{
    Copyright (c) 2000-2002 by Florian Klaempfl

    This file is the "loader" for the Free Pascal compiler

    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.

 ****************************************************************************}
program fpc;

{$mode objfpc}{$H+}

  uses
     Sysutils;

  const
{$ifdef UNIX}
    exeext='';
{$else UNIX}
  {$ifdef HASAMIGA}
    exeext='';
  {$else}
    {$ifdef NETWARE}
      exeext='.nlm';
    {$else}
      {$ifdef ATARI}
        exeext='.ttp';
      {$else}
        exeext='.exe';
      {$endif ATARI}
    {$endif NETWARE}
  {$endif HASAMIGA}
{$endif UNIX}


  procedure error(const s : string);

  begin
     writeln('Error: ',s);
     halt(1);
  end;

  function processortosuffix(processorstr : string ) : String;

  begin
    case processorstr of
      'aarch64': Result:='a64';
      'arm' : Result:='arm';
      'avr' : Result:='avr';
      'i386' : Result:='386';
      'i8086' : Result:='8086';
      'jvm' : Result:='jvm';
      'm68k' : Result:='68k';
      'mips' : Result:='mips';
      'mipsel' : Result:='mipsel';
      'powerpc' : Result:='ppc';
      'powerpc64' : Result:='ppc64';
      'riscv32' : Result:='rv32';
      'riscv64' : Result:='rv64';
      'sparc' : Result:='sparc';
      'sparc64' : Result:='sparc64';
      'x86_64' : Result:='x64';
      'xtensa' : Result:='xtensa';
      'z80' : Result:='z80';
      'wasm32' : Result:='wasm32'
    else
      error('Illegal processor type "'+processorstr+'"');
    end;
  end;

  procedure InitPlatform(var ppcbin,processorname : string);

  begin
    {$ifdef i386}
         ppcbin:='ppc386';
         processorname:='i386';
    {$endif i386}
    {$ifdef m68k}
         ppcbin:='ppc68k';
         processorname:='m68k';
    {$endif m68k}
    {$ifdef powerpc}
         ppcbin:='ppcppc';
         processorname:='powerpc';
    {$endif powerpc}
    {$ifdef powerpc64}
         ppcbin:='ppcppc64';
         processorname:='powerpc64';
    {$endif powerpc64}
    {$ifdef arm}
         ppcbin:='ppcarm';
         processorname:='arm';
    {$endif arm}
    {$ifdef aarch64}
         ppcbin:='ppca64';
         processorname:='aarch64';
    {$endif aarch64}
    {$ifdef sparc}
         ppcbin:='ppcsparc';
         processorname:='sparc';
    {$endif sparc}
    {$ifdef sparc64}
         ppcbin:='ppcsparc64';
         processorname:='sparc64';
    {$endif sparc64}
    {$ifdef x86_64}
         ppcbin:='ppcx64';
         processorname:='x86_64';
    {$endif x86_64}
    {$ifdef mipsel}
         ppcbin:='ppcmipsel';
         processorname:='mipsel';
    {$else : not mipsel}
      {$ifdef mips}
         ppcbin:='ppcmips';
         processorname:='mips';
      {$endif mips}
    {$endif not mipsel}
    {$ifdef riscv32}
         ppcbin:='ppcrv32';
         processorname:='riscv32';
    {$endif riscv32}
    {$ifdef riscv64}
         ppcbin:='ppcrv64';
         processorname:='riscv64';
    {$endif riscv64}
    {$ifdef xtensa}
         ppcbin:='ppcxtensa';
         processorname:='xtensa';
    {$endif xtensa}
    {$ifdef wasm32}
         ppcbin:='ppcwasm32';
         processorname:='wasm32';
    {$endif wasm32}
  end;

  function SplitPath(Const HStr:String):String;
    var
      i : longint;
    begin
      i:=Length(Hstr);
      while (i>0) and not(Hstr[i] in ['\','/']) do
       dec(i);
      SplitPath:=Copy(Hstr,1,i);
    end;


  function FileExists ( Const F : String) : Boolean;
    var
      Info : TSearchRec;
    begin
      FileExists:= findfirst(F,fareadonly+faarchive+fahidden,info)=0;
      findclose(Info);
    end;

  var
    extrapath : ansistring;

  function findexe(var ppcbin:string): boolean;
    var
      path : string;
    begin
      { add .exe extension }
      findexe:=false;
      ppcbin:=ppcbin+exeext;

      if (extrapath<>'') and (extrapath[length(extrapath)]<>DirectorySeparator) then
        extrapath:=extrapath+DirectorySeparator;
      { get path of fpc.exe }
      path:=splitpath(paramstr(0));
      { don't try with an empty extra patch, this might have strange results
        if the current directory contains a compiler
      }
      if (extrapath<>'') and FileExists(extrapath+ppcbin) then
       begin
         ppcbin:=extrapath+ppcbin;
         findexe:=true;
       end
      else if (path<>'') and FileExists(path+ppcbin) then
       begin
         ppcbin:=path+ppcbin;
         findexe:=true;
       end
      else
       begin
         path:=ExeSearch(ppcbin,getenvironmentvariable('PATH'));
         if path<>'' then
          begin
            ppcbin:=path;
            findexe:=true;
          end
       end;
    end;

    function findcompiler(basecompiler,cpusuffix,exesuffix : string) : string;

    begin
      Result:=basecompiler;
      if exesuffix<>'' then
        Result:=Result+'-'+exesuffix;
      if not findexe(Result) then
        begin
          if cpusuffix<>'' Then
            begin
              Result:='ppc'+cpusuffix;
              if exesuffix<>'' then
                result:=result+'-'+exesuffix;
              if not findexe(result) then
                result:='';
            end;
        end;
    end;

    procedure CheckSpecialProcessors(processorstr,processorname,ppcbin,cpusuffix,exesuffix : string);

    begin
      { -PB is a special code that will show the
        default compiler and exit immediately. It's
        main usage is for Makefile }
      if processorstr='B' then
        begin
          { report the full name of the ppcbin }
          writeln(findcompiler(ppcbin,cpusuffix,exesuffix));
          halt(0);
        end;
      { -PP is a special code that will show the
         processor and exit immediately. It's
         main usage is for Makefile }
      if processorstr='P' then
        begin
          { report the processor }
          writeln(processorname);
          halt(0);
        end;
   end;


  var
     s              : ansistring;
     cpusuffix,
     processorname,
     ppcbin,
     versionStr,
     processorstr   : string;
     ppccommandline : array of ansistring;
     ppccommandlinelen : longint;
     i : longint;
     errorvalue     : Longint;
  begin
     setlength(ppccommandline,paramcount);
     ppccommandlinelen:=0;
     cpusuffix     :='';        // if not empty, signals attempt at cross
                                // compiler.
     extrapath     :='';
     versionstr:='';                      { Default is just the name }
     initplatform(ppcbin,processorname);
     if ParamCount = 0 then
       begin
         SetLength (PPCCommandLine, 1);
         PPCCommandLine [PPCCommandLineLen] := '-?F' + ParamStr (0);
         Inc (PPCCommandLineLen);
       end
     else
      for i:=1 to paramcount do
       begin
          s:=paramstr(i);
          if pos('-V',s)=1 then
              versionstr:=copy(s,3,length(s)-2)
          else
            begin
              if pos('-P',s)=1 then
                 begin
                   processorstr:=copy(s,3,length(s)-2);
                   CheckSpecialProcessors(processorstr,processorname,ppcbin,cpusuffix,versionstr);
                   if processorstr <> processorname then
                     begin
                       cpusuffix:=processortosuffix(processorstr);

{$ifndef darwin}
                       ppcbin:='ppcross'+cpusuffix;
{$else not darwin}
                     { the mach-o format supports "fat" binaries whereby }
                     { a single executable contains machine code for     }
                     { several architectures -> it is counter-intuitive  }
                     { and non-standard to use different binary names    }
                     { for cross-compilers vs. native compilers          }
                     ppcbin:='ppc'+cpusuffix;
{$endif not darwin}
                     end;
                 end
              else if pos('-Xp',s)=1 then
                extrapath:=copy(s,4,length(s)-3)
              else
                begin
                  if pos('-h',s)=1 then
                    ppccommandline[ppccommandlinelen] := '-hF' + ParamStr (0)
                  else if pos('-?',s)=1 then
                    ppccommandline[ppccommandlinelen] := '-?F' + ParamStr (0)
                  else
                    ppccommandline[ppccommandlinelen]:=s;
                  inc(ppccommandlinelen);
                end;
            end;
       end;
     SetLength(ppccommandline,ppccommandlinelen);

     ppcbin:=findcompiler(ppcbin,cpusuffix,versionstr);

     { call ppcXXX }
     try
       errorvalue:=ExecuteProcess(ppcbin,ppccommandline);
     except
       on e : exception do
         error(ppcbin+' can''t be executed, error message: '+e.message);
     end;
     if (errorvalue<>0) and
        (paramcount<>0) then
       error(ppcbin+' returned an error exitcode');
     halt(errorvalue);
  end.