gcc/ada/adabkend.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAAMP COMPILER COMPONENTS                        --
   4 --                                                                          --
   5 --                             A D A B K E N D                              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                     Copyright (C) 2001-2013, AdaCore                     --
  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 ------------------------------------------------------------------------------
  22
  23 --  This is the version of the Back_End package for back ends written in Ada
  24
  25 with Debug;
  26 with Lib;
  27 with Opt;      use Opt;
  28 with Output;   use Output;
  29 with Osint;    use Osint;
  30 with Osint.C;  use Osint.C;
  31 with Switch.C; use Switch.C;
  32 with Types;    use Types;
  33
  34 with System.OS_Lib; use System.OS_Lib;
  35
  36 package body Adabkend is
  37
  38    use Switch;
  39
  40    -------------------
  41    -- Call_Back_End --
  42    -------------------
  43
  44    procedure Call_Back_End is
  45    begin
  46       if (Opt.Verbose_Mode or Opt.Full_List)
  47         and then not Debug.Debug_Flag_7
  48       then
  49          Write_Eol;
  50          Write_Str (Product_Name);
  51          Write_Str (", Copyright ");
  52          Write_Str (Copyright_Years);
  53          Write_Str (" Ada Core Technologies, Inc.");
  54          Write_Str (" (http://www.adacore.com)");
  55          Write_Eol;
  56          Write_Eol;
  57       end if;
  58
  59       Driver (Lib.Cunit (Types.Main_Unit));
  60    end Call_Back_End;
  61
  62    ------------------------
  63    -- Scan_Compiler_Args --
  64    ------------------------
  65
  66    procedure Scan_Compiler_Arguments is
  67       Output_File_Name_Seen : Boolean := False;
  68       --  Set to True after having scanned the file_name for switch
  69       --  "-gnatO file_name"
  70
  71       Argument_Count : constant Integer := Arg_Count - 1;
  72       --  Number of arguments (excluding program name)
  73
  74       Args     : Argument_List (1 .. Argument_Count);
  75       Next_Arg : Positive := 1;
  76
  77       procedure Scan_Back_End_Switches (Switch_Chars : String);
  78       --  Procedure to scan out switches stored in Switch_Chars. The first
  79       --  character is known to be a valid switch character, and there are no
  80       --  blanks or other switch terminator characters in the string, so the
  81       --  entire string should consist of valid switch characters, except that
  82       --  an optional terminating NUL character is allowed.
  83       --
  84       --  If the switch is not valid, control will not return. The switches
  85       --  must still be scanned to skip the "-o" arguments, or internal GCC
  86       --  switches, which may be safely ignored by other back-ends.
  87
  88       ----------------------------
  89       -- Scan_Back_End_Switches --
  90       ----------------------------
  91
  92       procedure Scan_Back_End_Switches (Switch_Chars : String) is
  93          First : constant Positive := Switch_Chars'First + 1;
  94          Last  : constant Natural  := Switch_Last (Switch_Chars);
  95
  96       begin
  97          --  Process any back end switches, returning if the switch does not
  98          --  affect code generation or falling through if it does, so the
  99          --  switch will get stored.
 100
 101          if Is_Internal_GCC_Switch (Switch_Chars) then
 102             Next_Arg := Next_Arg + 1;
 103             return; -- ignore this switch
 104
 105          --  Record that an object file name has been specified. The actual
 106          --  file name argument is picked up and saved below by the main body
 107          --  of Scan_Compiler_Arguments.
 108
 109          elsif Switch_Chars (First .. Last) = "o" then
 110             if First = Last then
 111                Opt.Output_File_Name_Present := True;
 112                return;
 113             else
 114                Fail ("invalid switch: " & Switch_Chars);
 115             end if;
 116
 117          --  Set optimization indicators appropriately. In gcc-based GNAT this
 118          --  is picked up from imported variables set by the gcc driver, but
 119          --  for compilers with non-gcc back ends we do it here to allow use
 120          --  of these switches by the front end. Allowed optimization switches
 121          --  are -Os (optimize for size), -O[0123], and -O (same as -O1).
 122
 123          elsif Switch_Chars (First) = 'O' then
 124             if First = Last then
 125                Optimization_Level := 1;
 126
 127             elsif Last - First = 1 then
 128                if Switch_Chars (Last) = 's' then
 129                   Optimize_Size := 1;
 130                   Optimization_Level := 2;  -- Consistent with gcc setting
 131
 132                elsif Switch_Chars (Last) in '0' .. '3' then
 133                   Optimization_Level :=
 134                     Character'Pos (Switch_Chars (Last)) - Character'Pos ('0');
 135
 136                else
 137                   Fail ("invalid switch: " & Switch_Chars);
 138                end if;
 139
 140             else
 141                Fail ("invalid switch: " & Switch_Chars);
 142             end if;
 143
 144          elsif Switch_Chars (First .. Last) = "quiet" then
 145             return; -- ignore this switch
 146
 147          elsif Switch_Chars (First .. Last) = "c" then
 148             return; -- ignore this switch
 149
 150          --  The -x switch and its language name argument will generally be
 151          --  ignored by non-gcc back ends (e.g. the GNAAMP back end). In any
 152          --  case, we save the switch and argument in the compilation switches.
 153
 154          elsif Switch_Chars (First .. Last) = "x" then
 155             Lib.Store_Compilation_Switch (Switch_Chars);
 156             Next_Arg := Next_Arg + 1;
 157
 158             declare
 159                Argv : constant String := Args (Next_Arg).all;
 160
 161             begin
 162                if Is_Switch (Argv) then
 163                   Fail ("language name missing after -x");
 164                else
 165                   Lib.Store_Compilation_Switch (Argv);
 166                end if;
 167             end;
 168
 169             return;
 170
 171          --  Special check, the back end switch -fno-inline also sets the
 172          --  front end flag to entirely inhibit all inlining. So we store it
 173          --  and set the appropriate flag.
 174
 175          elsif Switch_Chars (First .. Last) = "fno-inline" then
 176             Lib.Store_Compilation_Switch (Switch_Chars);
 177             Opt.Suppress_All_Inlining := True;
 178             return;
 179
 180          --  Similar processing for -fpreserve-control-flow
 181
 182          elsif Switch_Chars (First .. Last) = "fpreserve-control-flow" then
 183             Lib.Store_Compilation_Switch (Switch_Chars);
 184             Opt.Suppress_Control_Flow_Optimizations := True;
 185             return;
 186
 187          --  Ignore all other back end switches
 188
 189          elsif Is_Back_End_Switch (Switch_Chars) then
 190             null;
 191
 192          --  Give error for junk switch
 193
 194          else
 195             Fail ("invalid switch: " & Switch_Chars);
 196          end if;
 197
 198          --  Store any other GCC switches
 199
 200          Lib.Store_Compilation_Switch (Switch_Chars);
 201       end Scan_Back_End_Switches;
 202
 203    --  Start of processing for Scan_Compiler_Args
 204
 205    begin
 206       --  Put all the arguments in argument list Args
 207
 208       for Arg in 1 .. Argument_Count loop
 209          declare
 210             Argv : String (1 .. Len_Arg (Arg));
 211          begin
 212             Fill_Arg (Argv'Address, Arg);
 213             Args (Arg) := new String'(Argv);
 214          end;
 215       end loop;
 216
 217       --  Loop through command line arguments, storing them for later access
 218
 219       while Next_Arg <= Argument_Count loop
 220          Look_At_Arg : declare
 221             Argv : constant String := Args (Next_Arg).all;
 222
 223          begin
 224             if Argv'Length = 0 then
 225                Fail ("Empty argument");
 226             end if;
 227
 228             --  If the previous switch has set the Output_File_Name_Present
 229             --  flag (that is we have seen a -gnatO), then the next argument
 230             --  is the name of the output object file.
 231
 232             if Opt.Output_File_Name_Present
 233               and then not Output_File_Name_Seen
 234             then
 235                if Is_Switch (Argv) then
 236                   Fail ("Object file name missing after -gnatO");
 237
 238                --  In SPARK_Mode, such an object file is never written, and the
 239                --  call to Set_Output_Object_File_Name may fail (e.g. when the
 240                --  object file name does not have the expected suffix). So we
 241                --  skip that call when SPARK_Mode is set.
 242
 243                elsif SPARK_Mode then
 244                   Output_File_Name_Seen := True;
 245
 246                else
 247                   Set_Output_Object_File_Name (Argv);
 248                   Output_File_Name_Seen := True;
 249                end if;
 250
 251                --  If the previous switch has set the Search_Directory_Present
 252                --  flag (that is if we have just seen -I), then the next
 253                --  argument is a search directory path.
 254
 255             elsif Search_Directory_Present then
 256                if Is_Switch (Argv) then
 257                   Fail ("search directory missing after -I");
 258                else
 259                   Add_Src_Search_Dir (Argv);
 260
 261                   --  Add directory to lib search so that back-end can take as
 262                   --  input ALI files if needed. Otherwise this won't have any
 263                   --  impact on the compiler.
 264
 265                   Add_Lib_Search_Dir (Argv);
 266
 267                   Search_Directory_Present := False;
 268                end if;
 269
 270             --  If not a switch, must be a file name
 271
 272             elsif not Is_Switch (Argv) then
 273                Add_File (Argv);
 274
 275             --  Front end switch
 276
 277             elsif Is_Front_End_Switch (Argv) then
 278                Scan_Front_End_Switches (Argv, Args, Next_Arg);
 279
 280             --  All non-front-end switches are back-end switches
 281
 282             else
 283                Scan_Back_End_Switches (Argv);
 284             end if;
 285          end Look_At_Arg;
 286
 287          Next_Arg := Next_Arg + 1;
 288       end loop;
 289    end Scan_Compiler_Arguments;
 290
 291 end Adabkend;