gcc/ada/back_end.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                            B A C K _ E N D                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2003 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 2,  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 COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 with Atree;     use Atree;
  28 with Debug;     use Debug;
  29 with Elists;    use Elists;
  30 with Lib;       use Lib;
  31 with Osint;     use Osint;
  32 with Opt;       use Opt;
  33 with Osint;     use Osint;
  34 with Osint.C;   use Osint.C;
  35 with Namet;     use Namet;
  36 with Nlists;    use Nlists;
  37 with Stand;     use Stand;
  38 with Sinput;    use Sinput;
  39 with Stringt;   use Stringt;
  40 with Switch;    use Switch;
  41 with Switch.C;  use Switch.C;
  42 with System;    use System;
  43 with Types;     use Types;
  44
  45 package body Back_End is
  46
  47    -------------------
  48    -- Call_Back_End --
  49    -------------------
  50
  51    procedure Call_Back_End (Mode : Back_End_Mode_Type) is
  52
  53       --  The File_Record type has a lot of components that are meaningless
  54       --  to the back end, so a new record is created here to contain the
  55       --  needed information for each file.
  56
  57       type Needed_File_Info_Type is record
  58          File_Name        : File_Name_Type;
  59          First_Sloc       : Source_Ptr;
  60          Last_Sloc        : Source_Ptr;
  61          Num_Source_Lines : Nat;
  62       end record;
  63
  64       File_Info_Array :
  65         array (Main_Unit .. Last_Unit) of Needed_File_Info_Type;
  66
  67       procedure gigi (
  68          gnat_root                     : Int;
  69          max_gnat_node                 : Int;
  70          number_name                   : Nat;
  71          nodes_ptr                     : Address;
  72
  73          next_node_ptr                 : Address;
  74          prev_node_ptr                 : Address;
  75          elists_ptr                    : Address;
  76          elmts_ptr                     : Address;
  77
  78          strings_ptr                   : Address;
  79          string_chars_ptr              : Address;
  80          list_headers_ptr              : Address;
  81          number_units                  : Int;
  82
  83          file_info_ptr                 : Address;
  84          gigi_standard_integer         : Entity_Id;
  85          gigi_standard_long_long_float : Entity_Id;
  86          gigi_standard_exception_type  : Entity_Id;
  87          gigi_operating_mode           : Back_End_Mode_Type);
  88
  89       pragma Import (C, gigi);
  90
  91       S : Source_File_Index;
  92
  93    begin
  94       --  Skip call if in -gnatdH mode
  95
  96       if Debug_Flag_HH then
  97          return;
  98       end if;
  99
 100       for J in Main_Unit .. Last_Unit loop
 101          S := Source_Index (J);
 102          File_Info_Array (J).File_Name        := File_Name (S);
 103          File_Info_Array (J).First_Sloc       := Source_Text (S)'First;
 104          File_Info_Array (J).Last_Sloc        := Source_Text (S)'Last;
 105          File_Info_Array (J).Num_Source_Lines := Num_Source_Lines (S);
 106       end loop;
 107
 108       gigi (
 109          gnat_root          => Int (Cunit (Main_Unit)),
 110          max_gnat_node      => Int (Last_Node_Id - First_Node_Id + 1),
 111          number_name        => Name_Entries_Count,
 112          nodes_ptr          => Nodes_Address,
 113
 114          next_node_ptr      => Next_Node_Address,
 115          prev_node_ptr      => Prev_Node_Address,
 116          elists_ptr         => Elists_Address,
 117          elmts_ptr          => Elmts_Address,
 118
 119          strings_ptr        => Strings_Address,
 120          string_chars_ptr   => String_Chars_Address,
 121          list_headers_ptr   => Lists_Address,
 122          number_units       => Num_Units,
 123
 124          file_info_ptr                 => File_Info_Array'Address,
 125          gigi_standard_integer         => Standard_Integer,
 126          gigi_standard_long_long_float => Standard_Long_Long_Float,
 127          gigi_standard_exception_type  => Standard_Exception_Type,
 128          gigi_operating_mode           => Mode);
 129    end Call_Back_End;
 130
 131    -----------------------------
 132    -- Scan_Compiler_Arguments --
 133    -----------------------------
 134
 135    procedure Scan_Compiler_Arguments is
 136
 137       Next_Arg : Pos := 1;
 138
 139       subtype Big_String is String (Positive);
 140       type BSP is access Big_String;
 141
 142       type Arg_Array is array (Nat) of BSP;
 143       type Arg_Array_Ptr is access Arg_Array;
 144
 145       --  Import flag_stack_check from toplev.c.
 146
 147       flag_stack_check : Int;
 148       pragma Import (C, flag_stack_check); -- Import from toplev.c
 149
 150       save_argc : Nat;
 151       pragma Import (C, save_argc); -- Import from toplev.c
 152
 153       save_argv : Arg_Array_Ptr;
 154       pragma Import (C, save_argv); -- Import from toplev.c
 155
 156       Output_File_Name_Seen : Boolean := False;
 157       --  Set to True after having scanned the file_name for
 158       --  switch "-gnatO file_name"
 159
 160       --  Local functions
 161
 162       function Len_Arg (Arg : Pos) return Nat;
 163       --  Determine length of argument number Arg on the original
 164       --  command line from gnat1
 165
 166       procedure Scan_Back_End_Switches (Switch_Chars : String);
 167       --  Procedure to scan out switches stored in Switch_Chars. The first
 168       --  character is known to be a valid switch character, and there are no
 169       --  blanks or other switch terminator characters in the string, so the
 170       --  entire string should consist of valid switch characters, except that
 171       --  an optional terminating NUL character is allowed.
 172       --
 173       --  Back end switches have already been checked and processed by GCC
 174       --  in toplev.c, so no errors can occur and control will always return.
 175       --  The switches must still be scanned to skip the arguments of the
 176       --  "-o" or the (undocumented) "-dumpbase" switch, by incrementing
 177       --  the Next_Arg variable. The "-dumpbase" switch is used to set the
 178       --  basename for GCC dumpfiles.
 179
 180       -------------
 181       -- Len_Arg --
 182       -------------
 183
 184       function Len_Arg (Arg : Pos) return Nat is
 185       begin
 186          for J in 1 .. Nat'Last loop
 187             if save_argv (Arg).all (Natural (J)) = ASCII.NUL then
 188                return J - 1;
 189             end if;
 190          end loop;
 191
 192          raise Program_Error;
 193       end Len_Arg;
 194
 195       ----------------------------
 196       -- Scan_Back_End_Switches --
 197       ----------------------------
 198
 199       procedure Scan_Back_End_Switches (Switch_Chars : String) is
 200          First : constant Positive := Switch_Chars'First + 1;
 201          Last  : Natural := Switch_Chars'Last;
 202
 203       begin
 204          if Last >= First
 205            and then Switch_Chars (Last) = ASCII.NUL
 206          then
 207             Last := Last - 1;
 208          end if;
 209
 210          --  For dumpbase and o, skip following argument and do not
 211          --  store either the switch or the following argument
 212
 213          if Switch_Chars (First .. Last) = "o"
 214             or else Switch_Chars (First .. Last) = "dumpbase"
 215
 216          then
 217             Next_Arg := Next_Arg + 1;
 218
 219          --  Do not record -quiet switch
 220
 221          elsif Switch_Chars (First .. Last) = "quiet" then
 222             null;
 223
 224          else
 225             --  Store any other GCC switches
 226
 227             Store_Compilation_Switch (Switch_Chars);
 228          end if;
 229       end Scan_Back_End_Switches;
 230
 231    --  Start of processing for Scan_Compiler_Arguments
 232
 233    begin
 234       --  Acquire stack checking mode directly from GCC
 235
 236       Opt.Stack_Checking_Enabled := (flag_stack_check /= 0);
 237
 238       --  Loop through command line arguments, storing them for later access
 239
 240       while Next_Arg < save_argc loop
 241
 242          Look_At_Arg : declare
 243             Argv_Ptr  : constant BSP    := save_argv (Next_Arg);
 244             Argv_Len  : constant Nat    := Len_Arg (Next_Arg);
 245             Argv      : constant String := Argv_Ptr (1 .. Natural (Argv_Len));
 246
 247          begin
 248             --  If the previous switch has set the Output_File_Name_Present
 249             --  flag (that is we have seen a -gnatO), then the next argument
 250             --  is the name of the output object file.
 251
 252             if Output_File_Name_Present
 253               and then not Output_File_Name_Seen
 254             then
 255                if Is_Switch (Argv) then
 256                   Fail ("Object file name missing after -gnatO");
 257
 258                else
 259                   Set_Output_Object_File_Name (Argv);
 260                   Output_File_Name_Seen := True;
 261                end if;
 262
 263             elsif not Is_Switch (Argv) then -- must be a file name
 264                Add_File (Argv);
 265
 266             --  We must recognize -nostdinc to suppress visibility on the
 267             --  standard GNAT RTL sources. This is also a gcc switch.
 268
 269             elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdinc" then
 270                Opt.No_Stdinc := True;
 271                Scan_Back_End_Switches (Argv);
 272
 273             --  We must recognize -nostdlib to suppress visibility on the
 274             --  standard GNAT RTL objects.
 275
 276             elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdlib" then
 277                Opt.No_Stdlib := True;
 278
 279             elsif Is_Front_End_Switch (Argv) then
 280                Scan_Front_End_Switches (Argv);
 281
 282             --  All non-front-end switches are back-end switches
 283
 284             else
 285                Scan_Back_End_Switches (Argv);
 286             end if;
 287          end Look_At_Arg;
 288
 289          Next_Arg := Next_Arg + 1;
 290       end loop;
 291    end Scan_Compiler_Arguments;
 292
 293 end Back_End;