gcc/ada/opt.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                  O P T                                   --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2008, 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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with Gnatvsn; use Gnatvsn;
  35 with System;  use System;
  36 with Tree_IO; use Tree_IO;
  37
  38 package body Opt is
  39
  40    SU : constant := Storage_Unit;
  41    --  Shorthand for System.Storage_Unit
  42
  43    ----------------------------------
  44    -- Register_Opt_Config_Switches --
  45    ----------------------------------
  46
  47    procedure Register_Opt_Config_Switches is
  48    begin
  49       Ada_Version_Config                    := Ada_Version;
  50       Ada_Version_Explicit_Config           := Ada_Version_Explicit;
  51       Assertions_Enabled_Config             := Assertions_Enabled;
  52       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  53       Check_Policy_List_Config              := Check_Policy_List;
  54       Debug_Pragmas_Enabled_Config          := Debug_Pragmas_Enabled;
  55       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  56       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
  57       Extensions_Allowed_Config             := Extensions_Allowed;
  58       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
  59       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
  60       Fast_Math_Config                      := Fast_Math;
  61       Optimize_Alignment_Config             := Optimize_Alignment;
  62       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  63       Polling_Required_Config               := Polling_Required;
  64       Use_VADS_Size_Config                  := Use_VADS_Size;
  65
  66       --  Reset the indication that Optimize_Alignment was set locally, since
  67       --  if we had a pragma in the config file, it would set this flag True,
  68       --  but that's not a local setting.
  69
  70       Optimize_Alignment_Local := False;
  71    end Register_Opt_Config_Switches;
  72
  73    ---------------------------------
  74    -- Restore_Opt_Config_Switches --
  75    ---------------------------------
  76
  77    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type) is
  78    begin
  79       Ada_Version                    := Save.Ada_Version;
  80       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
  81       Assertions_Enabled             := Save.Assertions_Enabled;
  82       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
  83       Check_Policy_List              := Save.Check_Policy_List;
  84       Debug_Pragmas_Enabled          := Save.Debug_Pragmas_Enabled;
  85       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
  86       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
  87       Extensions_Allowed             := Save.Extensions_Allowed;
  88       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
  89       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
  90       Fast_Math                      := Save.Fast_Math;
  91       Optimize_Alignment             := Save.Optimize_Alignment;
  92       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
  93       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
  94       Polling_Required               := Save.Polling_Required;
  95       Use_VADS_Size                  := Save.Use_VADS_Size;
  96    end Restore_Opt_Config_Switches;
  97
  98    ------------------------------
  99    -- Save_Opt_Config_Switches --
 100    ------------------------------
 101
 102    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type) is
 103    begin
 104       Save.Ada_Version                    := Ada_Version;
 105       Save.Ada_Version_Explicit           := Ada_Version_Explicit;
 106       Save.Assertions_Enabled             := Assertions_Enabled;
 107       Save.Assume_No_Invalid_Values       := Assume_No_Invalid_Values;
 108       Save.Check_Policy_List              := Check_Policy_List;
 109       Save.Debug_Pragmas_Enabled          := Debug_Pragmas_Enabled;
 110       Save.Dynamic_Elaboration_Checks     := Dynamic_Elaboration_Checks;
 111       Save.Exception_Locations_Suppressed := Exception_Locations_Suppressed;
 112       Save.Extensions_Allowed             := Extensions_Allowed;
 113       Save.External_Name_Exp_Casing       := External_Name_Exp_Casing;
 114       Save.External_Name_Imp_Casing       := External_Name_Imp_Casing;
 115       Save.Fast_Math                      := Fast_Math;
 116       Save.Optimize_Alignment             := Optimize_Alignment;
 117       Save.Optimize_Alignment_Local       := Optimize_Alignment_Local;
 118       Save.Persistent_BSS_Mode            := Persistent_BSS_Mode;
 119       Save.Polling_Required               := Polling_Required;
 120       Save.Use_VADS_Size                  := Use_VADS_Size;
 121    end Save_Opt_Config_Switches;
 122
 123    -----------------------------
 124    -- Set_Opt_Config_Switches --
 125    -----------------------------
 126
 127    procedure Set_Opt_Config_Switches
 128      (Internal_Unit : Boolean;
 129       Main_Unit     : Boolean)
 130    is
 131    begin
 132       --  Case of internal unit
 133
 134       if Internal_Unit then
 135
 136          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 137          --  since the whole point of this is that it still properly indicates
 138          --  the configuration setting even in a run time unit.
 139
 140          Ada_Version                 := Ada_Version_Runtime;
 141          Dynamic_Elaboration_Checks  := False;
 142          Extensions_Allowed          := True;
 143          External_Name_Exp_Casing    := As_Is;
 144          External_Name_Imp_Casing    := Lowercase;
 145          Optimize_Alignment          := 'O';
 146          Persistent_BSS_Mode         := False;
 147          Use_VADS_Size               := False;
 148          Optimize_Alignment_Local    := True;
 149
 150          --  For an internal unit, assertions/debug pragmas are off unless this
 151          --  is the main unit and they were explicitly enabled. We also make
 152          --  sure we do not assume that values are necessarily valid.
 153
 154          if Main_Unit then
 155             Assertions_Enabled       := Assertions_Enabled_Config;
 156             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 157             Debug_Pragmas_Enabled    := Debug_Pragmas_Enabled_Config;
 158             Check_Policy_List        := Check_Policy_List_Config;
 159          else
 160             Assertions_Enabled       := False;
 161             Assume_No_Invalid_Values := False;
 162             Debug_Pragmas_Enabled    := False;
 163             Check_Policy_List        := Empty;
 164          end if;
 165
 166       --  Case of non-internal unit
 167
 168       else
 169          Ada_Version                 := Ada_Version_Config;
 170          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 171          Assertions_Enabled          := Assertions_Enabled_Config;
 172          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 173          Check_Policy_List           := Check_Policy_List_Config;
 174          Debug_Pragmas_Enabled       := Debug_Pragmas_Enabled_Config;
 175          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 176          Extensions_Allowed          := Extensions_Allowed_Config;
 177          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 178          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 179          Fast_Math                   := Fast_Math_Config;
 180          Optimize_Alignment          := Optimize_Alignment_Config;
 181          Optimize_Alignment_Local    := False;
 182          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 183          Use_VADS_Size               := Use_VADS_Size_Config;
 184       end if;
 185
 186       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 187       Fast_Math                      := Fast_Math_Config;
 188       Optimize_Alignment             := Optimize_Alignment_Config;
 189       Polling_Required               := Polling_Required_Config;
 190    end Set_Opt_Config_Switches;
 191
 192    ---------------
 193    -- Tree_Read --
 194    ---------------
 195
 196    procedure Tree_Read is
 197       Tree_Version_String_Len         : Nat;
 198       Ada_Version_Config_Val          : Nat;
 199       Ada_Version_Explicit_Config_Val : Nat;
 200       Assertions_Enabled_Config_Val   : Nat;
 201
 202    begin
 203       Tree_Read_Int  (Tree_ASIS_Version_Number);
 204       Tree_Read_Bool (Brief_Output);
 205       Tree_Read_Bool (GNAT_Mode);
 206       Tree_Read_Char (Identifier_Character_Set);
 207       Tree_Read_Int  (Maximum_File_Name_Length);
 208       Tree_Read_Data (Suppress_Options'Address,
 209                       (Suppress_Options'Size + SU - 1) / SU);
 210       Tree_Read_Bool (Verbose_Mode);
 211       Tree_Read_Data (Warning_Mode'Address,
 212                       (Warning_Mode'Size + SU - 1) / SU);
 213       Tree_Read_Int  (Ada_Version_Config_Val);
 214       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 215       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 216       Tree_Read_Bool (All_Errors_Mode);
 217       Tree_Read_Bool (Assertions_Enabled);
 218       Tree_Read_Int  (Int (Check_Policy_List));
 219       Tree_Read_Bool (Debug_Pragmas_Enabled);
 220       Tree_Read_Bool (Enable_Overflow_Checks);
 221       Tree_Read_Bool (Full_List);
 222
 223       Ada_Version_Config :=
 224         Ada_Version_Type'Val (Ada_Version_Config_Val);
 225       Ada_Version_Explicit_Config :=
 226         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 227       Assertions_Enabled_Config :=
 228         Boolean'Val (Assertions_Enabled_Config_Val);
 229
 230       --  Read version string: we have to get the length first
 231
 232       Tree_Read_Int (Tree_Version_String_Len);
 233
 234       declare
 235          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 236       begin
 237          Tree_Read_Data
 238            (Tmp'Address, Tree_Version_String_Len);
 239          System.Strings.Free (Tree_Version_String);
 240          Free (Tree_Version_String);
 241          Tree_Version_String := new String'(Tmp);
 242       end;
 243
 244       Tree_Read_Data (Distribution_Stub_Mode'Address,
 245                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 246       Tree_Read_Bool (Inline_Active);
 247       Tree_Read_Bool (Inline_Processing_Required);
 248       Tree_Read_Bool (List_Units);
 249       Tree_Read_Bool (Configurable_Run_Time_Mode);
 250       Tree_Read_Data (Operating_Mode'Address,
 251                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 252       Tree_Read_Bool (Suppress_Checks);
 253       Tree_Read_Bool (Try_Semantics);
 254       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 255                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 256       Tree_Read_Bool (Upper_Half_Encoding);
 257       Tree_Read_Bool (Force_ALI_Tree_File);
 258    end Tree_Read;
 259
 260    ----------------
 261    -- Tree_Write --
 262    ----------------
 263
 264    procedure Tree_Write is
 265       Version_String : String := Gnat_Version_String;
 266
 267    begin
 268       Tree_Write_Int  (ASIS_Version_Number);
 269       Tree_Write_Bool (Brief_Output);
 270       Tree_Write_Bool (GNAT_Mode);
 271       Tree_Write_Char (Identifier_Character_Set);
 272       Tree_Write_Int  (Maximum_File_Name_Length);
 273       Tree_Write_Data (Suppress_Options'Address,
 274                        (Suppress_Options'Size + SU - 1) / SU);
 275       Tree_Write_Bool (Verbose_Mode);
 276       Tree_Write_Data (Warning_Mode'Address,
 277                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 278       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 279       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 280       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 281       Tree_Write_Bool (All_Errors_Mode);
 282       Tree_Write_Bool (Assertions_Enabled);
 283       Tree_Write_Int  (Int (Check_Policy_List));
 284       Tree_Write_Bool (Debug_Pragmas_Enabled);
 285       Tree_Write_Bool (Enable_Overflow_Checks);
 286       Tree_Write_Bool (Full_List);
 287       Tree_Write_Int  (Int (Version_String'Length));
 288       Tree_Write_Data (Version_String'Address, Version_String'Length);
 289       Tree_Write_Data (Distribution_Stub_Mode'Address,
 290                        (Distribution_Stub_Mode'Size + SU - 1) / SU);
 291       Tree_Write_Bool (Inline_Active);
 292       Tree_Write_Bool (Inline_Processing_Required);
 293       Tree_Write_Bool (List_Units);
 294       Tree_Write_Bool (Configurable_Run_Time_Mode);
 295       Tree_Write_Data (Operating_Mode'Address,
 296                        (Operating_Mode'Size + SU - 1) / SU);
 297       Tree_Write_Bool (Suppress_Checks);
 298       Tree_Write_Bool (Try_Semantics);
 299       Tree_Write_Data (Wide_Character_Encoding_Method'Address,
 300                        (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 301       Tree_Write_Bool (Upper_Half_Encoding);
 302       Tree_Write_Bool (Force_ALI_Tree_File);
 303    end Tree_Write;
 304
 305 end Opt;