freepascal.compiler/compiler/systems.pas

{
    Copyright (c) 1998-2008 by Florian Klaempfl

    This unit contains information about the target systems supported
    (these are not processor specific)

    This program is free software; you can redistribute it and/or modify
    iu 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 systems;

{$i fpcdefs.inc}

interface

{$i systems.inc}

{*****************************************************************************
                               Structures
*****************************************************************************}

     type
       TAbstractResourceFile = class
         constructor create(const fn : ansistring);virtual;abstract;
       end;
       TAbstractResourceFileClass = class of TAbstractResourceFile;


       palignmentinfo = ^talignmentinfo;
       { this is written to ppus during token recording for generics so it must be packed }
       talignmentinfo = packed record
         procalign,
         loopalign,
         jumpalign,
         constalignmin,
         constalignmax,
         varalignmin,
         varalignmax,
         localalignmin,
         localalignmax,
         recordalignmin,
         recordalignmax,
         maxCrecordalign : longint;
       end;

       tasmflags = (af_none
         ,af_outputbinary
         ,af_needar
         ,af_smartlink_sections
         ,af_labelprefix_only_inside_procedure
         ,af_supports_dwarf
         ,af_no_debug
         ,af_stabs_use_function_absolute_addresses
         ,af_no_stabs
       );

       pasminfo = ^tasminfo;
       tasminfo = record
          id          : tasm;
          idtxt       : string[12];
          asmbin      : string[16];
          asmcmd      : string[70];
          supported_targets : set of tsystem;
          flags        : set of tasmflags;
          labelprefix : string[3];
          comment     : string[3];
          { set to '$' if that character is allowed in symbol names, otherwise
            to alternate character by which '$' should be replaced }
          dollarsign  : char;
       end;

       parinfo = ^tarinfo;
       tarinfo = record
          id          : tar;
          addfilecmd  : string[10];
          arfirstcmd  : string[50];
          arcmd       : string[50];
          arfinishcmd : string[10];
       end;

       presinfo = ^tresinfo;
       tresinfo = record
          id      : tres;
          { Compiler for resource (.rc or .res) to obj }
          resbin  : string[10];
          rescmd  : string[50];
          { Optional compiler for resource script (.rc) to binary resource (.res). }
          { If it is not provided resbin and rescmd will be used.                 }
          rcbin   : string[10];
          rccmd   : string[50];
          resourcefileclass : TAbstractResourceFileClass;
          resflags : set of tresinfoflags;
       end;

       pdbginfo = ^tdbginfo;
       tdbginfo = record
          id      : tdbg;
          idtxt   : string[12];
       end;

       tsystemflags = (tf_none,
            tf_under_development,
            tf_need_export,
            tf_needs_isconsole,
            tf_code_small,
            tf_static_reg_based,
            tf_needs_symbol_size,
            tf_smartlink_sections,
            tf_smartlink_library,
            tf_needs_dwarf_cfi,
            tf_use_8_3,
            tf_pic_uses_got,
            tf_library_needs_pic,
            tf_needs_symbol_type,
            tf_section_threadvars,
            tf_files_case_sensitive,
            tf_files_case_aware,
            tf_p_ext_support,
            tf_has_dllscanner,
            tf_use_function_relative_addresses,
            tf_winlikewidestring,
            tf_dwarf_relative_addresses,         // use offsets where the Dwarf spec requires this instead of absolute addresses (the latter is needed by Linux binutils)
            tf_dwarf_only_local_labels,          // only use local labels inside the Dwarf debug_info section (needed for e.g. Darwin)
            tf_requires_proper_alignment,
            tf_no_pic_supported,
            tf_pic_default,
            { the os does some kind of stack checking and it can be converted into a rte 202 }
            tf_no_generic_stackcheck,
            tf_emit_stklen,                     // Means that the compiler should emit a _stklen variable with the stack size, even if tf_no_generic_stackcheck is specified
            tf_has_winlike_resources,
            tf_safecall_clearstack,             // With this flag set, after safecall calls the caller cleans up the stack
            tf_safecall_exceptions,             // Exceptions in safecall calls are not raised, but passed to the caller as an ordinal (hresult) in the function result.
                                                // The original result (if it exists) is passed as an extra parameter
            tf_no_backquote_support,
            { do not generate an object file when smartlinking is turned on,
              this is usefull for architectures which require a small code footprint }
            tf_no_objectfiles_when_smartlinking,
            { indicates that the default value of the ts_cld target switch is 'on' for this target }
            tf_cld,
            { indicates that the default value of the ts_x86_far_procs_push_odd_bp target switch is 'on' for this target }
            tf_x86_far_procs_push_odd_bp,
            { indicates that this target can use dynamic packages otherwise an
              error will be generated if a package file is compiled }
            tf_supports_packages
       );

       psysteminfo = ^tsysteminfo;
       { using packed causes bus errors on processors which require alignment }
       tsysteminfo = record
          system       : tsystem;
          name         : string[34];
          shortname    : string[9];
          flags        : set of tsystemflags;
          cpu          : tsystemcpu;
          unit_env     : string[16];
          extradefines : string[40];
          exeext,
          defext,
          scriptext,
          smartext,
          unitext,
          unitlibext,
          asmext       : string[4];
          objext       : string[6];
          resext       : string[4];
          resobjext    : string[7];
          sharedlibext : string[10];
          staticlibext,
          staticlibprefix : string[4];
          sharedlibprefix : string[4];
          sharedClibext : string[10];
          staticClibext,
          staticClibprefix : string[4];
          sharedClibprefix : string[4];
          importlibprefix : string[10];
          importlibext : string[4];
          Cprefix      : string[2];
          newline      : string[2];
          dirsep       : char;
          assem        : tasm;
          assemextern  : tasm; { external assembler, used by -a }
          link         : tlink;
          linkextern   : tlink;  { external linker, used by -s }
          ar           : tar;
          res          : tres;
          dbg          : tdbg;
          script       : tscripttype;
          endian       : tendian;
          alignment    : talignmentinfo;
          {
            Offset from the argument pointer register to the first
            argument's address. On some machines it may depend on
            the data type of the function.
            (see also FIRST_PARM_OFFSET in GCC source)
          }
          first_parm_offset : longint;
          stacksize    : longint;
          { stack alignment }
          stackalign   : byte;
          abi          : tabi;
          { llvm -- varies wildly in length and is empty for many targets ->
            ansistring instead of shortstring; tsysteminfo records aren't
            copied very often anyway. These strings come from the file
            lib/Basic/Targets.cpp in the clang (cfe 3.3) source tree, sometimes
            adapted to match our (custom) stack alignment requirements }
          llvmdatalayout: ansistring;
       end;

    tabiinfo = record
      name: string[11];
      supported: boolean;
    end;

    const
       { alias for supported_target field in tasminfo }
       system_any = system_none;

       systems_wince = [system_arm_wince,system_i386_wince];
       systems_android = [system_arm_android, system_i386_android, system_mipsel_android];
       systems_linux = [system_i386_linux,system_x86_64_linux,system_powerpc_linux,system_powerpc64_linux,
                       system_arm_linux,system_sparc_linux,system_sparc64_linux,system_m68k_linux,
                       system_x86_6432_linux,system_mipseb_linux,system_mipsel_linux,system_aarch64_linux];
       systems_dragonfly = [system_x86_64_dragonfly];
       systems_freebsd = [system_i386_freebsd,
                          system_x86_64_freebsd];
       systems_netbsd  = [system_i386_netbsd,
                          system_m68k_netbsd,
                          system_powerpc_netbsd,
                          system_x86_64_netbsd];
       systems_openbsd = [system_i386_openbsd,
                          system_x86_64_openbsd];

       systems_bsd = systems_freebsd + systems_netbsd + systems_openbsd + systems_dragonfly;

       systems_aix = [system_powerpc_aix,system_powerpc64_aix];

       { all real windows systems, no cripple ones like win16, wince, wdosx et. al. }
       systems_windows = [system_i386_win32,system_x86_64_win64];

       { all windows systems }
       systems_all_windows = [system_i386_win32,system_x86_64_win64,
                             system_arm_wince,system_i386_wince,
                             system_i8086_win16];

       { all darwin systems }
       systems_darwin = [system_powerpc_darwin,system_i386_darwin,
                         system_powerpc64_darwin,system_x86_64_darwin,
                         system_arm_darwin,system_i386_iphonesim,
                         system_aarch64_darwin,system_x86_64_iphonesim];

       {all solaris systems }
       systems_solaris = [system_sparc_solaris, system_i386_solaris,
                          system_x86_64_solaris];

       { all embedded systems }
       systems_embedded = [system_i386_embedded,system_m68k_embedded,
                           system_powerpc_embedded,
                           system_sparc_embedded,obsolete_system_vm_embedded,
                           obsolete_system_ia64_embedded,system_x86_64_embedded,
                           system_mips_embedded,system_arm_embedded,
                           system_powerpc64_embedded,system_avr_embedded,
                           system_jvm_java32,system_mipseb_embedded,system_mipsel_embedded,
                           system_i8086_embedded];

       { all systems that allow section directive }
       systems_allow_section = systems_embedded;

       { systems that uses dotted function names as descriptors }
       systems_dotted_function_names = [system_powerpc64_linux]+systems_aix;

       systems_allow_section_no_semicolon = systems_allow_section
{$ifndef DISABLE_TLS_DIRECTORY}
       + systems_windows
{$endif not DISABLE_TLS_DIRECTORY}
       ;

       { systems that allow external far variables }
       systems_allow_external_far_var = [system_i8086_msdos,system_i8086_win16,system_i8086_embedded];

       { all symbian systems }
       systems_symbian = [system_i386_symbian,system_arm_symbian];

       { all classic Mac OS targets }
       systems_macos = [system_m68k_macos,system_powerpc_macos];

       { all OS/2 targets }
       systems_os2 = [system_i386_OS2,system_i386_emx];

       { AROS systems }
       systems_aros = [system_i386_aros,system_x86_64_aros,system_arm_aros];

       { all amiga like systems }
       systems_amigalike = [system_m68k_amiga,system_powerpc_morphos,system_powerpc_amiga]+systems_aros;

       { all native nt systems }
       systems_nativent = [system_i386_nativent];

       { systems supporting Objective-C }
       systems_objc_supported = systems_darwin;

       { systems using the non-fragile Objective-C ABI }
       systems_objc_nfabi = [system_powerpc64_darwin,system_x86_64_darwin,system_arm_darwin,system_i386_iphonesim,system_aarch64_darwin,system_x86_64_iphonesim];

       { systems supporting "blocks" }
       systems_blocks_supported = systems_darwin;

       { all systems supporting exports from programs or units }
       systems_unit_program_exports = [system_i386_win32,
                                         system_i386_wdosx,
                                         system_i386_Netware,
                                         system_i386_netwlibc,
                                         system_arm_wince,
                                         system_x86_64_win64,
                                         system_i8086_win16]+systems_linux+systems_android;

       { all systems that reference symbols in other binaries using indirect imports }
       systems_indirect_var_imports = systems_all_windows+[system_i386_nativent];

       { all systems that support indirect entry information }
       systems_indirect_entry_information = systems_darwin+[system_i386_win32,system_x86_64_win64,system_x86_64_linux];

       { all systems for which weak linking has been tested/is supported }
       systems_weak_linking = systems_darwin + systems_solaris + systems_linux + systems_android;

       systems_internal_sysinit = [system_i386_win32,system_x86_64_win64,
                                   system_i386_linux,system_powerpc64_linux,system_sparc64_linux,
                                   system_m68k_atari,system_m68k_palmos
                                  ]+systems_darwin+systems_amigalike;

       { all systems that use garbage collection for reference-counted types }
       systems_garbage_collected_managed_types = [
         system_jvm_java32,
         system_jvm_android32
       ];

       { all systems that use a managed vm (-> no real pointers, internal VMT
         format, ...) }
       systems_managed_vm = [
         system_jvm_java32,
         system_jvm_android32
       ];

       { all systems based on the JVM }
       systems_jvm = [
         system_jvm_java32,
         system_jvm_android32
       ];

       { all systems where typed constants have to be translated into node
         trees that initialise the data instead of into data sections }
       systems_typed_constants_node_init = [
         system_jvm_java32,
         system_jvm_android32
       ];

       { all systems that don't use a built-in framepointer for accessing nested
         variables, but emulate it by wrapping nested variables in records
         whose address is passed around }
       systems_fpnestedstruct = [
{$ifndef llvm}
         system_jvm_java32,
         system_jvm_android32
{$else not llvm}
         low(tsystem)..high(tsystem)
{$endif not llvm}
       ];

       { all systems where a value parameter passed by reference must be copied
         on the caller side rather than on the callee side }
       systems_caller_copy_addr_value_para = [system_aarch64_darwin,system_aarch64_linux];

       { pointer checking (requires special code in FPC_CHECKPOINTER,
         and can never work for libc-based targets or any other program
         linking to an external library)
       }
       systems_support_checkpointer = systems_linux
                             + [system_i386_win32]
                             + [system_i386_GO32V2]
                             + [system_i386_os2]
                             + [system_i386_beos,system_i386_haiku]
                             + [system_powerpc_morphos];

       cpu2str : array[TSystemCpu] of string[10] =
            ('','i386','m68k','alpha','powerpc','sparc','vm','ia64','x86_64',
             'mips','arm', 'powerpc64', 'avr', 'mipsel','jvm', 'i8086',
             'aarch64', 'wasm', 'sparc64');

       abiinfo : array[tabi] of tabiinfo = (
         (name: 'DEFAULT'; supported: true),
         (name: 'SYSV'   ; supported:{$if defined(powerpc) or defined(powerpc64)}true{$else}false{$endif}),
         (name: 'AIX'    ; supported:{$if defined(powerpc) or defined(powerpc64)}true{$else}false{$endif}),
         (name: 'DARWIN'    ; supported:{$if defined(powerpc) or defined(powerpc64)}true{$else}false{$endif}),
         (name: 'ELFV2'  ; supported:{$if defined(powerpc64)}true{$else}false{$endif}),
         (name: 'EABI'   ; supported:{$ifdef FPC_ARMEL}true{$else}false{$endif}),
         (name: 'ARMEB'  ; supported:{$ifdef FPC_ARMEB}true{$else}false{$endif}),
         (name: 'EABIHF' ; supported:{$ifdef FPC_ARMHF}true{$else}false{$endif}),
         (name: 'OLDWIN32GNU'; supported:{$ifdef I386}true{$else}false{$endif}),
         (name: 'AARCH64IOS'; supported:{$ifdef aarch64}true{$else}false{$endif})
       );

    var
       targetinfos   : array[tsystem] of psysteminfo;
       arinfos       : array[tar] of parinfo;
       resinfos      : array[tres] of presinfo;
       asminfos      : array[tasm] of pasminfo;
       dbginfos      : array[tdbg] of pdbginfo;

       source_info : tsysteminfo;
       target_cpu  : tsystemcpu;
       target_info : tsysteminfo;
       target_asm  : tasminfo;
       target_ar   : tarinfo;
       target_res  : tresinfo;
       target_dbg  : tdbginfo;
       target_cpu_string,
       target_os_string   : string[12]; { for rtl/<X>/,fcl/<X>/, etc. }
       target_full_string : string[24];

    function set_target(t:tsystem):boolean;
    function set_target_asm(t:tasm):boolean;
    function set_target_ar(t:tar):boolean;
    function set_target_res(t:tres):boolean;
    function set_target_dbg(t:tdbg):boolean;

    function find_system_by_string(const s : string) : tsystem;
    function find_asm_by_string(const s : string) : tasm;
    function find_dbg_by_string(const s : string) : tdbg;

    procedure set_source_info(const ti : tsysteminfo);

    function UpdateAlignment(var d:talignmentinfo;const s:talignmentinfo) : boolean;

    procedure RegisterTarget(const r:tsysteminfo);
    procedure RegisterRes(const r:tresinfo; rcf : TAbstractResourceFileClass);
    procedure RegisterAr(const r:tarinfo);

    procedure InitSystems;

    {$ifdef FreeBSD}
        function GetOSRelDate:Longint;
    {$endif}

implementation

    uses
      cutils{$ifdef FreeBSD},SysCtl,BaseUnix{$endif};

{****************************************************************************
           OS runtime version detection utility routine
****************************************************************************}

{$ifdef FreeBSD}
function GetOSRelDate:Longint;

{ FPSysCtl first argument was of type pchar
  up to commit 35566 from 2017/03/11 
  and corrected to pcint in that commit.
  But the following code needs to work with
  both old 3.0.X definition and new definition using pcint type.
  Problem solved using a special type called
  FPSysCtlFirstArgType. }
{$if defined(VER3_0_0) or defined(VER3_0_2)}  
type
  FPSysCtlFirstArgType = PChar;
{$else}
type
  FPSysCtlFirstArgType = pcint;
{$endif}  

var
        mib  : array[0..1] of cint;
        rval : cint;
        len  : size_t;
        i    : longint;
        v    : longint;
        oerrno : cint;
        S    : AnsiString;

Begin
        s:='ab';
        SetLength(S,50);
        mib[0] := CTL_KERN;
        mib[1] := KERN_OSRELDATE;
        len    := 4;
        oerrno:= fpgeterrno;
        if (FPsysctl(FPSysCtlFirstArgType(@mib), 2, pchar(@v), @len, NIL, 0) = -1) Then
             Begin
                if (fpgeterrno = ESysENOMEM) Then
                        fpseterrno(oerrno);
                GetOSRelDate:=0;
           End
        else
         GetOSRelDate:=v;
End;
{$endif}


{****************************************************************************
                              Target setting
****************************************************************************}

function set_target(t:tsystem):boolean;
begin
  set_target:=false;
  if assigned(targetinfos[t]) then
   begin
     target_info:=targetinfos[t]^;
     set_target_asm(target_info.assem);
     set_target_ar(target_info.ar);
     set_target_res(target_info.res);
     set_target_dbg(target_info.dbg);
     target_cpu:=target_info.cpu;
     target_os_string:=lower(target_info.shortname);
     target_cpu_string:=cpu2str[target_cpu];
     target_full_string:=target_cpu_string+'-'+target_os_string;
     set_target:=true;
     exit;
   end;
end;


function set_target_asm(t:tasm):boolean;
begin
  set_target_asm:=false;
  if assigned(asminfos[t]) and
    ((target_info.system in asminfos[t]^.supported_targets) or
     (system_any in asminfos[t]^.supported_targets)) then
   begin
     target_asm:=asminfos[t]^;
     set_target_asm:=true;
     exit;
   end;
end;


function set_target_ar(t:tar):boolean;
begin
  result:=false;
  if assigned(arinfos[t]) then
   begin
     target_ar:=arinfos[t]^;
     result:=true;
     exit;
   end;
end;


function set_target_res(t:tres):boolean;
begin
  result:=false;
  if assigned(resinfos[t]) then
   begin
     target_res:=resinfos[t]^;
     result:=true;
     exit;
   end
  else
   FillByte(target_res,sizeof(target_res),0);
end;


function set_target_dbg(t:tdbg):boolean;
begin
  result:=false;
{ no debugging support for llvm yet }
{$ifndef llvm}
  if assigned(dbginfos[t]) then
   begin
     target_dbg:=dbginfos[t]^;
     result:=true;
     exit;
   end;
{$endif}
end;


function find_system_by_string(const s : string) : tsystem;
var
  hs : string;
  t  : tsystem;
begin
  result:=system_none;
  hs:=upper(s);
  for t:=low(tsystem) to high(tsystem) do
   if assigned(targetinfos[t]) and
      (upper(targetinfos[t]^.shortname)=hs) then
    begin
      result:=t;
      exit;
    end;
end;


function find_asm_by_string(const s : string) : tasm;
var
  hs : string;
  t  : tasm;
begin
  result:=as_none;
  hs:=upper(s);
  for t:=low(tasm) to high(tasm) do
   if assigned(asminfos[t]) and
      (asminfos[t]^.idtxt=hs) then
    begin
      result:=t;
      exit;
    end;
end;


function find_dbg_by_string(const s : string) : tdbg;
var
  hs : string;
  t  : tdbg;
begin
  result:=dbg_none;
  hs:=upper(s);
  for t:=low(tdbg) to high(tdbg) do
   if assigned(dbginfos[t]) and
      (dbginfos[t]^.idtxt=hs) then
    begin
      result:=t;
      exit;
    end;
end;


function UpdateAlignment(var d:talignmentinfo;const s:talignmentinfo) : boolean;
begin
  result:=true;
  with d do
   begin
     if (s.procalign in [1,2,4,8,16,32,64,128]) or (s.procalign=256) then
       procalign:=s.procalign
     else if s.procalign<>0 then
       result:=false;
     if (s.loopalign in [1,2,4,8,16,32,64,128]) or (s.loopalign=256) then
       loopalign:=s.loopalign
     else if s.loopalign<>0 then
       result:=false;
     if (s.jumpalign in [1,2,4,8,16,32,64,128]) or (s.jumpalign=256) then
       jumpalign:=s.jumpalign
     else if s.jumpalign<>0 then
       result:=false;
     { general update rules:
       minimum: if higher then update
       maximum: if lower then update or if undefined then update }
     if s.constalignmin>constalignmin then
      constalignmin:=s.constalignmin;
     if (constalignmax=0) or
        ((s.constalignmax>0) and (s.constalignmax<constalignmax)) then
      constalignmax:=s.constalignmax;
     if s.varalignmin>varalignmin then
      varalignmin:=s.varalignmin;
     if (varalignmax=0) or
        ((s.varalignmax>0) and (s.varalignmax<varalignmax)) then
      varalignmax:=s.varalignmax;
     if s.localalignmin>localalignmin then
      localalignmin:=s.localalignmin;
     if (localalignmax=0) or
        ((s.localalignmax>0) and (s.localalignmax<localalignmax)) then
      localalignmax:=s.localalignmax;
     if s.recordalignmin>recordalignmin then
      recordalignmin:=s.recordalignmin;
     if (recordalignmax=0) or
        ((s.recordalignmax>0) and (s.recordalignmax<recordalignmax)) then
      recordalignmax:=s.recordalignmax;
     if (maxCrecordalign=0) or
        ((s.maxCrecordalign>0) and (s.maxCrecordalign<maxCrecordalign)) then
      maxCrecordalign:=s.maxCrecordalign;
   end;
end;


{****************************************************************************
                              Target registration
****************************************************************************}

procedure RegisterTarget(const r:tsysteminfo);
var
  t : tsystem;
begin
  t:=r.system;
  if assigned(targetinfos[t]) then
   writeln('Warning: Target is already registered!')
  else
   new(targetinfos[t]);
  targetinfos[t]^:=r;
end;


procedure RegisterRes(const r:tresinfo; rcf : TAbstractResourceFileClass);
var
  t : tres;
begin
  t:=r.id;
  if not assigned(resinfos[t]) then
    new(resinfos[t]);
  resinfos[t]^:=r;
  resinfos[t]^.resourcefileclass:=rcf;
end;


procedure RegisterAr(const r:tarinfo);
var
  t : tar;
begin
  t:=r.id;
  if assigned(arinfos[t]) then
    writeln('Warning: ar is already registered!')
  else
    new(arinfos[t]);
  arinfos[t]^:=r;
end;



procedure DeregisterInfos;
var
  assem   : tasm;
  target  : tsystem;
  ar      : tar;
  res     : tres;
  dbg     : tdbg;
begin
  for target:=low(tsystem) to high(tsystem) do
   if assigned(targetinfos[target]) then
    begin
      freemem(targetinfos[target],sizeof(tsysteminfo));
      targetinfos[target]:=nil;
    end;
  for assem:=low(tasm) to high(tasm) do
   if assigned(asminfos[assem]) then
    begin
      freemem(asminfos[assem],sizeof(tasminfo));
      asminfos[assem]:=nil;
    end;
  for ar:=low(tar) to high(tar) do
   if assigned(arinfos[ar]) then
    begin
      freemem(arinfos[ar],sizeof(tarinfo));
      arinfos[ar]:=nil;
    end;
  for res:=low(tres) to high(tres) do
   if assigned(resinfos[res]) then
    begin
      freemem(resinfos[res],sizeof(tresinfo));
      resinfos[res]:=nil;
    end;
  for dbg:=low(tdbg) to high(tdbg) do
   if assigned(dbginfos[dbg]) then
    begin
      freemem(dbginfos[dbg],sizeof(tdbginfo));
      dbginfos[dbg]:=nil;
    end;
end;


{****************************************************************************
                      Initialization of default target
****************************************************************************}

procedure default_target(t:tsystem);
begin
  set_target(t);
  if source_info.name='' then
    source_info:=target_info;
end;


procedure set_source_info(const ti : tsysteminfo);
begin
{ can't use message() here (PFV) }
  if source_info.name<>'' then
    Writeln('Warning: Source OS Redefined!');
  source_info:=ti;
end;


procedure InitSystems;
begin
{ Now default target, this is dependent on the target cpu define,
  when the define is the same as the source cpu then we use the source
  os, else we pick a default }
{$ifdef i386}
  {$ifdef cpui386}
    default_target(source_info.system);
    {$define default_target_set}
  {$else cpui386}
   {$ifdef linux}
    default_target(system_i386_linux);
    {$define default_target_set}
   {$endif}
   {$ifdef freebsd}
    default_target(system_i386_freebsd);
    {$define default_target_set}
   {$endif}
   {$ifdef openbsd}
    default_target(system_i386_openbsd);
    {$define default_target_set}
   {$endif}
   {$ifdef netbsd}
    default_target(system_i386_netbsd);
    {$define default_target_set}
   {$endif}
   {$ifdef darwin}
    default_target(system_i386_darwin);
    {$define default_target_set}
   {$endif}
   {$ifdef android}
    {$define default_target_set}
    default_target(system_i386_android);
   {$endif}
   {$ifdef solaris}
    {$define default_target_set}
    default_target(system_i386_solaris);
   {$endif}
  {$endif cpui386}
  { default is linux }
  {$ifndef default_target_set}
   default_target(system_i386_linux);
  {$endif default_target_set}
{$endif i386}

{$ifdef x86_64}
  {$ifdef cpux86_64}
    default_target(source_info.system);
    {$define default_target_set}
  {$else cpux86_64}
   {$ifdef MSWindows}
    default_target(system_x86_64_win64);
    {$define default_target_set}
   {$endif}
   {$ifdef linux}
    default_target(system_x86_64_linux);
    {$define default_target_set}
   {$endif}
   {$ifdef dragonfly}
    default_target(system_x86_64_dragonfly);
    {$define default_target_set}
   {$endif}
   {$ifdef freebsd}
    default_target(system_x86_64_freebsd);
    {$define default_target_set}
   {$endif}
   {$ifdef openbsd}
    default_target(system_x86_64_openbsd);
    {$define default_target_set}
   {$endif}
   {$ifdef netbsd}
    default_target(system_x86_64_netbsd);
    {$define default_target_set}
   {$endif}
   {$ifdef solaris}
    default_target(system_x86_64_solaris);
    {$define default_target_set}
   {$endif}
   {$ifdef darwin}
    default_target(system_x86_64_darwin);
    {$define default_target_set}
   {$endif}
  {$endif cpux86_64}
  { default is linux }
  {$ifndef default_target_set}
   default_target(system_x86_64_linux);
  {$endif default_target_set}
{$endif x86_64}

{$ifdef m68k}
  {$ifdef cpu68}
    default_target(source_info.system);
  {$else cpu68}
    default_target(system_m68k_linux);
  {$endif cpu68}
{$endif m68k}

{$ifdef powerpc}
  {$ifdef cpupowerpc32}
    default_target(source_info.system);
    {$define default_target_set}
  {$else cpupowerpc}
   {$ifdef linux}
    default_target(system_powerpc_linux);
    {$define default_target_set}
   {$endif}
   {$ifdef darwin}
    default_target(system_powerpc_darwin);
    {$define default_target_set}
   {$endif}
  {$endif cpupowerpc}
  {$ifdef aix}
   default_target(system_powerpc_aix);
   {$define default_target_set}
  {$endif}
  {$ifndef default_target_set}
    default_target(system_powerpc_linux);
  {$endif default_target_set}
{$endif powerpc}

{$ifdef POWERPC64}
  {$ifdef cpupowerpc64}
    default_target(source_info.system);
    {$define default_target_set}
  {$else cpupowerpc64}
    {$ifdef darwin}
     default_target(system_powerpc64_darwin);
     {$define default_target_set}
    {$endif}
    {$ifdef linux}
     default_target(system_powerpc64_linux);
     {$define default_target_set}
    {$endif}
    {$ifdef aix}
     default_target(system_powerpc64_aix);
     {$define default_target_set}
    {$endif}
  {$endif cpupowerpc64}
  {$ifndef default_target_set}
    default_target(system_powerpc64_linux);
    {$define default_target_set}
  {$endif}
{$endif POWERPC64}

{$ifdef sparc}
  {$ifdef cpusparc}
    default_target(source_info.system);
  {$else cpusparc}
   {$ifdef solaris}
    {$define default_target_set}
    default_target(system_sparc_solaris);
   {$endif}
    {$ifndef default_target_set}
    default_target(system_sparc_linux);
    {$endif ndef default_target_set}
  {$endif cpusparc}
{$endif sparc}

{$ifdef sparc64}
  {$ifdef cpusparc64}
    default_target(source_info.system);
  {$else cpusparc64}
   {$ifdef solaris}
    {$define default_target_set}
    default_target(system_sparc64_solaris);
   {$endif}
    {$ifndef default_target_set}
    default_target(system_sparc64_linux);
    {$endif ndef default_target_set}
  {$endif cpusparc64}
{$endif sparc64}

{$ifdef arm}
  {$ifdef cpuarm}
    default_target(source_info.system);
  {$else cpuarm}
    {$ifdef WINDOWS}
      {$define default_target_set}
      default_target(system_arm_wince);
    {$endif}
    {$ifdef linux}
      {$define default_target_set}
      default_target(system_arm_linux);
    {$endif}
    {$ifdef android}
      {$define default_target_set}
      default_target(system_arm_android);
    {$endif}
    {$ifdef darwin}
      {$define default_target_set}
      default_target(system_arm_darwin);
    {$endif}
    {$ifndef default_target_set}
      default_target(system_arm_linux);
      {$define default_target_set}
    {$endif}
  {$endif cpuarm}
{$endif arm}

{$ifdef avr}
  default_target(system_avr_embedded);
{$endif avr}

{$ifdef mips}
{$ifdef mipsel}
  {$ifdef cpumipsel}
    default_target(source_info.system);
  {$else cpumipsel}
    default_target(system_mipsel_linux);
  {$endif cpumipsel}
{$else mipsel}
  default_target(system_mipseb_linux);
{$endif mipsel}
{$endif mips}

{$ifdef jvm}
  default_target(system_jvm_java32);
{$endif jvm}

{$ifdef i8086}
  default_target(system_i8086_msdos);
{$endif i8086}

{$ifdef aarch64}
  {$ifdef cpuaarch64}
    default_target(source_info.system);
  {$else cpuaarch64}
    {$ifdef darwin}
      {$define default_target_set}
      default_target(system_aarch64_darwin);
    {$endif darwin}
    {$ifndef default_target_set}
      default_target(system_aarch64_linux);
      {$define default_target_set}
    {$endif}
  {$endif cpuaarch64}
{$endif aarch64}

{$ifdef wasm}
  default_target(system_wasm_wasm32);
{$endif}
end;


initialization
   source_info.name:='';
finalization
  DeregisterInfos;
end.