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) 1992-2009, 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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 with Gnatvsn; use Gnatvsn;
  33 with System;  use System;
  34 with Tree_IO; use Tree_IO;
  35
  36 package body Opt is
  37
  38    SU : constant := Storage_Unit;
  39    --  Shorthand for System.Storage_Unit
  40
  41    ----------------------------------
  42    -- Register_Opt_Config_Switches --
  43    ----------------------------------
  44
  45    procedure Register_Opt_Config_Switches is
  46    begin
  47       Ada_Version_Config                    := Ada_Version;
  48       Ada_Version_Explicit_Config           := Ada_Version_Explicit;
  49       Assertions_Enabled_Config             := Assertions_Enabled;
  50       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  51       Check_Policy_List_Config              := Check_Policy_List;
  52       Debug_Pragmas_Enabled_Config          := Debug_Pragmas_Enabled;
  53       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  54       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
  55       Extensions_Allowed_Config             := Extensions_Allowed;
  56       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
  57       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
  58       Fast_Math_Config                      := Fast_Math;
  59       Optimize_Alignment_Config             := Optimize_Alignment;
  60       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  61       Polling_Required_Config               := Polling_Required;
  62       Use_VADS_Size_Config                  := Use_VADS_Size;
  63
  64       --  Reset the indication that Optimize_Alignment was set locally, since
  65       --  if we had a pragma in the config file, it would set this flag True,
  66       --  but that's not a local setting.
  67
  68       Optimize_Alignment_Local := False;
  69    end Register_Opt_Config_Switches;
  70
  71    ---------------------------------
  72    -- Restore_Opt_Config_Switches --
  73    ---------------------------------
  74
  75    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type) is
  76    begin
  77       Ada_Version                    := Save.Ada_Version;
  78       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
  79       Assertions_Enabled             := Save.Assertions_Enabled;
  80       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
  81       Check_Policy_List              := Save.Check_Policy_List;
  82       Debug_Pragmas_Enabled          := Save.Debug_Pragmas_Enabled;
  83       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
  84       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
  85       Extensions_Allowed             := Save.Extensions_Allowed;
  86       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
  87       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
  88       Fast_Math                      := Save.Fast_Math;
  89       Optimize_Alignment             := Save.Optimize_Alignment;
  90       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
  91       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
  92       Polling_Required               := Save.Polling_Required;
  93       Use_VADS_Size                  := Save.Use_VADS_Size;
  94    end Restore_Opt_Config_Switches;
  95
  96    ------------------------------
  97    -- Save_Opt_Config_Switches --
  98    ------------------------------
  99
 100    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type) is
 101    begin
 102       Save.Ada_Version                    := Ada_Version;
 103       Save.Ada_Version_Explicit           := Ada_Version_Explicit;
 104       Save.Assertions_Enabled             := Assertions_Enabled;
 105       Save.Assume_No_Invalid_Values       := Assume_No_Invalid_Values;
 106       Save.Check_Policy_List              := Check_Policy_List;
 107       Save.Debug_Pragmas_Enabled          := Debug_Pragmas_Enabled;
 108       Save.Dynamic_Elaboration_Checks     := Dynamic_Elaboration_Checks;
 109       Save.Exception_Locations_Suppressed := Exception_Locations_Suppressed;
 110       Save.Extensions_Allowed             := Extensions_Allowed;
 111       Save.External_Name_Exp_Casing       := External_Name_Exp_Casing;
 112       Save.External_Name_Imp_Casing       := External_Name_Imp_Casing;
 113       Save.Fast_Math                      := Fast_Math;
 114       Save.Optimize_Alignment             := Optimize_Alignment;
 115       Save.Optimize_Alignment_Local       := Optimize_Alignment_Local;
 116       Save.Persistent_BSS_Mode            := Persistent_BSS_Mode;
 117       Save.Polling_Required               := Polling_Required;
 118       Save.Use_VADS_Size                  := Use_VADS_Size;
 119    end Save_Opt_Config_Switches;
 120
 121    -----------------------------
 122    -- Set_Opt_Config_Switches --
 123    -----------------------------
 124
 125    procedure Set_Opt_Config_Switches
 126      (Internal_Unit : Boolean;
 127       Main_Unit     : Boolean)
 128    is
 129    begin
 130       --  Case of internal unit
 131
 132       if Internal_Unit then
 133
 134          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 135          --  since the whole point of this is that it still properly indicates
 136          --  the configuration setting even in a run time unit.
 137
 138          Ada_Version                 := Ada_Version_Runtime;
 139          Dynamic_Elaboration_Checks  := False;
 140          Extensions_Allowed          := True;
 141          External_Name_Exp_Casing    := As_Is;
 142          External_Name_Imp_Casing    := Lowercase;
 143          Optimize_Alignment          := 'O';
 144          Persistent_BSS_Mode         := False;
 145          Use_VADS_Size               := False;
 146          Optimize_Alignment_Local    := True;
 147
 148          --  For an internal unit, assertions/debug pragmas are off unless this
 149          --  is the main unit and they were explicitly enabled. We also make
 150          --  sure we do not assume that values are necessarily valid.
 151
 152          if Main_Unit then
 153             Assertions_Enabled       := Assertions_Enabled_Config;
 154             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 155             Debug_Pragmas_Enabled    := Debug_Pragmas_Enabled_Config;
 156             Check_Policy_List        := Check_Policy_List_Config;
 157          else
 158             Assertions_Enabled       := False;
 159             Assume_No_Invalid_Values := False;
 160             Debug_Pragmas_Enabled    := False;
 161             Check_Policy_List        := Empty;
 162          end if;
 163
 164       --  Case of non-internal unit
 165
 166       else
 167          Ada_Version                 := Ada_Version_Config;
 168          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 169          Assertions_Enabled          := Assertions_Enabled_Config;
 170          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 171          Check_Policy_List           := Check_Policy_List_Config;
 172          Debug_Pragmas_Enabled       := Debug_Pragmas_Enabled_Config;
 173          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 174          Extensions_Allowed          := Extensions_Allowed_Config;
 175          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 176          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 177          Fast_Math                   := Fast_Math_Config;
 178          Optimize_Alignment          := Optimize_Alignment_Config;
 179          Optimize_Alignment_Local    := False;
 180          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 181          Use_VADS_Size               := Use_VADS_Size_Config;
 182       end if;
 183
 184       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 185       Fast_Math                      := Fast_Math_Config;
 186       Optimize_Alignment             := Optimize_Alignment_Config;
 187       Polling_Required               := Polling_Required_Config;
 188    end Set_Opt_Config_Switches;
 189
 190    ---------------
 191    -- Tree_Read --
 192    ---------------
 193
 194    procedure Tree_Read is
 195       Tree_Version_String_Len         : Nat;
 196       Ada_Version_Config_Val          : Nat;
 197       Ada_Version_Explicit_Config_Val : Nat;
 198       Assertions_Enabled_Config_Val   : Nat;
 199
 200    begin
 201       Tree_Read_Int  (Tree_ASIS_Version_Number);
 202       Tree_Read_Bool (Brief_Output);
 203       Tree_Read_Bool (GNAT_Mode);
 204       Tree_Read_Char (Identifier_Character_Set);
 205       Tree_Read_Int  (Maximum_File_Name_Length);
 206       Tree_Read_Data (Suppress_Options'Address,
 207                       (Suppress_Options'Size + SU - 1) / SU);
 208       Tree_Read_Bool (Verbose_Mode);
 209       Tree_Read_Data (Warning_Mode'Address,
 210                       (Warning_Mode'Size + SU - 1) / SU);
 211       Tree_Read_Int  (Ada_Version_Config_Val);
 212       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 213       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 214       Tree_Read_Bool (All_Errors_Mode);
 215       Tree_Read_Bool (Assertions_Enabled);
 216       Tree_Read_Int  (Int (Check_Policy_List));
 217       Tree_Read_Bool (Debug_Pragmas_Enabled);
 218       Tree_Read_Bool (Enable_Overflow_Checks);
 219       Tree_Read_Bool (Full_List);
 220
 221       Ada_Version_Config :=
 222         Ada_Version_Type'Val (Ada_Version_Config_Val);
 223       Ada_Version_Explicit_Config :=
 224         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 225       Assertions_Enabled_Config :=
 226         Boolean'Val (Assertions_Enabled_Config_Val);
 227
 228       --  Read version string: we have to get the length first
 229
 230       Tree_Read_Int (Tree_Version_String_Len);
 231
 232       declare
 233          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 234       begin
 235          Tree_Read_Data
 236            (Tmp'Address, Tree_Version_String_Len);
 237          System.Strings.Free (Tree_Version_String);
 238          Free (Tree_Version_String);
 239          Tree_Version_String := new String'(Tmp);
 240       end;
 241
 242       Tree_Read_Data (Distribution_Stub_Mode'Address,
 243                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 244       Tree_Read_Bool (Inline_Active);
 245       Tree_Read_Bool (Inline_Processing_Required);
 246       Tree_Read_Bool (List_Units);
 247       Tree_Read_Bool (Configurable_Run_Time_Mode);
 248       Tree_Read_Data (Operating_Mode'Address,
 249                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 250       Tree_Read_Bool (Suppress_Checks);
 251       Tree_Read_Bool (Try_Semantics);
 252       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 253                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 254       Tree_Read_Bool (Upper_Half_Encoding);
 255       Tree_Read_Bool (Force_ALI_Tree_File);
 256    end Tree_Read;
 257
 258    ----------------
 259    -- Tree_Write --
 260    ----------------
 261
 262    procedure Tree_Write is
 263       Version_String : String := Gnat_Version_String;
 264
 265    begin
 266       Tree_Write_Int  (ASIS_Version_Number);
 267       Tree_Write_Bool (Brief_Output);
 268       Tree_Write_Bool (GNAT_Mode);
 269       Tree_Write_Char (Identifier_Character_Set);
 270       Tree_Write_Int  (Maximum_File_Name_Length);
 271       Tree_Write_Data (Suppress_Options'Address,
 272                        (Suppress_Options'Size + SU - 1) / SU);
 273       Tree_Write_Bool (Verbose_Mode);
 274       Tree_Write_Data (Warning_Mode'Address,
 275                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 276       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 277       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 278       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 279       Tree_Write_Bool (All_Errors_Mode);
 280       Tree_Write_Bool (Assertions_Enabled);
 281       Tree_Write_Int  (Int (Check_Policy_List));
 282       Tree_Write_Bool (Debug_Pragmas_Enabled);
 283       Tree_Write_Bool (Enable_Overflow_Checks);
 284       Tree_Write_Bool (Full_List);
 285       Tree_Write_Int  (Int (Version_String'Length));
 286       Tree_Write_Data (Version_String'Address, Version_String'Length);
 287       Tree_Write_Data (Distribution_Stub_Mode'Address,
 288                        (Distribution_Stub_Mode'Size + SU - 1) / SU);
 289       Tree_Write_Bool (Inline_Active);
 290       Tree_Write_Bool (Inline_Processing_Required);
 291       Tree_Write_Bool (List_Units);
 292       Tree_Write_Bool (Configurable_Run_Time_Mode);
 293       Tree_Write_Data (Operating_Mode'Address,
 294                        (Operating_Mode'Size + SU - 1) / SU);
 295       Tree_Write_Bool (Suppress_Checks);
 296       Tree_Write_Bool (Try_Semantics);
 297       Tree_Write_Data (Wide_Character_Encoding_Method'Address,
 298                        (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 299       Tree_Write_Bool (Upper_Half_Encoding);
 300       Tree_Write_Bool (Force_ALI_Tree_File);
 301    end Tree_Write;
 302
 303 end Opt;