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) 1992-2011, 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    -- Full_Expander_Active --
  43    --------------------------
  44
  45    function Full_Expander_Active return Boolean is
  46    begin
  47       return Expander_Active and not Alfa_Mode;
  48    end Full_Expander_Active;
  49
  50    ----------------------------------
  51    -- Register_Opt_Config_Switches --
  52    ----------------------------------
  53
  54    procedure Register_Opt_Config_Switches is
  55    begin
  56       Ada_Version_Config                    := Ada_Version;
  57       Ada_Version_Explicit_Config           := Ada_Version_Explicit;
  58       Assertions_Enabled_Config             := Assertions_Enabled;
  59       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  60       Check_Policy_List_Config              := Check_Policy_List;
  61       Debug_Pragmas_Disabled_Config         := Debug_Pragmas_Disabled;
  62       Debug_Pragmas_Enabled_Config          := Debug_Pragmas_Enabled;
  63       Default_Pool_Config                   := Default_Pool;
  64       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  65       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
  66       Extensions_Allowed_Config             := Extensions_Allowed;
  67       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
  68       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
  69       Fast_Math_Config                      := Fast_Math;
  70       Initialize_Scalars_Config             := Initialize_Scalars;
  71       Optimize_Alignment_Config             := Optimize_Alignment;
  72       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  73       Polling_Required_Config               := Polling_Required;
  74       Short_Descriptors_Config              := Short_Descriptors;
  75       Use_VADS_Size_Config                  := Use_VADS_Size;
  76
  77       --  Reset the indication that Optimize_Alignment was set locally, since
  78       --  if we had a pragma in the config file, it would set this flag True,
  79       --  but that's not a local setting.
  80
  81       Optimize_Alignment_Local := False;
  82    end Register_Opt_Config_Switches;
  83
  84    ---------------------------------
  85    -- Restore_Opt_Config_Switches --
  86    ---------------------------------
  87
  88    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type) is
  89    begin
  90       Ada_Version                    := Save.Ada_Version;
  91       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
  92       Assertions_Enabled             := Save.Assertions_Enabled;
  93       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
  94       Check_Policy_List              := Save.Check_Policy_List;
  95       Debug_Pragmas_Disabled         := Save.Debug_Pragmas_Disabled;
  96       Debug_Pragmas_Enabled          := Save.Debug_Pragmas_Enabled;
  97       Default_Pool                   := Save.Default_Pool;
  98       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
  99       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
 100       Extensions_Allowed             := Save.Extensions_Allowed;
 101       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
 102       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
 103       Fast_Math                      := Save.Fast_Math;
 104       Initialize_Scalars             := Save.Initialize_Scalars;
 105       Optimize_Alignment             := Save.Optimize_Alignment;
 106       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
 107       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
 108       Polling_Required               := Save.Polling_Required;
 109       Short_Descriptors              := Save.Short_Descriptors;
 110       Use_VADS_Size                  := Save.Use_VADS_Size;
 111
 112       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 113       --  Normalize_Scalars is not saved/restored because after set to True its
 114       --  value is never changed. That is, if a compilation unit has pragma
 115       --  Normalize_Scalars then it forces that value for all with'ed units.
 116
 117       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 118    end Restore_Opt_Config_Switches;
 119
 120    ------------------------------
 121    -- Save_Opt_Config_Switches --
 122    ------------------------------
 123
 124    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type) is
 125    begin
 126       Save.Ada_Version                    := Ada_Version;
 127       Save.Ada_Version_Explicit           := Ada_Version_Explicit;
 128       Save.Assertions_Enabled             := Assertions_Enabled;
 129       Save.Assume_No_Invalid_Values       := Assume_No_Invalid_Values;
 130       Save.Check_Policy_List              := Check_Policy_List;
 131       Save.Debug_Pragmas_Disabled         := Debug_Pragmas_Disabled;
 132       Save.Debug_Pragmas_Enabled          := Debug_Pragmas_Enabled;
 133       Save.Default_Pool                   := Default_Pool;
 134       Save.Dynamic_Elaboration_Checks     := Dynamic_Elaboration_Checks;
 135       Save.Exception_Locations_Suppressed := Exception_Locations_Suppressed;
 136       Save.Extensions_Allowed             := Extensions_Allowed;
 137       Save.External_Name_Exp_Casing       := External_Name_Exp_Casing;
 138       Save.External_Name_Imp_Casing       := External_Name_Imp_Casing;
 139       Save.Fast_Math                      := Fast_Math;
 140       Save.Initialize_Scalars             := Initialize_Scalars;
 141       Save.Optimize_Alignment             := Optimize_Alignment;
 142       Save.Optimize_Alignment_Local       := Optimize_Alignment_Local;
 143       Save.Persistent_BSS_Mode            := Persistent_BSS_Mode;
 144       Save.Polling_Required               := Polling_Required;
 145       Save.Short_Descriptors              := Short_Descriptors;
 146       Save.Use_VADS_Size                  := Use_VADS_Size;
 147    end Save_Opt_Config_Switches;
 148
 149    -----------------------------
 150    -- Set_Opt_Config_Switches --
 151    -----------------------------
 152
 153    procedure Set_Opt_Config_Switches
 154      (Internal_Unit : Boolean;
 155       Main_Unit     : Boolean)
 156    is
 157    begin
 158       --  Case of internal unit
 159
 160       if Internal_Unit then
 161
 162          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 163          --  since the whole point of this is that it still properly indicates
 164          --  the configuration setting even in a run time unit.
 165
 166          Ada_Version                 := Ada_Version_Runtime;
 167          Dynamic_Elaboration_Checks  := False;
 168          Extensions_Allowed          := True;
 169          External_Name_Exp_Casing    := As_Is;
 170          External_Name_Imp_Casing    := Lowercase;
 171          Optimize_Alignment          := 'O';
 172          Persistent_BSS_Mode         := False;
 173          Use_VADS_Size               := False;
 174          Optimize_Alignment_Local    := True;
 175
 176          --  For an internal unit, assertions/debug pragmas are off unless this
 177          --  is the main unit and they were explicitly enabled. We also make
 178          --  sure we do not assume that values are necessarily valid.
 179
 180          if Main_Unit then
 181             Assertions_Enabled       := Assertions_Enabled_Config;
 182             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 183             Debug_Pragmas_Disabled   := Debug_Pragmas_Disabled_Config;
 184             Debug_Pragmas_Enabled    := Debug_Pragmas_Enabled_Config;
 185             Check_Policy_List        := Check_Policy_List_Config;
 186          else
 187             Assertions_Enabled       := False;
 188             Assume_No_Invalid_Values := False;
 189             Debug_Pragmas_Disabled   := False;
 190             Debug_Pragmas_Enabled    := False;
 191             Check_Policy_List        := Empty;
 192          end if;
 193
 194       --  Case of non-internal unit
 195
 196       else
 197          Ada_Version                 := Ada_Version_Config;
 198          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 199          Assertions_Enabled          := Assertions_Enabled_Config;
 200          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 201          Check_Policy_List           := Check_Policy_List_Config;
 202          Debug_Pragmas_Disabled      := Debug_Pragmas_Disabled_Config;
 203          Debug_Pragmas_Enabled       := Debug_Pragmas_Enabled_Config;
 204          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 205          Extensions_Allowed          := Extensions_Allowed_Config;
 206          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 207          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 208          Fast_Math                   := Fast_Math_Config;
 209          Initialize_Scalars          := Initialize_Scalars_Config;
 210          Optimize_Alignment          := Optimize_Alignment_Config;
 211          Optimize_Alignment_Local    := False;
 212          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 213          Use_VADS_Size               := Use_VADS_Size_Config;
 214
 215          --  Update consistently the value of Init_Or_Norm_Scalars. The value
 216          --  of Normalize_Scalars is not saved/restored because once set to
 217          --  True its value is never changed. That is, if a compilation unit
 218          --  has pragma Normalize_Scalars then it forces that value for all
 219          --  with'ed units.
 220
 221          Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 222       end if;
 223
 224       Default_Pool                   := Default_Pool_Config;
 225       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 226       Fast_Math                      := Fast_Math_Config;
 227       Optimize_Alignment             := Optimize_Alignment_Config;
 228       Polling_Required               := Polling_Required_Config;
 229       Short_Descriptors              := Short_Descriptors_Config;
 230    end Set_Opt_Config_Switches;
 231
 232    ---------------
 233    -- Tree_Read --
 234    ---------------
 235
 236    procedure Tree_Read is
 237       Tree_Version_String_Len         : Nat;
 238       Ada_Version_Config_Val          : Nat;
 239       Ada_Version_Explicit_Config_Val : Nat;
 240       Assertions_Enabled_Config_Val   : Nat;
 241
 242    begin
 243       Tree_Read_Int  (Tree_ASIS_Version_Number);
 244       Tree_Read_Bool (Brief_Output);
 245       Tree_Read_Bool (GNAT_Mode);
 246       Tree_Read_Char (Identifier_Character_Set);
 247       Tree_Read_Int  (Maximum_File_Name_Length);
 248       Tree_Read_Data (Suppress_Options'Address,
 249                       (Suppress_Options'Size + SU - 1) / SU);
 250       Tree_Read_Bool (Verbose_Mode);
 251       Tree_Read_Data (Warning_Mode'Address,
 252                       (Warning_Mode'Size + SU - 1) / SU);
 253       Tree_Read_Int  (Ada_Version_Config_Val);
 254       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 255       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 256       Tree_Read_Bool (All_Errors_Mode);
 257       Tree_Read_Bool (Assertions_Enabled);
 258       Tree_Read_Int  (Int (Check_Policy_List));
 259       Tree_Read_Bool (Debug_Pragmas_Disabled);
 260       Tree_Read_Bool (Debug_Pragmas_Enabled);
 261       Tree_Read_Int  (Int (Default_Pool));
 262       Tree_Read_Bool (Enable_Overflow_Checks);
 263       Tree_Read_Bool (Full_List);
 264
 265       Ada_Version_Config :=
 266         Ada_Version_Type'Val (Ada_Version_Config_Val);
 267       Ada_Version_Explicit_Config :=
 268         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 269       Assertions_Enabled_Config :=
 270         Boolean'Val (Assertions_Enabled_Config_Val);
 271
 272       --  Read version string: we have to get the length first
 273
 274       Tree_Read_Int (Tree_Version_String_Len);
 275
 276       declare
 277          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 278       begin
 279          Tree_Read_Data
 280            (Tmp'Address, Tree_Version_String_Len);
 281          System.Strings.Free (Tree_Version_String);
 282          Free (Tree_Version_String);
 283          Tree_Version_String := new String'(Tmp);
 284       end;
 285
 286       Tree_Read_Data (Distribution_Stub_Mode'Address,
 287                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 288       Tree_Read_Bool (Inline_Active);
 289       Tree_Read_Bool (Inline_Processing_Required);
 290       Tree_Read_Bool (List_Units);
 291       Tree_Read_Bool (Configurable_Run_Time_Mode);
 292       Tree_Read_Data (Operating_Mode'Address,
 293                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 294       Tree_Read_Bool (Suppress_Checks);
 295       Tree_Read_Bool (Try_Semantics);
 296       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 297                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 298       Tree_Read_Bool (Upper_Half_Encoding);
 299       Tree_Read_Bool (Force_ALI_Tree_File);
 300    end Tree_Read;
 301
 302    ----------------
 303    -- Tree_Write --
 304    ----------------
 305
 306    procedure Tree_Write is
 307       Version_String : String := Gnat_Version_String;
 308
 309    begin
 310       Tree_Write_Int  (ASIS_Version_Number);
 311       Tree_Write_Bool (Brief_Output);
 312       Tree_Write_Bool (GNAT_Mode);
 313       Tree_Write_Char (Identifier_Character_Set);
 314       Tree_Write_Int  (Maximum_File_Name_Length);
 315       Tree_Write_Data (Suppress_Options'Address,
 316                        (Suppress_Options'Size + SU - 1) / SU);
 317       Tree_Write_Bool (Verbose_Mode);
 318       Tree_Write_Data (Warning_Mode'Address,
 319                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 320       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 321       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 322       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 323       Tree_Write_Bool (All_Errors_Mode);
 324       Tree_Write_Bool (Assertions_Enabled);
 325       Tree_Write_Int  (Int (Check_Policy_List));
 326       Tree_Write_Bool (Debug_Pragmas_Disabled);
 327       Tree_Write_Bool (Debug_Pragmas_Enabled);
 328       Tree_Write_Int  (Int (Default_Pool));
 329       Tree_Write_Bool (Enable_Overflow_Checks);
 330       Tree_Write_Bool (Full_List);
 331       Tree_Write_Int  (Int (Version_String'Length));
 332       Tree_Write_Data (Version_String'Address, Version_String'Length);
 333       Tree_Write_Data (Distribution_Stub_Mode'Address,
 334                        (Distribution_Stub_Mode'Size + SU - 1) / SU);
 335       Tree_Write_Bool (Inline_Active);
 336       Tree_Write_Bool (Inline_Processing_Required);
 337       Tree_Write_Bool (List_Units);
 338       Tree_Write_Bool (Configurable_Run_Time_Mode);
 339       Tree_Write_Data (Operating_Mode'Address,
 340                        (Operating_Mode'Size + SU - 1) / SU);
 341       Tree_Write_Bool (Suppress_Checks);
 342       Tree_Write_Bool (Try_Semantics);
 343       Tree_Write_Data (Wide_Character_Encoding_Method'Address,
 344                        (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 345       Tree_Write_Bool (Upper_Half_Encoding);
 346       Tree_Write_Bool (Force_ALI_Tree_File);
 347    end Tree_Write;
 348
 349 end Opt;