Tai_datablock(hp).size);
                     objectalloc.sectionalloc(Tai_datablock(hp).size);
                   end;
                 objectlibrary.UsedAsmSymbolListInsert(Tai_datablock(hp).sym);
               end;
             ait_const_32bit :
               objectalloc.sectionalloc(4);
             ait_const_16bit :
               objectalloc.sectionalloc(2);
             ait_const_8bit :
               objectalloc.sectionalloc(1);
             ait_real_80bit :
               objectalloc.sectionalloc(10);
             ait_real_64bit :
               objectalloc.sectionalloc(8);
             ait_real_32bit :
               objectalloc.sectionalloc(4);
             ait_comp_64bit :
               objectalloc.sectionalloc(8);
             ait_const_rva,
             ait_const_symbol :
               begin
                 objectalloc.sectionalloc(4);
                 objectlibrary.UsedAsmSymbolListInsert(Tai_const_symbol(hp).sym);
               end;
             ait_section:
               begin
                 objectalloc.seTSection(Tai_section(hp).sec);
{$ifdef GDB}
                 case Tai_section(hp).sec of
                  sec_code : n_line:=n_textline;
                  sec_data : n_line:=n_dataline;
                   sec_bss : n_line:=n_bssline;
                 else
                  n_line:=n_dataline;
                 end;
                 stabslastfileinfo.line:=-1;
{$endif GDB}
               end;
{$ifdef GDB}
             ait_stabn :
               convertstabs(Tai_stabn(hp).str);
             ait_stabs :
               convertstabs(Tai_stabs(hp).str);
             ait_stab_function_name :
               begin
                 if assigned(Tai_stab_function_name(hp).str) then
                  begin
                    funcname:=objectlibrary.getasmsymbol(strpas(Tai_stab_function_name(hp).str));
                    objectlibrary.UsedAsmSymbolListInsert(funcname);
                  end
                 else
                  funcname:=nil;
               end;
             ait_force_line :
               stabslastfileinfo.line:=0;
{$endif}
             ait_symbol :
               begin
                 Tai_symbol(hp).sym.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
                 objectlibrary.UsedAsmSymbolListInsert(Tai_symbol(hp).sym);
               end;
             ait_symbol_end :
               begin
                 if target_info.system in [system_i386_linux,system_i386_beos] then
                  begin
                    Tai_symbol_end(hp).sym.size:=objectalloc.sectionsize-Tai_symbol_end(hp).sym.address;
                    objectlibrary.UsedAsmSymbolListInsert(Tai_symbol_end(hp).sym);
                  end;
                end;
             ait_label :
               begin
                 Tai_label(hp).l.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
                 objectlibrary.UsedAsmSymbolListInsert(Tai_label(hp).l);
               end;
             ait_string :
               objectalloc.sectionalloc(Tai_string(hp).len);
             ait_instruction :
               begin
{$ifdef i386}
{$ifndef NOAG386BIN}
                 objectalloc.sectionalloc(Taicpu(hp).Pass1(objectalloc.sectionsize));
                 { fixup the references }
                 for i:=1 to Taicpu(hp).ops do
                  begin
                    with Taicpu(hp).oper[i-1] do
                     begin
                       case typ of
                         top_ref :
                           begin
                             if assigned(ref^.symbol) then
                              objectlibrary.UsedAsmSymbolListInsert(ref^.symbol);
                           end;
                         top_symbol :
                           begin
                             objectlibrary.UsedAsmSymbolListInsert(sym);
                           end;
                       end;
                     end;
                  end;
{$endif NOAG386BIN}
{$endif i386}
               end;
             ait_direct :
               Message(asmw_f_direct_not_supported);
             ait_cut :
               if SmartAsm then
                break;
             ait_marker :
               if tai_marker(hp).kind=InlineStart then
                 inc(InlineLevel)
               else if tai_marker(hp).kind=InlineEnd then
                 dec(InlineLevel);
           end;
           hp:=Tai(hp.next);
         end;
        TreePass1:=hp;
      end;


    function TInternalAssembler.TreePass2(hp:Tai):Tai;
      var
        fillbuffer : tfillbuffer;
        InlineLevel,
        l  : longint;
{$ifdef i386}
        co : comp;
{$endif i386}
      begin
        inlinelevel:=0;
        { main loop }
        while assigned(hp) do
         begin
{$ifdef GDB}
           { write stabs, no line info for inlined code }
           if (inlinelevel=0) and
              ((cs_debuginfo in aktmoduleswitches) or
               (cs_gdb_lineinfo in aktglobalswitches)) then
            begin
              if (objectdata.currsec<>sec_none) and
                 not(hp.typ in SkipLineInfo) then
               WriteFileLineInfo(tailineinfo(hp).fileinfo);
            end;
{$endif GDB}
           case hp.typ of
             ait_align :
               begin
                 if objectdata.currsec=sec_bss then
                   objectdata.alloc(Tai_align(hp).fillsize)
                 else
                   objectdata.writebytes(Tai_align(hp).calculatefillbuf(fillbuffer)^,Tai_align(hp).fillsize);
               end;
             ait_section :
               begin
                 objectdata.defaulTSection(Tai_section(hp).sec);
{$ifdef GDB}
                 case Tai_section(hp).sec of
                  sec_code : n_line:=n_textline;
                  sec_data : n_line:=n_dataline;
                   sec_bss : n_line:=n_bssline;
                 else
                  n_line:=n_dataline;
                 end;
                 stabslastfileinfo.line:=-1;
{$endif GDB}
               end;
             ait_symbol :
               begin
                 objectdata.writesymbol(Tai_symbol(hp).sym);
                 objectoutput.exportsymbol(Tai_symbol(hp).sym);
               end;
             ait_datablock :
               begin
                 objectdata.writesymbol(Tai_datablock(hp).sym);
                 objectoutput.exportsymbol(Tai_datablock(hp).sym);
                 if SmartAsm or (not Tai_datablock(hp).is_global) then
                   begin
                     l:=Tai_datablock(hp).size;
                     if l>2 then
                       objectdata.allocalign(4)
                     else if l>1 then
                       objectdata.allocalign(2);
                     objectdata.alloc(Tai_datablock(hp).size);
                   end;
               end;
             ait_const_32bit :
               objectdata.writebytes(Tai_const(hp).value,4);
             ait_const_16bit :
               objectdata.writebytes(Tai_const(hp).value,2);
             ait_const_8bit :
               objectdata.writebytes(Tai_const(hp).value,1);
             ait_real_80bit :
               objectdata.writebytes(Tai_real_80bit(hp).value,10);
             ait_real_64bit :
               objectdata.writebytes(Tai_real_64bit(hp).value,8);
             ait_real_32bit :
               objectdata.writebytes(Tai_real_32bit(hp).value,4);
             ait_comp_64bit :
               begin
{$ifdef i386}
{$ifdef FPC}
                 co:=comp(Tai_comp_64bit(hp).value);
{$else}
                 co:=Tai_comp_64bit(hp).value;
{$endif}
                 objectdata.writebytes(co,8);
{$endif i386}
               end;
             ait_string :
               objectdata.writebytes(Tai_string(hp).str^,Tai_string(hp).len);
             ait_const_rva :
               objectdata.writereloc(Tai_const_symbol(hp).offset,4,
                 Tai_const_symbol(hp).sym,RELOC_RVA);
             ait_const_symbol :
               objectdata.writereloc(Tai_const_symbol(hp).offset,4,
                 Tai_const_symbol(hp).sym,RELOC_ABSOLUTE);
             ait_label :
               begin
                 objectdata.writesymbol(Tai_label(hp).l);
                 { exporting shouldn't be necessary as labels are local,
                   but it's better to be on the safe side (PFV) }
                 objectoutput.exportsymbol(Tai_label(hp).l);
               end;
{$ifdef i386}
{$ifndef NOAG386BIN}
             ait_instruction :
               Taicpu(hp).Pass2(objectdata);
{$endif NOAG386BIN}
{$endif i386}
{$ifdef GDB}
             ait_stabn :
               convertstabs(Tai_stabn(hp).str);
             ait_stabs :
               convertstabs(Tai_stabs(hp).str);
             ait_stab_function_name :
               if assigned(Tai_stab_function_name(hp).str) then
                 funcname:=objectlibrary.getasmsymbol(strpas(Tai_stab_function_name(hp).str))
               else
                 funcname:=nil;
             ait_force_line :
               stabslastfileinfo.line:=0;
{$endif}
             ait_cut :
               if SmartAsm then
                break;
             ait_marker :
               if tai_marker(hp).kind=InlineStart then
                 inc(InlineLevel)
               else if tai_marker(hp).kind=InlineEnd then
                 dec(InlineLevel);
           end;
           hp:=Tai(hp.next);
         end;
        TreePass2:=hp;
      end;


    procedure TInternalAssembler.writetree;
      var
        hp : Tai;
      label
        doexit;
      begin
        objectalloc.reseTSections;
        objectalloc.seTSection(sec_code);

        objectdata:=objectoutput.newobjectdata(Objfile);
        objectdata.defaulTSection(sec_code);
        { reset the asmsymbol list }
        objectlibrary.CreateUsedAsmsymbolList;

      { Pass 0 }
        currpass:=0;
        objectalloc.seTSection(sec_code);
        { start with list 1 }
        currlistidx:=1;
        currlist:=list[currlistidx];
        hp:=Tai(currList.first);
        while assigned(hp) do
         begin
           hp:=TreePass0(hp);
           MaybeNextList(hp);
         end;
        { leave if errors have occured }
        if errorcount>0 then
         goto doexit;

      { Pass 1 }
        currpass:=1;
        objectalloc.reseTSections;
        objectalloc.seTSection(sec_code);
{$ifdef GDB}
        StartFileLineInfo;
{$endif GDB}
        { start with list 1 }
        currlistidx:=1;
        currlist:=list[currlistidx];
        hp:=Tai(currList.first);
        while assigned(hp) do
         begin
           hp:=TreePass1(hp);
           MaybeNextList(hp);
         end;
{$ifdef GDB}
        EndFileLineInfo;
{$endif GDB}
        { check for undefined labels and reset }
        objectlibrary.UsedAsmSymbolListCheckUndefined;

        { set section sizes }
        objectdata.seTSectionsizes(objectalloc.secsize);
        { leave if errors have occured }
        if errorcount>0 then
         goto doexit;

      { Pass 2 }
        currpass:=2;
{$ifdef GDB}
        StartFileLineInfo;
{$endif GDB}
        { start with list 1 }
        currlistidx:=1;
        currlist:=list[currlistidx];
        hp:=Tai(currList.first);
        while assigned(hp) do
         begin
           hp:=TreePass2(hp);
           MaybeNextList(hp);
         end;
{$ifdef GDB}
        EndFileLineInfo;
{$endif GDB}

        { don't write the .o file if errors have occured }
        if errorcount=0 then
         begin
           { write objectfile }
           objectoutput.startobjectfile(ObjFile);
           objectoutput.writeobjectfile(objectdata);
           objectdata.free;
           objectdata:=nil;
         end;

      doexit:
        { reset the used symbols back, must be after the .o has been
          written }
        objectlibrary.UsedAsmsymbolListReset;
        objectlibrary.DestroyUsedAsmsymbolList;
      end;


    procedure TInternalAssembler.writetreesmart;
      var
        hp : Tai;
        starTSec : TSection;
        place: tcutplace;
      begin
        objectalloc.reseTSections;
        objectalloc.seTSection(sec_code);

        NextSmartName(cut_normal);
        objectdata:=objectoutput.newobjectdata(Objfile);
        objectdata.defaulTSection(sec_code);
        starTSec:=sec_code;

        { start with list 1 }
        currlistidx:=1;
        currlist:=list[currlistidx];
        hp:=Tai(currList.first);
        while assigned(hp) do
         begin
         { reset the asmsymbol list }
           objectlibrary.CreateUsedAsmSymbolList;

         { Pass 0 }
           currpass:=0;
           objectalloc.reseTSections;
           objectalloc.seTSection(starTSec);
           TreePass0(hp);
           { leave if errors have occured }
           if errorcount>0 then
            exit;

         { Pass 1 }
           currpass:=1;
           objectalloc.reseTSections;
           objectalloc.seTSection(starTSec);
{$ifdef GDB}
           StartFileLineInfo;
{$endif GDB}
           TreePass1(hp);
{$ifdef GDB}
           EndFileLineInfo;
{$endif GDB}
           { check for undefined labels }
           objectlibrary.UsedAsmSymbolListCheckUndefined;

           { set section sizes }
           objectdata.seTSectionsizes(objectalloc.secsize);
           { leave if errors have occured }
           if errorcount>0 then
            exit;

         { Pass 2 }
           currpass:=2;
           objectoutput.startobjectfile(Objfile);
           objectdata.defaulTSection(starTSec);
{$ifdef GDB}
           StartFileLineInfo;
{$endif GDB}
           hp:=TreePass2(hp);
{$ifdef GDB}
           EndFileLineInfo;
{$endif GDB}
           { leave if errors have occured }
           if errorcount>0 then
            exit;

           { write the current objectfile }
           objectoutput.writeobjectfile(objectdata);
           objectdata.free;
           objectdata:=nil;

           { reset the used symbols back, must be after the .o has been
             written }
           objectlibrary.UsedAsmsymbolListReset;
           objectlibrary.DestroyUsedAsmsymbolList;

           { end of lists? }
           if not MaybeNextList(hp) then
            break;

           { save section for next loop }
           { this leads to a problem if starTSec is sec_none !! PM }
           starTSec:=objectalloc.currsec;

           { we will start a new objectfile so reset everything }
           { The place can still change in the next while loop, so don't init }
           { the writer yet (JM)                                              }
           if (hp.typ=ait_cut) then
            place := Tai_cut(hp).place
           else
            place := cut_normal;

           { avoid empty files }
           while assigned(hp) and
                 (Tai(hp).typ in [ait_marker,ait_comment,ait_section,ait_cut]) do
            begin
              if Tai(hp).typ=ait_section then
               starTSec:=Tai_section(hp).sec
              else if (Tai(hp).typ=ait_cut) then
               place := Tai_cut(hp).place;
              hp:=Tai(hp.next);
            end;

           if not MaybeNextList(hp) then
             break;

           { start next objectfile }
           NextSmartName(place);
           objectdata:=objectoutput.newobjectdata(Objfile);

           { there is a problem if starTSec is sec_none !! PM }
           if starTSec=sec_none then
             starTSec:=sec_code;

         end;
      end;


    procedure TInternalAssembler.MakeObject;

        procedure addlist(p:TAAsmoutput);
        begin
          inc(lists);
          list[lists]:=p;
        end;

      begin
        if cs_debuginfo in aktmoduleswitches then
          addlist(debuglist);
        addlist(codesegment);
        addlist(datasegment);
        addlist(consts);
        addlist(rttilist);
        if assigned(resourcestringlist) then
          addlist(resourcestringlist);
        addlist(bsssegment);
        if assigned(importssection) then
          addlist(importssection);
        if assigned(exportssection) and not UseDeffileForExport then
          addlist(exportssection);
        if assigned(resourcesection) then
          addlist(resourcesection);

        if SmartAsm then
          writetreesmart
        else
          writetree;
      end;


{*****************************************************************************
                     Generate Assembler Files Main Procedure
*****************************************************************************}

    Procedure GenerateAsm(smart:boolean);
      var
        a : TAssembler;
      begin
        if not assigned(CAssembler[target_asm.id]) then
          Message(asmw_f_assembler_output_not_supported);
        a:=CAssembler[target_asm.id].Create(smart);
        a.MakeObject;
        a.Free;
      end;


    Procedure OnlyAsm;
      var
        a : TExternalAssembler;
      begin
        a:=TExternalAssembler.Create(false);
        a.DoAssemble;
        a.Free;
      end;


{*****************************************************************************
                                 Init/Done
*****************************************************************************}

    procedure RegisterAssembler(const r:tasminfo;c:TAssemblerClass);
      var
        t : tasm;
      begin
        t:=r.id;
        if assigned(asminfos[t]) then
          writeln('Warning: Assembler is already registered!')
        else
          Getmem(asminfos[t],sizeof(tasminfo));
        asminfos[t]^:=r;
        CAssembler[t]:=c;
      end;


    procedure InitAssembler;
      begin
        { target_asm is already set by readarguments }
        initoutputformat:=target_asm.id;
        aktoutputformat:=target_asm.id;
      end;


    procedure DoneAssembler;
      begin
      end;

end.
{
  $Log$
  Revision 1.52  2003-04-23 13:48:07  peter
    * m68k fix

  Revision 1.51  2003/04/22 14:33:38  peter
    * removed some notes/hints

  Revision 1.50  2003/03/10 18:16:00  olle
    * niceified comments

  Revision 1.49  2003/01/10 21:49:00  marco
   * more hasunix fixes

  Revision 1.48  2002/11/24 18:21:49  carl
    - remove some unused defines

  Revision 1.47  2002/11/17 16:31:55  carl
    * memory optimization (3-4%) : cleanup of tai fields,
       cleanup of tdef and tsym fields.
    * make it work for m68k

  Revision 1.46  2002/11/15 01:58:46  peter
    * merged changes from 1.0.7 up to 04-11
      - -V option for generating bug report tracing
      - more tracing for option parsing
      - errors for cdecl and high()
      - win32 import stabs
      - win32 records<=8 are returned in eax:edx (turned off by default)
      - heaptrc update
      - more info for temp management in .s file with EXTDEBUG

  Revision 1.45  2002/10/30 21:01:14  peter
    * always include lineno after fileswitch. valgrind requires this

  Revision 1.44  2002/09/05 19:29:42  peter
    * memdebug enhancements

  Revision 1.43  2002/08/20 16:55:38  peter
    * don't write (stabs)line info when inlining a procedure

  Revision 1.42  2002/08/12 15:08:39  carl
    + stab register indexes for powerpc (moved from gdb to cpubase)
    + tprocessor enumeration moved to cpuinfo
    + linker in target_info is now a class
    * many many updates for m68k (will soon start to compile)
    - removed some ifdef or correct them for correct cpu

  Revision 1.41  2002/08/11 14:32:26  peter
    * renamed current_library to objectlibrary

  Revision 1.40  2002/08/11 13:24:10  peter
    * saving of asmsymbols in ppu supported
    * asmsymbollist global is removed and moved into a new class
      tasmlibrarydata that will hold the info of a .a file which
      corresponds with a single module. Added librarydata to tmodule
      to keep the library info stored for the module. In the future the
      objectfiles will also be stored to the tasmlibrarydata class
    * all getlabel/newasmsymbol and friends are moved to the new class

  Revision 1.39  2002/07/26 21:15:37  florian
    * rewrote the system handling

  Revision 1.38  2002/07/10 07:24:40  jonas
    * memory leak fixes from Sergey Korshunoff

  Revision 1.37  2002/07/01 18:46:21  peter
    * internal linker
    * reorganized aasm layer

  Revision 1.36  2002/05/18 13:34:05  peter
    * readded missing revisions

  Revision 1.35  2002/05/16 19:46:35  carl
  + defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
  + try to fix temp allocation (still in ifdef)
  + generic constructor calls
  + start of tassembler / tmodulebase class cleanup

  Revision 1.33  2002/04/10 08:07:55  jonas
    * fix for the ie9999 under Linux (patch from Peter)

  Revision 1.32  2002/04/07 13:19:14  carl
  + more documentation

  Revision 1.31  2002/04/04 19:05:54  peter
    * removed unused units
    * use tlocation.size in cg.a_*loc*() routines

  Revision 1.30  2002/04/02 17:11:27  peter
    * tlocation,treference update
    * LOC_CONSTANT added for better constant handling
    * secondadd splitted in multiple routines
    * location_force_reg added for loading a location to a register
      of a specified size
    * secondassignment parses now first the right and then the left node
      (this is compatible with Kylix). This saves a lot of push/pop especially
      with string operations
    * adapted some routines to use the new cg methods

}