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) 1992-2012, 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_Float_Overflow_Config           := Check_Float_Overflow;
  61       Check_Policy_List_Config              := Check_Policy_List;
  62       Debug_Pragmas_Disabled_Config         := Debug_Pragmas_Disabled;
  63       Debug_Pragmas_Enabled_Config          := Debug_Pragmas_Enabled;
  64       Default_Pool_Config                   := Default_Pool;
  65       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  66       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
  67       Extensions_Allowed_Config             := Extensions_Allowed;
  68       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
  69       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
  70       Fast_Math_Config                      := Fast_Math;
  71       Initialize_Scalars_Config             := Initialize_Scalars;
  72       Optimize_Alignment_Config             := Optimize_Alignment;
  73       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  74       Polling_Required_Config               := Polling_Required;
  75       Short_Descriptors_Config              := Short_Descriptors;
  76       Use_VADS_Size_Config                  := Use_VADS_Size;
  77
  78       --  Reset the indication that Optimize_Alignment was set locally, since
  79       --  if we had a pragma in the config file, it would set this flag True,
  80       --  but that's not a local setting.
  81
  82       Optimize_Alignment_Local := False;
  83    end Register_Opt_Config_Switches;
  84
  85    ---------------------------------
  86    -- Restore_Opt_Config_Switches --
  87    ---------------------------------
  88
  89    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type) is
  90    begin
  91       Ada_Version                    := Save.Ada_Version;
  92       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
  93       Assertions_Enabled             := Save.Assertions_Enabled;
  94       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
  95       Check_Float_Overflow           := Save.Check_Float_Overflow;
  96       Check_Policy_List              := Save.Check_Policy_List;
  97       Debug_Pragmas_Disabled         := Save.Debug_Pragmas_Disabled;
  98       Debug_Pragmas_Enabled          := Save.Debug_Pragmas_Enabled;
  99       Default_Pool                   := Save.Default_Pool;
 100       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
 101       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
 102       Extensions_Allowed             := Save.Extensions_Allowed;
 103       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
 104       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
 105       Fast_Math                      := Save.Fast_Math;
 106       Initialize_Scalars             := Save.Initialize_Scalars;
 107       Optimize_Alignment             := Save.Optimize_Alignment;
 108       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
 109       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
 110       Polling_Required               := Save.Polling_Required;
 111       Short_Descriptors              := Save.Short_Descriptors;
 112       Use_VADS_Size                  := Save.Use_VADS_Size;
 113
 114       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 115       --  Normalize_Scalars is not saved/restored because after set to True its
 116       --  value is never changed. That is, if a compilation unit has pragma
 117       --  Normalize_Scalars then it forces that value for all with'ed units.
 118
 119       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 120    end Restore_Opt_Config_Switches;
 121
 122    ------------------------------
 123    -- Save_Opt_Config_Switches --
 124    ------------------------------
 125
 126    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type) is
 127    begin
 128       Save.Ada_Version                    := Ada_Version;
 129       Save.Ada_Version_Explicit           := Ada_Version_Explicit;
 130       Save.Assertions_Enabled             := Assertions_Enabled;
 131       Save.Assume_No_Invalid_Values       := Assume_No_Invalid_Values;
 132       Save.Check_Float_Overflow           := Check_Float_Overflow;
 133       Save.Check_Policy_List              := Check_Policy_List;
 134       Save.Debug_Pragmas_Disabled         := Debug_Pragmas_Disabled;
 135       Save.Debug_Pragmas_Enabled          := Debug_Pragmas_Enabled;
 136       Save.Default_Pool                   := Default_Pool;
 137       Save.Dynamic_Elaboration_Checks     := Dynamic_Elaboration_Checks;
 138       Save.Exception_Locations_Suppressed := Exception_Locations_Suppressed;
 139       Save.Extensions_Allowed             := Extensions_Allowed;
 140       Save.External_Name_Exp_Casing       := External_Name_Exp_Casing;
 141       Save.External_Name_Imp_Casing       := External_Name_Imp_Casing;
 142       Save.Fast_Math                      := Fast_Math;
 143       Save.Initialize_Scalars             := Initialize_Scalars;
 144       Save.Optimize_Alignment             := Optimize_Alignment;
 145       Save.Optimize_Alignment_Local       := Optimize_Alignment_Local;
 146       Save.Persistent_BSS_Mode            := Persistent_BSS_Mode;
 147       Save.Polling_Required               := Polling_Required;
 148       Save.Short_Descriptors              := Short_Descriptors;
 149       Save.Use_VADS_Size                  := Use_VADS_Size;
 150    end Save_Opt_Config_Switches;
 151
 152    -----------------------------
 153    -- Set_Opt_Config_Switches --
 154    -----------------------------
 155
 156    procedure Set_Opt_Config_Switches
 157      (Internal_Unit : Boolean;
 158       Main_Unit     : Boolean)
 159    is
 160    begin
 161       --  Case of internal unit
 162
 163       if Internal_Unit then
 164
 165          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 166          --  since the whole point of this is that it still properly indicates
 167          --  the configuration setting even in a run time unit.
 168
 169          Ada_Version                 := Ada_Version_Runtime;
 170          Dynamic_Elaboration_Checks  := False;
 171          Extensions_Allowed          := True;
 172          External_Name_Exp_Casing    := As_Is;
 173          External_Name_Imp_Casing    := Lowercase;
 174          Optimize_Alignment          := 'O';
 175          Persistent_BSS_Mode         := False;
 176          Use_VADS_Size               := False;
 177          Optimize_Alignment_Local    := True;
 178
 179          --  For an internal unit, assertions/debug pragmas are off unless this
 180          --  is the main unit and they were explicitly enabled. We also make
 181          --  sure we do not assume that values are necessarily valid.
 182
 183          if Main_Unit then
 184             Assertions_Enabled       := Assertions_Enabled_Config;
 185             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 186             Debug_Pragmas_Disabled   := Debug_Pragmas_Disabled_Config;
 187             Debug_Pragmas_Enabled    := Debug_Pragmas_Enabled_Config;
 188             Check_Policy_List        := Check_Policy_List_Config;
 189          else
 190             Assertions_Enabled       := False;
 191             Assume_No_Invalid_Values := False;
 192             Debug_Pragmas_Disabled   := False;
 193             Debug_Pragmas_Enabled    := False;
 194             Check_Policy_List        := Empty;
 195          end if;
 196
 197       --  Case of non-internal unit
 198
 199       else
 200          Ada_Version                 := Ada_Version_Config;
 201          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 202          Assertions_Enabled          := Assertions_Enabled_Config;
 203          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 204          Check_Float_Overflow        := Check_Float_Overflow_Config;
 205          Check_Policy_List           := Check_Policy_List_Config;
 206          Debug_Pragmas_Disabled      := Debug_Pragmas_Disabled_Config;
 207          Debug_Pragmas_Enabled       := Debug_Pragmas_Enabled_Config;
 208          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 209          Extensions_Allowed          := Extensions_Allowed_Config;
 210          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 211          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 212          Fast_Math                   := Fast_Math_Config;
 213          Initialize_Scalars          := Initialize_Scalars_Config;
 214          Optimize_Alignment          := Optimize_Alignment_Config;
 215          Optimize_Alignment_Local    := False;
 216          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 217          Use_VADS_Size               := Use_VADS_Size_Config;
 218
 219          --  Update consistently the value of Init_Or_Norm_Scalars. The value
 220          --  of Normalize_Scalars is not saved/restored because once set to
 221          --  True its value is never changed. That is, if a compilation unit
 222          --  has pragma Normalize_Scalars then it forces that value for all
 223          --  with'ed units.
 224
 225          Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 226       end if;
 227
 228       Default_Pool                   := Default_Pool_Config;
 229       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 230       Fast_Math                      := Fast_Math_Config;
 231       Optimize_Alignment             := Optimize_Alignment_Config;
 232       Polling_Required               := Polling_Required_Config;
 233       Short_Descriptors              := Short_Descriptors_Config;
 234    end Set_Opt_Config_Switches;
 235
 236    ---------------
 237    -- Tree_Read --
 238    ---------------
 239
 240    procedure Tree_Read is
 241       Tree_Version_String_Len         : Nat;
 242       Ada_Version_Config_Val          : Nat;
 243       Ada_Version_Explicit_Config_Val : Nat;
 244       Assertions_Enabled_Config_Val   : Nat;
 245
 246    begin
 247       Tree_Read_Int  (Tree_ASIS_Version_Number);
 248       Tree_Read_Bool (Brief_Output);
 249       Tree_Read_Bool (GNAT_Mode);
 250       Tree_Read_Char (Identifier_Character_Set);
 251       Tree_Read_Int  (Maximum_File_Name_Length);
 252       Tree_Read_Data (Suppress_Options'Address,
 253                       (Suppress_Options'Size + SU - 1) / SU);
 254       Tree_Read_Bool (Verbose_Mode);
 255       Tree_Read_Data (Warning_Mode'Address,
 256                       (Warning_Mode'Size + SU - 1) / SU);
 257       Tree_Read_Int  (Ada_Version_Config_Val);
 258       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 259       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 260       Tree_Read_Bool (All_Errors_Mode);
 261       Tree_Read_Bool (Assertions_Enabled);
 262       Tree_Read_Bool (Check_Float_Overflow);
 263       Tree_Read_Int  (Int (Check_Policy_List));
 264       Tree_Read_Bool (Debug_Pragmas_Disabled);
 265       Tree_Read_Bool (Debug_Pragmas_Enabled);
 266       Tree_Read_Int  (Int (Default_Pool));
 267       Tree_Read_Bool (Full_List);
 268
 269       Ada_Version_Config :=
 270         Ada_Version_Type'Val (Ada_Version_Config_Val);
 271       Ada_Version_Explicit_Config :=
 272         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 273       Assertions_Enabled_Config :=
 274         Boolean'Val (Assertions_Enabled_Config_Val);
 275
 276       --  Read version string: we have to get the length first
 277
 278       Tree_Read_Int (Tree_Version_String_Len);
 279
 280       declare
 281          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 282       begin
 283          Tree_Read_Data
 284            (Tmp'Address, Tree_Version_String_Len);
 285          System.Strings.Free (Tree_Version_String);
 286          Free (Tree_Version_String);
 287          Tree_Version_String := new String'(Tmp);
 288       end;
 289
 290       Tree_Read_Data (Distribution_Stub_Mode'Address,
 291                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 292       Tree_Read_Bool (Inline_Active);
 293       Tree_Read_Bool (Inline_Processing_Required);
 294       Tree_Read_Bool (List_Units);
 295       Tree_Read_Bool (Configurable_Run_Time_Mode);
 296       Tree_Read_Data (Operating_Mode'Address,
 297                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 298       Tree_Read_Bool (Suppress_Checks);
 299       Tree_Read_Bool (Try_Semantics);
 300       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 301                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 302       Tree_Read_Bool (Upper_Half_Encoding);
 303       Tree_Read_Bool (Force_ALI_Tree_File);
 304    end Tree_Read;
 305
 306    ----------------
 307    -- Tree_Write --
 308    ----------------
 309
 310    procedure Tree_Write is
 311       Version_String : String := Gnat_Version_String;
 312
 313    begin
 314       Tree_Write_Int  (ASIS_Version_Number);
 315       Tree_Write_Bool (Brief_Output);
 316       Tree_Write_Bool (GNAT_Mode);
 317       Tree_Write_Char (Identifier_Character_Set);
 318       Tree_Write_Int  (Maximum_File_Name_Length);
 319       Tree_Write_Data (Suppress_Options'Address,
 320                        (Suppress_Options'Size + SU - 1) / SU);
 321       Tree_Write_Bool (Verbose_Mode);
 322       Tree_Write_Data (Warning_Mode'Address,
 323                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 324       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 325       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 326       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 327       Tree_Write_Bool (All_Errors_Mode);
 328       Tree_Write_Bool (Assertions_Enabled);
 329       Tree_Write_Bool (Check_Float_Overflow);
 330       Tree_Write_Int  (Int (Check_Policy_List));
 331       Tree_Write_Bool (Debug_Pragmas_Disabled);
 332       Tree_Write_Bool (Debug_Pragmas_Enabled);
 333       Tree_Write_Int  (Int (Default_Pool));
 334       Tree_Write_Bool (Full_List);
 335       Tree_Write_Int  (Int (Version_String'Length));
 336       Tree_Write_Data (Version_String'Address, Version_String'Length);
 337       Tree_Write_Data (Distribution_Stub_Mode'Address,
 338                        (Distribution_Stub_Mode'Size + SU - 1) / SU);
 339       Tree_Write_Bool (Inline_Active);
 340       Tree_Write_Bool (Inline_Processing_Required);
 341       Tree_Write_Bool (List_Units);
 342       Tree_Write_Bool (Configurable_Run_Time_Mode);
 343       Tree_Write_Data (Operating_Mode'Address,
 344                        (Operating_Mode'Size + SU - 1) / SU);
 345       Tree_Write_Bool (Suppress_Checks);
 346       Tree_Write_Bool (Try_Semantics);
 347       Tree_Write_Data (Wide_Character_Encoding_Method'Address,
 348                        (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 349       Tree_Write_Bool (Upper_Half_Encoding);
 350       Tree_Write_Bool (Force_ALI_Tree_File);
 351    end Tree_Write;
 352
 353 end Opt;