gcc/ada/switch.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                               S W I T C H                                --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 with Osint;  use Osint;
  27 with Output; use Output;
  28
  29 package body Switch is
  30
  31    ----------------
  32    -- Bad_Switch --
  33    ----------------
  34
  35    procedure Bad_Switch (Switch : Character) is
  36    begin
  37       Osint.Fail ("invalid switch: " & Switch);
  38    end Bad_Switch;
  39
  40    procedure Bad_Switch (Switch : String) is
  41    begin
  42       Osint.Fail ("invalid switch: " & Switch);
  43    end Bad_Switch;
  44
  45    ------------------------------
  46    -- Check_Version_And_Help_G --
  47    ------------------------------
  48
  49    procedure Check_Version_And_Help_G
  50      (Tool_Name      : String;
  51       Initial_Year   : String;
  52       Version_String : String := Gnatvsn.Gnat_Version_String)
  53    is
  54       Version_Switch_Present : Boolean := False;
  55       Help_Switch_Present    : Boolean := False;
  56       Next_Arg               : Natural;
  57
  58    begin
  59       --  First check for --version or --help
  60
  61       Next_Arg := 1;
  62       while Next_Arg < Arg_Count loop
  63          declare
  64             Next_Argv : String (1 .. Len_Arg (Next_Arg));
  65          begin
  66             Fill_Arg (Next_Argv'Address, Next_Arg);
  67
  68             if Next_Argv = Version_Switch then
  69                Version_Switch_Present := True;
  70
  71             elsif Next_Argv = Help_Switch then
  72                Help_Switch_Present := True;
  73             end if;
  74
  75             Next_Arg := Next_Arg + 1;
  76          end;
  77       end loop;
  78
  79       --  If --version was used, display version and exit
  80
  81       if Version_Switch_Present then
  82          Set_Standard_Output;
  83          Display_Version (Tool_Name, Initial_Year, Version_String);
  84          Write_Str (Gnatvsn.Gnat_Free_Software);
  85          Write_Eol;
  86          Write_Eol;
  87          Exit_Program (E_Success);
  88       end if;
  89
  90       --  If --help was used, display help and exit
  91
  92       if Help_Switch_Present then
  93          Set_Standard_Output;
  94          Usage;
  95          Write_Eol;
  96          Write_Line ("Report bugs to report@adacore.com");
  97          Exit_Program (E_Success);
  98       end if;
  99    end Check_Version_And_Help_G;
 100
 101    ---------------------
 102    -- Display_Version --
 103    ---------------------
 104
 105    procedure Display_Version
 106      (Tool_Name      : String;
 107       Initial_Year   : String;
 108       Version_String : String := Gnatvsn.Gnat_Version_String)
 109    is
 110    begin
 111       Write_Str (Tool_Name);
 112       Write_Char (' ');
 113       Write_Str (Version_String);
 114       Write_Eol;
 115
 116       Write_Str ("Copyright (C) ");
 117       Write_Str (Initial_Year);
 118       Write_Char ('-');
 119       Write_Str (Gnatvsn.Current_Year);
 120       Write_Str (", ");
 121       Write_Str (Gnatvsn.Copyright_Holder);
 122       Write_Eol;
 123    end Display_Version;
 124
 125    -------------------------
 126    -- Is_Front_End_Switch --
 127    -------------------------
 128
 129    function Is_Front_End_Switch (Switch_Chars : String) return Boolean is
 130       Ptr : constant Positive := Switch_Chars'First;
 131    begin
 132       return Is_Switch (Switch_Chars)
 133         and then
 134           (Switch_Chars (Ptr + 1) = 'I'
 135             or else (Switch_Chars'Length >= 5
 136                       and then Switch_Chars (Ptr + 1 .. Ptr + 4) = "gnat")
 137             or else (Switch_Chars'Length >= 5
 138                       and then Switch_Chars (Ptr + 2 .. Ptr + 4) = "RTS"));
 139    end Is_Front_End_Switch;
 140
 141    ----------------------------
 142    -- Is_Internal_GCC_Switch --
 143    ----------------------------
 144
 145    function Is_Internal_GCC_Switch (Switch_Chars : String) return Boolean is
 146       First : constant Natural := Switch_Chars'First + 1;
 147       Last  : constant Natural := Switch_Last (Switch_Chars);
 148    begin
 149       return Is_Switch (Switch_Chars)
 150         and then
 151           (Switch_Chars (First .. Last) = "-param"        or else
 152            Switch_Chars (First .. Last) = "dumpbase"      or else
 153            Switch_Chars (First .. Last) = "auxbase-strip" or else
 154            Switch_Chars (First .. Last) = "auxbase");
 155    end Is_Internal_GCC_Switch;
 156
 157    ---------------
 158    -- Is_Switch --
 159    ---------------
 160
 161    function Is_Switch (Switch_Chars : String) return Boolean is
 162    begin
 163       return Switch_Chars'Length > 1
 164         and then Switch_Chars (Switch_Chars'First) = '-';
 165    end Is_Switch;
 166
 167    -----------------
 168    -- Switch_last --
 169    -----------------
 170
 171    function Switch_Last (Switch_Chars : String) return Natural is
 172       Last : constant Natural := Switch_Chars'Last;
 173    begin
 174       if Last >= Switch_Chars'First
 175         and then Switch_Chars (Last) = ASCII.NUL
 176       then
 177          return Last - 1;
 178       else
 179          return Last;
 180       end if;
 181    end Switch_Last;
 182
 183    -----------------
 184    -- Nat_Present --
 185    -----------------
 186
 187    function Nat_Present
 188      (Switch_Chars : String;
 189       Max          : Integer;
 190       Ptr          : Integer) return Boolean
 191    is
 192    begin
 193       return (Ptr <= Max
 194                 and then Switch_Chars (Ptr) in '0' .. '9')
 195         or else
 196              (Ptr < Max
 197                 and then Switch_Chars (Ptr) = '='
 198                 and then Switch_Chars (Ptr + 1) in '0' .. '9');
 199    end Nat_Present;
 200
 201    --------------
 202    -- Scan_Nat --
 203    --------------
 204
 205    procedure Scan_Nat
 206      (Switch_Chars : String;
 207       Max          : Integer;
 208       Ptr          : in out Integer;
 209       Result       : out Nat;
 210       Switch       : Character)
 211    is
 212    begin
 213       Result := 0;
 214
 215       if not Nat_Present (Switch_Chars, Max, Ptr) then
 216          Osint.Fail ("missing numeric value for switch: " & Switch);
 217       end if;
 218
 219       if Switch_Chars (Ptr) = '=' then
 220          Ptr := Ptr + 1;
 221       end if;
 222
 223       while Ptr <= Max and then Switch_Chars (Ptr) in '0' .. '9' loop
 224          Result :=
 225            Result * 10 +
 226              Character'Pos (Switch_Chars (Ptr)) - Character'Pos ('0');
 227          Ptr := Ptr + 1;
 228
 229          if Result > Switch_Max_Value then
 230             Osint.Fail ("numeric value out of range for switch: " & Switch);
 231          end if;
 232       end loop;
 233    end Scan_Nat;
 234
 235    --------------
 236    -- Scan_Pos --
 237    --------------
 238
 239    procedure Scan_Pos
 240      (Switch_Chars : String;
 241       Max          : Integer;
 242       Ptr          : in out Integer;
 243       Result       : out Pos;
 244       Switch       : Character)
 245    is
 246       Temp : Nat;
 247
 248    begin
 249       Scan_Nat (Switch_Chars, Max, Ptr, Temp, Switch);
 250
 251       if Temp = 0 then
 252          Osint.Fail ("numeric value out of range for switch: " & Switch);
 253       end if;
 254
 255       Result := Temp;
 256    end Scan_Pos;
 257
 258 end Switch;