freepascal.compiler/compiler/assemble.pas

{
    $Id$
    Copyright (c) 1998-2000 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

{ Use multiple passes in the internal assembler to optimize jumps }
{$define MULTIPASS}


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

    const
       AsmOutSize=32768;

    type
      TAssembler=class
      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 the 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  : tobjectalloc;
        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
{$ifdef unix}
  {$ifdef ver1_0}
      linux,
  {$else}
      unix,
  {$endif}
{$endif}
      cutils,script,fmodule,verbose,
{$ifdef memdebug}
      cclasses,
{$endif memdebug}
{$ifdef GDB}
      finput,
      gdb,
{$endif GDB}
      cpubase,cpuasm
      ;

    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)
{$ifdef i386}
                and ((aktoutputformat=as_i386_as));
{$endif i386}
{$ifdef m68k}
                and ((aktoutputformat=as_m68k_as) or
                     (aktoutputformat=as_m68k_asbsd));
{$endif m68k}
      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;
        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);
      {$ifdef unix}
        if DoPipe then
         begin
           Message1(exec_i_assembling_pipe,asmfile);
           POpen(outfile,'as -o '+objfile,'W');
         end
        else
      {$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;
      {$ifdef unix}
        if DoPipe then
         PClose(outfile)
        else
      {$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;
        objectalloc:=tobjectalloc.create;
        SmartAsm:=smart;
        currpass:=0;
      end;


   destructor TInternalAssembler.destroy;
{$ifdef MEMDEBUG}
      var
        d : tmemdebug;
{$endif}
      begin
{$ifdef MEMDEBUG}
         d := tmemdebug.create('agbin');
{$endif}
        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:=newasmsymbol(copy(s,1,j-1));
                if not assigned(ps) then
                  internalerror(33006)
                else
                  begin
                    sec:=ps.section;
                    ofs:=ps.address;
                    reloc:=true;
                    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:=getasmsymbol(s);
                    if not assigned(ps) then
                      internalerror(33007)
                    else
                      begin
                        if ps.section<>sec then
                          internalerror(33008);
                        ofs:=ofs-ps.address;
                        reloc:=false;
                        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 includecount=0 then
            curr_n:=n_sourcefile
           else
            curr_n:=n_includefile;
           { get symbol for this includefile }
           hp:=newasmsymboltype('Ltext'+ToStr(IncludeCount),AB_LOCAL,AT_FUNCTION);
           if currpass=1 then
             begin
                hp.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
                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);
         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:=newasmsymboltype('Letext',AB_LOCAL,AT_FUNCTION);
        if currpass=1 then
          begin
            hp.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
            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
        i,l : longint;
      begin
        while assigned(hp) do
         begin
{$ifdef GDB}
           { write stabs }
          if ((cs_debuginfo in aktmoduleswitches) or
             (cs_gdb_lineinfo in aktglobalswitches)) then
            begin
              if (objectalloc.currsec<>sec_none) and
                 not(hp.typ in  [
                     ait_label,
                     ait_regalloc,ait_tempalloc,
                     ait_stabn,ait_stabs,ait_section,
                     ait_cut,ait_marker,ait_align,ait_stab_function_name]) then
               WriteFileLineInfo(hp.fileinfo);
            end;
{$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.bind:=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;
                 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);
                 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;
{$ifdef GDB}
             ait_stabn :
               convertstabs(Tai_stabn(hp).str);
             ait_stabs :
               convertstabs(Tai_stabs(hp).str);
             ait_stab_function_name :
               begin
                 if assigned(Tai_stab_function_name(hp).str) then
                  begin
                    funcname:=getasmsymbol(strpas(Tai_stab_function_name(hp).str));
                    UsedAsmSymbolListInsert(funcname);
                  end
                 else
                  funcname:=nil;
               end;
             ait_force_line :
               stabslastfileinfo.line:=0;
{$endif}
             ait_symbol :
               begin
                 Tai_symbol(hp).sym.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
                 UsedAsmSymbolListInsert(Tai_symbol(hp).sym);
               end;
             ait_symbol_end :
               begin
                 if target_info.target in [target_i386_linux,target_i386_beos] then
                  begin
                    Tai_symbol_end(hp).sym.size:=objectalloc.sectionsize-Tai_symbol_end(hp).sym.address;
                    UsedAsmSymbolListInsert(Tai_symbol_end(hp).sym);
                  end;
                end;
             ait_label :
               begin
                 Tai_label(hp).l.setaddress(currpass,objectalloc.currsec,objectalloc.sectionsize,0);
                 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
                              UsedAsmSymbolListInsert(ref^.symbol);
                           end;
                         top_symbol :
                           begin
                             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;
           end;
           hp:=Tai(hp.next);
         end;
        TreePass1:=hp;
      end;


    function TInternalAssembler.TreePass2(hp:Tai):Tai;
      var
        l  : longint;
{$ifdef i386}
        co : comp;
{$endif i386}
      begin
        { main loop }
        while assigned(hp) do
         begin
{$ifdef GDB}
           { write stabs }
          if ((cs_debuginfo in aktmoduleswitches) or
             (cs_gdb_lineinfo in aktglobalswitches)) then
            begin
              if (objectdata.currsec<>sec_none) and
                 not(hp.typ in [
                     ait_label,
                     ait_regalloc,ait_tempalloc,
                     ait_stabn,ait_stabs,ait_section,
                     ait_cut,ait_marker,ait_align,ait_stab_function_name]) then
               WriteFileLineInfo(hp.fileinfo);
            end;
{$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).getfillbuf^,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);
{$endif i386}
               end;
             ait_string :
               objectdata.writebytes(Tai_string(hp).str^,Tai_string(hp).len);
             ait_const_rva :
               objectdata.writereloc(Tai_const_symbol(hp).offset,4,
                 Tai_const_symbol(hp).sym,relative_rva);
             ait_const_symbol :
               objectdata.writereloc(Tai_const_symbol(hp).offset,4,
                 Tai_const_symbol(hp).sym,relative_false);
             ait_label :
               begin
                 objectdata.writesymbol(Tai_label(hp).l);
                 { exporting shouldn't be necessary as labels are local,
                   but it's better to be on the safe side (PFV) }
                 objectoutput.exportsymbol(Tai_label(hp).l);
               end;
{$ifdef i386}
{$ifndef NOAG386BIN}
             ait_instruction :
               Taicpu(hp).Pass2;
{$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:=getasmsymbol(strpas(Tai_stab_function_name(hp).str))
               else
                 funcname:=nil;
             ait_force_line :
               stabslastfileinfo.line:=0;
{$endif}
             ait_cut :
               if SmartAsm then
                break;
           end;
           hp:=Tai(hp.next);
         end;
        TreePass2:=hp;
      end;


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

        objectoutput.initwriting(ObjFile);
        objectdata:=objectoutput.data;
        objectdata.defaultsection(sec_code);
      { reset the asmsymbol list }
        CreateUsedAsmsymbolList;

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

      { 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 }
        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}

        { leave if errors have occured }
        if errorcount>0 then
         goto doexit;

        { write last objectfile }
        objectoutput.donewriting;
        objectdata:=nil;

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


    procedure TInternalAssembler.writetreesmart;
      var
        hp : Tai;
        startsec : tsection;
        place: tcutplace;
      begin
        objectalloc.resetsections;
        objectalloc.setsection(sec_code);

        NextSmartName(cut_normal);
        objectoutput.initwriting(ObjFile);
        objectdata:=objectoutput.data;
        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 }
           CreateUsedAsmSymbolList;

{$ifdef MULTIPASS}
         { Pass 0 }
           currpass:=0;
           objectalloc.resetsections;
           objectalloc.setsection(startsec);
           TreePass0(hp);
           { leave if errors have occured }
           if errorcount>0 then
            exit;
{$endif MULTIPASS}

         { 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 }
           UsedAsmSymbolListCheckUndefined;

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

         { Pass 2 }
           currpass:=2;
           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;

           { if not end then write the current objectfile }
           objectoutput.donewriting;
           objectdata:=nil;

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

           NextSmartName(place);
           objectoutput.initwriting(ObjFile);
           objectdata:=objectoutput.data;

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

           if not MaybeNextList(hp) then
             break;
         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 1.35  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

  Revision 1.29  2001/11/06 14:53:48  jonas
    * compiles again with -dmemdebug

  Revision 1.28  2001/09/18 11:30:47  michael
  * Fixes win32 linking problems with import libraries
  * LINKLIB Libraries are now looked for using C file extensions
  * get_exepath fix

  Revision 1.27  2001/09/17 21:29:10  peter
    * merged netbsd, fpu-overflow from fixes branch

  Revision 1.26  2001/08/30 20:57:09  peter
    * asbsd merged

  Revision 1.25  2001/08/30 19:43:50  peter
    * detect duplicate labels

  Revision 1.24  2001/08/26 13:36:35  florian
    * some cg reorganisation
    * some PPC updates

  Revision 1.23  2001/08/07 18:47:12  peter
    * merged netbsd start
    * profile for win32

  Revision 1.22  2001/07/01 20:16:15  peter
    * alignmentinfo record added
    * -Oa argument supports more alignment settings that can be specified
      per type: PROC,LOOP,VARMIN,VARMAX,CONSTMIN,CONSTMAX,RECORDMIN
      RECORDMAX,LOCALMIN,LOCALMAX. It is possible to set the mimimum
      required alignment and the maximum usefull alignment. The final
      alignment will be choosen per variable size dependent on these
      settings

  Revision 1.21  2001/06/18 20:36:23  peter
    * -Ur switch (merged)
    * masm fixes (merged)
    * quoted filenames for go32v2 and win32

  Revision 1.20  2001/06/13 18:31:57  peter
    * smartlink with dll fixed (merged)

  Revision 1.19  2001/04/21 15:34:49  peter
    * used target_asm.id instead of target_info.assem

  Revision 1.18  2001/04/18 22:01:53  peter
    * registration of targets and assemblers

  Revision 1.17  2001/04/13 01:22:06  peter
    * symtable change to classes
    * range check generation and errors fixed, make cycle DEBUG=1 works
    * memory leaks fixed

  Revision 1.16  2001/03/13 18:42:39  peter
    * don't create temporary smartlink dir for internalassembler

  Revision 1.15  2001/03/05 21:39:11  peter
    * changed to class with common TAssembler also for internal assembler

  Revision 1.14  2001/02/26 08:08:16  michael
  * bug correction: pipes must be closed by pclose (not close);
    There was too many not closed processes under Linux before patch.
    Test this by making a compiler under Linux with command
      OPT="-P" make
    and check a list of processes in another shell with
      ps -xa

  Revision 1.13  2001/02/20 21:36:39  peter
    * tasm/masm fixes merged

  Revision 1.12  2001/02/09 23:06:17  peter
    * fixed uninited var

  Revision 1.11  2001/02/05 20:46:59  peter
    * support linux unit for ver1_0 compilers

  Revision 1.10  2001/01/21 20:32:45  marco
   * Renamefest. Compiler part. Not that hard.

  Revision 1.9  2001/01/12 19:19:44  peter
    * fixed searching for utils

  Revision 1.8  2000/12/25 00:07:25  peter
    + new tlinkedlist class (merge of old tstringqueue,tcontainer and
      tlinkedlist objects)

  Revision 1.7  2000/11/13 15:26:12  marco
   * Renamefest

  Revision 1.6  2000/10/01 19:48:23  peter
    * lot of compile updates for cg11

  Revision 1.5  2000/09/24 15:06:11  peter
    * use defines.inc

  Revision 1.4  2000/08/27 16:11:49  peter
    * moved some util functions from globals,cobjects to cutils
    * splitted files into finput,fmodule

  Revision 1.3  2000/07/13 12:08:24  michael
  + patched to 1.1.0 with former 1.09patch from peter

  Revision 1.2  2000/07/13 11:32:32  michael
  + removed logs

}