fpc/compiler/systems/t_android.pas

{
    Copyright (c) 1998-2008 by Peter Vreman

    This unit implements support import,export,link routines
    for the Android target

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 ****************************************************************************
}
unit t_android;

{$i fpcdefs.inc}

interface

  uses
    aasmdata,
    symsym,symdef,ppu,
    import,export,expunix,link;

  type
    timportlibandroid=class(timportlib)
      procedure generatelib;override;
    end;

    texportlibandroid=class(texportlibunix)
      procedure setfininame(list: TAsmList; const s: string); override;
    end;

    tlinkerandroid=class(texternallinker)
    private
      libctype:(libc5,glibc2,glibc21,uclibc);
      cprtobj,
      gprtobj,
      prtobj  : string[80];
      reorder : boolean;
      linklibc: boolean;
      Function  WriteResponseFile(isdll:boolean) : Boolean;
    public
      constructor Create;override;
      procedure SetDefaultInfo;override;
      procedure InitSysInitUnitName;override;
      function  MakeExecutable:boolean;override;
      function  MakeSharedLibrary:boolean;override;
      procedure LoadPredefinedLibraryOrder; override;
    end;


implementation

  uses
    SysUtils,
    cutils,cfileutl,cclasses,
    verbose,systems,globtype,globals,
    symconst,script,
    fmodule,
    aasmbase,aasmtai,aasmcpu,cpubase,
    cgbase,cgobj,cgutils,ogbase,ncgutil,
    comprsrc,
    rescmn, i_android
    ;

{*****************************************************************************
                               TIMPORTLIBANDROID
*****************************************************************************}

    procedure timportlibandroid.generatelib;
      var
        i : longint;
        ImportLibrary : TImportLibrary;
      begin
        for i:=0 to current_module.ImportLibraryList.Count-1 do
          begin
            ImportLibrary:=TImportLibrary(current_module.ImportLibraryList[i]);
            current_module.linkothersharedlibs.add(ImportLibrary.Name,link_always);
          end;
      end;


{*****************************************************************************
                               TEXPORTLIBANDROID
*****************************************************************************}

    procedure texportlibandroid.setfininame(list: TAsmList; const s: string);
      begin
        { the problem with not having a .fini section is that a finalization
          routine in regular code can get "smart" linked away -> reference it
          just like the debug info }
        new_section(list,sec_fpc,'links',0);
        list.concat(Tai_const.Createname(s,0));
        inherited setfininame(list,s);
      end;

{*****************************************************************************
                                  TLINKERANDROID
*****************************************************************************}

Constructor TLinkerAndroid.Create;
begin
  Inherited Create;
end;


procedure TLinkerAndroid.SetDefaultInfo;
{
  This will also detect which libc version will be used
}

const
{$ifdef arm}       platform_select='';{$endif} {unknown :( }
{$ifdef i386}      platform_select='';{$endif} {unknown :( }

var
  defdynlinker: string;
begin
  with Info do
   begin
     ExeCmd[1]:='ld '+platform_select+' $OPT $DYNLINK $STATIC $GCSECTIONS $STRIP -L. -o $EXE';
     { when we want to cross-link we need to override default library paths }
     if length(sysrootpath) > 0 then
       ExeCmd[1]:=ExeCmd[1]+' -T';
     ExeCmd[1]:=ExeCmd[1]+' $RES';
     DllCmd[1]:='ld '+platform_select+' $OPT $INIT $FINI $SONAME -shared -L. -o $EXE $RES';
     DllCmd[2]:='strip --strip-unneeded $EXE';
     ExtDbgCmd[1]:='objcopy --only-keep-debug $EXE $DBG';
     ExtDbgCmd[2]:='objcopy --add-gnu-debuglink=$DBG $EXE';
     ExtDbgCmd[3]:='strip --strip-unneeded $EXE';

{$ifdef arm}
     defdynlinker:='/system/bin/linker';
{$endif arm}
     {
       Search order:
         glibc 2.1+
         uclibc
         glibc 2.0
       If none is found (e.g. when cross compiling) glibc21 is assumed
     }
     if fileexists(sysrootpath+defdynlinker,false) then
       begin
         DynamicLinker:=defdynlinker;
         libctype:=glibc2;
       end
     else if fileexists(sysrootpath+'/lib/ld-uClibc.so.0',false) then
       begin
         dynamiclinker:='/lib/ld-uClibc.so.0';
         libctype:=uclibc;
       end
     else
       begin
         { when no dyn. linker is found, we are probably
           cross compiling, so use the default dyn. linker }
         DynamicLinker:=defdynlinker;
         {
           the default c startup script is gcrt0.as on all platforms
           except i386
         }
         libctype:=glibc2;
       end;
   end;
end;


procedure TLinkerAndroid.LoadPredefinedLibraryOrder;
// put your linkorder/linkalias overrides here.
// Note: assumes only called when reordering/aliasing is used.
Begin
   if not (cs_link_no_default_lib_order in  current_settings.globalswitches) Then
        Begin
          LinkLibraryOrder.add('gcc','',15);
          LinkLibraryOrder.add('c','',100);
          LinkLibraryOrder.add('gmon','',120);
          LinkLibraryOrder.add('dl','',140);
          LinkLibraryOrder.add('pthread','',160);
         end;
End;

Procedure TLinkerAndroid.InitSysInitUnitName;
var
  csysinitunit,
  gsysinitunit : string[20];
  hp           : tmodule;
begin
  hp:=tmodule(loaded_units.first);
  while assigned(hp) do
   begin
     linklibc := hp.linkothersharedlibs.find('c');
     if linklibc then break;
     hp:=tmodule(hp.next);
   end;
  reorder := linklibc and ReOrderEntries;
  if current_module.islibrary then
   begin
     sysinitunit:='dll';
     csysinitunit:='dll';
     gsysinitunit:='dll';
     prtobj:='dllprt0';
     cprtobj:='dllprt0';
     gprtobj:='dllprt0';
   end
  else
   begin
     prtobj:='prt0';
     sysinitunit:='prc';
     case libctype of
       glibc21:
         begin
           cprtobj:='cprt21';
           gprtobj:='gprt21';
           csysinitunit:='c21';
           gsysinitunit:='c21g';
         end;
       uclibc:
         begin
           cprtobj:='ucprt0';
           gprtobj:='ugprt0';
           csysinitunit:='uc';
           gsysinitunit:='ucg';
         end
       else
         cprtobj:='cprt0';
         gprtobj:='gprt0';
         csysinitunit:='c';
         gsysinitunit:='g';
     end;
   end;
  if cs_profile in current_settings.moduleswitches then
   begin
     prtobj:=gprtobj;
     sysinitunit:=gsysinitunit;
     linklibc:=true;
   end
  else
   begin
     if linklibc then
      begin
       prtobj:=cprtobj;
       sysinitunit:=csysinitunit;
      end;
   end;
  sysinitunit:='si_'+sysinitunit;
end;

Function TLinkerAndroid.WriteResponseFile(isdll:boolean) : Boolean;
Var
  linkres      : TLinkRes;
  i            : longint;
  HPath        : TCmdStrListItem;
  s,s1,s2      : TCmdStr;
  found1,
  found2       : boolean;
  linksToSharedLibFiles : boolean;
begin
  result:=False;
{ set special options for some targets }
  if cs_profile in current_settings.moduleswitches then
   begin
     if not(libctype in [glibc2,glibc21]) then
       AddSharedLibrary('gmon');
     AddSharedLibrary('c');
   end;

  { Open link.res file }
  LinkRes:=TLinkRes.Create(outputexedir+Info.ResName);
  with linkres do
    begin
      { Write path to search libraries }
      HPath:=TCmdStrListItem(current_module.locallibrarysearchpath.First);
      while assigned(HPath) do
       begin
         Add('SEARCH_DIR('+maybequoted(HPath.Str)+')');
         HPath:=TCmdStrListItem(HPath.Next);
       end;
      HPath:=TCmdStrListItem(LibrarySearchPath.First);
      while assigned(HPath) do
       begin
         Add('SEARCH_DIR('+maybequoted(HPath.Str)+')');
         HPath:=TCmdStrListItem(HPath.Next);
       end;

      { force local symbol resolution (i.e., inside the shared }
      { library itself) for all non-exorted symbols, otherwise }
      { several RTL symbols of FPC-compiled shared libraries   }
      { will be bound to those of a single shared library or   }
      { to the main program                                    }
      if (isdll) then
        begin
          add('VERSION');
          add('{');
          add('  {');
          if not texportlibunix(exportlib).exportedsymnames.empty then
            begin
              add('    global:');
              repeat
                add('      '+texportlibunix(exportlib).exportedsymnames.getfirst+';');
              until texportlibunix(exportlib).exportedsymnames.empty;
            end;
          add('    local:');
          add('      *;');
          add('  };');
          add('}');
        end;

      StartSection('INPUT(');
      { add objectfiles, start with prt0 always }
      if not (target_info.system in systems_internal_sysinit) and (prtobj<>'') then
       AddFileName(maybequoted(FindObjectFile(prtobj,'',false)));
      { try to add crti and crtbegin if linking to C }
      if linklibc and (libctype<>uclibc) then
       begin
         { crti.o must come first }
         if librarysearchpath.FindFile('crti.o',false,s) then
           AddFileName(s);
         { then the crtbegin* }
         if cs_create_pic in current_settings.moduleswitches then
           begin
             if librarysearchpath.FindFile('crtbeginS.o',false,s) then
               AddFileName(s);
           end
         else
           if (cs_link_staticflag in current_settings.globalswitches) and
              librarysearchpath.FindFile('crtbeginT.o',false,s) then
             AddFileName(s)
           else if librarysearchpath.FindFile('crtbegin.o',false,s) then
             AddFileName(s);
       end;
      { main objectfiles }
      while not ObjectFiles.Empty do
       begin
         s:=ObjectFiles.GetFirst;
         if s<>'' then
          AddFileName(maybequoted(s));
       end;
      EndSection(')');

      { Write staticlibraries }
      if not StaticLibFiles.Empty then
       begin
         Add('GROUP(');
         While not StaticLibFiles.Empty do
          begin
            S:=StaticLibFiles.GetFirst;
            AddFileName(maybequoted(s))
          end;
         Add(')');
       end;

      // we must reorder here because the result could empty sharedlibfiles
      if reorder Then
        ExpandAndApplyOrder(SharedLibFiles);
      // after this point addition of shared libs not allowed.

      { Write sharedlibraries like -l<lib>, also add the needed dynamic linker
        here to be sure that it gets linked this is needed for glibc2 systems (PFV) }
      if (isdll) then
       begin
         Add('INPUT(');
         Add(info.DynamicLinker);
         Add(')');
       end;
      linksToSharedLibFiles := not SharedLibFiles.Empty;

      if not SharedLibFiles.Empty then
       begin

         if (SharedLibFiles.Count<>1) or
            (TCmdStrListItem(SharedLibFiles.First).Str<>'c') or
            reorder then
           begin
             Add('INPUT(');
             While not SharedLibFiles.Empty do
              begin
                S:=SharedLibFiles.GetFirst;
                if (s<>'c') or reorder then
                 begin
                   i:=Pos(target_info.sharedlibext,S);
                   if i>0 then
                    Delete(S,i,255);
                   Add('-l'+s);
                 end
                else
                 begin
                   linklibc:=true;
                 end;
              end;
             Add(')');
           end
         else
           linklibc:=true;
         if (cs_link_staticflag in current_settings.globalswitches) or
            (linklibc and not reorder) then
           begin
             Add('GROUP(');
             { when we have -static for the linker the we also need libgcc }
             if (cs_link_staticflag in current_settings.globalswitches) then
               begin
                 Add('-lgcc');
                 if librarysearchpath.FindFile('libgcc_eh.a',false,s1) then
                   Add('-lgcc_eh');
               end;
             { be sure that libc is the last lib }
             if linklibc and not reorder then
               Add('-lc');
             Add(')');
           end;
       end;

      { objects which must be at the end }
      if linklibc and (libctype<>uclibc) then
       begin
         if cs_create_pic in current_settings.moduleswitches then
           found1:=librarysearchpath.FindFile('crtendS.o',false,s1)
         else
           found1:=librarysearchpath.FindFile('crtend.o',false,s1);
         found2:=librarysearchpath.FindFile('crtn.o',false,s2);
         if found1 or found2 then
          begin
            Add('INPUT(');
            if found1 then
             AddFileName(s1);
            if found2 then
             AddFileName(s2);
            Add(')');
          end;
       end;

      {Entry point. Only needed for executables, set on the linker command line for
       shared libraries. }
      if (not isdll) then
       if (linksToSharedLibFiles and not linklibc) then
        add('ENTRY(_dynamic_start)')
       else
        add('ENTRY(_start)');

{$ifdef ARM}
      if target_info.abi=abi_eabi then
        begin
          { from GNU ld (CodeSourcery Sourcery G++ Lite 2007q3-53) 2.18.50.20070820 }
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          add('SECTIONS');
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          add('       the constructors, so we make sure it is');
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          { extra by FPC }
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          add('    KEEP (*(.gnu.linkonce.d.*personality*))');
          add('    SORT(CONSTRUCTORS)');
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          add('  .debug_frame    0 : { *(.debug_frame) }');
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          add('  .debug_loc      0 : { *(.debug_loc) }');
          add('  .debug_macinfo  0 : { *(.debug_macinfo) }');
          add('  /* SGI/MIPS DWARF 2 extensions */');
          add('  .debug_weaknames 0 : { *(.debug_weaknames) }');
          add('  .debug_funcnames 0 : { *(.debug_funcnames) }');
          add('  .debug_typenames 0 : { *(.debug_typenames) }');
          add('  .debug_varnames  0 : { *(.debug_varnames) }');
          add('  /* DWARF 3 */');
          add('  .debug_pubtypes 0 : { *(.debug_pubtypes) }');
          add('  .debug_ranges   0 : { *(.debug_ranges) }');
          add('    .stack         0x80000 :');
          add('  {');
          add('    _stack = .;');
          add('    *(.stack)');
          add('  }');
          add('  .ARM.attributes 0 : { KEEP (*(.ARM.attributes)) KEEP (*(.gnu.attributes)) }');
          add('  .note.gnu.arm.ident 0 : { KEEP (*(.note.gnu.arm.ident)) }');
          add('  /DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) }');
          add('}');
        end;
{$endif ARM}

      { Write and Close response }
      writetodisk;
      Free;
    end;

  WriteResponseFile:=True;
end;


function TLinkerAndroid.MakeExecutable:boolean;
var
  i : longint;
  binstr,
  cmdstr  : TCmdStr;
  success : boolean;
  DynLinkStr : string;
  GCSectionsStr,
  StaticStr,
  StripStr   : string[40];
begin
  if not(cs_link_nolink in current_settings.globalswitches) then
   Message1(exec_i_linking,current_module.exefilename^);

{ Create some replacements }
  StaticStr:='';
  StripStr:='';
  GCSectionsStr:='';
  DynLinkStr:='';
  if (cs_link_staticflag in current_settings.globalswitches) then
   StaticStr:='-static';
  if (cs_link_strip in current_settings.globalswitches) and
     not(cs_link_separate_dbg_file in current_settings.globalswitches) then
   StripStr:='-s';
  if (cs_link_map in current_settings.globalswitches) then
   StripStr:='-Map '+maybequoted(ChangeFileExt(current_module.exefilename^,'.map'));
  if create_smartlink_sections then
   GCSectionsStr:='--gc-sections';
  If (cs_profile in current_settings.moduleswitches) or
     ((Info.DynamicLinker<>'') and (not SharedLibFiles.Empty)) then
   begin
     DynLinkStr:='--dynamic-linker='+Info.DynamicLinker;
     if cshared then
       DynLinkStr:=DynLinkStr+' --shared ';
     if rlinkpath<>'' then
       DynLinkStr:=DynLinkStr+' --rpath-link '+rlinkpath;
   End;

{ Write used files and libraries }
  WriteResponseFile(false);

{ Call linker }
  SplitBinCmd(Info.ExeCmd[1],binstr,cmdstr);
  Replace(cmdstr,'$EXE',maybequoted(current_module.exefilename^));
  Replace(cmdstr,'$OPT',Info.ExtraOptions);
  Replace(cmdstr,'$RES',maybequoted(outputexedir+Info.ResName));
  Replace(cmdstr,'$STATIC',StaticStr);
  Replace(cmdstr,'$STRIP',StripStr);
  Replace(cmdstr,'$GCSECTIONS',GCSectionsStr);
  Replace(cmdstr,'$DYNLINK',DynLinkStr);

  { create dynamic symbol table? }
  if HasExports then
    cmdstr:=cmdstr+' -E';

  success:=DoExec(FindUtil(utilsprefix+BinStr),CmdStr,true,false);

  { Create external .dbg file with debuginfo }
  if success and (cs_link_separate_dbg_file in current_settings.globalswitches) then
    begin
      for i:=1 to 3 do
        begin
          SplitBinCmd(Info.ExtDbgCmd[i],binstr,cmdstr);
          Replace(cmdstr,'$EXE',maybequoted(current_module.exefilename^));
          Replace(cmdstr,'$DBGFN',maybequoted(extractfilename(current_module.dbgfilename^)));
          Replace(cmdstr,'$DBG',maybequoted(current_module.dbgfilename^));
          success:=DoExec(FindUtil(utilsprefix+BinStr),CmdStr,true,false);
          if not success then
            break;
        end;
    end;

  { Remove ReponseFile }
  if (success) and not(cs_link_nolink in current_settings.globalswitches) then
   DeleteFile(outputexedir+Info.ResName);

  MakeExecutable:=success;   { otherwise a recursive call to link method }
end;


Function TLinkerAndroid.MakeSharedLibrary:boolean;
var
  InitStr,
  FiniStr,
  SoNameStr : string[80];
  binstr,
  cmdstr  : TCmdStr;
  success : boolean;
begin
  MakeSharedLibrary:=false;
  if not(cs_link_nolink in current_settings.globalswitches) then
   Message1(exec_i_linking,current_module.sharedlibfilename^);

{ Write used files and libraries }
  WriteResponseFile(true);

 { Create some replacements }
 { note: linux does not use exportlib.initname/fininame due to the custom startup code }
  InitStr:='-init FPC_SHARED_LIB_START';
  FiniStr:='-fini FPC_LIB_EXIT';
  SoNameStr:='-soname '+ExtractFileName(current_module.sharedlibfilename^);

{ Call linker }
  SplitBinCmd(Info.DllCmd[1],binstr,cmdstr);
  Replace(cmdstr,'$EXE',maybequoted(current_module.sharedlibfilename^));
  Replace(cmdstr,'$OPT',Info.ExtraOptions);
  Replace(cmdstr,'$RES',maybequoted(outputexedir+Info.ResName));
  Replace(cmdstr,'$INIT',InitStr);
  Replace(cmdstr,'$FINI',FiniStr);
  Replace(cmdstr,'$SONAME',SoNameStr);
  success:=DoExec(FindUtil(utilsprefix+binstr),cmdstr,true,false);

{ Strip the library ? }
  if success and (cs_link_strip in current_settings.globalswitches) then
   begin
     { only remove non global symbols and debugging info for a library }
     Info.DllCmd[2]:='strip --discard-all --strip-debug $EXE';
     SplitBinCmd(Info.DllCmd[2],binstr,cmdstr);
     Replace(cmdstr,'$EXE',maybequoted(current_module.sharedlibfilename^));
     success:=DoExec(FindUtil(utilsprefix+binstr),cmdstr,true,false);
   end;

{ Remove ReponseFile }
  if (success) and not(cs_link_nolink in current_settings.globalswitches) then
   DeleteFile(outputexedir+Info.ResName);

  MakeSharedLibrary:=success;   { otherwise a recursive call to link method }
end;

{*****************************************************************************
                                  Initialize
*****************************************************************************}

initialization
{$ifdef ARM}
  RegisterExternalLinker(system_arm_android_info,TLinkerAndroid);
  RegisterImport(system_arm_android,timportlibandroid);
  RegisterExport(system_arm_android,texportlibandroid);
  RegisterTarget(system_arm_android_info);
{$endif ARM}
{$ifdef I386}
  RegisterExternalLinker(system_i386_android_info,TLinkerAndroid);
  RegisterImport(system_i386_android,timportlibandroid);
  RegisterExport(system_i386_android,texportlibandroid);
  RegisterTarget(system_i386_android_info);
{$endif I386}
  RegisterRes(res_elf_info,TWinLikeResourceFile);
end.