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) 1992-2013, 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_Pragma_Config             := Ada_Version_Pragma;
  49       Ada_Version_Explicit_Config           := Ada_Version_Explicit;
  50       Assertions_Enabled_Config             := Assertions_Enabled;
  51       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  52       Check_Float_Overflow_Config           := Check_Float_Overflow;
  53       Check_Policy_List_Config              := Check_Policy_List;
  54       Default_Pool_Config                   := Default_Pool;
  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       Initialize_Scalars_Config             := Initialize_Scalars;
  62       Optimize_Alignment_Config             := Optimize_Alignment;
  63       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  64       Polling_Required_Config               := Polling_Required;
  65       Short_Descriptors_Config              := Short_Descriptors;
  66       SPARK_Mode_Config                     := SPARK_Mode;
  67       SPARK_Mode_Pragma_Config              := SPARK_Mode_Pragma;
  68       Use_VADS_Size_Config                  := Use_VADS_Size;
  69       Warnings_As_Errors_Count_Config       := Warnings_As_Errors_Count;
  70
  71       --  Reset the indication that Optimize_Alignment was set locally, since
  72       --  if we had a pragma in the config file, it would set this flag True,
  73       --  but that's not a local setting.
  74
  75       Optimize_Alignment_Local := False;
  76    end Register_Opt_Config_Switches;
  77
  78    ---------------------------------
  79    -- Restore_Opt_Config_Switches --
  80    ---------------------------------
  81
  82    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type) is
  83    begin
  84       Ada_Version                    := Save.Ada_Version;
  85       Ada_Version_Pragma             := Save.Ada_Version_Pragma;
  86       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
  87       Assertions_Enabled             := Save.Assertions_Enabled;
  88       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
  89       Check_Float_Overflow           := Save.Check_Float_Overflow;
  90       Check_Policy_List              := Save.Check_Policy_List;
  91       Default_Pool                   := Save.Default_Pool;
  92       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
  93       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
  94       Extensions_Allowed             := Save.Extensions_Allowed;
  95       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
  96       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
  97       Fast_Math                      := Save.Fast_Math;
  98       Initialize_Scalars             := Save.Initialize_Scalars;
  99       Optimize_Alignment             := Save.Optimize_Alignment;
 100       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
 101       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
 102       Polling_Required               := Save.Polling_Required;
 103       Short_Descriptors              := Save.Short_Descriptors;
 104       SPARK_Mode                     := Save.SPARK_Mode;
 105       SPARK_Mode_Pragma              := Save.SPARK_Mode_Pragma;
 106       Use_VADS_Size                  := Save.Use_VADS_Size;
 107       Warnings_As_Errors_Count       := Save.Warnings_As_Errors_Count;
 108
 109       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 110       --  Normalize_Scalars is not saved/restored because after set to True its
 111       --  value is never changed. That is, if a compilation unit has pragma
 112       --  Normalize_Scalars then it forces that value for all with'ed units.
 113
 114       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 115    end Restore_Opt_Config_Switches;
 116
 117    ------------------------------
 118    -- Save_Opt_Config_Switches --
 119    ------------------------------
 120
 121    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type) is
 122    begin
 123       Save.Ada_Version                    := Ada_Version;
 124       Save.Ada_Version_Pragma             := Ada_Version_Pragma;
 125       Save.Ada_Version_Explicit           := Ada_Version_Explicit;
 126       Save.Assertions_Enabled             := Assertions_Enabled;
 127       Save.Assume_No_Invalid_Values       := Assume_No_Invalid_Values;
 128       Save.Check_Float_Overflow           := Check_Float_Overflow;
 129       Save.Check_Policy_List              := Check_Policy_List;
 130       Save.Default_Pool                   := Default_Pool;
 131       Save.Dynamic_Elaboration_Checks     := Dynamic_Elaboration_Checks;
 132       Save.Exception_Locations_Suppressed := Exception_Locations_Suppressed;
 133       Save.Extensions_Allowed             := Extensions_Allowed;
 134       Save.External_Name_Exp_Casing       := External_Name_Exp_Casing;
 135       Save.External_Name_Imp_Casing       := External_Name_Imp_Casing;
 136       Save.Fast_Math                      := Fast_Math;
 137       Save.Initialize_Scalars             := Initialize_Scalars;
 138       Save.Optimize_Alignment             := Optimize_Alignment;
 139       Save.Optimize_Alignment_Local       := Optimize_Alignment_Local;
 140       Save.Persistent_BSS_Mode            := Persistent_BSS_Mode;
 141       Save.Polling_Required               := Polling_Required;
 142       Save.Short_Descriptors              := Short_Descriptors;
 143       Save.SPARK_Mode                     := SPARK_Mode;
 144       Save.SPARK_Mode_Pragma              := SPARK_Mode_Pragma;
 145       Save.Use_VADS_Size                  := Use_VADS_Size;
 146       Save.Warnings_As_Errors_Count       := Warnings_As_Errors_Count;
 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          Ada_Version_Pragma          := Empty;
 168          Dynamic_Elaboration_Checks  := False;
 169          Extensions_Allowed          := True;
 170          External_Name_Exp_Casing    := As_Is;
 171          External_Name_Imp_Casing    := Lowercase;
 172          Optimize_Alignment          := 'O';
 173          Persistent_BSS_Mode         := False;
 174          Use_VADS_Size               := False;
 175          Optimize_Alignment_Local    := True;
 176
 177          --  Note: we do not need to worry about Warnings_As_Errors_Count since
 178          --  we do not expect to get any warnings from compiling such a unit.
 179
 180          --  For an internal unit, assertions/debug pragmas are off unless this
 181          --  is the main unit and they were explicitly enabled. We also make
 182          --  sure we do not assume that values are necessarily valid and that
 183          --  SPARK_Mode is set to its configuration value.
 184
 185          if Main_Unit then
 186             Assertions_Enabled       := Assertions_Enabled_Config;
 187             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 188             Check_Policy_List        := Check_Policy_List_Config;
 189             SPARK_Mode               := SPARK_Mode_Config;
 190             SPARK_Mode_Pragma        := SPARK_Mode_Pragma_Config;
 191          else
 192             Assertions_Enabled       := False;
 193             Assume_No_Invalid_Values := False;
 194             Check_Policy_List        := Empty;
 195             SPARK_Mode               := None;
 196             SPARK_Mode_Pragma        := Empty;
 197          end if;
 198
 199       --  Case of non-internal unit
 200
 201       else
 202          Ada_Version                 := Ada_Version_Config;
 203          Ada_Version_Pragma          := Ada_Version_Pragma_Config;
 204          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 205          Assertions_Enabled          := Assertions_Enabled_Config;
 206          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 207          Check_Float_Overflow        := Check_Float_Overflow_Config;
 208          Check_Policy_List           := Check_Policy_List_Config;
 209          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 210          Extensions_Allowed          := Extensions_Allowed_Config;
 211          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 212          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 213          Fast_Math                   := Fast_Math_Config;
 214          Initialize_Scalars          := Initialize_Scalars_Config;
 215          Optimize_Alignment          := Optimize_Alignment_Config;
 216          Optimize_Alignment_Local    := False;
 217          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 218          SPARK_Mode                  := SPARK_Mode_Config;
 219          SPARK_Mode_Pragma           := SPARK_Mode_Pragma_Config;
 220          Use_VADS_Size               := Use_VADS_Size_Config;
 221          Warnings_As_Errors_Count    := Warnings_As_Errors_Count_Config;
 222
 223          --  Update consistently the value of Init_Or_Norm_Scalars. The value
 224          --  of Normalize_Scalars is not saved/restored because once set to
 225          --  True its value is never changed. That is, if a compilation unit
 226          --  has pragma Normalize_Scalars then it forces that value for all
 227          --  with'ed units.
 228
 229          Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 230       end if;
 231
 232       Default_Pool                   := Default_Pool_Config;
 233       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 234       Fast_Math                      := Fast_Math_Config;
 235       Optimize_Alignment             := Optimize_Alignment_Config;
 236       Polling_Required               := Polling_Required_Config;
 237       Short_Descriptors              := Short_Descriptors_Config;
 238    end Set_Opt_Config_Switches;
 239
 240    ---------------
 241    -- Tree_Read --
 242    ---------------
 243
 244    procedure Tree_Read is
 245       Tree_Version_String_Len         : Nat;
 246       Ada_Version_Config_Val          : Nat;
 247       Ada_Version_Explicit_Config_Val : Nat;
 248       Assertions_Enabled_Config_Val   : Nat;
 249
 250    begin
 251       Tree_Read_Int  (Tree_ASIS_Version_Number);
 252       Tree_Read_Bool (Brief_Output);
 253       Tree_Read_Bool (GNAT_Mode);
 254       Tree_Read_Char (Identifier_Character_Set);
 255       Tree_Read_Int  (Maximum_File_Name_Length);
 256       Tree_Read_Data (Suppress_Options'Address,
 257                       (Suppress_Options'Size + SU - 1) / SU);
 258       Tree_Read_Bool (Verbose_Mode);
 259       Tree_Read_Data (Warning_Mode'Address,
 260                       (Warning_Mode'Size + SU - 1) / SU);
 261       Tree_Read_Int  (Ada_Version_Config_Val);
 262       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 263       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 264       Tree_Read_Bool (All_Errors_Mode);
 265       Tree_Read_Bool (Assertions_Enabled);
 266       Tree_Read_Bool (Check_Float_Overflow);
 267       Tree_Read_Int  (Int (Check_Policy_List));
 268       Tree_Read_Int  (Int (Default_Pool));
 269       Tree_Read_Bool (Full_List);
 270
 271       Ada_Version_Config :=
 272         Ada_Version_Type'Val (Ada_Version_Config_Val);
 273       Ada_Version_Explicit_Config :=
 274         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 275       Assertions_Enabled_Config :=
 276         Boolean'Val (Assertions_Enabled_Config_Val);
 277
 278       --  Read version string: we have to get the length first
 279
 280       Tree_Read_Int (Tree_Version_String_Len);
 281
 282       declare
 283          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 284       begin
 285          Tree_Read_Data
 286            (Tmp'Address, Tree_Version_String_Len);
 287          System.Strings.Free (Tree_Version_String);
 288          Free (Tree_Version_String);
 289          Tree_Version_String := new String'(Tmp);
 290       end;
 291
 292       Tree_Read_Data (Distribution_Stub_Mode'Address,
 293                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 294       Tree_Read_Bool (Inline_Active);
 295       Tree_Read_Bool (Inline_Processing_Required);
 296       Tree_Read_Bool (List_Units);
 297       Tree_Read_Bool (Configurable_Run_Time_Mode);
 298       Tree_Read_Data (Operating_Mode'Address,
 299                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 300       Tree_Read_Bool (Suppress_Checks);
 301       Tree_Read_Bool (Try_Semantics);
 302       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 303                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 304       Tree_Read_Bool (Upper_Half_Encoding);
 305       Tree_Read_Bool (Force_ALI_Tree_File);
 306    end Tree_Read;
 307
 308    ----------------
 309    -- Tree_Write --
 310    ----------------
 311
 312    procedure Tree_Write is
 313       Version_String : String := Gnat_Version_String;
 314
 315    begin
 316       Tree_Write_Int  (ASIS_Version_Number);
 317       Tree_Write_Bool (Brief_Output);
 318       Tree_Write_Bool (GNAT_Mode);
 319       Tree_Write_Char (Identifier_Character_Set);
 320       Tree_Write_Int  (Maximum_File_Name_Length);
 321       Tree_Write_Data (Suppress_Options'Address,
 322                        (Suppress_Options'Size + SU - 1) / SU);
 323       Tree_Write_Bool (Verbose_Mode);
 324       Tree_Write_Data (Warning_Mode'Address,
 325                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 326       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 327       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 328       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 329       Tree_Write_Bool (All_Errors_Mode);
 330       Tree_Write_Bool (Assertions_Enabled);
 331       Tree_Write_Bool (Check_Float_Overflow);
 332       Tree_Write_Int  (Int (Check_Policy_List));
 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;